CN106505516A - A kind of overvoltage crowbar and electronic control unit ECU output circuits - Google Patents
A kind of overvoltage crowbar and electronic control unit ECU output circuits Download PDFInfo
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- CN106505516A CN106505516A CN201611039508.8A CN201611039508A CN106505516A CN 106505516 A CN106505516 A CN 106505516A CN 201611039508 A CN201611039508 A CN 201611039508A CN 106505516 A CN106505516 A CN 106505516A
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- Prior art keywords
- npn triode
- voltage
- overvoltage crowbar
- triode
- stabiliser tube
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
Abstract
This application discloses a kind of overvoltage crowbar and electronic control unit ECU output circuits, for solving in prior art due to supplying electric power output voltage more than the maximum voltage that load can be carried, cause to load problem that is impaired or scrapping.In the overvoltage crowbar, supply power connector end mouth is connected with the negative pole of voltage-stabiliser tube, and the positive pole for supplying power connector end mouth with supply power supply is connected；The positive pole of voltage-stabiliser tube is grounded by first resistor, and the positive pole of voltage-stabiliser tube is connected to the base stage of the first NPN triode；The grounded emitter of the first NPN triode；The colelctor electrode of the first NPN triode is connected to GPIO connectivity ports, and the colelctor electrode of the first NPN triode is connected with the base stage of the second NPN triode；The grounded emitter of the second NPN triode；The colelctor electrode of the second NPN triode is connected to the base stage of PNP triode；The emitter stage of PNP triode is connected with supply power connector end mouth；The colelctor electrode of PNP triode is connected with output port.
Description
Technical field
The application is related to field of computer technology, more particularly to a kind of overvoltage crowbar and electronic control unit ECU
Output circuit.
Background technology
In actual applications, sometimes due to the voltage instability of supply power supply output, may result in and be carried in load
Voltage is excessive, phenomenon that is impaired or scrapping occurs so as to cause the load.
However, in prior art, there is no overvoltage crowbar, when the voltage of supply power supply output is more than load institute energy
During the maximum voltage of carrying so that power supply circuits open circuit, is no longer load supplying, and then protects load.
Content of the invention
The embodiment of the present application provides a kind of overvoltage crowbar and electronic control unit ECU output circuits, for solving
In prior art due to supplying electric power output voltage more than the maximum voltage that can carry of load, load is caused to be damaged or scrap
Problem.
The embodiment of the present application adopts following technical proposals：
A kind of overvoltage crowbar, the circuit include supplying power connector end mouth, universal input/output GPIO connection ends
Mouth, the first NPN triode, voltage-stabiliser tube, the second NPN triode, PNP triode, output port, wherein：
The supply power connector end mouth is connected with the negative pole of the voltage-stabiliser tube, wherein, the supply power connector end mouth
It is connected with the positive pole of supply power supply；
The positive pole of the voltage-stabiliser tube is grounded by the first resistor, and the positive pole of the voltage-stabiliser tube is connected to described
The base stage of one NPN triode；
The grounded emitter of first NPN triode；
The colelctor electrode of first NPN triode is connected to the GPIO connectivity ports, and first NPN triode
Colelctor electrode be connected with the base stage of second NPN triode；Wherein, the GPIO connectivity ports are connected with GPIO；
The grounded emitter of second NPN triode；
The colelctor electrode of second NPN triode is connected to the base stage of the PNP triode；
The emitter stage of the PNP triode is connected with the supply power connector end mouth；
The colelctor electrode of the PNP triode is connected with the output port；
Wherein, the conducting voltage sum of the breakdown voltage of the voltage-stabiliser tube and first NPN triode, no more than with institute
State the maximum voltage that the load of output port connection can be carried.
A kind of electronic control unit ECU output circuits, including above-mentioned overvoltage crowbar, ECU modules, supply power supply,
At least one load：
The supply positive source is connected with the supply power connector end mouth of the overvoltage crowbar；
The ECU modules are connected with the GPIO connectivity ports of the overvoltage crowbar；
The output port of the overvoltage crowbar is connected with described at least one load；
At least one carrying ground.
