Uni-directional light emitting diode drive circuit in pulsed power non-resonance

• US 8,049,440 B2
• Filed: 01/12/2009
• Issued: 11/01/2011
• 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:
  US12/351,914
• Publication Number:
  US 20090179592A1
• Time in Patent Office: 1,023 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 45/31 Phase-control circuits
• CPC Class Codes: H05B 45/32 Pulse-control circuits
• CPC Class Codes: H05B 45/325 Pulse-width modulation [PWM]
• CPC Class Codes: H05B 45/382 with galvanic isolation between input and output

Abstract

The present invention uses the capacitive, inductive, or resistive impedance component to constitute the first impedance, and uses the inductive impedance component and capacitive impedance component which will not produce parallel resonance after parallel connection to constitute the second impedance, whereby the first impedance and the second impedance are series connected for inputting pulsed DC power, and the divided power generated at the two ends of the first or second impedance is rectified to drive the uni-directional light emitting diode.

Claims

1. A uni-directional light emitting diode drive circuit in pulsed power non-resonance, wherein a pulsed power is used as the power source, a first impedance includes a capacitive impedance component, or inductive impedance component or resistive impedance component, and capacity impedance and inductive impedance are in parallel connection wherein their parallel resonance frequency is different from the pulse period of the pulsed power, comprising the second impedance without parallel resonance, wherein the two ends of the first impedance and the second impedance in series connection are provided to receive a DC pulsed power input as power source which includes the following:

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

the first impedance and the second impedance in series connection are provided to divide the inputted DC pulsed voltage, to form a bi-directional divided alternated power across the two ends of the second impedance, wherein the divided power at the second impedance is rectified by a rectifier device to an uni-directional DC power to drive an uni-directional conducting light emitting diode, and it is characterized in that the volume and weight of the circuit can be effectively reduced as well as the cost can be lowered for the uni-directional light emitting diode drive circuit in pulsed power non-resonance in high frequency pulsed power applications;

the first impedance, the second impedance, the rectifier device and the uni-directional conducting light emitting diode set as well as the light emitting diode and various optional auxiliary circuit components are based on application needs, wherein the circuit components can be optionally installed or not installed as needed and the installed quantity may include one circuit component, 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 uni-directional light emitting diode drive circuit in pulsed power non-resonance as claimed in claim 1, wherein at least one capacitive impedance component (or inductive impedance component or resistive impedance component) constitutes the first impedance, and at least one capacitive impedance component and at least one inductive impedance component are in parallel connection, wherein their inherent resonance frequency after parallel connection is different from the pulse period of the pulsed power, thereby to constitute the second impedance without parallel resonance, and at least one light emitting diode constitutes the uni-directional light emitting diode set which is connected across the positive and negative output ends of a rectifier device, and the AC input ends of the said rectifier device are parallel connected across the two ends of the second impedance;

according to the aforementioned circuit structure, the two ends of the first impedance and the second impedance in series connection are provided to receive pulsed power, whereby to form the bi-directional divided alternated power in decaying wave shape at the second impedance by means of the parallel connected capacitor and inductive impedance component, and to transmit the bi-directional divided alternated power in decaying wave shape at the second impedance to the AC input ends of the rectifier device which is parallel connected across the two ends of the second impedance, whereby the rectified DC power is used to drive at least one uni-directional conducting light emitting diode, or to drive at least two rectifier devices which are respectively parallel connected across the two ends of the first impedance and the second impedance to respectively receive the AC power inputs from the first impedance and the second impedance for converting to the DC power outputs, thereby to drive the individual uni-directional conducting light emitting diodes and constitute the un-directional light emitting diode drive circuit in pulsed power non-resonance;

wherein it is comprised of;

a first impedance (Z101) including the capacitive impedance component (or the inductive impedance component, or the resistive impedance component) in one or more than one kinds and one or more than one impedance components;

or including two or more than two kinds of impedance components, wherein each kind of impedance component can be one or more than one in series connection, or parallel connection, or series and parallel connection;

the first impedance (Z101) includes at least one capacitive impedance component and at least one inductive impedance component in series connection, wherein the inherent series resonance frequency of the two after series connection is the same as the period of a DC power of periodically alternated polarity, thereby to appear series resonance status;

