CN204349413U - A kind of circuit protection device - Google Patents
A kind of circuit protection device Download PDFInfo
- Publication number
- CN204349413U CN204349413U CN201420819802.0U CN201420819802U CN204349413U CN 204349413 U CN204349413 U CN 204349413U CN 201420819802 U CN201420819802 U CN 201420819802U CN 204349413 U CN204349413 U CN 204349413U
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- China
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- resistance
- triode
- pin
- amplifier
- electric capacity
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- Expired - Fee Related
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Abstract
The utility model belongs to circuit protection technical field, particularly relate to a kind of circuit protection device, comprise input J1, output J2, amplifying circuit, comparison circuit, described amplifying circuit comprises amplifier U1, electric capacity C2, the pin 2 of described amplifier U1 connects the pin 2 of input J1, one end of electric capacity C2, its pin 3 connects the other end of electric capacity C2, the pin 1 of input J1, described comparison circuit comprises amplifier U2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, voltage-stabiliser tube D2, diode D1, triode Q1, triode Q2, one end of the pin 2 connecting resistance R1 of described amplifier U2, one end of its pin 3 connecting resistance R2, the negative electrode of diode D1, its pin 1 connects the base stage of triode Q1, one end of resistance R3, one end of resistance R4, the base stage of triode Q2.
Description
Technical field
The utility model belongs to circuit protection technical field, particularly relates to a kind of circuit protection device.
Background technology
Traditionally, for avoiding circuit because overheated or flow through overcurrent and damage, usually through the mode of fuse (fuse) or positive temperature coefficient element that arranges to reach the object of protective circuit.
Fuse and circuit connected in series are arranged, when circuit have overcurrent by time, fuse can be fused with interruptive current.PTC element be then temperature rise to a certain critical temperature or have overcurrent by time, relatively improve its resistance value, suppress overcurrent to pass through by this.But, as long as fuse is once fusing and irrecoverable, often disposable use can only be done; PTC element is then to be subject to temperature interference, and material cost is higher.
Summary of the invention
The utility model provides a kind of circuit protection device, can only once use, the problem that PTC element cost is high to solve fuse traditional in above-mentioned background technology.
The technical problem that the utility model solves realizes by the following technical solutions: the utility model provides a kind of circuit protection device, it is characterized in that: comprise input J1, output J2, amplifying circuit, comparison circuit, described amplifying circuit comprises amplifier U1, the pin 2 of electric capacity C2, described amplifier U1 connects the pin 2 of input J1, one end of electric capacity C2, its pin 3 connects the other end of electric capacity C2, the pin 1 of input J1, described comparison circuit comprises amplifier U2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, voltage-stabiliser tube D2, diode D1, triode Q1, one end of the pin 2 connecting resistance R1 of triode Q2, described amplifier U2, one end of its pin 3 connecting resistance R2, the negative electrode of diode D1, its pin 1 connects the base stage of triode Q1, one end of resistance R3, one end of resistance R4, the base stage of triode Q2, the pin 1 of another termination amplifier U1 of described resistance R1, the other end of the other end connecting resistance R6 of described resistance R2, the emitter pole of triode Q1, the negative electrode of voltage-stabiliser tube D2, the anode of described voltage-stabiliser tube D2 connects the emitter of triode Q2, and the collector electrode of described triode Q2 connects one end of electric capacity C1, output J2, the other end ground connection of described electric capacity C1, one end of the other end connecting resistance R5 of described resistance R3, another termination voltage+12V of described resistance R5, the collector electrode of another termination triode Q1 of described resistance R6 and all meet voltage+12V, the other end of the anode connecting resistance R4 of described diode D1.
Described triode Q1 selects PNP transistor.
Described triode Q2 selects NPN transistor.
Described amplifier U1 selects operational amplifier.
Described amplifier U2 selects comparison amplifier.
The beneficial effects of the utility model are:
The signal that input J1 gathers amplifies by the operational amplifier U1 of 1 this patent, be delivered in comparison circuit, compared by comparison amplifier U2, when circuital current is excessive, triode Q1 and voltage-stabiliser tube D2 acts on, comparison amplifier U2 is reversed, makes output voltage be 0, play the effect of open circuit.
The structure of 2 this patents is simple, and circuit easily realizes, and each components and parts are relatively cheap, and low cost of manufacture, can also reuse, and solve in tradition application, fuse can only once use, the problem that PTC element cost is high.