Above-mentioned at least one technical scheme that the embodiment of the present application is adopted can reach following beneficial effect：
The embodiment of the present application provides a kind of overvoltage crowbar, the overvoltage crowbar include supplying power connector end mouth,
Universal input/output GPIO connectivity ports, the first NPN triode, voltage-stabiliser tube, the second NPN triode, PNP triode, output end
Mouthful.The supply power connector end mouth is connected, wherein, the supply power connector end mouth and supply with the negative pole of the voltage-stabiliser tube
The positive pole connection of power supply.The positive pole of the voltage-stabiliser tube is grounded by the first resistor, and the positive pole connection of the voltage-stabiliser tube
To the base stage of first NPN triode, the grounded emitter of first NPN triode, the collection of first NPN triode
Electrode is connected to the GPIO connectivity ports, and the colelctor electrode of first NPN triode and second NPN triode
Base stage connects, and the grounded emitter of second NPN triode, the colelctor electrode of second NPN triode are connected to the PNP
The base stage of triode, the emitter stage of the PNP triode are connected with the supply power connector end mouth.The PNP triode
Colelctor electrode is connected with the output port.Wherein, the electric conduction of the breakdown voltage of the voltage-stabiliser tube and first NPN triode
Pressure sum, no more than loads the maximum voltage that can be carried.
Adopt above-mentioned overvoltage crowbar, during for load supplying, to bear when the voltage of supply power input foregoing circuit is more than
When carrying the maximum voltage that can be carried, so that above-mentioned voltage-stabiliser tube is in breakdown conditions, so that at first NPN triode
In non-cut-off state, then so that the second NPN triode is in cut-off state, then PNP triode is just in cut-off state, finally
So that foregoing circuit is breaking, without voltage-drop loading in load, then just protect load.
Description of the drawings
Accompanying drawing described herein is used for providing further understanding of the present application, constitutes the part of the application, this Shen
Schematic description and description please does not constitute the improper restriction to the application for explaining the application.In the accompanying drawings：
A kind of overvoltage crowbar that Fig. 1 is provided for the embodiment of the present application；
The first overvoltage crowbar that Fig. 2 is provided for the embodiment of the present application；
Second overvoltage crowbar that Fig. 3 is provided for the embodiment of the present application；
The third overvoltage crowbar that Fig. 4 is provided for the embodiment of the present application；
The 4th kind of overvoltage crowbar that Fig. 5 is provided for the embodiment of the present application；
A kind of electronic control unit ECU output circuits that Fig. 6 is provided for the embodiment of the present application.
Specific embodiment
Purpose, technical scheme and advantage for making the application is clearer, below in conjunction with the application specific embodiment and
Corresponding accompanying drawing is clearly and completely described to technical scheme.Obviously, described embodiment is only the application one
Section Example, rather than whole embodiments.Embodiment in based on the application, those of ordinary skill in the art are not being done
The every other embodiment obtained under the premise of going out creative work, belongs to the scope of the application protection.
Below in conjunction with accompanying drawing, the technical scheme that the embodiment of the present application is provided is described in detail.
In order to solve in prior art due to supplying electric power output voltage more than the maximum voltage that load can be carried, cause
The problem that load is damaged or scraps, the embodiment of the present application provide a kind of overvoltage crowbar 12.
The concrete structure schematic diagram of the overvoltage crowbar 12 is as shown in Figure 1.Wherein, the overvoltage crowbar 12 includes supplying
To power connector end mouth 1, universal input/output (General Purpose Input Output, GPIO) connectivity port 2, the
One NPN triode 3, voltage-stabiliser tube 4, first resistor 5, the second NPN triode 6, PNP triode 7 and output port 8.
