Multi-level load uninterruptible power supply protection technology

Abstract

To provide a power supply device that supplies power to a load and a method for controlling the power supply device.SOLUTION: A power supply device includes a control unit, a first power supply, a second power supply, and a composite switch. The first power supply is connected to the second power supply and the output end of the power supply device through the composite switch, and the second power supply is connected to the output end of the power supply device. The second power supply includes a plurality of energy storage units and at least one adjustment switch of the second power supply, changes the connection relationship between the plurality of energy storage units by adjusting the ON / OFF state of at least one adjustment switch of the second power supply, and outputs a voltage having a different level to the second power supply.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present disclosure relates to the field of power supply technology, and more particularly to a power supply device and a control method. [Background technology]

[0002] With the emergence of new energy sources, aluminum electrolytic capacitors, an important component, are also facing a rapidly increasing market demand. The quality of aluminum electrolytic capacitors, especially their high-voltage resistance, is highly dependent on the quality of the oxide film on the anodized aluminum foil. Controlling the growth of the oxide film on the aluminum foil surface is an extremely precise process, and it is difficult to produce an anodized film that meets the requirements through a single chemical formation. Current high-voltage anodized foil production often uses multi-stage ultra-high-voltage chemical formation technology, in which the voltage in the chemical formation bath is increased in stages to gradually grow the anodized film to a level that can withstand high voltages.

[0003] However, multi-stage high-pressure chemical conversion is a serial process, and chemical conversion is a time-sensitive chemical process. As shown in Figure 1, if a power failure occurs in one of the chemical conversion tanks, the entire chemical conversion process will stop. The aluminum foil in the chemical conversion tank will be shredded and discarded, resulting in a waste of raw materials. Losses from a single shutdown could amount to 50,000 to 100,000 RMB. Furthermore, the chemical conversion process is just one step in the overall production process. If a power outage in one chemical conversion tank causes the other processes to stop, they will continue to idle, resulting in equipment losses and energy waste, both of which increase the economic losses caused by the power outage. To prevent a power outage in a chemical conversion tank, it is essential to provide a backup power source for the chemical conversion production line.

[0004] However, in a multi-stage chemical production line, the voltages of different chemical baths are different, so it is not possible to supply power to all loads using a common bus. In the prior art, each chemical bath needs to be provided with a main power supply and a corresponding backup power supply. While this can functionally meet the needs of uninterruptible power supply, the number of backup power supplies is too high, and the hardware and software costs are too high.

[0005] It should be noted that the information disclosed in the above background art is intended solely to enhance understanding of the background of the present disclosure, and may therefore include information that does not constitute prior art known to those skilled in the art. Summary of the Invention [Means for solving the problem]

[0006] The present disclosure provides a power supply apparatus and control method that at least partially overcomes the problem in the related art of needing to inject too many backup power supplies into a multi-stage chemical conversion production line, resulting in uneconomical hardware costs and software overhead.

[0007] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.

[0008] According to a first aspect of the present disclosure, there is provided a power supply apparatus for supplying power to a load.

[0009] a control unit, a first power source, a second power source, and a compound switch; the first power supply is connected to the second power supply and an output terminal of the power supply device via the composite switch, and the second power supply is connected to an output terminal of the power supply device; The second power supply includes a plurality of energy storage units and at least one second power supply adjustment switch, and the connection relationship between the plurality of energy storage units is changed by adjusting the on / off of the at least one second power supply adjustment switch, so that the second power supply outputs voltages of different levels; The control unit determines whether a fault exists in the load based on the voltage detection signal, and if a fault exists in the load, adjusts the output voltages of the first power source and the second power source to a required voltage of the faulty load, and controls the composite switch to be turned on when an adjustment time required for the first power source is equal to or longer than an adjustment time required for the second power source, and the output voltage of the first power source is adjusted to the required voltage of the faulty load; The voltage detection signal includes required voltage information of the faulty load.

[0010] In some embodiments of the present disclosure, adjusting the output voltage of the first power supply to the required voltage of the faulty load is performed such that the difference between the output voltage of the first power supply and the required voltage of the faulty load is within a preset threshold.

[0011] In some embodiments of the present disclosure, the power supply device further includes an output switch unit; the output switch unit is connected between the composite switch and an output end of the power supply device, and an input end of the output switch unit is connected to the second power supply and the composite switch; The power supply device has N output terminals, and the output switch unit has N output terminals; Here, the N output terminals of the power supply device are connected to the N output terminals of the output switch unit in a one-to-one correspondence, respectively.

[0012] In some embodiments of the present disclosure, the output switch unit includes at least N output switch subunits, each of which includes a first end and a second end, the first ends of the N output switch subunits are respectively connected to input ends of the output switch unit, and when there are N loads, the second ends of the N output switch subunits are respectively connected to N loads in a one-to-one correspondence, and the second ends of the N output switch subunits are N output ends of the output switch unit.

[0013] In some embodiments of the present disclosure, the control unit is configured to control, based on the voltage detection signal, to turn on the output switch subunit corresponding to the faulty load among the N output switch subunits.

[0014] In some embodiments of the present disclosure, the output switch subunit includes a first output switch and a voltage adjustment resistor connected in series with the first output switch; Here, the voltage adjusting resistor is for adjusting the output voltage of the power supply device.

[0015] In some embodiments of the present disclosure, the output switch subunit further includes a second output switch, and the second output switch is connected in parallel to both ends of a series-connected branch circuit consisting of the first output switch and the voltage adjustment resistor; Here, the first output switch is an electronic switch, and the second output switch is a mechanical switch.

[0016] In some embodiments of the present disclosure, the power supply device further includes a flexible power supply, which is for fine-tuning the output voltage of the power supply device.

[0017] In some embodiments of the present disclosure, the flexible power supply is connected in series with at least one of the energy storage units.

[0018] In some embodiments of the present disclosure, the flexible power supply is connected in series between the first end of at least one output switch sub-unit and the input end of the output switch unit.

[0019] In some embodiments of the present disclosure, the first power supply includes at least two sub-power supplies and a first power supply adjustment switch connected to the sub-power supplies; The control unit adjusts the first power supply adjustment switch to turn on or off based on the voltage detection signal, thereby adjusting the output voltage of the first power supply.

[0020] In some embodiments of the present disclosure, the first power supply is a switching power supply.

