Power supply unit and ring power supply system

Abstract

The application provides a power supply unit, comprising a first high-frequency isolation converter comprising a first end connected to a first voltage, and a second end and a third end; and a second high-frequency isolation converter comprising a first end connected to a second voltage, and a second end and a third end; wherein the second end of the second high-frequency isolation converter and the second end of the first high-frequency isolation converter are connected in parallel to a first end of a first load, and the third end of the second high-frequency isolation converter and the third end of the first high-frequency isolation converter are connected in parallel to a second end of the first load. The application also provides a loop power supply system having the above power supply unit.

Description

Technical Field

[0001] This invention relates to redundant power supply systems, and more specifically, to power supply units and loop power supply systems having power supply units. Background Technology

[0002] According to research data from the China Data Center Energy Conservation Technology Committee, the total power consumption of data centers in China exceeded 120 billion kilowatt-hours in 2016. With the increasing number of services supported by data centers, their computing load and scale will continue to grow rapidly. The safe, reliable, and uninterrupted operation of data centers relies on a highly reliable power supply system. Therefore, various redundant power supply solutions have been proposed.

[0003] like Figure 1 As shown, Figure 1 A conventional 2N redundant power supply system 100 is illustrated. In this system, two 10kV AC inputs are used. The AC inputs are stepped down by power frequency transformers 101 and 102, and then further converted into DC outputs by converters 111 and 121. These DC outputs are then connected to the dual inputs 121 and 121 of the load 120 to supply power, achieving 2N redundancy. An AC bus tie switch S connects the two power supplies, shielding the load from the impact of faults above the AC bus section. However, when a fault occurs at or below this bus section, the load may face a situation where only one side of the power supply is available.

[0004] As the reliability requirements of IDC (information data center) continue to increase, the situation of one side of the load being powered for a long time is gradually becoming unacceptable.

[0005] Existing technologies have proposed a power supply method that uses phase-shifting transformers to replace traditional power frequency transformers. Figure 2 A power supply system 200 using a phase-shifting transformer is shown. For example... Figure 2As shown, the power supply system 200 has two phase-shifting transformers 201 and 202. The output of each phase-shifting transformer is divided into two groups, each group connected to an AC-DC converter (A2D). For example, the output of phase-shifting transformer 201 is divided into two groups, connected to converters 211 and 212 respectively, and the output of phase-shifting transformer 202 is divided into two groups, connected to converters 213 and 214 respectively. The two converters connected to phase-shifting transformer 201 and the two converters connected to phase-shifting transformer 202 are cross-interconnected. The two cross-interconnected DC outputs serve as dual outputs for the load, forming a 2N redundancy system. That is, converters 211 and 213 are connected to the input terminal 221 of load 220, and converters 212 and 214 are connected to the input terminal 222 of load 220. Therefore, by cross-interconnecting the output buses, the impact of faults above the DC bus section on the load can be shielded. Furthermore, when one power supply fails, the dual input power supply to the load can be guaranteed, thus avoiding the situation of single-sided power supply to the load.

[0006] Although, for example Figure 2 The power supply system 200 shown can avoid the situation where the load is powered on only one side for a long time. However, due to the heavy weight, large size and many windings of the phase-shifting transformer itself, the existing power supply system has the following shortcomings: (1) there are many windings between the phase-shifting transformer and A2D, and many connections; (2) when the phase-shifting transformer fails, it is difficult to maintain it directly on site and it takes a long time; (3) the power supply system of the phase-shifting transformer + A2D architecture is large in size and heavy in weight.

[0007] Therefore, a redundant power supply system with a simple structure, few connections, and easy maintenance is needed. Summary of the Invention

[0008] The purpose of this invention is to provide a redundant power supply system that is simple in structure, has few connections, and is easy to maintain.

[0009] According to one aspect of the present invention, a power supply unit is provided, comprising: a first high-frequency isolation converter including a first terminal connected to a first voltage, and a second terminal and a third terminal; and a second high-frequency isolation converter including a first terminal connected to a second voltage, and a second terminal and a third terminal; wherein the second terminal of the second high-frequency isolation converter and the second terminal of the first high-frequency isolation converter are connected in parallel to the first terminal of a first load, and the third terminal of the second high-frequency isolation converter and the third terminal of the first high-frequency isolation converter are connected in parallel to the second terminal of the first load.

[0010] Optionally, in the above power supply unit, the second terminal of the first high-frequency isolation converter is connected in parallel with the second terminal of the second high-frequency isolation converter via the first connection unit, and the third terminal of the first high-frequency isolation converter is connected in parallel with the third terminal of the second high-frequency isolation converter via the second connection unit.

[0011] Optionally, in the above power supply unit, the connection unit is a wire, fuse, switch or converter.

[0012] Optionally, the power supply unit further includes a first energy storage element and a second energy storage element, wherein the first energy storage element is electrically connected to the first end of the first load via a connection unit, and the second energy storage element is electrically connected to the second end of the first load via another connection unit.

[0013] Optionally, in the above power supply unit, the first high-frequency isolation converter and the second high-frequency isolation converter each include: a plurality of modules, each of the plurality of modules including: a rectifier circuit including a first terminal and a second terminal; a first high-frequency isolation circuit, the first terminal of the first high-frequency isolation circuit being connected to the second terminal of the rectifier circuit, and the second terminal of the first high-frequency isolation circuit being connected to the first terminal of the first load; and a second high-frequency isolation circuit, the first terminal of the second high-frequency isolation circuit and the first terminal of the first high-frequency isolation circuit being connected in parallel, and the second terminal of the second high-frequency isolation circuit being connected to the second terminal of the first load, wherein the first terminals of the rectifier circuits of the plurality of modules are connected in series.

[0014] Optionally, in the above power supply unit, the rectifier circuit is a full-bridge rectifier circuit or a half-bridge rectifier circuit.

[0015] Optionally, in the power supply unit described above, in each of the plurality of modules: the first high-frequency isolation circuit and the second high-frequency isolation circuit share an insulating board, the first high-frequency isolation circuit includes a first transformer, the second high-frequency isolation circuit includes a second transformer, the first transformer and the second transformer each include a magnetic core, a primary winding and a secondary winding, a portion of the magnetic core and the primary winding of the first transformer and the second transformer are disposed on a first side of the insulating board, and another portion of the magnetic core and the secondary winding of the first transformer and the second transformer are disposed on a second side of the insulating board opposite to the first side.

