Power supply parallel system and power supply control method

Abstract

The invention discloses a power parallel system and a power control method. The power supply parallel system comprises a plurality of voltage conversion circuits. Each of the voltage conversion circuits includes a current sharing terminal, a voltage converter, and a controller. The current sharing ends of the voltage conversion circuits are mutually coupled to form a parallel structure, so that the shared current is transmitted through the parallel structure. The voltage converter converts a first input voltage to a first output voltage based on a first pulse width modulation signal. The controller receives a first output voltage, a first output current and a shared current. The controller executes the following operations: adjusting the first pulse width modulation signal into a second pulse width modulation signal based on the first output current and the shared current; and controlling the voltage converter to adjust the first output voltage to a second output voltage and adjust the first output current to a second output current based on the second pulse width modulation signal. According to the scheme, the impedance of all the voltage conversion circuits in the power supply parallel system can be accurately matched so as to realize a stable and high-precision current sharing effect.

Description

Technical Field

[0001] This case involves an electronic system and a control method. Specifically, this case involves a power supply parallel system and a power supply control method. Background Art

[0002] To ensure the stability and reliability of the power supply system, most existing power supply systems modularize the power supply and connect power modules of a specific specification series in series or in parallel. When multiple power modules are connected in parallel, it is still not possible to fully ensure the stable operation of the entire power supply system. Due to the individual differences of multiple power modules and the impedance differences on the output lines, the currents output by each power module are not equal, and in severe cases, the modules with excessive load may experience overcurrent or overheat protection.

[0003] The existing technologies are mainly divided into active current sharing methods and passive current sharing methods. The active current sharing methods include the output impedance method. The output impedance method mainly achieves current sharing by adjusting the output voltage of the power module. When the current of a single power module increases, its output voltage will correspondingly decrease, thereby reducing the load of a single module and increasing the currents of other modules relatively. This method is simple and easy to implement, but it may cause deviations in the output voltage and affect the quality of the power supply.

[0004] The passive current sharing methods can be implemented as the master-slave setting method, the average current method, and the peak current method. The master-slave setting method mainly controls the current output of other slave power modules by setting one power module as the master power module. The master power module is responsible for monitoring the total current and adjusting the currents of the slave power modules as needed. This method can achieve precise current sharing control, but it has high requirements for the reliability and stability of the master power module. If the master power module fails abnormally, the entire power supply system will not work. The average current method mainly connects all power modules through a current sharing bus to achieve the average distribution of current. Each power module detects its own current and compares it with the average current on the current sharing bus, and then automatically adjusts its output voltage to achieve the purpose of current sharing. The peak current method mainly automatically selects a peak current module, and other power modules are adjusted with the peak current module as a reference. This method is simple and can achieve automatic current sharing, but it may not be stable enough when the load changes greatly.

[0005] Therefore, there are still many defects in the above technologies, and it is necessary for practitioners in this field to develop other suitable power supply parallel systems and power supply control methods. Summary of the Invention

[0006] One aspect of the present case relates to a power supply parallel system. The power supply parallel system includes multiple voltage conversion circuits. Each of the multiple voltage conversion circuits includes a current sharing terminal, a voltage converter, and a controller. The current sharing terminals of each of the multiple voltage conversion circuits are coupled to each other to form a parallel structure for transmitting a shared current through the parallel structure. The voltage converter is used to convert a first input voltage into a first output voltage based on a first pulse width modulation signal and to generate a first output current. The controller is used to receive the first output voltage, the first output current, and the shared current. The controller is used to perform the following operations: adjusting the first pulse width modulation signal to a second pulse width modulation signal based on the first output current and the shared current; and controlling the voltage converter based on the second pulse width modulation signal to adjust the first output voltage to a second output voltage and adjust the first output current to a second output current.

[0007] In some embodiments, the controller is further used to perform the following operations: comparing the first output current and the shared current to generate a current comparison value; filtering the current comparison value to extract a current value; and calculating a virtual impedance value based on the current value and an internal resistance coefficient.

