CN103698691A - Automatic detection calibration device and automatic detection calibration method of electric car bridge board - Google Patents
Automatic detection calibration device and automatic detection calibration method of electric car bridge board Download PDFInfo
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Abstract
The invention discloses an automatic detection calibration device and an automatic detection calibration method of an electric car bridge board. The automatic detection calibration device of the electric car bridge board comprises a power supply circuit, a first single chip microprocessor, a first CAN (controller area network) communication circuit, a plurality of voltage benchmark sources and a multichannel changeover switch, the power supply circuit is used for powering the first single chip microprocessor and the bridge board, the first CAN communication circuit is connected with the first single chip microprocessor, the voltage benchmark sources are used for supplying a plurality of different current benchmark sampling signals, a plurality of channels of the multichannel changeover switch are respectively connected with the voltage benchmark sources, and the signal input end of the multichannel changeover switch is connected with a changeover control port of the first single chip microprocessor. By adopting the automatic detection calibration device and the automatic detection calibration method of the electric car bridge board, the current sampling of the bridge board can be automatically detected and calibrated, so that the detection efficiency and the detection precision can be improved, the consistency is guaranteed, and the requirement of the industrialized application can be met.
Description
Technical field
The present invention relates to electric automobile field, particularly relate to the automatic testing calibration device and method of a kind of electric automobile bridge plate.
Background technology
Bridge plate is for a circuit board of communication in electric automobile, be responsible for battery management system (BMS), charging system and display system to couple together, with information switching signals such as battery case monomer voltage, electric current, electric weight and battery case total voltage that the BMS module of installing on battery case is detected, electric current, electric weight, pass to display screen, charging set.After bridge plate has been produced, whether the performance index that need to detect various piece reach designing requirement.The detection of existing bridge plate and calibration steps adopt manual type, and workman detects and calibrates the property indices of bridge plate, inefficiency not only, and degree of accuracy is low, and consistance is poor, has been not suitable with the requirement of suitability for industrialized production.
Summary of the invention
For above-mentioned prior art present situation, technical matters to be solved by this invention is, a kind of automatic testing calibration method of electric automobile bridge plate and device are provided, and it can carry out automatic testing calibration to bridge plate current sample, to improve testing calibration efficiency and precision, guarantee consistance.
In order to solve the problems of the technologies described above, the automatic testing calibration device of a kind of electric automobile bridge plate provided by the present invention, comprise power circuit, the first single-chip microcomputer, the one CAN communicating circuit, a plurality of voltage-references and hyperchannel change-over switch, described power circuit provides power supply for described the first single-chip microcomputer and described bridge plate, a described CAN communicating circuit is connected with described the first single-chip microcomputer, described a plurality of voltage-reference is for providing a plurality of different current reference sampled signals, a plurality of passages of described hyperchannel change-over switch are connected with a plurality of described voltage-references respectively, the signal input part of described hyperchannel change-over switch is connected with the switching controls port of described the first single-chip microcomputer.
In an embodiment, described automatic testing calibration device also comprises display device therein, and this display device is connected with described the first single-chip microcomputer.
In an embodiment, described automatic testing calibration device also comprises warning device therein, and this warning device is connected with the output terminal of described the first single-chip microcomputer.
In an embodiment, the quantity of described voltage-reference is n, and 3≤n≤6 therein.
Therein in an embodiment, described automatic testing calibration device also comprises power consumption detection circuit, it comprises sampling resistor and first signal modulate circuit, described sampling resistor is connected on described power circuit, the voltage input end of described first signal modulate circuit is connected to described sampling resistor two ends, and the signal output part of described first signal modulate circuit is connected with described the first single-chip microcomputer.
Therein in an embodiment, described automatic testing calibration device also comprises temperature sampling calibration circuit, it comprises temperature sensors of high precision and secondary signal modulate circuit, the signal input part of described secondary signal modulate circuit connects the output terminal of described temperature sensors of high precision, and the signal output part of described secondary signal modulate circuit is connected with described the first single-chip microcomputer.
Therein in an embodiment, described automatic testing calibration device also comprises dry contact testing circuit, it comprises power supply VCC, divider resistance, the 3rd signal conditioning circuit and pilot lamp, described divider resistance, described bridge plate dry contact port and described pilot lamp are connected on described power supply VCC and with reference between ground, the signal input part of described the 3rd signal conditioning circuit is connected between described divider resistance and described bridge plate dry contact port, and the signal output part of described the 3rd signal conditioning circuit is connected with described the first single-chip microcomputer.