[0016] Optionally, in the above power supply unit, the first high-frequency isolation converter and the second high-frequency isolation converter each include multiple modules, each of the multiple modules including: a first rectifier circuit, including a first terminal and a second terminal; an inverter circuit, the first terminal of the inverter circuit being connected to the second terminal of the first rectifier circuit; a transformer, including a primary winding and two secondary windings, the primary winding being connected to the second terminal of the inverter circuit; and two second rectifier circuits, respectively connected to the two secondary windings and respectively connected to the first terminal and the second terminal of the first load; wherein, the first terminals of the first rectifier circuits of the multiple modules are connected in series.

[0017] Optionally, in the above power supply unit, the first voltage and the second voltage are 10kV AC voltage.

[0018] Optionally, in the above power supply unit, the first high-frequency isolation converter and the second high-frequency isolation converter are each configured such that energy can flow bidirectionally between the second terminal and the third terminal of the respective high-frequency isolation converter.

[0019] Optionally, the power supply unit further includes a first energy storage element, which is electrically connected to the first terminal of the first load, the second terminal of the first high-frequency isolation converter, and the second terminal of the second high-frequency isolation converter, wherein the first high-frequency isolation converter and the second high-frequency isolation converter are configured such that:

[0020] Energy from the first energy storage element is transferred from the second terminal of the first high-frequency isolation converter to the second terminal of the first load via the third terminal of the first high-frequency isolation converter; or

[0021] Energy from the first energy storage element is transferred from the second terminal of the second high-frequency isolation converter to the second terminal of the first load via the third terminal of the second high-frequency isolation converter.

[0022] Optionally, the power supply unit further includes a second energy storage element, which is electrically connected to the second terminal of the first load, the third terminal of the first high-frequency isolation converter, and the third terminal of the second high-frequency isolation converter, wherein the first high-frequency isolation converter and the second high-frequency isolation converter are configured such that:

[0023] Energy from the second energy storage element is transferred from the third terminal of the first high-frequency isolation converter to the first terminal of the first load via the second terminal of the first high-frequency isolation converter; or

[0024] Energy from the second energy storage element is transferred from the third terminal of the second high-frequency isolation converter to the first terminal of the first load via the second terminal of the second high-frequency isolation converter.

[0025] Optionally, the power supply unit further includes: a third high-frequency isolation converter, comprising a first terminal connected to a third voltage, a second terminal and a third terminal, wherein the second terminal of the first high-frequency isolation converter is connected in parallel to the first terminal of the second load via a third connection unit, and the third terminal of the first high-frequency isolation converter is connected in parallel to the second terminal of the second load via a fourth connection unit.

[0026] According to another aspect of the present invention, a power supply system is provided, comprising: N power supply units, N≥2, wherein each of the N power supply units is a power supply unit according to any embodiment of the present invention; and the N power supply units include a first power supply unit and a second power supply unit, wherein the third terminal of the second high-frequency isolation converter of the first power supply unit is connected to the second terminal of the first high-frequency isolation converter of the second power supply unit via a connection unit.

[0027] Optionally, in the above power supply system, the second terminal of the first high-frequency isolation converter of the i-th power supply unit in the N power supply units is connected in parallel with the third terminal of the first high-frequency isolation converter of the (i-1)-th power supply unit in the N power supply units via a connection unit, and the third terminal of the first high-frequency isolation converter of the i-th power supply unit in the N power supply units is connected in parallel with the second terminal of the first high-frequency isolation converter of the (i+1)-th power supply unit in the N power supply units via a connection unit, where 2≤i≤N-1; and the second terminal of the first high-frequency isolation converter of the 1-th power supply unit in the N power supply units is connected in parallel with the third terminal of the first high-frequency isolation converter of the N-th power supply unit in the N power supply units via a connection unit.

[0028] Optionally, in the above power supply system, the N power supply units include M power supply units, where M < N; the second terminal of the first high-frequency isolation converter of the i-th power supply unit among the M power supply units is connected in parallel via a connection unit to the third terminal of the first high-frequency isolation converter of the (i-1)-th power supply unit among the M power supply units, and the third terminal of the first high-frequency isolation converter of the i-th power supply unit among the M power supply units is connected in parallel via a connection unit to the second terminal of the first high-frequency isolation converter of the (i+1)-th power supply unit among the M power supply units, where 2 ≤ i ≤ M-1; and the second terminal of the first high-frequency isolation converter of the first power supply unit among the M power supply units is connected in parallel via a connection unit to the third terminal of the first high-frequency isolation converter of the M-th power supply unit among the M power supply units.

[0029] Optionally, in the above power supply system, it further includes one or more additional power supply units independent of the N power supply units, and the one or more additional power supply units are power supply units according to any embodiment of the present invention.

[0030] Optionally, in the above power supply system, the first terminals of the first high-frequency isolation converters of the N power supply units are connected in parallel, and the first terminals of the second high-frequency isolation converters of the N power supply units are connected in parallel.

[0031] According to another aspect of the present invention, there is provided a power supply system, including: a plurality of power supply units according to any embodiment of the present invention, where the first terminals of the first high-frequency isolation converters of the plurality of power supply units are connected in parallel, and the first terminals of the second high-frequency isolation converters of the plurality of power supply units are connected in parallel.

[0032] The power supply unit proposed by the present invention achieves a simpler and more compact structure by using a high-frequency isolation converter, thereby reducing the floor area. In addition, the high-frequency isolation converter allows for a modular design, so it can allow a faulty high-frequency isolation converter to disconnect the medium-voltage input, enabling cold plug-in and fast maintenance, thus comprehensively improving the output efficiency per unit area of the computer room. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Therefore, in order to be able to understand in detail the above-described features of the present invention, a more specific description of the content outlined above can be obtained by referring to the embodiments. The drawings relate to the embodiments of the present invention and are described as follows:

[0034] Figure 1 Shows a power supply system of the prior art.

[0035] Figure 2 Shows a power supply system of the prior art.

