CN110843598B - Temperature acquisition compensation method and circuit and battery management system of electric equipment - Google Patents
Temperature acquisition compensation method and circuit and battery management system of electric equipment Download PDFInfo
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- CN110843598B CN110843598B CN201911129962.6A CN201911129962A CN110843598B CN 110843598 B CN110843598 B CN 110843598B CN 201911129962 A CN201911129962 A CN 201911129962A CN 110843598 B CN110843598 B CN 110843598B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention discloses a temperature acquisition compensation method and circuit and an electric equipment battery management system. Wherein, this compensating circuit includes: temperature acquisition circuitry comprising at least: the temperature acquisition circuit is used for acquiring a divided voltage value of the first voltage dividing circuit so as to calculate the battery temperature of the target battery; the reference voltage construction circuit is used for providing a reference voltage which is the same as the normal power supply voltage of the power supply; the voltage difference value calculation circuit is connected with the reference voltage construction circuit and is used for calculating a voltage difference value between the voltage of the power supply and the reference voltage; and the compensation circuit is respectively connected with the voltage output end of the temperature acquisition circuit and the output end of the voltage difference value calculation circuit and is used for determining that the voltage of the power supply fluctuates when the absolute value of the voltage difference value is larger than a preset value and compensating the voltage of the power supply so as to enable the voltage value input to the control unit to be a normal voltage division value.
Description
Technical Field
The invention relates to the technical field of battery control, in particular to a temperature acquisition compensation method and circuit and an electric equipment battery management system.
Background
In the related art, the temperature acquisition circuit is an important component in a bms (battery Management system) system of the electric vehicle, and when the battery of the electric vehicle is overheated, the temperature acquisition circuit is required to acquire correct temperature information and transmit the temperature information to the control chip for protection measures. Fig. 1 is a schematic diagram of a temperature acquisition circuit in the prior art, wherein R1 is a thermistor, and since the thermistor has a characteristic that a resistance value changes with a temperature change, the temperature acquisition circuit can acquire a change of a voltage division value on a voltage division resistor R2 to reflect a temperature change, thereby implementing a temperature measurement. In fig. 1, VCC is a power supply, and R3, C1, and C2 may filter the divided voltage signal. When the voltage of the power supply fluctuates due to the faults of the PCB layout, the routing or the power supply chip, the voltage input to the control chip fluctuates along with the fluctuation, and the temperature value calculated by the control chip through a program is wrong. This wrong temperature value will most likely cause the control chip to send out a temperature protection signal to shut down some important devices, but in reality the temperature does not change.
The voltage division value of the voltage division resistor on the temperature acquisition circuit is influenced by the resistance value of the thermistor and also influenced by the power supply of the temperature acquisition circuit. When the temperature is not changed and the voltage of the power supply is changed, the voltage output to the control chip is also changed, so that the program mistakenly thinks that the temperature is changed, the misoperation of protective measures is caused, the safe operation of the vehicle is influenced, and the personal and property safety is harmed.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a temperature acquisition compensation method and circuit and an electric equipment battery management system, which at least solve the technical problem that in the related technology, a temperature acquisition circuit is easily influenced by power supply fluctuation to cause temperature acquisition errors.
According to an aspect of an embodiment of the present invention, there is provided a temperature acquisition compensation circuit including: temperature acquisition circuitry comprising at least: the temperature acquisition circuit is used for acquiring a divided voltage value of the first voltage division circuit to calculate the battery temperature of a target battery, and the power supply provides a voltage source for the temperature acquisition circuit; the reference voltage construction circuit is used for providing a reference voltage which is the same as the normal power supply voltage of the power supply; the voltage difference value calculation circuit is connected with the reference voltage construction circuit and is used for calculating a voltage difference value between the voltage of the power supply and the reference voltage; and the compensation circuit is respectively connected with the voltage output end of the temperature acquisition circuit and the output end of the voltage difference value calculation circuit, and is used for determining that the voltage of the power supply fluctuates and compensating the voltage of the power supply when the absolute value of the voltage difference value is greater than a preset value so as to enable the voltage value input to the control unit to be a normal voltage division value.
