CN109688654B - LED driving circuit adopting nonpolar capacitor - Google Patents
LED driving circuit adopting nonpolar capacitor Download PDFInfo
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- CN109688654B CN109688654B CN201711005003.4A CN201711005003A CN109688654B CN 109688654 B CN109688654 B CN 109688654B CN 201711005003 A CN201711005003 A CN 201711005003A CN 109688654 B CN109688654 B CN 109688654B
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- 239000003990 capacitor Substances 0.000 title claims abstract description 50
- 230000001360 synchronised effect Effects 0.000 claims description 25
- 239000011324 bead Substances 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 11
- 238000002955 isolation Methods 0.000 claims description 9
- 239000000725 suspension Substances 0.000 claims description 7
- 238000007667 floating Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
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- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Abstract
The invention discloses an LED driving circuit adopting a nonpolar capacitor, which adopts a Buck-Boost circuit topology structure, simplifies the traditional conversion circuit, skillfully combines the advantages of the Buck conversion circuit and the Boost conversion circuit in the invention, and simultaneously, the working state of the circuit can be freely switched according to output voltage in two conversion modes according to the need. The invention has the advantages of small volume, long service life, high power factor and high efficiency.
Description
Technical Field
The invention belongs to the field of LED driving power supplies, and relates to an LED driving circuit with a filter capacitor adopting a nonpolar capacitor and a buck-boost circuit topological structure adopted by a conversion circuit.
Background
Today, the development of science and technology is very new, and the LED lighting technology is also rapidly developed as an important ring for promoting energy conservation and environmental protection, and the practicability of the LED driving circuit, which is the core of the LED lighting technology, will also affect the development and popularization of the lighting technology. The basic circuit topology in the LED driving circuit is provided with a Boost, buck, buck-Boost three-conversion circuit, the Boost type driving circuit has the defects that the voltage withstand requirement on a switching device in the converter and an energy storage capacitor of a circuit intermediate stage is high, the volume of a power supply can be increased to a certain extent, the power factor of the Buck type driving circuit is low, the input current is intermittent in one switching period, the normal operation can be realized only when the capacitor voltage of the intermediate stage is lower than the rectified voltage, if the efficiency requirement on the existing Buck-Boost type LED driving circuit is high, the circuit is complex, and the emitter of a switching transistor is not grounded generally, so that the driving circuit is complex. On the other hand, the current LED driving circuit generally adopts an electrolytic capacitor for filtering, and compared with the service life of a common nonpolar capacitor of about 10 ten thousand hours, the normal working time of the electrolytic capacitor is less than 1 ten thousand hours under the environment of higher working temperature, and the current LED driving circuit is also unsuitable if a solid capacitor with low internal resistance is adopted to replace the electrolytic capacitor, because the solid capacitor is limited by a production process, the withstand voltage value is lower, the capacitor capacity is generally smaller, and the low ESR has no obvious advantage. Therefore, if the advantages of the Buck conversion circuit and the Boost conversion circuit are played to the greatest extent, the circuit can be simplified, the cost and the failure rate can be reduced, the power efficiency and the power factor can be improved, the nonpolar common capacitor can be used for replacing the electrolytic capacitor, and the LED driving circuit can meet the requirements of the LED lighting industry.
Disclosure of Invention
The invention is an LED driving power supply, which adopts a Buck-Boost circuit structure, simplifies the circuit, combines the Buck (Buck) circuit structure and Boost (Boost) circuit structure, can freely switch the working states of the circuit in two working modes according to the need, reduces ripple voltage, has MOS tube synchronous driving rectifying circuit, reduces the electric energy loss of the output end, and replaces an electrolytic capacitor with a common capacitor.
The invention provides an LED driving circuit using a nonpolar capacitor, and FIG. 1 is a schematic diagram of an LED driving circuit using a nonpolar capacitor. As shown in fig. 1, the circuit comprises Alternating Current (AC) input ends L and N, a pi-type filter network (1), a diode rectifying circuit (2), an input filter capacitor C1, a main power circuit (m), a MOS tube synchronous driving rectifying circuit (3), a PWM control circuit (4), a high-voltage driving circuit (5), resistors R1, R2 and R3, a voltage feedback loop (6), a current feedback loop (7), an output filter capacitor C2, an output end led+, GND and an LED lamp (LED lamp), wherein the main power circuit (m) comprises switching tubes T1, T2 and T3, resistors R2 and R3, an inductor L, an isolation rectifying diode D1 and a freewheel diode D2. The voltage feedback loop (6) consists of R4 and R5; the current feedback loop consists of R6.