A kind of method of using above-mentioned automatic testing calibration device testing calibration bridge plate provided by the present invention, described bridge plate comprises second singlechip, described power circuit is connected with the power input of described bridge plate, a described CAN communicating circuit is connected with the 2nd CAN communicating circuit of described bridge plate, the common port of described change-over switch is connected with described bridge plate current sample interface, said method comprising the steps of:
S1, described the first single-chip microcomputer be a plurality of passages of hyperchannel change-over switch described in conducting successively, and the different current reference sampled signal current sample interface to described bridge plate is provided;
The current sampling signal modulate circuit of S2, described bridge plate is by after described current reference sampled signal conditioning, through ADC analog to digital conversion circuit, send into described second singlechip and calculate corresponding testing current value, and be transferred to described the first single-chip microcomputer by described the 2nd CAN communicating circuit and a described CAN communicating circuit;
S3, described the first single-chip microcomputer carry out linear fit by testing current value described in each with the real current value of corresponding described voltage-reference, and calculate correction coefficient, and described correction coefficient is delivered to described second singlechip by a described CAN communicating circuit and described the 2nd CAN communicating circuit;
S4, described second singlechip utilize described correction coefficient to calibrate current sample.
Therein in an embodiment, described method also comprises the following steps that are arranged at after described step S4:
S5, described the first single-chip microcomputer switch certain road current reference sampled signal at random to the current sample interface of described bridge plate, testing current value after described second singlechip is calibrated after utilizing described correction coefficient to described current reference sampled signal calibration, and be transferred to described the first single-chip microcomputer by a CAN communicating circuit and described the 2nd CAN communicating circuit;
S6, described the first single-chip microcomputer compare the testing current value after calibration and the real current value of described current reference sampled signal, and judge that comparative result whether within the scope of specification error, if so, calibrated, if not, and output alarm signal.
In an embodiment, described method also comprises bridge plate SOC detecting step therein, and it comprises the following steps:
After described bridge plate current sample has been calibrated, described the first single-chip microcomputer is according to the time of setting and hyperchannel change-over switch described in current curve timing controlled switched conductive, and the extremely current sample interface of described bridge plate of different current reference sampled signal is provided;
Described second singlechip records SOC test value, and is transferred to described the first single-chip microcomputer by described the 2nd CAN communicating circuit and a described CAN communicating circuit;
Described the first single-chip microcomputer compares described SOC test value and SOC actual value, obtains SOC error amount.
By the automatic testing calibration device and method of electric automobile bridge plate provided by the present invention, can realize bridge plate current sample and automatically detect and calibration, thereby improve detection efficiency and precision, guaranteed consistance, met the requirement of industrial applications.
Other beneficial effect that the present invention has will partly describe in this instructions embodiment.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the automatic testing calibration device of electric automobile bridge plate in one of them embodiment of the present invention.
Above in each figure, 100, testing calibration device automatically; 101, the first single-chip microcomputer; 102, first signal modulate circuit; 103, the 3rd signal conditioning circuit; 104, a CAN communicating circuit; 105, secondary signal modulate circuit; 106, first amplifies Drive and Control Circuit; 107, hyperchannel change-over switch; 108, RS485 communicating circuit; 109, a PWR circuit; 110, the 2nd PWR circuit; 111, second amplifies Drive and Control Circuit; 112, hummer; 113, the first voltage-reference; 114, second voltage reference source; 115, tertiary voltage reference source; 116, the 4th voltage-reference; 117, the 5th voltage-reference; 118, divider resistance; 119, pilot lamp; 120, temperature sensors of high precision; 121, DC/AC module; 122, LCD display; 123, power supply VCC; 124, sampling resistor; 200, bridge plate; 201, second singlechip; 202, current sampling signal modulate circuit; 203, the 2nd CAN communicating circuit; 204, temperature sampling signal conditioning circuit; 205, dry contact; 206, the 3rd PWR circuit; 207, bridge plate temperature sensor.
Embodiment
Below with reference to accompanying drawing, also the present invention is described in detail in conjunction with the embodiments.It should be noted that, in the situation that not conflicting, the feature in following embodiment and embodiment can combine mutually.
