CN102931637A - Power source protection circuit of vehicle-mounted electronic component - Google Patents
Power source protection circuit of vehicle-mounted electronic component Download PDFInfo
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- CN102931637A CN102931637A CN2011102288645A CN201110228864A CN102931637A CN 102931637 A CN102931637 A CN 102931637A CN 2011102288645 A CN2011102288645 A CN 2011102288645A CN 201110228864 A CN201110228864 A CN 201110228864A CN 102931637 A CN102931637 A CN 102931637A
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Abstract
The invention discloses a power source protection circuit of a vehicle-mounted electronic component. The power source protection circuit of the vehicle-mounted electronic component comprises an electronic switch 1, an electronic switch 2, resistors R1, R2 and R3, and a stabilivolt D1; an external power source is connected with one end of the resistor R1, the input end of the electronic switch 1 and the input end of the electronic switch 2; the other end of the resistor R1 is connected with the negative electrode of the stabilivolt D1 and the control end of the electronic switch 2; the positive electrode of the stabilivolt D1 is grounded; one end of the resistor R2 is connected with the control end of the electronic switch 1 and the other end of the resistor R2 is connected with the output end of the electronic switch 2 and one end of the resistor R3; the other end of the resistor R3 is grounded; and the output end of the electronic switch 1 is connected with an internal power source. The power source protection circuit of the vehicle-mounted electronic component is simple in structure and low in manufacturing cost, and power source of the vehicle-mounted electronic component can be protected.
Description
Technical field
The present invention relates to a kind of power protecting circuit, particularly relate to a kind of power protecting circuit of vehicle electronics parts.
Background technology
The vehicle electronics parts comprise vehicle electronics control module and onboard sensor, and the power protection of existing vehicle electronics parts mainly contains following dual mode:
1. in input circuit, be provided with integrated circuit; chip internal is integrated with short-circuit protection function; the limitation of this kind protected mode is that the short-circuit protection ability of chip is subjected to the restriction of chip design; can't satisfy the requirement of application in a lot of situations, and this kind power protection mode can not realize the protection for reverse power connection.
2. power protecting circuit adopts discrete device to build; can realize a certain function in power supply short circuit, shorted to earth or the reverse power connection or the protection of several functions; its shortcoming of protected mode is to have used in the circuit electronic devices such as diode, triode, MOSFET (metal oxide layer semiconductor field-effect transistor), comparator, trigger hereinto; discrete device is many; control logic is complicated, and manufacturing cost is high.
As shown in Figure 1, a kind of existing Vehicular power protective circuit comprises: resistance, amplifier, short-circuit protection circuit (comprising a plurality of electronic components), electric current efferent duct; this power protecting circuit can only be realized the protection of power supply short circuit; complex structure, function singleness, manufacturing cost is high.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of power protecting circuit of vehicle electronics parts, and it is simple in structure, can reduce manufacturing cost, can realize the power protection to the vehicle electronics parts.
For solving the problems of the technologies described above, power protecting circuit of the present invention comprises:
Electronic switch 1, electronic switch 2, resistance R 1, R2, R3, voltage-stabiliser tube D1;
The input of the end of external power source connecting resistance R1, the input of electronic switch 1 and electronic switch 2;
The negative pole of another termination voltage-stabiliser tube D1 of resistance R 1 and the control end of electronic switch 2;
The plus earth of voltage-stabiliser tube D1;
The control end of one end connecting electronic switch 1 of resistance R 2, the output of its other end connecting electronic switch 2 and the end of electronics R3, the other end ground connection of resistance R 3;
The output termination internal electric source of electronic switch 1.
Described electronic switch 1 is the PNP triode, and its collector electrode is as the input of electronic switch 1, and its base stage is as the control end of electronic switch 1, and its emitter is as the output of electronic switch 1.
Described electronic switch 2 is the PNP triode, and its collector electrode is as the input of electronic switch 2, and its base stage is as the control end of electronic switch 2, and its emitter is as the output of electronic switch 2.
Described electronic switch 1 is the PMOS pipe, and its source electrode is as the input of electronic switch 1, and its grid is as the control end of electronic switch 1, and its drain electrode is as the output of electronic switch 1.
Described electronic switch 2 is the PMOS pipe, and its source electrode is as the input of electronic switch 2, and its grid is as the control end of electronic switch 2, and its drain electrode is as the output of electronic switch 2.
The power protecting circuit of vehicle electronics parts of the present invention can be realized the protection to power supply short circuit, shorted to earth and reverse power connection, the protection when wherein the protection of power supply short circuit being mainly used in the onboard sensor power supply to the battery supply short circuit; The protective circuit of shorted to earth and reverse power connection can be applied to all vehicle electronics parts.
Power protecting circuit of the present invention adopts simple circuit structure can realize the power protection of vehicle electronics parts, has reduced manufacturing cost.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and embodiment:
Fig. 1 is a kind of existing Vehicular power protective circuit.