[0036] Figure 3AA schematic diagram of a power supply unit according to one embodiment of the present invention is shown.

[0037] Figures 3B-3E A schematic diagram of the energy flow of the energy storage element of a power supply unit according to an embodiment of the present invention is shown.

[0038] Figure 4 A schematic diagram of the high-frequency isolation converter shown in Figure 3 is presented.

[0039] Figure 5 Shown Figure 4 The transformer configuration of the two high-frequency isolation circuits in the high-frequency isolation converter.

[0040] Figure 6 A schematic diagram of the high-frequency isolation converter shown in Figure 3 is presented.

[0041] Figure 7 A schematic diagram of a power supply unit according to another embodiment of the present invention is shown.

[0042] Figure 8 A schematic diagram of a loop power supply system according to an embodiment of the present invention is shown. Detailed Implementation

[0043] Various embodiments of the invention will be described in detail, one or more examples of which are illustrated in the accompanying drawings. In the following description of the drawings, the same reference numerals denote the same parts. Hereinafter, only differences with respect to the various embodiments are described. The various examples are provided by way of explanation of the invention and are not intended to limit the invention. Furthermore, features shown or described as part of one embodiment may be used on or in combination with other embodiments to produce another embodiment. This specification is intended to include such modifications and variations.

[0044] Figure 3A A schematic diagram of a power supply unit 300 according to one embodiment of the present invention is shown. Figure 3A As shown, the power supply unit 300 includes two sets of high-frequency isolation transformers, such as SST (solid state transformer), namely the first SST 301 and the second SST 302. These two sets of SST 301 and 302 are used to supply power to the load 320.

[0045] The first SST 301 has a first terminal 311, a second terminal 312, and a third terminal 313. The first terminal 311 of the first SST 301 receives a medium-voltage AC input (e.g., 10kV AC voltage) and converts it to a low-voltage DC output (e.g., 270V DC voltage) via an AC-DC converter. The second terminal 312 and the third terminal 313 provide the converted low-voltage DC output to the first terminal 321 and the second terminal 322 of the load 320, respectively. Therefore, the first SST 301 converts a single medium-voltage AC input into two low-voltage DC outputs, one from the second terminal 312 and the other from the third terminal 313. Similarly, the second SST 302 has a first terminal 314, a second terminal 315, and a third terminal 316. The first terminal 314 of the second SST 302 receives a medium-voltage AC input (e.g., 10kV AC voltage) and converts it to a low-voltage DC output (e.g., 270V DC voltage) via an AC-DC converter. The second terminal 315 and the third terminal 316 provide the converted low-voltage DC output to the first terminal 321 and the second terminal 322 of the load 320, respectively. Therefore, the single medium-voltage AC input of the second SST 302 is converted into two low-voltage DC outputs from the second terminal 315 and the third terminal 316, respectively.

[0046] Although Figure 3A The first SST 301 and the second SST 302 shown receive the same medium-voltage AC input (e.g., both 10kV AC voltage). Alternatively, the medium-voltage AC input received by the first SST 301 may be different from that received by the second SST 302. For example, the first SST 301 may receive a 10kV medium-voltage AC input, while the second SST 302 may receive a 20kV medium-voltage AC input. When the first SST 301 and the second SST 302 receive different medium-voltage AC inputs, the conversion circuits in the first SST 301 and the second SST 302 can be set with different parameters (e.g., different transformation ratios) so that the first SST 301 and the second SST 302 still output the same DC output (e.g., 270V DC voltage).

[0047] like Figure 3AAs shown, the first SST 301 and the second SST 302 are cross-connected on the output side, so that the two DC outputs after the cross-connection of the output sides of the first SST 301 and the second SST 302 supply power to the load 320 through the first terminal 321 and the second terminal 322, respectively. Specifically, the second terminal 312 of the first SST 301 and the second terminal 315 of the second SST 302 are both connected to the first node N1, and then connected to the first terminal 321 of the load 320 to supply power to it; the third terminal 313 of the first SST 301 and the third terminal 316 of the second SST 302 are both connected to the second node N2, and then connected to the second terminal 322 of the load 320 to supply power to it. Therefore, the power supply unit 300 achieves 2N redundant power supply to the load 320 by using two SSTs. That is, in the power supply unit 300, even if one of the first SST 301 and the second SST 302 fails, the dual power supply to the load 320 can still be guaranteed. For example, when the first SST 301 fails, the load 320 can still be powered by the two DC outputs from the second SST 302 because the first SST 301 and the second SST 302 are cross-connected on the output side. Or when the second SST 302 fails, the load 320 can still be powered by the two DC outputs from the first SST 301 because the first SST 301 and the second SST 302 are cross-connected on the output side.

[0048] As discussed above, the SST in the power supply unit 300, upon receiving a medium-voltage AC input, can convert the medium-voltage AC power into a low-voltage DC power output. (In conjunction with the above...) Figure 2 Compared to the power supply system 200 that first uses a phase-shifting transformer for voltage transformation and then an AC-DC converter for conversion, the SST of power supply unit 300 eliminates the need for at least hundreds of low-voltage cables required to connect the phase-shifting transformer and the AC-DC converter. Therefore, power supply unit 300 achieves a simpler and more compact structure by using SST, resulting in a floor space reduction of at least 50%. Furthermore, SST allows for modular design, enabling rapid maintenance in case of failure, thereby increasing the overall output efficiency per unit area of ​​the computer room by at least 10%.

[0049] In some embodiments that can be combined with the above embodiments, the power supply unit 300 may further be provided with energy storage elements 331 and 332 (e.g., batteries) so that when both the first SST 301 and the second SST 302 fail, or when the medium-voltage AC input connected to the first terminal 311 of the first SST 301 and the first terminal 314 of the second SST 302 fails, the energy storage elements 331 and 332 can temporarily supply power to the load 320. Energy storage element 331 is connected to the second terminal 312 of the first SST 301, the second terminal 315 of the second SST 302, and the first terminal 321 of the load 320 via a connection unit (shown as a switch in the figure) to provide electrical energy to the first terminal 321 of the load 320. Energy storage element 332 is connected to the third terminal 313 of the first SST 301, the third terminal 316 of the second SST 302, and the second terminal 322 of the load 320 via another connection unit (shown as another switch in the figure) to provide electrical energy to the second terminal 322 of the load 320.

