Uninterruptible power supply with impact current suppression, and control method and device of uninterruptible power supply

Abstract

The invention provides an uninterruptible power supply with an impact current suppression function and a control method and device of the uninterruptible power supply. The uninterruptible power supply comprises a first switch unit, a first contact unit, a second contact unit, a first buffer unit, a second buffer unit, a power factor correction unit, a rectification unit and a voltage transformation unit, and the first switch unit is respectively connected with the first contact unit and the second contact unit; the first contact unit, the voltage transformation unit and the power factor correction unit are connected in sequence; the second contact unit, the rectification unit and the first buffer unit are connected in sequence and then are connected to a first node of the power factor correction unit; one end of the second buffer unit is connected to a connecting line between the first contact unit and the transformation unit, and the other end of the second buffer unit is connected to a connecting line between the second contact unit and the rectification unit; wherein in response to the access of the commercial power through the first switch unit, the closing of the second contact unit is controlled to be earlier than the closing of the first contact unit, so as to suppress the impact current when the commercial power is accessed.

Description

Technical Field

[0001] The present application relates to power supply technology, and more particularly to an uninterruptible power supply with surge current suppression, and a control method and device for the uninterruptible power supply. Background Art

[0002] The old logic of the UPS power-on control is that in some scenarios where the UPS is connected to the mains, the main contactor will be directly closed to supply power directly to the outside. This control method has a large excitation current, which can cause the input circuit breaker to trip, that is, the UPS is disconnected from the mains, and the stability and reliability of the UPS are low. Summary of the invention

[0003] Embodiments of the present application provide an uninterruptible power supply with surge current suppression, a control method, a device, an electronic device, a storage medium, and a computer program product for the uninterruptible power supply, which can improve the stability and reliability of the uninterruptible power supply.

[0004] The technical solution of the embodiment of the present application is implemented as follows:

[0005] The embodiment of the present application provides an uninterruptible power supply with inrush current suppression, comprising: a first switch unit, a first contact unit, a second contact unit, a first buffer unit, a second buffer unit, a power factor correction unit, a rectifier unit, and a transformer unit, wherein:

[0006] The first switch unit is connected to the first contact unit and the second contact unit respectively;

[0007] The first contact unit, the voltage transformation unit, and the power factor correction unit are connected in sequence;

[0008] The second contact unit, the rectifying unit, and the first buffer unit are connected in sequence and then connected to the first node of the power factor correction unit;

[0009] One end of the second buffer unit is connected to the connection line between the first contact unit and the voltage transformation unit, and the other end is connected to the connection line between the second contact unit and the rectification unit;

[0010] In response to the mains being connected via the first switch unit, the second contact unit is controlled to be closed earlier than the first contact unit, so as to suppress the inrush current when the mains is connected.

[0011] In the above scheme, the power factor correction unit includes: an energy storage circuit and a rectifier circuit; wherein;

[0012] The first end of the energy storage circuit is connected to the voltage transformation unit, and the second end of the energy storage circuit is connected to the rectifier circuit;

[0013] The rectifier circuit is connected to the first node and the second node, wherein when the uninterruptible power supply works normally, the potential of the first node is greater than the potential of the second node.

[0014] In the above scheme, the uninterruptible power supply also includes: an energy storage unit, an inverter unit connected in sequence, a first voltage regulating unit and a second switch unit; wherein the energy storage unit and the rectifier circuit included in the power factor correction unit are connected in parallel between the first node and the second node; one end of the inverter unit is connected to the power factor correction unit, and the other end is connected to the first voltage regulating unit, and the second switch unit is connected to the power load.

[0015] In the above solution, the uninterruptible power supply further comprises: a third switch unit and a fourth switch unit, wherein;

[0016] One end of the third switch unit is connected to the third node, and the other end is connected to the fourth node via the second voltage regulating unit; the third node can be connected to the mains; the fourth node is located at the connection line between the first voltage regulating unit and the second switch unit;

[0017] One end of the fourth switch unit is connected to the third node, and the other end is connected between the second switch unit and the power load.

[0018] In the above solution, the uninterruptible power supply is a three-phase uninterruptible power supply, wherein the transformer unit is a three-phase isolation transformer.

[0019] The present application provides a method for controlling an uninterruptible power supply, including:

[0020] Controlling the second contact unit included in the uninterruptible power supply to close at a first time, and controlling the first contact unit included in the uninterruptible power supply to close at a second time, so as to buffer the transformer unit and the power factor correction unit included in the uninterruptible power supply, so as to suppress the impact current when connecting to the mains;

[0021] Among them, the first time is earlier than the second time; the second contact unit and the first contact unit can both be connected to the mains via the first switch unit; the first contact unit is connected to the transformer unit; the transformer unit is used to isolate the power factor correction unit from the mains; the second contact unit is connected to the transformer unit via a second buffer resistor, and is connected to the first node of the power factor correction unit via a first buffer resistor; when the uninterruptible power supply works normally, the first node is connected to a positive voltage.