[0021] In some embodiments of the present disclosure, the power supply device further includes a detection unit; The detection unit is for generating a voltage detection signal, determining a required voltage of the faulty load when a load fault is detected, and transmitting a fault recovery signal when it is detected that the fault has been eliminated.

[0022] In some embodiments of the present disclosure, the compound switch includes a static switch and a bypass switch, and the static switch and the bypass switch are connected in parallel.

[0023] According to a second aspect of the present disclosure, there is further provided a power supply system, comprising the power supply device of the first aspect and an output switch unit, wherein an input terminal of the output switch unit is connected to an output terminal of the power supply device, and N output terminals of the output switch unit are connected to N loads.

[0024] According to a third aspect of the present disclosure, there is provided a control method for a power supply device that is applicable to the above-described power supply device, the control method for the power supply device comprising: a short-time output stage, in which the composite switch is controlled to an off state, the output voltage of the second power supply is adjusted to a voltage required by the fault load, the fault load is supplied with power via the second power supply, and the first power supply is controlled to adjust the output voltage of the first power supply to the voltage required by the fault load; and a stabilizing output stage, in which the output voltage of the first power supply has already been adjusted to the required voltage of the fault load, and the composite switch is controlled to be turned on to supply power to the fault load via the first power supply.

[0025] In some embodiments of the present disclosure, the power supply device further includes an output switch unit; the output switch unit is connected between the composite switch and an output end of the power supply device, and an input end of the output switch unit is connected to the second power supply and the composite switch; Accordingly, a method for controlling a power supply device is provided, comprising: When the control unit receives a fault recovery signal, the power supply device further includes entering a reset stage; In the reset stage, the output switch unit and the composite switch are controlled to be kept off, the output voltage of the first power supply is adjusted to a standby voltage, and the adjustment switch of the second power supply is adjusted to a standby state.

[0026] In some embodiments of the present disclosure, a control method for a power supply device is provided, further comprising a charge / discharge stage: In the charging / discharging stage, the output switch unit is controlled to be turned off and the composite switch is controlled to be turned on, and when the first power source charges or discharges the second power source to a standby voltage, the composite switch is turned off.

[0027] In some embodiments of the present disclosure, a control method for a power supply device is provided, further comprising a hot standby stage: In the hot standby stage, the output switch unit and the composite switch are controlled to be kept off.

[0028] Furthermore, in the hot standby stage, if the output voltage of the second power supply is lower / higher than the standby voltage, the power supply device is controlled to enter the charge / discharge stage.

[0029] According to a fourth aspect of the present disclosure, there is further provided an electronic device including a processor and a memory for storing executable instructions for the processor, wherein the processor is configured to perform the power supply control method described in any one of the third aspects above by executing the executable instructions.

[0030] The power supply device provided in the embodiments of the present disclosure includes a first power supply, a second power supply, a control unit, and a composite switch. The control unit adjusts the output voltages of the first and second power supplies and controls the on / off of the composite switch, allowing the power supply device to output the required voltage corresponding to the fault load, thereby adapting to application scenarios in which different loads require different voltages in a multi-stage chemical production line. This allows the multi-stage chemical production line to use only a single backup power supply, reducing the number of backup power supplies and further improving the economy of hardware costs and software overhead.

[0031] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. [Brief explanation of the drawings]

[0032] The drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification serve to explain the principles of the present disclosure. Obviously, the drawings in the following description are merely some embodiments of the present disclosure, and those skilled in the art can derive other drawings from these drawings without creative effort.

[0033] [Figure 1] 1 shows a schematic diagram of a multi-stage high-pressure chemical production line in the related art. [Figure 2] 1 shows a simplified structural schematic diagram of a power supply device according to an embodiment of the present disclosure. [Figure 3] 1 shows a simplified structural schematic diagram of a power supply device according to some embodiments of the present disclosure. [Figure 4] 3 shows a structural schematic diagram of an output switch unit 301 according to some embodiments of the present disclosure. [Figure 5] 1 shows a simplified structural schematic diagram of a compound switch according to some embodiments of the present disclosure. [Figure 6] 1 shows a schematic diagram of the connection relationship of a flexible power supply in a power supply device according to some embodiments of the present disclosure. [Figure 7] 1 shows a schematic diagram of the connections of a flexible power supply in another power supply device according to some embodiments of the present disclosure. [Figure 8] 1 shows a simplified structural schematic diagram of a power supply device according to a further embodiment of the present disclosure; [Figure 9] 1 shows a simplified structural schematic diagram of a power supply system according to an embodiment of the present disclosure. [Figure 10] 3 shows a schematic flow chart of a control method applied to the power supply apparatus shown in FIG. 2 according to an embodiment of the present disclosure. [Figure 11] 1 shows a schematic flow chart of a control method according to some embodiments of the present disclosure. [Figure 12] 10 shows a schematic flowchart of a control method according to another embodiment of the present disclosure. [Figure 13] 10 shows a schematic flowchart of yet another control method according to another embodiment of the present disclosure. [Figure 14] 1 shows a schematic architecture diagram of a multi-stage conversion process power supply system according to an embodiment of the present disclosure. [Figure 15] 1 shows a schematic diagram of a simple connection relationship of a power supply device in a charging state according to an embodiment of the present disclosure. [Figure 16] 1 shows a structural schematic diagram of a simulation circuit consisting of an energy storage unit and a plurality of regulating switches of a second power supply according to an embodiment of the present disclosure. [Figure 17]10 shows a structural schematic diagram of another simulation circuit consisting of an energy storage unit and multiple regulating switches of a second power source according to an embodiment of the present disclosure. [Figure 18] 1 shows a schematic diagram of a simplified connection relationship of a power supply device in a short-time output state according to an embodiment of the present disclosure. [Figure 19] 1 shows a structural schematic diagram of a simulation circuit consisting of multiple sub-power supplies of a first power supply and multiple adjustment switches according to an embodiment of the present disclosure. [Figure 20] 1 illustrates a simplified connection diagram of a power supply device in a stable output state according to an embodiment of the present disclosure. [Figure 21] 10 illustrates voltage curves for two loads restoring power after a power outage according to an embodiment of the present disclosure. [Figure 22] 1 shows a schematic diagram of the change curve of the output voltage of a power supply device according to an embodiment of the present disclosure; DETAILED DESCRIPTION OF THE INVENTION

[0034] Exemplary embodiments are described more fully below with reference to the accompanying drawings. However, exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0035] Furthermore, the drawings are merely schematic diagrams of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings indicate the same or similar parts, and therefore redundant descriptions thereof will be omitted. Some block diagrams shown in the drawings are functional entities that do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and / or processor and / or microcontroller devices.

