CN106998056B - Hardware diagnosis protection circuit - Google Patents
Hardware diagnosis protection circuit Download PDFInfo
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- CN106998056B CN106998056B CN201710259025.7A CN201710259025A CN106998056B CN 106998056 B CN106998056 B CN 106998056B CN 201710259025 A CN201710259025 A CN 201710259025A CN 106998056 B CN106998056 B CN 106998056B
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- triode
- protection circuit
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- ecu1
- resistor
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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
- H02H3/08—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 current
Abstract
The invention discloses a hardware diagnosis protection circuit, which comprises an ECU1 communication circuit and an ECU2 power supply circuit, wherein a triode Q1 of the ECU1 communication circuit is controlled by a driving signal Vin, and a collector of the Q1 is connected with the ECU2 power supply circuit, and the hardware diagnosis protection circuit is characterized in that: a protection circuit is connected with a collector of Q1, the protection circuit consists of a main protection circuit and a limit value protection circuit, the main protection circuit comprises Q2, Q3 and R4, wherein an emitter of Q2 is connected with a collector of Q1, a base of Q2 is connected with a collector of Q3, a base of Q3 is connected with R4, and the other side of R4 is connected with an input end of an ECU1 communication circuit; the limiting value protection circuit comprises voltage regulators Z1, R5, R6 and Q4, wherein the voltage regulators Z1, R5 and R6 are sequentially connected, the input end of the voltage regulator Z1 is connected with the collector of Q2, the base of Q4 is connected with the collectors of R5 and R6, and the collector of Q4 is connected with the base of Q1. The invention is a pure hardware circuit and has the advantages of low cost, high reliability and quick short-circuit protection action.
Description
Technical Field
The invention relates to the technical field of automobile electronic function circuits, in particular to a hardware diagnosis protection circuit.
Background
In automotive electronics, communication is often required between ECUs (Electronic control units), as shown in fig. 2, a transistor Q1 is driven by a drive signal Vin-5V in the ECU1, the transistor Q1 is saturated and turned on or off, the V-flag signal level is pulled low or maintained high, and the ECU2 can determine the level of the drive signal Vin-5V in the ECU1 by detecting the level of the V-flag signal.
When the driving signal Vin-5V in the ECU1 is high, the transistor Q1 is driven, and after the transistor Q1 is saturated and turned on, the V-diag signal level is pulled low, and the ECU2 can determine that the driving signal Vin-5V inside the ECU1 is high by detecting that the V-diag signal level is low. Similarly, when the driving signal Vin-5V in the ECU1 is output low, the transistor Q1 is driven, the transistor Q1 is turned off, the V-diag signal level is maintained high, and the ECU2 can determine that the driving signal Vin-5V output inside the ECU1 is low by detecting that the V-diag signal level is high. However, when resistor R3 inside ECU2 is shorted, or when the terminal signal V-diag connecting ECU1 and ECU2 is shorted to the positive battery voltage V-bat on ECU2, the V-diag signal will remain high all the time, and transistor Q1 inside ECU1 will flow a large current, possibly causing excessive power consumption damage of transistor Q3.
For this reason, a V-detect protection circuit is often added to the existing ECU communication circuit, as shown in fig. 3, when an abnormal condition occurs (when a resistor R3 inside the ECU2 is short-circuited, or when a signal V-diag at a connection terminal of the ECU1 and the ECU2 is short-circuited to a positive battery voltage V-bat on the ECU 2), the V-diag signal is always at a high level, and the single chip microcomputer detects the level of the V-detect signal, so as to determine whether the abnormal condition occurs, and take measures to pull down the Vin-5V signal, and turn off the triode Q1.
However, this approach has some disadvantages as follows:
1. the I/O port signal V-detect controlled by a single chip microcomputer or using more than one single chip microcomputer can increase the cost of the project.
2. The detection and protection of the single chip microcomputer usually have some time delay, and when an abnormal condition occurs, a hardware circuit is damaged when the detection or protection action of the single chip microcomputer is not finished.