[0022] In the above scheme, the method further includes:

[0023] After the second time, delaying for a first time period to control the second contact unit to open;

[0024] After the switch is opened, a second time period is delayed to control the power factor correction unit to operate.

[0025] In the above scheme, the method further includes:

[0026] In response to the uninterruptible power supply being turned on for the first time or the mains power being abnormally restored, the time interval between the second time and the first time is a first time interval;

[0027] In response to the uninterruptible power supply being turned on immediately after being turned off, the time interval between the second time and the first time is a second time interval; wherein the second time interval is less than or equal to the first time interval.

[0028] In the above solution, the first time duration corresponding to the first startup of the uninterruptible power supply or abnormal recovery of the mains power is greater than or equal to the first time duration corresponding to the startup of the uninterruptible power supply immediately after shutdown.

[0029] The present application provides a control device for an uninterruptible power supply, including:

[0030] A control module, used to control the second contact unit included in the uninterruptible power supply to close at a first time, and control the first contact unit included in the uninterruptible power supply to close at a second time, so as to buffer the transformer unit included in the uninterruptible power supply and the power factor correction unit included therein, so as to suppress the impact current when connecting to the mains;

[0031] Among them, the first time is earlier than the second time; the second contact unit and the first contact unit can both be connected to the mains via the first switch unit; the first contact unit is connected to the transformer unit; the transformer unit is used to isolate the power factor correction unit from the mains; the second contact unit is connected to the transformer unit via a second buffer resistor, and is connected to the first node of the power factor correction unit via a first buffer resistor; when the uninterruptible power supply works normally, the first node is connected to a positive voltage.

[0032] An embodiment of the present application provides an electronic device, including:

[0033] A memory for storing executable instructions;

[0034] The processor is used to implement the control method of the uninterruptible power supply provided in the embodiment of the present application when executing the executable instructions stored in the memory.

[0035] An embodiment of the present application provides a computer-readable storage medium storing executable instructions for causing a processor to execute and implement the control method of an uninterruptible power supply provided in the embodiment of the present application.

[0036] An embodiment of the present application provides a computer program product storing a computer program for implementing the control method of an uninterruptible power supply provided in the embodiment of the present application when executed by a processor.

[0037] In the embodiment of the present application, the second contact unit is closed earlier than the first contact unit, so that the first buffer unit and the second buffer unit can be used to buffer the power factor correction unit and the transformer unit, and then the first contact unit is closed to supply power to the outside, thereby suppressing the excitation impact current when connecting to the mains, avoiding frequent tripping of the mains switch, and improving the stability and reliability of the uninterruptible power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of an optional circuit structure of an uninterruptible power supply provided in an embodiment of the present application;

[0039] Figure 2 This is a schematic diagram of an optional circuit structure of an uninterruptible power supply provided in an embodiment of the present application;

[0040] Figure 3 This is a schematic diagram of an optional circuit structure of an uninterruptible power supply provided in an embodiment of the present application;

[0041] Figure 4 This is a schematic diagram of an optional circuit structure of an uninterruptible power supply provided in an embodiment of the present application;

[0042] Figure 5 This is a schematic diagram of an optional circuit structure of an uninterruptible power supply provided in an embodiment of the present application;

[0043] Figure 6 is an optional structural diagram of a control system 600 of an uninterruptible power supply provided in an embodiment of the present application;

[0044] Figure 7 is an optional structural diagram of an electronic device 700 provided in an embodiment of the present application;

[0045] Figure 8 It is an optional flow chart of the control method of the uninterruptible power supply provided in the embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0047] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0048] In the following description, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described here can be implemented in an order other than that illustrated or described here.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0050] Before further describing the embodiments of the present application in detail, the nouns and terms involved in the embodiments of the present application are explained. The nouns and terms involved in the embodiments of the present application are subject to the following interpretations.

[0051] 1) Uninterruptible Power Supply (UPS) is an uninterruptible power supply with energy storage device. It is mainly used to provide uninterruptible power supply to some equipment with high requirements on power supply stability.