Supply power connector end mouth 1 is connected with the negative pole of voltage-stabiliser tube 4.Wherein, supply power connector end mouth 1 and supply power supply
Positive pole connection.The positive pole of voltage-stabiliser tube 4 is grounded by first resistor 5, and the positive pole of voltage-stabiliser tube 4 is connected to tri- poles of a NPN
The base stage of pipe 3.The grounded emitter of the first NPN triode 3, the colelctor electrode of the first NPN triode 3 are connected to GPIO connectivity ports
2, and the colelctor electrode of the first NPN triode 3 is connected with the base stage of the second NPN triode 6.Wherein, GPIO connectivity ports 2 with
GPIO connects.The grounded emitter of the second NPN triode 6, the colelctor electrode of the second NPN triode 6 are connected to PNP triode 7
Base stage.The emitter stage of PNP triode 7 is connected with supply power connector end mouth 1.Wherein, supply power connector end mouth 1 and supply electricity
The positive pole connection in source.The colelctor electrode of PNP triode 7 is connected with output port 8.It should be noted that above-mentioned be connected to, Ke Yiyong
In show two components and parts be directly connected to together, or be indirectly connected with together.If in the embodiment of the present application
In, above-mentioned it is connected to for showing that two components and parts are indirectly connected with together, then can pass through between two components and parts
Other components and parts are indirectly connected with together.Other components and parts above-mentioned can be the components and parts such as resistance.
Wherein, the conducting voltage sum of the breakdown voltage of voltage-stabiliser tube 4 and the first NPN triode 3, no more than and output port
The maximum voltage that the load of 8 connections can be carried.Above-mentioned GPIO is general input/output port, in the embodiment of the present application, should
GPIO is input port, be mainly used in the system that is connected with the GPIO or other circuits to 12 input voltage of overvoltage crowbar or
Electric current, to control the working condition of the overvoltage crowbar 12, that is, controls the overvoltage crowbar 12 in channel status or disconnected
Line state.
After the positive pole for supplying power supply is connected with supply power connector end mouth 1, if the system being connected with GPIO or other electricity
Road is not through the GPIO to 12 input voltage of overvoltage crowbar or electric current, then overvoltage crowbar 12 is just in breaking shape
State, just can not outside output voltage.If the system being connected with GPIO or other circuits are by the GPIO to overvoltage crowbar 12
Have input voltage or electric current, then overvoltage crowbar 12 just there may be following three kinds of situations：
Situation one：The voltage of supply electrical source input overvoltage protection circuit 12, more than the breakdown voltage and first of voltage-stabiliser tube 4
The conducting voltage sum of NPN triode 3, then voltage-stabiliser tube 4 is just in breakdown conditions, so that being carried in first resistor 5
Voltage not less than the first NPN triode 3 conducting voltage, then due to the grounded emitter of the first NPN triode 3, then by
In the voltage being carried in 3 base stage of the first NPN triode not less than the first NPN triode 3 conducting voltage, then a NPN
Triode 3 is just in non-cut-off state.When the first NPN triode 3 is in non-cut-off state, first NPN triode 3 is sent out
Voltage between emitter-base bandgap grading and colelctor electrode approximate can regard zero as.Again due to the grounded emitter of the second NPN triode, this will lead
The voltage being carried in 6 base stage of the second NPN triode is caused to be less than the conducting voltage of the second NPN triode 6, then the 2nd NPN
Triode 6 is just in cut-off state, then PNP triode is just in cut-off state, and the overvoltage crowbar 12 is just in open circuit
State, it is impossible to outside output voltage, so that just protect the load being connected with output port 8.Wherein, the electricity for exporting in GPIO
Pressure or electric current can be arbitrary value.
