WO2024065075A1

WO2024065075A1 - Power supply apparatus, method and system

Info

Publication number: WO2024065075A1
Application number: PCT/CN2022/121204
Authority: WO
Inventors: 宫新光
Original assignee: 航霈科技(深圳)有限公司
Priority date: 2022-09-26
Filing date: 2022-09-26
Publication date: 2024-04-04
Also published as: CN115843407A

Abstract

Provided in the embodiments of the present application are a power supply apparatus, method and system. The power supply apparatus comprises a first energy storage unit, a rectifier, an inverter and a switching unit, wherein one end of the rectifier is connected to a first input power source; the other end of the rectifier is connected to one end of the inverter, an output end of the first energy storage unit and a first input end of a load; the other end of the inverter is connected to an output end of the switching unit and a second input end of the load; a first input end and a second input end of the switching unit are respectively connected to the first input power source and a second input power source; the first input power source, the second input power source and the first energy storage unit jointly supply power to the load; and if a voltage outputted by the first input power source is less than a preset first threshold value, and a voltage outputted by the second input power source is less than a preset second threshold value, the first energy storage unit is used for supplying power to the first input end of the load, and power is supplied to the second input end of the load by means of the inverter. The power supply apparatus has relatively high reliability in terms of supplying power to a load.

Description

Power supply device, method and system

Technical Field

The present application relates to the field of power supply technology, and more specifically, to a power supply device, method and system.

Background technique

The power supply device is a power supply device connected between the load of key equipment and the power supply. It is used to provide continuous power to the load through the power supply when the power supply is working normally, and to supply power to the load through the energy storage unit when the power supply is interrupted or insufficient.

At present, the key equipment loads in the data center field support dual power input power supply. The power supply device uses one high-voltage DC and one AC power supply to supply power to the DC side and AC side of the dual power load.

However, when the mains connected to the DC side of the dual-power load fails, the energy storage unit can provide uninterrupted power supply, while the AC side can only be powered by the mains. Therefore, the power supply device needs to rely on the reliability of the mains when supplying power to the dual-power load. However, the reliability of the mains depends on the reliability of the power grid. The power grid cannot guarantee the reliability of long-term power supply, which makes the reliability of the AC side input of the dual-power load low, thereby reducing the reliability of the power supply device in supplying power to the dual-power load.

Summary of the invention

In view of this, embodiments of the present application provide a power supply device, method and system to at least partially solve the above problems.

According to a first aspect of an embodiment of the present application, a power supply device is provided, comprising: a first energy storage unit, a rectifier, an inverter and a switching unit; one end of the rectifier is connected to a first input power supply, the other end of the rectifier is respectively connected to one end of the inverter, the output end of the first energy storage unit and the first input end of the load, the other end of the inverter is respectively connected to the output end of the switching unit and the second input end of the load, the first input end and the second input end of the switching unit are respectively connected to the first input power supply and the second input power supply, the first input power supply, the second input power supply and the first energy storage unit jointly supply power to the load; if the voltage output by the first input power supply is less than a preset first threshold value, and the voltage output by the second input power supply is less than a preset second threshold value, the first energy storage unit is used to supply power to the first input end of the load, and the first energy storage unit is used to supply power to the second input end of the load through the inverter.

According to a second aspect of an embodiment of the present application, a power supply method is provided, which is applied to a power supply device, wherein the power supply device comprises: a first energy storage unit, a rectifier, an inverter and a switching unit, wherein one end of the rectifier is connected to a first input power supply, and the other end of the rectifier is respectively connected to one end of the inverter, the first energy storage unit and the first input end of the load, and the other end of the inverter is respectively connected to the output end of the switching unit and the second input end of the load, and the first input end and the second input end of the switching unit are respectively connected to the first input power supply and the second input power supply, and the first input power supply, the second input power supply and the first energy storage unit jointly supply power to the load, and the power supply method comprises: if the voltage output by the first input power supply is less than a first threshold value, and the voltage output by the second input power supply is less than a second threshold value, then controlling the first energy storage unit to supply power to the first input end of the load, and controlling the first energy storage unit to supply power to the second input end of the load through the inverter.

According to a third aspect of an embodiment of the present application, a power supply system is provided, comprising: at least one power supply device as described in the first aspect of the embodiment of the present application, and a second input power supply and at least one first input power supply; each of the first input power supplies comprises a power distribution cabinet and a mains input unit connected to an input end of the power distribution cabinet, the output end of the power distribution cabinet is connected to one end of a rectifier in the power supply device and a first input end of a switching unit, wherein the first input power supply and the power supply device correspond one to one; the second input power supply comprises a power distribution cabinet, a mains input unit connected to an input end of the power distribution cabinet and a generator, an uninterruptible power supply device and a second energy storage unit, the output end of the power distribution cabinet is connected to the first input end of the uninterruptible power supply device, the output end of the second energy storage unit is connected to the second input end of the uninterruptible power supply device, and the output end of the uninterruptible power supply device is respectively connected to the second input end of the switching unit in each of the power supply devices; if the voltage output by the first input power supply in each of the power supply devices is less than a first threshold value, and the voltage output by the second input power supply is less than a second threshold value, the first energy storage unit is controlled to supply power to the first input end of the load, and the first energy storage unit is controlled to supply power to the second input end of the load through the inverter.

