| 摘要 |
PURPOSE:To provide a changeover device for a variable-voltage to variable- frequency converter, which can improve cost effectiveness without needing an auxiliary variable-voltage to variable-frequency converter. CONSTITUTION:First and second variable-voltage to variable-frequency converters 2a and 2b and first and second switches 3a and 3b for supplying loads 5 with power are connected with each other, and also the first and second switches 3a and 3b are connected to a commercial power source 1. |