[0036] Hereinafter, specific embodiments of the present disclosure will be described in detail with reference to the drawings.

[0037] The inventors have discovered that in order to minimize economic losses due to production stoppages in multi-stage chemical production lines, it is necessary to provide a power supply architecture for uninterruptible power supply for multi-stage chemical production lines, including at least a backup power supply and an operating power supply. Considering that the backup power supply must be used promptly when the operating power supply fails, the backup power supply can include a temporary power supply and a long-term power supply. The temporary power supply can be, for example, a battery or a supercapacitor, and can respond quickly to a power failure and temporarily provide a support voltage using a static switch or a converter. The long-term power supply can be, for example, a commercial power supply or a diesel generator, and can provide electrical energy using a mechanical switch, has a slow response speed, and can maintain long-term operation.

[0038] Based on the above findings, an embodiment of the present disclosure provides a power supply apparatus for supplying power to a load, which includes a control unit 201, a first power supply 202, a second power supply 203, and a composite switch 204, as shown in FIG.

[0039] The power supply device includes an output terminal for outputting a voltage to a load electrically connected to the power supply device, and a first power supply 202 is connected to a second power supply 203 and the output terminal of the power supply device via a composite switch 204, and the second power supply 203 is connected to the output terminal of the power supply device. That is, a second terminal of the first power supply 202 is connected to a first terminal of the composite switch 204, a second terminal of the composite switch 204 is connected to the output terminal of the power supply device, and a second terminal of the second power supply 203 is connected to the output terminal of the power supply device.

[0040] The second power source 203 includes a plurality of energy storage units and at least one second power source regulating switch, and the connection relationship between the plurality of energy storage units is changed by turning on and off the second power source regulating switch, causing the second power source 203 to output voltages of different levels. Specifically, as shown in FIG. 2 , the second power source 203 includes at least a first energy storage unit 231, a second energy storage unit 232, and a second power source regulating switch 233, and by turning on and off the second power source regulating switch 233, different connection modes of the two energy storage units can be realized to achieve output capabilities of different voltage levels. Note that, when there is a single power supply load, the different levels of voltage output by the second power source 203 may be voltages of different levels corresponding to the single load, and when there are multiple power supply loads, the different levels of voltage output by the second power source 203 may be voltages of different levels corresponding to each load. The control unit 201 determines whether a fault exists in the load based on the received voltage detection signal, and if a fault exists in the load, adjusts the output voltages of the first power source 202 and the second power source 203 to the voltage required by the faulty load, where the adjustment time required for the first power source 202 is equal to or longer than the adjustment time required for the second power source 203, and when the output voltage of the first power source 202 is adjusted to the voltage required by the faulty load, controls the composite switch 204 to be turned on, so that the power supply device provides electrical energy to the faulty load via the first power source 202.

[0041] Here, the voltage detection signal includes information about the required voltage of the faulty load.

[0042] The first power source 202 is a long-term power source, and in specific implementation, it uses a commercial power source as a power source and can adjust the output voltage. When supplying power, the voltage required for a fault load such as a power outage is not constant, so a certain adjustment time is required for the first power source 202 to adjust the output voltage to the corresponding target voltage. During the adjustment period of the first power source 202, the power supply device uses the second power source 203 as a temporary power source to provide electrical energy and provide short-term voltage support for the fault load.

[0043] Note that adjusting the output voltage of the first power supply 202 to the required voltage of the faulty load means that the difference between the output voltage of the first power supply 202 and the required voltage of the faulty load is within a preset threshold, and at this time, the control unit 201 controls the composite switch 204 to be turned on, thereby making the composite switch 204 conductive. That is, when the first power supply 202 is adjusted to be close to the required voltage of the faulty load, if the difference between the output voltage of the first power supply 202 and the required voltage of the faulty load is within the preset threshold, the composite switch 204 is controlled to be turned on, and the first power supply 202 simultaneously supplies power to the second power supply 203 and the faulty load, but when the second power supply 203 is charged to saturation, the first power supply 202 does not supply power to the second power supply 203 but only supplies power to the faulty load, that is, the first power supply 202 directly supplies power to the faulty load.

[0044] In some embodiments of the present disclosure, as shown in FIG. 3 , the power supply device provided further includes an output switch unit 301 in addition to the components shown in FIG. 2 . The output switch unit 301 is connected between the composite switch 204 and the output terminal of the power supply device. The output switch unit 301 includes an input terminal and an output terminal. The input terminal of the output switch unit 301 is connected to the composite switch 204 and the second power source 203. The power supply device has N output terminals, and the output switch unit 301 has N output terminals. Here, the N output terminals of the power supply device are connected in a one-to-one correspondence to the N output terminals of the output switch unit 301, respectively. That is, the input terminals of the output switch unit 301 are connected to the second power source 203 and the composite switch 204, respectively, and the multiple output terminals are the multiple output terminals of the power supply device. Note that the output terminal of the power supply device has multiple ports, for example, including port 1 to port p as shown in FIG. 3 , and is connected to multiple loads in a one-to-one correspondence.

[0045] In some embodiments of the present disclosure, the output switch unit 301 includes at least N output switch subunits, each including a first end and a second end, the first ends of the N output switch subunits being respectively connected to input ends of the output switch unit 301, and the second ends of the N output switch subunits being connected to loads. Specifically, when there are N loads, the second ends of the N output switch subunits are respectively connected to the N loads in a one-to-one correspondence, and the second ends of the N output switch subunits are N output ends of the output switch unit 301. The control unit 201 is used to control an output switch subunit corresponding to a faulty load among the N output switch subunits to be turned on based on the received voltage detection signal. The voltage detection signal includes required voltage information of the faulty load, and the control unit 201 can determine which of one or more loads connected to the power supply device is the faulty load based on the voltage detection signal, and thereby control an output switch subunit corresponding to the faulty load among the N output switch subunits to be turned on so as to supply power to the faulty load.

[0046] Specifically, the output switch sub-unit includes a first output switch and a voltage adjusting resistor connected in series with the first output switch, the voltage adjusting resistor is used to adjust the output voltage of the power supply device, and the first output switch is used to control whether the power supply device outputs power. In a specific implementation, one output switch unit 301 can include multiple output switch sub-units, each including a first output switch and a voltage adjusting resistor, which are connected in series and then connected to different loads in a one-to-one correspondence, and are used to control and adjust the power supply device to supply power to the faulty load.