[0050] In some embodiments that can be combined with the above-described embodiments, the second end 312 of the first SST 301 and the second end 315 of the second SST 302 are connected to the first node N1 via a connection unit (not shown), and the third end 313 of the first SST 301 and the third end 316 of the second SST 302 are connected to the second node N2 via a connection unit (not shown). This connection unit can be a wire, fuse, switch, or converter.

[0051] For example, if the connection unit is a fuse, when the first SST 301 and the second SST 302 fail (e.g., short circuit) and output excessive current through the output terminal, the fuse will blow to prevent damage to the load 320 due to the excessive current output caused by the failure of the first SST 301 and the second SST 302. As discussed above, even if the first SST 301 and the second SST 302 stop supplying power to the load 320 due to the fuse blowing, the load 320 can still be dual-powered by the two DC outputs of the normally operating SSTs because the first SST 301 and the second SST 302 are cross-connected on the output side.

[0052] For example, when the connection unit is a controllable switch, this controllable switch can be used in conjunction with the sensors and controllers provided in the first SST 301 and the second SST 302. When the sensor detects a fault in either the first SST 301 or the second SST 302, the controller can control the switch associated with the faulty SST to disconnect, thereby preventing the faulty SST from further damaging the load 320. As discussed above, even if one of the first SST 301 and the second SST 302 stops supplying power to the load 320 due to the switch being disconnected, the load 320 can still be dual-powered by the two DC outputs of the normally operating SST, since the first SST 301 and the second SST 302 are cross-connected on the output side.

[0053] Although the above describes different connection units, these different connection units can also be used in combination.

[0054] In some embodiments that can be combined with the above-described embodiments, the first SST 301 and the second SST 302 are each configured such that energy can flow bidirectionally between the second and third terminals of the respective SSTs. It has been described above that energy storage elements 331 and 332 are provided to temporarily power the load 320 when a failure occurs in the medium-voltage AC input connected to the first terminal 311 of the first SST 301 and the first terminal 314 of the second SST 302. With either energy storage element 331 or 332 present, for example, when a failure occurs in the electrical connection between energy storage element 331 and the first terminal 321 of the load 320, energy can still be transferred from energy storage element 331 to the second terminal 312 of the first SST 301, then to the third terminal 313 of the first SST 301, and finally to the second terminal 322 of the load 320 (e.g., ...). Figure 3B (As shown). Alternatively, energy can still be transferred from the energy storage element 331 to the second terminal 315 of the second SST 302, and then to the third terminal 316 of the second SST 302, and finally to the second terminal 322 of the load 320 (as shown). Figure 3C (As shown). Thus, the electrical energy of the energy storage element 331 can be provided to the second terminal 322 of the load 320 via the bidirectional energy flow between the second and third terminals of the first SST 301 and the second SST 302. Similarly, when the electrical connection between the energy storage element 332 and the second terminal 322 of the load 320 fails, energy can still be transferred from the energy storage element 332 to the third terminal 313 of the first SST 301, then to the second terminal 312 of the first SST 301, and finally to the first terminal 321 of the load 320 (as shown). Figure 3D(As shown). Alternatively, energy can still be transferred from the energy storage element 332 to the third terminal 316 of the second SST 302, and then to the second terminal 315 of the second SST 302, and finally to the first terminal 321 of the load 320 (as shown). Figure 3E (As shown). Thus, the electrical energy of the energy storage element 332 can be supplied to the first terminal 321 of the load 320 via the bidirectional energy flow between the second and third terminals of the first SST 301 and the second SST 302. Therefore, even if there is a power outage on both mains lines (i.e., a failure occurs in the medium-voltage AC input connected to the first terminal 311 of the first SST 301 and the first terminal 314 of the second SST 302), and the electrical connection from one energy storage element to the corresponding load port fails, sufficient backup power time can be guaranteed even with the battery configuration on both sides reduced by half.

[0055] The specific structure of SST will be further described below. Figure 4 A schematic diagram of a high-frequency isolation converter (e.g., SST) 400 is shown. Figure 4 SST 400 in Figure 3 can be either the first SST 301 or the second SST 302 in Figure 3.

[0056] like Figure 4 As shown, the SST 400 consists of multiple modules M1, M2, ... Mn with identical construction. Each module has the same structure, therefore the construction of each module will be described with reference to module M1. Module M1 has a rectifier circuit 410 and two high-frequency isolation circuits 420 and 430. The primary sides of the high-frequency isolation circuits 420 and 430 are connected in parallel to the DC output side of the rectifier circuit 410. The rectifier circuit 410 receives an AC input and converts it into a DC voltage output. Then, the high-frequency isolation circuits 420 and 430 convert the DC voltage output from the rectifier circuit 410 into a low-voltage DC output (e.g., a 270V DC output). The high-frequency isolation circuit 420 outputs a first DC output (e.g., a 270V DC output V1), and the high-frequency isolation circuit 430 outputs a second DC output (e.g., a 270V DC output V2).

[0057] In the SST 400, the AC input sides of the rectifier circuits 410 in multiple modules are connected in series to receive the medium-voltage AC output, and the secondary sides of the high-frequency isolation circuits 420 in multiple modules are connected in parallel to serve as the first DC output. Similarly, the secondary sides of the high-frequency isolation circuits 430 in multiple modules are connected in parallel to serve as the second DC output. Therefore, the SST400's minimalist multi-module, two-stage architecture achieves high efficiency in voltage conversion, and the multiple modules simplify maintenance.

