CN102917512A - Method for improving power factor of LED (Light Emitting Diode) power supply circuit - Google Patents
Method for improving power factor of LED (Light Emitting Diode) power supply circuit Download PDFInfo
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- CN102917512A CN102917512A CN2012104388939A CN201210438893A CN102917512A CN 102917512 A CN102917512 A CN 102917512A CN 2012104388939 A CN2012104388939 A CN 2012104388939A CN 201210438893 A CN201210438893 A CN 201210438893A CN 102917512 A CN102917512 A CN 102917512A
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- 238000004804 winding Methods 0.000 claims abstract description 16
- 238000005070 sampling Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000006698 induction Effects 0.000 claims description 5
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- 230000009286 beneficial effect Effects 0.000 description 1
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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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
A method for improving the power factor of an LED (Light Emitting Diode) power supply circuit is characterized by comprising the following four steps of: firstly, cancelling a voltage and current feedback unit and an photoelectric coupler; secondly, changing a voltage signal sampling circuit, wherein sampling of voltage signals at a positive pole of output voltage through resistors R14 and R15 at a secondary side T1-C of a voltage transformer originally is changed into indirect sampling of output voltage through a primary feedback winding T1-B of the voltage transformer and resistors R5 and R6; thirdly, changing a current signal sampling circuit, wherein sampling of current signals of output current through a resistor RCS1 at the secondary side of the voltage transformer originally is changed into sampling through a resistor RCS at a primary side of the voltage transformer; and fourthly, selecting an LED drive chip MT7930 with integrated power factor calibration as a control circuit. The power supply is especially suitable for being matched with a low-power LED illuminating lamps. The LED power supply circuit has the advantages of high power factor and efficiency, electric energy economization, simple structure, small volume, low cost, etc.
Description
Technical field
The present invention relates to improving one's methods of a kind of LED of raising power circuit power factor.
Background technology
LED is as a kind of brand-new lighting system, has a life-span long, consumes energy low, and without mercury pollution, the advantages such as applying flexible are widely used in the fields such as urban afforestation illumination and indoor and outdoor lighting.According to the traditional approach small-power power, 7-15 watt circuit particularly, obtain higher power factor, the APC-12 series power supply of the at present most bright latitude of LED power supply such as Taiwan enterprise clothes part Co., Ltd's production, adopt single-stage Active PFC and secondary feedback to realize the scheme of constant current output control, need to adopt photoelectric coupled device and secondary feedback control circuit, increased volume and cost, be unfavorable for the realization of the target of LED product miniaturization.Through retrieval and market survey, do not find to use the combination of former limit feedback and single-stage Active PFC to realize that the LED power circuit related data and the material object that improve power factor appear on the market.
Summary of the invention
The technical problem to be solved in the present invention is to provide improving one's methods of a kind of LED of raising power circuit power factor.
Solving the problems of the technologies described above the technical scheme that adopts is:
(1) feedback of voltage and current unit and photoelectrical coupler have been cancelled;
(2) changed the sample circuit of voltage signal, voltage signal by original by at Circuit Fault on Secondary Transformer T
1-CResistance R
14, R
15To the anodal sampling of output voltage, change to by primary feedback winding T
1-BAnd resistance R
5, R
6Indirectly to the output voltage sampling, for this reason with R
5One end is connected to primary feedback winding T
1-BAnode, the other end is connected to the auxiliary winding voltage feedback of control chip U pin 6, resistance R
6With capacitor C
4An end in parallel is connected to the auxiliary winding voltage feedback of control chip U pin 6, other end ground connection;
(3) changed the sample circuit of current signal, current signal by original by the resistance R in transformer two sides
CS1Output current is taken a sample, change to by the resistance R to the transformer primary side
CSSampling is for this reason with R
CSOne end ground connection, drain electrode and the resistance R of the other end and power switch pipe Q
8Link to each other R
8The other end connects control chip U electric current induction pin 8;
(4) changed the driving chip of LED, the pulse frequency adjuster L6562 with multiplier by the STMicw Electronics (ST) of former usefulness, change the LED driving chip MT7930 that selects the integrated power factor correcting into and make control circuit, the annexation of each pin of this control chip U is:
DRV external power grid drives pin 1, passes through R
9Be connected to the canopy utmost point of power switch pipe Q;
The output pin 4 of COMP internal error amplifier passes through capacitor C
3Ground connection;
STP starts pin 5 and is connected to the output that resistance is controlled IC power supply unit 6 with VDD supply pin 7;
The auxiliary winding voltage feedback of DSEN pin 6, wherein resistance R
5One end is connected to primary feedback winding T
1-BAnode, the other end is connected to 6 pin of control chip U, resistance R
6With capacitor C
4An end in parallel is connected to 6 pin of control chip U, other end ground connection;
CS electric current induction pin 8 passes through resistance R
8The drain electrode and the sample resistance R that connect power switch pipe Q
CSOne end, resistance R
CSOther end ground connection.
