CN201160213Y - Recoverable short-circuit protection circuit - Google Patents
Recoverable short-circuit protection circuit Download PDFInfo
- Publication number
- CN201160213Y CN201160213Y CNU2007201774895U CN200720177489U CN201160213Y CN 201160213 Y CN201160213 Y CN 201160213Y CN U2007201774895 U CNU2007201774895 U CN U2007201774895U CN 200720177489 U CN200720177489 U CN 200720177489U CN 201160213 Y CN201160213 Y CN 201160213Y
- Authority
- CN
- China
- Prior art keywords
- electric
- controlled switch
- circuit
- resistance
- short
- 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
Images
Landscapes
- Protection Of Static Devices (AREA)
Abstract
The utility model relates to a recoverable short circuit protection circuit, which comprises a power supply input terminal, a power supply output terminal and a first electric control switch provided with a controlling terminal and two conducting terminals; the two conducting terminals are respectively connected with the power supply input terminal and the power supply output terminal; a second electric control switch is provided with a controlling terminal and two conducting terminals; the two conducting terminals are respectively connected with the power supply input terminal and the controlling terminal of the first electric control switch; a first resistor with both terminals respectively connected with the controlling terminal of the first electric control switch and a grounding terminal; a second resistor with both terminals respectively connected with the controlling terminal of the second electric control switch and the power supply output terminal. Through the structure, the recoverable short circuit protection circuit can have the function of recoverable short circuit protection, in addition, the structure is simple, and the cost is low.
Description
Technical field
The utility model is relevant with electronic circuit, but is meant a kind of return type short-circuit protection circuit especially.
Background technology
Press; in the protection of a Circuits System; in order to prevent system short-circuit; usually can add fuse at power end, but the not reproducible use of fuse must be changed because just blown; therefore be necessary to propose a kind of framework; can be when system short-circuit protection system, and after short-circuit state is got rid of, can reply again and can power again, and recover normal operation.
United States Patent (USP) US5; 724, No. 218 patents have proposed a kind of circuit of short-circuit protection; it mainly is made up of a vague and general type N-MOS, an enhancement mode N-MOS, a resistance, a hot variable resistor and a current detecting module, and the circuit of this kind framework can provide the short-circuit protection effect.Yet it mainly is to utilize this current detecting module to come detecting current, to record whether short circuit is arranged at present, the relevant action of execute protection again, and the assembly of this kind circuit is more, and cost is higher.
The utility model content
But the purpose of this utility model is to provide a kind of return type short-circuit protection circuit, to overcome the defective that exists in the known technology.
For achieving the above object, but the return type short-circuit protection circuit that the utility model provides, and it includes:
One power input;
One power output end;
One first electric-controlled switch has a control end and two conduction terminal, and this two conduction terminal is connected to this power input and this power output end;
One second electric-controlled switch has a control end and two conduction terminal, and this two conduction terminal is connected to the control end of this power input and this first electric-controlled switch;
One first resistance, two ends are connected to the control end and an earth terminal of this first electric-controlled switch; And
One second resistance, two ends are connected to control end and this power output end of this second electric-controlled switch.
But described return type short-circuit protection circuit, wherein the resistance value of this second resistance is greater than the resistance value of this first resistance.
But described return type short-circuit protection circuit, wherein this first electric-controlled switch and this second electric-controlled switch are the semiconductor switch.
But described return type short-circuit protection circuit; wherein this first electric-controlled switch and this second electric-controlled switch are a mos field effect transistor (PMOS (P passage MOSFET)), and this first electric-controlled switch and this second electric-controlled switch are connected in this power input with its source electrode.
As from the foregoing, effect of the present utility model is:
One, reach the short-circuit protection effect, but and recovery function: can cut off the electricity supply at once when the utility model externally installs short circuit reaches the effect of short-circuit protection, and can be returned to normal condition work once again after short circuit is got rid of.
Two, circuit structure is simple, and is with low cost: the utility model only sees through two electric-controlled switch PMOS, and two resistance can reach recoverable short-circuit protection function, and more simple than known techniques, cost is also more cheap.
Description of drawings
Fig. 1 is the circuit structure diagram of the utility model one preferred embodiment.
