CN219304715U - Power supply conversion device and power supply system - Google Patents
Power supply conversion device and power supply system Download PDFInfo
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- CN219304715U CN219304715U CN202222535536.6U CN202222535536U CN219304715U CN 219304715 U CN219304715 U CN 219304715U CN 202222535536 U CN202222535536 U CN 202222535536U CN 219304715 U CN219304715 U CN 219304715U
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Abstract
The utility model provides a power supply conversion device and a power supply system, wherein the power supply conversion device comprises a shell and a power supply conversion unit arranged in the shell, the power supply conversion unit comprises a rectifier, a three-phase inverter and a three-phase transformer, wherein the rectifier, the three-phase inverter and the three-phase transformer are electrically connected with an external power supply, the output end of the rectifier is electrically connected with the input end of the three-phase inverter, and the output end of the three-phase inverter is electrically connected with the input end of the three-phase transformer. According to the utility model, the power supply conversion unit is arranged in the shell and comprises the rectifier, the three-phase inverter and the three-phase transformer, so that an external power supply (such as mains supply) is converted into alternating current with required voltage and frequency, the power supply conversion rate is high, the stability is good, the structure is simple, and the cost is low.
Description
Technical Field
The present utility model relates to the field of electrical power technology, and in particular, to a power supply conversion device and a power supply system.
Background
The power supply conversion device is used for converting high-voltage power into low-voltage power equipment, and power supplies with different frequencies and different voltage levels are adopted by different countries or different manufacturers when the power equipment is designed, and the foreign power equipment is used in China by taking imported industrial equipment as an example, the power supply standard of the foreign power equipment is three-phase 230V60Hz, and the power supply standard of the Chinese industrial equipment is three-phase 380V 50Hz, so that the power conversion is needed.
At present, the existing power supply conversion is controlled by a single-chip processor, however, the single-chip processor is easy to be interfered, a dead halt phenomenon often occurs, the stability and the reliability are poor, the reliability and the high efficiency of a variable frequency power supply system cannot be ensured, the power supply conversion efficiency of the existing power supply conversion device is only 85%, the efficiency is low, and the circuit structure is complex.
Disclosure of Invention
The utility model aims to overcome the defects of poor stability, low power conversion efficiency and complex circuit structure of a power supply conversion device in the prior art and provides the power supply conversion device and a power supply system.
The technical scheme of the utility model provides a power supply conversion device which comprises a shell and a power supply conversion unit arranged in the shell, wherein the power supply conversion unit comprises a rectifier, a three-phase inverter and a three-phase transformer which are electrically connected with an external power supply, the output end of the rectifier is electrically connected with the input end of the three-phase inverter, and the output end of the three-phase inverter is electrically connected with the input end of the three-phase transformer.
Further, the power conversion unit further comprises a controller electrically connected with the three-phase inverter.
Further, the power conversion unit further comprises an input breaker and an output breaker which are electrically connected with the external power supply, wherein the output end of the input breaker is electrically connected with the input end of the rectifier, and the input end of the output breaker is electrically connected with the output end of the three-phase transformer.
Further, the power conversion unit further includes a first filter connected in parallel with the three-phase inverter.
Further, the power conversion unit further includes a second filter connected in parallel with the output breaker.
Further, the power conversion unit further comprises a voltage sensor, wherein the input end of the voltage sensor is electrically connected with the output end of the three-phase transformer, and the output end of the voltage sensor is electrically connected with the controller.
Further, the power conversion unit further comprises a current sensor, wherein the input end of the current sensor is electrically connected with the output end of the three-phase transformer, and the output end of the current sensor is electrically connected with the controller.
Further, the power conversion unit further comprises a temperature sensor, wherein the input end of the temperature sensor is electrically connected with the output end of the three-phase transformer, and the output end of the temperature sensor is electrically connected with the controller.
Further, a display electrically connected with the controller is arranged on the shell.
The technical scheme of the utility model also provides a power supply system which comprises the power supply conversion device.
