CN203423486U - Reverse connection prevention circuit for power supply - Google Patents
Reverse connection prevention circuit for power supply Download PDFInfo
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- CN203423486U CN203423486U CN201320523609.8U CN201320523609U CN203423486U CN 203423486 U CN203423486 U CN 203423486U CN 201320523609 U CN201320523609 U CN 201320523609U CN 203423486 U CN203423486 U CN 203423486U
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- semiconductor
- oxide
- type metal
- power supply
- type mos
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Abstract
The utility model provides a reverse connection prevention circuit for a power supply, which is connected between the power supply and a load. The reverse connection prevention circuit comprises a resistor R1, a first P-type MOS (metal oxide semiconductor) transistor Q1, a second N-type MOS transistor Q2, a resistor R2, a resistor R3 and a light-emitting diode LED1, wherein the resistor R1 is connected between a positive electrode of the power supply and a negative electrode of the power supply, a source electrode of the first P-type MOS transistor Q1 is connected to the positive electrode of the power supply, a grid electrode of the first P-type MOS transistor Q1 is connected to the negative electrode of the power supply, a drain electrode of the first P-type MOS transistor Q1 is connected to a grid electrode of the second N-type MOS transistor Q2, the resistor R2 is connected between the grid electrode of the second N-type MOS transistor Q2 and a source electrode of the second N-type MOS transistor Q2, and a drain electrode of the second N-type MOS transistor Q2 is connected to the negative electrode of the power supply. The reverse connection prevention circuit for the power supply is simple in structure, high in stability and low in power consumption.
Description
Technical field
The utility model relates to power technique fields, refers to especially a kind of circuit for preventing reverse connection of power supply.
Background technology
In using the electronic equipment of external power supply, if the power supply of electronic equipment connects instead, can cause the permanent damage of electronic equipment.Existing circuit for preventing reverse connection of power supply adopts diode, utilizes the one-way conduction characteristic of diode to reach the object that prevents reverse power connection damage electronic equipment.But, because the pressure drop of diode is fixed, cause the power of its consumption excessive, produce heat, cause circuit stability to reduce.
Utility model content
The purpose of this utility model is that proposition is a kind of simple in structure, and stability is high, the circuit for preventing reverse connection of power supply that power consumption is less.
For achieving the above object, the utility model proposes a kind of circuit for preventing reverse connection of power supply, be connected between power supply and load, comprise: resistance R 1, the one P type metal-oxide-semiconductor Q1, the second N-type metal-oxide-semiconductor Q2, resistance R 2, resistance R 3, LED 1, wherein, described resistance R 1 is connected between positive source and power cathode, the source electrode of a described P type metal-oxide-semiconductor Q1 is connected to positive source, the grid of a described P type metal-oxide-semiconductor Q1 is connected to power cathode, the drain electrode of a described P type metal-oxide-semiconductor Q1 is connected to the grid of described the second N-type metal-oxide-semiconductor Q2, resistance R 2 is connected between the grid of described the second N-type metal-oxide-semiconductor Q2 and the source electrode of described the second N-type metal-oxide-semiconductor Q2, the drain electrode of described the second N-type metal-oxide-semiconductor Q2 is connected to power cathode, described load positive pole is connected to positive source, described load negative pole is connected to the source electrode of described the second N-type metal-oxide-semiconductor Q2, described resistance R 3 is connected between positive source and the positive pole of LED 1, and the negative pole of LED 1 is connected to the source electrode of the second N-type metal-oxide-semiconductor Q2.
Further, in above-mentioned circuit for preventing reverse connection of power supply, described load is LED lamp.
Further, in above-mentioned circuit for preventing reverse connection of power supply, described load is incandescent lamp bulb.
Circuit that the utility model provides is simple and reliable, stability is high, power consumption is less.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the utility model reverse-connection preventing circuit one embodiment.
Embodiment
Below in conjunction with accompanying drawing, describe preferred embodiment of the present utility model in detail.
Refer to Fig. 1, the utility model reverse-connection preventing circuit 100 comprises resistance R 1, a P type metal-oxide-semiconductor Q1, the second N-type metal-oxide-semiconductor Q2, resistance R 2, resistance R 3, LED 1.
Wherein, described resistance R 1 is connected between positive source and power cathode, the source electrode of a described P type metal-oxide-semiconductor Q1 is connected to positive source, the grid of a described P type metal-oxide-semiconductor Q1 is connected to power cathode, the drain electrode of a described P type metal-oxide-semiconductor Q1 is connected to the grid of described the second N-type metal-oxide-semiconductor Q2, resistance R 2 is connected between the grid of described the second N-type metal-oxide-semiconductor Q2 and the source electrode of described the second N-type metal-oxide-semiconductor Q2, and the drain electrode of described the second N-type metal-oxide-semiconductor Q2 is connected to power cathode; Load positive pole is connected to positive source, and load negative pole is connected to the source electrode of described the second N-type metal-oxide-semiconductor Q2.Described resistance R 3 is connected between positive source and the positive pole of LED 1, and the negative pole of LED 1 is connected to the source electrode of the second N-type metal-oxide-semiconductor Q2.
