CN205160839U - Passive harmonic filter high voltage DC directly drives LED circuit - Google Patents
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Abstract
The utility model provides a passive harmonic filter high voltage DC directly drives LED circuit, the circuit includes that passive harmonic filter, electric main rectification filter circuit, high voltage DC directly drive the three module of LED load circuit. The utility model discloses an important advantage be can realize simultaneously that drive power supply's conversion efficiency is high, power factor is high, the harmonic is little, unglazed stroboscopic and have with low costsly and advantage such as reliability height.
Description
Technical field
The utility model belongs to electronic applications, is specifically related to a kind of passive harmonic filter high direct voltage and directly drives LED circuit.
Background technology
LED has energy-efficient outstanding advantages as a kind of luminescent device of new generation, constantly replaces conventional lighting technology and extensive use.LED chip and LED drive circuit are two key technologies of LED illumination, wherein LED drive circuit has conclusive impact to many important parameters of LED illumination technology such as power factor (PF), harmonic distortion (HD), optical frequency sudden strain of a muscle etc., the more important thing is that the reliability of LED drive circuit is the technical bottleneck restricting the LED illumination lamp life-span at present.Existing LED drive power mainly contains Switching Power Supply and alternating-current direct drives power supply two kinds, although they have its technological deficiency of technological merit also clearly.The power factor of such as Switching Power Supply is high, power supply conversion efficiency is higher, also can reach low harmony wave and unglazed stroboscopic, but its high voltage switch circuit is complicated, the poor reliability life-span is short, and the harmonic problem of Simultaneous Switching power technology is also difficult to solve.Alternating-current direct drives LED technology and has the advantage that circuit is simple, reliability is high, but its LED light stroboscopic problem especially severe.Need to study a kind of LED drive power simultaneously with High Power Factor, low harmony wave, unglazed stroboscopic, efficient, highly reliable, low cost of utility model for this reason, the application and development of LED illumination technology is had to the meaning of particular importance.
Utility model content
For the problems referred to above that LED drive power exists, the utility model provides a kind of passive harmonic filter high direct voltage directly to drive LED circuit, and its structure is as follows:
Passive harmonic filter high direct voltage is directly driven LED circuit and is directly driven LED circuit UC tri-part formed by passive harmonic filter HF, electric main current rectifying and wave filtering circuit BF, high direct voltage.Wherein, passive harmonic filter HF is the inductance capacitance passive harmonic filter be made up of inductance L 1, electric capacity C1 and C2, be responsible for carrying out filtering to the harmonic wave produced by electric main current rectifying and wave filtering circuit BF, to ensure that drive circuit has high power factor and good harmonic responses.Electric main current rectifying and wave filtering circuit BF is made up of rectifier bridge B1 and high-voltage filtering capacitor CH, and electric main is transformed into high direct voltage.High direct voltage is directly driven LED circuit UC and is made up of normal bright LED electronic circuit SB and Q level controlled LED electronic circuit K1 ~ KQ and overvoltage overcurrent control circuit KC, to realize high direct voltage Direct driver LED load.Passive harmonic filter HF, electric main current rectifying and wave filtering circuit BF, high direct voltage are directly driven LED circuit UC and are joined end to end successively.Wherein, electric main current rectifying and wave filtering circuit BF comprises two ac input ends, positive high voltage output VH and reference ground output GND, and high direct voltage is directly driven LED circuit UC and comprised electric current inflow end and outflow of bus current end.
Furtherly, inductance L 1 in passive harmonic filter HF is in parallel with electric capacity C1, one end of inductance L 1 is held with civil power L or civil power N holds and is connected, the other end of inductance L 1 is connected with one end of electric capacity C2, inductance L 1 is connected with an ac input end of electric main current rectifying and wave filtering circuit BF with the node of electric capacity C2, the other end of electric capacity C2 is connected with another ac input end of electric main current rectifying and wave filtering circuit BF, and the other end of electric capacity C2 and the node of electric main current rectifying and wave filtering circuit BF be common to be held with civil power N or civil power L holds and is connected.In other words, civil power L end, N end can exchange.
Two inputs of the rectifier bridge B1 in electric main current rectifying and wave filtering circuit BF are as two ac input ends of electric main current rectifying and wave filtering circuit BF, the positive output end of rectifier bridge B1 is connected with the positive pole of high-voltage filtering capacitor CH, as the positive high voltage output VH of electric main current rectifying and wave filtering circuit BF.The negative output terminal of the rectifier bridge B1 in electric main current rectifying and wave filtering circuit BF is connected with the negative pole of high-voltage filtering capacitor CH, as the reference ground output GND of electric main current rectifying and wave filtering circuit BF.
