Power supply power control method and device

Abstract

The invention belongs to the technical field of power supply control, and particularly relates to a power supply power control method and device, and the method comprises the steps: S10, obtaining a current signal outputted by a power supply in real time; and S20, controlling the power supply to enter different driving modes according to the current signal. The different driving modes comprise a constant-voltage driving mode, a constant-voltage constant-current transition driving mode and a constant-current driving mode. In the constant-voltage and constant-current transition driving mode, an output current signal and an output voltage signal change along with the size of the load, and the current signal and the voltage signal are in negative correlation. By adding the constant-voltage and constant-current transition driving mode, the problem that in the prior art, the output capacity of a power supply is reduced due to the fact that a constant-voltage driving mode is directly switched to a constant-current driving mode, voltage is reduced and a current signal is not changed is solved.

Description

Technical Field

[0001] The present application belongs to the field of power supply control technology, and specifically relates to a power supply power control method and device. Background Art

[0002] In order to improve the reliability of the voltage source, it is usually done by performing constant voltage control under light load conditions. Figure 1 Once the current limit (e.g., the first preset current signal I1) is exceeded, either overcurrent protection is activated, halting output, or constant current control is implemented. If overcurrent protection is activated, hiccup output control is implemented, testing output at intervals. If the load is still experiencing an overcurrent or short circuit, output is halted again, potentially causing frequent load startups and system instability. If constant current control is activated, the power supply's output capacity is reduced when the load current is at the constant voltage or constant current switching boundary. Summary of the Invention

[0003] In view of this, the present application provides a power supply power control method and device, which solves the problem in the prior art that the constant voltage drive mode is directly switched to the constant current drive mode, the voltage is reduced, and the current signal remains unchanged, resulting in a reduction in the power supply output capacity.

[0004] A first aspect of the present application provides a power supply control method, the power supply control method comprising: S10: Acquire the current signal output by the power supply in real time.

[0005] S20: Controlling the power supply to enter different drive modes based on the current signal. The different drive modes include a constant voltage drive mode, a constant voltage constant current transition drive mode, and a constant current drive mode. In the constant voltage constant current transition drive mode, the output current and voltage signals vary with the load, and the current and voltage signals are negatively correlated.

[0006] In a specific embodiment of the present application, the above step S20 includes: S21: When the current signal is less than the first preset current signal, the power supply is controlled to enter a constant voltage driving mode.

[0007] S22: When the current signal is greater than the first preset current signal and less than the second preset current signal, the power supply is controlled to enter a constant voltage and constant current transition driving mode.

[0008] S23: When the current signal is greater than or equal to the second preset current signal, the power supply is controlled to enter a constant current driving mode.

[0009] In a specific embodiment of the present application, the above step S21 includes: S211 : When the current signal is less than the first preset current signal, output a current deviation value according to the current signal and the first preset current signal.

[0010] S212: Perform calculation processing according to the current deviation value and output a calculation processing control signal.

[0011] S213: Outputting a function operation control signal according to the operation processing control signal.

[0012] S214: Acquire real-time voltage signal.

[0013] S215: Based on the function operation control signal, output a voltage control signal to the power supply according to the real-time voltage signal and the first preset voltage signal to put the power supply into a constant voltage driving mode. The first preset current signal is the maximum current signal in the constant voltage driving mode corresponding to the first preset voltage signal.

[0014] In a specific embodiment of the present application, the above step S22 includes: S221 : When the current signal is greater than the first preset current signal and less than the second preset current signal, output a current deviation value according to the current signal and the first preset current signal.

[0015] S222: Perform calculation processing according to the current deviation value and output a calculation processing control signal.

[0016] S223: Outputting a function operation control signal based on the operation processing control signal, and performing a function operation according to the current deviation value to output a function operation signal.

[0017] S224: Acquire real-time voltage signal.

[0018] S225: Outputting a voltage deviation signal according to the function operation signal and the first preset voltage signal, and outputting a current control signal to the power supply based on the voltage deviation signal and the real-time voltage signal to enable the power supply to enter a constant voltage and constant current transition driving mode.

[0019] In a specific embodiment of the present application, the above step S23 includes: S231: When the current signal is greater than or equal to the second preset current signal, output a current deviation value according to the current signal and the second preset current signal.

[0020] S232: Outputting a current control signal to the power supply according to the current deviation value to enable the power supply to enter a constant current driving mode.

[0021] A second aspect of the present application provides a power supply control device, which includes an acquisition module and a drive mode module. The acquisition module is used to acquire the current signal output by the power supply in real time. The drive mode module is used to control the power supply to enter different drive modes based on the current signal. The different drive modes include a constant voltage drive mode, a constant voltage constant current transition drive mode, and a constant current drive mode. In the constant voltage constant current transition drive mode, the output current signal and voltage signal both vary with the load size, and the current signal and voltage signal are negatively correlated.

