Dual-input DC power supply switching device

Abstract

The invention provides a dual-input direct-current power supply switching device. The device comprises a first input end, a first power supply circuit, a second input end and a second power supply circuit, the first input end provides electric energy provided by an accessed first direct current power supply end to an electrical load end through a first power supply circuit; the second power supply circuit comprises an isolating switch power supply circuit, and the second input end transforms the electric energy output by the accessed second direct current power supply end through the isolating switch power supply circuit and then provides the electric energy to the first power supply circuit; wherein the output voltage of the isolating switch power supply circuit is lower than the working voltage of the first power supply circuit; therefore, seamless switching of two paths of power supply is realized.

Description

Technical Field

[0001] This application relates to the technical field of power supply equipment, and particularly to a dual-input DC power supply switching device. Background Art

[0002] In the current power supply for critical loads in data centers, the power supply method shown in Figure 1 is generally adopted. There are two DC (direct current) inputs, namely Route A and Route B. When one input fails, it is automatically switched to the other route through the ATS (automatic transfer switch) connected behind it, ensuring continuous power supply at the back. The ATS is generally a mechanical switch (such as a contactor, air switch, etc.), and the power supply will pause for dozens of milliseconds during the switching. This power supply system has the following problems: 1. An ATS is required, and there will be a power supply termination of dozens of milliseconds during the switch switching, and subsequent critical loads such as IT loads have the risk of downtime. 2. When the ATS switches, the input voltage of the critical load drops significantly or even to zero. When the switching is completed, there will be an instantaneous input overcharge current, which may even cause the air switch on the line to trip. 3. The ATS is generally a mechanical device such as a switch or a contactor, and the number of switching times is limited. Moreover, when switching under DC, it is easy to generate arcs and damage the ATS switch, etc. Summary of the Invention

[0003] The purpose of this application is to provide a dual-input DC power supply switching device, which can at least partially solve the problems existing in the prior art.

[0004] To achieve the above purpose, a dual-input DC power supply switching device provided by this application specifically includes a first input terminal, a first power supply circuit, a second input terminal, and a second power supply circuit; the first input terminal provides the electric energy provided by the connected first DC power supply terminal to the power consumption load terminal through the first power supply circuit; the second power supply circuit includes an isolation switch power supply circuit, and the second input terminal transforms the electric energy output by the connected second DC power supply terminal through the isolation switch power supply circuit and provides it to the first power supply circuit; wherein, the output voltage of the isolation switch power supply circuit is lower than the working voltage of the first power supply circuit.

[0005] In an embodiment of this application, optionally, the second power supply circuit further includes a filtering circuit, and the filtering circuit is connected in parallel with the switch power supply circuit to the first power supply circuit.

[0006] In an embodiment of this application, optionally, the filtering circuit is a capacitor.

[0007] In an embodiment of this application, optionally, the isolation switch power supply circuit includes one or more parallel DC / DC converters.

[0008] In an embodiment of the present application, optionally, the voltage conversion circuit of the DC / DC converter includes one or a combination of a full-bridge conversion circuit, a half-bridge conversion circuit, and a resonant conversion circuit.

[0009] In an embodiment of the present application, optionally, the rectification circuit of the DC / DC converter includes a diode rectification circuit and / or a metal-oxide-semiconductor field-effect transistor rectification circuit.

[0010] In an embodiment of the present application, optionally, the first power supply circuit includes a unidirectional conduction circuit, and the unidirectional conduction circuit is connected in series between the access node where the second power supply circuit accesses the first power supply circuit and the first input terminal.

[0011] In an embodiment of the present application, optionally, the first power supply circuit includes a control switch, and the control switch is connected in series between the access node where the second power supply circuit accesses the first power supply circuit and the first input terminal.

[0012] In an embodiment of the present application, optionally, the first power supply circuit includes a non-isolated switch power supply circuit, and the non-isolated switch power supply circuit is connected in series between the access node where the second power supply circuit accesses the first power supply circuit and the first input terminal.

[0013] In an embodiment of the present application, optionally, the non-isolated switch power supply circuit includes a boost chopper or a buck chopper.

