Voltage-adjustable battery output analog circuit

Abstract

The utility model relates to the technical field of circuits, in particular to a voltage-adjustable battery output analog circuit. The power supply circuit is used for supplying power to the battery simulation output circuit and the battery simulation output adjusting circuit; the battery simulation output circuit comprises a linear voltage regulator, the linear voltage regulator receives the input voltage of the power supply circuit and outputs a battery simulation output voltage U3, and a regulation input end ADJ of the linear voltage regulator is used for providing a first reference voltage U2; the battery simulation output adjusting circuit is used for generating an adjusting voltage U1, and the adjusting voltage U1 is connected to an adjusting input end ADJ; the battery analog output voltage U3 is generated based on the adjusting voltage U1 and the first reference voltage U2; the battery simulation output adjusting circuit is also used for adjusting the adjusting voltage U1 based on the preset value Uo and the sampling value Ue of the output port Vout. Therefore, the accurate control of the battery simulation output voltage U3 is realized, and the requirement of a battery management system on a high-precision simulation battery is successfully met.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a battery output simulation circuit with adjustable voltage. Background Art

[0002] The rapid development of lithium-ion battery technology has placed higher demands on the testing and verification of battery management systems (BMS). As an essential and critical piece of equipment for BMS testing, a battery simulator must not only simulate the output voltage of a lithium-ion battery to meet the basic power characteristics required for testing but also be able to control and regulate this output voltage. This is crucial for ensuring the performance and safety of the BMS under various operating conditions.

[0003] However, current analog battery circuits on the market generally use a large number of discrete components, such as transistors and operational amplifiers. This not only reduces circuit integration but also increases circuit complexity and cost. More importantly, due to the lack of sophisticated voltage regulation design in traditional analog battery circuits, their regulation accuracy is limited, making it difficult to meet the high-precision regulation requirements of battery simulators required by modern battery management systems. Utility Model Content

[0004] The utility model relates to a battery output simulation circuit with adjustable voltage, which can overcome certain defects of the prior art.

[0005] A battery output simulation circuit with adjustable voltage, characterized in that it includes: a battery simulation output circuit, a battery simulation output regulation circuit and a power supply circuit, wherein the power supply circuit is used to supply power to the battery simulation output circuit and the battery simulation output regulation circuit;

[0006] The battery simulation output circuit includes a linear regulator having an input port Vin, an output port Vout, and an adjustment input terminal ADJ. The input port Vin is powered by a power supply circuit, the output port Vout is used to output a battery simulation output voltage U3, and the adjustment input terminal ADJ is used to provide a first reference voltage U2.

[0007] A first regulating resistor R1 is provided between the output port Vout and the regulating input terminal ADJ, and a second regulating circuit R2 is provided between the regulating input terminal ADJ and the ground terminal;

[0008] The battery simulation output regulation circuit is used to generate a regulation voltage U1, and the regulation voltage U1 is connected to the regulation input terminal ADJ through the third regulation resistor R3; the battery simulation output voltage U3 is generated based on the regulation voltage U1 and the first reference voltage U2;

[0009] The battery simulation output adjusting circuit is used for adjusting the adjusting voltage U1 based on the preset value Uo and the sampling value Ue of the output port Vout.

[0010] The stable power supply is provided by integrating the power supply circuit, the linear voltage stabilizer in the battery simulation output adjusting circuit and the cooperation of the adjusting input end ADJ and the first and second adjusting resistors R1 and R2, a preliminary voltage adjusting mechanism is formed, the battery simulation output adjusting circuit adjusts the adjusting voltage U1 input to the linear voltage stabilizer input end ADJ through the third adjusting resistor R3 based on the preset value Uo and the real-time sampling value Ue of the output port Vout, the closed-loop precise control of the battery simulation output voltage U3 is realized, and the required voltage value can be stably output under various conditions.

