CN206922415U - A kind of under-voltage protecting circuit of onboard system, auto meter and vehicle - Google Patents
A kind of under-voltage protecting circuit of onboard system, auto meter and vehicle Download PDFInfo
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- CN206922415U CN206922415U CN201720214452.9U CN201720214452U CN206922415U CN 206922415 U CN206922415 U CN 206922415U CN 201720214452 U CN201720214452 U CN 201720214452U CN 206922415 U CN206922415 U CN 206922415U
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Abstract
The utility model is applied to electronic applications, there is provided a kind of under-voltage protecting circuit of onboard system, auto meter and vehicle, the circuit include：Filter unit, the input of filter unit are connected with automobile storage battery；Voltage comparison unit, voltage comparison unit include a positive feedback loop, have hysteretic characteristic, and the input of voltage comparison unit and the output end of filter unit connect；Voltage detection unit, the input of voltage detection unit and the output end of filter unit connect；Processing unit, the first input end of processing unit and the output end of voltage comparison unit are connected, and the second input of processing unit and the output end of voltage detection unit are connected, and the output end of processing unit is connected with onboard system power supply.The utility model realizes under-voltage protection and the voltage management to power supply only with the common devices of a comparator and a small amount of low cost, and circuit is simple, product design and development efficiency high, and cost is low.
Description
Technical field
The utility model belongs to electronic applications, more particularly to a kind of under-voltage protecting circuit of onboard system, auto meter and
Vehicle.
Background technology
With the development of electronic information technology of new generation, embedded system technology causes increasing intelligent terminal to interconnect
Intercommunication, electronic system integrated level also more and more higher.But line voltage is unstable, one can be caused to the normal work of electronic product
Fixed influence.Moreover different electronic product normal working voltage scopes are not quite similar, and this is just to each mould in electronic product system
Voltage management and protection between block propose urgent demand.Especially in the full liquid crystal combination instrument based on vehicle-mounted TFT-LCD
The circuit module being related in table is more, and the normal working voltage scope of modules is not quite similar.The circuit module wherein having,
Have strict requirements to the size of voltage, precision and the sequential that powers on/off, in order to ensure in-vehicle electronic system can stablize, can
The work leaned on, so as to the management to vehicle-mounted full liquid crystal instrument system power supply, particularly under-voltage protection, over-voltage protecting function proposes
Urgent demand.
It is so-called under-voltage, refer to that supply voltage is less than the voltage of system worked well.Under-voltage operation, is likely to result in Department of Electronics
Function of uniting is lost, in some instances it may even be possible to causes the component damage in system.So it is a kind of reliable under-voltage guarantor of electronic system design
Protection circuit is imperative.
Existing under-voltage protecting circuit, a kind of is to utilize the saturation conduction of several triodes or metal-oxide-semiconductor, saturation cut-off two
Kind state, coordinates some resistor voltage divider circuits, realizes the under-voltage protection function of electronic product.But this mode is due to triode
In addition to saturation conduction, saturation cut-off two states, it can also enter the state of amplification region.Triode once enters amplification region, when
After voltage between collector and emitter is more than certain numerical value, collector current linearly changes with base current.Under-voltage
Near rotection thresholds voltage, the small change of voltage between base stage and emitter stage, the collector voltage hair of pull-up may be caused
Raw lasting change.Now, single-chip microcomputer can not judge the level state of this voltage, i.e., the under-voltage protection threshold range of this circuit compared with
Greatly, protection precision is not high enough, also, the threshold voltage between transistor base and emitter stage is easily by extraneous factors such as temperature
Influence.When the operating ambient temperature residing for product changes greatly, transistor circuit under-voltage protection threshold value also and then changes, and protects
Protection circuit output is unstable, and this can be such that the function of product is constantly restarted by certain influence, such as system, cause circuit reliable
Property is poor.