[0014] The beneficial technical effects of the present application are as follows: seamless switching can be achieved during the conversion between the two power supplies (the output is not interrupted). When converting between the two power supplies, the input current of the IT load will not have a sudden change, avoiding the tripping of air switches on the line due to instantaneous large currents; there is no mechanical switch action during the entire power-off recovery process, only the isolated switch power supply circuit of the B path operates, with a long service life and no arcing. Electrical isolation is provided between the two inputs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only

[0016] some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0017] Figure 1 is a schematic circuit diagram for supplying power to key loads in a data center in the prior art;

[0018] Figure 2ASchematic diagram of the logic structure of a dual-input DC power supply switching device provided by an embodiment of the present application;

[0019] Figure 2B Internal structure schematic diagram of a dual-input DC power supply switching device provided by an embodiment of the present application;

[0020] Figure 3 Position schematic diagram of a one-way conduction circuit provided by an embodiment of the present application;

[0021] Figure 4 Position schematic diagram of a control switch provided by an embodiment of the present application;

[0022] Figure 5 Position schematic diagram of a non-isolated switch power supply circuit provided by an embodiment of the present application. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0024] Hereinafter, terms such as "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features.

[0025] In addition, in the present application, orientation terms such as "upper", "lower", "left", and "right" are defined relative to the orientation of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, and they are used for relative description and clarification, and they may change accordingly with the change of the orientation of the components placed in the accompanying drawings.

[0026] In the present application, unless otherwise clearly defined and limited, "connection" should be understood in a broad sense. For example, "connection" may be a direct connection or an indirect connection through an intermediate medium.

[0027] To solve the problems such as the downtime of the electrical equipment on the load side caused by power failure during the main and standby power supply switching in the existing dual-power supply technology; the present application provides a dual-input DC power supply switching device applicable to an uninterruptible power system (UPS). Please refer to Figure 2AAs shown in the figure, it specifically includes a first input terminal, a first power supply circuit, a second input terminal, and a second power supply circuit; the first input terminal provides the electrical energy provided by the connected first DC power supply terminal to the electrical load terminal through the first power supply circuit; the second power supply circuit includes an isolation switch power supply circuit, and the second input terminal transforms the electrical energy output by the connected second DC power supply terminal through the isolation switch power supply circuit and provides it to the first power supply circuit; wherein, the output voltage of the isolation switch power supply circuit is lower than the operating voltage of the first power supply circuit.

[0028] An uninterruptible power supply system is a component used to supply power to loads that require continuous power supply, such as computers. In the above embodiments provided in this application, during normal operation, the first power supply circuit is directly connected, and the first DC power supply terminal provides power to the electrical load terminal; at this time, although the second power supply circuit is connected to the first power supply circuit, its voltage is lower than the operating voltage of the first power supply circuit (for example, the output voltage of the isolation switch power supply circuit is 2V to 3V lower than the operating voltage of the first power supply circuit), so it is in a standby state; when the first power supply circuit loses power, such as a power failure fault of the first DC power supply terminal, at this time, the second power supply circuit directly takes over the first DC power supply terminal to provide electrical energy to the electrical load terminal.

[0029] In this way, the entire switching process can better ensure that the critical load is continuously powered, and there is no mechanical switch action, effectively avoiding the switching times limitation of mechanical devices such as switches or contactors in the prior art. The above electrical load terminal can be electrical equipment in a factory or communication equipment such as servers, processors, and memories in a data center. This application does not make further limitations here.

[0030] In an embodiment of this application, the second power supply circuit may further include a filtering circuit, and the filtering circuit is connected in parallel with the switch power supply circuit to the first power supply circuit; wherein, the filtering circuit can be a capacitor. Through this filtering circuit, filtering operation in the circuit is realized, and the AC components mixed in the DC circuit are filtered out to avoid unnecessary interference to relevant components in the subsequent electrical load terminal.

[0031] Specifically, in actual operation, the power supply method of the data center has two DC inputs, namely the first DC power supply terminal A and the second DC power supply terminal B, and the switching is performed through a DC STS (static switch), that is, the dual-input DC power supply switching device provided in this application. The internal structure of the DC STS is as Figure 2B shown; Route A provides electrical energy directly to the IT load through the first power supply circuit, and Route B provides electrical energy through the second power supply circuit, and after being transformed and adjusted by the isolation switch power supply circuit to a voltage lower than that of Route A, it is connected to Route A.

[0032] During normal operation, path A is directly connected to supply power to the critical load, and path B outputs a DC voltage (the voltage across capacitor C) through the isolating switch power circuit. This voltage is slightly lower than the voltage of path A (e.g., 2 - 3V). In this way, during normal operation, the IT load is powered by path A, and path B is in a backup state.

