CN105048007A - Battery management circuit used in electrical vehicle - Google Patents
Battery management circuit used in electrical vehicle Download PDFInfo
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- CN105048007A CN105048007A CN201510053850.2A CN201510053850A CN105048007A CN 105048007 A CN105048007 A CN 105048007A CN 201510053850 A CN201510053850 A CN 201510053850A CN 105048007 A CN105048007 A CN 105048007A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a battery management circuit used in electrical vehicles. The battery management circuit includes a battery voltage sampling circuit, a battery current sampling circuit, a battery temperature sampling circuit, an analog multiple switching hardware circuit, an environmental temperature sampling circuit, a second-order filtering and sampling maintenance circuit, a DSP A/D protective circuit and a CAN communication circuit. By means of the technical scheme, status of charging and discharging process of a battery can be monitored dynamically. According to collected information of the battery, the present status of the battery can be determined so that a further measurement can be adopted. By means of the technical scheme, data such as voltage, current, temperature and the like can be accurately measured. Meanwhile, by means of DSP as a control chip, the system is quick in responding, and meanwhile is complete in function, is easy to operate, is strong in reliability and can be used in the electrical vehicles practically.
Description
Technical field
The invention belongs to battery for electric automobile management domain, particularly relate to a kind of battery for electric automobile management system circuit.
Technical background
Along with the exhaustion of regenerative resource in world wide, and environmental problem worsens, and electric vehicle engineering obtains at world's every country and develops rapidly, and then facilitates the development of on-vehicle battery and administrative skill thereof.On-vehicle battery is a key technology of Development of Electric Vehicles, and battery management system is the core of on-vehicle battery, so the research and development of battery management system are more and more paid attention in countries in the world.China's research is in this respect started late, but development is very fast, have developed some products at present and has carried out production in batches and application.Along with the development of electric automobile, also more and more higher to the certainty of measurement of the data such as voltage, electric current, temperature of battery, the estimation of dump energy is more and more accurate, manages more and more specification.
Summary of the invention
The object of the present invention is to provide a kind of battery for electric automobile management system circuit, this circuit can the data such as comparatively accurate measuring voltage, electric current, temperature, and simultaneously owing to adopting DSP as control chip, the response speed of system is also very fast.
The present invention includes battery voltage sampling circuit, battery current sample circuit, battery temperature sample circuit, analog multichannel switch hardware circuit, ambient temperature sample circuit, second-order filter and sampling hold circuit, DSPA/D protective circuit, CAN communication circuit.
Battery voltage sampling circuit comprises the first swept resistance R1, the second swept resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6; First electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4; First operational amplifier LM1, the second operational amplifier LM2; First diode D1.
One end ground connection of the first electric capacity C1, the other end is connected with the negative pole of batteries, one end of the first swept resistance R1 respectively; One end ground connection of the second electric capacity C2, the other end is connected with the positive pole of batteries, one end of the second swept resistance R2 respectively; The tap terminals of the first swept resistance R1 is connected with one end of the 4th resistance R4, the other end of the first swept resistance R1, the inverting input of the first operational amplifier LM1 respectively; The tap terminals of the second swept resistance R2 is connected with one end of the 3rd resistance R3, the other end of the second swept resistance R2, the in-phase input end of the first operational amplifier LM1 respectively, the other end ground connection of the 3rd resistance R3; The other end of the 3rd resistance R4 is connected with the output of the first operational amplifier LM1, one end of the 5th resistance R5 respectively; The other end of the 5th resistance R5 is connected with one end of the 3rd electric capacity C3, the in-phase input end of the second operational amplifier LM2 respectively.
The in-phase input end of the second operational amplifier LM2 is connected with the other end of the 5th resistance R5, one end of the 3rd electric capacity C3 respectively, and inverting input is connected with one end of the 6th resistance R6, the output of the second operational amplifier LM2 respectively.
The other end of the 6th resistance R6 is connected with one end of the 4th electric capacity C4, the negative electrode of the first diode D1 respectively, and as the output of whole battery voltage sampling circuit; The other end of the 4th electric capacity C4 is connected with the anode of the first diode D1 and ground connection.
Battery current sample circuit comprises the first Hall current sensor H1; 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 11 resistance R11, the 12 resistance R12; 3rd operational amplifier LM3, four-operational amplifier LM4.
The pin 5 of the first Hall current sensor H1 connects the positive pole of batteries, and pin 4 connects the negative pole of batteries, and pin 1 connects+15V power supply, and pin 2 connects-15V power supply, and pin 3 is connected with one end of the 7th resistance R7, one end of the 8th resistance R8 respectively; The other end ground connection of the 7th resistance R7, the other end of the 8th resistance R8 is connected with the inverting input of the 3rd operational amplifier LM3.
The in-phase input end ground connection of the 3rd operational amplifier LM3, inverting input is connected with the other end of described 8th resistance R8, output is connected with one end of the 9th resistance R9, one end of the tenth resistance R10 respectively, and the other end of the 9th resistance R9 connects+15V power supply by the 11 resistance R11; The other end of the tenth resistance R10 is connected with one end of the 12 resistance R12, the inverting input of four-operational amplifier LM4 respectively.
The in-phase input end ground connection of four-operational amplifier LM4, inverting input is connected with the other end of the tenth resistance R10, one end of the 12 resistance R12 respectively; The other end of the 12 resistance R12 is connected with the output of four-operational amplifier LM4; The output of four-operational amplifier LM4 is as the output of whole battery current sample circuit.
Battery temperature sample circuit comprises the 13 resistance R13, the 14 resistance R14, the 15 resistance R15, the 16 resistance R16, the 17 resistance R17, the 18 resistance R18, the 19 resistance R19, the first thermistor PTC1; 5th polar capacitor C5, the 6th polar capacitor C6, the 7th electric capacity C7, the 8th electric capacity C8; 5th operational amplifier LM5, the 6th operational amplifier LM6;
The negative pole of the 5th polar capacitor C5, the negative pole of the 6th polar capacitor C6, one end of the 7th electric capacity C7, one end of the 8th electric capacity C8 are connected with one end of the 13 resistance R13, one end of the first thermistor PTC1 respectively, simultaneously ground connection; The positive pole of the 5th polar capacitor C5, the other end of the 7th electric capacity C7 are connected with the other end of the 13 resistance R13, one end of the 14 resistance R14 respectively, are connected with the inverting input of the 5th operational amplifier LM5 simultaneously; The other end of the 14 resistance R14 is connected with one end of the 15 resistance R15, connects+15V power supply simultaneously; The other end of the 15 resistance R15 is connected with the other end of the first thermistor PTC1, the positive pole of the 6th polar capacitor C6, the other end of the 8th electric capacity C8 respectively, sends into the in-phase input end of the 6th operational amplifier LM6 simultaneously.
