A single-phase balanced power supply system based on three-phase transformer

Abstract

The present invention discloses a single-phase balanced power supply system based on a three-phase transformer, including a power grid connected to a transformer via a three-phase high-voltage line; the transformer includes three iron cores, a three-phase high-voltage winding and three single-phase low-voltage windings, the three-phase high-voltage windings are respectively connected to the three-phase high-voltage line, each iron core is respectively connected to one of the three-phase high-voltage windings and a single-phase low-voltage winding; the fixed output ends of the three single-phase low-voltage windings are all connected to an output circuit; the output circuit includes a connected AC / DC unit and a rectifier filter circuit, the fixed output ends of the three single-phase low-voltage windings are all connected to an AC / DC unit, and the AC / DC unit is connected to a load via a rectifier filter circuit; a movable slide, an input end is connected to the single-phase low-voltage winding, and an output end thereof is connected to a single-chip circuit; the input end of the single-chip circuit is connected to the output end of the movable slide, and the output end of the single-chip circuit is connected to the output circuit. The present invention can adjust the output of each phase of the transformer according to load demand, reducing resource waste.

Description

Technical Field

[0001] The present invention relates to the field of power supply circuits, and in particular to a single-phase balanced power supply system based on a three-phase transformer. Background Art

[0002] At present, when the grid phase load is too much, the power quality will decline and cannot meet the power demand of users. Sometimes it is necessary to compensate the three phases to achieve balance and meet the power demand of users. Most existing solutions use three-phase transformers for compensation. The three phases must be adjusted uniformly and can only be increased or decreased synchronously. The three phases can only be compensated uniformly and single-phase independent compensation cannot be performed. There may be over-compensation or under-compensation, which cannot meet the actual power demand for adjustment, resulting in a waste of resources. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a single-phase balanced power supply system based on a three-phase transformer, provide multiple output modes, and adjust the output of each phase of the transformer according to load requirements, so that the output adjustment is more flexible and reduce resource waste.

[0004] The purpose of the present invention is achieved by the following technical solutions:

[0005] A single-phase balanced power supply system based on a three-phase transformer, comprising:

[0006] A power grid, wherein the power grid is connected to a transformer via a three-phase high-voltage line;

[0007] A transformer, comprising three iron cores, a three-phase high-voltage winding and three single-phase low-voltage windings, wherein the three-phase high-voltage windings are respectively connected to the three-phase high-voltage lines, and each of the iron cores is respectively connected to one of the three-phase high-voltage windings and one of the single-phase low-voltage windings; the fixed output ends of the three single-phase low-voltage windings are all connected to an output circuit;

[0008] An output circuit, comprising a connected AC / DC unit and a rectifier filter circuit, wherein the fixed output ends of the three single-phase low-voltage windings are all connected to the AC / DC unit, and the AC / DC unit is connected to a load via the rectifier filter circuit;

[0009] A movable slider, wherein the input end of the movable slider is connected to the single-phase low-voltage winding, and the output end of the movable slider is connected to a single-chip microcomputer circuit;

[0010] A single chip microcomputer circuit, wherein the input end of the single chip microcomputer circuit is connected to the output end of one or three of the moving slides, and the output end of the single chip microcomputer circuit is connected to the output circuit.

[0011] Furthermore, the number of turns of the three single-phase low-voltage windings is different, and the number of turns of the three single-phase low-voltage windings is based on the number of turns of one of the single-phase low-voltage windings, and the number of turns of the other two single-phase low-voltage windings increases or decreases according to a set ratio of the reference number.

[0012] Furthermore, the number of the movable slider is set to one, and the movable slider is connected to the single-phase low-voltage winding with the least number of turns.

[0013] Furthermore, the number of the movable slides is set to three, the three movable slides are respectively connected to the three single-phase low-voltage windings, and the output ends of the three movable slides are all connected to the input end of the single-chip microcomputer circuit.

[0014] Furthermore, the three single-phase low-voltage windings have the same number of turns, and the three single-phase low-voltage windings are respectively connected to corresponding movable slides, and the output ends of the three movable slides are all connected to the input end of the single-chip microcomputer circuit.

[0015] Furthermore, the output circuit also includes a smart meter, and the smart meter is used to collect power consumption parameters of each load.

