Relay control method, terminal, UPS and computer readable storage medium

Abstract

The present invention is applicable to the field of relay technology, and provides a relay control method, a terminal, a UPS, and a computer-readable storage medium, wherein the relay control method is used to control an AC relay at a mains input terminal of a UPS; the relay control method comprises: obtaining a mains voltage; if the mains voltage is greater than a preset overvoltage threshold, controlling a battery boost circuit to operate, and outputting a second voltage to a busbar through a battery power supply circuit; wherein the mains power supply circuit outputs a first voltage to the busbar; after a first preset time, controlling the AC relay to disconnect. The present invention can increase the service life of a UPS.

Description

Technical Field

[0001] The present invention belongs to the technical field of relays, and in particular relates to a relay control method, a terminal, a UPS and a computer-readable storage medium. Background Art

[0002] UPS (Uninterruptible Power Supply) systems are widely used in aerospace, industry, communications, hospitals, network servers, emergency lighting systems, etc. An AC relay is usually set at the mains input of the UPS. When the mains power is abnormal, the AC relay is turned off and the battery power is started at the same time to ensure uninterrupted power supply to the load.

[0003] Most of the existing UPS will directly turn off the AC relay at the AC power input end when a AC power abnormality is detected. However, when the AC power abnormality is AC power overvoltage, the current passing through the AC relay is relatively large. If the AC relay is directly turned off, the AC relay may stick, which will affect the service life of the UPS. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a relay control method, a terminal, a UPS and a computer-readable storage medium to solve the problem in the prior art that when the AC power abnormality is AC power overvoltage, the current passing through the AC relay is large. If the AC relay is directly turned off, the AC relay may stick, thereby affecting the service life of the UPS.

[0005] A first aspect of an embodiment of the present invention provides a relay control method for controlling an AC relay at a mains input terminal of a UPS, wherein the UPS includes a mains rectifier circuit, a battery boost circuit, a bus and an inverter, wherein the AC relay, the mains rectifier circuit, the bus and the inverter are sequentially connected to form a mains power supply circuit, and the battery boost circuit, the bus and the inverter are sequentially connected to form a battery power supply circuit, wherein the mains rectifier circuit includes a diode branch; the relay control method includes:

[0006] Get the mains voltage;

[0007] If the mains voltage is greater than the preset overvoltage threshold, the battery boost circuit is controlled to work, and a second voltage is output to the bus through the battery power supply circuit; wherein the mains power supply circuit outputs a first voltage to the bus;

[0008] After a first preset time, the AC relay is controlled to be disconnected.

[0009] A second aspect of an embodiment of the present invention provides a relay control device for controlling an AC relay at a mains input end of a UPS; the UPS comprises a mains rectifier circuit, a battery boost circuit, a bus and an inverter, the AC relay, the mains rectifier circuit, the bus and the inverter are sequentially connected to form a mains power supply circuit, the battery boost circuit, the bus and the inverter are sequentially connected to form a battery power supply circuit, wherein the mains rectifier circuit comprises a diode branch; the relay control device comprises a voltage acquisition module, a battery control module and a relay control module;

[0010] A voltage acquisition module, used to obtain the mains voltage;

[0011] A battery control module, used to control the battery boost circuit to work if the mains voltage is greater than a preset overvoltage threshold, and output a second voltage to the bus through the battery power supply circuit; wherein the mains power supply circuit outputs a first voltage to the bus;

[0012] The relay control module is used to control the AC relay to disconnect after a first preset time.

[0013] A third aspect of an embodiment of the present invention provides a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the relay control method of the first aspect above when executing the computer program.

[0014] A fourth aspect of the embodiments of the present invention provides a UPS, the UPS comprising an AC relay, a mains rectifier circuit, a battery boost circuit, an inverter and the terminal according to the second aspect above;

[0015] An AC relay, a first end of which is used to receive the mains power, a second end of which is connected to the input end of the mains power rectifier circuit, and the AC relay is controlled by the terminal;

[0016] The inverter has an input end connected to the output end of the mains rectifier circuit and the output end of the battery boost circuit respectively, and an output end used to connect to a load;

[0017] The battery boost circuit has an input terminal for connecting to a battery.

