CN206601436U - A kind of driving plate undervoltage detection circuit - Google Patents
A kind of driving plate undervoltage detection circuit Download PDFInfo
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- CN206601436U CN206601436U CN201720039891.0U CN201720039891U CN206601436U CN 206601436 U CN206601436 U CN 206601436U CN 201720039891 U CN201720039891 U CN 201720039891U CN 206601436 U CN206601436 U CN 206601436U
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Abstract
The utility model provides a kind of driving plate undervoltage detection circuit, including：The primary circuit and secondary circuit of driving chip, and the optocoupler being arranged between the primary circuit and the secondary circuit；The primary circuit is electrically connected with the first end of the optocoupler, and the second end of the optocoupler is electrically connected with the secondary circuit, and the optocoupler obtains the magnitude of voltage of the secondary circuit, and the single-chip microcomputer control source port fed back in the primary circuit.Driving plate undervoltage detection circuit provided by the utility model is isolated by optocoupler; the voltage signal of secondary circuit is fed back into primary circuit; the voltage of driving chip secondary circuit can be accurately detected in real time; and detect the problems such as judging whether to there occurs line under-voltage by detecting the voltage signal of secondary circuit; also can just accurately distinguish when breaking down protection is caused by short circuit or by under-voltage caused, so that processing is out of order side by side in time.
Description
Technical field
The utility model is related to automotive field, more particularly to a kind of driving plate undervoltage detection circuit.
Background technology
In current IGBT driving plates design, when there is the electricity shortage of driving chip secondary voltage or IGBT short circuits two occur
The situation of kind, can be alarmed by the FAULT level signals on driving chip source side, but controller can not judge to be due to under-voltage
Failure or short circuit is caused to produce failure, when analysis is solved the problems, such as, increase analysis workload, and waste solution problem time.
Utility model content
The utility model provides a kind of driving plate undervoltage detection circuit, and its purpose is to solve controller not judging
Cause the problem of failure or short circuit produce failure due to under-voltage.
In order to achieve the above object, embodiment of the present utility model provides a kind of driving plate undervoltage detection circuit, including：
The primary circuit and secondary circuit of driving chip, and be arranged between the primary circuit and the secondary circuit
Optocoupler；
The primary circuit is electrically connected with the first end of the optocoupler, the second end and the secondary circuit electricity of the optocoupler
Connection, the optocoupler obtains the magnitude of voltage of the secondary circuit, and the single-chip microcomputer control source fed back in the primary circuit
Port.
Wherein, the optocoupler is optocoupler.
Wherein, the standard voltage value of the secondary circuit is the first preset voltage value set by bleeder circuit.
Wherein, the secondary circuit includes：
Voltage output part, the output end of the voltage output part is electrically connected with the first end of first resistor, first electricity
Second end of resistance is electrically connected with the first end of the optocoupler；
Second end of the first resistor is also electrically connected with the first end of second resistance, the second end of the second resistance with
Second end of the optocoupler is electrically connected, and the second end of the second resistance and the input of the voltage output part are electrically connected
Connect.
Wherein, the primary circuit includes：
The optocoupler is electrically connected by the first capacitor with the single-chip microcomputer control source port；
Be provided with resistance between the 3rd end and the single-chip microcomputer control source port of the optocoupler, the resistance with
First capacitor is in parallel；
It is provided with an inductance between 4th end of the optocoupler and first capacitor, and the optocoupler
4th end is grounded by equipotential.
Wherein, the optocoupler is digital optocoupler.
Wherein, the secondary circuit includes：
Voltage output part, the output end of the voltage output part is electrically connected with the first end of first resistor, first electricity
Second end of resistance is electrically connected with the second capacitor first end；
Second end of second capacitor is electrically connected with the first end of the digital optocoupler, and the of second capacitor
Resistance is provided between the first end of two ends and the digital optocoupler；
Second end of the first resistor is also electrically connected with the first end of second resistance, the second end of the second resistance with
Second end of the digital optocoupler is electrically connected, and the second end of the second resistance and the input of the voltage output part are electrically connected
Connect.
