Control method of power supply equipment

Abstract

The present application provides a control method for a power supply device, which is used to control M power supply devices connected in series, and the method comprises the following steps. A test signal is sent by a master power supply device. A first delay time for the first power supply device to receive the test signal and a second delay time for the Mth power supply device to receive the test signal are recorded. A maximum delay time is selected from the first delay time and the second delay time. An error time between the first delay time and the second delay time is calculated. When the maximum delay time is the first delay time, the master power supply device waits for the first delay time to execute the first command after receiving the first command, the first power supply device directly executes the first command after receiving the first command, and the Mth power supply device waits for the error time to execute the first command after receiving the first command.

Description

Technical Field

[0001] The present application relates to a control method for a power supply device, and more particularly to a control method that allows all power supply devices to execute commands synchronously. Background Art

[0002] During electrical testing of electronic products, power supplies are used to detect characteristics such as voltage and current. Generally speaking, a single power supply can handle the electrical testing of small electronic products. However, for larger electronic products (such as DC / AC electronic loads, regenerative AC loads, and DC / AC power supplies) or battery devices, the required current may be higher than the current that a single power supply can provide. Therefore, multiple power supplies are often required to test a single battery. In other words, batch electrical testing of large loads requires a very large number of power supplies.

[0003] In one example, multiple power supplies are connected in series in a string, with one power supply configured as a master power supply. Instead of configuring each power supply individually, the master power supply transmits various commands to the other power supplies. For example, the master power supply can command all power supplies to output a specific voltage (e.g., a sine wave voltage). However, because the power supplies in a string receive the command at different times, it is likely that they will not all output the specified voltage at the specified time. Those skilled in the art will understand that unsynchronized sine wave voltages can cause severe waveform distortion and may cause defects in large load tests. In practice, to ensure that all power supplies output a specific voltage simultaneously, multiple external computers may be required for synchronization control, or a high-cost bus may be used to speed up communication. Therefore, the industry needs a new power supply control method that allows all power supplies to execute commands synchronously without requiring additional equipment. Summary of the Invention

[0004] The technical problem to be solved by this application is to provide a control method for power supply devices, in which each power supply device can pre-store a delay time for executing a command. Thus, after receiving an execution command, power supply devices at different locations only need to wait for the delay time, and all power supply devices can execute the command synchronously.

[0005] The present application provides a method for controlling a power supply device, for controlling M power supply devices connected in series, wherein the nth power supply device is a master power supply device. The method comprises the following steps: The master power supply device sends a test signal. The first delay time after the first power supply device receives the test signal and the second delay time after the Mth power supply device receives the test signal are recorded. The maximum delay time is selected from the first delay time and the second delay time. The error time between the first delay time and the second delay time is calculated. When the maximum delay time is the first delay time, the master power supply device waits for the first delay time after receiving a first command before executing the first command. The first power supply device directly executes the first command after receiving the first command. The Mth power supply device waits for the error time after receiving the first command before executing the first command. When the maximum delay time is the second delay time, the master power supply device waits for the second delay time after receiving a second command before executing the second command. The first power supply device waits for the error time after receiving the second command before executing the second command. The Mth power supply device directly executes the second command after receiving the second command. Wherein, M is a natural number greater than 2, and n is a natural number not greater than M.

[0006] In some embodiments, the power supply control method may further include the following steps. When i is not less than 1 and i is less than n, recording a first time difference between the i-th power supply and the first power supply when receiving a test signal. When i is greater than n and i is not greater than M, recording a second time difference between the i-th power supply and the M-th power supply when receiving a test signal. i is a natural number greater than 1 and less than M. When the maximum delay time is the first delay time, and i is not less than 1 and i is less than n, after receiving a first command, the i-th power supply waits for the first time difference to execute the first command. When the maximum delay time is the first delay time, and i is greater than n and i is not greater than M, after receiving the first command, the i-th power supply waits for the second time difference plus the error time to execute the first command. When the maximum delay time is the second delay time, and i is not less than 1 and i is less than n, after receiving a second command, the i-th power supply waits for the first time difference plus the error time to execute the second command. When the maximum delay time is the second delay time, and i is greater than n and i is not greater than M, after receiving the second command, the i-th power supply waits for the second time difference to execute the second command.

