Multilevel 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 particularly to a power supply device and a control method.

Background Art

[0002] With the emergence of new energy, the aluminum electrolytic capacitor, an important component, is also facing a rapid increase in market needs. The quality of the aluminum electrolytic capacitor, especially the high-voltage withstand characteristics, largely depends on the quality of the oxide film of the anode aluminum foil. Controlling the growth of the oxide film on the aluminum foil surface is an extremely precise process. It is difficult to produce an anodic oxide film that meets the requirements by a single chemical conversion. Currently, the production of high-voltage anodic oxidation foils often uses a multi-stage ultra-high voltage chemical conversion technology. By gradually increasing the voltage of the chemical conversion tank in stages, the anodic oxide film is gradually grown to a level that can withstand high voltages.

[0003] However, multi-stage high-voltage chemical conversion is a serial process, and moreover, chemical conversion is a chemical process that is sensitive to time continuity. Therefore, as shown in FIG. 1, if a power supply failure occurs in one of the chemical conversion tanks, the entire chemical conversion process will stop, and the aluminum foil that has entered the chemical conversion tank at the time of failure will become waste foil and be cut, causing waste of raw materials. The loss caused by a single stop may reach 50,000 to 100,000 yuan. In addition, the chemical conversion process is one of the processes in the entire production process. The chemical conversion process stops due to a power outage in a certain chemical conversion tank, but other processes cannot stop and still idle, causing losses to the equipment and waste of energy, both of which increase the economic losses caused by the power outage. In order to avoid the occurrence of a power outage situation in the chemical conversion tank, it is essential to provide a backup power supply for the chemical conversion production line.

[0004] However, in a multi-stage chemical production line, the voltage differs between different chemical tanks, making it impossible to supply power to all loads using a common busbar. Conventional technology requires each chemical tank to have its own main power supply and a corresponding backup power supply. While this functionally meets the need for uninterruptible power supply, the number of backup power supplies is excessive, resulting in high hardware and software costs.

[0005] Furthermore, the information disclosed in the background technology described above is solely for the purpose of enhancing understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. [Overview of the Initiative] [Means for solving the problem]

[0006] This disclosure provides a power supply device and a control method that overcomes, at least to some extent, the problem in related technologies where there are too many backup power supplies needed for multi-stage chemical production lines, resulting in uneconomical hardware costs and software overhead.

[0007] Other features and benefits of this disclosure will become apparent from the detailed description below or will be partially learned through the implementation of this disclosure.

[0008] According to a first aspect of this disclosure, a power supply device for supplying power to a load is provided.

[0009] 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 terminal of the power supply device via the composite switch, and the second power supply is connected to the output terminal of the power supply device. The second power supply includes a plurality of energy storage units and at least one adjustment switch for the second power supply, and by adjusting the on / off state of the at least one adjustment switch for the second power supply, the connection relationships between the plurality of energy storage units are changed, causing the second power supply to output different levels of voltage. The control unit determines whether a fault exists in the load based on the voltage detection signal, and if a faulty load exists, it adjusts the output voltages of the first power supply and the second power supply to the required voltage of the faulty load, and if the adjustment time required for the first power supply is greater than or equal to the adjustment time required for the second power supply, and the output voltage of the first power supply is adjusted to the required voltage of the faulty load, it controls the combined switch to turn on. The voltage detection signal includes the 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 means 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 this disclosure, the power supply provided further includes an output switch unit. The output switch unit is connected between the composite switch and the output terminal of the power supply, and the input terminal of the output switch unit is connected to the second power supply and the composite switch. The power supply unit has N output terminals, and the output switch unit has N output terminals, Here, the N output terminals of the power supply unit are connected to the N output terminals of the output switch unit in a one-to-one correspondence.

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

[0013] In some embodiments of the present disclosure, the control unit controls, based on the voltage detection signal, to turn on the output switch subunit corresponding to the fault load in 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 regulating resistor connected in series with the first output switch. Here, the voltage adjustment resistor is for adjusting the output voltage of the power supply.

[0015] In some embodiments of the present disclosure, the output switch subunit further includes a second output switch, the second output switch being connected in parallel to both ends of a series-connected branch circuit comprising the first output switch and the voltage regulating 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 further includes a flexible power supply for fine-tuning the output voltage of the power supply.

[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 subunit 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 adjustment switch connected to the sub-power supplies. The control unit is configured to adjust the first power adjustment switch to be turned 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 configured to generate a voltage detection signal, determine the required voltage of the faulty load when a load fault is detected, and transmit a fault recovery signal when it is detected that the fault has been eliminated.

[0022] In some embodiments of the present disclosure, the composite 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, a power supply system is further provided, including the power supply device and the output switch unit of the first aspect. The input end of the output switch unit is connected to the output end of the power supply device, and the N output ends of the output switch unit are connected to N loads.

