CN203151089U - Protection circuit capable of preventing reverse connection of chip power supply - Google Patents
Protection circuit capable of preventing reverse connection of chip power supply Download PDFInfo
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- CN203151089U CN203151089U CN 201320119475 CN201320119475U CN203151089U CN 203151089 U CN203151089 U CN 203151089U CN 201320119475 CN201320119475 CN 201320119475 CN 201320119475 U CN201320119475 U CN 201320119475U CN 203151089 U CN203151089 U CN 203151089U
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- power supply
- voltage stabilizing
- terminals
- protection circuit
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Abstract
The utility model discloses a protection circuit capable of preventing reverse connection of a chip power supply, and particularly relates to a protection circuit capable of preventing reverse connection of the chip power supply by using a P-channel field effect transistor. The protection circuit comprises power supply terminals, filter capacitors, the P-channel field effect transistor, a voltage stabilizing diode, a current limiting resistor and a chip terminal, wherein the power supply terminal V+ and V- are connected with positive and negative electrodes of an external power supply respectively; the filter capacitor C1 is connected to two ends of the power supply terminals V+ and V-, and the capacitor C2 is connected to two ends of the power terminal V- and the chip terminal Vout+; a drain electrode D of the P-channel field effect transistor is connected with the power terminal V+, a source electrode S is connected with the chip terminal Vout+, and a grid electrode G is connected with a positive electrode of the voltage stabilizing diode; a negative electrode of the voltage stabilizing diode is connected with the chip terminal Vout+; and the current limiting resistor R is connected to two ends of the positive electrode of the voltage stabilizing diode D and the chip terminal Vout-. The protection circuit is simple in structure and low in cost, can effectively protect various electronic devices of power supply from being damaged by reverse connection of the power supply, reduces economic loss which may appear in the process of use, and is applicable to reverse connection protection of circuits or chip power supplies.
Description
Technical field
The utility model discloses a kind of protective circuit that prevents the chip power reversal connection, 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 of power management product, the situation of power supply reversal connection sometimes can take place, in case reversal connection, the parasitic diode of chip produces very large reverse current with conducting, causes chip to burn out.Traditional power supply reverse-connection protection circuit is to connect diode at protected electrical equipment front end, utilizes the reverse blocking voltage of diode pair electric current, and reversal connection shields to power supply.But because there is problem of pressure drop in diode, make the application of this scheme under low voltage condition be subjected to significant limitation.When input DC power, the user connects positive-negative polarity instead because of carelessness, then may cause device damage, thereby causes economic loss.
Summary of the invention
At defective and deficiency that above-mentioned prior art exists, the purpose of this utility model is, a kind of protective circuit that prevents the chip power reversal connection is provided, and guarantees that electronic equipment is not subjected to because the power supply reversal connection damages, to reduce the economic loss that may cause in the use.
In order to realize above-mentioned task, the utility model adopts following technical solution:
A kind of protective circuit that prevents the chip power reversal connection, comprise supply terminals, filter capacitor, P-channel field-effect transistor (PEFT) pipe, voltage stabilizing didoe, current-limiting resistance and chip terminals, described supply terminals V+ links to each other with the positive and negative electrode of external power supply respectively by lead with V-; Described filter capacitor C1 is connected on supply terminals V+ and V-two ends, and C2 is connected supply terminals V-and chip terminals Vout+ two ends; The drain D of described P-channel field-effect transistor (PEFT) pipe links to each other with supply terminals V+, and its source S links to each other with chip terminals Vout+, and its grid G links to each other with the positive pole of voltage stabilizing didoe; The negative pole of described voltage stabilizing didoe D links to each other 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 D.
The beneficial effects of the utility model are:
When normal wiring, anodal line end V+ and negative terminals V-connect positive source and negative pole respectively, and positive voltage with voltage stabilizing didoe D reverse breakdown, is clipped on the grid G of field effect transistor stable positive voltage through P-channel field-effect transistor (PEFT) pipe Q, makes field effect transistor Q conducting.At this moment, the conducting internal resistance of field effect transistor is very little, and circuit is similar to short circuit, and power supply output just can operate as normal.
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-.At this moment, the grid of field effect transistor Q has added negative voltage, field effect transistor by, electric current does not have the loop, has effectively avoided chip circuit to burn out, the economic loss that minimizing may cause.
This circuit structure is simple, with low cost, can effectively protect the various electronic equipments of power supply power supply not to be subjected to the damage that causes because of the power supply reversal connection, reduces the economic loss that may occur in the use, is applicable to the reverse connecting protection of circuit or chip power.
Description of drawings
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, voltage stabilizing didoe, current-limiting resistance and chip terminals, described supply terminals V+ links to each other with the positive and negative electrode of external power supply respectively by lead with V-; Described filter capacitor C1 is connected on supply terminals V+ and V-two ends, and C2 is connected supply terminals V-and chip terminals Vout+ two ends; The drain D of described P-channel field-effect transistor (PEFT) pipe links to each other with supply terminals V+, and its source S links to each other with chip terminals Vout+, and its grid G links to each other with the positive pole of voltage stabilizing didoe; The negative pole of described voltage stabilizing didoe D links to each other 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 D.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 voltage stabilizing didoe D is generally selected IN5245.
Claims (4)
1. protective circuit that prevents the chip power reversal connection, it is characterized in that, comprise supply terminals V+ and V-, filter capacitor C1 and C2, P-channel field-effect transistor (PEFT) pipe Q, voltage stabilizing didoe D, current-limiting resistance R and chip terminals Vout-and Vout+, the negative pole of described voltage stabilizing didoe D links to each other 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 D.
2. as preventing the protective circuit of chip power reversal connection as described in the claim 1, it is characterized in that described supply terminals V+ links to each other with the positive and negative electrode of external power supply respectively by lead with V-.
3. as preventing the protective circuit of chip power reversal connection as described in the claim 1, it is characterized in that described filter capacitor C1 is connected on supply terminals V+ and V-two ends; Described filter capacitor C2 is connected supply terminals V-and chip terminals Vout+ two ends.
4. as preventing the protective circuit of chip power reversal connection as described in the claim 1; it is characterized in that; the drain D of described P-channel field-effect transistor (PEFT) pipe Q links to each other with supply terminals V+, and the source S of Q links to each other with chip terminals Vout+, and the grid G of Q links to each other with the positive pole of voltage stabilizing didoe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320119475 CN203151089U (en) | 2013-03-17 | 2013-03-17 | Protection circuit capable of preventing reverse connection of chip power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320119475 CN203151089U (en) | 2013-03-17 | 2013-03-17 | Protection circuit capable of preventing reverse connection of chip power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203151089U true CN203151089U (en) | 2013-08-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320119475 Expired - Fee Related CN203151089U (en) | 2013-03-17 | 2013-03-17 | Protection circuit capable of preventing reverse connection of chip power supply |
Country Status (1)
| Country | Link |
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| CN (1) | CN203151089U (en) |
Cited By (1)
| 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 |
-
2013
- 2013-03-17 CN CN 201320119475 patent/CN203151089U/en not_active Expired - Fee Related
Cited By (1)
| 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 |
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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: 20130821 Termination date: 20140317 |