[0058] In some embodiments that can be combined with the above-described embodiments, in order to achieve bidirectional energy flow between the second and third terminals of the SST, the high-frequency isolation circuits 420 and 430 of each module of the SST 400 are configured as bidirectional DC / DC converter circuits. One side of the high-frequency isolation circuit 420 and one side of the high-frequency isolation circuit 430 are connected in parallel to the common bus Vbus. The other side of the high-frequency isolation circuit 420 is connected to the first DC output (e.g., a 270V DC output V1) and supplies power to the first terminal of the load. The other side of the high-frequency isolation circuit 430 is connected to the second DC output (e.g., a 270V DC output V2) and supplies power to the second terminal of the load. Figures 3B-3C In the case where the energy storage element supplies power to the second terminal of the load sequentially via the second and third terminals of the SST, the energy from the energy storage element is transferred from the first DC output to the common bus Vbus through the high-frequency isolation circuit 420, which acts as a bidirectional DC / DC converter. Then, the energy is transferred from the common bus Vbus to the second DC output through the high-frequency isolation circuit 430, which also acts as a bidirectional DC / DC converter, and supplies power to the second terminal of the load. This ensures that even if the electrical connection from the energy storage element to the first terminal of the load fails, the energy storage element can still supply power to the second terminal of the load. Figures 3D-3E When the energy of the energy storage element shown is supplied to the first terminal of the load in sequence via the third and second terminals of SST, the high-frequency isolation circuits 420 and 430 also operate in a similar manner.

[0059] In some embodiments that can be combined with the above embodiments, the rectifier circuit 410 may be a full-bridge rectifier circuit or a half-bridge rectifier circuit.

[0060] In some embodiments that can be combined with the above embodiments, the high-frequency isolation circuits 420 and 430 employ LLC to achieve high frequency and high efficiency, and in order to pursue a compact structure for the high-frequency isolation circuits 420 and 430, their transformers can reuse the same insulating board.

[0061] Figure 5 The arrangement of the transformers for the high-frequency isolation circuits 420 and 430 is shown. (As...) Figure 5As shown, the transformers of high-frequency isolation circuits 420 and 430 are mounted on an insulating plate 440. A portion of the core and primary winding 421 of the transformer in high-frequency isolation circuit 420, and a portion of the core and primary winding 431 of the transformer in high-frequency isolation circuit 430, are mounted on the first side 441 of the insulating plate 440. Another portion of the core and secondary winding 422 of the transformer in high-frequency isolation circuit 420, and another portion of the core and secondary winding 432 of the transformer in high-frequency isolation circuit 430, are mounted on the second side 442 of the insulating plate 440, with the first side 441 and the second side 442 facing each other. Therefore, the high-frequency isolation circuits 420 and 430 using a reused insulating plate have a more compact structure and further reduce the floor space required.

[0062] Figure 6 A schematic diagram of a high-frequency isolation converter (e.g., SST) 400' according to another embodiment is shown. Figure 6 SST 400' in Figure 3 can be either the first SST 301 or the second SST 302 in Figure 3.

[0063] like Figure 6 As shown, SST 400' consists of multiple modules M1, M2, ... Mn with identical construction. Each module has the same structure, therefore the construction of each module will be described with reference to module M1. Module M1 has a rectifier circuit 410, an inverter circuit 440, a transformer 450, and two switching circuits 461 and 462. The rectifier circuit 410 receives an AC input and converts it into a DC voltage output. The DC voltage output from the rectifier circuit 410 is then input to the input of the inverter circuit 440, converting the DC voltage back into an AC voltage before outputting it from the inverter circuit's output to the primary winding 451 of the transformer 450. The transformer 450 further has two secondary windings 452 and 453 to transform the AC voltage on the primary winding 451 into two low-voltage AC paths. The secondary winding 452 is connected to the switching circuit 461 for converting the first low-voltage AC path into a first low-voltage DC path (e.g., ...). Figure 6 (270V V1 in the middle). The secondary winding 453 is connected to the switching circuit 462 for converting the second low-voltage AC to a second low-voltage DC (e.g., 270V V1). Figure 6 (270V V2 in the middle).

[0064] In the SST 400', the AC input sides of the rectifier circuits 410 in multiple modules are connected in series to receive medium-voltage AC input, and the output sides of the switching circuits 461 in multiple modules are connected in parallel to serve as the first DC output. The output sides of the switching circuits 462 in multiple modules are also connected in parallel to serve as the second DC output. Therefore, the multi-module, two-level architecture of the SST 400' achieves high efficiency in voltage conversion, and the multiple modules simplify maintenance.

[0065] In some embodiments that can be combined with the above-described embodiments, in order to achieve bidirectional energy flow between the second and third terminals of the SST, energy can flow bidirectionally in the switching circuits 461 and 462 of each module of the SST 400'. The first DC output (e.g., Figure 6 The 270V V1 in the first path supplies power to the first terminal of the load. The second DC output (e.g., Figure 6 The 270V V2 in the circuit supplies power to the second terminal 322 of the load. Combined with... Figures 3B-3C In the case where the energy storage element supplies power to the second terminal of the load sequentially via the second and third terminals of the SST, the energy from the first DC output is transferred to the winding 452 of the transformer 450 through the switching circuit 461. Then, based on the coupling between the transformer windings 452 and 453, the energy is transferred from winding 452 to winding 453, and finally to the second DC output through the switching circuit 462 to supply power to the second terminal of the load. This ensures that even if the electrical connection from the energy storage element to the first terminal of the load fails, the energy storage element can still supply power to the second terminal of the load. Figures 3D-3E When the energy storage element shown supplies power to the first terminal of the load sequentially via the third and second terminals of SST, the switching circuits 462 and 463 operate in a similar manner.

[0066] Figure 7 A schematic diagram of a power supply unit 500 according to another embodiment of the present invention is shown. The power supply unit 500 includes three sets of high-frequency isolation converters, such as SSTs, namely a first SST 501, a second SST 502 and a third SST 503, which are used to supply power to two loads 520 and 530.

[0067] The first SST 501 has a first terminal 511, a second terminal 512, and a third terminal 513. The first terminal 511 of the first SST 501 receives a medium-voltage AC input (e.g., 10kV AC voltage) and, through an AC-DC converter, converts the medium-voltage AC input into a low-voltage DC output (e.g., 270V DC voltage) output from the second terminal 512 and the third terminal 513. Similarly, the second SST 502 has a first terminal 514, a second terminal 515, and a third terminal 516. The first terminal 514 of the second SST 502 receives a medium-voltage AC input (e.g., 10kV AC voltage) and, through an AC-DC converter, converts the medium-voltage AC input into a low-voltage DC output (e.g., 270V DC voltage) output from the second terminal 515 and the third terminal 516. Similarly, the third SST 503 has a first terminal 517, a second terminal 518, and a third terminal 519. The first terminal 517 of the third SST 503 receives a medium-voltage AC input (e.g., 10KV AC voltage) and converts it into a low-voltage DC output (e.g., 270V DC voltage) through an AC-DC converter, which is then output from the second terminal 518 and the third terminal 519.