[0008] In some embodiments, the controller further includes a first digital arithmetic circuit. The first digital arithmetic circuit is used to calculate the virtual impedance value based on the current value and the internal resistance coefficient.

[0009] In some embodiments, the controller is further used to perform the following operations: calculating a virtual voltage value based on the virtual impedance value and the first output current; and calculating a voltage calculation value based on a desired voltage and the virtual voltage value.

[0010] In some embodiments, the controller further includes a second digital arithmetic circuit and a third digital arithmetic circuit. The second digital arithmetic circuit calculates the virtual voltage value based on the virtual impedance value and the first output current. The third digital arithmetic circuit calculates the voltage calculation value based on the desired voltage and the virtual voltage value.

[0011] In some embodiments, the second digital arithmetic circuit is a multiplier. The third digital arithmetic circuit is a subtractor.

[0012] In some embodiments, the controller is further used to perform the following operations: comparing the output voltage and the voltage calculation value to generate a comparison signal; and adjusting the first pulse width modulation signal to a second pulse width modulation signal based on the comparison signal.

[0013] In some embodiments, the shared current is the average current of the first output currents of each of the multiple voltage conversion circuits.

[0014] In some embodiments, the voltage converter is a DC-DC converter.

[0015] One aspect of the present case relates to a power supply control method. The power supply control method is applicable to a power supply parallel system. The power supply parallel system includes a plurality of voltage conversion circuits. Each of the plurality of voltage conversion circuits includes a current sharing terminal, a voltage converter, and a controller. The current sharing terminals of each of the plurality of voltage conversion circuits are coupled to each other to form a parallel structure, thereby transmitting a shared current through the parallel structure. The power supply control method includes: converting a first input voltage into a first output voltage by the voltage converter based on a first pulse width modulation signal and using the first input voltage to generate a first output current; adjusting the first pulse width modulation signal to a second pulse width modulation signal by the controller based on the first output current and the shared current; and controlling the voltage converter by the controller based on the second pulse width modulation signal to adjust the first output voltage to a second output voltage and adjust the first output current to a second output current.

[0016] In some embodiments, the step of adjusting the first pulse width modulation signal to a second pulse width modulation signal by the controller based on the first output current and the shared current includes: comparing, by the controller, the first output current and the shared current to generate a current comparison value; filtering, by the controller, the current comparison value to extract a current value; and calculating, by the controller, a virtual impedance value based on the current value and an internal resistance coefficient.

[0017] In some embodiments, the step of adjusting the first pulse width modulation signal to a second pulse width modulation signal by the controller based on the first output current and the shared current further includes: calculating, by the controller, a virtual voltage value based on the virtual impedance value and the first output current; and calculating, by the controller, a voltage calculation value based on a desired voltage and the virtual voltage value.

[0018] In some embodiments, the step of adjusting the first pulse width modulation signal to a second pulse width modulation signal by the controller based on the first output current and the shared current further includes: comparing, by the controller, the output voltage and the voltage calculation value to generate a comparison signal; and adjusting, by the controller, the first pulse width modulation signal to a second pulse width modulation signal based on the comparison signal.

[0019] In some embodiments, the shared current is an average current of the first output currents of each of the plurality of voltage conversion circuits.

[0020] In some embodiments, the voltage converter is a direct current to direct current converter.

[0021] The present case provides a technology of a power supply parallel system and a power supply control method, which can accurately match the impedances of all voltage conversion circuits in the power supply parallel system through the internal resistance coefficient of the controller of the voltage conversion circuit of the power supply parallel system, so as to achieve a stable and high-precision current sharing effect. Brief Description of the Drawings

[0022] The content of this case can be better understood by referring to the embodiments in the following paragraphs and the following diagrams:

[0023] Figure 1 It is a schematic circuit block diagram of a power supply parallel system illustrated according to some embodiments of this case;

[0024] Figure 2 It is a schematic circuit block diagram of a controller of a voltage conversion circuit of a power supply parallel system illustrated according to some embodiments of this case;

[0025] Figure 3 It is a schematic circuit block diagram of a controller of a voltage conversion circuit of a power supply parallel system illustrated according to some embodiments of this case;

[0026] Figure 4 It is a schematic step - flow diagram of a power supply control method illustrated according to some embodiments of this case; and

[0027] Figure 5 It is a schematic diagram of output current and output impedance illustrated according to some embodiments of this case.

