CN200941553Y - Short-circuit protective circuit of dc. power source - Google Patents
Short-circuit protective circuit of dc. power source Download PDFInfo
- Publication number
- CN200941553Y CN200941553Y CN 200620014411 CN200620014411U CN200941553Y CN 200941553 Y CN200941553 Y CN 200941553Y CN 200620014411 CN200620014411 CN 200620014411 CN 200620014411 U CN200620014411 U CN 200620014411U CN 200941553 Y CN200941553 Y CN 200941553Y
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- power supply
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Abstract
The utility model relates to a short circuit protection circuit for a DC power supply, which is applied in the circuit supplied by a DC power source or a battery, a short circuit protection circuit of the circuit charged by the battery. The short protection circuit for the DC power source is connected in series between the DC power source and the energized device, comprising a current sampler, a controller and a switch tube. The current sampler detects the current in the circuit and outputs the current to the controller. The controller controls on/off of the switch tube according the current value in the circuit. The short circuit protection circuit in the utility model doesn't dismantle the machine for replacement of fuse when short circuit is occurred, which is convenient and practicable, short circuit current during short circuit is small, the utility model also achieves function of current limitation protection and improves safety and reliability of the DC power supply and the energized device.
Description
Technical field
The utility model relates to a kind of short-circuit protection circuit of DC power supply, relates in particular to the short-circuit protection circuit in the circuit of DC power supply or battery-driven circuit and charge in batteries.
Background technology
What obtain by rectifying and wave-filtering method conversion AC power is DC power supply, and storage battery also is a kind of DC power supply.In the prior art; in order to prevent short circuit, protection DC source; in with the circuit of DC power supply and in the charging circuit of storage battery; in input circuit, be connected in series fuse; in case be short-circuited; electric current is excessive in the circuit, and fuse will fuse, thereby has avoided super-high-current to burn out DC source.
DC source is the vital power supply of communication system work, and short-circuit protection circuit is the critical component of protection DC source, and its performance quality directly has influence on the safety and the work of DC source and communication system.The short-circuit protection circuit of existing serial connection fuse; when certain parts damages of communication system cause short circuit; perhaps because human operational error during with the both positive and negative polarity short circuit of DC source; be easy to make the serial connection blown fuse; the fuse that blown fuse needs the machine of tearing open more to renew later on brings very big inconvenience for on-the-spot fitting operation personnel or attendant.Therefore we need more convenient effective short-circuit protection circuit.
The utility model content
The purpose of this utility model is, overcomes the deficiencies in the prior art, proposes a kind of short-circuit protection circuit of DC power supply, after being short-circuited, not only can not damage DC source, and does not need to tear open machine replacing fuse.
The short-circuit protection circuit of the disclosed a kind of DC power supply of the utility model; be serially connected in DC power supply and be powered between the equipment; comprise current sampler, controller and switching tube; electric current in the described current sampler testing circuit is also exported to described controller; described controller is controlled the break-make of described switching tube according to the size of the electric current in the circuit.
The short-circuit protection circuit of the utility model DC power supply also has following subordinate technical characterictic:
Described controller comprises comparison amplifier, output circuit and trigger, the electric current that described current sampler samples compares and enlarges by described comparison amplifier and a reference voltage, voltage after relatively amplifying is controlled described trigger by described output circuit, and the square wave of described trigger output is controlled the ON time and the turn-off time of described switching tube.
Described switching tube is the switch mosfet pipe.；
Short-circuit protection circuit of the present utility model, after being short-circuited, the fuse that does not need the machine of tearing open more to renew, convenient and practical.And short circuit current is little during short circuit, can also reach the effect of current-limiting protection.Safety Design of the present utility model has improved DC source and the security reliability that is powered equipment.
Description of drawings
Fig. 1 is a short-circuit protection circuit block diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further details.
DC source in the course of the work, the electric current of output can change according to the difference of load.When load runs into different abnormal conditions; the electric current that can change; to this current sample; deliver to comparison amplifier and a reference voltage compares and enlarges; voltage after relatively amplifying turn-offs by the square wave control switch mosfet pipe of trigger output; thereby realize short-circuit protection and current-limiting protection, the operation principle of Here it is the utility model short-circuit protection circuit.
The short-circuit protection circuit of DC source comprises current sampler, controller and switch mosfet pipe as shown in Figure 1, and controller comprises comparison amplifier, output circuit and trigger.When DC source is given power devices, under the normal operation, the detected signal voltage of current sampler in the circuit is not enough to compare with the reference voltage of comparison amplifier, this moment, the output of comparison amplifier can not overturn, the output level that is comparison amplifier remains unchanged, therefore the output level of output circuit remains unchanged, and the operating state of trigger, switch mosfet pipe also remains unchanged.When equipment take place unusual, because when fault and short circuit, it is big that current in loop becomes, when current in loop greatly when surpassing the electric current of setting, the detected signal voltage of current sampler in the circuit and the reference voltage of comparison amplifier compare at this moment, because the detected signal voltage of current sampler is greater than the reference voltage of comparison amplifier, at this moment the output level of comparison amplifier changes, the output circuit upset, level after the upset removes to trigger trigger, is gone to control the disconnection of switch mosfet pipe again by the square wave of trigger output.
After having adopted technique scheme, because the effect of trigger, the ON time and the turn-off time of the high-low level working time control switch mosfet pipe of square wave that can be by regulating trigger output.Thereby the short-circuit protection that has solved existing DC source needs the technical problem of the fuse that the machine of tearing open more renews later in blown fuse.In addition, owing to adopted the current sample technology, can also regulate arbitrarily the electric current of sampling, to reach best current limitation effect according to different specification requirements.