Situation two：The voltage of supply electrical source input overvoltage protection circuit 12, not less than the breakdown voltage of voltage-stabiliser tube 4, but
Less than the conducting voltage of the first NPN triode 3, then voltage-stabiliser tube 4 is just in breakdown conditions, but is carried in first resistor 5
Voltage less than the first NPN triode 3 conducting voltage, then the first NPN triode 3 be in cut-off state, then a NPN tri-
Pole pipe 3 does not just interfere with the voltage being carried in the second NPN triode base stage.When system or other circuits by GPIO to overvoltage
When the voltage or electric current of the input of protection circuit 12 meets the turn-on condition of the second NPN triode 6, second NPN triode 6 just may be used
It is in non-cut-off state.As when the second NPN triode 6 is in non-cut-off state, the resistance of second NPN triode can be near
Seemingly regard zero as, just it is believed that the second NPN triode 6 not partial pressure.So it is considered that being carried in 7 base stage of PNP triode
Voltage is equal to the voltage that system or other circuits are input into overvoltage crowbar 12 by GPIO.In addition, being carried in PNP triode
Voltage on 7 emitter stages is the voltage for supplying electrical source input overvoltage protection circuit 12.So, if supply electrical source input overvoltage protection
The voltage of circuit 12, meets the turn-on condition of PNP triode 7 with the difference of the voltage of protection circuit against input over-voltage in GPIO 12,
So the PNP triode 7 just can be at non-cut-off state, then the overvoltage crowbar 12 is just in channel status, Ke Yizheng
The load service voltage of the connection of Chang Weiyu output ports 8.
Situation three：The voltage of supply electrical source input overvoltage protection circuit 12, less than the breakdown voltage of voltage-stabiliser tube 4, then steady
Pressure pipe 4 just wears state in cut-off, and the first NPN triode 3 is in cut-off state, then the first NPN triode 3 is not just interfered with
The voltage being carried in the second NPN triode base stage.
At this moment, tri- poles of the 2nd NPN for referring in the second NPN triode 6, the working condition of PNP triode 7 and situation two
Pipe 6, PNP triode 7 working condition identical, then the overvoltage crowbar 12 just in channel status, can be normally with
The load service voltage of the connection of output port 8.
Therefore, the overvoltage crowbar 12 for being provided using the embodiment of the present application, when supply power supply is to the overvoltage crowbar
When the voltage of 12 inputs no more than loads the maximum voltage that can be carried, the overvoltage crowbar just can be normally carried for the load
Voltage supplied；When supply power supply is more than the maximum voltage that load can be carried to the voltage of the input of overvoltage crowbar 12, should
Overvoltage crowbar 12 is just in off state, it is impossible to provides voltage for above-mentioned load, just can protect load.
Further, in order to protect the first NPN triode 3, the electric current because 3 place circuit of the first NPN triode is prevented
Excessive, cause the first NPN triode 3 to be damaged or scrap, overvoltage crowbar 12 as shown in Figure 1 can also include second resistance
9, can be found in Fig. 2.The positive pole of so voltage-stabiliser tube 4 is grounded by first resistor 5, and the positive pole of voltage-stabiliser tube 4 passes through second resistance 9
It is indirectly connected to the base stage of the first NPN triode.Wherein, it is parallel relationship between first resistor 5 and second resistance.In voltage-stabiliser tube
4 and first add second resistance 9 between NPN triode 3, can increase the resistance of 3 place circuit of the first NPN triode, can be with
Reduce the electric current of 3 place circuit of the first NPN triode as far as possible, avoid as far as possible due to first NPN triode 3 in circuit
Electric current is excessive, and causes the first NPN triode 3 to be damaged or scrap.
Further, based on protection the first NPN triode 3 identical the reasons why, in order to protect the second NPN triode 6, such as
Overvoltage crowbar 12 shown in Fig. 1 can also include 3rd resistor 10, can be found in Fig. 3.The collection of so the first NPN triode 3
Electrode is indirectly connected to GPIO connectivity ports 2, and the colelctor electrode of the first NPN triode 3 and the 2nd NPN by 3rd resistor 10
The base stage connection of triode 6.Add 3rd resistor 10 in overvoltage crowbar 12, tri- poles of the 2nd NPN can be increased as far as possible
The resistance of 6 place circuit of pipe, reduces the electric current of 6 place circuit of the second NPN triode as far as possible, just can avoid as far as possible due to
The electric current of two NPN triodes, 6 place circuit is excessive to cause the second NPN triode 6 to be damaged or scrap.
