Power module and uninterruptible power supply

Abstract

The present disclosure relates to the technical field of power supplies, and provides a power module and an uninterruptible power supply. The power module comprises a housing, a circuit board, fuses, a power connector, and insulating protective frames; a power conversion circuit is integrated on the circuit board arranged in the housing, a first wiring terminal and a second wiring terminal of each fuse are both fixed on the circuit board, the fuses are used for disconnecting an input or output of the power conversion circuit, the first wiring terminals are used for being electrically connected to the power conversion circuit, and the second wiring terminals are electrically connected to the power connector by means of cables; the power connector is arranged on the wall of the housing; the protective frames are arranged on the circuit board, each protective frame comprises a plurality of side walls, and the plurality of side walls surround the second wiring terminal of the corresponding fuse. The present disclosure can improve the application safety of the power module.

Description

Power modules and uninterruptible power supplies

[0001] This disclosure claims priority to Chinese Patent Application No. 202422522415.7, filed on October 17, 2024, entitled "Power Module and Uninterruptible Power Supply", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of power supply technology, and in particular to a power conversion circuit and a power supply system. Background Technology

[0003] An uninterruptible power supply (UPS) is a device that continuously and uninterruptedly supplies power to a load and is widely used in many fields such as communications, finance, and healthcare.

[0004] A UPS mainly consists of multiple power modules. These power modules are used to convert the input AC power into stable AC power to supply power to the load, and also to convert the DC power input from the battery into stable AC power to supply power to the load.

[0005] Although current UPS systems are equipped with fuses, there is still a risk of short circuits. The short circuit current is relatively large, which generates a lot of heat inside the UPS, resulting in significant safety hazards during UPS operation. Summary of the Invention

[0006] This disclosure provides a power conversion circuit and a power supply system in which the external terminals of the power module and the connection points of external lines are protected by an insulation structure, which can prevent short circuits between different external terminals and thus reduce the risk of short circuits in the power supply system.

[0007] In a first aspect, this disclosure provides a power module, which includes a housing, a circuit board, a fuse, a power connector, and an insulating protective frame;

[0008] The circuit board housed within the housing integrates a power conversion circuit. The first and second terminals of the fuse are both fixed to the circuit board. The fuse is used to disconnect the input or output of the power conversion circuit. The first terminal is used to electrically connect to the power conversion circuit, and the second terminal is electrically connected to the power connector via a cable. The power connector is located on the wall of the housing.

[0009] The protective frame is disposed on the circuit board. The protective frame includes multiple sidewalls, and the second terminal of the fuse is sleeved on the multiple sidewalls. For example, the multiple sidewalls of the protective frame surround the second terminal, that is, the second terminal is located in the space enclosed by the multiple sidewalls.

[0010] In the solution disclosed herein, the use of an insulating protective frame to surround the exposed second terminals reduces the probability of interconnection between different second terminals, further reducing the probability of short circuits caused by interconnection between different second terminals in the power module, thereby improving the application safety of the power module.

[0011] In one possible implementation, the power conversion circuit has a multi-phase input and a multi-phase output, and the power module includes a plurality of fuses and a plurality of protective frames. The first terminal of each fuse is electrically connected to a phase input or a phase output for disconnecting the phase input or a phase output.

[0012] The power connector includes a power input connector and a power output connector, and the second terminal of each fuse is electrically connected to the power input connector or the power output connector via a cable.

[0013] The second terminals of the plurality of fuses and the plurality of protective frames are arranged at intervals in the same direction on the circuit board, and each second terminal is covered by a protective frame.

[0014] In the scheme disclosed herein, since both the input and output sides of the power module have fuses, a protective frame can be fitted onto the second terminal of the fuse on the input side of the power module, and / or, a protective frame can be fitted onto the second terminal of the fuse on the output side of the power module. Furthermore, since both the input and output of the power module are AC voltages, the power module's input includes multi-phase inputs, and its output includes multi-phase outputs; therefore, a protective frame can be fitted onto the second terminal of each phase input or each phase output. Thus, regardless of whether the protective frame is arranged on the input side or the output side, the number of protective frames is always multiple. Because the protective frame is fitted onto the second terminal, the arrangement direction of the multiple protective frames is the same as the arrangement direction of the multiple second terminals.

[0015] In one possible implementation, the power conversion circuit also has a positive input and a negative input, with the first terminal of each fuse electrically connected to one of the multi-phase inputs, the positive input, and the negative input, or electrically connected to a phase output, for disconnecting an input or a phase output.

[0016] In the scheme shown in this disclosure, the input of the power module may also include a DC input. Therefore, the input of the power module also includes a positive input and a negative input. Since fuses are arranged on both the positive input and the negative input, the second terminal on the positive input is also protected by a protective frame, and the second terminal on the negative input is also protected by a protective frame.

[0017] In one possible implementation, the arrangement direction of the first and second terminals of each fuse intersects with the arrangement direction of the second terminals of the plurality of fuses, such as perpendicularly, and the plurality of protective frames are integrally formed.

[0018] In the solution disclosed herein, since the arrangement direction of the first and second terminals of the fuse is the same as the arrangement direction of the multiple second terminals, there are no components separating adjacent protective frames fitted onto each of the second terminals. Therefore, these multiple protective frames can be integrally molded. This integrally molded multiple protective frames enable multiple protective frames to be installed on the circuit board simultaneously, saving assembly time and improving the assembly efficiency of the power module.

[0019] In one possible implementation, the arrangement direction of the first and second terminals of each fuse is the same as the arrangement direction of the second terminals of the plurality of fuses, and the plurality of protective frames are separately formed.

[0020] In the solution disclosed herein, since the arrangement direction of the two terminals of the fuse is the same as the arrangement direction of the multiple second terminals, adjacent second terminals are separated by the first terminal and the body portion between the two terminals of the fuse. In this scenario, the protective frame fitted onto each second terminal can be molded separately. The multiple separately molded protective frames can have identical structures, thus requiring only one mold for processing. Furthermore, the multiple separately molded protective frames use less material, reducing material costs, and the molds used are simpler, reducing mold design and processing costs.

[0021] In one possible implementation, the power conversion circuit also has a neutral terminal located between the two phases;

[0022] The integrally formed structure of the multiple protective frames has a through groove at the position corresponding to the neutral wire terminal, which is used to raise and fix the fixing seat of the neutral wire terminal, located in the through groove; the groove wall of the through groove, which is parallel to the length direction of the integrally formed structure, has heat dissipation holes.

