CN208156074U - A kind of voltage detection circuit and electric car - Google Patents
A kind of voltage detection circuit and electric car Download PDFInfo
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- CN208156074U CN208156074U CN201820779406.8U CN201820779406U CN208156074U CN 208156074 U CN208156074 U CN 208156074U CN 201820779406 U CN201820779406 U CN 201820779406U CN 208156074 U CN208156074 U CN 208156074U
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Abstract
The utility model provides a kind of voltage detection circuit and electric car, voltage detection circuit include：First bleeder circuit, the second bleeder circuit, voltage changer, voltage comparison module, electric signal isolation module and micro-control unit；The input terminal of first bleeder circuit and the input terminal of voltage changer are connect with the output end of power supply respectively；The output end of voltage changer is connect with the input terminal of the second bleeder circuit；The feeder ear of voltage comparison module and the output end of voltage changer connect, the positive input of voltage comparison module is connect with the output end of the first bleeder circuit, the negative input of voltage comparison module is connect with the output end of the second bleeder circuit, and the output end of voltage comparison module is connect with the input terminal of electric signal isolation module；The output end of electric signal isolation module is connect with micro-control unit.The utility model is compared by voltage, is detected fluctuation situation of the supply voltage in a smaller range, is determined whether that there are supply voltage failures.
Description
Technical field
The utility model relates to voltage detecting field, in particular to a kind of voltage detection circuit and electric car.
Background technique
As electric car is using more and more extensive, the safety of electric car is also increasingly valued by people.
Air-conditioning system in usual electric car is heated when being heated using thermistor, and is the heat by power battery
Quick resistance is powered.In order to guarantee the safety in heating operations, whether need to detect the output voltage of power battery just
In normal range, when power battery output voltage not in the normal range, need to stop to heat.
However in existing power battery output voltage detecting circuit, power battery output voltage well below normal model
When enclosing minimum value, the voltage failure of power battery can be just generated, there are problems to learn the output voltage of power battery, cause
The safety of vehicle is very poor.
Utility model content
The utility model provides a kind of voltage detection circuit and electric car, to solve power in the prior art
The problem of the output voltage detecting circuit safety difference of battery.
In order to solve the above-mentioned technical problem, the utility model adopts the following technical solution：
According to the one aspect of the utility model, a kind of voltage detection circuit is provided, including：First partial pressure electricity
Road, the second bleeder circuit, voltage changer, voltage comparison module, electric signal isolation module and micro-control unit；
Wherein the input terminal of the input terminal of first bleeder circuit and the voltage changer respectively with the output of power supply
End connection；The output end of the voltage changer is connect with the input terminal of second bleeder circuit；
The feeder ear of the voltage comparison module is connect with the output end of the voltage changer, the voltage comparison module
Positive input connect with the output end of first bleeder circuit, the negative input of the voltage comparison module with it is described
The output end of second bleeder circuit connects, the input terminal of the output end of the voltage comparison module and the electric signal isolation module
Connection；The output end of the electric signal isolation module is connect with the micro-control unit.
Further, first bleeder circuit includes：First resistor and second resistance, the first end of the first resistor
It is connect with the anode of the power supply, the first end and voltage ratio of the second end of the first resistor and the second resistance
Positive input compared with module connects, the second end ground connection of the second resistance, and connect with the cathode of the power supply.
Further, second bleeder circuit includes：3rd resistor and the 4th resistance, the first end of the 3rd resistor
It is connect with the output end of the voltage changer, the first end and institute of the second end of the 3rd resistor and the 4th resistance
State the negative input connection of voltage comparison module, the second end ground connection of the 4th resistance.
Further, the electric signal isolation module includes photo-coupler, the 5th resistance and accessory power supply, the optical coupling
The input terminal of device is connect with the output end of the voltage comparison module, and the output end of the photo-coupler passes through the 5th electricity
Resistance is connect with the accessory power supply, and the output end of the photo-coupler is also connect with the micro-control unit.
Further, the output end of the voltage changer passes through the input of first diode and second bleeder circuit
The feeder ear of end and the voltage comparison module is separately connected, wherein anode and the voltage transformation of the first diode
The output end of device connects, the cathode of first diode mould compared with the input terminal of second bleeder circuit and the voltage
The feeder ear of block is separately connected.
Further, the voltage detection circuit further includes：The anode of second diode, second diode connects
The cathode on ground, second diode is connect with the positive input of the voltage comparison module.
Further, second diode is zener diode.
Further, the power supply is power battery.
Further, the output end of first bleeder circuit passes through the forward direction of the 6th resistance and the voltage comparison module
Input terminal connection.
Further, the output end of the voltage comparison module passes through the defeated of the 7th resistance and the electric signal isolation module
Enter end connection.
