| 摘要 |
PURPOSE: To suppress the inrush current flowing into a transformer connected to the output side at the time of starting an inverter by comparing a reference sine wave signal subjected to phase regulation with a zero potential to produce a phase regulated gate signal. CONSTITUTION: One of two reference sine wave signals Q1 , Q2 for setting the ON-OFF timing of each switching element S1 -S4 in an inverter is subjected to amplitude regulation and added to the other before being subjected to phase regulation. The reference sine wave signals Q1 ', Q2 ' are then compared with a zero potential to produce phase regulated gate signals G1 ', G2 '. Consequently, the effective value of output voltage from the inverter can be regulated through phase regulation of gate signals G1 , G2 . In particular, inrush current flowing into a transformer on the output side of the inverter can be suppressed at the time of starting the inverter by decreasing the gain of the reference sine wave signals Q1 , Q2 for regulating the amplitude gradually thereby increasing the effective value of output voltage from the inverter. |
