CN207232324U - A kind of fault diagnosis circuit of low side driving - Google Patents
A kind of fault diagnosis circuit of low side driving Download PDFInfo
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- CN207232324U CN207232324U CN201721060626.7U CN201721060626U CN207232324U CN 207232324 U CN207232324 U CN 207232324U CN 201721060626 U CN201721060626 U CN 201721060626U CN 207232324 U CN207232324 U CN 207232324U
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- circuit
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- side drive
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Abstract
The utility model provides a kind of fault diagnosis circuit of low side driving, is connected to power supply by driving load its one end, the other end connects the output interface of low side drive circuit, and fault diagnosis circuit includes：The first divider resistance and the second divider resistance being connected in series between a reference voltage and ground wire, the common port of two divider resistances are connected to the output interface of the low side drive circuit；Voltage comparator circuit, its voltage receiving port are connected to the common port of two divider resistances.By upper, the voltage for being exported low side drive circuit output interface by voltage comparator circuit is compared with the reference voltage after partial pressure, due to the presence of divider resistance, when the comparative result of voltage comparator circuit is equal, show that open fault occurs in the output interface of low side drive circuit, rather than be short power failure.Compared with the prior art, the particular type that the fault diagnosis circuit involved by the application can be out of order with accurate judgement, consequently facilitating follow-up maintenance or other operations.
Description
Technical field
Measurement of electric parameter technical field is the utility model is related to, particularly a kind of fault diagnosis circuit of low side driving.
Background technology
Many low side drive circuits directly drive load object using special chip or metal-oxide-semiconductor, without diagnostic circuit, or electricity
Road diagnosis is realized by the function of chip itself.If by the way of metal-oxide-semiconductor directly drives, system cannot be distinguished by for low side driving
It has driving interface failure；And driven using special driving chip, if driving chip is in itself without fault diagnosis or for event
Barrier situation cannot distinguish between, and also None- identified goes out actual malfunction to system.Such as Application No. CN201510471078.6
Chinese invention patent, be according to the enabled state based on low side drive circuit with the luminance of light-emitting component whether one
Cause, determine whether the low side drive circuit is normal.The original paper that shines is connected with testing element.This application file is to be only capable of sentencing
Whether breaking, it is normal low side drive circuit, but None- identified goes out actual malfunction.
Utility model content
The main purpose of the utility model is that a kind of fault diagnosis circuit of low side driving is provided, it is more electric by voltage
The voltage that road is exported low side drive circuit output interface is compared with the reference voltage after partial pressure, due to divider resistance
In the presence of, when the comparative result of voltage comparator circuit is equal, that is, show that open fault occurs in the output interface of low side drive circuit,
Rather than it is short power failure.Compared with the prior art, the fault diagnosis circuit involved by the application can be out of order with accurate judgement
Particular type, consequently facilitating follow-up maintenance or other operation.
Above-mentioned technical problem is solved, power supply is connected to by driving load its one end, the other end connects low side drive circuit
Output interface, fault diagnosis circuit include：
The first divider resistance and the second divider resistance being connected in series between a reference voltage and ground wire, two partial pressures
The common port of resistance is connected to the output interface of the low side drive circuit；
Voltage comparator circuit, its voltage receiving port are connected to the common port of two divider resistances.
Wherein, other ports of voltage receiving port also with the power supply of the voltage comparator circuit are connected.
By upper, carried out by the voltage that voltage comparator circuit is exported low side drive circuit output interface and supply voltage
Compare, when the two is equal, that is, show that short power failure occurs in the output interface of low side drive circuit.Compared with the prior art,
The particular type that fault diagnosis circuit involved by the application can be out of order with accurate judgement, consequently facilitating follow-up maintenance or
Other operations.
Wherein, other voltage receiving ports of the voltage comparator circuit are also connected with a 0V voltages.
By upper, the voltage and 0 voltage of ground wire that are exported low side drive circuit output interface by voltage comparator circuit
It is compared, when the two is equal, that is, shows that short earth fault occurs in the output interface of low side drive circuit.Compared to existing skill
Art, the particular type that the fault diagnosis circuit involved by the application can be out of order with accurate judgement, consequently facilitating follow-up maintenance
Or other operations.