[0024] According to a third aspect of the present disclosure, a control method for the power supply device applied to the above power supply device is provided. The control method for the power supply device includes Control the composite switch to the off state, adjust the output voltage of the second power supply to the required voltage of the faulty load, supply power to the faulty load via the second power supply, and control the first power supply to adjust the output voltage of the first power supply to the required voltage of the faulty load, a short-time output stage; The output voltage of the first power supply has already been adjusted to the required voltage of the faulty load, control to turn on the composite switch, and supply power to the faulty load via the first power supply, a stable output stage, and includes.

[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 the output end of the power supply device, and the input end of the output switch unit is connected to the second power supply and the composite switch. Correspondingly, the control method of the provided power supply device is as follows. When the control unit receives a fault recovery signal, the power supply device further includes the step of entering a reset stage. In the reset stage, control to keep the output switch unit and the composite switch off, adjust the output voltage of the first power supply to a standby voltage, and adjust the adjustment switch of the second power supply to a standby state.

[0026] In some embodiments of the present disclosure, the control method of the provided power supply device further includes a charge / discharge stage. In the charge / discharge stage, turn off the output switch unit, control to turn on the composite switch, and when the first power supply charges or discharges the second power supply to a standby voltage, turn off the composite switch.

[0027] In some embodiments of the present disclosure, the control method of the provided power supply device further includes a hot standby stage. In the hot standby stage, control to keep the output switch unit and the composite switch off.

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

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

[0030] The power supply provided in the embodiments of this disclosure incorporates 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 state of the composite switch, thereby enabling the power supply to output the required voltage corresponding to the faulty load. This adapts to application scenarios where different loads in a multi-stage chemical production line require different voltages. This enables the use of only a single backup power supply in a multi-stage chemical production line, reducing the number of backup power supplies and improving the cost-effectiveness of hardware and software overhead.

[0031] Please understand that both the general explanation above and the detailed explanation below are illustrative and explanatory only, and do not limit this disclosure. [Brief explanation of the drawing]

[0032] The drawings herein are incorporated into the specification and constitute part of this specification, illustrating embodiments conforming to the disclosure and are used together with the specification to illustrate the principles of the disclosure. Clearly, the drawings in the following description are only a few embodiments of the disclosure, and those skilled in the art can derive other drawings from these without any creative effort.

[0033] [Figure 1] A schematic diagram of a multi-stage high-pressure chemical production line in related technologies is shown. [Figure 2] A simplified schematic diagram of the power supply device according to an embodiment of this disclosure is shown. [Figure 3] A simplified schematic diagram of a power supply device according to some embodiments of this disclosure is shown. [Figure 4] A schematic diagram of the structure of an output switch unit 301 according to some embodiments of this disclosure is shown. [Figure 5] A simplified schematic diagram of the structure of a composite switch according to some embodiments of this disclosure is shown. [Figure 6] A schematic diagram of the connection relationships of a flexible power supply in a power supply device according to some embodiments of this disclosure is shown. [Figure 7] A schematic diagram of the connection relationships of a flexible power supply in another power supply device according to some embodiments of this disclosure is shown. [Figure 8] A simplified schematic diagram of the power supply device according to a further embodiment of the present disclosure is shown. [Figure 9] A simplified schematic diagram of the power supply system according to an embodiment of this disclosure is shown. [Figure 10] A schematic flowchart of the control method applied to the power supply device shown in Figure 2 according to an embodiment of this disclosure is shown. [Figure 11] A schematic flowchart of a control method according to some embodiments of this disclosure is shown. [Figure 12] A schematic flowchart of a control method according to another embodiment of the present disclosure is shown. [Figure 13] A schematic flowchart of yet another control method according to other embodiments of the present disclosure is shown. [Figure 14] A schematic architecture diagram of a multi-stage chemical process power supply system based on a specific example of this disclosure is shown. [Figure 15] A schematic diagram of the simplified connection relationship of a power supply unit in a charged state, based on a specific example of this disclosure, is shown. [Figure 16] A schematic diagram of the structure of a simulation circuit consisting of an energy storage unit and multiple adjustment switches for a second power supply, as exemplified by this disclosure, is shown. [Figure 17]A schematic diagram of the structure of another simulation circuit consisting of a second power supply energy storage unit and multiple adjustment switches, as exemplified by this disclosure, is shown. [Figure 18] A schematic diagram of the simplified connection relationship of a power supply unit in a short-time output state, based on a specific example of this disclosure, is shown. [Figure 19] A schematic diagram of the structure of a simulation circuit consisting of multiple sub-power supplies and multiple adjustment switches for a first power supply, as described in this disclosure, is shown. [Figure 20] A schematic diagram of the simplified connection relationship of a power supply unit in a stable output state, based on a specific example of this disclosure, is shown. [Figure 21] The voltage curves shown here illustrate the recovery of power supply to two loads after a power outage, according to a specific example of this disclosure. [Figure 22] A schematic diagram of the output voltage change curve of a power supply device according to a specific example of this disclosure is shown. [Modes for carrying out the invention]

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

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

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

[0037] The inventors 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 multi-stage chemical production lines that includes at least a backup power supply and an operating power supply. Considering that the backup power supply needs to be used in a timely manner when the operating power supply fails, the backup power supply may include a temporary power supply and a long-term power supply. The temporary power supply may be, for example, a battery or a supercapacitor, and can respond quickly to a power outage failure by a static switch or converter and temporarily provide a support voltage. The long-term power supply may be, for example, a commercial power supply or a diesel generator, and can provide electrical energy by a mechanical switch, and can maintain operation for a long period of time with a slow response speed.

