CN110347067A - Battery management system total voltage monitors circuit - Google Patents
Battery management system total voltage monitors circuit Download PDFInfo
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- CN110347067A CN110347067A CN201810307778.5A CN201810307778A CN110347067A CN 110347067 A CN110347067 A CN 110347067A CN 201810307778 A CN201810307778 A CN 201810307778A CN 110347067 A CN110347067 A CN 110347067A
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21119—Circuit for signal adaption, voltage level shift, filter noise
Abstract
The present invention relates to a kind of battery management system total voltages to monitor circuit, including control circuit, stagnation pressure Acquisition Circuit, stagnation pressure charge-discharge circuit and stagnation pressure counting circuit, control circuit connects stagnation pressure Acquisition Circuit, stagnation pressure charge-discharge circuit and stagnation pressure counting circuit, stagnation pressure Acquisition Circuit connects stagnation pressure charge-discharge circuit, stagnation pressure charge-discharge circuit connects stagnation pressure counting circuit, control circuit sends any road total voltage in first control signal control stagnation pressure Acquisition Circuit access battery management system and is sent to stagnation pressure charge-discharge circuit and charges, when detecting that the voltage of stagnation pressure charge-discharge circuit reaches predeterminated voltage, the voltage for sending second control signal control stagnation pressure calculating circuit sampling stagnation pressure charge-discharge circuit obtains feedback voltage and is sent to control circuit, control circuit receives feedback voltage, monitored results are obtained according to feedback voltage and are exported, it sends Third controls signal control stagnation pressure charge-discharge circuit electric discharge, greatly reduces the quantity using component, PCB space and cost greatly reduce.
Description
Technical field
The present invention relates to the fields of the battery management system BMS of batteries of electric automobile packet, more particularly to a kind of cell tube
Reason system total voltage monitors circuit.
Background technique
Cell management system of electric automobile BMS is mainly used for monitoring the power battery parameter of battery pack in real time, this
It is the basis that battery management system operates normally.It just include the concatenated total voltage of all batteries in the battery parameter of real time monitoring
Acquire data.
Traditional BMS stagnation pressure monitors circuit, and amplifier calculates stagnation pressure all the way all the way, and 4 road stagnation pressures have been used 4 road transports and put, and its
Relevant circuit, therefore the component used is relatively more, the space put in PCB circuit board is big, and cost is also high, therefore, passes
The BMS stagnation pressure monitoring circuit space of system is big and at high cost.
Summary of the invention
Based on this, it is necessary in view of the above-mentioned problems, providing a kind of space small and at low cost battery management system total voltage
Monitor circuit.
A kind of battery management system total voltage monitoring circuit, including control circuit, stagnation pressure Acquisition Circuit, stagnation pressure charge and discharge electricity
Road and stagnation pressure counting circuit, the control circuit connect the stagnation pressure Acquisition Circuit, the stagnation pressure charge-discharge circuit and described total
Press counting circuit, the stagnation pressure Acquisition Circuit connects the stagnation pressure charge-discharge circuit, described in the stagnation pressure charge-discharge circuit connection
Stagnation pressure counting circuit,
The control circuit is for sending first control signal to the stagnation pressure Acquisition Circuit；Detecting stagnation pressure charge and discharge
When the voltage of circuit reaches predeterminated voltage, second control signal is sent to the stagnation pressure counting circuit；The stagnation pressure is received to calculate
The feedback voltage that circuit is sent, obtains monitored results according to the feedback voltage and exports；And send third control signal extremely
The stagnation pressure charge-discharge circuit；
The stagnation pressure Acquisition Circuit is for appointing in the first control signal access battery management system based on the received
Total voltage and it is sent to the stagnation pressure charge-discharge circuit all the way；
The stagnation pressure charge-discharge circuit charges for total voltage based on the received；And the third based on the received
Control signal discharges；
The stagnation pressure counting circuit fills the stagnation pressure charge-discharge circuit for the second control signal based on the received
Voltage after electricity is sampled, and is obtained feedback voltage and is sent to the control circuit.
Above-mentioned battery management system total voltage monitors circuit, and control circuit is acquired for sending first control signal to stagnation pressure
Circuit, stagnation pressure Acquisition Circuit access any road total voltage in battery management system simultaneously for first control signal based on the received
It is sent to stagnation pressure charge-discharge circuit, stagnation pressure charge-discharge circuit charges for total voltage based on the received, and control circuit is being examined
When measuring the voltage of stagnation pressure charge-discharge circuit and reaching predeterminated voltage, second control signal is sent to stagnation pressure counting circuit；Master gauge
It calculates circuit and the voltage after the charging of voltage charge-discharge circuit is sampled for second control signal based on the received, fed back
Voltage is simultaneously sent to control circuit, receives the feedback voltage that stagnation pressure counting circuit is sent, obtains monitored results according to feedback voltage
And export, control circuit sends third and controls signal to stagnation pressure charge-discharge circuit, stagnation pressure charge-discharge circuit third based on the received
Control signal discharges.There are multichannel total voltage, any road in control circuit controllable multi-route voltage in battery management system
Total voltage access charges to stagnation pressure charge-discharge circuit, reaches predeterminated voltage in the voltage for detecting stagnation pressure charge-discharge circuit
Afterwards, control stagnation pressure counting circuit samples the voltage after the charging of stagnation pressure charge-discharge circuit, obtains feedback voltage, and stagnation pressure calculates
Circuit can obtain corresponding feedback voltage with any road voltage in sampling multiple stagnation pressure, not need the increase with stagnation pressure all the way
And the quantity for increasing component is corresponded to, therefore, entire battery management system total voltage monitoring circuit is greatly reduced using first device
The placing space of the quantity of part, PCB circuit board decreases, and cost greatly reduces.