[0052] When the mains input is normal, the UPS stabilizes the mains and supplies it to the load. At this time, the UPS is an AC voltage stabilizer, and it also charges the battery inside the machine. When the mains power is interrupted (power outage), the UPS immediately switches the DC power of the battery to the load through the inverter to continue to supply 220V AC power, so that the load maintains normal operation and protects the load software and hardware from damage. UPS equipment usually provides protection against overvoltage or undervoltage.

[0053] 2) The full name of Power Factor Correction (PFC) is Power Factor, which refers to the relationship between effective power and total power consumption (apparent power), that is, the ratio of effective power to total power consumption (apparent power). Basically, the power factor can measure the degree to which electricity is effectively used. The larger the power factor value, the higher the power utilization rate.

[0054] 3) The main contactor is the main switching device that controls the charging and discharging process of the battery system. It has functions such as circuit breaker, overload protection, overvoltage protection and undervoltage protection, which can ensure the safe and reliable operation of the battery system.

[0055] 4) Buffer contactor, responsible for safe power off of the output end and buffering the bus voltage.

[0056] Embodiments of the present application provide an uninterruptible power supply with surge current suppression, a control method, a device, an electronic device, and a computer-readable storage medium for the uninterruptible power supply, which can improve the stability and reliability of the uninterruptible power supply.

[0057] The following is a description of the uninterruptible power supply with surge current suppression provided in the embodiment of the present application. Figure 1 , Figure 1 1 is an optional circuit structure diagram of an uninterruptible power supply with inrush current suppression provided in an embodiment of the present application, wherein the uninterruptible power supply 100 comprises: a first switch unit 101, a first contact unit 102, a second contact unit 103, a first buffer unit 104, a second buffer unit 105, a power factor correction unit 106, a rectifier unit 107, and a transformer unit 108, wherein the first switch unit 101 is connected to the first contact unit 102 and the second contact unit 103 respectively; the first contact unit 102, the transformer unit 108, and the power factor correction unit 106 are connected in sequence; The second contact unit 103, the rectifier unit 107, and the first buffer unit 104 are connected in sequence and connected to the first node 1061 of the power factor correction unit 106; one end of the second buffer unit 105 is connected to the connection line between the first contact unit 102 and the transformer unit 108, and the other end is connected to the connection line between the second contact unit 103 and the rectifier unit 107; wherein, in response to the connection to the mains via the first switch unit 101, the closing of the second contact unit 103 is controlled earlier than the closing of the first contact unit 102 to suppress the inrush current when the mains is connected.

[0058] In actual implementation, the uninterruptible power supply 100 is connected to the mains through the first switch unit 101, and the first switch unit 101 is the mains switch. The first switch unit 101 is connected to the first contact unit 102 and the second contact unit 103 respectively. In the embodiment of the present application, the first contact unit 102 is the main switch device of the charging or discharging process of the uninterruptible power supply 100, and the second contact unit 103 is used to buffer the bus voltage. In one embodiment, the first contact unit 102 is a main contactor, and the second contact unit 103 is a buffer contactor. The first contact unit 102, the transformer unit 108, and the power factor correction unit 106 are connected in sequence. When the first contact unit 102 is closed, the mains can directly reach the transformer unit 108 and the power factor correction unit 106 through the first switch unit 101 and the first contact unit 102 in sequence. After the second contact unit 103, the rectifier unit 107, and the first buffer unit 104 are connected in sequence, they are connected to the first node 1061 of the power factor correction unit 106. After the second contact unit 103 is closed, the city power can reach the transformer unit 108 through the first switch unit 101, the second contact unit 103, the first buffer unit 104, and pass through the first switch unit 101, the second contact unit 103, the rectifier unit 107 and the second buffer unit 109. Here, the first buffer unit 104 can be a buffer resistor, and the second buffer unit 105 can also be a buffer resistor. The rectifier unit 107 can be a rectifier bridge, the transformer unit 108 can be an isolation transformer, and the power factor correction unit 106 can be a power factor correction (PFC) circuit. The first node 1061 is a bus node of the power factor correction unit 106. In some embodiments, the uninterruptible power supply 100 is a three-phase uninterruptible power supply, wherein the transformer unit 108 is a three-phase isolation transformer.

[0059] In actual implementation, in response to the first switch unit 101 being connected to the mains, the second contact unit 103 is controlled to be closed before the first contact unit 102 is controlled to be closed. Here, by first controlling the second contact unit 103 to be closed, the mains can buffer the transformer unit 108 through the second contact unit 103 and the first buffer unit 104, and buffer the power factor correction unit 106 through the second contact unit 103, the rectifier unit 107, and the second buffer unit 105. By buffering the busbars of the transformer unit 108 and the power factor correction unit 106, it is possible to avoid directly closing the first contact unit 102, which causes the excitation current of the transformer unit 108 to be too large, causing the first switch unit 101 to trip, and at the same time, buffer the busbar voltage of the power factor correction unit 106 to ensure the stable operation of the power factor correction unit 106. After the buffering is completed, the first contact unit 102 is controlled to close, so that the city power reaches the transformer unit 108 through the first switch unit 101 and the first contact unit 102, and reaches the power factor correction unit 106 after being transformed by the transformer unit 108, and supplies power to the power load of the uninterruptible power supply 100 after passing through the power factor correction unit 106.