In an embodiment of the present application, the first input power source supplies power to the first input terminal of the load through a rectifier in the power supply device, the first input power source and the second input power source are connected to the load through a switching unit in the power supply device, and supply power to the second input terminal of the load, and an inverter is provided in the power supply device. When the voltage output by the first input power source is less than a preset first threshold value, and the voltage output by the second input power source is less than a preset second threshold value, that is, when both the first input power source and the second input power source fail, the first input terminal and the second input terminal of the load can be supplied with power simultaneously through the first energy storage unit. Therefore, in the embodiment of the present application, in the event of a mains input failure, the load can also be supplied with power through the first energy storage unit. The power supply device does not rely on the reliability of the mains, thereby improving the stability of the power supply device supplying power to the load, so the power supply device has high reliability.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

FIG1 is a schematic diagram of a power supply device provided in an embodiment of the present application;

FIG2 is a schematic diagram of power supply by a power supply device provided in an embodiment of the present application;

FIG3 is a schematic diagram of another power supply device provided in an embodiment of the present application;

FIG4 is a schematic diagram of power supply by another power supply device provided in an embodiment of the present application;

FIG5 is a schematic diagram of power supply of another power supply device provided in an embodiment of the present application;

FIG6 is a schematic diagram of power supply by another power supply device provided in an embodiment of the present application;

FIG7 is a schematic diagram of another power supply device provided in an embodiment of the present application;

FIG8 is a schematic diagram of a power supply system provided in an embodiment of the present application;

FIG. 9 is a schematic diagram of another power supply system provided in an embodiment of the present application.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the embodiments of the present application should fall within the scope of protection of the embodiments of the present application.

The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and/or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

FIG1 is a schematic diagram of a power supply device 100 provided in an embodiment of the present application, and FIG2 is a schematic diagram of a power supply device 100 provided in an embodiment of the present application. As shown in FIG1 , the power supply device 100 includes: a first energy storage unit 101, a rectifier 102, an inverter 103, and a switching unit 104. One end of the rectifier 102 is connected to a first input power source 105, and the other end of the rectifier 102 is respectively connected to one end of the inverter 103, the output end of the first energy storage unit 101, and the first input end of the load 107, and the other end of the inverter 103 is respectively connected to the output end of the switching unit 104 and the second input end of the load 107, and the first input end and the second input end of the switching unit 104 are respectively connected to the first input power source 105 and the second input power source 106, and the first input power source 105, the second input power source 106, and the first energy storage unit 101 jointly supply power to the load 107.

When this power supply device 100 is applied, as shown in Figure 2, if the voltage output by the first input power supply 105 is less than a preset first threshold, and the voltage output by the second input power supply 106 is less than a preset second threshold, the first energy storage unit 101 supplies power to the first input terminal of the load 107, and the first energy storage unit 101 supplies power to the second input terminal of the load 107 through the inverter 103.

In one implementation of the present application, the first energy storage unit 101 may be controlled by a controller (not shown in the figure) to supply power to the load, that is, if the voltage output by the first input power source 105 is less than a preset first threshold value, and the voltage output by the second input power source 106 is less than a preset second threshold value, the controller controls the first energy storage unit 101 to supply power to the first input terminal of the load 107, and the controller controls the first energy storage unit 101 to supply power to the second input terminal of the load 107 through the inverter 103. The controller may be used to determine whether the voltage output by the first input power source 105 is less than the first threshold value, determine whether the voltage output by the second input power source 106 is less than the second threshold value, and control the first energy storage unit 101 to supply power to the first input terminal of the load 107, and control the first energy storage unit 101 to convert the output direct current into alternating current through the inverter 103 when the input voltages of the first input power source 105 and the second input power source 106 do not meet the requirements of the load 107, so as to supply power to the second input terminal of the load 107 through uninterrupted power supply to the load 107.

Specifically, as shown in Figure 9, the controller can be the controller 206 in the following embodiment, which can determine whether the voltage output by the first input power supply 105 is less than the first threshold by controlling the rectifier 102, and determine whether the voltage output by the second input power supply 106 is less than the second threshold by controlling the inverter 103, thereby controlling the converter 1012 in Figure 9 to enable the first energy storage unit 101 to supply power to the first input terminal of the load 107, and controlling the converter 1012 and the inverter 103 to enable the first energy storage unit 101 to supply power to the second input terminal of the load 107.

A first threshold and a second threshold corresponding to the power supply output voltage are preset. The first threshold is used to limit the minimum output voltage of the first input power supply 105 to the rectifier 102, and the second threshold is used to limit the minimum output voltage of the second input power supply 106 to the load 107. The first threshold corresponds to the voltage required by the first input terminal of the load 107, and the second threshold corresponds to the voltage required by the second input terminal of the load 107.

It should be understood that when the voltage output by the first input power supply 105 is less than the first threshold value, the first input power supply 105 fails. At this time, the voltage output by the first input power supply 105 cannot meet the input voltage of the rectifier 102, which means that the output of the rectifier 102 cannot meet the voltage required by the first input terminal of the load 107, and the first energy storage unit 101 is controlled to supply power to the first input terminal of the load 107. When the voltage output by the second input power supply 106 is less than the second threshold value, the second input power supply 106 fails. At this time, the voltage output by the second input power supply 106 cannot meet the voltage required by the second input terminal of the load 107, and the first energy storage unit 101 is controlled to supply power to the second input terminal of the load 107 through the inverter 103. At this time, the switching unit 104 is in an open circuit state, which can prevent the first energy storage unit 101 from feeding power to the grid.