Detailed description of the invention
Fig. 1 is battery management system total voltage monitor circuit structure block diagram in an embodiment；
Fig. 2 is the basic framework block diagram in an embodiment inside battery pack；
Fig. 3 is battery management system total voltage monitor circuit structure block diagram in another embodiment；
Fig. 4 is battery management system total voltage monitor circuit structure block diagram in another embodiment；
Fig. 5 is the circuit diagram of decoder selection circuit in an embodiment；
Fig. 6 is battery management system total voltage monitor circuit structure block diagram in another embodiment；
Fig. 7 is stagnation pressure Acquisition Circuit and stagnation pressure charge-discharge circuit schematic diagram in an embodiment；
Fig. 8 is that stagnation pressure calculates circuit diagram in an embodiment.
Specific embodiment
In one embodiment, as shown in Figure 1, a kind of battery management system total voltage monitors circuit, including control circuit
110, stagnation pressure Acquisition Circuit 120, stagnation pressure charge-discharge circuit 130 and stagnation pressure counting circuit 140, control circuit 110 connect stagnation pressure and adopt
Collector 120, stagnation pressure charge-discharge circuit 130 and stagnation pressure counting circuit 140, stagnation pressure Acquisition Circuit 120 connect stagnation pressure charge and discharge electricity
Road 130, stagnation pressure charge-discharge circuit 130 connect stagnation pressure counting circuit 140, and control circuit 110 is for sending first control signal extremely
Stagnation pressure Acquisition Circuit 120；When detecting that the voltage of stagnation pressure charge-discharge circuit 130 reaches predeterminated voltage, the second control letter is sent
Number to stagnation pressure counting circuit 140；The feedback voltage that stagnation pressure counting circuit 140 is sent is received, monitoring knot is obtained according to feedback voltage
Fruit simultaneously exports；And it sends third and controls signal to stagnation pressure charge-discharge circuit 130；Stagnation pressure Acquisition Circuit 120 is used for according to reception
First control signal access battery management system in any road total voltage and be sent to stagnation pressure charge-discharge circuit 130；Stagnation pressure
Charge-discharge circuit 130 charges for total voltage based on the received；And third control signal discharges based on the received；
Voltage after stagnation pressure counting circuit 140 charges to stagnation pressure charge-discharge circuit 130 for second control signal based on the received carries out
Sampling, obtains feedback voltage and is sent to control circuit 110.
Specifically, as shown in Fig. 2, VBAT-H is the anode voltage of battery, VBAT-L is the negative terminal voltage of battery, while
It is the negative terminal voltage of the first heating relay and the second heating relay, VBUS-H is the anode voltage of total positive relay, VBUS-
L is the negative terminal voltage of total negative relay, and VBUS-P-H is the anode voltage of the first heating relay, VBUS-P-H1 be second plus
The anode voltage (not shown) of electrothermal relay.The anode voltage of acquisition can choose VBAT-H, VBUS-H, VBUS-P-H, VBUS-
P-H1 this one of 4, the negative terminal voltage of detection can choose VBAT-L, VBUS-L this one of 2, it is possible to examine
Survey 8 road stagnation pressures.
Control circuit 110 sends first control signal to stagnation pressure Acquisition Circuit 120, and control circuit 110 is for sending first
Signal is controlled to stagnation pressure Acquisition Circuit 120, stagnation pressure Acquisition Circuit 120 accesses cell tube for first control signal based on the received
Any road total voltage in reason system is simultaneously sent to stagnation pressure charge-discharge circuit 130, and stagnation pressure charge-discharge circuit 130 is used for according to reception
Total voltage charge, control circuit 110 when the voltage for detecting stagnation pressure charge-discharge circuit 130 reaches predeterminated voltage, hair
Send second control signal to stagnation pressure counting circuit 140；Stagnation pressure counting circuit 140 is for second control signal based on the received to electricity
Voltage after pressure charge-discharge circuit charging is sampled, and is obtained feedback voltage and is sent to control circuit 110, is received stagnation pressure and is calculated
The feedback voltage that circuit 140 is sent, obtains monitored results according to feedback voltage and exports, and control circuit 110 sends third control
Signal is to stagnation pressure charge-discharge circuit 130, and third control signal discharges stagnation pressure charge-discharge circuit 130 based on the received.
Above-mentioned battery management system total voltage monitors circuit, has multichannel total voltage, control circuit 110 in battery management system
Any road total voltage access in controllable multi-route voltage charges to stagnation pressure charge-discharge circuit 130, is detecting that stagnation pressure fills
After the voltage of discharge circuit 130 reaches predeterminated voltage, after control stagnation pressure counting circuit 140 charges to stagnation pressure charge-discharge circuit 130
Voltage sampled, obtain feedback voltage.For example, total just total negative voltage when collected battery strings is normal, i.e. VBAT-H,
Voltage between VBAT-L is normally, if the stagnation pressure of collected total positive relay anode voltage and battery strings negative terminal voltage
Extremely, i.e. voltage between VBUS-H, VBAT-L is abnormal, then may determine that total positive relay is abnormal, pass through this side
Method can acquire a few road stagnation pressures more, be compared by feedback voltage and default normal voltage, and whether each relay of cross validation
It is abnormal.Stagnation pressure counting circuit 140 can obtain corresponding feedback voltage with any road voltage in sampling multiple stagnation pressure, do not need with
All the way the increase of stagnation pressure and correspond to the quantity for increasing component, therefore, entire battery management system total voltage monitoring circuit is big
Reduce the quantity using component greatly, the placing space of PCB circuit board decreases, and cost greatly reduces.
