CN201515520U - PWM chip LED constant current circuit with protection and power factor compensation functions - Google Patents
PWM chip LED constant current circuit with protection and power factor compensation functions Download PDFInfo
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- CN201515520U CN201515520U CN2009200808573U CN200920080857U CN201515520U CN 201515520 U CN201515520 U CN 201515520U CN 2009200808573 U CN2009200808573 U CN 2009200808573U CN 200920080857 U CN200920080857 U CN 200920080857U CN 201515520 U CN201515520 U CN 201515520U
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- 239000003990 capacitor Substances 0.000 claims description 29
- 230000005669 field effect Effects 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
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Abstract
The utility model discloses a PWM chip LED constant current circuit with protection and power factor compensation functions, which belongs to the electronic circuit technology, solves the problems that the LED lamp constant current circuit in the prior art has complicated structure, low power utilization rate and low power factor, and comprises a protection circuit, a rectifier circuit, a filter circuit, a power factor compensation circuit, a PWM chip control circuit and a rectifier and constant current output circuit which are connected with each other sequentially. By utilizing the circuits, the surge circuit can be effectively resisted, and the high current can be prevented from burning LEDs and a PWM chip instantaneously, and simultaneously, other accidents caused by short circuit can be prevented; when the constant current power is stably output and the normal use of LED lamps is ensured, the power consumption of the circuit can be reduced, and the power utilization can be improved; and the power factor of the circuit can be improved, the production cost can be reduced, and the pollution of power grid can be reduced.
Description
Technical field
The utility model relates to a kind of constant-current circuit, specifically, relates to a kind of PWM chip LED constant-current circuit with defencive function and power factor compensation.
Background technology
At present, the LED lamp obviously is applied in the various circuit more and more because of its result of use.Make LED lamp operate as normal, circuit is assisted accordingly, as protective circuit, rectification circuit or the like.The control of existing LED circuit for lamp is very complicated, and the out-put supply poor stability, efficient is low, power factor is low, and electrical network is had pollution, and cost is higher, is unfavorable for the popularization of LED lamp.
The utility model content
The purpose of this utility model is to provide a kind of PWM chip LED constant-current circuit with defencive function and power factor compensation, overcomes prior art problems, reduces cost under the prerequisite that guarantees the normal use of LED lamp.
To achieve these goals, the technical solution adopted in the utility model is as follows:
The PWM chip LED constant-current circuit of band defencive function and power factor compensation comprises the protective circuit, rectification circuit, filter circuit, power factor compensation circuit, PWM chip controls circuit and the rectification constant current output circuit that connect successively.
Described protective circuit is made of thermistor and insurance, can effectively resist the surge circuit, prevents that instantaneous large-current from burning LED and PWM chip, prevents that simultaneously short circuit from causing other accidents; Described rectification circuit is made of rectifier bridge, is used for AC rectification is become direct current; Described filtered electrical routing capacitance constitutes; Described power factor compensation circuit is made of a plurality of electric capacity and a plurality of diode, is used for compensating circuit voltage and power factor; Described PWM chip controls circuit is made of PWM chip, power field effect pipe, frequency modulation resistance, current-limiting resistance, the electric current that compares current-limiting resistance by the PWM chip, the duty ratio of power controlling field effect transistor, reach the purpose of efficient out-put supply, frequency modulation resistance adjustment PWM chip frequency reaches the efficient purpose of moving of circuit; Described rectification constant current output circuit is made up of diode, inductance, electric capacity, guarantees circuit constant current efficiently output.
Adopt scheme described in the utility model, not needing complicated control circuit is exportable constant-current supply, can be when ensureing the normal use of LED lamp, reduce power loss, the raising power utilization of circuit, improve the power factor of circuit, reduce production costs, reduce pollution electrical network.
The utility model is mainly used in the LED lamp control circuit.
Description of drawings
Fig. 1 is a system block diagram of the present utility model.
Fig. 2 is the circuit theory diagrams of the utility model-embodiment.
Embodiment
Embodiment
As shown in Figure 1 and Figure 2, the PWM chip LED constant-current circuit of band defencive function and power factor compensation comprises protective circuit, rectification circuit, filter circuit, power factor compensation circuit, PWM chip controls circuit and rectification constant current output circuit.
Wherein, protective circuit is made up of thermistor NTC and insurance FS1, and the input of thermistor NTC links to each other with the input positive source, and the input of insurance FS1 links to each other with the input power cathode.Rectification circuit is made of a rectifier bridge D1-4, and the A node of rectifier bridge D1-4 links to each other with thermistor NTC output, and the B node links to each other with insurance FS1 output.Filter circuit is made of capacitor C 1, and capacitor C 1 one ends are connected with the C node of rectifier bridge, and the other end is connected with the D node of rectifier bridge.Power factor compensation circuit is made of capacitor C 2, capacitor C 3, diode D5, diode D6, diode D7; An end links to each other with the D node of rectifier bridge after capacitor C 2 and the diode D7 parallel connection, and the capacitor C 3 after the other end and the parallel connection is connected with the end of diode D6, and the capacitor C 3 after the parallel connection links to each other with the C node of rectifier bridge with the other end of diode D6; Diode D5 one end links to each other with the tie point of capacitor C 2 with diode D6, and the other end links to each other with the tie point of capacitor C 3 with diode D7.PWM chip controls circuit is made of PWM chip, power field effect pipe, frequency modulation resistance R 1, current-limiting resistance R2, regulating resistor R3, pressure regulation capacitor C 4; Frequency modulation resistance R 1 one ends are connected with the PWM chip, and the other end is connected with the C node of rectifier bridge; Current-limiting resistance R2 is connected with the C node of rectifier bridge with pressure regulation capacitor C 4 series connection backs one end, and the other end is connected with the D node of rectifier bridge, and current-limiting resistance R2 also is connected with the PWM chip with the tie point of pressure regulation capacitor C 4; Regulating resistor R3 is with after PWM is in parallel, and an end is connected with the C node of rectifier bridge, and the other end is connected with power field effect pipe; Power field effect pipe also is connected with the PWM chip.The rectification constant current output circuit is made of diode D8, inductance L 1, capacitor C 5, diode D8 is with in parallel with capacitor C 5 again after inductance L 1 is connected, back in parallel one end links to each other with the D node of rectifier bridge, and diode D8 also is connected with power field effect pipe with the tie point of inductance L 1.The two ends of capacitor C 5 for the LED lamp is exported constant current efficiently, guarantee the operate as normal of LED as the output of entire circuit.
Claims (7)
1. the PWM chip LED constant-current circuit of band defencive function and power factor compensation is characterized in that, comprises the protective circuit, rectification circuit, filter circuit, power factor compensation circuit, PWM chip controls circuit and the rectification constant current output circuit that connect successively.
2. LED constant-current circuit according to claim 1 is characterized in that, described protective circuit is made up of thermistor NTC and insurance FS1.
3. LED constant-current circuit according to claim 2 is characterized in that, described rectification circuit is made of a rectifier bridge D1-4, and the A node of rectifier bridge D1-4 links to each other with thermistor NTC, and the B node links to each other with insurance FS1.
4. LED constant-current circuit according to claim 3 is characterized in that described filter circuit is made of capacitor C 1, and capacitor C 1 one ends are connected with the C node of rectifier bridge, and the other end is connected with the D node of rectifier bridge.
5. LED constant-current circuit according to claim 4 is characterized in that, described power factor compensation circuit is made of capacitor C 2, capacitor C 3, diode D5, diode D6, diode D7; An end links to each other with the D node of rectifier bridge after capacitor C 2 and the diode D7 parallel connection, and the capacitor C 3 after the other end and the parallel connection is connected with the end of diode D6, and the capacitor C 3 after the parallel connection links to each other with the C node of rectifier bridge with the other end of diode D6; Diode D5 one end links to each other with the tie point of capacitor C 2 with diode D6, and the other end links to each other with the tie point of capacitor C 3 with diode D7.
6. LED constant-current circuit according to claim 5 is characterized in that, described PWM chip controls circuit is made of PWM chip, power field effect pipe, frequency modulation resistance R 1, current-limiting resistance R2, regulating resistor R3, pressure regulation capacitor C 4; Frequency modulation resistance R 1 one ends are connected with the PWM chip, and the other end is connected with the C node of rectifier bridge; Current-limiting resistance R2 is connected with the C node of rectifier bridge with pressure regulation capacitor C 4 series connection backs one end, and the other end is connected with the D node of rectifier bridge, and current-limiting resistance R2 also is connected with the PWM chip with the tie point of pressure regulation capacitor C 4; Regulating resistor R3 is with after PWM is in parallel, and an end is connected with the C node of rectifier bridge, and the other end is connected with power field effect pipe; Power field effect pipe also is connected with the PWM chip.
7. LED constant-current circuit according to claim 6, it is characterized in that, described rectification constant current output circuit is made of diode D8, inductance L 1, capacitor C 5, diode D8 is with in parallel with capacitor C 5 again after inductance L 1 is connected, back in parallel one end links to each other with the D node of rectifier bridge, and diode D8 also is connected with power field effect pipe with the tie point of inductance L 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200808573U CN201515520U (en) | 2009-05-14 | 2009-05-14 | PWM chip LED constant current circuit with protection and power factor compensation functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200808573U CN201515520U (en) | 2009-05-14 | 2009-05-14 | PWM chip LED constant current circuit with protection and power factor compensation functions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201515520U true CN201515520U (en) | 2010-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200808573U Expired - Fee Related CN201515520U (en) | 2009-05-14 | 2009-05-14 | PWM chip LED constant current circuit with protection and power factor compensation functions |
Country Status (1)
| Country | Link |
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| CN (1) | CN201515520U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102006702A (en) * | 2010-12-10 | 2011-04-06 | 阳江市汉能工业有限公司 | Driving device of light-emitting diode (LED) fluorescent tube |
| CN102128435A (en) * | 2010-07-28 | 2011-07-20 | 林世凯 | Power supply driver |
-
2009
- 2009-05-14 CN CN2009200808573U patent/CN201515520U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128435A (en) * | 2010-07-28 | 2011-07-20 | 林世凯 | Power supply driver |
| CN102006702A (en) * | 2010-12-10 | 2011-04-06 | 阳江市汉能工业有限公司 | Driving device of light-emitting diode (LED) fluorescent tube |
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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: 20100623 Termination date: 20110514 |