| 摘要 |
An inverter control system for selectively operating on one of an inverter and backup power source to supply a load current comprises a PLL circuit which includes an integrating amplifier and is operative to synchronize the inverter operation with the voltage of the backup power source. When the power supply to the load is switched from the backup power source to the inverter, a.c. switches for the switching operation are controlled so that both the backup power source and inverter are active simultaneously for a certain period, and during the parallel operation the integrating amplifier is supplied with a reference signal which operates on the inverter to increase its shared load current.
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