[0060] In the embodiment of the present application, the second contact unit is closed earlier than the first contact unit, so that the first buffer unit and the second buffer unit can be used to buffer the power factor correction unit and the transformer unit, and then the first contact unit is closed to supply power to the outside, thereby suppressing the excitation impact current when connecting to the mains, avoiding frequent tripping of the mains switch, and improving the stability and reliability of the uninterruptible power supply.

[0061] In some embodiments, see Figure 2 , Figure 2 It is an optional circuit structure diagram of the uninterruptible power supply provided in an embodiment of the present application, wherein the power factor correction unit 106 comprises: a tank circuit 201 and a rectifier circuit 202; wherein; a first end of the tank circuit 201 is connected to the transformer unit 108, and a second end thereof is connected to the rectifier circuit 202; the rectifier circuit 202 is connected to the first node 1061 and the second node 1062, wherein, when the uninterruptible power supply 100 is working normally, the potential of the first node 1061 is greater than the potential of the second node 1062.

[0062] In actual implementation, the energy storage circuit 201 includes an inductor for storing electric energy. The rectifier circuit 202 can be a three-phase bridge rectifier circuit for rectifying the mains. Here, the rectifier circuit 202 is connected between the first node 1061 and the second node 1062, so that the mains provides voltage to the power factor correction unit 106 through the first node 1061 and the second node 1062. Here, the potential of the first node 1061 is higher than the potential of the second node 1062. The energy storage circuit 201 can enable the power factor correction unit 106 to have an energy storage function, and the energy storage circuit 201 with an inductor can also reduce electromagnetic interference noise in the circuit. In addition, the rectifier circuit 202 converts the alternating current into direct current, etc.

[0063] In some embodiments, see Figure 3 , Figure 3 1 is an optional circuit structure diagram of an uninterruptible power supply provided in an embodiment of the present application, wherein the uninterruptible power supply 100 further includes:

[0064] An energy storage unit 301, an inverter unit 302, a first voltage regulating unit 303 and a second switch unit 304 connected in sequence; wherein the energy storage unit 301 and the rectifier circuit 202 included in the power factor correction unit 106 are connected in parallel between the first node 1061 and the second node 1062; one end of the inverter unit 302 is connected to the power factor correction unit 106, and the other end is connected to the first voltage regulating unit 303, and the second switch unit 304 is connected to the power load 305.

[0065] Here, the energy storage unit 301 may include an inductor and / or a capacitor, and energy may be stored through the inductor and / or the capacitor. The inverter unit 302 may be an inverter. The first voltage regulating unit 303 may be a bidirectional thyristor. The second switch unit 304 is connected between the first voltage regulating unit 302 and the electrical load 305. The energy storage unit 301 is also connected to the energy storage battery of the uninterruptible power supply 100. The energy storage battery may be connected to the energy storage unit 301 through the fifth node 306 and the sixth node 307. The mains electricity may charge the energy storage battery through the first node 1061 and the second node 1062 through the energy storage unit 301. When the mains electricity cannot supply power normally, the energy storage battery may supply power to the electrical load 305.

[0066] In some embodiments, see Figure 4 , Figure 4It is an optional circuit structure diagram of the uninterruptible power supply provided in an embodiment of the present application, and the uninterruptible power supply 100 also includes: a third switch unit 401 and a fourth switch unit 402, wherein; one end of the third switch unit 401 is connected to the third node 404, and the other end is connected to the fourth node 405 via the second voltage regulating unit 403; the third node 404 can be connected to the mains; the fourth node 405 is located at the connecting line between the first voltage regulating unit 303 and the second switch unit 304; one end of the fourth switch unit 402 is connected to the third node 404, and the other end is connected between the second switch unit 304 and the power load 305.

[0067] In actual implementation, the third switch unit 401 is used to close the switch in response to a switch closing instruction for the power factor correction unit 106 when the power factor correction unit 106 fails, so that the city power directly supplies power to the power load 305 through the closed third switch unit 401 and the second switch unit 304. The fourth switch unit 402 is used to close the switch in response to a closing instruction for the fourth switch unit 402, so as to short-circuit the uninterruptible power supply 100, thereby facilitating the maintenance and repair of the uninterruptible power supply 100.

