CN207488360U - A kind of light-coupled isolation overvoltage detection circuit of vehicle power supply - Google Patents
A kind of light-coupled isolation overvoltage detection circuit of vehicle power supply Download PDFInfo
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- CN207488360U CN207488360U CN201721328042.3U CN201721328042U CN207488360U CN 207488360 U CN207488360 U CN 207488360U CN 201721328042 U CN201721328042 U CN 201721328042U CN 207488360 U CN207488360 U CN 207488360U
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Abstract
The utility model is related to voltage detecting technical fields; specifically disclose a kind of light-coupled isolation overvoltage detection circuit of vehicle power supply; chip power supply power supply is also connected with equipped with partial pressure sub-circuit, voltage-stabilizing protection sub-circuit, light-coupled isolation sub-circuit and filtering sub-circuit, the light-coupled isolation sub-circuit being linked in sequence between the power output end of the vehicle power supply and the voltage detecting end of vehicle-mounted MCU.A kind of light-coupled isolation overvoltage detection circuit of vehicle power supply provided by the utility model; by the way of electric resistance partial pressure; isolation sampling is carried out by photoelectrical coupler; when the voltage of detection is more than setting value, the common voltage that signal is fed back to vehicle-mounted MCU by photoelectrical coupler detects port, compared to the prior art; can detection not altogether, the over-pressed signal of high voltage; sampling and protection are accurate much sooner, while improve the antijamming capability of overvoltage protection, reduce the occurrence of accidentally protecting.
Description
Technical field
The utility model is related to voltage detecting technical fields more particularly to a kind of light-coupled isolation overvoltage of vehicle power supply to examine
Slowdown monitoring circuit.
Background technology
At present, in automobile electronic system, many places need to use overvoltage detection circuit, for example, compressor, motor,
Air blower etc., it is by after electric resistance partial pressure, being carried out by analog port, corresponding voltage being further obtained usually to detect voltage
Value, and then judges whether overvoltage, as shown in Fig. 1 in Figure of description, using vehicle-mounted MCU (Micro Control Unit, it is micro-
Control unit) an analog port MCU_AD, the partial pressure of sampling resistor R11 and R12, and then judge whether overvoltage, wherein electricity
The RC resistance-capacitance circuits that R13 and capacitance C11 is analog port MCU_AD are hindered, POWER is the power output end of the vehicle power supply.
But such design is there are drawback, such as Fig. 1 circuits because power supply GND voltage deviation, detect overpressure conditions
In need to carry out carrying out the reasons such as over-pressed judgement again after analog port detection calculates, cause partial pressure sampling inaccurate, simultaneously for
The voltage detecting of high current, the poor anti jamming capability of the voltage detecting circuit of electric resistance partial pressure combination analog port, it is impossible to which detection is not
Altogether, the over-pressed signal of high voltage, samples and protects not prompt enough accurate, and accidentally protection occurs once in a while.
Invention content
A kind of the technical issues of light-coupled isolation overvoltage detection circuit of vehicle power supply of the utility model offer, solution, electricity
Resistance partial pressure with reference to analog port voltage detecting circuit poor anti jamming capability, it is impossible to detection not altogether, high voltage overvoltage letter
Number, it samples and protects not prompt enough accurate, accidentally protection occurs once in a while.
For solution more than technical problem, the utility model provides a kind of light-coupled isolation Zenith tracking electricity of vehicle power supply
Road, equipped with the partial pressure son electricity being linked in sequence between the power output end of the vehicle power supply and the voltage detecting end of vehicle-mounted MCU
Road, voltage-stabilizing protection sub-circuit, light-coupled isolation sub-circuit and filtering sub-circuit, the light-coupled isolation sub-circuit are also connected with chip power supply
Power supply.
Further, the partial pressure sub-circuit is equipped with first be sequentially connected in series between the power output end and the first ground
Divider resistance, the second divider resistance and third divider resistance.
