CN201877776U - Overflow overload short-circuit protection circuit - Google Patents
Overflow overload short-circuit protection circuit Download PDFInfo
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- CN201877776U CN201877776U CN2010206101126U CN201020610112U CN201877776U CN 201877776 U CN201877776 U CN 201877776U CN 2010206101126 U CN2010206101126 U CN 2010206101126U CN 201020610112 U CN201020610112 U CN 201020610112U CN 201877776 U CN201877776 U CN 201877776U
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Abstract
The utility model relates to an overflow overload short-circuit protection circuit, which is used for flashers, inverters and the like. The overflow overload short-circuit protection circuit is connected with a field-effect transistor, a source electrode of the field-effect transistor is respectively connected with a detection resistor R1 and an input end of a switch circuit, a common end of the switch circuit is connected with the other end of the detection resistor R1, an output end of the switch circuit is connected with a gate electrode of the field-effect transistor, and the other end of the detection resistor R2 is further connected with a load L. The overflow overload short-circuit protection circuit is simple in structure ad low in cost, and is capable of protecting electrical circuits in cases of overflow, overload, short circuit and the like so as to avoid circuit damage or damage of other devices.
Description
Technical field:
The utility model relates to a kind of over-current and-load short-circuit protection circuit, can be used for flasher, inverter etc.
Background technology:
Flasher in use short circuit often occurs, connects phenomenons such as electricity, loose contact.Easy like this appliance circuit and the components and parts thereof of burning need increase protective circuit to appliance circuit.Current have a lot of types flasher all do not have protective circuit.
Summary of the invention:
The purpose of this utility model just provides a kind of over-current and-load short-circuit protection circuit.The utility model is simple in structure, and design concept is ingenious, and is with low cost.
The technical scheme that the utility model provides is:
The over-current and-load short-circuit protection circuit; be connected with field effect transistor; the drain electrode of field effect transistor links to each other with positive source; the source electrode of field effect transistor links to each other with the input that detects resistance R 1, switching circuit respectively; the common port of switching circuit links to each other with the other end that detects resistance R 1; the output of switching circuit links to each other with the gate pole of field effect transistor, and the other end that detects resistance R 1 also links to each other with load L.
Preferably, the source electrode of field effect transistor links to each other with detection resistance R 1, resistance R 2 respectively, input, capacitor C 1 that the other end of resistance R 2 connects switching circuit respectively link to each other, capacitor C 1 links to each other with the other end that detects resistance R 1, the output of switching circuit links to each other with the gate pole of field effect transistor, and the other end that detects resistance R 1 also links to each other with load L.
Preferably, switching circuit is a controllable silicon, and the anode of silicon controlled is the output of switching circuit, and the silicon controlled negative electrode is the common port of switching circuit, and silicon controlled is controlled the very input of switching circuit.
Preferably, switching circuit comprises triode Q1, triode Q2, the base stage of triode Q1 links to each other with the collector electrode of triode Q2 becomes the input of switching circuit, the emission of triode Q1 is the common port of switching circuit very, and the base stage of the collector electrode of triode Q1, triode Q2, the emitter of triode Q2 link to each other becomes the output of switching circuit.
Preferably, switching circuit comprises triode Q1, triode Q2, the base stage of triode Q1 links to each other with the collector electrode of triode Q2 becomes the input of switching circuit, the emission of triode Q1 is the common port of switching circuit very, the common port of the base stage of the collector electrode of triode Q1, triode Q2 links to each other with the emitter of triode Q2 by resistance R 3, and the common port of the emitter of resistance R 3 and triode Q2 becomes the output of switching circuit.
The utility model is simple in structure, and cost is low, can play a protective role to appliance circuit under situations such as overcurrent, overload, short circuit, avoids damaging circuit and components and parts thereof.
Detection resistance R 1 can detect the size by load current, comes decision circuitry whether fault is arranged.If electric current is excessive, make the switching circuit conducting, the gate pole of field effect transistor, the current potential of source electrode diminish, and field effect transistor is ended, thereby avoid the excessive circuit that burns out of electric current.
Description of drawings
Fig. 1 is the circuit diagram of embodiment 1.
Fig. 2 is the circuit diagram of embodiment 2.
Fig. 3 is the circuit diagram of embodiment 3.
Fig. 4 is the circuit diagram of embodiment 4.
Embodiment
Detect resistance and can select conventional, electric-resistance, also can select wire, also can select the Copper Foil on the circuit board.Or select other conductors as detecting resistance.
Embodiment 1
The over-current and-load short-circuit protection circuit is connected with field effect transistor, and the drain electrode of field effect transistor links to each other with power supply B.The source electrode of field effect transistor links to each other with the input that detects resistance R 1, switching circuit respectively, the common port of switching circuit links to each other with the other end that detects resistance R 1, the output of switching circuit links to each other with the gate pole of field effect transistor, and the other end that detects resistance R 1 also links to each other with load L.
Embodiment 2
The over-current and-load short-circuit protection circuit is connected with field effect transistor, and the drain electrode of field effect transistor links to each other with power supply B.The source electrode of field effect transistor links to each other with detection resistance R 1, resistance R 2 respectively, input, capacitor C 1 that the other end of resistance R 2 connects switching circuit respectively link to each other, capacitor C 1 links to each other with the other end that detects resistance R 1, the output of switching circuit links to each other with the gate pole of field effect transistor, and the other end that detects resistance R 1 also links to each other with load L.