In the present embodiment, described load is LED lamp or incandescent lamp bulb.
When power supply normally accesses, the gate-source voltage of the one P type metal-oxide-semiconductor Q1 is for negative, the one P type metal-oxide-semiconductor Q2 conducting, in like manner, the gate-source voltage of the second N-type metal-oxide-semiconductor Q2 is for just, the second N-type metal-oxide-semiconductor Q2 conducting, the LED 1 that is connected to the second N-type metal-oxide-semiconductor Q2 source electrode has electric current to pass through, and LED 1 bright light prompting power supply normally accesses.
When reverse power connection, the gate-source voltage of the one P type metal-oxide-semiconductor Q1 is for just, the one P type metal-oxide-semiconductor Q1 cut-off, in like manner, the gate-source voltage of the second N-type metal-oxide-semiconductor Q2 is for negative, and the second N-type metal-oxide-semiconductor Q2 ends, LED 1 no current that is connected to the second N-type metal-oxide-semiconductor Q2 source electrode passes through, LED 1 is not luminous, in the state of turning off the light, and prompting reverse power connection.
The circuit for preventing reverse connection of power supply that the utility model provides makes when the reverse power connection by a P type metal-oxide-semiconductor Q1 and the second N-type metal-oxide-semiconductor Q2 are set, the polarity of the bigoted voltage of grid source electrode that offers a P type metal-oxide-semiconductor Q1 and the second N-type metal-oxide-semiconductor Q2 required bigoted voltage during with a P type metal-oxide-semiconductor Q1 and the second N-type metal-oxide-semiconductor Q2 conducting is contrary, cause a P type metal-oxide-semiconductor Q1 and the second N-type metal-oxide-semiconductor Q2 in cut-off state, the load no current that is connected to the source electrode of the second N-type metal-oxide-semiconductor Q2 passes through, power supply Non voltage output, reaches anti-reverse object.
To sum up, the utility model provides circuit is simple and reliable, stability is high, power consumption is less.
Here description of the present utility model and application is illustrative, not wants by scope restriction of the present utility model in the above-described embodiments.Here the distortion of disclosed embodiment and change is possible, and for those those of ordinary skill in the art, the various parts of the replacement of embodiment and equivalence are known.Those skilled in the art are noted that in the situation that not departing from spirit of the present utility model or substantive characteristics, and the utility model can be with other form, structure, layout, ratio, and realizes with other assembly, material and parts.In the situation that not departing from the utility model scope and spirit, can carry out other distortion and change to disclosed embodiment here.
Claims (3)
1. a circuit for preventing reverse connection of power supply, be connected between power supply and load, it is characterized in that, comprise: resistance R 1, the one P type metal-oxide-semiconductor Q1, the second N-type metal-oxide-semiconductor Q2, resistance R 2, resistance R 3, LED 1, wherein, described resistance R 1 is connected between positive source and power cathode, the source electrode of a described P type metal-oxide-semiconductor Q1 is connected to positive source, the grid of a described P type metal-oxide-semiconductor Q1 is connected to power cathode, the drain electrode of a described P type metal-oxide-semiconductor Q1 is connected to the grid of described the second N-type metal-oxide-semiconductor Q2, resistance R 2 is connected between the grid of described the second N-type metal-oxide-semiconductor Q2 and the source electrode of described the second N-type metal-oxide-semiconductor Q2, the drain electrode of described the second N-type metal-oxide-semiconductor Q2 is connected to power cathode, described load positive pole is connected to positive source, described load negative pole is connected to the source electrode of described the second N-type metal-oxide-semiconductor Q2, described resistance R 3 is connected between positive source and the positive pole of LED 1, and the negative pole of LED 1 is connected to the source electrode of the second N-type metal-oxide-semiconductor Q2.
2. circuit for preventing reverse connection of power supply as claimed in claim 1, is characterized in that, described load is LED lamp.
3. circuit for preventing reverse connection of power supply as claimed in claim 1, is characterized in that, described load is incandescent lamp bulb.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320523609.8U CN203423486U (en) | 2013-08-26 | 2013-08-26 | Reverse connection prevention circuit for power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320523609.8U CN203423486U (en) | 2013-08-26 | 2013-08-26 | Reverse connection prevention circuit for power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203423486U true CN203423486U (en) | 2014-02-05 |
Family
ID=50022575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320523609.8U Expired - Fee Related CN203423486U (en) | 2013-08-26 | 2013-08-26 | Reverse connection prevention circuit for power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203423486U (en) |
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2013
- 2013-08-26 CN CN201320523609.8U patent/CN203423486U/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: 20140205 Termination date: 20140826 |
|
| EXPY | Termination of patent right or utility model |