After the technical scheme is adopted, the method has the following beneficial effects: through setting up the power conversion unit in the casing, the power conversion unit includes rectifier, three-phase inverter and three-phase transformer, makes external power (like mains supply) change the alternating current of required voltage and frequency, and the power conversion rate is high, stability is good, simple structure, with low costs.
Drawings
The present disclosure will become more readily understood with reference to the accompanying drawings. It should be understood that: the drawings are for illustrative purposes only and are not intended to limit the scope of the present utility model. In the figure:
fig. 1 is a schematic structural diagram of a power conversion device according to an embodiment of the present utility model;
fig. 2 is a schematic circuit diagram of a power conversion unit.
Detailed Description
Specific embodiments of the present utility model will be further described below with reference to the accompanying drawings.
It is to be readily understood that, according to the technical solutions of the present utility model, those skilled in the art may replace various structural modes and implementation modes with each other without changing the true spirit of the present utility model. Accordingly, the following detailed description and drawings are merely illustrative of the utility model and are not intended to be exhaustive or to limit the utility model to the precise form disclosed.
Terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible to be mentioned in the present specification are defined with respect to the configurations shown in the drawings, which are relative concepts, and thus may be changed according to different positions and different use states thereof. These and other directional terms should not be construed as limiting terms.
As shown in fig. 1 and 2, the power conversion device provided by the utility model comprises a shell 10 and a power conversion unit 20 arranged in the shell 10, wherein the power conversion unit 20 comprises a rectifier 21 electrically connected with an external power supply, a three-phase inverter 22 and a three-phase transformer 23, the output end of the rectifier 21 is electrically connected with the input end of the three-phase inverter 22, and the output end of the three-phase inverter 22 is electrically connected with the input end of the three-phase transformer 23.
The power conversion device provided by the utility model mainly comprises a shell 10 and a power conversion unit 20.
The casing 10 is a hollow cavity structure, such as a cabinet structure, and the casing 10 is used for installing the power conversion unit 20, so as to protect the power conversion unit 20.
The power conversion unit 20 includes a rectifier 21, a three-phase inverter 22, and a three-phase transformer 23.
The input end of the rectifier 21 is electrically connected with an external power source (such as mains supply), the output end of the rectifier 21 is electrically connected with the three-phase inverter 22, and the rectifier 21 is used for rectifying three-phase mains supply into direct current (such as 380V/50Hz mains supply into 540V direct current).
The input end of the three-phase inverter 22 is electrically connected with the output end of the rectifier 21, the output end of the three-phase inverter 22 is electrically connected with the input end of the three-phase transformer 23, and the three-phase inverter 22 is used for converting direct current output by the rectifier 21 into 60Hz alternating current, such as converting 540V direct current output by the rectifier 21 into 280V/60Hz alternating current, so that the power conversion efficiency is improved.
Preferably, the three-phase inverter 22 is an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT).
The input end of the three-phase transformer 23 is electrically connected with the output end of the three-phase inverter 22, and the three-phase transformer 23 is used for reducing the voltage output by the three-phase inverter 22, for example, converting the 280V voltage output by the three-phase inverter 22 into 230V voltage, so as to play a role in stabilizing the output and improve the stability.
Preferably, to further improve stability, the dc output is isolated from the ac output, the control circuit is isolated from the ac output, and the three-phase transformer 23 is an isolation transformer.
Preferably, the three-phase transformer 23 is connected in a delta-Y connection mode, so that four-wire output can be obtained, and the utilization rate of the direct current voltage is further improved.
According to the power supply conversion device, the power supply conversion unit is arranged in the shell and comprises the rectifier, the three-phase inverter and the three-phase transformer, so that an external power supply (such as mains supply) is converted into alternating current with required voltage and frequency, the power supply conversion rate is high, the stability is good, the structure is simple, and the cost is low.
In one embodiment, the power conversion unit 20 further includes a controller (not shown) electrically connected to the three-phase inverter 22.
