CN203312778U - Chip power supply protection circuit - Google Patents
Chip power supply protection circuit Download PDFInfo
- Publication number
- CN203312778U CN203312778U CN2013203635676U CN201320363567U CN203312778U CN 203312778 U CN203312778 U CN 203312778U CN 2013203635676 U CN2013203635676 U CN 2013203635676U CN 201320363567 U CN201320363567 U CN 201320363567U CN 203312778 U CN203312778 U CN 203312778U
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- power supply
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- vout
- effect transistor
- voltage stabilizing
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Abstract
The utility model discloses a chip power supply protection circuit and particularly relates to a protection circuit used for preventing reverse connection of a power supply of a chip with a P-channel field effect transistor. The chip power supply protection circuit comprises power supply wiring ends, a transient suppression diode, a voltage stabilizing diode, filtering capacitors, a P-channel field effect transistor, a current limiting resistor and chip wiring ends. The power supply wiring ends V+ and V- are respectively connected with the positive and negative poles of an external power supply through wires; the transient suppression diode D1 is connected to the power supply wiring ends V+ and V-; the filtering capacitor C1 is connected to the power supply wiring ends V+ and V-; the filtering capacitor C2 is connected to the chip wiring ends Vout+ and Vout-; the drain D of the P-channel field effect transistor is connected with the power wiring end V+, the source S of the P-channel field effect transistor is connected with the chip wiring end Vout+, and the gate G of the P-channel field effect transistor is connected with the positive pole of the voltage stabilizing diode; the negative pole of the voltage stabilizing diode D2 is connected with the chip wiring end Vout+; and the current limiting resistor is connected to the positive pole of the voltage stabilizing diode D2 and the chip wiring end Vout-. The circuit is simple in structure and low in cost, can effectively protect all kinds of electronic equipment powered by a power supply from damage caused by reverse connection of the power supply and reduce possible economic loss in the using process and is applicable to reverse connection protection of a power supply of a circuit or a chip.
Description
Technical field
The utility model discloses a kind of chip power supply protective circuit, particularly a kind of protective circuit of utilizing the P-channel field-effect transistor (PEFT) pipe to prevent the chip power reversal connection.
Background technology
In the work use procedure of power management product, the situation of reverse power connection sometimes can occur, in case reversal connection, the parasitic diode of chip, by conducting, produces very large reverse current, causes chip to burn out.Traditional reverse power connection protective circuit is to connect diode at protected electrical equipment front end, utilizes the reverse blocking voltage of diode pair electric current, and reverse power connection is shielded.But, because there is problem of pressure drop in diode, make the application of this scheme under low voltage condition be subject to significant limitation.When input DC power, the user connects positive-negative polarity instead because of carelessness, may cause damage of equipment, thus economic loss.
Summary of the invention
For defect and deficiency that above-mentioned prior art exists, the purpose of this utility model is, a kind of chip power supply protective circuit is provided, and guarantees that electronic equipment is not subjected to because reverse power connection damages, to reduce the economic loss that may cause in use procedure.
In order to realize above-mentioned task, the utility model adopts following technical solution:
A kind of chip power supply protective circuit, comprise supply terminals, Transient Suppression Diode, voltage stabilizing didoe, filter capacitor, P-channel field-effect transistor (PEFT) pipe, current-limiting resistance and chip terminals, described supply terminals V+ is connected with the positive and negative electrode of external power supply respectively by wire with V-; Described Transient Suppression Diode D1 is connected on supply terminals V+ and V-two ends; The negative pole of described voltage stabilizing didoe D2 is connected with chip terminals Vout+; Described filter capacitor C1 is connected on supply terminals V+ and V-two ends, and C2 is connected to chip terminals Vout+ and Vout-two ends; The drain D of described P-channel field-effect transistor (PEFT) pipe Q is connected with supply terminals V+, and its source S is connected with chip terminals Vout+, and its grid G is connected with the positive pole of voltage stabilizing didoe; Described current-limiting resistance R is connected on the two ends of positive pole and the chip terminals Vout-of voltage stabilizing didoe D2.
The beneficial effects of the utility model are:
When normal wiring, anodal line end V+ and negative terminals V-connect respectively positive source and negative pole, and positive voltage is through P-channel field-effect transistor (PEFT) pipe Q, by voltage stabilizing didoe D2 reverse breakdown, stable positive voltage is applied on the grid G of field effect transistor, makes field effect transistor Q conducting.Now, the conducting internal resistance of field effect transistor is very little, and circuit is similar to short circuit, and power supply output just can work.
