BI-DIRECTIONAL LIGHT EMITTING DIODE DRIVE CIRCUIT IN PULSED POWER PARALLEL RESONANCE

• US 20090179590A1
• Filed: 01/12/2009
• Published: 07/16/2009
• Est. Priority Date: 01/14/2008
• Status: Active Grant

• Current Assignee: Tai-Her Yang
• Original Assignee: Tai-Her Yang
• Inventors: Yang, Tai-Her
• Granted Patent: US 8,067,901 B2
• Time in Patent Office: Days
• US Class Current: 315/297
• CPC Class Codes: H05B 45/37 Converter circuits
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The present invention is characterized by using capacitive, inductive or resistive impedance to constitute the first impedance which is series connected with the second impedance constituted by parallel connecting the capacitive and inductive impedances that appears parallel resonance with the pulsed period to receive pulsed power, thereby to form a divided bidirectional power at the two ends of the first and second impedances, so as toe drive the bidirectional conducting light emitting diode.

Claims

1. A bi-directional light emitting diode drive circuit in pulsed power parallel resonance, in which the circuit function and operation of the bi-directional light emitting diode drive circuit (U100) is mainly comprised of at least one first impedance which is constituted by at least one capacitive or inductive or resistive impedance component;

a second impedance which is constituted by at least one capacitive impedance and at least one inductive component in parallel connection, whereof its inherent parallel resonance frequency is the same as the pulse period of the pulsed power to appear parallel resonance status; and

at least one bi-directional conducting light emitting diode set which is constituted by at least one first light emitting diode and at least one second light emitting diode in parallel connection of reverse polarities, whereof it is parallel connected with the two ends of the at least one second impedance while the two ends of at least one first impedance and at least one second impedance in series connection receive pulsed power input to form divided voltage across the two ends of the first impedance and second impedance respectively, whereof the divided power drives at least one bi-directional conducting light emitting diode set, thereby to constitute the bi-directional light emitting diode drive circuit in pulsed power parallel resonance;

whereof it is comprised of that;

The first impedance (Z101), which includes;

1) It is constituted by a capacitor (C100) or an inductive impedance component or a resistive impedance component, or one kind or more than one kind and one or more than one impedance components, or two kinds or more than two kinds of impedance components, whereof 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) At least one capacitive impedance component and at least one inductive impedance component are mutually series connected to have the same pulse period as pulsed power source to appear series resonance status, or the at least one capacitive impedance component and the at least one inductive impedance component can be mutually parallel connected to appear parallel resonance with the pulse period of the pulsed power source;

The second impedance (Z102) includes to be constituted by at least one inductive impedance component (I200) and at least one capacitor (C200) in parallel connection to have the same pulse period as the pulsed power to appear corresponding impedance parallel resonance status and end voltage status;

At least one first impedance (Z101) and at least one second impedance (Z102) are mutually series connected, whereof the two ends of the series connected first impedance (Z101) and the second impedance (Z102) are for inputting;

1) DC pulsed power;

or

2) The DC pulsed power with constant or variable voltage and constant or variable periods converted from DC power source;

or

3) The DC pulsed power with constant or variable voltage and constant or variable periods converted from DC power which is further rectified from AC power;

or

4) The half-wave or full-wave DC pulsed power rectified from constant or variable AC power with constant or variable voltage and constant or variable frequency;

A bi-directional conducting light emitting diode set (L100);

it is constituted by at least one first light emitting diode (LED101) and at least one second light emitting diode (LED102) in parallel connection of inverse polarities, whereof the numbers of the first light emitting diode (LED101) and the numbers 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 respectively constituted by one 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) can be optionally installed with one or more than one sets as needed, whereof it is parallel connected across the two ends of both or either of the first impedance (Z101) or the second impedance (Z102) to form divided power at two ends of both the first impedance (Z101) and the second impedance (Z102) by the power input, thereby to drive the bi-directional conducting light emitting diode set (L100) to emit light;

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

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

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

A first impedance (Z101);

it is constituted by a capacitor (C100) with especially referring to a bipolar capacitor at the quantity of one or more than ones, or the first impedance (Z101) can be optionally selected not to use as needed;

A second impedance (Z102);