Another kind is by the way of the cascade of multiple voltage comparators, NAND gate chip or error amplifier, by sampling electricity
Pressure and reference voltage make comparisons, comparator output level state according to the change of in-phase input end and inverting input difference and
Upset, so as to have the function that enabled or close supply voltage.But this mode due to using substantial amounts of voltage comparator,
NAND gate chip or the mode of error amplifier cascade, therefore the difficulty of product design is added, reduce the effect of product development
Rate, and the chip price such as error amplifier is high, and usage quantity can excessively cause product cost high, be unfavorable for market competition.
Utility model content
The purpose of the utility model embodiment is to provide a kind of under-voltage protecting circuit of onboard system, it is intended to solves existing
The problem of under-voltage protecting circuit precision is low, and poor reliability and circuit are complicated, and cost is high.
The utility model embodiment is achieved in that a kind of under-voltage protecting circuit of onboard system, is connected to automobile storage
Between battery and onboard system power supply, the circuit includes：
Input voltage is filtered, considers the filter unit except interference signal and high-frequency noise, the filter unit
Input is connected with the automobile storage battery；
By filtered input voltage compared with reference voltage, the voltage comparison unit of voltage comparison signal is generated, it is described
Voltage comparison unit includes a positive feedback loop, has hysteretic characteristic, the input of the voltage comparison unit and the filter
The output end connection of ripple unit；
Partial pressure detection is carried out to filtered input voltage, generates the voltage detection unit of voltage detection signal, the electricity
The input of pressure detection unit is connected with the output end of the filter unit；
Input voltage is passed to by onboard system power supply according to voltage comparison signal and voltage detection signal, and when under-voltage
The processing unit of power supply output is closed, the output end of the first input end of the processing unit and the voltage comparison unit connects
Connect, the second input of the processing unit is connected with the output end of the voltage detection unit, the output of the processing unit
End is connected with the onboard system power supply.
Further, the filter unit includes：
Electric capacity C1, electric capacity C2 and magnetic bead；
One end of the magnetic bead is the input of the filter unit while one end with the electric capacity C1, the electric capacity C2
Connection, the electric capacity C1, the other end of the electric capacity C2 are grounded simultaneously, and the other end of the magnetic bead is the defeated of the filter unit
Go out end.
Further, the magnetic bead is ferrite bean.
Further, the voltage comparison unit includes：
Resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C3, electric capacity C4, electric capacity C5 and compare
Device；
One end of the resistance R1 is the input of the voltage comparison unit, the other end of the resistance R1 and the ratio
Inverting input compared with device connects, the inverting input of the comparator also one end with the electric capacity C3, the resistance simultaneously
R2 one end connection, the other end of the electric capacity C3, the other end of the resistance R2 be grounded simultaneously, one end of the resistance R3 with
One end of the resistance R6 is connected with supply voltage simultaneously, the other end of the resistance R3 and the in-phase input end of the comparator
Connection, the in-phase input end of the comparator are also grounded by the resistance R4, the in-phase input end of the comparator also with institute
State resistance R5 one end connection, the output end of the comparator for the voltage comparison unit output end simultaneously with the resistance
The R5 other end is connected with the other end of the resistance R6, and the power end of the comparator is connected with supply voltage, the comparison
The power end of device is also grounded by the electric capacity C4, the earth terminal ground connection of the comparator, and the output end of the comparator is also logical
Cross the electric capacity C5 ground connection.
Further, the comparator is LM2903 type comparable chips.
Further, the voltage detection unit includes：
Resistance R7, resistance R8 and electric capacity C6；
One end of the resistance R7 is the input of the voltage detection unit, and the other end of the resistance R7 is the electricity
The output end of detection unit is pressed to be connected simultaneously with one end of the resistance R8 and one end of the electric capacity C6, the resistance R8's is another
One end and the electric capacity C6 other end are grounded simultaneously.
Further, the processing unit is single-chip microcomputer.
Further, the ground in the filter unit is the first ground potential, and the voltage comparison unit, the voltage are examined
The ground surveyed in unit is the second ground potential, is connected between the first ground voltage and the second ground voltage by common mode inductance.
The another object of the utility model embodiment is, there is provided a kind of under-voltage protecting circuit for including above-mentioned onboard system
Auto meter.
