DC power supply control method, device, medium, processor and DC power supply system

Abstract

The present application provides a control method, device, medium, processor and DC power supply system for a DC power supply, the method comprising: obtaining the actual output current and actual output voltage of the DC power supply; when the actual output current is less than the rated current and lasts for a first period of time, determining a first preset current value based on the actual output voltage, a first limited power and a first limited current, wherein the first limited power is greater than the rated power and the first limited current is greater than the rated current; when the actual output current is greater than the rated current and lasts for a second period of time, determining a second preset current value based on the actual output voltage, a second limited power and a second limited current, wherein the second limited power is less than or equal to the rated power and the second limited current is less than or equal to the rated current; adjusting the power level based on at least the actual output current and the first preset current value or the second preset current value to stabilize the output current. The present application avoids the problem of equipment power failure or reset caused by the current limiting protection of the DC power supply.

Description

Technical Field

[0001] The present application relates to the field of power supplies, and more specifically, to a direct current (DC) power supply control method, a control device, a computer-readable storage medium, a processor, and a DC power supply system. Background Art

[0002] In DC (direct current) power supply applications, the load may draw less than the rated current due to unknown load conditions, or it may draw significantly more current due to internal load damage or circuit shorts. To protect the power supply from damage, DC power supplies typically limit the output current so that the output current does not exceed the rated current when connected to any load. Therefore, DC power supplies typically have two feedback control loops: a voltage feedback control loop that stabilizes the output voltage at a set value when the output current does not exceed the rated value; and a current feedback control loop that limits the output current to the rated value when the output current exceeds the rated value. The current limit is typically fixed, generally equal to the rated current of the product with a margin. When a load (such as a motor or solenoid valve) experiences a short-term inrush current, the DC power supply's current feedback loop can cause the output voltage to drop, potentially causing other equipment to lose power or reset.

[0003] Therefore, how to avoid problems such as power failure and reset of equipment caused by current limiting protection of DC power supply is a problem that needs to be solved urgently in the existing technology.

[0004] The above information disclosed in the background technology section is only used to enhance the understanding of the background technology of the technology described in this article. Therefore, the background technology may contain certain information that does not form the prior art known in this country to those skilled in the art. Summary of the Invention

[0005] The main purpose of this application is to provide a DC power supply control method, control device, computer-readable storage medium, processor and DC power supply system to solve the problem in the prior art that the current limiting protection of the DC power supply may cause power failure and reset of the device.

[0006] According to one aspect of an embodiment of the present invention, a method for controlling a direct current power supply is provided. The direct current power supply includes a power stage. The method includes: obtaining an actual output current and an actual output voltage of the direct current power supply; when the actual output current is less than a rated current of the direct current power supply and lasts for a first period of time, determining a first preset current value based on the actual output voltage, a first limited power, and a first limited current, wherein the first limited power is a preset power value and is greater than the rated power of the direct current power supply, and the first limited current is a preset current value and is greater than the rated current; when the actual output current is greater than the rated current and lasts for a second period of time, determining a second preset current value based on the actual output voltage, a second limited power, and a second limited current, wherein the second limited power is a preset power value and is less than or equal to the rated power, and the second limited current is a preset current value and is less than or equal to the rated current; and adjusting the power stage based on at least the actual output current and the first preset current value or the second preset current value, so that the adjusted actual output current is less than or equal to the first preset current value or the second preset current value.

[0007] Optionally, when the actual output current is less than the rated current of the DC power supply and lasts for a first period of time, a first preset current value is determined based on the actual output voltage, the first limiting power and the first limiting current, including: when the actual output current is less than the rated current and lasts for the first period of time, obtaining the first limiting power and the first limiting current; determining that the ratio of the first limiting power to the actual output voltage is a third limiting current; and determining that the smaller value between the third limiting current and the first limiting current is the first preset current value.

[0008] Optionally, when the actual output current is greater than the rated current and lasts for a second period of time, a second preset current value is determined based on the actual output voltage, the second limiting power and the second limiting current, including: when the actual output current is greater than the rated current and lasts for a second period of time, obtaining the second limiting power and the second limiting current; determining that the ratio of the second limiting power to the actual output voltage is a fourth limiting current; and determining that the smaller value between the fourth limiting current and the second limiting current is the second preset current value.

[0009] Optionally, the power level is adjusted at least according to the actual output current and the first preset current value or the second preset current value, so that the adjusted actual output current is less than or equal to the first preset current value or the second preset current value, including: determining a first adjustment amount of the power level according to the actual output current and the first preset current value or the second preset current value; obtaining the rated voltage of the DC power supply; determining a second adjustment amount of the power level according to the actual output voltage and the rated voltage; adjusting the power level according to the first adjustment amount and the second adjustment amount, so that the adjusted actual output current is less than or equal to the first preset current value or the second preset current value, and the adjusted actual output voltage is less than or equal to the rated voltage.

[0010] Optionally, the first adjustment amount of the power level is determined based on the actual output current and the first preset current value or the second preset current value, including: determining that the difference between the first preset current value or the second preset current value and the actual output current is a first difference; based on the first difference, determining the adjustment amount of the duty cycle and / or period of the power level is the first adjustment; based on the actual output voltage and the rated voltage, the second adjustment amount of the power level is determined, including: determining that the difference between the rated voltage and the actual output voltage is a second difference; based on the second difference, determining the adjustment amount of the duty cycle and / or the period is the second adjustment.

[0011] Optionally, adjusting the power level according to the first adjustment amount and the second adjustment amount includes: adjusting the power level according to a smaller value between the first adjustment amount and the second adjustment amount.