[0018] A fifth aspect of an embodiment of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the relay control method of the first aspect are implemented.

[0019] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0020] The present invention obtains the mains voltage; if the mains voltage is greater than a preset overvoltage threshold, controls the battery boost circuit to work, and outputs a second voltage to the busbar through the battery power supply circuit; wherein the mains power supply circuit outputs a first voltage to the busbar; after a first preset time, controls the AC relay to disconnect. The present invention can prevent the AC relay at the mains input end of the UPS from being disconnected by a large current when the mains is overvoltage, causing adhesion, thereby affecting the reliability of the UPS, and further improving the service life of the UPS. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 is a structural diagram of a UPS provided by an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of the implementation flow of the relay control method provided by the embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of a UPS circuit of a mains rectifier circuit including a switch tube drive circuit and a diode rectifier circuit provided by the present invention;

[0025] Figure 4 is a schematic diagram of a relay control device provided by an embodiment of the present invention;

[0026] Figure 5 is a schematic diagram of a terminal provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0028] In order to illustrate the technical solution of the present invention, specific embodiments are provided below for illustration.

[0029] See also Figure 1 , which shows a schematic diagram of the structure of a UPS provided by an embodiment of the present invention, such as Figure 1As shown, a UPS may include an AC relay 11 , a mains rectifier circuit 12 , an inverter 13 , and a battery boost circuit 15 .

[0030] Generally, there are two lines for UPS to supply power to load 14:

[0031] Mains power supply circuit: mains - AC relay 11 - mains rectifier circuit 12 - busbar - inverter 13 - load 14;

[0032] Battery power supply circuit: battery - battery boost circuit 15 - bus - inverter 13 - load 14.

[0033] In general, the load 14 is powered by the AC power supply circuit. When the AC power is abnormal, the load 14 is powered by the battery power supply circuit to ensure that the UPS continuously supplies power to the load 14.

[0034] See also Figure 2 , which shows a schematic diagram of the implementation flow of the relay control method provided by an embodiment of the present invention, such as Figure 2 As shown, a relay control method is used to control an AC relay at a mains input terminal of a UPS, wherein the UPS includes a mains rectifier circuit, a battery boost circuit, a busbar, and an inverter, wherein the AC relay, the mains rectifier circuit, the busbar, and the inverter are sequentially connected to form a mains power supply circuit, and the battery boost circuit, the busbar, and the inverter are sequentially connected to form a battery power supply circuit, wherein the mains rectifier circuit includes a diode branch; the relay control method may include:

[0035] S101, obtaining the mains voltage.

[0036] Optionally, the mains voltage of the mains power supply end of the UPS may be obtained in real time.

[0037] S102, if the mains voltage is greater than a preset overvoltage threshold, the battery boost circuit is controlled to operate, and a second voltage is output to the bus through the battery power supply circuit; wherein the mains power supply circuit outputs a first voltage to the bus.

[0038] Optionally, under normal circumstances, the mains outputs a first voltage to the busbar through the rectifier circuit. When the mains is over-voltage, since the diode branch is uncontrollable, the mains will still supply power to the busbar through the mains rectifier circuit, and the current flowing through the AC relay will be very large. After the control battery boost circuit starts working, the battery outputs a second voltage to the busbar through the battery boost circuit.

[0039] S103, after a first preset time, control the AC relay to disconnect.

[0040] Optionally, after the UPS battery starts to supply power, the second voltage gradually increases. After the first preset time, the second voltage will be greater than the first voltage. At this time, the first voltage of the AC power supply circuit is higher than the normal bus voltage, but lower than the second voltage. When the second voltage replaces the first voltage to supply power to the bus, the first voltage no longer supplies power to the bus, the current of the AC power supply circuit will decrease, and the current flowing through the AC relay will decrease. In actual applications, when the second voltage is greater than the first voltage, the current flowing through the AC relay is already very small. At this time, the AC relay can be disengaged without adhesion. The first preset time can be determined according to actual conditions.