Wherein, the voltage comparator circuit is the microcontroller with built-in A/D module.
By upper, SCM Based logic processing capability, the different voltages value received to its each port calculates, with
Realize and determined for failure.
Wherein, the voltage comparator circuit includes plurality of voltages comparator, and the one input end of each voltage comparator connects
Low side drive circuit output interface is connected to, another input terminal of each voltage comparator connects the interface of supply voltage, reference respectively
The interface of the interface of voltage and 0 voltage.
By upper, low side drive circuit output interface and power supply electricity can be achieved at the same time by the very low voltage comparator of cost
The comparison of pressure, reference voltage and 0 voltage, so as to accurately determine fault type.
Wherein, input selection circuit is further included, plurality of voltages comparator is connected to and connects with low side drive circuit output interface
On the circuit connect, the input selection circuit is used to make choice according to the input signal of each voltage comparator of ordered pair when presetting.
By upper, the fault condition of low side drive circuit output interface is investigated one by one by input selection circuit, it is of low cost
And efficiently.
Wherein, wave filter is further included, is connected to time that plurality of voltages comparator is connected with low side drive circuit output interface
Lu Shang.
By upper, the noise reduction to analog voltage to be detected is realized.
Wherein, warning circuit is further included, is connected with the output terminal of the voltage comparator circuit.
By upper, when low side drive circuit output interface break down when, can be allowed by warning circuit user in time or
The generation of failure.
Brief description of the drawings
Fig. 1 is the fault diagnosis circuit principle schematic of low side driving；
Fig. 2 is the circuit theory schematic diagram of an embodiment of Fig. 1；
Fig. 3 is the fundamental diagram of the fault diagnosis circuit of low side driving.
Embodiment
It is described in detail referring to the fault diagnosis circuit of Fig. 1~3 pair low side driving described in the utility model.
It is as shown in Figure 1 circuit theory schematic diagram, power supply is connected to by 100 one end of driving load, the other end connects low side
The output interface of drive circuit 200.Connect same as the prior art, repeat no more above.
Fault diagnosis circuit is connected with the output interface of the low side drive circuit 200, including a voltage comparator circuit 400
With a component piezoresistance.
The divider resistance includes the first divider resistance 301 being connected in series between reference voltage and ground wire and second point
Piezoresistance 302, the common port of two divider resistances is connected to the output interface of low side drive circuit 200 and voltage compares
Circuit 400.
As shown in Fig. 2, in the present embodiment, the voltage comparator circuit 400 can use plurality of voltages comparator to realize, each electricity
The one input end of pressure comparator is connected to low side drive circuit output interface, another input terminal difference of each voltage comparator
Connect interface, the output interface of low side drive circuit 200 and the interface of 0 voltage of supply voltage.
Preferably, in each road voltage comparator front end, wave filter is also connected with, so that noise reduction can be realized.
More preferably, the input selection circuit being connected with the plurality of voltages comparator, the input selection circuit are further included
For being made choice according to the input signal of each voltage comparator of ordered pair when presetting, low side driving electricity is also turned on to control respectively
The interface of road output interface and supply voltage, it is low in the interface of drive circuit output interface and 0 voltage, it is low while drive circuit export
The interface of interface and reference voltage, to realize respectively by low side drive circuit output interface and the ratio of above three interface voltage
Compared with.
In the present embodiment, the input selection circuit can use the switch being series on each road voltage comparator current supply circuit
Realize, can also use the chip microcontroller being connected with each voltage comparator control terminal, each voltage comparator is controlled by microcontroller
Work schedule.In short, the present embodiment is not defined for the instantiation of input selection circuit.
Or the voltage comparator circuit 400 can also be by including the chip microcontroller with built-in A/D module, to realize
Voltage is carried out inside the microcontroller and compares calculating.
In addition, further including a warning circuit 500, it is electrically connected with the voltage comparator circuit 400, when the voltage is more electric
When the judging result on road 400 is breaks down, then a control signal is exported to the warning circuit 500, to control warning circuit
500 alarm.The warning circuit 500 includes but not limited to photoelectric alarm circuit, display screen warning circuit or GSM alarms
Circuit.The GSM warning circuits can notify user to break down by forms such as short message or phones.