Further, based on the first NPN triode 3 of protection identical the reasons why, in order to protect PNP triode 7, such as Fig. 1
Shown overvoltage crowbar 12 can also include the 4th resistance 11, can be found in Fig. 4.The colelctor electrode of so the second NPN triode 6
The base stage that PNP triode 7 is indirectly connected to by the 4th resistance 11.Add the 4th resistance 11 in overvoltage crowbar 12, can
To increase the resistance of 7 place circuit of PNP triode, reduce the electric current of 7 place circuit of PNP triode as far as possible, just can try one's best
Avoid as the electric current of 7 place circuit of PNP triode is excessive, and cause PNP triode 7 impaired or scrap.
Wherein, the resistance of above-mentioned second resistance 9,3rd resistor 10 and the 4th resistance 11 is protected with supply power input overvoltage
The voltage of protection circuit 12, the electric current of GPIO connectivity ports input and the first NPN triode 3, the second NPN triode 6, PNP tri-
Situations such as maximum current that pole pipe 7 can be born, is relevant, therefore, it can according to actual conditions, selects resistance suitable second
Resistance 9,3rd resistor 10 and the 4th resistance 11.
In order that overvoltage crowbar itself more safety and stability, can be according to above-mentioned second resistance 9,3rd resistor 10
And the 4th resistance 11 distinguish corresponding connected mode, second resistance 9,3rd resistor 10 and the 4th resistance 11 are connected respectively
To in overvoltage crowbar 12 as shown in Figure 1, the structural representation of the overvoltage crowbar 12 is referring to Fig. 5.Or according to reality
Border demand, any two resistance in above-mentioned second resistance 9,3rd resistor 10 and the 4th resistance 11 is connected to as shown in Figure 1
Overvoltage crowbar 12 in.
The embodiment of the present application also provides a kind of electronic control unit including overvoltage crowbar 12 as shown in Figure 1
(Electronic Control Unit, ECU) output circuit 16.The ECU output circuits 16, can be applicable in automobile, be automobile
In each load supplying.The structural representation of the ECU output circuits 16 is as shown in Figure 6.The ECU output circuits 16 include over-pressed guarantor
Protection circuit 12, ECU modules 13, supply power supply 14 and at least one load 15.Wherein, supply 14 positive pole of power supply and overvoltage protection
The supply power connector end mouth 1 of circuit 12 connects, and ECU modules 13 are connected with the GPIO connectivity ports 2 of overvoltage crowbar 12, mistake
The output port 8 of voltage protection circuit 12 is connected with least one load 15, and at least one load 15 is grounded.
Wherein, GPIO can be included in ECU modules 13, ECU modules 13 can be input into overvoltage crowbar 12 by GPIO
Voltage or electric current, the ECU modules 13 can be the equipment such as car machine, vehicle-mounted computer.
Above-mentioned ECU output circuits 16 are installed in the car, what automobile just can be safe provides voltage for various components and parts, protects
Hinder the normal use of each function of automobile.
In addition, second can also be included in the overvoltage crowbar 12 as shown in Figure 1 that includes of above-mentioned ECU output circuits 16
At least one of resistance 9,3rd resistor 10 or the 4th resistance 11 resistance.Above-mentioned second resistance 9,3rd resistor 10 or the 4th electricity
At least one of resistance 11 connected mode of the resistance in overvoltage crowbar 12 as shown in Figure 1, may refer to the application reality
In the above-mentioned second resistance 9,3rd resistor 10 or the 4th resistance 11 that refer in the overvoltage crowbar 12 that example offer is provided at least
The connected mode of one resistance, is no longer repeated herein.