The main power circuit (m) is a Buck-Boost conversion circuit, fully combines the advantages of the Buck conversion circuit and the Boost conversion circuit, reduces ripple parameters of output voltage and current, and simplifies the complex topological structure of the existing Buck-Boost conversion circuit. The D pole (drain electrode) of the switching tube T1 is connected with the positive pole of the output end of the diode rectifying circuit (2), the G pole (grid electrode) of the T1 is connected with the Out output end of the high-voltage driving circuit (5), the S pole (source electrode) of the T1 is connected with one end of the inductor L and the negative pole of the follow current diode D2, the other end of the inductor L is connected with the positive pole of the isolated rectifying diode D1 and the D pole (drain electrode) of the T2, the negative pole of the D1 is connected with the output end LED+ and the load LED lamp bead positive pole, the G pole (grid electrode) of the T2 is connected with the signal output end (Out) of the PWM control circuit (4), and the S pole (source electrode) of the T2 is respectively connected with the sampling resistor R6 and the current sampling port b of the PWM control circuit (4); the G pole (grid) of T3 is connected with the output Out end of the MOS tube synchronous driving rectifying circuit (3), the D pole (drain electrode) of T3 is connected with R2, the other end and R3 of R2 are respectively connected with the positive pole of the output end of the diode rectifying circuit (2), the S pole (source electrode) of T3 is respectively connected with the suspension ground end e of the MOS tube synchronous driving rectifying circuit (3), the other end of the resistor R3 is connected with the starting end (a) of the PWM control circuit (4), and the negative pole of the output end of the diode rectifying circuit (2), the positive pole of the freewheel diode D2 and the negative pole of the load LED lamp bead are connected with the GND end of the output end.
In order to control the interference of the invention to other electronic products and noise or the interference of other electronic products to the invention, a pi-type filter circuit (1) is added on the basis of the main power circuit (m), one end of an inductor L1 is respectively connected with one end of an alternating current input end L and one end of a capacitor C3, the other end of the inductor L1 is respectively connected with one end of an alternating current input end AC of a diode rectifying circuit (2) and one end of a capacitor C4, one end of the inductor L2 is respectively connected with the other ends of the alternating current input end N and the capacitor C3, and the other end of the inductor L1 is respectively connected with the other ends of the alternating current input end AC of the diode rectifying circuit (2) and the capacitor C4.
In order to improve the power factor and reduce the output ripple of the present invention, an input filter capacitor C1 and an output filter capacitor C2 are added on the basis of the above. The two ends of the capacitor C2 are respectively connected with the anode and the cathode of the power supply output, namely connected with the load LED lamp beads in parallel.
As shown in fig. 2, in order to enable the Buck-Boost conversion circuit working mode to be switched freely according to output voltage in the two conversion modes to perform complementary type work, the requirement of replacing an electrolytic capacitor with a common capacitor is met, and a MOS tube synchronous driving rectification circuit (3) is added. The circuit comprises a voltage comparison end f, a grounding end GND, an input end d, an output end Out and a suspension grounding end e, wherein the voltage comparison end f is connected with one end of R1, and the grounding end GND is grounded; the input end D is connected with R4 and R5, the power end Vcc of the PWM control circuit, the high-voltage driving circuit Vcc, the cathode of the output isolation diode D1, C2 and the anode of the load LED lamp bead; the output end Out is connected with the G electrode (grid electrode) of the T3; the floating ground terminal e is respectively connected with the starting terminal a of the PWM control circuit, the S electrode (source electrode) of the T3 and one end of the R3.
The control circuit of the invention is a PWM control circuit and comprises a starting end a, a PWM signal output end Out, a current sampling end b, a power supply end Vcc, a grounding end GND and a voltage feedback end FB. The starting end a is connected with a floating ground end e of the MOS tube synchronous driving rectifying circuit (3), an S electrode (source electrode) of the T3 and one end of the R3, a PWM signal output end Out is connected with an input end IN of the high-voltage driving circuit (5) and an G electrode (grid electrode) of the T2, a current sampling end b is connected with one ends of the S electrode (source electrode) of the T2 and the R6, a power end Vcc is respectively connected with input ends D, R4 and R5 of the MOS tube synchronous driving rectifying circuit (3), a power end Vcc of the high-voltage driving circuit, a negative electrode of the output isolation diode D1, a positive electrode of the C2 and a load LED lamp bead, a grounding end GND is grounded, and a voltage feedback end FB is connected with one end of the R4.
