CN202750266U - LED (Light Emitting Diode) driving power supply circuit - Google Patents
LED (Light Emitting Diode) driving power supply circuit Download PDFInfo
- Publication number
- CN202750266U CN202750266U CN 201220233898 CN201220233898U CN202750266U CN 202750266 U CN202750266 U CN 202750266U CN 201220233898 CN201220233898 CN 201220233898 CN 201220233898 U CN201220233898 U CN 201220233898U CN 202750266 U CN202750266 U CN 202750266U
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- circuit
- driving power
- pwm control
- power supply
- led
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Abstract
An LED (Light Emitting Diode) driving power supply circuit comprises a surge protection circuit, an input rectification filter circuit, a power conversion circuit and a rectification output circuit which are sequentially connected. The LED driving power supply circuit further comprises a PWM control circuit connected with the power conversion circuit, a feedback circuit connected with the rectification filter output circuit and the PWM control circuit, a PFC circuit connected with the input rectification filter circuit and the PWM control circuit. The LED driving power supply circuit further comprises an over-voltage/under-voltage protection circuit and an output protection circuit. The LED driving power supply circuit has the advantages of high efficiency and high PF (Power Factor) value, and a short-circuit protection circuit, an over-current protection circuit and an over-voltage protection circuit are added at an output terminal, providing high safety and effectively protecting the LED lamp connected with the power supply circuit.
Description
Technical field
The utility model relates to a kind of power circuit, is specifically related to a kind of LED driving power circuit.
Background technology
LED (Light Emitting Diode, light-emitting diode) has the advantages such as environmental protection, energy-conservation, life-span length, high brightness, LED must be the trend of future development as a kind of novel green light source product, and 21st century will enter the novel illumination light source epoch take LED as representative.Since the LED self character determined its driving power can not with the ordinary incandescent lamp same driving power of sampling, in order to avoid voltage fluctuation causes electric current to increase and LED is damaged, thereby must design new driving power fully to satisfy the LED required driving requirement of working.Because the quality of driving power is determining the life-span of LED to a great extent, therefore, the development and Design of LED driving power circuit is subject to people's attention all the more.
The utility model content
For overcoming the problem of the deficiencies in the prior art and existence, the utility model provides a kind of LED driving power circuit that has efficient height, power factor height and have over-voltage over-current protection.
The utility model is achieved through the following technical solutions: a kind of LED driving power circuit; comprise successively interconnective surge protection circuit, input rectifying filter circuit, power conversion circuit and rectifying output circuit; it is characterized in that: described LED driving power circuit also comprises the pwm control circuit that is connected with power conversion circuit; the feedback circuit that is connected with current rectifying and wave filtering circuit and pwm control circuit is with the pfc circuit of input rectifying filter circuit and pwm control circuit.
Described LED driving power circuit also comprises input overvoltage/under-voltage protecting circuit and output protection circuit, described input overvoltage/under-voltage protecting circuit and input rectifying filter circuit, pwm control circuit and pfc circuit be connected; Described output protection circuit is connected with rectifying output circuit and pwm control circuit.
Further, described output protection circuit comprises short-circuit protection circuit, current foldback circuit and overvoltage crowbar.
The utlity model has efficient height, PF (Power Factor; power factor (PF)) value is high; the utility model has also increased short-circuit protection circuit, current foldback circuit and overvoltage crowbar at output simultaneously, and fail safe is good, can protect well the LED light fixture that is attached thereto use.
Description of drawings
Fig. 1 is schematic block circuit diagram of the present utility model.
Embodiment
Understanding for the ease of those skilled in the art is described in further detail the utility model below in conjunction with the drawings and specific embodiments.
As shown in Figure 1; a kind of LED driving power circuit; comprise successively interconnective surge protection circuit, input rectifying filter circuit, power conversion circuit and rectifying output circuit; it is characterized in that: described LED driving power circuit also comprises the pwm control circuit that is connected with power conversion circuit; the feedback circuit that is connected with current rectifying and wave filtering circuit and pwm control circuit is with the pfc circuit of input rectifying filter circuit and pwm control circuit.
Described LED driving power circuit also comprises input overvoltage/under-voltage protecting circuit and output protection circuit, described input overvoltage/under-voltage protecting circuit and input rectifying filter circuit, pwm control circuit and pfc circuit be connected; Described output protection circuit is connected with rectifying output circuit and pwm control circuit.
Described output protection circuit comprises short-circuit protection circuit, current foldback circuit and overvoltage crowbar.
The utility model is provided with input overvoltage/under-voltage protecting circuit at the AC signal input, and when voltage net appearance fluctuation was larger, input overvoltage/under-voltage protecting circuit energy output correlation signal quit work power supply, with the protection power source circuit.The utility model has also increased short-circuit protection circuit, current foldback circuit and overvoltage crowbar at the d. c. voltage signal output, when abnormal conditions appear in power supply, can protect well the LED light fixture that is attached thereto use.
Above-described embodiment is better implementation of the present utility model, is not to be to restriction of the present utility model, and under the prerequisite that does not break away from inventive concept of the present utility model, any apparent replacement is all within protection range of the present utility model.
Claims (3)
1. LED driving power circuit; comprise successively interconnective surge protection circuit, input rectifying filter circuit, power conversion circuit and rectifying output circuit; it is characterized in that: described LED driving power circuit also comprises the pwm control circuit that is connected with power conversion circuit; the feedback circuit that is connected with current rectifying and wave filtering circuit and pwm control circuit is with the pfc circuit of input rectifying filter circuit and pwm control circuit.
2. according to claim 1, it is characterized in that: described LED driving power circuit also comprises input overvoltage/under-voltage protecting circuit and output protection circuit, described input overvoltage/under-voltage protecting circuit and input rectifying filter circuit, pwm control circuit and pfc circuit be connected; Described output protection circuit is connected with rectifying output circuit and pwm control circuit.
3. according to claim 2, it is characterized in that: described output protection circuit comprises short-circuit protection circuit, current foldback circuit and overvoltage crowbar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220233898 CN202750266U (en) | 2012-05-23 | 2012-05-23 | LED (Light Emitting Diode) driving power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220233898 CN202750266U (en) | 2012-05-23 | 2012-05-23 | LED (Light Emitting Diode) driving power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202750266U true CN202750266U (en) | 2013-02-20 |
Family
ID=47709611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220233898 Expired - Fee Related CN202750266U (en) | 2012-05-23 | 2012-05-23 | LED (Light Emitting Diode) driving power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202750266U (en) |
-
2012
- 2012-05-23 CN CN 201220233898 patent/CN202750266U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130220 Termination date: 20130523 |