Fig. 3 show the operation principle of the fault diagnosis circuit of low side driving, and fault diagnosis comprises the following steps：
S100：Collection voltages Vs.
In the present embodiment, the voltage Vs represents the voltage of the output interface of low side drive circuit 200.
S101：Voltage comparator circuit 400 judges the size of voltage Vs and supply voltage, when voltage Vs=supply voltages,
Enter step S102；When voltage Vs ≠ supply voltage, S103 is entered step.
In this step, the supply voltage is signified for the magnitude of voltage of the power supply connected by driving load 100.
S102：Judging result is short power failure.
Under normal circumstances, by the both ends of driving load 100 there are pressure difference, and when equal by 100 both end voltage of driving load
When, i.e., voltage Vs=supply voltages when, then it represents that there is short power failure in the output port of low side drive circuit.
S103：Voltage comparator circuit 400 judges whether voltage Vs is 0, as voltage Vs=0, enters step S104；Work as electricity
When pressing Vs ≠ 0, S105 is entered step.
S104：Judging result is short earth fault.
Under normal circumstances, the output port of low side drive circuit and ground wire (0V) are there are pressure difference, and work as low side drive circuit
Output port voltage=0 when, then it represents that there is short earth fault in the output port of low side drive circuit.
S105：Voltage comparator circuit 400 judges the size of voltage Vs and branch pressure voltage, when voltage Vs=branch pressure voltages,
Enter step S106；When voltage Vs ≠ branch pressure voltage, represent that typical fault is not present in the output port of low side drive circuit.
S106：Judging result is open fault.
In the present embodiment, branch pressure voltage is expressed as V=Vref*R2/ (R1+R2), and Vref represents branch pressure voltage in formula, R1,
R2 represents the resistance value of first, second divider resistance (301,302) respectively.As voltage Vs=branch pressure voltage V, that is, represent that low side is driven
There is open circuit in the output port of dynamic circuit, therefore just detects branch pressure voltage.Thus, it is low side drive circuit that can determine failure
Output port open fault.In this step, by setting divider resistance so that its partial pressure effect with by branch pressure voltage with it is foregoing
Supply voltage is mutually distinguished, so as to just distinguish the defeated of low side drive circuit according to supply voltage numerical value different from branch pressure voltage
The different fault type of exit port.
Fault diagnosis circuit involved by the application can be applied to all kinds of low side driving output interface, especially MOS and directly drive
Or there is fault-free without in the chip drive circuit of fault diagnosis functions, enabling the system to accurately to grasp low side driving output interface
And which kind of failure, so as to perform corresponding strategy, improve the reliability of system.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all in this practicality
Within new spirit and principle, any modification, equivalent replacement, improvement and so on, should be included in the guarantor of the utility model
Within the scope of shield.
Claims (8)
1. a kind of fault diagnosis circuit of low side driving, is connected to power supply, other end connection is low by driving load (100) its one end
The output interface of side drive circuit (200), it is characterised in that fault diagnosis circuit includes：
The first divider resistance (301) and the second divider resistance (302) being connected in series between a reference voltage and ground wire, two institutes
The common port for stating divider resistance is connected to the output interface of the low side drive circuit (200)；
Voltage comparator circuit (400), its voltage receiving port are connected to the common port of two divider resistances.
2. circuit according to claim 1, it is characterised in that other voltages of the voltage comparator circuit (400) receive
Port of the port also with the power supply is connected.
3. circuit according to claim 2, it is characterised in that other voltages of the voltage comparator circuit (400) receive
Port is also connected with a 0V voltages.
4. according to any circuit of claims 1 to 3, it is characterised in that the voltage comparator circuit (400) is with interior
Put the microcontroller of A/D module.
5. circuit according to claim 3, it is characterised in that the voltage comparator circuit (400) includes plurality of voltages ratio
Compared with device, the one input end of each voltage comparator is connected to low side drive circuit output interface, each voltage comparator it is another
Input terminal connects the interface of the interface of supply voltage, the interface of reference voltage and 0 voltage respectively.