The schematic diagram of the automatic testing calibration device of electric automobile bridge plate in one of them embodiment of the present invention as shown in Figure 1, automatically testing calibration device 100 comprises power circuit, the first single-chip microcomputer 101, a CAN communicating circuit 104, a plurality of voltage-reference and hyperchannel change-over switch 107, wherein, described power circuit provides power supply for the first single-chip microcomputer 101 and bridge plate 200, and this power circuit comprises DC/AC module 121.The power input of the first single-chip microcomputer 101 is connected with power circuit by a PWR circuit 109.
A described CAN communicating circuit 104 is connected with described the first single-chip microcomputer 101, a described CAN communicating circuit 104 is connected with the 2nd CAN communicating circuit 203 of bridge plate 200, the first single-chip microcomputer 101 is the information from the 2nd CAN communicating circuit 203 of described bridge plate 200 by CAN communicating circuit 104 send and receives, thereby realize data communication.
Described a plurality of voltage-reference is for providing different current reference sampled signals, and more preferably, the quantity of described voltage-reference is n, and 3≤n≤6.The quantity of the voltage-reference in the present embodiment is 5, be respectively the first voltage-reference 113, second voltage reference source 114, tertiary voltage reference source 115, the 4th voltage-reference 116 and the 5th voltage-reference 117, the voltage of the first voltage-reference 113 is 5V, and corresponding current is 500A; The voltage of second voltage reference source 114 is 2.5V, corresponding current 250A; The voltage of tertiary voltage reference source 115 is 0V, and corresponding current is 0A; The voltage of the 4th voltage-reference 116 is-2.5V that corresponding current is-250A; The voltage of the 5th voltage-reference 117 is-5V that corresponding current is-500A.
A plurality of passages of described hyperchannel change-over switch 107 are connected with a plurality of described voltage-references respectively, and the signal input part of described hyperchannel change-over switch 107 is connected with the switching controls port of described single-chip microcomputer by the first amplification Drive and Control Circuit 106.Described hyperchannel change-over switch 107 is for being optionally connected with the current sampling signal modulate circuit 202 of described bridge plate 200 one of a plurality of described voltage-references, thereby provide different current reference sampled signals, preferably, the error < 2mV of current reference sampled signal.The passage of the hyperchannel change-over switch 107 in the present embodiment is 5.
More preferably, described automatic testing calibration device 100 also comprises display device, the signal input part of this display device is connected with described the first single-chip microcomputer 101 by RS485 communicating circuit 108, and the power input of this display device is connected with described power circuit through the 2nd PWR circuit 110.Display device is preferably LCD display 122.
More preferably, described automatic testing calibration device 100 also comprises warning device, and this warning device is connected with the output terminal of described the first single-chip microcomputer 101 by the second amplification Drive and Control Circuit 111.Warning device is preferably hummer 112.
While using the automatic testing calibration device 100 testing calibration bridge plate 200 in above-described embodiment, first the bridge plate 200 having welded is downloaded to a mouthful download test procedure by program, to can communicate alternately with automatic testing calibration device 100, then described power circuit is connected with the 3rd PWR circuit 206 of described bridge plate 200, a described CAN communicating circuit 104 is connected with the 2nd CAN communicating circuit 203 of described bridge plate 200, the common port of described change-over switch is connected with described bridge plate 200 current sampling signal modulate circuits 202.Power on then to automatic testing calibration device 100, click and start testing button, start testing calibration process.Concrete testing calibration method is as follows:
Step S1, described the first single-chip microcomputer 101 be a plurality of passages of hyperchannel change-over switch 107 described in conducting successively, and the different current reference sampled signal current sample interface to described bridge plate 200 is provided;
The current sampling signal modulate circuit 202 of step S2, described bridge plate 200 is by after described current reference sampled signal conditioning, through ADC analog to digital conversion circuit, send into second singlechip 201 and calculate corresponding testing current value, and be transferred to described the first single-chip microcomputer 101 by a CAN communicating circuit 104 and described the 2nd CAN communicating circuit 203;
Step S3, described the first single-chip microcomputer 101 carry out linear fit by testing current value described in each with the real current value of corresponding described voltage-reference, and calculate correction coefficient, described correction coefficient is delivered to described second singlechip 201 by a described CAN communicating circuit 104 and described the 2nd CAN communicating circuit 203;
Step S4, described second singlechip 201 utilize described correction coefficient to calibrate current sample.