[0028] Among them, the description of the reference numerals is as follows:

[0029] 10: Power supply parallel system

[0030] 100A, 100B, 100[n]: Voltage conversion circuit

[0031] 110A, 110B, 110[n]: Voltage converter

[0032] 120A, 120B, 120[n]: Controller

[0033] Vin: Input voltage

[0034] Vo: Load voltage

[0035] Vo1, Vo2, Vo[n], Vo1’, Vo2’: Output voltage

[0036] Io1, Io2, Io[n]: Output current

[0037] R1, R2, R[n]: Resistance

[0038] Ro1, Ro2, Ro[n]: Output resistance

[0039] RL: Load

[0040] I S : Shared current

[0041] PWM1, PWM2, PWM[n]: Pulse width modulation signal

[0042] C1, C2: Comparators

[0043] F1, F2: Filters

[0044] D1, D2, D3, D1’: Digital arithmetic circuits

[0045] DF: Internal resistance coefficient generating circuit

[0046] 121A: Pulse width modulation signal generator

[0047] Vref: Desired voltage

[0048] 20: Power control method

[0049] S1, S2, S3: Steps

[0050] I F : Output current Detailed implementation manners

[0051] The spirit of the present case will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present case, any person with ordinary knowledge in the technical field to which the present case pertains can make changes and modifications based on the technology taught by the present case without departing from the spirit and scope of the present case.

[0052] The terms used in this article are only for describing specific embodiments and are not intended to limit the present case. Singular forms such as "a", "this", "that", "the", and "said", as used in this article, also include plural forms.

[0053] Regarding the terms "comprising", "including", "having", "containing", etc. used in this article, they are all open-ended terms, meaning including but not limited to.

[0054] Regarding the terms used in this article, unless otherwise specified, they generally have their ordinary meanings in the field to which each term pertains, in the context of the present case, and in the specific context. Some terms used to describe the present case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art regarding the description of the present case.

[0055] Figure 1 It is a circuit block diagram of a power supply parallel system 10 shown according to some embodiments of the present case. In some embodiments, please refer to Figure 1, the power supply parallel system 10 includes a plurality of voltage conversion circuits (such as voltage conversion circuit 100A, voltage conversion circuit 100B, and voltage conversion circuit 100[n]). Each of the plurality of voltage conversion circuits includes a power input terminal and a power output terminal. The power input terminals of each of the plurality of voltage conversion circuits are electrically connected to commonly connect to an input voltage source to receive an input voltage Vin. In some embodiments, the input voltage Vin can be implemented as a DC voltage.

[0056] The power output terminal of voltage conversion circuit 100A is used to transfer an output voltage Vo1 and is electrically connected to an output resistor Ro1 and a load RL. The power output terminal of voltage conversion circuit 100B is used to transfer an output voltage Vo2 and is electrically connected to an output resistor Ro2 and a load RL. The power output terminal of voltage conversion circuit 100[n] is used to transfer an output voltage Vo[n] and is electrically connected to an output resistor Ro[n] and a load RL. In other words, the power output terminals of each of the plurality of voltage conversion circuits are also connected to each other to commonly connect to the load RL to form a parallel system. In some embodiments, the output voltage Vo1, the output voltage Vo2, and the output voltage Vo[n] can be implemented as DC voltages.

[0057] Each of the plurality of voltage conversion circuits (such as voltage conversion circuit 100A, voltage conversion circuit 100B, and voltage conversion circuit 100[n]) further includes a current sharing terminal. The current sharing terminals of each of the plurality of voltage conversion circuits are coupled to each other to form a parallel structure to transmit a shared current Is through the parallel structure. The shared current Is is the average current of the output currents (such as output current Io1, voltage conversion circuit output current Io2, and output current Io[n]) of each of the plurality of voltage conversion circuits (such as voltage conversion circuit 100A, voltage conversion circuit 100B, and voltage conversion circuit 100[n]).

