Bi-directional light emitting diode drive circuit in bi-directional power parallel resonance

• US 8,063,587 B2
• Filed: 01/12/2009
• Issued: 11/22/2011
• Est. Priority Date: 01/14/2008
• Status: Expired due to Fees

• Current Assignee: Tai-Her Yang
• Original Assignee: Tai-Her Yang
• Inventors: Yang, Tai-Her
• Primary Examiner(s): Ismail; Shawki S
• Assistant Examiner(s): Hammond; Crystal L
• Application Number:
  US12/351,921
• Publication Number:
  US 20090179594A1
• Time in Patent Office: 1,044 Days
• Field of Search: 315/246, 315/248, 315/250, 315/258, 315/283, 315/290, 315/291, 315/297, 315/307, 315/227.R, 315/228, 315/239, 315/244, 315/276
• US Class Current: 315/307
• CPC Class Codes: H05B 45/37 Converter circuits

Abstract

The present invention uses the capacitive, or inductive, or resistive impedance component to constitute the first impedance, and the parallel connected capacitive and the inductive impedance components in parallel resonance to constitute the second impedance; and is characterized as that the first impedance and the second impedance in series connection is configured for inputting bi-directional power, thereby dividing its power source voltage to drive the bi-directional conducting light emitting diode.

Claims

1. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance, in which the bi-directional light emitting diode drive circuit (U100) includes at least one capacitive impedance component, or inductive impedance component or resistive impedance component to constitute at least one first impedance;

at least one capacitive impedance component and at least one inductive impedance component are in parallel connection to constitute a second impedance, wherein the inherent parallel resonance frequency of the second impedance is the same as the frequency or period of the bi-directional power, thereby to produce a parallel resonance status;

the first impedance and the second impedance are in mutual series connection to receive the following bi-directional powers which includes the following;

1) the AC power with a constant or variable voltage and a constant or variable frequency;

or

2) the AC power of bi-directional sinusoidal wave voltage or bi-directional square wave voltage, or bi-directional pulse wave voltage with constant or variable voltage and constant or variable frequency or period which is converted from a DC power source;

or

3) the AC power of bi-directional sinusoidal wave voltage or bi-directional square wave voltage, or bi-directional pulse wave voltage with constant or variable voltage and constant or variable frequency or period converted from the DC power which is further rectified from an AC power;

wherein a bi-directional conducting light emitting diode set (L100) which includes at least one first light emitting diode (LED101) and at least one second light emitting diode (LED102) in parallel connection of opposite polarities, wherein the number of the first light emitting diode (LED101) and the second light emitting diode (LED102) can be the same or different, further, the first light emitting diode (LED101) and the second light emitting diode (LED102) is configured to individually include a forward current polarity light emitting diode;

or two or more than two forward current polarity light emitting diodes in series or parallel connections;

or three or more than three forward current polarity light emitting diodes in series or parallel connections or in series and parallel connections;

the bi-directional conducting light emitting diode set (L100) is configured to be installed with one or more than one sets as needed, wherein it is parallel connected across the two ends of both or either of the first impedance (Z101) or the second impedance (Z102) to form the divided power at the two ends of the first impedance (Z101) and the second impedance (Z102) respectively by the power input, to drive the bi-directional conducting light emitting diode set (L100) to emit light, thus to constitute the bi-directional light emitting diode drive circuit in bi-directional power parallel resonance of the present invention;

wherein;

the first impedance (Z101) includes;

1) the first impedance (Z101) includes at least one capacitor (C100) or at least one inductive impedance component or at least one resistive impedance component, or one kind or more than one kind and one or more than one said impedance components, or by two or more than two kinds of impedance components, wherein the impedance components are respectively one or more than one in series connection or parallel connection, or series and parallel connection, to provide DC or AC impedances;

or

2) the first impedance (Z101) includes at least one capacitive impedance component and at least one inductive impedance component in mutual series connection, wherein their inherent series resonance frequency after series connection is the same as the frequency of bi-directional power source such as the frequency of an AC power, or the alternated polarity period of the constant or variable periodically alternated polarity power converted from the DC power, thereby to produce a series resonance status;