It should also be understood that the accompanying drawings only show one fault condition of the first input power supply 105 and the second input power supply 106, that is, the output voltage of the first input power supply 105 and the second input power supply 106 are both 0. Optionally, when another fault occurs to the first input power supply 105 and the second input power supply 106, that is, the output voltage of the first input power supply 105 and the second input power supply 106 is not 0, but does not meet the power supply demand of the load 107, the first input power supply 105 and the second input power supply 106 can jointly supply power to the load 107 with the first energy storage unit 101, which will not be repeated here.

It should also be understood that both the first input power supply 105 and the second input power supply 106 are AC input power supplies, that is, when the first input power supply 105 and the second input power supply 106 fail, it can be understood as a AC input failure.

In the embodiment of the present application, the first input power supply 105 supplies power to the first input terminal of the load 107 through the rectifier 102 in the power supply device 100, and the first input power supply 105 and the second input power supply 106 are connected to the load 107 through the switching unit 104 in the power supply device 100, and supply power to the second input terminal of the load 107. In addition, the power supply device 100 is provided with an inverter 103. When the voltage output by the first input power supply 105 is less than the preset first threshold value, and the voltage output by the second input power supply 106 is less than the preset second threshold value, that is, when both the first input power supply 105 and the second input power supply 106 fail, the first energy storage unit 101 can supply power to the first input terminal and the second input terminal of the load 107 at the same time. Therefore, in the case of a mains input failure, the load 107 can also be supplied with power by the power supply device 100, so that the power supply device 100 does not rely on the reliability of the mains, thereby improving the stability of the power supply device 100 supplying power to the load 107, so that the power supply device 100 has a higher reliability.

Figure 3 is a schematic diagram of power supply of another power supply device 100 provided in an embodiment of the present application. As shown in Figure 3, if the voltage output by the first input power supply 105 is less than the first threshold value, and the voltage output by the second input power supply 106 is greater than or equal to the second threshold value, the first energy storage unit 101 supplies power to the first input terminal of the load 107, and the second input power supply 106 supplies power to the second input terminal of the load 107.

When only the first input power supply 105 fails, that is, the voltage output by the first input power supply 105 cannot meet the input voltage requirement of the rectifier 102, and thus cannot meet the voltage required by the first input terminal of the load 107, the first energy storage unit 101 is controlled to supply power only to the first input terminal of the load 107. Since the voltage output by the second input power supply 106 is greater than or equal to the second threshold at this time, the voltage output by the second input power supply 106 meets the voltage required by the second input terminal of the load 107, and the second input power supply 106 is controlled to supply power to the second input terminal of the load 107.

In an embodiment of the present application, when a failure occurs in the first input power supply 105, the first energy storage unit 101 is controlled to supply power to the first input terminal of the load 107, and the second input power supply 106 is controlled to supply power to the second input terminal of the load 107, thereby ensuring uninterrupted power supply to the load 107 and improving the reliability of the power supply device 100.

In a possible implementation, the first input terminal of the load 107 is a DC input terminal, and the second input terminal of the load 107 is an AC input terminal.

The first end of the load 107 is a DC input end, and the second end of the load 107 is an AC input end. Therefore, the DC power output by the energy storage battery 1011 in the first energy storage unit 101 can directly power the first input end of the load 107, and the DC power output by the energy storage battery 1011 can be converted into AC power by the inverter 103 to power the second input end of the load 107.

In the embodiment of the present application, the load 107 is a dual-power load 107, which has both direct current and alternating current power supply, thereby ensuring uninterrupted power supply to the load 107, thereby ensuring that the load 107 can operate stably.

In one possible implementation, the inverter 103 is a bidirectional inverter 103, which can convert the first direct current output by the first energy storage unit 101 into a first alternating current, and transmit the first alternating current to the second input terminal of the load 107, or convert the second alternating current output by the second input power supply 106 into a second direct current, and transmit the second direct current to the first input terminal of the load 107.

It should be understood that the bidirectional inverter 103 can play an inversion role, that is, convert direct current into alternating current, if used in the forward direction, and can play a rectification role, that is, convert alternating current into direct current, if used in the reverse direction.

In the embodiment of the present application, the inverter 103 is a bidirectional inverter 103, which can convert DC power into AC power when necessary, and can also convert AC power into DC power, thereby ensuring current input at the DC input terminal and the AC input terminal of the load 107, achieving uninterrupted power supply to the load 107, and improving the reliability of the power supply device 100.

Figure 4 is a schematic diagram of power supply of another power supply device 100 provided in an embodiment of the present application. As shown in Figure 4, if the voltage output by the first input power supply 105 is less than the first threshold value, and the voltage output by the second input power supply 106 is greater than or equal to the second threshold value, the second input power supply 106 supplies power to the first input terminal of the load 107 through the inverter 103, and the second input power supply 106 supplies power to the second input terminal of the load 107.