[0016] Furthermore, the single chip microcomputer circuit is provided with a wireless communication module, and the single chip microcomputer circuit is connected to the smart meter signal through the wireless communication module.

[0017] Furthermore, the single chip microcomputer circuit is bidirectionally connected to a human-computer interaction module.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The transformer has three single-phase low-voltage windings, which enables the transformer to perform single-phase independent compensation according to load requirements. At the same time, the output of the single-phase low-voltage winding can be further adjusted by moving the slider, making the output of the power supply system more flexible and reducing resource waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] In the figure: 1. Power grid; 2. Three-phase transformer; 3. Moving slider; 4. Single chip microcomputer circuit; 5. AC / DC unit; 6. Rectification and filtering circuit. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0023] A single-phase balanced power supply system based on a three-phase transformer 2 can provide a variety of power supply output modes according to user load requirements, thereby improving the flexibility of compensation adjustment and reducing resource waste.

[0024] Reference Figure 1 As shown, the power supply system includes a three-phase transformer 2, a movable slider 3, a single-chip computer circuit 4 and an output circuit. The power supply system is connected to a power grid 1, and the power grid 1 can input AC power to the power supply system, and the AC power is high-voltage AC power; the power grid 1 is connected to three-phase high-voltage lines, namely phase A, phase B and phase C, and the three-phase high-voltage lines A, B, and C are all connected to the transformer.

[0025] The transformer is a three-phase transformer 2, which includes three iron cores, three-phase high-voltage windings and three single-phase low-voltage windings; in order to reduce eddy current and hysteresis losses, the iron core is made of silicon steel sheets with high magnetic permeability, relative insulation, and a thickness of 0.35-0.5 mm. The three-phase high-voltage windings are group A, group B and group C respectively, and the three groups of high-voltage windings A, B and C are connected to the power grid 1 through three-phase high-voltage lines A, B and C respectively; and each of the iron cores is respectively connected to one phase of the high-voltage winding and one of the single-phase low-voltage windings in the three-phase high-voltage windings; the three single-phase low-voltage windings are respectively provided with corresponding fixed output terminals, and the three single-phase low-voltage windings are all grounded through a common terminal, and the three single-phase low-voltage windings are respectively connected to output circuits through their respective fixed output terminals, and are respectively connected to three different loads A, B and C after the output circuits.

[0026] In this embodiment, the A line, B line and C line are connected to the power grid 1, the A line is connected to the A-phase high-voltage winding via an inductor and a capacitor, the B line is connected to the B-phase high-voltage winding via an inductor and a capacitor, and the C line is connected to the C-phase high-voltage winding via an inductor and an inductor, wherein the A-phase high-voltage winding, the B-phase high-voltage winding and the C-phase high-voltage winding are all connected to the iron core, and corresponding single-phase low-voltage windings are respectively wound on the other end of the iron core, and the A, B, and C loads are respectively connected through three single-phase low-voltage windings.

[0027] Among them, the output circuit includes a connected AC / DC unit 5 and a rectifier and filter circuit 6. The fixed output ends of the three single-phase low-voltage windings are all connected to the AC / DC unit 5. The AC / DC unit 5 is used to convert the high-voltage alternating current of the mains into direct current for direct use by the load; the AC / DC unit 5 is connected to the load via the rectifier and filter circuit 6. The rectifier and filter circuit 6 can filter the output current to make the output current more stable.

[0028] In this embodiment, the number of turns of the three single-phase low-voltage windings is set to be different, and the number of turns of the three single-phase low-voltage windings is based on the number of turns of one of the single-phase low-voltage windings, and the number of turns of the other two single-phase low-voltage windings increases or decreases according to the set ratio of the reference number. For example, if the number of turns of the single-phase low-voltage winding connected to the B load is a set value, the number of turns of the single-phase low-voltage winding connected to the A load is increased by a set percentage compared with the number of turns of the single-phase low-voltage winding connected to the B load, and the number of turns of the single-phase low-voltage winding connected to the C load is reduced by a set percentage compared with the number of turns of the single-phase low-voltage winding connected to the B load. Since the number of turns of the three single-phase low-voltage windings is different, loads with different power requirements can be connected to different output terminals, thereby providing different output voltages for different loads, and compensation is performed according to the actual needs of the load to avoid wasting resources.

