CN202121830U - Buck-boost constant-current power supply for LED lamps - Google Patents

Buck-boost constant-current power supply for LED lamps Download PDF

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Publication number
CN202121830U
CN202121830U CN2011201940459U CN201120194045U CN202121830U CN 202121830 U CN202121830 U CN 202121830U CN 2011201940459 U CN2011201940459 U CN 2011201940459U CN 201120194045 U CN201120194045 U CN 201120194045U CN 202121830 U CN202121830 U CN 202121830U
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CN
China
Prior art keywords
output
power supply
constant
comparison circuit
group
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN2011201940459U
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Chinese (zh)
Inventor
李锦红
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GUANGDONG KEGU POWER ELECTRONICS CO., LTD.
Original Assignee
FOSHAN KEGU POWER ELECTRONICS Co Ltd
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Priority to CN2011201940459U priority Critical patent/CN202121830U/en
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Publication of CN202121830U publication Critical patent/CN202121830U/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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

Abstract

A buck-boost constant-current power supply for LED lamps is characterized by comprising a rectifying circuit and a PFC (power factor correction) and DWM (distributed work manager) switch circuit. The PFC and DWM switch circuit comprises three groups of winding coils sharing the same core, a switching tube, a microcomputer chip, an optical coupler, a constant-voltage comparison circuit and a constant-current comparison circuit. The rectifying circuit is connected with the power supply by the aid of the first group of winding coils and the second group of winding coils, is connected with an output negative electrode of the power supply, the microcomputer chip is connected with the rectifying circuit, the third group of the winding coils is connected with the microcomputer chip, the switching tube is connected with the microcomputer chip, the constant-voltage comparison circuit is connected with a constant-voltage power supply and an output positive electrode of the power supply, the constant-current comparison circuit is connected with the constant-voltage power supply and a negative electrode of the power supply, the optical coupler is connected with a driving power supply, and the constant-current comparison circuit and the constant-voltage comparison circuit are in input connection with electric signals of the optical coupler. Compared with the prior art, the buck-boost constant-current power supply has the advantages of high converting efficiency, small size and capability of outputting higher voltage and current.