[0041] The present invention obtains the mains voltage; if the mains voltage is greater than a preset overvoltage threshold, controls the battery boost circuit to work, and outputs a second voltage to the busbar through the battery power supply circuit; wherein the mains power supply circuit outputs a first voltage to the busbar; after a first preset time, controls the AC relay to disconnect. The present invention can prevent the AC relay at the mains input end of the UPS from being disconnected by a large current when the mains is overvoltage, causing adhesion, thereby affecting the reliability of the UPS, and further improving the service life of the UPS.

[0042] In some embodiments of the present invention, within the first preset time, the relay control method further includes:

[0043] Obtain the current of the mains power supply circuit;

[0044] If the second voltage is greater than the first voltage, or the current is not greater than the preset current threshold, the AC relay is controlled to be disconnected.

[0045] Optionally, when only the AC power supply circuit supplies power to the load, the bus voltage is the output voltage of the AC rectifier circuit; when only the battery power supply circuit supplies power to the load, the bus voltage is the output voltage of the battery boost circuit.

[0046] Optionally, when the AC power is overvoltage, the battery power supply circuit is started first to supply power to the load. At this time, the circuit with higher output voltage in the AC power rectifier circuit and the battery boost circuit supplies power to the bus, and the bus voltage is jointly determined by the output voltage of the AC power rectifier circuit and the output voltage of the battery boost circuit.

[0047] If the output voltage of the mains rectifier circuit is not less than the output voltage of the battery boost circuit, the bus voltage is the output voltage of the mains rectifier circuit;

[0048] If the output voltage of the AC rectifier circuit is greater than the output voltage of the battery boost circuit, the bus voltage is the output voltage of the battery boost circuit.

[0049] When the output voltage of the control battery boost circuit is greater than the output voltage of the mains rectifier circuit, the bus voltage is greater than the output voltage of the mains rectifier circuit, and the mains current flowing through the AC relay will gradually decrease. When the mains current is lower than the preset current threshold, the AC relay is controlled to disconnect, realizing the low current disconnection of the AC relay. The preset current threshold can be set according to actual conditions.

[0050] For example, if the mains overvoltage is 265Vac, and the output voltage of the mains rectifier circuit is 375Vdc, the output voltage of the battery boost circuit can be controlled to be 380Vdc. At this time, the bus voltage is 380Vdc, which is greater than 375Vdc. The mains current flowing through the AC relay will decrease rapidly. When the mains current decreases to below the current threshold, the AC relay is controlled to disconnect.

[0051] In some embodiments of the present invention, the mains rectifier circuit further includes a controllable switch tube branch, and the switch tube branch is used to boost the mains input voltage to a preset bus normal working voltage; the relay control method further includes:

[0052] Before controlling the battery rectifier circuit to work, including:

[0053] The switch tube branch is controlled not to work so that the first voltage output by the phase bus of the mains power supply circuit is lower than the preset bus normal working voltage.

[0054] Optionally, the switch tube branch serves as a controllable branch. When the AC power is over-voltage, the switch tube branch can be controlled to not work, so that the first voltage output by the phase bus of the AC power supply circuit is lower than the preset bus normal operating voltage.

[0055] For example, in most cases, the bus voltage of the UPS is 380V, and the diode branch can generally only boost 220Vac to 312Vdc. At this time, the switch tube branch is also needed to boost the voltage and boost 220Vac to 380Vdc. When the mains is overvoltage, the switch tube branch can be controlled not to work first. At this time, the second voltage of the battery boost circuit does not need to be boosted to 380Vdc, but only needs to be higher than the voltage of the uncontrolled rectification (mains through the diode branch). Furthermore, the second voltage of the battery boost circuit can be controlled to be boosted to within the bus operating voltage range. The bus voltage will not cause large fluctuations, and the AC relay can also be disengaged at a small current. The embodiment of the present invention can effectively reduce the boost amplitude of the battery boost circuit and shorten the disengagement time of the AC relay.

[0056] In some embodiments of the present invention, the second voltage is not greater than a preset bus voltage threshold; the preset bus voltage threshold is a maximum withstand voltage value of a bus capacitor of the UPS.

