CN201252402Y - Protective circuit for preventing reverse connection of power supply - Google Patents
Protective circuit for preventing reverse connection of power supply Download PDFInfo
- Publication number
- CN201252402Y CN201252402Y CNU2008200882647U CN200820088264U CN201252402Y CN 201252402 Y CN201252402 Y CN 201252402Y CN U2008200882647 U CNU2008200882647 U CN U2008200882647U CN 200820088264 U CN200820088264 U CN 200820088264U CN 201252402 Y CN201252402 Y CN 201252402Y
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- negative
- power supply
- field effect
- positive
- receiving terminal
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Abstract
The utility mode relates to a protective circuit for preventing reverse connection of power supply, in particular to a protective circuit which prevents reverse connection of a power supply through utilizing a field effect tube. The protective circuit for preventing reverse connection of power supply comprises a positive receiving terminal and a negative receiving terminal, wherein the positive receiving terminal is connected with a positive source pole of a device through a wire, and the negative receiving terminal is connected with a negative source pole of the device through a wire, and a field effect tube is arranged on the wire for connecting the negative receiving terminal and the negative source pole, and the source pole of the field effect tube is connected with the negative receiving terminal, a drain pole of the field effect tube is connected with the negative source pole of the device, and a grid electrode of the field effect tube is connected with the positive receiving terminal through a series current-limiting resistance. The protective circuit for preventing reverse connection of power supply can protect various electronic devices electrified by a direct current power supply from being damaged because of the reverse connection of a power supply, reduces possible economic loss during use, and solves the problems of economic loss and the like caused by damaging devices when a user is carelessness to connect an anode and a cathode of an electric device electrified by an existing direct current power supply in opposition.
Description
Technical field
The utility model relates to a kind of anti-power supply reverse-connection protection circuit, particularly a kind of protective circuit of utilizing field effect transistor to realize anti-power supply reversal connection.
Technical background
Generally when making various electronic equipment, if input is a direct current, may will produce such situation, the user connects positive-negative polarity instead because of carelessness, then may cause device damage, thereby causes economic loss.
Summary of the invention
The utility model purpose is to provide a kind of various electronic equipments of DC power supply of protecting not to be subjected to cause damage because of the power supply reversal connection; to reduce the anti-power supply reverse-connection protection circuit of economic loss possible in the use; the user who has solved the electronic equipment existence of existing DC power supply connects positive-negative polarity instead because of carelessness; then may cause device damage, thereby cause problems such as economic loss.
Above-mentioned technical purpose of the present utility model mainly solves by the following technical programs: it comprises positive terminals and negative terminals, positive terminals are connected with the positive source electrode of equipment by lead, negative terminals are connected with the negative source electrode of equipment by lead, the lead of negative terminals of described connection and negative source electrode is provided with field effect transistor, the source electrode of described field effect transistor is connected with negative terminals, the drain electrode of field effect transistor is connected with the negative source electrode of equipment, and the grid of field effect transistor is connected with positive terminals by the current-limiting resistance of a polyphone.Between negative terminals and the negative source electrode of equipment, use a field effect transistor to constitute a controlled circuit, when normal wiring, positive terminals V+ and negative terminals V-connect positive source and negative pole respectively, positive voltage is added in the grid of field effect transistor after current-limiting resistance R1 current limliting, make its conducting, the conducting internal resistance of field effect transistor is little, approximate short circuit, output just can operate as normal, if polarity is connect instead because of carelessness, power cathode has been received positive terminals V+, and positive source has been received negative terminals V-, just equals to have added negative voltage to field effect transistor Q1 grid, field effect transistor is ended, electric current does not have the loop, causes damage for the circuitry of back with regard to having avoided, to reduce the economic loss that may cause.
As preferably, be parallel with capacitor C 2, diode D1 and resistance R 2 between the negative source electrode of the grid of described field effect transistor and equipment, wherein, the positive pole of diode D1 is connected with the negative source electrode of equipment, and the negative pole of diode D1 is connected with the grid of field effect transistor.
Therefore, the utlity model has the various electronic equipments that to protect DC power supply and be not subjected to, to reduce possible characteristics such as economic loss in the use because of the power supply reversal connection causes damage.