IN order to meet the design requirement of the large circuit output stage with the shortest circuit cross conduction time, the MOS transistor working IN a high-voltage state is directly driven. The power supply end Vcc is connected with input ends D, R4 and R5 of the MOS tube synchronous driving rectifying circuit (3), the PWM control circuit Vcc, the negative electrode of the output isolation diode D1, the negative electrode of the C2 and the positive electrode of the load LED lamp bead, the grounding end GND is grounded, the input end IN is connected with the output ends Out of the PWM control circuit and the G electrode (grid electrode) of the T2, the output end Out is connected with the G electrode (grid electrode) of the T1, and the high-voltage suspension ground end C is connected with the S electrode (source electrode) of the inductor L, T and the negative electrode of the follow current diode D2.
In order to further improve the working performance of the invention and reduce ripple, an output voltage feedback loop (6) and a current feedback loop (7) are added in the circuit. The output voltage feedback loop (6) comprises R4, R5 and a voltage feedback end (FB) of the PWM control circuit (4), one end of the R4 is connected with the FB, the other end of the R4 is connected with the R5, an input end d of the MOS tube synchronous driving rectifying circuit (3) and a power output positive electrode (LED+), the other end of the R4 is connected with the R5, the other end of the R5 is connected with a grounding end GND of the power supply, the current feedback loop (7) comprises a sampling resistor R6 and a current sampling end b of the PWM control circuit (4), one end of the R6 is connected with an S electrode (source electrode) of the T2 and the current sampling end b of the PWM control circuit (4), and the other end of the R6 is connected with the grounding end GND of the invention.
Drawings
FIG. 1 is a schematic diagram of an LED driver circuit employing a nonpolar capacitor
Reference numerals in the figures
1. Pi-type filter network
2. Diode rectifying circuit
3 MOS tube synchronous driving rectifying circuit
4 PWM control circuit
5. High-voltage driving circuit
6. Voltage feedback loop
7. Current feedback loop
FIG. 2 is a schematic diagram of a voltage control circuit
Detailed Description
When the alternating current enters the circuit from L, N, the alternating current is filtered by a pi-type filter circuit (1), then is rectified and filtered by a diode rectifying circuit (2) and a capacitor C1, the voltage waveform at the moment reaches a starting end a of a PWM control circuit through a starting resistor R3, the PWM control circuit is started and then compares a voltage signal fed back by a voltage feedback loop with an a-end voltage signal, PWM pulse with a certain duty ratio is output from a PWM signal output end, the pulse is divided into two paths, one path enters an input end IN of a high-voltage driving circuit, a switching tube T1 is driven to be a high-voltage driving end after being output by the high-voltage driving circuit, and the other path directly drives a switching tube T2 to be a low-voltage driving end. Meanwhile, in the MOS tube synchronous rectification circuit, when the voltage waveform after passing through the diode rectification circuit and the capacitor C1 is acquired by the voltage comparison end f, when the voltage is higher than the voltage value set by the circuit, the high-voltage driving circuit Out end drives the switching tube T1 to carry Out Buck (Buck) operation, when the Buck operation is carried Out, the switching tube T1 works, the working current passes through the inductor L and then charges C2 through the isolation diode D1 to supply power to the load LED, when the voltage is lower than the voltage value set by the circuit, the high-voltage driving end drives the switching tube T1, the low-voltage driving end drives the switching tube T2, the two work simultaneously, boost (Boost) operation is carried Out, the working current passes through the inductor L after passing through the switching tube T1, when PWM driving signals output by the high-voltage driving end and the low-voltage driving end are in a low level (namely at the moment when the T1 and the T2 are closed), the inductor L, the isolation diode D1, the capacitor C2 and the flywheel diode D2 form a loop, and the MOS tube synchronous driving circuit is used for charging C2 by electric energy stored in the inductor L, and meanwhile, when the MOS tube synchronous driving circuit acquires the voltage output end and controls the switching tube T2 to carry Out on-off and composite operation when the voltage output end is controlled.