The in-phase input end of the 5th operational amplifier LM5 is connected with one end of the 16 resistance R16, one end of the 17 resistance R17 respectively, the other end ground connection of the 17 resistance R17, the other end of the 16 resistance R16 is connected with the output of the 5th operational amplifier LM5, one end of the 18 resistance R18 respectively; The inverting input of the 6th operational amplifier LM6 is connected with the other end of the 18 resistance R18, one end of the 19 resistance R19 respectively, and the other end of the 19 resistance R19 is connected with the output of the 6th operational amplifier LM6; The output of the 6th operational amplifier LM6 is as the output of whole battery temperature sample circuit.
Analog multichannel switch hardware circuit comprises 24 road battery BAT1-BAT24; 24 diodes (the second diode D2-the 25 diode D25); First analog switch CD1, the second analog switch CD2; First inverter NOT1; 20 resistance R20.
The positive pole of every road battery of 24 road batteries is connected with the anode of a diode, and the negative electrode of diode is connected with the BAT+ input of battery voltage sampling circuit; The negative pole of every road battery of 24 road batteries is connected with the BAT-input of battery voltage sampling circuit; Every road battery is numbered AS1-AS24 through the output of battery voltage sampling circuit is identical with battery.
One end of 20 resistance R20 is connected with the pin 1 of pin 1, the second analog switch CD2 of the first analog switch CD1 respectively, and the other end is as output; The pin 24 of pin 24, the second analog switch CD2 of the first analog switch CD1 connects+15V power supply simultaneously.
Pin 12 ground connection simultaneously of pin 12, the second analog switch CD2 of the first analog switch CD1; The pin 10 of pin 10, the second analog switch CD2 of the first analog switch CD1 is simultaneously as a-signal input; The pin 11 of pin 11, the second analog switch CD2 of the first analog switch CD1 is simultaneously as B signal input part; The pin 14 of pin 14, the second analog switch CD2 of the first analog switch CD1 is simultaneously as C signal input part; The pin 13 of pin 13, the second analog switch CD2 of the first analog switch CD1 is simultaneously as D signal input part; The pin 15 of the second analog switch CD2 is connected with the pin 15 of the first analog switch CD1 by the first inverter NOT1; The pin of the second analog switch CD2 according to pin 9-pin 2, then is AS1-AS16 from the serial number of pin 23-pin 16; The pin of the first analog switch (CD1) is AS17-AS24 according to the serial number of pin 9-pin 2.
Ambient temperature sample circuit comprises the 9th electric capacity C9, the tenth electric capacity C10; 21 resistance R21, the 22 resistance R22, the 23 swept resistance R23, the 24 resistance R24, the 25 resistance R25, the 26 resistance R26; First integrated temperature sensor U1; One NPN triode Q1, the 2nd NPN triode Q2.
The pin 1 of the first integrated temperature sensor U1 is connected with one end of the 9th electric capacity C9, connects+15V power supply simultaneously, the other end ground connection of the 9th electric capacity C9; The pin 2 of the first integrated temperature sensor U1 is connected with one end of the tenth electric capacity C10, the inverting input of the 7th operational amplifier LM7 respectively, and the other end of the tenth electric capacity C10 is connected with one end of the 22 resistance R22, connects+15V power supply simultaneously; Pin 3 ground connection of the first integrated temperature sensor U1; The pin 4 of the first integrated temperature sensor U1 is connected with one end of the 21 resistance R21, the other end ground connection of the 21 resistance R21.
One end of 22 resistance R22 is connected with one end of the 9th electric capacity C9, connects+15V power supply simultaneously, and the other end is connected with one end of the 23 swept resistance R23; The other end of the 23 swept resistance R23 is connected with one end of the 24 resistance R24, the other end ground connection of the 24 resistance R24; The centre cap of the 23 swept resistance R23 is connected with the in-phase input end of the 7th operational amplifier LM7.
The in-phase input end of the 7th operational amplifier LM7 is connected with the centre cap of the 23 swept resistance R23, and inverting input is connected with the pin 2 of the first integrated temperature sensor U1, and output is connected with the base stage of a NPN triode Q1.
One termination+15V the power supply of the 25 resistance R25, the other end is connected with the collector electrode of a NPN triode Q1, the collector electrode of the 2nd NPN triode Q2 respectively; One end of 26 resistance R26 is connected with the emitter of a NPN triode Q1, the base stage of the 2nd NPN triode Q2 respectively, other end ground connection; The grounded emitter of the 2nd NPN triode Q2.
Second-order filter and sampling hold circuit comprise the 27 resistance R27, the 28 resistance R28, the 29 resistance R29; 11 electric capacity C11, the 12 electric capacity C12, the 13 electric capacity C13; 8th operational amplifier LM8; First sampling holder SH1.
One end of 27 resistance R27 and the output of battery voltage sampling circuit, or be connected with the output of battery current sample circuit, the other end is connected with one end of the 11 electric capacity C11, one end of the 28 resistance R28 respectively; The other end of the 11 electric capacity C11 is connected with the output of the 8th operational amplifier LM8, the pin 3 of the first sampling holder SH1 respectively; The other end of the 28 resistance R28 is connected with one end of the 12 electric capacity C12, one end of the 29 resistance R29 respectively, the other end ground connection of the 12 electric capacity (C12), the other end of the 29 resistance R29 is connected with the in-phase input end of the 8th operational amplifier LM8.
The inverting input of the 8th operational amplifier LM8 is connected with the output of the 8th operational amplifier LM8.
