CN202873127U - Two-stage LED drive circuit - Google Patents
Two-stage LED drive circuit Download PDFInfo
- Publication number
- CN202873127U CN202873127U CN 201220454210 CN201220454210U CN202873127U CN 202873127 U CN202873127 U CN 202873127U CN 201220454210 CN201220454210 CN 201220454210 CN 201220454210 U CN201220454210 U CN 201220454210U CN 202873127 U CN202873127 U CN 202873127U
- Authority
- CN
- China
- Prior art keywords
- led
- circuit
- control circuit
- drive circuit
- twin
- 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 - Fee Related
Links
Images
Abstract
The utility model relates to the technical field of LED illumination, and especially relates to a two-stage LED drive circuit, comprising a rectification circuit rectifies AC signals to DC signals, a first control circuit which transforms the rectified DC signals to stable low-voltage DC signals, an LED module, and a second control circuit which controls and drives the LED module. The rectification circuit, the first control circuit, the second control circuit, and the LED module are connected in sequence. The two-stage LED drive circuit improves a problem of overhigh LED tandem drive voltage, and can be directly connected with the mains supply to drive LEDs.
Description
Technical field
The utility model relates to the LED lighting technical field, relates in particular to a kind of twin-stage led drive circuit.
Background technology
The ligthing paraphernalias such as liquid crystal display back of the body illuminator, street lamp need the LED of a plurality of high brightness, and these LED generally connect or are parallel in the drive circuit.Series and parallel connections has pluses and minuses separately, and the advantage of series connection is that brightness is even, and the place driving circuit structure is simple; And advantage in parallel is to use a plurality of LED of low voltage drive, even a LED breaks down, other LED still can work on; But shortcoming separately is fairly obvious, and tandem drive needs high voltage, and in addition, the LED of series connection has one to open circuit, and other LED also can't work; The electric current of each LED in parallel is difficult to be consistent, and there is deviation in brightness.It is the drive circuit (as shown in Figure 2) that adopts single-stage that the LED of general series connection drives, and led drive circuit in parallel is the DC power supply that is input as low-voltage, can not connect civil power.
The utility model content
The purpose of this utility model is for the technical problem that will solve, and a kind of twin-stage led drive circuit is provided, and this twin-stage led drive circuit has improved the problem of LED tandem drive overtension, and can directly access the civil power driving LED.
A kind of twin-stage led drive circuit, comprise with the AC signal rectification being the rectification circuit of direct current signal, direct current signal is converted to the first control circuit of stable low-voltage dc signal, the LED module, and the second control circuit of control and driving LED module, described rectification circuit, first control circuit, second control circuit are connected with the LED module and are connected.
Wherein, be provided with the first filter circuit between described rectification circuit and the first control circuit, be provided with the second filter circuit between described first control circuit and the second control circuit.
Wherein, described LED module comprises the LED string by a plurality of LED series connection.
Further, described LED module comprises the LED string of a plurality of parallel connections.
Wherein, described twin-stage led drive circuit also comprises a plurality of sampling resistors, and each described LED string place branch road is equipped with a sampling resistor, and described sampling resistor is contacted with second control circuit and corresponding LED respectively and connect.
The beneficial effects of the utility model are:
1, twin-stage led drive circuit of the present utility model adopts twin-stage to drive, and has improved the problem of LED tandem drive overtension, and can directly access the civil power driving LED;
2, this circuit is provided with sampling resistor, has guaranteed the constant of electric current, so that the electric current of each LED string in parallel is consistent, brightness is even.
Description of drawings
Fig. 1 is the modular structure figure of twin-stage led drive circuit of the present utility model.
Fig. 2 is the modular structure figure of the series LED drive circuit of prior art.
Embodiment
For the purpose, technical scheme and the advantage that make utility model is clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.
As shown in Figure 1, a kind of twin-stage led drive circuit, comprise with the AC signal rectification being the rectification circuit of direct current signal, the direct current signal of rectification is converted to the first control circuit of stable low-voltage dc signal, the LED module, and the second control circuit of control and driving LED module, described rectification circuit, first control circuit, second control circuit are connected with the LED module and are connected.Twin-stage led drive circuit of the present utility model adopts twin-stage to drive, and has improved the problem of LED tandem drive overtension, and can directly access the civil power driving LED.The advantage of LED series and parallel connections that this drive circuit is integrated has overcome the shortcoming of LED series and parallel connections, and it is better to drive effect.
First control circuit comprises high frequency transformer, controller, clamp circuit, power MOS pipe and the feedback circuit that connects successively, and the output of described feedback circuit is electrically connected with controller.First control circuit is converted to the required low-voltage dc signal VCC of drive circuit with commercial power rectification filtered d. c. voltage signal (high pressure), feedback circuit is to the VCC sampling feedback, controller is according to the pulse duration of feedback signal regulation output, so that secondary output voltage is stable.First control circuit can adopt anti-swash, the topology such as normal shock realizes.
Wherein, be provided with the first filter circuit between described rectification circuit and the first control circuit, be provided with the second filter circuit between described first control circuit and the second control circuit.The first filter circuit and the second filter circuit can filter out clutter, make the output voltage of circuit more stable.
Wherein, described LED module comprises the LED string by a plurality of LED series connection.