[0058] Voltage conversion circuit 100A includes a voltage converter 110A, a controller 120A, and a resistor R1. The voltage converter 110A converts the input voltage Vin into an output voltage Vo1 based on a pulse width modulation signal PWM1 and is used to generate an output current Io1. The controller 120A is used to receive the output voltage Vo1, the output current Io1, and the shared current Is. In some embodiments, the voltage converter 110A can be implemented as a DC-DC converter.

[0059] Please refer to Figure 1, the voltage conversion circuit 100B includes a voltage converter 110B, a controller 120B, and a resistor R2. The voltage converter 110B converts an input voltage Vin into an output voltage Vo2 based on a pulse width modulation signal PWM2 and is used to generate an output current Io2. The controller 120B is used to receive the output voltage Vo2, the output current Io2, and a shared current Is. In some embodiments, the voltage converter 110B can be implemented as a DC-DC converter.

[0060] The voltage conversion circuit 100[n] includes a voltage converter 110[n], a controller 120[n], and a resistor R[n]. The voltage converter 110[n] converts an input voltage Vin into an output voltage Vo[n] based on a pulse width modulation signal PWM[n] and is used to generate an output current Io[n]. The controller 120[n] is used to receive the output voltage Vo[n], the output current Io[n], and a shared current Is. In some embodiments, the voltage converter 110[n] can be implemented as a DC-DC converter. It should be noted that the number of voltage conversion circuits can be designed according to actual needs and is not limited to the embodiments of this case.

[0061] Figure 2 As shown in some embodiments of this case Figure 1 is a schematic circuit diagram of the controller 120A of the voltage conversion circuit 100A of the power supply parallel system 10. Please refer to Figure 2 , the controller 120A includes a comparator C1, a filter F1, an internal resistance coefficient generation circuit DF, a digital arithmetic circuit D1, a digital arithmetic circuit D2, a digital arithmetic circuit D3, a comparator C2, a filter F2, and a pulse width modulation signal generator 121A.

[0062] The comparator C1 is used to receive the output current Io1 and the shared current Is. The filter F1 is coupled to the comparator C1. In some embodiments, the filter F1 can be implemented as an integrator to simply filter the value calculated by the comparator C1. In some embodiments, the filter F1 can be implemented as a proportional-integral-derivative controller (PID controller) to filter and compensate the value calculated by the comparator C1. The PID controller is a common feedback loop element in industrial control applications.

[0063] The digital arithmetic circuit D1 is coupled to the internal resistance coefficient generation circuit DF and the filter F1. The digital arithmetic circuit D2 is coupled to the digital arithmetic circuit D1. The digital arithmetic circuit D3 is coupled to the digital arithmetic circuit D2. In some embodiments, the digital arithmetic circuits D1 and D2 can be implemented as multipliers. The digital arithmetic circuit D3 can be implemented as a subtractor.

[0064] Comparator C2 is coupled to digital arithmetic circuit D3 and filter F2, and is configured to receive output voltage Vo1. Pulse width modulation signal generator 121A is coupled to filter F2, and is configured to output pulse width modulation signal PWM1.

[0065] It should be noted that, please refer to Figure 1 and Figure 2 , the internal circuit structures of controller 120B of voltage conversion circuit 100B and controller 120[n] of voltage conversion circuit 100[n] are similar to the internal circuit structure of controller 120A of voltage conversion circuit 100A, and will not be elaborated here.

[0066] Figure 3 It is a schematic circuit block diagram of controller 120A of voltage conversion circuit 100A of power supply parallel system 10 shown according to some embodiments of this case. Please refer to Figure 1 , controller 120A includes comparator C1, filter F1, internal resistance coefficient generation circuit DF, digital arithmetic circuit D1’, digital arithmetic circuit D2, digital arithmetic circuit D3, comparator C2, filter F2 and pulse width modulation signal generator 121A. The connection manners and operations of comparator C1, filter F1, internal resistance coefficient generation circuit DF, digital arithmetic circuit D1’, digital arithmetic circuit D2, digital arithmetic circuit D3, comparator C2, filter F2 and pulse width modulation signal generator 121A are respectively similar to Figure 3 the corresponding elements in controller 120A of Figure 2 . For the sake of simplicity, only the differences will be described below.