[0023] In the solution disclosed herein, since the neutral wire terminal is not energized and no protection is required, the groove where the fixing base of the neutral wire terminal is located can have heat dissipation holes on the groove wall to dissipate heat from the circuit board and cool the circuit board and its components.

[0024] In one possible implementation, the protective frame includes two sidewalls, and the second terminal of the fuse is located in the space enclosed by the fuse and the two sidewalls.

[0025] In the scheme disclosed herein, the two sidewalls are positioned opposite each other, the second terminal of the fuse extends between the two sidewalls, and the protective frame has an opening on the side opposite the fuse. This opening can be sealed with a plug, wherein the plug is insulating. Thus, when adhesive is subsequently poured into the protective frame through the opening in the top wall of the protective frame, the insulating adhesive is less likely to flow out from the opening on one side of the protective frame; the plug effectively solidifies the adhesive and restricts its flow.

[0026] In the scheme shown in this disclosure, the two sidewalls can also be adjacent. The second terminal of the fuse extends into the protective frame. The protective frame has an opening on the side adjacent to the fuse, and this opening can be sealed with a plug, wherein the plug is insulating. This way, when adhesive is subsequently poured into the protective frame through the opening in the top wall of the protective frame, the insulating adhesive is less likely to flow out from the opening on one side of the protective frame. The plug effectively solidifies the adhesive and restricts its flow.

[0027] In one possible implementation, the protective frame includes three side walls and a top wall, and the second terminal of the fuse is located in the space enclosed by the fuse, the three side walls and the top wall;

[0028] One of the three sidewalls or the top wall has an opening for cable insertion.

[0029] In the scheme shown in this disclosure, the protective frame includes three side walls. One side of the protective frame is open, and the second terminal of the fuse can be extended into the protective frame through the opening on one side of the protective frame. The protective frame also includes a top wall, so that the second terminal is completely surrounded by the three side walls, the top wall, and the fuse. Therefore, it is less likely for different second terminals to be connected, further improving the safety of the power module.

[0030] Since the cable connected to the second terminal needs to extend into the frame of the protective frame, one of the side walls of the protective frame, or the top wall of the protective frame, may have an opening, through which the cable can extend into the frame of the protective frame.

[0031] In one possible implementation, the height of the sidewall of the protective frame is at least greater than the height of the second terminal away from the top of the circuit board.

[0032] In the solution disclosed herein, the height of the side wall of the protective frame is at least higher than the top of the second terminal, which on the one hand better surrounds the second terminal, and on the other hand, the insulating adhesive is less likely to flow out of the frame during subsequent potting.

[0033] In one possible implementation, the protective frame has a top opening, or the protective frame includes a top wall with an opening, through which insulating adhesive is poured into the protective frame and wraps around the second terminal and the electrical connection of the cable.

[0034] In the solution disclosed herein, insulating glue is poured into the frame of the protective frame. The insulating glue completely covers the second terminal and the connection between the second terminal and the cable, which further improves the insulation performance at the second terminal, further reduces the probability of interconnection between different second terminals, and further improves the application safety of the power module.

[0035] In a second aspect, an uninterruptible power supply is provided, the uninterruptible power supply including a cabinet, a bypass module located in the cabinet, and a plurality of power modules as described in any of the first aspects;

[0036] The input terminal of the uninterruptible power supply is connected to the input terminal of the bypass module and the input terminal of each power module, and the output terminal of the uninterruptible power supply is connected to the output terminal of the bypass module and the output terminal of each power module. Attached Figure Description

[0037] Figure 1 is a schematic diagram of an application scenario of a UPS provided in an exemplary embodiment of this disclosure;

[0038] Figure 2 is a schematic diagram of the internal circuit principle of a UPS provided in an exemplary embodiment of this disclosure;

[0039] Figure 3 is a schematic diagram of the circuit principle of a single power module provided in an exemplary embodiment of this disclosure;

[0040] Figure 4 is a schematic diagram of the circuit principle of a single power module provided in an exemplary embodiment of this disclosure;

[0041] Figure 5(a) is a schematic diagram of a short circuit caused by the connection of two first terminals on the input side of a power module provided in an exemplary embodiment of the present disclosure, and (b) is a schematic diagram of a short circuit caused by the connection of two second terminals on the input side of a power module provided in an exemplary embodiment of the present disclosure.

[0042] Figure 6(a) is a schematic diagram of a short circuit caused by connecting the two first terminals on the output side of a power module provided in an exemplary embodiment of the present disclosure, and (b) is a schematic diagram of a short circuit caused by connecting the two second terminals on the output side of a power module provided in an exemplary embodiment of the present disclosure.

[0043] Figure 7 is a partial structural diagram of a power module on the input side provided in an exemplary embodiment of this disclosure;

[0044] Figure 8 is a partial structural diagram of a power module on the output side provided in an exemplary embodiment of this disclosure;

[0045] Figure 9 is a schematic diagram of the multiple protective frames integrally formed in Figure 7;

[0046] Figure 10 is a partial structural diagram of a power module on the input side provided in an exemplary embodiment of this disclosure;

[0047] Figure 11 is a top view of a power module provided on the input side according to an exemplary embodiment of the present disclosure;

[0048] Figure 12 is a structural schematic diagram of any one of the protective frames in Figure 8;

[0049] Figure 13 is another schematic diagram illustrating the structure shown in Figure 7;

[0050] Figure 14 is a top view of a power module provided in an exemplary embodiment of this disclosure on the input side;

[0051] Figure 15 is a partial structural diagram of a power module on the output side provided in an exemplary embodiment of this disclosure.

[0052] Figure Label Explanation: 10. Power Module; 20. Bypass Module. 1. Housing; 2. Circuit Board; 3. Fuse; 31. First Terminal; 32. Second Terminal; 4. Power Input Connector; 5. Power Output Connector; 6. Protective Frame; 61. Side Wall; 62. Bottom Wall; 63. Channel; 64. Through Slot; 7. Sealing Plug; 8. Mounting Base; 91. Neutral Line Input Terminal; 92. Neutral Line Output Terminal. 21. Power Conversion Circuit; 211. Rectifier Circuit; 212. Inverter Circuit; 213. DC-DC Converter Circuit. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0054] This embodiment relates to an uninterruptible power supply (UPS), as shown in Figure 1, which is a schematic diagram of a UPS scenario. Referring to Figure 1, the UPS power input includes multiple AC inputs. Figure 1 illustrates two AC inputs, one of which comes from the mains power supply as the main input, and the other AC input can come from a generator as a bypass input. For example, referring to Figure 1, the mains power supply and the generator can provide power to the UPS through an input distribution cabinet. Continuing to refer to Figure 1, the UPS power input also includes a DC input, which comes from a battery. The battery can be integrated into the UPS cabinet or arranged separately in a battery cabinet.