[0011] As preferred, the battery simulation output adjusting circuit comprises a control circuit and a pulse modulation generator, the control circuit is used for storing the preset value Uo, receiving the sampling value Ue and outputting the adjusting voltage control signal, and the pulse modulation generator is used for receiving the adjusting voltage control signal to generate the pulse width modulation signal, and the pulse width modulation signal is used for adjusting the adjusting voltage U1.

[0012] The adjusting voltage control signal is used for adjusting the duty cycle of the pulse width modulation signal.

[0013] The control circuit stores the preset voltage value Uo, receives the sampling value Ue from the output port Vout, and outputs the adjusting voltage control signal based on the comparison result of the two. The pulse modulation generator generates the corresponding pulse width modulation signal (i.e. PWM) according to the signal. The pulse width modulation signal is then used to accurately adjust the size of the adjusting voltage U1, so as to realize the closed-loop control of the battery simulation output voltage U3.

[0014] As preferred, the adjusting voltage control signal step-adjusts the current duty cycle of the pulse width modulation signal based on the preset value Uo and the sampling value Ue.

[0015] By introducing the control circuit and the pulse modulation generator, and combining the step-adjusting mechanism based on the difference between the preset value Uo and the sampling value Ue, the adjustable voltage battery output simulation circuit realizes the high-precision closed-loop control of the battery simulation output voltage U3. The control circuit is responsible for comparing the preset value and the sampling value, calculating the error and converting it into the adjusting voltage control signal; the pulse modulation generator adjusts the duty cycle of the pulse width modulation signal in a step-by-step manner according to the adjusting voltage control signal, so as to accurately adjust the adjusting voltage U1, so that the battery simulation output voltage U3 can quickly and stably reach the preset value.

[0016] As preferred, the battery analog output adjusting circuit further comprises a low-pass filter, which is configured to process the pulse width modulation signal to obtain the adjusting voltage U1.

[0017] In each sampling period of the sampling value Ue, the control circuit compares the preset value Uo with the sampling value Ue, and if the preset value Uo is less than the sampling value Ue, the duty cycle corresponding to the adjusting voltage control signal is increased by the preset step value △D, and if the preset value Uo is greater than the sampling value Ue, the duty cycle corresponding to the adjusting voltage control signal is decreased by the preset step value △D.

[0018] Specifically, the preset step value △D can be determined based on the frequency of the clock signal of the pulse modulation generator and the frequency of the output pulse width modulation signal; for example, if the frequency of the clock signal of the pulse modulation generator is 10 MHz and the frequency of the output pulse width modulation signal is 100 Hz, the maximum adjustable fraction of the pulse width modulation signal is 100,000, i.e., the preset step value △D can be N / 100,000 of the current duty cycle (N is a positive integer), and 1s can be adjusted at most 100 times per second.

[0019] As preferred, the battery analog output adjusting circuit further comprises a signal converter, which is configured to sample the output port Vout to obtain the sampling value Ue and send it to the control circuit.

[0020] The signal converter can accurately sample the voltage value of the output port Vout to obtain the sampling value Ue and feed back this information to the control circuit in real time. The control circuit can obtain the current state of the battery analog output voltage in real time and quickly adjust the duty cycle of the pulse width modulation signal accordingly, thereby realizing accurate, fast and stable closed-loop control of the battery analog output voltage U3.

[0021] As preferred, the signal converter adopts MS1100A0.

[0022] By adopting MS1100A0 as the signal converter, the performance of the battery analog output adjusting circuit is significantly improved. MS1100A0 is a high-precision, continuously converting self-calibrating analog-to-digital converter with 16-bit conversion accuracy and built-in reference source, which can provide stable and accurate sampling value Ue to the control circuit. The internal integrated 2.048V reference source makes the differential input range reach ±2.048V, ensuring the accuracy of the sampling. At the same time, MS1100A0 also supports I2C interface, which facilitates data communication with the control circuit.

[0023] As preferred, the linear voltage regulator adopts LM317.