[0012] According to another aspect of an embodiment of the present invention, a control device for a DC power supply is further provided, wherein the DC power supply includes a power stage, and the device includes an acquisition unit, a first determination unit, a second determination unit, and an adjustment unit, wherein the acquisition unit is used to obtain an actual output current and an actual output voltage of the DC power supply; the first determination unit is used to determine a first preset current value based on the actual output voltage, a first limited power, and a first limited current when the actual output current is less than the rated current of the DC power supply and lasts for a first period of time, wherein the first limited power is a preset power value, and the first limited power is greater than the rated power of the DC power supply, the first limited current is a preset current value, and the first limited current is greater than the rated power of the DC power supply, The current is greater than the rated current; the second determining unit is used to determine a second preset current value according to the actual output voltage, the second limiting power and the second limiting current when the actual output current is greater than the rated current and lasts for a second period of time, wherein the second limiting power is a preset power value and the second limiting power is less than or equal to the rated power, and the second limiting current is a preset current value and the second limiting current is less than or equal to the rated current; the adjusting unit is used to adjust the power level according to at least the actual output current and the first preset current value or the second preset current value, so that the adjusted actual output current is less than or equal to the first preset current value or the second preset current value.

[0013] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is further provided, wherein the computer-readable storage medium includes a stored program, wherein the program executes any one of the methods described above.

[0014] According to another aspect of an embodiment of the present invention, a processor is further provided, wherein the processor is configured to run a program, wherein any one of the methods is executed when the program is run.

[0015] According to another aspect of an embodiment of the present invention, a DC power supply system is provided, including a DC power supply and a controller, wherein the DC power supply includes a power stage; and the controller is configured to execute any one of the methods described.

[0016] According to the technical solution of the present application, in the control method of the DC power supply, first, the actual output current and the actual output voltage of the DC power supply are obtained; then, when the actual output current is less than the rated current of the DC power supply and lasts for a first period of time, a first preset current value is determined based on the actual output voltage, the first limited power and the first limited current; when the actual output current is greater than the rated current and lasts for a second period of time, a second preset current value is determined based on the actual output voltage, the second limited power and the second limited current, wherein the first limited power is greater than the rated power of the DC power supply, the second limited power is less than the rated power, the first limited current is greater than the rated current, and the second limited current is less than or equal to the rated current; finally, the power level is adjusted based on at least the actual output current and the first preset current value or the second preset current value to stabilize the output current. Compared with the existing technology, in which the current feedback control loop inside the DC power supply stabilizes the output current according to a fixed limiting current, resulting in a drop in the output voltage during instantaneous current limiting, causing problems such as device power failure and reset. The method of the present application takes into account that the power device can withstand a current value far greater than the rated current for a short time, and obtains different limiting currents according to the actual output current, the rated current, the first time duration and the second time duration, and then stabilizes the output current according to different limiting currents, ensuring that the DC power supply will not operate for a long time in an environment exceeding the rated current or exceeding the rated power, thereby ensuring the safety of the DC power supply. At the same time, it realizes the dynamic setting of the current limiting value, ensuring that the power device can instantaneously operate in an environment exceeding the rated current or exceeding the rated power, thereby avoiding problems such as device power failure and reset caused by instantaneous current limiting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0018] Figure 1 A schematic flow chart of a method for controlling a DC power supply according to an embodiment of the present application is shown;

[0019] Figure 2 A schematic diagram of a control device for a DC power supply according to an embodiment of the present application is shown;

[0020] Figure 3 A control principle diagram of a DC power supply according to an embodiment of the present application is shown;

[0021] Figure 4 Shown Figure 3 Schematic diagram of the corresponding IV curve of the DC power supply output;

[0022] Figure 5 A control principle diagram of a DC power supply according to another embodiment of the present application is shown;

[0023] Figure 6 Shown Figure 5 Schematic diagram of the corresponding IV curve of the DC power supply;

[0024] Figure 7 A schematic diagram of a DC power supply system according to an embodiment of the present application is shown.

[0025] The above drawings include the following reference numerals:

[0026] 100. First subtractor; 101. First PID regulator; 102. Second subtractor; 103. Second PID regulator; 104. First selection switch; 105. Power stage; 200. Load; 300. Second selector; 301. Third selector; 302. Fourth selector; 303. Delay locked loop; 304. Comparator; 305. Divider; 306. Multiplier. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element or intervening elements may be present. Moreover, in the specification and claims, when it is described that an element is "connected to" another element, the element may be "directly connected to" the other element or "connected to" the other element through a third element.

[0031] As mentioned in the background technology, the current limiting protection of the DC power supply in the prior art may cause power failure and reset of the equipment. In order to solve the above problems, a typical embodiment of the present application provides a DC power supply control method, a control device, a computer-readable storage medium, a processor and a DC power supply system.

[0032] According to an embodiment of the present application, a method for controlling a DC power supply is provided. The DC power supply includes a power stage.

[0033] Figure 1 FIG. 1 is a flow chart of a method for controlling a DC power supply according to an embodiment of the present application. Figure 1 As shown, the method includes the following steps:

[0034] Step S101, obtaining the actual output current and actual output voltage of the DC power supply;

[0035] Step S102: When the actual output current is less than the rated current of the DC power supply and continues for a first period of time, determining a first preset current value based on the actual output voltage, the first limited power, and the first limited current, wherein the first limited power is a preset power value and is greater than the rated power of the DC power supply, and the first limited current is a preset current value and is greater than the rated current;

[0036] Step S103: When the actual output current is greater than the rated current and lasts for a second period of time, determining a second preset current value based on the actual output voltage, the second limited power, and the second limited current, wherein the second limited power is a preset power value and is less than or equal to the rated power, and the second limited current is a preset current value and is less than or equal to the rated current;

[0037] Step S104 , adjusting the power level at least according to the actual output current and the first preset current value or the second preset current value, so that the adjusted actual output current is less than or equal to the first preset current value or the second preset current value.