Overvoltage crowbar 12 and ECU output circuits 16 that the embodiment of the present application is provided, enable to when supply power supply
When the voltage of protection circuit against input over-voltage 12 or ECU output circuits 16 no more than loads the maximum voltage that can be carried, the overvoltage
Protection circuit 12 or ECU output circuits 16 just can normally provide voltage for the load；When supply power supply is to the overvoltage protection electricity
During the maximum voltage that the voltage of road 12 or ECU output circuits 16 can be carried more than load, the overvoltage crowbar 12 or ECU are defeated
Go out circuit 16 in off state, it is impossible to voltage is provided for above-mentioned load, just can protect load.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can adopt complete hardware embodiment, complete software embodiment or with reference to software and hardware in terms of reality
Apply the form of example.And, the present invention can be adopted in one or more computers for wherein including computer usable program code
The upper computer program that implements of usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) is produced
The form of product.
The present invention is the flow process with reference to method according to embodiments of the present invention, equipment (system) and computer program
Figure and/or block diagram are describing.It should be understood that can be by computer program instructions flowchart and/or each stream in block diagram
Journey and/or the combination of square frame and flow chart and/or the flow process in block diagram and/or square frame.These computer programs can be provided
Instruct the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine so that produced for reality by the instruction of computer or the computing device of other programmable data processing devices
The device of the function of specifying in present one flow process of flow chart or one square frame of multiple flow processs and/or block diagram or multiple square frames.
These computer program instructions may be alternatively stored in and can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory is produced to be included referring to
Make the manufacture of device, the command device realize in one flow process of flow chart or one square frame of multiple flow processs and/or block diagram or
The function of specifying in multiple square frames.
These computer program instructions can be also loaded in computer or other programmable data processing devices so that in meter
Series of operation steps is executed on calculation machine or other programmable devices to produce computer implemented process, so as in computer or
The instruction executed on other programmable devices is provided for realization in one flow process of flow chart or multiple flow processs and/or block diagram one
The step of function of specifying in individual square frame or multiple square frames.
In a typical configuration, computing device includes one or more processors (CPU), input/output interface, net
Network interface and internal memory.
Internal memory potentially includes the volatile memory in computer-readable medium, random access memory (RAM) and/or
The forms such as Nonvolatile memory, such as read-only storage (ROM) or flash memory (flash RAM).Internal memory is computer-readable medium
Example.
Computer-readable medium includes that permanent and non-permanent, removable and non-removable media can be by any method
Or technology is realizing information Store.Information can be computer-readable instruction, data structure, the module of program or other data.
The example of the storage medium of computer includes, but are not limited to phase transition internal memory (PRAM), static RAM (SRAM), moves
State random access memory (DRAM), other kinds of random access memory (RAM), read-only storage (ROM), electric erasable
Programmable read only memory (EEPROM), fast flash memory bank or other memory techniques, read-only optical disc read-only storage (CD-ROM),
Digital versatile disc (DVD) or other optical storages, magnetic cassette tape, the storage of tape magnetic rigid disk or other magnetic storage apparatus
Or any other non-transmission medium, can be used to store the information that can be accessed by a computing device.Define according to herein, calculate
Machine computer-readable recording medium does not include temporary computer readable media (transitory media), the such as data-signal and carrier wave of modulation.
Also, it should be noted term " including ", "comprising" or its any other variant are intended to nonexcludability
Comprising so that a series of process, method, commodity or equipment including key elements not only includes those key elements, but also wrapping
Other key elements being not expressly set out are included, or also includes intrinsic for this process, method, commodity or equipment wanting
Element.In the absence of more restrictions, the key element for being limited by sentence "including a ...", it is not excluded that including described wanting
Also there is other identical element in the process of element, method, commodity or equipment.
It will be understood by those skilled in the art that embodiments herein can be provided as method, system or computer program.
Therefore, the application can adopt complete hardware embodiment, complete software embodiment or with reference to software and hardware in terms of embodiment
Form.And, the application can be adopted to can use in one or more computers for wherein including computer usable program code and be deposited
The shape of the upper computer program that implements of storage media (including but not limited to magnetic disc store, CD-ROM, optical memory etc.)
Formula.
Embodiments herein is the foregoing is only, the application is not limited to.For those skilled in the art
For, the application can have various modifications and variations.All any modifications that is made within spirit herein and principle, equivalent
Replace, improve etc., within the scope of should be included in claims hereof.