Description of drawings
Fig. 1 is a kind of structural representation of the present utility model.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment 1: as shown in Figure 1, comprise positive terminals V+ and negative terminals V-, positive terminals V+ is connected with the positive source electrode Vout+ of equipment by lead, negative terminals V-is connected with the negative source electrode Vout-of equipment by lead, the lead that connects negative terminals V-and negative source electrode Vout-is provided with field effect transistor Q1, the source electrode of field effect transistor Q1 is connected with negative terminals V-, the drain electrode of field effect transistor Q1 is connected with the negative source electrode Vout-of equipment, the grid of field effect transistor Q1 is connected with positive terminals V+ by the current-limiting resistance R1 of a polyphone, be parallel with capacitor C 2 between the negative source electrode of the grid of field effect transistor and equipment, diode D1 and resistance R 2, wherein, the positive pole of diode D1 is connected with the negative source electrode of equipment, and the negative pole of diode D1 is connected with the grid of field effect transistor.Between negative terminals V-and the negative source electrode Vout-of equipment, use a field effect transistor Q1 to constitute a controlled circuit, when normal wiring, positive terminals V+ and negative terminals V-connect positive source and negative pole respectively, positive voltage is added in the grid of field effect transistor after current-limiting resistance R1 current limliting, make its conducting, the conducting internal resistance of field effect transistor is little, approximate short circuit, output just can operate as normal, if polarity is connect instead because of carelessness, power cathode has been received positive terminals V+, positive source has been received negative terminals V-, equals to have added negative voltage to field effect transistor Q1 grid, and field effect transistor is ended, electric current does not have the loop, causes damage for the circuitry of back with regard to having avoided.
Claims (2)
1, a kind of anti-power supply reverse-connection protection circuit; comprise positive terminals and negative terminals; positive terminals are connected with the positive source electrode of equipment by lead; negative terminals are connected with the negative source electrode of equipment by lead; the lead that it is characterized in that negative terminals of described connection and negative source electrode is provided with field effect transistor; the source electrode of described field effect transistor is connected with negative terminals, and the drain electrode of field effect transistor is connected with the negative source electrode of equipment, and the grid of field effect transistor is connected with positive terminals by the current-limiting resistance of a polyphone.
2, anti-power supply reverse-connection protection circuit according to claim 1; it is characterized in that being parallel with capacitor C 2, diode D1 and resistance R 2 between the negative source electrode of the grid of described field effect transistor and equipment; wherein; the positive pole of diode D1 is connected with the negative source electrode of equipment, and the negative pole of diode D1 is connected with the grid of field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200882647U CN201252402Y (en) | 2008-06-10 | 2008-06-10 | Protective circuit for preventing reverse connection of power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200882647U CN201252402Y (en) | 2008-06-10 | 2008-06-10 | Protective circuit for preventing reverse connection of power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201252402Y true CN201252402Y (en) | 2009-06-03 |
Family
ID=40748065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200882647U Expired - Fee Related CN201252402Y (en) | 2008-06-10 | 2008-06-10 | Protective circuit for preventing reverse connection of power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201252402Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872971A (en) * | 2010-07-02 | 2010-10-27 | 北京星网锐捷网络技术有限公司 | Reverse-connection preventing circuit, reverse-connection preventing processing method and communication equipment |
| CN104426139A (en) * | 2013-08-30 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Anti-reverse battery charging protecting circuit |
| CN109873555A (en) * | 2019-03-28 | 2019-06-11 | 深圳市威拓思音乐有限公司 | A kind of pressure-stabilization filter of musical instrument |
-
2008
- 2008-06-10 CN CNU2008200882647U patent/CN201252402Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872971A (en) * | 2010-07-02 | 2010-10-27 | 北京星网锐捷网络技术有限公司 | Reverse-connection preventing circuit, reverse-connection preventing processing method and communication equipment |
| CN104426139A (en) * | 2013-08-30 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Anti-reverse battery charging protecting circuit |
| CN109873555A (en) * | 2019-03-28 | 2019-06-11 | 深圳市威拓思音乐有限公司 | A kind of pressure-stabilization filter of musical instrument |
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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: 20090603 Termination date: 20110610 |