[0038] Based on the above findings, embodiments of the present disclosure provide a power supply device for supplying power to a load, and include a control unit 201, a first power supply 202, a second power supply 203, and a composite switch 204, as shown in Figure 2.

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

[0040] The second power supply 203 includes multiple energy storage units and at least one second power supply adjustment switch. By adjusting the on / off state of the second power supply adjustment switch, the connection relationships between the multiple energy storage units are changed, causing the second power supply 203 to output different voltage levels. Specifically, as shown in Figure 2, the second power supply 203 includes at least a first energy storage unit 231, a second energy storage unit 232, and a second power supply adjustment switch 233. By changing the on / off state of the second power supply adjustment switch 233, different connection methods for the two energy storage units can be realized, thereby achieving output capabilities for different voltage levels. Note that when there is a single power supply load, the different voltage levels output by the second power supply 203 may correspond to different voltage levels for a single load, and when there are multiple power supply loads, the different voltage levels output by the second power supply 203 may correspond to different voltage levels for each load. The control unit 201 determines whether a fault exists in the load based on the received voltage detection signal. If a faulty load exists, it adjusts the output voltages of the first power supply 202 and the second power supply 203 to the voltage required by the faulty load. Here, the adjustment time required for the first power supply 202 is greater than or equal to the adjustment time required for the second power supply 203. When the output voltage of the first power supply 202 is adjusted to the voltage required by the faulty load, the control unit 201 controls the combined switch 204 to turn on, thereby supplying electrical energy to the faulty load via the first power supply 202.

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

[0042] Furthermore, the first power supply 202 is a long-term power supply, and when actually implemented, it uses commercial power as a power source and can adjust the output voltage. When supplying power, the voltage required for fault loads such as power outages is not constant, so a certain adjustment time is required for the first power supply 202 to adjust its output voltage to the corresponding target voltage. During the adjustment period of the first power supply 202, the power supply unit uses the second power supply 203 as a temporary power supply to provide electrical energy and provide short-term voltage support for fault loads.

[0043] 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. At this time, the control unit 201 controls the composite switch 204 to turn on, thereby making the composite switch 204 conduct. In other words, when the first power supply 202 is adjusted to near the required voltage value 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 a preset threshold, the composite switch 204 is controlled to turn on, and the first power supply 202 simultaneously supplies power to the second power supply 203 and the faulty load. However, 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 supplies power only to the faulty load, that is, the first power supply 202 directly supplies power to the faulty load.

[0044] In some embodiments of this disclosure, as shown in Figure 3, the provided power supply further includes an output switch unit 301 in addition to those shown in Figure 2, the output switch unit 301 is connected between the composite switch 204 and the output terminal of the power supply, and 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 supply 203. The power supply has N output terminals, and the output switch unit 301 has N output terminals. Here, the N output terminals of the power supply are connected one-to-one with the N output terminals of the output switch unit 301. That is, the input terminal of the output switch unit 301 is connected to the second power supply 203 and the composite switch 204, respectively, and the multiple output terminals become the multiple output terminals of the power supply. The output terminal of the power supply has multiple ports, including, for example, ports 1 to p as shown in Figure 3, and is connected one-to-one with multiple loads.

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

[0046] Specifically, the output switch subunit includes a first output switch and a voltage regulating resistor connected in series with the first output switch. The voltage regulating resistor is used to adjust the output voltage of the power supply, and the first output switch is used to control whether or not the power supply outputs power. In specific implementation, one output switch unit 301 may include multiple output switch subunits, each of which includes a first output switch and a voltage regulating resistor. These are connected in series and then connected in a one-to-one correspondence to different loads, and are used to control and regulate the power supply to supply power to a faulty load.

