CN205070388U - Overcurrent protection circuit - Google Patents
Overcurrent protection circuit Download PDFInfo
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- CN205070388U CN205070388U CN201520534053.1U CN201520534053U CN205070388U CN 205070388 U CN205070388 U CN 205070388U CN 201520534053 U CN201520534053 U CN 201520534053U CN 205070388 U CN205070388 U CN 205070388U
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Abstract
The utility model relates to a circuit, concretely relates to overcurrent protection circuit. Overcurrent protection circuit, including the oscillator, field effect transistor and triode, the power pin of oscillator is connected, field effect transistor Q1's source electrode and field effect transistor Q4's source electrode is connected and connect feedback resistance R10 simultaneously, resistance R10 is ground connection simultaneously, input pin + the IN of oscillator passes through diode D1 and is connected with resistance R10 and passes through diode D2 and the connection of oscillator PWN pin simultaneously, and diode D1's negative pole and pin + IN1 are connected, and diode D2's negative pole and pin + IN are connected, and divider resistance R1 and resistance R2 are connected to the REF pin of oscillator, resistance R2 one end ground connection, and pin - IN end is connected to resistance R1 and resistance R2's common port.
Description
technical field:
The utility model relates to a kind of circuit, is specifically related to a kind of current foldback circuit.
background technology:
The way of output of pulse width modulation, has been used in many consumption kinds very widely, has particularly been applied in portable electronic product.Using battery as in the portable product of energy source, power consumption is one of most important Consideration always, and the advantage that the way of output of pulse-width modulation is maximum is exactly its high power efficiency.In pulse width regulating circuit, the measure of overcurrent protection is not fully up to expectations.
summary of the invention:
The utility model is just to provide current foldback circuit in a kind of pulse width regulating circuit.
The technical scheme that the utility model provides is:
Current foldback circuit, include oscillator, field effect transistor and triode, the power pins of oscillator connects power supply, C1 with the C2 pin of oscillator is connected power supply respectively by resistance R4 with resistance R5, E1, E2, GND pin ground connection simultaneously of oscillator, C1 with the C2 pin of oscillator is connected respectively with two-way circuit respectively, the C2 pin of oscillator is connected with the base stage of the grid of field effect transistor Q1 and triode Q6 simultaneously, the C1 pin of oscillator is connected with the base stage of the grid of field effect transistor Q4 and triode Q5 simultaneously, the emitter of triode Q6 is connected with triode Q5 emitter and simultaneously ground connection, the base stage of triode Q6 is connected with triode Q5 base stage and simultaneously ground connection, triode Q5 collector electrode is connected with the grid of field effect transistor Q3, the collector electrode of triode Q6 is connected with the grid of field effect transistor Q2, the drain electrode of field effect transistor Q3 exports after being connected with the source electrode of field effect transistor Q4, the drain electrode of field effect transistor Q1 exports after being connected with the grid of field effect transistor Q2, and the drain electrode of field effect transistor Q2 is connected with field effect transistor Q3 drain electrode and is connected power supply simultaneously, the grid of field effect transistor Q2 is connected with the grid of field effect transistor Q3 simultaneously and connects power supply simultaneously, the source electrode of field effect transistor Q1 is connected with the source electrode of field effect transistor Q4 and is connected feedback resistance R10 simultaneously, resistance R10 is ground connection simultaneously, input pin+the IN of described oscillator is connected with resistance R10 by diode D1 and is connected by diode D2 and oscillator PWN pin simultaneously, the negative pole of diode D1 is connected with pin+IN1, the negative pole of diode D2 is connected with pin+IN, the REF pin of oscillator connects divider resistance R1 and resistance R2, resistance R2 one end ground connection, resistance R1 is connected pin-IN and holds with the common port of resistance R2.
Concrete, described oscillator Cr pin is by electric capacity C ground connection, and Rr pin is by resistance R3 ground connection.
Concrete, series resistance R7 and resistance R6 is set between the grid of described field effect transistor Q1 and the base stage of triode Q6.
