CN105337267A - Short circuit protection system - Google Patents
Short circuit protection system Download PDFInfo
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- CN105337267A CN105337267A CN201410309057.XA CN201410309057A CN105337267A CN 105337267 A CN105337267 A CN 105337267A CN 201410309057 A CN201410309057 A CN 201410309057A CN 105337267 A CN105337267 A CN 105337267A
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- switching branches
- short circuit
- branch road
- protection system
- circuit protection
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Abstract
The invention belongs to the electronic communication technical field and relates to a short circuit protection system used for an electricity utilization system, wherein the electricity utilization system includes a direct-current power source and electricity utilization equipment, wherein the electricity utilization equipment includes a power source input end and a grounding end. The short circuit protection system comprises the following components of: a first switch branch circuit which is controllably connected in series between the direct-current power source and the power source input end, and is switched on under first control signals so as to realize normal power supply, and is switched off under second control signals so as to protect electricity utilization equipment; a second switch branch circuit which is controllably connected between the grounding end and the control end of the first switch branch circuit, and generates the first controls signals when being switched on, and is switched off when the electricity utilization equipment is short circuited; a current limiting branch circuit which generates third control signals and decreases the current of the electricity utilization system when the first switch branch circuit is switched off so as to protect the electricity utilization equipment. The short circuit protection system of the invention has the advantages of easiness in implementation, safety and reliability. With the short circuit protection system adopted, when short-circuit faults are eliminated, power supply can be recovered automatically without manual intervention required; and self protection of the electricity utilization system in short-circuit faults can be realized.
Description
Technical field
The present invention relates to technical field of electronic communication, be specifically related to a kind of short circuit protection system.
Background technology
Present consumer electronics product, as mobile phone, MP3, camera etc., often uses battery or DC power supply.But the battery quality on market is uneven; often the report that some battery explosions are hurted sb.'s feelings is had; this type of event major part is because short circuit appears in power consumption equipment, and the battery used or charge power supply do not provide the function of qualified short-circuit protection, thus causes battery accident.More serious, even can cause great fire.Existing short circuit protection system or too complicated, reliability is low, or cost is high, or cannot automatic recovery of power supply when short trouble is got rid of, and all has certain limitation.
Summary of the invention
The object of the invention is to, provide a kind of high reliability, the solution of low cost: a kind of short circuit protection system, solve above technical problem.
Technical problem solved by the invention can realize by the following technical solutions:
A kind of short circuit protection system, for using electricity system, described using electricity system comprises DC power supply and power consumption equipment, and described power consumption equipment comprises power input and earth terminal, it is characterized in that, described short circuit protection system comprises,
One first switching branches, controllably be series between described DC power supply and described power input, described first switching branches under one first control signal conducting to disconnect protecting described power consumption equipment to described power consumption equipment normal power supply and under one second control signal;
One second switch branch road, between the control end being controllably connected to described earth terminal and described first switching branches, the control end of described second switch branch road connects described power input, for under one the 3rd control signal effect, conducting is to produce described first control signal, described second switch branch road disconnects when described power consumption equipment short circuit;
One current limliting branch road, is parallel to the two ends of described first switching branches, to produce described 3rd control signal, and reduces the electric current of using electricity system to protect described power consumption equipment when described first switching branches disconnects.
Preferably, described current limliting branch road comprises the first current-limiting resistance and the second current-limiting resistance, described first current-limiting resistance and described second current-limiting resistance parallel connection.
Preferably, comprise one first resistance, be connected between the input of described first switching branches and the control end of described first switching branches, in order to provide described second control signal when described second switch branch road disconnects.
Preferably, described first switching branches is formed primarily of a P channel MOS tube, the grid of described P channel MOS tube is as the control end of described first switching branches, the source electrode of described P channel MOS tube is as the input of described first switching branches, and the drain electrode of described P channel MOS tube is connected with described power input as the output of described first switching branches.
Preferably, described second switch branch road is formed primarily of a N-channel MOS pipe, the grid of described N-channel MOS pipe is as the control end of described second switch branch road, the source electrode of described N-channel MOS pipe connects described earth terminal, and the drain electrode of described N-channel MOS pipe connects the control end of described first switching branches.
Preferably, described first switching branches is formed primarily of a PNP triode, the base stage of described PNP triode is as the control end of described first switching branches, the emitter of described PNP triode is as the input of described first switching branches, and the collector electrode of described PNP triode is connected with described power input as the output of described first switching branches.