In one embodiment, as shown in figure 3, control circuit 110 includes single-chip microcontroller 112 and decoder selection circuit 114,
Single-chip microcontroller 112 connects stagnation pressure Acquisition Circuit 120, stagnation pressure charge-discharge circuit 130 and stagnation pressure by decoder selection circuit 114 and calculates
Circuit 140, single-chip microcontroller 112 connect stagnation pressure counting circuit 140, and single-chip microcontroller 112 is for sending the first decoder address signal
To decoder selection circuit 114；When detecting that the voltage of stagnation pressure charge-discharge circuit 130 reaches predeterminated voltage, sends second and translate
Code device address signal is to decoder selection circuit 114；The feedback voltage that stagnation pressure counting circuit 140 is sent is received, according to anti-
Feedthrough voltage obtains monitored results and exports；And third decoder address signal is sent to decoder selection circuit 114；It translates
Code device selection circuit 114 sends first control signal to stagnation pressure for the first decoder address signal based on the received and acquires
Circuit 120；The second decoder address signal sends second control signal to stagnation pressure counting circuit 140 based on the received；With
And third decoder address signal sends third control signal to stagnation pressure charge-discharge circuit 130 based on the received.
Specifically, single-chip microcontroller 112 controls the transmission pair of decoder selection circuit 114 by sending decoder address signal
The control signal answered carries out pair to control stagnation pressure Acquisition Circuit 120, stagnation pressure charge-discharge circuit 130 and stagnation pressure counting circuit 140
It should operate.
In one embodiment, as shown in figure 4, decoder selection circuit 114 includes the first 3-8 decoder 1142 and second
3-8 decoder 1144, the first 3-8 decoder 1142 connect stagnation pressure Acquisition Circuit 120, stagnation pressure charge-discharge circuit 130 and master gauge
Circuit 140 is calculated, the 2nd 3-8 decoder 1144 connects stagnation pressure Acquisition Circuit 120.
Specifically, the input of 3-8 decoder is 3 feet, and output is 8 feet, is indicated to output and input with low and high level.
Input is binary system, i.e., input is 3 bits, and 3 binary system maximums are 111 namely 8.Output is 8 feet, indicates 10
System is to be exported according to the binary number of input, if it is so exactly the 5th foot high level that input, which is 101, indicates binary system
Number is 5, i.e. the function of 3-8 decoder is exactly that 32 system numbers of input are translated into the output of 10 systems, to control decoding
Device selection circuit 114 sends corresponding control signal.
Further, as shown in figure 5, VOLT1~VOLT8 has 8 output signals altogether, using 2 3-8 decoders, VOLT7
The control signal calculated with the electric discharge of the two stagnation pressures of VOLT8 and stagnation pressure is the defeated of the first 3-8 decoder 1142 (U1 in corresponding diagram)
The control signal of the two negative terminal voltages of signal Y1 and Y2 out, VOLT5 and VOLT6 is the 2nd 3-8 decoder 1144 (in corresponding diagram
U2 output signal Y0 and Y1), configured in this way effect are, only when VOLT-CON_3 is low level, VOLT7 and VOLT8
It is likely to output signal, the 2nd 3-8 decoder 1144 does not just enable at this time, and VOLT5 and VOLT6 are just certain without output letter
Number；When VOLT-CON_3 is high level, the 2nd 3-8 decoder 1144 is enabled at this time, and VOLT5 and VOLT6 may have output to believe
Number, however be not no output signal under VOLT7 and VOLT8 this state, such VOLT5/VOLT6 and VOLT7/VOLT8 are not
There can be signal output simultaneously, as long as so the calculating of progress stagnation pressure and stagnation pressure discharge when link, any Acquisition Circuit of stagnation pressure all the way 120
It will not all open, can effectively carry out the isolation between high-low pressure.Decoder selection circuit 114 uses two 3-8 decoders
The technical advantage of itself is can to utilize hardware circuit, prevents software faults, i.e. the control signal of the output of single-chip microcontroller 112 is wrong
When, high-tension circuit will not influence low-voltage circuit, and high-low pressure can effectively be isolated, and will not influence the stability of BMS.
In one embodiment, as shown in fig. 6, stagnation pressure Acquisition Circuit 120 includes anode voltage collection circuit 122 and negative terminal
Voltage collection circuit 124, anode voltage collection circuit 122 and negative terminal voltage Acquisition Circuit 124 connect stagnation pressure charge-discharge circuit 130
With control circuit 110.
It specifically, in the present embodiment, include 4 plus ends, 2 negative terminals, it will be understood that battery pack inside battery pack
The quantity of internal plus end and negative terminal can be adaptively adjusted according to the actual situation, anode voltage collection circuit 122
For any road anode voltage in control 4 tunnel of signal conduction according to control circuit 110, negative terminal voltage Acquisition Circuit 124 is used
Any road negative terminal voltage in control 2 tunnel of signal conduction according to control circuit 110, stagnation pressure Acquisition Circuit 120 is according to control
Any road voltage in control 8 tunnel of signal conduction of circuit 110 charges to stagnation pressure charge-discharge circuit 130.