When the voltage output by the first input power supply 105 is less than the first threshold value, it proves that the first input power supply 105 is faulty. At this time, the bidirectional inverter 103 is controlled to convert the second alternating current output by the second input power supply 106 into a second direct current, and the second direct current is transmitted to the first input terminal of the load 107. The first input terminal of the load 107 is powered by the second direct current. At this time, the first energy storage unit 101 does not participate in the power supply, thereby reducing the loss of the energy storage battery.

It should be understood that the rectifier 102 connected to the first input power supply 105 is in a redundant state at this time, so if the rectifier 102 is damaged, it will not affect the first energy storage unit 101 or the second input power supply 106 to supply power to the first input terminal and/or the second input terminal of the load 107.

In an embodiment of the present application, when the first input power supply 105 fails, the second input power supply 106 is controlled to simultaneously power the first input terminal and the second input terminal of the load 107, thereby maximizing the use of the external input power supply and reducing the discharge frequency of the first energy storage unit 101, thereby reducing the loss of the battery in the first energy storage unit 101 and increasing the life of the first energy storage unit 101 in the power supply device 100.

In a possible implementation, the first input power source 105 and the second input power source 106 are independent AC input power sources.

The first input power supply 105 and the second input power supply 106 are independent of each other, that is, they can output different currents with different voltages, frequencies, or phases. Therefore, when the first input power supply 105 fails, the second input power supply 106 can continue to supply power to the load 107. When the second input power supply 106 fails, the first input power supply 105 can continue to supply power to the load 107.

It should be understood that both the first input power supply 105 and the second input power supply 106 are AC input power supplies, that is, when the first input power supply 105 and the second input power supply 106 fail, it can be understood as a AC input failure.

In the embodiment of the present application, the first input power supply 105 and the second input power supply 106 are independent AC input power supplies, which ensures that in the event of a single input power supply failure, the remaining input power supply can continue to supply power to the load 107, thereby improving the stability of the power supply device 100 supplying power to the load 107.

Figure 5 is a schematic diagram of power supplying by another power supply device 100 provided in an embodiment of the present application, and Figure 6 is a schematic diagram of power supplying by another power supply device 100 provided in an embodiment of the present application. As shown in Figures 5 and 6, if the voltage output by the first input power supply 105 is greater than or equal to the first threshold value, and the voltage output by the second input power supply 106 is greater than or equal to the second threshold value, the first input power supply 105 supplies power to the first input terminal of the load 107, and the first input power supply 105 or the second input power supply 106 supplies power to the second input terminal of the load 107.

When both the first input power supply 105 and the second input power supply 106 are operating normally, the first input power supply 105 is controlled to supply power to the first input terminal of the load 107, and the first input power supply 105 or the second input unit is switched through the switching unit 104 to supply power to the second input terminal of the load 107. Among them, FIG5 shows a situation where the first input power supply 105 supplies power to the first input terminal of the load 107, and the second input power supply 106 supplies power to the second input terminal of the load 107. FIG6 shows a situation where the first input power supply 105 supplies power to the first input terminal and the second input terminal of the load 107 at the same time.

It should be understood that when the first input power supply 105 simultaneously supplies power to the first input terminal and the second input terminal of the load 107, if the failure of the second input power supply 106 does not affect the power supply to the load 107, the power supply device 100 can continue to supply power to the first input terminal and the second input terminal of the load 107 through the first input power supply 105.

It should also be understood that when both the first input power source 105 and the second input power source 106 are operating normally, the inverter 103 is in a hot standby operating state, that is, it does not participate in power supply.

In the embodiment of the present application, when the first input power supply 105 and the second input power supply 106 are both operating normally, the first input power supply 105 is controlled to supply power to the first input terminal of the load 107, and the first input power supply 105 or the second input power supply 106 is controlled to supply power to the second input terminal of the load 107, thereby realizing power supply to the dual-power supply load 107. During power supply, if the second power supply fails, the switching unit 104 can be used to switch to the first input power supply 105 for power supply, thereby ensuring the stability of power supply and improving the reliability of the power supply device 100.

In a possible implementation, the switching unit 104 is a static switching switch.

The switching unit 104 can be a static transfer switch (Static Transfer Switch, STS). The static transfer switch adopts a switching method of breaking before making. Since the switching time is extremely short, usually the switching action is completed within 0ms to 10ms, it can realize switching between different input power supplies without causing power outage of the load.

In an embodiment of the present application, the switching unit 104 is a static switching switch. When the switching switch switches the first input power supply 105 or the second input power supply 106 to supply power to the second input end of the load 107, the power supply will not be interrupted, thereby improving the stability of the power supply of the power supply device 100 and thus improving the reliability of the power supply device 100.

In a possible implementation, as shown in FIG5 and FIG6, when the first input power supply 105 or the second input power supply 106 supplies power to the second input terminal of the load 107, if the preset priority power supply rule is that the first input power supply 105 supplies power first, the first input terminal of the static switch is controlled to be turned on and the second input terminal is turned off, so that the first input power supply 105 supplies power to the second input terminal of the load 107. If the preset priority power supply rule is that the second input power supply 106 supplies power first, the second input terminal of the static switch is controlled to be turned on and the first input terminal is turned off, so that the second input power supply 106 supplies power to the second input terminal of the load 107.