Preferably, described second switch branch road is formed primarily of a NPN triode, the base stage of described NPN triode is as the control end of described second switch branch road, the emitter of described NPN triode connects described earth terminal, and the collector electrode of described NPN triode connects the control end of described first switching branches.
Preferably, also comprise discharge paths, between the control end being connected to described second switch branch road and described earth terminal, one second resistance that described discharge paths is connected.
Preferably, described power consumption equipment is mobile phone, PDA or panel computer.
Beneficial effect: owing to adopting above technical scheme, the present invention
1) can hardware circuit be relied on completely realize, realize easy, safe and reliable, simultaneously with low cost.
2) can automatic recovery of power supply when short trouble is eliminated, without the need to manual intervention;
3) equipment that any use battery or direct current make power supply can be applied to, include but not limited to mobile phone, PDA, the products such as panel computer, realize self-protection when short circuit appears in using electricity system.
Accompanying drawing explanation
Fig. 1 is a kind of system architecture schematic diagram of the present invention;
Fig. 2 is analogue system schematic diagram of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of protection of the invention.
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
With reference to Fig. 1, a kind of short circuit protection system, for using electricity system, using electricity system comprises DC power supply 11 and power consumption equipment 12, and power consumption equipment 12 comprises power input and earth terminal GND, and wherein, short circuit protection system comprises,
One first switching branches, is controllably series between DC power supply and power input, the first switching branches under one first control signal conducting to disconnect protecting power consumption equipment 12 to power consumption equipment 12 normal power supply and under one second control signal;
One second switch branch road, between the control end being controllably connected to earth terminal GND and the first switching branches, the control end of second switch branch road connects power input, for under one the 3rd control signal effect, conducting is to produce the first control signal, second switch branch road disconnects when power consumption equipment 12 short circuit;
One first resistance R1, is connected between the input of the first switching branches and the control end of the first switching branches, in order to provide the second control signal when second switch branch road disconnects;
One current limliting branch road, is parallel to the two ends of the first switching branches, to produce the 3rd control signal, and reduces the electric current of using electricity system to protect power consumption equipment 12 when the first switching branches disconnection.
The present invention is when DC power supply 11 powers on, if power consumption equipment is normal, there is no short circuit, DC power supply 11 provides high level signal as the 3rd control signal by the control end that current limliting branch road is second switch branch road, make the conducting of second switch branch road, the control end that second switch branch road is the first switching branches provides low level control signal as the first control signal, the first switching branches conducting, and power consumption equipment 12 obtains electric; And if power consumption equipment 12 short circuit, the control end of second switch branch road is then low level, second switch branch road disconnects, DC power supply 11 provides a high-level control signal as the second control signal by the control end that the first resistance R1 is the first switching branches, and the first switching branches is disconnected, and DC power supply 11 is powered by current limliting Zhi Luxiang power consumption equipment 12, in system, electric current obtains restriction, when short trouble is eliminated, system is recovered automatically, by the first switching branches normal power supply.
As a kind of preferred embodiment of the present invention, current limliting branch road can comprise the first current-limiting resistance R2 and the second current-limiting resistance R3, and the first current-limiting resistance R2 and the second current-limiting resistance R3 is in parallel.
As a kind of preferred embodiment of the present invention, first switching branches is formed primarily of a P channel MOS tube P1, the grid of P channel MOS tube P1 is as the control end of the first switching branches, the source electrode of P channel MOS tube P1 is as the input of the first switching branches, and the drain electrode of P channel MOS tube P1 is as the output of the first switching branches.
As a kind of preferred embodiment of the present invention, second switch branch road is formed primarily of a N-channel MOS pipe N1, the grid of N-channel MOS pipe N1 is as the control end of second switch branch road, the source electrode of N-channel MOS pipe N1 connects earth terminal, and the drain electrode of N-channel MOS pipe N1 connects the control end of the first switching branches.