The triode Q2 of 3 this patents and electric capacity C1 Parallel Design, substantially increase the antijamming capability of circuit, improve the stability of work.
4 this patents use less components and parts with regard to the effect of energy realizing circuit protection, and volume is little, greatly reduces costs, easy of integration, and cost performance is higher, applied range.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further:
Embodiment:
The present embodiment comprises: input J1, output J2, amplifying circuit, comparison circuit, as shown in Figure 1.
Amplifying circuit comprises amplifier U1, electric capacity C2, and the pin 2 of amplifier U1 connects one end of the pin 2 of input J1, electric capacity C2, and its pin 3 connects the other end of electric capacity C2, the pin 1 of input J1.
Comparison circuit comprises amplifier U2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, voltage-stabiliser tube D2, diode D1, triode Q1, triode Q2, one end of the pin 2 connecting resistance R1 of amplifier U2, one end of its pin 3 connecting resistance R2, the negative electrode of diode D1, its pin 1 connects the base stage of triode Q1, one end of resistance R3, one end of resistance R4, the base stage of triode Q2, the pin 1 of another termination amplifier U1 of resistance R1, the other end of the other end connecting resistance R6 of resistance R2, the emitter pole of triode Q1, the negative electrode of voltage-stabiliser tube D2, the anode of voltage-stabiliser tube D2 connects the emitter of triode Q2, the collector electrode of triode Q2 connects one end of electric capacity C1, output J2, the other end ground connection of electric capacity C1, one end of the other end connecting resistance R5 of resistance R3, another termination voltage+12V of resistance R5, the collector electrode of another termination triode Q1 of resistance R6 and all meet voltage+12V, the other end of the anode connecting resistance R4 of diode D1.
Utilize technical scheme described in the utility model, or those skilled in the art being under the inspiration of technical solutions of the utility model, designing similar technical scheme, and reach above-mentioned technique effect, is all fall into protection range of the present utility model.
Claims (5)
1. a circuit protection device, is characterized in that: comprise input J1, output J2, amplifying circuit, comparison circuit, described amplifying circuit comprises amplifier U1, the pin 2 of electric capacity C2, described amplifier U1 connects the pin 2 of input J1, one end of electric capacity C2, its pin 3 connects the other end of electric capacity C2, the pin 1 of input J1, described comparison circuit comprises amplifier U2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, voltage-stabiliser tube D2, diode D1, triode Q1, one end of the pin 2 connecting resistance R1 of triode Q2, described amplifier U2, one end of its pin 3 connecting resistance R2, the negative electrode of diode D1, its pin 1 connects the base stage of triode Q1, one end of resistance R3, one end of resistance R4, the base stage of triode Q2, the pin 1 of another termination amplifier U1 of described resistance R1, the other end of the other end connecting resistance R6 of described resistance R2, the emitter pole of triode Q1, the negative electrode of voltage-stabiliser tube D2, the anode of described voltage-stabiliser tube D2 connects the emitter of triode Q2, and the collector electrode of described triode Q2 connects one end of electric capacity C1, output J2, the other end ground connection of described electric capacity C1, one end of the other end connecting resistance R5 of described resistance R3, another termination voltage+12V of described resistance R5, the collector electrode of another termination triode Q1 of described resistance R6 and all meet voltage+12V, the other end of the anode connecting resistance R4 of described diode D1.
2. a kind of circuit protection device according to claim 1, is characterized in that: described triode Q1 selects PNP transistor.
3. a kind of circuit protection device according to claim 1, is characterized in that: described triode Q2 selects NPN transistor.
4. a kind of circuit protection device according to claim 1, is characterized in that: described amplifier U1 selects operational amplifier.
5. a kind of circuit protection device according to claim 1, is characterized in that: described amplifier U2 selects comparison amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420819802.0U CN204349413U (en) | 2014-12-19 | 2014-12-19 | A kind of circuit protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420819802.0U CN204349413U (en) | 2014-12-19 | 2014-12-19 | A kind of circuit protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204349413U true CN204349413U (en) | 2015-05-20 |
Family
ID=53232656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420819802.0U Expired - Fee Related CN204349413U (en) | 2014-12-19 | 2014-12-19 | A kind of circuit protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204349413U (en) |
-
2014
- 2014-12-19 CN CN201420819802.0U patent/CN204349413U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150520 Termination date: 20151219 |
|
| EXPY | Termination of patent right or utility model |