The electric current inflow end that high direct voltage directly drives LED circuit UC is connected with the positive high voltage output VH of electric main current rectifying and wave filtering circuit BF, and the outflow of bus current end that high direct voltage directly drives LED load circuit U C is connected with reference to ground output GND.
High direct voltage is directly driven LED circuit UC and is made up of normal bright LED electronic circuit SB and Q level controlled LED electronic circuit K1 ~ KQ and overvoltage overcurrent control circuit KC.
Normal bright LED electronic circuit SB is one group of LED containing P series aiding connection, be designated as successively LED1, LED2 ..., LEDP, wherein the electric current of LED1 flows into the head end that end is normal bright LED electronic circuit SB, the electric current that this head end directly drives LED circuit UC as high direct voltage flows into end, be connected with the positive high voltage output VH of electric main current rectifying and wave filtering circuit BF, the outflow of bus current end of LEDP is the tail end of this normal bright LED electronic circuit SB.
The controlled LED electronic circuit of Q level, be designated as successively the 1st grade of controlled LED electronic circuit K1, the 2nd grade of controlled LED electronic circuit K2 ... Q level controlled LED electronic circuit KQ.The structure of Q level controlled LED electronic circuit is identical, and wherein the 1st grade of controlled LED electronic circuit K1 comprises the LED group that a high direct voltage directly drives LED integrated circuit U1, a current sampling resistor Rs1 and controlled series aiding connection.N number of LED in 1st grade of controlled LED electronic circuit K1 be designated as successively LED11, LED21 ... LEDN1.High direct voltage directly drives LED integrated circuit U1 u1 terminal, u2 terminal and u3 terminal, u1 terminal wherein in the 1st grade of controlled LED electronic circuit K1 is connected as the head end of the 1st grade of controlled LED electronic circuit K1 with the positive pole of LEDM1, u2 terminal in 1st grade of controlled LED electronic circuit K1 is connected with the negative pole of LEDN1 and one end of current sampling resistor Rs1, and the u3 terminal in the 1st grade of controlled LED electronic circuit K1 is connected with the other end of current sampling resistor Rs1 as the tail end of the 1st grade of controlled LED electronic circuit K1.The head end of the 1st grade of controlled LED electronic circuit K1 is connected with the tail end of normal bright LED electronic circuit SB, the tail end of the 1st grade of controlled LED electronic circuit K1 is connected with the head end of the 2nd grade of controlled LED electronic circuit K2, the like, the tail end of every one-level controlled LED electronic circuit is connected with the head end of the controlled LED electronic circuit of next stage, and the afterbody i.e. tail end of Q level controlled LED electronic circuit KQ is then connected with the output of overvoltage overcurrent control circuit KC.
Overvoltage overcurrent control circuit KC is made up of over-voltage and over-current integrated circuit UR, MOS transistor T1, voltage sample resistance RH and current sampling resistor RsK, and wherein, over-voltage and over-current integrated circuit UR has 5 pins.The drain D of MOS transistor T1 is as the output of overvoltage overcurrent control circuit KC, be connected with the tail end of Q level controlled LED electronic circuit KQ, the source S of MOS transistor T1 and 5 pin of over-voltage and over-current integrated circuit UR, one end of current sampling resistor RsK is connected, the grid G of MOS transistor T1 is connected with 4 pin of over-voltage and over-current integrated circuit UR, one end of voltage sample resistance RH is connected with the positive high voltage output VH of electric main current rectifying and wave filtering circuit BF, the other end of voltage sample resistance RH is connected with 3 pin of over-voltage and over-current integrated circuit UR, 2 pin of over-voltage and over-current integrated circuit UR are vacant, the other end of current sampling resistor RsK is connected with 1 pin of over-voltage and over-current integrated circuit UR, the outflow of bus current end of LED load circuit U C is directly driven as high direct voltage, be connected with reference to ground output GND.
Furtherly, the power supply conversion efficiency of this circuit is greater than 90%, and power factor (PF) is greater than 0.97, current ripples is lower than 1%, overcome optical frequency to dodge, total harmonic distortion is less than 20%, 3 subharmonic be less than 15%, 5 subharmonic be less than 5%, 7 and above subharmonic be less than 2%.
Furtherly, high direct voltage directly drives the model of LED integrated circuit is TF11.The model of over-voltage and over-current integrated circuit UR is G13.