In one embodiment, as shown in fig. 7, anode voltage collection circuit 122 includes the first current-limiting resistance R1, the second limit
Leakage resistance R2, third current-limiting resistance R7, the 4th current-limiting resistance R3, the 5th current-limiting resistance R4, the 6th current-limiting resistance R8, the first high pressure
The anode voltage of the first end of optocoupler Q1 and the second high pressure optocoupler Q2, the first current-limiting resistance R1 connection the first heating relay, the
The second end of one current-limiting resistance R1 connects 8 feet of the first high pressure optocoupler Q1, and the first end connection second of the second current-limiting resistance R2 adds
The anode voltage of electrothermal relay, the second end of the second current-limiting resistance R2 connect 6 feet of the first high pressure optocoupler Q1, third current-limiting resistance
The first end of R7 connects 1 foot and 3 feet of the first high pressure optocoupler Q1, the second end connection positive digital power supply electricity of third current-limiting resistance R7
DVCC is pressed, 7 feet of the first high pressure optocoupler Q1 and 5 feet connect stagnation pressure charge-discharge circuit 130, the 2 feet connection of the first high pressure optocoupler Q1
4 feet of control circuit 110, the first high pressure optocoupler Q1 connect control circuit 110；The first end of 4th current-limiting resistance R3 connects battery
Anode voltage, the second end of the 4th current-limiting resistance R3 connects 8 feet of the second high pressure optocoupler Q2, the first of the 5th current-limiting resistance R4
The anode voltage of the total positive relay of end connection, 6 feet of the second high pressure optocoupler Q2 of second end connection of the 5th current-limiting resistance R4, the 6th
The first end of current-limiting resistance R8 connects 1 foot and 3 feet of the second high pressure optocoupler Q2, and the second end of the 6th current-limiting resistance R8 connects positive number
Word supply voltage DVCC, 7 feet of the second high pressure optocoupler Q2 and 5 feet connect stagnation pressure charge-discharge circuit 130, the second high pressure optocoupler Q2's
2 feet connect control circuit 110, and 4 feet of the second high pressure optocoupler Q2 connect control circuit 110.
Specifically, the first control terminal VOLT1 of the 2 feet connection control circuit 110 of the first high pressure optocoupler Q1, the first high press polish
2 feet of second control terminal VOLT2, the second high pressure optocoupler Q2 of the 4 feet connection control circuit 110 of coupling Q1 connect control circuit 110
Third control terminal VOLT3, the second high pressure optocoupler Q2 4 feet connection control circuit 110 the 4th control terminal VOLT4, anode electricity
The first high pressure optocoupler Q1 and the second high pressure optocoupler Q2 in Acquisition Circuit 122 is pressed to control according to first to the 4th control terminal VOLT4
Low and high level control conducting, for example, when third control terminal VOLT3 control signal be low level, i.e. the second high pressure optocoupler Q2
Top half optocoupler it is open-minded, the collection voltages corresponded to be battery anode voltage.
In one embodiment, negative terminal voltage Acquisition Circuit 124 include the 7th current-limiting resistance R5, the 8th current-limiting resistance R6,
The first end of 9th current-limiting resistance R9 and low pressure optocoupler Q3, the 7th current-limiting resistance R5 connect the negative terminal voltage of battery, the 7th current limliting
8 feet of the second end connection low pressure optocoupler Q3 of resistance R5, the negative terminal of the total positive relay of the first end connection of the 8th current-limiting resistance R6
Voltage, 6 feet of the second end connection low pressure optocoupler Q3 of the 8th current-limiting resistance R6, the first end of the 9th current-limiting resistance R9 connect low pressure
The second end of 1 foot and 3 feet of optocoupler Q3, the 9th current-limiting resistance R9 connects positive digital supply voltage DVCC, 7 feet of low pressure optocoupler Q3
Stagnation pressure charge-discharge circuit 130 is connected with 5 feet, 2 feet of high pressure optocoupler connect control circuit 110, and 4 feet of low pressure optocoupler Q3 connect control
Circuit 110 processed.
Specifically, the 5th control terminal VOLT5 of the 2 feet connection control circuit 110 of high pressure optocoupler, 4 feet of low pressure optocoupler Q3
The 6th control terminal VOLT6 of control circuit 110 is connected, the low pressure optocoupler Q3 in negative terminal voltage Acquisition Circuit 124 is according to the 5th control
The low and high level of end VOLT5 and the 6th control terminal VOLT6 processed control conducting, for example, when the control signal of the 5th control terminal VOLT5
For low level, i.e. the top half optocoupler of low pressure optocoupler Q3 is open-minded, and the collection voltages corresponded to are the negative terminal voltage of battery, simultaneously
Namely first heating relay and second heating relay negative terminal voltage.It is acquired in conjunction with above-mentioned anode voltage collection circuit 122
Battery anode voltage, be from battery it is positive and negative between voltage charge to stagnation pressure charge-discharge circuit 130.
In one embodiment, as shown in fig. 7, stagnation pressure charge-discharge circuit 130 includes CBB electric capacity C3, the first optocoupler Q4, the
Ten current-limiting resistance R11, the 11st current-limiting resistance R12, the 12nd current-limiting resistance R13 and the 13rd current-limiting resistance R10, CBB electric capacity
The first end of C3 connects the first end of the tenth current-limiting resistance R11 and one end of stagnation pressure Acquisition Circuit 120, the tenth current-limiting resistance R11
First end connect stagnation pressure charge-discharge circuit 130, the second end of CBB electric capacity C3 connects the second end of the 12nd current-limiting resistance R13
With the other end of stagnation pressure Acquisition Circuit 120, the second end of the 12nd current-limiting resistance R13 connects stagnation pressure charge-discharge circuit 130, and the tenth
The second end of current-limiting resistance R11 connects the first end of the 11st current-limiting resistance R12, and the second end of the 11st current-limiting resistance R12 connects
4 feet and 6 feet of the first optocoupler Q4 are connect, 5 feet of the first optocoupler Q4 connect the second end of the 12nd current-limiting resistance R13, the 13rd limit
The first end of leakage resistance R10 connects positive digital supply voltage DVCC, and the second end of the 13rd current-limiting resistance R10 connects the first optocoupler
2 feet of 1 foot of Q4, the first optocoupler Q4 connect control circuit 110.