[0038] In the above-mentioned control method of the DC power supply, first, the actual output current and the actual output voltage of the DC power supply are obtained; then, when the above-mentioned actual output current is less than the rated current of the DC power supply and lasts for a first period of time, a first preset current value is determined based on the above-mentioned actual output voltage, the first limited power and the first limited current; when the above-mentioned actual output current is greater than the rated current and lasts for a second period of time, a second preset current value is determined based on the above-mentioned actual output voltage, the second limited power and the second limited current, wherein the above-mentioned first limited power is greater than the rated power of the DC power supply, the above-mentioned second limited power is less than the above-mentioned rated power, the above-mentioned first limited current is greater than the above-mentioned rated current, and the above-mentioned second limited current is less than or equal to the above-mentioned rated current; finally, the above-mentioned power level is adjusted based on at least the above-mentioned actual output current and the above-mentioned first preset current value or the above-mentioned second preset current value to stabilize the output current. Compared with the existing technology, the current feedback control loop inside the DC power supply stabilizes the output current according to a fixed limiting current, which causes the output voltage to drop during instantaneous current limiting, resulting in problems such as device power failure and reset. The above method of the present application takes into account that the power device can withstand a current value far greater than the rated current for a short time, and obtains different limiting currents according to the above actual output current, the above rated current, the above first time duration and the second time duration, and then stabilizes the output current according to different limiting currents, ensuring that the DC power supply will not operate for a long time in an environment exceeding the rated current or exceeding the rated power, thereby ensuring the safety of the DC power supply. At the same time, it realizes the dynamic setting of the current limiting value, ensuring that the power device can instantaneously operate in an environment exceeding the rated current or exceeding the rated power, thereby avoiding problems such as device power failure and reset caused by instantaneous current limiting.

[0039] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0040] In order to further ensure the safe use of the above-mentioned DC power supply while further ensuring that the equipment will not lose power or reset due to instantaneous current limiting, and taking into account the tolerance of the DC power supply, according to a specific embodiment of the present application, the above-mentioned first limited power is twice the above-mentioned rated power, the above-mentioned first limited current is four times the above-mentioned rated current, the above-mentioned second limited power is equal to the above-mentioned rated power, and the above-mentioned second limited current is equal to the above-mentioned rated current. Of course, the values of the above-mentioned first limited power, the above-mentioned first limited current, the above-mentioned second limited power and the above-mentioned second limited current are not limited to the above-mentioned values. Those skilled in the art can flexibly set the above-mentioned values according to actual conditions. For example, the above-mentioned first limited power can also be greater than twice the above-mentioned rated power, and the above-mentioned first limited current can also be greater than four times the above-mentioned rated current. In this case, the corresponding control cost of the above-mentioned DC power supply will be relatively high.

[0041] Specifically, those skilled in the art can flexibly set the first duration and the second duration according to different operating parameters of the DC power supply, as long as the tolerance of the DC power supply is not exceeded.

[0042] According to another specific embodiment of the present application, when the actual output current is less than the rated current of the DC power supply and lasts for a first period of time, determining a first preset current value based on the actual output voltage, the first limited power, and the first limited current includes: when the actual output current is less than the rated current and lasts for the first period of time, obtaining the first limited power and the first limited current; determining the ratio of the first limited power to the actual output voltage as a third limited current; and determining the smaller of the third limited current and the first limited current as the first preset current value. When the actual output current is less than the rated current and lasts for the first period of time, dividing the first limited power by the actual output voltage according to I=P / U to obtain the third limited current. The third limited current can prevent the actual output current value of the DC power supply from exceeding its tolerable current value and causing damage when the actual output voltage is low. By taking the smaller of the third limited current and the first limited current as the first preset current value, the DC power supply can be further prevented from being current-limited and causing power failure and reset problems when operating in an environment exceeding the rated current or power for a short period of time.

[0043] To further ensure the safe operation of the DC power supply, in another specific embodiment of the present application, when the actual output current exceeds the rated current and persists for a second period of time, a second preset current value is determined based on the actual output voltage, the second limited power, and the second limited current. This includes: when the actual output current exceeds the rated current and persists for a second period of time, obtaining the second limited power and the second limited current; determining the ratio of the second limited power to the actual output voltage as a fourth limited current; and determining the smaller of the fourth limited current and the second limited current as the second preset current value. After the DC power supply operates for a certain period of time exceeding the rated power and rated current, the smaller of the fourth limited current and the second limited current is taken as the second preset current value, and the actual output current is subsequently adjusted based on the second preset current value, further ensuring that the power supply can operate within the rated value range, thereby further ensuring the safety of the DC power supply.

[0044] According to another specific embodiment of the present application, the power level is adjusted at least according to the actual output current and the first preset current value or the second preset current value, so that the adjusted actual output current is less than or equal to the first preset current value or the second preset current value, including: determining a first adjustment amount of the power level according to the actual output current and the first preset current value or the second preset current value; obtaining the rated voltage of the DC power supply; determining a second adjustment amount of the power level according to the actual output voltage and the rated voltage; adjusting the power level according to the first adjustment amount and the second adjustment amount, so that the adjusted actual output current is less than or equal to the first preset current value or the second preset current value, and the adjusted actual output voltage is less than or equal to the rated voltage. In the above embodiment, when the above-mentioned actual output current is less than the above-mentioned first preset current value or the above-mentioned second preset current value, the above-mentioned actual output voltage is stabilized at the rated voltage through voltage feedback control; when the above-mentioned actual output current is greater than the above-mentioned first preset current value or the above-mentioned second preset current value, the above-mentioned actual output current is limited to the above-mentioned first preset current value or the above-mentioned second preset current value through the above-mentioned current feedback control, thereby realizing the constant voltage and current limiting function of the DC power supply.

[0045] In order to further ensure that feedback control of the power supply is achieved relatively simply and quickly, in another specific embodiment of the present application, the first adjustment amount of the above-mentioned power level is determined based on the above-mentioned actual output current and the above-mentioned first preset current value or the above-mentioned second preset current value, including: determining that the difference between the above-mentioned first preset current value or the above-mentioned second preset current value and the above-mentioned actual output current is a first difference; based on the above-mentioned first difference, determining the adjustment amount of the duty cycle and / or period of the above-mentioned power level is the above-mentioned first adjustment amount; based on the above-mentioned actual output voltage and the above-mentioned rated voltage, determining the second adjustment amount of the above-mentioned power level, including: determining that the difference between the above-mentioned rated voltage and the above-mentioned actual output voltage is a second difference; based on the above-mentioned second difference, determining the adjustment amount of the above-mentioned duty cycle and / or the above-mentioned period is the above-mentioned second adjustment amount.

[0046] Specifically, adjusting the power level according to the first adjustment amount and the second adjustment amount includes: adjusting the power level according to a smaller value between the first adjustment amount and the second adjustment amount.

[0047] The present application also provides a control device for a DC power supply. The DC power supply includes a power stage. It should be noted that the control device for a DC power supply according to the present application can be used to execute the control method for a DC power supply according to the present application. The following describes the control device for a DC power supply according to the present application.