It is constituted by at least one inductive component (I200) and at least one capacitor (C200) in parallel connection with specially referring to the constitution by an inductive impedance component and a bipolar capacitor, whereof its pulse period is the same as that of the pulsed power to appear parallel resonance status, whereof the quantity of the second impedance is one or more than ones;

At least one first impedance (Z101) and at least one second impedance (Z102) are in series connection while the two ends of the said series connection is for receiving the pulsed power input, thereby to form divided power at the second impedance (Z102) in parallel resonance, whereof the divided power drives at least one bi-directional conducting light emitting diode set (L100);

A bi-directional conducting light emitting diode set (L100);

it is constituted by at least one first light emitting diode (LED101) and at least one second light emitting diode (LED102) in parallel connection of inverse polarities, whereof the numbers of the first light emitting diode (LED101) and the numbers 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 respectively constituted by one 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) can be optionally installed with one or more than one sets as needed, whereof it is parallel connected across the two ends of both or either of the first impedance (Z101) or the second impedance (Z102) to form divided power at two ends of both the first impedance (Z101) and the second impedance (Z102) by the power input, thereby 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 second impedance (Z102) to emit light;

or

At least one bi-directional conducting light emitting diode set (L100) is parallel connected to the two ends of at least one second impedance (Z102) which is at parallel resonance with the pulse period of the pulsed power, thereby to be driven by the divided power across the two ends of the second impedance (Z102) while the first impedance (Z101) is used to limit current, whereof in case that the capacitor (C100) (such as a bipolar capacitor) is used as the first impedance component, the output current is 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 pulsed power parallel resonance as claimed in claim 1, wherein based on 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 bidirectional 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 pulsed power parallel resonance as claimed in claim 1, wherein the first impedance can be selected not to be installed, so as to let the second impedance (Z102) to be directly parallel connected with the pulsed power source.

5. A bi-directional light emitting diode drive circuit in pulsed power parallel resonance as claimed in claim 2, wherein the first impedance can be selected not to be installed, so as to let the second impedance (Z102) to be directly parallel connected with the pulsed power source.

6. A bi-directional light emitting diode drive circuit in pulsed power parallel resonance as claimed in claim 1, wherein one of the first light emitting diode (LED101) or the second light emitting diode (LED102) can be replaced by a diode (CR100) while the current direction of the diode (CR100) and the working current direction of the reserved first light emitting diode (LED101) or the second light emitting diode (LED 102) are in parallel connection of reverse polarities.

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

whereby the bidirectional light emitting diode drive circuit (U100) is constituted by the said circuit structure and selection of auxiliary circuit components.

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

whereof it is comprised of that;

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), whereof their 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) can be optionally series connected with a diode (CR201) as needed, whereby 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 effect;

If the second light emitting diode (LED102) is selected in the bi-directional conducting light emitting diode set (L100), a zener diode can be series connected with the two ends of the said second light emitting diode (LED102), whereof 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) can be optionally series connected with a diode (CR202) as needed, whereby 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 effect.

9. A bi-directional light emitting diode drive circuit in pulsed power parallel resonance as claimed in claim 7, wherein the zener diode is constituted by:

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 series connected in opposite directions and further parallel connected across the two ends of the bi-directional conducting light emitting diode set (L100);

or

3) It is replaced by the diode of bi-directional zener effect which is parallel connected across the two ends of the bi-directional conducting light emitting diode set (L100);

all of the aforesaid three circuits can avoid over high end voltage to the first light emitting diode (LED101) and the second light emitting diode (LED102).

10. A bi-directional light emitting diode drive circuit in pulsed 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), whereof 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), whereby 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 bidirectional light emitting diode drive circuit in pulsed 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 bidirectional light emitting diode drive circuit in pulsed power parallel resonance as claimed in claim 1, wherein it can be further parallel connected a charge/discharge device across the two ends of the first and second light emitting diodes and current limit resistor in series connection;

whereof it is comprised of;

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), whereof 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, or is directly parallel connected across the two ends of the second light emitting diode (LED102), whereof 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, whereof 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 pulsed 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) for the common current limit resistor of the bi-directional conducting light emitting diode set (L100), the main circuit structure is comprised of that:

