Portable single-phase-to-three-phase electrical control power supply device

Abstract

The utility model relates to the field of single-phase-to-three-phase power supplies, in particular to a portable single-phase-to-three-phase electrical control power supply device, which comprises a two-pole single-phase circuit breaker, a frequency converter, a three-phase autotransformer, a single-phase transformer, a two-pole circuit breaker and a three-pole circuit breaker, the input end of the two-pole single-phase circuit breaker is connected with an external alternating-current power source, the output end of the two-pole single-phase circuit breaker is connected with the input end of the frequency converter, the output end of the two-pole single-phase circuit breaker is further connected with the input end of the single-phase transformer, and the output end of the frequency converter is connected with the input end of the three-phase autotransformer. The output end of the three-phase autotransformer is connected with the input end of the three-pole circuit breaker, the output end of the three-pole circuit breaker is connected with the three-phase asynchronous motor, the output end of the single-phase transformer is connected with the input end of the two-pole circuit breaker, and the output end of the two-pole circuit breaker is connected with the control circuit. The device is small in size and convenient to install, and the cost is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of single-phase to three-phase power supply, specifically to a portable single-phase to three-phase electrical control power supply device. Background Technology

[0002] In remote areas or office areas where three-phase power supply is unavailable, it is necessary to convert single-phase electricity to three-phase power. Existing technology, such as CN107769586A, discloses a single-phase to three-phase converter power supply, comprising: a first multi-level converter module, a second multi-level converter module, and a high-frequency transformer isolation module. The input terminal of the first multi-level converter module is used to connect to single-phase AC power. The output terminal of the first multi-level converter module is connected to the input terminal of the second multi-level converter module through the high-frequency transformer isolation module. The output terminal of the second multi-level converter module is used to output three-phase AC power. The first multi-level converter module converts the single-phase AC power to DC power. The second multi-level converter module converts the DC power output from the high-frequency transformer isolation module into three-phase AC power.

[0003] This solution achieves both high-voltage input and high-voltage output, but its structure is complex and its cost is high. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a portable single-phase to three-phase electrical control power supply device, which has a simple structure, low cost and is easy to install.

[0005] This utility model achieves the above objectives by adopting the following technical solution: This utility model provides a portable single-phase to three-phase electrical control power supply device, including a two-pole single-phase circuit breaker QF1, a frequency converter, a three-phase autotransformer T1, a single-phase transformer T2, a two-pole circuit breaker QF2, and a three-pole circuit breaker QF3. The two-pole circuit breaker QF2 and the three-pole circuit breaker QF3 are coaxially connected in a five-gang configuration. The input terminals of the two-pole single-phase circuit breaker QF1 are respectively connected to the live wire and neutral wire of an external AC power supply. The output terminals of the two-pole single-phase circuit breaker QF1... The output terminals are connected to the input terminals of the frequency converter. The output terminal of the two-pole single-phase circuit breaker QF1 is also connected to the input terminal of the single-phase transformer T2. The three output terminals of the frequency converter are respectively connected to the input terminals of the three-phase autotransformer T1. The output terminal of the three-phase autotransformer T1 is connected to the input terminal of the three-pole circuit breaker QF3. The output terminal of the three-pole circuit breaker QF3 is connected to the three-phase asynchronous motor. The output terminal of the single-phase transformer T2 is connected to the input terminal of the two-pole circuit breaker QF2. The output terminal of the two-pole circuit breaker QF2 is connected to the control circuit.

[0006] The beneficial effects of this utility model are:

[0007] This utility model achieves the conversion of single-phase electricity to three-phase electricity using only a single two-pole single-phase circuit breaker QF1, a frequency converter, a three-phase autotransformer T1, a single-phase transformer T2, a five-gang coaxial two-pole circuit breaker QF2, and a three-pole circuit breaker QF3. It is small in size, low in cost, easy to install, and greatly reduces costs. Attached Figure Description

[0008] Figure 1 This is a circuit diagram of a portable single-phase to three-phase electrical control power supply device provided in an embodiment of this utility model. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0010] This utility model provides a portable single-phase to three-phase electrical control power supply device, such as... Figure 1 As shown, the system includes a two-pole single-phase circuit breaker QF1, a frequency converter, a three-phase autotransformer T1, a single-phase transformer T2, a two-pole circuit breaker QF2, and a three-pole circuit breaker QF3. The two-pole circuit breaker QF2 and the three-pole circuit breaker QF3 are connected in a five-gang coaxial configuration. The input terminals of the two-pole single-phase circuit breaker QF1 are connected to the live wire and neutral wire of the external AC power supply, respectively. The output terminals of the two-pole single-phase circuit breaker QF1 are connected to the input terminals of the frequency converter and also to the input terminals of the single-phase transformer T2. The three output terminals of the frequency converter are connected to the input terminals of the three-phase autotransformer T1, respectively. The output terminals of the three-phase autotransformer T1 are connected to the input terminals of the three-pole circuit breaker QF3. The output terminals of the three-pole circuit breaker QF3 are connected to a three-phase asynchronous motor. The output terminals of the single-phase transformer T2 are connected to the input terminals of the two-pole circuit breaker QF2, and the output terminals of the two-pole circuit breaker QF2 are connected to the control circuit.

[0011] This utility model provides 220V AC voltage to a single-phase to three-phase electrical control power supply device through a two-pole single-phase circuit breaker QF1.

[0012] This invention provides a 220V three-phase balanced and stable AC power supply to the main circuit of the electrical control circuit through a frequency converter.

[0013] This invention provides a three-phase balanced and stable AC power supply of 36V to 220V for the primary electrical control circuit through a three-phase autotransformer T1.

[0014] This invention provides a 21V to 220V single-phase AC power supply to the electrical control secondary circuit through a single-phase transformer T2.

[0015] This utility model uses a coaxial five-gang two-pole circuit breaker QF2 and a three-pole circuit breaker QF3. When the main circuit AC line voltage of 36V and the control circuit phase voltage of 21V are normal, closing the coaxial five-gang two-pole circuit breaker QF2 and the three-pole circuit breaker QF3 ensures that the main circuit and control circuit of the electrical control circuit are powered simultaneously.

[0016] The portable single-phase to three-phase electrical control power supply device provided by this utility model is small in size, low in cost, and easy to install, which greatly reduces costs.

[0017] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A portable single-to-three-phase electrical control power supply device, characterized by, It comprises two-pole single-phase circuit breaker (QF1), frequency converter, three-phase autotransformer (T1), single-phase transformer (T2), two-pole circuit breaker (QF2) and three-pole circuit breaker (QF3), the two-pole circuit breaker (QF2) and the three-pole circuit breaker (QF3) are coaxial five-connection, the input end of the two-pole single-phase circuit breaker (QF1) is connected with the fire line end and the zero line end of external AC power source respectively, the output end of the two-pole single-phase circuit breaker (QF1) is connected with the input end of the frequency converter, the output end of the two-pole single-phase circuit breaker (QF1) is also connected with the input end of the single-phase transformer (T2), the three output ends of the frequency converter are connected with the input end of the three-phase autotransformer (T1) respectively, the output end of the three-phase autotransformer (T1) is connected with the input end of the three-pole circuit breaker (QF3), the output end of the three-pole circuit breaker (QF3) is connected with three-phase asynchronous motor, the output end of the single-phase transformer (T2) is connected with the input end of the two-pole circuit breaker (QF2), the output end of the two-pole circuit breaker (QF2) is connected with control circuit.

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