[0048] Figure 2 Schematic diagram of a control device for a DC power supply according to an embodiment of the present application. Figure 2As shown, the device includes an acquisition unit 10, a first determination unit 20, a second determination unit 30 and an adjustment unit 40, wherein the acquisition unit 10 is used to obtain the actual output current and the actual output voltage of the DC power supply; the first determination unit 20 is used to determine a first preset current value according to the actual output voltage, the first limited power and the first limited current when the actual output current is less than the rated current of the DC power supply and lasts for a first period of time, wherein the first limited power is a preset power value and the first limited power is greater than the rated power of the DC power supply, the first limited current is a preset current value and the first limited current is greater than the rated current; the second determination unit 20 is used to determine a first preset current value according to the actual output voltage, the first limited power and the first limited current when the actual output current is less than the rated current of the DC power supply and lasts for a first period of time, wherein the first limited power is a preset power value and the first limited power is greater than the rated power of the DC power supply, the first limited current is a preset current value and the first limited current is greater than the rated current; The unit 30 is used to determine the second preset current value based on the above-mentioned actual output voltage, the second limiting power and the second limiting current when the above-mentioned actual output current is greater than the above-mentioned rated current and lasts for a second period of time, wherein the above-mentioned second limiting power is a preset power value and the above-mentioned second limiting power is less than or equal to the above-mentioned rated power, and the above-mentioned second limiting current is a preset current value and the above-mentioned second limiting current is less than or equal to the above-mentioned rated current; the above-mentioned adjustment unit 40 is used to adjust the above-mentioned power level based on at least the above-mentioned actual output current and the above-mentioned first preset current value or the above-mentioned second preset current value, so that the adjusted above-mentioned actual output current is less than or equal to the above-mentioned first preset current value or the above-mentioned second preset current value.

[0049] In the control device of the above-mentioned DC power supply, the actual output current and the actual output voltage of the above-mentioned DC power supply are obtained by the above-mentioned acquisition unit; when the above-mentioned actual output current is less than the rated current of the above-mentioned DC power supply and lasts for a first period of time, the above-mentioned first determination unit determines a first preset current value based on the above-mentioned actual output voltage, the first limiting power and the first limiting current; when the above-mentioned actual output current is greater than the above-mentioned rated current and lasts for a second period of time, the above-mentioned second determination unit determines a second preset current value based on the above-mentioned actual output voltage, the second limiting power and the second limiting current, wherein the above-mentioned first limiting power is greater than the rated power of the above-mentioned DC power supply, the above-mentioned second limiting power is less than the above-mentioned rated power, the above-mentioned first limiting current is greater than the above-mentioned rated current, and the above-mentioned second limiting current is less than or equal to the above-mentioned rated current; the above-mentioned power level is adjusted by the above-mentioned adjustment unit at least according to the above-mentioned actual output current and the above-mentioned first preset current value or the above-mentioned second preset current value to stabilize the output current. Compared with the existing technology, the current feedback control loop inside the DC power supply stabilizes the output current according to a fixed limiting current, which causes the output voltage to drop during instantaneous current limiting, resulting in problems such as equipment power failure and reset. The above-mentioned device of the present application takes into account that the power device can withstand a current value far greater than the rated current for a short time. Different limiting currents are obtained according to the above-mentioned actual output current, the above-mentioned rated current, the above-mentioned first time duration and the second time duration, and then the output current is stabilized according to different limiting currents, ensuring that the DC power supply will not work for a long time in an environment exceeding the rated current or exceeding the rated power, thereby ensuring the safety of the DC power supply. At the same time, the dynamic setting of the current limiting value is realized, ensuring that the power device can instantaneously work in an environment exceeding the rated current or exceeding the rated power, thereby avoiding problems such as equipment power failure and reset caused by instantaneous current limiting.

[0050] In order to further ensure the safe use of the above-mentioned DC power supply while further ensuring that the equipment will not lose power or reset due to instantaneous current limiting, and taking into account the tolerance of the DC power supply, according to a specific embodiment of the present application, the above-mentioned first limited power is twice the above-mentioned rated power, the above-mentioned first limited current is four times the above-mentioned rated current, the above-mentioned second limited power is equal to the above-mentioned rated power, and the above-mentioned second limited current is equal to the above-mentioned rated current. Of course, the values of the above-mentioned first limited power, the above-mentioned first limited current, the above-mentioned second limited power and the above-mentioned second limited current are not limited to the above-mentioned values. Those skilled in the art can flexibly set the above-mentioned values according to actual conditions. For example, the above-mentioned first limited power can also be greater than twice the above-mentioned rated power, and the above-mentioned first limited current can also be greater than four times the above-mentioned rated current. In this case, the corresponding control cost of the above-mentioned DC power supply will be relatively high.

[0051] Specifically, those skilled in the art can flexibly set the first duration and the second duration according to different operating parameters of the DC power supply, as long as the tolerance of the DC power supply is not exceeded.

[0052] According to another specific embodiment of the present application, the first determination unit includes a first acquisition module, a first determination module, and a second determination module, wherein the first acquisition module is configured to acquire the first limited power and the first limited current when the actual output current is less than the rated current and lasts for a first time period; the first determination module is configured to determine the ratio of the first limited power to the actual output voltage as a third limited current; and the second determination module is configured to determine the smaller of the third limited current and the first limited current as the first preset current value. When the actual output current is less than the rated current and lasts for the first time period, the first limited power is divided by the actual output voltage according to I=P / U to obtain the third limited current. The third limited current can prevent the actual output current value of the DC power supply from exceeding its tolerable current value and causing damage when the actual output voltage is low. By taking the smaller of the third limited current and the first limited current as the first preset current value, the DC power supply can be further prevented from being current-limited and causing power failure and reset problems when the DC power supply briefly operates in an environment exceeding the rated current or power.