or

the first impedance (Z101) includes at least one capacitive impedance component and at least one inductive impedance component in parallel connection, wherein the inherent parallel resonance frequency of the two after parallel connection is the same as the period of a DC power of periodically alternated polarity, thereby to appear parallel resonance status;

the second impedance (Z102) which includes at least one capacitive impedance component and at least one inductive impedance component in parallel connection, wherein their inherent parallel resonance frequency is different from the pulse period of the pulsed power, therefore no parallel resonance is produced;

the said uni-directional light emitting diode drive circuit in pulsed power non-resonance can be optionally installed with capacitive, inductive or resistive impedance components as needed, wherein the first impedance (Z101) includes at least one of said three types of impedance components;

the first impedance (Z101) of the uni-directional light emitting diode drive circuit in pulsed power non-resonance can also be optionally selected as needed not to be installed, while the second impedance (Z102) is directly parallel connected with a pulsed power source to form a bi-directional alternated power in decaying wave shape in a non-parallel resonance status;

a rectifier device (BR101);

It is parallel connected across the two ends of the first impedance (Z101) or the second impedance (Z102), or parallel connected across the two ends of the first impedance (Z101) and the two ends of the second impedance (Z102) simultaneously, wherein the divided power across the two ends of the first impedance (Z101) or the second impedance (Z102) is rectified to a DC power, whereby to drive the uni-directional conducting light emitting diode set (L100);

the rectifier device can include a bridge type rectifier device or by a half-wave rectifier device, wherein the number of rectifier device (BR101) can be one or more than one;

an uni-directional conducting light emitting diode set (L100) including a forward current polarity light emitting diode, or two or more than two forward current polarity light emitting diodes in series connection or parallel connection, or three or more than three forward current polarity light emitting diodes in series connection, parallel connection, or series and parallel connection;

the uni-directional conducting light emitting diode set (L100) can be selected to be installed one set or more than one set as needed, wherein it is arranged to be driven by the DC power outputted from the rectifier device (BR101);

the first impedance (Z101), the second impedance (Z102), the uni-directional conducting light emitting diode set (L100) and the rectifier device (BR101) in the uni-directional light emitting diode drive circuit (U100) can be optionally selected as needed to be one or more one;

the two ends of the at least one first impedance and the at least one second impedance in series connection are provided to receive pulsed power, whereby to form the bi-directional divided alternated power in decaying wave shape at the second impedance by means of the parallel connected capacitor and inductive impedance component, and to transmit the bi-directional divided alternated power in decaying wave shape at the second impedance to the AC input end of the rectifier device which is parallel connected across the two ends of the second impedance, whereby the rectified DC power is used to drive at least one uni-directional conducting light emitting diode, or to drive at least two rectifier devices which are respectively parallel connected across the two ends of the first impedance and the second impedance to respectively receive the AC power inputs from the first impedance and the second impedance for converting to the DC power outputs, thereby to drive the individual uni-directional conducting light emitting diodes and constitute the un-directional light emitting diode drive circuit in pulsed power non-resonance of the present invention.

3. A uni-directional light emitting diode drive circuit in pulsed power non-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 quantity of the first impedance can be one or more than ones, or the first impedance (Z101) can be optionally selected not to use as needed;

the second impedance (Z102) includes at least one capacitor C200 and at least one inductive impedance component (I200) in parallel connection, and especially including an inductive impedance component and a bipolar capacitor in parallel connection, wherein their inherent parallel resonance frequency after parallel connection is different from the pulse period of the pulsed power thus no parallel resonance is produced;

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

at least one first impedance (Z101) and at least one second impedance (Z102) are in series connection, wherein the two ends of their series connection are provided with a pulsed power input, whereby the bi-directional divided alternated power is formed at the second impedance and is provided to the AC input ends of the rectifier device (BR101) which is parallel connected across the two ends of the second impedance (Z102), whereby the rectified power is used to drive at least one uni-directional conducting light emitting diode set (L100);

the rectifier device (BR101) is installed to receive the divided power from the two ends of the first impedance (Z101) or the second impedance (Z102), or two or more than two rectifier devices (BR101) are installed to respectively receive the divided power from the two ends of the first impedance (Z101) and the second impedance (Z102), thereby the divided power across the two ends of the first impedance (Z101) or the second impedance (Z102) is rectified to DC power to drive the uni-directional conducting light emitting diode set (L100);

