Shared power supply device for converting single-phase power into three-phase power

Abstract

The utility model relates to a shared power supply device for converting single-phase electricity into three-phase electricity, which comprises a single-phase air switch, an electricity meter, a controllable switching device, a frequency converter and a three-phase air switch which are sequentially connected, and further comprises a control and communication module, and the electricity meter, the controllable switching device and the frequency converter are respectively and electrically connected with the control and communication module. The single-phase air switch is normally open and is used for cutting off external single-phase power supply input in an abnormal state; the ammeter is used for counting electric quantity flowing through the device; the controllable switching device is used for controlling the single-phase power input frequency converter; the frequency converter is used for converting single-phase power into three-phase power; the three-phase air switch is normally open and is used for cutting off three-phase power output in an abnormal state; and the control and communication module is used for realizing wireless communication with external equipment to obtain a working instruction, and controlling the controllable switching device and the frequency converter to operate according to the working instruction. The device can meet the shared power utilization requirement that a single-phase power user temporarily uses three-phase power, and the cost of additionally arranging a three-phase power supply is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of power management, and particularly relates to a shared power supply device for converting single-phase electricity into three-phase electricity. Background Art

[0002] The rural electricity demand is basically single-phase 220V, and only single-phase power lines are configured for the transmission lines. With the rapid development of rural agriculture, there are many single-phase line users who need to use three-phase motors. For example, well irrigation and agricultural production all require three-phase motors. However, the cost of configuring three-phase electricity for each household alone is relatively high and the cycle is relatively long. Pulling wires, burying electric poles, replacing three-phase electric meters, etc. involve various aspects and are relatively complex and cumbersome.

[0003] Therefore, it is necessary to design a shared power supply device for converting single-phase electricity into three-phase electricity to meet the demand of single-phase electricity users for temporarily using three-phase electricity. Summary of the Utility Model

[0004] Based on the above description, the utility model provides a shared power supply device for converting single-phase electricity into three-phase electricity to meet the shared electricity demand of single-phase electricity users for temporarily using three-phase electricity.

[0005] The technical solution for the utility model to solve the above technical problems is as follows: A shared power supply device for converting single-phase electricity into three-phase electricity includes a single-phase air switch, an electric meter, a controllable switch device, an inverter, and a three-phase air switch connected in sequence, and further includes a control and communication module. The electric meter, the controllable switch device, and the inverter are respectively electrically connected to the control and communication module;

[0006] The single-phase air switch is normally open and is used to cut off the external single-phase power input in an abnormal state;

[0007] The electric meter is used to count the electricity quantity flowing through this device;

[0008] The controllable switch device is used to control the single-phase electricity to input into the inverter;

[0009] The inverter is used to convert single-phase electricity into three-phase electricity;

[0010] The three-phase air switch is normally open and is used to cut off the three-phase electricity output in an abnormal state;

[0011] The control and communication module is used to achieve wireless communication with external devices to obtain work instructions, and control the operation of the controllable switch device and the inverter according to the work instructions.

[0012] Based on the above technical solution, the utility model can also be improved as follows.

[0013] Preferably, the control and communication module includes a switching power supply, a control module, a gateway, a first relay, and a second relay;

[0014] The input end of the switching power supply is connected to the output end of the electric meter, and is used to provide working power for the control module, the gateway, the first relay, and the second relay;

[0015] The gateway is communicatively connected to the control module and is used to achieve wireless communication with external devices, so as to report the identity information and power consumption information of this device and receive working instructions;

[0016] The control module is respectively controllably connected to the control end of the first relay and the control end of the second relay, and is used to control the first relay and / or the second relay to act according to the working instructions;

[0017] The switch channel of the first relay is connected to the control end of the controllable switch device and is used to control the controllable switch device to act;

[0018] The switch channel of the second relay is connected to the control end of the frequency converter and is used to control the operation of the frequency converter.

[0019] Preferably, the device further includes a housing, and a single-phase power input port and a three-phase power output port are provided on the housing. The single-phase power input port is electrically connected to the single-phase input end of the single-phase air switch, and the three-phase power output port is electrically connected to the three-phase output end of the three-phase air switch.

