Charging control device, frequency converter and charging control method thereof

Abstract

The invention discloses a charging control device, a frequency converter and a charging control method thereof. The device comprises: a controller configured to transmit an reversing signal or holdingsignal according to a wiring state between a pre-charging power output line and a three-phase AC contactor closing power output line in a charging circuit of a frequency converter to be charged; a wire reversing module configured to according to the reversing signal, reverse the wiring state and then transmit a three-phase rectification charging driving signal in a reverse connection state, or according to the holding signal, hold the wiring state and transmit a three-phase rectification charging driving signal not in the reverse connection state; and a charging circuit configured to charge the frequency converter to be charged according to the three-phase rectification charging driving signal in the reverse connection state or the three-phase rectification charging drive signal not in the reverse connection state. The charging control device of the invention can solve the poor reverse phase reliability of the charging line, and achieves an effect of improving the charging reliability.

Description

technical field [0001] The invention belongs to the technical field of frequency converters, and in particular relates to a charging control device, a frequency converter and a charging control method thereof, in particular to a device for realizing a three-phase AC-DC-AC frequency converter bus voltage pre-charging reverse-phase self-recovery scheme, a frequency conversion device device and its charging control method. Background technique [0002] The transition from two-phase rectification pre-charging with resistance current limitation to three-phase rectification charging is a charging method for the DC bus of a three-phase AC-DC-AC inverter. When connecting the wires, it is easy to reversely connect the output line of the pre-charging power supply and the output line of the three-phase AC contactor closing power supply, which will cause the bus bar of the inverter to directly enter the three-phase rectification and unlimited current charging after power-on, seriously a...

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Problems solved by technology

[0003] The object of the present invention is to provide a charging control device, a frequency converter and a charging control method thereof in order to solve the charging line inversion problem existing in the prior art based on the three-phase AC-DC-AC frequency converter bus voltage pre-charging scheme. Phase reliability issues, to achieve the effect of improving charging reliability

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