CN201087925Y - Short-circuit protection circuit of I/O connector - Google Patents
Short-circuit protection circuit of I/O connector Download PDFInfo
- Publication number
- CN201087925Y CN201087925Y CNU2007200069801U CN200720006980U CN201087925Y CN 201087925 Y CN201087925 Y CN 201087925Y CN U2007200069801 U CNU2007200069801 U CN U2007200069801U CN 200720006980 U CN200720006980 U CN 200720006980U CN 201087925 Y CN201087925 Y CN 201087925Y
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- circuit
- connector
- short
- power supply
- control
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Protection Of Static Devices (AREA)
Abstract
The utility model discloses an I/O connector short circuit protective circuit, which is applied to an electronic product that comprises a system, a power supply, and an I/O connector. The short circuit protective circuit comprises a one-way circuit and a control circuit. The one-way circuit is connected between the anode of a power supply and the supply pin of an I/O connector and is used for controlling the direction of current and preventing the one-way circuit from generating inverse short circuit current. The control circuit consists of two pins and a control pin, the two pins are respectively connected to two ends of the one-way circuit, and the control pin is connected to a control signal pin of the system and used for controlling the power supply supplying the power for the outside. In the I/O connector short circuit protective circuit of the technical proposal, the one-way circuit is used for preventing the inverse current flowing under the condition that the supply pin short-circuits, the control circuit is used for controlling the power supply supplying the power for the outside, therefore, the utility model can not only cause the both-way supplying capacity of the interface not to be influenced, but also can effectively protect the safety of the battery and ensure that the system operates normally and stably.
Description
Technical field
The utility model relates to a kind of parts of electronic product, particularly relates to a kind of I/O connector short-circuit protection circuit.
Background technology
Present electronic product, as mobile phone, extensive use has system's I/O connector, and this I/O connector provides abundant interface function such as power supply, charging, serial data exchange, USB, but generally lacks the corresponding protection measure.Use in the plug process the user, owing to defective on the connector construction or reason such as plug wearing and tearing etc., be easy to cause the energization pins short circuit, this moment is as if not having corresponding protection mechanism with regard to the entail dangers to cell safety and make the system can't operate as normal.
The utility model content
The utility model provides a kind of I/O connector short-circuit protection circuit, and it has overcome the existing deficiency that causes the energization pins short circuit easily of background technology.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of I/O connector short-circuit protection circuit; this short-circuit protection circuit is used for electronic product; this electronic product has system, power supply and I/O connector, and this short-circuit protection circuit includes an one-way circuit and a control circuit.One-way circuit is connected between the power supply pin of the positive pole of power supply and I/O connector, is used for the Control current direction and prevents the one-way circuit of reverse short circuit current.Control circuit has two connecting pins and a control pin, and this two connecting pin is connected to the two ends of one-way circuit, and this control pin is connected in the system control signal pin, is used to control power supply and outwards powers.
In the utility model one preferred embodiment, this electronic product is a mobile phone, and this power supply is a battery.
In the utility model one preferred embodiment, this I/O connector is a USB connector.
In the utility model one preferred embodiment, this one-way circuit includes diode, and this diode anode is connected to the power supply pin of I/O connector, and negative electrode is connected to the positive pole of power supply.
In the utility model one preferred embodiment, this control circuit includes metal-oxide-semiconductor, and the grid of this metal-oxide-semiconductor is a control pin, and the source electrode of this metal-oxide-semiconductor, drain electrode are connecting pin.
In the utility model one preferred embodiment, this metal-oxide-semiconductor is the P channel MOS tube.
In the I/O connector short-circuit protection circuit of the technical program; one-way circuit is used for stoping under the situation that energization pins is short-circuited reverse current to flow through; control circuit is used to control power supply and outwards powers; therefore not only can make the bidirectional power supply ability of interface unaffected; but also can effectively protect cell safety, guarantee system's normal and stable operation.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 has illustrated the principle schematic of I/O connector short-circuit protection circuit of the present utility model.
Label declaration: 10 systems, 20 batteries, 30I/O connector, 40 one-way circuits, 50 control circuits, 60 short-circuit protection circuits.
Embodiment
See also Fig. 1, Fig. 1 has illustrated the principle schematic of I/O connector short-circuit protection circuit of the present utility model.A kind of I/O connector short-circuit protection circuit, this short-circuit protection circuit is used for electronic product, and this electronic product has system 10, battery 20 and I/O connector 30.In the present embodiment, electronic product is a mobile phone, and I/O connector is a USB connector, but not as limit, other electronic product such as MP3, PDA, MP4 etc. can be applicable to the technical program.
Short-circuit protection circuit 60 includes an one-way circuit 40 and a control circuit 50.This one-way circuit 40 includes diode, and this diode anode is connected to the power supply pin (VBAT pin) of I/O connector 30, and negative electrode is connected to the positive pole of battery 20.The diode of one-way circuit 40 has played the Control current direction, has prevented the effect of reverse short circuit current.This control circuit 50 includes the P channel MOS tube, and the grid G of this metal-oxide-semiconductor is control pin and the control signal pin that is connected in system 10, and source S is connected to the positive pole of battery 20, and this drain D is connected to the power supply pin of I/O connector 30.The metal-oxide-semiconductor of control circuit 50 is used for the control system battery and outwards powers.