Further, the voltage comparison module is voltage comparator or power amplifier.
According to the another aspect of the utility model, a kind of electric car is provided, including：Supply voltage as described above
Detection circuit.
The utility model has the beneficial effects that：
Above-mentioned technical proposal divides supply voltage by the first bleeder circuit, and passes through the second bleeder circuit pair
The voltage of voltage changer output is divided, and by voltage comparison module, judges the size of voltage after two punishment pressures, and
Electric signal is output to micro-control unit by electric signal isolation module, voltage is big after micro-control unit is pressed according to two punishment
It is small, so that it is determined that whether the fluctuation of supply voltage exceeds safe range, and then determine that power supply whether there is voltage failure.
Detailed description of the invention
Fig. 1 shows a kind of one of voltage detection circuit schematic diagrames provided by the embodiment of the utility model；
Fig. 2 indicates the two of a kind of voltage detection circuit schematic diagram provided by the embodiment of the utility model；
Fig. 3 indicates the three of a kind of voltage detection circuit schematic diagram provided by the embodiment of the utility model.
Description of symbols：
11, the first bleeder circuit；12, the second bleeder circuit；13, voltage changer；14, voltage comparison module；15, telecommunications
Number isolation module；16, micro-control unit；17, power supply；R1, first resistor；R2, second resistance；R3,3rd resistor；R4, the 4th
Resistance；R5, the 5th resistance；R6, the 6th resistance；R7, the 7th resistance；U1, photo-coupler.
Specific embodiment
The exemplary embodiment of the utility model is more fully described below with reference to accompanying drawings.Although showing this in attached drawing
The exemplary embodiment of utility model, it being understood, however, that may be realized in various forms the utility model without should be by here
The embodiment of elaboration is limited.It is to be able to thoroughly understand the utility model, and energy on the contrary, providing these embodiments
It is enough to be fully disclosed to those skilled in the art the scope of the utility model.
As shown in Figure 1-3, the utility model embodiment provides a kind of voltage detection circuit, supply voltage detection
Circuit includes：
First bleeder circuit 11, the second bleeder circuit 12, voltage changer 13, voltage comparison module 14, electric signal isolation
Module 15 and micro-control unit 16；
The wherein input terminal of the input terminal of the first bleeder circuit 11 and voltage changer 13 output end with power supply 17 respectively
Connection；The output end of voltage changer 13 is connect with the input terminal of the second bleeder circuit 12；
The feeder ear of voltage comparison module 14 is connect with the output end of voltage changer 13, the forward direction of voltage comparison module 14
Input terminal is connect with the output end of the first bleeder circuit 11, the negative input of voltage comparison module 14 and the second bleeder circuit 12
Output end connection, the output end of voltage comparison module 14 connect with the input terminal of electric signal isolation module 15；Electric signal isolation
The output end of module 15 is connect with micro-control unit 16.
It should be noted that can detecte power battery when the voltage detection circuit is applied to electric car
Output voltage, preferably, power supply 17 is power battery.In order to protect voltage comparison module 14, voltage ratio can also be connected to
Compared with series limiting resistor in the circuit of module 14, the output end of specific first bleeder circuit 11 passes through the 6th resistance R6 and voltage
The positive input of comparison module 14 connects.Similarly in order to protect electric signal isolation module 15, voltage comparison module 14 it is defeated
Outlet is connect by the 7th resistance R7 with the input terminal of electric signal isolation module 15.For save the cost, voltage comparison module 14
Using existing functional module, such as voltage comparison module 14 is voltage comparator or power amplifier.
If the voltage that the positive input of voltage comparison module 14 inputs is greater than the voltage of negative input input, export
High level signal；If the voltage that the positive input of voltage comparison module 14 inputs is less than the voltage of negative input input,
Export low level signal, level signal is that can determine that voltage comparison module 14 exports is high to micro-control unit 16 based on the received
Level signal or low level signal.Preferably, when power supply 17 exports normal voltage, the voltage of the first bleeder circuit 11 output
It is greater than greater than the voltage that the positive input of the voltage of the second bleeder circuit 12 output, that is, voltage comparison module 14 inputs negative
The voltage inputted to input terminal, then voltage comparison module 14 exports high level signal；In the voltage that power supply 17 exports lower than normal
When minimum value in voltage range, the voltage of the first bleeder circuit 11 output less than the voltage that the second bleeder circuit 12 exports,
It is exactly that the voltage of the positive input input of voltage comparison module 14 is less than the voltage of negative input input, then voltage compares mould
Block 14 exports low level signal.