The LED number of the series aiding connection of usual normal bright LED electronic circuit SB is 20 to 60, the progression Q of Q level controlled LED electronic circuit K1 ~ KQ is about 2 to 6, the LED number of the series aiding connection in every one-level controlled LED electronic circuit K1 ~ KQ is 5 ~ 20, it is the product of Hefei Spruce Optoelectronic Technology Co., Ltd. that high direct voltage directly drives LED integrated circuit U1 ~ UQ, model is TF11, over-voltage and over-current integrated circuit UR is the product of Hefei Spruce Optoelectronic Technology Co., Ltd., and model is G13.
good effect of the present utility model is:
The novel passive harmonic filter high direct voltage that the utility model proposes directly drives LED circuit, the important advantage of this technology be can realize that the conversion efficiency of driving power is high, power factor is high, harmonic wave is little simultaneously, the feature of unglazed stroboscopic and there is the advantage that cost is low and reliability is high.Which overcome the circuit complexity of existing LED switch power drives technology, humorous wave height, shortcoming that reliability is low, overcome again the optical frequency sudden strain of a muscle problem that alternating-current direct drives LED Driving technique simultaneously, to greatly promote the application & development of LED illumination technology as LED Driving technique of new generation, there is good economic and social benefit.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
See Fig. 1, passive harmonic filter high direct voltage is directly driven LED circuit and is directly driven LED circuit UC tri-part formed by passive harmonic filter HF, electric main current rectifying and wave filtering circuit BF, high direct voltage.Wherein,
Passive harmonic filter HF is the inductance capacitance passive harmonic filter be made up of inductance L 1, electric capacity C1 and C2, be responsible for carrying out filtering to the harmonic wave produced by electric main current rectifying and wave filtering circuit BF, to ensure that drive circuit has high power factor and good harmonic responses.
Electric main current rectifying and wave filtering circuit BF is made up of rectifier bridge B1 and high-voltage filtering capacitor CH, and electric main is transformed into high direct voltage.
High direct voltage is directly driven LED circuit UC and is made up of normal bright LED electronic circuit SB and Q level controlled LED electronic circuit K1 ~ KQ and overvoltage overcurrent control circuit KC, to realize high direct voltage Direct driver LED load.
Passive harmonic filter HF, electric main current rectifying and wave filtering circuit BF, high direct voltage are directly driven LED circuit UC and are joined end to end successively.Wherein, electric main current rectifying and wave filtering circuit BF comprises two ac input ends, positive high voltage output VH and reference ground output GND, and high direct voltage is directly driven LED circuit UC and comprised electric current inflow end and outflow of bus current end.
Inductance L 1 in passive harmonic filter HF is in parallel with electric capacity C1, one end of inductance L 1 is held with civil power L or civil power N holds and is connected, the other end of inductance L 1 is connected with one end of electric capacity C2, inductance L 1 is connected with an ac input end of electric main current rectifying and wave filtering circuit BF with the node of electric capacity C2, the other end of electric capacity C2 is connected with another ac input end of electric main current rectifying and wave filtering circuit BF, and the other end of electric capacity C2 and the node of electric main current rectifying and wave filtering circuit BF be common to be held with civil power N or civil power L holds and is connected.In other words, civil power L end, N end can exchange.
Two inputs of the rectifier bridge B1 in electric main current rectifying and wave filtering circuit BF are as two ac input ends of electric main current rectifying and wave filtering circuit BF, the positive output end of rectifier bridge B1 is connected with the positive pole of high-voltage filtering capacitor CH, as the positive high voltage output VH of electric main current rectifying and wave filtering circuit BF.The negative output terminal of the rectifier bridge B1 in electric main current rectifying and wave filtering circuit BF is connected with the negative pole of high-voltage filtering capacitor CH, as the reference ground output GND of electric main current rectifying and wave filtering circuit BF.
The electric current inflow end that high direct voltage directly drives LED circuit UC is connected with the positive high voltage output VH of electric main current rectifying and wave filtering circuit BF, and the outflow of bus current end that high direct voltage directly drives LED load circuit U C is connected with reference to ground output GND.
High direct voltage is directly driven LED circuit UC and is made up of normal bright LED electronic circuit SB and Q level controlled LED electronic circuit K1 ~ KQ and overvoltage overcurrent control circuit KC.