In specific works, when power supply electrifying, DC power supply 11 is by the first current-limiting resistance R2, second current-limiting resistance R3 provides high level for the grid of N-channel MOS pipe N1, N-channel MOS pipe N1 conducting, for the grid of P channel MOS tube P1 provides low level, P channel MOS tube P1 conducting, DC power supply 11 is powered to power consumption equipment 12 by the first switching branches; If power consumption equipment short circuit, the grid of N-channel MOS pipe N1 is low level, N-channel MOS pipe N1 disconnects, now DC power supply 11 by the first resistance R1 for the grid of P channel MOS tube P1 provides high level, P channel MOS tube P1 is ended, DC power supply 11 is powered to power consumption equipment by the first current-limiting resistance R2 and the second current-limiting resistance R3, and in using electricity system, electric current obtains restriction, realizes the protection to DC power supply 11; And when short trouble is eliminated, system is recovered automatically, by P channel MOS tube P1 normal power supply.Power consumption equipment 12 also provides electric discharge approach for N-channel MOS pipe N1.
As a kind of preferred embodiment of the present invention, in order to reduce costs further, a PNP triode can be adopted to replace P channel MOS tube P1, the base stage of PNP triode is as the control end of the first switching branches, the emitter of PNP triode is as the input of the first switching branches, and the collector electrode of PNP triode is as the output of the first switching branches.
As a kind of preferred embodiment of the present invention, a NPN triode can also be adopted to replace N-channel MOS pipe N1 to reduce costs further, be series on second switch branch road, the base stage of NPN triode is as the control end of second switch branch road, the emitter of NPN triode connects earth terminal, and the collector electrode of NPN triode connects the control end of the first switching branches.
As a kind of preferred embodiment of the present invention, can also comprise discharge paths, between the control end being connected to second switch branch road and earth terminal, discharge paths is connected one second resistance R4.Second resistance provides an electric discharge approach for second switch branch road.
As a kind of preferred embodiment of the present invention, power consumption equipment 12 can be but be not limited to mobile phone, PDA or panel computer.
The present invention can be emulated by the analogue system shown in Fig. 2: adopt the power supply V1 of a 5V to replace DC power supply in Fig. 2, power consumption equipment is replaced with the resistance R5 that resistance is 100 ohm, power supply V1 is connected with the first switching branches by button S1, first switching branches is connected enhancement mode P channel MOS tube Q1, enhancement mode that second switch branch road is connected N-channel MOS pipe Q2, button S2 is parallel to the two ends of resistance R5, when button S2 disconnects, simulation power consumption equipment is normal, when button S2 closes, the short circuit of simulation power consumption equipment, one universal instrument is series between the first switching branches and resistance R5, in order to measure the curent change of using electricity system, the two ends of resistance R5 connect oscillographic two terminals respectively.The selection of each resistance can adjust according to client's actual needs.
Emulate using electricity system power up by closed button S1, observed obtaining by oscilloscope, system can be opened in the time of 407ns, and power consumption equipment obtains electric, and when universal instrument instruction result display power consumption equipment normally works, in system, electric current is 49.824mA.And when button S2 closes, when namely simulating power consumption equipment short circuit, under the effect of short circuit protection system, system works electric current is about 33.33mA.As can be seen from result, when power consumption equipment short circuit, the present invention can make protection to DC power supply well.Can be used for the equipment that all use battery (comprising storage battery) or use DC power supply; include but not limited to mobile phone; PDA; the products such as panel computer; no matter power consumption equipment controls with or without MCU, automatic recovery of power supply when protection when all can adopt the present invention to realize short circuit and short trouble are eliminated.
The foregoing is only preferred embodiment of the present invention; not thereby embodiments of the present invention and protection range is limited; to those skilled in the art; should recognize and all should be included in the scheme that equivalent replacement done by all utilizations specification of the present invention and diagramatic content and apparent change obtain in protection scope of the present invention.
Claims (9)
1. a short circuit protection system, for using electricity system, described using electricity system comprises DC power supply and power consumption equipment, and described power consumption equipment comprises power input and earth terminal, it is characterized in that, described short circuit protection system comprises,
One first switching branches, is controllably series between described DC power supply and described power input, and under one first control signal, conducting is to disconnect protecting described power consumption equipment to described power consumption equipment normal power supply and under one second control signal;
One second switch branch road, between the control end being controllably connected to described earth terminal and described first switching branches, the control end of described second switch branch road connects described power input, for under one the 3rd control signal effect, conducting is to produce described first control signal, described second switch branch road disconnects when described power consumption equipment short circuit;
One current limliting branch road, is parallel to the two ends of described first switching branches, to produce described 3rd control signal, and reduces the electric current of using electricity system to protect described power consumption equipment when described first switching branches disconnects.