the rectifier device can include a bridge type rectifier device or by a half-wave rectifier device, wherein the number of rectifier device (BR101) can be one or more than one;

an uni-directional conducting light emitting diode set (L100) including a forward current polarity light emitting diode (LED101), or two or more than two forward current polarity light emitting diodes (LED101) in series connection or parallel connection, or three or more than three forward current polarity light emitting diodes (LED101) in series connection, parallel connection, or series and parallel connection, wherein one or more than one uni-directional conducting light emitting diode set (L100) can be optionally installed as needed to be driven by the DC power outputted from the rectifier device (BR101);

the bi-directional divided power in decaying wave shape at the two ends of the second impedance (Z102) is provided to the AC input ends of the rectifier device (BR101), whereby it is rectified to a DC power by the rectifier device (BR101) to drive the uni-directional conducting light emitting diode set (L100) while its current is limited by the impedance of the first impedance (Z101), wherein when the first impedance (Z101) includes the capacitor (C100), the outputted current is limited by the capacitive impedance of the capacitor (C100);

a discharge resistor (R101) optionally installed as needed, wherein when the capacitor (C100) (such as a bipolar capacitor) is selected to constitute the first impedance (Z101), it is arranged to be parallel connected across the two ends of capacitor (C100) to release the residual charge of capacitor (C100);

a current limit resistor (R103) optionally installed as needed to be individually series connected with each of light emitting diodes (LED101) which constitute the uni-directional conducting light emitting diode set (L100), whereby to limit the current passing through the light emitting diode (LED101);

wherein the current limit resistor (R103) can also be replaced by an inductive impedance component (1103);

thereby, based on said circuit structure the first impedance (Z101), the second impedance (Z102), the rectifier device (BR101) and the uni-directional conducting light emitting diode set (L100) can be connected to constitute the uni-directional light emitting diode drive circuit (U100).

4. A uni-directional light emitting diode drive circuit in pulsed power non-resonance as claimed in claim 1, wherein the uni-directional conducting light emitting diode set (L100) in the uni-directional light emitting diode drive circuit (U100) is through the divided power distribution effect by the parallel connection between the rectifier device (BR101) and the second impedance (Z102) to reduce the voltage variation rate across the two ends of uni-directional conducting light emitting diode set (L100) corresponding to the power source of voltage variation.

5. A uni-directional light emitting diode drive circuit in pulsed power non-resonance as claimed in claim 1, wherein the light emitting diode (LED101) which constitutes the uni-directional conducting light emitting diode set (L100) in the uni-directional light emitting diode drive circuit (U100) includes the uni-directional conducting light emitting diode set (L100) includes a forward current polarity light emitting diode, or two or more than two forward current polarity light emitting diodes in series connection or parallel connection, or three or more than three forward current polarity light emitting diodes in series connection, parallel connection, or series and parallel connection, wherein one or more than one uni-directional conducting light emitting diode set (L100) can be optionally selected as needed.

6. A uni-directional light emitting diode drive circuit in pulsed power non-resonance as claimed in claim 1, wherein to protect the light emitting diode and to avoid the light emitting diode (LED101) being damaged or reduced working life by abnormal voltage, a zener diode can be further parallel connected across the two ends of the light emitting diode (LED101) of the uni-directional conducting light emitting diode set (L100) in the uni-directional light emitting diode drive circuit (U100) of the uni-directional light emitting diode drive circuit in pulsed power non-resonance, or the zener diode can be first series connected with at least one diode to jointly produce the function of zener voltage effect, then to be parallel connected across the two ends of the light emitting diode (LED101);

wherein;

the zener diode (ZD101) is parallel connected across the two ends of the light emitting diode (LED101) of the uni-directional conducting light emitting diode set (L100) in the uni-directional light emitting diode drive circuit (U100), wherein 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 light emitting diode (LED101);

the zener diode (ZD101) is parallel connected across the two ends of the light emitting diode (LED101) of the uni-directional conducting light emitting diode set (L100) in the uni-directional light emitting diode drive circuit (U100), wherein the said zener diode (ZD101) can be optionally series connected with a diode (CR201) as needed to produce the zener voltage effect together, whereby the advantages are

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

     2) both diode (CR201) and zener diode (ZD101) have temperature compensation effect.