[0029] The number of turns of the three single-phase low-voltage windings is different and is designed according to a certain ratio. Although the three output voltages of the transformer are different, since the number of turns of the three single-phase low-voltage windings is fixed when the equipment leaves the factory, the three output voltages of the transformer are also unchanged. Therefore, in order to allow the output voltage of the transformer to have more adjustment possibilities and avoid the output voltage of the transformer being simply affected by the number of turns, a movable slider 3 is connected to the single-phase low-voltage winding. The movable slider 3 can change the resistance by changing the length of the resistance wire of the circuit part of the single-phase low-voltage winding, that is, changing the number of turns of the single-phase low-voltage winding to gradually change the current in the output circuit. When the connected load requires a voltage other than the three fixed output voltages of the transformer, the accurate output current can be obtained by adjusting the movable slider 3, so that the output of the power supply system is more consistent with the power demand of the load, and the output adjustment flexibility of the power supply system is improved.

[0030] The number of the movable slides 3 can be set to three, that is, each of the single-phase low-voltage windings is connected to a corresponding movable slide 3, and each of the single-phase low-voltage windings can adjust its corresponding output voltage through the corresponding movable slide 3. At the same time, the number of the movable slides 3 can also be set to one, and the movable slide 3 is connected to the single-phase low-voltage winding with the least number of turns; since the output voltage of the single-phase low-voltage winding with the least number of turns is smaller, the movable slide 3 can achieve a higher precision output voltage adjustment under the same moving width, thereby improving the adjustment accuracy.

[0031] The input end of the movable slider 3 is connected to the single-phase low-voltage winding, and the output end thereof is connected to the single-chip microcomputer circuit 4; the single-chip microcomputer circuit 4 mainly includes a single-chip microcomputer chip, and the output ends of one or more movable sliders 3 are connected to multiple input ends of the single-chip microcomputer chip via wires, and the switching state of each input end and each output end of the single-chip microcomputer chip is controlled by a set coding program recorded in the single-chip microcomputer chip, and the coding program is not the content required to be protected by this embodiment, so the coding program is not described in detail here.

[0032] The single-chip circuit 4 may be provided with one or more output terminals, and the output terminals of the single-chip circuit 4 are connected to the load only after passing through the output circuit. In this embodiment, the number of the movable slides 3 is set to three, which are respectively connected to different single-phase low-voltage windings, and the three movable slides 3 are connected to the three input terminals of the single-chip circuit 4, while the number of the output terminals of the single-chip circuit 4 is one. When the output terminal of the single-chip circuit 4 is connected to the load, it is determined which single-phase low-voltage winding has an output voltage slightly greater than the voltage required by the load, and the input terminal corresponding to the single-phase low-voltage winding in the single-chip circuit 4 is opened, and the other input terminals remain closed, and the output voltage is adjusted by the movable slide 3 on the single-phase low-voltage winding until it is adjusted to the same voltage as the voltage required by the load.

[0033] In addition, the number of turns of the three single-phase low-voltage windings can be set to be the same. In addition to the fixed output ends of the three single-phase low-voltage windings being able to output voltage, the three single-phase low-voltage windings can also be connected with corresponding movable sliders 3, and the output ends of the three movable sliders 3 are all connected to the input end of the single-chip circuit 4; the output voltage of each single-phase low-voltage winding can be adjusted individually according to the load connected thereto by the three movable sliders 3, and the output voltage of the power supply system can also be flexibly adjusted according to the power consumption demand of the load.

[0034] Each of the output circuits also includes a smart meter, which is connected to the output end of the output circuit. The smart meter can collect the power consumption of the connected load and can also identify parameters such as the working voltage required for the connected load through the line; in addition, the smart meter is also provided with a wireless communication module, and correspondingly, the single-chip circuit 4 is also provided with a wireless communication module. The smart meter can upload the collected parameters such as the working voltage required for the load to the single-chip circuit 4 through the wireless network. After the single-chip circuit 4 knows which output end is connected to the load and the working voltage required for the load, it can more accurately control the switching state of each input end and each output end, thereby improving the automation program.