[0057] Optionally, a bus capacitor is provided on the bus for energy storage and filtering. The bus capacitor has a maximum withstand voltage. If the voltage applied across the bus capacitor exceeds the maximum withstand voltage of the bus capacitor, the bus capacitor will be broken down and damaged. Therefore, the second voltage of the battery boost circuit is not greater than a preset bus voltage threshold, and the preset bus voltage threshold is the maximum withstand voltage of the bus capacitor.

[0058] Exemplarily, the maximum withstand voltage of the bus capacitor is 450V, and the second voltage of the power supply boost circuit is not greater than 450V.

[0059] In some embodiments of the present invention, after controlling the AC relay to disconnect, the relay control method further includes:

[0060] Control the output voltage of the battery boost circuit of the UPS to the preset bus normal operating voltage.

[0061] Optionally, the preset bus normal operating voltage can be set according to actual needs.

[0062] For example, when the AC power supply is normally 220Vac, the bus voltage of the AC rectifier circuit is 312Vdc. When the AC power is overvoltage 265Vac, in order to ensure that the relay is disconnected at a small current, the second voltage of the battery boost circuit is controlled to be 380Vdc, that is, the bus voltage is 380Vdc at this time. After the relay is disconnected, the bus voltage is reduced to 312Vdc.

[0063] In some embodiments of the present invention, after controlling the AC relay to disconnect, the relay control method further includes:

[0064] If the mains voltage is not less than the preset normal voltage lower limit and not greater than the preset overvoltage threshold, the AC relay of the UPS is controlled to close and the battery power supply circuit of the UPS is controlled to stop working.

[0065] Optionally, after the mains overvoltage fault is eliminated, the battery power supply circuit is switched to the mains power supply circuit, and the mains power supply circuit supplies power to the load.

[0066] See also Figure 3 , which shows a UPS circuit schematic diagram of a mains rectifier circuit including a switch tube drive circuit and a diode rectifier circuit provided by the present invention, such as Figure 3 As shown, the AC relay 11 is at the mains input end, and the mains rectifier circuit 20 includes a switch tube drive circuit 201 and a diode rectifier circuit 202 .

[0067] The present invention can realize the small current or no current disconnection of the AC relay at the mains power input end of the UPS, can avoid the adhesion of the AC relay, can improve the reliability of the UPS, and increase the service life of the UPS.

[0068] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0069] Corresponding to the above relay control method, the embodiment of the present invention further provides a relay control device, which has the same beneficial effects as the relay control method. Figure 4 , shows a schematic diagram of a relay control device provided by an embodiment of the present invention, such as Figure 4 As shown, in some embodiments of the present invention, the relay control device 30 is used to control the AC relay at the mains input end of the UPS, the UPS includes a mains rectifier circuit, a battery boost circuit, a bus and an inverter, the AC relay, the mains rectifier circuit, the bus and the inverter are connected in sequence to form a mains power supply circuit, the battery boost circuit, the bus and the inverter are connected in sequence to form a battery power supply circuit, wherein the mains rectifier circuit includes a diode branch; the relay control device includes a first voltage acquisition module, a battery control module and a relay control module;

[0070] A voltage acquisition module 301 is used to obtain the mains voltage;

[0071] The battery control module 302 is used to control the battery boost circuit to work if the mains voltage is greater than a preset overvoltage threshold, and output a second voltage to the bus through the battery power supply circuit; wherein the mains power supply circuit outputs a first voltage to the bus;

[0072] The relay control module 303 is used to control the AC relay to disconnect after a first preset time.

[0073] In some embodiments of the present invention, the relay control device 30 may further include a current acquisition module and a relay disconnection module; within the first preset time,

[0074] A current acquisition module, used to acquire the current of the mains power supply circuit;

[0075] The relay disconnecting module is used to control the AC relay to disconnect if the second voltage is greater than the first voltage, or the current is not greater than a preset current threshold.

[0076] In some embodiments of the present invention, the mains rectifier circuit further includes a controllable switch tube branch, and the switch tube branch is used to boost the mains input voltage to a preset bus normal working voltage; the relay control device 30 may further include a first control module;

[0077] The first control module is used to control the switch tube branch to not work before controlling the battery rectifier circuit to work, so that the first voltage output by the phase bus of the mains power supply circuit is lower than the preset bus normal working voltage.