[0033] When a power failure occurs in path A, path B directly takes over from path A to supply power to the IT load after passing through the isolating switch power circuit. The switching process can ensure that the critical load does not lose power and there is no mechanical switch action, avoiding the problems in the prior art.

[0034] When path A returns to normal, since the voltage of path A is slightly higher than the voltage transformed by path B through the isolating switch power circuit, the IT load naturally switches to be powered by path A. During the entire power failure recovery process, there is no mechanical switch action, and only the isolating switch power circuit of path B operates.

[0035] In an embodiment of the present application, the isolating switch power circuit includes one or more parallel DC / DC converters. Among them, the voltage transformation circuit of the DC / DC converter includes a combination of one or more of a full - bridge transformation circuit, a half - bridge transformation circuit, and a resonant transformation circuit; the rectification circuit of the DC / DC converter includes a diode rectification circuit and / or a MOSFET rectification circuit.

[0036] Specifically, in actual operation, the present application can, based on the characteristics of the DC / DC converter, output the standby direct current to the DC / DC converter, and then the DC / DC converter supplies it to the first power supply circuit. During this process, the DC / DC converter can operate in a hot standby state. Since its output voltage is lower than that of the first power supply circuit, a natural transition of the dual - input can be directly completed; at the same time, the DC / DC converter can also operate in a cold standby state. When a voltage drop in the output is detected, the DC / DC converter can also output immediately (within 1 to 2 ms), thus completing the transition of the dual - input. Because the interruption time is short, the impact on the downstream load is limited.

[0037] During this process, to improve the stability of the isolating switch power circuit, multiple parallel DC / DC converters can be selected. In this way, when any one of the DC / DC converters fails or has problems, the DC / DC converters in other parallel lines can also provide a stable power output to ensure the natural transition of the dual - input. During its application process, the structure of the DC / DC converter can be selected based on actual needs, such as a full - bridge transformation circuit, a half - bridge transformation circuit, or a resonant transformation circuit for the voltage transformation circuit. Similarly, for the rectification circuit, a diode rectification circuit or a MOSFET rectification circuit can also be selected. Those skilled in the art can select and set according to actual needs, and the present application does not make further limitations in this regard.

[0038] In actual work, due to the main-standby switching function of the dual-input DC power supply switching device, when a fault occurs in the main circuit, the standby circuit will provide corresponding power supply for switching. During this process, in addition to the target electrical load, the main circuit may also include other associated branches, and the way the standby circuit is connected to the main circuit stores the risk of reverse power flow of the relevant loads on these branches; based on this problem, the present application can further set relevant anti-reverse power flow designs on the first power supply circuit to solve it. In an embodiment of the present application, the first power supply circuit may include a unidirectional conduction circuit, and the unidirectional conduction circuit is connected in series between the access node where the second power supply circuit accesses the first power supply circuit and the first input terminal. Similarly, a control switch can also be used, and the control switch is connected in series between the access node where the second power supply circuit accesses the first power supply circuit and the first input terminal.

[0039] Specifically, reference can be made to Figure 3 As shown, a unidirectional conduction circuit is connected in series on the A-path power supply line, such as components like diode D1 (diode) or silicon controlled rectifier (SCR), etc., to realize a unidirectional conduction channel from the first DC power supply terminal to the IT load at the power consumption load end on the A path. Other electric energy accessing the first power supply circuit cannot pass through the unidirectional conduction circuit, thus avoiding the problem of reverse power flow; among them, the specific components used for the unidirectional conduction circuit can be selected and set according to actual needs, and the present application does not make further limitations on this.

[0040] Please refer to again Figure 4 As shown, similar to the Figure 3 unidirectional conduction circuit, a control switch can also be connected in series on the A-path power supply line to prevent reverse power flow. When a fault occurs in the A path and the B path accesses the A path to complete the switching power supply, the control switch can be disconnected, realizing that the second power supply circuit and other loads except the IT load at the non-power consumption load end in the first power supply circuit become an open circuit and will not be reverse-powered by the B-path current.

[0041] In summary, to prevent the reverse power flow of the B-path current during the fault of the A path, relevant technical personnel can choose to use a unidirectional conduction circuit or a control switch for protection according to actual needs. Its installation position needs to be limited between the access point where the B path accesses the A path and the first input terminal. Which specific branch to protect against reverse power flow can be determined according to actual needs, so the installation position is not further limited here.