The pin 1 of the first sampling holder SH1 connects+15V power supply, and pin 4 connects-15V power supply, and pin 6 is connected with one end of the 13 electric capacity C13; The other end of the 13 electric capacity C13 is connected with the pin 7 of the first sampling holder SH1, simultaneously ground connection; The pin 8 of the first sampling holder SH1 is connected with the IOPB3 of DSP, and pin 5 is as the output of whole second-order filter and sample circuit.
DSPA/D protective circuit comprises the 30 resistance R30; 14 electric capacity C14; 26 diode D26; First voltage-stabiliser tube DZ1.
One end of described 30 resistance R30 is as signal input part, and the other end is connected with one end of the 14 electric capacity C14, the anode of the 26 diode D26, the negative electrode of the first voltage-stabiliser tube DZ1, the input of DSP respectively; The other end ground connection of the 14 electric capacity C14, the negative electrode D26 of the 26 diode connects+3.3V power supply, the first voltage-stabiliser tube (DZ1) plus earth.
CAN communication circuit comprises the second CAN transceiving chip U2; 31 resistance R31, the 32 resistance R32, the 33 resistance R33; 15 electric capacity C15, the 16 electric capacity C16; 27 diode D27, the 28 diode D28; First CAN interface CAN1.
Second CAN transceiving chip U2 pin 1 connects CANTX signal, pin 2 ground connection, and pin 3 connects+15V power supply, and pin 4 connects CANRX signal, and pin 6 is connected with one end of the 32 resistance R32, and pin 7 is connected with one end of the 31 resistance R31, pin 8 ground connection.
The other end of the 31 resistance R31 is connected with one end of the 15 electric capacity C15, the negative electrode of the 27 diode D27, one end of the 33 resistance R33 respectively; The other end of the 32 resistance R32 is connected with one end of the 16 electric capacity C16, the negative electrode of the 28 diode D28, the other end of the 33 resistance R33 respectively; The anode of the other end of the 15 electric capacity C15, the other end of the 16 electric capacity C16, the 27 diode D27, the anode of the 28 diode D28 ground connection simultaneously; One end of 33 resistance R33 is connected with the pin 7 of the first CAN interface CAN1, and the other end is connected with the pin 2 of the first CAN interface CAN1.
The pin 5 of the first CAN interface CAN1 is connected with pin 1, pin 6 respectively, and pin 9 is connected with pin 8, pin 6 respectively, and pin 4 is connected with pin 5, pin 3, pin 6 respectively, and pin 8 is connected with pin 9, pin 6 respectively.
Second-order filter and sample circuit have two in the entire system, and one is connected with the output of analog multichannel switch hardware circuit, and another is connected with the output of battery current sample circuit, and the LIN end of two circuit is all received on the IOPB3 of DSP.
Whole circuit needs four DSPA/D protective circuits, respectively at two second-order filters and between sample circuit and DSPA/D interface, between battery temperature sample circuit and DSPA/D interface, between ambient temperature sample circuit and DSPA/D interface.
Whole system also has a safety switch, an erasable and programable memory EEPROM.
Accompanying drawing explanation
Be illustrated in figure 1 the structured flowchart of a kind of battery for electric automobile management system circuit of the present invention.
Be illustrated in figure 2 the battery voltage sampling circuit schematic diagram of a kind of battery for electric automobile management system circuit of the present invention.
Be illustrated in figure 3 the battery current sample circuit schematic diagram of a kind of battery for electric automobile management system circuit of the present invention.
Be illustrated in figure 4 the battery temperature sample circuit schematic diagram of a kind of battery for electric automobile management system circuit of the present invention.
Be illustrated in figure 5 the analog switch hardware circuit principle figure of a kind of battery for electric automobile management system circuit of the present invention.
Be illustrated in figure 6 the ambient temperature sample circuit schematic diagram of a kind of battery for electric automobile management system circuit of the present invention.
Be illustrated in figure 7 second-order filter and the sampling hold circuit schematic diagram of a kind of battery for electric automobile management system circuit of the present invention.
Be illustrated in figure 8 the DSPA/D protective circuit schematic diagram of a kind of battery for electric automobile management system circuit of the present invention.
Be illustrated in figure 9 the CAN communication circuit schematic diagram of a kind of battery for electric automobile management system circuit of the present invention.
Embodiment
Below in conjunction with Fig. 1-Fig. 9 the present invention done and further elaborate.
Be illustrated in figure 1 the structured flowchart of a kind of battery for electric automobile management system circuit of the present invention.Comprise battery voltage sampling circuit, battery current sample circuit, battery temperature sample circuit, analog multichannel switch hardware circuit, ambient temperature sample circuit, second-order filter and sampling hold circuit, DSPA/D protective circuit, CAN communication circuit.Whole system, passing through second-order filter and sample circuit afterwards to the sampling of cell voltage, electric current, is sent into dsp chip, is completed the data acquisition of cell voltage, electric current.Owing to present invention comprises 24 pieces of lead accumulators, and the A/D port of dsp chip is few, realizes so need to add an analog multichannel switch, adopts CD4067 chip.The operating voltage of dsp chip can not higher than 3.3V, therefore need to add DSPA/D protective circuit in dsp chip pin input end simultaneously.After completing the sampling to cell voltage, electric current, carry out calculating and the analysis of data according to internal processes, shown on liquid crystal cell by CAN communication circuit, and realize checking various real time data by keyboard.Simultaneously whole system completes the monitoring to battery temperature and ambient temperature, with ensure battery can in the environment be applicable to steady operation.
Be illustrated in figure 2 the battery voltage sampling circuit schematic diagram of a kind of battery for electric automobile management system circuit of the present invention.Comprise the first swept resistance R1, the second swept resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6; First electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4; First operational amplifier LM1, the second operational amplifier LM2; First diode D1.