[0068] The following is an explanation of an exemplary application of the embodiments of the present application in a practical application scenario.

[0069] In actual implementation, the city power is connected to the uninterruptible power supply 100 through three-phase lines (i.e., A phase line, B phase line, and C phase line) and the neutral line N. The first switch unit 101, the second switch unit 304, the third switch unit 401, and the fourth switch unit 402 each include three switches connected one-to-one with the three-phase lines. The transformer unit 108 is an isolation transformer. The energy storage circuit 201 includes three inductors connected one-to-one with the three-phase lines. The first voltage regulating unit 303 is a bidirectional thyristor. The first switch unit 101, the first contact unit 102, the transformer unit 108, the energy storage circuit 201, the rectifier circuit 202, the inverter unit 302, the first voltage regulating unit 303, and the second switch unit 304 are sequentially connected in series on the three-phase line. The power load 305 can be connected to the uninterruptible power supply 100 through the second switch unit 304. One end of the second contact unit 103 is connected to the connecting line between the first switch unit 101 and the first contact unit 102, and the other end is connected to the rectifier unit 107. The rectifier unit 107 is connected between the second contact unit 103 and the first buffer unit 104, and the first buffer unit 104 is connected between the second contact unit 103 and the first node 1061. The first buffer unit 104 includes a resistor. The power factor correction unit 106 is connected between the first node 1061 and the second node 1062. The first node 1061 is located on the busbar of the power factor correction unit 1061. One end of the second buffer unit 105 is connected to the second contact unit 103, and the other end is connected to the connection line between the first contact unit 102 and the transformer unit 108. The second buffer unit 105 includes three resistors, each of which is connected to a phase line. One end of the third switch unit 401 is connected to the third node 404, and the other end is connected to the fourth node 405 through the second voltage regulating unit 403. Here, the second voltage regulating unit 403 is also a bidirectional thyristor. One end of the fourth switch unit 402 is connected to the third node 404, and the other end is connected between the second switch unit 304 and the power load 305. Here, the third node 404 is directly connected to the mains. Figure 5 , Figure 5 It is an optional circuit structure diagram of the impact current suppression circuit provided in an embodiment of the present application. The impact current suppression circuit also includes: a first energy storage module 502 and a second energy storage module 503. The first energy storage module 501 and the second energy storage module 502 each include three capacitors. The first energy storage unit 501 is connected to the connection line between the first switch unit and the first contact unit 102. The second energy storage unit 502 is connected to the connection line between the inverter 302 and the first voltage regulating unit 303. A bus capacitor 503 is also connected between the power factor correction unit 106 and the inverter unit 302.

[0070] The following is a description of the control system of the uninterruptible power supply provided in the embodiment of the present application. Figure 6 , Figure 66 is an optional structural diagram of a control system 600 of an uninterruptible power supply provided in an embodiment of the present application, wherein a controller 601 is connected to an uninterruptible power supply 100. Here, the controller 601 can control the opening and closing of a first contact unit 102 and a second contact unit 103 in the uninterruptible power supply 100.

[0071] Next, the electronic device for implementing the control method of the uninterruptible power supply provided in the embodiment of the present application is described. Figure 7 , Figure 7 is an optional structural diagram of an electronic device 700 provided in an embodiment of the present application. In practical applications, the electronic device 700 can be implemented as Figure 6 Controller 601 in.

[0072] Figure 2 The electronic device 700 shown includes: at least one processor 701 and a memory 702. The various components in the electronic device 700 are coupled together via 73. It can be understood that the bus system 703 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 703 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, the bus system 703 is not shown in FIG. Figure 2 Various buses are labeled as bus system 703.

[0073] Processor 701 can be an integrated circuit chip with signal processing capabilities, such as a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., where the general-purpose processor can be a microprocessor or any conventional processor, etc.

[0074] The memory 702 may be removable, non-removable, or a combination thereof. Exemplary hardware devices include solid-state memory, hard disk drives, optical disk drives, etc. The memory 702 may optionally include one or more storage devices that are physically remote from the processor 701.

[0075] The memory 702 includes a volatile memory or a non-volatile memory, and may also include both volatile and non-volatile memories. The non-volatile memory may be a read-only memory (ROM), and the volatile memory may be a random access memory (RAM). The memory 702 described in the embodiment of the present application is intended to include any suitable type of memory.