[0047] In other embodiments of this disclosure, the output switch can be an electronic switch with a faster response speed so that the second power supply 203 can quickly supply electrical energy to a faulty load. Furthermore, if the first power supply 202 is a long-duration power supply that supplies electrical energy for a long period of time, the output switch can be a mechanical switch with lower losses so that the switch can reduce the losses of the switch. Accordingly, 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 a voltage regulating 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 regulating 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 regulating resistor. In specific implementation, as shown in Figure 4, one output switch unit 301 may include multiple output switch subunits 401, each output switch subunit 401 including a first output switch 411, a second output switch 412, and a voltage regulating resistor 413. The first output switch 411 and the voltage regulating resistor 413 are connected in series, and then the entire series-connected circuit is connected in parallel to the second output switch 412. This is further connected in a one-to-one correspondence with a load and used to control and regulate the power supply to supply power to a 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 adjustment switch connected to the sub-power supplies, and by setting the first power adjustment switch on or off, the first power supply 202 can output different voltages to satisfy a voltage range corresponding to multiple loads, or, if the distribution width between the voltages corresponding to multiple loads is too large, it can be quickly adjusted to a target voltage corresponding to one or more loads. In specific implementations, by setting the connection relationship between the first power adjustment switch and the multiple sub-power supplies, multiple output terminals are drawn out, and the voltage output by one output terminal is equal to the voltage corresponding to one load, thereby quickly outputting M different voltages using m sub-power supplies, where generally m is less than M. Furthermore, a control unit 201 is used to adjust the output voltage of the first power supply 202 by adjusting the first power adjustment switch on or off based on a received voltage detection signal. Multiple sub-power supplies and a first power adjustment switch are used to pre-set the first power supply 202 to output a voltage corresponding to the voltage required by the load, and a control unit 201 transmits a control signal to control the adjustment switch, thereby reducing the time required to adjust the output voltage of the first power supply 202 to the voltage set value. In some embodiments, the first power supply 202 is a switching power supply, that is, a continuously adjustable power supply whose output voltage can be adjusted by adjusting the switching frequency or duty cycle, for example, a resonant converter, a buck converter, or a PFC (Power Factor Correction) converter. As those skilled in the art will understand, the types of the first power supply 202 described above are merely illustrative and do not limit the scope of protection of this disclosure.

[0049] In some embodiments of this disclosure, the second power supply 203 is an adjustable power supply capable of outputting a set of specific voltage level combinations in a discontinuously adjustable manner. In addition to including the first energy storage unit 231 and the second energy storage unit 232, the second power supply 203 may also include a third energy storage unit, a fourth energy storage unit, ..., a jth energy storage unit. In other words, the second power supply 203 includes at least two energy storage units, and the energy storage units and the adjustment switch 233 of the second power supply form an energy storage network. By controlling the on or off of the adjustment switch 233 of the second power supply, multiple energy storage units can be connected in parallel, series, or series-parallel configurations, thereby allowing the second power supply 203 to output different voltages. In specific implementations, the different voltage levels of multiple loads can be statistically analyzed in advance, and the greatest common divisor of the different voltage levels of multiple loads can be determined, thereby determining the output voltage value of each energy storage unit. Furthermore, the connection relationships of the adjustment switches are designed, and the number of adjustment switches 233 of the second power supply and their connection relationships with the energy storage units are determined. This allows multiple energy storage units to be arranged and combined using the adjustment switches 233 of the second power supply, thereby obtaining output voltages that are different multiples of the output voltage value of a single energy storage unit.

[0050] In some embodiments of this disclosure, the composite switch 204 includes a static switch and a bypass switch, which are connected in parallel. In a specific embodiment, as shown in Figure 5, a simplified schematic diagram of the composite switch 204 is shown, which includes a bypass switch and a static switch connected in parallel, and generally the bypass switch is a mechanical switch and the static switch is an electronic switch. When the composite 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 composite 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 voltage or current surges.

[0051] In specific implementation, due to factors such as losses, the multiple output voltages obtained by connecting multiple energy storage units via the adjustment switch 233 of the second power supply 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 of the different voltage levels of the multiple loads may be too small, resulting in a large number of required energy storage units, a complex circuit structure, and increased hardware costs. In specific implementation, the output voltage value of each energy storage unit can 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 about 80V, the output voltage value of each energy storage unit can be set to 80V. Alternatively, energy storage units of general capacity can be used, for example, by selecting an energy storage unit with an output voltage of 50V. However, in such an installation, the multiple output voltages obtained via the connection switch network of multiple energy storage units may have a certain error with the different voltage levels of the multiple loads. To reduce the above error, in some embodiments of this disclosure, the power supply further includes a flexible power supply, which fine-tunes the output voltage of the power supply to correct the above error. In some embodiments of this 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 within a 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, thereby enabling the power supply to provide a precise voltage to a faulty load. In specific implementations, 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, thereby enabling the second power supply 203 to provide a more flexible output voltage.In other embodiments of the present disclosure, as shown in Figure 7, a flexible power supply is connected in series between the first terminal of at least one output switch subunit and the input terminal of the output switch unit 301, thereby adjusting the voltage output from the output terminals of one or more power supplies connected in series with the flexible power supply. For example, the voltage required for the load 2 shown in Figure 7 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 subunit connected to the load 2 and the output terminal 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 terminal of port 2 of the power supply can output a voltage of 880V to the load 2.

[0052] In specific implementation, the above errors can be analyzed, the range of error distribution corresponding to each output can be determined, and based on this range, the distribution range of the output voltage of the flexible power supply can be determined 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 in order to simplify the control process and reduce the power supply response time of the power supply device. This 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, and as a result, the power outage time of the faulty load is reduced and losses are reduced.