One end ground connection of the first electric capacity C1, the other end is connected with the negative pole of batteries, one end of the first swept resistance R1 respectively; One end ground connection of the second electric capacity C2, the other end is connected with the positive pole of batteries, one end of the second swept resistance R2 respectively; The tap terminals of the first swept resistance R1 is connected with one end of the 4th resistance R4, the other end of the first swept resistance R1, the inverting input of the first operational amplifier LM1 respectively; The tap terminals of the second swept resistance R2 is connected with one end of the 3rd resistance R3, the other end of the second swept resistance R2, the in-phase input end of the first operational amplifier LM1 respectively, the other end ground connection of the 3rd resistance R3; The other end of the 3rd resistance R4 is connected with the output of the first operational amplifier LM1, one end of the 5th resistance R5 respectively; The other end of the 5th resistance R5 is connected with one end of the 3rd electric capacity C3, the in-phase input end of the second operational amplifier LM2 respectively.
The in-phase input end of the second operational amplifier LM2 is connected with the other end of the 5th resistance R5, one end of the 3rd electric capacity C3 respectively, and inverting input is connected with one end of the 6th resistance R6, the output of the second operational amplifier LM2 respectively.
The other end of the 6th resistance R6 is connected with one end of the 4th electric capacity C4, the negative electrode of the first diode D1 respectively, and as the output of whole battery voltage sampling circuit; The other end of the 4th electric capacity C4 is connected with the anode of the first diode D1 and ground connection.
This circuit realiration be sampling to single battery terminal voltage.After the voltage range of the A/D port input of the output voltage and DSP that with reference to each battery, design this difference ratio bleeder circuit.In figure, the first swept resistance R1, the second swept resistance R2 are variable resistors, mainly conveniently regulate different output voltages.Output has the voltage-stabiliser tube of a 3.3V, mainly in order to protect the A/D port of DSP.
Be illustrated in figure 3 the battery current sample circuit schematic diagram of a kind of battery for electric automobile management system circuit of the present invention.Comprise the first Hall current sensor H1; 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 11 resistance R11, the 12 resistance R12; 3rd operational amplifier LM3, four-operational amplifier LM4.
The pin 5 of the first Hall current sensor H1 connects the positive pole of batteries, and pin 4 connects the negative pole of batteries, and pin 1 connects+15V power supply, and pin 2 connects-15V power supply, and pin 3 is connected with one end of the 7th resistance R7, one end of the 8th resistance R8 respectively; The other end ground connection of the 7th resistance R7, the other end of the 8th resistance R8 is connected with the inverting input of the 3rd operational amplifier LM3.
The in-phase input end ground connection of the 3rd operational amplifier LM3, inverting input is connected with the other end of described 8th resistance R8, output is connected with one end of the 9th resistance R9, one end of the tenth resistance R10 respectively, and the other end of the 9th resistance R9 connects+15V power supply by the 11 resistance R11; The other end of the tenth resistance R10 is connected with one end of the 12 resistance R12, the inverting input of four-operational amplifier LM4 respectively.
The in-phase input end ground connection of four-operational amplifier LM4, inverting input is connected with the other end of the tenth resistance R10, one end of the 12 resistance R12 respectively; The other end of the 12 resistance R12 is connected with the output of four-operational amplifier LM4; The output of four-operational amplifier LM4 is as the output of whole battery current sample circuit.
7th resistance R7 is sampling resistor, the precision resistance that sampling performance is good.In order to the input voltage condition making the output voltage of Hall current sensor meet dsp chip AD port, have devised the combinational circuit of inverter and reverse adder.Wherein, inverter is formed by the 3rd operational amplifier LM3 and the 8th resistance R8; Reverse adder is formed by four-operational amplifier LM4 and the tenth resistance R10, the 12 resistance R12.Circuit exports as 0-3V, meets the AD port input voltage condition of DSP.
Be illustrated in figure 4 the battery temperature sample circuit schematic diagram of a kind of battery for electric automobile management system circuit of the present invention.Comprise the 13 resistance R13, the 14 resistance R14, the 15 resistance R15, the 16 resistance R16, the 17 resistance R17, the 18 resistance R18, the 19 resistance R19, the first thermistor PTC1; 5th polar capacitor C5, the 6th polar capacitor C6, the 7th electric capacity C7, the 8th electric capacity C8; 5th operational amplifier LM5, the 6th operational amplifier LM6;
The negative pole of the 5th polar capacitor C5, the negative pole of the 6th polar capacitor C6, one end of the 7th electric capacity C7, one end of the 8th electric capacity C8 are connected with one end of the 13 resistance R13, one end of the first thermistor PTC1 respectively, simultaneously ground connection; The positive pole of the 5th polar capacitor C5, the other end of the 7th electric capacity C7 are connected with the other end of the 13 resistance R13, one end of the 14 resistance R14 respectively, are connected with the inverting input of the 5th operational amplifier LM5 simultaneously; The other end of the 14 resistance R14 is connected with one end of the 15 resistance R15, connects+15V power supply simultaneously; The other end of the 15 resistance R15 is connected with the other end of the first thermistor PTC1, the positive pole of the 6th polar capacitor C6, the other end of the 8th electric capacity C8 respectively, sends into the in-phase input end of the 6th operational amplifier LM6 simultaneously.
The in-phase input end of the 5th operational amplifier LM5 is connected with one end of the 16 resistance R16, one end of the 17 resistance R17 respectively, the other end ground connection of the 17 resistance R17, the other end of the 16 resistance R16 is connected with the output of the 5th operational amplifier LM5, one end of the 18 resistance R18 respectively; The inverting input of the 6th operational amplifier LM6 is connected with the other end of the 18 resistance R18, one end of the 19 resistance R19 respectively, and the other end of the 19 resistance R19 is connected with the output of the 6th operational amplifier LM6; The output of the 6th operational amplifier LM6 is as the output of whole battery temperature sample circuit.
This main circuit will complete the sampling to battery temperature.In figure, the first thermistor PTC1 is thermistor, although its resistance value variation with temperature is nonlinear, this circuit is not high to the linear requirements of thermistor, only need detect the upper and lower bound of battery temperature, therefore the linearity almost has no relations.This circuit uses semistor.In figure, the 5th operational amplifier LM5, the 6th operational amplifier LM6 all adopt LM358 model.
Be illustrated in figure 5 the analog switch hardware circuit principle figure of a kind of battery for electric automobile management system circuit of the present invention.Comprise 24 road battery BAT1-BAT24; 24 diodes (the second diode D2-the 25 diode D25); First analog switch CD1, the second analog switch CD2; First inverter NOT1; 20 resistance R20.