The invention has the beneficial effects as follows: since use the LED of integrated power factor correcting drive chip and with the combination of former limit feedback circuit structure, improved power factor, saves energy, simplification circuit and reduced device and reduced cost.
Description of drawings
Fig. 1 is the circuit block diagram of the LED power supply of prior art;
The circuit block diagram of the LED power supply of Fig. 2 after for this improvement;
Fig. 3 is the circuit theory diagrams of the LED power supply of prior art;
The circuit theory diagrams of the LED power supply of Fig. 4 after for this improvement.
Embodiment
The present invention is described in detail below in conjunction with embodiment and with reference to accompanying drawing:
As shown in Figure 1, the LED power circuit of prior art comprises input power supply unit 1, power conversion unit 2, output unit 3, feedback of voltage and current unit 4, control unit 5 and control IC power supply unit 6.
As shown in Figure 2, the LED power circuit after the improvement comprises input power supply unit 1, power conversion unit 2, output unit 3, control unit 5, control IC power supply unit 6.Cancelled feedback of voltage and current unit 4 from structure.
It is core that control unit 5 selects the LED of integrated power factor correcting to drive chip MT7930, and the annexation of each pin of chip U is:
DRV external power grid drives pin 1, passes through R
9Be connected to the canopy utmost point of power switch pipe Q, the voltage and current signal of control chip U by detecting, output drive signal power ratio control switching tube Q after relatively adjusting is to guarantee the stable of output;
The output pin 4 of COMP internal error amplifier passes through capacitor C
3Be connected to ground, improve control chip U to the adjustment of power factor by regulating building-out capacitor, reasonably arrange and to obtain higher power factor;
STP starts pin 5 and is connected to the output that resistance is controlled the IC power supply unit with VDD supply pin 7, satisfies the continued power of IC;
The auxiliary winding voltage feedback of DSEN pin 6, wherein resistance R
5The elementary feedback winding of one end connection transformer T
1-BAnode, the other end connects 6 pin of control chip U, resistance R
6With capacitor C
4An end connects 6 pin of control chip U after in parallel, and other end ground connection is by divider resistance R
5And R
6Detection obtains the auxiliary winding T of primary
BVoltage, obtain again the output voltage of output unit 3 by the turn ratio relation of transformer, control chip U relatively obtains voltage error signal by voltage and the internal comparator that detects, control thus output voltage, saved the secondary voltage feedback element, this voltage signal has also reacted input voltage waveform, for the corrected power factor provides voltage signal;
CS electric current induction pin 8 passes through resistance R
8Be connected to drain electrode and the sample resistance R of power switch pipe Q
CSOne end, resistance R
CSOther end ground connection, control chip U passes through resistance R
8Detect primary current signal, relatively obtain current error signal through internal comparator, control thus output current, saved the secondary current feedback element, this current signal has also reacted input current waveform, for the corrected power factor provides current signal.
