CN203260998U - Charging protection circuit of USB interface used for vehicle - Google Patents
Charging protection circuit of USB interface used for vehicle Download PDFInfo
- Publication number
- CN203260998U CN203260998U CN 201220672070 CN201220672070U CN203260998U CN 203260998 U CN203260998 U CN 203260998U CN 201220672070 CN201220672070 CN 201220672070 CN 201220672070 U CN201220672070 U CN 201220672070U CN 203260998 U CN203260998 U CN 203260998U
- Authority
- CN
- China
- Prior art keywords
- usb interface
- current
- power supply
- usb
- fuse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a charging protection circuit of a USB interface used for a vehicle. The circuit comprises a USB interface and a power supply. The protection circuit is disposed between the USB interface and the power supply. The protection circuit comprises a fuse, and a power switching control and current protection IC. Maximum current the fuse allows is 750 mA, and maximum current the power switching control and current protection IC allows is 750 mA. When input current exceeds 750 mA, the circuit shuts down USB output in 2 ms. Through adding the protection circuit between the USB interface and the power supply, the charging protection circuit continuously detects USB current. When current of the circuit is excessive, the fuse is burnt out, the power switching control and current protection IC cuts off power supply, and the power supply is cut off, so that the power supply does not supply power for the USB interface, thereby protecting the USB interface and circuit components from being damaged. When an USB device is removed, normal operation is restored.
Description
Technical field
The utility model relates to the charge protector that a kind of automobile is used USB interface.
Background technology
Along with increasing electronic equipment uses the USB interface charging, the USB interface that a lot of users also use automobile to be furnished with is charged.USB interface is the most general a kind of interface, and the electronic equipment of USB interface is more diversified, and except powering for USB flash disk, other electronic equipment also uses, such as mobile phone, massager etc.The charging inlet absorption maximum electric current of mobile phone is 1800mA in " People's Republic of China's communication industry standard ", than the 500mA in USB 2.0 standards large 1300mA, if the user uses USB interface that main system of audio provides to cell-phone charging, cause damage can for like this components and parts such as automobile USB interface.For fear of problems, usb circuit is increased charging protection function, the restriction output current.
The utility model content
Technical problem to be solved in the utility model is to provide the charge protector of a kind of automobile with USB interface for problems of the prior art, its objective is when guaranteeing to use the charging of automobile USB interface and can the automobile USB interface not cause damage.
To be this kind automobile comprise USB interface and power supply with the charge protector of USB interface to the technical solution of the utility model; be provided with protective circuit between described USB interface and the power supply; described protective circuit comprises a fuse and the control of mains switch and current protection IC; and described fuse and the control of mains switch and current protection IC are equipped with the maximum that allows electric current to pass through; when output current surpasses set point; described mains switch control and current protection IC produce over-current signal, close USB output in the 2ms.
The maximum current that described fuse allows to pass through is 750mA.
The maximum current that described mains switch control and current protection IC allow to pass through is 750mA.
This kind automobile with said structure has the following advantages with the charge protector of USB interface:
1. this kind automobile passes through to increase a segment protect circuit with the charge protector of USB interface between USB interface and power supply, constantly the USB electric current is checked, when excessive by the electric current of circuit, blown fuse, mains switch control and current protection IC cut off power supply, cut off power supply, no longer to the USB interface power supply, thereby protected USB interface and circuit elements device not to be damaged; When removing USB device, recover normal operation.
2. this kind automobile can provide the supply current of 750mA with the USB port maximum of the charge protector of USB interface; so the fuse in the protective circuit and mains switch control and current protection IC are set to 750mA; supply current less than 750mA is provided; when assurance is powered to USB device, can not burn again USB circuit elements device.
Description of drawings
Below in conjunction with accompanying drawing utility model is described further:
Fig. 1 is the charge protector schematic diagram of utility model.
In Fig. 1,1: fuse; 2: mains switch control and current protection IC.
Embodiment
By structure shown in Figure 1 as can be known; this kind automobile comprises USB interface and power supply with the charge protector of USB interface; be provided with protective circuit between described USB interface and the power supply, described protective circuit comprises a fuse 1 and the control of mains switch and current protection IC2.