The positive pole of every road battery of 24 road batteries is connected with the anode of a diode, and the negative electrode of diode is connected with the BAT+ input of battery voltage sampling circuit; The negative pole of every road battery of 24 road batteries is connected with the BAT-input of battery voltage sampling circuit; Every road battery is numbered AS1-AS24 through the output of battery voltage sampling circuit is identical with battery.
One end of 20 resistance R20 is connected with the pin 1 of pin 1, the second analog switch CD2 of the first analog switch CD1 respectively, and the other end is as output; The pin 24 of pin 24, the second analog switch CD2 of the first analog switch CD1 connects+15V power supply simultaneously.
Pin 12 ground connection simultaneously of pin 12, the second analog switch CD2 of the first analog switch CD1; The pin 10 of pin 10, the second analog switch CD2 of the first analog switch CD1 is simultaneously as a-signal input; The pin 11 of pin 11, the second analog switch CD2 of the first analog switch CD1 is simultaneously as B signal input part; The pin 14 of pin 14, the second analog switch CD2 of the first analog switch CD1 is simultaneously as C signal input part; The pin 13 of pin 13, the second analog switch CD2 of the first analog switch CD1 is simultaneously as D signal input part; The pin 15 of the second analog switch CD2 is connected with the pin 15 of the first analog switch CD1 by the first inverter NOT1; The pin of the second analog switch CD2 according to pin 9-pin 2, then is AS1-AS16 from the serial number of pin 23-pin 16; The pin of the first analog switch (CD1) is AS17-AS24 according to the serial number of pin 9-pin 2.
The Main Function of this circuit solves the limited problem of the A/D port of DSP.If directly measured by DSP Dui 24 road battery terminal voltage, be first that the port of DSP is limited, be secondly realize also comparatively difficulty, measure error is large.Dsp chip control signal A, B, C, D, from 0000 to 1111 changes, can have 16 kinds of changes, thus reach the control to 16 tunnels.By can select different CD4067 work to the control of CD4067 pin 15.Battery has 24 tunnels, therefore needs 2 CD4067.Because DSP operating frequency is very high, can select two panels CD4067 in the short time, and select different pins, complete the circling measurment to cell voltage.Shi Yi 24 road of the present invention battery is example, when battery way is more or less when practical application, can adjust the sheet number of CD4067 and the port number of DSP control, and suitable Circuit tuning connects according to concrete data.
Be illustrated in figure 6 the ambient temperature sample circuit schematic diagram of a kind of battery for electric automobile management system circuit of the present invention.Comprise the 9th electric capacity C9, the tenth electric capacity C10; 21 resistance R21, the 22 resistance R22, the 23 swept resistance R23, the 24 resistance R24, the 25 resistance R25, the 26 resistance R26; First integrated temperature sensor U1; One NPN triode Q1, the 2nd NPN triode Q2.
The pin 1 of the first integrated temperature sensor U1 is connected with one end of the 9th electric capacity C9, connects+15V power supply simultaneously, the other end ground connection of the 9th electric capacity C9; The pin 2 of the first integrated temperature sensor U1 is connected with one end of the tenth electric capacity C10, the inverting input of the 7th operational amplifier LM7 respectively, and the other end of the tenth electric capacity C10 is connected with one end of the 22 resistance R22, connects+15V power supply simultaneously; Pin 3 ground connection of the first integrated temperature sensor U1; The pin 4 of the first integrated temperature sensor U1 is connected with one end of the 21 resistance R21, the other end ground connection of the 21 resistance R21.
One end of 22 resistance R22 is connected with one end of the 9th electric capacity C9, connects+15V power supply simultaneously, and the other end is connected with one end of the 23 swept resistance R23; The other end of the 23 swept resistance R23 is connected with one end of the 24 resistance R24, the other end ground connection of the 24 resistance R24; The centre cap of the 23 swept resistance R23 is connected with the in-phase input end of the 7th operational amplifier LM7.
The in-phase input end of the 7th operational amplifier LM7 is connected with the centre cap of the 23 swept resistance R23, and inverting input is connected with the pin 2 of the first integrated temperature sensor U1, and output is connected with the base stage of a NPN triode Q1.
One termination+15V the power supply of the 25 resistance R25, the other end is connected with the collector electrode of a NPN triode Q1, the collector electrode of the 2nd NPN triode Q2 respectively; One end of 26 resistance R26 is connected with the emitter of a NPN triode Q1, the base stage of the 2nd NPN triode Q2 respectively, other end ground connection; The grounded emitter of the 2nd NPN triode Q2.
The main purpose of this circuit is measures ambient temperature, provides reference.This circuit adopts integrated temperature sensor, and model is AN6701.Compared with the temperature detection in battery temperature sample circuit, the temperature survey in this circuit needs reference more accurately, needs the extraordinary linearity, and therefore this circuit adopts good integrated temperature sensor.Want the working temperature measuring range and the sensitivity that change this measuring circuit, only need change the size of the 21 resistance R21.
Be illustrated in figure 7 second-order filter and the sampling hold circuit schematic diagram of a kind of battery for electric automobile management system circuit of the present invention.This circuit will realize two functions: filtering and sampling keep.What second-order filter circuit will solve is the accuracy collecting single battery voltage and current; The simultaneity of what sampling hold circuit will solve is voltage and current.Comprise the 27 resistance R27, the 28 resistance R28, the 29 resistance R29; 11 electric capacity C11, the 12 electric capacity C12, the 13 electric capacity C13; 8th operational amplifier LM8; First sampling holder SH1.
One end of 27 resistance R27 and the output of battery voltage sampling circuit, or be connected with the output of battery current sample circuit, the other end is connected with one end of the 11 electric capacity C11, one end of the 28 resistance R28 respectively; The other end of the 11 electric capacity C11 is connected with the output of the 8th operational amplifier LM8, the pin 3 of the first sampling holder SH1 respectively; The other end of the 28 resistance R28 is connected with one end of the 12 electric capacity C12, one end of the 29 resistance R29 respectively, the other end ground connection of the 12 electric capacity (C12), the other end of the 29 resistance R29 is connected with the in-phase input end of the 8th operational amplifier LM8.
