CN103972858A - Overcurrent protection device - Google Patents
Overcurrent protection device Download PDFInfo
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- CN103972858A CN103972858A CN201310036881.8A CN201310036881A CN103972858A CN 103972858 A CN103972858 A CN 103972858A CN 201310036881 A CN201310036881 A CN 201310036881A CN 103972858 A CN103972858 A CN 103972858A
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- overcurrent protection
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Abstract
The invention provides an overcurrent protection device which is connected between a power input end and a load end. The overcurrent protection device comprises a switch module, an overcurrent control module and an overvoltage control module. The switch module comprises a first end, a control end and a second end, wherein the second end is connected with the load end. When the control end is input with a switch-on control signal, the first end and the second end are switched on. When the control end is input with a switch-off control signal, the first end and the second end are switched off. The overcurrent control module is connected between the power input end and the first end. When current of the load end exceeds a preset value, the overcurrent control module is in an off state. The overvoltage control module is connected with the power input, the first end, and the control end. The overvoltage control module outputs the switch-on control signal or the switch-off control signal to the control end according to voltage signals of the power input end and the first end. The switching module in the device can completely cut off a power supply path of the load end, and accordingly energy waste can be avoided.
Description
[technical field]
The present invention relates to a kind of overcurrent protection device, particularly a kind of overcurrent protection device that can cut off supply path completely.
[background technology]
As shown in Figure 1, existing overcurrent protection device is connected between power input 100 and load end 101, load end 101 accesses load 103 and power input 100 and switches on power after 104, power supply 104, R1, R2 and load 103 form loop, there is small electric current through R1, R2 and load 103, by current sensor 105 for detecting the size of current of load 103, when the electric current that detects load 103 when current sensor 105 is normal range (NR), control switch 106 closures, R2 short circuit, power input 100 is to load 103 normal power supplies; And when current sensor 105 detects, the electric current of load 103 is excessive or when too small, control switch 106 disconnects, still; still have small electric current through R1, the R2 load 103 of flowing through; therefore, existing overcurrent protection device can not cut off supply path completely, causes energy waste.
[summary of the invention]
Main purpose of the present invention is to provide a kind of overcurrent protection device that can cut off supply path completely.
The invention provides a kind of overcurrent protection device, it is connected between power input and load end; And described overcurrent protection device comprises switch module, excess current control module and excess voltage control module, described switch module comprises first end, control end and the second end, and described the second end connects load end, in the time that control signal is opened in control end input, first end and the second end conducting; And in the time that control signal is closed in control end input, first end and the second end disconnect; Described excess current control module is connected between power input and first end, and in the time that the electric current of load end exceeds set point, excess current control module is in off state; Described excess voltage control module connects power input, first end, control end, and excess voltage control module opens control signal according to the voltage signal output of power input and first end or pass controls signal to control end.
Especially, described switch module comprises NMOS element and PMOS element, very first end of the S of PMOS element, and the D of PMOS element is the second end very, very control end of the G of NMOS element, the S utmost point ground connection of NMOS element, the D utmost point of NMOS element connects the G utmost point of PMOS element.
Especially, described excess current control module is for can reply fuse.
Especially, described excess voltage control module comprises detecting chip and D type flip-flop, detecting chip connects power input and exports detection signal to D type flip-flop according to the signal of telecommunication of power input, D type flip-flop opens control signal according to the signal of telecommunication output of detection signal and first end or pass controls signal to control end, when the signal of telecommunication normal when the signal of telecommunication of power input and first end is normal, opening control signal is low level signal;
And in the time that the signal of telecommunication signal of telecommunication undesired or first end of power input is undesired, opening control signal is high level signal.
Especially, between the G utmost point of described PMOS element and the S utmost point of described PMOS element, be connected diac.
Especially, described overcurrent protection device is located in charger.
Compared with prior art, in the present invention, switch module can cut off the supply path of load end completely, avoids energy waste.
[brief description of the drawings]
Fig. 1 is the circuit block diagram of existing overcurrent protection device.
Fig. 2 is the circuit block diagram of overcurrent protection device of the present invention.
[embodiment]
Refer to shown in Fig. 2, the invention provides a kind of overcurrent protection device, it is connected between power input 200 and load end 201; Load end 201 accesses load 203 and power input 200 switches on power 204; In the present embodiment, described overcurrent protection device is located in charger.Described overcurrent protection device comprises switch module 30, excess current control module 40 and excess voltage control module 50, described switch module 30 comprises first end 31, control end 32 and the second end 33, and described the second end 33 connects load end 201, in the time that control signal is opened in control end 32 inputs, first end 31 and the second end 33 conductings; And in the time that control signal is closed in control end 32 inputs, first end 31 and the second end 33 disconnect; Described excess current control module 40 is connected between power input 200 and first end 31, and in the time that the electric current of load end 201 exceeds set point, excess current control module 40 is in off state; In the present embodiment, described excess current control module 40 is for can reply fuse.Described excess voltage control module 50 connects power input 200, first end 31, control end 32, and excess voltage control module 50 opens control signal according to power input 200 and the voltage signal output of first end 31 or pass controls signal to control end 32.In the present embodiment, described switch module 30 comprises NMOS element 34 and PMOS element 35, very first end of the S of PMOS element 35, the D of PMOS element 35 is the second end very, very control end of the G of NMOS element 34, the S utmost point ground connection of NMOS element 34, the D utmost point of NMOS element 34 connects the G utmost point of PMOS element 35.And be connected diac 36 and resistance 37 between the G utmost point of described PMOS element 35 and the S utmost point of described PMOS element 35.Described excess voltage control module 50 comprises detecting chip 51 and D type flip-flop 52, detecting chip 51 connects power input 200 and exports detection signal to D type flip-flop 52 according to the signal of telecommunication of power input 200, and D type flip-flop 52 opens control signal according to the signal of telecommunication output of detection signal and first end 31 or pass controls signal to control end 32.