Wherein, the primary circuit includes：
3rd end of the digital optocoupler is electrically connected with microcontroller power supply, and the 3rd end and the single-chip microcomputer of the digital optocoupler
Resistance is provided between power supply；
3rd end of the digital optocoupler is also electrically connected with single-chip microcomputer control source port, and the 3rd of the digital optocoupler the
End is also provided with resistance between single-chip microcomputer control source port；
4th end of the digital optocoupler is grounded by equipotential.
Wherein, the secondary circuit passes through ground wire grounded.
Such scheme of the present utility model has following beneficial effect：
Driving plate undervoltage detection circuit provided by the utility model is isolated by optocoupler, by the voltage of secondary circuit
Signal feeds back to primary circuit, and the voltage of driving chip secondary circuit can be accurately detected in real time, and by detecting secondary electricity
The voltage signal on road to detect the problems such as judging whether to there occurs line under-voltage, also can just accurately distinguish break down protection when
It is to be caused by short circuit or by under-voltage caused, so that processing is out of order side by side in time.
Brief description of the drawings
Fig. 1 is the circuit diagram of first embodiment of the present utility model；
Fig. 2 is the circuit diagram of second embodiment of the present utility model.
【Description of reference numerals】
1- voltage output parts；2- first resistors；3- second resistances；4- optocouplers；5- single-chip microcomputer control sources port；6-
First capacitor；7- inductance；8- equipotentials；9- numeral optocouplers；The capacitors of 10- second；11- microcontroller power supplies；12- ground wires.
Embodiment
To make the technical problems to be solved in the utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing
And specific embodiment is described in detail.
The utility model can not judge to cause failure or short circuit to produce asking for failure due to under-voltage for existing controller
There is provided a kind of driving plate undervoltage detection circuit for topic.
As depicted in figs. 1 and 2, embodiment of the present utility model provides a kind of driving plate undervoltage detection circuit, including：Drive
The primary circuit and secondary circuit of dynamic chip, and the optocoupler being arranged between the primary circuit and the secondary circuit；Institute
The first end that primary circuit is stated with the optocoupler is electrically connected, and the second end of the optocoupler is electrically connected with the secondary circuit, described
Optocoupler obtains the magnitude of voltage of the secondary circuit, and the single-chip microcomputer control source port 5 fed back in the primary circuit.
Driving plate undervoltage detection circuit described in above-described embodiment of the present utility model is isolated by optocoupler, by secondary
The voltage signal of circuit feeds back to primary circuit, the voltage of driving chip secondary circuit can be accurately detected in real time, and pass through
Detect the voltage signal of secondary circuit to detect the problems such as judging whether to there occurs line under-voltage, also can just accurately distinguish generation
It is to be caused by short circuit or by under-voltage caused during error protection, so that processing is out of order side by side in time.
As shown in figure 1, the optocoupler is optocoupler 4.
Wherein, the standard voltage value of the secondary circuit is the first preset voltage value set by bleeder circuit.
The real-time voltage value of secondary circuit described in above-described embodiment of the present utility model is less than the mark of the secondary circuit
During quasi- magnitude of voltage, the voltage signal for the single-chip microcomputer control source port 5 that the optocoupler 4 is fed back in the primary circuit subtracts
Small, the standard voltage value of the secondary circuit is set as 15V, is set and is arrived after suitable voltage range by bleeder circuit, passes through
After optocoupler 4, then single-chip microcomputer control source port 5 is sent to by one-level amplifier, when there are 15V voltage signals due to certain
When reason breaks down, there is saltus step in fault pin level, meanwhile, after the detection electric circuit inspection to 15V Voltage Drops, simulated light
The voltage signal step-down that coupling 4 is transmitted, voltage input levels reduce, and have reached the purpose of detection secondary voltage.