[0076] In some embodiments, the memory 702 can store data to support various operations. Examples of these data include programs, modules, and data structures, or subsets or supersets thereof. In the embodiment of the present application, the memory 702 stores an operating system 7021 and a control device 7022 based on an uninterruptible power supply; specifically,

[0077] Operating system 7021, including system programs for processing various basic system services and performing hardware-related tasks, such as a framework layer, a core library layer, a driver layer, etc., for implementing various basic services and processing hardware-based tasks;

[0078] In some embodiments, the control device based on the uninterruptible power supply provided in the embodiments of the present application can be implemented in a software manner. Figure 7 The control device 7022 based on the uninterruptible power supply stored in the memory 702 is shown, which can be software in the form of programs and plug-ins, etc., including the following software modules: control module 70221, these modules are logical, so they can be arbitrarily combined or further split according to the functions implemented. The functions of each module will be explained below.

[0079] In other embodiments, the control device based on the uninterruptible power supply provided in the embodiments of the present application can be implemented in hardware. As an example, the control device based on the uninterruptible power supply provided in the embodiments of the present application can be a processor in the form of a hardware decoding processor, which is programmed to execute the control method based on the uninterruptible power supply provided in the embodiments of the present application. For example, the processor in the form of a hardware decoding processor can adopt one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field programmable gate arrays (FPGAs) or other electronic components.

[0080] The control method of the uninterruptible power supply provided in the embodiment of the present application will be described below in combination with the exemplary application and implementation of the controller provided in the embodiment of the present application.

[0081] See also Figure 8 , Figure 8 is an optional flow chart of the control method of the uninterruptible power supply provided in the embodiment of the present application, which will be combined with Figure 8 The steps shown are explained.

[0082] Step 801, controlling a second contact unit included in the uninterruptible power supply to close at a first time;

[0083] Step 802, controlling the first contact unit included in the uninterruptible power supply to close at a second time, so as to buffer the transformer unit and the power factor correction unit included in the uninterruptible power supply, so as to suppress the impact current when connecting to the mains;

[0084] Among them, the first time is earlier than the second time; the second contact unit and the first contact unit can both be connected to the mains via the first switch unit; the first contact unit is connected to the transformer unit; the transformer unit is used to isolate the power factor correction unit from the mains; the second contact unit is connected to the transformer unit via a second buffer resistor, and is connected to the first node of the power factor correction unit via a first buffer resistor; when the uninterruptible power supply works normally, the first node is connected to a positive voltage.

[0085] In actual implementation, the controller controls the second contact unit of the uninterruptible power supply to close at a first time and controls the first contactor to close at a second time. Here, the first time is earlier than the second time, so that the voltage of the transformer unit and the power factor correction unit can be buffered by the first buffer power supply and the second buffer unit, and then the mains power can be supplied to the power load through the first contact unit, the transformer unit and the power factor correction unit.

[0086] In some embodiments, the method further includes: after the second time, delaying for a first time period to control the second contact unit to open; after opening, delaying for a second time period to control the power factor correction unit to operate.

[0087] In actual implementation, after the second time, the first time length is delayed to control the second contact unit to open, and after the second contact unit opens, the second time length is delayed to control the operation of the power factor correction unit. Since the contact unit control signal has a delayed execution logic inside the program, the delay effect of the contact unit is eliminated by delaying the opening and controlling the operation of the power factor correction unit. Here, the internal delay time length of the contact unit is 100ms, so the first time length and the second time length can both be set to 100ms.

[0088] In some embodiments, the method further includes: in response to the uninterruptible power supply being powered on for the first time or the AC power being abnormally restored, the time interval between the second time and the first time is a first time interval; in response to the uninterruptible power supply being powered on immediately after being shut down, the time interval between the second time and the first time is a second time interval; wherein, the second time interval is less than or equal to the first time interval.

[0089] Here, the first time interval can provide buffer time for the first buffer unit and the second buffer unit, and can also offset the delay time of the contact unit. The second time interval can also provide buffer time for the first buffer unit and the second buffer unit, and can also offset the delay time of the contact unit. In one embodiment, in response to the uninterruptible power supply being turned on immediately after being turned off, it is immediately determined that the buffering is completed, then the second time interval is only used to offset the delay time of the contact unit, which can be the same length as the delay time of the contact unit, for example, 100ms.

[0090] In some embodiments, the first time duration corresponding to the uninterruptible power supply when it is powered on for the first time or when the mains power is abnormally restored is greater than or equal to the first time duration corresponding to the uninterruptible power supply when it is powered on immediately after being powered off.

[0091] Here, the first time length corresponding to the first startup of the uninterruptible power supply or abnormal recovery of the mains power supply may be 0.2s or 0.5-1s. The first time length corresponding to the startup of the uninterruptible power supply immediately after shutdown may be 100ms.