Further, the voltage-stabilizing protection sub-circuit is equipped with the first filtering for being connected in parallel on the second divider resistance both ends
Capacitance and zener diode, and first filter capacitor and the zener diode are in parallel, the zener diode reversely connects
It is connected on first divider resistance and the common connection end of second divider resistance composition and second divider resistance and institute
Between the common connection end for stating third divider resistance composition.
Further, the light-coupled isolation sub-circuit is equipped with photoelectrical coupler and pull-up resistor；The photoelectrical coupler
Diode cathode end connect the common connection end of first divider resistance and second divider resistance, diode cathode end
The common connection end of second divider resistance and the third divider resistance is connected, transistor collector end connects the filtering
The signal input part of sub-circuit, ground terminal of the triode emission extremely with the filtering sub-circuit connect the second ground jointly, described
Pull-up resistor is connected between the transistor collector end and the chip power supply power supply.
Further, the filtering sub-circuit is equipped with filter resistance and the second filter capacitor；The filter resistance connection
Between the transistor collector end and the voltage detecting end of the vehicle-mounted MCU, second filter capacitor is connected to described
Between voltage detecting end and second ground.
First ground and second ground are for identical ground or differently.
Preferably, the chip power supply power supply be the vehicle-mounted MCU power supply, output voltage for+5V or+
3.3V。
Specifically, the power output end output voltage of the vehicle power supply is+48V ,+24V or+12V.
The light-coupled isolation overvoltage detection circuit of a kind of vehicle power supply provided by the utility model, using the side of electric resistance partial pressure
Formula carries out isolation sampling by photoelectrical coupler, and when the voltage of detection is more than setting value, photoelectrical coupler feeds back to signal
The common voltage detection port of vehicle-mounted MCU.Compared to the prior art, can detect not altogether, the over-pressed signal of high voltage, sampling and
Protection is accurate much sooner, while improves the antijamming capability of overvoltage protection, reduces the occurrence of accidentally protecting.
Description of the drawings
Fig. 1 is the electrical connection diagram for the existing car power supply voltage detection circuit that the utility model embodiment provides；
Fig. 2 is a kind of light-coupled isolation overvoltage detection circuit access electricity for vehicle power supply that the utility model embodiment provides
The electrical connection diagram on road.
Specific embodiment
The embodiment of the utility model is specifically illustrated below in conjunction with the accompanying drawings, and embodiment is only given in order to illustrate mesh
, the restriction to the utility model can not be interpreted as, type selecting and value size and attached drawing including component are only preferably real
Apply example, it is only for reference and illustrate to use, the limitation to the utility model patent protection domain is not formed, because not departing from this reality
On the basis of novel spirit and scope, many changes can be carried out to the utility model.
A kind of light-coupled isolation overvoltage detection circuit access circuit for vehicle power supply that the utility model embodiment provides
Electrical connection diagram, as shown in Fig. 2, in the present embodiment, the light-coupled isolation overvoltage detection circuit of a kind of vehicle power supply, equipped with suitable
Sequence is connected to the partial pressure son electricity between the voltage detecting end MCU_V of the power output end POWER and vehicle-mounted MCU of the vehicle power supply
Road 1, voltage-stabilizing protection sub-circuit 2, light-coupled isolation sub-circuit 3 and filtering sub-circuit 4, the light-coupled isolation sub-circuit 3 are also connected with core
Piece power supply VCC.
As shown in Fig. 2, the partial pressure sub-circuit 1 is equipped with and is sequentially connected in series on the power output end POWER and the first ground
The first divider resistance R1, the second divider resistance R2 and third divider resistance R3 between GND1.
The voltage-stabilizing protection sub-circuit 2 be equipped be connected in parallel on the second divider resistance R2 both ends the first filter capacitor C1 and
Zener diode D1, and the first filter capacitor C1 and zener diode D1 is in parallel, the zener diode D1 is reversed
It is connected to the common connection end and the described second partial pressure electricity of the first divider resistance R1 and the second divider resistance R2 compositions
Between the common connection end for hindering R2 and third divider resistance R3 compositions.