A charge/discharge device (ESD101) is directly parallel connected across the two ends of the first light emitting diode (LED101) at the same polarity, and a charge/discharge device (ESD102) is directly parallel connected across the two ends of the second light emitting diode (LED102) at the same polarity, whereof the charge/discharge devices (ESD101), (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, etc

14. A bi-directional light emitting diode drive circuit in pulsed 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 saved 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 can be optionally installed as needed to prevent reverse voltage from damaging the uni-polar charge/discharge device;

whereof after the second light emitting diode (LED102) is parallel connected with the uni-polar charge/discharge device (ESD102), a diode (CR102) of forward polarity can be optionally 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 pulsed power parallel resonance as claimed in claim 1, wherein the constitution method of the bi-directional conducting light emitting function of the diode in the bi-directional conducting light emitting diode set (L100) includes that a diode (CR101) is parallel connected with at least one first light emitting diode (LED101) in inverse polarities and a diode (CR102) is parallel connected with at least one second light emitting diode (LED102) in inverse polarities, whereof the two are further series connected in opposite directions to constitute a bi-directional conducting light emitting diode set.

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

17. A bi-directional light emitting diode drive circuit in pulsed 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, whereby 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 pulsed 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 (LED101) or (LED102).

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

A DC power modulator of series connection type (330), which is constituted by conventional electromechanical components or solid state power components and related electronic circuit components to modulate the DC pulsed power output;

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

The circuit function operations are the following;

1) The DC power modulator of series connection type (330) is series connected with the bi-directional light emitting diode drive circuit (U100), whereby to receive the DC pulsed power from the power source, whereof the DC pulsed power is modulated by the DC power modulator of series connection type (330) 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 AC divided power in parallel resonance from 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 pulsed power parallel resonance as claimed in claim 1, wherein it is parallel connected to the power modulator of parallel connection type, whereof the power modulator of the parallel connection type is constituted by the following:

A DC power modulator of parallel connection type (430) is constituted by conventional electromechanical components or solid state power components and related electronic circuit components to modulate the output power of DC pulsed power;

The bi-directional power modulator of parallel connection type (400) which is constituted by conventional electromechanical components or solid state power components and related electronic circuit components to modulate the output power of the bi-directional power;

The circuit operating functions are the following;

1) The DC power modulator of parallel connection type (430) is installed, whereof its output ends are parallel connected with the bi-directional light emitting diode drive circuit (U100) while its input ends are arranged to receive the DC power from the power source, whereof the DC pulsed power is modulated by the DC power modulator of parallel connection type (430) 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, whereof its output ends are parallel connected with the input ends of the bi-directional conducting light emitting diode set (L100) while the input ends of the bi-directional power modulator of parallel connection type (400) are parallel connected with the second impedance (Z102), and whereby the bi-directional AC 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 pulsed power parallel resonance as claimed in claim 1, wherein it is driven by the power outputted from a DC to DC converter, whereof it is constituted by:

A DC to DC converter (5000) which is constituted by conventional electromechanical components or solid state power components and related electronic circuit components, whereof its input ends receive DC power while its output ends provide output DC pulsed power which can be optionally selected to be a constant or variable voltage and constant or variable periods;

The circuit operating functions are the following;

A DC to DC converter (5000), in which its input ends receive DC power while its output ends provide DC pulsed power, wherein the bi-directional light emitting diode drive circuit (U100) is parallel connected with the output ends of the DC to DC converter (5000), and the input ends of the DC to DC converter (5000) receive the optionally selected DC power with constant or variable voltage, or the DC power rectified from AC power;

The output ends of the DC to DC converter (5000) provide output DC pulsed power which can be optionally selected to be a constant or variable voltage and constant or variable periods to control and drive the bi-directional light emitting diode drive circuit (U100);

In addition, the output power of the DC to DC converter (5000) can be operated to output to the bi-directional light emitting diode drive circuit (U100) in series resonance, or to modulate its power output for pulse width modulation or current conduction phase angle control, or impedance modulation, etc to control and drive the bi-directional light emitting diode drive circuit (U100).