Concrete, series resistance R14 and resistance R13 is set between the grid of described field effect transistor Q4 and the base stage of triode Q5.
Concrete, the drain electrode of described field effect transistor Q2 connects power supply by resistance R15, and field effect transistor Q3 drain electrode connects power supply by resistance R8.
The utility model structure is simple; design concept is ingenious; circuit operates steadily reliably, in circuit running, when the electric current at resistance R10 place increases; the magnitude of voltage of+IN input increases; when the magnitude of voltage of IN input is greater than the reference voltage of-IN end, PWN can control to export and close, and to feed back to+IN by diode D2 thus lock it be high voltage always; circuit is played a protective role, extends the useful life of product.The utility model can be widely used in charger, switch power supply.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment.
Embodiment
Be illustrated in figure 1.
Current foldback circuit, include oscillator, field effect transistor and triode, the power pins of oscillator connects power supply, C1 with the C2 pin of oscillator is connected power supply respectively by resistance R4 with resistance R5, E1, E2, GND pin ground connection simultaneously of oscillator, C1 with the C2 pin of oscillator is connected respectively with two-way circuit respectively; The C2 pin of oscillator is connected with the base stage of the grid of field effect transistor Q1 and triode Q6 simultaneously, arranges series resistance R7 and resistance R6 between the grid of described field effect transistor Q1 and the base stage of triode Q6.The C1 pin of oscillator is connected with the base stage of the grid of field effect transistor Q4 and triode Q5 simultaneously, arranges series resistance R14 and resistance R13 between the grid of described field effect transistor Q4 and the base stage of triode Q5.The emitter of triode Q6 is connected with triode Q5 emitter and simultaneously ground connection, the base stage of triode Q6 is connected with triode Q5 base stage and simultaneously ground connection, triode Q5 collector electrode is connected with the grid of field effect transistor Q3, the collector electrode of triode Q6 is connected with the grid of field effect transistor Q2, the drain electrode of field effect transistor Q3 exports after being connected with the source electrode of field effect transistor Q4, the drain electrode of field effect transistor Q1 exports after being connected with the grid of field effect transistor Q2, and the drain electrode of field effect transistor Q2 is connected with field effect transistor Q3 drain electrode and is connected power supply simultaneously, the grid of field effect transistor Q2 is connected with the grid of field effect transistor Q3 simultaneously and connects power supply simultaneously.The drain electrode of described field effect transistor Q2 connects power supply by resistance R15, and field effect transistor Q3 drain electrode connects power supply by resistance R8.
The source electrode of field effect transistor Q1 is connected with the source electrode of field effect transistor Q4 and is connected feedback resistance R10 simultaneously, resistance R10 is ground connection simultaneously, input pin+the IN of described oscillator is connected with resistance R10 by diode D1 and is connected by diode D2 and oscillator PWN pin simultaneously, the negative pole of diode D1 is connected with pin+IN1, the negative pole of diode D2 is connected with pin+IN, the REF pin of oscillator connects divider resistance R1 and resistance R2, resistance R2 one end ground connection, resistance R1 is connected pin-IN and holds with the common port of resistance R2.
Described oscillator Cr pin is by electric capacity C ground connection, and Rr pin is by resistance R3 ground connection.
