CN204518132U - Novel no electrolytic capacitor illumination LED drive circuit - Google Patents
Novel no electrolytic capacitor illumination LED drive circuit Download PDFInfo
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- CN204518132U CN204518132U CN201520066297.1U CN201520066297U CN204518132U CN 204518132 U CN204518132 U CN 204518132U CN 201520066297 U CN201520066297 U CN 201520066297U CN 204518132 U CN204518132 U CN 204518132U
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
A kind of novel no electrolytic capacitor illumination LED drive circuit.Circuit comprises inverse excitation type converter and power conditioning circuitry two parts, and inverse excitation type converter is by input rectifying bridge, transformer winding N
p, secondary winding Ns, switching tube Q1, diode Dr and output filter capacitor C
ocomposition, power conditioning circuitry is by diode D5, Da, and switching tube Q2, Q3, Energy Coupling electric capacity Ca forms.The duty ratio of Q1 in a power frequency period keeps constant substantially, allows inverse excitation type converter work in discontinuous conduct mode, thus makes converter obtain higher input power factor, achieves the power factor emendation function not with pfc circuit; For as input power Pin<Po, the energy that input is not enough will be provided by Ca, and control Q2 provides constant operation electric current for LED; As Pin > Po, inputting too much energy will absorb storage by Ca, and control Q3 provides constant operation electric current for LED.
Description
Technical field
The utility model relates to one and has high useful life, the novel illumination LED drive circuit not containing electrochemical capacitor.
Background technology
Green energy conservation illumination has become the major issue paid close attention to countries in the world.High brightness LED be after incandescent lamp, fluorescent lamp, high-voltage gas discharging light the 4th generation lighting source, its have efficient, energy-conservation, pollution-free, can the advantage such as simulating nature light, be rapidly developed in recent years, become the leading products of illumination market gradually.
The long-life of LED itself, (8 ~ 100,000 h) proposed very high request to the life-span of its respective drive power supply.In current LED driving power, the general electrochemical capacitor that adopts is for making energy-storage travelling wave tube.High temperature has a great impact the useful life to electrochemical capacitor, and in field of LED illumination, actual temperature generally can reach more than 60 degrees Celsius, and now, electrochemical capacitor life only has 10,000 hours, with LED its shelf-life gap great disparity.Therefore, when electrochemical capacitor is in the applications that ambient temperature is higher, it will have a strong impact on the life-span of whole system, at present, how reduce even to remove electrochemical capacitor, become one of focus of LED driving power research.
Summary of the invention
For above problem, the purpose of this utility model is to provide one and has high useful life, the illumination LED drive circuit not containing electrochemical capacitor.
The utility model solves the technical scheme that its technical problem adopts: LED drive circuit is by input rectifying bridge, transformer winding N
p, secondary winding Ns, switching tube Q1, transformer secondary rectifier diode Dr and output filter capacitor C
oform an inverse excitation type converter.The input of inverse excitation type converter with the addition of Energy Coupling electric capacity Ca and energy compensating control switch pipe Q2, is provided with non-return diode Da between transformer primary side and electric capacity Ca; Converter output terminal is provided with energy adjustment switching tube Q3; The duty ratio of Q1 in a power frequency period keeps constant substantially, allows inverse excitation type converter work in discontinuous conduct mode, thus makes converter obtain higher input power factor, achieves the power factor emendation function not with pfc circuit.
Diode D5, Da, switching tube Q2, Q3 and Energy Coupling electric capacity Ca form the power conditioning circuitry of LED drive circuit, realize the constant current-supplying of LED load.For as input power Pin< Po, Q1 conducting off state is constant, Q3 constant conduction, the energy that input is not enough will be provided by Ca, control Q2 provides constant operation electric current for LED, and Q2 changes on off state according to output situation, and now on Ca, voltage VCa declines, when Q2 adjustment can not meet constant current requirement, the duty ratio of adjustable Q1 is supplemented.
And as Pin > Po, Q1 on off state is constant, Q2 continues to turn off, and inputting too much energy will absorb by Ca storages, and control Q3 duty ratio provides constant operation electric current for LED, and Q3 is according to the situation of output change on off state.Now, when Q3 turns off, unnecessary energy will be stored in Ca, and VCa rises.When Q3 adjustment can not meet constant current requirement, also the duty ratio of adjustable Q1 is supplemented.
The beneficial effects of the utility model are, circuit has higher power factor, does not have electrochemical capacitor, have and extend useful life.