The another object of the utility model embodiment is, there is provided a kind of vehicle for including above-mentioned auto meter.
The utility model embodiment is realized to power supply only with the common devices of a comparator and a small amount of low cost
Under-voltage protection and voltage management, circuit is simple, product design and development efficiency high, and cost is low.
Brief description of the drawings
Fig. 1 is the structure chart of the under-voltage protecting circuit for the onboard system that the utility model embodiment provides；
The exemplary circuit of filter unit in the under-voltage protecting circuit for the onboard system that Fig. 2 provides for the utility model embodiment
Figure；
The example of voltage comparison unit in the under-voltage protecting circuit for the onboard system that Fig. 3 provides for the utility model embodiment
Circuit diagram；
The example of voltage detection unit in the under-voltage protecting circuit for the onboard system that Fig. 4 provides for the utility model embodiment
Circuit diagram.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.In addition, institute in each embodiment of the utility model disclosed below
As long as the technical characteristic being related to does not form conflict each other, can is mutually combined.
The utility model embodiment is realized to power supply only with the common devices of a comparator and a small amount of low cost
Under-voltage protection and voltage management, circuit is simple, product design and development efficiency high, and cost is low.
Fig. 1 shows the structure of the under-voltage protecting circuit for the onboard system that the utility model embodiment provides, for the ease of
Illustrate, illustrate only the part related to the utility model.
As the embodiment of the utility model one, the under-voltage protecting circuit of the onboard system can apply to various in vehicle
In electronic system, it is particularly suitable for use in full liquid crystal instrument system, the under-voltage protecting circuit of the onboard system is connected to automobile electric power storage
Between pond 3 and onboard system power supply 2, including：
Filter unit 11, for being filtered to input voltage V0, worry removes interference signal and high-frequency noise, filter unit
11 input is connected with automobile storage battery 3；
Voltage comparison unit 12, for compared with reference voltage, generation voltage ratio relatively to be believed by filtered input voltage vin
Number Vout, voltage comparison unit 12 include a positive feedback loop, have a hysteretic characteristic, the input of voltage comparison unit 12 with
The output end connection of filter unit 11；
Voltage detection unit 13, for carrying out partial pressure detection to filtered input voltage vin, generate voltage detection signal
AD1, the input of voltage detection unit 13 are connected with the output end of filter unit 11；
Processing unit 14, for input voltage to be passed into onboard system according to voltage comparison signal and voltage detection signal
Power supply, and power supply output is closed when under-voltage, so as to realize under-voltage protection, the first input end of processing unit 14 and voltage ratio compared with
The output end connection of unit 12, the second input of processing unit 14 are connected with the output end of voltage detection unit 13, and processing is single
The output end of member 14 is connected with onboard system power supply 2.
In the utility model embodiment, believe because the voltage in automobile storage battery is not sufficiently stable, and containing more interference
Number, therefore the input voltage that filter unit 11 is provided automobile storage battery first is filtered, and considers the outside removed in input voltage
Interference signal, particularly high-frequency noise, effectively prevent input voltage frequent fluctuation and external interference signals from influenceing the normal of voltage
Acquisition testing；
The hysteretic characteristic that positive feedback loop in voltage comparison unit 12 has, pass through corresponding two differences on hysteresis loop
Threshold value form certain amount of hysteresis, in input voltage raising and lowering, prevent input voltage from causing near brownout threshold
The problem of output vibration, ensure the validity and accuracy of the detection of AD collection voltages；
Voltage detection unit 13 can set the threshold voltage and under-voltage protection threshold voltage of power supply, more single with reference to voltage ratio
Two threshold voltages of member 12, ensure that AD collections are effective, make processing unit 14 realize the numerical value of collection input voltage V0 in real time to
Vehicle power 2, and protected power supply is closed when under-voltage.
The utility model embodiment is realized to power supply only with the common devices of a comparator and a small amount of low cost
Under-voltage protection and voltage management, circuit is simple, product design and development efficiency high, and cost is low.
