CN201667747U - High-efficiency LED street lamp drive circuit - Google Patents
High-efficiency LED street lamp drive circuit Download PDFInfo
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- CN201667747U CN201667747U CN 201020121481 CN201020121481U CN201667747U CN 201667747 U CN201667747 U CN 201667747U CN 201020121481 CN201020121481 CN 201020121481 CN 201020121481 U CN201020121481 U CN 201020121481U CN 201667747 U CN201667747 U CN 201667747U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/72—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps in street lighting
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Abstract
The utility model relates to a high-efficiency LED street lamp drive circuit which is connected between an AC input end and a DC output end of a circuit board; an LED lamp string is connected with the DC output end; the high-efficiency LED street lamp drive circuit comprises a rectification filtering unit, a PFC unit, a feedback unit and an output voltage-stabilizing filtering unit, wherein the PFC unit comprises a PFC control chip, a PFC switching device and a PFC inductance; the output voltage-stabilizing filtering unit comprises a voltage-stabilizing tube and an energy-storage filter capacitor; an input end of the rectification filtering unit is connected with the AC input end; one end of the PFC inductance is connected with an output end of the rectification filtering unit, and the other end thereof is connected with a positive pole of the voltage-stabilizing tube; a negative pole of the voltage-stabilizing tube is connected with a positive pole of the DC output end; a positive pole of the energy-storage filter capacitor is connected with the negative pole of the voltage-stabilizing tube, and a negative pole thereof is connected with an earthing wire; the PFC control chip is connected with the PFC switching device which is connected with the positive pole of the voltage-stabilizing tube; and an input end of the feedback unit is connected with the DC output end, and an output end thereof is connected with the PFC control chip. The high-efficiency LED street lamp drive circuit has simple structure and high efficiency.
Description
Technical field
The utility model relates to the LED lighting field, and is especially relevant with high-efficiency LED street lamp drive circuit.
Background technology
The LED street lamp generally includes: housing, be arranged on the LED lamp plate in the housing, the cooling system of giving the heat radiation of LED lamp plate and the circuit board of driving LED lamp plate work.Circuit board is provided with ac input end AC
IN, dc output end DC
OUTAnd be connected ac input end AC
INWith dc output end DC
OUTBetween drive circuit, ac input end AC
INLink to each other dc output end DC with utility grid
OUTLink to each other with the LED lamp string on the LED lamp plate.Tradition LED street lamp drive circuit as shown in Figure 1, it mainly comprises rectification filtering unit 1, PFC (Power Factor Correction, power factor correction) three parts such as unit 2 and step-down isolated location 3, the input of rectification filtering unit 1 and ac input end AC
INOutput continuous, rectification filtering unit 1 links to each other with an end of PFC inductance L 1, and the other end of PFC inductance L 1 links to each other with PFC unit 2; PFC unit 2 comprises PFC control chip 21 and PFC switching device 22; Step-down isolated location 3 comprises transformer 31, PWM (Pulse Width Modulation, pulse-width modulation) unit 32, transformer secondary rectification unit 33 and feedback unit 34, PWM unit 32 comprises pwm chip 321 and PWM switching device 322 again, at dc output end DC
OUTPositive pole and negative pole between also be connected with energy storage filter capacitor C2.The operation principle of this circuit is: by rectification filtering unit 1 alternating current is made into direct current, carry out power factor correction by PFC unit 2 afterwards, by PWM unit 32 direct current is become the former limit that alternating current is added in transformer 31 then, through the transformer step-down, after 33 rectifications of transformer secondary rectification unit, export low-voltage dc signal DC again
OUT, feedback circuit 34 is connected low-voltage dc signal DC
OUTAnd between the PWM unit 32, it is in order to guarantee the stable low-voltage dc signal DC of transformer 31 outputs
OUT
The shortcoming of this drive circuit is: this circuit causes circuit efficiency low through PFC unit and step-down isolated location two-stage voltage transitions, and volume is big, the cost height; Isolated led drive circuit gross efficiency is about 60%-86%, and efficient is low, is seriously restricting the light efficiency of the whole light fixture of LED, makes the LED light fixture under present stage not obvious compared with the advantage of other light fixtures.
Summary of the invention
The technical problems to be solved in the utility model provides a kind of simple in structure, high-efficiency LED street lamp drive circuit that efficient is high.