6. circuit according to claim 5, it is characterised in that further include input selection circuit, be connected to plurality of voltages ratio
On the circuit being connected compared with device with low side drive circuit output interface, the input selection circuit is used for according to each electricity of ordered pair when presetting
The input signal of pressure comparator makes choice.
7. the circuit according to claim 5 or 6, it is characterised in that further include wave filter, be connected to plurality of voltages comparator
On the circuit being connected with low side drive circuit output interface.
8. circuit according to claim 1, it is characterised in that warning circuit is further included, with the voltage comparator circuit
(400) output terminal connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721060626.7U CN207232324U (en) | 2017-08-23 | 2017-08-23 | A kind of fault diagnosis circuit of low side driving |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721060626.7U CN207232324U (en) | 2017-08-23 | 2017-08-23 | A kind of fault diagnosis circuit of low side driving |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207232324U true CN207232324U (en) | 2018-04-13 |
Family
ID=61858630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721060626.7U Expired - Fee Related CN207232324U (en) | 2017-08-23 | 2017-08-23 | A kind of fault diagnosis circuit of low side driving |
Country Status (1)
| Country | Link |
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| CN (1) | CN207232324U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813998A (en) * | 2019-01-14 | 2019-05-28 | 珠海格力电器股份有限公司 | A kind of digital equipment interface humidity detection circuit and terminal |
| CN110154941A (en) * | 2019-04-29 | 2019-08-23 | 惠州市德赛西威汽车电子股份有限公司 | A kind of band is accurately opened a way the low side driving circuit and its detection method of detection |
| CN112255937A (en) * | 2020-09-18 | 2021-01-22 | 惠州市德赛西威汽车电子股份有限公司 | Automobile combination instrument control circuit capable of detecting low-side load open circuit |
| WO2021036959A1 (en) * | 2019-08-30 | 2021-03-04 | 宁德时代新能源科技股份有限公司 | Detection circuit and detection method for electric control device, and electric car |
| WO2021036958A1 (en) * | 2019-08-30 | 2021-03-04 | 宁德时代新能源科技股份有限公司 | Detection circuit and detection method for electric control device, and electric car |
| US12025666B2 (en) | 2019-08-30 | 2024-07-02 | Contemporary Amperex Technology Co., Limited | Detection circuit and detection method of electrical control device, and electric vehicle |
-
2017
- 2017-08-23 CN CN201721060626.7U patent/CN207232324U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813998A (en) * | 2019-01-14 | 2019-05-28 | 珠海格力电器股份有限公司 | A kind of digital equipment interface humidity detection circuit and terminal |
| CN110154941A (en) * | 2019-04-29 | 2019-08-23 | 惠州市德赛西威汽车电子股份有限公司 | A kind of band is accurately opened a way the low side driving circuit and its detection method of detection |
| CN110154941B (en) * | 2019-04-29 | 2022-08-26 | 惠州市德赛西威汽车电子股份有限公司 | Low-side driving circuit with accurate open circuit detection and detection method thereof |
| WO2021036959A1 (en) * | 2019-08-30 | 2021-03-04 | 宁德时代新能源科技股份有限公司 | Detection circuit and detection method for electric control device, and electric car |
| WO2021036958A1 (en) * | 2019-08-30 | 2021-03-04 | 宁德时代新能源科技股份有限公司 | Detection circuit and detection method for electric control device, and electric car |
| US11435389B2 (en) | 2019-08-30 | 2022-09-06 | Contemporary Amperex Technology Co., Limited | Electrical control device detection circuit, detection method, and electric vehicle |
| US12025666B2 (en) | 2019-08-30 | 2024-07-02 | Contemporary Amperex Technology Co., Limited | Detection circuit and detection method of electrical control device, and electric vehicle |
| CN112255937A (en) * | 2020-09-18 | 2021-01-22 | 惠州市德赛西威汽车电子股份有限公司 | Automobile combination instrument control circuit capable of detecting low-side load open circuit |
| CN112255937B (en) * | 2020-09-18 | 2024-03-19 | 惠州市德赛西威汽车电子股份有限公司 | Automobile combination instrument control circuit capable of detecting low-side load open circuit |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180413 Termination date: 20200823 |
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| CF01 | Termination of patent right due to non-payment of annual fee |