Wherein, the secondary circuit includes：Voltage output part 1, output end and the first resistor 2 of the voltage output part 1
First end electrical connection, the second end of the first resistor 2 is electrically connected with the first end of the optocoupler 4；First electricity
First end of second end of resistance 2 also with second resistance 3 is electrically connected, the second end of the second resistance 3 and the optocoupler 4
Second end is electrically connected, and the second end of the second resistance 3 is electrically connected with the input of the voltage output part 1.
Wherein, the primary circuit includes：The optocoupler 4 is defeated by the first capacitor 6 and the single-chip microcomputer voltage
Inbound port 5 is electrically connected；Resistance is provided between the 3rd end and the single-chip microcomputer control source port 5 of the optocoupler 4, institute
State resistance in parallel with first capacitor 6；It is provided between 4th end of the optocoupler 4 and first capacitor 6
One inductance 7, and the 4th end of the optocoupler 4 is grounded by equipotential 8.
As shown in Fig. 2 the optocoupler is digital optocoupler 9.
Wherein, the secondary circuit includes：Voltage output part 1, output end and the first resistor 2 of the voltage output part 1
First end electrical connection, the second end of the first resistor 2 is electrically connected with the first end of the second capacitor 10；Second capacitor
10 the second end is electrically connected with the first end of the digital optocoupler 9, the second end and the digital light of second capacitor 10
Resistance is provided between the first end of coupling 9；First end of second end of the first resistor 2 also with second resistance 3 is electrically connected, institute
The second end for stating second resistance 3 is electrically connected with the second end of the digital optocoupler 9, and the second end and the institute of the second resistance 3
State the input electrical connection of voltage output part 1.
Wherein, the primary circuit includes：3rd end of the digital optocoupler 9 is electrically connected with microcontroller power supply 11, and institute
State and be provided with resistance between the 3rd end of digital optocoupler 9 and microcontroller power supply 11；3rd end of the digital optocoupler 9 also with monolithic
Electromechanics pressure input port 5 is electrically connected, and the 3rd end of the digital optocoupler 9 is set also between single-chip microcomputer control source port 5
There is resistance；4th end of the digital optocoupler 9 is grounded by equipotential 8.
Optocoupler described in above-described embodiment of the present utility model can also be digital optocoupler 9, when the optocoupler is digital light
During coupling 9, the second capacitor 10 is provided with the secondary circuit, second capacitor 10 is pre-configured with a reference voltage level,
The reference voltage level and first preset voltage value the first predetermined voltage range of formation, the real-time voltage of the secondary circuit
Value is not in first predetermined voltage range, then data signal is sent to monolithic by output level saltus step by digital optocoupler 9
Machine is gone, and is easy to the capture operation of single-chip microcomputer, and the data signal of the real-time voltage value is fed back to the original by the digital optocoupler 9
Single-chip microcomputer control source port 5 on the circuit of side, triggers failure, and analyzing failure cause in real time.
Wherein, the secondary circuit is grounded by ground wire 12.
The secondary circuit of driving chip is equal in driving plate undervoltage detection circuit described in above-described embodiment of the present utility model
It is grounded by ground wire 12, and the primary circuit of the driving chip is grounded by equipotential 8；And isolated by optocoupler,
The voltage signal of secondary circuit is fed back into primary circuit, the voltage of driving chip secondary circuit can be accurately detected in real time,
And the problems such as judging whether to there occurs line under-voltage is detected by detecting the voltage signal of secondary circuit, also just being capable of accurate area
It is to be caused by short circuit or by under-voltage caused during distribution life error protection, so that processing is out of order side by side in time.
Described above is preferred embodiment of the present utility model, it is noted that for the ordinary skill of the art
For personnel, on the premise of principle described in the utility model is not departed from, some improvements and modifications can also be made, these improvement
Protection domain of the present utility model is also should be regarded as with retouching.
Claims (9)
1. a kind of driving plate undervoltage detection circuit, it is characterised in that including：
The primary circuit and secondary circuit of driving chip, and the light being arranged between the primary circuit and the secondary circuit
Coupling；
The primary circuit is electrically connected with the first end of the optocoupler, and the second end and the secondary circuit of the optocoupler are electrically connected
Connect, the optocoupler obtains the magnitude of voltage of the secondary circuit, and the single-chip microcomputer voltage input end fed back in the primary circuit
Mouthful.