[0055] A UPS is used to provide uninterrupted power to a load. Referring to Figure 1, a UPS supplies power to multiple loads through an output distribution cabinet. These loads can be one or more servers, lighting, or temperature control systems in a data center, commercial building, or residential building.

[0056] Figure 2 shows the circuit diagram corresponding to the scenario shown in Figure 1. Referring to Figure 2, the UPS includes multiple power modules, a bypass module, and a load terminal H. Each power module has an AC input and a DC input. The AC input is connected to the mains input to receive power from the mains, and the DC input is connected to the battery to receive power from the battery. The bypass module's power input is connected to the bypass input to receive power from the generator. Continuing to refer to Figure 2, the power outputs of each power module and the bypass module 20 are all connected to the load terminal H, which is used to connect to the load.

[0057] Referring again to Figure 2, each power module includes a rectifier circuit 211, an inverter circuit 212, and a DC-DC converter circuit 213. The rectifier circuit 211 is also called a rectifier, the inverter circuit 212 is also called an inverter, and the DC-DC converter circuit 213 is also called a DC-DC converter. The input terminal of the rectifier circuit 211 is electrically connected to the main input, and the output terminal of the rectifier circuit 211 is connected to the input terminal of the inverter circuit 212. The output terminal of the inverter circuit 212 is electrically connected to the load terminal H. The input terminal of the DC-DC converter circuit 213 is electrically connected to the battery, and the output terminal of the DC-DC converter circuit 213 is connected to the input terminal of the inverter circuit 212. For example, referring to Figure 2, the output terminal of the DC-DC converter circuit 213 is connected to the connection line between the rectifier circuit 211 and the inverter circuit 212.

[0058] Thus, referring to Figure 2, under normal main input conditions, the main input provides AC voltage to rectifier circuit 211. Rectifier circuit 211 converts the AC voltage of the main input into a stable DC voltage and outputs it to inverter circuit 212. Inverter circuit 212 converts the stable DC voltage into a stable AC voltage required by the load and outputs it to load terminal H, thereby supplying power to the load.

[0059] Referring to Figure 2, in the event of an abnormal main input, the battery provides DC voltage to the DC-DC converter circuit 213. The DC-DC converter circuit 213 converts the DC voltage received from the battery into a stable DC voltage and outputs it to the inverter circuit 212. The inverter circuit 212 converts the stable DC voltage into a stable AC voltage and outputs it to the load terminal H, thereby supplying power to the load.

[0060] Because the battery's energy storage capacity is limited, in the event of a continuous main input anomaly, the UPS switches its power supply from the battery input to the bypass input. Referring to Figure 2, the bypass input provides AC power to the bypass module, which then directly delivers the AC power to the load terminal H, supplying power to the load. Therefore, the UPS can provide continuous power to the load.

[0061] The above is a brief introduction to continuous phase load power supply by UPS. This introduction is only for the convenience of understanding the uninterrupted power supply process of UPS and does not make specific limitations on this embodiment. This embodiment does not limit how the UPS achieves uninterrupted power supply to the load, or how the main input, battery input and bypass input are switched.

[0062] Figure 3 shows a schematic diagram of the structure of any power module shown in Figure 2. Referring to Figure 3, the power module includes a housing 1 and a circuit board 2 located inside the housing 1. The circuit board 2 integrates a power conversion circuit 21, which includes the aforementioned rectifier circuit 211, inverter circuit 212, and DC-DC converter circuit 213.

[0063] Referring to Figure 3, the outer casing 1 is equipped with a power input connector 4 and a power output connector 5. The power input connector 4 is used to connect to the power input interface inside the UPS cabinet, such as when the power input connector 4 is inserted into the power input interface. The power output connector 5 is used to connect to the power output interface inside the UPS cabinet, such as when the power output connector 5 is inserted into the power output interface.

[0064] As described above, the power input of the power module includes AC input and DC input. In one embodiment, referring to Figure 3, the AC input and DC input are integrated into a single power input connector, which includes an AC input terminal and a DC input terminal. In another embodiment, the AC input forms an AC input connector, and the DC input forms a DC input connector. This embodiment does not limit whether the AC input and DC input are integrated into a single connector. Taking the example of integration into a single connector in Figure 3, this connector is denoted as power input connector 4.

[0065] Referring again to Figure 3, to improve the reliability and safety of the power module, the power module will also include a fuse 3. For example, a fuse 3 is arranged at the input terminal of the power conversion circuit 21, and a fuse 3 is also arranged at the output terminal of the power conversion circuit 21. Since the power conversion circuit 21 includes AC input and DC input, as shown in Figure 3, a fuse 3 is arranged at both the AC input terminal and the DC input terminal of the power conversion circuit 21.

[0066] AC voltage generally includes multiple phases, such as two-phase AC voltage or three-phase AC voltage, while DC voltage includes positive and negative terminals.

[0067] Figure 4 shows a schematic diagram of any power module in Figure 2, specifically illustrating the multiphase, positive, and negative terminals shown in Figure 3. In Figure 4, the three phase lines and one neutral line of the multiphase AC power supply are labeled A-phase, B-phase, C-phase, and N-line, respectively. Referring to Figure 4, on the input side of the power module, a fuse 3 is connected between the A-phase input of the rectifier circuit 211 and the A-phase input of the power input connector 4 to disconnect the A-phase input; a fuse 3 is also connected between the B-phase input of the rectifier circuit 211 and the B-phase input of the power input connector 4 to disconnect the B-phase input; a fuse 3 is also connected between the C-phase input of the rectifier circuit 211 and the C-phase input of the power input connector 4 to disconnect the C-phase input; the N-line is not energized, therefore, no fuse 3 needs to be connected between the N-line input of the rectifier circuit 211 and the N-line input of the power input connector 4. A fuse 3 is connected between the positive input of the DC-DC converter circuit 213 and the positive input of the power input connector 4. The fuse 3 is used to disconnect the positive input. A fuse 3 is also connected between the negative input of the DC-DC converter circuit 213 and the negative input of the power input connector 4. The fuse 3 is used to disconnect the negative input.

