CN208062790U - One kind being based on DC supply input reverse-connection preventing circuit - Google Patents
One kind being based on DC supply input reverse-connection preventing circuit Download PDFInfo
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- CN208062790U CN208062790U CN201820267384.7U CN201820267384U CN208062790U CN 208062790 U CN208062790 U CN 208062790U CN 201820267384 U CN201820267384 U CN 201820267384U CN 208062790 U CN208062790 U CN 208062790U
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- pmos tube
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Abstract
The utility model is related to one kind being based on DC supply input reverse-connection preventing circuit, including counnter attack connection control circuit and protection circuit；The counnter attack connection control circuit, is made of NPN triode and PMOS tube, and for controlling being turned on and off for DC supply input circuit, when DC supply input just connects, triode is opened, and control PMOS tube conducting, input current can pass through PMOS tube；When DC supply input reversal connection, triode is closed, while PMOS tube cannot play the role of anti-reverse by, input current by PMOS tube, and subsequent conditioning circuit is protected not to be damaged.The protection circuit; it is made of zener diode; for protecting PMOS tube not breakdown; when input direct-current voltage is higher than the breakdown reverse voltage of zener diode; zener diode enters working condition; by gate pmos source voltage clamping in safe operating voltage range, the effect for protecting PMOS tube not breakdown is played.
Description
Technical field
The utility model is related to DC supply inputs to protect field, more particularly to a kind of anti-reverse based on DC supply input
Circuit.
Background technology
With the development of New-energy electric vehicle, the application of optical fiber temperature measurement system is also more and more extensive.Optical fiber temperature measurement system
It is safe to use, have been to be concerned by more and more people.User in use by the input terminal of optical fiber temperature measurement system directly and power supply
It is connected, however for some users, it is easy to input terminal positive and negative anodes are reversed, and there are prodigious security risks.
Currently used DC supply input counnter attack connection device has：1, electromagnetic relay adds control circuit.It is correct in polarity
When electromagnetic relay power supply is connected.This structure can take into account efficiency and cost when input voltage is constant, but if input
Voltage change range is larger, and the control circuit needed will become complicated, leads to that of high cost, own efficiency is low.2, fusible link adds
Diode.Conducting makes power supply short circuit fusible link fuse when the reversal of diode.This unit efficiency is high, at low cost, but it is reversed after need more
Fusible link is changed, actual use is inconvenient.
Utility model content
In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a kind of efficient, stable, inexpensive, Neng Gouman
The DC supply input reverse-connection preventing circuit that sufficient optical fiber temperature measurement system requires.
The technical solution that the utility model solves above-mentioned technical problem is as follows：One kind being based on the anti-reverse electricity of DC supply input
Road, including counnter attack connection control circuit and protection circuit；
The counnter attack connection control circuit, is made of NPN triode and PMOS tube, for controlling leading for DC supply input
Logical and closing, when DC supply input just connects, the NPN triode is opened, and controls the PMOS tube conducting, input current energy
Pass through the PMOS tube；When DC supply input reversal connection, the NPN triode is closed, while the PMOS tube is not turned on, defeated
Entering electric current cannot play the role of anti-reverse by the PMOS tube, and subsequent conditioning circuit is protected not to be damaged.
The protection circuit, is made of zener diode, for protecting the PMOS tube not breakdown, works as input dc power
When pressure is higher than the breakdown reverse voltage of the zener diode, the zener diode enters working condition, by the PMOS tube
Gate source voltage U (gs) clampers play the effect for protecting the PMOS tube not breakdown in safe operating voltage range.
Wherein, the input voltage of the DC power supply is when just connecing, normally to power to subsequent conditioning circuit；The DC power supply
When input voltage is reversal connection, stop powering to subsequent conditioning circuit.