[0047] In another embodiment of the present disclosure, an electronic switch with a faster response speed can be selected as the output switch so that the second power source 203 can quickly supply electrical energy to a faulty load. Furthermore, if the first power source 202 serves as a long-term power source and supplies electrical energy for a long time, a mechanical switch with a lower loss can be selected as the output switch to reduce switch losses. Therefore, the output switch subunit further includes a second output switch, which is connected in parallel to both ends of a series-connected branch circuit consisting of the first output switch and the voltage adjustment resistor. The first output switch is an electronic switch, and the second output switch is a mechanical switch. Specifically, the second end of the first output switch is connected to the first end of the voltage adjustment resistor. The first end of the second output switch is connected to the first end of the first output switch, and the second end of the second output switch is connected to the second end of the voltage adjustment resistor. In a specific implementation, as shown in FIG. 4, one output switch unit 301 may include multiple output switch sub-units 401, and each output switch sub-unit 401 includes a first output switch 411, a second output switch 412, and a voltage adjustment resistor 413. The first output switch 411 and the voltage adjustment resistor 413 are connected in series, and then the entire series-connected circuit is connected in parallel to the second output switch 412, and further connected to the load in a one-to-one correspondence, for controlling and adjusting the power supply device to supply power to the faulty load.

[0048] In some embodiments of the present disclosure, the first power supply 202 includes at least two sub-power supplies and a first power supply regulating switch connected to the sub-power supplies. By turning the first power supply regulating switch on or off, the first power supply 202 can output different voltages to meet the voltage range corresponding to multiple loads, or can quickly adjust to a target voltage corresponding to one or several loads when the distribution width between the voltages corresponding to the multiple loads is too large. In a specific implementation, by setting the connection relationship between the first power supply regulating switch and the multiple sub-power supplies, multiple output terminals are drawn, and the voltage output from one output terminal is equal to the voltage corresponding to one load. Thus, m sub-power supplies can be used to quickly output M different voltages, where m is generally less than M. Furthermore, the control unit 201 adjusts the first power supply regulating switch to be on or off based on the received voltage detection signal, thereby regulating the output voltage of the first power supply 202. Using multiple sub-power sources and a first power supply adjustment switch, the first power supply 202 is preset to output a voltage corresponding to the voltage required by the load, and a control signal is sent by the control unit 201 to control the adjustment switch, thereby reducing the time required to adjust the output voltage of the first power supply 202 to the set voltage value. In some embodiments, the first power supply 202 is a switching power supply, i.e., the first power supply 202 is a continuously adjustable power supply whose output voltage can be adjusted by adjusting the switching frequency or duty cycle, such as a resonant converter, a buck converter, or a PFC (power factor correction) converter. As will be understood by those skilled in the art, the above types of first power supply 202 are merely examples and do not limit the scope of protection of the present disclosure.

[0049] In some embodiments of the present disclosure, the second power source 203 is an adjustable power source that can output a set of specific voltage level combinations in a discontinuously adjustable manner. In addition to including a first energy storage unit 231 and a second energy storage unit 232, the second power source 203 can also include a third energy storage unit, a fourth energy storage unit, ..., a jth energy storage unit. That is, the second power source 203 includes at least two energy storage units, and the energy storage units and the regulating switch 233 of the second power source form an energy storage network. By controlling the on / off of the regulating switch 233 of the second power source, the multiple energy storage units can be connected in parallel, series, or series-parallel, thereby allowing the second power source 203 to output different voltages. In a specific implementation, the different voltage levels of the multiple loads can be statistically calculated in advance to determine the greatest common denominator of the different voltage levels of the multiple loads, and the output voltage value of each energy storage unit can be determined accordingly. Furthermore, the connection relationship of the regulating switches is designed, and the number of regulating switches 233 of the second power supply and the connection relationship between them and the energy storage units are determined, so that the regulating switches 233 of the second power supply arrange and combine multiple energy storage units to obtain output voltages that are different multiples of the output voltage value of a single energy storage unit.

[0050] In some embodiments of the present disclosure, the compound switch 204 includes a static switch and a bypass switch, which are connected in parallel. In a specific embodiment, as shown in FIG. 5, a simplified structural schematic diagram of the compound switch 204 includes a bypass switch and a static switch connected in parallel. Generally, the bypass switch is a mechanical switch and the static switch is an electronic switch. When the compound switch 204 is turned on, the static switch is turned on first, then the bypass switch is turned on, and finally the static switch is turned off. Before the compound switch 204 is turned off, the static switch is turned on first, then the bypass switch is turned off, and finally the static switch is turned off, thereby avoiding the mechanical switch being directly connected to the circuit and causing a voltage or current surge.

[0051] In a specific implementation, due to factors such as losses, the multiple output voltages obtained by connecting the multiple energy storage units to the second power supply's adjustment switch 233 may have a certain error with the different voltage levels of the multiple loads. Alternatively, it may be difficult to determine the greatest common denominator of the different voltage levels of the multiple loads, or the determined greatest common denominator may be too small, resulting in a large number of required energy storage units, a complex circuit structure, and increased hardware costs. In a specific implementation, the output voltage value of each energy storage unit may be set based on the difference between the different voltage levels of the multiple loads. For example, if the difference between the different voltage levels of the multiple loads is approximately 80 V, the output voltage value of each energy storage unit may be set to 80 V. Alternatively, an energy storage unit with a common capacity may be used, e.g., an energy storage unit with an output voltage of 50 V may be selected. However, in such an installation, the multiple output voltages obtained through the connection switch network of the multiple energy storage units may have a certain error with the different voltage levels of the multiple loads. To reduce this error, some embodiments of the present disclosure further include a flexible power supply in the power supply device, which fine-tunes the output voltage of the power supply device to correct the error. In some embodiments of the present disclosure, as shown in Figure 6, the flexible power supply is connected in series with at least one energy storage unit. Specifically, the flexible power supply is located in the second power supply 203 and connected in series with one or more energy storage units, and can adjust the voltage of the multiple outputs of the second power supply 203 including the one or more energy storage units, so that the power supply device can provide an accurate voltage to a faulty load. In a specific implementation, the output voltage of the flexible power supply and the connected energy storage units can be predetermined based on the output capacity of the second power supply 203 and the required voltage of the load, so that the second power supply 203 can provide a more flexible output voltage.In another embodiment of the present disclosure, as shown in Figure 7, a flexible power supply is connected in series between the first end of at least one output switch sub-unit and the input end of the output switch unit 301, thereby adjusting the voltage output from the output end of one or more power supplies connected in series to the flexible power supply. For example, as shown in Figure 7, the voltage required for load 2 is 880V, but the closest voltage levels that the second power supply 203 can provide are only 850V and 900V, with a difference of 30V or 20V. In this case, one flexible power supply can be connected in series between the output switch sub-unit connected to load 2 and the output end of the second power supply 203, and the flexible power supply can be set to output a voltage of 30V or 20V, thereby ensuring that the output end of port 2 of the power supply device can output a voltage of 880V to load 2.