Primary clustering symbol description in the accompanying drawing:
But 10 return type short-circuit protection circuits
11 power inputs
15 power output ends
The GND earth terminal
The G control end
S conduction terminal (source electrode)
D conduction terminal (drain electrode)
Q1 first electric-controlled switch
Q2 second electric-controlled switch
R1 first resistance
R2 second resistance
Embodiment
But the return type short-circuit protection circuit that the utility model provides includes: a power input; One power output end; One first electric-controlled switch has a control end and two conduction terminal, and this two conduction terminal is connected to this power input and this power output end; One second electric-controlled switch has a control end and two conduction terminal, and this two conduction terminal is connected to the control end of this power input and this first electric-controlled switch; One first resistance, two ends are connected to the control end and an earth terminal of this first electric-controlled switch; And one second resistance, two ends are connected to control end and this power output end of this second electric-controlled switch.Thus, can have recoverable short-circuit protection effect, and have advantage simple in structure, with low cost.
In order to describe structure of the present utility model and characteristics place in detail, lift with next preferred embodiment and conjunction with figs. explanation as after, wherein:
As shown in Figure 1; but a kind of return type short-circuit protection circuit 10 that the utility model one preferred embodiment is provided; mainly formed by a power input 11, a power output end 15, one first electric-controlled switch Q1, one second electric-controlled switch Q2, one first resistance R 1 and one second resistance R 2, wherein:
This first electric-controlled switch Q1 is the semiconductor switch, is a PMOS (P passage MOSFET) in present embodiment, have a control end G (grid) and two conduction terminal S, D (source electrode, drain electrode), this two conduction terminal S, D is connected to this power input 11 and this power output end 15.
This second electric-controlled switch Q2 is the semiconductor switch, is a PMOS (P passage MOSFET) in present embodiment, have a control end G and two conduction terminal S, D, this two conduction terminal S, D are connected to the control end G of this power input 11 and this first electric-controlled switch Q1.
This first resistance R 1, two ends are connected to a control end G and the earth terminal GND of this first electric-controlled switch Q1.
This second resistance R 2, two ends are connected to control end G and this power output end 15 of this second electric-controlled switch Q2.
Wherein, the resistance value of this second resistance R 2 is greater than the resistance value of this first resistance R 1.
Working method of the present utility model below is described:
The utility model is to be connected in the external power source (not shown) with this power input 11, and is connected in an external device (ED) (not shown) with this power output end 15.
When this external device (ED) operate as normal, this external power source is to these power input 11 power supplies, by the resistance value of this second resistance R 2 resistance value greater than this first resistance R 1, its charge constant R2Cg is greater than R1Cg (wherein Cg is a grid capacitance), so Vsg＞Vth of this first electric-controlled switch Q1, can be than the conducting of this second electric-controlled switch Q2 elder generation, this moment, this external power source was by these power output end 15 power supplies via the utility model.And the not conducting of Vsg＜Vth of this second electric-controlled switch Q2 at this moment.
When this external device (ED) short circuit, the voltage of this power output end 15 is 0, Vsg＞Vth of this second electric-controlled switch Q2, so this second electric-controlled switch Q2 conducting at this moment.Simultaneously, the control end G voltage of this first electric-controlled switch Q1 promptly approximates the voltage of this external power source, and makes Vsg＜Vth of this first electric-controlled switch Q1 so this i.e. not conducting of first electric-controlled switch Q1, therefore cut off the supply of external power source, this power output end 15 is a no-output.Can reach the effect of protection short circuit thus.
And after the short-circuit state of this external device (ED) is got rid of,, can make this first electric-controlled switch Q1 conducting once again as long as again with this external power source, and be returned to the state of power supply again.
Claims (4)
1, but a kind of return type short-circuit protection circuit is characterized in that, includes:
One power input;
One power output end;
One first electric-controlled switch has a control end and two conduction terminal, and this two conduction terminal is connected to this power input and this power output end;
One second electric-controlled switch has a control end and two conduction terminal, and this two conduction terminal is connected to the control end of this power input and this first electric-controlled switch;
One first resistance, two ends are connected to the control end and an earth terminal of this first electric-controlled switch; And
One second resistance, two ends are connected to control end and this power output end of this second electric-controlled switch.
2, but return type short-circuit protection circuit as claimed in claim 1 is characterized in that, wherein the resistance value of this second resistance is greater than the resistance value of this first resistance.