[0068] Although Figure 7 The SSTs 501-503 shown receive the same medium-voltage AC input (e.g., all 10kV AC voltage). Alternatively, the medium-voltage AC inputs received by the first SST 501, second SST 502, and third SST 503 can be different from each other. In this case, the conversion circuits in the first SST 501, second SST 502, and third SST 503 can be set with different parameters (e.g., different transformation ratios) so that the first SST 501, second SST 502, and third SST 503 still output the same DC output (e.g., 270V DC voltage).

[0069] like Figure 7As shown, the first SST 501, the second SST 502, and the third SST 503 are cross-connected on the output side to form two sets of dual-channel DC outputs. One set supplies power to the first terminal 521 and the second terminal 522 of the load 520, and the other set supplies power to the first terminal 531 and the second terminal 532 of the load 530. Specifically, the second terminal 512 of the first SST 501 and the second terminal 515 of the second SST 502 are both connected to the first node N1, and then connected to the first terminal 521 of the load 520 to supply power to it; the third terminal 513 of the first SST 501 and the third terminal 516 of the second SST 502 are both connected to the second node N2, and then connected to the second terminal 522 of the load 520 to supply power to it. The second terminal 512 of the first SST 501 and the second terminal 518 of the third SST 503 are further connected to the third node N3, and then connected to the first terminal 531 of the load 530 to supply power to it; the third terminal 513 of the first SST 501 and the third terminal 519 of the third SST 503 are further connected to the fourth node N4, and then connected to the second terminal 532 of the load 530 to supply power to it. Therefore, the power supply unit 500 achieves redundant power supply for the two loads 520 and 530 by using three SSTs.

[0070] In power supply unit 500, even if one of the first SST 501, second SST 502, and third SST 503 fails, dual power supply to the two loads 520 and 530 can still be guaranteed. For example, when the first SST 501 fails, because the first SST 501, second SST 502, and third SST 503 are cross-connected on the output side, load 520 can still be powered by the two DC outputs from the second SST 502, and load 530 can still be powered by the two DC outputs from the third SST 503. The same applies when either the second SST 502 or the third SST 503 fails.

[0071] In some embodiments that can be combined with the above embodiments, although not shown, but similar to the power supply unit 300 discussed in FIG3, the power supply unit 500 may also be further provided with an energy storage element to temporarily supply power to the loads 520 and 530 when two or three of the first SST 501, the second SST 502 and the third SST 503 fail.

[0072] In some embodiments that can be combined with the above-described embodiments, similar to the power supply unit 300 discussed in FIG3, such as... Figure 6As shown, the second end 512 of the first SST 501 is connected to the second end 515 of the second SST 502 via connection unit 541; the third end 513 of the first SST 501 is connected to the third end 516 of the second SST 502 via connection unit 543; the second end 512 of the first SST 501 is connected to the second end 518 of the third SST 503 via connection unit 542; and the third end 513 of the first SST 501 is connected to the third end 519 of the third SST 503 via connection unit 544. These connection units can be wires, fuses, switches, or converters, and function the same as the connection units in the power supply unit 300 discussed with reference to FIG. 3, and will not be described again here.

[0073] Figure 8 A schematic diagram of a power supply system 600 according to one embodiment of the present invention is shown. The power supply system includes N power supply units, where N is greater than or equal to 2. For example, Figure 7 The power supply system shown includes four power supply units. The construction of each power supply unit is the same as that of power supply unit 300 discussed in Figure 3 above. For example, power supply unit P1 includes two sets of high-frequency isolation converters, such as SSTs, namely the first SST 601 and the second SST 602, which supply power to the load 620. The first SST 601 has a first terminal 611, a second terminal 612, and a third terminal 613. The first terminal 611 of the first SST 601 receives a medium-voltage AC input (e.g., 10kV AC voltage) and converts it to a low-voltage DC output (e.g., 270V DC voltage) through an AC-DC converter. The second terminal 612 and the third terminal 613 provide the converted low-voltage DC output to the first terminal 621 and the second terminal 622 of the load 620, respectively. Therefore, the first SST 601 converts a single medium-voltage AC input into two low-voltage DC outputs, one from the second terminal 612 and the other from the third terminal 613. Similarly, the second SST 602 has a first terminal 614, a second terminal 615, and a third terminal 616. The first terminal 614 of the second SST 602 receives a medium-voltage AC input (e.g., 10kV AC voltage) and converts it to a low-voltage DC output (e.g., 270V DC voltage) via an AC-DC converter. The second terminal 615 and the third terminal 616 provide the converted low-voltage DC output to the first terminal 621 and the second terminal 622 of the load 620, respectively. Therefore, the first SST 602 converts a single medium-voltage AC input into two low-voltage DC outputs, one from the second terminal 615 and the other from the third terminal 616. Furthermore, the power supply unit P1 may also have the same connection units and energy storage elements as the power supply unit 300 discussed in FIG. 3. Power supply units P2, P3, and P4 have the same construction as power supply unit P1.

[0074] In the power supply system 600, at least two power supply units are connected by a connection unit. For example, for power supply units P1 and P2, the third terminal 616 of the second SST 602 in power supply unit P1 and the second terminal 612 of the first SST 601 in power supply unit P2 are connected in parallel via a connection unit 631; as another example, for power supply units P2 and P3, the third terminal 616 of the second SST 602 in power supply unit P2 and the second terminal 612 of the first SST 601 in power supply unit P3 are connected in parallel via a connection unit 632. As yet another example, for power supply units P3 and P4, the third terminal 616 of the second SST 602 in power supply unit P3 and the second terminal 612 of the first SST 601 in power supply unit P4 are connected in parallel via a connection unit 633.