[0052] In a specific implementation, the above errors are analyzed to determine the error distribution range corresponding to each output, and the distribution range of the output voltage of the flexible power supply is determined based on this range, and the output voltage of the flexible power supply can be set. If the distribution range of the output voltage of the flexible power supply is small, the output voltage of the flexible power supply can be set to a fixed value to simplify the control process and reduce the power supply response time of the power supply device, which further reduces the output response time of the second power supply 203 without affecting the accuracy of the output voltage of the second power supply 203, resulting in a shorter power outage time of the fault load and reduced losses.

[0053] In some embodiments of the present disclosure, as shown in FIG. 8 , in addition to FIG. 3 , a detection unit 801 is further included. The detection unit 801 generates a voltage detection signal, determines the required voltage of the faulty load when a load fault is detected, and sends a fault recovery signal to the control unit when the fault is resolved. Specifically, the detection unit 801 detects the status of multiple loads, determines the required voltage of the faulty load when a load outage is detected, and generates a voltage detection signal based on the required voltage of the faulty load. When the load fault is resolved, that is, after the existing power supply restores power supply to the load, the detection unit 801 generates a fault recovery signal and sends it to the control unit. The power supply is respectively connected to the multiple loads via the output switch unit 301. After receiving the voltage detection signal, the output switch unit 301 connects the power supply to the faulty load to transmit electrical energy. After receiving the fault recovery signal, the detection unit 801 disconnects the connection between the power supply and the faulty load. In a specific implementation, the control unit 201 further controls the on or off of the first output switch and / or the second output switch according to the voltage detection signal or the fault recovery signal, thereby connecting or disconnecting the power supply device to the fault load. As can be understood by those skilled in the art, the detection unit 801 can be installed independently or integrated into the control unit 201, and the present disclosure is not limited thereto.

[0054] As can be seen from the above, the power supply device according to the embodiment of the present disclosure includes the following operating states.

[0055] Short-time output state: When the second power supply 203 outputs, the first power supply 202 is disconnected from the second power supply 203, and the second power supply regulating switch 233 of the second power supply 203 is adjusted to output the target voltage corresponding to the voltage required by the current fault load, and the output voltage is more accurately adjusted by the voltage regulating resistor, and the output switch unit 301 corresponding to the fault load is turned on, so that the second power supply 203 supplies power to the fault load.

[0056] In the short-time output state, the second power supply 203 adjusts its internal connection structure based on the voltage detection signal, and after the voltage required by the faulty load is reached, it turns on the switch corresponding to the faulty load in the output switch unit 301 to supply power to the faulty load. At the same time, the first power supply 202 adjusts its own voltage based on the voltage detection signal.

[0057] Stable output state: After the second power supply 203 outputs electrical energy to support the voltage of the faulty load for a certain period of time, when the output voltage of the first power supply 202 is adjusted to the required voltage of the faulty load, the composite switch 204 is turned on, and the first power supply 202 directly supplies stable power to the faulty load for a long period of time through the composite switch 204 and the output switch unit 301.

[0058] After the voltage regulation of the first power supply 202 is completed, the static switch of the composite switch 204 is turned on to quickly power the load, and then the bypass switch of the composite switch 204 is turned on, and after the bypass switch is fully turned on, the static switch is turned off to realize stable power supply to the load.

[0059] Reset state: In this state, the fault load has already recovered to normal power supply, and the power supply device according to the embodiment of the present disclosure does not need to continue power supply. When the control unit receives the fault recovery signal, the output voltage of the first power supply 202 is adjusted to the standby voltage, and the composite switch 204 and the output switch unit 301 are both in the OFF state. The first power supply 202 is adjusted to the standby voltage, and the energy storage unit and the connection switch in the second power supply 203 need to be set to the standby connection configuration.

[0060] Charge / Discharge State: In this state, the first power supply 202 uses its standby voltage to charge or discharge the second power supply 203 based on the relationship between its standby voltage and the required voltage of the faulty load. Specifically, when the standby voltage of the first power supply 202 is greater than the required voltage of the faulty load, the charging state is entered, the output switch unit 301 is turned off, the bypass switch of the composite switch 204 is turned on, and the first power supply 202 charges the second power supply 203 in the standby connection configuration with its standby voltage. When the standby voltage of the first power supply 202 is less than the required voltage of the faulty load, the discharging state is entered, the output switch unit 301 is turned off, the composite switch 204 is turned on, and the first power supply 202 discharges the second power supply 203 to the standby voltage.

[0061] In a specific implementation, the first power source 202 is a bidirectional power source, and can charge and discharge the second power source 203 .

[0062] Hot standby state: After the second power supply 203 is fully charged, it enters the hot standby state, and the composite switch 204 and the output switch unit 301 are all disconnected. In the hot standby state, the voltage of the second power supply 203 is monitored, and when the voltage is lower than a preset threshold, the composite switch 204 is turned on and the charging state is resumed. In a specific embodiment, the power supply device can remain in the hot standby state for a long time, thereby ensuring that when a load fails, the power supply device can quickly start up and supply power to the failed load.

[0063] As can be seen from the above, the power supply device according to the embodiment of the present disclosure includes first power supply 202, second power supply 203, control unit 201, and composite switch 204. By adjusting the output voltage of first power supply 202 and second power supply 203 using control unit 201 and controlling the on / off of composite switch 204, the power supply device can output voltages of different voltage levels corresponding to multiple loads, thereby adapting to application scenarios in which different loads require different voltages in a multi-stage chemical formation production line. This allows the multi-stage chemical formation production line to use only a single backup power supply, reducing the number of backup power supplies and hardware and software costs, and making the multi-stage chemical formation production line more economical.