[0024] By using the LM317 as a linear regulator, the battery simulation output regulation circuit offers several advantages. The LM317 is a three-terminal adjustable regulator that provides a stable output voltage range from 1.2V to 37V and has a maximum load current capability of 1.5A. This makes the LM317 ideal for battery simulation output regulation circuits, meeting various application scenarios with varying voltage and current requirements.

[0025] Preferably, the power supply circuit includes an input power supply circuit and an isolated voltage conversion circuit, wherein the input power supply circuit is configured to output a first power supply voltage for supplying power to the isolated voltage conversion circuit based on an external power supply.

[0026] The power supply circuit further includes an input power circuit and an isolated voltage conversion circuit. The input power circuit's primary function is to output a stable first supply voltage based on an external power source. This voltage is used to power the isolated voltage conversion circuit. The isolated voltage conversion circuit converts this first supply voltage into the various voltage levels required within the circuit, while ensuring that these voltages are electrically isolated from the external power source to improve circuit safety and stability.

[0027] Preferably, the isolated voltage conversion circuit is used to convert the first power supply voltage into a second power supply voltage for supplying power to the battery simulation output circuit, and a third power supply voltage for supplying power to the battery simulation output regulation circuit.

[0028] The isolated voltage conversion circuit effectively converts the first supply voltage output by the input power circuit into a second supply voltage suitable for the battery simulation output circuit. It also simultaneously generates a third supply voltage for the battery simulation output regulation circuit. This process ensures that different components within the circuit receive the stable and isolated power supply they need.

[0029] Preferably, the battery simulation output circuit further includes a filter, and the filter is used to filter out high-frequency noise and interference in the third power supply voltage output from the isolation voltage conversion circuit to the linear regulator.

[0030] By adding a filter between the isolated voltage conversion circuit and the linear regulator, the filter filters out high-frequency noise and interference that may exist in the third power supply voltage output from the isolated voltage conversion circuit to the linear regulator, thereby ensuring that the voltage regulation circuit can receive a clean and stable power supply voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural block diagram of a specific embodiment of the voltage-adjustable battery output simulation circuit of the present utility model.

[0032] Figure 2This is a circuit diagram of a specific embodiment of the battery output simulation circuit with adjustable voltage of the utility model.

[0033] Figure 3 for Figure 1 Specific structural diagram of the power supply circuit. DETAILED DESCRIPTION

[0034] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the embodiments. It should be understood that the embodiments are only for explaining the utility model and are not intended to limit the scope of the utility model.

[0035] Example 1

[0036] like Figure 1 The structure block diagram of the battery output simulation circuit with adjustable voltage shown is characterized in that it includes: a battery simulation output circuit, a battery simulation output regulation circuit and a power supply circuit, the power supply circuit is used to supply power to the battery simulation output circuit and the battery simulation output regulation circuit;

[0037] The battery simulation output circuit includes a linear regulator having an input port Vin, an output port Vout, and an adjustment input terminal ADJ. The input port Vin is powered by a power supply circuit, the output port Vout is used to output a battery simulation output voltage U3, and the adjustment input terminal ADJ is used to provide a first reference voltage U2.

[0038] A first regulating resistor R1 is provided between the output port Vout and the regulating input terminal ADJ, and a second regulating resistor R2 is provided between the regulating input terminal ADJ and the ground terminal;

[0039] The battery simulation output regulation circuit is used to generate a regulation voltage U1, and the regulation voltage U1 is connected to the regulation input terminal ADJ through the third regulation resistor R3; the battery simulation output voltage U3 is generated based on the regulation voltage U1 and the first reference voltage U2;

[0040] The battery analog output regulation circuit is used to regulate the regulation voltage U1 based on the preset value Uo and the sampled value Ue of the output port Vout.