Fig. 2 electrical block diagram of the present invention.
Fig. 3 is the electrical block diagram of one embodiment of the invention.
Description of reference numerals
R1, R2, R3 are resistance
D1 is voltage-stabiliser tube
M1 is the POMS pipe
Q1 is the PNP triode
A is the input of electronic switch 1
B is the output of electronic switch 1
C is the control end of electronic switch 1
D is the input of electronic switch 2
E is the control end of electronic switch 2
F is the output of electronic switch 2
V_OUT is external power source
V_IN is internal electric source
Embodiment
As shown in Figure 2, power protecting circuit of the present invention comprises:
Electronic switch 1, electronic switch 2, resistance R 1, R2, R3, voltage-stabiliser tube D1;
The end of external power source V_OUT connecting resistance R1, the input A of electronic switch 1 and the input D of electronic switch 2;
The negative pole of another termination voltage-stabiliser tube D1 of resistance R 1 and the control end E of electronic switch 2;
The plus earth of voltage-stabiliser tube D1;
The control end C of one end connecting electronic switch 1 of resistance R 2, the output F of its other end connecting electronic switch 2 and the end of electronics R3, the other end ground connection of resistance R 3;
The output B of electronic switch 1 meets internal electric source V_IN.
Voltage-stabiliser tube D1 detectable voltage signals is set when requiring when voltage signal reaches, and electronic switch 2 conductings change the control end voltage of electronic switch 1, and then are disconnected, thereby transducer is not powered when short circuit occurs; When fault disappears, can recover normal operation.
As shown in Figure 3, in one embodiment of the invention, comprising:
PMOS manages M1, PNP triode Q1, resistance R 1, R2, R3, voltage stabilizing didoe D1;
The source electrode of the end of external power source V_OUT connecting resistance R1, PMOS pipe M1 and the collector electrode of PNP triode Q1;
The negative pole of another termination voltage stabilizing didoe D1 of resistance R 1 and the base stage of PNP triode Q1;
The plus earth of voltage stabilizing didoe D1;
One end of resistance R 2 connects the grid of PMOS pipe M1, and its other end connects the emitter of PNP triode Q1 and the end of electronics R3, the other end ground connection of resistance R 3;
The drain electrode of PMOS pipe M1 meets internal electric source V_IN.
When the power protecting circuit of the present embodiment is worked:
When the external power source input voltage was normal, the clamped voltage of voltage-stabiliser tube two utmost point D1 was greater than the external power source input voltage, and this moment, voltage-stabiliser tube two utmost point D1 did not work, and resistance R 1 both end voltage reduces to 0, and voltage is the external power source input voltage; Not conducting of PNP triode Q1 work, resistance R 3 both end voltage reduce to 0, and voltage is 0V; This moment, the gate-source voltage of PMOS pipe M1 was the external power source input voltage, PMOS pipe M1 conducting, and the external power source input voltage is identical with the internal electric source output voltage, power supply normal operation this moment.
On external power source input and the car during battery short circuit, voltage stabilizing didoe D1 work, this moment, the voltage at resistance R 1 two ends was the difference of external power source input voltage and voltage stabilizing didoe D1 voltage, and voltage difference is greater than the cut-in voltage of PNP triode Q1, and PNP triode Q1 opens work; After the PNP triode Q1 unlatching work, resistance R 3 one terminal voltages are 0, and other end voltage is the external power source input voltage, and this moment, the gate-source voltage of PMOS pipe M1 was 0V, the PMOS pipe M1 work that is under an embargo, and this moment, power supply was disconnected.
When external power source input voltage and ground short circuit, the gate-source voltage of PMOS pipe M1 is 0V, the PMOS pipe M1 work that is under an embargo, and this moment, power supply was disconnected.
When external power source input and ground reversal connection, PNP triode Q1 can't open work, and the collector electrode of PNP triode Q1 and the voltage between the emitter-base bandgap grading are negative external power source input voltage, and this voltage PMOS pipe M1 can't open work, and power supply is disconnected at this moment.
Below through the specific embodiment and the embodiment the present invention is had been described in detail, but these are not to be construed as limiting the invention.In the situation that do not break away from the principle of the invention, those skilled in the art also can make many distortion and improvement, and these also should be considered as protection scope of the present invention.
Claims (5)
1. the power protecting circuit of vehicle electronics parts is characterized in that, comprising:
Electronic switch 1, electronic switch 2, resistance R 1, R2, R3, voltage-stabiliser tube D1;
The input of the end of external power source connecting resistance R1, the input of electronic switch 1 and electronic switch 2;
The negative pole of another termination voltage-stabiliser tube D1 of resistance R 1 and the control end of electronic switch 2;
The plus earth of voltage-stabiliser tube D1;
The control end of one end connecting electronic switch 1 of resistance R 2, the output of its other end connecting electronic switch 2 and the end of electronics R3, the other end ground connection of resistance R 3;
The output of electronic switch 1 connects internal electric source.