The inverting input of the 8th operational amplifier LM8 is connected with the output of the 8th operational amplifier LM8.
The pin 1 of the first sampling holder SH1 connects+15V power supply, and pin 4 connects-15V power supply, and pin 6 is connected with one end of the 13 electric capacity C13; The other end of the 13 electric capacity C13 is connected with the pin 7 of the first sampling holder SH1, simultaneously ground connection; The pin 8 of the first sampling holder SH1 is connected with the IOPB3 of DSP, and pin 5 is as the output of whole second-order filter and sample circuit.
This circuit adopts RC second-order filter circuit, forms LM8 by the 27 resistance R27, the 28 resistance R28, the 29 resistance R29, the 11 electric capacity C11, the 12 electric capacity C12, the 8th operational amplifier.This RC second-order filter circuit transition band is narrower, and filter effect is obvious.8th operational amplifier LM8 adopts TL028A model.This circuit is applicable to the sampling to cell voltage and the sampling to battery current simultaneously, and the LIN end of the two all receives the IOPB3 interface of DSP.
Sampling hold circuit is the important component part of analog input channel, and Main Function ensures that the cell voltage that collects and current data are synchronizations, thus ensures the accuracy of the SOC estimation of battery.This circuit adopts integrated sampling holder.
Be illustrated in figure 8 the DSPA/D protective circuit schematic diagram of a kind of battery for electric automobile management system circuit of the present invention.Comprise the 30 resistance R30; 14 electric capacity C14; 26 diode D26; First voltage-stabiliser tube DZ1.
One end of described 30 resistance R30 is as signal input part, and the other end is connected with one end of the 14 electric capacity C14, the anode of the 26 diode D26, the negative electrode of the first voltage-stabiliser tube DZ1, the input of DSP respectively; The other end ground connection of the 14 electric capacity C14, the negative electrode D26 of the 26 diode connects+3.3V power supply, the first voltage-stabiliser tube (DZ1) plus earth.
The effect of this circuit is the safety ensureing DSP.When input voltage is too high, the 26 diode current flow, thus make input voltage clamper at+3.3V, ensure that input voltage is no more than the normal working voltage scope of dsp chip; When input voltage lower than zero time, the first voltage-stabiliser tube DZ1 conducting, makes input clamper at 0V, still within the scope of the normal working voltage of dsp chip.
Be illustrated in figure 9 the CAN communication circuit schematic diagram of a kind of battery for electric automobile management system circuit of the present invention.Comprise the second CAN transceiving chip U2; 31 resistance R31, the 32 resistance R32, the 33 resistance R33; 15 electric capacity C15, the 16 electric capacity C16; 27 diode D27, the 28 diode D28; First CAN interface CAN1.
Second CAN transceiving chip U2 pin 1 connects CANTX signal, pin 2 ground connection, and pin 3 connects+15V power supply, and pin 4 connects CANRX signal, and pin 6 is connected with one end of the 32 resistance R32, and pin 7 is connected with one end of the 31 resistance R31, pin 8 ground connection.
The other end of the 31 resistance R31 is connected with one end of the 15 electric capacity C15, the negative electrode of the 27 diode D27, one end of the 33 resistance R33 respectively; The other end of the 32 resistance R32 is connected with one end of the 16 electric capacity C16, the negative electrode of the 28 diode D28, the other end of the 33 resistance R33 respectively; The anode of the other end of the 15 electric capacity C15, the other end of the 16 electric capacity C16, the 27 diode D27, the anode of the 28 diode D28 ground connection simultaneously; One end of 33 resistance R33 is connected with the pin 7 of the first CAN interface CAN1, and the other end is connected with the pin 2 of the first CAN interface CAN1.
The pin 5 of the first CAN interface CAN1 is connected with pin 1, pin 6 respectively, and pin 9 is connected with pin 8, pin 6 respectively, and pin 4 is connected with pin 5, pin 3, pin 6 respectively, and pin 8 is connected with pin 9, pin 6 respectively.
The all various information collected of battery management system, need to be sent to host computer, accept monitoring and the instruction of host computer simultaneously, and this circuit adopts the communication interface circuit based on CAN.Concrete work has then been come by Software for Design, does not repeat here.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (1)
1. a battery for electric automobile management circuit, it is characterized in that, comprise battery voltage sampling circuit, battery current sample circuit, battery temperature sample circuit, analog multichannel switch hardware circuit, ambient temperature sample circuit, second-order filter and sampling hold circuit, DSPA/D protective circuit, CAN communication circuit;
Described battery voltage sampling circuit, comprises the first swept resistance (R1), the second swept resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6); First electric capacity (C1), the second electric capacity (C2), the 3rd electric capacity (C3), the 4th electric capacity (C4); First operational amplifier (LM1), the second operational amplifier (LM2); First diode (D1);
One end ground connection of described first electric capacity (C1), the other end is connected with the negative pole of batteries, one end of the first swept resistance (R1) respectively; One end ground connection of described second electric capacity (C2), the other end is connected with the positive pole of batteries, one end of the second swept resistance (R2) respectively; The tap terminals of described first swept resistance (R1) is connected with one end of the 4th resistance (R4), the other end of the first swept resistance (R1), the inverting input of the first operational amplifier (LM1) respectively; The tap terminals of described second swept resistance (R2) is connected with one end of the 3rd resistance (R3), the other end of the second swept resistance (R2), the in-phase input end of the first operational amplifier (LM1) respectively, the other end ground connection of the 3rd resistance (R3); The other end of described 3rd resistance (R4) is connected with the output of the first operational amplifier (LM1), one end of the 5th resistance (R5) respectively; The other end of described 5th resistance (R5) is connected with one end of the 3rd electric capacity (C3), the in-phase input end of the second operational amplifier (LM2) respectively; The in-phase input end of described second operational amplifier (LM2) is connected with the other end of the 5th resistance (R5), one end of the 3rd electric capacity (C3) respectively, and inverting input is connected with one end of the 6th resistance (R6), the output of the second operational amplifier (LM2) respectively; The other end of described 6th resistance (R6) is connected with one end of the 4th electric capacity (C4), the negative electrode of the first diode (D1) respectively, and as the output of whole battery voltage sampling circuit; The other end of described 4th electric capacity (C4) is connected with the anode of the first diode (D1) and ground connection;