Accompanying drawing explanation
Be described in further detail according to embodiment and accompanying drawing 1 couple of the present invention below.
Figure of description 1 is novel no electrolytic capacitor illumination LED drive circuit schematic diagram, in figure, Vin is AC power, D1, D2, D3, D4 are 4 diodes of composition rectifier bridge, D5, Da, are unidirectional non-return diode, and Dr is transformer secondary rectifier diode, Q1, Q2, Q3 are switching tube MOSFET, Ca is Energy Coupling electric capacity, and Co is output filter capacitor, NP and Ns is respectively transformer primary secondary, LED is load, and Vca is the magnitude of voltage at Energy Coupling electric capacity two ends.
Embodiment
Following present the specific embodiment of a kind of novel no electrolytic capacitor illumination LED drive circuit that the utility model provides.
As shown in Figure 1, as input power Pin< Po, Q1 duty ratio is constant, Q3 constant conduction, and Q2 provides constant operation electric current for controlling Energy Coupling electric capacity Ca for LED.During system works, first conducting Q1, Q3, through after a period of time, then open Q2, the energy that electric capacity Ca stores exports through Q2, for LED provides constant operation electric current.Q2 has constant operating current according to output situation adjustment duty ratio to meet LED.During Q2 conducting, the upper voltage VCa of Ca declines, and when Q2 adjustment can not meet the demands, the duty ratio of adjustable Q1 is supplemented.
As Pin > Po, Q1 duty ratio is constant, and Q2 continues to turn off, for LED provides constant operation electric current to complete control by Q3.During system works, switching tube Q1 conducting, Q2, Q3 end, and LED load provides energy by Co, Transformer Winding energy storage, after Q1 cut-off, Q2, continuation remain off, after Q3 time delay a period of time, conducting exports energy, in delay time, Energy Coupling capacitor charging storage power, delay time length decides according to the size of circuit output current.In this section of delay time of Q3 Delayed conducting, input too much energy and to be absorbed by Ca by Da and store, to discharge when the Pin< Po, change Q3 duty ratio according to output situation, ensure output services current constant.When Q3 turns off, unnecessary stored energy is in Ca, and Ca both end voltage VCa rises, and when Q3 adjustment can not meet the demands, also the duty ratio of adjustable Q1 is supplemented.
Claims (1)
1. a novel no electrolytic capacitor illumination LED drive circuit, it is characterized in that: in drive circuit, the input of inverse excitation type converter with the addition of Energy Coupling electric capacity Ca, energy compensating control switch pipe Q2, is provided with non-return diode Da between transformer primary side and electric capacity Ca; Converter output terminal is provided with energy adjustment switching tube Q3; Inverse excitation type converter works in discontinuous conduct mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520066297.1U CN204518132U (en) | 2015-01-30 | 2015-01-30 | Novel no electrolytic capacitor illumination LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520066297.1U CN204518132U (en) | 2015-01-30 | 2015-01-30 | Novel no electrolytic capacitor illumination LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204518132U true CN204518132U (en) | 2015-07-29 |
Family
ID=53716057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520066297.1U Expired - Fee Related CN204518132U (en) | 2015-01-30 | 2015-01-30 | Novel no electrolytic capacitor illumination LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204518132U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106535387A (en) * | 2016-09-06 | 2017-03-22 | 上海大学 | High-power factor isolated type electrolytic capacitor-free LED driving power source |
| CN108337778A (en) * | 2018-03-14 | 2018-07-27 | 福州大学 | A kind of electroless LED drive power of two-stage type and control method |
| CN113099576A (en) * | 2021-04-21 | 2021-07-09 | 福州大学 | Single-stage two-switch electrolytic-capacitor-free LED driving power supply and control method |
-
2015
- 2015-01-30 CN CN201520066297.1U patent/CN204518132U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106535387A (en) * | 2016-09-06 | 2017-03-22 | 上海大学 | High-power factor isolated type electrolytic capacitor-free LED driving power source |
| CN106535387B (en) * | 2016-09-06 | 2018-04-27 | 上海大学 | A kind of High Power Factor isolated form no electrolytic capacitor LED drive power |
| CN108337778A (en) * | 2018-03-14 | 2018-07-27 | 福州大学 | A kind of electroless LED drive power of two-stage type and control method |
| CN113099576A (en) * | 2021-04-21 | 2021-07-09 | 福州大学 | Single-stage two-switch electrolytic-capacitor-free LED driving power supply and control method |
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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: 20150729 Termination date: 20160130 |
|
| EXPY | Termination of patent right or utility model |