If the electric current of load end 201 does not exceed set point, excess current control module 40 is in channel status; Simultaneously, the voltage signal voltage signal normal and first end 31 of power input 200 is normal, opening control signal is low level signal, 34 conductings of NMOS element, 35 conductings of PMOS element, that is, and conducting between first end 31 and the second end 33, between power supply 204 and load 203, form loop, power supply 204 is load 203 normal power supplies.
If the electric current of load end 201 exceeds set point, excess current control module 40, in off state, does not form loop between power supply 204 and load 203, and power supply 204 can not powered for load 203.
If the electric current of load end 201 does not exceed set point, excess current control module 40 is in channel status; But; the voltage signal voltage signal undesired or first end 31 of power input 200 is undesired; opening control signal is high level signal; NMOS element 34 ends; PMOS element 35 ends, that is, between first end 31 and the second end 33, disconnect; between power supply 204 and load 203, do not form loop, power supply 204 can not powered for load 203.
In sum, when first end 31 curtage signal when all voltage signal normal and power input 200 is normal, between power supply 204 and load 203, form loop; In all the other situations, utilize switch module 30 and excess current control module 40 to cut off the supply path of load end 201 completely, avoid energy waste.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (6)
1. an overcurrent protection device, it is connected between power input and load end; It is characterized in that described overcurrent protection device comprises:
Switch module, it comprises first end, control end and the second end, and described the second end connection load end,
In the time that control signal is opened in control end input, first end and the second end conducting; And in the time that control signal is closed in control end input, first end and the second end disconnect;
Excess current control module, it is connected between power input and first end, and in the time that the electric current of load end exceeds set point, excess current control module is in off state;
Excess voltage control module, it connects power input, first end, control end, and excess voltage control module opens control signal according to the voltage signal output of power input and first end or pass controls signal to control end.
2. overcurrent protection device according to claim 1; it is characterized in that: described switch module comprises NMOS element and PMOS element; very first end of the S of PMOS element; the D of PMOS element is the second end very; very control end of the G of NMOS element; the S utmost point ground connection of NMOS element, the D utmost point of NMOS element connects the G utmost point of PMOS element.
3. overcurrent protection device according to claim 2, is characterized in that: described excess current control module is for can reply fuse.
4. overcurrent protection device according to claim 3, it is characterized in that: described excess voltage control module comprises detecting chip and D type flip-flop, detecting chip connects power input and exports detection signal to D type flip-flop according to the signal of telecommunication of power input, D type flip-flop opens control signal according to the signal of telecommunication output of detection signal and first end or pass controls signal to control end, when the signal of telecommunication normal when the signal of telecommunication of power input and first end is normal, opening control signal is low level signal; And in the time that the signal of telecommunication signal of telecommunication undesired or first end of power input is undesired, opening control signal is high level signal.
5. overcurrent protection device according to claim 4, is characterized in that: between the G utmost point of described PMOS element and the S utmost point of described PMOS element, be connected diac.
6. overcurrent protection device according to claim 5, is characterized in that: described overcurrent protection device is located in charger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310036881.8A CN103972858A (en) | 2013-01-30 | 2013-01-30 | Overcurrent protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310036881.8A CN103972858A (en) | 2013-01-30 | 2013-01-30 | Overcurrent protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103972858A true CN103972858A (en) | 2014-08-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310036881.8A Pending CN103972858A (en) | 2013-01-30 | 2013-01-30 | Overcurrent protection device |
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| CN (1) | CN103972858A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110481324A (en) * | 2019-07-15 | 2019-11-22 | 新乡市光明电器有限公司 | Load control circuit, load control mould group and electric control box |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH104624A (en) * | 1996-06-13 | 1998-01-06 | Nec Gumma Ltd | Overvoltage protective circuit and electronic circuit furnished therewith |
| CN1869875A (en) * | 2005-05-27 | 2006-11-29 | 佛山市顺德区顺达电脑厂有限公司 | User operation blocking device and method |
| CN202034757U (en) * | 2011-04-27 | 2011-11-09 | 北京立华莱康平台科技有限公司 | Protective circuit |
| CN102565514A (en) * | 2010-12-14 | 2012-07-11 | 鸿富锦精密工业（深圳）有限公司 | Voltage drop detecting circuit |
| CN203180485U (en) * | 2013-01-30 | 2013-09-04 | 昆达电脑科技(昆山)有限公司 | Overcurrent protection device |
-
2013
- 2013-01-30 CN CN201310036881.8A patent/CN103972858A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH104624A (en) * | 1996-06-13 | 1998-01-06 | Nec Gumma Ltd | Overvoltage protective circuit and electronic circuit furnished therewith |
| CN1869875A (en) * | 2005-05-27 | 2006-11-29 | 佛山市顺德区顺达电脑厂有限公司 | User operation blocking device and method |
| CN102565514A (en) * | 2010-12-14 | 2012-07-11 | 鸿富锦精密工业（深圳）有限公司 | Voltage drop detecting circuit |
| CN202034757U (en) * | 2011-04-27 | 2011-11-09 | 北京立华莱康平台科技有限公司 | Protective circuit |
| CN203180485U (en) * | 2013-01-30 | 2013-09-04 | 昆达电脑科技(昆山)有限公司 | Overcurrent protection device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110481324A (en) * | 2019-07-15 | 2019-11-22 | 新乡市光明电器有限公司 | Load control circuit, load control mould group and electric control box |
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Application publication date: 20140806 |
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