Fig. 2 show the utility model embodiment provide onboard system under-voltage protecting circuit in filter unit example
Circuit structure, for convenience of description, it illustrate only the part related to the utility model.
As the embodiment of the utility model one, filter unit 11 includes：
Electric capacity C1, electric capacity C2 and magnetic bead FB1；
Magnetic bead FB1 one end is the input of filter unit 11, and the magnetic bead FB1 other end is the output end of filter unit 11
It is connected simultaneously with electric capacity C1, electric capacity C2 one end, electric capacity C1, the electric capacity C2 other end are grounded simultaneously.
In the utility model embodiment, the ground in filter unit 11 is the first ground potential.
Preferably, magnetic bead FB1 is ferrite bean, and ferrite bean can filter out high-frequency noise, but to low-frequency current
Impedance can be ignored.
In the utility model embodiment, electric capacity C1, electric capacity C2 and magnetic bead FB1 are filtered to input voltage, and worry removes
External interference signals in input voltage, particularly high-frequency noise, effectively prevent input voltage frequent fluctuation and external disturbance from believing
Number influence voltage normal acquisition detection.
Fig. 3 shows voltage comparison unit in the under-voltage protecting circuit of the onboard system that the utility model embodiment provides
Exemplary circuit structure, for convenience of description, it illustrate only the part related to the utility model.
As the embodiment of the utility model one, voltage comparison unit 12 includes：
Resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C3, electric capacity C4, electric capacity C5 and compare
Device U1A；
Resistance R1 one end is the input of voltage comparison unit 1212, and the resistance R1 other end is anti-with comparator U1A's
Phase input is connected, and comparator U1A inverting input is also connected with electric capacity C3 one end, resistance R2 one end simultaneously, electric capacity
The C3 other end, the resistance R2 other end is grounded simultaneously, and resistance R3 one end and resistance R6 one end connect with supply voltage simultaneously
Connect, the resistance R3 other end is connected with comparator U1A in-phase input end, and comparator U1A in-phase input end also passes through resistance
R4 is grounded, and the one end of comparator U1A in-phase input end also with resistance R5 be connected, comparator U1A output end be voltage ratio compared with
The output end of unit 1212 be connected with the resistance R5 other end and the resistance R6 other end simultaneously, comparator U1A power end and
Supply voltage is connected, and comparator U1A power end is also grounded by electric capacity C4, comparator U1A earth terminal ground connection, comparator
U1A output end is also grounded by electric capacity C5.
In the utility model embodiment, the ground of voltage comparison unit 12 is the second ground potential, the first ground voltage and second
Connected between ground voltage by common mode inductance.
In the utility model embodiment, comparator U1A inverting input receives a sampled voltage V-, sampling electricity
Press V- by filtered input voltage vin by resistance R1, resistance R2 partial pressures, and filter to obtain by electric capacity C3；Comparator U1A
In-phase input end connect a reference voltage V+, the reference voltage V+by supply voltage VCC by resistance R3, resistance R4 partial pressures
Obtain, wherein resistance R3 is connected to power supply VCC, and power supply VCC is after electric capacity C4 filtering, the power supply electricity as comparator U1A
Source；Comparator U1A output end is pulled upward to power supply VCC by electric capacity C5 filtering, resistance R6.
When input voltage vin increases to a certain numerical value, sampled voltage V- be more than reference voltage V+, comparator output terminal become
For low level；When input voltage vin drops to a certain numerical value, sampled voltage V- be less than reference voltage V+, because comparator is defeated
Go out end and VCC is pulled upward to by resistance R6, so output end is changed into high level again.
Resistance R5 is connected between comparator U1A in-phase input end and output end, makes comparator U1A formation one positive and negative
Road is fed back to, voltage comparison unit 12 is possessed hysteretic characteristic, the hysteretic characteristic can gradually increase in input voltage or gradually subtract
Hour, corresponding two unequal threshold values, exported according to hysteresis loop, so as to prevent comparator output terminal level state from persistently jumping
Become.