The specific implementation mode of the MOS tube synchronous driving circuit is as follows: when the input end d detects the output voltage of the positive electrode of the power output end, the LED in the optocoupler is conducted, the photoelectric tube VT is conducted, the voltage comparison end f collects the voltage waveform after passing through the diode rectifying circuit (2) and the capacitor C1, when the voltage of the end f is higher than the voltage of the end e of the floating ground, the output end Out outputs high level, the synchronous rectifying switch tube T3 is conducted, when the voltage of the end f is lower than the voltage of the end e of the floating ground, the output end Out outputs low level, the synchronous rectifying switch tube T3 is turned off, and the MOS tube drives the rectifying circuit to enable the switch tube T2 and the synchronous rectifying switch tube T3 to conduct complementary operation.
Claims (1)
1. An LED driving circuit adopting a nonpolar capacitor is characterized in that the LED driving circuit consists of Alternating Current (AC) input ends L and N, a pi-type filter network (1), a diode rectifying circuit (2), an input filter capacitor C1, a main power circuit (m), a MOS tube synchronous driving rectifying circuit (3), a PWM control circuit (4), a high-voltage driving circuit (5), a voltage feedback loop (6), a current feedback loop (7), an output filter capacitor C2, an output end LED+, GND and LED lamp beads, wherein the main power circuit (m) consists of switching tubes T1, T2 and T3, resistors R2 and R3, an inductor L, an isolation rectifying diode D1 and a freewheel diode D2, and the voltage feedback loop (6) consists of R4 and R5; the current feedback loop (7) consists of R6;
the D pole (drain electrode) of the switch tube T1 is connected with the positive pole of the output end of the diode rectifying circuit (2), the G pole (grid electrode) of the T1 is connected with the output end Out of the high-voltage driving circuit (5), the S pole (grid electrode) of the T1 is connected with one end of an inductance L and the negative pole of a free-wheeling diode D2, the other end of the inductance L is connected with the positive pole of the isolation rectifying diode D1 and the D pole (drain electrode) of the T2, the negative pole of the D1 is connected with the output end LED+ and the positive pole of a load LED lamp bead, the G pole (grid electrode) of the T2 is connected with the signal output end Out of the PWM control circuit (4), the S pole (source electrode) of the T2 is connected with a sampling resistor R6 and a current sampling port b of the PWM control circuit (4), the G pole (grid electrode) of the T3 is connected with the output end Out of the MOS tube synchronous driving rectifying circuit (3), the other end of the T3 is connected with one end of the resistors R2, the other end of the resistor R2 is connected with the positive pole of the diode rectifying circuit (2), one end of the other end of the resistor R3 is connected with the output end of the MOS tube synchronous rectifying circuit (3) is connected with the output end Out of the MOS tube synchronous driving circuit (3), the cathode of the output end of the diode rectifying circuit (2), the anode of the follow current diode D2 and the cathode of the load LED lamp bead are respectively connected with the GND end of the LED driving circuit;
one end of an inductor L1 is respectively connected with one end of an alternating current input end L and one end of a capacitor C3, the other end of the inductor L1 is respectively connected with one end of an alternating current input end of a diode rectifying circuit (2) and one end of a capacitor C4, one end of the inductor L2 is respectively connected with the other end of the alternating current input end N and the other end of the capacitor C3, and the other end of the inductor L2 is respectively connected with the other alternating current input end of the diode rectifying circuit (2) and the other end of the capacitor C4;
the two ends of the input filter capacitor C1 are respectively connected with the positive electrode and the negative electrode of the output end of the diode rectifying circuit (2); one end of the inductor L is respectively connected with an S pole (source electrode) of the switching tube T1 and a GND end of the LED driving circuit, and a D pole (drain electrode) of the switching tube T1 is respectively connected with one end of the resistor R1, the other end of the resistor R2, one end of the resistor R3 and the positive electrode of the output end of the diode rectifying circuit (2); one end of the capacitor C2 is connected with the GND of the LED driving circuit, and the other end of the capacitor C2 is connected with the positive electrode of the output end of the diode rectifying circuit (2), namely the capacitor C2 is connected with the load LED lamp beads in parallel;