[0053] To further ensure the safe operation of the DC power supply, in another specific embodiment of the present application, the second determination unit includes a second acquisition module, a third determination module, and a fourth determination module, wherein the second acquisition module is configured to obtain the second limited power and the second limited current when the actual output current exceeds the rated current and persists for a second period of time; the third determination module is configured to determine the ratio of the second limited power to the actual output voltage as a fourth limited current; and the fourth determination module is configured to determine the smaller of the fourth limited current and the second limited current as the second preset current value. After the DC power supply operates for a certain period of time exceeding the rated power and rated current, the smaller of the fourth limited current and the second limited current is taken as the second preset current value, and the actual output current is subsequently adjusted based on the second preset current value, thereby further ensuring that the power supply can operate within the rated value range, thereby further ensuring the safety of the DC power supply.

[0054] According to another specific embodiment of the present application, the adjustment unit includes a fifth determination module, a third acquisition module, a sixth determination module, and an adjustment module, wherein the fifth determination module is configured to determine a first adjustment amount for the power level based on the actual output current and the first preset current value or the second preset current value; the third acquisition module is configured to obtain the rated voltage of the DC power supply; the sixth determination module is configured to determine a second adjustment amount for the power level based on the actual output voltage and the rated voltage; and the adjustment module is configured to adjust the power level only based on the first adjustment amount and the second adjustment amount, so that the adjusted actual output current is less than or equal to the first preset current value or the second preset current value, and the adjusted actual output voltage is less than or equal to the rated voltage. In the above embodiment, when the actual output current is less than the first preset current value or the second preset current value, the actual output voltage is stabilized at the rated voltage through voltage feedback control; when the actual output current is greater than the first preset current value or the second preset current value, the actual output current is limited to the first preset current value or the second preset current value through current feedback control, thereby achieving a constant voltage and current limiting function for the DC power supply.

[0055] In order to further ensure that feedback control of the power supply is implemented relatively simply and quickly, in another specific embodiment of the present application, the above-mentioned fifth determination module includes a first determination submodule and a second determination submodule, wherein the above-mentioned first determination submodule is used to determine that the difference between the above-mentioned first preset current value or the above-mentioned second preset current value and the above-mentioned actual output current is a first difference; the above-mentioned second determination submodule is used to determine that the adjustment amount of the duty cycle and / or period of the above-mentioned power level is the above-mentioned first adjustment amount based on the above-mentioned first difference, and the above-mentioned sixth determination module includes a third determination submodule and a fourth determination submodule, wherein the above-mentioned third determination submodule is used to determine that the difference between the above-mentioned rated voltage and the above-mentioned actual output voltage is a second difference; the above-mentioned fourth determination submodule is used to determine that the adjustment amount of the above-mentioned duty cycle and / or the above-mentioned period is the above-mentioned second adjustment amount based on the above-mentioned second difference.

[0056] Specifically, the adjustment module includes an adjustment submodule, and the adjustment submodule is configured to adjust the power level according to a smaller value between the first adjustment amount and the second adjustment amount.

[0057] The control device of the above-mentioned DC power supply includes a processor and a memory. The above-mentioned acquisition unit, the above-mentioned first determination unit, the above-mentioned second determination unit and the above-mentioned adjustment unit are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize the corresponding functions.

[0058] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be configured, and kernel parameters can be adjusted to address the existing problem of DC power supply current limiting causing device power failure and reset.

[0059] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0060] An embodiment of the present invention provides a computer-readable storage medium having a program stored thereon. When the program is executed by a processor, the above-mentioned direct current power supply control method is implemented.

[0061] An embodiment of the present invention provides a processor, which is used to run a program, wherein the direct current power supply control method is executed when the program is run.

[0062] An embodiment of the present invention provides a device, comprising a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, at least the following steps are performed:

[0063] Step S101, obtaining the actual output current and actual output voltage of the DC power supply;

[0064] Step S102: When the actual output current is less than the rated current of the DC power supply and continues for a first period of time, determining a first preset current value based on the actual output voltage, the first limited power, and the first limited current, wherein the first limited power is a preset power value and is greater than the rated power of the DC power supply, and the first limited current is a preset current value and is greater than the rated current;

[0065] Step S103: When the actual output current is greater than the rated current and lasts for a second period of time, determining a second preset current value based on the actual output voltage, the second limited power, and the second limited current, wherein the second limited power is a preset power value and is less than or equal to the rated power, and the second limited current is a preset current value and is less than or equal to the rated current;

[0066] Step S104 , adjusting the power level at least according to the actual output current and the first preset current value or the second preset current value, so that the adjusted actual output current is less than or equal to the first preset current value or the second preset current value.

[0067] The devices in this article can be servers, PCs, PADs, mobile phones, etc.

[0068] The present application also provides a computer program product, which, when executed on a data processing device, is adapted to execute a program for initializing at least the following method steps:

[0069] Step S101, obtaining the actual output current and actual output voltage of the DC power supply;

[0070] Step S102: When the actual output current is less than the rated current of the DC power supply and continues for a first period of time, determining a first preset current value based on the actual output voltage, the first limited power, and the first limited current, wherein the first limited power is a preset power value and is greater than the rated power of the DC power supply, and the first limited current is a preset current value and is greater than the rated current;

[0071] Step S103: When the actual output current is greater than the rated current and lasts for a second period of time, determining a second preset current value based on the actual output voltage, the second limited power, and the second limited current, wherein the second limited power is a preset power value and is less than or equal to the rated power, and the second limited current is a preset current value and is less than or equal to the rated current;

[0072] Step S104 , adjusting the power level at least according to the actual output current and the first preset current value or the second preset current value, so that the adjusted actual output current is less than or equal to the first preset current value or the second preset current value.

[0073] According to another aspect of an embodiment of the present invention, a DC power supply system is further provided, comprising a DC power supply and a controller, wherein the DC power supply comprises a power stage; and the controller is configured to execute any one of the above methods.

