CN210405726U - LED drive circuit with USB charging circuit - Google Patents
LED drive circuit with USB charging circuit Download PDFInfo
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- CN210405726U CN210405726U CN201921217871.3U CN201921217871U CN210405726U CN 210405726 U CN210405726 U CN 210405726U CN 201921217871 U CN201921217871 U CN 201921217871U CN 210405726 U CN210405726 U CN 210405726U
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- circuit
- usb charging
- constant voltage
- output circuit
- pwm
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Abstract
The utility model provides a take LED drive circuit of USB charging circuit, is including the AC rectifier circuit of connecting the commercial power, the LED drive circuit who connects AC rectifier circuit, still including the USB charging circuit, the USB charging circuit includes PWM constant voltage control output circuit and constant voltage rectification output circuit, AC rectifier circuit, PWM constant voltage control output circuit, constant voltage rectification output circuit electricity in proper order connect. The utility model provides a take USB charging circuit's LED drive circuit makes the LED equipment that possesses this circuit have USB function of charging, convenient and practical.
Description
Technical Field
The utility model relates to a take USB charging circuit's LED drive circuit.
Background
At present, the existing LED lamp generally has only a lighting function, but with frequent use of mobile equipment of people, the LED lamp with a USB charging power supply function is in urgent need of being invented, and a corresponding circuit needs to be added with a USB charging circuit on the basis of an LED driving circuit.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a take USB charging circuit's LED drive circuit to solve above-mentioned prior art not enough.
In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a take LED drive circuit of USB charging circuit, is including the AC rectifier circuit of connecting the commercial power, the LED drive circuit who connects AC rectifier circuit, still including the USB charging circuit, the USB charging circuit includes PWM constant voltage control output circuit and constant voltage rectification output circuit, AC rectifier circuit, PWM constant voltage control output circuit, constant voltage rectification output circuit electricity in proper order connect.
Further, the PWM constant voltage control output circuit includes a PWM constant voltage control chip, and the model of the PWM constant voltage control chip is OB 2571.
Further, the LED driving circuit comprises a PWM constant current control output circuit and a constant current rectification output circuit, and the AC rectification circuit, the PWM constant current control output circuit and the constant current rectification output circuit are electrically connected in sequence.
Further, the PWM constant current control output circuit comprises a PWM constant current control chip, and the model of the PWM constant current control chip is MT 7941.
Further, the AC rectifying circuit comprises an AC rectifying chip, the input end of the AC rectifying chip is connected with an external commercial power supply, and the output end of the AC rectifying chip outputs direct-current voltage.
Furthermore, the output end of the AC rectifying circuit is also connected with a filter circuit, and the input end of the filter circuit is connected with the output end of the AC rectifying chip.
Further, the filter circuit is a C-L-C filter circuit.
Further, a first transformer is arranged between the PWM constant voltage control output circuit and the constant voltage rectification output circuit.
Further, a second transformer is arranged between the PWM constant-current control output circuit and the constant-current rectification output circuit.
The utility model discloses an useful part lies in: the LED driving circuit with the USB charging circuit is provided, so that the LED equipment with the circuit has the USB charging function, and is convenient and practical.
Drawings
Fig. 1 is a functional block diagram of the present invention.
Fig. 2 is a schematic circuit diagram of the AC rectifier circuit and the filter circuit of the present invention.
Fig. 3 is a schematic circuit diagram of the USB charging circuit of the present invention.
Fig. 4 is a schematic circuit diagram of the LED driving circuit of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1-4, a take LED drive circuit of USB charging circuit, including AC rectifier circuit 1, the LED drive circuit who connects AC rectifier circuit of connecting the commercial power, still including the USB charging circuit, the USB charging circuit includes PWM constant voltage control output circuit 2 and constant voltage rectification output circuit 3, AC rectifier circuit, PWM constant voltage control output circuit, constant voltage rectification output circuit electricity are connected in proper order, and the mouth that charges is connected to constant voltage rectification output circuit's output V +, V-for charge for outside mobile device or the treasured that charges.