2. driving plate undervoltage detection circuit according to claim 1, it is characterised in that the optocoupler is optocoupler.
3. driving plate undervoltage detection circuit according to claim 2, it is characterised in that the normal voltage of the secondary circuit
Value is the first preset voltage value set by bleeder circuit.
4. driving plate undervoltage detection circuit according to claim 3, it is characterised in that the secondary circuit includes：
Voltage output part, the output end of the voltage output part is electrically connected with the first end of first resistor, the first resistor
Second end is electrically connected with the first end of the optocoupler；
Second end of the first resistor is also electrically connected with the first end of second resistance, the second end of the second resistance with it is described
Second end of optocoupler is electrically connected, and the second end of the second resistance is electrically connected with the input of the voltage output part.
5. driving plate undervoltage detection circuit according to claim 4, it is characterised in that the primary circuit includes：
The optocoupler is electrically connected by the first capacitor with the single-chip microcomputer control source port；
Be provided with resistance between the 3rd end and the single-chip microcomputer control source port of the optocoupler, the resistance with it is described
First capacitor is in parallel；
An inductance, and the 4th of the optocoupler the are provided between 4th end of the optocoupler and first capacitor
End is grounded by equipotential.
6. driving plate undervoltage detection circuit according to claim 1, it is characterised in that the optocoupler is digital optocoupler.
7. driving plate undervoltage detection circuit according to claim 6, it is characterised in that the secondary circuit includes：
Voltage output part, the output end of the voltage output part is electrically connected with the first end of first resistor, the first resistor
Second end is electrically connected with the second capacitor first end；
Second end of second capacitor is electrically connected with the first end of the digital optocoupler, the second end of second capacitor
Resistance is provided between the first end of the digital optocoupler；
Second end of the first resistor is also electrically connected with the first end of second resistance, the second end of the second resistance with it is described
Second end of digital optocoupler is electrically connected, and the second end of the second resistance is electrically connected with the input of the voltage output part.
8. driving plate undervoltage detection circuit according to claim 7, it is characterised in that the primary circuit includes：
3rd end of the digital optocoupler is electrically connected with microcontroller power supply, and the 3rd end and the microcontroller power supply of the digital optocoupler
Between be provided with resistance；
3rd end of the digital optocoupler is also electrically connected with single-chip microcomputer control source port, and the digital optocoupler the 3rd end also
Resistance is provided between single-chip microcomputer control source port；
4th end of the digital optocoupler is grounded by equipotential.
9. the driving plate undervoltage detection circuit according to claim 4 or 7, it is characterised in that the secondary circuit passes through ground
Line is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720039891.0U CN206601436U (en) | 2017-01-13 | 2017-01-13 | A kind of driving plate undervoltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720039891.0U CN206601436U (en) | 2017-01-13 | 2017-01-13 | A kind of driving plate undervoltage detection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206601436U true CN206601436U (en) | 2017-10-31 |
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ID=60149237
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720039891.0U Active CN206601436U (en) | 2017-01-13 | 2017-01-13 | A kind of driving plate undervoltage detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107733251A (en) * | 2017-11-14 | 2018-02-23 | 黄善兵 | Super-low standby power consumption power supply wake-up control method |
| WO2022002000A1 (en) * | 2020-06-30 | 2022-01-06 | 比亚迪半导体股份有限公司 | Undervoltage protection circuit and device |
-
2017
- 2017-01-13 CN CN201720039891.0U patent/CN206601436U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107733251A (en) * | 2017-11-14 | 2018-02-23 | 黄善兵 | Super-low standby power consumption power supply wake-up control method |
| WO2022002000A1 (en) * | 2020-06-30 | 2022-01-06 | 比亚迪半导体股份有限公司 | Undervoltage protection circuit and device |
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