[0041] Specifically, if Figures 1-2The block diagram of the battery output simulation circuit with adjustable voltage is shown. The power supply circuit first provides a stable power supply for the battery simulation output circuit and the battery simulation output regulation circuit. The linear regulator in the battery simulation output circuit receives power and receives the first regulation resistor R1, the second regulation resistor R2, and the third regulation resistor R3 through the regulation input terminal ADJ. The first reference voltage U2 and the voltage value of the battery simulation output regulation circuit output U2 jointly determine the output voltage of the linear regulator (i.e., the battery simulation output voltage U3). At the same time, the battery simulation output regulation circuit dynamically adjusts the regulation voltage U1 connected to the linear regulator input terminal ADJ through the third regulation resistor R3 based on the preset value Uo and the real-time sampling value Ue of the output port Vout, achieving closed-loop precise control of the battery simulation output voltage U3, ensuring that it can stably output the required voltage value under various conditions. The specific formula is: + .

[0042] In this embodiment, the battery simulation output regulation circuit includes a control circuit and a pulse modulation generator. The control circuit is used to store a preset value Uo, receive a sampled value Ue, and output a regulated voltage control signal. The pulse modulation generator is used to receive the regulated voltage control signal to generate a pulse width modulation signal. The pulse width modulation signal is used to adjust the regulated voltage U1.

[0043] The regulated voltage control signal is used to regulate the duty cycle of the pulse width modulation signal.

[0044] It can be understood that the pulse modulation generator can also be provided with a corresponding voltage reference circuit to achieve control of the peak voltage of the pulse width modulation signal, and the pulse modulation generator and the voltage reference circuit can together constitute a pulse modulation generating circuit.

[0045] Specifically, the battery simulation output regulation circuit receives a preset value Uo through the control circuit and samples the voltage value Ue of the output port Vout in real time as feedback. The control circuit calculates the regulation voltage control signal based on the difference between the preset value Uo and the sampled value Ue and sends it to the pulse modulation generator. The pulse modulation generator adjusts the duty cycle of the pulse width modulation signal generated internally based on the received regulation voltage control signal, thereby controlling the magnitude of the regulation voltage U1 and ultimately achieving precise regulation of the battery simulation output voltage U3. The battery simulation output regulation circuit in this embodiment achieves precise, fast, and flexible control of the regulation voltage U1 through the design of the control circuit and the pulse modulation generator, thereby ensuring the stability and accuracy of the battery simulation output voltage U3.

[0046] In this embodiment, the voltage control signal is adjusted to perform step-by-step adjustment on the current duty cycle of the pulse width modulation signal based on the preset value Uo and the sampling value Ue.

[0047] Specifically, a method for step-by-step adjustment of the duty cycle of a pulse-width modulated signal is described, comparing a preset value Uo with a real-time sampled value Ue. By calculating the error between the two values, the duty cycle of the pulse-width modulated signal is gradually adjusted accordingly to precisely control the output voltage. Each adjustment step is modified by a small, fixed step size, ensuring system stability and responsiveness. The entire adjustment process is an iterative cycle that continues until the system reaches a stable state or a stop condition is met. This process offers advantages such as rapid response and excellent stability, making it suitable for a variety of applications requiring precise output voltage control.

[0048] In this embodiment, the battery analog output regulation circuit further includes a low-pass filter, which is used to process the pulse width modulation signal to obtain the regulation voltage U1;

[0049] In each sampling cycle of sampling the sampling value Ue, the control circuit compares the preset value Uo and the sampling value Ue. If the preset value Uo is smaller than the sampling value Ue, the duty cycle corresponding to the control signal of the voltage adjustment is increased by the preset step value △D. If the preset value Uo is greater than the sampling value Ue, the duty cycle corresponding to the control signal of the voltage adjustment is decreased by the preset step value △D.

[0050] Specifically, the preset step value △D can be determined based on the frequency of the clock signal of the pulse modulation generator and the frequency of the output pulse width modulation signal; for example, the frequency of the clock signal of the pulse modulation generator is 10 MHz, and the frequency of the output pulse width modulation signal is 100 Hz, then the maximum adjustable number of the pulse width modulation signal is 100,000, that is, the preset step value △D can be N / 100,000 (N is a positive integer) of the current duty cycle, and can be adjusted at most 100 times in 1 second.