[0053] In some embodiments of this disclosure, as shown in Figure 8, a detection unit 801 is further included in addition to Figure 3, which is used to generate a voltage detection signal, determine the required voltage of the faulty load when a load fault is detected, and transmit a fault recovery signal to the control unit when it is detected that the fault has been resolved. Specifically, the detection unit 801 is used to detect the state of multiple loads, determine the required voltage of the faulty load when a load failure is detected, and generate a voltage detection signal based on the required voltage of the faulty load. When it is detected that the load fault has been resolved, i.e., after the existing power supply has restored power to the load, it generates a fault recovery signal and transmits it to the control unit. The power supply is connected to each of the multiple loads via an output switch unit 301, which, after receiving the voltage detection signal, is used to connect the power supply to the faulty load and transmit electrical energy. After receiving the fault recovery signal, the connection between the power supply and the faulty load is disconnected. In specific implementation, the control unit 201 further controls the on / off state of the first output switch and / or second output switch by a voltage detection signal or a fault recovery signal, thereby used to connect or disconnect the power supply to a faulty load. As those skilled in the art will understand, the detection unit 801 may be installed independently or integrated into the control unit 201, and is not limited herein.

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

[0055] Short-time output state: When the second power supply 203 is outputting, the connection between the first power supply 202 and the second power supply 203 is disconnected, and the adjustment switch 233 of the second power supply 203 is adjusted to output a target voltage corresponding to the current faulty load's required voltage, and the output voltage is further adjusted precisely by the voltage adjustment resistor. In addition, the output switch unit 301 corresponding to the faulty load is turned on, thereby allowing the second power supply 203 to supply power to the faulty load.

[0056] During a short-term output state, the second power supply 203 adjusts its internal connection structure based on the voltage detection signal, and after reaching the voltage required by the faulty load, turns on the switch in the output switch unit 301 corresponding to the faulty load, supplying power to the faulty load. Simultaneously, 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, the combined switch 204 is turned on when the output voltage of the first power supply 202 is adjusted to the required voltage of the faulty load, and the first power supply 202 directly supplies stable power to the faulty load for a long period of time via the combined switch 204 and the output switch unit 301.

[0058] After the voltage adjustment of the first power supply 202 is complete, the static switch of the composite switch 204 is turned on to quickly supply power to the load. Then, the bypass switch of the composite switch 204 is turned on, and after the bypass switch is fully on, the static switch is turned off to ensure a stable power supply to the load.

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

[0060] Charging / Discharging State: In this state, based on the relationship between the standby voltage and the required voltage of the faulty load, the first power supply 202 uses the standby voltage to charge or discharge the second power supply 203. Specifically, if the standby voltage of the first power supply 202 is greater than the required voltage of the faulty load, it enters the charging state, the output switch unit 301 turns off, the bypass switch of the composite switch 204 turns on, and the first power supply 202 charges the second power supply 203, which is in a standby connection configuration, using the standby voltage. If the standby voltage of the first power supply 202 is less than the required voltage of the faulty load, it enters the discharging state, the output switch unit 301 turns off, the composite switch 204 turns on, and the first power supply 202 discharges the second power supply 203 to the standby voltage.

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

[0062] Hot Standby State: After the second power supply 203 has finished charging, the system enters a hot standby state, and the composite switch 204 and output switch unit 301 are all disconnected. In the hot standby state, the voltage of the second power supply 203 is monitored, and if the voltage falls below a preset threshold, the composite switch 204 is turned on, and the system returns to the charging state. In a specific embodiment, the power supply can remain in the hot standby state for an extended period, thereby ensuring that in the event of a load failure, the power supply can quickly come into operation and supply power to the faulty load.

[0063] As can be seen from the above, the power supply device according to the embodiment of this disclosure, by installing a first power supply 202, a second power supply 203, a control unit 201, and a composite switch 204, adjusts the output voltages of the first power supply 202 and the second power supply 203 using the control unit 201, and controls the on / off state of the composite switch 204, thereby enabling the power supply device to output voltages at different voltage levels corresponding to multiple loads, and thus adapting to application scenarios in multi-stage chemical production lines where different loads require different voltages. This enables the use of only a single backup power supply device in a multi-stage chemical production line, reduces the number of backup power supplies, lowers hardware and software costs, and makes the multi-stage chemical production line more economical.

[0064] Embodiments of this disclosure further provide a power supply system based on the same inventive concept. As shown in Figure 9, the system includes a power supply unit 901 and an output switch unit 902. Specifically, the structure of the power supply unit 901 is as shown in Figure 2, 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 unit 901, and the N output terminals of the output switch unit 902 are connected to N loads. In specific implementations, the output switch unit 902 is electrically connected to a control unit 201, which is used to connect a faulty load to the power supply unit 901 by controlling the output terminal of the N output terminals of the output switch unit 902 that is connected to the faulty load, based on a received voltage detection signal. The internal structure and control logic of the output switch unit 902 can be referenced from the output switch unit 301, which embodiments of this disclosure are not described here.