For solving the problems of the technologies described above, the utility model provides a kind of high-efficiency LED street lamp drive circuit, it is connected between the ac input end and dc output end of circuit board, LED lamp string links to each other with dc output end, comprise: rectification filtering unit, the PFC unit, feedback unit and output voltage regulation filtering unit, described PFC unit comprises the PFC control chip, PFC switching device and PFC inductance, output voltage regulation filtering unit comprises a voltage-stabiliser tube and an energy storage filter capacitor, the input of described rectification filtering unit links to each other with described ac input end, one end of described PFC inductance links to each other with the output of described rectification filtering unit, the other end of described PFC inductance links to each other with the positive pole of described voltage-stabiliser tube, the negative pole of described voltage-stabiliser tube links to each other with the positive pole of described dc output end, the positive pole of described energy storage filter capacitor links to each other with the negative pole of described voltage-stabiliser tube, the negative pole of described energy storage filter capacitor links to each other with earth connection, described PFC control chip links to each other with described PFC switching device, described PFC switching device links to each other with the positive pole of described voltage-stabiliser tube, the input of described feedback unit links to each other with described dc output end, and the output of described feedback unit links to each other with described PFC control chip.
Described high-efficiency LED street lamp drive circuit, wherein, described feedback unit comprises a pressure limiting module and a constant flow module, and the input of described pressure limiting module links to each other with the positive pole of described dc output end, and output links to each other with described PFC control chip; The input of described constant flow module links to each other with described LED lamp string, and output links to each other with described PFC control chip; Described pressure limiting module also links to each other with earth connection respectively with described constant flow module.
Useful technique effect of the present utility model is: the efficient height of this led drive circuit, and constant current is effective, drives compared with common LED, and its light efficiency has promoted 10LM/W, has promoted the process of LED light fixture replacement conventional lamp.
Description of drawings
Fig. 1 is the frame structure schematic diagram of existing LED street lamp drive circuit;
Fig. 2 is the frame structure schematic diagram of the utility model LED street lamp drive circuit;
Fig. 3 is the circuit element figure of LED street lamp drive circuit shown in Figure 2;
Fig. 4 a, Fig. 4 b are respectively in a line cycle waveform schematic diagram of electric current and voltage on the PFC inductance L 3.
Embodiment
For further setting forth the utility model is technological means and the effect that the predetermined purpose of realization is taked, the utility model will be elaborated in conjunction with above-mentioned accompanying drawing, the purpose of this utility model, feature and characteristics, can obtain thus going deep into and concrete understanding, yet accompanying drawing only provides reference and explanation usefulness, is not to be used for the utility model is limited.
Consult Fig. 2, high-efficiency LED street lamp drive circuit is connected the ac input end AC of circuit board
INWith dc output end DC
OUTBetween, LED lamp string 4 and dc output end DC
OUTLink to each other.High-efficiency LED street lamp drive circuit comprises: rectification filtering unit 1, PFC unit 2, feedback unit 3 and output voltage regulation filtering unit.PFC unit 2 comprises PFC control chip 21, PFC switching device 22 and PFC inductance L 3.Output voltage regulation filtering unit comprises a voltage-stabiliser tube D4 and an energy storage filter capacitor C7, the input of rectification filtering unit 1 and ac input end AC
INLink to each other, an end of PFC inductance L 3 links to each other with the output of rectification filtering unit 1, and the other end of PFC inductance L 3 links to each other with the positive pole of voltage-stabiliser tube D4, the negative pole of voltage-stabiliser tube D4 and dc output end DC
OUTPositive pole link to each other, the positive pole of energy storage filter capacitor C7 links to each other with the negative pole of voltage-stabiliser tube D4, the negative pole of energy storage filter capacitor C7 links to each other with earth connection, PFC control chip 21 links to each other with PFC switching device 22, PFC switching device 22 links to each other with the positive pole of voltage-stabiliser tube D4.