[0035] In addition, the single-chip microcomputer circuit 4 is bidirectionally connected to the human-computer interaction module. The single-chip microcomputer circuit 4 can display the received information such as the required working voltage of the load in the human-computer interaction module, and can also control the switching state of each input terminal and each output terminal in the single-chip microcomputer circuit 4 through the human-computer interaction module; the human-computer interaction module can be on each terminal platform, and the user can timely obtain and control the output status of the power supply system through a fixed platform or a mobile terminal, thereby improving the flexibility of the power supply system output.

[0036] At the same time, after knowing the working voltage required by the load, the single-chip circuit 4 automatically determines which single-phase low-voltage winding has an output voltage slightly greater than the voltage required by the load, and marks the corresponding input end of the single-chip circuit 4, and sends a prompt message to the user through the human-computer interaction module, so that the user can quickly know which corresponding movable slide 3 to adjust. The movable slide 3 can also be presented in the form of a virtual button in the human-computer interaction module, so that the user can adjust the position of the corresponding movable slide 3 by adjusting the virtual button in the human-computer interaction module.

[0037] The three-phase transformer 2 in this embodiment has three single-phase low-voltage windings, so that the transformer can perform single-phase independent compensation according to load requirements. At the same time, the output of the single-phase low-voltage winding is further adjusted by moving the slider 3, making the output mode of the power supply system more flexible, and outputting the corresponding voltage according to the actual needs of the load connected to each phase, thereby reducing resource waste.

[0038] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A single-phase balanced power supply system based on a three-phase transformer, characterized in that: include: A power grid, wherein the power grid is connected to a transformer via a three-phase high-voltage line; A transformer, comprising three iron cores, a three-phase high-voltage winding and three single-phase low-voltage windings, wherein the three-phase high-voltage windings are respectively connected to the three-phase high-voltage lines, and each of the iron cores is respectively connected to one of the three-phase high-voltage windings and one of the single-phase low-voltage windings; the fixed output ends of the three single-phase low-voltage windings are all connected to an output circuit; An output circuit, comprising a connected AC / DC unit and a rectifier filter circuit, wherein the fixed output ends of the three single-phase low-voltage windings are all connected to the AC / DC unit, and the AC / DC unit is connected to a load via the rectifier filter circuit; A movable slider, the input end of which is connected to one or three of the single-phase low-voltage windings, and the output end of which is connected to a single-chip microcomputer circuit; A single chip microcomputer circuit, wherein the input end of the single chip microcomputer circuit is connected to the output end of the movable slide, and the output end of the single chip microcomputer circuit is connected to the output circuit.

2. The single-phase balanced power supply system based on a three-phase transformer according to claim 1 is characterized in that: The number of turns of the three single-phase low-voltage windings is different, and the number of turns of the three single-phase low-voltage windings is based on the number of turns of one of the single-phase low-voltage windings, and the number of turns of the other two single-phase low-voltage windings increases or decreases according to a set ratio of the reference number.

3. The single-phase balanced power supply system based on a three-phase transformer according to claim 2 is characterized in that: The number of the movable slider is set to one, and the movable slider is connected to the single-phase low-voltage winding with the least number of turns.

4. The single-phase balanced power supply system based on a three-phase transformer according to claim 2 is characterized in that: The number of the movable slides is set to three, the three movable slides are respectively connected to the three single-phase low-voltage windings, and the output ends of the three movable slides are all connected to the input end of the single-chip circuit.

5. The single-phase balanced power supply system based on a three-phase transformer according to claim 1, characterized in that: The three single-phase low-voltage windings have the same number of turns, and the three single-phase low-voltage windings are respectively connected to corresponding movable slides, and the output ends of the three movable slides are all connected to the input end of the single-chip microcomputer circuit.

6. The single-phase balanced power supply system based on a three-phase transformer according to claim 1, characterized in that: The output circuit also includes a smart meter, which is used to collect power consumption parameters of each load.

7. The single-phase balanced power supply system based on a three-phase transformer according to claim 6, characterized in that: The single chip microcomputer circuit is provided with a wireless communication module, and the single chip microcomputer circuit is connected to the smart meter signal through the wireless communication module.

8. The single-phase balanced power supply system based on a three-phase transformer according to claim 7, characterized in that: The single chip microcomputer circuit is bidirectionally connected to the human-computer interaction module.

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