2. power protecting circuit as claimed in claim 1 is characterized in that: described electronic switch 1 is the PNP triode, and its collector electrode is as the input of electronic switch 1, and its base stage is as the control end of electronic switch 1, and its emitter is as the output of electronic switch 1.
3. power protecting circuit as claimed in claim 1 is characterized in that: described electronic switch 2 is the PNP triode, and its collector electrode is as the input of electronic switch 2, and its base stage is as the control end of electronic switch 2, and its emitter is as the output of electronic switch 2.
4. power protecting circuit as claimed in claim 1 is characterized in that: described electronic switch 1 is the PMOS pipe, and its source electrode is as the input of electronic switch 1, and its grid is as the control end of electronic switch 1, and its drain electrode is as the output of electronic switch 1.
5. power protecting circuit as claimed in claim 1 is characterized in that: described electronic switch 2 is the PMOS pipe, and its source electrode is as the input of electronic switch 2, and its grid is as the control end of electronic switch 2, and its drain electrode is as the output of electronic switch 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102288645A CN102931637A (en) | 2011-08-10 | 2011-08-10 | Power source protection circuit of vehicle-mounted electronic component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102288645A CN102931637A (en) | 2011-08-10 | 2011-08-10 | Power source protection circuit of vehicle-mounted electronic component |
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| Publication Number | Publication Date |
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| CN102931637A true CN102931637A (en) | 2013-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102288645A Pending CN102931637A (en) | 2011-08-10 | 2011-08-10 | Power source protection circuit of vehicle-mounted electronic component |
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| CN (1) | CN102931637A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452063A (en) * | 2016-10-27 | 2017-02-22 | 江苏吉泰科电气股份有限公司 | Power source control circuit of automobile inverter |
| CN109756113A (en) * | 2017-11-03 | 2019-05-14 | 厦门雅迅网络股份有限公司 | Antistatic protection with over the ground or the multistate switch and implementation method of power source short-circuit protection |
| CN112055923A (en) * | 2018-05-15 | 2020-12-08 | 大陆-特韦斯贸易合伙股份公司及两合公司 | Circuit arrangement for protecting electronic components |
| CN112968223A (en) * | 2013-12-06 | 2021-06-15 | 深圳市大疆创新科技有限公司 | Power pack and unmanned vehicles |
| US11607972B2 (en) | 2013-12-06 | 2023-03-21 | SZ DJI Technology Co., Ltd. | Battery and unmanned aerial vehicle with battery indicator and venting opening |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5890780A (en) * | 1996-10-07 | 1999-04-06 | Nec Corporation | Power supply switching apparatus with protection function for supplying power to an electronic circuit via an external power source or an internal power supply source |
| CN101309005A (en) * | 2007-05-18 | 2008-11-19 | 上海大潮电子技术有限公司 | Electric transient anti-surge circuit in vehicle electronic equipment |
| 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 |
| CN102035169A (en) * | 2009-09-28 | 2011-04-27 | 研祥智能科技股份有限公司 | Input overvoltage protection circuit and DC-DC power supply conversion device |
-
2011
- 2011-08-10 CN CN2011102288645A patent/CN102931637A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5890780A (en) * | 1996-10-07 | 1999-04-06 | Nec Corporation | Power supply switching apparatus with protection function for supplying power to an electronic circuit via an external power source or an internal power supply source |
| CN101309005A (en) * | 2007-05-18 | 2008-11-19 | 上海大潮电子技术有限公司 | Electric transient anti-surge circuit in vehicle electronic equipment |
| CN102035169A (en) * | 2009-09-28 | 2011-04-27 | 研祥智能科技股份有限公司 | Input overvoltage protection circuit and DC-DC power supply conversion device |
| 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 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112968223A (en) * | 2013-12-06 | 2021-06-15 | 深圳市大疆创新科技有限公司 | Power pack and unmanned vehicles |
| US11607972B2 (en) | 2013-12-06 | 2023-03-21 | SZ DJI Technology Co., Ltd. | Battery and unmanned aerial vehicle with battery indicator and venting opening |
| CN112968223B (en) * | 2013-12-06 | 2024-03-08 | 深圳市大疆创新科技有限公司 | Power pack and unmanned aerial vehicle |
| CN106452063A (en) * | 2016-10-27 | 2017-02-22 | 江苏吉泰科电气股份有限公司 | Power source control circuit of automobile inverter |
| CN109756113A (en) * | 2017-11-03 | 2019-05-14 | 厦门雅迅网络股份有限公司 | Antistatic protection with over the ground or the multistate switch and implementation method of power source short-circuit protection |
| CN112055923A (en) * | 2018-05-15 | 2020-12-08 | 大陆-特韦斯贸易合伙股份公司及两合公司 | Circuit arrangement for protecting electronic components |
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Application publication date: 20130213 |