[0022] In a specific embodiment of the present application, the drive mode module includes a constant voltage drive mode unit, a transition drive mode unit, and a constant current drive mode unit. The constant voltage drive mode unit is configured to control the power supply to enter a constant voltage drive mode when the current signal is less than a first preset current signal. The transition drive mode unit is configured to control the power supply to enter a constant voltage constant current transition drive mode when the current signal is greater than the first preset current signal and less than a second preset current signal. The constant current drive mode unit is configured to control the power supply to enter a constant current drive mode when the current signal is greater than or equal to the second preset current signal.

[0023] In a specific embodiment of the present application, the constant voltage drive mode unit includes a first deviation value operation subunit, a first operation processing subunit, a first function operation subunit, a first voltage acquisition subunit and a first voltage control signal output subunit. The first deviation value operation subunit is used to output a current deviation value according to the current signal and the first preset current signal when the current signal is less than the first preset current signal. The first operation processing subunit is used to perform operation processing according to the current deviation value and output an operation processing control signal. The first function operation subunit is used to output a function operation control signal according to the operation processing control signal. The first voltage acquisition subunit is used to obtain a real-time voltage signal. The first voltage control signal output subunit is used to output a voltage control signal to the power supply based on the real-time voltage signal and the first preset voltage signal based on the function operation control signal to enable the power supply to enter the constant voltage drive mode. The first preset current signal is the maximum current signal in the constant voltage drive mode corresponding to the first preset voltage signal.

[0024] In a specific embodiment of the present application, the transition drive mode unit includes a second deviation value operation subunit, a second operation processing subunit, a second function operation subunit, a second voltage acquisition subunit, and a second voltage control signal output subunit. The second deviation value operation subunit is used to output a current deviation value according to the current signal and the first preset current signal when the current signal is greater than the first preset current signal and less than the second preset current signal. The second operation processing subunit is used to perform operation processing according to the current deviation value and output an operation processing control signal. The second function operation subunit is used to output a function operation control signal based on the operation processing control signal, and perform function operation according to the current deviation value to output a function operation signal. The second voltage acquisition subunit is used to obtain a real-time voltage signal. The second voltage control signal output subunit is used to output a voltage deviation signal according to the function operation signal and the first preset voltage signal, and output a current control signal to the power supply based on the voltage deviation signal and the real-time voltage signal to enable the power supply to enter the constant voltage and constant current transition drive mode.

[0025] In a specific embodiment of the present application, the first deviation operator and the second deviation operator are both first difference operators; the first operation processing subunit and the second operation processing subunit are both positive limiters; the first function operator and the second function operator are both function operators; the first voltage control signal output subunit is a second difference operator and a first PID operator. The second voltage control signal output subunit is also a second difference operator and a first PID operator. The first input of the first difference operator receives a first preset current signal; the second input of the first difference operator receives a real-time current signal; the output of the first difference operator is electrically connected to the input of the positive limiter; the output of the positive limiter is electrically connected to the input of the function operator; the voltage output of the function operator is electrically connected to the first input of the second difference operator; the second input of the second difference operator receives a first preset voltage signal; the third input of the second difference operator receives a real-time voltage signal; the output of the second difference operator is electrically connected to the input of the first PID operator; and the output of the first PID operator outputs a voltage control signal.

[0026] In one embodiment of the present application, the constant current drive mode unit includes a third difference operator and a second PID operator. A first input of the third difference operator receives a second preset current signal; a second input of the third difference operator receives a real-time current signal. An output of the third difference operator is electrically connected to an input of the second PID operator; and an output of the second PID operator outputs a current control signal.

[0027] In one embodiment of the present application, the power control device further includes a multiplexer. The output of the third difference operator is electrically connected to the input of the second PID operator; the output of the second PID operator is electrically connected to the first input of the multiplexer; and the second input of the multiplexer is electrically connected to the output of the transition drive mode unit.

[0028] The beneficial effects of the technical solution of the present application are: by obtaining the current signal output by the power supply in real time; and controlling the power supply to enter different driving modes according to the current signal, the different driving modes include constant voltage driving mode, constant voltage constant current transition driving mode and constant current driving mode. In this way, by refining each driving mode, it is ensured that the power supply is controlled to enter different driving modes according to the size of the current signal output by the power supply, and a constant voltage constant current transition driving mode is added when switching from the constant voltage driving mode to the constant current driving mode. Since the current signal increases when the voltage decreases in the constant voltage constant current transition driving mode, the problem of no constant voltage constant current transition driving mode in the prior art is avoided, and the constant voltage driving mode is directly switched to the constant current driving mode, the voltage is reduced, and the current signal remains unchanged, resulting in a reduction in the power supply output capacity, thereby improving the power supply output capacity when switching between constant voltage and constant current. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The figure shows the volt-ampere characteristic diagram of the power supply control method in the prior art.

