| 摘要 |
PURPOSE:To make it possible to control properly in accordance with each time by selecting the minimum pulse width for the value corresponding to invertor operating frequency as the present time as well as synchronizing of the minimum width signal with ignition pulse. CONSTITUTION:A comparator 1 compares variations in output current actual value and its command value with previously set upper and lower limited set point, and output corresponding to its result is given to a pulse shaping distribution circuit 3 through an or-gate 2 to form an on/off pulse. Four signals with different pulse widths are outputted from a counter 7. Average operating frequency of an ignition pulse is detected by the minimum pulse width decision circuit 9, one of four pulse signals is selected through a multiplexer 8 in accordance with its frequency region. The ignition pulse is formed on the basis of one out of four output from the counter 7 selected through the multiplexer 8. |
