CN203800560U - USB interface short circuit protection circuit - Google Patents
USB interface short circuit protection circuit Download PDFInfo
- Publication number
- CN203800560U CN203800560U CN201420208372.9U CN201420208372U CN203800560U CN 203800560 U CN203800560 U CN 203800560U CN 201420208372 U CN201420208372 U CN 201420208372U CN 203800560 U CN203800560 U CN 203800560U
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- China
- Prior art keywords
- usb interface
- pin
- chip
- circuit
- capacitor
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- Expired - Fee Related
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Abstract
The utility model discloses a USB interface short circuit protection circuit, comprising a single-chip computer. The USB interface short circuit protection circuit also comprises an USB interface protection chip, an electrolytic capacitor CE1 and a capacitor C1; the GND pin of the USB interface protection chip is connected to a public grounding terminal; IN pin of the USB interface protection chip is connected to a 5V power supply; the EN1 pin and the EN2 pin of the USB interface protection chip are connected to the single-chip computer; the OC1 pin and the OC2 pin of the USB interface protection chip are connected to the single-chip computer; the OUT1 pin and the OUT2 pin of the USB interface protection chip are connected to the anode of the electrolytic capacitor CE1 and one terminal of the capacitor C1; and the cathode of the electrolytic capacitor CE1 and one terminal of the capacitor C1 are connected to the public grounding terminal. The protection circuit disclosed by the utility model can prevent the components from being damaged or prevent the USB interface from burning up.
Description
Technical field
The utility model relates to a kind of USB interface short-circuit protection circuit.
Background technology
The usb circuit of prior art comprises single-chip microcomputer and interface circuit, and described single-chip microcomputer is connected with interface circuit.It is provided a signal and is opened or closed the output of USB_5V by single product machine.The usb circuit of said structure has the following disadvantages in actual use procedure: this circuit, in the time of USB interface short circuit, easily causes the damage of components and parts or burning out of USB interface, thereby makes the functional reliability of prior art usb circuit lower.
Utility model content
The technical problems to be solved in the utility model is that a kind of USB interface short-circuit protection circuit that components and parts damage or USB interface burns out of can avoiding in the time of short circuit is provided.
The technical solution of the utility model is, a kind of USB interface short-circuit protection circuit is provided, and comprises single-chip microcomputer, and described USB interface short-circuit protection circuit also comprises USB interface protection chip, electrochemical capacitor CE1, capacitor C 1; The GND pin of described USB interface protection chip is connected with common ground end; The IN pin of described USB interface protection chip is connected with 5V power supply; The EN1 pin of described USB interface protection chip is all connected with single-chip microcomputer with EN2 pin; The OC1 pin of described USB interface protection chip is all connected with single-chip microcomputer with OC2 pin; The OUT1 pin of described USB interface protection chip is all connected with the positive pole of electrochemical capacitor CE1, one end of capacitor C 1 with OUT2 pin; The negative pole of described electrochemical capacitor CE1, the other end of capacitor C 1 are all connected with common ground end.
The model of described USB interface protection chip is BD8022FJ.
Adopt after above structure, the utility model compared with prior art, has the following advantages:
The utility model USB interface short-circuit protection circuit is in the time that chip pin OC1/OC2 detects that electric current by chip is excessive, and it feeds back to single-chip microcomputer in time, and single-chip microcomputer is made corresponding action, provides a signal, and chip can close circuit network USB_5V output.When chip pin OC1/OC2 detects by the electric current of chip normally, it also can feed back to single-chip microcomputer in time, and single-chip microcomputer also can be made corresponding action, provides a signal, and chip can be opened network USB_5V output.This circuit, in the time of USB interface short circuit, can not cause the damage of components and parts or burning out of USB interface like this, thereby makes the functional reliability of the utility model usb circuit higher.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of the utility model USB interface short-circuit protection circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, a kind of USB interface short-circuit protection circuit of the utility model, comprises single-chip microcomputer, and described USB interface short-circuit protection circuit also comprises USB interface protection chip, electrochemical capacitor CE1, capacitor C 1; The GND pin of described USB interface protection chip is connected with common ground end; The IN pin of described USB interface protection chip is connected with 5V power supply; The EN1 pin of described USB interface protection chip is all connected with the IO mouth of single-chip microcomputer with EN2 pin; The OC1 pin of described USB interface protection chip is all connected with the IO mouth of single-chip microcomputer with OC2 pin; The OUT1 pin of described USB interface protection chip is all connected with the positive pole of electrochemical capacitor CE1, one end of capacitor C 1 with OUT2 pin, and the positive pole of described solution capacitor C E1, one end of capacitor C 1 are voltage output end; The negative pole of described electrochemical capacitor CE1, the other end of capacitor C 1 are all connected with common ground end.
The model of described USB interface protection chip is BD8022FJ.
Operation principle: the utility model USB interface short-circuit protection circuit is in the time that chip pin OC1/OC2 detects that electric current by chip is excessive; it feeds back to single-chip microcomputer in time; single-chip microcomputer is made corresponding action, provides a signal, and chip can close circuit network USB_5V output.When chip pin OC1/OC2 detects by the electric current of chip normally, it also can feed back to single-chip microcomputer in time, and single-chip microcomputer also can be made corresponding action, provides a signal, and chip can be opened network USB_5V output.
Below be only described with regard to most preferred embodiment of the present utility model, but can not be interpreted as it is limitations on claims.The utility model is not limited only to above embodiment, and its concrete structure allows to change.In every case the various variations of doing in the protection range of the utility model independent claims are all in protection range of the present utility model.
Claims (2)
1. a USB interface short-circuit protection circuit, comprises single-chip microcomputer, it is characterized in that: described USB interface short-circuit protection circuit also comprises USB interface protection chip, electrochemical capacitor CE1, capacitor C 1; The GND pin of described USB interface protection chip is connected with common ground end; The IN pin of described USB interface protection chip is connected with 5V power supply; The EN1 pin of described USB interface protection chip is all connected with single-chip microcomputer with EN2 pin; The OC1 pin of described USB interface protection chip is all connected with single-chip microcomputer with OC2 pin; The OUT1 pin of described USB interface protection chip is all connected with the positive pole of electrochemical capacitor CE1, one end of capacitor C 1 with OUT2 pin; The negative pole of described electrochemical capacitor CE1, the other end of capacitor C 1 are all connected with common ground end.
2. USB interface short-circuit protection circuit according to claim 1, is characterized in that: the model of described USB interface protection chip is BD8022FJ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420208372.9U CN203800560U (en) | 2014-04-25 | 2014-04-25 | USB interface short circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420208372.9U CN203800560U (en) | 2014-04-25 | 2014-04-25 | USB interface short circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203800560U true CN203800560U (en) | 2014-08-27 |
Family
ID=51382749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420208372.9U Expired - Fee Related CN203800560U (en) | 2014-04-25 | 2014-04-25 | USB interface short circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203800560U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105826894A (en) * | 2015-06-25 | 2016-08-03 | 维沃移动通信有限公司 | Charging short-circuit protection device of power supply equipment and power supply equipment |
-
2014
- 2014-04-25 CN CN201420208372.9U patent/CN203800560U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105826894A (en) * | 2015-06-25 | 2016-08-03 | 维沃移动通信有限公司 | Charging short-circuit protection device of power supply equipment and power supply equipment |
| CN105826894B (en) * | 2015-06-25 | 2018-06-26 | 维沃移动通信有限公司 | The charging short-circuit protection and power-supply device of power-supply device |
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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: 20140827 Termination date: 20180425 |