In the utility model embodiment, supply voltage is divided by the first bleeder circuit 11, and passes through second point
The voltage that volt circuit 12 exports voltage changer 13 divides, and by voltage comparison module 14, judges that two punishment press it
The size of voltage afterwards, and electric signal is output to by micro-control unit 16 by electric signal isolation module 15, micro-control unit 16
According to the size of voltage after two punishment pressures, so that it is determined that whether the fluctuation of supply voltage exceeds safe range, and then power supply is determined
17 whether there is voltage failure.
As shown in Fig. 2, on the basis of above-mentioned utility model embodiment, in the utility model embodiment, the first partial pressure electricity
Road 11 includes：The first end of first resistor R1 and second resistance R2, first resistor R1 are connect with the anode of power supply 17, first resistor
The second end of R1 is connect with the positive input of the first end of second resistance R2 and voltage comparison module 14, second resistance R2's
Second end ground connection, and connect with the cathode of power supply 17.
It should be noted that the resistance value of first resistor R1 and second resistance R2 can be according to the normal of the output of power supply 17
Voltage range determines.
With continued reference to Fig. 2, on the basis of above-mentioned utility model embodiment, in the utility model embodiment, the second partial pressure
Circuit 12 includes：The first end of 3rd resistor R3 and the 4th resistance R4,3rd resistor R3 and the output end of voltage changer 13 connect
It connecing, the second end of 3rd resistor R3 is connect with the negative input of the first end of the 4th resistance R4 and voltage comparison module 14,
The second end of 4th resistance R4 is grounded.
It should be noted that 3rd resistor R3 and the 4th resistance R4 can be according to the normal voltage range of the output of power supply 17
It determines.
With continued reference to Fig. 2, on the basis of above-mentioned utility model embodiment, in the utility model embodiment, electric signal every
From module 15 include photo-coupler U1, the 5th resistance R5 and accessory power supply, the input terminal of photo-coupler U1 with voltage compared with mould
The output end of block 14 connects, and the output end of photo-coupler U1 is connect by the 5th resistance R5 with accessory power supply, photo-coupler U1's
Output end is also connect with micro-control unit 16.
It should be noted that accessory power supply is determined according to photo-coupler U1, for example, accessory power supply is that output voltage is
5 volts of power supply.
As shown in figure 3, voltage converter output generation high pressure damages in order to prevent, implement in above-mentioned utility model
On the basis of example, in the utility model embodiment, the output end of voltage changer 13 passes through the partial pressure of first diode D1 and second
The input terminal of circuit 12 and the feeder ear of voltage comparison module 14 are separately connected, wherein the anode and voltage of first diode D1
The output end of converter 13 connects, the input terminal and voltage comparison module of the cathode of first diode D1 and the second bleeder circuit 12
14 feeder ear is separately connected.
With continued reference to Fig. 3, in order to carry out overvoltage protection to voltage comparison module, on the basis of above-mentioned utility model embodiment
On, in the utility model embodiment, voltage detection circuit further includes：Second diode D2, the anode of the second diode D2
Ground connection, the cathode of the second diode D2 are connect with the positive input of voltage comparison module 14.
It should be noted that the second diode D2 is zener diode.
According to the another aspect of the utility model, a kind of electric car is provided, including above-mentioned each utility model is implemented
The voltage detection circuit that example provides.
In the utility model embodiment, supply voltage is divided by the first bleeder circuit, and passes through the second partial pressure
The voltage that circuit exports voltage changer divides, and by voltage comparison module, judges voltage after two punishment pressures
Size, and electric signal is output to by micro-control unit by electric signal isolation module, after micro-control unit is according to two punishment pressures
The size of voltage so that it is determined that whether the fluctuation of supply voltage exceeds safe range, and then determines power supply with the presence or absence of voltage event
Barrier.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be
Mechanical connection is also possible to be electrically connected or can communicate with each other；It can be directly connected, the indirect phase of intermediary can also be passed through
Even, the connection inside two elements or the interaction relationship of two elements be can be.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
Although the preferred embodiment of the utility model embodiment has been described, those skilled in the art are once learnt
Basic creative concept, then additional changes and modifications can be made to these embodiments.So appended claims are intended to solve
It is interpreted as including preferred embodiment and all change and modification for falling into the utility model embodiment range.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or terminal device including a series of elements not only wrap
Those elements are included, but also including other elements that are not explicitly listed, or further includes for this process, method, article
Or the element that terminal device is intrinsic.In the absence of more restrictions, being wanted by what sentence "including a ..." limited
Element, it is not excluded that there is also other identical elements in process, method, article or the terminal device for including the element.