[0007] In some embodiments, each power supply device has a first end and a second end, and the first end of the j-th power supply device is connected to the second end of the j-1-th power supply device. The control method further includes the following steps: Each of the M power supply devices executes a check program, the check program being used to identify whether the first end and the second end are connected. When the check program identifies that the first end is connected and the second end is not connected, a first connection status code is set. When the check program identifies that both the first end and the second end are connected, a second connection status code is set. When the check program identifies that the second end is connected and the first end is not connected, a third connection status code is set. Wherein j is a natural number greater than 2 and less than M.

[0008] In some embodiments, the power supply device control method further includes the following steps: determining whether the master power supply device has a first connection status code, a second connection status code, or a third connection status code. When the master power supply device has the first connection status code, only the first terminal of the master power supply device transmits a test signal. When the master power supply device has the second connection status code, both the first and second terminals of the master power supply device transmit a test signal. When the master power supply device has the third connection status code, only the second terminal of the master power supply device transmits a test signal.

[0009] In summary, the power supply control method provided by this application can first establish a master power supply device in a series of power supply devices, and record the delay time for power supply devices preceding and following the master power supply device to execute commands. When the master power supply device issues an execution command, each power supply device only needs to wait for the delay time, and all power supply devices can execute the command synchronously.

[0010] The details of other functions and embodiments of the present application are described below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 is a schematic diagram of the architecture of a power supply system according to an embodiment of the present application;

[0013] Figure 2 is a schematic diagram of the delay time of a power supply system according to an embodiment of the present application;

[0014] Figure 3is a schematic diagram of an execution command of a power supply system according to an embodiment of the present application;

[0015] Figure 4 1 is a flowchart of a method for controlling a power supply device according to an embodiment of the present application.

[0016] Explanation of symbols

[0017] 1: Power supply system

[0018] 10a-10g: Power supply equipment

[0019] 100a~100g: First end

[0020] 102a~102g: Second end

[0021] S20~S25:Step Flow DETAILED DESCRIPTION

[0022] The positional relationships described in the following embodiments include up, down, left, and right. Unless otherwise specified, they are based on the directions of the components shown in the drawings.

[0023] To demonstrate the control method of the power supply device of this application, please refer to Figure 1 , Figure 1 1 is a schematic diagram of the structure of a power supply system according to an embodiment of the present application. The power supply system 1 can apply the control method of the power supply device of the present application. Figure 1 As shown, the power supply device system 1 can have a plurality of power supply devices 10a~10g, each power supply device having a first end and a second end, and the first end of the previous power supply device is connected to the second end of the next power supply device. In practice, the first end of the previous power supply device and the second end of the next power supply device can be connected via a communication cable. Because the plurality of power supply devices 10a~10g are, for example, stacked together, the communication cable does not need to be too long, as long as bidirectional communication is possible. For example, the communication cable can be, for example, an HDMI cable of about 1 meter. In addition, this embodiment does not limit the plurality of power supply devices 10a~10g to only communicating through the communication cable. In practice, each power supply device may also have other ports connected to a common bus.

[0024] Depend on Figure 1As can be seen, multiple power supply devices 10a-10g are connected in series to form a series. In this embodiment, it is assumed that the first power supply device is power supply device 10a, the last power supply device may be power supply device 10g, and the other power supply devices 10b-10f are power supply devices in the middle of the series. Here, since power supply device 10a is the first power supply device, it can be seen that the first end 100a of power supply device 10a is not connected to other power supply devices, and only the second end 102a is connected to the first end 100b of the next power supply device 10b. Conversely, since power supply device 10g is the last power supply device, it can be seen that the second end 102g of power supply device 10g is also not connected to other power supply devices, and only the first end 100g is connected to the second end 102f of the previous power supply device 10f. Taking power supply device 10c as an example, the first end 100c of power supply device 10c can be connected to the second end 102b of power supply device 10b via a communication cable, and the second end 102c of power supply device 10c can also be connected to the first end 100d of power supply device 10d via a communication cable. A series configuration is formed in which the first terminal of the previous power supply device and the second terminal of the next power supply device are connected to each other.