Fig. 4 shows voltage detection unit in the under-voltage protecting circuit of the onboard system that the utility model embodiment provides
Exemplary circuit structure, for convenience of description, it illustrate only the part related to the utility model.
As the embodiment of the utility model one, voltage detection unit 13 includes：
Resistance R7, resistance R8 and electric capacity C6；
Resistance R7 one end is the input of voltage detection unit 13, and the resistance R7 other end is voltage detection unit 13
Output end is connected with resistance R8 one end and electric capacity C6 one end simultaneously, and the resistance R8 other end and the electric capacity C6 other end are simultaneously
Ground connection.
In the utility model embodiment, the ground in voltage detection unit 13 is the second ground voltage, the first ground voltage and
Connected between two ground voltages by common mode inductance.
In the utility model embodiment, resistance R7, resistance R8 preferably use high-precision resistance, the result of both partial pressures
As the detection data of input voltage, while it is also the input data that processing unit 14 is AD converted, electric capacity C6 has filtering
Effect.
By selecting suitable resistance R7 and resistance R8, the threshold voltage and under-voltage protection threshold value electricity of power supply can be set
Pressure.With reference to two threshold voltages of voltage comparator, ensure that AD collections are effective, processing unit is realized collection input voltage in real time
V0 numerical value is given to the purpose that vehicle power 2 (such as full liquid crystal instrument power module) reaches voltage management.
With reference to Fig. 2, Fig. 3, Fig. 4, the operation principle of the under-voltage protecting circuit of onboard system is：
When input voltage vin rises and reaches certain numerical value U1, the voltage comparison signal of the output of voltage comparison unit 12
Vout upsets are low level, and now the reference voltage of the A/D converter of processing unit 14 is stable, are ensured by resistance R7, resistance
R8 AD collections are effective.Assuming that the voltage of AD collections is when be U2 (U2 ＞ U1), single-chip microcomputer unlatching onboard system power supply 2 certain all the way
Power supply；When input voltage vin drops to certain numerical value U3, the reference voltage of Chip Microcomputer A/D converters starts to diminish.Equally,
In order to ensure that AD collections are effective, the input voltage of the voltage detection unit collection of resistance R7, resistance R8 composition should be made on U3
To close the under-voltage protection voltage threshold of certain power supply all the way of onboard system power supply 2, U4, i.e. U4 ＞ U3 are designated as.Due to voltage ratio
Certain amount of hysteresis is provided with by resistance R5 compared with unit 12, so voltage U3 should be less than U1.That is, certain of onboard system power supply 2
Power supply all the way, open when voltage rises to U2, closed when voltage drops to U4, prevent onboard system longtime running under-voltage
State.
Illustrate technique effect below by design parameter.
Further, comparator U1A uses LM2903 type comparable chips, and processor 14 is that single-chip microcomputer uses 3.3V systems,
Set：Power supply VCC is 3.3V, R1=220k Ω, R2=100k Ω, R3=82k Ω, R4=82k Ω, R5=220k Ω, R6=
100kΩ。
Actually measured, when input voltage vin rises to 5.6V or so, comparator U1A output end Vout voltages are by 3.3V
It is changed into 0V, now the reference voltage of Chip Microcomputer A/D converters is stable in 3.3V；And when input voltage vin drops to 4.5V or so
When, comparator U1A output ends Vout voltage is changed into 3.3V from 0V, and now the reference voltage of Chip Microcomputer A/D converters is also 3.3V.
In this case, when to set Vin be about 6V using voltage detecting circuit, electric power starting all the way is chosen；When input voltage vin is small
When 5V, the road power-off is chosen, so as to realize the under-voltage protection function of the road power supply.
It is, of course, also possible to overvoltage protection and the sequential control of the full liquid crystal instrument power module are realized by voltage detection unit
System.
The another object of the utility model embodiment is, there is provided a kind of under-voltage protecting circuit for including above-mentioned onboard system
Auto meter.
The another object of the utility model embodiment is, there is provided a kind of vehicle for including above-mentioned auto meter.
