Triphase variable-frequency power supply with high power and operating method thereof

A variable frequency power supply and high-power technology, which is applied in the direction of converting AC power input into AC power output, output power conversion device, starter of a single multi-phase induction motor, etc. The effect of load adaptability and response speed, saving peripheral circuit design, improving reliability and anti-interference ability

Active Publication Date: 2011-08-17
SHANDONG WOCEN POWER SUPPLY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] 3. It is difficult to solve the problem of motor vibration caused by resonance

Method used

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  • Triphase variable-frequency power supply with high power and operating method thereof
  • Triphase variable-frequency power supply with high power and operating method thereof
  • Triphase variable-frequency power supply with high power and operating method thereof

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Embodiment

[0071] figure 1 It is a block diagram of the overall structure of the present invention, the three-phase power input from the grid is converted to AC / DC through the rectifier circuit (2), and the DC bus capacitor (5) is charged through the starting current limiting resistor (4), and the starting current limiting resistor starts To limit the charging current, to prevent the damage of the device and the impact on the power grid caused by the excessive charging current when the power is turned on. While charging, measure the voltage on the DC bus capacitor (5) through the DC bus monitoring circuit (9), when the charging voltage reaches more than 90% of the rated value, close the soft start switch (3), and start the current limiting resistor ( 4) Short circuit. The inverter unit (6) realizes DC / AC conversion, and converts the DC power of the DC bus capacitor (5) into AC power with a certain frequency and amplitude. The output of the inverter unit (6) is stepped up or stepped dow...

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PUM

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Abstract

The invention provides a triphase variable-frequency power supply with high power and an operating method thereof, belonging to the technical field of variable-frequency power supplies. The variable-frequency power supply comprises a triphase grid input circuit, a rectifying circuit, an inverter unit, an output transformer, a direct-current (DC) bus monitoring circuit, an inverter driving circuit, an inverter output monitoring circuit, a transformer output monitoring circuit, an output switch driving circuit, a variable-frequency power supply output monitoring circuit, a digital signal processor (DSP), a keyboard and display circuit, a communication circuit, a vibration detection circuit and a protection circuit, wherein the triphase grid input circuit is connected with the rectifying circuit; the rectifying circuit is connected with the inverter unit; the inverter unit is connected with the output transformer and the DSP by the inverter driving circuit; the output transformer is connected with an output end of the power supply; and an input end and an output end of the output transformer, the output end of the power supply and the output switch are connected with the DSP. The variable-frequency power supply operates under the control of software.

Description

technical field [0001] The invention relates to a three-phase high-power variable-frequency power supply and a working method thereof, belonging to the technical field of variable-frequency power supplies. Background technique [0002] The frequency conversion power supply is a power supply device that converts the alternating current in the mains from AC→DC→AC, and outputs a sine wave. Its output frequency and voltage are adjustable within a certain range, and it is mainly realized by IGBT or IPM inverter technology. The generation and control method of the PWM control waveform is as follows: firstly, the signal generating circuit is used to generate a standard sine wave with a certain frequency and amplitude, and then the sine wave is modulated by a carrier (generally a triangle wave or a sawtooth wave) with a certain frequency and amplitude. Thereby generating PWM control waveform, driving inverter circuit to realize variable frequency output. The control of the output v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458H02H7/10H02P1/30
Inventor 李振虎孔德宝赵金宝
Owner SHANDONG WOCEN POWER SUPPLY EQUIP
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