Optionally, the temperature acquisition circuit is disposed on a control system of the electric device, and the temperature acquisition circuit further includes: a thermosensitive circuit for measuring a battery temperature of the target battery, wherein a divided voltage value of the first voltage dividing circuit changes when a circuit value of the thermosensitive circuit changes with a change in the temperature of the target battery; a filter circuit comprising at least: the second voltage division circuit and the filtering module are used for filtering the acquired voltage division value of the first voltage division circuit; and the voltage output end is used for outputting the voltage division value of the first voltage division circuit after filtering processing.
Optionally, the reference voltage building circuit includes: a first regulated voltage source providing a regulated voltage source for a control system of the electrically powered device; a third voltage dividing circuit and a fourth voltage dividing circuit for dividing the voltage of the first stable voltage source, wherein the reference voltage constructing circuit constructs the reference voltage by dividing the voltage with the first stable voltage source; and the first operational amplifier is used for amplifying and processing the voltage value of the reference voltage.
Optionally, the voltage difference calculation circuit includes: a second regulated voltage source providing a regulated voltage source for a control system of the electrically powered device; and the voltage difference calculation circuit can calculate the voltage difference between the voltage of the power supply and the reference voltage through voltage division.
Optionally, the compensation circuit comprises: the second operational amplifier is used for amplifying the voltage division value of the first voltage division circuit output by the voltage output end of the temperature acquisition circuit; and the adder is used for calculating a compensation voltage value based on the divided voltage value of the first voltage dividing circuit and the voltage difference value so as to perform voltage compensation on the voltage of the power supply.
Optionally, the compensation circuit is further configured to control the compensation circuit to increase the divided voltage value of the first voltage dividing circuit when the absolute value of the voltage difference indicates that the voltage value of the power supply is lower than a preset power supply voltage threshold; and under the condition that the absolute value of the voltage difference value indicates that the voltage value of the power supply is greater than a preset power supply voltage threshold value, controlling a compensation circuit to reduce the divided voltage value of the first voltage dividing circuit.
Optionally, the control unit is connected to a voltage output end of the compensation circuit, and performs conversion processing on the divided voltage value of the first voltage dividing circuit after voltage compensation is completed, so as to obtain the battery temperature of the target battery.
According to another aspect of the embodiment of the present invention, there is also provided an electric device battery management system, including the temperature acquisition compensation circuit described in any one of the above.
According to another aspect of the embodiments of the present invention, there is also provided a temperature acquisition compensation method, including: collecting a voltage division value of a first voltage division circuit to calculate the battery temperature of a target battery; calculating a voltage difference value between a voltage value of the power supply and a reference voltage value; and if the absolute value of the voltage difference is larger than a preset value, determining that the voltage of the power supply fluctuates, and performing voltage compensation on the voltage of the power supply so as to enable the voltage value input to the control unit to be a normal divided voltage value.
Optionally, the step of performing voltage compensation on the voltage of the power supply includes: if the absolute value of the voltage difference value indicates that the voltage value of the power supply is lower than a preset power supply voltage threshold value, controlling a compensation circuit to increase the divided voltage value of the first voltage dividing circuit; and if the absolute value of the voltage difference value indicates that the voltage value of the power supply is greater than a preset power supply voltage threshold value, controlling a compensation circuit to reduce the divided voltage value of the first voltage dividing circuit.
According to another aspect of the embodiments of the present invention, there is also provided a storage medium, where the storage medium includes a stored program, and when the program runs, the apparatus where the storage medium is located is controlled to execute any one of the temperature acquisition compensation methods described above.