[0020] Preferably, a concave area is provided at the bottom end of the housing, and the single-phase power input port and the three-phase power output port are integrally arranged in the concave area.

[0021] Preferably, the single-phase power input port and the three-phase power output port are respectively provided with an aviation socket / aviation plug.

[0022] Preferably, the device further includes a display module. The display module penetrates through the housing and is communicatively connected to the frequency converter, and is used to display the electrical parameters and / or working status of the frequency converter in real time.

[0023] Preferably, the device further includes an identity recognition module. The identity recognition module is arranged on the housing, and the identity recognition module is used to provide the identity information of this device.

[0024] Preferably, a water-blocking cap is provided at the upper end of the housing, and the water-blocking cap is arranged with a narrower upper part and a wider lower part.

[0025] Preferably, a plurality of horizontally arranged strip-shaped heat dissipation openings are provided on the side surface of the housing. The opening direction of the strip-shaped heat dissipation openings is inclined downward, and a water-blocking strip is arranged on the upper edge of the strip-shaped heat dissipation openings.

[0026] Preferably, a maintenance door that can be opened is provided on the housing.

[0027] Compared with the prior art, the technical solution of the present application has the following beneficial technical effects: A shared power supply device for converting single-phase electricity to three-phase electricity provided by the present utility model obtains the power usage permission through wireless communication between the control and communication module and a remote device, controls the controllable switch device to open the power usage channel, and the frequency converter converts single-phase commercial power into three-phase electricity to provide three-phase power for users. At the same time, the electricity consumption is measured by an electricity meter, and the electricity consumption can be reported through wireless communication between the control and communication module and the remote device, and combined with the mobile terminal APP to achieve electricity charging and settlement. The device of the present utility model realizes the sharing of three-phase power, meets the three-phase power usage requirements of users in certain scenarios, achieves shared and automated safe power usage, and solves the problem that three-phase electricity is lacking in some areas and the cost of separately adding three-phase electricity is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the working principle of a shared power supply device for converting single-phase electricity to three-phase electricity provided by an embodiment of the present utility model;

[0029] Figure 2 It is a wiring schematic diagram of a shared power supply device for converting single-phase electricity to three-phase electricity provided by an embodiment of the present utility model;

[0030] Figure 3 It is a schematic diagram of the structure of a shared power supply device for converting single-phase electricity to three-phase electricity provided by an embodiment of the present utility model from a certain perspective;

[0031] Figure 4 It is a schematic diagram of the structure of a shared power supply device for converting single-phase electricity to three-phase electricity provided by an embodiment of the present utility model from another perspective.

[0032] In the drawings, the list of components represented by each reference numeral is as follows:

[0033] 1. Control and communication module, 2. Housing, 201. Single-phase power inlet port, 202. Three-phase power outlet port, 203. Display module, 204. Identity recognition module, 205. Water baffle cap, 206. Strip-shaped heat dissipation port, 2061. Water baffle strip, 207. Maintenance door, 208. Lock, 209. Indicator light;

[0034] a. Concave area, QF1. Single-phase air switch, QF2. Three-phase air switch, PJ. Electricity meter, KM. Controllable switch device, VFD. Frequency converter, KA1. First relay, KA2. Second relay, MCU. Control module, GW. Gateway, SMPS. Switching power supply. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant accompanying drawings. Embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0037] It can be understood that spatial relationship terms such as "under", "below", "beneath", "underneath", "above", "over" etc. can be used herein to describe the relationship of one element or feature shown in the figure with other elements or features. It should be understood that in addition to the orientation shown in the figure, spatial relationship terms also include different orientations of the device during use and operation. For example, if the device in the figure is flipped, the element or feature described as "under other elements" or "beneath it" or "under it" will be oriented "above" other elements or features. Therefore, the exemplary terms "under" and "beneath" can include both the upper and lower orientations. In addition, the device can also include other orientations (such as rotating 90 degrees or other orientations), and the spatial descriptions used herein are accordingly interpreted.

[0038] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection", if there is an electrical signal or data transmission between the connected circuits, modules, units, etc., should be understood as "electrically connected", "communicatively connected", etc.