[0025] Although this embodiment Figure 1 Seven power supply devices are shown, but this is not intended to limit the number of power supply devices. Those with ordinary knowledge in the relevant technical field can certainly increase or decrease the power supply devices. In practice, the power supply devices 10a to 10g can be stacked and arranged first, and then connected to each other in sequence using communication cables, so that the physical positions can correspond to the sequence of the power supply devices 10a to 10g. Then, one of the power supply devices 10a to 10g can be set as the master power supply device through an external computer. This embodiment is not limited to this. For example, by pressing a button on one of the power supply devices 10a to 10g, the power supply device whose button is pressed can be set as the master power supply device. For the sake of convenience, this embodiment sets the power supply device 10c as the master power supply device, and Figure 1 As can be seen, power supply devices 10a-10b are arranged before power supply device 10c, while power supply devices 10d-10g are arranged after power supply device 10c. In one example, power supply devices 10a-10g can record their position in the power supply series. For example, power supply device 10a can know that it is the first power supply, so its first end 100a is not connected, only its second end 102a is connected. For another example, power supply device 10g can know that it is the last power supply, so its second end 102g is not connected, only its first end 100g is connected. For another example, power supply device 10c can know that it is the middle power supply in the series, so both its first end 100c and second end 102c are connected to other power supply devices.

[0026] To illustrate the delay time after the power supply devices 10a-10g receive the signal, please refer to Figure 1 and Figure 2 . Figure 2 FIG. 1 is a schematic diagram of the delay time of a power supply system according to an embodiment of the present application. Figure 2 As shown, since power supply 10c is set as the master power supply, it first sends a test signal to determine the delay times of power supplies 10a-10g. Since power supply 10c is the middle power supply in the series, its first terminal 100c and second terminal 102c are both connected to the other power supplies. Therefore, power supply 10c will send the test signal simultaneously from its first terminal 100c and second terminal 102c. Of course, if power supply 10a were the master power supply, only second terminal 102a would send the test signal. Returning to the example where power supply 10c is set as the master power supply, the test signal from first terminal 100c will enter power supply 10b through second terminal 102b. After receiving the test signal, power supply 10b will then transmit the test signal from first terminal 100b to second terminal 102a of power supply 10a. Since the first end 100a of the power supply device 10a is no longer connected to a power supply device, the power supply device 10a knows that it is the end power supply device and thus transmits a feedback signal back to the first end 100b of the power supply device 10b. The feedback signal here can be equal to the test signal, which is not limited in this embodiment.

[0027] Those skilled in the art will understand that, because the signals travel the same transmission path, the time interval between power supply device 10b receiving the feedback signal and the test signal is equal to twice the one-way travel time of the test signal from power supply device 10b to power supply device 10a. In this embodiment, the one-way travel time of the test signal from power supply device 10b to power supply device 10a is referred to as the first time difference Tba. In other words, because power supply device 10b can record the time interval 2Tba between the time it receives the test signal and the time it receives the feedback signal, it can simply divide this time interval 2Tba by two to obtain the first time difference Tba, without requiring a dedicated device for time calculation.

[0028] Similarly, power supply device 10b will also transmit a feedback signal from the second end 102b back to the first end 100c of power supply device 10c. Power supply device 10c can record the time interval 2Tca between receiving the feedback signal from power supply device 10a and sending its own test signal, which is equal to twice the one-way time from power supply device 10c to power supply device 10a. Although the one-way time for the test signal to arrive at power supply device 10a from power supply device 10c is also a time difference, for the sake of convenience, this embodiment refers to the one-way time from the master power supply device (power supply device 10c) to the front-end power supply device (power supply device 10a) as the first delay time Tca. The first delay time Tca can express the time delay for the farthest power supply device connected before power supply device 10c to receive the test signal.

[0029] For the power supply device following power supply device 10c, the test signal emitted from second terminal 102c enters power supply device 10d via first terminal 100d. After receiving the test signal, power supply device 10d then transmits the test signal from second terminal 102d of power supply device 10d to first terminal 100e of power supply device 10e. Similarly, power supply devices 10e and 10f are both serial central power supplies. The test signal can be sequentially transmitted from power supply device 10d, power supply device 10e, and power supply device 10f to power supply device 10g. This transmission process is not detailed in this embodiment. Since second terminal 102g of power supply device 10g is no longer connected to a power supply, power supply device 10g recognizes that it is an endpoint power supply and therefore transmits a feedback signal back to second terminal 102f of power supply device 10f. The feedback signal is then sequentially transmitted to power supply devices 10e and 10d, and finally back to power supply device 10c. Because the signals travel along the same transmission path, the time interval between when power supply device 10f receives the feedback signal and when the test signal receives the test signal is equal to twice the one-way travel time from power supply device 10f to power supply device 10g. In this embodiment, the one-way travel time of the test signal from power supply device 10f to power supply device 10g is referred to as the second time difference Tfg. Similar second time differences include second time differences Teg and Tdg.