A priority power supply rule is preset, and the priority power supply rule is used to indicate whether the first input power supply 105 is used first to supply power to the second input terminal of the load 107, or the second input power supply 106 is used first to supply power to the second input terminal of the load 107 when both the first input power supply 105 and the second input power supply 106 are used first to supply power to the second input terminal of the load 107. When the first input power supply 105 is used first to supply power, the static switching switch corresponding to the input terminal of the first input power supply 105 is turned on, and the input terminal corresponding to the second input power supply 106 is turned off, so that the first input power supply 105 supplies power to the first input terminal and the second input terminal of the load 107 at the same time, such as FIG5. When the second input power supply 106 is used first to supply power, the static switching switch corresponding to the input terminal of the second input power supply 106 is turned on, and the input terminal corresponding to the first input power supply 105 is turned off, so that the first input power supply 105 supplies power to the first input terminal of the load 107, and the second input power supply 106 supplies power to the second input terminal of the load 107, such as FIG6.

In an embodiment of the present application, the switching unit 104 switches the first input power supply 105 or the second input power supply 106 to power the second input end of the load 107 according to the priority power supply rule, thereby realizing uninterrupted power supply to the AC input side of the dual-power supply load 107, and when the first input power supply 105 or the second input power supply 106 fails, the other input power supply can be switched to power the second input end of the load 107, thereby improving the stability of power supply of the power supply device 100.

In a possible implementation, the switching unit 104 is an automatic switching switch, and the inverter 103 detects the disconnection time of the automatic switching switch. If the disconnection time exceeds a preset time threshold, the first energy storage unit 101 is controlled to supply power to the second input terminal of the load 107 through the inverter 103.

The switching unit 104 may be an automatic transfer switching equipment (ATS), but since there is a certain time interval in the switching process of the automatic transfer switch, the automatic transfer switch is in an off-circuit state during this interval, which may cause an interruption in the power supply to the load 107. The inverter 103 can detect the off-circuit time of the automatic transfer switch. When the off-circuit time exceeds a preset time threshold, the inverter 103 is turned on, so that the first energy storage unit 101 supplies power to the second input terminal of the load 107. When the automatic transfer switch is not in an off-circuit state, the inverter 103 remains in a hot backup state, and at this time, the first energy storage unit 101 does not supply power to the second input terminal of the load 107.

It should be understood that the preset time threshold is a time within which a circuit breaker will not cause a power interruption to the load 107. For example, a circuit breaker for the server and network equipment in the data center will not cause a power interruption within 20ms. When it exceeds 20ms, the power supply will be interrupted.

In the embodiment of the present application, the inverter 103 can detect the disconnection time of the automatic switching switch. If the disconnection time exceeds the preset time threshold, the first energy storage unit 101 is controlled to supply power to the second input terminal of the load 107 through the inverter 103, so that the automatic switching switch does not cause power interruption when switching. In the embodiment of the present application, the automatic switching switch is used to replace the static switching switch. The cost of the automatic switching switch is lower than that of the static switching switch, so the cost of the power supply device 100 can be reduced.

Figure 7 is a schematic diagram of another power supply device 100 provided in an embodiment of the present application. As shown in Figure 7, the first energy storage unit 101 includes an energy storage battery 1011 and an inverter 1012. The inverter 1012 is connected in series between the energy storage battery 1011 and the output end of the first energy storage unit 101, and is used to control the charging and discharging of the energy storage battery 1011.

The converter 1012 can control the charging and discharging of the energy storage battery 1011 in the first energy storage unit 101. When the load 107 is sufficiently powered, the converter 1012 controls the charging of the energy storage battery 1011 in the first energy storage unit 101. When the load 107 is insufficiently powered, the converter 1012 controls the discharging of the energy storage battery 1011 in the first energy storage unit 101.

It should be understood that the energy storage battery 1011 in the first energy storage unit 101 may be a single battery, or may be composed of a plurality of battery cells connected in series and/or in parallel, which is not limited in the embodiment of the present application.

In the embodiment of the present application, the first energy storage unit 101 includes an energy storage battery 1011 and an inverter 1012. The inverter 1012 can control the charging and discharging of the energy storage battery 1011, thereby ensuring that the energy storage battery 1011 is in a state of sufficient power. When the first input terminal and/or the second input terminal of the load 107 is insufficiently powered, the energy storage battery 1011 is controlled to discharge, and power is supplied to the load 107, thereby ensuring uninterrupted power supply to the load 107 and improving the reliability of the power supply device 100.

The present application also provides a power supply method, which is used for a power supply device 100, and the power supply device 100 includes: a first energy storage unit 101, a rectifier 102, an inverter 103 and a switching unit 104, one end of the rectifier 102 is connected to a first input power supply 105, the other end of the rectifier 102 is respectively connected to one end of the inverter 103, the first energy storage unit 101 and the first input end of the load 107, the other end of the inverter 103 is respectively connected to the output end of the switching unit 104 and the second input end of the load 107, the first input end and the second input end of the switching unit 104 are respectively connected to the first input power supply 105 and the second input power supply 106, and the first input power supply 105, the second input power supply 106 and the first energy storage unit 101 jointly supply power to the load 107. The power supply method includes: if the voltage output by the first input power supply 105 is less than a first threshold value, and the voltage output by the second input power supply 106 is less than a second threshold value, then controlling the first energy storage unit 101 to supply power to the first input terminal of the load 107, and controlling the first energy storage unit 101 to supply power to the second input terminal of the load 107 through the inverter 103.

