| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent synchronization gap of PWM synchronous control while facilitating configuration and alteration of a system in a power conversion system for supplying the output from power conversion units 2A and 2B to each winding of a motor having a two-phase winding. <P>SOLUTION: A master unit delivers a current control command from a speed control section 1 to a unit 2A and transmits it to a unit 2B, and transmits a synchronization reference signal of PWM carrier to the slave unit 2B. The slave unit synchronizes the phase of PWM carrier with the master unit by comparing the phase between the synchronization reference signal received by a PLL oscillation circuit 20 and the synchronization reference signal of its own unit, and a phase correction circuit 21 advances the phase of the PWM carrier signal by the transmission delay time of the synchronization reference signal. The slave unit shifts the phase of the PWM carrier signal of other units from each other by 180° of the oscillation frequency of switching voltage by the wiring from an inverter to the motor winding. <P>COPYRIGHT: (C)2007,JPO&INPIT |