the MOS tube synchronous driving rectification circuit comprises a voltage comparison end f, a grounding end GND, an input end D, an output end Out and a suspension ground end e, wherein the voltage comparison end f is connected with the other end of the R1, the grounding end GND is grounded, the input end D is respectively connected with one end of the R4, one end of the R5, a power end Vcc of the PWM control circuit, a power end Vcc of the high-voltage driving circuit, a negative electrode of the isolated rectifying diode D1, one end of the capacitor C2 and a positive electrode of the load LED lamp bead, the output end Out is connected with the G electrode of the T3, and the suspension ground end e is respectively connected with the starting ends a and S electrodes of the PWM control circuit and one end of the R3;
the PWM control circuit comprises a starting end a, a PWM signal output end Out, a current sampling end b, a power end Vcc, a grounding end GND and a voltage feedback end FB, wherein the starting end a is respectively connected with a floating grounding end e and an S pole of a T3 of the MOS tube synchronous driving rectifying circuit and one end of a resistor R3, the PWM signal output end Out is respectively connected with an input end IN and a G pole of a T2 of the high-voltage driving circuit, the current sampling end b is respectively connected with an S pole of the T2 and one end of a R6, the power end Vcc is respectively connected with an input end D of the MOS tube synchronous driving rectifying circuit (3), one end of a resistor R4, one end of a resistor R5, the power end Vcc of the high-voltage driving circuit, the cathode of an isolation rectifying diode D1, one end of a capacitor C2 and the anode of a load LED lamp bead, the grounding end GND is grounded, and the voltage feedback end FB is connected with the other end of the resistor R4;
the high-voltage driving circuit comprises a power end Vcc, a grounding end GND, an input end IN, an output end Out and a high-voltage suspension ground end C, wherein the power end Vcc is respectively connected with an input end D of a MOS tube synchronous driving rectifying circuit (3), one end of a resistor R4, one end of a resistor R5, the power end Vcc of a PWM control circuit, the negative electrode of an isolated rectifying diode D1, one end of a capacitor C2 and the positive electrode of a load LED lamp bead, the grounding end GND is grounded, the input end IN is respectively connected with a PWM signal output end Out of the PWM control circuit and the G electrode (grid electrode) of T2, the output end Out is connected with the G electrode (grid electrode) of T1, the high-voltage suspension ground end C is respectively connected with one end of an inductor L and the negative electrode of a freewheeling diode D2, and the positive electrode of the freewheeling diode D2 is connected with the S electrode (source electrode) of T1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711005003.4A CN109688654B (en) | 2017-10-19 | 2017-10-19 | LED driving circuit adopting nonpolar capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711005003.4A CN109688654B (en) | 2017-10-19 | 2017-10-19 | LED driving circuit adopting nonpolar capacitor |
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| Publication Number | Publication Date |
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| CN109688654A CN109688654A (en) | 2019-04-26 |
| CN109688654B true CN109688654B (en) | 2023-12-12 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6201714B1 (en) * | 1999-11-09 | 2001-03-13 | Skynet Electronics Co., Ltd. | Exchanging converter having a zero-voltage switching control circuit for driving an output voltage filter capacitor to partially feed back storage energy to an input side of the transformer or storage inductor |
| CN102612225A (en) * | 2012-03-06 | 2012-07-25 | 广州金升阳科技有限公司 | Power circuit capable of being used for LED drive |
| CN105592596A (en) * | 2016-03-08 | 2016-05-18 | 李香龙 | Common capacitor buck-boost LED driving power supply |
| CN205622914U (en) * | 2016-03-08 | 2016-10-05 | 李香龙 | LED drive power supply is pressed in ordinary condenser falling -rising |
| CN106535402A (en) * | 2016-11-22 | 2017-03-22 | 福州大学 | Single-stage single-switch voltage-reducing type leakage inductor energy utilization LED driving circuit |
-
2017
- 2017-10-19 CN CN201711005003.4A patent/CN109688654B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6201714B1 (en) * | 1999-11-09 | 2001-03-13 | Skynet Electronics Co., Ltd. | Exchanging converter having a zero-voltage switching control circuit for driving an output voltage filter capacitor to partially feed back storage energy to an input side of the transformer or storage inductor |
| CN102612225A (en) * | 2012-03-06 | 2012-07-25 | 广州金升阳科技有限公司 | Power circuit capable of being used for LED drive |
| CN105592596A (en) * | 2016-03-08 | 2016-05-18 | 李香龙 | Common capacitor buck-boost LED driving power supply |
| CN205622914U (en) * | 2016-03-08 | 2016-10-05 | 李香龙 | LED drive power supply is pressed in ordinary condenser falling -rising |
| CN106535402A (en) * | 2016-11-22 | 2017-03-22 | 福州大学 | Single-stage single-switch voltage-reducing type leakage inductor energy utilization LED driving circuit |
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| CN109688654A (en) | 2019-04-26 |
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