[0068] Referring again to Figure 4, on the output side of the power module, a fuse 3 is connected between the A-phase output of inverter circuit 212 and the A-phase output of power output connector 5. This fuse 3 is used to disconnect the A-phase output. A fuse 3 is also connected between the B-phase output of inverter circuit 212 and the B-phase output of power output connector 5. This fuse 3 is used to disconnect the B-phase output. A fuse 3 is also connected between the C-phase output of inverter circuit 212 and the C-phase output of power output connector 5. This fuse 3 is used to disconnect the C-phase output. No fuse 3 is required between the N-line output of inverter circuit 212 and the N-line output of power output connector 5.

[0069] Therefore, referring to Figure 4, each fuse 3 includes two terminals, one designated as the first terminal 31 and the other as the second terminal 32. Both terminals are fixed on the circuit board 2. The first terminal 31 is used to electrically connect to the power conversion circuit 21, and the second terminal 32 is used to electrically connect to the power connector. For example, referring to Figure 3, on the input side of the power module, the first terminal 31 is used to electrically connect to the rectifier circuit 211 or the DC-DC converter circuit 213, and the second terminal 32 is used to connect to the power input connector 4 via a cable (the thick curve in Figure 3 represents the cable). On the output side of the power module, the first terminal 31 is used to electrically connect to the inverter circuit 212, and the second terminal 32 is used to connect to the power output connector 5 via a cable.

[0070] Currently, whether it's the fuse on the input side or the fuse on the output side of the power module, the first terminal 31 and the second terminal 32 of fuse 3 are generally exposed. If a conductive material comes into contact between the two first terminals 31 or the two second terminals 32, a short circuit will occur. While a short circuit caused by an exposed first terminal 31 will not pose a safety issue, a short circuit caused by an exposed second terminal 32 will cause a safety problem, or the UPS may fail to supply power to the load. The reasons are explained below.

[0071] Figure 5 shows a partial schematic diagram of fuse 3 on phase A input and fuse 3 on phase B input in Figure 4. Referring to Figure 5(a), the first terminal 31 of fuse 3 on phase A input is connected to the first terminal 31 of fuse 3 on phase B input. Short-circuit current flows through these two fuses 3. The circuit current is relatively large, and the two fuses 3 can blow in time, preventing safety issues. However, referring to Figure 5(b), the second terminal 32 of fuse 3 on phase A input is connected to the second terminal 32 of fuse 3 on phase B input. Short-circuit current does not flow through these two fuses 3. Therefore, these two fuses 3 will not blow in time, and the relatively large short-circuit current will generate a large amount of heat on the power input connector 4 and the cable connected to it, potentially causing a fire.

[0072] Figure 6 shows a partial schematic diagram of the fuse 3 on phase A output and the fuse 3 on phase B output in Figure 4. Referring to Figure 6(a), the first terminal 31 of the fuse 3 on phase A output is connected to the first terminal 31 of the fuse 3 on phase B output. Referring to Figure 2, since the output terminals of all power modules are connected to the load terminal H, after the two first terminals 31 are connected, the current in other power modules will flow into the A-phase output or the B-phase output. The resulting short-circuit current is relatively large, causing the two fuses 3 in Figure 6(a) to blow in time. Thus, although the power module where the connection is made cannot supply power to the load, other power modules can still supply power to the load.

[0073] However, referring to Figure 6(b), the second terminal 32 of the fuse 3 on phase A output is connected to the second terminal 32 of the fuse 3 on phase B output. Referring to Figure 2, since the output terminals of all power modules are electrically connected to the load terminal H, after the two second terminals 32 are connected, the current from other power modules will flow into the phase A output or the phase B output. However, the resulting short-circuit current does not pass through the fuse 3 in Figure 6, and cannot cause the fuse 3 to blow. The short-circuit current is relatively large, which will cause a lot of heat to be generated on the power output connector 5 and the cable connected to the power output connector 5, thus causing a fire. In addition, the A phase of the load terminal H serves as the common point of the second terminal 32 on the A phase of all power modules, and the B phase of the load terminal H serves as the common point of the second terminal 32 on the B phase of all power modules. This will cause a short circuit between the second terminal 32 on the A phase output and the second terminal 32 on the B phase output inside each power module. Therefore, the two second terminals 32 on the output side will be connected. Even if a fire does not occur, the UPS will be unable to supply power to the load.

[0074] Therefore, this embodiment provides a power module that provides insulation protection for the second terminal 32 of the fuse on the input or output side of the power module, making it less likely for short circuits to occur between different second terminals 32 on the input or output side, thereby improving the application safety of the power module.

[0075] In this embodiment, the power module can be any one of the power modules shown in Figures 1 and 2, and its circuit structure diagram can be found in Figures 2 to 4. In addition to the aforementioned housing 1, circuit board 2, fuse 3, power input connector 4, and power output connector 5, the power module also includes an insulating protective frame 6. The protective frame 6 is mounted on the circuit board 2. For example, the protective frame 6 may be located on the circuit board 2 but not fixed to it; or it may be located on the circuit board 2 and fixed to it. The protective frame 6 includes multiple sidewalls, and the second terminal 32 of the fuse 3 is fitted onto each sidewall. For example, the multiple sidewalls of the protective frame 6 surround the second terminal 32 of the fuse 3, and the second terminal 32 of the fuse 3 is located within the area enclosed by the multiple sidewalls.

[0076] In one example, the protective frame 6 can be fitted onto the second terminal 32 of the fuse 3 on the input side of the power module, or onto the second terminal 32 of the fuse 3 on the output side of the power module. Alternatively, a portion of the protective frame 6 can be fitted onto the second terminal 32 of the fuse 3 on the input side of the power module, and another portion can be fitted onto the second terminal 32 of the fuse 3 on the output side of the power module. That is, the protective frame 6 can be arranged on the input side of the power module, on the output side of the power module, or both.