[0067] Compared with Figure 2 the embodiments of Figure 2 and Figure 3 , the difference is that digital arithmetic circuit D1’ can be implemented as a subtractor or an adder.

[0068] Figures 2 to 3 The architectures of the embodiments of

[0069] are only examples, used to illustrate some possible ways of integrating and separately setting each functional block in the foregoing embodiments, and this case is not limited thereto. Those with ordinary knowledge in the art should understand that various modifications and applications can be made without departing from the necessary features of the aspects. For example, the elements described in detail in the above aspects can be modified. In addition, the differences related to these modifications and applications should be interpreted as being covered by the scope of the present disclosure defined by the following claims.

[0069] In some embodiments, Figure 2 controller 120A of Figure 3The internal components of the controller 120A (such as comparator C1, filter F1, internal resistance coefficient generation circuit DF, digital operation circuit D1, digital operation circuit D2, digital operation circuit D3, comparator C2, filter F2, and pulse width modulation signal generator 121A) can be implemented as a collection of multiple electronic entity components (such as multiple transistors and capacitors). In some embodiments, Figure 2 the controller 120A and Figure 3 the internal components of the controller 120A (such as comparator C1, filter F1, internal resistance coefficient generation circuit DF, digital operation circuit D1, digital operation circuit D2, digital operation circuit D3, comparator C2, filter F2, and pulse width modulation signal generator 121A) can perform digital operations by executing a program.

[0070] To facilitate the understanding of the operation of the controller 120A of the voltage conversion circuit 100A in the power supply parallel system 10 of this case, please refer to Figure 1 , Figure 2 and Figure 4 . Figure 4 is a schematic flowchart of the steps of the power supply control method 20 illustrated according to some embodiments of this case. The power supply control method 20 includes steps S1 to S3. The power supply control method 20 can be executed by Figure 1 the power supply parallel system 10.

[0071] In step S1, please refer to Figure 1 , Figure 2 and Figure 4 . Through the voltage converter 110A, the input voltage Vin is converted into the output voltage Vo1 based on the pulse width modulation signal PWM1 and used to generate the output current Io1. Through the voltage converter 110B, the input voltage Vin is converted into the output voltage Vo2 based on the pulse width modulation signal PWM2 and used to generate the output current Io2.

[0072] In step S2, please refer to Figure 1 , Figure 2 and Figure 4 . Through the controller 120A, based on the output current Io1 and the shared current Is, the pulse width modulation signal PWM1 is adjusted to a new pulse width modulation signal (not shown in the figure). Since the internal circuit structures and operations of the controller 120B of the voltage conversion circuit 100B and the controller 120[n] of the voltage conversion circuit 100[n] are similar to those of the controller 120A of the voltage conversion circuit 100A, for the sake of brevity, they will not be elaborated here.

[0073] In some embodiments, a comparator C1 of the controller 120A is configured to compare an output current Io1 and a shared current Is to generate a current comparison value. A filter F1 of the controller 120A is configured to filter the current comparison value to extract a current value. A digital arithmetic circuit D1 of the controller 120A is configured to calculate a virtual impedance value based on the current value and an internal resistance coefficient provided by a circuit DF. A digital arithmetic circuit D2 of the controller 120A is configured to calculate a virtual voltage value based on the virtual impedance value and the output current Io1. A digital arithmetic circuit D3 of the controller 120A is configured to calculate a voltage calculation value based on a desired voltage Vref and the virtual voltage value.

