CN204651920U - A kind of reverse-connection preventing circuit - Google Patents
A kind of reverse-connection preventing circuit Download PDFInfo
- Publication number
- CN204651920U CN204651920U CN201520214923.7U CN201520214923U CN204651920U CN 204651920 U CN204651920 U CN 204651920U CN 201520214923 U CN201520214923 U CN 201520214923U CN 204651920 U CN204651920 U CN 204651920U
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- Prior art keywords
- cmos tube
- diode
- negative pole
- reverse
- connection preventing
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Abstract
The utility model discloses a kind of reverse-connection preventing circuit, comprise diode D1, K switch 1, resistance R1 and CMOS tube T1; Described resistance R1 one end is connecting valve K1, power supply VCC, input positive pole and output cathode respectively; Described CMOS tube T1 source electrode and drain electrode are connected input negative pole lotus output negative pole respectively; The described resistance R1 other end connects CMOS tube T1 grid; Described diode D1 positive pole connecting valve K1, negative pole connects input negative pole.The utility model is low in energy consumption when CMOS tube normally uses, and when CMOS tube is inoperative, diode plays on-off action, and as on-off circuit for subsequent use, simple and practical, cost is low, handled easily.
Description
Technical field
The utility model relates to circuit field, is specifically related to a kind of reverse-connection preventing circuit.
Background technology
At present,
dC power supply input reverse connection prevention protection circuit utilizes the unilateral conduction of diode to realize anti-reverse protection under normal circumstances.This connection is simple and reliable, but power consumption impact is very large when input big current.Reach 2A with input current rated value, as selected the fast recovery diode MUR3020PT of Onsemi, rated pipe pressure drop is 0.7V, and so power consumption at least also will reach: Pd=2A × 0.7V=1.4W, and such efficiency is low, and caloric value is large, add radiator.Can also do rectification with diode bridge to input in addition, such circuit just has correct polarity forever.The shortcoming of these schemes is, the pressure drop on diode can consumed energy.
Summary of the invention
The utility model, for the problems referred to above, provides a kind of reverse-connection preventing circuit, comprises diode D1, K switch 1, resistance R1 and CMOS tube T1; Described resistance R1 one end is connecting valve K1, power supply VCC, input positive pole and output cathode respectively; Described CMOS tube T1 source electrode and drain electrode are connected input negative pole lotus output negative pole respectively; The described resistance R1 other end connects CMOS tube T1 grid; Described diode D1 positive pole connecting valve K1, negative pole connects input negative pole.
Further, described diode D1 has been the diode D1 of the effect of being turned on or off.
Further, described CMOS tube T1 has been the CMOS tube T1 of the effect of being turned on or off.
Further, described diode D1 is in order to the diode D1 when CMOS tube T1 damage maybe can not play on-off action in order to break-make.
Further, described K switch 1 is push-button switch.
Advantage of the present utility model:
The utility model is low in energy consumption when CMOS tube normally uses, and when CMOS tube is inoperative, diode plays on-off action, and as on-off circuit for subsequent use, ensure that circuit reliably uses, simple and practical, cost is low, handled easily.
Except object described above, feature and advantage, the utility model also has other object, feature and advantage.Below with reference to figure, the utility model is described in further detail.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.
Fig. 1 is schematic diagram of the present utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
With reference to figure 1, a kind of reverse-connection preventing circuit as shown in Figure 1, comprises diode D1, K switch 1, resistance R1 and CMOS tube T1; Described resistance R1 one end is connecting valve K1, power supply VCC, input positive pole and output cathode respectively; Described CMOS tube T1 source electrode and drain electrode are connected input negative pole lotus output negative pole respectively; The described resistance R1 other end connects CMOS tube T1 grid; Described diode D1 positive pole connecting valve K1, negative pole connects input negative pole.
Described diode D1 has been the diode D1 of the effect of being turned on or off.
Described CMOS tube T1 has been the CMOS tube T1 of the effect of being turned on or off.
Described diode D1 is in order to the diode D1 when CMOS tube T1 damage maybe can not play on-off action in order to break-make.
Described K switch 1 is push-button switch.
CMOS tube plays on-off action under normal circumstances, and close a switch when CMOS tube is inoperative K1, and diode plays on-off action.
Utilize the switching characteristic of metal-oxide-semiconductor, the conducting of control circuit and disconnect and design reverse connection prevention protection circuit, because the internal resistance of power MOS pipe is very little, solve the pressure drop that adopts the anti-reverse scheme of diode power source to exist and the excessive problem of power consumption.Set up diode stand-by circuit, in turn ensure that diode plays on-off action when CMOS tube is inoperative.
The utility model is low in energy consumption when CMOS tube normally uses, and when CMOS tube is inoperative, diode plays on-off action, and as on-off circuit for subsequent use, ensure that circuit reliably uses, simple and practical, cost is low, handled easily.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model,
All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (5)
1. a reverse-connection preventing circuit, is characterized in that, comprises diode D1, K switch 1, resistance R1 and CMOS tube T1; Described resistance R1 one end is connecting valve K1, power supply VCC, input positive pole and output cathode respectively; Described CMOS tube T1 source electrode and drain electrode are connected input negative pole lotus output negative pole respectively; The described resistance R1 other end connects CMOS tube T1 grid; Described diode D1 positive pole connecting valve K1, negative pole connects input negative pole.
2. reverse-connection preventing circuit according to claim 1, is characterized in that, described diode D1 has been the diode D1 of the effect of being turned on or off.
3. reverse-connection preventing circuit according to claim 1, is characterized in that, described CMOS tube T1 has been the CMOS tube T1 of the effect of being turned on or off.
4. reverse-connection preventing circuit according to claim 1, is characterized in that, described diode D1 is in order to the diode D1 when CMOS tube T1 damage maybe can not play on-off action in order to break-make.
5., according to the arbitrary described reverse-connection preventing circuit of claim 1-4, it is characterized in that, described K switch 1 is push-button switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520214923.7U CN204651920U (en) | 2015-04-12 | 2015-04-12 | A kind of reverse-connection preventing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520214923.7U CN204651920U (en) | 2015-04-12 | 2015-04-12 | A kind of reverse-connection preventing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204651920U true CN204651920U (en) | 2015-09-16 |
Family
ID=54104629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520214923.7U Expired - Fee Related CN204651920U (en) | 2015-04-12 | 2015-04-12 | A kind of reverse-connection preventing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204651920U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486968A (en) * | 2015-10-26 | 2016-04-13 | 常州大学 | DC input power reverse connection prevention device |
-
2015
- 2015-04-12 CN CN201520214923.7U patent/CN204651920U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486968A (en) * | 2015-10-26 | 2016-04-13 | 常州大学 | DC input power reverse connection prevention device |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150916 Termination date: 20160412 |