[0030] Figure 2 FIG2 is a flow chart of a power supply control method provided in an embodiment of the present application.

[0031] Figure 3 The figure shows a volt-ampere characteristic diagram of a power supply output when a power control device provided by an embodiment of the present application drives a power supply.

[0032] Figure 4 Shown is a volt-ampere characteristic diagram of a power supply output when a power control device provided by another embodiment of the present application drives a power supply.

[0033] Figure 5 FIG2 is a flow chart of a power supply control method provided in another embodiment of the present application.

[0034] Figure 6 FIG2 is a schematic structural diagram of a power supply control device provided in one embodiment of the present application.

[0035] Figure 7 Shown is a structural schematic diagram of a power supply control device provided in another embodiment of the present application.

[0036] Figure 8 Shown is a structural schematic diagram of a power supply control device provided in yet another embodiment of the present application.

[0037] Figure 9 FIG2 is a schematic diagram of a circuit structure of a power supply control device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0039] At least one embodiment of the present application provides a power supply control method, referring to Figure 2 The power control method includes the following steps S10 and S20.

[0040] S10: Acquire the current signal output by the power supply in real time.

[0041] It should be noted that the current signal output by the power supply is the current signal output in real time when the power supply drives the load; when the power supply drives different loads, the current signal output by the power supply in real time is different; generally, when the power supply drives a heavy load, the current signal output by the power supply in real time is smaller; when the power supply drives a light load, the current signal output by the power supply in real time is larger; the embodiments of the present application are applicable to different load change scenarios.

[0042] In some embodiments, a current sensor may be used to obtain a current signal output by the power supply in real time.

[0043] S20: Controlling the power supply to enter different drive modes based on the current signal. The different drive modes include a constant voltage drive mode, a constant voltage constant current transition drive mode, and a constant current drive mode. In the constant voltage constant current transition drive mode, the output current and voltage signals vary with the load, and the current and voltage signals are negatively correlated.

[0044] Reference Figure 3 and Figure 4 The constant voltage drive mode 01 can be understood as a drive mode in which the output voltage remains unchanged and the current signal changes with the load size; the constant current drive mode 03 can be understood as a drive mode in which the output current remains unchanged and the voltage signal changes with the load size; the constant voltage and constant current transition drive mode 02 is the transition stage from the constant voltage drive mode 01 to the constant current drive mode 03, and the output current signal and voltage signal both change with the load size.

[0045] According to the technical solution provided in the embodiment of the present application, the current signal output by the power supply is obtained in real time; and the power supply is controlled to enter different driving modes according to the current signal. The different driving modes include constant voltage driving mode, constant voltage constant current transition driving mode and constant current driving mode. In this way, by refining each driving mode, it is ensured that the power supply is controlled to enter different driving modes according to the size of the current signal output by the power supply, and a constant voltage constant current transition driving mode is added when switching from the constant voltage driving mode to the constant current driving mode. Since the current signal increases when the voltage decreases in the constant voltage constant current transition driving mode, the problem of no constant voltage constant current transition driving mode in the prior art is avoided, and the constant voltage driving mode is directly switched to the constant current driving mode, the voltage is reduced, and the current signal remains unchanged, resulting in a reduction in the power supply output capacity, thereby improving the power supply output capacity when switching between constant voltage and constant current.

[0046] In at least one embodiment of the present application, reference Figure 5 , the above step S20 includes the following steps S21 to S23.

[0047] S21: When the current signal is less than the first preset current signal, the power supply is controlled to enter a constant voltage driving mode.

[0048] S22: When the current signal is greater than the first preset current signal and less than the second preset current signal, the power supply is controlled to enter a constant voltage and constant current transition driving mode.

[0049] S23: When the current signal is greater than or equal to the second preset current signal, the power supply is controlled to enter a constant current driving mode.

[0050] In at least one embodiment of the present application, the above-mentioned step S21 includes the following steps S211 to S215.

[0051] S211 : When the current signal is less than the first preset current signal, output a current deviation value according to the current signal and the first preset current signal.

[0052] Reference Figure 3 and Figure 4 The first preset current signal I1 is the maximum current signal in the constant voltage drive mode of the power supply. The first preset current signal I1 is determined by the characteristics of the power supply itself and is not specifically limited in the embodiments of the present application. The first preset voltage signal Vs is the constant voltage signal in the constant voltage drive mode of the power supply. The first preset voltage signal Vs is also determined by the characteristics of the power supply itself and is not specifically limited in the embodiments of the present application. For example, a typical power supply nameplate indicates (20V, 5A), where the first preset voltage signal Vs is 20V and the first preset current signal I1 is 5A.