[0078] In some embodiments of the present invention, the second voltage is not greater than a preset bus voltage threshold; the preset bus voltage threshold is a maximum withstand voltage value of a bus capacitor of the UPS.

[0079] In some embodiments of the present invention, the relay control device 30 may further include a second control module;

[0080] The second control module is used to control the second voltage to a preset bus normal operating voltage after the AC relay is controlled to be disconnected.

[0081] In some embodiments of the present invention, the relay control device 30 may further include a third control module;

[0082] The third control module is used to control the AC relay of the UPS to close and control the battery power supply circuit of the UPS to stop working if the AC power voltage is not less than the preset normal voltage lower limit and not greater than the preset overvoltage threshold after the AC relay is controlled to disconnect.

[0083] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the terminal is divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned device can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0084] Figure 5 FIG. 1 is a schematic block diagram of a terminal provided by an embodiment of the present invention. Figure 5 As shown, the terminal 40 of this embodiment includes: one or more processors 401, a memory 402, and a computer program 403 stored in the memory 402 and executable on the processor 401. When the processor 401 executes the computer program 403, the steps in the above relay control method embodiment are implemented, for example Figure 2 Alternatively, when the processor 401 executes the computer program 403, the functions of each module / unit in the above relay control method embodiment are realized, for example Figure 4 Functions of modules 301 to 304 are shown.

[0085] Exemplarily, the computer program 403 may be divided into one or more modules / units, one or more modules / units are stored in the memory 402, and are executed by the processor 401 to complete the present application. One or more modules / units may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program 403 in the terminal 40. For example, the computer program 403 may be divided into a voltage acquisition module 301, a battery control module 302, and a relay control module 304.

[0086] A voltage acquisition module 301 is used to obtain the mains voltage;

[0087] The battery control module 302 is used to control the battery boost circuit to work if the mains voltage is greater than a preset overvoltage threshold, and output a second voltage to the bus through the battery power supply circuit; wherein the mains power supply circuit outputs a first voltage to the bus;

[0088] The relay control module 303 is used to control the AC relay to disconnect after a first preset time.

[0089] Other modules or units can refer to Figure 4 The description in the illustrated embodiment will not be repeated here.

[0090] The terminal 40 includes but is not limited to a processor 401 and a memory 402. Those skilled in the art will appreciate that Figure 5 It is only an example of a terminal and does not constitute a limitation on the terminal 40. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the terminal 40 may also include an input device, an output device, a network access device, a bus, etc.

[0091] The processor 401 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0092] The memory 402 may be an internal storage unit of the terminal, such as a hard disk or memory of the terminal. The memory 402 may also be an external storage device of the terminal, such as a plug-in hard disk equipped on the terminal, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. Further, the memory 402 may also include both an internal storage unit of the terminal and an external storage device. The memory 402 is used to store the computer program 403 and other programs and data required by the terminal. The memory 402 may also be used to temporarily store data that has been output or is to be output.

[0093] An embodiment of the present invention further provides a UPS, the UPS comprising an AC relay, a mains rectifier circuit, a battery boost circuit, an inverter and the above terminal;

[0094] An AC relay, a first end of which is used to receive the mains power, a second end of which is connected to the input end of the mains power rectifier circuit, and the AC relay is controlled by the terminal;

[0095] The inverter has an input end connected to the output end of the mains rectifier circuit and the output end of the battery boost circuit respectively, and an output end used to connect to a load;

[0096] The battery boost circuit has an input terminal for connecting to a battery.

[0097] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0098] Those of ordinary skill in the art will appreciate that the units and algorithm 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 this application.

[0099] In the embodiments provided in the present application, it should be understood that the disclosed terminals and methods can be implemented in other ways. For example, the terminal embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0100] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0101] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0102] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electric carrier signals and telecommunication signals.