When some customers require high safety of automobile electronic functions, software protection measures generally cause the problems of software runaway and the like and abnormal reset of a single chip microcomputer, and the reliability of the software protection functions is considered to be not high enough.
Disclosure of Invention
The invention aims to provide a novel hardware diagnosis protection circuit with low cost and hardware protection, which overcomes the defects in the prior art.
The technical scheme for solving the technical problem is as follows: a hardware diagnosis protection circuit comprises an ECU1 communication circuit and an ECU2 power circuit, wherein a transistor Q1 of the ECU1 communication circuit is controlled by a driving signal Vin, and a collector of the transistor Q1 is connected with the ECU2 power circuit, and is characterized in that: the protection circuit is connected with the collector of the triode Q1 and comprises a main protection circuit and a limit value protection circuit, wherein the main protection circuit comprises a triode Q2, a triode Q3 and a resistor R4, the emitter of the triode Q2 is connected with the collector of the triode Q1, the base of the triode Q2 is connected with the collector of the triode Q3, the base of the triode Q3 is connected with the resistor R4, and the other side of the resistor R4 is connected with the input end of the ECU1 communication circuit; the limit value protection circuit comprises a voltage regulator tube Z1, a resistor R5, a resistor R6 and a triode Q4, wherein the voltage regulator tube Z1, the resistor R5 and the resistor R6 are sequentially connected, the input end of the voltage regulator tube Z1 is connected with the collector electrode of the triode Q2, the base electrode of the triode Q4 is connected with the resistor R5 and the resistor R6, and the collector electrode of the triode Q4 is connected with the base electrode of the triode Q1.
The invention has the beneficial effects that:
the invention is a pure hardware circuit, has low cost, high reliability, fast short-circuit protection action and adjustable short-circuit protection value. The resistor R4, the capacitor C1, the triode Q2 and the triode Q3 are used for switching the V-diag signal. Wherein the resistor R4 and the capacitor C1 have signal delay function. Transistor Q2 and transistor Q3 are used for switching.
The voltage regulator tube Z1, the resistor R5, the resistor R6 and the triode Q4 are used for protecting the circuit in abnormal conditions. A zener diode Z1 is used to ensure that the diagnostic protection circuit will only operate if the V-bat voltage is high enough. When an abnormal condition occurs (for example, when a resistor R3 in the ECU2 is short-circuited, or a signal V-diag at the connection terminal of the ECU1 and the ECU2 is short-circuited to a positive battery voltage V-bat on the ECU 2), when the Vin-5V signal is output to be high, the triode Q3 and the triode Q2 are in saturated conduction, the voltage regulator tube Z1 is broken down and conducted, so that the Q4 is in saturated conduction, and finally the triode Q1 is turned off.
Drawings
Fig. 1 is a schematic diagram of the novel hardware diagnostic protection circuit of the present invention.
Fig. 2 is a schematic diagram of a conventional electronic ECU communication circuit of an automobile.
Fig. 3 is a schematic diagram of a conventional short circuit detection circuit of automotive electronic ECU software.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, a fixed connection unless expressly specified or limited otherwise. Can also be detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, a novel hardware diagnosis protection circuit comprises an ECU1 communication circuit and an ECU2 power circuit, wherein a transistor Q1 of the ECU1 communication circuit is controlled by a driving signal Vin, and a collector of the transistor Q1 is connected with the ECU2 power circuit, and is characterized in that: the protection circuit is connected with the collector of the triode Q1 and comprises a main protection circuit and a limit value protection circuit, wherein the main protection circuit comprises a triode Q2, a triode Q3 and a resistor R4, the emitter of the triode Q2 is connected with the collector of the triode Q1, the base of the triode Q2 is connected with the collector of the triode Q3, the base of the triode Q3 is connected with the resistor R4, and the other side of the resistor R4 is connected with the input end of the ECU1 communication circuit; the limit value protection circuit comprises a voltage regulator tube Z1, a resistor R5, a resistor R6 and a triode Q4, wherein the voltage regulator tube Z1, the resistor R5 and the resistor R6 are sequentially connected, the input end of the voltage regulator tube Z1 is connected with the collector electrode of the triode Q2, the base electrode of the triode Q4 is connected with the resistor R5 and the resistor R6, and the collector electrode of the triode Q4 is connected with the base electrode of the triode Q1.