In the embodiment of the invention, the divided voltage value of the first voltage dividing circuit is acquired by the temperature acquisition circuit, the temperature change of the battery is reflected in real time by the voltage value, the reference voltage which is the same as the normal power supply voltage of the power supply is provided by the reference voltage construction circuit, the voltage difference between the voltage of the power supply and the reference voltage is calculated by the voltage difference calculation circuit, the voltage of the power supply is determined to fluctuate by the compensation circuit when the absolute value of the voltage difference is larger than a preset value, and the voltage of the power supply is compensated, so that the voltage value input to the control unit is the normal divided voltage value. That is, in this embodiment, when the sampling voltage is abnormally increased or decreased, the voltage may be decreased or increased, and it is ensured that the control unit still acquires correct voltage information, so that the temperature protection measures of the control unit do not malfunction due to fluctuation of the power supply, and it is not necessary to detect a fault by using an algorithm through a chip, thereby saving the resources of the control unit, and protecting the safety of vehicles and people, and thus solving the technical problem that the temperature acquisition circuit in the related art is easily affected by fluctuation of the power supply, which results in errors in temperature acquisition.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a prior art temperature acquisition circuit;
FIG. 2 is a schematic diagram of an alternative temperature acquisition compensation circuit according to an embodiment of the present invention;
fig. 3 is a flow chart of an alternative temperature acquisition compensation method according to an embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention can be applied to various electric equipment capable of managing the battery pack, such as an electric vehicle. The temperature acquisition compensation circuit is used for solving the problem that a temperature acquisition circuit of a battery management system in the prior art cannot ensure that a control chip acquires accurate and error-free temperature information when the voltage value of a power supply changes, and can ensure that the temperature information acquired by the control chip is still accurate when the external temperature is unchanged and the voltage of the power supply of the temperature acquisition circuit fluctuates. The temperature protection measures are guaranteed not to generate false operation due to the interference of the voltage value change of the power supply, passengers, the vehicle and the road safety are guaranteed to the maximum extent, and the possibility of road safety accidents is reduced.
By the temperature acquisition compensation circuit provided by the embodiment of the invention, when the voltage value of the power supply of the temperature acquisition circuit is normal, the temperature can be monitored in real time, and the temperature information obtained by the control chip is real temperature information; when the voltage value of the power supply of the temperature acquisition circuit is increased and the temperature is not changed, the voltage input to the control chip is compensated to be reduced, so that the temperature information obtained by the control chip is real temperature information; meanwhile, when the voltage value of the power supply of the temperature acquisition circuit becomes low and the temperature does not change, the voltage input into the control chip is compensated to be high, so that the temperature information obtained by the control chip is real temperature information; the main control chip MCU is not needed to do algorithm to remove the fault, and only the normal operation program is needed, so that the operation reliability and the safety of the equipment are greatly improved.
Fig. 2 is a schematic diagram of an alternative temperature acquisition compensation circuit according to an embodiment of the present invention, as shown in fig. 2, the temperature acquisition compensation circuit includes: a temperature acquisition circuit 21, a reference voltage construction circuit 22, a voltage difference calculation circuit 23, a compensation circuit 24, wherein,
temperature acquisition circuit 21, includes at least: the temperature acquisition circuit is used for acquiring the voltage division value of the first voltage division circuit so as to calculate the battery temperature of the target battery, and the power supply provides a voltage source for the temperature acquisition circuit.
Optionally, the temperature acquisition circuit may be disposed on a control system of the electric device (e.g., an electric vehicle), and the temperature acquisition circuit further includes: the temperature sensing circuit is used for measuring the battery temperature of a target battery (which can be understood as a battery pack or each battery cell module in the battery pack), wherein when the circuit value of the temperature sensing circuit changes along with the temperature change of the target battery, the voltage division value of the first voltage division circuit changes; a filter circuit comprising at least: the second voltage division circuit and the filtering module are used for filtering the acquired voltage division value of the first voltage division circuit; and the voltage output end is used for outputting the voltage division value of the first voltage division circuit after the filtering processing.
As shown in fig. 2, the first voltage dividing circuit includes a voltage dividing resistor R2, and the power supply is VCC 1. Wherein R1 is a thermistor, the resistance of which changes with the temperature; r2 is a divider resistor, and temperature change can be reflected by collecting the resistance value of the divider resistor R2; VCC1 is the power supply that provides a voltage source for the temperature acquisition circuit. The C1, R3 and C2 form a filter circuit, wherein the resistor R3 can be understood as a module where the second voltage division circuit is located, and they filter the voltage value input to the control chip. UO is the voltage output terminal.
A reference voltage building circuit 22 for providing a reference voltage identical to the normal supply voltage of the power supply.
As an alternative embodiment of the present invention, the reference voltage constructing circuit includes: the first stable voltage source is used for providing a stable voltage source for a control system of the electric equipment; the third voltage division circuit and the fourth voltage division circuit are used for dividing the voltage of the first stable voltage source, wherein the reference voltage construction circuit constructs a reference voltage through the divided voltage and the first stable voltage source; and the first operational amplifier is used for amplifying the voltage value of the processing reference voltage.
As shown in fig. 2, VCC2 is a voltage source (which may be understood as the first stable voltage source) that is relatively stable in the system, R4 and R5 are voltage dividing resistors (where the circuit of R4 may be understood as the third voltage dividing circuit, and the circuit of R5 may be understood as the fourth voltage dividing circuit), a reference voltage constructing circuit is formed by VCC2, R4, and R5, a normal reference voltage VCC1 of a power supply may be constructed by changing resistance values of R4 and R5, and the VCC1 is the same as the normal power supply voltage of the power supply.
In fig. 2, the temperature acquisition compensation circuit further includes a first operational amplifier a1, wherein a1 is a voltage follower for following the previously constructed normal reference voltage VCC 1.
In the calculation, the normal reference voltage VCC1 may be calculated using the following first formula:
and a voltage difference value calculation circuit 23 connected to the reference voltage construction circuit, for calculating a voltage difference value between the voltage of the power supply and the reference voltage.
And calculating the difference between the power supply voltage and the stable reference voltage through a voltage difference value calculating circuit, and adjusting according to the proportion.
Optionally, the voltage difference calculation circuit includes: a second stable voltage source for providing a stable voltage source for a control system of the electrically powered device; and the voltage difference calculation circuit can calculate the voltage difference between the voltage of the power supply and the reference voltage through voltage division.
As shown in fig. 2, a2, R6, R7, R8 and R9 constitute a subtraction operator, and the difference Δ VCC between VCC1 and VCC1 can be calculated by changing the resistances of R6, R7, R8 and R9. The subtraction unit comprises a second stable voltage source VCC3, a fifth voltage dividing circuit and a sixth voltage dividing circuit, wherein the circuit comprising the resistor R6 and the resistor R7 can be understood as the fifth voltage dividing circuit, and the circuit comprising the resistor R8 and the resistor R9 can be understood as the sixth voltage dividing circuit. In fig. 2, a2 may be understood as an operational amplifier.
In the calculation, the voltage difference Δ VCC may be calculated by using a second formula:
and the compensating circuit 24 is respectively connected with the voltage output end of the temperature acquisition circuit and the output end of the voltage difference value calculating circuit, and is used for determining that the voltage of the power supply fluctuates and compensating the voltage of the power supply when the absolute value of the voltage difference value is greater than a preset value so as to enable the voltage value input to the control unit to be a normal voltage dividing value.
Optionally, the compensation circuit includes: the second operational amplifier is used for amplifying the voltage division value of the first voltage division circuit output by the voltage output end of the temperature acquisition circuit; and the adder is used for calculating a compensation voltage value based on the divided voltage value and the voltage difference value of the first voltage dividing circuit so as to perform voltage compensation on the voltage of the power supply.
As shown in FIG. 2, the operational amplifier A3 constitutes oneAnd the voltage follower A3 is used for following the UO, and the R10, the R11, the R12, the R13 and the A4 form an adder, and the UO and the delta VCC can be added by changing the resistance values of the R10, the R11, the R12 and the R13. UO1 indicates a voltage compensation value, and when calculated, UO1 may be calculated by a third formula:
when the temperature is not changed and the voltage of the power supply of the temperature acquisition circuit is changed, the voltage is reduced when the sampling voltage is abnormally increased through the compensation circuit, and the voltage is increased when the sampling voltage is abnormally reduced, so that the control chip is ensured to still acquire correct voltage information.
The temperature acquisition compensation circuit can acquire the voltage division value of the first voltage division circuit through the temperature acquisition circuit 21, reflect the temperature change of the battery in real time through the voltage value, provide the reference voltage which is the same as the normal power supply voltage of the power supply through the reference voltage construction circuit 22, calculate the voltage difference value between the voltage of the power supply and the reference voltage through the voltage difference value calculation circuit 23, determine the voltage fluctuation of the power supply through the compensation circuit 24 when the absolute value of the voltage difference value is larger than a preset value, and compensate the voltage of the power supply, so that the voltage value input to the control unit is the normal voltage division value. That is, in this embodiment, when the sampling voltage is abnormally increased or decreased, the voltage may be decreased or increased, and it is ensured that the control unit still acquires correct voltage information, so that the temperature protection measures of the control unit do not malfunction due to fluctuation of the power supply, and it is not necessary to detect a fault by using an algorithm through a chip, thereby saving the resources of the control unit, and protecting the safety of vehicles and people, and thus solving the technical problem that the temperature acquisition circuit in the related art is easily affected by fluctuation of the power supply, which results in errors in temperature acquisition.
In the embodiment of the invention, the control unit is connected with the voltage output end of the compensation circuit and is used for converting the divided voltage value of the first voltage dividing circuit after voltage compensation is completed so as to obtain the battery temperature of the target battery.
When the compensation circuit is controlled to perform voltage compensation, the compensation circuit can be controlled to increase the voltage division value of the first voltage division circuit under the condition that the absolute value of the voltage difference value indicates that the voltage value of the power supply is lower than a preset power supply voltage threshold value; and under the condition that the absolute value of the voltage difference value indicates that the voltage value of the power supply is greater than the preset power supply voltage threshold value, the compensation circuit is controlled to reduce the divided voltage value of the first voltage dividing circuit.
Namely, compensation control is performed separately for three cases of the power supply.
1. The voltage of the power supply is stable, at the moment, the difference value between the voltage of the power supply and the reference voltage is zero, the output of the output compensation circuit of the fluctuation voltage difference value calculation circuit is zero, the output of the compensation circuit is zero, the voltage compensation correspondingly input into the control unit is zero, and at the moment, the temperature acquisition circuit works normally. The voltage values obtained by the control unit can be used to calculate corresponding temperature values.
2. The voltage of the power supply is reduced/decreased, at the moment, the difference value between the voltage of the power supply and the reference voltage is not zero, the output of an output compensation circuit of the fluctuation voltage difference value calculation circuit is not zero, the compensation circuit compensates the divided voltage on the voltage dividing resistor to increase the voltage, the voltage input into the control unit is the voltage when the power supply voltage does not fluctuate, and the temperature acquisition circuit normally works after compensation. The voltage values obtained by the control unit can be used to calculate corresponding temperature values.
3. The power supply voltage becomes large, at the moment, the difference value between the power supply voltage and the reference voltage is not zero, the output of an output compensation circuit of the fluctuation voltage difference value calculation circuit is not zero, the compensation circuit compensates the divided voltage on the voltage dividing resistor to reduce the divided voltage, the voltage input into the controller chip is the voltage when the power supply voltage does not fluctuate, and the temperature acquisition circuit normally works after compensation. The voltage values obtained by the controller chip can be used for calculating corresponding temperature values.
According to another aspect of the embodiment of the invention, there is also provided an electric device battery management system, which includes the temperature acquisition compensation circuit in any one of the above. The electrically powered device battery management system may include, but is not limited to: provided is an electric vehicle management system.
In accordance with an embodiment of the present invention, there is provided an embodiment of a temperature acquisition compensation method, it is noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in an order different than that presented herein.
The temperature acquisition compensation method provided by the embodiment of the invention can be applied to a temperature acquisition compensation circuit.
Fig. 3 is a flow chart of an alternative temperature acquisition compensation method according to an embodiment of the present invention, as shown in fig. 3, the compensation method includes:
step S302, collecting a voltage division value of a first voltage division circuit to calculate the battery temperature of a target battery;
step S304, calculating a voltage difference value between the voltage value of the power supply and the reference voltage value;
step S306, if the absolute value of the voltage difference is larger than the preset value, determining that the voltage of the power supply fluctuates, and performing voltage compensation on the voltage of the power supply so as to enable the voltage value input to the control unit to be a normal divided voltage value.
The temperature acquisition compensation method can be used for acquiring the voltage division value of the first voltage division circuit to calculate the battery temperature of the target battery, then calculating the voltage difference value between the voltage value of the power supply and the reference voltage value, determining that the voltage of the power supply fluctuates if the absolute value of the voltage difference value is larger than a preset value, and performing voltage compensation on the voltage of the power supply to enable the voltage value input to the control unit to be the normal voltage division value. In the embodiment, when the sampling voltage is abnormally increased or reduced, the voltage can be reduced or increased, and the control unit is ensured to still acquire correct voltage information, so that the temperature protection measures of the control unit can not be in misoperation due to the fluctuation of a power supply, the fault is not required to be detected by adopting an algorithm through a chip, the resources of the control unit are saved, the safety of vehicles and people can be protected, and the technical problem that the temperature acquisition circuit is easily influenced by the fluctuation of the power supply in the related technology to cause the error in temperature acquisition is solved.
Optionally, the step of performing voltage compensation on the voltage of the power supply includes: if the absolute value of the voltage difference value indicates that the voltage value of the power supply is lower than a preset power supply voltage threshold value, controlling the compensation circuit to increase the voltage division value of the first voltage division circuit; and if the absolute value of the voltage difference value indicates that the voltage value of the power supply is greater than the preset power supply voltage threshold value, the compensation circuit is controlled to reduce the divided voltage value of the first voltage dividing circuit.
According to another aspect of the embodiments of the present invention, there is also provided a storage medium, where the storage medium includes a stored program, and when the program runs, the apparatus where the storage medium is located is controlled to execute the temperature acquisition compensation method according to any one of the above.
The present application further provides a computer program product adapted to perform a program for initializing the following method steps when executed on a data processing device: collecting a voltage division value of the first voltage division circuit to calculate the battery temperature of the target battery, then calculating a voltage difference value between the voltage value of the power supply and a reference voltage value, if the absolute value of the voltage difference value is larger than a preset value, determining that the voltage of the power supply fluctuates, and performing voltage compensation on the voltage of the power supply to enable the voltage value input to the control unit to be a normal voltage division value.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A temperature acquisition compensation circuit, comprising:
temperature acquisition circuitry comprising at least: the temperature acquisition circuit is used for acquiring a divided voltage value of the first voltage division circuit to calculate the battery temperature of a target battery, and the power supply provides a voltage source for the temperature acquisition circuit;
the reference voltage construction circuit is used for providing a reference voltage which is the same as the normal power supply voltage of the power supply;
the voltage difference value calculation circuit is connected with the reference voltage construction circuit and is used for calculating a voltage difference value between the voltage of the power supply and the reference voltage;
the compensating circuit, respectively with temperature acquisition circuit's voltage output end with voltage difference calculation circuit's output is connected, is used for when the absolute value of voltage difference is greater than preset numerical value, confirms power supply's voltage takes place undulant, and right power supply's voltage compensates to the voltage value that makes input to the control unit is normal partial voltage value, temperature acquisition circuit sets up on electric equipment's control system, temperature acquisition circuit still includes: a thermosensitive circuit for measuring a battery temperature of the target battery, wherein a divided voltage value of the first voltage dividing circuit changes when a circuit value of the thermosensitive circuit changes with a change in the temperature of the target battery; a filter circuit comprising at least: the second voltage division circuit and the filtering module are used for filtering the acquired voltage division value of the first voltage division circuit; a voltage output terminal, configured to output a voltage-divided value of the first voltage-dividing circuit after filtering, where the voltage difference calculation circuit includes: a second regulated voltage source providing a regulated voltage source for a control system of the electrically powered device; and the voltage difference calculation circuit can calculate the voltage difference between the voltage of the power supply and the reference voltage through voltage division.
