Peak voltage absorption circuit

Abstract

The invention provides a peak voltage absorption circuit, and relates to the field of motor driving. The circuit is used for enhancing the absorption effect on peak voltage generated by a power converter, avoids faults of the power converter and a motor, and reduces loss. The peak voltage absorption circuit is connected with the power converter, is used for absorbing the peak voltage generated by the power converter, and comprises: a peak voltage absorption module which is respectively connected with midpoints of a plurality of power conversion bridge arms in the power converter and is used for absorbing energy of the peak voltage generated by the power converter; and an energy discharge module which is connected with the peak voltage absorption module and is used for discharging the energy absorbed by the peak voltage absorption module.

Description

technical field [0001] The invention relates to the field of motor drive, and relates to a peak voltage absorbing circuit. Background technique [0002] When the high-power converter or frequency converter is driving the motor, due to the long cable between the motor and the motor, it is affected by impedance matching, echo reflection, etc., resulting in too high peak voltage on the converter port and the motor winding, so that Serious faults such as insulation damage and short circuit occurred during the internal period of the motor and converter. [0003] In the prior art, an RC snubber circuit (a circuit structure composed of a resistor R and a capacitor C) or an LRC snubber circuit (a circuit structure composed of an inductor L, a resistor R, and a capacitor C) is used to absorb peak voltages to avoid The motor or converter fails, but due to factors such as large volume, large loss, and inconvenient installation, the peak voltage absorption effect is not ideal. [0004...

AI Technical Summary

Problems solved by technology

[0002] When the high-power converter or frequency converter is driving the motor, due to the long cable between the motor and the motor, it is affected by impedance matching, echo reflection, etc., resulting in too high peak voltage on the converter port and the motor winding, so that Serious faults such as insulation damage, short circuit, etc. occur during the internal period of the motor and converter

[0003] In the prior art, an RC snubber circuit (a circuit structure composed of a resistor R and a capacitor C) or an LRC snubber circuit (a circuit structure composed of an inductor L, a resistor R, and a capacitor C) is used to absorb peak voltages to avoid The motor or converter fails, but due to factors such as large volume, large loss, and inconvenient installation, the absorption effect on peak voltage is not very ideal

[0004] To sum up, the circuit scheme for absorbing peak voltage in the prior art has problems such as large loss and poor peak voltage absorption effect.

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