[0039] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprise / include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0040] Please refer to Figure 1 and Figure 2 , Figure 1 shows the working principle of a shared power supply device for converting single-phase electricity into three-phase electricity in a certain embodiment. Figure 2It shows the wiring principle of a shared power supply device for converting single-phase electricity into three-phase electricity in another embodiment.

[0041] As Figure 1 shown, a shared power supply device for converting single-phase electricity into three-phase electricity provided in this embodiment includes a single-phase air switch QF1, an electricity meter PJ, a controllable switch device KM, a frequency converter VFD, and a three-phase air switch QF2 that are electrically connected in sequence. It also includes a control and communication module 1. The electricity meter PJ, the controllable switch device KM, and the frequency converter VFD are respectively electrically connected to the control and communication module 1;

[0042] The single-phase air switch QF1 is in an open state during normal operation. It provides an input channel for the external single-phase power supply under normal conditions and cuts off the external single-phase power input under abnormal conditions, such as overload, short circuit, etc., thereby providing protection for the device;

[0043] The electricity meter PJ is used to count the electricity consumed by this device. Based on the counted electricity, the electricity fee to be paid for this use can be calculated in combination with the current electricity price;

[0044] The controllable switch device KM is used to control the input of single-phase electricity to the frequency converter VFD; the controllable switch device KM needs to have strong overload capacity and can be implemented by using Figure 1 to Figure 2 the contactor shown;

[0045] The frequency converter VFD is used to convert single-phase electricity into three-phase electricity; the frequency converter VFD sequentially rectifies, reduces noise, and inverts the input single-phase commercial power to obtain frequency-modulated or non-frequency-modulated three-phase electricity;

[0046] Similar to the principle of the aforementioned single-phase air switch QF1, the three-phase air switch QF2 is in an open state during normal operation. It provides an output channel for three-phase electricity under normal conditions and is used to cut off the three-phase electricity output under abnormal conditions; cutting off the three-phase electricity output under abnormal conditions, such as overload, short circuit, etc., thereby providing protection for the subsequent power consumption circuit;

[0047] The control and communication module 1 is used to achieve wireless communication with external devices to obtain work instructions, can also report the electricity quantity monitored by the electricity meter PJ, and control the operation of the controllable switch device KM and the frequency converter VFD according to the work instructions.

[0048] It can be understood that during the normal operation of this device, wireless communication with a remote device is carried out through the control and communication module 1 to obtain the power usage permission, so as to control the controllable switch device KM to open the power usage channel. The frequency converter VFD converts single-phase mains power into three-phase power to provide a three-phase power supply for users. At the same time, the electricity consumption is measured by the electricity meter PJ, and the electricity consumption can be reported through the wireless communication between the control and communication module 1 and the remote device, combined with the mobile terminal APP to achieve electricity charging and settlement. Overload and short-circuit protection of the device are realized through the single-phase air switch QF1 and the three-phase air switch QF2 to improve the safety of the device. The device of the present utility model realizes the sharing of three-phase power, meets the three-phase power usage needs of users in certain scenarios, achieves shared and automated safe power usage, and solves the problem that there is a lack of three-phase power in some areas and the cost of separately adding three-phase power is relatively high.

[0049] On the basis of the above embodiments, the following improvements can be made to this embodiment.

[0050] As Figure 2 shown, the control and communication module 1 includes a switching power supply SMPS, a control module MCU, a gateway GW, a first relay KA1, and a second relay KA2;

[0051] The input end of the switching power supply SMPS is connected to the output end of the electricity meter PJ, and is used to provide working power for the control module MCU, the gateway GW, the first relay KA1, and the second relay KA2;

[0052] The gateway GW is communicatively connected to the control module MCU and is used to achieve wireless communication with external devices to report the identity information and power consumption information of this device and receive working instructions;

[0053] The control module MCU is respectively controllably connected to the control end of the first relay KA1 and the control end of the second relay KA2, and is used to control the first relay KA1 and / or the second relay KA2 to act according to the working instructions;

[0054] The switching channel of the first relay KA1 is connected to the control end of the controllable switch device KM and is used to control the controllable switch device KM to act;

[0055] The switching channel of the second relay KA2 is connected to the control end of the frequency converter VFD and is used to control the operation of the frequency converter VFD.