[0064] An embodiment of the present disclosure further provides a power supply system based on the same inventive concept. As shown in FIG. 9, the power supply system includes a power supply device 901 and an output switch unit 902. Specifically, the structure of the power supply device 901 is as shown in FIG. 2, where the output switch unit 902 includes an input terminal and at least one output terminal, the input terminal of the output switch unit 902 is connected to the output terminal of the power supply device 901, and N output terminals of the output switch unit 902 are connected to N loads. In a specific implementation, the output switch unit 902 is electrically connected to the control unit 201, and the control unit 201 controls the output terminal of the N output terminals of the output switch unit 902 connected to the faulty load to be turned on based on the received voltage detection signal, thereby connecting the faulty load to the power supply device 901. The internal structure and control logic of the output switch unit 902 can be referenced to the output switch unit 301, and a description thereof will be omitted here.

[0065] As can be seen from the above, the power supply system according to the embodiment of the present disclosure includes a power supply device 901, a first power supply 202, a second power supply 203, a control unit 201, and a composite switch 204. The control unit 201 adjusts the output voltages of the first power supply 202 and the second power supply 203 and controls the on / off of the composite switch 204, allowing the power supply device to output voltages of different levels corresponding to multiple loads. The power supply device also includes an output switch unit 902, each connected to N loads. The control unit 201 receives a voltage detection signal and controls the output switch unit 902 to connect the power supply device 901 to the faulty load, allowing the power supply device 901 to supply power to the faulty load. This accommodates applications in which different loads require different voltages in a multi-stage chemical formation production line. This allows the multi-stage chemical formation production line to use only a single backup power supply, reducing the number of backup power supplies and further reducing hardware and software costs, making the multi-stage chemical formation production line more economical.

[0066] Based on the same inventive concept, the embodiments of the present disclosure further provide a control method applied to a power supply device, as described in the following embodiments. Since the principle of solving the problem of the control method embodiment is similar to that of the power supply device embodiment, the implementation of the control method embodiment can refer to the implementation of the power supply device embodiment, and the overlapping parts will be omitted.

[0067] FIG. 10 illustrates a control method applied to the power supply device shown in FIG. 2 in an embodiment of the present disclosure, which includes the following steps:

[0068] S1002, in the short-time output stage, the composite switch 204 is controlled to be in the OFF state, the output voltage of the second power supply 203 is adjusted to the required voltage of the faulty load, and the faulty load is supplied with power through the second power supply 203, and the first power supply 202 is controlled to adjust the output voltage of the first power supply 202 to the required voltage of the faulty load.

[0069] At this time, the power supply device is in the short-time output state.

[0070] S1004, in the stable output stage, the output voltage of the first power supply 202 has already been adjusted to the required voltage of the fault load, and the composite switch 204 is controlled to be turned on, and power is supplied to the fault load via the first power supply 202.

[0071] At this time, the power supply device is in the stable output state.

[0072] In some embodiments of the present disclosure, the power supply device further includes an output switch unit 301, which is connected between the composite switch 204 and the output end of the power supply device, and the input end of the output switch unit 301 is connected to the second power supply 203 and the composite switch 204. Correspondingly, the control method shown in FIG. 11 further includes the following steps in addition to those shown in FIG. 10:

[0073] S1102: When the control unit 201 receives the fault recovery signal, the power supply enters a reset stage. In the reset stage, the output switch unit 301 and the composite switch 204 are controlled to be kept off, the output voltage of the first power supply 202 is adjusted to a standby voltage, and the adjustment switch 233 of the second power supply is adjusted to a standby state.

[0074] At this time, the power supply is in the reset state. In a specific implementation, the standby voltage is generally set to a preset value. This preset value may be set based on a frequently occurring value in historical data of voltages provided by the power supply, or may be determined based on voltages corresponding to multiple loads, for example, set to the median value of voltages corresponding to multiple loads. In this way, when adjusting the output voltage of the first power supply 202, it can be quickly adjusted to the voltage required by the faulty load, shortening the adjustment time, minimizing the power supply time of the second power supply 203, and enabling uninterrupted power supply to the faulty load.

[0075] In some embodiments of the present disclosure, the control method shown in FIG. 12 further includes the following steps in addition to those in FIG.

[0076] S1202, in the charge / discharge stage, the output switch unit 301 is turned off and the composite switch 204 is controlled to be turned on, and when the first power source 202 charges or discharges the second power source 203 to the standby voltage, the composite switch 204 is turned off.

[0077] At this time, the power supply is in the charging / discharging state. If the standby voltage of the first power supply 202 is greater than the required voltage of the faulty load, the charging stage is entered, the output switch unit 301 is turned off, and the composite switch 204 is controlled to be turned on. When the first power supply 202 charges the second power supply 203 up to the standby voltage, the composite switch 204 is turned off. If the standby voltage of the first power supply 202 is less than the required voltage of the faulty load, the discharging stage is entered, the output switch unit 301 is turned off, and the composite switch 204 is controlled to be turned on. When the first power supply 202 discharges the second power supply 203 down to the standby voltage, the composite switch 204 is turned off.

[0078] In some embodiments of the present disclosure, the control method shown in FIG. 13 further includes the following steps in addition to those in FIG.

[0079] In step S1302, the hot standby stage, the output switch unit 301 and the composite switch 204 are controlled to be kept off.

[0080] At this time, the power supply unit is in the hot standby state.

[0081] Furthermore, the control method provided further includes:

[0082] In the hot standby stage, if the output voltage of the second power supply 203 is lower than the standby voltage, the power supply device is controlled to enter the charging stage, and if it is higher, the power supply device is controlled to enter the discharging stage. Specifically, in the hot standby stage, if the output voltage of the second power supply 203 is lower than the standby voltage, the power supply device is controlled to enter the charging stage. In the hot standby stage, if the output voltage of the second power supply 203 is higher than the standby voltage, the power supply device is controlled to enter the discharging stage.

[0083] To better explain the power supply device and the control method applied to the power supply device according to the embodiment of the present disclosure, a specific example will be described below. The power supply device according to this example is used as a backup power supply in a power supply system for a multi-stage chemical conversion process, as shown in FIG.

[0084] The detection unit detects the side of the multiple series loads and detects the states of the multiple series loads (only three loads are shown in FIG. 14). The output switch unit is connected to the power supply device and the multiple series loads, respectively, and the control unit controls the first power supply, the second power supply, the composite switch, and the output switch unit based on the detection results of the detection unit. The first power supply receives input from a commercial power source as its energy supply source.