Described battery current sample circuit, comprises the first Hall current sensor (H1); 7th resistance (R7), the 8th resistance (R8), the 9th resistance (R9), the tenth resistance (R10), the 11 resistance (R11), the 12 resistance (R12); 3rd operational amplifier (LM3), four-operational amplifier (LM4); The pin 5 of described first Hall current sensor (H1) connects the positive pole of batteries, pin 4 connects the negative pole of batteries, pin 1 connects+15V power supply, pin 2 connects-15V power supply, and pin 3 is connected with one end of the 7th resistance (R7), one end of the 8th resistance (R8) respectively; The other end ground connection of described 7th resistance (R7), the other end of the 8th resistance (R8) is connected with the inverting input of the 3rd operational amplifier (LM3); The in-phase input end ground connection of described 3rd operational amplifier (LM3), inverting input is connected with the other end of described 8th resistance (R8), output is connected with one end of the 9th resistance (R9), one end of the tenth resistance (R10) respectively, and the other end of the 9th resistance (R9) connects+15V power supply by the 11 resistance (R11); The other end of described tenth resistance (R10) is connected with one end of the 12 resistance (R12), the inverting input of four-operational amplifier (LM4) respectively; The in-phase input end ground connection of described four-operational amplifier (LM4), inverting input is connected with the other end of the tenth resistance (R10), one end of the 12 resistance (R12) respectively; The other end of described 12 resistance (R12) is connected with the output of four-operational amplifier (LM4); The output of described four-operational amplifier (LM4) is as the output of whole battery current sample circuit;
Described battery temperature sample circuit, comprises the 13 resistance (R13), the 14 resistance (R14), the 15 resistance (R15), the 16 resistance (R16), the 17 resistance (R17), the 18 resistance (R18), the 19 resistance (R19), the first thermistor (PTC1); 5th polar capacitor (C5), the 6th polar capacitor (C6), the 7th electric capacity (C7), the 8th electric capacity (C8); 5th operational amplifier (LM5), the 6th operational amplifier (LM6); The negative pole of described 5th polar capacitor (C5), the negative pole of the 6th polar capacitor (C6), one end of the 7th electric capacity (C7), one end of the 8th electric capacity (C8) are connected with one end of the 13 resistance (R13), one end of the first thermistor (PTC1) respectively, simultaneously ground connection; The positive pole of described 5th polar capacitor (C5), the other end of the 7th electric capacity (C7) are connected with the other end of the 13 resistance (R13), one end of the 14 resistance (R14) respectively, are connected with the inverting input of the 5th operational amplifier (LM5) simultaneously; The other end of described 14 resistance (R14) is connected with one end of the 15 resistance (R15), connects+15V power supply simultaneously; The other end of described 15 resistance (R15) is connected with the other end of the first thermistor (PTC1), the positive pole of the 6th polar capacitor (C6), the other end of the 8th electric capacity (C8) respectively, sends into the in-phase input end of the 6th operational amplifier (LM6) simultaneously; The in-phase input end of described 5th operational amplifier (LM5) is connected with one end of the 16 resistance (R16), one end of the 17 resistance (R17) respectively, the other end ground connection of the 17 resistance (R17), the other end of the 16 resistance (R16) is connected with the output of the 5th operational amplifier (LM5), one end of the 18 resistance (R18) respectively; The inverting input of described 6th operational amplifier (LM6) is connected with the other end of the 18 resistance (R18), one end of the 19 resistance (R19) respectively, and the other end of the 19 resistance (R19) is connected with the output of the 6th operational amplifier (LM6); The output of described 6th operational amplifier (LM6) is as the output of whole battery temperature sample circuit;
Described analog multichannel switch hardware circuit, comprises 24 road batteries (BAT1-BAT24); 24 diodes (the second diode (D2)-the 25 diode (D25)); First analog switch (CD1), the second analog switch (CD2); First inverter (NOT1); 20 resistance (R20); The positive pole of every road battery of described 24 road batteries is connected with the anode of a diode, and the negative electrode of diode is connected with the BAT+ input of battery voltage sampling circuit according to claim 2; The negative pole of every road battery of described 24 road batteries is connected with the BAT-input of battery voltage sampling circuit according to claim 2; Every road battery is numbered AS1-AS24 through the output of battery voltage sampling circuit according to claim 2 is identical with battery;
One end of described 20 resistance (R20) is connected with the pin 1 of the pin 1, second analog switch (CD2) of the first analog switch (CD1) respectively, and the other end is as output; The pin 24 of the pin 24, second analog switch (CD2) of described first analog switch (CD1) connects+15V power supply simultaneously;
Pin 12 ground connection simultaneously of the pin 12, second analog switch (CD2) of described first analog switch (CD1); The pin 10 of the pin 10, second analog switch (CD2) of described first analog switch (CD1) is simultaneously as a-signal input; The pin 11 of the pin 11, second analog switch (CD2) of described first analog switch (CD1) is simultaneously as B signal input part; The pin 14 of the pin 14, second analog switch (CD2) of described first analog switch (CD1) is simultaneously as C signal input part; The pin 13 of the pin 13, second analog switch (CD2) of described first analog switch (CD1) is simultaneously as D signal input part; The pin 15 of described second analog switch (CD2) is connected with the pin 15 of the first analog switch (CD1) by the first inverter (NOT1); The pin of described second analog switch (CD2) according to pin 9-pin 2, then is AS1-AS16 from the serial number of pin 23-pin 16; The pin of described first analog switch (CD1) is AS17-AS24 according to the serial number of pin 9-pin 2;