Specifically, the 7th control terminal VOLT7 of the 2 feet connection control circuit 110 of the first optocoupler Q4, the of CBB electric capacity C3
One end connects 5 feet, 7 feet of 5 feet of the first high pressure optocoupler Q1 in stagnation pressure Acquisition Circuit 120,7 feet and the second high pressure optocoupler Q2,
5 feet and 7 feet of low pressure optocoupler Q3 in the second end connection stagnation pressure Acquisition Circuit 120 of CBB electric capacity C3, stagnation pressure Acquisition Circuit 120
The voltage of acquisition is used to charge to CBB electric capacity C3, and the first optocoupler Q4 is used for the control signal conduction according to control circuit 110, always
Voltage by the 11st current-limiting resistance R12, the 12nd current-limiting resistance R13 and the 13rd current-limiting resistance R10, the first optocoupler Q4 and
CBB electric capacity C3 discharges in this circuit, and the CBB electric capacity C3 total voltage stored has been discharged, the mistake of CBB charge and discharge is utilized
Journey, high pressure is completely isolated with low-voltage circuit, and insulation resistance increases, and low-voltage circuit stability greatly improves, and is also improving BMS just
Normal reliability of operation.
In one embodiment, stagnation pressure counting circuit 140 includes the second optocoupler Q5,142 and of operational amplifier bleeder circuit
Filter regulator circuit 144,1 foot of the second optocoupler Q5 connect positive digital supply voltage DVCC, and 2 feet of the second optocoupler Q5 connect 3 feet,
8 feet of second optocoupler Q5 connect stagnation pressure charge-discharge circuit 130, and 6 feet of the second optocoupler Q5 connect stagnation pressure charge-discharge circuit 130, the
7 feet of two optocoupler Q5 and 5 feet connect operational amplifier bleeder circuit 142, and 4 feet of the second optocoupler Q5 connect control circuit 110, fortune
It calculates amplifier bleeder circuit 142 and connects filter regulator circuit 144.
Specifically, the 8th control terminal VOLT8 of the 4 feet connection control circuit 110 of the second optocoupler Q5, stagnation pressure counting circuit
The first end of the tenth current-limiting resistance R11 in the 8 feet connection stagnation pressure charge-discharge circuit 130 of 140 the second optocoupler Q5, stagnation pressure calculate
The second end of the 12nd current-limiting resistance R13 in the 8 feet connection stagnation pressure charge-discharge circuit 130 of second optocoupler Q5 of circuit 140.Always
The CBB electric capacity C3 of pressure charge-discharge circuit 130 is charged to ceiling voltage, and control circuit 110 controls stagnation pressure counting circuit 140 and carries out always
Press calculating process.High pressure optocoupler and low pressure optocoupler Q3 shutdown are controlled, the second optocoupler Q5 is open-minded, operational amplifier bleeder circuit 142
Sampling stagnation pressure obtains feedback voltage, passes through filter regulator circuit 144 after stagnation pressure partial pressure and feeds back to single-chip microcontroller 112, according to stagnation pressure
Size obtains monitored results, judges battery management system whether normal operation.
In one embodiment, as shown in figure 8, operational amplifier bleeder circuit 142 includes operational amplifier, the first isolation
Resistance R14, the second isolation resistance R17, third isolation resistance R15, the 4th isolation resistance R18, the first divider resistance R21, second
The second isolation is connected in series in divider resistance R22, third divider resistance R19 and the 4th divider resistance R20, the first isolation resistance R14
The 4th isolation resistance R18 is connected in series in resistance R17, third isolation resistance R15, and the first divider resistance R21 is connected in series second point
The 4th divider resistance R20, the first end connection of the first isolation resistance R14 is connected in series in piezoresistance R22, third divider resistance R19
5 feet of second optocoupler Q5, the second end of the second isolation resistance R17 connect the reverse phase of the first divider resistance R21 and operational amplifier
The common end of input terminal, the first end of third isolation resistance R15 connect 7 feet of the second optocoupler Q5, and the of the 4th isolation resistance R18
The common end of the non-inverting input terminal of two ends connection third divider resistance R19 and operational amplifier, the second of the 4th divider resistance R20
End ground connection, the second divider resistance R22 second end connection operational amplifier output end and filter regulator circuit 144 it is public
End, the positive simulation supply voltage AVCC of positive supply input terminal connection of operational amplifier, the negative supply input terminal of operational amplifier connect
Connect the common end of the 4th divider resistance R20 and filter regulator circuit 144.
Specifically, operational amplifier calculates stagnation pressure size, and the first isolation resistance R14 and the second isolation resistance R17 are anode
The isolation resistance of voltage, third isolation resistance R15 and the 4th isolation resistance R18 are the isolation resistance of negative terminal voltage, while being fortune
The divider resistance of amplifier is calculated, and the resistance value of the first isolation resistance R14 to the 4th isolation resistance R18 is identical, the first partial pressure electricity
The resistance value for hindering R21 to the 4th divider resistance R20 is identical, and the voltage value size obtained after operational amplifier partial pressure is total voltage *
First divider resistance R21/ the first isolation resistance R14 improves the reliable and stable performance of BMS normal operation.