Claims (1)
1. one kind is improved improving one's methods of LED power circuit power factor, it is characterized in that taking following four main measures:
(1) feedback of voltage and current unit and photoelectrical coupler have been cancelled;
(2) changed the sample circuit of voltage signal, voltage signal by original by at Circuit Fault on Secondary Transformer T
1-CResistance R
14, R
15To the anodal sampling of output voltage, change to by primary feedback winding T
1-BAnd resistance R
5, R
6Indirectly to the output voltage sampling, for this reason with R
5One end is connected to primary feedback winding T
1-BAnode, the other end is connected to the auxiliary winding voltage feedback of control chip U pin 6, resistance R
6With capacitor C
4An end in parallel is connected to the auxiliary winding voltage feedback of control chip U pin 6, other end ground connection;
(3) changed the sample circuit of current signal, current signal by original by the resistance R in transformer two sides
CS1Output current is taken a sample, change to by the resistance R to the transformer primary side
CSSampling is for this reason with R
CSOne end ground connection, drain electrode and the resistance R of the other end and power switch pipe Q
8Link to each other R
8The other end connects control chip U electric current induction pin 8;
(4) select the LED driving chip MT7930 of integrated power factor correcting to make control circuit, the annexation of each pin of control chip U is:
DRV external power grid drives pin 1, passes through R
9Be connected to the canopy utmost point of power switch pipe Q;
GND grounding leg 2 and TM test pin 3 ground connection;
The output pin 4 of COMP internal error amplifier passes through capacitor C
3Ground connection;
STP starts pin 5 and is connected to the output that resistance is controlled IC power supply unit (6) with VDD supply pin 7;
The auxiliary winding voltage feedback of DSEN pin 6, wherein resistance R
5One end is connected to primary feedback winding T
1-BAnode, the other end is connected to 6 pin of control chip U, resistance R
6With capacitor C
4An end in parallel is connected to 6 pin of control chip U, other end ground connection;
CS electric current induction pin 8 passes through resistance R
8The drain electrode and the sample resistance R that connect power switch pipe Q
CSOne end, resistance R
CSOther end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104388939A CN102917512A (en) | 2012-11-06 | 2012-11-06 | Method for improving power factor of LED (Light Emitting Diode) power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104388939A CN102917512A (en) | 2012-11-06 | 2012-11-06 | Method for improving power factor of LED (Light Emitting Diode) power supply circuit |
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|---|---|
| CN102917512A true CN102917512A (en) | 2013-02-06 |
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|---|---|---|---|
| CN2012104388939A Pending CN102917512A (en) | 2012-11-06 | 2012-11-06 | Method for improving power factor of LED (Light Emitting Diode) power supply circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414357A (en) * | 2013-04-13 | 2013-11-27 | 江阴荧特微电子有限公司 | Drive circuit, regulated by load voltage, of source end controlling constant current output power |
| CN110535352A (en) * | 2019-09-26 | 2019-12-03 | 四川虹锐电工有限责任公司 | DC-DC power supply circuit is isolated |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100265745A1 (en) * | 2009-04-16 | 2010-10-21 | Fsp Technology Inc. | Parameter configuration method for elements of power factor correction function converter |
| CN202005042U (en) * | 2011-04-07 | 2011-10-05 | 昂宝电子（上海）有限公司 | Novel light-emitting diode (LED) drive circuit with high power factor |
-
2012
- 2012-11-06 CN CN2012104388939A patent/CN102917512A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100265745A1 (en) * | 2009-04-16 | 2010-10-21 | Fsp Technology Inc. | Parameter configuration method for elements of power factor correction function converter |
| CN202005042U (en) * | 2011-04-07 | 2011-10-05 | 昂宝电子（上海）有限公司 | Novel light-emitting diode (LED) drive circuit with high power factor |
Non-Patent Citations (3)
| Title |
|---|
| MAXIC TECHNOLOGY CORPORATION: "《MT7930-12S24P-450mA-隔离日光灯方案》", 8 April 2012, article "《MT7930-12S24P-450mA-隔离日光灯方案》", pages: 3 * |
| MAXIC TECHNOLOGY CORPORATION: "《MT7930-5S1P/7S1P-330 mA -7W隔离球泡灯方案》", 11 November 2011, article "《MT7930-5S1P/7S1P-330 mA -7W隔离球泡灯方案》" * |
| 美芯晟科技有限公司: "《MT7930 单级、高级PFC，AC-DC LED驱动IC》", 11 February 2012, article "《MT7930 单级、高级PFC，AC-DC LED驱动IC》" * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414357A (en) * | 2013-04-13 | 2013-11-27 | 江阴荧特微电子有限公司 | Drive circuit, regulated by load voltage, of source end controlling constant current output power |
| CN103414357B (en) * | 2013-04-13 | 2018-10-09 | 江阴荧特微电子有限公司 | A kind of source adjusted by load voltage controls the driving circuit of constant current output power supply |
| CN110535352A (en) * | 2019-09-26 | 2019-12-03 | 四川虹锐电工有限责任公司 | DC-DC power supply circuit is isolated |
| CN110535352B (en) * | 2019-09-26 | 2022-02-08 | 四川虹锐电工有限责任公司 | Isolated DC-DC power supply circuit |
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Application publication date: 20130206 |