High-voltage high-power inverter power-on buffer circuit

Abstract

The invention relates to a high-voltage high-power inverter power-on buffer circuit, belonging to a medium equal-power permanent magnet synchronous motor driving technology, and relating to a high-voltage high-power inverter power-on buffer design implementation method. The structure of the high-voltage high-power power-on buffer circuit is optimized in such a scheme that a current limiting resistor can limit the power-on current on a bus of a medium-high voltage and high-power inverter driven by a permanent magnet synchronous motor, the current limiting resistor is bypassed when a thyristor is turned on, and the characteristic of the thyristor also prevents the pump current from flowing back to the bus under the braking condition of the motor. According to the optimized and improved circuit, the power-on current on the inverter is suppressed, the current impact of a storage capacitor is reduced, the pump current is prevented from flowing back to the bus under the braking condition ofthe motor to prevent pollution to the bus power supply, and the stability and reliability of the inverter circuit are improved.

Description

technical field [0001] The invention relates to a high-voltage high-power inverter power-on buffer circuit, which belongs to the medium-power permanent magnet synchronous motor control technology, and relates to a high-voltage high-power inverter power-on buffer design. Background technique [0002] In the control of permanent magnet synchronous motors, three-phase inverters are often used to realize their power drive functions. In the drive of high-voltage and high-power permanent magnet synchronous motors, the high-voltage bus power supply will make the energy storage capacitors bear the load during power-on. The large current impact will reduce the reliability and life of the energy storage capacitor, so the power-on buffer design of the power inverter becomes necessary. The traditional power-on buffer design is realized by current-limiting resistors, relays, and energy storage capacitors. During power-on, the current-on current is limited by the current-limiting resistor...

AI Technical Summary

Problems solved by technology

However, after the power-on buffer function is completed, if the relay control signal is disturbed, the relay will be turned off, and the current-limiting resistor will be connected again, making the inverter work out of control

At the same time, when the inverter works in the state of pumping voltage, the pumping voltage will flow back to the bus terminal through the current limiting resistor, polluting the power supply

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