More preferably, in order to calibrate more exactly bridge plate 200 current samples, also comprise the following steps that are arranged at after described step S4:
S5, random certain the road current reference sampled signal of switching of described the first single-chip microcomputer 101 are to the current sample interface of described bridge plate 200, testing current value after described second singlechip 201 is calibrated after utilizing described correction coefficient to described current reference sampled signal calibration, and be transferred to described the first single-chip microcomputer 101 by a CAN communicating circuit 104 and described the 2nd CAN communicating circuit 203;
S6, described the first single-chip microcomputer 101 compare the testing current value after calibration and the real current value of described current reference sampled signal, and judge that comparative result is whether within the scope of specification error, if so, calibrated, LCD display 122 shows that automatic calibration completes; Otherwise if not, LCD display 122 shows that automatic calibration is abnormal, meanwhile, output alarm signal, reports to the police by hummer 112, reminds staff's automatic calibration fault.
As can be seen here, the automatic testing calibration device 100 of electric automobile bridge plate 200 provided by the present invention and method, can realize bridge plate 200 current samples and automatically detect and calibration, thereby improve detection efficiency and precision, guarantee consistance, met the requirement of industrial applications; And, simple to operate.
Preferably, described method also comprises bridge plate SOC (State Of Charge, dump energy) detecting step, comprises the following steps:
After described bridge plate 200 current samples have been calibrated, described the first single-chip microcomputer 101 is according to the time of setting and hyperchannel change-over switch 107 described in current curve timing controlled switched conductive, and the extremely current sample interface of described bridge plate 200 of different current reference sampled signal is provided;
Described second singlechip 201 records SOC test value, and is transferred to described the first single-chip microcomputer 101 by described the 2nd CAN communicating circuit 203 and a described CAN communicating circuit 104;
Described the first single-chip microcomputer 101 compares described SOC test value and SOC actual value, obtains SOC error amount, transfers to LCD display 122 show through RS485 communicating circuit 108.
As can be seen here, the automatic testing calibration device 100 of electric automobile bridge plate 200 provided by the present invention and method, can also realize bridge plate SOC and automatically detect, thereby improve detection efficiency and precision, guaranteed consistance, met the requirement of industrial applications.
More preferably, described automatic testing calibration device 100 also comprises power consumption detection circuit, it comprises sampling resistor 124 and first signal modulate circuit 102, described sampling resistor 124 is connected on described power circuit, the voltage input end of described first signal modulate circuit 102 is connected to described sampling resistor 124 two ends, and the signal output part of described first signal modulate circuit 102 is connected with the ADC input end of described the first single-chip microcomputer 101.124 pairs of current samples of sampling resistor convert voltage signal to, via 102 pairs of first signal modulate circuits, voltage signal are nursed one's health to zone of reasonableness, through 12 ADC analog to digital conversion circuits of the first single-chip microcomputer 101, process and send into the first single-chip microcomputer 101.The first single-chip microcomputer 101 internal processes carry out AD sampling and calculate output current value and power consumption number (P=UI) sending into simulating signal, and result of calculation is transferred out to LCD display 122 through RS485 communicating circuit 108.If electric current and power consumption are in the reasonable scope, LCD display 122 shows that bridge plate 200 power consumptions are normal, otherwise shows abnormal; Meanwhile, the first single-chip microcomputer 101 is reported to the police by hummer 112, reminds staff's power consumption fault.
More preferably, described automatic testing calibration device 100 also comprises temperature sampling calibration circuit, it comprises temperature sensors of high precision 120 and secondary signal modulate circuit 105, the signal input part of described secondary signal modulate circuit 105 connects the output terminal of described temperature sensors of high precision 120, and the signal output part of described secondary signal modulate circuit 105 is connected with the ADC input end of described the first single-chip microcomputer 101.Bridge plate 200 is nursed one's health and is sent to second singlechip 201 through temperature sampling signal conditioning circuit 204 by bridge plate temperature sensor 207 collecting temperature data, the temperature information data that second singlechip 201 inside calculate, arrive second singlechip 201 inside by a CAN communicating circuit 104 and the 2nd CAN communicating circuit 203; Temperature sensors of high precision 120 collecting temperature data are nursed one's health and are sent to the first single-chip microcomputer 101 inside and calculate through high-precision temperature sampled signal modulate circuit 204, draw high-precision temperature information data, both compare and calculate error amount, then the first single-chip microcomputer 101 transfers to second singlechip 201 by this error amount by a CAN communicating circuit 104 and the 2nd CAN communicating circuit 203, the temperature data of second singlechip 201 inside carries out automatically more accurate, and calibration information is transferred to LCD display 122 by RS485 communicating circuit 108 shows.
