CN103428946A - LED constant current power source circuit - Google Patents
LED constant current power source circuit Download PDFInfo
- Publication number
- CN103428946A CN103428946A CN2012101618375A CN201210161837A CN103428946A CN 103428946 A CN103428946 A CN 103428946A CN 2012101618375 A CN2012101618375 A CN 2012101618375A CN 201210161837 A CN201210161837 A CN 201210161837A CN 103428946 A CN103428946 A CN 103428946A
- Authority
- CN
- China
- Prior art keywords
- circuit module
- circuit
- module
- current
- pwm control
- 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.)
- Pending
Links
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
An LED constant current power source circuit comprises an input protection circuit module, an EMI filtering circuit module, a rectification filtering circuit module, a power conversion circuit module, a direct current output circuit, a voltage stabilization constant current circuit module, a feedback circuit module, a PWM control circuit module, a PFC circuit module and a sampling circuit module, wherein the current sampling circuit module, the feedback circuit module and the PWM control circuit module are combined together, and the functions of overvoltage/ overcurrent protection and output short-circuit protection are achieved. When the voltage or the currents of an output end is detected to be abnormal, the signal is fed back to the PWM control circuit module through the feedback circuit module, and an IC in the PWM control circuit module outputs a corresponding signal to enable the power source circuit to stop output work, so that an LED lamp connected with the power source circuit for use is protected. Meanwhile, the LED constant current power source circuit has the advantages of being high in constant current accuracy, high in reliability, simple in circuit structure, low in cost and the like.
Description
Technical field
The present invention relates to a kind of power circuit, be specifically related to a kind of LED constant-current power supply circuit.
Background technology
LED (Light Emitting Diode, light-emitting diode) there is the advantages such as environmental protection, energy-conservation, life-span length, high brightness, LED, as a kind of novel green light source product, must be the trend of future development, and 21st century will enter take the novel illumination light source epoch that LED is representative.At present, LED generally adopts DC constant current power supply to drive, and that more existing LED constant-current supplies exist constant current accuracy is not high, the shortcoming such as circuit is more complicated.
Summary of the invention
For overcoming the problem of the deficiencies in the prior art and existence, the invention provides that a kind of to have a constant current accuracy high, the LED constant-current power supply circuit that circuit structure is simple and cost is low.
The present invention is achieved by the following technical solutions: a kind of LED constant-current power supply circuit, comprise input protection circuit module, EMI filter circuit module, current rectifying and wave filtering circuit module, power conversion circuit module, DC output circuit, pressure-stabilizing constant flow circuit module, feedback circuit module, pwm control circuit module and pfc circuit module, ac voltage signal input in power circuit, input protection circuit module, EMI filter circuit module, current rectifying and wave filtering circuit module, the power conversion circuit module connects successively; In the d. c. voltage signal output of power circuit, power conversion circuit module, current rectifying and wave filtering circuit module, DC output circuit, pressure-stabilizing constant flow circuit module, feedback circuit module connect successively; Described pwm control circuit module is connected with power conversion circuit module, feedback circuit module and pfc circuit module; Described pfc circuit module also is connected with the current rectifying and wave filtering circuit module of ac voltage signal input.
Further, described LED constant-current power supply circuit also comprises the sample circuit module, and this sample circuit module is connected between DC output circuit and feedback circuit module; Described sample circuit module comprises voltage sampling module and current sample module.
Described current sampling circuit module and feedback circuit module and pwm control circuit module combine; function with overvoltage/overcurrent protection and output short circuit protection; when the voltage that output detected or current anomaly; by the feedback circuit module, signal feedback is arrived to the pwm control circuit module; IC in the pwm control circuit module just can output correlation signal; make power circuit stop output services, be attached thereto the LED light fixture of use with protection.
It is high that the present invention has a constant current accuracy, and reliability is high and circuit structure simple, low cost and other advantages.
The accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present invention.
Embodiment
Understanding for the ease of those skilled in the art, be described in further detail the present invention below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, a kind of LED constant-current power supply circuit, comprise input protection circuit module, EMI filter circuit module, current rectifying and wave filtering circuit module, power conversion circuit module, DC output circuit, pressure-stabilizing constant flow circuit module, feedback circuit module, pwm control circuit module and pfc circuit module, ac voltage signal input in power circuit, input protection circuit module, EMI filter circuit module, current rectifying and wave filtering circuit module, the power conversion circuit module connects successively; In the d. c. voltage signal output of power circuit, power conversion circuit module, current rectifying and wave filtering circuit module, DC output circuit, pressure-stabilizing constant flow circuit module, feedback circuit module connect successively; Described pwm control circuit module is connected with power conversion circuit module, feedback circuit module and pfc circuit module; Described pfc circuit module also is connected with the current rectifying and wave filtering circuit module of ac voltage signal input.The abbreviation that PWM is Pulse Width Modulation, mean " pulse width modulation "; The abbreviation that PFC is Power Factor Correction, mean " power factor correction "; The abbreviation that EMI is Electro-Magnetic Interference, mean the meaning of " electromagnetic interference ".
Further, described LED constant-current power supply circuit also comprises the sample circuit module, and this sample circuit module is connected between DC output circuit and feedback circuit module; Described sample circuit module comprises voltage sampling module and current sample module.