[0074] The above-mentioned DC power supply system includes a DC power supply with a power stage and a controller, and the above-mentioned controller can execute any of the above-mentioned methods. Compared with the current feedback control loop within the DC power supply in the prior art, which stabilizes the output current based on a fixed limiting current, resulting in an output voltage drop during instantaneous current limiting, causing problems such as device power failure and reset, the above-mentioned DC power supply system of the present application takes into account that the power device can withstand a current value far greater than the rated current for a short time. Through the above-mentioned method, different limiting currents are obtained according to the above-mentioned actual output current, the above-mentioned rated current, the above-mentioned first duration, and the second duration, and then the output current is stabilized according to the different limiting currents, ensuring that the DC power supply will not operate in an environment exceeding the rated current or exceeding the rated power for a long time, thereby ensuring the safety of the DC power supply. At the same time, dynamic setting of the current limit value is achieved, ensuring that the power device can instantaneously operate in an environment exceeding the rated current or exceeding the rated power, thereby avoiding problems such as device power failure and reset caused by instantaneous current limiting, and ensuring the better performance of the DC power supply system.

[0075] In actual application, the controller may be an MCU or a DSP.

[0076] In actual application, the control principle diagram of the above DC power supply can be as follows Figure 3 As shown, first, the rated current and rated voltage of the DC power supply are set; then, the rated current and the actual output current are respectively input into the first subtractor 100 to obtain a first difference between the rated current and the actual output current, and the first difference is used as the input of the first PID regulator 101, and the first PID regulator 101 outputs a first adjustment amount according to the first difference; the rated voltage and the actual output voltage are respectively input into the second subtractor 102 to obtain a second difference between the rated voltage and the actual output voltage, and the second difference is used as the second adjustment amount. The first PID regulator 103 is input to the PID regulator 103, and the second PID regulator 103 outputs a second control variable according to the second difference; then, the first control variable and the second control variable are input to the first selection switch 104, and the first selection switch 104 compares and outputs the smaller value of the first control variable and the second control variable to the power stage 105 to adjust the power stage 105, wherein the power stage 105 is used to connect to the load 200, so as to limit the adjusted actual output voltage to the rated voltage, and limit the adjusted actual output current to the rated current. Figure 3 The corresponding IV curves of actual output current and actual output voltage are as follows: Figure 4 However, since the power device itself can withstand a current far greater than the rated current for continuous operation in a short period of time, that is, when the operating parameters of the power device are greater than the rated current or rated power in a short period of time, it will not affect the safety of the power device. Figure 3 The feedback control function of the DC power supply will cause the output voltage to drop when the load (such as a motor, solenoid valve, etc.) has a short-term surge current, which will cause other equipment to lose power or reset.

[0077] In order to solve the above problems, a specific embodiment of the present application proposes a control method for an instantaneous high-rate current output power supply, which realizes the change of peak power limit and peak current limit by dynamic control, so that the DC power supply can instantaneously output power and current values that are multiple times the rated value without damaging the DC power supply. The control principle block diagram is shown in FIG. Figure 5 As shown, by limiting both the maximum peak power value and the peak power operation time, it is possible to achieve instantaneous output power and current without damaging the power device. The detailed working principle is as follows. Figure 5 As shown, Irate is the rated current of the DC power supply, Urate is the rated voltage of the DC power supply, Ppeak is the above-mentioned first limited power or the above-mentioned second limited power, Ipeak is the above-mentioned first preset current value or the above-mentioned second preset current value, when the above-mentioned actual output current is less than the rated current of the above-mentioned DC power supply and lasts for a first period of time, Ppeak is assigned to the above-mentioned first limited power, and Ppeak=Urate×Irate×2, when the output power exceeds this value, it will be limited to this value, Ipeak is assigned to the above-mentioned first preset current value, and Ipeak=Irate×4, this value can prevent the actual output current value from seriously exceeding the current value that the power device can withstand when the actual output voltage is low, thereby causing damage to the equipment; when the above-mentioned actual output current is greater than the above-mentioned rated current and lasts for a second period of time, Ppeak is assigned to the above-mentioned second limited power, and Ppeak=Urate×Irate, when the output power exceeds this value, it will be limited to this value, Ipeak is assigned to the above-mentioned second preset current value, and Ipeak=Irate. This embodiment includes Figure 3 The control logic shown is as follows: Figure 5 As shown, the first subtractor 100, the first PID regulator 101, the first selection switch 104 and the power stage 105 constitute a current feedback control loop, and the second subtractor 102, the second PID regulator 103, the first selection switch 104 and the power stage 105 constitute a voltage feedback control loop. When the actual output current Io is less than the first preset current or the second preset current Ilimit0, the actual output voltage will be stabilized at the rated voltage Urate by the voltage feedback control loop. When the actual output current Io is greater than Ilimit0, the actual output current will be limited to Ilimit0 by the current feedback control loop. The current feedback control loop and the voltage feedback control loop realize the constant voltage current limiting function. Figure 3 On the basis of Figure 5 A second selector 300, a third selector 301, a fourth selector 302, a delay locked loop 303, a comparator 304, a divider 305 and a multiplier 306 are added, and their connection relationship is as follows: Figure 5 As shown in the figure, the peak power limit and peak current limit can be dynamically changed. The details are as follows:

[0078] In the initial state, Io is less than Irate, the output voltage Uo is equal to Urate, the delay lock loop 303 is in the unlocked state, and the first limited power Ppeak is determined, Ppeak = Urate × Irate × 2, and Ipeak is determined to be the first preset current value, Ipeak = Irate × 4. Therefore, the output of the divider 305 Ilimit1 = Irate × 2, the output of the third selector 301 Ilimit2 = Irate × 4, and the output of the fourth selector 302, that is, the first preset current value Ilimit0, selects the smaller value of the two, so Ilimit0 = Irate × 2.

[0079] When the DC power supply output is connected to a smaller load and the equivalent load resistance R is between Urate / Irate and Urate / (2×Irate), the actual output voltage remains stable and does not drop. Figure 6 The actual output power at this time is greater than the rated power, so it is only allowed to operate in this area for a short time. The actual output current Io and the rated current Irate are used as inputs of the comparator 304. Io>Irate. The comparator 304 outputs a locking signal to the delay lock loop 303. After a certain delay in the delay lock loop 303, the locking signal is input to the second selector 300 and the third selector 301, so that the peak power selection and the peak current selection are switched. After the switching, Ppeak is the second limited power, Ppeak=Urate×Irate, and Ipeak is the second preset current value, Ipeak=Irate. The power supply will operate at Figure 6 In the E area of the IV curve, the actual output current and actual power are within the rated current and rated power range.