In the embodiment of the present application, it is determined whether the voltage output by the first input power supply 105 exceeds a first threshold value and whether the voltage output by the second input power supply 106 exceeds a second threshold value, thereby controlling the first energy storage unit 101 to supply power to the first input terminal and the second input terminal of the load 107 according to the judgment result, thereby ensuring uninterrupted power supply to the load 107 when the AC power input fails, making the power supply device 100 independent of the reliability of the AC power, and improving the reliability of the power supply device 100.

In one possible implementation, the power supply method also includes: if the voltage output by the first input power supply 105 is less than a first threshold value, and the voltage output by the second input power supply 106 is greater than or equal to a second threshold value, then controlling the first energy storage unit 101 to supply power to the first input terminal of the load 107, and controlling the second input power supply 106 to supply power to the second input terminal of the load 107.

In one possible implementation, the power supply method also includes: if the voltage output by the first input power supply 105 is less than a first threshold value, and the voltage output by the second input power supply 106 is greater than or equal to a second threshold value, then controlling the second input power supply 106 to supply power to the first input terminal of the load 107 through the inverter 103, and controlling the second input power supply 106 to supply power to the second input terminal of the load 107.

In one possible implementation, the power supply method also includes: if the voltage output by the first input power supply 105 is greater than or equal to a first threshold, and the voltage output by the second input power supply 106 is greater than or equal to a second threshold, then controlling the first input power supply 105 to supply power to the first input terminal of the load 107, and controlling the first input power supply 105 or the second input power supply 106 to supply power to the second input terminal of the load 107.

FIG8 is a schematic diagram of a power supply system 200 provided in an embodiment of the present application. As shown in FIG8 , the power supply system 200 includes at least one of the above-mentioned power supply devices 100, as well as a second input power source 106 and at least one first input power source 105. Each first input power source 105 includes a power distribution cabinet 205 and a city grid input unit 203 and a generator 204 connected to the input end of the power distribution cabinet 205. The output end of the power distribution cabinet 205 is connected to one end of the rectifier 102 in the power supply device 100 and the first input end of the switching unit 104, wherein the first input power source 105 corresponds to the power supply device 100 one by one. The second input power supply 106 includes a power distribution cabinet 205, a city grid input unit 203 and a generator 204 connected to the input end of the power distribution cabinet 205, an uninterruptible power supply 201, and a second energy storage unit 202. The output end of the power distribution cabinet 205 is connected to the first input end of the uninterruptible power supply 201, the output end of the second energy storage unit 202 is connected to the second input end of the uninterruptible power supply 201, and the output end of the uninterruptible power supply 201 is respectively connected to the second input end of the switching unit 104 in each power supply device 100. When the power supply system 200 is applied, if the voltage output by the first input power supply 105 in each power supply device 100 is less than the first threshold value, and the voltage output by the second input power supply 106 is less than the second threshold value, the first energy storage unit 101 is controlled to supply power to the first input end of the load 107, and the first energy storage unit 101 is controlled to supply power to the second input end of the load 107 through the inverter 103.

It should be understood that the mains input unit 203 , the generator 204 and the power distribution cabinet 205 in the first input power source 105 and the second input unit 106 are all the same, and only the mains to which the mains input unit 203 is connected is different.

The power supply system 200 has multiple first input power supplies 105, and the multiple first input power supplies 105 are connected to the multiple power supply devices 100 in a one-to-one manner. Different first input power supplies 105 are connected to different power supply devices 100. The uninterruptible power supply 201 and the second input power supply 106 as a whole serve as the third input power supply of each power supply device 100, and the second input end of the switching unit 104 in each power supply device 100 is connected to the output end of the uninterruptible power supply 201 in the third input power supply.

In the embodiment of the present application, multiple power supply devices 100 correspond one-to-one to multiple first input power supplies 105, and all power supply devices 100 are connected to the output end of the uninterruptible power supply device 201 in the same second input power supply, so that uninterruptible power supply can be provided to multiple loads 107. Since there is only one second input power supply 106, the cost of the power supply system 200 is reduced, and since the system is composed of multiple power supply devices 100 that do not rely on the reliability of the mains, the system has higher reliability.

In a possible implementation, if the voltage output by the second input power source 106 and/or the mains input unit 203 in each first input power source 105 is less than a third threshold, the power distribution cabinet 205 is controlled to switch to the generator 204 to supply power to the power supply device 100 .

A third threshold is preset, and the third threshold is used to indicate whether the voltage input by the mains input unit 203 in the second input power supply 106 and/or each first input power supply 105 meets the voltage required by the load 107. When each distribution cabinet 205 in the system detects that the voltage input by the mains input unit 203 is less than the third threshold, it switches to the generator 204 for power supply and supplies power to the load 107 through the power supply device 100.

FIG9 is a schematic diagram of another power supply system 200 provided by an embodiment of the present application. As shown in FIG9 , specifically, the power distribution cabinet 205 is an automatic switching switch. When the automatic switching switch detects that the voltage output by the mains input unit 203 is less than the third threshold value, the mains input unit 203 side of the automatic switching switch is disconnected, the generator 204 is started and the generator 204 side is turned on, so that the power supply can be switched to the generator 204, thus realizing the switching of the power supply. A controller is also provided in the power supply system 200, and the controller can control the power supply system 200 to work in different modes, for example: controlling the first energy storage unit 101 to supply power to the first input end of the load 107, and controlling the first energy storage unit 101 to supply power to the second input end of the load 107 through the inverter 103, controlling the on and off of the static switching switch, and so on.