[0030] In one example, power supply device 10c can record the time interval 2Tcg between receiving the feedback signal from power supply device 10g and transmitting the test signal itself. This time interval is equal to twice the one-way time between power supply device 10c and power supply device 10g. Although the one-way time between the test signal from power supply device 10c and power supply device 10g is also a time difference, for ease of explanation, this embodiment refers to the one-way time from the master power supply device (power supply device 10c) to the end power supply device (power supply device 10g) as the second delay time Tcg. The second delay time Tcg represents the time delay between the test signal and the farthest power supply device connected after power supply device 10c.

[0031] Then, after the master power supply device (power supply device 10c) receives the first delay time Tca and the second delay time Tcg, it will compare the first delay time Tca and the second delay time Tcg, so that the maximum delay time can be selected. In practice, the first delay time Tca is positively correlated with the number of power supply devices connected before the master power supply device, and the second delay time Tcg is positively correlated with the number of power supply devices connected after the master power supply device. Assume that the same cable is used between two adjacent power supply devices, and the transmission path length is the same. Then in theory, the more power supply devices are connected, the more cable segments will be required, and the longer the total cable length is, the longer the transmission time will be, that is, the delay time will also be greater. Figure 1 In the illustrated example, the power supply system 1 has two power supplies connected before the master power supply, and the power supply system 1 has four power supplies connected after the master power supply. The second delay time Tcg should be the maximum delay time.

[0032] In a physical sense, the first delay time Tca is the time it takes for power supply device 10c to transmit a signal to the power supply device farthest ahead of power supply device 10c, and the second delay time Tcg is the time it takes for power supply device 10c to transmit a signal to the power supply device farthest behind power supply device 10c. The master power supply device (power supply device 10c) also calculates the difference between the first delay time Tca and the second delay time Tcg. In this embodiment, this difference is referred to as the error time Tdiff. In one example, this embodiment refers to the error time Tdiff as a pure numerical value, namely, the absolute value of the difference between the first delay time Tca and the second delay time Tcg. In the above example, since the second delay time Tcg is larger, the second delay time Tcg should be equal to the sum of the first delay time Tca and the error time Tdiff. Conversely, if the first delay time Tca is larger, the first delay time Tca will be equal to the sum of the second delay time Tcg and the error time Tdiff.

[0033] Then, the master power supply device (power supply device 10c) can send the delay time of each power supply device to the corresponding power supply device. For example, because there are many power supplies connected after the master power supply device, when the master power supply device sends a command at the same time, power supply device 10a should receive the command before power supply device 10g. However, if power supply device 10a executes the command directly after receiving it, it will not be able to synchronize with power supply device 10g (because power supply device 10g has not received the command yet). For the convenience of explanation, please refer to Figure 2 and Figure 3 , Figure 3: This is a schematic diagram of an execution command of a power supply device system according to an embodiment of the present application. As shown in the figure, assume that at time T0, power supply device 10c synchronously sends a command from the first end 100c and the second end 102c to power supply device 10b and power supply device 10d. Assuming that the time for signal transmission to any two adjacent power supply devices is the same, it can be seen that power supply device 10b and power supply device 10d will receive the command at time T1 and continue to send it to the next power supply device (power supply device 10a and power supply device 10e). At time T2, power supply device 10a and power supply device 10e should receive the command, but because power supply device 10a is not connected to the next power supply device, only power supply device 10e continues to send the command to power supply device 10f. At time T3, after receiving the command, power supply device 10f continues to send the command to power supply device 10g. Finally, at time T4, power supply device 10g will receive the command.

[0034] Depend on Figure 3 It can be seen that the purpose of this embodiment is to allow all power supply devices 10a-10g to execute the command synchronously. For example, after the last power supply device 10g receives the command at time T4, the power supply devices 10a-10g execute the command synchronously. Therefore, the power supply device that receives the command first needs to wait until time T4. Figure 3 The dashed line portion is shown. Because the first delay time Tca is from time T0 to time T2, and the second delay time Tcg is from time T0 to time T4. For example, for the power supply device preceding power supply device 10c, power supply device 10a waits for the error time Tdiff after receiving the command at time T2 to execute the command, thereby synchronizing the execution of the command at time T4. The command may, for example, be to output a specific voltage. Furthermore, after power supply device 10b receives the command at time T1, it first waits for the first time difference Tba to reach time T2 when power supply device 10a receives the command, and then waits for the error time Tdiff to execute the command, thereby synchronizing the execution of the command at time T4. As power supply device 10c is the master power supply device, it must wait until the last power supply device receives the command before it can synchronize the execution of the command. In this embodiment, because power supply device 10g is the last power supply device to receive the command, the second delay time Tcg is the maximum delay time. Therefore, power supply device 10c must wait for the second delay time Tcg to reach time T4 before executing the command.

