| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of an inverter device having a multiple configuration, in which, since a two-stage change is prevented by selecting a pattern by using a switching pattern table, variations in switching elements configuring the inverter may cause on/off timing of switching to be deviated to make it impossible to completely prevent the two-stage change.SOLUTION: A two-stage change prevention apparatus includes a switching hold circuit that holds an output of a PWM signal for a predetermined time, and a dead-time generation circuit that delays an output of the switching hold circuit by a predetermined time, and outputs it as a switching signal of each single-phase inverter. The switching hold circuit includes a hold time counter circuit having a count section that starts a count when detecting a voltage edge of the single-phase inverter, and a determination section that outputs a signal Sh when the count value is other than 0, and a hold circuit that holds the output of the PWM signal for the predetermined time by the signal Sh. |