In one embodiment, filter regulator circuit includes the 14th current-limiting resistance R23, filter capacitor C5, the one or two pole
Pipe and the second diode, the first end of the 14th current-limiting resistance R23 connect operational amplifier bleeder circuit, and the of filter capacitor C5
One end connects the second end of the 14th current-limiting resistance R23, and the second end of filter capacitor C5 connects operational amplifier bleeder circuit, the
One diode and the connection of the second Diode series, the cathode of first diode connect and just simulate supply voltage AVCC, and the two or two
The second end of the anode connection filter capacitor C5 of pole pipe, first diode connect output end with the common end of the second diode.
Specifically, filter capacitor C5 is used to filter out clutter in voltage, improves the accuracy of voltage, first diode and
Second Diode series realize pressure stabilizing, and filter regulator circuit increases whole for realizing the Stability and veracity of the voltage of output
The accuracy of the monitored results of a stagnation pressure monitoring circuit.
In one embodiment, stagnation pressure counting circuit 140 further includes the 16th current-limiting resistance R16 and the first filter capacitor
One end of C5, the 16th current-limiting resistance R16 connect positive digital supply voltage DVCC, and the other end connects 1 foot of the second optocoupler Q5, the
One end of one filter capacitor C5 is grounded, the positive supply input terminal of the positive simulation supply voltage AVCC and operational amplifier of other end connection
Common end.
To acquire VBAT-H, VBAT-L, that is, battery it is total just it is total it is negative between voltage this all the way for be illustrated, first
Single-chip microcontroller 112 controls the first 3-8 decoder 1142 and the 2nd 3-8 decoder 1144, as shown in figure 5, the letter that single-chip microcontroller 112 exports
Number VOLT-CON_4, VOLT-CON_3, VOLT-CON_2, the low and high level of VOLT-CON_1 is L, H, H, L respectively, is translated by 3-8
The principle of code device obtains, and the input of the first address decoder 1142U1 3-8 is 110, so only/Y6 exports low level, then VOLT3
For low level, the input of the 2nd address decoder 1144U2 3-8 is 000, so only/Y0 exports low level, then VOLT5 is low electricity
It is flat.
The total voltage acquired all the way is selected, is charged to CBB electric capacity C3, as shown in fig. 6, only VOLT3, VOLT5 two controls
Signal processed is low level, so the second high pressure optocoupler Q2, the optocoupler of the top half of low pressure optocoupler Q3 is open-minded, the acquisition corresponded to
Voltage is VBAT-H, VBAT-L respectively, i.e., battery strings it is total just it is total it is negative between voltage, stagnation pressure is filled to CBB electric capacity C3 all the way for this
Electricity is charged to ceiling voltage.
Single-chip microcontroller 112 changes control signal, stops charging process, carries out total voltage calculating process.As shown in figure 5, monolithic
The low and high level of signal VOLT-CON_3, VOLT-CON_2, VOLT-CON_1 that machine 112 exports are L, H, L respectively this moment.This moment
VOLT-CON_3 become low level, so the 2nd 3-8 decoder 1144U2 this decoder does not enable, output level is all
It is high.And the input address of the first 3-8 decoder 1142U1 is 010, so only/Y2 exports low level, then VOLT8 is low electricity
It is flat.Therefore the second high pressure optocoupler Q2 is had turned off, low pressure optocoupler Q3 has opened the second optocoupler Q5.As shown in figure 8, to utilize fortune
It calculating amplifier U3 and calculates stagnation pressure size, R14, the isolation resistance of R17 anode voltage, R15, R18 are the isolation resistances of negative terminal voltage,
It is the divider resistance of operational amplifier, and divider resistance resistance value R14=R15=R17=R18, R19=R20=R21=simultaneously
R22, the voltage value size that partial pressure obtains later are total voltage * R19/R14, pass through subsequent filtering voltage regulation after total voltage partial pressure
Circuit is input to single-chip microcontroller 112 and calculates stagnation pressure size.
Finally, stopping stagnation pressure calculating process, stagnation pressure discharge process is carried out.After single-chip microcontroller 112 calculates voltage, such as Fig. 5
Shown, the low and high level of signal VOLT-CON_3, VOLT-CON_2, VOLT-CON_1 that single-chip microcontroller 112 exports are respectively this moment
L, L, H, VOLT-CON_3 or low level this moment, so the 2nd 3-8 decoder 1144U2 this decoder does not still enable,
Output level is still all height.And the input address of the first 3-8 decoder 1142U1 is 001, so only/Y1 exports low electricity
Flat, then VOLT7 is low level.Therefore the second optocoupler Q5 is had turned off, has opened the first optocoupler Q4, as shown in fig. 7, total voltage is passed through
Resistance R11, R12, the first optocoupler Q4, resistance R13 and CBB electric capacity C3 discharge in this circuit, CBB electric capacity C3 storage
Total voltage has been discharged.It here it is a cycle of stagnation pressure Acquisition Circuit 120, then proceedes to charge, calculate, discharge process recycles past
It is multiple.