In this embodiment, the PWM constant voltage control output circuit includes a PWM constant voltage control chip U1, and the model of the PWM constant voltage control chip is OB 2571.
In this embodiment, the LED driving circuit includes a PWM constant current control output circuit 5 and a constant current rectification output circuit 6, the AC rectification circuit, the PWM constant current control output circuit, and the constant current rectification output circuit are electrically connected in sequence, and an output end LED +, an output end LED-of the constant current rectification output circuit are connected to an LED load.
In this embodiment, the PWM constant current control output circuit includes a PWM constant current control chip U2, the model of the PWM constant current control chip is MT7941, and switches K1 and K2 are provided between the power input terminal of U2 and HV.
In this embodiment, the AC rectifying circuit includes an AC rectifying chip U3, an input end of the AC rectifying chip is connected to an external commercial power supply, and an output end of the AC rectifying chip outputs a dc voltage.
In this embodiment, the output end of the AC rectification circuit is further connected to a filter circuit 8, and the input end of the filter circuit is connected to the output end of the AC rectification chip.
In this embodiment, the filter circuit is a C-L-C filter circuit, and the output end of the C-L-C filter circuit outputs a DC voltage HV.
In this embodiment, a first transformer T1 is disposed between the PWM constant voltage control output circuit and the constant voltage rectification output circuit.
In this embodiment, a second transformer T2 is disposed between the PWM constant-current control output circuit and the constant-current rectification output circuit.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.
Claims (9)
1. The utility model provides a take USB charging circuit's LED drive circuit, includes the AC rectifier circuit of connecting the commercial power, connects the LED drive circuit of AC rectifier circuit, its characterized in that: the USB charging circuit comprises a PWM constant voltage control output circuit and a constant voltage rectification output circuit, and the AC rectifying circuit, the PWM constant voltage control output circuit and the constant voltage rectification output circuit are electrically connected in sequence.
2. The LED driving circuit with a USB charging circuit according to claim 1, wherein: the PWM constant voltage control output circuit comprises a PWM constant voltage control chip, and the model of the PWM constant voltage control chip is OB 2571.
3. The LED driving circuit with a USB charging circuit according to claim 1, wherein: the LED driving circuit comprises a PWM constant current control output circuit and a constant current rectification output circuit, and the AC rectification circuit, the PWM constant current control output circuit and the constant current rectification output circuit are electrically connected in sequence.
4. The LED driving circuit with a USB charging circuit according to claim 3, wherein: the PWM constant current control output circuit comprises a PWM constant current control chip, and the model of the PWM constant current control chip is MT 7941.
5. The LED driving circuit with a USB charging circuit according to claim 1, wherein: the AC rectifying circuit comprises an AC rectifying chip, the input end of the AC rectifying chip is connected with an external commercial power supply, and the output end of the AC rectifying chip outputs direct-current voltage.
6. The LED driving circuit with a USB charging circuit according to claim 5, wherein: the output end of the AC rectifying circuit is also connected with a filter circuit, and the input end of the filter circuit is connected with the output end of the AC rectifying chip.
7. The LED driver circuit with USB charging circuit of claim 6 wherein: the filter circuit is a C-L-C filter circuit.
8. The LED driving circuit with a USB charging circuit according to claim 1, wherein: and a first transformer is arranged between the PWM constant voltage control output circuit and the constant voltage rectification output circuit.
9. The LED driving circuit with a USB charging circuit according to claim 3, wherein: and a second transformer is arranged between the PWM constant-current control output circuit and the constant-current rectification output circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921217871.3U CN210405726U (en) | 2019-07-31 | 2019-07-31 | LED drive circuit with USB charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921217871.3U CN210405726U (en) | 2019-07-31 | 2019-07-31 | LED drive circuit with USB charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210405726U true CN210405726U (en) | 2020-04-24 |
Family
ID=70357387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921217871.3U Active CN210405726U (en) | 2019-07-31 | 2019-07-31 | LED drive circuit with USB charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210405726U (en) |
-
2019
- 2019-07-31 CN CN201921217871.3U patent/CN210405726U/en active Active
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