or

3) the first impedance (Z101) includes at least one capacitive impedance component and at least one inductive impedance component in mutual parallel connection, wherein the inherent parallel resonance frequency after parallel connection is the same as the frequency of bi-directional power source such as the frequency of an AC power, or the alternated polarity period of the constant or variable periodically alternated polarity power converted from the DC power, thereby to produce a low energy consuming alternated polarity power storage status at parallel resonance frequency and to appear a divided end voltage status corresponding to the second impedance;

the second impedance (Z102) includes;

at least one inductive impedance component (I200) and at least one capacitor (C200) in parallel connection, wherein its frequency is the same as the frequency of the bi-directional power source such as the frequency of an AC power, or the alternated polarity period of the constant or variable voltage and the constant or variable periodically alternated polarity power converted from a DC power to appear in a parallel resonance status, thereby to present a divided end voltage status corresponding to the first impedance;

at least one of the three kinds of the capacitive impedance components, inductive impedance components or resistive impedance components is configured to be selected as needed to constitute the first impedance (Z101) in the bi-directional light emitting diode drive circuit in bi-directional power parallel resonance;

the first impedance (Z101) and the second impedance (Z102) are in mutual series connection, wherein the two ends of the first impedance (Z101) and the second impedance (Z102) in mutual series connection are provided to receive the following bi-directional powers;

1) the AC power with a constant or variable voltage and a constant or variable frequency;

or

2) the AC power of bi-directional sinusoidal wave voltage or bi-directional square wave voltage, or bi-directional pulse wave voltage with constant or variable voltage and constant or variable frequency or period which is converted from a DC power source;

or

3) the AC power of bi-directional sinusoidal wave voltage or bi-directional square wave voltage, or bi-directional pulse wave voltage with constant or variable voltage and constant or variable frequency or period converted from the DC power which is further rectified from an AC power;

a bi-directional conducting light emitting diode set (L100) includes at least one first light emitting diode (LED101) and at least one second light emitting diode (LED102) in parallel connection of opposite polarities, wherein the number of first light emitting diodes (LED101) and the number of second light emitting diodes (LED102) can be the same or different, and the first light emitting diode (LED101) and the second light emitting diode (LED102) are individually constituted by a forward current polarity light emitting diode, or by two or more than two forward current polarity light emitting diodes in series connection or parallel connection, or by three or more than three forward current polarity light emitting diodes in series connection, parallel connection or series and parallel connection;

at least one set of the bi-directional conducting light emitting diode set (L100) is configured to be selected as needed to be parallel connected across the two ends of both or either of the first impedance (Z101) or the second impedance (Z102), wherein the divided power is formed across the two ends of first impedance (Z101) and the two ends of second impedance (Z102) by means of power input, to drive the bi-directional conducting light emitting diode set (L100) which is parallel connected across the two ends of the first impedance (Z101) or the two ends of the second impedance (Z102) to emit light;

the bi-directional light emitting diode drive circuit (U100) in the bi-directional light emitting diode drive circuit in bi-directional power parallel resonance of the present invention, in which the first impedance (Z101) and the second impedance (Z102) as well as the bi-directional conducting light emitting diode set (L100) can be selected to be one or more than one as needed;

the first impedance (Z101), the second impedance (Z102) and the bi-directional conducting light emitting diode set (L100) as well as the first light emitting diode (LED101), the second light emitting diode (LED102) and various optional auxiliary circuit components are based on application needs, wherein they is configured to be installed or not installed as needed and the installation quantity include constitution by one, wherein if more than one are selected, the corresponding polarity relationship shall be determined based on circuit function requirement to execute series connection, or parallel connection or series and parallel connections.

2. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein:

the first impedance (Z101) includes at least one capacitor (C100) with especially referring to a bipolar capacitor, wherein the number of the first impedances can be one or more than one;

the second impedance (Z102) includes at least one inductive impedance component (I200) and at least one capacitor (C200) in parallel connection with especially referring to be constituted by an inductive impedance component and a bipolar capacitor, so that its frequency is the same as the frequency of the bi-directional power such as the frequency of an AC power, or the alternated polarity period of the constant or variable voltage and the constant or variable periodically alternated polarity power converted from a DC power to appear in a parallel resonance status;

further, the number of the second impedances can be one or more than one;

the first impedance (Z101) and the second impedance (Z102) are in series connection while the two ends of the said series connection is provided with a bi-directional power input, thereby to form a divided power in parallel resonance at the second impedance (Z102), and at least one bi-directional conducting light emitting diode set (L100) is driven by the said divided power;