Description

A kind of LED lamp power of buck constant current output
Technical field
The utility model relates to a kind of light source and uses power supply.
Background technology
Existing LED fluorescent lamp needs output voltage than higher power supply, and all there is not high, the bulky shortcoming of conversion efficiency in the existing power supply that generally uses.
Summary of the invention
The goal of the invention of the utility model is to provide a kind of LED lamp power that can export than the buck constant current output higher electric current and voltage, that conversion efficiency is high, that volume is little.
The utility model is to realize like this; Comprise that rectification circuit, PFC add the DWM switching circuit; PFC adds the DWM switching circuit and comprises with three groups of winding coils, switching tube, microcomputer chip, optical coupler, constant voltage comparison circuit, constant current comparison circuit around core; The bridge rectifier output of rectification circuit links to each other with the power supply output cathode through first group of winding coil, second group of winding coil of serial connection; The bridge rectifier output of rectification circuit links to each other with the power supply output negative pole; Microcomputer chip startup power supply input pin links to each other with the bridge rectifier output of rectification circuit through resistance, and the output of the 3rd group of winding coil links to each other with the working power input pin of microcomputer chip through resistance, and the signal of telecommunication input of switching tube links to each other with the control signal output pin of microcomputer chip through resistance; Two conducting pin of switching tube link to each other with the output of second group of winding coil respectively and pass through grounding through resistance; The electrical signal of optical coupler links to each other with the signal of telecommunication input pin of microcomputer chip through resistance, and the constant voltage source input of constant voltage comparison circuit links to each other with constant voltage source, and the signal of telecommunication input of constant voltage comparison circuit links to each other with the power supply output cathode through resistance; The constant voltage source input of constant current comparison circuit links to each other with constant voltage source; The signal of telecommunication input of constant current comparison circuit links to each other with the power supply output negative pole through resistance, and the driving power input of optical coupler links to each other with driving power, and the signal of telecommunication output of constant current comparison circuit, the signal of telecommunication output of constant voltage comparison circuit link to each other with the signal of telecommunication input of optical coupler.During work; Switching tube moment conducting and closing; Make the output voltage of the output of second group of winding coil be higher than the voltage of the bridge rectifier output of rectification circuit, produce pressure reduction from making to power supply output cathode, power supply output negative pole, and luminous to LED lamp output driving power driving LED lamp; When pressure reduction between power supply output cathode, power supply output negative pole or electric current generation fluctuation; Through constant voltage comparison circuit or constant current comparison circuit output control signal,, adjust pressure reduction or electric current between power supply output cathode, power supply output negative pole in the stationary value that sets through the pipe moment conducting of microcomputer chip control switch and blanking time of closing.
Here, at the bridge rectifier output of the output of second group of winding coil and rectification circuit and connect electric capacity and carry out power factor correction.
Between first group of winding coil, second group of winding coil, connect the constant voltage power supply circuit of output constant voltage source, so that supply constant voltage source to constant voltage comparison circuit, constant current comparison circuit.
The utility model is owing to adopt the mode of operation of the back step-down of boosting earlier, and therefore, output voltage is than higher, and the conversion lower frequency is high, and circuit structure is simple, and volume is little, is fit to very much the high-tension LED fluorescent lamp of needs.
Compared with present technology the utility model has the advantage that can export than higher electric current and voltage, that conversion efficiency is high, that volume is little.
Description of drawings:
Fig. 1 is the circuit diagram of the utility model.
Embodiment:
Combine accompanying drawing and embodiment that the utility model is done describes in further detail at present:
As shown in the figure; The utility model comprises that rectification circuit 1, PFC add the DWM switching circuit; PFC adds the DWM switching circuit and comprises with three groups of winding coils 3,4,5, switching tube 6, microcomputer chip 7, optical coupler 8, constant voltage comparison circuit 9, constant current comparison circuit 10 around core; The bridge rectifier output of rectification circuit 1 links to each other with the power supply output cathode OUT+ that has filtering through first group of winding coil 3 of serial connection, second group of winding coil 4; The bridge rectifier output of rectification circuit 1 links to each other with the power supply output negative pole OUT-that has filtering; The resistor group that 7 liang of startup power supply input pins of microcomputer chip constitute through resistance R 8, R18, R3 by serial connection respectively, the resistor group that is made up of the resistance R 12, R1, the R29 that are connected in series link to each other with the bridge rectifier output of rectification circuit 1; The output of the 3rd group of winding coil 5 links to each other with the working power input pin of microcomputer chip 7 through resistance R 16; The diode D3, resistance R 17 of the output of the 3rd group of winding coil 5 through serial connection and microcomputer chip 7 wherein the driving power input of the coupling unit 8a of a starting power supply input pin and optical coupler 8 link to each other; The signal of telecommunication input of switching tube 6 links to each other with the control signal output pin of microcomputer chip 7 through resistance R 5; Two conducting pin of switching tube 6 link to each other with the output of second group of winding coil 4 respectively and pass through grounding through resistance; The coupling unit 8a electrical signal of optical coupler 8 links to each other with the signal of telecommunication input pin of microcomputer chip 7 through resistance R 21; The constant voltage source input of constant voltage comparison circuit 9 links to each other with constant voltage source; The signal of telecommunication input of constant voltage comparison circuit 9 links to each other with power supply output cathode OUT+ through resistance R 15, the R4 of serial connection, and the constant voltage source input of constant current comparison circuit 10 links to each other with constant voltage source, and resistance R 6, R10, R13 are attempted by on the power supply output negative pole OUT-; The signal of telecommunication input of constant current comparison circuit 10 is connected 13 of resistance R 10, resistance R through resistance R 27; The driving power input of the luminous component 8b of optical coupler 8 links to each other with driving power, and driving power derives from the out-put supply of 4 of first group of winding coils 3, second group of winding coil, and the signal of telecommunication output of constant voltage comparison circuit 9, constant current comparison circuit 10 links to each other with the signal of telecommunication input of the luminous component 8b of optical coupler 8 through diode D6, D5 respectively.
At first group of winding coil 3,4 constant voltage power supply circuits 11 that connect the output constant voltage source of second group of winding coil.
At the bridge rectifier output of the output of second group of winding coil 4 and rectification circuit 1 and connect capacitor C 15, c16 carries out power factor correction.
Between the bridge rectifier output of the output of second group of winding coil 4 and rectification circuit 1, be serially connected with resistance R 32, R33, power supply output cathode OUT+, power supply output negative pole OUT-are attempted by on the resistance R 32.

Claims (4)