In sum, the short-circuit protection circuit of this DC source, after being short-circuited, the fuse that does not need the machine of tearing open more to renew, and also short circuit current is little during short circuit, can also reach the effect of current-limiting protection.Safety Design of the present utility model has improved DC source and the security reliability that is powered equipment, has practicality, has represented the development trend of the short-circuit protection of current DC source.
Claims (3)
1. the short-circuit protection circuit of a DC power supply; be serially connected in DC power supply and be powered between the equipment; it is characterized in that; comprise current sampler, controller and switching tube; electric current in the described current sampler testing circuit is also exported to described controller; described controller is controlled the break-make of described switching tube according to the size of the electric current in the circuit.
2. the short-circuit protection circuit of a kind of DC power supply according to claim 1; it is characterized in that; described controller comprises comparison amplifier, output circuit and trigger; the electric current that described current sampler samples compares and enlarges by described comparison amplifier and a reference voltage; voltage after relatively amplifying is controlled described trigger by described output circuit, and the square wave of described trigger output is controlled the ON time and the turn-off time of described switching tube.
3. the short-circuit protection circuit of a kind of DC power supply according to claim 2 is characterized in that, described switching tube is the switch mosfet pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620014411 CN200941553Y (en) | 2006-08-31 | 2006-08-31 | Short-circuit protective circuit of dc. power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620014411 CN200941553Y (en) | 2006-08-31 | 2006-08-31 | Short-circuit protective circuit of dc. power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200941553Y true CN200941553Y (en) | 2007-08-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620014411 Expired - Lifetime CN200941553Y (en) | 2006-08-31 | 2006-08-31 | Short-circuit protective circuit of dc. power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200941553Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638028A (en) * | 2011-02-15 | 2012-08-15 | 和映科技有限公司 | Battery loop protection module and battery module thereof |
| CN102916387A (en) * | 2012-10-31 | 2013-02-06 | 深圳市虹远通信有限责任公司 | Protection circuit for multi-port POE (power over Ethernet) power supply output shunt |
| CN104167709A (en) * | 2013-05-19 | 2014-11-26 | 黄三元 | Electric vehicle power supply short-circuit protection circuit |
| CN105305368A (en) * | 2015-10-26 | 2016-02-03 | 南京航空航天大学 | Hot wire current limiting protection circuit for hot-wire anemometer |
| CN107887508A (en) * | 2017-07-17 | 2018-04-06 | 中国人民解放军国防科学技术大学 | A kind of RRAM electrical characteristics measurement current-limiting circuit of super fast response |
| CN109087613A (en) * | 2018-10-29 | 2018-12-25 | 惠科股份有限公司 | Current foldback circuit and display drive apparatus |
| TWI692163B (en) * | 2017-01-06 | 2020-04-21 | 盧昭正 | Short circuit protection device for dc power source |
-
2006
- 2006-08-31 CN CN 200620014411 patent/CN200941553Y/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638028A (en) * | 2011-02-15 | 2012-08-15 | 和映科技有限公司 | Battery loop protection module and battery module thereof |
| CN102916387B (en) * | 2012-10-31 | 2016-01-20 | 深圳市虹远通信有限责任公司 | A kind of protective circuit exporting shunt for many mouthfuls of POE chargers |
| CN102916387A (en) * | 2012-10-31 | 2013-02-06 | 深圳市虹远通信有限责任公司 | Protection circuit for multi-port POE (power over Ethernet) power supply output shunt |
| CN104167709B (en) * | 2013-05-19 | 2018-03-20 | 温州卡耐夫电器有限公司 | Electric vehicle power sources short-circuit protection circuit |
| CN104167709A (en) * | 2013-05-19 | 2014-11-26 | 黄三元 | Electric vehicle power supply short-circuit protection circuit |
| CN108206501A (en) * | 2013-05-19 | 2018-06-26 | 杨妮 | Electric vehicle power sources short-circuit protection circuit |
| CN108206501B (en) * | 2013-05-19 | 2019-05-24 | 速珂智能科技（上海）有限公司 | Electric vehicle power sources short-circuit protection circuit |
| CN105305368A (en) * | 2015-10-26 | 2016-02-03 | 南京航空航天大学 | Hot wire current limiting protection circuit for hot-wire anemometer |
| CN105305368B (en) * | 2015-10-26 | 2017-12-08 | 南京航空航天大学 | The hot line current-limiting protection circuit of hot-wire anemometer |
| TWI692163B (en) * | 2017-01-06 | 2020-04-21 | 盧昭正 | Short circuit protection device for dc power source |
| CN107887508A (en) * | 2017-07-17 | 2018-04-06 | 中国人民解放军国防科学技术大学 | A kind of RRAM electrical characteristics measurement current-limiting circuit of super fast response |
| CN109087613A (en) * | 2018-10-29 | 2018-12-25 | 惠科股份有限公司 | Current foldback circuit and display drive apparatus |
| US11688360B2 (en) | 2018-10-29 | 2023-06-27 | HKC Corporation Limited | Overcurrent protection circuit and display drive device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shenzhen Techone Tech. Co., Ltd. Assignor: Gold Power Co., Ltd. Contract record no.: 2010440000242 Denomination of utility model: Short circuit protection circuit of DC power supply Granted publication date: 20070829 License type: Exclusive License Record date: 20100308 |
|
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN GOLD POWER TECH. CO., LTD. Free format text: FORMER NAME: GOLD POWER CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 518040, room 1301, A, Innovation Technology Plaza, Tian An Digital City, Shenzhen, Guangdong, Futian District Patentee after: Shenzhen Gold Power Technology Co., Ltd. Address before: 518040, room 1301, A, Innovation Technology Plaza, Tian An Digital City, Shenzhen, Guangdong, Futian District Patentee before: Gold Power Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20070829 |
|
| EXPY | Termination of patent right or utility model |