Power conversion apparatus

Abstract

A power converter includes: a capacitor (12) connected to the input side of an inverter circuit (13a); noise suppression means (10a, 10b) arranged at least one of an input side conductor connected to the input side of the inverter circuit (13a) and an output side conductor connected to the output side of the inverter circuit (13a); quantity-of-electricity detectors (11, 19a, 19b, 19c) arranged at the input side conductor or the output side conductor at the opposite side of the inverter circuit of the noise suppression means (10a, 10b); and a control unit (20) for controlling the inverter circuit (13b) according to a quantity-of-electricity detection signal from the quantity-of-electricity detectors. The power converter can suppress the common mode noise without increasing the parts size, the number of parts, or the cost.

Description

technical field [0001] The present invention relates to a power conversion device having an inverter circuit that converts DC power supplied to an input side into AC power and supplies it to a load connected to the AC side. Background technique [0002] Conventionally, in many industrial fields such as trains and automobiles, power conversion devices having inverter circuits composed of semiconductor switching elements have been widely used. For example, there is a power conversion device that has an inverter circuit that is mounted on an electric car, connects the input side to an overhead line through a current collector, and connects the output side to a main motor that drives the electric car. The input-side conductor and the output-side conductor of the circuit are provided with magnetic cores made of magnetic materials for noise suppression (for example, refer to Patent Document 1). [0003] Also, among the power conversion devices mounted on electric cars, there is a...

AI Technical Summary

Problems solved by technology

[0007] In order to effectively suppress the common mode noise current flowing into the control section, it is considered to take the following countermeasures: increase the impedance to the common mode noise current of the voltage detector and current detector respectively provided on the input side and output side of the inverter circuit, or increase the configuration The impedance of the isolation amplifier on the input side of the control section of the inverter circuit is controlled, but taking this countermeasure will lead to an increase in the size of components, an increase in the number of components, and an increase in cost, etc.

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