| 摘要 |
PURPOSE:To reduce power consumption by connecting respective emitters of transistors, connected in parallel and having different phases from each other, to a common emitter resistor. CONSTITUTION:Switching transistors Q1-Q3 are put on periodically and sequentially upon operation. The transistors Q4-Q7, Q8-Q11, Q12-Q15 of respective phases, which are connected in parallel in one unit of 4 pieces, are put ON periodically and sequentially while only one phase is being operated at an arbitrary time point whereby all of the transistors in respective phases can be balanced even when emitter resistors RE13-RE16, common for three phases, are provided. Accordingly, a circuit can be constituted of 4 pieces of emitter resistors RE13-RE16, which are 1/3 times of the number of 12 emitter resistors provided so far. |