[0035] For example, for the power supply following power supply 10c, power supply 10d waits for the second time difference Tdg after receiving the command at time T1 until power supply 10g receives the command at time T4. As one skilled in the art will understand, because time T4 is the time when power supply 10g receives the command, power supply 10d can directly execute the command after waiting for the second time difference Tdg. Similarly, power supply 10e waits for the second time difference Teg after receiving the command at time T2 until power supply 10g receives the command at time T4. And power supply 10f waits for the second time difference Tfg after receiving the command at time T3 until power supply 10g receives the command at time T4. Finally, because power supply 10g is the last power supply to receive the command, power supply 10g directly executes the command after receiving it at time T4. This allows power supplies 10a-10g to execute the command synchronously.

[0036] Of course, the aforementioned embodiment presupposes that each power supply device knows its position in the serial connection. In practice, multiple power supply devices may have just been assembled, and each power supply device is not sure whether there is a power supply device connected at both ends. After the power supply devices 10a~10g are connected, an external computer can issue an instruction to execute a check program to the power supply devices 10a~10g. For example, the computer can issue an instruction to execute the check program through a bus to which the power supply devices 10a~10g are commonly connected. This embodiment is not limited to this. For example, the check program can also be started by individually pressing a button on the power supply devices 10a~10g. In addition, during the check program, each power supply device will check whether its first end and second end are correctly connected.

[0037] For example, after the inspection procedure, the power supply device 10a can know that the first end 100a is not connected and only the second end 102a is connected. At this time, the power supply device 10a can store the inspection result as a connection status code, for example, it can be recorded as 01 (third connection status code). Similarly, the power supply device 10g can know that the second end 102g is not connected and only the first end 100g is connected. At this time, the power supply device 10g can store the inspection result as a connection status code, for example, it can be recorded as 10 (first connection status code). On the other hand, taking the power supply device 10c as an example, the power supply device in the middle of the series, both the first end 100c and the second end 102c are connected. At this time, the power supply device 10c can store the inspection result as a connection status code, for example, it can be recorded as 11 (second connection status code).

[0038] Because both first end 100c and second end 102c of power supply device 10c are connected and have the second connection status code, after power supply device 10c is set as the master power supply device, it can simultaneously send test signals and commands from first end 100c and second end 102c. Furthermore, if power supply device 10a is set as the master power supply device, then because the connection status code of power supply device 10a is 01 (the third connection status code), it indicates that only second end 102a is connected, indicating that power supply device 10a only needs to send test signals and commands from second end 102a. Conversely, if power supply device 10g is set as the master power supply device, then because the connection status code of power supply device 10g is 10 (the first connection status code), it indicates that only first end 100g is connected, indicating that power supply device 10a only needs to send test signals and commands from first end 100g.

[0039] The above uses the power supply system 1 to illustrate and explain the control method of the power supply device provided by this application. In order to allow those with ordinary knowledge in the relevant technical field to better understand that the control method of the power supply device provided by this application has been disclosed in the above description, please refer to Figure 1 and Figure 4 , Figure 4 : This is a flowchart of the steps of a control method for a power supply device according to an embodiment of the present application. As shown in the figure, in step S20, the power supply device 10c will synchronously send a test signal from the first end 100c and the second end 102c. In step S21, the master power supply device (power supply device 10c) can record the first delay time Tca based on the time interval between the feedback signal received from the power supply device 10a and the test signal it sends. In addition, the master power supply device can record the second delay time Tcg based on the time interval between the feedback signal received from the power supply device 10g and the test signal it sends. In step S22, the master power supply device compares the first delay time Tca and the second delay time Tcg and selects the larger one as the maximum delay time. In step S23, the master power supply device calculates the difference between the first delay time Tca and the second delay time Tcg, and the difference is the error time Tdiff.