Described ambient temperature sample circuit, comprises the 9th electric capacity (C9), the tenth electric capacity (C10); 21 resistance (R21), the 22 resistance (R22), the 23 swept resistance (R23), the 24 resistance (R24), the 25 resistance (R25), the 26 resistance (R26); First integrated temperature sensor (U1); One NPN triode (Q1), the 2nd NPN triode (Q2); The pin 1 of described first integrated temperature sensor (U1) is connected with one end of the 9th electric capacity (C9), connects+15V power supply simultaneously, the other end ground connection of the 9th electric capacity (C9); The pin 2 of described first integrated temperature sensor (U1) is connected with one end of the tenth electric capacity (C10), the inverting input of the 7th operational amplifier (LM7) respectively, the other end of the tenth electric capacity (C10) is connected with one end of the 22 resistance (R22), connects+15V power supply simultaneously; Pin 3 ground connection of described first integrated temperature sensor (U1); The pin 4 of described first integrated temperature sensor (U1) is connected with one end of the 21 resistance (R21), the other end ground connection of the 21 resistance (R21); One end of described 22 resistance (R22) is connected with one end of the 9th electric capacity (C9), connects+15V power supply simultaneously, and the other end is connected with one end of the 23 swept resistance (R23); The other end of described 23 swept resistance (R23) is connected with one end of the 24 resistance (R24), the other end ground connection of the 24 resistance (R24); The centre cap of described 23 swept resistance (R23) is connected with the in-phase input end of the 7th operational amplifier (LM7); The in-phase input end of described 7th operational amplifier (LM7) is connected with the centre cap of the 23 swept resistance (R23), inverting input is connected with the pin 2 of the first integrated temperature sensor (U1), and output is connected with the base stage of a NPN triode (Q1); One termination+15V power supply of described 25 resistance (R25), the other end is connected with the collector electrode of a NPN triode (Q1), the collector electrode of the 2nd NPN triode (Q2) respectively; One end of described 26 resistance (R26) is connected with the emitter of a NPN triode (Q1), the base stage of the 2nd NPN triode (Q2) respectively, other end ground connection; The grounded emitter of described 2nd NPN triode (Q2);
Described second-order filter and sampling hold circuit, is characterized in that, comprises the 27 resistance (R27), the 28 resistance (R28), the 29 resistance (R29); 11 electric capacity (C11), the 12 electric capacity (C12), the 13 electric capacity (C13); 8th operational amplifier (LM8); First sampling holder (SH1); Described one end of 27 resistance (R27) and the output of battery voltage sampling circuit according to claim 2, or be connected with the output of battery current sample circuit according to claim 3, the other end is connected with one end of the 11 electric capacity (C11), one end of the 28 resistance (R28) respectively; The other end of described 11 electric capacity (C11) is connected with the output of the 8th operational amplifier (LM8), the pin 3 of the first sampling holder (SH1) respectively; The other end of described 28 resistance (R28) is connected with one end of the 12 electric capacity (C12), one end of the 29 resistance (R29) respectively, the other end ground connection of the 12 electric capacity (C12), the other end of the 29 resistance (R29) is connected with the in-phase input end of the 8th operational amplifier (LM8);
The inverting input of described 8th operational amplifier (LM8) is connected with the output of the 8th operational amplifier (LM8); The pin 1 of described first sampling holder (SH1) connects+15V power supply, and pin 4 connects-15V power supply, and pin 6 is connected with one end of the 13 electric capacity (C13); The other end of described 13 electric capacity (C13) is connected with the pin 7 of the first sampling holder (SH1), simultaneously ground connection; The pin 8 of described first sampling holder (SH1) is connected with the IOPB3 of DSP, and pin 5 is as the output of whole second-order filter and sample circuit; .
Described DSPA/D protective circuit, is characterized in that, comprises the 30 resistance (R30); 14 electric capacity (C14); 26 diode (D26); First voltage-stabiliser tube (DZ1); One end of described 30 resistance (R30) is as signal input part, and the other end is connected with one end of the 14 electric capacity (C14), the anode of the 26 diode (D26), the negative electrode of the first voltage-stabiliser tube (DZ1), the input of DSP respectively; The other end ground connection of described 14 electric capacity (C14), the negative electrode (D26) of the 26 diode connects+3.3V power supply, the first voltage-stabiliser tube (DZ1) plus earth;
Described CAN communication circuit, is characterized in that, comprises the second CAN transceiving chip (U2); 31 resistance (R31), the 32 resistance (R32), the 33 resistance (R33); 15 electric capacity (C15), the 16 electric capacity (C16); 27 diode (D27), the 28 diode (D28); First CAN interface (CAN1); Described second CAN transceiving chip (U2) pin 1 connects CANTX signal, pin 2 ground connection, pin 3 connects+15V power supply, pin 4 connects CANRX signal, pin 6 is connected with one end of the 32 resistance (R32), pin 7 is connected with one end of the 31 resistance (R31), pin 8 ground connection; The other end of described 31 resistance (R31) is connected with one end of the 15 electric capacity (C15), the negative electrode of the 27 diode (D27), one end of the 33 resistance (R33) respectively; The other end of described 32 resistance (R32) is connected with one end of the 16 electric capacity (C16), the negative electrode of the 28 diode (D28), the other end of the 33 resistance (R33) respectively; The anode of the other end of described 15 electric capacity (C15), the other end of the 16 electric capacity (C16), the 27 diode (D27), the anode of the 28 diode (D28) ground connection simultaneously; One end of described 33 resistance (R33) is connected with the pin 7 of the first CAN interface (CAN1), and the other end is connected with the pin 2 of the first CAN interface (CAN1); The pin 5 of described first CAN interface (CAN1) is connected with pin 1, pin 6 respectively, and pin 9 is connected with pin 8, pin 6 respectively, and pin 4 is connected with pin 5, pin 3, pin 6 respectively, and pin 8 is connected with pin 9, pin 6 respectively;
Described second-order filter and sample circuit have two in the entire system, one of them is connected with the output of described analog multichannel switch hardware circuit, another is connected with the output of described battery current sample circuit, and the LIN end of two circuit is all received on the IOPB3 of DSP;
Whole system circuit needs the DSPA/D protective circuit described in four, respectively at the second-order filter described in two and between sample circuit and DSPA/D interface, between described battery temperature sample circuit and DSPA/D interface, between described ambient temperature sample circuit and DSPA/D interface;
Whole system also has a safety switch, an erasable and programable memory EEPROM.
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Application publication date: 20151111 |