[0103] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A relay control method, characterized in that: An AC relay for controlling a mains input terminal of a UPS, wherein the UPS comprises a mains rectifier circuit, a battery boost circuit, a busbar and an inverter, wherein the AC relay, the mains rectifier circuit, the busbar and the inverter are sequentially connected to form a mains power supply circuit, and the battery boost circuit, the busbar and the inverter are sequentially connected to form a battery power supply circuit, wherein the mains rectifier circuit comprises a diode branch; and the relay control method comprises: Get the mains voltage; If the mains voltage is greater than a preset overvoltage threshold, the battery boost circuit is controlled to operate, and a second voltage is output to the bus through the battery power supply circuit; wherein the mains power supply circuit outputs a first voltage to the bus; After a first preset time, controlling the AC relay to disconnect; During the first preset time, the relay control method further includes: Obtaining the current of the mains power supply circuit; If the second voltage is greater than the first voltage, or the current is not greater than a preset current threshold, controlling the AC relay to disconnect; The mains rectifier circuit further includes a controllable switch tube branch, and the switch tube branch is used to boost the mains input voltage to a preset bus normal working voltage; the relay control method further includes: Before controlling the battery boost circuit to work, the method includes: The switch tube branch is controlled not to work, so that the first voltage output by the mains power supply circuit to the bus is lower than the preset bus normal operating voltage.

2. The relay control method according to claim 1, characterized in that: The second voltage is not greater than a preset bus voltage threshold; the preset bus voltage threshold is a maximum withstand voltage value of the bus capacitor of the UPS.

3. The relay control method according to claim 1 or 2, characterized in that: After controlling the AC relay to be disconnected, the relay control method further includes: Control the second voltage to a preset bus normal operating voltage.

4. The relay control method according to claim 1 or 2, characterized in that: After controlling the AC relay to be disconnected, the relay control method further includes: If the mains voltage is not less than the preset normal voltage lower limit and not greater than the preset overvoltage threshold, the AC relay of the UPS is controlled to close, and the battery power supply circuit of the UPS is controlled to stop working.

5. A relay control device, characterized in that: An AC relay for controlling the mains input terminal of a UPS; the UPS comprises a mains rectifier circuit, a battery boost circuit, a busbar and an inverter; the AC relay, the mains rectifier circuit, the busbar and the inverter are sequentially connected to form a mains power supply circuit; the battery boost circuit, the busbar and the inverter are sequentially connected to form a battery power supply circuit, wherein the mains rectifier circuit comprises a diode branch; the relay control device comprises a voltage acquisition module, a battery control module and a relay control module; The voltage acquisition module is used to acquire the mains voltage; The battery control module is used to control the battery boost circuit to work if the mains voltage is greater than a preset overvoltage threshold, and output a second voltage to the bus through the battery power supply circuit; wherein the mains power supply circuit outputs a first voltage to the bus; The relay control module is used to control the AC relay to disconnect after a first preset time; The relay control device also includes a current acquisition module and a relay disconnection module; within a first preset time, The current acquisition module is used to acquire the current of the mains power supply circuit; The relay disconnection module is used to control the AC relay to disconnect if the second voltage is greater than the first voltage, or the current is not greater than a preset current threshold; The mains rectifier circuit also includes a controllable switch tube branch, and the switch tube branch is used to boost the mains input voltage to a preset bus normal working voltage; the relay control device also includes a first control module; The first control module is used to control the switch tube branch to not work before controlling the battery boost circuit to work, so that the first voltage output by the mains power supply circuit to the bus is lower than the preset normal working voltage of the bus.

6. A terminal comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the relay control method according to any one of claims 1 to 4 are implemented.

7. A UPS, characterized in that: The UPS comprises an AC relay, a mains rectifier circuit, a battery boost circuit, an inverter and a terminal as claimed in claim 6; The AC relay has a first end for receiving the mains power and a second end connected to the input end of the mains power rectifier circuit, and the AC relay is controlled by the terminal; The inverter has an input end connected to the output end of the mains rectifier circuit and the output end of the battery boost circuit respectively, and an output end connected to a load; The input end of the battery boost circuit is used to be connected to the battery.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the relay control method according to any one of claims 1 to 4 are implemented.

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