[0080] When a large load is connected to the output of the DC power supply, and the equivalent load resistance R is between Urate / (2×Irate) and Urate / (4×Irate), Ppeak is the first power limiter, Ppeak=Urate×Irate×2, and Ilimit1 will be adjusted according to the current actual output voltage Uo, with a maximum value of 4×Irate. For example, if the current impedance is Urate / (3×Irate), and the actual output voltage drops to 0.666×Urate, in order to increase the actual output power, Ilimit1 will increase from 2×Irate to 2.45×Irate, causing the actual output voltage to rise to 0.816×Urate, and the DC power supply will operate at Figure 6 At this time, Io>Irate, the comparator 304 outputs a locking signal to the delay lock loop 303. After a certain delay in the delay lock loop 303, the locking signal is input to the second selector 300 and the third selector 301, so that the peak power selection and the peak current selection are switched. After the switching, Ppeak is the second limited power, Ppeak=Urate×Irate, Ipeak is the second preset current value, Ipeak=Irate, and the DC power supply will work at Figure 6 In the E region of the IV curve shown, the actual output current and actual power are within the rated current and rated power range.

[0081] Figure 7This is a schematic diagram of a DC power supply system for a specific embodiment of the present application. The power stage adopts a half-bridge LLC topology. The controller is a DSP chip U1, which is used to generate the required PWM signals (PWM1A, PWM1B). The period and duty cycle of the PWM signals are directly controlled by the program in U1. The two complementary PWM signals with a duty cycle of 50% generated by U1 are isolated and enhanced by the driving capability of the driver chip U2. They drive the complementary opening and closing of the upper and lower MOS transistors in a bridge arm, forming a high-voltage square wave signal with the required frequency and pulse width at the midpoint of the bridge arm. This high-voltage square wave signal then passes through the LLC circuit composed of capacitor Cr, inductor Lr, and transformer T1. The secondary output of T1 has a similar frequency and a nearly sinusoidal voltage. After being rectified by diodes D2 and D4, a DC voltage containing high-frequency components is obtained. This DC voltage is then filtered by a filter composed of capacitors C2 to C9 and inductor L1, and the DC voltage is finally obtained at the output terminal Out. The output voltage, Out+, passes through a low-pass filter and attenuation circuit consisting of resistors R14, R19, and capacitor C27 before being sent to pin 3 of operational amplifier U3A. U3A performs voltage tracking on this voltage and outputs it from pin U3-1. The output voltage then passes through a low-pass filter consisting of resistor R16 and capacitor C26 before being sent to pin 18 of U1 for analog-to-digital conversion. This digital output voltage becomes the input for the voltage feedback control program, i.e., the actual input voltage. The output current is converted into a weak voltage signal by shunts Shunt1 and Shunt2. This signal is then converted into a larger voltage signal by a differential amplifier and filter circuit consisting of operational amplifier U3B, capacitors R6, R7, R8, R12, and capacitors C13 and C14, and then output from pin U3-7. It is then filtered by a low-pass filter consisting of resistor R10 and capacitor C16 before being sent to pin 15 of U1. This voltage signal is converted into a digital signal by U1's internal ADC module and becomes the input for the current feedback control program, i.e., the actual input current.

[0082] In the above embodiments of the present invention, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0083] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the above-mentioned units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0084] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0085] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0086] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the above-mentioned methods of each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0087] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0088] 1) In the control method of the DC power supply of the present application, first, the actual output current and the actual output voltage of the DC power supply are obtained; then, when the actual output current is less than the rated current of the DC power supply and lasts for a first period of time, a first preset current value is determined based on the actual output voltage, the first limited power, and the first limited current; when the actual output current is greater than the rated current and lasts for a second period of time, a second preset current value is determined based on the actual output voltage, the second limited power, and the second limited current, wherein the first limited power is greater than the rated power of the DC power supply, the second limited power is less than the rated power, the first limited current is greater than the rated current, and the second limited current is less than or equal to the rated current; finally, the power level is adjusted based on at least the actual output current and the first preset current value or the second preset current value to stabilize the output current. Compared with the existing technology, the current feedback control loop inside the DC power supply stabilizes the output current according to a fixed limiting current, which causes the output voltage to drop during instantaneous current limiting, resulting in problems such as device power failure and reset. The above method of the present application takes into account that the power device can withstand a current value far greater than the rated current for a short time, and obtains different limiting currents according to the above actual output current, the above rated current, the above first time duration and the second time duration, and then stabilizes the output current according to different limiting currents, ensuring that the DC power supply will not operate for a long time in an environment exceeding the rated current or exceeding the rated power, thereby ensuring the safety of the DC power supply. At the same time, it realizes the dynamic setting of the current limiting value, ensuring that the power device can instantaneously operate in an environment exceeding the rated current or exceeding the rated power, thereby avoiding problems such as device power failure and reset caused by instantaneous current limiting.

[0089] 2) In the control device of the DC power supply of the present application, the actual output current and the actual output voltage of the DC power supply are obtained by the acquisition unit; when the actual output current is less than the rated current of the DC power supply and lasts for a first period of time, the first determination unit determines a first preset current value based on the actual output voltage, the first limiting power and the first limiting current; when the actual output current is greater than the rated current and lasts for a second period of time, the second determination unit determines a second preset current value based on the actual output voltage, the second limiting power and the second limiting current, wherein the first limiting power is greater than the rated power of the DC power supply, the second limiting power is less than the rated power, the first limiting current is greater than the rated current, and the second limiting current is less than or equal to the rated current; the adjustment unit adjusts the power level at least according to the actual output current and the first preset current value or the second preset current value to stabilize the output current. Compared with the existing technology, the current feedback control loop inside the DC power supply stabilizes the output current according to a fixed limiting current, which causes the output voltage to drop during instantaneous current limiting, resulting in problems such as device power failure and reset. The above method of the present application takes into account that the power device can withstand a current value far greater than the rated current for a short time, and obtains different limiting currents according to the above actual output current, the above rated current, the above first time duration and the second time duration, and then stabilizes the output current according to different limiting currents, ensuring that the DC power supply will not operate for a long time in an environment exceeding the rated current or exceeding the rated power, thereby ensuring the safety of the DC power supply. At the same time, it realizes the dynamic setting of the current limiting value, ensuring that the power device can instantaneously operate in an environment exceeding the rated current or exceeding the rated power, thereby avoiding problems such as device power failure and reset caused by instantaneous current limiting.