[0092] In an actual scenario, when the power is turned on for the first time, the AC power buffers the power factor correction unit through the second contact unit, the rectifier unit and the first buffer unit, and buffers the transformer unit through the second contact unit and the second buffer unit. After the buffering is completed, the first contact unit is closed, and the second contact unit is opened 0.2s / 0.5~1s after the first contact unit is closed. The power factor correction unit starts to operate after a 200ms opening delay.

[0093] When the machine is turned on immediately after shutdown, the busbar stores a certain voltage, and the buffering is immediately judged to be completed at the moment of startup. At this time, the second contact unit and the first contact unit obtain the drive start signal almost at the same time; but the control signal of the first contact unit has a 100ms delay execution logic inside the program. Therefore, most of the time, the second contact unit closes first, and then the first contact unit closes after about 100ms, and then the second contact unit opens after another 100ms.

[0094] When the AC power is restored, the second contact unit closes for 0.2s first, and then the first contact unit closes. The first contact unit closes for 0.2s, and then the second contact unit opens. After a 200ms opening delay, the power factor correction unit starts to operate.

[0095] The following is a description of an exemplary structure of the uninterruptible power supply control device 7022 provided in the embodiment of the present application implemented as a software module. In some embodiments, Figure 7 As shown, the software modules stored in the control device 7022 of the uninterruptible power supply in the memory 702 may include:

[0096] The control module 70221 is used to control the second contact unit included in the uninterruptible power supply to close at a first time, and control the first contact unit included in the uninterruptible power supply to close at a second time, so as to buffer the transformer unit included in the uninterruptible power supply and the power factor correction unit included therein, so as to suppress the impact current when connecting to the mains;

[0097] Among them, the first time is earlier than the second time; the second contact unit and the first contact unit can both be connected to the mains via the first switch unit; the first contact unit is connected to the transformer unit; the transformer unit is used to isolate the power factor correction unit from the mains; the second contact unit is connected to the transformer unit via a second buffer resistor, and is connected to the first node of the power factor correction unit via a first buffer resistor; when the uninterruptible power supply works normally, the first node is connected to a positive voltage.

[0098] In some embodiments, the control module 70221 is further used to delay for a first time period after the second time to control the second contact unit to open; after opening, delay for a second time period to control the power factor correction unit to operate.

[0099] In some embodiments, in response to the uninterruptible power supply being turned on for the first time or the AC power being abnormally restored, the time interval between the second time and the first time is a first time interval; in response to the uninterruptible power supply being turned on immediately after being shut down, the time interval between the second time and the first time is a second time interval; wherein, the second time interval is less than or equal to the first time interval.

[0100] In some embodiments, the first time duration corresponding to the uninterruptible power supply when it is powered on for the first time or when the mains power is abnormally restored is greater than or equal to the first time duration corresponding to the uninterruptible power supply when it is powered on immediately after being powered off.

[0101] It should be noted that the description of the device of the embodiment of the present application is similar to the description of the above-mentioned method embodiment, and has similar beneficial effects as the method embodiment, so it will not be repeated.

[0102] The embodiment of the present application provides a computer program product, which includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the control method of the uninterruptible power supply described in the embodiment of the present application.

[0103] An embodiment of the present application provides a computer-readable storage medium storing executable instructions, wherein executable instructions are stored. When the executable instructions are executed by a processor, the processor will execute the control method of the uninterruptible power supply provided by the embodiment of the present application.

[0104] In some embodiments, the computer-readable storage medium may be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, flash memory, magnetic surface storage, optical disk, or CD-ROM; or it may be various devices including one or any combination of the above memories.

[0105] In some embodiments, executable instructions may be in the form of a program, software, software module, script or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as a stand-alone program or as a module, component, subroutine or other unit suitable for use in a computing environment.

[0106] As an example, executable instructions may, but need not, correspond to a file in a file system, may be stored as part of a file that stores other programs or data, such as in one or more scripts in a HyperText Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files storing one or more modules, subroutines, or code portions).

[0107] By way of example, executable instructions may be deployed to be executed on one computing device, or on multiple computing devices located at one site, or on multiple computing devices distributed across multiple sites and interconnected by a communication network.

[0108] In summary, the embodiments of the present application can improve the stability and reliability of the uninterruptible power supply.

[0109] The above is only an embodiment of the present application and is not intended to limit the protection scope of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the present application are included in the protection scope of the present application.