[0053] In the embodiment of the present application, when the current signal is less than the first preset current signal I1 , a current deviation value is output according to the current signal and the first preset current signal I1 , and the current deviation value is a negative value.

[0054] S212: Perform calculation processing according to the current deviation value and output a calculation processing control signal.

[0055] The operation processing includes positive and negative operation processing. In the embodiment of the present application, when the current deviation value is negative, the operation processing control signal is at a low level.

[0056] S213: Outputting a function operation control signal according to the operation processing control signal.

[0057] In the embodiment of the present application, when the operation processing control signal is at a low level, the function operation control signal is at a low level.

[0058] S214: Acquire real-time voltage signal.

[0059] The real-time voltage signal is any voltage signal when the load changes, which can be less than the first preset voltage signal Vs or greater than the first preset voltage signal Vs; it depends on whether the load suddenly increases or decreases under the current real-time current signal; for example, if the load suddenly increases under the current real-time current signal, since the real-time current signal does not respond, the real-time voltage signal is less than the first preset voltage signal Vs; otherwise, the real-time voltage signal is greater than the first preset voltage signal Vs.

[0060] S215: Based on the function operation control signal, output a voltage control signal to the power supply according to the real-time voltage signal and the first preset voltage signal to put the power supply into a constant voltage driving mode. The first preset current signal is the maximum current signal in the constant voltage driving mode corresponding to the first preset voltage signal.

[0061] For example, when the function operation control signal is at a low level, a voltage control signal is output to the power supply based on the real-time voltage signal and the first preset voltage signal Vs based on the PID principle, so that the real-time voltage signal of the power supply is adjusted to the first preset voltage signal Vs, thereby causing the power supply to enter a constant voltage drive mode.

[0062] In at least one embodiment of the present application, the above-mentioned step S22 includes the following steps S221 to S225.

[0063] S221 : When the current signal is greater than the first preset current signal and less than the second preset current signal, output a current deviation value according to the current signal and the first preset current signal.

[0064] In the embodiment of the present application, a current deviation value is output according to the current signal and the first preset current signal I1 , and the current deviation value is a positive value.

[0065] S222: Perform calculation processing according to the current deviation value and output a calculation processing control signal.

[0066] The operation processing includes positive and negative operation processing; in the embodiment of the present application, when the current deviation value is negative, the operation processing control signal is a high level.

[0067] S223: Outputting a function operation control signal based on the operation processing control signal, and performing a function operation according to the current deviation value to output a function operation signal.

[0068] When the operation processing control signal is at a high level and the function operation control signal is at a high level, a function operation is performed according to the current deviation value to output a function operation signal; the function operation signal is a calibration voltage signal output by performing different function operations with the current deviation value as an independent variable, and the output calibration voltage signal is within (0-(second preset voltage signal V1-first preset voltage signal Vs)); the second preset voltage signal V1 is the lowest voltage signal in the constant voltage and constant current transition drive mode, generally 80% of the first preset voltage signal Vs, and can be set according to actual conditions. Different function operations include linear function operations, quadratic function operations, multiple function operations, or discrete function operations, which are not specifically limited in the embodiments of the present application; for example, refer to Figure 3 and Figure 4 In the example, if the current current signal is I3 and the function operation is a linear function, the function operation signal is the voltage signal V2 corresponding to the current current signal I3.

[0069] S224: Acquire real-time voltage signal.

[0070] In the embodiment of the present application, the real-time voltage signal Vo is any voltage signal when the load changes, depending on whether the load suddenly increases or decreases under the current real-time current signal; Figure 3 and Figure 4 For example, if the load suddenly increases under the current current signal I3 (the output voltage under the current real-time current signal is V2), the real-time voltage signal Vo is less than V2 because the real-time current signal does not respond; otherwise, the real-time voltage signal Vo is greater than V2.

[0071] S225: Outputting a voltage deviation signal according to the function operation signal and the first preset voltage signal, and outputting a current control signal to the power supply based on the voltage deviation signal and the real-time voltage signal to enable the power supply to enter a constant voltage and constant current transition driving mode.

[0072] The function operation signal and the first preset voltage signal output a voltage deviation signal. Since the function operation signal is within (0-(second preset voltage signal V1-first preset voltage signal Vs)), the voltage deviation signal is within the range of the second preset voltage signal V1-first preset voltage signal Vs. Based on the voltage deviation signal and the real-time voltage signal, a current control signal is output to the power supply, so that the voltage signal is adjusted to the voltage deviation signal, that is, adjusted to a specific voltage value within the range of the second preset voltage signal V1-first preset voltage signal Vs, so that the power supply enters a constant voltage and constant current transition drive mode.