The working principle of the circuit is as follows:
assuming that R3 is shorted, the collector terminal V-diag of Q1 is high, and Vin-5V input is high, so that Q1 is conducted, at this time, R4 and Q3 of the main protection circuit are conducted, so that Q2 is conducted, and the current from ECU2 is separated from Q2 and Q3, so that Q1 is protected. When Q2 is conducted, if the voltage value of V-diag is larger than the voltage regulation limit value of a voltage regulator tube Z1, Z1 is conducted to enable Q4 to be conducted, and at the moment, the voltage Vce-Q1 of a base terminal of Q1 is 0 to enable Q1 to be cut off, so that the function of protecting Q1 is achieved.
The scope of the invention is defined by the claims and their equivalents, and all modifications without inventive faculty should be included in the scope of the invention.
Claims (1)
1. A hardware diagnosis protection circuit comprises an ECU1 communication circuit and an ECU2 power circuit, wherein a triode Q1 of the ECU1 communication circuit is controlled by a driving signal Vin, a collector of the triode Q1 is connected with the ECU2 power circuit, when the driving signal Vin-5V in the ECU1 is output high, the triode Q1 is driven, after the triode Q1 is in saturated conduction, the V-diag signal level is pulled down, and the ECU2 can judge that the driving signal Vin-5V in the ECU1 is high level by detecting that the V-diag signal level is low; when the driving signal Vin-5V in the ECU1 is output low, the transistor Q1 is driven, the transistor Q1 is turned off, the V-diag signal level is maintained high, and the ECU2 can judge that the driving signal Vin-5V output inside the ECU1 is low by detecting that the V-diag signal level is high, wherein: the protection circuit is connected with the collector of the triode Q1 and comprises a main protection circuit and a limit value protection circuit, wherein the main protection circuit comprises a triode Q2, a triode Q3 and a resistor R4, the emitter of the triode Q2 is connected with the collector of the triode Q1, the base of the triode Q2 is connected with the collector of the triode Q3, the base of the triode Q3 is connected with the resistor R4, and the other side of the resistor R4 is connected with the input end of the ECU1 communication circuit; the limit value protection circuit comprises a voltage regulator tube Z1, a resistor R5, a resistor R6 and a triode Q4, wherein the voltage regulator tube Z1, the resistor R5 and the resistor R6 are sequentially connected, the input end of the voltage regulator tube Z1 is connected with the collector of the triode Q2, the base of the triode Q4 is connected with the resistor R5 and the resistor R6, and the collector of the triode Q4 is connected with the base of the triode Q1; when an abnormal condition occurs and a driving signal Vin-5V in the ECU1 is output to be high, the triode Q3 and the triode Q2 are conducted in a saturated mode, the voltage regulator tube Z1 is conducted in a breakdown mode, the Q4 is conducted in a saturated mode, and the triode Q1 is turned off finally.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710259025.7A CN106998056B (en) | 2017-04-20 | 2017-04-20 | Hardware diagnosis protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710259025.7A CN106998056B (en) | 2017-04-20 | 2017-04-20 | Hardware diagnosis protection circuit |
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| CN106998056A CN106998056A (en) | 2017-08-01 |
| CN106998056B true CN106998056B (en) | 2020-04-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN206727632U (en) * | 2017-04-20 | 2017-12-08 | 顺德职业技术学院 | Diagnostic signal short-circuit detecting circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201750125U (en) * | 2010-06-24 | 2011-02-16 | 上海航天汽车机电股份有限公司 | Short circuit self-locking protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206727632U (en) * | 2017-04-20 | 2017-12-08 | 顺德职业技术学院 | Diagnostic signal short-circuit detecting circuit |
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