Power conversion device
AssigneeHitachi Astemo, Ltd.
InventorsNobukatsu Yamaguchi, Yuta Nakamura, Yasuhiko Kondo
Life of this patent
Estimating the term…
Abstract
The present power conversion device includes an inverter, a step-up/down converter, a first capacitor, a second capacitor, a voltage sensor, a control device, and a backup power supply. The auxiliary device is connected between the first DC power supply and the step-up/down converter, and the control device includes an abnormality determination unit configured to determine that an abnormality has occurred when a control voltage is equal to or lower than a first threshold value, and a control unit configured to execute discharge control when the abnormality determination unit determines that the abnormality has occurred and an inter-terminal voltage measured by the voltage sensor is equal to or lower than a second threshold value.
Claims6
A power conversion device of a vehicle that includes an electric motor, a first DC power supply, a second DC power supply, and an auxiliary device, the power conversion device comprising:
- an inverter configured to drive the electric motor;
- a step-up/down converter configured to perform a step-up operation of stepping up power from the first DC power supply to supply the power to the inverter, and a step-down operation of stepping down power from the inverter to supply the power to the first DC power supply;
- a first capacitor that is provided between the first DC power supply and the step-up/down converter;
- a second capacitor that is provided between the step-up/down converter and the inverter;
- a voltage sensor configured to measure an inter-terminal voltage of the first capacitor;
- a control device configured to execute discharge control for discharging residual charge of the second capacitor using a control voltage supplied from the second DC power supply as an operation source;
- and
- a backup power supply configured to supply power stored in the first capacitor to the control device,
- wherein the auxiliary device is connected between the first DC power supply and the step-up/down converter, and
- the control device includes:
- an abnormality determination unit configured to determine that an abnormality has occurred when the control voltage is equal to or lower than a first threshold value, and
- a control unit configured to execute the discharge control using a control voltage supplied from the backup power supply as an operation source when the abnormality determination unit determines that an abnormality has occurred and the inter-terminal voltage measured by the voltage sensor is equal to or lower than a second threshold value.
Dependencies are inferred from the claim text.