Wherein, normal bright LED electronic circuit SB be one group of series aiding connection LED1, LED2 ..., LEDP, wherein the electric current of LED1 flows into the head end that end is normal bright LED electronic circuit SB, the electric current that this head end directly drives LED circuit UC as high direct voltage flows into end, be connected with the positive high voltage output VH of electric main current rectifying and wave filtering circuit BF, the outflow of bus current end of LEDP is the tail end of this normal bright LED electronic circuit SB.
Wherein, the structure of Q level controlled LED electronic circuit K1 ~ KQ is identical, wherein the 1st grade of controlled LED electronic circuit K1 comprises a special DC high voltage direct and drives LED integrated circuit U1, the LED group LEDM1 ~ LEDN1 of a current sampling resistor Rs1 and controlled series aiding connection, special DC high voltage direct drives LED integrated circuit U1 u1, u2 and u3 tri-terminals, wherein the positive pole of u1 and LEDM1 is connected as the head end of the 1st grade of controlled LED electronic circuit K1, the negative pole of u2 and LEDN1 and one end of current sampling resistor Rs1 are connected, u3 is connected with the other end of current sampling resistor Rs1 as the tail end of the 1st grade of controlled LED electronic circuit K1.The head end of the 1st grade of controlled LED electronic circuit K1 is connected with the tail end of normal bright LED electronic circuit SB, the tail end of the 1st grade of controlled LED electronic circuit K1 is connected with the head end of the 2nd grade of controlled LED electronic circuit K2, the like, the tail end of every one-level controlled LED electronic circuit is connected with the head end of the controlled LED electronic circuit of next stage, and the afterbody i.e. tail end of Q level controlled LED electronic circuit KQ is then connected with the output of overvoltage overcurrent control circuit KC.
Wherein overvoltage overcurrent control circuit KC is by over-voltage and over-current integrated circuit UR and MOS transistor T1, voltage sample resistance RH and current sampling resistor RsK is formed, wherein, over-voltage and over-current integrated circuit UR has 5 pins, the drain D of MOS transistor T1 is as the output of overvoltage overcurrent control circuit KC, be connected with the tail end of Q level controlled LED electronic circuit KQ, the source S of MOS transistor T1 and 5 pin of over-voltage and over-current integrated circuit UR, one end of current sampling resistor RsK is connected, the grid G of MOS transistor T1 is connected with 4 pin of over-voltage and over-current integrated circuit UR, one end of voltage sample resistance RH is connected with the positive high voltage output VH of electric main current rectifying and wave filtering circuit BF, the other end of voltage sample resistance RH is connected with 3 pin of over-voltage and over-current integrated circuit UR, 2 pin of over-voltage and over-current integrated circuit UR are vacant, the other end of current sampling resistor RsK is connected with 1 pin of over-voltage and over-current integrated circuit UR, the outflow of bus current end of LED load circuit U C is directly driven as high direct voltage, be connected with reference to ground output GND.
The LED number of the series aiding connection of usual normal bright LED electronic circuit SB is 20 to 60, the progression Q of Q level controlled LED electronic circuit K1 ~ KQ is about 2 to 6, the LED number of the series aiding connection in every one-level controlled LED electronic circuit K1 ~ KQ is 5 ~ 20, it is the product of Hefei Spruce Optoelectronic Technology Co., Ltd. that special DC high voltage direct drives LED integrated circuit U1 ~ UQ, model is TF11, over-voltage and over-current integrated circuit UR is the product of Hefei Spruce Optoelectronic Technology Co., Ltd., and model is G13.
Directly drive in LED Method and circuits in the passive harmonic filter high direct voltage shown in Fig. 1: the inductance value of inductance L 1 is 600mH, working current value 0.5A.The capacitance of electric capacity C1 is 1uF, magnitude of voltage 200V, and the capacitance of electric capacity C2 is 1uF, magnitude of voltage 450V.The model of rectifier bridge B1 is DB157S, and the capacitance of high-voltage filtering capacitor CH is 16uF, voltage 450V.LED number P in normal bright LED electronic circuit SB is 50, the progression Q of Q level controlled LED electronic circuit K1 ~ KQ is 4, LED number wherein in every grade of controlled LED electronic circuit is 10, and the parameter of LED is power 1W electric current 350mA, and it is TF11 that high direct voltage directly drives LED integrated circuit U1 ~ U4 model.The resistance of the current sampling resistor Rs1 in the 1st grade of LED electronic circuit K1 is 4.7 ohm.The resistance of the current sampling resistor Rs2 in the 2nd grade of LED electronic circuit K2 is 5.6 ohm.The resistance of the current sampling resistor Rs3 in 3rd level LED electronic circuit KL3 is 6.2 ohm.The resistance of the current sampling resistor Rs4 in the 4th grade of LED electronic circuit K4 is 6.8 ohm.The model of over-voltage and over-current integrated circuit UR is that the model of G13, MOS transistor T1 is 1N60 or 3N80, the resistance of current sampling resistor RsK is 2.4 ohm, the resistance of voltage sample resistance RH is 1 megohm.