The light-coupled isolation sub-circuit 3 is equipped with photoelectrical coupler U1 and pull-up resistor R4；The two of the photoelectrical coupler U1
Pole pipe positive terminal U1_PIN1 (PIN represents pin, for example PIN1 represents pin 1, similarly hereinafter) connection the first divider resistance R1 with
The common connection end of the second divider resistance R2, diode cathode end U1_PIN2 connections the second divider resistance R2 and institute
The common connection end of third divider resistance R3 is stated, the signal of the transistor collector end U1_PIN3 connections filtering sub-circuit 4 is defeated
Enter end, the extreme U1_PIN4 of triode emission connect the second ground GND2 jointly with the ground terminal of the filtering sub-circuit 4, it is described on
Pull-up resistor R4 is connected between the transistor collector end U1_PIN3 and the chip power supply power supply VCC.Two pole of voltage stabilizing
Pipe D1 makees reversed voltage-stabilizing protection for photoelectrical coupler U1, according to different occasions and the corresponding suitable value of performance selection.
The filtering sub-circuit 4 is equipped with filter resistance R5 and the second filter capacitor C2；The filter resistance R5 is connected to institute
It states between transistor collector end U1_PIN3 and the voltage detecting end MCU_V of the vehicle-mounted MCU, the second filter capacitor C2
It is connected between the voltage detecting end MCU_V and the second ground GND2.
The first ground GND1 and the second ground GND2 are for identical ground or differently, in order to improve excess voltage detection signal
Antijamming capability, be usually arranged as different ground.
Preferably, the chip power supply power supply VCC be the vehicle-mounted MCU power supply, output voltage for+5V or+
3.3V。
Specifically, the power output end POWER output voltages of the vehicle power supply are+48V ,+24V or+12V.
The voltage of the power output end POWER of the vehicle power supply is by the first sampling resistor, the second sampling resistor, third
Sampling resistor divides, wherein the voltage of second sampling resistor corresponds to the voltage at photoelectrical coupler U1 both ends.When described vehicle-mounted
When the power output end POWER of power supply is in overvoltage, photoelectrical coupler U1 reaches the critical point of conducting, and photoelectrical coupler U1 will
The voltage that the left side of the filter resistance R5 flows into is become low level signal by the signal of overvoltage, by the filter resistance R5
After the filtering sub-circuit 4 formed with the second filter capacitor C2, voltage detecting end MCU_V (common port) inspections through vehicle-mounted MCU
Measure overvoltage electric signal；When the power output end POWER of the vehicle power supply is not on overvoltage condition, photoelectrical coupler
U1 is not turned on, and the voltage detecting end MCU_V of vehicle-mounted MCU is consistent to keep high level shape because the pull-up level of resistance R4 acts on
State.
The light-coupled isolation overvoltage detection circuit for a kind of vehicle power supply that the utility model embodiment provides, using resistance point
The mode of pressure carries out isolation sampling by photoelectrical coupler U1, and when the voltage of detection is more than setting value, photoelectrical coupler U1 will
Signal feeds back to MCU_V mouthfuls of the common voltage test side of vehicle-mounted MCU.Compared to the prior art, can detect not altogether, high voltage
Over-pressed signal, sampling and protection are accurate much sooner, while improve the antijamming capability of overvoltage protection, reduce and miss protection situation
Occur.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiment of the utility model is not by above-mentioned
The limitation of embodiment, the change made under other any Spirit Essences and principle without departing from the utility model are modified, are replaced
In generation, simplifies combination, should be equivalent substitute mode, is included within the scope of protection of the utility model.
Claims (8)
1. the light-coupled isolation overvoltage detection circuit of a kind of vehicle power supply, which is characterized in that equipped with being linked in sequence described vehicle-mounted
Partial pressure sub-circuit, voltage-stabilizing protection sub-circuit between the power output end of power supply and the voltage detecting end of vehicle-mounted MCU, light-coupled isolation
Sub-circuit and filtering sub-circuit, the light-coupled isolation sub-circuit are also connected with chip power supply power supply.
2. a kind of light-coupled isolation overvoltage detection circuit of vehicle power supply as described in claim 1, it is characterised in that：Described point
Pressure sub-circuit be equipped be sequentially connected in series the first divider resistance between the power output end and the first ground, the second divider resistance and
Third divider resistance.