[0077] As described above, the input side of the power module includes AC input, which can be multi-phase, such as two-phase or three-phase input. For ease of explanation, a three-phase input is used as an example. Therefore, there are multiple protective frames 6, and the second terminal 32 of the fuse 3 on each phase input is covered by a protective frame 6. The input side of the power module can also include DC input, which includes a positive input and a negative input. The second terminal 32 of the fuse 3 on both the positive and negative inputs can be covered by a protective frame 6. In this embodiment, for ease of explanation, the power module's input side includes both three-phase AC input and DC input, and the protective frames 6 are arranged on each phase of the three-phase AC input, as well as on both the positive and negative inputs.

[0078] For example, Figure 7 shows a schematic diagram of the power module shown in Figures 1 to 4 on the input side. The cable connected to the second terminal 32 and the power input connector 4 connected to the cable are not shown in Figure 7. Referring to Figure 7, the second terminals 32 of the fuses 3 on phase A, phase B, phase C, positive, and negative inputs are all encased in protective frames 6, which provide insulation protection for these second terminals 32.

[0079] As described above, power modules are generally AC output, including multi-phase output, such as two-phase or three-phase output. For ease of explanation, a three-phase output is used as an example. The second terminal 32 of the fuse 3 on each phase output is covered by a protective frame 6. For example, as shown in Figure 8, which is a structural diagram of the power module shown in Figures 1 to 4 on the output side, the second terminal 32 of the fuse 3 on phase A output, the second terminal 32 of the fuse 3 on phase B output, and the second terminal 32 of the fuse 3 on phase C output are all covered by protective frames 6. These protective frames 6 provide insulation protection for these second terminals 32.

[0080] As shown in Figures 7 and 8, the arrangement direction of the multiple protective frames on both the input and output sides of the power module is the same as the arrangement direction of the multiple second terminals 32. For example, the arrangement direction of the multiple second terminals 32 on the input side on the circuit board 2 is the same as the arrangement direction of the multiple protective frames 6 on the input side on the circuit board 2, and each second terminal 32 is enclosed by a protective frame 6. Similarly, the arrangement direction of the multiple second terminals 32 on the output side on the circuit board 2 is the same as the arrangement direction of the multiple protective frames 6 on the output side on the circuit board 2, and each second terminal 32 is enclosed by a protective frame 6.

[0081] As an example, on the input or output side, if the arrangement direction of the first terminal 31 and the second terminal 32 of each fuse 3 intersects with the arrangement direction of the plurality of second terminals 32, for example, as shown in Figure 7, on the input side, the arrangement direction of the first terminal 31 and the second terminal 32 of each fuse 3 intersects perpendicularly with the arrangement direction of the plurality of second terminals 32, wherein the arrangement direction of the first terminal 31 and the second terminal 32 is a first direction, and the arrangement direction of the plurality of second terminals 32 is a second direction, and the first direction and the second direction are perpendicular, then, referring to Figure 7, there are no components between any two adjacent protective frames 6, and these plurality of protective frames 6 can be integrally manufactured, as shown in Figure 9, which is a schematic diagram of the integrally formed structure of the plurality of protective frames 6 in Figure 7.

[0082] Of course, even if the arrangement direction of the first terminal 31 and the second terminal 32 intersects with the arrangement direction of the multiple second terminals 32, the multiple protective frames 6 can be formed separately, and each protective frame 6 can be individually fitted onto a second terminal 32.

[0083] The integrated fabrication of multiple protective frames 6 makes them easier to install, saves time, and increases assembly efficiency when assembled onto the circuit board 2 compared to assembling them individually.

[0084] As another example, on the input or output side, if the arrangement direction of the first terminal 31 and the second terminal 32 of each fuse 3 is the same as the arrangement direction of the multiple second terminals 32, for example, as shown in Figure 8, on the output side, the arrangement direction of the first terminal 31 and the second terminal 32 of each fuse 3 is the second direction. Then, referring to Figure 8, adjacent protective frames 6 are separated by the body portion between the two terminals of the fuse 3 and the first terminal 31. Therefore, multiple protective frames 6 are separately formed, each individually fitted onto a second terminal 32. This separate forming of multiple protective frames 6 helps to save material for the protective frames, reduce costs, and also simplifies the mold structure for processing the protective frames 6, saving mold design costs.

[0085] In one example, multiple integrally formed protective frames 6 are used in scenarios where the neutral (N) line terminal is located between two phases. For example, as shown in Figure 10, which is a schematic diagram without protective frames 6 based on Figure 7, the N line input terminal 91 is located between the fuse 3 on phase B and the fuse 3 on phase C, and the position of the N line input terminal 91 is closer to the second terminal 32 than the first terminal 31. If the multiple integrally formed protective frames 6 are applied to the input side shown in Figure 10, then as shown in Figure 7, the N line terminal is also covered by a protective frame 6. The protective frame 6 covering the N line terminal is formed by two adjacent left and right protective frames 6. As shown in Figure 7, one sidewall of the protective frame 6 on the phase C input and one sidewall of the protective frame 6 on the phase B input sandwich the N line terminal in the middle, forming the protective frame covering the N line terminal. Therefore, referring to Figure 9, the integrated protective frame also includes the protective frame for mounting the N-line terminal.

[0086] It should be noted that if the multiple integrated protective frames 6 are applied to the edge of the N-line terminal, for example, on one side of all the second terminals 32 as shown in Figure 8, then the integrated protective frames do not need to include a protective frame for housing the N-line terminal. Even if the separate protective frames 6 are applied in a scenario where the N-line terminal is located between two phases, since the multiple protective frames 6 are independent and not connected, the N-line terminal does not need to be covered by a protective frame. Therefore, referring to Figure 8, the multiple protective frames 6 are separately formed, and the N-line output terminal 92 is also on one side of all the second terminals 32; therefore, the N-line output terminal 92 is not covered by a protective frame 6.

[0087] The above describes the arrangement direction and forming method of multiple protective frames 6. The following describes the structural features of the protective frame 6.

[0088] As described above, the protective frame 6 includes multiple sidewalls. For example, the protective frame 6 may include two sidewalls. The two sidewalls of the protective frame 6 and the protective frame 6 enclosing the second terminal 32 may be the two sidewalls of the protective frame 6 and the fuse 3 where the second terminal 32 is located, enclosing the second terminal 32 within them.