Claims (12)
1. a kind of voltage detection circuit, which is characterized in that including：First bleeder circuit, the second bleeder circuit, voltage transformation
Device, voltage comparison module, electric signal isolation module and micro-control unit；
Wherein the input terminal of the input terminal of first bleeder circuit and the voltage changer connects with the output end of power supply respectively
It connects；The output end of the voltage changer is connect with the input terminal of second bleeder circuit；
The feeder ear of the voltage comparison module is connect with the output end of the voltage changer, and the voltage comparison module is just
It is connect to input terminal with the output end of first bleeder circuit, the negative input of the voltage comparison module and described second
The output end of bleeder circuit connects, and the input terminal of the output end of the voltage comparison module and the electric signal isolation module connects
It connects；The output end of the electric signal isolation module is connect with the micro-control unit.
2. voltage detection circuit according to claim 1, which is characterized in that first bleeder circuit includes：The
One resistance and second resistance, the first end of the first resistor are connect with the anode of the power supply, and the second of the first resistor
End is connect with the positive input of the first end of the second resistance and the voltage comparison module, and the of the second resistance
Two ends ground connection, and connect with the cathode of the power supply.
3. voltage detection circuit according to claim 1, which is characterized in that second bleeder circuit includes：The
Three resistance and the 4th resistance, the first end of the 3rd resistor are connect with the output end of the voltage changer, the third electricity
The second end of resistance is connect with the negative input of the first end of the 4th resistance and the voltage comparison module, and the described 4th
The second end of resistance is grounded.
4. voltage detection circuit according to claim 1, which is characterized in that the electric signal isolation module includes light
The output end of coupler, the 5th resistance and accessory power supply, the input terminal of the photo-coupler and the voltage comparison module connects
It connects, the output end of the photo-coupler is connect by the 5th resistance with the accessory power supply, the output of the photo-coupler
End is also connect with the micro-control unit.
5. voltage detection circuit according to claim 1, which is characterized in that the output end of the voltage changer is logical
The feeder ear of the input terminal and the voltage comparison module of crossing first diode and second bleeder circuit is separately connected,
In, the anode of the first diode is connect with the output end of the voltage changer, the cathode of the first diode and institute
The feeder ear of the input terminal and the voltage comparison module of stating the second bleeder circuit is separately connected.
6. voltage detection circuit according to claim 1, which is characterized in that the voltage detection circuit also wraps
It includes：Second diode, the plus earth of second diode, the cathode of second diode and the voltage comparison module
Positive input connection.
7. voltage detection circuit according to claim 6, which is characterized in that second diode is two pole of pressure stabilizing
Pipe.
8. voltage detection circuit according to claim 1, which is characterized in that the power supply is power battery.
9. voltage detection circuit according to claim 1, which is characterized in that the output end of first bleeder circuit
It is connect by the 6th resistance with the positive input of the voltage comparison module.
10. voltage detection circuit according to claim 1, which is characterized in that the output of the voltage comparison module
End is connect by the 7th resistance with the input terminal of the electric signal isolation module.
11. voltage detection circuit according to claim 1, which is characterized in that the voltage comparison module is voltage
Comparator or power amplifier.
12. a kind of electric car, which is characterized in that including：Supply voltage detection electricity as described in any one of claim 1 to 11
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820779406.8U CN208156074U (en) | 2018-05-23 | 2018-05-23 | A kind of voltage detection circuit and electric car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820779406.8U CN208156074U (en) | 2018-05-23 | 2018-05-23 | A kind of voltage detection circuit and electric car |
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| Publication Number | Publication Date |
|---|---|
| CN208156074U true CN208156074U (en) | 2018-11-27 |
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| CN201820779406.8U Active CN208156074U (en) | 2018-05-23 | 2018-05-23 | A kind of voltage detection circuit and electric car |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111722061A (en) * | 2020-07-01 | 2020-09-29 | 上海恒敬电力科技有限公司 | But early warning device of remote monitoring power distribution station overvoltage operation |
| CN112068034A (en) * | 2020-09-29 | 2020-12-11 | 深圳市嘉昱机电有限公司 | Circuit and equipment for detecting power failure of direct-current power supply |
| CN113866667A (en) * | 2020-06-12 | 2021-12-31 | 宁德时代新能源科技股份有限公司 | High-voltage interlocking circuit and detection method thereof |
-
2018
- 2018-05-23 CN CN201820779406.8U patent/CN208156074U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866667A (en) * | 2020-06-12 | 2021-12-31 | 宁德时代新能源科技股份有限公司 | High-voltage interlocking circuit and detection method thereof |
| US11549999B2 (en) | 2020-06-12 | 2023-01-10 | Contemporary Amperex Technology Co., Limited | High voltage interlock device and detection method thereof |
| CN111722061A (en) * | 2020-07-01 | 2020-09-29 | 上海恒敬电力科技有限公司 | But early warning device of remote monitoring power distribution station overvoltage operation |
| CN112068034A (en) * | 2020-09-29 | 2020-12-11 | 深圳市嘉昱机电有限公司 | Circuit and equipment for detecting power failure of direct-current power supply |
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