The utility model embodiment has the beneficial effect that：
1st, considered by electric capacity and magnetic bead combination and remove interference signal, improve the antijamming capability and reliability of circuit, and lead to
Point ground processing of common mode inductance is crossed, the antijamming capability of circuit is further enhancing, improves the reliability of circuit；
The hysteretic characteristic having by the positive feedback loop in comparing unit, corresponding two different thresholds on hysteresis loop
Value, forms certain amount of hysteresis, ensures effective threshold range of under-voltage protection, its is defeated so as to avoid existing under-voltage protecting circuit
Enter voltage and export vibration near a under-voltage protection voltage of setting, effectively prevent comparator output terminal level state from persistently jumping
Become, improve reliability；
2nd, the size of amount of hysteresis is adjusted by comparing unit, changes this effective rotection thresholds scope, so as to improve precision,
Avoid it is existing by transistor circuit carry out under-voltage protection, when triode enters amplification region, the collector voltage of pull-up is not
Can saltus step, the unascertainable voltage regime of single-chip microcomputer be present, and circuit temperature drift is larger, cause what accuracy of detection declined to ask
Topic；In addition, voltage comparison unit can also ensure the validity of AD collections, voltage detecting precision is improved；
3rd, gather the concrete numerical value of input voltage in real time by voltage detection unit, can both be used as under-voltage protection and overvoltage
Protection, again can use AD collection voltages detection circuit realiration multi-power supply system the sequential that powers on/off, have real-time,
Accuracy, it is comprehensive the characteristics of；
4th, by resistance R1, resistance R2, resistance R3, resistance R4, resistance R7, resistance R8 resistance size, by the quiet of circuit
State electric current accomplishes very small, not only power saving but also environmentally friendly；
5th, under-voltage protection and voltage management, circuit letter only are realized with a comparator and a small amount of device inexpensively commonly used
It is single, product design and development efficiency high, make product that there is obvious cost advantage, and circuit can be wanted according to different products
Ask, select suitable component parameter, realize under-voltage protection function, using flexible.
Preferred embodiment of the present utility model is these are only, it is all in this practicality not to limit the utility model
All any modification, equivalent and improvement made within new spirit and principle etc., should be included in guarantor of the present utility model
Within the scope of shield.
Claims (9)
1. a kind of under-voltage protecting circuit of onboard system, is connected between automobile storage battery and onboard system power supply, its feature exists
In the circuit includes：
Input voltage is filtered, considers the filter unit except interference signal and high-frequency noise, the input of the filter unit
End is connected with the automobile storage battery；
By filtered input voltage compared with reference voltage, the voltage comparison unit of voltage comparison signal, the voltage are generated
Comparing unit includes a positive feedback loop, has hysteretic characteristic, the input of the voltage comparison unit and the filtering are single
The output end connection of member；
Partial pressure detection is carried out to filtered input voltage, generates the voltage detection unit of voltage detection signal, the voltage inspection
The input for surveying unit is connected with the output end of the filter unit；
Input voltage is passed to by onboard system power supply according to voltage comparison signal and voltage detection signal, and close when under-voltage
The processing unit of power supply output, the first input end of the processing unit are connected with the output end of the voltage comparison unit, institute
The second input for stating processing unit is connected with the output end of the voltage detection unit, the output end of the processing unit and institute
State the connection of onboard system power supply；
The voltage comparison unit includes：
Resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C3, electric capacity C4, electric capacity C5 and comparator；
One end of the resistance R1 is the input of the voltage comparison unit, the other end of the resistance R1 and the comparator
Inverting input connection, the inverting input of the comparator also one end with the electric capacity C3, the resistance R2 simultaneously
One end connects, and the other end of the electric capacity C3, the other end of the resistance R2 be grounded simultaneously, one end of the resistance R3 and described
Resistance R6 one end is connected with supply voltage simultaneously, and the other end of the resistance R3 connects with the in-phase input end of the comparator
Connect, the in-phase input end of the comparator is also grounded by the resistance R4, the in-phase input end of the comparator also with it is described
Resistance R5 one end connection, the output end of the comparator for the voltage comparison unit output end simultaneously with the resistance R5
The other end connected with the other end of the resistance R6, the power end of the comparator is connected with supply voltage, the comparator
Power end be also grounded by the electric capacity C4, the earth terminal of comparator ground connection, the output end of the comparator also passes through
The electric capacity C5 ground connection.