[0073] In the embodiment of the present application, since the current signal increases when the voltage decreases in the constant voltage and constant current transition driving mode, the problem of no constant voltage and constant current transition driving mode in the prior art is avoided, and the constant voltage driving mode is directly switched to the constant current driving mode, the voltage is reduced, and the current signal remains unchanged, resulting in a reduction in the power supply output capacity. Therefore, the power supply output capacity is improved when switching between constant voltage and constant current.

[0074] In at least one embodiment of the present application, the above-mentioned step S23 includes the following steps S231 and S232.

[0075] S231: When the current signal is greater than or equal to the second preset current signal, output a current deviation value according to the current signal and the second preset current signal.

[0076] S232: Outputting a current control signal to the power supply according to the current deviation value to enable the power supply to enter a constant current driving mode.

[0077] For example, the second preset current signal I2 is a set current signal in the constant current driving mode; it is generally 1.8-2 times the first preset current signal I1.

[0078] The embodiment of the present application outputs a current control signal to the power supply according to the current deviation value based on the PID principle, so that the power supply output current signal is the second preset current signal I2, thereby causing the power supply to enter a constant current drive mode.

[0079] At least one embodiment of the present application also provides a power supply control device, which can execute a power supply control method provided by any of the above embodiments of the present application. The power supply control device can be implemented in the form of hardware and / or software, and has functional modules and beneficial effects corresponding to the execution method.

[0080] refer to Figure 6The power control device includes an acquisition module 10 and a drive mode module 20. The acquisition module 10 is used to acquire the current signal output by the power supply in real time. The drive mode module 20 is used to control the power supply to enter different drive modes based on the current signal. The different drive modes include a constant voltage drive mode, a constant voltage constant current transition drive mode, and a constant current drive mode. In the constant voltage constant current transition drive mode, the output current signal and voltage signal both vary with the load size, and the current signal and voltage signal are negatively correlated.

[0081] Since the current signals output by the power supply in real time are different when the power supply drives different loads, the power supply power control device of the embodiment of the present application can control the power supply to enter different driving modes according to the size of the current signal output by the power supply. In this way, the power supply power control device switches from the constant voltage driving mode to the constant current driving mode according to the load change, and adds a constant voltage and constant current transition driving mode. Since the current signal increases when the voltage decreases in the constant voltage and constant current transition driving mode, the problem of no constant voltage and constant current transition driving mode in the prior art is avoided, and the constant voltage driving mode is directly switched to the constant current driving mode, the voltage is reduced, and the current signal remains unchanged, resulting in a reduction in the power supply output capacity. Therefore, the power supply output capacity is improved when switching between constant voltage and constant current.

[0082] In at least one embodiment of the present application, reference Figure 7 The drive mode module 20 includes a constant voltage drive mode unit 21, a transition drive mode unit 22, and a constant current drive mode unit 23. The constant voltage drive mode unit 21 is configured to control the power supply to enter a constant voltage drive mode when the current signal is less than a first preset current signal. The transition drive mode unit 22 is configured to control the power supply to enter a constant voltage constant current transition drive mode when the current signal is greater than the first preset current signal and less than a second preset current signal. The constant current drive mode unit 23 is configured to control the power supply to enter a constant current drive mode when the current signal is greater than or equal to the second preset current signal.

[0083] In at least one embodiment of the present application, reference Figure 8The constant voltage driving mode unit 21 includes a first deviation value operation subunit 211, a first operation processing subunit 212, a first function operation subunit 213, a first voltage acquisition subunit 214 and a first voltage control signal output subunit 215. The first deviation value operation subunit 211 is used to output a current deviation value according to the current signal and the first preset current signal when the current signal is less than the first preset current signal. The first operation processing subunit 212 is used to perform operation processing according to the current deviation value and output an operation processing control signal. The first function operation subunit 213 is used to output a function operation control signal according to the operation processing control signal. The first voltage acquisition subunit 214 is used to obtain a real-time voltage signal. The first voltage control signal output subunit 215 is used to output a voltage control signal to the power supply based on the real-time voltage signal and the first preset voltage signal based on the function operation control signal to enable the power supply to enter the constant voltage driving mode. The first preset current signal is the maximum current signal in the constant voltage driving mode corresponding to the first preset voltage signal.

[0084] In at least one embodiment of the present application, reference Figure 8 The transition drive mode unit 22 includes a second deviation value operation subunit 221, a second operation processing subunit 222, a second function operation subunit 223, a second voltage acquisition subunit 224, and a second voltage control signal output subunit 225. The second deviation value operation subunit 221 is used to output a current deviation value based on the current signal and the first preset current signal when the current signal is greater than the first preset current signal and less than the second preset current signal. The second operation processing subunit 222 is used to perform operation processing based on the current deviation value and output an operation processing control signal. The second function operation subunit 223 is used to output a function operation control signal based on the operation processing control signal, and perform function operation based on the current deviation value to output a function operation signal. The second voltage acquisition subunit 224 is used to obtain a real-time voltage signal. The second voltage control signal output subunit 225 is used to output a voltage deviation signal based on the function operation signal and the first preset voltage signal, and output a current control signal to the power supply based on the voltage deviation signal and the real-time voltage signal to enable the power supply to enter the constant voltage and constant current transition drive mode.

