Inverter control device and inverter control method
AssigneeHitachi Astemo, Ltd.
InventorsShigehisa Aoyagi, Takafumi Hara, Takaya Tsukagoshi
Life of this patent
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Abstract
An inverter control device performs pulse width modulation by selecting one of a synchronous pulse control mode in which a frequency of a carrier wave used in the pulse width modulation is changed in accordance with a rotation speed of the motor and an asynchronous pulse control mode in which the frequency of the carrier wave is constant regardless of the rotation speed of the motor. At the time of switching from the asynchronous pulse control mode to the synchronous pulse control mode, the inverter control device changes a carrier reference phase that is a reference value of a phase of the carrier wave to a different value before and after the switching.
Claims7
An inverter control device that controls an inverter to rotationally drive a motor by generating a PWM pulse signal for driving a plurality of switching elements included in the inverter by pulse width modulation and outputting the PWM pulse signal to the inverter, wherein
- the inverter control device performs the pulse width modulation by selecting one of a synchronous pulse control mode in which a frequency of a carrier wave used in the pulse width modulation is changed in accordance with a rotation speed of the motor and an asynchronous pulse control mode in which the frequency of the carrier wave is constant regardless of the rotation speed of the motor, and
- at a time of switching from the asynchronous pulse control mode to the synchronous pulse control mode, the inverter control device changes a carrier reference phase that is a reference value of a phase of the carrier wave to a different value before and after the switching.
An inverter control method of controlling an inverter to rotationally drive a motor by generating a PWM pulse signal for driving a plurality of switching elements included in the inverter by pulse width modulation and outputting the PWM pulse signal to the inverter, the method comprising:
- performing the pulse width modulation by selecting one of a synchronous pulse control mode in which a frequency of a carrier wave used in the pulse width modulation is changed in accordance with a rotation speed of the motor and an asynchronous pulse control mode in which the frequency of the carrier wave is constant regardless of the rotation speed of the motor;
- and
- changing, at a time of switching from the asynchronous pulse control mode to the synchronous pulse control mode, a carrier reference phase that is a reference value of a phase of the carrier wave to a different value before and after the switching.
Dependencies are inferred from the claim text.