[0085] The power supply unit has five operating states as a backup power supply, as shown in Table 1.

[0086] [Table 1]

[0087] In a specific implementation, as shown in FIG. 15, a simplified connection diagram of a power supply device in hot standby mode shows how the first power supply charges the second power supply using a standby voltage of 900V. During charging, the connection switches connect the six energy storage units (capacitors C1-C6) of the second power supply in series, and the first power supply charges each energy storage unit of the second power supply to 150V (ΔV=150V, determined according to the difference between the voltage levels corresponding to the loads). As shown in FIG. 16, this specific example shows a simulation circuit structure consisting of the energy storage units of the second power supply and multiple regulating switches of the second power supply. By designing the regulating switch connection network shown in FIG. 16, the switch connection network can be used to connect capacitors in series, parallel, or series-parallel, allowing the second power supply to output six voltage levels: 150V, 300V, 450V, 600V, 750V, and 900V. As shown in Table 2, when the adjustment switch (S11 to S110) of each second power supply in Fig. 16 is turned off or on, the output voltage value of the corresponding second power supply changes. Note that in Table 2, "1" indicates that the adjustment switch of the second power supply is on, and "0" indicates that the adjustment switch of the second power supply is off.

[0088] [Table 2]

[0089] As shown in Figure 17, this specific example is a structural diagram of another simulation circuit composed of a second power supply energy storage unit and multiple second power supply adjustment switches, and includes six energy storage units (capacitors C7 to C12) and 17 second power supply adjustment switches (S111 to S127).

[0090] As shown in Figure 18, which is a schematic diagram of the simple connection relationship of the power supply device in the short-time output state, the detection unit determines the location of the fault load and the required voltage is 450V, and generates a voltage detection signal. After receiving the voltage detection signal, the control unit controls the switches S12, S13, S15, S17, and S19 of the second power supply shown in Figure 16 to turn on, connecting the six energy storage units in series in groups of three and then in parallel to output a voltage of 450V, and further controls the output switch unit to turn on, so that the second power supply supplies power to the fault load. Furthermore, a control signal is sent to the first power supply to control the output voltage of the first power supply.

[0091] The structure of a simulation circuit consisting of multiple sub-power supplies and multiple regulating switches in the first power supply is shown in Figure 19. By designing a connection network like that shown in Figure 19, the four sub-power supplies can be combined in series, parallel, or series-parallel configurations to obtain four output terminals that can output 15 different voltages. The back end can supply power to loads with up to 15 different voltage levels through the additional output power distribution switches. Table 3 shows the change in the output voltage value of the corresponding first power supply when each of the first power supply regulating switches (S21 to S214) of the first power supply shown in Figure 19 is off or on. In Table 3, "1" indicates that the first power supply regulating switch is on, "0" indicates that the first power supply regulating switch is off, and Y1, Y2, Y3, and Y4 indicate the rated voltages of the four sub-power supplies.

[0092] [Table 3]

[0093] In this embodiment, after the control unit controls the first power supply regulation switch in the first power supply to turn on or off, when the output voltage of the first power supply is 450V, it enters a stable output state.

[0094] As shown in Figure 20, which is a schematic diagram of the simplified connection relationship of the power supply device in a stable output state, the control unit controls the composite switch to be turned on, and the first power supply directly supplies power to the fault load. In order to reduce switch loss, the output electronic switch in the output switch unit shown in Figure 20 is turned off, and the output mechanical switch connected in parallel with it is turned on. Since the first power supply needs to stably supply power to the fault load for a long time, loss and temperature rise must be taken into consideration, and an output mechanical switch with smaller loss and temperature rise is used.

[0095] After the fault is removed, the backup power supply is deactivated and the power supply is reset. Because the voltage level corresponding to the load in this system frequently exceeds 900V, the standby voltage of the first power supply is set to 900V, thereby shortening the voltage regulation time of the first power supply.

[0096] 21 shows the voltage curves for power recovery after a power outage for two loads when a power supply according to an embodiment of the present disclosure is used as a backup power supply. As can be seen from the figure, a fault occurs at 0.4 seconds, and the primary power supply is disconnected from the faulty load. At the same time, the second power supply is configured in the corresponding topology and output to the load. After 3 milliseconds, the voltage regulation of the first power supply is completed, and it is connected to the load, and the second power supply is disconnected. Within the short-term power supply period of 3 milliseconds, the output voltage deviation of the second power supply is less than 10V, with a maximum error of less than 2% relative to the rated voltage. This error is small and within the acceptable range for the process, and the power outage time is very short, significantly reducing losses.

[0097] Figure 22 shows a schematic diagram of the output voltage change curve for this specific embodiment. It can be seen that, in this specific embodiment, the cooperation of the first and second power supplies allows the output voltage of the entire power supply to quickly reach the desired level, significantly shortening the time it takes for the load to experience a power outage or a significant voltage drop, ensuring power supply continuity and the quality of the chemical formation process. Compared with solutions that use independent redundant power supplies for each load, this solution offers greater cost and volume savings, reduces the complexity of the power supply system, and improves reliability. For power supply systems that require multiple power supplies connected in series, such as chemical production lines, installing this power supply as a backup power source can effectively and significantly improve the reliability of the entire power supply system, thereby appropriately relaxing the strict requirements for the reliability of the single power supply in the power supply system and further reducing industrial costs.

[0098] Those skilled in the art will appreciate that various aspects of the present disclosure may be embodied as a system, method, or program product. Accordingly, various aspects of the present disclosure may be embodied as an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.), or an embodiment combining hardware and software, which may be referred to herein as a "circuit," "module," or "system." It should be noted that while the above detailed description refers to several modules or units of equipment for performing operations, such division is not required. In fact, according to embodiments of the present disclosure, the features and functions of two or more modules or units described above may be embodied in a single module or unit. Conversely, the features and functions of a single module or unit described above may be further divided to be embodied by multiple modules or units.

[0099] Furthermore, although various steps of the methods in this disclosure are shown in the figures in a particular order, this does not require or imply that the steps must be performed in a particular order, or that all of the shown steps must be performed, to achieve desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into a single step, and / or a single step may be divided into multiple steps.