[0085] It can be understood that each unit of the constant voltage driving mode unit 21 , the transition driving mode unit 22 and the constant current driving mode unit 23 in the above embodiment can be implemented in the form of hardware and / or software.

[0086] In some embodiments, each sub-unit of the constant voltage driving mode unit 21 , the transition driving mode unit 22 , and the constant current driving mode unit 23 may be implemented in a hardware structure.

[0087] In at least one embodiment of the present application, Figure 8 and Figure 9The first deviation value operator 211 and the second deviation value operator 221 are both first difference operators 100; the first operation processing subunit 212 and the second operation processing subunit 222 are both positive limiters 200; the first function operator 213 and the second function operator 223 are both function operators 300; the first voltage control signal output subunit 215 is a second difference operator 400 and a first PID operator 500. The second voltage control signal output subunit 225 is also a second difference operator 400 and a first PID operator 500.

[0088] The first input terminal of the first difference operator 100 receives the first preset current signal I1; the second input terminal of the first difference operator 100 receives the real-time current signal Io; the output terminal of the first difference operator 100 is electrically connected to the input terminal of the positive limiter 200; the output terminal of the positive limiter 200 is electrically connected to the input terminal of the function operator 300; the voltage output terminal of the function operator 300 is electrically connected to the first input terminal of the second difference operator 400; the second input terminal of the second difference operator 400 receives the first preset voltage signal Vs; the third input terminal of the second difference operator 400 receives the real-time voltage signal Vo; the output terminal of the second difference operator 400 is electrically connected to the input terminal of the first PID operator 500; the output terminal of the first PID operator 500 outputs a voltage control signal.

[0089] The first preset current signal I1 is a maximum current signal in the constant voltage driving mode corresponding to the first preset voltage signal; the first preset current signal I1 is smaller than the second preset current signal I2 in the constant current driving mode.

[0090] The power control device includes three working modes, namely constant voltage drive mode 01, constant voltage constant current transition drive mode 02 and constant current drive mode 03; specifically, when the real-time current signal Io is less than the first preset current signal I1, the first preset current signal I1 is output to the first difference operator 100, and the first difference operator 100 performs a difference operation based on the first preset current signal I1 and the real-time current signal Io. The difference operation output is a negative value, then the positive limiter 200 outputs zero, and the function operator 300 outputs zero, then the second difference operator 400 will directly output a voltage deviation based on the first preset voltage signal Vs and the real-time voltage signal Vo, and the first PID operator 500 outputs a first voltage control signal based on the first voltage deviation based on the PID principle, thereby controlling the real-time voltage signal of the power supply to be equal to the first preset voltage signal Vs, thereby causing the power supply to enter the constant voltage drive mode (corresponding to the above steps S211 to S215).

[0091] When the real-time current signal Io is within the range of the first preset current signal I1 and the second preset current signal I2, the first preset current signal I1 is output to the first difference operator 100. The first difference operator 1 performs a difference operation based on the first preset current signal I1 and the real-time current signal Io. The difference operation output is a positive value. At this time, the positive limiter 200 outputs a positive value. The function operator 300 converts the current deviation value into a voltage value f() by performing different functions. The voltage value f() is within the range of (0-(Vs-V1)). The voltage value is output to the second difference operator 400. The second difference operator 400 determines the voltage calibration value based on the difference between the voltage value converted by different functions and the first preset voltage signal Vs, which is within the range of (Vs-V1). The voltage deviation is determined based on the voltage calibration value and the real-time voltage signal Vo. The first PID operator 500 outputs a second voltage control signal based on the voltage deviation based on the PID principle, thereby controlling the real-time voltage signal of the power supply to be equal to, thereby causing the power supply to enter the constant voltage and constant current transition mode (see Figure 3 and Figure 4 The volt-ampere characteristic curve corresponds to the above steps S221 to S225); thus, the embodiment of the present application eliminates the oscillation during the critical state of the load constant voltage and constant current by adding a constant voltage constant current transition mode, thereby improving the availability of the power supply.

[0092] It should be noted that the function operator 300 performs different function conversions f() on the voltage comparison difference. The function operator 300 can be a linear function generator, a quadratic function generator, a multi-function function generator, or a discrete function. The linear function generator is specifically: f()=+b; the second function generator is specifically: f()=+k+b. The output voltage value f() of each function operator 300 only needs to be within the range of (0-(Vs-V1)). The type of the function operator is not specifically limited here. Figure 3 The function operator 300 is only shown as the output volt-ampere characteristic diagram of the power supply control circuit of the primary function generator; in other embodiments, Figure 4 The diagram shows the output volt-ampere characteristic of the power supply when the power control device drives the power supply when the function operator 300 selects a quadratic function generator, a multi-function generator, or a discrete function.