More preferably, described automatic testing calibration device 100 also comprises dry contact 205 testing circuits, it comprises power supply VCC123, divider resistance 118, the 3rd signal conditioning circuit 103 and pilot lamp 119, described divider resistance 118, described bridge plate 200 dry contact 205 ports and described pilot lamp 119 is connected on described power supply VCC123 and with reference between ground, the signal input part of described the 3rd signal conditioning circuit 103 is connected between described divider resistance 118 and described bridge plate 200 dry contact 205 ports, the signal output part of described the 3rd signal conditioning circuit 103 is connected with the I/O port of described the first single-chip microcomputer 101.When bridge plate 200 dry contact 205 ports closure, power supply VCC123 powers and gets back to reference to GND formation loop, ground to LED light 119 through bridge plate 200 dry contact 205 ports, and LED light 119 is luminous, and the I/O of the first single-chip microcomputer 101 detects low level; When bridge plate 200 dry contact 205 ports disconnect, LED light 119 does not work, and the IO of the first single-chip microcomputer 101 detects high level.Automatically testing calibration device 100 sends dry contact 205 switch commands to second singlechip 201 by a CAN communicating circuit 104 and the 2nd CAN communicating circuit 203, in official hour, if the level detecting is consistent with transmission order, by RS485 circuit, at LCD, show that dry contact 205 output functions are normal, otherwise show abnormal, meanwhile, the first single-chip microcomputer 101 is reported to the police by hummer 112, reminds staff's dry contact 205 faults.
In addition, automatic testing calibration device 100 in the present embodiment can also be realized bridge plate CAN communicating circuit and automatically detect, testing process is as follows: the first single-chip microcomputer 101 is the information from the 2nd CAN communicating circuit 203 of bridge plate 200 by CAN communicating circuit 104 send and receives, if after transmission detecting information, in official hour, receive effective return information of bridge plate 200, show that bridge plate CAN communication function is normal, through RS485 communicating circuit 108, transfer to LCD display 122 and show that CAN communication is normal; Otherwise, show CAN communication abnormality, meanwhile, the first single-chip microcomputer 101 is reported to the police by hummer 112, reminds staff CAN communication failure.
To sum up, automatic testing calibration device 100 in the embodiment of the present invention, automatically fast detecting is calibrated the various functions of electric automobile bridge plate: power consumption, CAN communication, current sample, SOC, temperature sampling and dry contact output port, and in time various functions situation is presented to LCD the inside, make bad problem obtain accurately location fast, thereby improved the electric automobile bridge plate debugging step process of complexity in process of production, avoided waste of time, improved production efficiency and quality.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (10)
1. the automatic testing calibration device of electric automobile bridge plate, it is characterized in that, comprise power circuit, the first single-chip microcomputer, the one CAN communicating circuit, a plurality of voltage-references and hyperchannel change-over switch, described power circuit provides power supply for described the first single-chip microcomputer and described bridge plate, a described CAN communicating circuit is connected with described the first single-chip microcomputer, described a plurality of voltage-reference is for providing a plurality of different current reference sampled signals, a plurality of passages of described hyperchannel change-over switch are connected with a plurality of described voltage-references respectively, the signal input part of described hyperchannel change-over switch is connected with the switching controls port of described the first single-chip microcomputer.
2. the automatic testing calibration device of electric automobile bridge plate according to claim 1, is characterized in that, described automatic testing calibration device also comprises display device, and this display device is connected with described the first single-chip microcomputer.
3. the automatic testing calibration device of electric automobile bridge plate according to claim 1, is characterized in that, described automatic testing calibration device also comprises warning device, and this warning device is connected with the output terminal of described the first single-chip microcomputer.
4. the automatic testing calibration device of electric automobile bridge plate according to claim 1, is characterized in that, the quantity of described voltage-reference is n, and 3≤n≤6.