Described current sampling circuit module and feedback circuit module and pwm control circuit module combine; function with overvoltage/overcurrent protection and output short circuit protection; when the voltage that output detected or current anomaly; by the feedback circuit module, signal feedback is arrived to the pwm control circuit module; IC in the pwm control circuit module just can output correlation signal; make power circuit stop output services, be attached thereto the LED light fixture of use with protection.
Above-described embodiment is preferably implementation of the present invention, is not limitation of the invention, and under the prerequisite that does not break away from inventive concept of the present invention, any apparent replacement is all within protection scope of the present invention.
Claims (3)
1. a LED constant-current power supply circuit, it is characterized in that: comprise input protection circuit module, EMI filter circuit module, current rectifying and wave filtering circuit module, power conversion circuit module, DC output circuit, pressure-stabilizing constant flow circuit module, feedback circuit module, pwm control circuit module and pfc circuit module, ac voltage signal input in power circuit, input protection circuit module, EMI filter circuit module, current rectifying and wave filtering circuit module, the power conversion circuit module connects successively; In the d. c. voltage signal output of power circuit, power conversion circuit module, current rectifying and wave filtering circuit module, DC output circuit, pressure-stabilizing constant flow circuit module, feedback circuit module connect successively; Described pwm control circuit module is connected with power conversion circuit module, feedback circuit module and pfc circuit module; Described pfc circuit module also is connected with the current rectifying and wave filtering circuit module of ac voltage signal input.
2. LED constant-current power supply circuit according to claim 1, it is characterized in that: described LED constant-current power supply circuit also comprises the sample circuit module, this sample circuit module is connected between DC output circuit and feedback circuit module.
3. LED constant-current power supply circuit according to claim 2, it is characterized in that: described sample circuit module comprises voltage sampling module and current sample module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101618375A CN103428946A (en) | 2012-05-23 | 2012-05-23 | LED constant current power source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101618375A CN103428946A (en) | 2012-05-23 | 2012-05-23 | LED constant current power source circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103428946A true CN103428946A (en) | 2013-12-04 |
Family
ID=49652901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101618375A Pending CN103428946A (en) | 2012-05-23 | 2012-05-23 | LED constant current power source circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103428946A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107041035A (en) * | 2017-04-25 | 2017-08-11 | 西安工业大学 | The measure and control device of LED electrical characteristic |
| CN108646839A (en) * | 2018-07-06 | 2018-10-12 | 广东奥普特科技股份有限公司 | A kind of constant-current circuit fast-response control device |
| CN112040604A (en) * | 2020-10-23 | 2020-12-04 | 东莞市擎洲光电科技有限公司 | Overload non-output driving power supply circuit |
-
2012
- 2012-05-23 CN CN2012101618375A patent/CN103428946A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107041035A (en) * | 2017-04-25 | 2017-08-11 | 西安工业大学 | The measure and control device of LED electrical characteristic |
| CN108646839A (en) * | 2018-07-06 | 2018-10-12 | 广东奥普特科技股份有限公司 | A kind of constant-current circuit fast-response control device |
| CN112040604A (en) * | 2020-10-23 | 2020-12-04 | 东莞市擎洲光电科技有限公司 | Overload non-output driving power supply circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2010132625A3 (en) | Electronic circuit for dc conversion of fluorescent lighting ballast | |
| CN101998732A (en) | Driving apparatus for light emitting diodes | |
| EP3160025B1 (en) | Voltage set-up automatic matching circuits | |
| CN203193980U (en) | Drive circuit for multi-channel dimmable LED (light-emitting diode) lamp tube | |
| CN102076152A (en) | Power-adjustable LED constant current source | |
| CN103428946A (en) | LED constant current power source circuit | |
| CN103068129A (en) | Light-emitting diode (LED) driving power supply | |
| CN103338560A (en) | LED supply circuit | |
| CN202750273U (en) | LED (Light Emitting Diode) constant-current power supply circuit | |
| CN104363679A (en) | Dynamic voltage control-based single-stage PFC (power factor correction) flyback LED driving source | |
| KR20100113013A (en) | Ac led module with a current regulative diode | |
| JP6182972B2 (en) | Lighting device and lighting device | |
| CN202127528U (en) | Novel flat-panel LED (light-emitting diode) switch power supply | |
| CN204206529U (en) | A kind of high efficiency extra small power non-isolated LED drive circuit | |
| CN104684227B (en) | LED intelligent dimming driving circuit | |
| CN103249204A (en) | Built-in drive power supply of LED fluorescent lamp | |
| CN203661373U (en) | Solar and mains supply-compatible warning lamp | |
| CN203015236U (en) | A LED driving power supply | |
| CN103619093A (en) | A LED integrated light source | |
| CN102111936A (en) | Light emitting diode (LED) driving power supply | |
| CN103428943A (en) | LED driving power source circuit | |
| CN103826353A (en) | LED-based driving power supply for sunshine-imitating light source | |
| CN203423826U (en) | Led power supply circuit | |
| CN204350406U (en) | A kind of isolation drive power supply of LED illumination lamp | |
| CN106972763A (en) | A kind of LED power |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131204 |