[0042] In an embodiment of the present application, optionally, the first power supply circuit includes a non-isolated switch power supply circuit, and the non-isolated switch power supply circuit is connected in series between the access node where the second power supply circuit accesses the first power supply circuit and the first input terminal. Among them, the non-isolated switch power supply circuit includes a boost chopper or a buck chopper.

[0043] Specifically, please refer to Figure 5As shown, in actual work, the boost or buck control of the first power supply circuit can be achieved by adding a non-isolated switching power supply circuit to the first power supply circuit. For example, when the non-isolated switching power supply circuit uses a boost chopper, the first power supply circuit can be boosted based on the boost chopper to make the first power supply circuit higher than the second power supply circuit to ensure the main circuit power supply, or other boost operations can be used to change the output voltage of the first power supply circuit to the electrical load. In another embodiment, the non-isolated switching power supply circuit can also use a buck chopper to change the output voltage of the first power supply circuit to the electrical load, which will not be elaborated one by one here.

[0044] The beneficial technical effects of this application are as follows: seamless switching can be achieved during the conversion between the two power supplies (no interruption in output). When switching between the two power supplies, the input current of the IT load will not have a sudden change, avoiding the tripping of air switches on the line due to instantaneous large current. During the entire power failure recovery process, there is no mechanical switch action, only the isolated switching power supply circuit of the B path acts, with a long service life and no arcing. There is electrical isolation between the two inputs.

[0045] Those skilled in the art should understand that the embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0046] This application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of this application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0047] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implements the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0048] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide for implementing the steps of the function specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 or the steps of the function specified in multiple blocks.

[0049] In the description of this specification, the descriptions referring to terms such as "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present application. It should be understood that the above are only specific embodiments of the present application and are not used to limit the protection scope of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A dual-input DC power supply switching device, characterized in that The dual-input DC power supply switching device includes a first input terminal, a first power supply circuit, a second input terminal, and a second power supply circuit; The first input terminal supplies the electric energy provided by the first DC power supply terminal connected thereto to the power consumption load terminal through the first power supply circuit; The second power supply circuit includes an isolation switch power supply circuit, and the second input terminal supplies the electric energy output from the second DC power supply terminal connected thereto to the first power supply circuit after voltage transformation through the isolation switch power supply circuit; Wherein, the output voltage of the isolation switch power supply circuit is lower than the operating voltage of the first power supply circuit.

2. The dual-input DC power supply switching device according to claim 1, wherein The second power supply circuit further includes a filtering circuit, and the filtering circuit is connected in parallel with the switch power supply circuit to the first power supply circuit.

3. The dual-input DC power supply switching device according to claim 2, wherein, The filtering circuit is a capacitor.

4. The dual-input DC power supply switching device according to claim 1, characterized in that The isolation switch power supply circuit includes one or more parallel-connected DC / DC converters.

5. The dual-input DC power supply switching device according to claim 4, characterized in that, The voltage transformation circuit of the DC / DC converter includes a combination of one or more of a full-bridge transformation circuit, a half-bridge transformation circuit, and a resonant transformation circuit.

6. The dual-input DC power supply switching device according to claim 4, characterized in that, The rectification circuit of the DC / DC converter includes a diode rectification circuit and / or a metal-oxide-semiconductor field-effect transistor rectification circuit.

7. The dual-input DC power supply switching device according to claim 1, wherein The first power supply circuit includes a unidirectional conduction circuit, and the unidirectional conduction circuit is connected in series between the access node where the second power supply circuit accesses the first power supply circuit and the first input terminal.

8. The dual-input DC power supply switching device according to claim 1, wherein The first power supply circuit includes a control switch, and the control switch is connected in series between the access node where the second power supply circuit accesses the first power supply circuit and the first input terminal.

9. The dual-input DC power supply switching device according to claim 1, wherein The first power supply circuit includes a non-isolation switch power supply circuit, and the non-isolation switch power supply circuit is connected in series between the access node where the second power supply circuit accesses the first power supply circuit and the first input terminal.

10. The dual-input DC power supply switching device according to claim 9, characterized in that, The non-isolation switch power supply circuit includes a boost chopper or a buck chopper.

Images