[0075] In the power supply system 600, additionally or alternatively, at least three power supply units are connected to each other via connection units. For example, for power supply units P1, P2, and P3, the third terminal 616 of the second SST 602 in power supply unit P1 is connected to the second terminal 612 of the first SST 601 in power supply unit P2 via connection unit 631, and the third terminal 616 of the second SST 602 in power supply unit P2 is connected to the second terminal 612 of the first SST 601 in power supply unit P3 via connection unit 632. As another example, for power supply units P2, P3, and P4, the third terminal 616 of the second SST 602 in power supply unit P2 is connected to the second terminal 612 of the first SST 601 in power supply unit P3 via connection unit 632, and the third terminal 616 of the second SST 602 in power supply unit P3 is connected to the second terminal 612 of the first SST 601 in power supply unit P4 via connection unit 633.

[0076] In the power supply system 600, additionally or alternatively, the first power supply unit P1 and the last power supply unit P4 among the N power supply units can be connected by a connecting unit. For example, the third end 616 of the second SST 602 in power supply unit P4 is connected to the second end 612 of the first SST 601 in power supply unit P1 via a connecting unit 634, so that the N power supply units have a substantially ring-shaped connection structure.

[0077] In the power supply system 600, additionally or alternatively, the first terminal 611 of the first SST 601 of each of the N power supply units P1, P2, P3 and P4 may be connected in parallel to receive a medium-voltage AC input, and the first terminal 614 of the second SST 602 of each of the N power supply units P1, P2, P3 and P4 may be connected in parallel to receive another medium-voltage AC input.

[0078] The loop power supply system 600, thus connected in this way, forms a redundant power supply system that supplies power to the load of each power supply unit. As long as there are not three consecutive SST failures, the loop power supply system 600 can guarantee dual-path output for all loads. For example, if both SSTs of power supply unit P2 fail, the third terminal 616 of the second SST 602 of power supply unit P1 can continue to supply power to the first terminal 621 of the load 620 of power supply unit P2, while the second terminal 612 of the first SST 601 of power supply unit P3 can continue to supply power to the second terminal 622 of the load 620 of power supply unit P2. That is, even if both SSTs of a power supply unit fail, the load of the failed power supply unit can be supplied with dual-path power by the SSTs of other power supply units connected to the failed power supply unit.

[0079] In some embodiments that can be combined with the above-described embodiments, the loop power supply system 600 may further include one or more additional power supply units that are independent of (i.e., electrically unconnected to) the N power supply units forming the loop. For example, the power supply system 600 may further include a power supply unit P5 that is independent of the loop-forming power supply units P1, P2, P3, and P4. Figure 8 As shown, the construction of power supply unit P5 can be similar to that of power supply unit 300 discussed in Figure 3. The construction of power supply unit P5 can also be similar to... Figure 7 The power supply unit 500 discussed is similar.

[0080] exist Figure 8 In the power supply system shown, the first SST 301 and the second SST 302 can also be configured such that energy can flow bidirectionally between the second and third terminals of the respective SSTs. If the path from battery 641 in power supply unit P1 to the first terminal 621 of load 620 fails, by allowing energy to flow bidirectionally between the second and third terminals of the same SST, battery 641 can supply power to the load through the second terminal of load 620, and battery 642 in power supply unit P4 can also supply power to the load through the second terminal of load 620. This ensures sufficient backup power time even when both mains power lines fail and the path from one battery to the corresponding load port fails, even with the battery configuration on both sides reduced by half.

[0081] In the above embodiments, the example described is that energy flows from the medium-voltage AC terminal to the DC load terminal. In other embodiments, energy can also flow from the DC load terminal to the medium-voltage AC terminal.

[0082] In summary, the power supply unit proposed in this invention achieves a simpler and more compact structure by using a high-frequency isolation converter, thereby reducing the floor space required. Furthermore, the high-frequency isolation converter allows for modular design, enabling the disconnection of the medium-voltage input from a faulty high-frequency isolation converter, facilitating cold-plugging and quick maintenance, thus comprehensively improving the output efficiency per unit area of ​​the data center. By connecting the power supply units into a ring using a connecting unit, even if both high-frequency isolation converters in one power supply unit fail, the load of the faulty power supply unit can be dual-powered by high-frequency isolation converters in other adjacent power supply units, improving the reliability of the power supply system.

[0083] Although the foregoing describes embodiments of the present invention, other and further embodiments of the present invention may be devised without departing from the basic scope of the present invention, and the scope of the present invention is defined by the appended claims.

Claims

1. A power supply unit, comprising: A first high-frequency isolation converter includes a first terminal, a second terminal, and a third terminal connected to a first voltage; and The second high-frequency isolation converter includes a first terminal connected to a second voltage, as well as a second terminal and a third terminal; wherein The second terminal of the second high-frequency isolation converter and the second terminal of the first high-frequency isolation converter are connected in parallel to the first terminal of the first load to provide a first power supply to the first load. The third terminal of the second high-frequency isolation converter and the third terminal of the first high-frequency isolation converter are connected in parallel to the second terminal of the first load to provide a second power supply to the first load. When both the first and second high-frequency isolation converters are functioning normally, they jointly provide dual-path power to the first load. When one of the first high-frequency isolation converter and the second high-frequency isolation converter fails, the other of the first high-frequency isolation converter and the second high-frequency isolation converter provides dual power supply to the first load.

2. The power supply unit according to claim 1, wherein the second terminal of the first high-frequency isolation converter is connected in parallel with the second terminal of the second high-frequency isolation converter via the first connection unit, and the third terminal of the first high-frequency isolation converter is connected in parallel with the third terminal of the second high-frequency isolation converter via the second connection unit.

3. The power supply unit according to claim 2, wherein the connection unit is a wire, fuse, switch or converter.

4. The power supply unit according to claim 1 further includes a first energy storage element and a second energy storage element, wherein the first energy storage element is electrically connected to the first end of the first load via a connection unit, and the second energy storage element is electrically connected to the second end of the first load via another connection unit.

5. The power supply unit according to claim 1, wherein the first high-frequency isolation converter and the second high-frequency isolation converter each comprise: Multiple modules, each of the multiple modules comprising: A rectifier circuit includes a first terminal and a second terminal; A first high-frequency isolation circuit, wherein a first terminal of the first high-frequency isolation circuit is connected to a second terminal of the rectifier circuit, and a second terminal of the first high-frequency isolation circuit is connected to a first terminal of the first load; and A second high-frequency isolation circuit is provided, wherein the first terminal of the second high-frequency isolation circuit is connected in parallel with the first terminal of the first high-frequency isolation circuit, and the second terminal of the second high-frequency isolation circuit is connected to the second terminal of the first load. in, The first terminals of the rectifier circuits of the plurality of modules are connected in series.