[0074] Next, please refer to Figure 1 , Figure 2 and Figure 4 . A comparator C2 of the controller 120A is configured to compare an output voltage Vo1 and the voltage calculation value to generate a comparison signal. A filter F2 of the controller 120A is configured to filter the comparison signal. A pulse width modulation signal generator 121A of the controller 120A is configured to adjust a pulse width modulation signal PWM1 to a new pulse width modulation signal (not shown in the figure) based on the filtered comparison signal.

[0075] In step S3, please refer to Figure 1 , Figure 2 and Figure 4 . The controller 120A controls the voltage converter 110A based on the new pulse width modulation signal to adjust the output voltage Vo1 to an output voltage Vo1' and adjust the output current Io1 to an output current I F . The controller 120B controls the voltage converter 110B based on the new pulse width modulation signal to adjust the output voltage Vo2 to an output voltage Vo2' and adjust the output current Io2 to an output current I F .

[0076] When the digital arithmetic circuit D1 of the controller 120A calculates the virtual impedance value based on the internal resistance coefficient, the equivalent impedance value of the voltage conversion circuit 100A and the output resistance Ro1 has changed, causing the output voltage Vo1 of the voltage conversion circuit 100A to gradually decrease until the equivalent impedance values of other voltage conversion circuits and output resistances (such as the voltage conversion circuit 100B and the output resistance Ro2) are the same.

[0077] That is to say, each of the multiple voltage conversion circuits (such as voltage conversion circuit 100A and voltage conversion circuit 100B) continuously adjusts the equivalent impedance value through the feedback output voltage (such as output voltage Vo1 and output voltage Vo2), output current (such as output current Io1 and output current Io2), and shared current Is until the equivalent impedance values of all the voltage conversion circuits and the output resistors (such as voltage conversion circuit 100A and output resistor Ro1, and voltage conversion circuit 100B and output resistor Ro2) are the same.

[0078] At this time, the output voltage Vo1 of voltage conversion circuit 100A and the output voltage Vo2 of voltage conversion circuit 100B will decrease until they are close to the same to achieve the effect of voltage equalization. At the same time, the output current Io1 of voltage conversion circuit 100A and the output current Io2 of voltage conversion circuit 100B also decrease until they are close to the same.

[0079] Figure 5 It is a schematic diagram of output current and output impedance shown according to some embodiments of this case. As Figure 5 shown, the vertical axis represents the output voltage V (unit: volt), and the horizontal axis represents the output current I (unit: ampere). Voltage conversion circuit 100A and voltage conversion circuit 100B respectively have different output voltages (such as Figure 5 the output voltages Vo1 and Vo2 shown) and different output currents (such as Figure 5 the output currents Io1 and Io2 shown). When the equivalent impedance values of all the voltage conversion circuits are the same and the power supply is stable, the output voltage of voltage conversion circuit 100A is output voltage Vo1', and the output voltage of voltage conversion circuit 100B is output voltage Vo2'. The output voltages of the two are similar, which helps to achieve voltage equalization. At this time, the output currents of voltage conversion circuit 100A and voltage conversion circuit 100B are current I F , and the output currents of the two are similar, which helps to achieve current sharing.

[0080] According to the foregoing embodiments, this case provides a technology for a power supply parallel system and a power supply control method, which can accurately match the impedances of all voltage conversion circuits in the power supply parallel system through the internal resistance coefficient of the controller of the voltage conversion circuit of the power supply parallel system, so as to achieve a stable and high-precision current sharing effect.

[0081] Although this case is disclosed in detail as above, this case does not exclude other feasible embodiments. Therefore, the protection scope of this case shall be subject to what is defined by the appended claims, rather than being limited by the foregoing embodiments.

[0082] Those skilled in the art can make various modifications and refinements to this case without departing from the spirit and scope of this case. Based on the foregoing embodiments, all modifications and refinements made to this case are also covered by the protection scope of this case.

Claims

1. A power supply parallel system, characterized in that Comprising: A plurality of voltage conversion circuits, each of which comprises: A current sharing terminal, where the current sharing terminals of each of the plurality of voltage conversion circuits are coupled to each other to form a parallel structure for transmitting a shared current through the parallel structure; A voltage converter for converting a first input voltage into a first output voltage based on a first pulse width modulation signal and for generating a first output current; And A controller for receiving the first output voltage, the first output current, and the shared current, where the controller is configured to perform the following operations: Adjust the first pulse width modulation signal to a second pulse width modulation signal based on the first output current and the shared current; and Control the voltage converter based on the second pulse width modulation signal to adjust the first output voltage to a second output voltage and adjust the first output current to a second output current.