[0089] Referring to Figure 7, the two side walls 61 of the protective frame 6 are positioned opposite each other, and the second terminal 32 of the fuse 3 extends between the two side walls 61. The body portion of the fuse 3 between the two terminals, together with the two side walls 61 of the protective frame 6, encloses the second terminal 32 of the fuse 3. Continuing to refer to Figure 7, the protective frame 6 has an opening on the side opposite the fuse 3, allowing the cable connected to the second terminal 32 to extend through.

[0090] Furthermore, referring to Figure 7, the top of the protective frame 6 can also be open. This opening at the top and side of the protective frame 6 facilitates the connection of the cable to the second terminal 32 of the fuse, and also facilitates cable extension. For example, as shown in Figure 11, a top view of the structure shown in Figure 7, after the cables are connected to each of the second terminals 32, multiple cables converge at the power input connector 4. Referring to Figure 11, the openings on one side and the top of the protective frame 6 allow the cables to extend and facilitate tightening bolts during wiring.

[0091] Referring to Figure 8, the arrangement direction of the two opposite sidewalls 61 of the protective frame 6 can be the same as the arrangement direction of multiple protective frames 6. In this case, two adjacent protective frames 6 can share a sidewall 61. Of course, two adjacent protective frames 6 can also not share a sidewall 61, such as the protective frame on the positive input and the protective frame on the A-phase input connected by a horizontal plate.

[0092] In one example, referring to Figure 8, the two sidewalls 61 of the protective frame 6 can also be adjacent to each other. The protective frame 6 has openings on both sides opposite to the two sidewalls. In this case, the second terminal 32 of the fuse 3 extends into the protective frame 6 through one of the openings, such that the two sidewalls 61 of the protective frame 6 and the body portion between the two terminals of the fuse 3 enclose the second terminal 32. The cable used to connect to the second terminal 32 can extend through the opening on the other side of the protective frame 6. Furthermore, referring to Figure 8, the top of the protective frame 6 can also be open. This top opening facilitates the connection of the second terminal 32 to the cable, such as for tightening bolts.

[0093] In another example, whether it's the input-side protective frame 6 or the output-side protective frame 6, the number of sidewalls 61 of the protective frame 6 can also be three, as shown in Figure 12. Figure 12 is a structural schematic diagram of one of the protective frames 6 in Figure 8. Referring to Figure 12, the protective frame 6 includes three sidewalls 61, and its shape is a quadrilateral box structure. One side of the protective frame 6 is open. Referring to Figure 8, the second terminal 32 of the fuse 3 can extend into the space inside the protective frame 6 through the open opening. The three sidewalls 61 of the protective frame 6, and the body portion between the two terminals of the fuse 3, enclose the second terminal 32. Continuing to refer to Figure 12, the protective frame 6 with three sidewalls 61 can have an open top to facilitate cable insertion and connection. Furthermore, referring to Figure 12, one of the side walls 61 of the protective frame 6, including the side wall 61 adjacent to the fuse 3, may have an opening. This opening communicates with the top opening. The cable used for connecting to the second terminal 32 can then extend into the protective frame 6 through this opening and connect to the second terminal 32. In this way, the opening on the side wall of the protective frame 6 facilitates the insertion of one end of the cable into the protective frame, and the top opening of the protective frame 6 facilitates the connection of the cable to the second terminal and the tightening of the bolt.

[0094] In another example, whether it's the input-side protective frame 6 or the output-side protective frame 6, the number of sidewalls 61 of the protective frame 6 can also be four. One of the sidewalls 61 of the protective frame 6 has an opening so that the second terminal 32 of the fuse 3 can pass through the opening and extend into the protective frame 6. The top of the protective frame 6, which includes four sidewalls 61, can be open to facilitate the insertion of cables into the protective frame 6 and to facilitate the tightening of bolts during wiring. Another sidewall of the protective frame 6, which includes four sidewalls, can also have an opening so that cables can pass through this opening and extend into the protective frame 6.

[0095] In one example, regardless of the number of sidewalls 61 included in the protective frame 6, referring to Figure 13, the height of the sidewalls 61 is at least higher than the height of the second terminal 32 away from the top of the circuit board 2. In this way, the sidewalls of the protective frame 6 can surround the second terminal 32, reducing the probability of connection to other second terminals 32. Furthermore, it facilitates subsequent application of insulating adhesive, preventing the adhesive from flowing out of the protective frame 6. The adhesive application method within the protective frame is described below.

[0096] It should be noted that the second terminal 32 of the fuse 3 mentioned above extends into the protective frame 6. Not only does the second terminal 32 extend into the protective frame 6, but the body of the fuse 3 also extends into the protective frame 6. In this way, the side wall of the protective frame 6 and the body of the fuse 3 surround the second terminal 32.

[0097] The above describes the protective frame 6 including the side walls and top wall. The following describes the protective frame 6 including the bottom wall.

[0098] In one example, the protective frame 6 on both the input and output sides may not include a bottom wall. This is because the second terminal 32 and the protective frame 6 are both located on the circuit board 2. Therefore, referring to Figure 8, the bottom of the side wall of the protective frame 6 can be directly fixed to the circuit board 2.

[0099] In another example, the protective frame 6 may also include a bottom wall. Before introducing the bottom wall, we will first introduce how the two terminals of the fuse 3 are fixed on the circuit board 2. Whether it is an input-side fuse or an output-side fuse, the two terminals of the fuse 3 are generally mounted on the circuit board 2 by mounting brackets. For example, referring to Figure 10, the mounting bracket 8 is fixed on the circuit board 2, the first terminal 31 of the fuse 3 is fixed to one mounting bracket 8, and the second terminal 32 of the fuse 3 is fixed to another mounting bracket 8.

[0100] If the area of ​​the conductive piece extending from the end of the fuse 3 of the second terminal 32 is substantially equal to the top area of ​​the mounting base 8, then the protective frame 6 does not need to include a bottom wall 62. The side wall 61 of the protective frame 6 can extend vertically upward from the circuit board 2 beyond the top of the second terminal 32. However, as shown in Figure 10, if the area of ​​the conductive piece of the second terminal 32 is not equal to the top area of ​​the mounting base 8 (for example, if the area of ​​the conductive piece is larger than the top area of ​​the mounting base 8), then, as shown in Figure 13, which is a schematic diagram of another view of Figure 7, the protective frame 6 can include a bottom wall 62, with the side wall 61 located above the bottom wall 62 facing away from the circuit board 2. The bottom wall 62 has a channel 63 below it, and the channel wall of the channel 63 is used to support the protective frame 6 on the circuit board 2. The mounting base below the second terminal 32 is located in the channel 63 below the bottom wall. Specifically, the cross-sectional shape of channel 63 can be quadrilateral, and channel 63 can include four channel walls, so that when insulating glue is poured into the protective frame later, the insulating glue will not flow out from channel 63.