the bi-directional conducting light emitting diode set (L100) includes at least one first light emitting diode (LED101) and at least one second light emitting diode (LED102) in parallel connection of opposite polarities, wherein the number of the first light emitting diode (LED101) and the number of the second light emitting diode (LED102) can be the same or different, further, the first light emitting diode (LED101) and the second light emitting diode (LED102) can be individually constituted by a forward current polarity light emitting diode;

or two or more than two forward current polarity light emitting diodes in series or parallel connections;

or three or more than three forward current polarity light emitting diodes in series or parallel connections or in series and parallel connections;

the bi-directional conducting light emitting diode set (L100) is configured to be installed with one or more than one sets as needed, wherein it is parallel connected across the two ends of both or either the first impedance (Z101) or the second impedance (Z102) to form the divided power which is used to drive the bi-directional conducting light emitting diode set (L100) to emit light;

or

the bi-directional conducting light emitting diode set (L100) is parallel connected across the two ends of at least one second impedance (Z102), to be driven by the divided power across the two ends of the second impedance (Z102) which is in parallel resonance with the bi-directional power period, while the impedance of the first impedance (Z101) is used to limit its current and in case that the capacitor (C100) (such as a bipolar capacitor) is used as the first impedance component, the output current is then limited by the capacitive impedance;

the first impedance (Z101), the second impedance (Z102) and the bi-directional conducting light emitting diode set (L100) are connected according to the aforesaid circuit structure to constitute the bi-directional light emitting diode drive circuit (U100).

3. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein by means of the current distribution effect formed by the parallel connection of the bi-directional conducting light emitting diode set (L100) and the second impedance (Z102), the voltage variation rate across the two ends of the bi-directional conducting light emitting diode set (L100) corresponding to power source voltage variation can be reduced.

4. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein the first impedance (Z101) can also be selected not to use, instead of that, the second impedance (Z102) which is in parallel resonance with the bi-directional power from power source is directly parallel connected with the power source of bi-directional power.

5. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein either the first light emitting diode (LED101) or the second light emitting diode (LED102) can be replaced by a diode (CR100), wherein the current direction of the said (CR100) and the working current direction of either the first light emitting diode (LED101) or the second light emitting diode (LED102) which is reserved for parallel connection are in parallel connection of opposite polarities.

6. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein if the first light emitting diode (LED101) and the second light emitting diode (LED102) constituting the bi-directional conducting light emitting diode set (L100) are simultaneously installed with the current limit resistors (R103) and (R104), the bi-directional conducting light emitting diode set (L100) can be replaced by or installed together with a current limit resistor (R100) to obtain the current limit function, wherein the current limit resistor (R100) can also be replaced by an inductive impedance component (I100);

the bi-directional light emitting diode drive circuit (U100) is thus constituted by the said circuit structure and selection of auxiliary circuit components.

7. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein a zener diode can be further parallel connected across the two ends of the first light emitting diode (LED101) and the second light emitting diode (LED102) in the bi-directional conducting light emitting diode set (L100), or the zener diode is first series connected with at least one diode to produce a zener voltage function, then parallel connected across the two ends of the first light emitting diode (LED101) or of the second light emitting diode (LED102);

wherein;

a zener diode (ZD101) is parallel connected across the two ends of the first light emitting diode (LED101) of the bi-directional conducting light emitting diode set (L100), wherein its polarity relationship is that the zener voltage of the zener diode (ZD101) is used to limit the working voltage across the two ends of the first light emitting diode (LED101);

said zener diode (ZD101) is configured to be series connected with a diode (CR201) as needed, wherein the advantages are

     1) the zener diode (ZD101) can be protected from reverse current;

     2) both diode (CR201) and zener diode (ZD101) have temperature compensation effects;

if the second light emitting diode (LED102) is selected to consitute the bi-directional conducting light emitting diode set (L100), a zener diode (ZD102) can be selected to parallel connect across the two ends of the second light emitting diode (LED102), wherein their polarity relationship is that the zener voltage of the zener diode (ZD102) is used to limit the working voltage across the two ends of the second light emitting diode (LED102);

said zener diode (ZD102) is configured to be series connected with a diode (CR202) as needed, wherein the advantages are

     1) the zener diode (ZD102) can be protected from reverse current;

     2) both diode (CR202) and zener diode (ZD102) have temperature compensation effects.

8. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein if the bi-directional conducting light emitting diode set (L100) in the bi-directional light emitting diode drive circuit (U100) is selected to be constituted by the first light emitting diode (LED101) and the second light emitting diode (LED102) in parallel connection of opposite polarities, its constitutions include the following:

a zener diode (ZD101) is configured to be parallel connected as needed across the two ends of the first light emitting diode (LED101) or a zener diode (ZD102) is configured to be parallel connected as needed across the two ends of the second light emitting diode (LED102), wherein their polarity relationships are that the zener voltage of the zener diode (ZD101) is used to limit the working voltage across the two ends of the first light emitting diode (LED101), and the zener voltage of the zener diode (ZD102) is used to limit the working voltage across the two ends of the second light emitting diode (LED102).

9. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein the zener diode includes the following:

1) a zener diode (ZD101) is parallel connected across the two ends of the first light emitting diode (LED101) of the bi-directional conducting light emitting diode set (L100), and a zener diode (ZD102) is parallel connected across the two ends of the second light emitting diode (LED102);

or

2) the two zener diodes (ZD101) and (ZD102) are reversely series connected and are further parallel connected across the two ends of the bi-directional conducting light emitting diode set (L100);

or

3) it can be replaced by parallel connecting a diode with bi-directional zener effect in the circuit of bi-directional conducting light emitting diode set (L100).

10. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein the first light emitting diode (LED101) can be installed with a charge/discharge device (ESD101), or the second light emitting diode (LED102) can be installed with a charge/discharge device (ESD102), wherein the charge/discharge device (ESD101) and the charge/discharge device (ESD102) have the random charging or discharging characteristics which can stabilize the lighting stability of the first light emitting diode (LED101) and the second light emitting diode (LED102), to reduce their lighting pulsations;

the aforesaid charge/discharge devices (ESD101), (ESD102) can be constituted by the conventional charging and discharging batteries, or super-capacitors or capacitors.

11. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein the application circuit with additionally installed charge/discharge device includes a charge/discharge device (ESD101) can be parallel connected across the two ends of the current limit resistor (R103) and the first light emitting diode (LED101) in series connection;

or a charge/discharge device (ESD102) can be further parallel connected across the two ends of the current limit resistor (R104) and the second light emitting diode (LED102) in series connection.

12. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein the constitution of the application circuit with a charge/discharge device parallel connected across the two ends of the first and second light emitting diodes and the current limit resistor in series connection includes:

a charge/discharge device (ESD101) based on its polarity is parallel connected across the two ends of the first light emitting diode (LED101) and the current limit resistor (R103) in series connection, or is directly parallel connected across the two ends of the first light emitting diode (LED101), wherein the charge/discharge device (ESD101) has the random charge/discharge characteristics to stabilize the lighting operation and to reduce the lighting pulsation of the first light emitting diode (LED101);

if the second light emitting diode (LED102) is selected to use, a charge/discharge device (ESD102) based on its polarity is parallel connected across the two ends of the second light emitting diode (LED102) and the current limit resistor (R104) in series connection, wherein the charge/discharge device (ESD102) has the random charge/discharge characteristics to stabilize the lighting operation and to reduce the lighting pulsation of the second light emitting diode (LED102);

if a first light emitting diode (LED101) is selected and is reversely parallel connected with a diode (CR100) in the bi-directional light emitting diode drive circuit (U100), then its main circuit structure is that a charge/discharge device (ESD101) based on its polarity is parallel connected across the two ends of the first light emitting diode (LED101) and the current limit resistor (R103) in series connection, wherein the charge/discharge device (ESD101) has the random charge/discharge characteristics to stabilize the lighting operation and to reduce the lighting pulsation of the first light emitting diode (LED101);

the aforesaid charge/discharge devices (ESD101), (ESD102) can be constituted by the conventional charging and discharging batteries, or super-capacitors or capacitors.

13. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein in the bi-directional light emitting diode drive circuit (U100), when the current limit resistor (R100) is selected to replace the current limit resistors (R103), (R104) to serve as the common current limit resistor of the bi-directional conducting light emitting diode set (L100) in the light emitting diode drive circuit (U100), the main circuit structure includes:

a charge/discharge device (ESD101) is directly parallel connected across the two ends of the first light emitting diode (LED101) of the same polarity, and a charge/discharge device (ESD102) is directly parallel connected across the two ends of the first light emitting diode (LED102) of the same polarity, wherein the charge/discharge devices (ESD101) and (ESD102) has the random charge or discharge characteristics;

the aforesaid charge/discharge devices (ESD101), (ESD102) can be constituted by the conventional charging and discharging batteries, or super-capacitors or capacitors.

14. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein a charge/discharge device can be further installed across the two ends of the bi-directional conducting light emitting diode set (L100) for random charging/discharging, thereby besides of stabilizing the lighting stabilities of the first light emitting diode (LED101) and the second light emitting diode (LED102) of the bi-directional conducting light emitting diode set (L100), the charge/discharge device can provide its saving power during a power off to drive at least one of the first light emitting diode (LED101)or the second light emitting diode (LED102) to continue emitting light;

if the charge/discharge devices (ESD101) or (ESD102) used is uni-polar, after the first light emitting diode (LED101) is parallel connected with the uni-polar charge/discharge device (ESD101), a diode (CR101) of forward polarity series connection is configured to be installed as needed to prevent reverse voltage from damaging the uni-polar charge/discharge device;

wherein after the second light emitting diode (LED102) is parallel connected with the uni-polar charge/discharge device (ESD102), a diode (CR102) of forward polarity series connection is configured to be installed as needed to prevent reverse voltage from damaging the uni-polar charge/discharge device;

the aforesaid charge/discharge devices (ESD101), (ESD102) can be constituted by the conventional charging and discharging batteries, or super-capacitors or capacitors.

15. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein the bi-directional conducting light emitting diode set (L100), in which the lighting functions of the said bi-directional light emitting diodes are constituted by that a diode (CR101) is parallel connected with at least one first light emitting diode (LED101) in opposite polarities, and a diode (CR102) is parallel connected with at least one second light emitting diode (LED102) in opposite polarities, wherein the two are further reversely series connected to constitute a bi-directional conducting light emitting diode set.

16. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein in the bi-directional light emitting diode drive circuit (U100), it is configured to be installed with one bi-directional conducting light emitting diode set (L100), or more than one set of the bi-directional conducting light emitting diode sets (L100) in series connection, parallel connection or in series and parallel connection, wherein if one set or more than one sets are selected to be installed, they can be driven together by the divided power at a common second impedance (Z102) or driven individually by the corresponding divided power at each of the multiple second impedances (Z102) which are in series connection or parallel connection.

17. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein if the charge/discharge device is not installed, then current conduction to light emitting diode is intermittent, referring to the input voltage wave shape and duty cycle of current conduction, the light emitting forward current and the peak of light emitting forward voltage of each light emitting diode in the bi-directional conducting light emitting diode set (L100) can be correspondingly selected for the light emitting diodes;

if current conduction to light emitting diode is intermittent, the peak of light emitting forward voltage can be correspondingly selected based on the duty cycle of current conduction as long as the principle of that the peak of light emitting forward voltage does not damage the light emitting diode is followed.

18. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein if the charge/discharge device is not installed, then based on the value and wave shape of the aforesaid light emitting forward voltage, the corresponding current value and wave shape from the forward voltage vs. forward current ratio are produced;

however the peak of light emitting forward current shall follow the principle not to damage the light emitting diode.

19. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein it is series connected to the bi-directional power modulator of series connection type, wherein the bi-directional power modulator of series connection type includes the following:

A bi-directional power modulator of series connection type (300) including conventional electromechanical components or solid state power components and related electronic circuit components to modulate the bi-directional power output;

the circuit operating functions are the following;

1) the bi-directional power modulator of series connection type (300) is series connected with the bi-directional light emitting diode drive circuit (U100) to receive the bi-directional power from power source, the bi-directional power is modulated by the bi-directional power modulator of series connection type (300) to execute power modulations such as pulse width modulation or current conduction phase angle control, or impedance modulation to drive the bi-directional light emitting diode drive circuit (U100);

or

2) the bi-directional power modulator of series connection type (300) is series connected between the second impedance (Z102) and the bi-directional conducting light emitting diode set (L100) whereby the bi-directional divided power in parallel resonance across the two ends of the second impedance (Z102) is modulated by the bi-directional power modulator of series connection type (300) to execute power modulations such as pulse width modulation or current conduction phase angle control, or impedance modulation to drive the bi-directional conducting light emitting diode set (L100).

20. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein it is parallel connected to a bi-directional power modulator of parallel connection type, wherein the bi-directional power modulator of parallel connection type includes the following:

a bi-directional power modulator of parallel connection type (400) including conventional electromechanical components or solid state power components and related electronic circuit components to modulate the bi-directional power output;

the circuit operating functions are the following;

1) the bi-directional power modulator of parallel connection type (400) is installed, wherein its output ends are for parallel connection with the bi-directional light emitting diode drive circuit (U100), while its input ends are provided for receiving the bi-directional power from the power source, the bi-directional power is modulated by the bi-directional power modulator of parallel connection type (400) to execute power modulations such as pulse width modulation or current conduction phase angle control, or impedance modulation to drive the bi-directional light emitting diode drive circuit (U100);

or

2) the bi-directional power modulator of parallel connection type (400) is installed, wherein its output ends are parallel connected with the input ends of the bi-directional conducting light emitting diode set (L100) while its input ends are parallel connected with the second impedance (Z102), the bi-direction divided power in parallel resonance across the two ends of the second impedance (Z102) is modulated by the bi-directional power modulator of parallel connection type (400) to execute power modulations such as pulse width modulation or current conduction phase angle control, or impedance modulation to drive the bi-directional conducting light emitting diode set (L100).

21. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein it is driven by a DC to AC inverter output power;

wherein;

a DC to AC Inverter (4000) includes conventional electromechanical components or solid state power components and related electronic circuit components, wherein its input ends are optionally provided as needed to receive input from a constant or variable voltage DC power, or a DC power rectified from an AC power, while its output ends are optionally selected as needed to supply bi-directional AC power of bi-directional sinusoidal wave, or bi-directional square wave or bi-directional pulse wave in a constant or variable voltage and constant or variable alternated polarity frequency or periods to be used as the power source to supply bi-directional power;

the circuit operating functions are the following;

the bi-directional light emitting diode drive circuit (U100) is parallel connected across the output ends of the conventional DC to AC inverter (4000);

the input ends of the DC to AC inverter (4000) are optionally provided as needed to receive input from a constant or variable voltage DC power, or a DC power rectified from an AC power;

the output ends of the DC to AC inverter (4000) is configured to be selected as needed to provide power of bi-directional sinusoidal wave, or bi-directional square wave, or bi-directional pulse wave in a constant or variable voltage and constant or variable alternated period, wherein it can be further supplied to the two ends of the first impedance (Z101) and the second impedance (Z102) of the bi-directional light emitting diode drive circuit (U100) in series connection, wherein the divided power across the two ends of the second impedance (Z102) is then used to transmit to the bi-directional conducting light emitting diode set (L100);

in addition, the bi-directional light emitting diode drive circuit (U100) can be controlled and driven by means of modulating the output power from the DC to AC inverter (4000), as well as by executing power modulations to the power outputted such as pulse width modulation, or conductive current phase angle control, or impedance modulation.

22. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein the bi-directional light emitting diode drive circuit (U100) which is arranged to be series connected with at least one conventional impedance component (500) and further to be parallel connected with the power source, wherein the impedance (500) includes:

1) a component with resistive impedance characteristics;

or

2) a component with inductive impedance characteristics;

or

3) a component with capacitive impedance characteristics;

or

4) a single impedance component with the combined impedance characteristics of at least two of the resistive impedance, or inductive impedance, or capacitive impedance simultaneously, thereby to provide DC or AC impedances;

or

5) a single impedance component with the combined impedance characteristics of inductive impedance and capacitive impedance, wherein its inherent parallel resonance frequency is the same as the frequency or period of bi-directional power from power source, thereby to produce a parallel resonance status;

or

6) one kind or more than one kind of one or more than ones capacitive impedance component, or inductive impedance component, or resistive impedance component or by two kinds or more than two kinds of impedance components in series connection, or parallel connection, or series and parallel connection so as to provide DC or AC impedances;

or

7) the mutual series connection of a capacitive impedance component and an inductive impedance component, wherein its inherent series resonance frequency is the same as the frequency or period of bi-directional power from power source to produce a series resonance status and the end voltage across two ends of the capacitive impedance component or the inductive impedance component appear in series resonance correspondingly;

or the capacitive impedance and the inductive impedance are in mutual parallel connection, its inherent parallel resonance frequency is the same as the frequency or period of bi-directional power from power source, thereby to produce a parallel resonance status and appear the corresponding end voltage.

23. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein the optionally installed inductive impedance component (I200) of the second impedance (Z102) can be further replaced by the power supply side winding of a transformer with inductive effect, wherein the self-coupled transformer (ST200) has a self-coupled voltage change winding (WO) with voltage raising function, the b, c ends of the self-coupled voltage change winding (WO) of the self-coupled transformer (ST200) are the power supply side which replace the inductive impedance component (I200) of the second impedance (Z102) to be parallel connected with the capacitor (C200), wherein its inherent parallel resonance frequency after parallel connection is the same as the frequency of the bi-directional power source such as the frequency of an Ac power, or the alternated polarity period of the constant or variable voltage and the constant or variable periodically alternated polarity power converted from a DC power to appear in a parallel resonance status, thereby to constitute the second impedance (Z102) which is series connected with the capacitor (C100) of the first impedance (Z101), further, the capacitor (C200) is configured to be parallel connected with the a, c taps or b, c taps of the self-coupled transformer (ST200), or other selected taps as needed, wherein the a, c output ends of the self-coupled voltage change winding (WO) of the self-coupled transformer (ST200) are arranged to provide AC power of voltage rise to drive the bi-directional conducting light emitting diode set (L100).

24. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein the optionally installed inductive impedance component (I200) of the second impedance (Z102) can be further replaced by the power supply side winding of a transformer with inductive effect, wherein the self-coupled transformer (ST200) has a self-coupled voltage change winding (W0) with voltage drop function, in which the b, c ends of the self-coupled voltage change winding (W0) of the self-coupled transformer (ST200) are the power supply side which replace the inductive impedance component (I200) of the second impedance (Z102) to be parallel connected with the capacitor (C200), wherein its parallel resonance frequency after parallel connection is the same as the frequency of the bi-directional power source such as the frequency of an AC power, or the alternated polarity period of the constant or variable voltage and the constant or variable periodically alternated polarity power converted from a DC power to appear in a parallel resonance status, thereby to constitute the second impedance (Z102), which is series connected with the capacitor (C100) of the first impedance (Z101), further, the capacitor (C200) is configured to be parallel connected with the a, c taps or b, c taps of the self-coupled transformer (ST200), or other selected taps as needed, wherein the a, c output ends of the self-coupled voltage change winding (W0) of the self-coupled transformer (ST200) are arranged to provide AC power of voltage drop to drive the bi-directional conducting light emitting diode set (L100).

25. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance as claimed in claim 1, wherein the optionally installed inductive impedance component (I200) of the second impedance (Z102) can be further replaced by the power supply side winding of a transformer with inductive effect, wherein the separating type transformer (IT200) is comprised of a primary side winding (W1) and a secondary side winding (W2), in which the primary side winding (W1) and the secondary side winding (W2) are separated, while the primary side winding (W1) is parallel connected with the capacitor (C200), wherein their inherent parallel resonance frequency after parallel connection is the same as the frequency of the bi-directional power source such as the frequency of an AC power, or the alternated polarity period of the constant or variable voltage and the constant or variable periodically alternated polarity power converted from a DC power to appear in a parallel resonance status, thereby to constitute the second impedance (Z102) which is series connected with the capacitor (C100) of the first impedance (Z101), and the capacitor (C200) is configured to be parallel connected with the a, c taps or b, c taps of the self-coupled transformer (ST200), or other selected taps as needed;

the output voltage of the secondary side winding (W2) of the separating type transformer (IT200) is configured to be selected as needed to provide AC power of voltage rise or voltage drop to drive the bi-directional conducting light emitting diode set (L100);

the inductive impedance component (I200) of the second impedance (Z102) is replaced by the power supply side winding of the transformer and is parallel connected with the capacitor (C200) to appear parallel resonance, thereby to constitute the second impedance (Z102), while the secondary side of the separating type transformer (IT200) provides AC power of voltage rise or voltage drop to drive the bi-directional conducting light emitting diode set (L100).