Above-mentioned battery management system total voltage monitors circuit, and it is open-minded to control two 3-8 decoders selections by single-chip microcontroller 112
The optocoupler of total voltage all the way when CBB electric capacity C3 is charged to ceiling voltage, controls two 3-8 and translates for charging to CBB electric capacity C3
Code device shutdown selects the optocoupler of total volt circuit, and the optocoupler for opening calculating stagnation pressure is obtained by operational amplifier bleeder circuit
Voltage value be input to single-chip microcontroller 112, after single-chip microcontroller 112 calculates total voltage, control the shutdown of two 3-8 decoders calculate it is total
The optocoupler of pressure opens the optocoupler of discharge circuit, discharges, and here it is a cycles of total pressure measurement, then recharges meter
Electric discharge is calculated, is moved in circles, whether real-time monitoring battery management system stagnation pressure is normal.Stagnation pressure counting circuit 140 can be with sampling multiple
Any road voltage in stagnation pressure obtains corresponding feedback voltage, does not need to correspond to increase component with the increase of stagnation pressure all the way
Quantity, therefore, entire battery management system total voltage monitoring circuit greatly reduces the quantity using component, PCB route
The placing space of plate decreases, and cost greatly reduces.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of battery management system total voltage monitors circuit, which is characterized in that including control circuit, stagnation pressure Acquisition Circuit, total
Charge-discharge circuit and stagnation pressure counting circuit are pressed, the control circuit connects the stagnation pressure Acquisition Circuit, stagnation pressure charge and discharge electricity
Road and the stagnation pressure counting circuit, the stagnation pressure Acquisition Circuit connect the stagnation pressure charge-discharge circuit, the stagnation pressure charge and discharge electricity
Road connects the stagnation pressure counting circuit,
The control circuit is for sending first control signal to the stagnation pressure Acquisition Circuit；Detecting stagnation pressure charge-discharge circuit
Voltage when reaching predeterminated voltage, send second control signal to the stagnation pressure counting circuit；Receive the stagnation pressure counting circuit
The feedback voltage of transmission obtains monitored results according to the feedback voltage and exports；And it sends third and controls signal to described
Stagnation pressure charge-discharge circuit；
The stagnation pressure Acquisition Circuit is for any road in the first control signal access battery management system based on the received
Total voltage is simultaneously sent to the stagnation pressure charge-discharge circuit；
The stagnation pressure charge-discharge circuit charges for total voltage based on the received；And the third control based on the received
Signal discharges；
After the stagnation pressure counting circuit charges to the stagnation pressure charge-discharge circuit for the second control signal based on the received
Voltage sampled, obtain feedback voltage and be sent to the control circuit.
2. battery management system total voltage according to claim 1 monitors circuit, which is characterized in that the control circuit packet
Single-chip microcontroller and decoder selection circuit are included, the single-chip microcontroller connects the stagnation pressure acquisition electricity by the decoder selection circuit
Road, the stagnation pressure charge-discharge circuit and the stagnation pressure counting circuit, the single-chip microcontroller connect the stagnation pressure counting circuit,
The single-chip microcontroller is for sending the first decoder address signal to the decoder selection circuit；Detecting stagnation pressure
When the voltage of charge-discharge circuit reaches predeterminated voltage, sends the second decoder address signal to the decoder and select electricity
Road；The feedback voltage that the stagnation pressure counting circuit is sent is received, monitored results are obtained according to the feedback voltage and are exported；And
Third decoder address signal is sent to the decoder selection circuit；
The decoder selection circuit sends the first control letter for the first decoder address signal based on the received
Number to the stagnation pressure Acquisition Circuit；The second decoder address signal sends second control signal to institute based on the received
State stagnation pressure counting circuit；And the third decoder address signal sends third and controls signal to described based on the received
Stagnation pressure charge-discharge circuit.
3. battery management system total voltage according to claim 2 monitors circuit, which is characterized in that the decoder selection
Circuit includes the first 3-8 decoder and the 2nd 3-8 decoder, and the first 3-8 decoder connects the stagnation pressure Acquisition Circuit, institute
Stagnation pressure charge-discharge circuit and the stagnation pressure counting circuit are stated, the 2nd 3-8 decoder connects the stagnation pressure Acquisition Circuit.
4. battery management system total voltage according to claim 1 monitors circuit, which is characterized in that the stagnation pressure acquisition electricity
Road includes anode voltage collection circuit and negative terminal voltage Acquisition Circuit, and the anode voltage collection circuit and the negative terminal voltage are adopted
Collector connects the stagnation pressure charge-discharge circuit and the control circuit.
5. battery management system total voltage according to claim 4 monitors circuit, which is characterized in that the anode voltage is adopted
Collector includes the first current-limiting resistance, the second current-limiting resistance, third current-limiting resistance, the 4th current-limiting resistance, the 5th current-limiting resistance, the
Six current-limiting resistances, the first high pressure optocoupler and the second high pressure optocoupler,
The anode voltage of first end connection the first heating relay of first current-limiting resistance, the of first current-limiting resistance
Two ends connect 8 feet of the first high pressure optocoupler, and the second heating of first end connection relay of second current-limiting resistance is just
Voltage is held, the second end of second current-limiting resistance connects 6 feet of the first high pressure optocoupler, and the of the third current-limiting resistance
One end connects 1 foot and 3 feet of the first high pressure optocoupler, the second end connection positive digital power supply electricity of the third current-limiting resistance
Pressure, 7 feet of the first high pressure optocoupler and 5 feet connect the stagnation pressure charge-discharge circuit, the 2 feet connection of the first high pressure optocoupler
4 feet of the control circuit, the first high pressure optocoupler connect the control circuit；
The anode voltage of the first end connection battery of 4th current-limiting resistance, the second end of the 4th current-limiting resistance connect institute
State 8 feet of the second high pressure optocoupler, the anode voltage of the total positive relay of the first end connection of the 5th current-limiting resistance, the described 5th
The second end of current-limiting resistance connects 6 feet of the second high pressure optocoupler, the first end connection of the 6th current-limiting resistance described the
1 foot and 3 feet of two high pressure optocouplers, the second end connection positive digital supply voltage of the 6th current-limiting resistance, described second
7 feet of high pressure optocoupler and 5 feet connect the stagnation pressure charge-discharge circuit, and 2 feet of the second high pressure optocoupler connect the control electricity
4 feet on road, the second high pressure optocoupler connect the control circuit.