[0056] It can be understood that in this embodiment, the switching power supply SMPS obtains power from the output end of the electricity meter PJ, and the consumed electric energy is included in the electric energy counted by the electricity meter PJ, making the electric energy data more accurate.

[0057] The gateway GW is connected to the remote device through wireless communication to achieve information interaction with the remote end. At the same time, it can transmit the work instructions sent by the remote device to the control module MCU. When the execution conditions are met, the control module MCU controls the operation of this device according to the work instructions.

[0058] The control module MCU controls the first relay KA1 and the second relay KA2. The first relay KA1 and the second relay KA2 respectively control the operation of the controllable switch device KM (contactor) and the frequency converter VFD, achieving the effect of controlling strong electricity with weak electricity. At the same time, it prevents the large current in the strong electricity circuit from causing accidental damage to the control module MCU.

[0059] Such as Figure 3 and Figure 4 As shown, the device further includes a housing 2. The housing 2 is provided with a single-phase power input port 201 and a three-phase power output port 202. The single-phase power input port 201 is electrically connected to the single-phase input end of the single-phase air switch QF1, and the three-phase power output port 202 is electrically connected to the three-phase output end of the three-phase air switch QF2. The housing 2 is also provided with an installation structure that is convenient for disassembly and assembly.

[0060] It can be understood that the setting of the housing 2 enriches the usage scenarios of the device, making the device more suitable for outdoor use. At the same time, it improves the safety during the operation of the device and enhances the IP protection level of the device. Through the housing 2, this device can be set as a portable device. For example, installation structures such as hoop and mounting plate are set on the housing 2, so as to realize the flexible installation and disassembly of the device. In the situation of having a network and a single-phase power supply with appropriate parameters, the three-phase power can be flexibly converted to meet the usage requirements and improve the applicability of the device.

[0061] Such as Figure 4 As shown, an inward concave area a is provided at the bottom end of the housing 2. The single-phase power input port 201 and the three-phase power output port 202 are integrally arranged in the inward concave area a. By setting an inward concave area a that is recessed towards the inside of the device at the bottom end of the device housing 2, when there is water flow on the surface of the housing 2, due to the action of gravity, the water flow will not flow into the inward concave area a, thus avoiding the short circuit caused by the single-phase power input port 201 and the three-phase power output port 202 contacting the water flow, improving the overall waterproof performance of the device and enhancing the safety of the device.

[0062] Furthermore, in order to facilitate the connection between this device and external devices, this device is connected to external devices in a plug / socket plug-and-play manner. The single-phase power input port 201 and the three-phase power output port 202 are respectively provided with aviation sockets / aviation plugs. Aviation sockets / aviation plugs have strong overload capacity and relatively high overall safety performance, and can be used as preferred plugs / sockets.

[0063] Such as Figure 3and Figure 4 As shown in Figure 4 , the device further includes a display module 203. The display module 203 penetrates through the housing 2, and the display module 203 is communicatively connected to the frequency converter VFD, and is configured to, in the working state, display in real time the electrical parameters and / or the working state of the frequency converter VFD, so as to detect in time whether the frequency converter VFD is abnormal.

[0064] As Figure 3 and Figure 4 As shown in Figure 4 , the device further includes an identity recognition module 204. The identity recognition module 204 is disposed on the housing 2, and the identity recognition module 204 is configured to provide the identity information of the device. The identity recognition module 204 may adopt an identity recognition code (such as a bar code or a two-dimensional code, etc.) disposed on the surface of the housing 2, and the identity recognition code is verified through an APP pre-downloaded on a mobile terminal carried by a user. At the same time, the identity recognition code is reported to a remote device to unlock the device, and the remote device sends an unlocking instruction and a working instruction to the gateway GW, and then the device can start normal power supply.

[0065] As another implementation manner, the identity recognition module 204 may also adopt an information input module for the user to input, such as a touch screen or a key array, for the user to manually input a user ID and a password to unlock the three-phase power supply function of the current device.