[0090] 3) The DC power supply system of the present application includes a DC power supply with a power stage and a controller, and the controller can execute any of the above methods. Compared with the current feedback control loop in the DC power supply of the prior art, which stabilizes the output current according to a fixed limiting current, resulting in a drop in the output voltage during instantaneous current limiting, causing problems such as power failure and reset of the device, the DC power supply system of the present application takes into account that the power device can withstand a current value far greater than the rated current for a short time. Through the above method, different limiting currents are obtained according to the actual output current, the rated current, the first duration, and the second duration, and then the output current is stabilized according to the different limiting currents, ensuring that the DC power supply will not operate for a long time in an environment exceeding the rated current or exceeding the rated power, thereby ensuring the safety of the DC power supply. At the same time, the dynamic setting of the current limiting value is realized, ensuring that the power device can instantaneously operate in an environment exceeding the rated current or exceeding the rated power, thereby avoiding problems such as power failure and reset of the device caused by instantaneous current limiting, and ensuring the better performance of the DC power supply system.

[0091] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A method for controlling a DC power supply, wherein the DC power supply comprises a power stage, characterized in that: The method comprises: Obtaining the actual output current and actual output voltage of the DC power supply; When the actual output current is less than the rated current of the DC power supply and lasts for a first period of time, determining a first preset current value based on the actual output voltage, the first limited power, and the first limited current, wherein the first limited power is a preset power value and is greater than the rated power of the DC power supply, and the first limited current is a preset current value and is greater than the rated current; When the actual output current is greater than the rated current and lasts for a second period of time, determining a second preset current value according to the actual output voltage, a second limited power, and a second limited current, wherein the second limited power is a preset power value and is less than or equal to the rated power, and the second limited current is a preset current value and is less than or equal to the rated current; adjusting the power level at least according to the actual output current and the first preset current value or the second preset current value, so that the adjusted actual output current is less than or equal to the first preset current value or the second preset current value; When the actual output current is less than the rated current of the DC power supply and lasts for a first period of time, determining a first preset current value based on the actual output voltage, the first limiting power, and the first limiting current, including: when the actual output current is less than the rated current and lasts for the first period of time, obtaining the first limiting power and the first limiting current; determining that a ratio of the first limiting power to the actual output voltage is a third limiting current; and determining that the smaller value of the third limiting current and the first limiting current is the first preset current value.

2. The method according to claim 1, characterized in that When the actual output current is greater than the rated current and lasts for a second period of time, determining a second preset current value according to the actual output voltage, the second limited power, and the second limited current includes: When the actual output current is greater than the rated current and lasts for a second period of time, obtaining the second limited power and the second limited current; determining a ratio of the second limited power to the actual output voltage as a fourth limited current; The smaller value between the fourth limiting current and the second limiting current is determined as the second preset current value.

3. The method according to claim 1 or 2, characterized in that Adjusting the power level at least based on the actual output current and the first preset current value or the second preset current value so that the adjusted actual output current is less than or equal to the first preset current value or the second preset current value includes: determining a first adjustment amount of the power level according to the actual output current and the first preset current value or the second preset current value; Obtaining the rated voltage of the DC power supply; determining a second adjustment amount of the power level according to the actual output voltage and the rated voltage; According to the first adjustment amount and the second adjustment amount, the power level is adjusted so that the adjusted actual output current is less than or equal to the first preset current value or the second preset current value, and the adjusted actual output voltage is less than or equal to the rated voltage.

4. The method according to claim 3, characterized in that Determining a first adjustment amount of the power level according to the actual output current and the first preset current value or the second preset current value includes: Determining a difference between the first preset current value or the second preset current value and the actual output current as a first difference; Determining, according to the first difference, an adjustment amount of the duty cycle and / or period of the power level as the first adjustment amount, and determining, according to the actual output voltage and the rated voltage, a second adjustment amount of the power level, comprising: determining that a difference between the rated voltage and the actual output voltage is a second difference; According to the second difference, an adjustment amount of the duty cycle and / or the period is determined as the second adjustment amount.

5. The method according to claim 3, characterized in that Adjusting the power level according to the first adjustment amount and the second adjustment amount includes: The power level is adjusted according to a smaller value between the first adjustment amount and the second adjustment amount.

6. A control device for a DC power supply, the DC power supply comprising a power stage, characterized in that: The device comprises: an acquisition unit, configured to acquire an actual output current and an actual output voltage of the DC power supply; a first determining unit, configured to determine a first preset current value based on the actual output voltage, a first limited power, and a first limited current when the actual output current is less than the rated current of the DC power supply and lasts for a first period of time, wherein the first limited power is a preset power value and is greater than the rated power of the DC power supply, and the first limited current is a preset current value and is greater than the rated current; a second determining unit, configured to determine a second preset current value based on the actual output voltage, a second limited power, and a second limited current when the actual output current is greater than the rated current and lasts for a second period of time, wherein the second limited power is a preset power value and is less than or equal to the rated power, and the second limited current is a preset current value and is less than or equal to the rated current; an adjusting unit, configured to adjust the power level at least according to the actual output current and the first preset current value or the second preset current value, so that the adjusted actual output current is less than or equal to the first preset current value or the second preset current value; The first determination unit includes a first acquisition module, a first determination module, and a second determination module, wherein the first acquisition module is used to obtain the first limiting power and the first limiting current when the actual output current is less than the rated current and lasts for the first duration; the first determination module is used to determine that the ratio of the first limiting power to the actual output voltage is a third limiting current; and the second determination module is used to determine that the smaller value of the third limiting current and the first limiting current is the first preset current value.

7. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored program, wherein the program executes the method according to any one of claims 1 to 5.

8. A processor, characterized in that: The processor is configured to run a program, wherein the program executes the method according to any one of claims 1 to 5 when running.

9. A DC power supply system, characterized in that: include: DC power supply, including power stage; A controller for executing the method according to any one of claims 1 to 5.

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