[0040] In step S24, Figure 1 Contrary to the illustrated example, another possibility is described here, that is, if there are more power devices connected before the master power device, the maximum delay time will be the first delay time. In this case, after the master power device receives the command, it waits for the last power device to receive the command (i.e., waits for the first delay time) before executing the command. Here, after the first power device before the master power device receives the command, the command is directly executed, and after the last power device after the master power device receives the command, it waits for the error time to execute the command. In step S25, Figure 1 In the same illustrated example, if there are more power devices connected after the master power device, the maximum delay time will be the second delay time. In this case, as in the previous embodiment, the master power device (power device 10c) waits for the second delay time Tcg after receiving the command before executing the command. The first power device before the master power device (power device 10a) waits for the error time Tdiff after receiving the command before executing the command. The last power device after the master power device (power device 10g) directly executes the command after receiving the command. The remaining steps of the power device control method have been fully described in the previous embodiment and will not be repeated here.

[0041] In summary, the power supply control method provided by this application can first establish a master power supply device in a series of power supply devices, and record the delay time for power supply devices preceding and following the master power supply device to execute commands. When the master power supply device issues an execution command, each power supply device only needs to wait for the delay time, and all power supply devices can execute the command synchronously.

[0042] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present application, and do not impose any form of limitation on the implementation methods of the technology of the present application. Any person skilled in the art may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present application, but they should still be regarded as technologies or embodiments that are essentially the same as those of the present application.

Claims

1. A method for controlling a power supply device, for controlling M power supply devices connected in series, wherein the nth power supply device is a master power supply device, characterized in that: The control method comprises: The main control power supply device sends a test signal; Recording a first delay time for the first power supply device to receive the test signal and a second delay time for the Mth power supply device to receive the test signal; Selecting a maximum delay time from the first delay time and the second delay time; Calculating an error time between the first delay time and the second delay time; When the maximum delay time is the first delay time, the master power supply device waits for the first delay time after receiving a first command to execute the first command, the first power supply device directly executes the first command after receiving the first command, and the Mth power supply device waits for the error time after receiving the first command to execute the first command; and When the maximum delay time is the second delay time, the master power supply device waits for the second delay time after receiving a second command and then executes the second command; the first power supply device waits for the error time after receiving the second command and then executes the second command; and the Mth power supply device directly executes the second command after receiving the second command; Wherein M is a natural number greater than 2, and n is a natural number not greater than M.

2. The control method of the power supply device according to claim 1, characterized in that: Also includes: When i is not less than 1 and i is less than n, recording a first time difference between the i-th power supply device and the first power supply device receiving the test signal; as well as When i is greater than n and i is not greater than M, recording a second time difference between the i-th power supply device and the M-th power supply device receiving the test signal; Wherein, i is a natural number greater than 1 and less than M.

3. The control method of the power supply device according to claim 2, characterized in that: When the maximum delay time is the first delay time, and i is not less than 1 and i is less than n, the i-th power supply device waits for the first time difference to execute the first command after receiving the first command.

4. The control method of the power supply device according to claim 2, wherein: When the maximum delay time is the first delay time, and i is greater than n and i is not greater than M, the i-th power supply device waits for the second time difference and the error time to execute the first command after receiving the first command.

5. The control method of the power supply device according to claim 2, characterized in that: When the maximum delay time is the second delay time, and i is not less than 1 and i is less than n, after receiving the second command, the i-th power supply device waits for the first time difference and the error time to execute the second command.

6. The control method of the power supply device according to claim 2, characterized in that: When the maximum delay time is the second delay time, and i is greater than n and i is not greater than M, the i-th power supply device waits for the second time difference to execute the second command after receiving the second command.

7. The control method of the power supply device according to claim 1, characterized in that: Each of the power devices has a first end and a second end, the first end of the j-th power device is connected to the second end of the j-1-th power device, and the control method further includes: Each of the M power supply devices executes a check procedure for identifying whether the first end and the second end are connected; When the checking program identifies that the first end is connected and the second end is not connected, setting a first connection status code; When the checking program identifies that the first end and the second end are both connected, setting a second connection status code; as well as When the checking program identifies that the second end is connected and the first end is not connected, setting a third connection status code; Wherein j is a natural number greater than 2 and less than M.

8. The control method of the power supply device according to claim 7, characterized in that: Also includes: Determining whether the master power supply device has the first connection status code, the second connection status code, or the third connection status code; When the master power device has the first connection status code, the test signal is transmitted only by the first end of the master power device; When the master power device has the second connection status code, the first end and the second end of the master power device simultaneously transmit the test signal; as well as When the master power device has the third connection status code, the test signal is transmitted only by the second end of the master power device.

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