[0101] Referring to Figure 13, in the design of the protective frame 6 including the bottom wall 62, the bottom wall 62 has multiple side walls 61 facing away from the upper part of the circuit board 2, which are used to surround the second terminal 32. The channel 63 of the bottom wall 62 facing the lower part of the circuit board 2 is used to surround the mounting base for raising and fixing the second terminal 32, and also to support it on the circuit board.

[0102] It should be noted that, as shown in Figure 9, the bottom wall of the protective frame 6 has an opening that communicates with the channel 63, which allows the bolt of the second terminal 32 to be screwed onto the mounting base.

[0103] It should be noted that the mounting brackets used to elevate and secure the terminals can be made of metal (conductive) or insulating material (non-conductive). Whether the mounting bracket is conductive depends primarily on whether there is an electrical connection between the terminal and circuit board 2. If there is an electrical connection, the mounting bracket is conductive; otherwise, it is not.

[0104] In one example, regarding the fixing of the protective frame 6 to the circuit board 2, the bottom of the protective frame 6 can be glued to the circuit board, or the bottom of the protective frame 6 can be snapped onto the circuit board using a snap-fit ​​structure. For example, for a protective frame 6 excluding the bottom wall, the bottom of its side walls can be glued to the circuit board or snapped onto the circuit board using a snap-fit ​​structure. As another example, for a protective frame 6 including the bottom wall, the bottom of the channel below the bottom wall can be glued to the circuit board or snapped onto the circuit board using a snap-fit ​​structure.

[0105] The above describes the structural features of the protective frame 6. As can be seen, the protective frame 6 does not completely enclose the second terminal 32. It has openings or openings for cable insertion, facilitating wiring. Therefore, even after the second terminal 32 is fitted onto the protective frame 6, there will still be some exposed conductive structures. To address this, insulating adhesive can be injected into the protective frame 6 through these openings or openings. This adhesive will completely cover the second terminal 32 and the connection point between the second terminal 32 and the cable, further improving the insulation performance at the second terminal 32.

[0106] For example, referring to Figures 7 and 8, each protective frame 6 has an open top, allowing insulating adhesive to be poured into the protective frame 6 through the open top to cover the second terminal 32 and the connection between the second terminal 32 and the cable. Figure 14 shows a schematic diagram after adhesive has been poured into each protective frame 6 in Figure 7. Figure 15 shows a schematic diagram after adhesive has been poured into each protective frame shown in Figure 8. Referring to Figures 14 and 15, the insulating adhesive not only covers the second terminal 32 but also the connection between the second terminal 32 and the cable. In Figures 14 and 15, the black fill indicates the insulating adhesive.

[0107] In one example, because the insulating adhesive will flow into the area outside the protective frame 6 during the process of pouring it into the protective frame 6, as shown in Figure 8, for the protective frame 6 with openings in the sidewalls, the power module may also include a sealing plug 7. The sealing plug 7 seals the openings in the sidewalls 61 of the protective frame 6. Thus, as shown in Figure 15, the insulating adhesive poured into the protective frame 6 is not easily able to flow out of the protective frame 6 at the openings in the sidewalls due to the sealing plug, and instead flows to other locations on the circuit board 2.

[0108] It should be noted that, as shown in Figure 7, the two opposite side walls 61 of the protective frame can also be sealed with a sealing plug 7 to fix the insulating adhesive and prevent the insulating adhesive from flowing everywhere during the potting process.

[0109] In one example, since the side wall of the protective frame 6 has an opening for cable insertion, the sealing plug 7, which is sealed in the opening, can have a wire hole so that the cable can pass through the wire hole and extend into the frame space of the protective frame to electrically connect with the second terminal inside the protective frame.

[0110] As mentioned above, for multiple protective frames integrally formed and applied in a scenario where the N line terminal is located between two phases, the N line terminal is also covered by a protective frame. In this solution, since the N line terminal is not energized, no insulation protection is required. Therefore, as shown in Figure 14, the protective frame where the N line input terminal 91 is located does not need to be filled with insulating glue.

[0111] In one example, referring to Figure 14, the input side of the power module is fitted with protective frames for each of the second terminals 32, which are filled with insulating adhesive. However, the insulating adhesive has low heat dissipation. Therefore, referring to Figure 13, the integrated structure formed by multiple protective frames 6 has a through groove 64 at the corresponding N-line terminal. The N-line terminal and the mounting base 8 for raising and fixing the N-line terminal are located in the through groove 64. Continuing to refer to Figure 13, the groove wall of the through groove 64, which is parallel to the length direction of the integrated structure, has heat dissipation holes. The heat dissipation holes can dissipate heat to reduce the temperature of the input side of the power module.

[0112] In one example, the power transmitted by each phase of the power module is relatively large, both on the input and output sides. If single-wire transmission is used, the current transmitted on the cable will be large, resulting in significant losses and heat generation. Therefore, referring to Figures 8 and 11, a multi-wire parallel transmission method is adopted, such as a two-wire parallel transmission method. Thus, referring to Figures 7 and 8, each phase input or each phase output is connected to multiple fuses 3 (e.g., two fuses 3). For example, referring to Figure 7, phase A input includes two fuses 3 in parallel, phase B input includes two fuses 3 in parallel, and phase C input also includes two fuses 3 in parallel. Referring to Figure 8, phase A output includes two fuses 3 in parallel, phase B output includes two fuses 3 in parallel, and phase C output also includes two fuses 3 in parallel. Continuing to refer to Figures 7 and 8, multiple second terminals 32 of the same phase are enclosed by the same protective frame 6.

[0113] Similarly, as shown in Figure 11, the positive and negative inputs also transmit electrical energy in a multi-line parallel manner, such as by using three cables in parallel, with the three cables connected to the second terminal 32 of the same fuse.

[0114] In another example, referring to Figure 7, a fuse 3 on one phase input is separated from the fuse 3 on the positive input by a spacer. This is because the two fuses 3 are close together, and an insulating spacer is used to achieve electrical isolation. Similarly, any two fuses on any two phases can be electrically isolated using an insulating spacer if they are close together.