The controller is used for controlling the frequency of the output current of the three-phase inverter 22, such as controlling the three-phase inverter 22 to output an alternating current power supply of 60Hz, so as to realize automatic control.
In one embodiment, in order to facilitate the control of the turning on and off of the power supply conversion device, the power supply conversion unit 20 further includes an input breaker 24 electrically connected to the external power supply, and an output breaker 25, wherein an output terminal of the input breaker 24 is electrically connected to an input terminal of the rectifier 21, and an input terminal of the output breaker 25 is electrically connected to an output terminal of the three-phase transformer 23.
The input end of the input breaker 24 is electrically connected with an external power supply, the output end of the input breaker 24 is electrically connected with the input end of the rectifier 21, and the input breaker 24 is used for controlling the connection and disconnection of the external power supply and the rectifier 21.
The input end of the output breaker 25 is electrically connected with the output end of the three-phase transformer 23, the output end of the output breaker 25 is electrically connected with the power equipment to be connected, and the output breaker 25 is used for controlling the connection and disconnection of the three-phase transformer 23 and the power equipment to be connected.
In one embodiment, the power conversion unit 20 further includes a first filter 26, an input terminal of the first filter 26 is electrically connected to an output terminal of the rectifier 21, and an output terminal of the first filter 26 is electrically connected to an input terminal of the three-phase inverter 22.
The first filter 26 is connected in parallel with the three-phase inverter 22, and the first filter 26 is used for filtering ripple waves in the output voltage of the rectifier 21, preventing interference, and further improving stability.
In one embodiment, the power conversion unit 20 further includes a second filter 27, an input terminal of the second filter 27 is electrically connected to an output terminal of the three-phase transformer 23, and an output terminal of the second filter 27 is electrically connected to the output breaker 25.
The second filter 27 is connected in parallel with the output breaker 25, and the second filter 27 is used for filtering out higher harmonics in the output voltage of the three-phase transformer 23, so as to obtain a smooth three-phase sine wave, prevent interference, and further improve stability.
In one embodiment, the power conversion unit 20 further includes a voltage sensor electrically connected to the output terminal of the three-phase transformer 23.
The voltage sensor is used for detecting the voltage output by the three-phase transformer 23 and transmitting the detected voltage to the controller, so that the over-high voltage output by the three-phase transformer 23 is prevented, the overvoltage protection function is achieved, the waveform distortion degree when the nonlinear load is carried out and the three-phase inverter 22 is not damaged when the current is large, the voltage closed-loop feedback control is realized, and the stability is further improved.
In one embodiment, the power conversion unit 20 further includes a current sensor electrically connected to the output terminal of the three-phase transformer 23.
The current sensor is used for detecting the current output by the three-phase transformer 23 and transmitting the detected current to the controller, so that the overhigh current output by the three-phase transformer 23 is prevented, the overcurrent protection function is realized, the waveform distortion degree when the nonlinear load is carried out and the three-phase inverter 22 is not damaged when the current is high, the current closed-loop feedback control is realized, and the stability is further improved.
In one embodiment, the power conversion unit 20 further includes a temperature sensor electrically connected to the output terminal of the three-phase transformer 23.
The temperature sensor is used for detecting the temperature of the output end of the three-phase transformer 23, transmitting the detected temperature to the controller, preventing the temperature of the output end of the three-phase transformer 23 from being too high, playing an over-temperature protection role, realizing temperature closed loop feedback control and further improving the stability.
In one embodiment, the housing 10 is provided with a display 11 electrically connected to a controller.
The display 11 is arranged on the outer surface of the shell 10, the display 11 is electrically connected with the controller, and the display 11 is used for respectively displaying the voltage, the current and the temperature detected by the electric connection of the voltage sensor, the current sensor and the temperature sensor, so that the display is convenient to check.