[0065] As can be seen from the above, the power supply system according to the embodiment of this disclosure is configured such that a first power supply 202, a second power supply 203, a control unit 201, and a composite switch 204 are installed in the power supply unit 901. 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 state of the composite switch 204. As a result, the power supply unit can output voltages at different voltage levels corresponding to multiple loads. An output switch unit 902 is installed, each connected to N loads. Based on the received voltage detection signal, the control unit 201 controls the output switch unit 902 to connect the power supply unit 901 to the faulty load. This allows the power supply unit 901 to supply power to the faulty load, thus adapting to application scenarios where different loads in a multi-stage chemical production line require different voltages. This enables the use of only a single backup power supply in a multi-stage chemical production line, reducing the number of backup power supplies, further reducing hardware and software costs, and making the multi-stage chemical production line more economical.

[0066] The embodiments of this disclosure, based on the same inventive concept, further provide control methods applicable to power supply devices, as described in the following embodiments. Since the principle by which the embodiments of the control method solve the problem is similar to that of the above-described embodiments of the power supply device, the implementation of the embodiments of the control method can be referenced from the implementation of the above-described embodiments of the power supply device, and the explanation of any overlapping parts will be omitted.

[0067] Figure 10 shows a control method applied to the power supply device shown in Figure 2 in an embodiment of the present disclosure, and includes the following steps.

[0068] S1002, During the short-time output phase, the composite switch 204 is controlled to the off state, the output voltage of the second power supply 203 is adjusted to the voltage required by the faulty load, power is supplied to the faulty load via 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 voltage required by the faulty load.

[0069] At this time, the power supply unit is in the short-term output state described above.

[0070] S1004, during the stable output phase, the output voltage of the first power supply 202 has already been adjusted to the required voltage of the faulty load, and is controlled to turn on the composite switch 204, supplying power to the faulty load via the first power supply 202.

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

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

[0073] S1102, when the control unit 201 receives a fault recovery signal, the power supply enters the reset phase. During the reset phase, the output switch unit 301 and the composite switch 204 are controlled to remain in the OFF position, the output voltage of the first power supply 202 is adjusted to the standby voltage, and the adjustment switch 233 of the second power supply is adjusted to the standby state.

[0074] At this time, the power supply unit is in the reset state described above. When actually implementing this, the standby voltage is generally set to a set value, which may be set based on a value that frequently appears in the voltage history data provided by the power supply unit, or it may be determined based on the voltages corresponding to multiple loads, for example, it may be set to the median value of the voltages corresponding to multiple loads. This allows the output voltage of the first power supply 202 to 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 this disclosure, the control method shown in Figure 12 further includes the following steps in addition to those shown in Figure 10.

[0076] S1202, during the charge / discharge phase, the output switch unit 301 is controlled to turn off and the composite switch 204 is controlled to turn on. When the first power supply 202 has charged or discharged the second power supply 203 to standby voltage, the composite switch 204 is turned off.

[0077] At this time, the power supply unit is in the above-mentioned 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 phase is initiated, the output switch unit 301 is turned off, and the composite switch 204 is turned on. When the first power supply 202 charges the second power supply 203 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 discharge phase is initiated, the output switch unit 301 is turned off, and the composite switch 204 is turned on. When the first power supply 202 discharges the second power supply 203 to the standby voltage, the composite switch 204 is turned off.

[0078] In some embodiments of this disclosure, the control method shown in Figure 13 further includes the following steps in addition to those shown in Figure 12.

[0079] S1302, during the hot standby phase, control is performed to keep the output switch unit 301 and the composite switch 204 in the OFF position.

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

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

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

[0083] To better illustrate the power supply device and control method applied to the power supply device according to the embodiments of this disclosure, a specific example will be provided. The power supply device according to this specific example is used as a backup power supply in a multi-stage chemical process power supply system, as shown in Figure 14.

[0084] The detection unit detects multiple series loads and determines the state of multiple series loads (only three loads are shown in Figure 14). The output switch unit is connected to the power supply and each of the multiple series loads, 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 uses the commercial power input as its energy source.

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

[0086] [Table 1]

[0087] In a concrete implementation, as shown in Figure 15, this is a schematic diagram of the simplified connection relationship in a power supply unit in a hot standby state, where the first power supply charges the second power supply using a standby voltage of 900V. During charging, the connection switch connects the six energy storage units (capacitors C1 to C6) in the second power supply in series, and the first power supply charges each energy storage unit in the second power supply to 150V (△V = 150V, which is determined according to the difference between the voltage levels corresponding to multiple loads). As shown in Figure 16, this specific example is a structural diagram of a simulation circuit consisting of the energy storage units of the second power supply and adjustment switches for multiple second power supplies. By designing the adjustment switch connection network shown in Figure 16, it is possible to output six different voltage levels of 150V, 300V, 450V, 600V, 750V, and 900V from the second power supply using the switch connection network and methods such as series, parallel, and series-parallel connections of capacitors. As shown in Table 2, when the adjustment switches (S11 to S110) for each second power supply in Figure 16 are turned off or on, the corresponding changes in the output voltage value of the second power supply are shown. In Table 2, "1" indicates that the adjustment switch for the second power supply is on, and "0" indicates that the adjustment switch for 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 consisting 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, this is a schematic diagram of the simplified connection relationship of the power supply unit in a short-time output state. The detection unit determines the location of the faulty load and that 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, connects the six energy storage units in groups of three in series, and then in parallel to output a voltage of 450V, and further controls the output switch unit to turn on, thereby supplying power to the faulty load from the second power supply. Furthermore, it transmits a control signal to the first power supply to control the output voltage of the first power supply.