[0093] In some embodiments, reference Figure 8 The constant current drive mode unit 23 includes a current control signal output subunit. The current control signal output subunit is configured to output a second current deviation value based on the current signal and the second preset current signal I2 when the current signal is greater than or equal to the second preset current signal I2; and output a current control signal to the power supply based on the current deviation value to enable the power supply to enter the constant current drive mode.

[0094] In at least one embodiment of the present application, reference Figure 9The constant current drive mode unit 23 includes a third difference operator 600 and a second PID operator 700. A first input terminal of the third difference operator 600 receives the second preset current signal I2; a second input terminal of the third difference operator 600 receives the real-time current signal Io. An output terminal of the third difference operator 600 is electrically connected to an input terminal of the second PID operator 700; an output terminal of the second PID operator 700 outputs a current control signal.

[0095] It should be noted that when the real-time current signal Io is greater than or equal to the second preset current signal I2, the current deviation value between the real-time current signal Io and the second preset current signal I2 is output to the second PID operator 700. The second PID operator 700 outputs a current control signal according to the current deviation based on the PID principle, thereby controlling the real-time current signal of the power supply to be equal to the second preset current signal I2, thereby causing the power supply to enter a constant current drive mode (corresponding to the above steps S231 and S232).

[0096] In at least one embodiment of the present application, reference Figure 9 The power control device further includes a multiplexer 800. The output of the third difference operator 600 is electrically connected to the input of the second PID operator 700; the output of the second PID operator 700 is electrically connected to the first input of the multiplexer 800; and the second input of the multiplexer 800 is electrically connected to the output of the transition drive mode unit 22.

[0097] In the embodiment of the present application, the multiplexer 800 can select through different channels whether to drive the power supply to work using the voltage control signal output by the first PID operator 500 or to drive the power supply to work using the current control signal output by the second PID operator 700, thereby ensuring independent control of the power supply control mode.

[0098] It should be noted that the combination of the various technical features in the embodiments of the present application is not limited to the combination described in the embodiments of the present application or the combination described in the specific embodiments. All technical features described in the present application can be freely combined or combined in any way unless there is a contradiction between them.

[0099] As used in this application and the claims, unless the context clearly indicates otherwise, the words "a," "an," and / or "the" are not intended to refer to the singular but may include the plural. Generally speaking, the term "comprising" only indicates the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements.

[0100] The terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first," "second," etc. may explicitly or implicitly include one or more of the features.

[0101] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A power supply control method, characterized in that: include: S10: obtaining the current signal output by the power supply in real time; S20: Control the power supply to enter different driving modes according to the current signal. The different driving modes include constant voltage driving mode, constant voltage constant current transition driving mode and constant current driving mode. In the constant voltage constant current transition driving mode, the output current signal and voltage signal both vary with the load size, and the current signal and voltage signal are negatively correlated.

2. A power supply control method according to claim 1, characterized in that: Step S20 includes: S21: When the current signal is less than the first preset current signal, controlling the power supply to enter a constant voltage driving mode; S22: When the current signal is greater than the first preset current signal and less than the second preset current signal, the power supply is controlled to enter a constant voltage and constant current transition driving mode; S23: When the current signal is greater than or equal to the second preset current signal, the power supply is controlled to enter a constant current driving mode.

3. A power supply control method according to claim 2, characterized in that: Step S21 includes: S211: When the current signal is less than the first preset current signal, output a current deviation value according to the current signal and the first preset current signal; S212: Performing calculation processing according to the current deviation value and outputting a calculation processing control signal; S213: Outputting a function operation control signal according to the operation processing control signal; S214: Acquire real-time voltage signal; S215: Based on the function operation control signal, output a voltage control signal to the power supply according to the real-time voltage signal and the first preset voltage signal to enable the power supply to enter the constant voltage driving mode, and the first preset current signal is the maximum current signal under the constant voltage driving mode corresponding to the first preset voltage signal.

4. A power supply control method according to claim 2, characterized in that: Step S22 includes: S221: When the current signal is greater than the first preset current signal and less than the second preset current signal, output a current deviation value according to the current signal and the first preset current signal; S222: Performing calculation processing according to the current deviation value and outputting a calculation processing control signal; S223: outputting a function operation control signal based on the operation processing control signal, and performing a function operation according to the current deviation value to output a function operation signal; S224: Acquire real-time voltage signal; S225: Outputting a voltage deviation signal according to the function operation signal and the first preset voltage signal, and outputting a current control signal to the power supply based on the voltage deviation signal and the real-time voltage signal to enable the power supply to enter a constant voltage and constant current transition driving mode.