Embodiment 3
The over-current and-load short-circuit protection circuit is connected with field effect transistor, and the drain electrode of field effect transistor links to each other with power supply B.The source electrode of field effect transistor links to each other with detection resistance R 1, resistance R 2 respectively, input, capacitor C 1 that the other end of resistance R 2 connects switching circuit respectively link to each other, capacitor C 1 links to each other with the other end that detects resistance R 1, the output of switching circuit links to each other with the gate pole of field effect transistor, and the other end that detects resistance R 1 also links to each other with load L.Switching circuit selects controllable silicon, and the anode of silicon controlled is the output of switching circuit, and the silicon controlled negative electrode is the common port of switching circuit, and silicon controlled is controlled the very input of switching circuit.
Embodiment 4
The over-current and-load short-circuit protection circuit is connected with field effect transistor, and the drain electrode of field effect transistor links to each other with power supply B.The source electrode of field effect transistor links to each other with detection resistance R 1, resistance R 2 respectively, input, capacitor C 1 that the other end of resistance R 2 connects switching circuit respectively link to each other, capacitor C 1 links to each other with the other end that detects resistance R 1, the output of switching circuit links to each other with the gate pole of field effect transistor, and the other end that detects resistance R 1 also links to each other with load L.Switching circuit comprises triode Q1, triode Q2 and resistance R 3.The base stage of triode Q1 links to each other with the collector electrode of triode Q2 becomes the input of switching circuit, the emission of triode Q1 is the common port of switching circuit very, the common port of the base stage of the collector electrode of triode Q1, triode Q2 links to each other with the emitter of triode Q2 by resistance R 3, and the common port of the emitter of resistance R 3 and triode Q2 becomes the output of switching circuit.
Claims (5)
1. over-current and-load short-circuit protection circuit; be connected with field effect transistor; it is characterized in that; the source electrode of field effect transistor links to each other with the input that detects resistance R 1, switching circuit respectively; the common port of switching circuit links to each other with the other end that detects resistance R 1; the output of switching circuit links to each other with the gate pole of field effect transistor, and the other end that detects resistance R 1 also links to each other with load L.
2. according to the described over-current and-load short-circuit protection circuit of claim 1; it is characterized in that; the source electrode of field effect transistor links to each other with detection resistance R 1, resistance R 2 respectively; input, capacitor C 1 that the other end of resistance R 2 connects switching circuit respectively link to each other; capacitor C 1 links to each other with the other end that detects resistance R 1; the output of switching circuit links to each other with the gate pole of field effect transistor, and the other end that detects resistance R 1 also links to each other with load L.
3. according to claim 1 or 2 described over-current and-load short-circuit protection circuits; it is characterized in that switching circuit is a controllable silicon, the anode of silicon controlled is the output of switching circuit; the silicon controlled negative electrode is the common port of switching circuit, and silicon controlled is controlled the very input of switching circuit.
4. according to claim 1 or 2 described over-current and-load short-circuit protection circuits; it is characterized in that; switching circuit comprises triode Q1, triode Q2; the base stage of triode Q1 links to each other with the collector electrode of triode Q2 becomes the input of switching circuit; the emission of triode Q1 is the common port of switching circuit very, and the base stage of the collector electrode of triode Q1, triode Q2, the emitter of triode Q2 link to each other becomes the output of switching circuit.
5. according to the described over-current and-load short-circuit protection circuit of claim 4; it is characterized in that; switching circuit comprises triode Q1, triode Q2; the base stage of triode Q1 links to each other with the collector electrode of triode Q2 becomes the input of switching circuit; the emission of triode Q1 is the common port of switching circuit very; the common port of the base stage of the collector electrode of triode Q1, triode Q2 links to each other with the emitter of triode Q2 by resistance R 3, and the common port of the emitter of resistance R 3 and triode Q2 becomes the output of switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206101126U CN201877776U (en) | 2010-11-17 | 2010-11-17 | Overflow overload short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206101126U CN201877776U (en) | 2010-11-17 | 2010-11-17 | Overflow overload short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201877776U true CN201877776U (en) | 2011-06-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206101126U Expired - Fee Related CN201877776U (en) | 2010-11-17 | 2010-11-17 | Overflow overload short-circuit protection circuit |
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| Country | Link |
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| CN (1) | CN201877776U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104600660A (en) * | 2015-01-09 | 2015-05-06 | 广东瑞德智能科技股份有限公司 | Low-power-consumption short circuit protection circuit |
| CN104734123A (en) * | 2013-12-18 | 2015-06-24 | 成都鼎桥通信技术有限公司 | Intrinsically-safe explosion-proof circuit for lithium battery |
| CN106454171A (en) * | 2016-11-15 | 2017-02-22 | 深圳市视维科技有限公司 | Power supply circuit of CA card of set-top-box |
-
2010
- 2010-11-17 CN CN2010206101126U patent/CN201877776U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734123A (en) * | 2013-12-18 | 2015-06-24 | 成都鼎桥通信技术有限公司 | Intrinsically-safe explosion-proof circuit for lithium battery |
| CN104600660A (en) * | 2015-01-09 | 2015-05-06 | 广东瑞德智能科技股份有限公司 | Low-power-consumption short circuit protection circuit |
| CN106454171A (en) * | 2016-11-15 | 2017-02-22 | 深圳市视维科技有限公司 | Power supply circuit of CA card of set-top-box |
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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: 20110622 Termination date: 20121117 |