[0066] As Figure 3 and Figure 4 As shown in Figure 4 , a water baffle cap 205 is disposed at the upper end of the housing 2, and the water baffle cap 205 is arranged with a narrow upper part and a wide lower part. When used in an outdoor scenario, in principle, the device is used in a weather without rain or snow. However, during the use process, sudden bad weather may be encountered, such as rain. In such a case, the water baffle cap 205 at the upper end of the housing 2 can divert rainwater, so that the rainwater flows down along the upper inclined surface of the water baffle cap 205, avoiding water flowing into the device and causing a short circuit.

[0067] As Figure 3 and Figure 4 As shown in Figure 4 , a plurality of horizontally arranged strip-shaped heat dissipation openings 206 are disposed on the side surface of the housing 2. The opening direction of the strip-shaped heat dissipation openings 206 is inclined downward, and a water baffle strip 2061 is disposed at the upper edge of the strip-shaped heat dissipation openings 206.

[0068] Since the frequency converter VFD generates heat during operation, through the plurality of horizontally arranged strip-shaped heat dissipation openings 206, air convection inside the device can be realized for heat dissipation. And the strip-shaped heat dissipation openings 206 are inclined downward in the opening direction, which can prevent water from flowing into the device and causing a short circuit while ensuring the air circulation effect.

[0069] As Figure 3 and Figure 4As shown, a maintenance door 207 that can be opened is provided on the housing 2. During normal operation, the maintenance door 207 is locked by a latch 208 or other locking mechanisms. During the process of repairing or regularly maintaining the device, maintenance personnel can open the housing 2 through the maintenance door 207.

[0070] In order to indicate the working state of the device in real time, an indicator light 209 can also be set on the housing 2. The indicator light 209 is connected to the output end of the single-phase air switch QF1 and can indicate the power input situation of the device. The indicator light 209 can also be connected to the control module MCU to indicate whether the working state of the device is abnormal.

[0071] Now, a specific implementation scenario is used as an example for illustration.

[0072] In this implementation scenario, the gateway GW uses a 4G IoT gateway module, and the electricity meter PJ uses a rail-mounted electricity meter. This device is built by a single-phase air switch QF1, a rail-mounted electricity meter PJ, a contactor, a frequency converter VFD, a three-phase air switch QF2, and other electrical control and protection devices. It is a single-phase to three-phase power conversion device that can be used for shared electricity consumption, temporary electricity consumption, and mobile electricity consumption. This device can real-time monitor voltage, current, and electricity consumption, and after reading the data of the electricity meter PJ through the 4G IoT gateway module, it uploads the data to the power grid background in real time through 4G signals, and also uploads it to the user's mobile phone in real time to achieve real-time billing and settlement. This device also adopts the unique SPWM voltage regulation and frequency modulation technology, PID control technology, and related electrical protection technologies of the frequency converter VFD, and achieves the automatic switching function through electrical devices such as the first relay KA1, the second relay KA2, the contactor, and the air switch. At the same time, it has multiple protection functions such as overvoltage, overcurrent, and undervoltage to meet real-time, accurate, and reliable voltage regulation and frequency modulation, and can realize the soft start of the motor in the subsequent power consumption circuit, achieving stable output, smooth and flexible start, and achieving the effects of protecting the motor and reducing the impact on the power grid, and safely and reliably realizing the single-phase to three-phase power conversion technology.

[0073] This device is equipped with an IoT module and has a 4G communication method. It transmits the parameters of the electricity meter PJ inside the device to the background in real time. It can be settled by scanning the code for payment through a pre-downloaded APP (such as the "State Grid Online APP") according to the actual electricity consumption. It realizes time-sharing sharing, and whoever scans the code can use it. One device can replace multiple power-taking devices, avoiding resource waste. This device achieves shared and automated safe electricity use, and also solves the problem that in some areas, the lack of three-phase electricity leads to high costs when a three-phase electricity device is added separately.