Fig. 3 is a specific embodiment of LED street lamp drive circuit block diagram shown in Figure 2, consult Fig. 3, the acp chip that PFC control chip 21 adopts is L6562, it is the PFC control chip of the quasi-continuous pattern of an electric current (TM pattern), it is the critical point that the electric current of PFC inductance L 3 is in continuous mode and discontinuous mode, its operation principle is as follows: at first control chip L6562 generates the reference signal of an inductive current, switching tube Q1 conducting when each switch periods begins, the electric current of PFC inductance L 3 is linear to be increased, then the current detection signal of PFC inductance L 3 is compared with reference signal, when the current detection value of PFC inductance L 3 equals the inductive current reference value, switching tube Q1 turn-offs, and PFC inductance L 3 electric currents reduce, when inductive current reduces to zero, switching tube Q1 conducting more so goes round and begins again.The reference signal of the electric current of PFC inductance L 3 is subtracted each other by the detected value and the set-point of feedback unit, again via the pi regulator of L6562 chip internal, the boost circuit input voltage waveform of the output of the pi regulator of L6562 chip internal and rectifier bridge DB1 rear end is multiplied each other obtains then.Because PFC inductance L 3 current reference signals are by the feedback loop decision of feedback unit, so be to keep system stability and obtain high power factor, the parameter of feedback unit cooperates very important with L6562.Fig. 4 a, Fig. 4 b have provided in the line cycle oscillogram of electric current and voltage on the PFC inductance L 3.Actual by the electric current on the PFC inductance L 3 is triangular wave, its envelope is the reference signal of electric current on the PFC inductance L 3, because the reference signal of electric current is the product of the output of voltage error amplifier and the boost circuit input voltage waveform after the rectification on the PFC inductance L 3, and when system stability is worked, the output substantially constant of error amplifier is so the envelope of electric current is sinusoidal wave substantially on the PFC inductance L 3.According to the triangle area formula, can get the mean value of electric current on the PFC inductance L 3, promptly the mean value of electric current is sinusoidal wave on the PFC inductance L 3.Owing to the HFS of the filter capacitor that is parallel to rectifier bridge DB1 rear end with the electric current on the inductance L 3 filters, so the input current of system is sinusoidal wave, and phase place is consistent with supply voltage, and the system power factor is near 1.
Introduce the working method of feedback unit 3 below:
When the electric current that flows through LED lamp two ends is excessive, convert out the voltage of an overgauge value by sample resistance R17, close filtering by resistance R 17 and capacitor C 13 lotus roots, compare with the 3 pin reference voltages of amplifier IC3B, if the 2 pin voltages of amplifier IC3B are greater than the 3 pin voltages of amplifier IC3B, the 1 pin output low level of amplifier IC3B then, at this moment, triode Q2 conducting, VCC voltage is by resistance R 12, resistance R 14 and triode Q2 (the CE utmost point of Q2) dividing potential drop, voltage that is higher than benchmark of the last generation of R14,1 pin that is coupled to the L6562 chip by R10,1 pin turn-offs switching tube Q1 by its internal circuit, so repeats, and always reduces to flow through the electric current of LED.Otherwise, if flow through the electric current at LED two ends too small the time, the 1 pin output high level of amplifier IC3B, triode Q2 ends, resistance R 10 is coupled to the voltage of L6562 chip 1 pin less than reference voltage, and switching tube Q1 conducting increases the ON time of switching tube Q1 with this, electric current and the effective value of time on the PFC inductance L 3 are increased, thereby increase the electric current that flows through the LED lamp.
When the LED loop disconnects or exports zero load, output voltage is too high, output voltage is through divider resistance R22, R23, R21 dividing potential drop, the input voltage of 6 pin that makes amplifier IC3A is greater than the reference voltage of 5 pin, the 7 pin output LOW voltages of IC3A then, triode Q2 conducting, the voltage that is coupled to by R10 on 1 pin of L6562 chip is higher than reference voltage, the duty ratio of the 7 pin output of L6562 chip reduces, thus the restriction output voltage.
The above only is a preferable possible embodiments of the present utility model; and unrestricted protection range of the present utility model; rectification filtering unit 1 in the utility model, PFC unit 2, feedback unit 3 and output voltage regulation filtering unit also can adopt other general in this area circuit structures respectively; the equivalent structure that all utilization the utility model specifications and accompanying drawing content have been done changes, and all is included in the protection range of the present utility model.
