CN101600277B - LED circuit - Google Patents
LED circuit Download PDFInfo
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- CN101600277B CN101600277B CN2009101086742A CN200910108674A CN101600277B CN 101600277 B CN101600277 B CN 101600277B CN 2009101086742 A CN2009101086742 A CN 2009101086742A CN 200910108674 A CN200910108674 A CN 200910108674A CN 101600277 B CN101600277 B CN 101600277B
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- led
- led circuit
- power factor
- switch
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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
The invention relates to an LED circuit, which comprises a power factor control and voltage boosting unit, an LED lamp, and a voltage reduction unit which are connected in turn, a control unit which is connected with the power factor control and voltage boosting unit, the LED lamp, and the voltage reduction unit, and a detection unit, wherein the power factor control and voltage boosting unit and the voltage reduction unit independently work. On the basis of constant current output, the LED circuit can also adjust the phase difference between input voltage and loop current so as to greatly correct power factors and obtain high work efficiency; and compared with the prior art, the LED circuit has flicker-free adjust luminance, good stability and high reliability.
Description
Technical field
The present invention relates to Digital Signal Processing, be specifically related to a kind of led circuit.
Background technology
At the LED applied technical field, particularly LED lighting technical field of current develop rapidly, no matter be great power LED or middle low power LED, consider operating efficiency, its drive circuit generally all adopts the constant current switch power supply, and abandons linear power supply.According to its working method, probably can be divided into following several types: voltage-dropping type drive circuit BUCK; Booster type drive circuit BOOST; Buck-boost type drive circuit BOOST-BUCK, as: concrete structure is as shown in Figure 1; Falling-rising voltage-dropping type drive circuit BBB; Falling-rising die mould drive circuit BUCK-BOOST: though these several kinds of modes also are that pluses and minuses are respectively arranged; But they have a common characteristic: whole driven application circuit only contains a FET MOSFET; This just limits this application scheme can only use its boost BOOST and step-down BUCK function simultaneously, and can not independently separate application; Therefore they can only accomplish to export when constant at electric current, increase its operating efficiency as far as possible.
Summary of the invention
The technical issues that need to address of the present invention are, how a kind of led circuit is provided, and can have perfect power factor, and flicker free is regulated brightness, and good stability, reliability are high, are particluarly suitable for the high-power LED illumination technical field.
Technical problem of the present invention solves like this, makes up a kind of led circuit, comprises LED lamp and pressure unit, also comprises:
Power factor controlling and boosting unit constitute the loop with LED lamp, pressure unit and input power supply successively, separate working alone, being used to boost and adjust the phase difference between input voltage and loop current with said pressure unit;
Detecting unit is connected with said input power supply, is used to detect input voltage and loop current;
Control unit is connected with said detecting unit, said power factor controlling of control connection and boosting unit, LED lamp and pressure unit.
According to led circuit provided by the invention, said detecting unit and control unit include, but are not limited to adopt the mode that is built in the integrated chip.
According to led circuit provided by the invention; Said power factor controlling and boosting unit comprise electric capacity and the switch between said diode anode and the ground between inductance, diode and said diode cathode and the ground that is serially connected on the said loop, and said switch control end is connected with said control unit; Pressure unit comprises another switch in the said led circuit, and this another switch control end also is connected with said control unit.
According to led circuit provided by the invention, said switch is a FET.
According to led circuit provided by the invention, the bridge rectifier unit that said input power supply is an external AC.
Led circuit provided by the invention; Adopt two FETs, the phase difference between input voltage and loop current can also be adjusted like this in independent boost BOOST and the step-down BUCK unit of separately using on electric current output basis of constant; Thereby corrected output factor significantly; Obtain high operating efficiency, regulate brightness than the prior art flicker free simultaneously, good stability, reliability height.
Description of drawings
Further the present invention is elaborated below in conjunction with accompanying drawing and specific embodiment.
Fig. 1 is traditional buck-boost type led drive circuit structural representation;
Fig. 2 is a led drive circuit theory diagram of the present invention;
Fig. 3 is the circuit theory sketch map of the specific embodiment of the invention.
Embodiment
As shown in Figure 2, led circuit of the present invention comprises:
The input power supply is for each circuit unit provides working power;
Power factor controlling and boosting unit are used to boost and adjust the phase difference between input voltage and loop current;
The LED lamp provides LED illumination;
Pressure unit is used for step-down, is used for stabling current output with said boosting;
Above-mentioned input power supply, power factor controlling and boosting unit, LED lamp and pressure unit constitute the loop, also comprise:
Detecting unit is connected with said input power supply, is used to detect input voltage and loop current;
Control unit is connected with said detecting unit, said power factor controlling of control connection and boosting unit, LED lamp and pressure unit.
Circuit of the present invention is on traditional buck-boost type led drive circuit basis; Increase a control switch; Make boost BOOST and step-down BUCK unit independently separate use, make boosting unit upgrade to power factor controlling and boosting unit, on electric current output basis of constant, can also adjust the phase difference between input voltage and loop current like this; Thereby can the corrected output factor, obtain high operating efficiency.