[0051] The pulse width modulation signal is smoothed by an integrated low-pass filter to obtain a stable regulated voltage U1. In combination with the control circuit, the preset value Uo and the sampled value Ue are accurately compared in each sampling period. Based on the comparison result, the duty cycle of the pulse width modulation signal is gradually adjusted with a preset step value △D, thereby achieving high-precision, fast and stable closed-loop control of the battery simulated output voltage U3.

[0052] In this embodiment, the battery simulation output regulation circuit further includes a signal converter, which is used to sample the output port Vout to obtain a sampled value Ue and send it to the control circuit.

[0053] Specifically, the signal converter samples the voltage at the output port Vout in real time to obtain a precise sampled value, Ue. This sampled value, Ue, is then quickly transmitted to the control circuit as a feedback signal. Upon receiving this feedback signal, the control circuit gradually adjusts the duty cycle of the pulse-width modulated signal through a series of precise calculations and adjustments based on the deviation between the preset output voltage value, Uo, and the sampled value, Ue. This not only ensures precise control of the output voltage but also significantly improves the response speed and stability of the entire battery simulation output regulation circuit.

[0054] In this embodiment, the signal converter adopts MS1100A0.

[0055] Specifically, this embodiment uses the MS1100A0 as a signal converter. This high-precision, 16-bit analog-to-digital converter (ADC) with a built-in reference is featured. The MS1100A0 features a wide operating voltage range, a built-in 2.048V reference, a programmable gain amplifier (PGA), and an I2C serial communication interface. In the battery simulation output regulation circuit, the MS1100A0 performs high-precision sampling of the output port Vout, obtains the sampled value Ue, and transmits this sampled value to the control circuit via the I2C interface. The control circuit adjusts the duty cycle of the pulse-width modulation signal based on the deviation between the sampled value Ue and the preset output voltage value Uo to achieve precise control of the output voltage. The MS1100A0's high precision, fast response, and low power consumption ensure the stability and responsiveness of the battery simulation output regulation circuit.

[0056] In this embodiment, the linear regulator adopts LM317.

[0057] Specifically, the linear regulator used is LM317, which is an excellent three-terminal adjustable positive voltage regulator (also known as LDO, i.e. low dropout linear regulator). Figure 3 As shown in the figure, the LM317 has three main terminals: Vin (input voltage), Vout (output voltage), and ADJ (adjustment). The LM317 has a wide input voltage range, making it adaptable to a variety of power supply environments. Furthermore, by adjusting the external resistor value at the ADJ terminal, the desired output voltage can be precisely set. Furthermore, the LM317 can provide up to 1.5A of continuous output current. In the battery simulation output regulation circuit, the LM317 receives instructions from the control circuit. The control circuit samples the voltage value at the output port in real time, compares it with the preset output voltage value, and adjusts the external resistor at the LM317's ADJ terminal based on the deviation signal, thereby achieving precise control of the output voltage.

[0058] In this embodiment, the power supply circuit includes an input power supply circuit and an isolated voltage conversion circuit. The input power supply circuit is configured to output a first power supply voltage for supplying power to the isolated voltage conversion circuit based on an external power supply.

[0059] Specifically, if Figure 3 As shown, this embodiment also specifically includes a DC power supply circuit and an isolation voltage conversion circuit. The DC power supply circuit obtains electrical energy from an external power supply and outputs a stable DC voltage (i.e., a first power supply voltage) after processing. The first power supply voltage provides electrical energy for the isolation voltage conversion circuit, ensuring that the isolation voltage conversion circuit can operate stably and reliably.

[0060] In this embodiment, the isolated voltage conversion circuit is used to convert the first power supply voltage into a second power supply voltage for supplying power to the battery simulation output circuit, and a third power supply voltage for supplying power to the battery simulation output regulation circuit.

