| 摘要 |
PURPOSE:To increase the accuracy and speed in charging by providing the first comparator to compare the reference voltage with capacitor charging voltage and by arranging the second comparator to compare the output of integrating circuit with the rectifying value of the power source voltage as well. CONSTITUTION:A power source voltage is inputted into OP amplifier 27 being subjected to full-wave rectification with rectifier 26. In this case, a clock pulse signal b is outputted, in succession a capacitor 29 is gradually discharged and the rush current at the charging initial period is prevented. The maximum phase of the ignition pulse signal m at the capascitor charging time is decided by comparing the reference voltage i of variable resistor 42 and saw tooth wave e by OP amplifier 36. The reference voltage i for charging voltage setting is compared by the differential amplifying type comparator consisting of resistors 43-46 and OP amplifier 47. The current reduction at the charging finishing period is thus prevented and high speed charging can be performed as well as the improvement in charging accuracy.
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