Claims

1. An uninterruptible power supply with surge current suppression, characterized in that: include: A first switch unit, a first contact unit, a second contact unit, a first buffer unit, a second buffer unit, a power factor correction unit, a rectification unit, and a voltage transformation unit, wherein: The first switch unit is connected to the first contact unit and the second contact unit respectively; The first contact unit, the voltage transformation unit, and the power factor correction unit are connected in sequence; The second contact unit, the rectifying unit, and the first buffer unit are connected in sequence and then connected to the first node of the power factor correction unit; One end of the second buffer unit is connected to the connection line between the first contact unit and the voltage transformation unit, and the other end is connected to the connection line between the second contact unit and the rectification unit; In response to the mains being connected via the first switch unit, the second contact unit is controlled to be closed earlier than the first contact unit, so as to suppress the inrush current when the mains is connected.

2. The uninterruptible power supply according to claim 1, characterized in that: The power factor correction unit comprises: an energy storage circuit and a rectifier circuit; wherein; The first end of the energy storage circuit is connected to the voltage transformation unit, and the second end of the energy storage circuit is connected to the rectifier circuit; The rectifier circuit is connected to the first node and the second node, wherein when the uninterruptible power supply works normally, the potential of the first node is greater than the potential of the second node.

3. The uninterruptible power supply according to claim 2, characterized in that: The uninterruptible power supply also includes: an energy storage unit, an inverter unit connected in sequence, a first voltage regulating unit and a second switch unit; wherein the energy storage unit and the rectifier circuit included in the power factor correction unit are connected in parallel between the first node and the second node; one end of the inverter unit is connected to the power factor correction unit, and the other end is connected to the first voltage regulating unit, and the second switch unit is connected to the power load.

4. The uninterruptible power supply according to claim 3, characterized in that: The uninterruptible power supply further comprises: a third switch unit and a fourth switch unit, wherein; One end of the third switch unit is connected to the third node, and the other end is connected to the fourth node via the second voltage regulating unit; the third node can be connected to the mains; the fourth node is located at the connection line between the first voltage regulating unit and the second switch unit; One end of the fourth switch unit is connected to the third node, and the other end is connected between the second switch unit and the power load.

5. The uninterruptible power supply according to any one of claims 1 to 4, characterized in that: The uninterruptible power supply is a three-phase uninterruptible power supply, wherein the transformer unit is a three-phase isolation transformer.

6. A method for controlling an uninterruptible power supply, characterized in that: include: Controlling the second contact unit included in the uninterruptible power supply to close at a first time, and controlling the first contact unit included in the uninterruptible power supply to close at a second time, so as to buffer the transformer unit and the power factor correction unit included in the uninterruptible power supply, so as to suppress the impact current when connecting to the mains; Among them, the first time is earlier than the second time; the second contact unit and the first contact unit can both be connected to the mains via the first switch unit; the first contact unit is connected to the transformer unit; the transformer unit is used to isolate the power factor correction unit from the mains; the second contact unit is connected to the transformer unit via a second buffer resistor, and is connected to the first node of the power factor correction unit via a first buffer resistor; when the uninterruptible power supply works normally, the first node is connected to a positive voltage.

7. The method according to claim 6, characterized in that The method further comprises: After the second time, delaying for a first time period to control the second contact unit to open; After opening the switch, a second time period is delayed to control the power factor correction unit to operate.

8. The method according to claim 7, characterized in that The method further comprises: In response to the uninterruptible power supply being turned on for the first time or the mains power being abnormally restored, the time interval between the second time and the first time is a first time interval; In response to the uninterruptible power supply being turned on immediately after being turned off, the time interval between the second time and the first time is a second time interval; wherein the second time interval is less than or equal to the first time interval.

9. The method according to claim 7, characterized in that: The first time duration corresponding to when the uninterruptible power supply is turned on for the first time or when the mains power is abnormally restored is greater than or equal to the first time duration corresponding to when the uninterruptible power supply is turned on immediately after being turned off.

10. A control device for an uninterruptible power supply, characterized in that: include: A control module, used to control the second contact unit included in the uninterruptible power supply to close at a first time, and control the first contact unit included in the uninterruptible power supply to close at a second time, so as to buffer the transformer unit included in the uninterruptible power supply and the power factor correction unit included therein, so as to suppress the impact current when connecting to the mains; Among them, the first time is earlier than the second time; the second contact unit and the first contact unit can both be connected to the mains via the first switch unit; the first contact unit is connected to the transformer unit; the transformer unit is used to isolate the power factor correction unit from the mains; the second contact unit is connected to the transformer unit via a second buffer resistor, and is connected to the first node of the power factor correction unit via a first buffer resistor; when the uninterruptible power supply works normally, the first node is connected to a positive voltage.

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