The utility model has the beneficial effects that：One kind of offer is based on DC supply input reverse-connection preventing circuit, works as direct current
When the input in source just connects, the input voltage of the DC power supply makes NPN triode described in reverse-connection preventing circuit be connected, and controls institute
State PMOS tube start-up operation；When the input voltage reverse connection of DC power supply, the input voltage of the DC power supply can not make described
NPN triode is opened, and the PMOS tube can not be connected, and power input circuit is cut off.Zener diode can make described
Gate source voltage U (gs) clampers of PMOS tube are in its range of safety operation so that reverse-connection preventing circuit being capable of reliable and stable work.With it is existing
There is technology to compare, the utility model embodiment prevents power supply power supply from starting when can control DC supply input reversal connection, and
Ensure to improve stability, reliability based on DC supply input reverse-connection preventing circuit under the premise of counnter attack connection function, reduce
Maintenance cost.
Description of the drawings
Fig. 1 is that the input voltage of the utility model DC power supply just connects circuit diagram；
Fig. 2 is the input voltage reverse connection circuit diagram of the utility model DC power supply.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The all other embodiment obtained, shall fall within the protection scope of the present invention.
The advantages of to make the utility model embodiment technical solution, is clearer, with reference to the accompanying drawings and examples to this reality
It is elaborated with new embodiment.
As depicted in figs. 1 and 2, a kind of to be based on DC supply input reverse-connection preventing circuit, including counnter attack connection control circuit and guarantor
Protection circuit；
The counnter attack connection control circuit, is made of NPN triode and PMOS tube, for controlling leading for DC supply input
Logical and closing, when DC supply input just connects, the NPN triode is opened, and controls the PMOS tube conducting, input current energy
Pass through the PMOS tube；When DC supply input reversal connection, the NPN triode is closed, while the PMOS tube is not turned on, defeated
Entering electric current cannot play the role of anti-reverse by the PMOS tube, and subsequent conditioning circuit is protected not to be damaged.
The protection circuit, is made of zener diode, for protecting the PMOS tube not breakdown, works as input dc power
When pressure is higher than the breakdown reverse voltage of zener diode, zener diode enters working condition, by the PMOS tube gate source voltage U
(gs) clamper plays the effect for protecting PMOS tube not breakdown in safe operating voltage range.
Wherein, the input voltage of the DC power supply is when just connecing, normally to power to subsequent conditioning circuit；The DC power supply
When input voltage is reversal connection, stop powering to subsequent conditioning circuit.
As shown in Figure 1, Q1 is PMOS tube, Q2 is NPN triode, and D1 is zener diode, and g is the grid of PMOS tube, and b is
NPN transistor base.
When the reverse-connection preventing circuit just connects, the NPN triode Q2 is opened, and controls PMOS tube Q1 conductings；Anti-reverse
When circuit reversal connection, the NPN triode Q2 can not be opened, and the PMOS tube Q1 is in not on-state.
Wherein, when DC supply input voltage just connects, the PMOS tube Q1 drain electrodes d is high potential, due to the PMOS
The presence of the parasitic diode of pipe Q1 so that the source electrode s of the PMOS tube Q1 is high potential, is used as pull-up resistor by R1 and makes
The grid g of the PMOS tube Q1 is high potential；And for the NPN triode Q2, when DC supply input just connects, base stage
B is high potential, and emitter e is low potential, and pressure difference reaches the NPN triode Q2 conductings after cut-in voltage, the NPN triode
Q2 collectors c becomes low potential, due to R3<<R1, therefore the grid g of the PMOS tube Q1 is pulled low by high potential as low potential, is made
It obtains electric potential relation and meets U (gs)<0, meet the condition of the PMOS tube Q1 conductings, the PMOS tube Q1 conductings, the positive normal open of electric current
It crosses the PMOS tube Q1 and reaches output end formation closed circuit.Wherein zener diode D1 protects the PMOS tube Q1 not hit
It wears, when input voltage is higher than the breakdown reverse voltage of the zener diode D1, the zener diode D1 enters work shape
It is not breakdown to play the protection PMOS tube Q1 by the PMOS tube Q1 gate source voltages clamper in safe operating voltage range for state
Effect, improve stability and reliability based on DC supply input reverse-connection preventing circuit.