[0115] In this embodiment of the disclosure, the fuse on the input side of the power module, whose second terminal is used to connect to the power input connector, is covered by a protective frame, and / or the fuse on the output side of the power module, whose second terminal is used to connect to the power output connector, is covered by a protective frame. Since the protective frame is insulating, the second terminal is insulated and protected by the insulating protective frame, making it difficult for different second terminals to be connected and causing a short circuit in the power module, thereby improving the application safety of the power module.

[0116] This embodiment also provides a UPS. Referring to Figure 1, the UPS includes a cabinet, and a power module 10 and a bypass module 20 located in the cabinet. The power module 10 is the power module described above, and there are generally multiple of them.

[0117] In one example, the cabinet has slots for module insertion. Both power modules and bypass modules are inserted into the slots of the cabinet. The input terminals of each power module and the bypass module are connected to the input terminal of the UPS, and the output terminals of each power module and the bypass module are connected to the output terminal of the UPS.

[0118] For example, the back panel of the cabinet may have a power input interface (as the input terminal of the UPS) and a power output interface (as the output terminal of the UPS). Each power module 10's power input connector (as the input terminal of the power module) is inserted into a power input interface, and each power module 10's power output connector (as the output terminal of the power module) is inserted into a power output interface. Similarly, the bypass module 20's power input connector (as the input terminal of the bypass module) and power output connector (as the output terminal of the bypass module) are also inserted into a power input interface and a power output interface. The power input interface within the cabinet is used to connect to the power supply equipment, such as connecting to AC power or a generator. Since the power modules also have DC input, the power input interface connected to the power module's power input connector is also connected to a battery. The power output interface within the cabinet can be connected to the load terminal H, providing power to the load through the load terminal H. The application scenarios for the UPS are as described above and will not be repeated here.

[0119] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A power module, characterized by The power module includes a housing (1), a circuit board (2), a fuse (3), a power connector, and an insulated protective frame (6); The circuit board (2) housed within the outer casing (1) integrates a power conversion circuit (21). The first terminal (31) and the second terminal (32) of the fuse (3) are both fixed on the circuit board. The fuse (3) is used to disconnect the input or output of the power conversion circuit (21). The first terminal (31) is used to electrically connect with the power conversion circuit (21). The second terminal (32) is electrically connected to the power connector via a cable. The power connector is located on the wall of the outer casing (1). The protective frame (6) is disposed on the circuit board (2). The protective frame (6) includes multiple sidewalls, and the second terminal (32) of the fuse (3) is sleeved on the multiple sidewalls.

2. The power module of claim 1, wherein, The power conversion circuit (21) has multi-phase input and multi-phase output. The power module includes multiple fuses (3) and multiple protective frames (6). The first terminal (31) of each fuse (3) is electrically connected to one phase input or one phase output for disconnecting one phase input or one phase output. The power connector includes a power input connector (4) and a power output connector (5), and the second terminal (32) of each fuse (3) is electrically connected to the power input connector (4) or the power output connector (5) via a cable; The second terminals (32) of the plurality of fuses (3) and the plurality of protective frames (6) are arranged at intervals in the same direction on the circuit board (2), and each second terminal (32) is covered by a protective frame (6).

3. The power module of claim 2, wherein, The power conversion circuit (21) also has a positive input and a negative input. The first terminal (31) of each fuse (3) is electrically connected to one of the multi-phase inputs, the positive input and the negative input, or to one phase output, for disconnecting one input or one phase output.

4. The power module according to claim 2 or 3, characterized in that The arrangement direction of the first terminal (31) and the second terminal (32) of each fuse (3) intersects with the arrangement direction of the second terminal (32) of the plurality of fuses (3), and the plurality of protective frames (6) are integrally formed.

5. The power module according to claim 2 or 3, characterized in that The arrangement direction of the first terminal (31) and the second terminal (32) of each fuse (3) is the same as the arrangement direction of the second terminal (32) of the plurality of fuses (3), and the plurality of protective frames (6) are formed separately.

6. The power module of claim 4, wherein, The power conversion circuit (21) also has a neutral N-line terminal located between the two phases; The integral structure formed by the multiple protective frames (6) has a through groove (64) at the position corresponding to the neutral wire terminal, which is used to raise and fix the fixing seat (8) of the neutral wire terminal, located in the through groove (64); The groove wall of the through groove (64), which is parallel to the length direction of the integrally formed structure, has heat dissipation holes.

7. The power module of claim 1, wherein, The protective frame (6) includes two side walls (61), and the second terminal (32) of the fuse (3) is located in the space enclosed by the fuse (3) and the two side walls (61).

8. The power module of claim 7, wherein, The two side walls are positioned opposite each other, the second terminal (32) of the fuse (6) extends between the two side walls (61), and the protective frame (6) is open on the side opposite to the fuse (3).

9. The power module of claim 7, wherein, The two side walls are adjacent to each other, and the protective frame (6) has two openings on the sides opposite to the two side walls. The second terminal (32) of the fuse (6) extends into the protective frame (6) through the opening on one side of the protective frame (6).

10. The power module of claim 1, wherein, The protective frame (6) includes three side walls (61), one side of the protective frame (6) is open, and the second terminal (32) of the fuse (3) extends into the protective frame (6) through the opening on one side of the protective frame (6); One of the three sidewalls (61) has an opening.

11. The power module according to claims 8 to 10, characterized in that The power module also includes an insulating sealing plug (7) that seals an opening in one side of the protective frame (6) or an opening in the side wall (61).

12. The power module according to claim 1, characterized in that, The height of the sidewall of the protective frame (6) is at least greater than the height of the top of the second terminal (32) away from the circuit board (2).

13. The power module of claim 1, wherein, The protective frame (6) has a top opening, or the protective frame (6) includes a top wall with an opening, through which insulating adhesive is poured into the protective frame (6) and wraps the second terminal (32) and the electrical connection of the cable.

14. An uninterruptible power supply, characterized by The uninterruptible power supply includes a cabinet, a bypass module (20) located in the cabinet, and a plurality of power modules (10) as described in any one of claims 1 to 13; the input terminal of the uninterruptible power supply is connected to the input terminal of the bypass module and the input terminal of each power module, and the output terminal of the uninterruptible power supply is connected to the output terminal of the bypass module and the output terminal of each power module.

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