POWER CONVERSION DEVICE

• Main Authors: HOTTA, Kazushige, TAKATA, Naoki, TANABE, Keisuke
• Format: Patent
• Language: English; French; German
• Published: 29.07.2020
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; BASIC ELECTRIC ELEMENTS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRIC SWITCHES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; EMERGENCY PROTECTIVE DEVICES; GENERATION; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; RELAYS; SELECTORS; TRANSPORTING; VEHICLES IN GENERAL

The purpose of the present invention is to safely use a relay without causing a contact failure in an inrush prevention circuit of a power conversion device, said relay switching between a voltage at contact time and a voltage at hold time. The power conversion device is provided with: a DC conversion unit for converting an AC voltage to a DC voltage; an inrush prevention circuit equipped with a resistor one end of which is connected to the DC conversion unit, and a relay connected to the resistor in parallel; a DC smoothing unit equipped with a smoothing capacitor connected to the other end of the resistor; and a control unit for controlling the inrush prevention circuit. The control unit determines, on the basis of voltage information of a power supply for operating the relay and voltage information of the smoothing capacitor, whether to apply a contact voltage to the relay or to apply a hold voltage smaller than the contact voltage to the relay.