[0091] The structural diagram of the simulation circuit, which consists of multiple sub-power supplies and multiple adjustment switches in the first power supply, is shown in Figure 19. By designing the connection network as shown in Figure 19, four output terminals capable of outputting 15 different voltages can be obtained by combining four sub-power supplies in series, parallel, or series-parallel configurations. The backend can power up to 15 loads with different voltage levels via an additional output distribution switch. As shown in Table 3, the corresponding changes in the output voltage value of the first power supply are shown when each of the first power supply adjustment switches (S21~S214) of the first power supply shown in Figure 19 is off or on. In Table 3, "1" indicates that the first power supply adjustment switch is on, "0" indicates that the first power supply adjustment 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 specific example, after the control unit controls the first power adjustment switch of the first power supply to turn on or off, if the output voltage of the first power supply is 450V, it enters a stable output state.

[0094] As shown in Figure 20, this is a schematic diagram of the simplified connection relationship of the power supply unit in a stable output state. The control unit controls the composite switch to turn on, and the first power supply directly supplies power to the faulty load. Furthermore, in order to reduce switch losses, 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 faulty load for a long period of time, losses and temperature rise must be taken into consideration, and an output mechanical switch with lower losses and temperature rise is used.

[0095] After the fault is resolved, the backup power supply is deactivated and the power supply is reset. Due to the high frequency of 900V occurrences at voltage levels corresponding to the load in this system, the standby voltage of the first power supply is set to 900V, thereby reducing the voltage adjustment time of the first power supply.

[0096] As shown in Figure 21, when the power supply device according to the embodiment of this disclosure is used as a backup power supply, the voltage curve in this specific example shows the restoration of power supply after a power outage at two loads. As can be seen from the figure, a fault occurs at a timing of 0.4s, disconnecting the connection between the main power supply and the faulty load, and simultaneously arranging the second power supply in the corresponding topology and outputting to the load. After 3ms, once the voltage adjustment of the first power supply is complete, it is connected to the load and the second power supply is disconnected. Within the short power supply range of 3ms, the output voltage deviation of the second power supply is <10V, and the maximum error with respect to the rated voltage is <2%, indicating that the error is small and within an acceptable range in the process. Furthermore, the power outage time is very short, significantly reducing losses.

[0097] As shown in Figure 22, a schematic diagram of the output voltage change curve in this specific embodiment is available. As can be seen, in this specific example, the combined action of the first and second power supplies allows the output voltage of the entire power supply unit to quickly reach the desired level, significantly reducing the time of load failure or significant voltage drop, and ensuring the continuity of power supply and the quality of the chemical process. Compared to solutions that independently place redundant power supplies for each load, this method saves more cost and volume, reduces the complexity of the power supply system, and improves reliability. For power supply systems that require multiple power supplies to be connected in series, such as chemical production lines, installing this power supply unit as a backup power supply can effectively and significantly improve the reliability of the entire power supply system, thereby appropriately reducing the stringent reliability requirements of a single power supply in the power supply system and further lowering industrial costs.

[0098] Those skilled in the art will understand that various aspects of this disclosure can be embodied as systems, methods, or program products. Accordingly, various aspects of this disclosure can be embodied as entirely hardware embodiments, entirely software embodiments (including firmware, microcode, etc.), or embodiments combining hardware and software, and may be referred to herein as “circuits,” “modules,” or “systems.” Note that while the above detailed description refers to several modules or units of equipment for performing operations, such distinctions are not mandatory. In fact, according to embodiments of this disclosure, the features and functions of two or more modules or units described above can be embodied in a single module or unit. Conversely, the features and functions of one module or unit described above can be further divided so as to be embodied by multiple modules or units.

[0099] Furthermore, although the various steps of the method in this disclosure are shown in the drawings in a specific order, this does not require or imply that the steps must be performed in a specific order, or that all shown steps must be performed, in order to achieve the desired result. Additionally or alternatively, some steps may be omitted, several steps may be combined into one step, and / or one step may be divided into several steps.

[0100] As will be readily apparent to those skilled in the art from the above description of embodiments, the exemplary embodiments described herein may be implemented by software or by combining software with necessary hardware. Accordingly, the technical solutions according to the embodiments of this disclosure can be embodied in the form of a software product, which can be stored on a single non-volatile storage medium (which may be a CD-ROM, USB memory, removable hard disk, etc.) or on a network, and which can include a plurality of instructions to cause a single computing device (which may be a personal computer, server, mobile terminal, or network device, etc.) to execute the method according to the embodiments of this disclosure.