3, but return type short-circuit protection circuit as claimed in claim 1 is characterized in that, wherein this first electric-controlled switch and this second electric-controlled switch are the semiconductor switch.
But 4, return type short-circuit protection circuit as claimed in claim 3; it is characterized in that; wherein this first electric-controlled switch and this second electric-controlled switch are a mos field effect transistor, and this first electric-controlled switch and this second electric-controlled switch are connected in this power input with its source electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201774895U CN201160213Y (en) | 2007-12-18 | 2007-12-18 | Recoverable short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201774895U CN201160213Y (en) | 2007-12-18 | 2007-12-18 | Recoverable short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201160213Y true CN201160213Y (en) | 2008-12-03 |
Family
ID=40110795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201774895U Expired - Fee Related CN201160213Y (en) | 2007-12-18 | 2007-12-18 | Recoverable short-circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201160213Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136181A (en) * | 2010-01-25 | 2011-07-27 | 能美防灾株式会社 | Short-circuit isolator |
| CN107908217A (en) * | 2017-11-15 | 2018-04-13 | 绵阳双甘科技有限公司 | A kind of game machine of use power supply for ending protection |
-
2007
- 2007-12-18 CN CNU2007201774895U patent/CN201160213Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136181A (en) * | 2010-01-25 | 2011-07-27 | 能美防灾株式会社 | Short-circuit isolator |
| CN102136181B (en) * | 2010-01-25 | 2013-12-04 | 能美防灾株式会社 | Short-circuit isolator |
| CN107908217A (en) * | 2017-11-15 | 2018-04-13 | 绵阳双甘科技有限公司 | A kind of game machine of use power supply for ending protection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101252309B (en) | Direct-current power supply slow startup control circuit | |
| CN202083915U (en) | Button switch control circuit with zero standby power consumption | |
| CN201383668Y (en) | Over-current protection circuit and motor controller applied to same | |
| CN103941597B (en) | Power control circuit and there is the electronic installation of this power control circuit | |
| CN101599487B (en) | Electrostatic discharge testing circuit and correlated method thereof | |
| CN101815378B (en) | LED constant current source output short circuit protection circuit | |
| CN110729964B (en) | Photovoltaic system and photovoltaic module thereof | |
| CN102047560A (en) | Output driver with overvoltage protection | |
| CN103260314A (en) | Short circuit protection circuit and electronic device with same | |
| CN101212147B (en) | Power voltage supply circuit | |
| CN201260063Y (en) | Over-voltage protection circuit based on single power supply voltage and electric appliance device having the circuit | |
| CN201160213Y (en) | Recoverable short-circuit protection circuit | |
| CN102612209B (en) | Recoverable protective circuit of boosting LED (light emitting diode) driving power supply and design method of recoverable protective circuit | |
| CN103376748A (en) | Electronic device | |
| CN206099293U (en) | High voltage input protection circuit | |
| CN202210788U (en) | Electronic type touch switch | |
| CN201025484Y (en) | Testing device for voltage sudden wave | |
| CN205015670U (en) | Dual power supply and outage time schedule control device | |
| CN103078597B (en) | A kind of biasing circuit | |
| CN101650589B (en) | Power-switching circuit | |
| CN103164008A (en) | Complementary metal oxide semiconductor (CMOS) password eliminating circuit | |
| CN209514542U (en) | A kind of reset circuit | |
| CN205921529U (en) | Protection circuit and electronic product | |
| CN102394623A (en) | Electronic-type touch switch | |
| CN105703762B (en) | Voltage sequence output circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: HUANXU ELECTRONICS CO., LTD. Free format text: FORMER OWNER: UNIVERSAL SCIENTIFIC INDUSTRIES CO., LTD Effective date: 20100712 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: NANTOU COUNTY, TAIWAN PROVINCE, CHINA TO: 201203 NO.1558, ZHANGDONG ROAD, INTEGRATED CIRCUIT INDUSTRY ZONE HANGJIANG HIGH-TECH PARK, SHANGHAI CITY |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20100712 Address after: Zhangjiang hi tech park integrated circuit industry Zhang Road 201203 Shanghai City No. 1558 Patentee after: Huanxu Electronics Co., Ltd. Address before: Taiwan Nantou County Chinese Patentee before: Huanlong Electric Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081203 Termination date: 20121218 |