The maximum current that fuse 1 allows to pass through is 750mA, and the maximum current that mains switch control and current protection IC2 allow to pass through is 750mA.When output current surpassed 750mA, described mains switch control and current protection IC2 produced over-current signal, close USB output in the 2ms.
The specific works process is: increase a 750mA fuse 1 in the USB circuit, when the set point of output current over insurance silk 1, power supply is cut off in fuse 1 fusing at once; Increase mains switch control and current protection IC2 in the USB circuit, the set point (being made as 750mA) that surpasses IC when output current will produce over-current signal, closes USB5V output in the 2ms.
Above scheme all is when being checked through large electric current, and power supply can to electronic equipment or the automobile USB interface cause damage when guaranteeing to charge by cutting off the electricity supply.
Claims (3)
1. an automobile is with the charge protector of USB interface; it is characterized in that: described charge protector comprises USB interface and power supply; be provided with protective circuit between described USB interface and the power supply; described protective circuit comprises a fuse (1) and the control of mains switch and current protection IC(2); and described fuse (1) and the control of mains switch and current protection IC(2) be equipped with the maximum that allows electric current to pass through; when output current surpasses set point; described mains switch control and current protection IC(2) produce over-current signal, close USB output in the 2ms.
2. a kind of automobile according to claim 1 is with the charge protector of USB interface, and it is characterized in that: the maximum current that described fuse (1) allows to pass through is 750mA.
3. a kind of automobile according to claim 1 and 2 is characterized in that: described mains switch control and current protection IC(2 with the charge protector of USB interface) maximum current that allows to pass through is 750mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220672070 CN203260998U (en) | 2012-12-07 | 2012-12-07 | Charging protection circuit of USB interface used for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220672070 CN203260998U (en) | 2012-12-07 | 2012-12-07 | Charging protection circuit of USB interface used for vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203260998U true CN203260998U (en) | 2013-10-30 |
Family
ID=49473536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220672070 Expired - Fee Related CN203260998U (en) | 2012-12-07 | 2012-12-07 | Charging protection circuit of USB interface used for vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203260998U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107139121A (en) * | 2017-06-30 | 2017-09-08 | 国网青海省电力公司检修公司 | Multi-functional secondary Speical screwdriver |
-
2012
- 2012-12-07 CN CN 201220672070 patent/CN203260998U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107139121A (en) * | 2017-06-30 | 2017-09-08 | 国网青海省电力公司检修公司 | Multi-functional secondary Speical screwdriver |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TW200719556A (en) | Circuit for charging protection | |
| CN104967156A (en) | System capable of releasing overcurrent protection state of battery | |
| CN103219778B (en) | 5V output mobile power supply | |
| CN104779671A (en) | Mobile charger | |
| CN203260998U (en) | Charging protection circuit of USB interface used for vehicle | |
| CN103872648A (en) | Overload protection method used for electric tool and circuit thereof | |
| CN204726243U (en) | There is the automobile starting power output circuit of protection to error-polarity connection of power supply | |
| CN203135389U (en) | Charging protection circuit for USB interface | |
| CN204441216U (en) | A kind of overload-alarm circuit breaker | |
| CN103855674A (en) | Charging protection circuit of USB interface | |
| CN103855675A (en) | Charging protection circuit of USB interface for automobile | |
| CN211351802U (en) | Wireless charging circuit adopting shunt method | |
| CN201698008U (en) | Device for displaying power information of battery in real time | |
| CN202721479U (en) | Temperature control current limiting safe mobile power supply | |
| CN202856008U (en) | Automatic power-off protection socket | |
| CN202334468U (en) | Sudden stop state releasing reset control circuit | |
| CN206023317U (en) | A kind of charging-discharging device for accumulator battery | |
| CN104682499A (en) | Charging protection device with voltage induction power-off function | |
| CN204554738U (en) | A kind of lamp switch operator guards | |
| CN103050939A (en) | Fire power-off protection circuit | |
| CN205863957U (en) | A kind of energy-saving mobile telephone transformator | |
| CN103640483A (en) | Vehicle intelligent power safety protector | |
| CN204131188U (en) | A kind of portable power source | |
| CN204559200U (en) | Portable power source | |
| CN204538728U (en) | Gravity sensing charging power-off protection apparatus and mobile phone, portable power source, Mobile phone housing, charger, data wire |
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: 20131030 Termination date: 20131207 |