2. circuit as claimed in claim 1, it is characterised in that the filter unit includes：
Electric capacity C1, electric capacity C2 and magnetic bead；
One end of the magnetic bead is that the one end of the input of the filter unit simultaneously with the electric capacity C1, the electric capacity C2 connects
Connect, the electric capacity C1, the other end of the electric capacity C2 are grounded simultaneously, and the other end of the magnetic bead is the output of the filter unit
End.
3. circuit as claimed in claim 2, it is characterised in that the magnetic bead is ferrite bean.
4. circuit as claimed in claim 1, it is characterised in that the comparator is LM2903 type comparable chips.
5. circuit as claimed in claim 1, it is characterised in that the voltage detection unit includes：
Resistance R7, resistance R8 and electric capacity C6；
One end of the resistance R7 is the input of the voltage detection unit, and the other end of the resistance R7 is examined for the voltage
The output end for surveying unit is connected with one end of the resistance R8 and one end of the electric capacity C6 simultaneously, the other end of the resistance R8
It is grounded simultaneously with the other end of the electric capacity C6.
6. circuit as claimed in claim 1, it is characterised in that the processing unit is single-chip microcomputer.
7. circuit as claimed in claim 1, it is characterised in that the ground in the filter unit is the first ground potential, the electricity
It is the second ground potential to press the ground in comparing unit, the voltage detection unit, is passed through between the first ground voltage and the second ground voltage
Common mode inductance connects.
8. a kind of auto meter, it is characterised in that the auto meter includes vehicle-mounted as described in any one of claim 1 to 7
The under-voltage protecting circuit of system.
9. a kind of vehicle, it is characterised in that the vehicle includes auto meter as claimed in claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720214452.9U CN206922415U (en) | 2017-03-03 | 2017-03-03 | A kind of under-voltage protecting circuit of onboard system, auto meter and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720214452.9U CN206922415U (en) | 2017-03-03 | 2017-03-03 | A kind of under-voltage protecting circuit of onboard system, auto meter and vehicle |
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| CN206922415U true CN206922415U (en) | 2018-01-23 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110400981A (en) * | 2019-06-20 | 2019-11-01 | 江苏永贵新能源科技有限公司 | One kind being used for locomotive storage batteries safety protective circuit |
| CN110718897A (en) * | 2018-07-12 | 2020-01-21 | 士林电机厂股份有限公司 | Voltage control device with automatic detection function |
| CN113419619A (en) * | 2021-07-14 | 2021-09-21 | 北京同方信息安全技术股份有限公司 | Device and method for preventing host machine from being damaged |
| CN115133646A (en) * | 2022-09-01 | 2022-09-30 | 陕西中科天地航空模块有限公司 | Power supply path control circuit with priority |
-
2017
- 2017-03-03 CN CN201720214452.9U patent/CN206922415U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110718897A (en) * | 2018-07-12 | 2020-01-21 | 士林电机厂股份有限公司 | Voltage control device with automatic detection function |
| CN110400981A (en) * | 2019-06-20 | 2019-11-01 | 江苏永贵新能源科技有限公司 | One kind being used for locomotive storage batteries safety protective circuit |
| CN113419619A (en) * | 2021-07-14 | 2021-09-21 | 北京同方信息安全技术股份有限公司 | Device and method for preventing host machine from being damaged |
| CN115133646A (en) * | 2022-09-01 | 2022-09-30 | 陕西中科天地航空模块有限公司 | Power supply path control circuit with priority |
| CN115133646B (en) * | 2022-09-01 | 2022-11-22 | 陕西中科天地航空模块有限公司 | Power supply path control circuit with priority |
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