Drive device

A drive device, comprising:

• an electricity storage device;
• a motor;
• an inverter that drives the motor;
• a booster converter being installed between the electricity storage device and the inverter;
• and
• a controller that performs switching control on a switching element of the inverter and controls the booster converter,
• wherein
• for the switching control on the switching element of the inverter,
• the controller is programmed to switch between a pulse-width modulation control mode and a first square wave control mode according to a modulation percentage when the booster converter is controlled such that a voltage acting on the inverter becomes equal to or higher than a threshold voltage that is based on an electricity from the electricity storage device,
• the controller is programmed to switch between the pulse-width modulation control mode and a second square wave control mode according to a modulation percentage when the booster converter is controlled such that a voltage acting on the inverter becomes lower than the threshold voltage, and
• the first square wave control mode is a mode using a square wave pulse pattern in which a first half cycle or a latter half cycle of each cycle is a square wave pulse,
• the second square wave control mode is a mode using the square wave pulse pattern when a rotation speed of the motor is equal to or higher than a first predetermined rotation speed that is higher than a first resonance region,
• the second square wave control mode is a mode using a first switching pattern when a rotation speed of the motor is lower than the first predetermined rotation speed,
• the first switching pattern forms one or more slits in a region where a square wave pulse in the square wave pulse pattern exists,
• the first switching pattern forms a short pulse having a same width as the slit at a same timing as the slit in a region where no square wave pulse exists,
• the first switching pattern suppresses a LC resonance in the first resonance region.