In an embodiment of the present application, if the voltage output by each mains power input unit 203 is less than a third threshold, the power distribution cabinet 205 switches to the generator 204 for power supply, that is, if the mains power fails, it switches to the generator 204 to output AC power. Therefore, the power supply to the load 107 does not rely on the reliability of the mains power, and thus the power supply system 200 has higher reliability.

In one possible implementation, if the voltage output by the municipal grid input unit 203 in the second input power supply 106 is less than a third threshold, and/or the voltage output by the generator 204 is less than the third threshold, the second energy storage unit 202 is controlled to supply power to the power supply device 100 through the uninterruptible power supply device 201.

It should be understood that when the first input power supply 105 fails, that is, when the mains fails, the first energy storage unit 101 supplies power to the first input terminal of the load 107, so the power supply to the first input terminal of the load 107 does not rely on the reliability of the mains.

In an embodiment of the present application, when the second input power supply 106 fails, that is, the voltage output by the mains power grid and/or the generator 204 is less than the power supply voltage required by the load 107, the second energy storage unit 202 is controlled to supply power to each power supply device 100 through the uninterruptible power supply device 201, thereby achieving uninterruptible power supply to the load 107. Since the uninterruptible power supply device 201 and the second energy storage unit 202 can supply power to the second input end of each load 107 in the event of a mains power input failure, the system does not rely on the reliability of the mains, that is, even when the reliability of the mains is low, the load 107 can be stably powered, so the power supply system 200 has high reliability.

In one possible implementation, if the voltage output by the first input power supply 105 in the power supply system 200 is less than the first threshold value and lasts for a period of time greater than the first time threshold value, and the input voltage at the second input terminal of the switching unit 104 is greater than or equal to the second threshold value and lasts for a period of time greater than the first time threshold value, the switching unit 104 is controlled to switch to the second input power supply 106 to power the first input terminal and/or the second input terminal of the load 107.

It should be understood that the second input power supply 106 includes an uninterruptible power supply 201 and a second energy storage unit 202. When the voltage output by the first input power supply 105 is less than the first threshold value, and the voltage output by the second input power supply 106 connected to the second input end of the switching unit 104, that is, the uninterruptible power supply 201, is greater than the second threshold value, the duration of this state is judged. If the duration exceeds the first time threshold, the switching unit 104 switches to the second input end, so that the second input power supply 106 supplies power to the first input end and/or the second input end of the load 107.

It should also be understood that if the voltage output by the mains input unit 203 is less than the first threshold, the power supply will be preferentially switched to the generator 204 through the distribution cabinet 205, and the switching process will not exceed the first time threshold. If the duration of the voltage output by the mains input unit 203 being less than the first threshold is greater than the first time threshold, proving that the switching has failed or the voltage output by the generator 204 is less than the first threshold, then the switching unit 104 is started to switch to the second input power supply 106 to supply power to the first input terminal and/or the second input terminal of the load 107.

In an embodiment of the present application, if the voltage output by the first input power supply 105 in the power supply system 200 is less than the first threshold value, the voltage at the second input terminal of the switching unit 104 is greater than or equal to the second threshold value, and the duration of this state is greater than the first time threshold value, the switching switch is controlled to switch to the second input power supply 106 to supply power to the first input terminal and/or the second input terminal of the load 107, thereby achieving timely switching to the second input power supply 106 to supply power to the load 107 when the first input power supply 105 fails, thereby ensuring uninterrupted power supply to the load 107 and improving the reliability of power supply of the power supply system 200.

It should be pointed out that, according to the needs of implementation, the various components/steps described in the embodiments of the present application can be split into more components/steps, or two or more components/steps or partial operations of components/steps can be combined into new components/steps to achieve the purpose of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the units and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of the present application.

The above implementation methods are only used to illustrate the embodiments of the present application, and are not limitations on the embodiments of the present application. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the embodiments of the present application. Therefore, all equivalent technical solutions also belong to the scope of the embodiments of the present application. The scope of patent protection of the embodiments of the present application should be limited by the claims.

Claims

A power supply device comprises: a first energy storage unit, a rectifier, an inverter and a switching unit;

One end of the rectifier is connected to a first input power source, the other end of the rectifier is respectively connected to one end of the inverter, the output end of the first energy storage unit and the first input end of the load, the other end of the inverter is respectively connected to the output end of the switching unit and the second input end of the load, the first input end and the second input end of the switching unit are respectively connected to the first input power source and the second input power source, and the first input power source, the second input power source and the first energy storage unit jointly supply power to the load;