2. a kind of short circuit protection system according to claim 1, is characterized in that, described current limliting branch road comprises the first current-limiting resistance and the second current-limiting resistance, described first current-limiting resistance and described second current-limiting resistance parallel connection.
3. a kind of short circuit protection system according to claim 1; it is characterized in that; comprise one first resistance, be connected between the input of described first switching branches and the control end of described first switching branches, in order to provide described second control signal when described second switch branch road disconnects.
4. a kind of short circuit protection system according to claim 1; it is characterized in that; described first switching branches is formed primarily of a P channel MOS tube; the grid of described P channel MOS tube is as the control end of described first switching branches; the source electrode of described P channel MOS tube is as the input of described first switching branches, and the drain electrode of described P channel MOS tube is connected with described power input as the output of described first switching branches.
5. a kind of short circuit protection system according to claim 1; it is characterized in that; described second switch branch road is formed primarily of a N-channel MOS pipe; the grid of described N-channel MOS pipe is as the control end of described second switch branch road; the source electrode of described N-channel MOS pipe connects described earth terminal, and the drain electrode of described N-channel MOS pipe connects the control end of described first switching branches.
6. a kind of short circuit protection system according to claim 1; it is characterized in that; described first switching branches is formed primarily of a PNP triode; the base stage of described PNP triode is as the control end of described first switching branches; the emitter of described PNP triode is as the input of described first switching branches, and the collector electrode of described PNP triode is connected with described power input as the output of described first switching branches.
7. a kind of short circuit protection system according to claim 1; it is characterized in that; described second switch branch road is formed primarily of a NPN triode; the base stage of described NPN triode is as the control end of described second switch branch road; the emitter of described NPN triode connects described earth terminal, and the collector electrode of described NPN triode connects the control end of described first switching branches.
8. a kind of short circuit protection system according to claim 1, is characterized in that, also comprise discharge paths, between the control end being connected to described second switch branch road and described earth terminal, and one second resistance that described discharge paths is connected.
9. a kind of short circuit protection system according to claim 1, is characterized in that, described power consumption equipment is mobile phone, PDA or panel computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410309057.XA CN105337267A (en) | 2014-06-30 | 2014-06-30 | Short circuit protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410309057.XA CN105337267A (en) | 2014-06-30 | 2014-06-30 | Short circuit protection system |
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| Publication Number | Publication Date |
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| CN105337267A true CN105337267A (en) | 2016-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410309057.XA Pending CN105337267A (en) | 2014-06-30 | 2014-06-30 | Short circuit protection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112531650A (en) * | 2020-12-07 | 2021-03-19 | 华羿微电子股份有限公司 | From power MOSFET who takes short-circuit protection |
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|---|---|---|---|---|
| CN2074509U (en) * | 1990-08-11 | 1991-04-03 | 肖公亮 | Safety accumulator |
| JPH0670457A (en) * | 1992-08-17 | 1994-03-11 | Mitsubishi Electric Corp | Current-limiting circuit |
| CN202159967U (en) * | 2011-08-11 | 2012-03-07 | 四川九洲光电科技股份有限公司 | Switch power supply short-circuit protection circuit |
| CN203056557U (en) * | 2013-01-11 | 2013-07-10 | 泉州市桑川电气设备有限公司 | Frequency converter auxiliary power supply overcurrent protection circuit |
-
2014
- 2014-06-30 CN CN201410309057.XA patent/CN105337267A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2074509U (en) * | 1990-08-11 | 1991-04-03 | 肖公亮 | Safety accumulator |
| JPH0670457A (en) * | 1992-08-17 | 1994-03-11 | Mitsubishi Electric Corp | Current-limiting circuit |
| CN202159967U (en) * | 2011-08-11 | 2012-03-07 | 四川九洲光电科技股份有限公司 | Switch power supply short-circuit protection circuit |
| CN203056557U (en) * | 2013-01-11 | 2013-07-10 | 泉州市桑川电气设备有限公司 | Frequency converter auxiliary power supply overcurrent protection circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112531650A (en) * | 2020-12-07 | 2021-03-19 | 华羿微电子股份有限公司 | From power MOSFET who takes short-circuit protection |
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Application publication date: 20160217 |