[0100] From the above description of the embodiments, those skilled in the art can easily understand that the exemplary embodiments described herein may be realized by software, or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (such as a CD-ROM, a USB memory, a removable hard disk, etc.) or a network, and includes multiple instructions to cause a computing device (such as a personal computer, a server, a mobile terminal, or a network device, etc.) to perform the method according to the embodiments of the present disclosure.

[0101] Other embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration and practice of the specification and invention disclosed herein. The present disclosure is intended to cover any modifications, applications, or adaptations of the present disclosure in accordance with the general principles of the present disclosure, including those within the scope of well-known knowledge or customary technical means in the art that are not disclosed by the present disclosure. The specification and examples are exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

Claims

1. 1. A power supply apparatus for supplying power to a load, comprising: a control unit, a first power source, a second power source, and a compound switch; the first power supply is connected to the second power supply and an output terminal of the power supply device via the composite switch, and the second power supply is connected to an output terminal of the power supply device; The second power supply includes a plurality of energy storage units and at least one second power supply adjustment switch, and the connection relationship between the plurality of energy storage units is changed by adjusting the on / off of the at least one second power supply adjustment switch, thereby causing the second power supply to output voltages of different levels; the control unit determines whether a fault exists in the load based on the voltage detection signal, and if a fault exists in the load, adjusts the output voltages of the first power source and the second power source to a required voltage of the faulty load, and controls the composite switch to be turned on when an adjustment time required for the first power source is equal to or longer than an adjustment time required for the second power source, and the output voltage of the first power source is adjusted to the required voltage of the faulty load; The voltage detection signal includes required voltage information of the faulty load. A power supply device characterized by:

2. 2. The power supply device according to claim 1, wherein adjusting the output voltage of the first power supply to the required voltage of the faulty load is performed such that the difference between the output voltage of the first power supply and the required voltage of the faulty load is within a preset threshold.

3. the power supply device further includes an output switch unit; the output switch unit is connected between the composite switch and an output end of the power supply device, and an input end of the output switch unit is connected to the second power supply and the composite switch; The power supply device has N output terminals, and the output switch unit has N output terminals; 2. The power supply device according to claim 1, wherein the N output terminals of the power supply device are connected to the N output terminals of the output switch units in a one-to-one correspondence, respectively.

4. 4. The power supply device of claim 3, wherein the output switch unit includes at least N output switch subunits, each of the output switch subunits including a first end and a second end, the first ends of the N output switch subunits being respectively connected to input ends of the output switch unit, and when there are N loads, the second ends of the N output switch subunits being respectively connected to N loads in a one-to-one correspondence, and the second ends of the N output switch subunits being N output ends of the output switch unit.

5. 5. The power supply device according to claim 4, wherein the control unit is used to control the output switch subunit corresponding to the faulty load among the N output switch subunits to be turned on based on the voltage detection signal.

6. the output switch subunit includes a first output switch and a voltage adjustment resistor connected in series with the first output switch; 5. The power supply device according to claim 4, wherein the voltage adjusting resistor is for adjusting the output voltage of the power supply device.

7. the output switch subunit further includes a second output switch; the second output switch is connected in parallel to both ends of a series-connected branch circuit formed by the first output switch and the voltage adjustment resistor; 7. The power supply device according to claim 6, wherein the first output switch is an electronic switch and the second output switch is a mechanical switch.

8. the power supply device further includes a flexible power supply; 5. The power supply device according to claim 4, wherein the flexible power supply is used to finely adjust the output voltage of the power supply device.

9. 9. The power supply of claim 8, wherein the flexible power supply is connected in series with at least one of the energy storage units.

10. 9. The power supply device of claim 8, wherein the flexible power supply is connected in series between the first end of at least one of the output switch sub-units and the input end of the output switch unit.

11. the first power supply includes at least two sub-power supplies and a first power supply adjustment switch connected to the sub-power supplies; 2. The power supply device according to claim 1, wherein the control unit adjusts the first power supply adjustment switch to be turned on or off based on the voltage detection signal, thereby adjusting the output voltage of the first power supply.

12. 2. The power supply device according to claim 1, wherein the first power supply is a switching power supply.

13. the power supply device further includes a detection unit; 2. The power supply device of claim 1, wherein the detection unit is for generating a voltage detection signal, determining a required voltage of the faulty load when a load fault is detected, and transmitting a fault recovery signal when it is detected that the fault has been eliminated.

14. the compound switch includes a static switch and a bypass switch; 2. The power supply of claim 1, wherein the static switch and the bypass switch are connected in parallel.

15. 1. A power supply system, comprising: A power supply device comprising the power supply device and the output switch unit according to claim 1, The input terminal of the output switch unit is connected to the output terminal of the power supply device, and the N output terminals of the output switch unit are connected to N loads. A power supply system characterized by:

16. A power supply device control method that is applied to the power supply device according to claim 1, comprising: a short-time output stage, controlling the composite switch to an off state, adjusting the output voltage of the second power source to a voltage required by the fault load, supplying power to the fault load via the second power source, and controlling the first power source to adjust the output voltage of the first power source to the voltage required by the fault load; a stabilizing output stage in which the output voltage of the first power supply is already adjusted to the required voltage of the fault load, the composite switch is controlled to be turned on, and power is supplied to the fault load via the first power supply. A method for controlling a power supply device.

17. the power supply device further includes an output switch unit; the output switch unit is connected between the composite switch and an output end of the power supply device, and an input end of the output switch unit is connected to the second power supply and the composite switch; The method for controlling the power supply device includes: When the control unit receives a fault recovery signal, the power supply device further includes entering a reset stage; 17. The control method for a power supply device according to claim 16, wherein, in the reset step, the output switch unit and the composite switch are controlled to be kept off, the output voltage of the first power supply is adjusted to a standby voltage, and the adjustment switch of the second power supply is adjusted to a standby state.

18. The control method for the power supply device further includes a charge / discharge stage; 18. The method of claim 17, wherein in the charging / discharging step, the output switch unit is controlled to be turned off and the composite switch is controlled to be turned on, and when the first power source charges or discharges the second power source to a standby voltage, the composite switch is controlled to be turned off.

19. The power supply control method further includes a hot standby stage, 20. The method of claim 18, wherein the hot standby step controls the output switch unit and the composite switch to be kept off.

20. 20. The method of claim 19, further comprising: controlling the power supply to enter the charge / discharge phase if the output voltage of the second power supply is lower / higher than the standby voltage during the hot standby phase.

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