[0061] Specifically, the isolated voltage conversion circuit in this embodiment can utilize an isolated DC-DC converter (i.e., an isolated DC-DC converter) model URB2405S10WR3. This converter can provide a stable 5V output voltage (i.e., the second supply voltage) and a corresponding current (maximum 2A), ensuring stable operation of the control circuit. It can also output other voltage levels as a third supply voltage as needed to meet the power supply requirements of the voltage regulation circuit. Furthermore, in this embodiment, the second and third supply voltages are designed to share a common ground. This means they share a common reference potential, which not only simplifies circuit design but also helps reduce electrical interference and improve system stability and reliability. By utilizing the isolated DC-DC converter model URB2405S10WR3 as the isolated voltage conversion circuit, this embodiment not only achieves voltage level conversion and electrical isolation, but also improves the overall energy efficiency, safety, and stability of the system.

[0062] In this embodiment, the battery simulation output circuit further includes a filter, which is used to filter out high-frequency noise and interference in the third power supply voltage output from the isolation voltage conversion circuit to the linear regulator.

[0063] Specifically, the main function of the filter is to purify the third power supply voltage transmitted from the isolated voltage conversion circuit to the linear regulator (such as LM317), effectively filtering out high-frequency noise and interference components. Through its specific circuit design and component selection, the filter ensures the smooth passage of low-frequency signals while significantly suppressing the propagation of high-frequency noise, thereby improving the quality of the power supply voltage.

[0064] As described above, this embodiment uses a 16-bit analog-to-digital converter (ADC) model MS1100A0 to acquire analog voltage signals. Because the ADC has 16-bit resolution and the analog battery voltage output range is generally less than 5V, the accuracy of the second analog voltage signal read back by the ADC can reach 0.1mV (5V / 65536 ≈ 0.076mV, a reasonable estimate considering actual circuit errors and calibration). This accuracy far exceeds the battery management system's requirement for 1mV accuracy for the battery simulator, ensuring accurate and reliable voltage acquisition.

[0065] Secondly, for the output and conversion of pulse-width modulated signals, this embodiment utilizes a 16-bit timer and a voltage reference chip, model REF3033AIDBZR. The REF3033AIDBZR provides a stable and precise voltage reference for the pulse-width modulated signal, helping to improve its stability and accuracy. After filtering the pulse-width modulated signal through a low-pass filter, the output of the first analog voltage signal can achieve an accuracy of 0.05mV, which is also far higher than the requirements of the battery management system and provides a solid foundation for subsequent voltage regulation.

[0066] In terms of output current capability, this embodiment utilizes appropriate isolated DC-DC converters (DCDCs) and linear regulators (LDOs) to meet varying voltage and current requirements. Taking the LM317 (1.5A output current) and the URB2305S-10WR3 (5V output voltage, 2A output current) as examples, the simulated battery circuit achieves a final output current capability of 1.5A. This output current capability is sufficient to support the parallel operation of 10 conventional passively balanced battery management system sampling boards (each sampling board provides a 150mA balancing current). Of course, different DCDC and LDO models can be selected to meet varying output requirements, depending on the voltage and current requirements of the actual application.

[0067] In summary, the adjustable voltage simulation battery circuit in this embodiment fully considers the high-precision and high-performance requirements of the battery simulator required by the battery management system in terms of component selection, circuit design, and performance optimization. By employing a high-precision ADC, a stable voltage reference chip, efficient DC-DC and LDO, and precise pulse-width modulation signal control, this embodiment successfully achieves precise regulation and stable control of the output voltage and current, meeting the high-precision requirements of the battery simulator required by the battery management system.

[0068] At the same time, due to the output current capability of the circuit of this embodiment and the electrical isolation set between the circuit input and output, it can meet the testing requirements of multiple battery management circuit boards connected in parallel and the passive balancing circuit turned on at the same time, as well as the requirements of multiple simulated batteries connected in series.

[0069] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application based on one or several embodiments provided in the present application to obtain other embodiments, and these embodiments do not exceed the scope of protection of the present application.

