Power converter

Abstract

To prevent the size of a power conversion device from being increased.SOLUTION: A control device 81 precharges a second capacitor C3 by turning off a fourth switch 46 and turning on a fourth switching unit 48. After precharging the second capacitor C3, the control device 81 turns on a second switching unit 72 and the fourth switch 46 and precharges the first capacitor C2 by causing an inverter 52 to perform a step-down operation while keeping the first switch 43 and the fourth switching unit 48 off.SELECTED DRAWING: Figure 1

Claims

[Claim 1] A charger that converts input AC power into DC power, A battery supplied with DC power output from the aforementioned charger, A first capacitor is provided between the charger and the battery, An inverter supplied with DC power output from the aforementioned battery, A second capacitor is provided between the battery and the inverter, A motor equipped with three coils connected in a star configuration and supplied with AC power output from the inverter, A positive busbar connecting the charger and the positive terminal of the battery, A negative busbar connecting the charger and the negative terminal of the battery, A first switching unit is provided on the positive busbar and is capable of switching between connecting and disconnecting the charger and the battery, A connecting wire that connects the point between the charger and the first switching unit on the positive busbar and the neutral point of the motor, A second switching unit is provided on the aforementioned connecting line, which is capable of switching between connecting / disconnecting the positive busbar and the neutral point of the motor, Wiring connecting the battery and the second capacitor, A third switching unit is provided in the aforementioned wiring and is capable of switching between connecting and disconnecting the battery and the second capacitor, An inrush current suppression circuit having a resistor element and a fourth switching unit connected in parallel to the third switching unit, and capable of switching the connection / disconnection of the battery and the second capacitor via the resistor element, A control device is provided, The control device precharges the second capacitor by turning off the third switching unit and turning on the fourth switching unit. A power conversion device that precharges the first capacitor by turning on the second and third switching units and turning off the first and fourth switching units, and then stepping down the inverter.

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