1. the LED lamp power of buck constant current output; It is characterized in that comprising that rectification circuit, PFC add the DWM switching circuit; PFC adds the DWM switching circuit and comprises with three groups of winding coils, switching tube, microcomputer chip, optical coupler, constant voltage comparison circuit, constant current comparison circuit around core; The bridge rectifier output of rectification circuit links to each other with the power supply output cathode through first group of winding coil, second group of winding coil of serial connection; The bridge rectifier output of rectification circuit links to each other with the power supply output negative pole; Microcomputer chip startup power supply input pin links to each other with the bridge rectifier output of rectification circuit through resistance; The output of the 3rd group of winding coil links to each other with the working power input pin of microcomputer chip through resistance; The signal of telecommunication input of switching tube links to each other with the control signal output pin of microcomputer chip through resistance, and two conducting pin of switching tube link to each other with the output of second group of winding coil respectively and pass through grounding through resistance, and the electrical signal of optical coupler links to each other with the signal of telecommunication input pin of microcomputer chip through resistance; The constant voltage source input of constant voltage comparison circuit links to each other with constant voltage source; The signal of telecommunication input of constant voltage comparison circuit links to each other with the power supply output cathode through resistance, and the constant voltage source input of constant current comparison circuit links to each other with constant voltage source, and the signal of telecommunication input of constant current comparison circuit links to each other with the power supply output negative pole through resistance; The driving power input of optical coupler links to each other with driving power, and the signal of telecommunication output of constant current comparison circuit, the signal of telecommunication output of constant voltage comparison circuit link to each other with the signal of telecommunication input of optical coupler.
2. the LED lamp power of buck constant current output according to claim 1 is characterized in that between first group of winding coil, second group of winding coil, connecting the constant voltage power supply circuit of exporting constant voltage source.
3. the LED lamp power of buck constant current according to claim 1 and 2 output is characterized in that at the bridge rectifier output of the output of second group of winding coil and rectification circuit and connects electric capacity.
4. the LED lamp power of exportable high-tension current according to claim 3; It is characterized in that between the bridge rectifier output of the output of second group of winding coil and rectification circuit, being serially connected with two resistance, power supply output cathode, power supply output negative pole are attempted by resistance wherein on the resistance.
CN2011201940459U 2011-06-10 2011-06-10 Buck-boost constant-current power supply for LED lamps Expired - Lifetime CN202121830U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011201940459U CN202121830U (en) 2011-06-10 2011-06-10 Buck-boost constant-current power supply for LED lamps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011201940459U CN202121830U (en) 2011-06-10 2011-06-10 Buck-boost constant-current power supply for LED lamps

Publications (1)

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CN202121830U true CN202121830U (en) 2012-01-18

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CN2011201940459U Expired - Lifetime CN202121830U (en) 2011-06-10 2011-06-10 Buck-boost constant-current power supply for LED lamps

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103166449A (en) * 2012-10-31 2013-06-19 矽力杰半导体技术(杭州)有限公司 AC-DC power converter
CN104753325A (en) * 2013-12-31 2015-07-01 欧普照明股份有限公司 Boost-buck type direct current converting circuit
CN110149061A (en) * 2019-05-24 2019-08-20 安徽师范大学 The method for transformation of High Power Factor adjustable digital DC voltage source

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103166449A (en) * 2012-10-31 2013-06-19 矽力杰半导体技术(杭州)有限公司 AC-DC power converter
CN103166449B (en) * 2012-10-31 2015-10-07 矽力杰半导体技术(杭州)有限公司 A kind of AC-DC power converter
CN104753325A (en) * 2013-12-31 2015-07-01 欧普照明股份有限公司 Boost-buck type direct current converting circuit
CN104753325B (en) * 2013-12-31 2017-11-10 欧普照明股份有限公司 A kind of step-down/up type DC transfer circuit
CN110149061A (en) * 2019-05-24 2019-08-20 安徽师范大学 The method for transformation of High Power Factor adjustable digital DC voltage source

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
C56 Change in the name or address of the patentee

Owner name: GUANGDONG KEGU POWER CO., LTD.

Free format text: FORMER NAME: FOSHAN SOUTH SEA KEGU POWER ELECTRONICS CO LTD

CP03 Change of name, title or address

Address after: 528200, Guangdong City, Foshan Province Nanhai District lion town Shishan science and Technology Industrial Park A District Science and technology Avenue East 39 (workshop A) on the third floor

Patentee after: Guangdong Kegu Power Co., Ltd.

Address before: 528200 A, No. 39, science Avenue East, A Industrial Zone, Nanhai District, Guangdong, Foshan, Shishan

Patentee before: Foshan Kegu Power Electronics Co., Ltd.

C56 Change in the name or address of the patentee
CP03 Change of name, title or address

Address after: 528225 Guangdong, Nanhai District, Shishan science and Technology Industrial Park, the town of science and Technology Industrial Park A District, East Road, No. (plant A) on the third floor

Patentee after: GUANGDONG KEGU POWER ELECTRONICS CO., LTD.

Address before: 528200, Guangdong City, Foshan Province Nanhai District lion town Shishan science and Technology Industrial Park A District Science and technology Avenue East 39 (workshop A) on the third floor

Patentee before: Guangdong Kegu Power Co., Ltd.

CX01 Expiry of patent term

Granted publication date: 20120118

CX01 Expiry of patent term