Claims (5)
1. a kind of overvoltage crowbar, it is characterised in that the circuit includes supplying power connector end mouth, universal input/output
GPIO connectivity ports, the first NPN triode, voltage-stabiliser tube, first resistor, the second NPN triode, PNP triode, output port,
Wherein：
The supply power connector end mouth is connected, wherein, the supply power connector end mouth and confession with the negative pole of the voltage-stabiliser tube
Connect to the positive pole of power supply；
The positive pole of the voltage-stabiliser tube is grounded by the first resistor, and the positive pole of the voltage-stabiliser tube is connected to described first
The base stage of NPN triode；
The grounded emitter of first NPN triode；
The colelctor electrode of first NPN triode is connected to the GPIO connectivity ports, and the collection of first NPN triode
Electrode is connected with the base stage of second NPN triode；Wherein, the GPIO connectivity ports are connected with GPIO；
The grounded emitter of second NPN triode；
The colelctor electrode of second NPN triode is connected to the base stage of the PNP triode；
The emitter stage of the PNP triode is connected with the supply power connector end mouth；
The colelctor electrode of the PNP triode is connected with the output port；
Wherein, the conducting voltage sum of the breakdown voltage of the voltage-stabiliser tube and first NPN triode, no more than defeated with described
The maximum voltage that the load of exit port connection can be carried.
2. overvoltage crowbar as claimed in claim 1, it is characterised in that the overvoltage crowbar also includes the second electricity
Resistance：
The positive pole of the voltage-stabiliser tube is grounded by the first resistor, and the positive pole of the voltage-stabiliser tube is by the second resistance
It is indirectly connected to the base stage of first NPN triode.
3. overvoltage crowbar as claimed in claim 1 or 2, it is characterised in that the overvoltage crowbar also includes the 3rd
Resistance；
The colelctor electrode of first NPN triode is indirectly connected to the GPIO connectivity ports by the 3rd resistor, and
The colelctor electrode of first NPN triode is connected with the base stage of second NPN triode.
4. the overvoltage crowbar as described in arbitrary claim in claims 1 to 3, it is characterised in that the overvoltage crowbar
Also include the 4th resistance；
The colelctor electrode of second NPN triode is indirectly connected to the base stage of the PNP triode by the 4th resistance.
5. a kind of electronic control unit ECU output circuits, it is characterised in that include as described in arbitrary claim in Claims 1 to 4
Overvoltage crowbar, ECU modules, supply power supply, at least one load：
The supply positive source is connected with the supply power connector end mouth of the overvoltage crowbar；
The ECU modules are connected with the GPIO connectivity ports of the overvoltage crowbar；
The output port of the overvoltage crowbar is connected with described at least one load；
At least one carrying ground.
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| CN201611039508.8A CN106505516B (en) | 2016-11-21 | 2016-11-21 | A kind of overvoltage crowbar and electronic control unit ECU output circuit |
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| CN201611039508.8A CN106505516B (en) | 2016-11-21 | 2016-11-21 | A kind of overvoltage crowbar and electronic control unit ECU output circuit |
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| CN106505516B CN106505516B (en) | 2019-06-28 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107482605A (en) * | 2017-09-30 | 2017-12-15 | 广西玉柴机器股份有限公司 | A kind of anti-over-pressed K line communication devices |
| CN109462213A (en) * | 2018-10-26 | 2019-03-12 | 深圳市睿德电子实业有限公司 | IC chip protection circuit against input over-voltage and its guard method |
| CN109936350A (en) * | 2019-03-11 | 2019-06-25 | 北京汇能精电科技股份有限公司 | Electronic switching circuit |
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| CN109462213A (en) * | 2018-10-26 | 2019-03-12 | 深圳市睿德电子实业有限公司 | IC chip protection circuit against input over-voltage and its guard method |
| CN109936350A (en) * | 2019-03-11 | 2019-06-25 | 北京汇能精电科技股份有限公司 | Electronic switching circuit |
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