When error-polarity connection of power supply, the negative pole of power supply has been received positive terminals V+, and positive source is received negative terminals V-.Now, the grid of field effect transistor Q has added negative voltage, field effect transistor by, electric current, without loop, has effectively avoided chip circuit to burn out, the economic loss that minimizing may cause.
This circuit structure is simple, with low cost, and effectively the various electronic equipments of protection power source power supply are not subjected to the damage caused because of reverse power connection, reduce the economic loss that may occur in use procedure, are applicable to the reverse connecting protection of circuit or chip power.
The accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments the utility model is further explained explanation.
Fig. 1 is a kind of structural representation of the present utility model.
Embodiment
Embodiment 1 as shown in fig. 1, comprise supply terminals, filter capacitor, P-channel field-effect transistor (PEFT) pipe, Transient Suppression Diode, voltage stabilizing didoe, current-limiting resistance and chip terminals, described supply terminals V+ is connected with the positive and negative electrode of external power supply respectively by wire with V-; Described filter capacitor C1 is connected on supply terminals V+ and V-two ends, and C2 is connected to chip terminals Vout+ and Vout-two ends; The drain D of described P-channel field-effect transistor (PEFT) pipe is connected with supply terminals V+, and its source S is connected with chip terminals Vout+, and its grid G is connected with the positive pole of voltage stabilizing didoe D2; Described Transient Suppression Diode D1 is connected on supply terminals V+ and V-two ends; The negative pole of described voltage stabilizing didoe D2 is connected with chip terminals Vout+; Described current-limiting resistance R is connected on the two ends of positive pole and the chip terminals Vout-of voltage stabilizing didoe D2.In actual applications, the numerical value of current-limiting resistance R can not be too small, to prevent the excessive electronic devices and components that burn out of electric current, the general 33k Ω that selects, filter capacitor needs higher withstand voltage, therefore advise C1, C2 respectively value be 100u/50V, 220n/50V, the model of Transient Suppression Diode D1 is generally selected SMAJ58CA, and the model of voltage stabilizing didoe D2 is generally selected IN5245.
Claims (4)
1. chip power supply protective circuit, it is characterized in that, comprise supply terminals V+ and V-, diode D1 and D2, filter capacitor C1 and C2, P-channel field-effect transistor (PEFT) pipe Q, current-limiting resistance R and chip terminals Vout-and Vout+, described supply terminals V+ is connected with the positive and negative electrode of external power supply respectively by wire with V-; Described Transient Suppression Diode D1 is connected on supply terminals V+ and V-two ends; The negative pole of described voltage stabilizing didoe D2 is connected with chip terminals Vout+.
2. chip power supply protective circuit as required as claim 1, is characterized in that, described filter capacitor C1 is connected on supply terminals V+ and V-two ends; Described filter capacitor C2 is connected to chip terminals Vout+ and Vout-two ends.
3. chip power supply protective circuit as required as claim 1, is characterized in that, the drain D of described P-channel field-effect transistor (PEFT) pipe Q is connected with supply terminals V+, and its source S is connected with chip terminals Vout+, and its grid G is connected with the positive pole of voltage stabilizing didoe D2.
4. chip power supply protective circuit as required as claim 1, is characterized in that, described current-limiting resistance R is connected on the two ends of positive pole and the chip terminals Vout-of voltage stabilizing didoe D2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203635676U CN203312778U (en) | 2013-06-24 | 2013-06-24 | Chip power supply protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203635676U CN203312778U (en) | 2013-06-24 | 2013-06-24 | Chip power supply protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203312778U true CN203312778U (en) | 2013-11-27 |
Family
ID=49618953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203635676U Expired - Fee Related CN203312778U (en) | 2013-06-24 | 2013-06-24 | Chip power supply protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203312778U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743076A (en) * | 2014-12-12 | 2016-07-06 | 安徽艾可蓝节能环保科技有限公司 | Power source reversal connection prevention circuit |
| CN106788396A (en) * | 2016-12-16 | 2017-05-31 | 山东浪潮商用***有限公司 | A kind of DC interface circuits and electronic equipment |
-
2013
- 2013-06-24 CN CN2013203635676U patent/CN203312778U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743076A (en) * | 2014-12-12 | 2016-07-06 | 安徽艾可蓝节能环保科技有限公司 | Power source reversal connection prevention circuit |
| CN106788396A (en) * | 2016-12-16 | 2017-05-31 | 山东浪潮商用***有限公司 | A kind of DC interface circuits and electronic equipment |
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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: 20131127 Termination date: 20140624 |
|
| EXPY | Termination of patent right or utility model |