7. A uni-directional light emitting diode drive circuit in pulsed power non-resonance as claimed in claim 1, wherein to promote the lighting stability of the light source produced by the light emitting diode in the uni-directional light emitting diode drive circuit (U100) of the uni-directional light emitting diode drive circuit in pulsed power non-resonance, the light emitting diode (LED101) can be further installed with a charge/discharge device (ESD101), wherein random power charging or discharging can be provided by the charge/discharge device (ESD101) to stabilize the lighting stability of the light emitting diode (LED101), whereby to reduce its lighting pulsation, or in case of power supply off, reserved power can be supplied by the charge/discharge device (ESD101) to drive the light emitting diode (LED101) to emit light continuously;

wherein;

the uni-directional conducting light emitting diode set (L100) can be further installed with a charge/discharge device (ESD101) including to be parallel connected across the two ends of the light emitting diode (LED101) and the current limit resistor (R103) in series connection, or across the two ends of the light emitting diode (LED101) according to polarities, wherein random power charging or discharging can be provided by the charge/discharge device (ESD101) to stabilize the lighting stability of the light emitting diode (LED101), whereby to reduce its lighting pulsation, or in case of power supply off, reserved power can be supplied by the charge/discharge device (ESD101) to drive the light emitting diode (LED101) to emit light continuously;

the aforesaid charge/discharge device (ESD101) can include the conventional charging and discharging batteries, or super-capacitors or capacitors.

8. A uni-directional light emitting diode drive circuit in pulsed power non-resonance as claimed in claim 1, wherein in the uni-directional light emitting diode drive circuit (U100), an uni-directional conducting light emitting diode set (L100) or more than one uni-directional conducting light emitting diode sets (L100) in series connection, parallel connection or series and parallel connection can be optionally installed as needed in the uni-directional conducting light emitting diode set (L100), wherein if one or more than one set is installed, it can be driven by the divided power of a common impedance (Z102) through its matched rectifier device (BR101), or it can be individually driven by the divided power of multiple second impedances (Z102) in series or parallel connection, wherein each of the multiple second impedances (Z102) is installed with a rectifier device (BR101) individually to drive its corresponding matched uni-directional conducting light emitting diode set (L100) individually.

9. A uni-directional light emitting diode drive circuit in pulsed power non-resonance as claimed in claim 1, wherein if a charge/discharge device (ESD101) is installed in the uni-directional light emitting diode drive circuit (U100), the light emitting diode (LED101) of the uni-directional conducting light emitting diode set (L100) is driven by continuous DC power to emit light.

10. A uni-directional light emitting diode drive circuit in pulsed power non-resonance as claimed in claim 1, wherein if the charge/discharge device (ESD101) is not installed, current conduction to light emitting diode (LED101) 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 uni-directional conducting light emitting diode set (L100) can be correspondingly selected for the light emitting diode (LED101);

if current conduction to light emitting diode (LED101) 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 (LED101) is followed.

11. A uni-directional light emitting diode drive circuit in pulsed power non-resonance as claimed in claim 1, wherein if the charge/discharge device (ESD101) is not installed, then based on the value and wave shape of the 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).

12. A uni-directional light emitting diode drive circuit in pulsed power non-resonance as claimed in claim 1, wherein in the application of the uni-directional light emitting diode drive circuit (U100), the following different types of DC power can be provided for inputs, wherein the pulsed power includes:

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 from DC power which is further rectified from AC power;

or

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

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

a DC power modulator of series connection type (330) including conventional electromechanical components or solid state power components and related electronic circuit components to modulate the DC power output;

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 DC power modulator of series connection type (330) is series connected with the uni-directional light emitting diode drive circuit (U100) to receive the DC pulsed power from power source, whereby 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 uni-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 AC input ends of the rectifier device (BR101) whereby the bi-directional pulse divided power in decaying wave shape 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 uni-directional conducting light emitting diode set (L100) through the rectifier device (BR101);

or

3) the DC power modulator of series connection type (330) is series connected between the DC output ends of the rectifier device (BR101) and the uni-directional conducting light emitting diode set (L100), whereby DC power from the rectifier device (BR101) 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 uni-directional conducting light emitting diode set (L100).