[0070] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The embodiments shown are only part of the embodiments of the present invention, and the actual structure is not limited to them. Therefore, if a person skilled in the art is inspired by the above and designs a structure and embodiment similar to the technical solution without creatively designing it without departing from the inventive purpose of the present invention, it shall fall within the scope of protection of the present invention.

Claims

1. Adjustable voltage battery output simulation circuit, characterized in that: include: A battery simulation output circuit, a battery simulation output regulation circuit and a power supply circuit, wherein the power supply circuit is used to supply power to the battery simulation output circuit and the battery simulation output regulation circuit; The battery simulation output circuit includes a linear regulator having an input port Vin, an output port Vout, and an adjustment input terminal ADJ. The input port Vin is powered by a power supply circuit, the output port Vout is used to output a battery simulation output voltage U3, and the adjustment input terminal ADJ is used to provide a first reference voltage U2. A first regulating resistor R1 is provided between the output port Vout and the regulating input terminal ADJ, and a second regulating resistor R2 is provided between the regulating input terminal ADJ and the ground terminal; The battery simulation output regulation circuit is used to generate a regulation voltage U1, and the regulation voltage U1 is connected to the regulation input terminal ADJ through the third regulation resistor R3; the battery simulation output voltage U3 is generated based on the regulation voltage U1 and the first reference voltage U2; The battery analog output regulation circuit is used to regulate the regulation voltage U1 based on the preset value Uo and the sampled value Ue of the output port Vout.

2. The battery output simulation circuit with adjustable voltage according to claim 1, wherein: The battery simulation output regulation circuit includes a control circuit and a pulse modulation generator. The control circuit is used to store a preset value Uo, receive a sampled value Ue, and output a regulated voltage control signal. The pulse modulation generator is used to receive the regulated voltage control signal to generate a pulse width modulation signal. The pulse width modulation signal is used to adjust the regulated voltage U1. The regulated voltage control signal is used to regulate the duty cycle of the pulse width modulation signal.

3. The battery output simulation circuit with adjustable voltage according to claim 2, wherein: The regulated voltage control signal performs stepwise regulation on the current duty cycle of the pulse width modulation signal based on the preset value Uo and the sampled value Ue.

4. The battery output simulation circuit with adjustable voltage according to claim 3, wherein: The battery analog output regulation circuit further includes a low-pass filter, which is used to process the pulse width modulation signal to obtain the regulation voltage U1; In each sampling cycle of sampling the sampling value Ue, the control circuit compares the preset value Uo and the sampling value Ue. If the preset value Uo is smaller than the sampling value Ue, the duty cycle corresponding to the control signal of the voltage adjustment is increased by the preset step value △D. If the preset value Uo is greater than the sampling value Ue, the duty cycle corresponding to the control signal of the voltage adjustment is decreased by the preset step value △D.

5. The battery output simulation circuit with adjustable voltage according to claim 2, characterized in that: The battery simulation output regulation circuit further includes a signal converter, which is used to sample the output port Vout to obtain a sampled value Ue and send it to the control circuit.

6. The battery output simulation circuit with adjustable voltage according to claim 5, characterized in that: The signal converter used is MS1100A0.

7. The battery output simulation circuit with adjustable voltage according to claim 1, wherein: The linear regulator uses LM317.

8. The battery output simulation circuit with adjustable voltage according to claim 1, wherein: The power supply circuit includes an input power supply circuit and an isolated voltage conversion circuit. The input power supply circuit is used to output a first power supply voltage for supplying power to the isolated voltage conversion circuit based on an external power supply.

9. The battery output simulation circuit with adjustable voltage according to claim 8, characterized in that: The isolated voltage conversion circuit is used to convert the first power supply voltage into a second power supply voltage for supplying power to the battery simulation output circuit and a third power supply voltage for supplying power to the battery simulation output regulation circuit.

10. The battery output simulation circuit with adjustable voltage according to claim 9, characterized in that: The battery simulation output circuit further includes a filter for filtering out high-frequency noise and interference in the third power supply voltage output from the isolation voltage conversion circuit to the linear regulator.

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