5. A power supply control method according to any one of claims 2 to 4, characterized in that: Step S23 includes: S231: When the current signal is greater than or equal to the second preset current signal, output a current deviation value according to the current signal and the second preset current signal; S232: Outputting a current control signal to the power supply according to the current deviation value to enable the power supply to enter a constant current driving mode.

6. A power supply control device, characterized in that: Including acquisition module and drive mode module, The acquisition module is used to obtain the current signal output by the power supply in real time; The drive mode module is used to control the power supply to enter different drive modes according to the current signal. The different drive modes include constant voltage drive mode, constant voltage constant current transition drive mode and constant current drive mode. In the constant voltage constant current transition drive mode, the output current signal and voltage signal both vary with the load size, and the current signal and voltage signal are negatively correlated.

7. A power supply control device according to claim 6, characterized in that: The driving mode module includes a constant voltage driving mode unit, a transition driving mode unit and a constant current driving mode unit. The constant voltage driving mode unit is used to control the power supply to enter the constant voltage driving mode when the current signal is less than the first preset current signal; The transition driving mode unit is used to control the power supply to enter a constant voltage and constant current transition driving mode when the current signal is greater than a first preset current signal and less than a second preset current signal; The constant current driving mode unit is used to control the power supply to enter the constant current driving mode when the current signal is greater than or equal to the second preset current signal.

8. The power control device according to claim 7, characterized in that: The constant voltage driving mode unit includes a first deviation value operation subunit, a first operation processing subunit, a first function operation subunit, a first voltage acquisition subunit and a first voltage control signal output subunit; and / or, the transition driving mode unit includes a second deviation value operation subunit, a second operation processing subunit, a second function operation subunit, a second voltage acquisition subunit and a second voltage control signal output subunit; and / or, Among them, the first deviation value operation subunit is used to output a current deviation value according to the current signal and the first preset current signal when the current signal is less than the first preset current signal; the first operation processing subunit is used to perform operation processing according to the current deviation value and output an operation processing control signal; the first function operation subunit is used to output a function operation control signal according to the operation processing control signal; the first voltage acquisition subunit is used to acquire a real-time voltage signal; the first voltage control signal output subunit is used to output a voltage control signal to the power supply based on the function operation control signal according to the real-time voltage signal and the first preset voltage signal to enable the power supply to enter a constant voltage drive mode, and the first preset current signal is the maximum current signal in the constant voltage drive mode corresponding to the first preset voltage signal; The second deviation value operation subunit is used to output a current deviation value according to the current signal and the first preset current signal when the current signal is greater than the first preset current signal and less than the second preset current signal; the second operation processing subunit is used to perform operation processing according to the current deviation value and output an operation processing control signal; the second function operation subunit is used to output a function operation control signal based on the operation processing control signal, and perform function operation according to the current deviation value to output a function operation signal; the second voltage acquisition subunit is used to acquire a real-time voltage signal; the second voltage control signal output subunit is used to output a voltage deviation signal according to the function operation signal and the first preset voltage signal, and output a current control signal to the power supply based on the voltage deviation signal and the real-time voltage signal to enable the power supply to enter a constant voltage and constant current transition drive mode.

9. The power control device according to claim 8, characterized in that: The first deviation value operator unit and the second deviation value operator unit are both first difference operators; the first operation processing subunit and the second operation processing subunit are both positive limiters; the first function operator unit and the second function operator unit are both function operators; the first voltage control signal output subunit is the second difference operator and the first PID operator, and the second voltage control signal output subunit is the second difference operator and the first PID operator; the first input end of the first difference operator receives the first preset current signal; the second input end of the first difference operator receives the real-time current signal; the output end of the first difference operator is electrically connected to the input end of the positive limiter; the output end of the positive limiter is electrically connected to the input end of the function operator; the voltage output end of the function operator is electrically connected to the first input end of the second difference operator; The second input terminal of the second difference operator receives the first preset voltage signal; The third input terminal of the second difference operator receives the real-time voltage signal; The output end of the second difference operator is electrically connected to the input end of the first PID operator; the output end of the first PID operator outputs a voltage control signal.

10. A power control device according to any one of claims 6 to 9, characterized in that: The constant current drive mode unit includes a third difference operator and a second PID operator, wherein a first input end of the third difference operator receives a second preset current signal, a second input end of the third difference operator receives a real-time current signal, an output end of the third difference operator is electrically connected to an input end of the second PID operator, and an output end of the second PID operator outputs a current control signal; In which, the power supply power control device further includes a multiplexer, the output end of the third difference operator is electrically connected to the input end of the second PID operator; the output end of the second PID operator is electrically connected to the first input end of the multiplexer; and the second input end of the multiplexer is electrically connected to the output end of the transition drive mode unit.

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