As shown in Figure 3, in the specific embodiment of the invention detecting unit and control unit are integrated in the integrated chip 1 of customization, the operation principle of this circuit is:
Input voltage is direct current or exchanges; Through behind the bridge rectifier; Cooperate the waveform that detects input voltage by integrated chip 1 pin BLDR; Learn whether need regulate brightness after, integrated chip 1 draws the current attenuation signal and from the switch of pin CG1 output control FET Q3, and can final control step-down module BUCK; Cooperate by integrated chip 1 pin VSNS and pin ISNS simultaneously and detect input voltage and loop current waveform; Draw voltage; Phase difference between the electric current, by integrated chip 1 handle automatically and from pin pfc G provide compensating signal give next stage==" power factor controlling and boosting unit 2.
Direct voltage after the rectification inputs to power factor controlling and this one-level of boosting unit PFC Boost, controls the switch of FET Q2 by compensating signal, obtains perfect current-voltage waveform, and power factor is almost 1.Export to next stage==" step-down module BUCK.
The current attenuation signal produces the switch angle that signal is used for controlling step-down module BUCK FET Q3 after this integrated chip 1 is handled, use thereby guarantee to export the electric current supply LED illumination that is fit to.
The above is merely preferred embodiment of the present invention, and all equalizations of being done according to claim scope of the present invention change and modify, and all should belong to the covering scope of claim of the present invention.
Claims (6)
1. a led circuit comprises LED lamp and pressure unit, it is characterized in that, also comprises:
Power factor controlling and boosting unit constitute the loop with LED lamp, pressure unit and input power supply successively, separate working alone, being used to boost and adjust the phase difference between input voltage and loop current with said pressure unit;
Detecting unit is connected with said input power supply, is used to detect input voltage and loop current;
With the control unit that said detecting unit is connected, said power factor controlling of control connection and boosting unit, LED lamp and pressure unit.
2. according to the said led circuit of claim 1, it is characterized in that said detecting unit and control unit are built in the integrated chip.
3. according to the said led circuit of claim 1; It is characterized in that; Said power factor controlling and boosting unit comprise electric capacity and the switch between said diode anode and the ground between inductance, diode and said diode cathode and the ground that is serially connected on the said loop, and said switch control end is connected with said control unit.
4. according to the said led circuit of claim 3, it is characterized in that pressure unit comprises another switch in the said led circuit, this another switch control end is connected with said control unit.
5. according to claim 3 or 4 said led circuits, it is characterized in that said switch is a FET.
6. according to the said led circuit of claim 1, it is characterized in that the bridge rectifier unit that said input power supply is an external AC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101086742A CN101600277B (en) | 2009-07-13 | 2009-07-13 | LED circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101086742A CN101600277B (en) | 2009-07-13 | 2009-07-13 | LED circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101600277A CN101600277A (en) | 2009-12-09 |
| CN101600277B true CN101600277B (en) | 2012-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101086742A Expired - Fee Related CN101600277B (en) | 2009-07-13 | 2009-07-13 | LED circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN101600277B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101778507B (en) * | 2009-12-10 | 2013-06-12 | 海洋王照明科技股份有限公司 | LED control circuit |
| CN101861022A (en) * | 2010-05-27 | 2010-10-13 | 上海北京大学微电子研究院 | LED driving power and starting method of power tube thereof |
| CN102076151A (en) * | 2011-01-10 | 2011-05-25 | 杭州矽力杰半导体技术有限公司 | High-efficiency light emitting diode (LED) drive circuit and drive method |
| CN102196635A (en) * | 2011-03-11 | 2011-09-21 | 苏州卓能微电子技术有限公司 | Opening method of output tube of LED drive integrated circuit |
| CN104578799B (en) * | 2014-12-25 | 2017-04-12 | 成都芯源系统有限公司 | Switching power supply system and control circuit and control method thereof |
| WO2022011645A1 (en) * | 2020-07-16 | 2022-01-20 | 深圳市骁阳工程咨询有限公司 | Power supply device and sunlight simulation device |
| CN112135394A (en) * | 2020-10-22 | 2020-12-25 | 深圳尚莱特照明技术有限公司 | A constant current LED drive circuit that can be boosted and stepped down |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2715465Y (en) * | 2004-09-20 | 2005-08-03 | 林兴照 | High light emergency light |
| CN201043690Y (en) * | 2007-01-12 | 2008-04-02 | 邹日南 | Can keep bright miner's lamp |
-
2009
- 2009-07-13 CN CN2009101086742A patent/CN101600277B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2715465Y (en) * | 2004-09-20 | 2005-08-03 | 林兴照 | High light emergency light |
| CN201043690Y (en) * | 2007-01-12 | 2008-04-02 | 邹日南 | Can keep bright miner's lamp |
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| Publication number | Publication date |
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| CN101600277A (en) | 2009-12-09 |
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Address after: 518000 Tian'an International Building, Renmin South Road, Nanhu Street, Luohu District, Shenzhen City, Guangdong Province, B2101 Co-patentee after: Chen Yulin Patentee after: Liu Zhentao Address before: Room 1901, Block B, Tian'an International Building, Renmin South Road, Luohu District, Shenzhen City, Guangdong Province Co-patentee before: Chen Yulin Patentee before: Liu Zhentao |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121031 |
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| CF01 | Termination of patent right due to non-payment of annual fee |