Further, described LED module comprises the LED string of a plurality of parallel connections.
Wherein, described twin-stage led drive circuit also comprises a plurality of sampling resistors, and each described LED string place branch road is equipped with a sampling resistor, and described sampling resistor is contacted with second control circuit and corresponding LED respectively and connect.This circuit is provided with sampling resistor, has guaranteed the constant of electric current, so that the electric current of each LED string in parallel is consistent, brightness is even.Second control circuit comes the pwm signal of regulation output by the sampled voltage of sampling resistor, and then controls electric current constant of each paths of LEDs string.
Above content only is preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (5)
1. twin-stage led drive circuit, it is characterized in that: comprise with the AC signal rectification being the rectification circuit of direct current signal, direct current signal is converted to the first control circuit of stable low-voltage dc signal, the LED module, and the second control circuit of control and driving LED module, described rectification circuit, first control circuit, second control circuit are connected with the LED module and are connected.
2. a kind of twin-stage led drive circuit according to claim 1 is characterized in that: be provided with the first filter circuit between described rectification circuit and the first control circuit, be provided with the second filter circuit between described first control circuit and the second control circuit.
3. a kind of twin-stage led drive circuit according to claim 1 is characterized in that: described LED module comprises the LED string by a plurality of LED series connection.
4. a kind of twin-stage led drive circuit according to claim 3 is characterized in that: described LED module comprises the LED string of a plurality of parallel connections.
5. a kind of twin-stage led drive circuit according to claim 4, it is characterized in that: described twin-stage led drive circuit also comprises a plurality of sampling resistors, each described LED string place branch road is equipped with a sampling resistor, and described sampling resistor is contacted with second control circuit and corresponding LED respectively and connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220454210 CN202873127U (en) | 2012-09-07 | 2012-09-07 | Two-stage LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220454210 CN202873127U (en) | 2012-09-07 | 2012-09-07 | Two-stage LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202873127U true CN202873127U (en) | 2013-04-10 |
Family
ID=48039805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220454210 Expired - Fee Related CN202873127U (en) | 2012-09-07 | 2012-09-07 | Two-stage LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202873127U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103209506A (en) * | 2013-04-25 | 2013-07-17 | 赵天鹏 | Low-voltage bypass electricity taking method for alternating current direct driving light-emitting diode (LED) and integrated circuit |
-
2012
- 2012-09-07 CN CN 201220454210 patent/CN202873127U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103209506A (en) * | 2013-04-25 | 2013-07-17 | 赵天鹏 | Low-voltage bypass electricity taking method for alternating current direct driving light-emitting diode (LED) and integrated circuit |
| CN103209506B (en) * | 2013-04-25 | 2015-02-18 | 合肥云杉光电科技有限公司 | Low-voltage bypass electricity taking method for alternating current direct driving light-emitting diode (LED) and integrated circuit |
| US9301355B2 (en) | 2013-04-25 | 2016-03-29 | Hefei Spruce Optoelectronic Technology Co., Ltd. | Method of taking power with low-voltage bypass by integrated circuit for AC direct driving LEDs and the integrated circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102065600B (en) | LED dimming drive system | |
| CN203387732U (en) | Ceiling lamp adopting non-isolated driving circuit | |
| CN202353859U (en) | Controllable silicon light regulation device and illuminating system | |
| CN102300355B (en) | Light emitting diode (LED) dimming system | |
| CN103280190B (en) | A kind of backlight drive circuit, liquid crystal indicator and backlight driving method | |
| WO2017124748A1 (en) | Switch power supply having active power factor correction | |
| CN202050563U (en) | Flyback dimming LED (light-emitting diode) drive circuit | |
| CN103139992A (en) | Light-emitting diode (LED) dimming driving system with silicon controlled bypass dimming circuit | |
| CN103313473A (en) | Power line carrier communication-based light-emitting diode (LED) dimming circuit | |
| CN104411042A (en) | LED (light emitting diode) drive device | |
| CN103871371A (en) | LED (light-emitting diode) backlight driving circuit, backlight module and liquid crystal display device | |
| CN103889116A (en) | LED driving circuit composed of discrete devices | |
| CN203523088U (en) | LED indoor lighting system | |
| CN201439885U (en) | High-power LED illuminating system | |
| CN102469668B (en) | LED power supply circuit capable of being matched with electronic transformer | |
| CN203352870U (en) | LED dimming circuit based on power line carrier communication | |
| CN202565513U (en) | Built-in drive power of light-emitting diode (LED) fluorescent lamp | |
| CN202873127U (en) | Two-stage LED drive circuit | |
| CN201910958U (en) | Multi-channel constant-current light emitting diode (LED) lamp drive circuit | |
| CN102791063A (en) | Intelligent LED module with function of automatic voltage regulation | |
| CN203120255U (en) | LED control system circuit for primary-side sampling | |
| CN201937901U (en) | Intelligent constant-voltage type light emitting diode (LED) dimming controller | |
| CN203691696U (en) | Bridgeless LED drive circuit | |
| CN103228083A (en) | Intelligent dimming LED driving power supply | |
| CN207053836U (en) | A kind of LED high-voltage driving circuit with dimming function |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20170907 |