If the voltage output by the first input power supply is less than a preset first threshold value, and the voltage output by the second input power supply is less than a preset second threshold value, the first energy storage unit is used to supply power to the first input end of the load, and the first energy storage unit is used to supply power to the second input end of the load through the inverter.
The device according to claim 1, wherein if the voltage output by the first input power supply is less than the first threshold value and the voltage output by the second input power supply is greater than or equal to the second threshold value, the first energy storage unit supplies power to the first input terminal of the load and the second input power supply supplies power to the second input terminal of the load.
The device according to claim 1, wherein the first input terminal of the load is a DC input terminal, and the second input terminal of the load is an AC input terminal.
The device according to claim 3, wherein the inverter is a bidirectional inverter, and the inverter can convert the first direct current output by the first energy storage unit into a first alternating current, and transmit the first alternating current to the second input terminal of the load, or convert the second alternating current output by the second input power supply into a second direct current, and transmit the second direct current to the first input terminal of the load.
The device according to claim 4, wherein if the voltage output by the first input power supply is less than the first threshold value, and the voltage output by the second input power supply is greater than or equal to the second threshold value, the second input power supply supplies power to the first input terminal of the load through the inverter, and the second input power supply supplies power to the second input terminal of the load.
The device according to claim 1, wherein the first input power source and the second input power source are independent AC input power sources.
The device according to any one of claims 1 to 6, wherein if the voltage output by the first input power supply is greater than or equal to the first threshold value, and the voltage output by the second input power supply is greater than or equal to the second threshold value, the first input power supply supplies power to the first input terminal of the load, and the first input power supply or the second input power supply supplies power to the second input terminal of the load.
The device according to claim 7, wherein the switching unit is a static switching switch.
The device according to claim 8, wherein the first input power source or the second input power source supplies power to the second input terminal of the load, comprising:

If the preset priority power supply rule is that the first input power source is prioritized for power supply, the first input end of the static switch is turned on and the second input end is turned off, so that the first input power source supplies power to the second input end of the load;

If the preset priority power supply rule is that the second input power source is given priority, the second input end of the static switch is turned on and the first input end is turned off, so that the second input power source supplies power to the second input end of the load.
The device according to claim 1, wherein the switching unit is an automatic switching switch, and the inverter detects the disconnection time of the automatic switching switch, and if the disconnection time exceeds a preset time threshold, the first energy storage unit supplies power to the second input terminal of the load through the inverter.
The device according to claim 1, wherein the first energy storage unit comprises an energy storage battery and a converter;

The converter is connected in series between the energy storage battery and the output end of the first energy storage unit, and is used to control the charging and discharging of the energy storage battery.
A power supply method is applied to a power supply device, the power supply device comprising: a first energy storage unit, a rectifier, an inverter and a switching unit, one end of the rectifier is connected to a first input power supply, the other end of the rectifier is respectively connected to one end of the inverter, the first energy storage unit and the first input end of a load, the other end of the inverter is respectively connected to the output end of the switching unit and the second input end of the load, the first input end and the second input end of the switching unit are respectively connected to the first input power supply and the second input power supply, the first input power supply, the second input power supply and the first energy storage unit jointly supply power to the load, wherein the power supply method comprises:

If the voltage output by the first input power supply is less than a first threshold value, and the voltage output by the second input power supply is less than a second threshold value, the first energy storage unit is controlled to supply power to the first input end of the load, and the first energy storage unit is controlled to supply power to the second input end of the load through the inverter.
The method according to claim 12, wherein the method further comprises: if the voltage output by the first input power supply is less than the first threshold value, and the voltage output by the second input power supply is greater than or equal to the second threshold value, then controlling the first energy storage unit to supply power to the first input terminal of the load, and controlling the second input power supply to supply power to the second input terminal of the load.
The method according to claim 12, wherein the method further comprises: if the voltage output by the first input power supply is less than the first threshold value, and the voltage output by the second input power supply is greater than or equal to the second threshold value, then controlling the second input power supply to supply power to the first input terminal of the load through the inverter, and controlling the second input power supply to supply power to the second input terminal of the load.
The method according to claim 12, wherein the method further comprises: if the voltage output by the first input power supply is greater than or equal to the first threshold value, and the voltage output by the second input power supply is greater than or equal to the second threshold value, then controlling the first input power supply to supply power to the first input terminal of the load, and controlling the first input power supply or the second input power supply to supply power to the second input terminal of the load.
A power supply system, comprising: at least one power supply device according to any one of claims 1 to 11, and a second input power source and at least one first input power source;

Each of the first input power sources comprises a power distribution cabinet and a mains power grid input unit connected to an input end of the power distribution cabinet, wherein an output end of the power distribution cabinet is connected to one end of a rectifier in the power supply device and a first input end of a switching unit, wherein the first input power sources and the power supply devices correspond one to one;

The second input power source includes a power distribution cabinet, a mains power grid input unit connected to the input end of the power distribution cabinet, an uninterruptible power supply device and a second energy storage unit, the output end of the power distribution cabinet is connected to the first input end of the uninterruptible power supply device, the output end of the second energy storage unit is connected to the second input end of the uninterruptible power supply device, and the output end of the uninterruptible power supply device is respectively connected to the second input end of the switching unit in each of the power supply devices;

If the voltage output by the first input power supply in each of the power supply devices is less than a first threshold value, and the voltage output by the second input power supply is less than a second threshold value, the first energy storage unit is controlled to supply power to the first input end of the load, and the first energy storage unit is controlled to supply power to the second input end of the load through the inverter.
The system according to claim 16, wherein, if the voltage output by the first input power supply is less than a first threshold value and lasts for a longer time than a first time threshold value, and the input voltage at the second input terminal of the switching unit is greater than or equal to a second threshold value and lasts for a longer time than the first time threshold value, the switching unit is controlled to switch to the second input power supply to power the first input terminal and/or the second input terminal of the load.