Under the default conditions; this metal-oxide-semiconductor is in off state; this short-circuit protection circuit 60 is operated in the INPUT pattern; only allowing external power source to pass through the VBAT pin powers to cell phone system; also be that only to allow current direction be to flow to internal system from external power source by diode, produce line download, debugging, maintenance work thereby finish.In case VBAT pin short circuit this moment, diode is anti-inclined to one side, and protective circuit is cut off, and can prevent excessive reverse current, prevents destructive consequence.When plug inserts in the female seat fully and need system to provide power supply to peripheral hardware; system enters stable state (not had short circuit problem this moment) and sends a control signal to metal-oxide-semiconductor; this metal-oxide-semiconductor is in open mode; this short-circuit protection circuit 60 enters the OUTPUT pattern; thereby allow electric current to export to peripheral hardware by metal-oxide-semiconductor, thereby guaranteed that I/O connector bidirectional power supply ability is unaffected from battery.When system detects that power supply finishes or plug when extracting suddenly, send control signal immediately, turn-off metal-oxide-semiconductor, make short-circuit protection circuit 60 return the INPUT pattern, thereby prevent the short circuit problem that may occur in the withdrawal process.
The above, it only is the utility model preferred embodiment, so can not limit the scope that the utility model is implemented with this, i.e. the equivalence of doing according to the utility model claim and description changes and modifies, and all should still belong in the scope that the utility model patent contains.
Claims (6)
1. I/O connector short-circuit protection circuit, this short-circuit protection circuit is used for electronic product, and this electronic product has system, power supply and I/O connector, it is characterized in that: this short-circuit protection circuit includes:
One is used for the Control current direction and prevents the one-way circuit of reverse short circuit current, and this one-way circuit is connected between the power supply pin of the positive pole of power supply and I/O connector; And
One is used to control the outwards control circuit of power supply of power supply, and this control circuit has two connecting pins and a control pin, and this two connecting pin is connected to the two ends of one-way circuit, and this control pin is connected in the system control signal pin.
2. a kind of I/O connector short-circuit protection circuit according to claim 1 is characterized in that: this electronic product is a mobile phone, and this power supply is a battery.
3. a kind of I/O connector short-circuit protection circuit according to claim 2 is characterized in that: this I/O connector is a USB connector.
4. according to claim 1 or 2 or 3 described a kind of I/O connector short-circuit protection circuits, it is characterized in that: this one-way circuit includes diode, and this diode anode is connected to the power supply pin of I/O connector, and negative electrode is connected to the positive pole of power supply.
5. a kind of I/O connector short-circuit protection circuit according to claim 4, it is characterized in that: this control circuit includes metal-oxide-semiconductor, and the grid of this metal-oxide-semiconductor is a control pin, and the source electrode of this metal-oxide-semiconductor, drain electrode are connecting pin.
6. a kind of I/O connector short-circuit protection circuit according to claim 5 is characterized in that: this metal-oxide-semiconductor is the P channel MOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200069801U CN201087925Y (en) | 2007-04-30 | 2007-04-30 | Short-circuit protection circuit of I/O connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200069801U CN201087925Y (en) | 2007-04-30 | 2007-04-30 | Short-circuit protection circuit of I/O connector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201087925Y true CN201087925Y (en) | 2008-07-16 |
Family
ID=39635510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200069801U Expired - Fee Related CN201087925Y (en) | 2007-04-30 | 2007-04-30 | Short-circuit protection circuit of I/O connector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201087925Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102480125A (en) * | 2010-11-19 | 2012-05-30 | 英业达股份有限公司 | Current protection circuit for USB (Universal Serial Bus) interface |
| CN105406288A (en) * | 2015-11-09 | 2016-03-16 | 合肥宝龙达光电技术有限公司 | Connector contact short circuit prevention circuit structure |
| WO2016101254A1 (en) * | 2014-12-26 | 2016-06-30 | 华为技术有限公司 | Connector and charging system |
-
2007
- 2007-04-30 CN CNU2007200069801U patent/CN201087925Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102480125A (en) * | 2010-11-19 | 2012-05-30 | 英业达股份有限公司 | Current protection circuit for USB (Universal Serial Bus) interface |
| WO2016101254A1 (en) * | 2014-12-26 | 2016-06-30 | 华为技术有限公司 | Connector and charging system |
| CN106463974A (en) * | 2014-12-26 | 2017-02-22 | 华为技术有限公司 | Connector and charging system |
| CN105406288A (en) * | 2015-11-09 | 2016-03-16 | 合肥宝龙达光电技术有限公司 | Connector contact short circuit prevention circuit structure |
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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: 20080716 Termination date: 20140430 |