[0101] Those skilled in the art will readily come up with other embodiments of the Disclosure after reviewing and practicing the Specification and the Inventions Disclosed herein. In accordance with the general principles of the Disclosure, this Disclosure is intended to encompass any variations, uses, or adaptive changes of the Disclosure, including well-known knowledge or conventional technical means in the Art not disclosed herein. The Specification and Examples are illustrative only, and the true scope and spirit of the Disclosure are indicated by the appended Claims.

Claims

1. A power supply device for supplying power to a load, 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 terminal of the power supply device via the composite switch, and the second power supply is connected to the output terminal of the power supply device. The second power supply includes a plurality of energy storage units and at least one adjustment switch for the second power supply, and by adjusting the on / off state of the adjustment switch for the at least one second power supply, the connection relationships between the plurality of energy storage units are changed, causing the second power supply to output different levels of voltage. The control unit determines whether a fault exists in the load based on the voltage detection signal, and if a faulty load exists, it adjusts the output voltages of the first power supply and the second power supply to the voltage required by the faulty load, and if the adjustment time required for the first power supply is greater than or equal to the adjustment time required for the second power supply, and the output voltage of the first power supply is adjusted to the voltage required by the faulty load, it controls the combined switch to turn on. The voltage detection signal includes the requested voltage information of the faulty load. A power supply device characterized by the following features.

2. The power supply device according to claim 1, characterized in that adjusting the output voltage of the first power supply to the required voltage of the faulty load means 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 unit further includes an output switch unit, The output switch unit is connected between the composite switch and the output terminal of the power supply, and the input terminal of the output switch unit is connected to the second power supply and the composite switch. The power supply unit has N output terminals, and the output switch unit has N output terminals, The power supply device according to claim 1, characterized in that 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.

4. The power supply device according to claim 3, wherein 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 the input terminal of the output switch unit, and when there are N loads, the second ends of the N output switch subunits are connected to each of the N loads in a one-to-one correspondence, and the second ends of the N output switch subunits are the N output terminals of the output switch unit.

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

6. The output switch subunit includes a first output switch and a voltage regulating resistor connected in series with the first output switch. The power supply device according to claim 4, characterized in that the voltage adjustment 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 the series-connected branch circuit consisting of the first output switch and the voltage adjustment resistor. The power supply device according to claim 6, characterized in that 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, The power supply device according to claim 4, characterized in that the flexible power supply is for fine-tuning the output voltage of the power supply device.

9. The power supply device according to claim 8, characterized in that the flexible power supply is connected in series to at least one of the energy storage units.

10. The power supply device according to claim 8, characterized in that the flexible power supply is connected in series between the first end of at least one of the output switch subunits 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 adjustment switch connected to the sub-power supplies. The power supply device according to claim 1, characterized in that 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.

12. The power supply device according to claim 1, characterized in that the first power supply is a switching power supply.

13. The power supply further includes a detection unit, The power supply device according to claim 1, characterized in that the detection unit generates a voltage detection signal, determines the required voltage of the faulty load when a load fault is detected, and transmits a fault recovery signal when it is detected that the fault has been resolved.

14. The composite switch includes a static switch and a bypass switch, The power supply device according to claim 1, characterized in that the static switch and the bypass switch are connected in parallel.

15. A power supply system, Includes the power supply device and output switch unit described in claim 1, The input terminal of the output switch unit is connected to the output terminal of the power supply, and the N output terminals of the output switch unit are connected to N loads. A power supply system characterized by the following features.

16. A control method for a power supply device applied to the power supply device described in claim 1, A short-time output stage is provided in which the composite switch is controlled to the OFF state, the output voltage of the second power supply is adjusted to the voltage required by the faulty load, power is supplied to the faulty load 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 faulty load. The system includes a stable output stage in which the output voltage of the first power supply is already adjusted to the required voltage of the faulty load, the composite switch is controlled to turn on, and power is supplied to the faulty load via the first power supply. A method for controlling a power supply device, characterized by the following features.

17. The power supply unit further includes an output switch unit, The output switch unit is connected between the composite switch and the output terminal of the power supply, and the input terminal of the output switch unit is connected to the second power supply and the composite switch. The control method for the power supply device is as follows: If the control unit receives a fault recovery signal, the power supply device further includes the step of entering a reset phase. The power supply control method according to claim 16, characterized in that during the reset stage, the output switch unit and the composite switch are controlled to be kept in the OFF state, the output voltage of the first power supply is adjusted to the standby voltage, and the adjustment switch of the second power supply is adjusted to the standby state.

18. The control method for the power supply device further includes a charging / discharging step, The power supply control method according to claim 17, characterized in that during the charging / discharging stage, the output switch unit is turned off and the composite switch is turned on, and when the first power supply charges or discharges the second power supply to the standby voltage, the composite switch is turned off.

19. The control method for the power supply device further includes a hot standby stage, The power supply control method according to claim 18, characterized in that, during the hot standby phase, the output switch unit and the composite switch are controlled to remain in the OFF position.

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

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