Preferably, for further convenience of viewing, the display 11 includes an input voltage display unit 111 electrically connected to an external power source, an input current display unit 112, and an output voltage display unit 113, an output current display unit 114, an output power display unit 115, and an output frequency display unit 116 electrically connected to the three-phase transformer 23.
Taking an external power supply of 40KVA as an example, the power conversion efficiencies when the loads are 10%,40%,70% and 100% are respectively measured, and the obtained power conversion efficiencies are shown in the following table:
the table shows that when the power supply conversion device provided by the utility model is used for power supply conversion, the power supply conversion efficiency is higher, the power supply conversion efficiency is 93% -96.5%, the average efficiency is about 95%, and the power supply conversion device is remarkably higher than the level that the existing power frequency conversion power supply has 85%.
The technical scheme of the utility model also provides a power supply system which comprises the power supply conversion device.
According to the power supply system provided by the utility model, the power supply conversion unit is arranged in the shell and comprises the rectifier, the three-phase inverter and the three-phase transformer, so that an external power supply (such as mains supply) is converted into alternating current with required voltage and frequency, the power supply conversion rate is high, the stability is good, the structure is simple, and the cost is low.
What has been described above is merely illustrative of the principles and preferred embodiments of the present utility model. It should be noted that several other variants are possible to those skilled in the art on the basis of the principle of the utility model and should also be considered as the scope of protection of the present utility model.
Claims (10)
1. The power supply conversion device is characterized by comprising a shell and a power supply conversion unit arranged in the shell, wherein the power supply conversion unit comprises a rectifier, a three-phase inverter and a three-phase transformer which are electrically connected with an external power supply, the output end of the rectifier is electrically connected with the input end of the three-phase inverter, and the output end of the three-phase inverter is electrically connected with the input end of the three-phase transformer.
2. The power conversion device according to claim 1, wherein the power conversion unit further comprises a controller electrically connected to the three-phase inverter.
3. The power conversion apparatus according to claim 2, wherein the power conversion unit further comprises an input breaker and an output breaker electrically connected to the external power source, an output terminal of the input breaker being electrically connected to an input terminal of the rectifier, and an input terminal of the output breaker being electrically connected to an output terminal of the three-phase transformer.
4. The power conversion apparatus according to claim 3, wherein the power conversion unit further includes a first filter connected in parallel with the three-phase inverter.
5. A power conversion apparatus according to claim 3, wherein the power conversion unit further includes a second filter connected in parallel with the output breaker.
6. The power conversion apparatus according to any one of claims 2 to 5, wherein the power conversion unit further comprises a voltage sensor, an input terminal of the voltage sensor being electrically connected to an output terminal of the three-phase transformer, and an output terminal of the voltage sensor being electrically connected to the controller.
7. The power conversion device according to claim 6, wherein the power conversion unit further comprises a current sensor, an input of the current sensor being electrically connected to an output of the three-phase transformer, an output of the current sensor being electrically connected to the controller.
8. The power conversion device according to claim 7, wherein the power conversion unit further comprises a temperature sensor, an input of the temperature sensor being electrically connected to an output of the three-phase transformer, an output of the temperature sensor being electrically connected to the controller.
9. The power conversion device according to claim 8, wherein a display electrically connected to the controller is provided on the housing.
10. An electric power supply system comprising an electric power supply conversion apparatus according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222535536.6U CN219304715U (en) | 2022-09-23 | 2022-09-23 | Power supply conversion device and power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222535536.6U CN219304715U (en) | 2022-09-23 | 2022-09-23 | Power supply conversion device and power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219304715U true CN219304715U (en) | 2023-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222535536.6U Active CN219304715U (en) | 2022-09-23 | 2022-09-23 | Power supply conversion device and power supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219304715U (en) |
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2022
- 2022-09-23 CN CN202222535536.6U patent/CN219304715U/en active Active
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| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Chen Gangjun Inventor after: Zhou Mingxing Inventor before: Zhang Zhentao Inventor before: Chen Gangjun Inventor before: Zhou Mingxing |