The performance that this passive harmonic filter high direct voltage directly drives LED circuit is: driving power is 80W, power supply conversion efficiency is greater than 90%, power factor (PF) is greater than 0.97, current ripples is lower than 1%, overcome optical frequency to dodge, total harmonic distortion (THD) is less than 20%, wherein 3 subharmonic be less than 15%, 5 subharmonic be less than 5%, 7 and later subharmonic be all less than 2%.
Claims (5)
1. passive harmonic filter high direct voltage directly drives LED circuit, it is characterized in that: directly driven LED circuit UC tri-part formed by passive harmonic filter HF, electric main current rectifying and wave filtering circuit BF, high direct voltage; Wherein,
Passive harmonic filter HF is the inductance capacitance passive harmonic filter be made up of inductance L 1, electric capacity C1 and C2, be responsible for carrying out filtering to the harmonic wave produced by electric main current rectifying and wave filtering circuit BF, to ensure that drive circuit has high power factor and good harmonic responses;
Electric main current rectifying and wave filtering circuit BF is made up of rectifier bridge B1 and high-voltage filtering capacitor CH, and electric main is transformed into high direct voltage;
High direct voltage is directly driven LED circuit UC and is made up of normal bright LED electronic circuit SB and Q level controlled LED electronic circuit K1 ~ KQ and overvoltage overcurrent control circuit KC, to realize high direct voltage Direct driver LED load.
2. passive harmonic filter high direct voltage according to claim 1 directly drives LED circuit, it is characterized in that: passive harmonic filter HF, electric main current rectifying and wave filtering circuit BF, high direct voltage are directly driven LED circuit UC and joined end to end successively; Wherein, electric main current rectifying and wave filtering circuit BF comprises two ac input ends, positive high voltage output VH and reference ground output GND, and high direct voltage is directly driven LED circuit UC and comprised electric current inflow end and outflow of bus current end;
Inductance L 1 in passive harmonic filter HF is in parallel with electric capacity C1, one end of inductance L 1 is held with civil power L or civil power N holds and is connected, the other end of inductance L 1 is connected with one end of electric capacity C2, inductance L 1 is connected with an ac input end of electric main current rectifying and wave filtering circuit BF with the node of electric capacity C2, and the other end of electric capacity C2 is connected with another ac input end of electric main current rectifying and wave filtering circuit BF; The other end of electric capacity C2 and the node of electric main current rectifying and wave filtering circuit BF be common to be held with civil power N or civil power L holds and is connected;
Two inputs of the rectifier bridge B1 in electric main current rectifying and wave filtering circuit BF are as two ac input ends of electric main current rectifying and wave filtering circuit BF, the positive output end of rectifier bridge B1 is connected with the positive pole of high-voltage filtering capacitor CH, as the positive high voltage output VH of electric main current rectifying and wave filtering circuit BF; The negative output terminal of the rectifier bridge B1 in electric main current rectifying and wave filtering circuit BF is connected with the negative pole of high-voltage filtering capacitor CH, as the reference ground output GND of electric main current rectifying and wave filtering circuit BF;
The electric current inflow end that high direct voltage directly drives LED circuit UC is connected with the positive high voltage output VH of electric main current rectifying and wave filtering circuit BF, and the outflow of bus current end that high direct voltage directly drives LED load circuit U C is connected with reference to ground output GND.