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

a DC power modulator of parallel connection type (430) including 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 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 DC power modulator of parallel connection type (430) is installed, wherein its output ends are for parallel connection with the uni-directional light emitting diode drive circuit (U100), while its input ends are provided for receiving the pulsed power from the power source, whereby the 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 uni-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 AC input ends of the rectifier device (BR101) while its input ends are parallel connected across the two ends of the second impedance (Z102), whereby the bi-directional pulse divided power in decaying wave shape from 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 uni-directional conducting light emitting diode set (L100) through the rectifier device (BR101);

or

3) the DC power modulator of parallel connection type (430) is installed, wherein its output ends are parallel connected with the uni-directional conducting light emitting diode set (L100), while its input ends are parallel connected with the DC output ends of the rectifier device (BR101), whereby the DC power from the rectifier device (BR101) 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 uni-directional conducting light emitting diode set (L100).

15. A uni-directional light emitting diode drive circuit in pulsed power non-resonance as claimed in claim 1, wherein it is driven by the power outputted from a DC to DC converter, comprising:

a DC to DC converter (5000) including conventional electromechanical components or solid state power components and related electronic circuit components, wherein its input ends receive DC power while its output ends provide output which can be optionally selected as needed to be a DC pulsed power with 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 uni-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 is arranged to receive the optionally selected DC power with constant or variable voltage, or the DC power rectified from AC power;

the output provided by the output ends of the DC to DC converter (5000) can be optionally selected as needed to be DC pulsed power with constant or variable voltage and constant or variable periods to control and drive the uni-directional light emitting diode drive circuit (U100);

in addition, the uni-directional light emitting diode drive circuit (U100) can be controlled and driven by modulating the output power from the DC to DC converter (5000) or by executing power modulations such as pulse width modulation or current conduction phase angle control, or impedance modulation to the power outputted.

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

1) a component with capacitive impedance characteristics;

or

2) a component with inductive impedance characteristics;

or

3) a component with resistive 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 capacitive impedance and inductive impedance, wherein 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) 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) 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 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 bi-directional or uni-directional pulsed power, thereby to produce a parallel resonance status and appear the corresponding end voltage.

17. A uni-directional light emitting diode drive circuit in pulsed power non-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 a voltage raising function, and the b, c taps of the self-coupled voltage change winding (W0) of the self-coupled transformer (ST200) are the power supply side which replaces the inductive impedance component (I200) of the second impedance (Z102) to be parallel connected with a capacitor C200, wherein its inherent parallel resonance frequency after the parallel connection is not in parallel resonance with the pulse period of the pulsed power, thereby to constitute the second impedance (Z102);

the a, c output taps of the self-coupled voltage change winding (W0) of the self-coupled transformer (ST200) are arranged to provide a bi-directional alternated AC power of voltage rise to the AC input ends of the rectifier device (BR101), while the DC output ends of the rectifier device (BR101) are used to drive the uni-directional conducting light emitting diode set (L100).

18. A uni-directional light emitting diode drive circuit in pulsed power non-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, and 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 (I200) of the second impedance (Z102) to be parallel connected with the capacitor C200, wherein its inherent parallel resonance frequency after parallel connection is not in parallel resonance with the pulse period of the pulsed power source, thereby to constitute the second impedance (Z102);

the b, c output ends of the self-coupled voltage change winding (W0) of the self-coupled transformer (ST200) are arranged to provide a bi-directional alternated AC power of voltage drop to the AC input ends of the rectifier device (BR101), while the DC output ends of the rectifier device (BR101) are used to drive the uni-directional conducting light emitting diode set (L100).

19. A uni-directional light emitting diode drive circuit in pulsed power non-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 wherein the primary side winding (W1) is parallel connected with the capacitor C200, its inherent parallel resonance frequency after parallel connection is not in parallel resonance with the pulse period of the pulsed power, thereby to constitute the second impedance (Z102);

the output voltage of the secondary side winding (W2) of the separating type transformer (IT200) can be optionally selected as needed to be a voltage rise or a voltage drop, wherein the bi-directional alternated power output from the secondary side winding is arranged to transmit to the AC input ends of the rectifier device (BR101), while the DC output end of the rectifier device (BR101) is used to transmit the DC power to the uni-directional conducting light emitting diode set (L100);

through the above description, 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, whereby to constitute the second impedance (Z102), wherein the secondary side of the separating type transformer (IT200) provides AC power of voltage rise or voltage drop to the AC input ends of the rectifier device (BR101) while the DC output ends of the rectifier device (BR101) are used to drive the uni-directional conducting light emitting diode set (L100).