As shown in Fig. 2, when DC supply input electric voltage reverse-connection, the PMOS tube Q1 drain electrodes d is low potential, anti-reverse
The parasitic diode of PMOS tube can not be connected；And for NPN triode Q2, when DC supply input reversal connection, base stage b is
Low potential, emitter e are high potential, cannot be satisfied the condition of the NPN triode Q2 conductings, and the NPN triode Q2 is not led
It is logical, therefore the grid g current potentials of the PMOS tube Q1 are identical as the current potential of the poles s so that grid source electrode pressure difference is unsatisfactory for the PMOS tube Q1
The condition U (gs) of conducting<0, therefore the PMOS tube Q1 is in not on-state, electric current can not be real by the PMOS tube Q1
Prevent power supply power supply from starting when now controlling DC supply input reversal connection.
Above description is only a specific implementation of the present invention, but the scope of protection of the utility model is not limited to
In this, any one skilled in the art within the technical scope disclosed by the utility model, the change that can be readily occurred in
Change or replace, should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model should be with power
Subject to the protection domain that profit requires.
Claims (2)
1. one kind being based on DC supply input reverse-connection preventing circuit, it is characterised in that：Including counnter attack connection control circuit and protection circuit；
The counnter attack connection control circuit, is made of NPN triode and PMOS tube, for control DC supply input conducting and
It closes, when DC supply input just connects, the NPN triode is opened, and controls the PMOS tube conducting, and input current can pass through
The PMOS tube；When DC supply input reversal connection, the NPN triode is closed, while the PMOS tube is not turned on, input electricity
Stream cannot play the role of anti-reverse by the PMOS tube, and subsequent conditioning circuit is protected not to be damaged；
The protection circuit, is made of zener diode, for protecting the PMOS tube not breakdown, when input direct-current voltage is high
When the breakdown reverse voltage of zener diode, the zener diode enters working condition, by the PMOS tube gate source voltage
Clamper plays the effect for protecting the PMOS tube not breakdown in safe operating voltage range.
2. according to claim 1 a kind of based on DC supply input reverse-connection preventing circuit, it is characterised in that：The direct current
The input voltage in source is when just connecing, normally to power to subsequent conditioning circuit；The input voltage of the DC power supply be reversal connection when, stop to
Subsequent conditioning circuit is powered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820267384.7U CN208062790U (en) | 2018-02-24 | 2018-02-24 | One kind being based on DC supply input reverse-connection preventing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820267384.7U CN208062790U (en) | 2018-02-24 | 2018-02-24 | One kind being based on DC supply input reverse-connection preventing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208062790U true CN208062790U (en) | 2018-11-06 |
Family
ID=63990604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820267384.7U Active CN208062790U (en) | 2018-02-24 | 2018-02-24 | One kind being based on DC supply input reverse-connection preventing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208062790U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217242A (en) * | 2018-11-08 | 2019-01-15 | 上海艾为电子技术股份有限公司 | A kind of power-switching circuit with counnter attack connection function, integrated circuit |
| CN110481466A (en) * | 2019-08-26 | 2019-11-22 | 上海灏境汽车检测技术有限公司 | The vehicle-mounted power supply circuit of anti-electric transient conduction |
-
2018
- 2018-02-24 CN CN201820267384.7U patent/CN208062790U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217242A (en) * | 2018-11-08 | 2019-01-15 | 上海艾为电子技术股份有限公司 | A kind of power-switching circuit with counnter attack connection function, integrated circuit |
| CN109217242B (en) * | 2018-11-08 | 2024-01-30 | 上海艾为电子技术股份有限公司 | Power supply conversion circuit with reverse connection preventing function and integrated circuit |
| CN110481466A (en) * | 2019-08-26 | 2019-11-22 | 上海灏境汽车检测技术有限公司 | The vehicle-mounted power supply circuit of anti-electric transient conduction |
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