6. The power supply unit according to claim 5, wherein the rectifier circuit is a full-bridge rectifier circuit or a half-bridge rectifier circuit.

7. The power supply unit according to claim 5, wherein, In each of the plurality of modules: The first high-frequency isolation circuit and the second high-frequency isolation circuit share an insulating board. The first high-frequency isolation circuit includes a first transformer, and the second high-frequency isolation circuit includes a second transformer. The first transformer and the second transformer each include a magnetic core, a primary winding, and a secondary winding. Part of the magnetic core and primary winding of the first transformer and the second transformer are disposed on the first side of the insulating plate, and Another portion of the magnetic core and secondary winding of the first transformer and the second transformer are disposed on the second side of the insulating plate opposite to the first side.

8. The power supply unit according to claim 1, wherein the first high-frequency isolation converter and the second high-frequency isolation converter each comprise a plurality of modules, each of the plurality of modules comprising: The first rectifier circuit includes a first terminal and a second terminal; An inverter circuit, wherein a first terminal of the inverter circuit is connected to a second terminal of the first rectifier circuit; A transformer comprising a primary winding and two secondary windings, the primary winding being connected to the second terminal of the inverter circuit; and Two second switching circuits are respectively connected to the two secondary windings, and respectively connected to the first terminal and the second terminal of the first load. in, The first terminals of the first rectifier circuits of the plurality of modules are connected in series.

9. The power supply unit according to claim 1, wherein the first voltage and the second voltage are 10kV AC voltage.

10. The power supply unit according to claim 1, wherein the first high-frequency isolation converter and the second high-frequency isolation converter are each configured such that energy can flow bidirectionally between the second terminal and the third terminal of the respective high-frequency isolation converter.

11. The power supply unit according to claim 10, further comprising a first energy storage element, the first energy storage element being electrically connected to the first terminal of the first load, the second terminal of the first high-frequency isolation converter, and the second terminal of the second high-frequency isolation converter, wherein the first high-frequency isolation converter and the second high-frequency isolation converter are configured such that: Energy from the first energy storage element is transferred from the second terminal of the first high-frequency isolation converter to the second terminal of the first load via the third terminal of the first high-frequency isolation converter; or Energy from the first energy storage element is transferred from the second terminal of the second high-frequency isolation converter to the second terminal of the first load via the third terminal of the second high-frequency isolation converter.

12. The power supply unit of claim 10, further comprising a second energy storage element electrically connected to the second terminal of the first load, the third terminal of the first high-frequency isolation converter, and the third terminal of the second high-frequency isolation converter, wherein the first high-frequency isolation converter and the second high-frequency isolation converter are configured such that: Energy from the second energy storage element is transferred from the third terminal of the first high-frequency isolation converter to the first terminal of the first load via the second terminal of the first high-frequency isolation converter; or Energy from the second energy storage element is transferred from the third terminal of the second high-frequency isolation converter to the first terminal of the first load via the second terminal of the second high-frequency isolation converter.

13. The power supply unit according to claim 2, comprising: The third high-frequency isolation converter includes a first terminal, a second terminal, and a third terminal connected to a third voltage. The second terminal of the first high-frequency isolation converter is connected in parallel to the first terminal of the second load via a third connection unit and the second terminal of the third high-frequency isolation converter. The third terminal of the first high-frequency isolation converter is connected in parallel to the second terminal of the second load via a fourth connection unit and the third terminal of the third high-frequency isolation converter.

14. A power supply system, comprising: There are N power supply units, where N≥2, Each of the N power supply units is a power supply unit according to any one of claims 1-12; and The N power supply units include a first power supply unit and a second power supply unit. The third terminal of the second high-frequency isolation converter of the first power supply unit is connected to the second terminal of the first high-frequency isolation converter of the second power supply unit via a connection unit.

15. The power supply system according to claim 14, wherein The second terminal of the first high-frequency isolation converter of the i-th power supply unit in the N power supply units is connected in parallel with the third terminal of the first high-frequency isolation converter of the (i-1)-th power supply unit in the N power supply units via a connection unit, and the third terminal of the first high-frequency isolation converter of the i-th power supply unit in the N power supply units is connected in parallel with the second terminal of the first high-frequency isolation converter of the (i+1)-th power supply unit in the N power supply units via a connection unit, where 2≤i≤N-1; and The second terminal of the first high-frequency isolation converter of the first power supply unit in the N power supply units is connected in parallel with the third terminal of the first high-frequency isolation converter of the Nth power supply unit via a connection unit.

16. The power supply system according to claim 14, wherein, The N power supply units comprise M power supply units, M <N; The second terminal of the first high-frequency isolation converter of the i-th power supply unit in the M power supply units is connected in parallel with the third terminal of the first high-frequency isolation converter of the (i-1)-th power supply unit in the M power supply units via a connection unit, and the third terminal of the first high-frequency isolation converter of the i-th power supply unit in the M power supply units is connected in parallel with the second terminal of the first high-frequency isolation converter of the (i+1)-th power supply unit in the M power supply units via a connection unit, where 2≤i≤M-1; and The second terminal of the first high-frequency isolation converter of the first power supply unit in the M power supply units is connected in parallel with the third terminal of the first high-frequency isolation converter of the Mth power supply unit via a connection unit.

17. The power supply system according to claim 14 or 15, comprising one or more additional power supply units independent of the N power supply units, wherein the one or more additional power supply units are power supply units according to any one of claims 1-10.

18. The power supply system according to any one of claims 14-16, wherein the first terminals of the first high-frequency isolation converters of the N power supply units are connected in parallel, and the first terminals of the second high-frequency isolation converters of the N power supply units are connected in parallel.

19. A power supply system, comprising: Multiple power supply units according to any one of claims 1-12, wherein, The first terminals of the first high-frequency isolation converters of the multiple power supply units are connected in parallel, and the first terminals of the second high-frequency isolation converters of the multiple power supply units are connected in parallel.

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