22. A bi-directional light emitting diode drive circuit in pulsed power parallel resonance as claimed in claim 1, wherein the bi-directional light emitting diode drive circuit (U100) is series connected with a conventional impedance component (500) and is further parallel connected with the power source, whereof the impedance component (500) includes:

1) An impedance component (500);

it is constituted by a component with resistive impedance characteristics;

or

2) An impedance component (500);

it is constituted by a component with inductive impedance characteristics;

or

3) An impedance component (500);

it is constituted by a component with capacitive impedance characteristics;

or

4) An impedance component (500);

it is constituted by 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) An impedance component (500);

it is constituted by a single impedance component with the combined impedance characteristics of the inductive impedance and capacitive impedance, whereof its inherent resonance frequency is the same as the frequency or period of bi-directional or uni-directional pulsed power, thereby to produce a parallel resonance status;

or

6) An impedance component (500);

it is constituted by capacitive impedance components, or inductive impedance components, or resistive impedance components, including one or more than one kind of one and more than one impedance component, or two or more than two kinds of impedance components in series connection, or parallel connection, or series and parallel connections, thereby to provide a DC or AC impedance;

or

7) An impedance component (500);

it is constituted by the mutual series connection of a capacitive impedance component and an inductive impedance component, whereof its inherent series resonance frequency is the same as the frequency or period of bi-directional or uni-directional pulsed power, thereby 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, whereby its inherent parallel resonance frequency is the same as the frequency or period of bidirectional or uni-directional pulsed power, thereby to produce a parallel resonance status and appear the corresponding end voltage.

23. A bi-directional light emitting diode drive circuit in pulsed 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, whereof the self-coupled transformer (ST200) has a self-coupled voltage change winding (W0) with voltage raising function, 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 (1200) of the second impedance (Z102) to be parallel connected with the capacitor (C200), whereof its inherent parallel resonance frequency after parallel connection produces a parallel resonance status with the pulse period of the pulsed power from power source, thereby to constitute the second impedance (Z102) which is series connected with the capacitor (C100) of the first impedance (Z101), further, the capacitor (C200) can be optionally parallel connected with the a, c taps or b, c taps of the self-coupled transformer (ST200), or other selected taps as needed, whereof 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 rise to drive the bi-directional conducting light emitting diode set (L100).

24. A bi-directional light emitting diode drive circuit in pulsed power parallel resonance as claimed in claim 1, wherein the optionally installed inductive impedance component (1200) of the second impedance (Z102) can be further replaced by the power supply side winding of a transformer with inductive effect, whereof the self-coupled transformer (ST200) has a self-coupled voltage change winding (W0) with voltage drop function, in which the a, 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 (1200) of the second impedance (Z102) to parallel connected with the capacitor (C200), whereof its inherent parallel resonance frequency after parallel connection produces a parallel resonance status with the pulse period of the pulsed power from power source, thereby to constitute the second impedance (Z102) which is series connected with the capacitor (C100) of the first impedance (Z101), further, the capacitor (C200) can be optionally parallel connected with the a, c taps or b, c taps of the self-coupled transformer (ST200), or other selected taps as needed, whereof the b, 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 bidirectional conducting light emitting diode set (L100).

25. A bidirectional light emitting diode drive circuit in pulsed power parallel resonance as claimed in claim 1, wherein the optionally installed inductive impedance component (1200) of the second impedance (Z102) can be further replaced by the power supply side winding of a transformer with inductive effect, whereof the separating type transformer (IT200) is comprised of a primary side winding (W1) and secondary side winding (W2), in which the primary side winding (W1) and the secondary side winding (W2) are separated, whereof the primary side winding (W1) is parallel connected with the capacitor (C200), whereof its inherent parallel resonance frequency after parallel connection produces a parallel resonance status with the pulse period of the pulsed power from power source, thereby to constitute the second impedance (Z102) which is series connected with the capacitor (C100) of the first impedance (Z101), further, the capacitor (C200) can be optionally parallel connected with the a, c taps or b, c taps of the self-coupled transformer (ST200), or other selected taps as needed, whereof the output voltage of the secondary side winding (W2) of the separating type transformer (IT200) can be optionally selected to provide AC power of either voltage rise or voltage drop to drive the bi-directional conducting light emitting diode set (L100);

Based on the above description, the inductive impedance component (1200) 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 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).