5. according to the automatic testing calibration device of electric automobile bridge plate described in any one in claim 1 to 4, it is characterized in that, described automatic testing calibration device also comprises power consumption detection circuit, it comprises sampling resistor and first signal modulate circuit, described sampling resistor is connected on described power circuit, the voltage input end of described first signal modulate circuit is connected to described sampling resistor two ends, and the signal output part of described first signal modulate circuit is connected with described the first single-chip microcomputer.
6. according to the automatic testing calibration device of electric automobile bridge plate described in any one in claim 1 to 4, it is characterized in that, described automatic testing calibration device also comprises temperature sampling calibration circuit, it comprises temperature sensors of high precision and secondary signal modulate circuit, the signal input part of described secondary signal modulate circuit connects the output terminal of described temperature sensors of high precision, and the signal output part of described secondary signal modulate circuit is connected with described the first single-chip microcomputer.
7. according to the automatic testing calibration device of electric automobile bridge plate described in any one in claim 1 to 4, it is characterized in that, described automatic testing calibration device also comprises dry contact testing circuit, it comprises power supply VCC, divider resistance, the 3rd signal conditioning circuit and pilot lamp, described divider resistance, described bridge plate dry contact port and described pilot lamp are connected on described power supply VCC and with reference between ground, the signal input part of described the 3rd signal conditioning circuit is connected between described divider resistance and described bridge plate dry contact port, the signal output part of described the 3rd signal conditioning circuit is connected with described the first single-chip microcomputer.
8. the use method of testing calibration device testing calibration bridge plate automatically as claimed in any of claims 1 to 7 in one of claims, described bridge plate comprises second singlechip, it is characterized in that, described power circuit is connected with the power input of described bridge plate, a described CAN communicating circuit is connected with the 2nd CAN communicating circuit of described bridge plate, the common port of described change-over switch is connected with described bridge plate current sample interface, said method comprising the steps of:
S1, described the first single-chip microcomputer be a plurality of passages of hyperchannel change-over switch described in conducting successively, and the different current reference sampled signal current sample interface to described bridge plate is provided;
The current sampling signal modulate circuit of S2, described bridge plate is by after described current reference sampled signal conditioning, through ADC analog to digital conversion circuit, send into described second singlechip and calculate corresponding testing current value, and be transferred to described the first single-chip microcomputer by described the 2nd CAN communicating circuit and a described CAN communicating circuit;
S3, described the first single-chip microcomputer carry out linear fit by testing current value described in each with the real current value of corresponding described voltage-reference, and calculate correction coefficient, and described correction coefficient is delivered to described second singlechip by a described CAN communicating circuit and described the 2nd CAN communicating circuit;
S4, described second singlechip utilize described correction coefficient to calibrate current sample.
9. method according to claim 8, is characterized in that, also comprises and is arranged at described step S4 following steps afterwards:
S5, described the first single-chip microcomputer switch certain road current reference sampled signal at random to the current sample interface of described bridge plate, testing current value after described second singlechip is calibrated after utilizing described correction coefficient to described current reference sampled signal calibration, and be transferred to described the first single-chip microcomputer by a CAN communicating circuit and described the 2nd CAN communicating circuit;
S6, described the first single-chip microcomputer compare the testing current value after calibration and the real current value of described current reference sampled signal, and judge that comparative result whether within the scope of specification error, if so, calibrated, if not, and output alarm signal.
10. method according to claim 8, is characterized in that, also comprises bridge plate SOC detecting step, and it comprises the following steps:
After described bridge plate current sample has been calibrated, described the first single-chip microcomputer is according to the time of setting and hyperchannel change-over switch described in current curve timing controlled switched conductive, and the extremely current sample interface of described bridge plate of different current reference sampled signal is provided;
Described second singlechip records SOC test value, and is transferred to described the first single-chip microcomputer by described the 2nd CAN communicating circuit and a described CAN communicating circuit;
Described the first single-chip microcomputer compares described SOC test value and SOC actual value, obtains SOC error amount.
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| CN113342121A (en) * | 2020-11-10 | 2021-09-03 | 明峰医疗系统股份有限公司 | Multi-channel PET power supply automatic calibration circuit and calibration method |
| CN113791562A (en) * | 2021-09-13 | 2021-12-14 | 刘丽丽 | Digital implementation method for sampling high-side IGBT temperature and bus voltage of motor controller |
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