[0074] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A shared power supply device for converting single-phase electricity into three-phase electricity, characterized in that: It comprises a single-phase air switch (QF1), an electric meter (PJ), a controllable switch device (KM), a frequency converter (VFD) and a three-phase air switch (QF2) connected in sequence, and also comprises a control and communication module (1), wherein the electric meter (PJ), the controllable switch device (KM) and the frequency converter (VFD) are electrically connected to the control and communication module (1) respectively; The single-phase air switch (QF1) is normally open and is used to cut off the external single-phase power input in an abnormal state; The electric meter (PJ) is used to count the amount of electricity flowing through the device; The controllable switch device (KM) is used to control the single-phase power input to the frequency converter (VFD); The variable frequency drive (VFD) is used to convert single-phase electricity into three-phase electricity; The three-phase air switch (QF2) is normally open and is used to cut off the three-phase power output in an abnormal state; The control and communication module (1) is used to realize wireless communication with external equipment to obtain working instructions, and control the operation of the controllable switch device (KM) and the frequency converter (VFD) according to the working instructions.

2. A shared power supply device for converting single-phase electricity into three-phase electricity according to claim 1, characterized in that: The control and communication module (1) comprises a switching power supply (SMPS), a control module (MCU), a gateway (GW), a first relay (KA1) and a second relay (KA2); The input end of the switching power supply (SMPS) is connected to the output end of the electric meter PJ, and is used to provide working power for the control module (MCU), the gateway (GW), the first relay (KA1) and the second relay (KA2); The gateway (GW) is in communication connection with the control module (MCU) and is used to realize wireless communication with external devices to report the identity information and power information of the device and receive work instructions; The control module (MCU) is respectively connected to a control end of the first relay (KA1) and a control end of the second relay (KA2), and is used to control the action of the first relay (KA1) and / or the second relay (KA2) according to the working instruction; The switch channel of the first relay (KA1) is connected to the control end of the controllable switch device (KM) for controlling the action of the controllable switch device (KM); The switch channel of the second relay (KA2) is connected to the control end of the frequency converter (VFD) and is used to control the operation of the frequency converter (VFD).

3. A shared power supply device for converting single-phase electricity into three-phase electricity according to claim 1 or 2, characterized in that: It also includes a shell (2), on which a single-phase power input port (201) and a three-phase power output port (202) are provided, the single-phase power input port (201) is electrically connected to the single-phase input end of the single-phase air switch (QF1), and the three-phase power output port (202) is electrically connected to the three-phase output end of the three-phase air switch (QF2).

4. A shared power supply device for converting single-phase electricity into three-phase electricity according to claim 3, characterized in that: The bottom end of the housing (2) is provided with a concave area (a), and the single-phase power input port (201) and the three-phase power output port (202) are integrated in the concave area (a).

5. A shared power supply device for converting single-phase electricity into three-phase electricity according to claim 4, characterized in that: The single-phase power input port (201) and the three-phase power output port (202) are respectively provided with aviation sockets / aviation plugs.

6. A shared power supply device for converting single-phase electricity into three-phase electricity according to claim 3, characterized in that: It also includes a display module (203), which is arranged throughout the housing (2) and is communicatively connected to the frequency converter (VFD) for displaying electrical parameters and / or working status of the frequency converter (VFD) in real time.

7. A shared power supply device for converting single-phase electricity into three-phase electricity according to claim 3, characterized in that: It also comprises an identity recognition module (204), which is arranged on the housing (2) and is used to provide identity information of the device.

8. A shared power supply device for converting single-phase electricity into three-phase electricity according to claim 3, characterized in that: A water retaining cap (205) is provided at the upper end of the outer shell (2), and the water retaining cap (205) is narrow at the top and wide at the bottom.

9. A shared power supply device for converting single-phase electricity into three-phase electricity according to claim 3, characterized in that: The side surface of the housing (2) is provided with a plurality of transversely arranged strip-shaped heat dissipation openings (206); the opening direction of the strip-shaped heat dissipation openings (206) is arranged to be inclined downward, and a water retaining strip (2061) is provided on the upper edge of the strip-shaped heat dissipation openings (206).

10. A shared power supply device for converting single-phase electricity into three-phase electricity according to claim 3, characterized in that: The housing (2) is provided with an openable maintenance door (207).

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