| 摘要 |
<p>PURPOSE:To contrive to stabilize a voltage without making a generator larger by variably controlling the duty ratio of the ON-OFF of a switching element in single-phase inverter according to the DC output voltage value of a rectifier circuit in single-phase inverter. CONSTITUTION:A voltage outputted from output terminals R, S, T of a generator is supplied to a load via the rectifier circuit 7 and switching circuit 9 of a single-phase inverter 2. On the other hand, a decimal output type counter 51 counts pulses from a pulse oscillator 50. Then, the output of said counter 51 is converted into a timing pulse TG by an OR-gate 52 and added to the switching element of said switching circuit 9. In this case, when the output voltage of said rectifier circuit 7 is low, the duty ratio of said timing pulse is 60%. On the other hand, when said output voltage becomes higher, an analog switch 64 is turned OFF by a voltage range detection circuit 60 and the duty ratio is 50%.</p> |