Claims (5)
1. current foldback circuit, include oscillator, field effect transistor and triode, the power pins of oscillator connects power supply, C1 with the C2 pin of oscillator is connected power supply respectively by resistance R4 with resistance R5, E1, E2, GND pin ground connection simultaneously of oscillator, C1 with the C2 pin of oscillator is connected respectively with two-way circuit respectively, the C2 pin of oscillator is connected with the base stage of the grid of field effect transistor Q1 and triode Q6 simultaneously, the C1 pin of oscillator is connected with the base stage of the grid of field effect transistor Q4 and triode Q5 simultaneously, the emitter of triode Q6 is connected with triode Q5 emitter and simultaneously ground connection, the base stage of triode Q6 is connected with triode Q5 base stage and simultaneously ground connection, triode Q5 collector electrode is connected with the grid of field effect transistor Q3, the collector electrode of triode Q6 is connected with the grid of field effect transistor Q2, the drain electrode of field effect transistor Q3 exports after being connected with the source electrode of field effect transistor Q4, the drain electrode of field effect transistor Q1 exports after being connected with the grid of field effect transistor Q2, and the drain electrode of field effect transistor Q2 is connected with field effect transistor Q3 drain electrode and is connected power supply simultaneously, the grid of field effect transistor Q2 is connected with the grid of field effect transistor Q3 simultaneously and connects power supply simultaneously, it is characterized in that, the source electrode of field effect transistor Q1 is connected with the source electrode of field effect transistor Q4 and is connected feedback resistance R10 simultaneously, resistance R10 is ground connection simultaneously, input pin+the IN of described oscillator is connected with resistance R10 by diode D1 and is connected by diode D2 and oscillator PWN pin simultaneously, the negative pole of diode D1 is connected with pin+IN1, the negative pole of diode D2 is connected with pin+IN, the REF pin of oscillator connects divider resistance R1 and resistance R2, resistance R2 one end ground connection, resistance R1 is connected pin-IN and holds with the common port of resistance R2.
2. current foldback circuit according to claim 1, is characterized in that, described oscillator Cr pin is by electric capacity C ground connection, and Rr pin is by resistance R3 ground connection.
3. current foldback circuit according to claim 1, is characterized in that, arrange series resistance R7 and resistance R6 between the grid of described field effect transistor Q1 and the base stage of triode Q6.
4. current foldback circuit according to claim 1, is characterized in that, arrange series resistance R14 and resistance R13 between the grid of described field effect transistor Q4 and the base stage of triode Q5.
5. current foldback circuit according to claim 1, is characterized in that, the drain electrode of described field effect transistor Q2 connects power supply by resistance R15, and field effect transistor Q3 drain electrode connects power supply by resistance R8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520534053.1U CN205070388U (en) | 2015-07-22 | 2015-07-22 | Overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520534053.1U CN205070388U (en) | 2015-07-22 | 2015-07-22 | Overcurrent protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205070388U true CN205070388U (en) | 2016-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520534053.1U Active CN205070388U (en) | 2015-07-22 | 2015-07-22 | Overcurrent protection circuit |
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| CN (1) | CN205070388U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071339A (en) * | 2015-07-22 | 2015-11-18 | 濮阳市立圆汽车电器有限公司 | Over-current protection circuit |
-
2015
- 2015-07-22 CN CN201520534053.1U patent/CN205070388U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071339A (en) * | 2015-07-22 | 2015-11-18 | 濮阳市立圆汽车电器有限公司 | Over-current protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Crest factor overcurrent protection circuit applied to electronic ballast Effective date of registration: 20160929 Granted publication date: 20160302 Pledgee: Industrial Commercial Bank of China Ltd sub district subbranch Pledgor: PUYANG LIYUAN AUTO ELECTRIC CO., LTD. Registration number: 2016410000015 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Crest factor overcurrent protection circuit applied to electronic ballast Effective date of registration: 20190923 Granted publication date: 20160302 Pledgee: Bank of China, Limited by Share Ltd, Puyang branch Pledgor: PUYANG LIYUAN AUTO ELECTRIC CO., LTD. Registration number: Y2019980000186 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20191231 Granted publication date: 20160302 Pledgee: Industrial Commercial Bank of China Ltd sub district subbranch Pledgor: PUYANG LIYUAN AUTO ELECTRIC CO., LTD. Registration number: 2016410000015 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20201117 Granted publication date: 20160302 Pledgee: Bank of China Limited by Share Ltd. Puyang branch Pledgor: PUYANG LIYUAN AUTO ELECTRIC APPLIANCE Co.,Ltd. Registration number: Y2019980000186 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Overcurrent protection circuit Effective date of registration: 20201118 Granted publication date: 20160302 Pledgee: Taiqian County sub branch of China Post Savings Bank Co.,Ltd. Pledgor: PUYANG LIYUAN AUTO ELECTRIC APPLIANCE Co.,Ltd. Registration number: Y2020980008227 |