Inverter drive device and electrically driven vehicle system using the same
This is to reduce electromagnetic noise while reducing a calculation load of a microcomputer. An inverter drive device according to the present invention switches a first control mode, a second control mode, and a third control mode on the basis of vehicle speed information in a motor control device that controls a power converter that drives a polyphase motor by a PWM pulse signal based on a carrier signal, the first control mode being for updating a command voltage signal to the power converter only on a ridge side or a trough side of the carrier signal, the second control mode being for updating a command voltage signal to the power converter both on a ridge side and a trough side of the carrier signal, and the third control mode being for updating a command voltage signal to the power converter only once of ridge-trough-ridge or trough-ridge-trough of the carrier signal.
1. An apparatus comprising:
a microcomputer;
an inverter drive device configured to switch a first control mode, a second control mode, and a third control mode on the basis of vehicle speed information in a motor control device that controls a power converter that drives a polyphase motor by a PWM pulse signal based on a carrier signal; and
a voltage timing generator, wherein
the first control mode is configured to update a command voltage signal to the power converter only on a ridge side or a trough side of the carrier signal,
the second control mode is configured to update a command voltage signal to the power converter both on a ridge side and a trough side of the carrier signal,
the third control mode is configured to update a command voltage signal to the power converter only once of ridge-trough-ridge or trough-ridge-trough of the carrier signal, and
the voltage timing generator changes an update cycle according to a processing load factor of the microcomputer on the basis of a flow of the voltage timing generator.
2. The apparatus according to claim 1 , wherein
the inverter drive device changes a frequency of the carrier signal and the three control modes so that a frequency of electromagnetic noise that occurs due to the PWM pulse signal of the power converter, the PWM signal occurring in the three control modes, does not coincide with a resonance frequency of the polyphase motor.
3. The apparatus according to claim 1 , wherein
the inverter drive device changes a frequency of the carrier signal and the three control modes so that a frequency of electromagnetic noise that occurs due to the PWM pulse signal of the power converter, the PWM signal occurring in the three control modes, does not coincide with a frequency of noise caused by electromagnetic exciting force of the other phase motor.
4. An electrically driven vehicle system comprising:
the apparatus according to claim 1 ; and
a three-phase motor driven and controlled by the inverter drive device.