Claims (2)
1. high-efficiency LED street lamp drive circuit, it is connected between the ac input end and dc output end of circuit board, LED lamp string links to each other with dc output end, it is characterized in that, comprise: rectification filtering unit, the PFC unit, feedback unit and output voltage regulation filtering unit, described PFC unit comprises the PFC control chip, PFC switching device and PFC inductance, output voltage regulation filtering unit comprises a voltage-stabiliser tube and an energy storage filter capacitor, the input of described rectification filtering unit links to each other with described ac input end, one end of described PFC inductance links to each other with the output of described rectification filtering unit, the other end of described PFC inductance links to each other with the positive pole of described voltage-stabiliser tube, the negative pole of described voltage-stabiliser tube links to each other with the positive pole of described dc output end, the positive pole of described energy storage filter capacitor links to each other with the negative pole of described voltage-stabiliser tube, the negative pole of described energy storage filter capacitor links to each other with earth connection, described PFC control chip links to each other with described PFC switching device, described PFC switching device links to each other with the positive pole of described voltage-stabiliser tube, the input of described feedback unit links to each other with described dc output end, and the output of described feedback unit links to each other with described PFC control chip.
2. high-efficiency LED street lamp drive circuit as claimed in claim 1, it is characterized in that, described feedback unit comprises a pressure limiting module and a constant flow module, and the input of described pressure limiting module links to each other with the positive pole of described dc output end, and output links to each other with described PFC control chip; The input of described constant flow module links to each other with described LED lamp string, and output links to each other with described PFC control chip; Described pressure limiting module also links to each other with earth connection respectively with described constant flow module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020121481 CN201667747U (en) | 2010-01-29 | 2010-01-29 | High-efficiency LED street lamp drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020121481 CN201667747U (en) | 2010-01-29 | 2010-01-29 | High-efficiency LED street lamp drive circuit |
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|---|---|
| CN201667747U true CN201667747U (en) | 2010-12-08 |
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|---|---|---|---|
| CN 201020121481 Expired - Fee Related CN201667747U (en) | 2010-01-29 | 2010-01-29 | High-efficiency LED street lamp drive circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386661A (en) * | 2011-12-07 | 2012-03-21 | 中国人民解放军总装备部军械技术研究所 | Portable electrifying, charging and discharging equipment for photoelectric device |
| CN102523406A (en) * | 2011-12-07 | 2012-06-27 | 青岛海信电器股份有限公司 | Power circuit structure and LED liquid crystal television |
| CN102781147A (en) * | 2012-08-16 | 2012-11-14 | 广东良得电子科技有限公司 | LED (Light-emitting diode) power supply circuit with high power factor |
| CN102869145A (en) * | 2011-07-09 | 2013-01-09 | 深圳市万禧节能科技有限公司 | LED (light emitting diode) driving power supply |
| CN103002638A (en) * | 2012-10-31 | 2013-03-27 | 芜湖崧欣电子科技有限公司 | Led drive circuit |
| WO2015196893A1 (en) * | 2014-06-23 | 2015-12-30 | 深圳彩芯智科技有限公司 | Led lamp string control circuit and led lamp string controller |
| CN108012370A (en) * | 2017-11-22 | 2018-05-08 | 中山市深力卓光电科技有限公司 | The LED drive power of no electrolytic capacitor |
-
2010
- 2010-01-29 CN CN 201020121481 patent/CN201667747U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102869145A (en) * | 2011-07-09 | 2013-01-09 | 深圳市万禧节能科技有限公司 | LED (light emitting diode) driving power supply |
| CN102386661A (en) * | 2011-12-07 | 2012-03-21 | 中国人民解放军总装备部军械技术研究所 | Portable electrifying, charging and discharging equipment for photoelectric device |
| CN102523406A (en) * | 2011-12-07 | 2012-06-27 | 青岛海信电器股份有限公司 | Power circuit structure and LED liquid crystal television |
| CN102523406B (en) * | 2011-12-07 | 2014-01-08 | 青岛海信电器股份有限公司 | Power circuit structure and LED liquid crystal television |
| CN102781147A (en) * | 2012-08-16 | 2012-11-14 | 广东良得电子科技有限公司 | LED (Light-emitting diode) power supply circuit with high power factor |
| CN102781147B (en) * | 2012-08-16 | 2014-10-01 | 广东良得光电科技有限公司 | LED (Light-emitting diode) power supply circuit with high power factor |
| CN103002638A (en) * | 2012-10-31 | 2013-03-27 | 芜湖崧欣电子科技有限公司 | Led drive circuit |
| WO2015196893A1 (en) * | 2014-06-23 | 2015-12-30 | 深圳彩芯智科技有限公司 | Led lamp string control circuit and led lamp string controller |
| CN108012370A (en) * | 2017-11-22 | 2018-05-08 | 中山市深力卓光电科技有限公司 | The LED drive power of no electrolytic capacitor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101208 Termination date: 20180129 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |