Battery voltage simulation circuit and system, and power battery practical training device

Abstract

A battery voltage simulation circuit (1) and system, and a power battery practical training device. The battery voltage simulation circuit comprises: an isolation connection unit (10), a control unit (20), and a conversion output unit (30). An input end of the isolation connection unit (10) is configured to electrically connect to an external input device (A), and an output end of the isolation connection unit (10) is electrically connected to an input end of the control unit (20); an output end of the control unit (20) is electrically connected to an input end of the conversion output unit (30); an output end of the conversion output unit (30) is configured to electrically connect to a simulated battery cell (B); the isolation connection unit (10) electrically isolates the control unit (20) from the external input device (A), and receives a required voltage signal transmitted by the external input device (A); the control unit (20) is used for outputting, in response to the required voltage signal, a pulse modulation signal having a target duty cycle to the conversion output unit (30), wherein different required voltage signals correspond to different duty cycles of the pulse modulation signal; and the conversion output unit (30) converts the pulse modulation signal having the target duty cycle into a corresponding voltage simulation signal, such that the simulated battery cell (B) performs simulation output.

Description

Battery voltage simulation circuit, system and its power battery training tools Cross-reference of related applications

[0001] This application claims priority to Chinese Patent Application No. 202423183247.X, filed on December 23, 2024, entitled “Battery Voltage Simulation Circuit, System and Power Battery Training Tool Thereof”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to a battery voltage simulation circuit, system, and its power battery training tool. Background Technology

[0003] Batteries are a common power source used in many experiments (such as as training tools). If a battery prototype is used directly for research, on the one hand, purchasing and maintaining the battery prototype requires a lot of money, and on the other hand, it will bring the risk of damage when conducting experiments under extreme conditions. Therefore, circuits that simulate battery voltage output are commonly used to accurately simulate the output characteristics of batteries, and then replace batteries in experiments. This can solve the above problems, thereby greatly reducing research costs and accelerating research progress.

[0004] However, most commonly used analog battery voltage output circuits can only simulate the actual battery voltage required for output, and cannot adjust the analog voltage to achieve the practical training effect of battery faults. Summary of the Invention

[0005] In view of the above problems, this application provides a battery voltage simulation circuit, system and power battery training tool, which can solve the problem that the commonly used simulated battery voltage output circuit can only simulate the actual battery voltage required for output, and cannot adjust the simulated voltage to achieve the training effect of battery faults.

[0006] In a first aspect, this application provides a battery voltage simulation circuit, comprising: an isolation connection unit, a control unit, and a conversion output unit; the input terminal of the isolation connection unit is electrically connected to an external input device, the output terminal of the isolation connection unit is electrically connected to the input terminal of the control unit, the output terminal of the control unit is electrically connected to the input terminal of the conversion output unit, and the output terminal of the conversion output unit is electrically connected to a simulated battery cell; the isolation connection unit is used to electrically isolate the control unit from the external input device, and receive a demand voltage signal transmitted by the external input device, and transmit the demand voltage signal to the control unit; the control unit is used to respond to the demand voltage signal by outputting a pulse modulation signal with a target duty cycle to the conversion output unit, wherein the duty cycle of the pulse modulation signal corresponds to different demand voltage signals; the conversion output unit is used to convert the pulse modulation signal with the target duty cycle into a corresponding voltage simulation signal, so that the simulated battery cell simulates the output of the demand voltage.

[0007] The battery voltage simulation circuit designed above stores the correlation between different demand voltage signals and their corresponding duty cycles through a control unit. Thus, when different demand voltage signals are received, a pulse modulation signal with the corresponding duty cycle of the demand voltage can be output based on the demand voltage signal. After digital-to-analog conversion of the pulse modulation signal, the output of the simulated battery voltage can be realized. Furthermore, by using pulse modulation signals with different duty cycles, different simulated battery voltages can be adjusted. This enables high-precision simulation and adjustment of battery voltage, meeting the needs of various application scenarios with high requirements for battery voltage accuracy, such as teaching experiments.

[0008] In some embodiments, the isolation connection unit includes a communication component and an isolation drive component; the input terminal of the communication component is electrically connected to an external input device, the output terminal of the communication component is electrically connected to the input terminal of the isolation drive component, and the output terminal of the isolation drive component is electrically connected to a control unit; the communication component is used to forward the demand voltage signal transmitted by the external input device to the isolation drive component; the isolation drive component is used to electrically isolate the control unit from the external input device and transmit the demand voltage signal to the control unit.

[0009] In the above-described implementation, the design of the isolation connection unit effectively isolates external input devices from the control unit, preventing external interference from affecting the internal circuit, improving the stability and reliability of the entire circuit system, and reducing the possibility of voltage simulation errors and circuit failures caused by external interference.

[0010] In some embodiments, the conversion output unit includes at least one digital-to-analog converter (DAC) group, wherein each DAC group includes a DAC and an operational amplifier. The input terminal of the DAC in each DAC group is electrically connected to the output terminal of the control unit, and the output terminal of the DAC in each DAC group is connected to the input terminal of the operational amplifier in the corresponding DAC group. The output terminal of each operational amplifier is used to be electrically connected to an analog battery cell. The DAC is used to convert the pulse modulation signal with a target duty cycle into a corresponding analog voltage signal and transmit it to the operational amplifier. The operational amplifier is used to amplify the analog voltage signal and output it so that the corresponding connected analog battery cell outputs the required voltage.

[0011] In some embodiments, the number of digital-to-analog conversion groups may include one or more.

[0012] In the above implementation scheme, the control unit is designed to connect to multiple analog-to-digital converters at one time, so that the control unit can simulate and adjust the voltage of multiple simulated battery cells at one time. In this way, while sampling multiple simulated battery cells for voltage simulation, the device distribution space is reduced and the device resource cost is saved.

[0013] In some embodiments, the battery voltage simulation circuit further includes a power supply unit; the power supply unit is electrically connected to the isolation connection unit and the control unit respectively, for supplying power to the isolation connection unit and the control unit.

[0014] In some embodiments, the power supply unit includes a power supply and a step-down component; the power supply is electrically connected to the isolation connection unit and the control unit respectively through the step-down component; the step-down component is used to step down the supply voltage of the power supply to a first supply voltage and a second supply voltage; wherein the first supply voltage is used to supply power to the isolation connection unit and the second supply voltage is used to supply power to the control unit.

[0015] In the above implementation, this solution uses a step-down component to reduce the power supply voltage to the voltage at which the isolation connection unit and control unit operate normally, thereby ensuring the normal operation of the isolation connection unit and control unit and avoiding the impact of high voltage on the service life of the isolation connection unit and control unit.

[0016] In some embodiments, the step-down assembly includes a step-down module and an isolated power supply module; the input terminal of the step-down module is electrically connected to the power supply, and the output terminal of the step-down module is electrically connected to the isolation connection unit and the control unit respectively through the isolated power supply module; the step-down module is used to step down the supply voltage of the power supply to a first supply voltage and a second supply voltage, and transmit the first supply voltage and the second supply voltage to the isolated power supply module; the isolated power supply module is used to transmit the first supply voltage to the isolation connection unit, transmit the second supply voltage to the control unit, and electrically isolate the isolation connection unit and the control unit from the power supply.

[0017] In the above implementation method, this solution achieves electrical isolation of the power supply through an isolation power module, so that the battery voltage simulation circuit will not have problems with excessive or insufficient power supply current, thereby improving the safety of operators when operating the battery voltage simulation circuit.

[0018] Secondly, this application provides a battery voltage simulation system, including a battery voltage simulation circuit, an external input device, and a simulated battery cell as described in any optional embodiment of the first aspect; the input terminal of the isolation connection unit is electrically connected to the external input device, and the conversion output unit is electrically connected to the simulated battery cell.

[0019] The battery voltage simulation system designed above, because it includes the battery voltage simulation circuit described earlier, can store the correlation between different demand voltage signals and their corresponding duty cycles in the control unit. Thus, upon receiving different demand voltage signals, it can output a pulse modulation signal with the corresponding duty cycle based on the demand voltage signal. After digital-to-analog conversion of the pulse modulation signal, the simulated battery voltage can be output. Furthermore, by using pulse modulation signals with different duty cycles, different simulated battery voltages can be adjusted, achieving high-precision simulation and adjustment of battery voltage. This meets the needs of various applications requiring high battery voltage accuracy, such as teaching experiments. In addition, the isolation connection unit design of this scheme effectively isolates external input devices from the control unit, preventing external interference from affecting the internal circuitry, improving the stability and reliability of the entire circuit system, and reducing the possibility of voltage simulation errors and circuit failures caused by external interference.

[0020] In some embodiments, there are multiple battery voltage simulation circuits, and the battery voltage simulation system also includes a communication bus, through which external input devices are electrically connected to the isolation connection unit of each battery voltage simulation circuit.

[0021] In the above-described embodiments, the battery voltage simulation system designed in this solution connects multiple battery voltage simulation circuits through a communication bus, which can easily expand the number of simulated battery cells and adapt to the simulation needs of battery packs of different sizes. It can be flexibly applied to both small-scale laboratory tests and large-scale industrial R&D projects.

[0022] Thirdly, this application provides a power battery training tool, which includes a battery voltage simulation system according to any optional embodiment of the second aspect.

[0023] The aforementioned power battery training tool, incorporating the battery voltage simulation system described earlier, allows the control unit to store the correlation between different demand voltage signals and their corresponding duty cycles. Upon receiving different demand voltage signals, it can output a pulse modulation signal with the corresponding duty cycle based on the demand voltage signal. This pulse modulation signal, after digital-to-analog conversion, simulates the battery voltage output. Furthermore, by using pulse modulation signals with different duty cycles, different simulated battery voltages can be adjusted, achieving high-precision simulation and adjustment of the battery voltage. This meets the needs of various applications requiring high battery voltage accuracy, such as teaching experiments. Additionally, the isolation connection unit effectively isolates external input devices from the control unit, preventing external interference from affecting the internal circuitry, improving the stability and reliability of the entire circuit system, and reducing the possibility of voltage simulation errors and circuit failures caused by external interference.

[0024] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0026] Figure 1 is a first circuit diagram of the battery voltage simulation circuit provided in an embodiment of this application;

[0027] Figure 2 is a second circuit diagram of the battery voltage simulation circuit provided in an embodiment of this application;

[0028] Figure 3 is a schematic diagram of the third circuit of the battery voltage simulation circuit provided in the embodiment of this application;

[0029] Figure 4 is a fourth circuit diagram of the battery voltage simulation circuit provided in the embodiment of this application;

[0030] Figure 5 is a fifth circuit diagram of the battery voltage simulation circuit provided in the embodiment of this application;

[0031] Figure 6 is a schematic diagram of the sixth circuit of the battery voltage simulation circuit provided in the embodiment of this application;

[0032] Figure 7 is a circuit diagram of the isolated power supply module provided in an embodiment of this application;

[0033] Figure 8 is a schematic diagram of the first circuit of the battery voltage simulation system provided in an embodiment of this application;

[0034] Figure 9 is a schematic diagram of the second circuit of the battery voltage simulation system provided in the embodiment of this application.

[0035] Icons: A - External input device; B - Analog battery cell; C - Communication bus; 1 - Battery voltage analog circuit; 10 - Isolation connection unit; 110 - Communication component; 120 - Isolation drive component; 20 - Control unit; 30 - Conversion output unit; 310 - Digital-to-analog converter group; 3110 - Digital-to-analog converter; 3120 - Operational amplifier; 40 - Power supply unit; 410 - Power supply; 420 - Buck converter component; 4210 - Buck module; 4220 - Isolation power supply module. Detailed Implementation

[0036] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0038] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0039] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0041] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0042] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0043] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0044] Batteries are a common power source used in many experiments (such as as training tools). If a battery prototype is used directly for research, on the one hand, purchasing and maintaining the battery prototype requires a lot of money, and on the other hand, it will bring the risk of damage when conducting experiments under extreme conditions. Therefore, circuits that simulate battery voltage output are commonly used to accurately simulate the output characteristics of batteries, and then replace batteries in experiments. This can solve the above problems, thereby greatly reducing research costs and accelerating research progress.

[0045] However, most commonly used analog battery voltage output circuits can only simulate the actual battery voltage required for output, and cannot adjust the analog voltage to achieve the practical training effect of battery faults.

[0046] To address the aforementioned issues, this application designs a battery voltage simulation circuit, system, and power battery training tool. The control unit stores the correlation between different demand voltage signals and their corresponding duty cycles. Upon receiving different demand voltage signals, it can output a pulse modulation signal with the corresponding duty cycle based on the demand voltage signal. This pulse modulation signal is then converted from digital to analog to achieve the output of a simulated battery voltage. Furthermore, by using pulse modulation signals with different duty cycles, different simulated battery voltages can be adjusted, enabling high-precision simulation and adjustment of battery voltage. This meets the needs of various applications requiring high battery voltage accuracy, such as precision battery testing equipment and high-end teaching experiments. In addition, this solution uses an isolation connection unit to connect the control unit to external devices and provides electrical isolation, and an isolation power supply module to achieve electrical power isolation. This prevents the battery voltage simulation circuit from experiencing excessively high or low supply current, thereby improving the safety of operators when using the battery voltage simulation circuit.

[0047] Based on the above ideas, this application first provides a battery voltage simulation circuit, as shown in Figure 1. This battery voltage simulation circuit includes an isolation connection unit 10, a control unit 20, and a conversion output unit 30. The input terminal of the isolation connection unit 10 is electrically connected to an external input device A. The output terminal of the isolation connection unit 10 is electrically connected to the input terminal of the control unit 20. The output terminal of the control unit 20 is electrically connected to the input terminal of the conversion output unit 30. The output terminal of the conversion output unit 30 is electrically connected to a simulated battery cell B. The external input device A includes, but is not limited to, a computer, server, host computer, etc., and the simulated battery cell B represents a battery cell without injected electrolyte.

[0048] The battery voltage simulation circuit designed above uses isolation connection unit 10 to achieve electrical isolation between external input device A and control unit 20. Electrical isolation refers to the physical or electrical means of separating two or more electrical circuits in an electrical system to prevent current from flowing directly between them, while still allowing the transmission of signals or energy.

[0049] The isolation connection unit 10 can also receive a demand voltage signal transmitted by an external input device A. The demand voltage signal can be input by the user through the external input device A. The demand voltage signal represents a digital signal that requires the analog output voltage of the analog battery cell B. For example, the demand voltage signal is a digital signal with a voltage of 3V.

[0050] After receiving a demand voltage signal transmitted from external input device A, the isolation connection unit 10 can transmit the demand voltage signal to the control unit 20. The control unit 20, in response to the demand voltage signal, then outputs a pulse modulation signal with a target duty cycle to the conversion output unit 30. The control unit 20 stores the correlation between different demand voltage signals and their corresponding duty cycles. Different demand voltage signals correspond to different duty cycles in their pulse modulation signals. Upon receiving a demand voltage signal, the control unit 20 can look up the target duty cycle corresponding to that demand voltage signal and then output the pulse modulation signal with that target duty cycle. As one possible implementation, the control unit 20 may include a register in which the mapping relationship between different demand voltage signals and their corresponding duty cycles can be stored. The control unit can obtain the target duty cycle corresponding to the demand voltage signal by accessing the lookup register.

[0051] Specifically, this scheme can store the combination of demand voltage and duty cycle (e.g., the higher bits represent the demand voltage and the lower bits represent the corresponding duty cycle) in the register in binary code form in advance. The control unit 20 can find the combination in the register that is the same as the demand voltage signal based on the demand voltage signal (digital signal), thereby obtaining the duty cycle of the lower bits in the combination, and thus obtaining the target duty cycle.

[0052] After the control unit 20 outputs the pulse modulation signal of the target duty cycle, the conversion output unit 30 can convert the pulse modulation signal of the target duty cycle into the corresponding voltage analog signal, thereby enabling the simulated battery cell B to output the required voltage. In this way, this scheme can use the external input device A to make the simulated battery cell B output different voltages through the battery voltage simulation circuit, thereby simulating the fault voltage of the battery cell and realizing the teaching experiment of energy storage battery.

[0053] The battery voltage simulation circuit designed above stores the correlation between different demand voltage signals and their corresponding duty cycles in the control unit. Upon receiving different demand voltage signals, it can output a pulse modulation signal with the corresponding duty cycle based on the demand voltage signal. This pulse modulation signal is then converted from digital to analog to achieve the output of the simulated battery voltage. Furthermore, by using pulse modulation signals with different duty cycles, different simulated battery voltages can be adjusted, enabling high-precision simulation and adjustment of battery voltage. This meets the needs of various applications requiring high battery voltage accuracy, such as educational experiments. In addition, the isolation connection unit design effectively isolates external input devices from the control unit, preventing external interference from affecting the internal circuitry, improving the stability and reliability of the entire circuit system, and reducing the possibility of voltage simulation errors and circuit failures caused by external interference.

[0054] In an optional embodiment of this example, as shown in FIG2, the isolation connection unit 10 designed in this scheme may include a communication component 110 and an isolation drive component 120. The input terminal of the communication component 110 is used to be electrically connected to an external input device A, the output terminal of the communication component 110 is electrically connected to the input terminal of the isolation drive component 120, and the output terminal of the isolation drive component 120 is electrically connected to the control unit 20.

[0055] In the above embodiments, external input device A generally has an interface port. To enable the battery voltage simulation circuit designed in this solution to communicate with external input device A, this solution connects to external input device A through communication component 110 to achieve communication data transmission. For example, external input device A is a USB port. To overcome the incompatibility problem of communication protocols between external devices and the designed battery voltage simulation circuit, the communication component 110 designed in this solution can be a CAN module. The required voltage signal transmitted by external input device A is first transmitted to the CAN module through the USB port, and then forwarded to the isolation drive component 120 through the CAN module, thereby realizing interactive communication between the battery voltage simulation circuit and external input device A. The CAN (Controller Area Network) module is an electronic module used to realize communication between devices. This solution can specifically use any existing CAN module. In addition to using a CAN module for communication connection, this solution can also use other forms of communication components, such as wireless communication modules, Bluetooth modules, etc.

[0056] After receiving the demand voltage signal transmitted by the communication component 110, the isolation drive component 120 can forward the demand voltage signal to the control unit. Furthermore, the isolation drive component 120 can electrically isolate the control unit 20 from the external input device A. Specifically, the control unit 20 in this solution typically processes low-voltage, low-current digital signals, while the signal transmitted by the external input device A is a higher-voltage, higher-current signal. Therefore, the isolation drive component 120 needs to electrically isolate the demand voltage signal transmitted by the external input device A, reduce its size, and convert it into a digital signal suitable for the control unit 20, thereby achieving effective driving of the control unit 20.

[0057] Specifically, as one possible implementation, the isolation driver component 120 can employ an isolation driver chip. Specifically, it can utilize existing isolation driver chips for various signals, such as ISO1050 and SIT1050 models. These isolation driver chips employ intelligent voltage divider technology (iDivider) and mature standard semiconductor CMOS processes, significantly improving device performance and offering clear advantages in power consumption, transmission rate, and anti-interference capabilities. Utilizing the capacitive voltage divider principle, signals are transmitted directly through the isolation medium without modulation or demodulation. This solution can employ any existing isolation driver chip depending on the specific application scenario.

[0058] The above-described implementation effectively isolates external input devices from the control unit, preventing external interference from affecting the internal circuitry, improving the stability and reliability of the entire circuit system, and reducing the possibility of voltage simulation errors and circuit failures caused by external interference.

[0059] In an optional embodiment of this example, as shown in FIG3, the conversion output unit 30 may specifically include at least one digital-to-analog converter group 310, wherein each digital-to-analog converter group 310 includes a digital-to-analog converter 3110 and an operational amplifier 3120. The input terminal of the digital-to-analog converter 3110 of each digital-to-analog converter group 310 is electrically connected to the output terminal of the control unit 20, and the output terminal of the digital-to-analog converter 3110 of each digital-to-analog converter group 310 is connected to the input terminal of the operational amplifier 3120 of the corresponding digital-to-analog converter group 310. The output terminal of each operational amplifier 3120 is used to be electrically connected to an analog battery cell B.

[0060] In the above embodiments, the digital-to-analog converter is a device that converts digital signals into analog signals. In this application, the digital-to-analog converter 3110 can convert the pulse modulation signal (digital signal) with the target duty cycle transmitted by the control unit 20 into a corresponding voltage analog signal and transmit it to the corresponding operational amplifier 3120. The operational amplifier 3120 amplifies the voltage analog signal and outputs it, so that the analog battery cell B connected to the operational amplifier 3120 can output the required voltage.

[0061] In one possible implementation, the number of digital-to-analog converter groups 310 can be one as shown in Figure 3. In this case, the control unit 20 designed in this scheme can be electrically connected to a single analog battery cell B through only one digital-to-analog converter 3110 and one operational amplifier 3120, so that the control unit 20 can control the voltage simulation of only one analog battery cell B.

[0062] As another possible implementation, as shown in Figure 4, the number of digital-to-analog converter groups 310 designed in this scheme can be multiple (4 as shown in Figure 4). In this case, the control unit 20 designed in this scheme can connect 4 digital-to-analog converter groups 310 at one time, so that the control unit 20 can perform analog adjustment of the voltage of 4 analog battery cells B at one time.

[0063] In the above implementation scheme, the control unit is designed to connect to multiple analog-to-digital converters at one time, so that the control unit can simulate and adjust the voltage of multiple simulated battery cells at one time. In this way, while sampling multiple simulated battery cells for voltage simulation, the device distribution space is reduced and the device resource cost is saved.

[0064] In an optional embodiment of this solution, the control unit 20 designed in this solution can be a microcontroller, a central processing unit (CPU), etc. The specific device type and model can be adapted according to the actual application scenario. For example, this solution can use a 32-bit microcontroller, such as a microcontroller with model number STM32F103 or CS32F103.

[0065] In an optional embodiment of this invention, as shown in FIG5, the battery voltage simulation circuit designed in this scheme further includes a power supply unit 40, which is electrically connected to the isolation connection unit 10 and the control unit 20 respectively. The power supply unit 40 can supply power to the isolation connection unit 10 and the control unit 20.

[0066] As one possible implementation, the power supply voltage of the current power supply is generally not matched with the rated operating voltage of the isolation connection unit 10 and the control unit 20. Therefore, as shown in FIG6, the power supply unit 40 designed in this scheme may include a power supply 410 and a step-down component 420. The power supply 410 is electrically connected to the isolation connection unit 10 and the control unit 20 through the step-down component 420 respectively.

[0067] In the above embodiments, since the rated operating voltages of the isolation connection unit 10 and the control unit 20 are generally different, the step-down component 420 designed in this solution can step down the power supply voltage to the first power supply voltage and the second power supply voltage. The first power supply voltage is used to supply power to the isolation connection unit 10, and the second power supply voltage is used to supply power to the control unit 20.

[0068] For example, the rated operating voltage of the isolation connection unit 10 is 5V, the rated operating voltage of the control unit 20 is 3.3V, and the supply voltage of the power supply 410 is 12V. In this case, the step-down component 420 steps down the supply voltage of the power supply to 5V and 3.3V, where 5V supplies power to the isolation connection unit 10 and 3.3V supplies power to the control unit 20.

[0069] Specifically, as one possible implementation, when the isolation connection unit 10 includes a CAN module and an isolation driver chip, the step-down component 420 of this solution can simultaneously supply power to the CAN module and the isolation driver chip using the first supply voltage.

[0070] In an optional embodiment of this example, please continue to refer to Figure 6. The step-down component 420 designed in this scheme may specifically include a step-down module 4210 and an isolation power supply module 4220. The input terminal of the step-down module 4210 is electrically connected to the power supply 410, and the output terminal of the step-down module 4210 is electrically connected to the isolation connection unit 10 and the control unit 20 respectively through the isolation power supply module 4220.

[0071] In the above embodiment, the step-down module 4210 steps down the power supply voltage to the first power supply voltage and the second power supply voltage, and then transmits the first power supply voltage to the isolation connection unit 10 through the isolation power supply module 4220, and transmits the second power supply voltage to the control unit 20 through the isolation power supply module 4220, thereby realizing the electrical isolation between the isolation connection unit 10, the control unit 20 and the power supply 410.

[0072] The isolated power supply module 4220 separates the input and output, protecting downstream load devices and systems. It eliminates ground loops between isolation circuits, cuts off the propagation path of common-mode and surge interference signals, effectively reduces the impact of ground potential difference and wire coupling interference, and improves common-mode interference suppression performance and anti-interference capability. The isolated power supply module 4220 designed in this solution, as shown in Figure 7, adopts international standard SIP packaging, complies with RoHS directives, and has advantages such as small size, high power density, low output ripple noise, good thermal stability, and strong temperature characteristics. To further reduce input and output ripple, a capacitor filter network is connected at the input and output terminals. The isolation voltage of the isolated power supply can reach up to 1000V DC, and the insulation resistance can reach 1000MΩ, thus enabling the designed battery voltage simulation circuit to meet the insulation test withstand voltage requirements and improve the safety of operators.

[0073] Furthermore, the step-down module 4210 used in this solution can be any type of step-down circuit currently available, such as a capacitor step-down circuit, a resistor step-down circuit, an inductor step-down circuit, a step-down chip circuit, etc. Specifically, for example, this solution uses the first linear regulator chip AMS1117-5.0 to first reduce the 12V power supply voltage to a first supply voltage of 5V, using the first supply voltage of 5V to power the isolation connection unit 10. Then, the second linear regulator chip AMS1117-5.0 is used to reduce and regulate the first supply voltage of 5V to a second supply voltage of 3.3V, using the second supply voltage of 3.3V to power the control unit 20.

[0074] This application also provides a battery voltage simulation system, as shown in FIG8. The battery voltage simulation system includes a battery voltage simulation circuit 1 according to any of the embodiments described above, an external input device A, and a simulated single battery cell B, wherein the input terminal of the isolation connection unit 10 is electrically connected to the external input device A, and the conversion output unit 30 is electrically connected to the simulated single battery cell B.

[0075] The battery voltage simulation system designed above, because it includes the battery voltage simulation circuit described earlier, can store the correlation between different demand voltage signals and their corresponding duty cycles in the control unit. Thus, upon receiving different demand voltage signals, it can output a pulse modulation signal with the corresponding duty cycle based on the demand voltage signal. After digital-to-analog conversion of the pulse modulation signal, the simulated battery voltage can be output. Furthermore, by using pulse modulation signals with different duty cycles, different simulated battery voltages can be adjusted, achieving high-precision simulation and adjustment of battery voltage. This meets the needs of various applications requiring high battery voltage accuracy, such as teaching experiments. In addition, the isolation connection unit design of this scheme effectively isolates external input devices from the control unit, preventing external interference from affecting the internal circuitry, improving the stability and reliability of the entire circuit system, and reducing the possibility of voltage simulation errors and circuit failures caused by external interference.

[0076] In an optional embodiment of this example, as shown in FIG9, the battery voltage simulation system designed in this scheme may include multiple battery voltage simulation circuits 1. The battery voltage simulation system may also include a communication bus C. On this basis, an external input device A is electrically connected to the isolation connection unit 10 of each battery voltage simulation circuit 1 through the communication bus C.

[0077] In the above-described implementation, the battery voltage simulation system designed in this solution connects multiple battery voltage simulation circuits via a communication bus, which can easily expand the number of simulated battery cells and adapt to the simulation needs of battery packs of different sizes. It can be flexibly applied to both small-scale laboratory tests and large-scale industrial R&D projects.

[0078] This application also provides a power battery training tool, which includes a battery voltage simulation system of any of the optional embodiments described above.

[0079] The aforementioned power battery training tool, incorporating the battery voltage simulation system described earlier, allows the control unit to store the correlation between different demand voltage signals and their corresponding duty cycles. Upon receiving different demand voltage signals, it can output a pulse modulation signal with the corresponding duty cycle based on the demand voltage signal. This pulse modulation signal, after digital-to-analog conversion, simulates the battery voltage output. Furthermore, by using pulse modulation signals with different duty cycles, different simulated battery voltages can be adjusted, achieving high-precision simulation and adjustment of the battery voltage. This meets the needs of various applications requiring high battery voltage accuracy, such as teaching experiments. Additionally, the isolation connection unit effectively isolates external input devices from the control unit, preventing external interference from affecting the internal circuitry, improving the stability and reliability of the entire circuit system, and reducing the possibility of voltage simulation errors and circuit failures caused by external interference.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery voltage simulation circuit, characterized in that, include: Isolation connection unit, control unit, and conversion output unit; The input terminal of the isolation connection unit is used for electrical connection with an external input device, the output terminal of the isolation connection unit is electrically connected to the input terminal of the control unit, the output terminal of the control unit is electrically connected to the input terminal of the conversion output unit, and the output terminal of the conversion output unit is used for electrical connection with an analog battery cell. The isolation connection unit is used to electrically isolate the control unit from the external input device, and to receive the required voltage signal transmitted by the external input device and transmit the required voltage signal to the control unit. The control unit is used to respond to the demand voltage signal and output a pulse modulation signal with a target duty cycle to the conversion output unit, wherein the duty cycle of the pulse modulation signal is different for different demand voltage signals; The conversion output unit is used to convert the pulse modulation signal of the target duty cycle into a corresponding voltage analog signal so that the analog battery cell can simulate the output of the required voltage.

2. The battery voltage simulation circuit according to claim 1, characterized in that, The isolation connection unit includes a communication component and an isolation drive component; the input terminal of the communication component is used for electrical connection with an external input device, the output terminal of the communication component is electrically connected to the input terminal of the isolation drive component, and the output terminal of the isolation drive component is electrically connected to the control unit. The communication component is used to forward the required voltage signal transmitted by the external input device to the isolation drive component; The isolation drive component is used to electrically isolate the control unit from the external input device and transmit the required voltage signal to the control unit.

3. The battery voltage simulation circuit according to claim 1, characterized in that, The conversion output unit includes at least one digital-to-analog converter group, wherein each digital-to-analog converter group includes a digital-to-analog converter and an operational amplifier. The input terminal of the digital-to-analog converter in each digital-to-analog converter group is electrically connected to the output terminal of the control unit. The output terminal of the digital-to-analog converter in each digital-to-analog converter group is connected to the input terminal of the operational amplifier in the corresponding digital-to-analog converter group. The output terminal of each operational amplifier is used to be electrically connected to an analog battery cell. The digital-to-analog converter is used to convert the pulse modulation signal of the target duty cycle into a corresponding voltage analog signal and transmit it to the operational amplifier; The operational amplifier is used to amplify the analog voltage signal and output it so that the corresponding connected analog battery cell outputs the required voltage.

4. The battery voltage simulation circuit according to claim 3, characterized in that, The number of digital-to-analog conversion groups may be one or more.

5. The battery voltage simulation circuit according to claim 1, characterized in that, The battery voltage simulation circuit also includes a power supply unit; the power supply unit is electrically connected to the isolation connection unit and the control unit respectively, so as to supply power to the isolation connection unit and the control unit.

6. The battery voltage simulation circuit according to claim 5, characterized in that, The power supply unit includes a power supply and a step-down component; the power supply is electrically connected to the isolation connection unit and the control unit respectively through the step-down component; The step-down component is used to step down the supply voltage of the power supply to a first supply voltage and a second supply voltage; wherein the first supply voltage is used to supply power to the isolation connection unit, and the second supply voltage is used to supply power to the control unit.

7. The battery voltage simulation circuit according to claim 6, characterized in that, The step-down assembly includes a step-down module and an isolated power supply module; the input terminal of the step-down module is electrically connected to the power supply, and the output terminal of the step-down module is electrically connected to the isolated connection unit and the control unit respectively through the isolated power supply module; The step-down module is used to step down the supply voltage of the power supply to the first supply voltage and the second supply voltage, and transmit the first supply voltage and the second supply voltage to the isolation power supply module; The isolated power supply module is used to transmit the first power supply voltage to the isolated connection unit, transmit the second power supply voltage to the control unit, and electrically isolate the isolated connection unit and the control unit from the power supply.

8. A battery voltage simulation system, characterized in that, The battery voltage simulation system includes a battery voltage simulation circuit according to any one of claims 1-7, an external input device, and a simulated battery cell; the input terminal of the isolation connection unit is electrically connected to the external input device, and the conversion output unit is electrically connected to the simulated battery cell.

9. The battery voltage simulation system according to claim 8, characterized in that, The battery voltage simulation circuits are multiple in number, and the battery voltage simulation system also includes a communication bus. The external input device is electrically connected to the isolation connection unit of each battery voltage simulation circuit through the communication bus.

10. A power battery training tool, characterized in that, The power battery training tool includes the battery voltage simulation system as described in any one of claims 8-9.

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