6. battery management system total voltage according to claim 4 monitors circuit, which is characterized in that the negative terminal voltage is adopted
Collector includes the 7th current-limiting resistance, the 8th current-limiting resistance, the 9th current-limiting resistance and low pressure optocoupler, the 7th current-limiting resistance
First end connects the negative terminal voltage of battery, and the second end of the 7th current-limiting resistance connects 8 feet of the low pressure optocoupler, and described the
The negative terminal voltage of the total positive relay of the first end connection of eight current-limiting resistances, the second end connection of the 8th current-limiting resistance are described low
6 feet of press polish coupling, the first end of the 9th current-limiting resistance connect 1 foot and 3 feet of the low pressure optocoupler, the 9th current limliting electricity
The second end of resistance connects positive digital supply voltage, and 7 feet of the low pressure optocoupler and 5 feet connect the stagnation pressure charge-discharge circuit, institute
2 feet for stating high pressure optocoupler connect the control circuit, and 4 feet of the low pressure optocoupler connect the control circuit.
7. battery management system total voltage according to claim 1 monitors circuit, which is characterized in that the stagnation pressure charge and discharge
Circuit includes CBB electric capacity, the first optocoupler, the tenth current-limiting resistance, the 11st current-limiting resistance, the 12nd current-limiting resistance and the 13rd limit
Leakage resistance, the first end of the CBB electric capacity connect the tenth current-limiting resistance first end and the stagnation pressure Acquisition Circuit one
It holds, the first end connection stagnation pressure charge-discharge circuit of the tenth current-limiting resistance, described in the second end connection of the CBB electric capacity
The second end of the other end of the second end of 12nd current-limiting resistance and the stagnation pressure Acquisition Circuit, the 12nd current-limiting resistance connects
The stagnation pressure charge-discharge circuit is connect, the second end of the tenth current-limiting resistance connects the first end of the 11st current-limiting resistance,
The second end of 11st current-limiting resistance connects 4 feet and 6 feet of first optocoupler, and 5 feet of first optocoupler connect institute
State the second end of the 12nd current-limiting resistance, the first end of the 13rd current-limiting resistance connects positive digital supply voltage, and described the
The second end of 13 current-limiting resistances connects 1 foot of first optocoupler, and 2 feet of first optocoupler connect the control circuit.
8. battery management system total voltage according to claim 1 monitors circuit, which is characterized in that the stagnation pressure calculates electricity
Road includes the second optocoupler, operational amplifier bleeder circuit and filter regulator circuit, the 1 foot connection positive digital electricity of second optocoupler
Source voltage, 2 feet of second optocoupler connect 3 feet, and 8 feet of second optocoupler connect the stagnation pressure charge-discharge circuit, described
6 feet of the second optocoupler connect the stagnation pressure charge-discharge circuit, and 7 feet of second optocoupler and 5 feet connect the operational amplifier
Bleeder circuit, 4 feet of second optocoupler connect the control circuit, and the operational amplifier bleeder circuit connects the filtering
Voltage regulator circuit.
9. battery management system total voltage according to claim 8 monitors circuit, which is characterized in that the operational amplifier
Bleeder circuit includes operational amplifier, the first isolation resistance, the second isolation resistance, third isolation resistance, the 4th isolation resistance,
Institute is connected in series in one divider resistance, the second divider resistance, third divider resistance and the 4th divider resistance, first isolation resistance
The second isolation resistance is stated, the 4th isolation resistance, the first divider resistance series connection is connected in series in the third isolation resistance
Second divider resistance is connected, the 4th divider resistance, the first isolation electricity is connected in series in the third divider resistance
The first end of resistance connects 5 feet of second optocoupler, and the second end of second isolation resistance connects first divider resistance
Second optocoupler is connected with the first end of the common end of the inverting input terminal of the operational amplifier, the third isolation resistance
7 feet, the second end of the 4th isolation resistance connects the homophase input of the third divider resistance and the operational amplifier
The common end at end, the second end ground connection of the 4th divider resistance, the second end of second divider resistance connect the operation
The positive supply input terminal of the common end of the output end of amplifier and the filter regulator circuit, the operational amplifier connects holotype
The negative supply input terminal of quasi- supply voltage, the operational amplifier connects the 4th divider resistance and the filter regulator circuit
Common end.
10. battery management system total voltage according to claim 8 monitors circuit, which is characterized in that the filtering voltage regulation
Circuit includes the 15th current-limiting resistance, filter capacitor, first diode and the second diode, and the of the 15th current-limiting resistance
One end connects the operational amplifier bleeder circuit, and the first end of the filter capacitor connects the of the 11st current-limiting resistance
The second end at two ends, the filter capacitor connects the operational amplifier bleeder circuit, the first diode and described second
Diode series connection, the positive simulation supply voltage of cathode connection of the first diode, the anode of second diode
The second end of the filter capacitor is connected, the first diode connects output end with the common end of second diode.
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