2. The power supply parallel system according to claim 1, wherein The controller is further configured to perform the following operations: Compare the first output current and the shared current to generate a current comparison value; Filter the current comparison value to extract a current value; and Calculate a virtual impedance value based on the current value and an internal resistance coefficient.

3. The power supply parallel system according to claim 2, wherein The controller further includes a first digital arithmetic circuit, where the first digital arithmetic circuit is used to calculate the virtual impedance value based on the current value and the internal resistance coefficient.

4. The power supply parallel system according to claim 2, characterized in that, The controller is further configured to perform the following operations: Calculate a virtual voltage value based on the virtual impedance value and the first output current; and Calculate a voltage calculation value based on a desired voltage and the virtual voltage value.

5. The power supply parallel system according to claim 4, wherein The controller further includes a second digital arithmetic circuit and a third digital arithmetic circuit, where the second digital arithmetic circuit calculates the virtual voltage value based on the virtual impedance value and the first output current, and the third digital arithmetic circuit calculates the voltage calculation value based on the desired voltage and the virtual voltage value.

6. The power supply parallel system according to claim 5, wherein The second digital arithmetic circuit is a multiplier, and the third digital arithmetic circuit is a subtractor.

7. The power supply parallel system according to claim 4, wherein The controller is further configured to perform the following operations: Compare the first output voltage and the voltage calculation value to generate a comparison signal; and Adjust the first pulse width modulation signal to the second pulse width modulation signal based on the comparison signal.

8. The power supply parallel system according to claim 1, wherein, The shared current is an average current of the first output currents of each of the plurality of voltage conversion circuits.

9. The power supply parallel system according to claim 1, wherein The voltage converter is a DC-DC converter.

10. A power control method, characterized in that Applicable to a power supply parallel system, where the power supply parallel system includes a plurality of voltage conversion circuits, each of which includes a current sharing terminal, a voltage converter, and a controller, where the current sharing terminals of each of the plurality of voltage conversion circuits are coupled to each other to form a parallel structure for transmitting a shared current through the parallel structure, and where the power supply control method includes: Convert a first input voltage into a first output voltage by the voltage converter based on a first pulse width modulation signal and generate a first output current; Adjust the first pulse width modulation signal to a second pulse width modulation signal by the controller based on the first output current and the shared current; And Based on the second pulse width modulation signal, the controller controls the voltage converter to adjust the first output voltage to a second output voltage and adjust the first output current to a second output current.

11. The power control method according to claim 10, characterized in that, The steps of adjusting the first pulse width modulation signal to the second pulse width modulation signal by the controller based on the first output current and the shared current include: The controller compares the first output current and the shared current to generate a current comparison value; The controller filters the current comparison value to extract a current value; and The controller calculates a virtual impedance value based on the current value and an internal resistance coefficient.

12. The power control method according to claim 11, wherein The steps of adjusting the first pulse width modulation signal to the second pulse width modulation signal by the controller based on the first output current and the shared current further include: The controller calculates a virtual voltage value based on the virtual impedance value and the first output current; and The controller calculates a voltage calculation value based on a desired voltage and the virtual voltage value.

13. The power control method according to claim 12, wherein The steps of adjusting the first pulse width modulation signal to the second pulse width modulation signal by the controller based on the first output current and the shared current further include: The controller compares the first output voltage and the voltage calculation value to generate a comparison signal; and The controller adjusts the first pulse width modulation signal to the second pulse width modulation signal based on the comparison signal.

14. The power control method according to claim 10, wherein, The shared current is an average current of the first output currents of the plurality of voltage conversion circuits.

15. The power control method according to claim 10, characterized in that, The voltage converter is a direct current to direct current converter.

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