3. a kind of light-coupled isolation overvoltage detection circuit of vehicle power supply as claimed in claim 2, it is characterised in that：It is described steady
Pressure protection sub-circuit, which is equipped with, is connected in parallel on first filter capacitor and zener diode at the second divider resistance both ends, and described the
One filter capacitor and the zener diode are in parallel, and the zener diode Opposite direction connection is in first divider resistance and described
The common connection end of second divider resistance composition connects jointly with what second divider resistance and the third divider resistance formed
It connects between end.
4. a kind of light-coupled isolation overvoltage detection circuit of vehicle power supply as claimed in claim 3, it is characterised in that：The light
Coupling isolation sub-circuit is equipped with photoelectrical coupler and pull-up resistor；The diode cathode end connection described first of the photoelectrical coupler
The common connection end of divider resistance and second divider resistance, diode cathode end connect second divider resistance with it is described
The common connection end of third divider resistance, the signal input part of the transistor collector end connection filtering sub-circuit, triode
Emitter terminal connect the second ground jointly with the ground terminal of the filtering sub-circuit, and the pull-up resistor is connected to the triode collection
Between electrode tip and the chip power supply power supply.
5. a kind of light-coupled isolation overvoltage detection circuit of vehicle power supply as claimed in claim 4, it is characterised in that：The filter
Marble circuit is equipped with filter resistance and the second filter capacitor；The filter resistance is connected to the transistor collector end and described
Between the voltage detecting end of vehicle-mounted MCU, second filter capacitor is connected between the voltage detecting end and second ground.
6. a kind of light-coupled isolation overvoltage detection circuit of vehicle power supply as claimed in claim 5, it is characterised in that：Described
One ground and second ground are for identical ground or differently.
7. a kind of light-coupled isolation overvoltage detection circuit of vehicle power supply as described in claim 1, it is characterised in that：The core
Piece power supply is the power supply of the vehicle-mounted MCU, and output voltage is+5V or+3.3V.
8. a kind of light-coupled isolation overvoltage detection circuit of vehicle power supply as described in claim 1, it is characterised in that：The vehicle
The power output end output voltage for carrying power supply is+48V ,+24V or+12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721328042.3U CN207488360U (en) | 2017-10-16 | 2017-10-16 | A kind of light-coupled isolation overvoltage detection circuit of vehicle power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721328042.3U CN207488360U (en) | 2017-10-16 | 2017-10-16 | A kind of light-coupled isolation overvoltage detection circuit of vehicle power supply |
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| Publication Number | Publication Date |
|---|---|
| CN207488360U true CN207488360U (en) | 2018-06-12 |
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ID=62480343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721328042.3U Active CN207488360U (en) | 2017-10-16 | 2017-10-16 | A kind of light-coupled isolation overvoltage detection circuit of vehicle power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963971A (en) * | 2018-09-25 | 2018-12-07 | 希格斯动力科技（珠海）有限公司 | Protection circuit for power panel |
| CN112909897A (en) * | 2020-11-23 | 2021-06-04 | 宁波市芯能微电子科技有限公司 | Battery management protection system of pruning machine |
| CN117805474A (en) * | 2024-03-01 | 2024-04-02 | 珠海泰坦科技股份有限公司 | Passive direct-current overvoltage isolation detection circuit |
-
2017
- 2017-10-16 CN CN201721328042.3U patent/CN207488360U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963971A (en) * | 2018-09-25 | 2018-12-07 | 希格斯动力科技（珠海）有限公司 | Protection circuit for power panel |
| CN108963971B (en) * | 2018-09-25 | 2024-03-19 | 佳木斯市奥义智能科技有限公司 | Protection circuit for power panel |
| CN112909897A (en) * | 2020-11-23 | 2021-06-04 | 宁波市芯能微电子科技有限公司 | Battery management protection system of pruning machine |
| CN117805474A (en) * | 2024-03-01 | 2024-04-02 | 珠海泰坦科技股份有限公司 | Passive direct-current overvoltage isolation detection circuit |
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