3. passive harmonic filter high direct voltage according to claim 2 directly drives LED circuit, it is characterized in that: high direct voltage is directly driven LED circuit UC and is made up of normal bright LED electronic circuit SB and the controlled LED electronic circuit of Q level and overvoltage overcurrent control circuit KC;
Normal bright LED electronic circuit SB is one group of LED containing P series aiding connection, be designated as successively LED1, LED2 ..., LEDP, wherein the electric current of LED1 flows into the head end that end is normal bright LED electronic circuit SB, the electric current that this head end directly drives LED circuit UC as high direct voltage flows into end, be connected with the positive high voltage output VH of electric main current rectifying and wave filtering circuit BF, the outflow of bus current end of LEDP is the tail end of this normal bright LED electronic circuit SB;
Q level controlled LED electronic circuit be designated as successively the 1st grade of controlled LED electronic circuit K1, the 2nd grade of controlled LED electronic circuit K2 ... Q level controlled LED electronic circuit KQ; The structure of Q level controlled LED electronic circuit is identical, includes the LED group that 1 high direct voltage directly drives LED integrated circuit, 1 current sampling resistor and 1 controlled series aiding connection; Wherein,
In the 1st grade of controlled LED electronic circuit K1, high direct voltage is directly driven LED integrated circuit and is designated as U1, and current sampling resistor is designated as Rs1, the N number of LED in the LED group of controlled series aiding connection be designated as successively LED11, LED21 ... LEDN1; High direct voltage directly drives LED integrated circuit U1 u1 terminal, u2 terminal and u3 terminal, u1 terminal wherein in the 1st grade of controlled LED electronic circuit K1 is connected as the head end of the 1st grade of controlled LED electronic circuit K1 with the positive pole of LED11, u2 terminal in 1st grade of controlled LED electronic circuit K1 is connected with the negative pole of LEDN1 and one end of current sampling resistor Rs1, and the u3 terminal in the 1st grade of controlled LED electronic circuit K1 is connected as the tail end of the 1st grade of controlled LED electronic circuit K1 with the other end of the current sampling resistor Rs1 in the 1st grade of controlled LED electronic circuit K1; The head end of the 1st grade of controlled LED electronic circuit K1 is connected with the tail end of normal bright LED electronic circuit SB, the tail end of the 1st grade of controlled LED electronic circuit K1 is connected with the head end of the 2nd grade of controlled LED electronic circuit K2, the like, the tail end of every one-level controlled LED electronic circuit is connected with the head end of the controlled LED electronic circuit of next stage, and the afterbody i.e. tail end of Q level controlled LED electronic circuit KQ is then connected with the output of overvoltage overcurrent control circuit KC;
Overvoltage overcurrent control circuit KC is made up of over-voltage and over-current integrated circuit UR, MOS transistor T1, voltage sample resistance RH and current sampling resistor RsK, and wherein, over-voltage and over-current integrated circuit UR has 5 pins, the drain D of MOS transistor T1, as the output of overvoltage overcurrent control circuit KC, is connected with the tail end of Q level controlled LED electronic circuit KQ, the source S of MOS transistor T1 and 5 pin of over-voltage and over-current integrated circuit UR, one end of current sampling resistor RsK is connected, the grid G of MOS transistor T1 is connected with 4 pin of over-voltage and over-current integrated circuit UR, one end of voltage sample resistance RH is connected with the positive high voltage output VH of electric main current rectifying and wave filtering circuit BF, the other end of voltage sample resistance RH is connected with 3 pin of over-voltage and over-current integrated circuit UR, 2 pin of over-voltage and over-current integrated circuit UR are vacant, the other end of current sampling resistor RsK is connected with 1 pin of over-voltage and over-current integrated circuit UR, the outflow of bus current end of LED load circuit U C is directly driven as high direct voltage, be connected with reference to ground output GND.
4. passive harmonic filter high direct voltage according to claim 3 directly drives LED circuit, it is characterized in that: the power supply conversion efficiency of this circuit is greater than 90%, power factor is greater than 0.97, current ripples is lower than 1%, overcome optical frequency to dodge, current total harmonic distortion is less than 20%, 3 subharmonic be less than 15%, 5 subharmonic be less than 5%, 7 and later subharmonic be less than 2%.
5. passive harmonic filter high direct voltage according to claim 3 directly drives LED circuit, it is characterized in that: the model that high direct voltage directly drives LED integrated circuit is TF11; The model of over-voltage and over-current integrated circuit UR is G13.
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| CN201521024972.0U CN205160839U (en) | 2015-12-11 | 2015-12-11 | Passive harmonic filter high voltage DC directly drives LED circuit |
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| CN201521024972.0U CN205160839U (en) | 2015-12-11 | 2015-12-11 | Passive harmonic filter high voltage DC directly drives LED circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105657886A (en) * | 2015-12-11 | 2016-06-08 | 合肥云杉光电科技有限公司 | Passive harmonic-filter direct-current high-voltage direct driving LED method and circuit thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105657886A (en) * | 2015-12-11 | 2016-06-08 | 合肥云杉光电科技有限公司 | Passive harmonic-filter direct-current high-voltage direct driving LED method and circuit thereof |
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