2. The compensation circuit of claim 1, wherein the reference voltage building circuit comprises:
a first regulated voltage source providing a regulated voltage source for a control system of the electrically powered device;
a third voltage dividing circuit and a fourth voltage dividing circuit for dividing the voltage of the first stable voltage source, wherein the reference voltage constructing circuit constructs the reference voltage by dividing the voltage with the first stable voltage source;
and the first operational amplifier is used for amplifying and processing the voltage value of the reference voltage.
3. The compensation circuit of claim 1, wherein the compensation circuit comprises:
the second operational amplifier is used for amplifying the voltage division value of the first voltage division circuit output by the voltage output end of the temperature acquisition circuit;
and the adder is used for calculating a compensation voltage value based on the divided voltage value of the first voltage dividing circuit and the voltage difference value so as to perform voltage compensation on the voltage of the power supply.
4. The compensation circuit of claim 3, further configured to control the compensation circuit to increase the divided voltage value of the first voltage dividing circuit if the absolute value of the voltage difference value indicates that the voltage value of the power supply is lower than a preset power supply voltage threshold; and under the condition that the absolute value of the voltage difference value indicates that the voltage value of the power supply is greater than a preset power supply voltage threshold value, controlling a compensation circuit to reduce the divided voltage value of the first voltage dividing circuit.
5. The compensation circuit of claim 4, wherein the control unit is connected to a voltage output terminal of the compensation circuit, and configured to perform conversion processing on the divided voltage value of the first voltage dividing circuit after voltage compensation is completed, so as to obtain the battery temperature of the target battery.
6. An electrical equipment battery management system comprising the temperature acquisition compensation circuit of any one of claims 1 to 5.
7. A method of temperature acquisition compensation, comprising:
collecting a voltage division value of a first voltage division circuit to calculate the battery temperature of a target battery;
calculating a voltage difference value between a voltage value of the power supply and a reference voltage value;
if the absolute value of the voltage difference is larger than a preset value, determining that the voltage of the power supply fluctuates, performing voltage compensation on the voltage of the power supply to enable the voltage value input to the control unit to be a normal divided voltage value, and calculating the voltage difference between the voltage value of the power supply and the reference voltage value, wherein the method comprises the following steps: a control voltage difference value calculation circuit calculates a voltage difference value between the voltage of the power supply source and the reference voltage by dividing the voltage, wherein the voltage difference value calculation circuit includes: a second stable voltage source for providing a stable voltage source for a control system of the electrically powered device; and the fifth voltage division circuit and the sixth voltage division circuit are used for dividing the voltage of the second stable voltage source.
8. The compensation method of claim 7, wherein the step of voltage compensating the voltage of the power supply comprises:
if the absolute value of the voltage difference value indicates that the voltage value of the power supply is lower than a preset power supply voltage threshold value, controlling a compensation circuit to increase the divided voltage value of the first voltage dividing circuit;
and if the absolute value of the voltage difference value indicates that the voltage value of the power supply is greater than a preset power supply voltage threshold value, controlling a compensation circuit to reduce the divided voltage value of the first voltage dividing circuit.
9. A storage medium, characterized in that the storage medium comprises a stored program, wherein when the program runs, the storage medium is controlled by a device to execute the temperature acquisition compensation method according to any one of claims 7 to 8.
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| CN117277541B (en) * | 2023-11-20 | 2024-04-05 | 深圳市创诺新电子科技有限公司 | Airborne emergency power supply system and airborne emergency power supply |
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| CN104236009A (en) * | 2013-06-20 | 2014-12-24 | 广东美的制冷设备有限公司 | Conditioner signal acquisition compensating device and method |
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