Patent ID: 8299739

Claim:
A motor drive comprising: a direct current power supply; a first buck-boost chopper portion which boosts a voltage of the direct current power supply to provide a direct current power of an inverter portion during a time at which a motor is driven; and a second buck-boost chopper portion configured to boost the direct current voltage of the inverter portion to regenerate a power to the direct current power supply during a time of a regeneration of the motor, the inverter portion being a 120-degree conduction current source inverter and being configured to convert the direct current power of the inverter portion into a multi-phase alternating current power to drive the motor and to convert the multi-phase alternating power into the direct current power to regenerate an electrical power of the motor, and a diode having an anode connected between a reactor of the second buck-boost chopper portion and a direct current positive side of the inverter portion, having a cathode connected to a positive side of a capacitor of the second buck-boost chopper portion, and suppressing a voltage rise in the inverter portion during a gate turn off of the inverter portion.