| 摘要 |
PURPOSE:To prevent the damage of parts even when abnormalities such as the reduction of a reference voltage and the rise of a charged voltage occur by making the setting time of a gate circuit into the time point when the charged current comes to the sufficient value to protect respective elements to constitute a switching after a peak value after a synchronous trigger is inputted. CONSTITUTION:When a synchronous trigger Dt is inputted to a gate circuit 128, a dequeuing gate signal DQG, which comes to a high level only for a prescribed time T, is outputted from the circuit 128. The period T is set up to the time point when a charged current iPFN decrease to the sufficient level to compensate the parts of a dequeuing circuit 12. When a reference voltage VREF falls, the output of a high pressure voltage divider 123 arrives at the reference voltage VREF earlier than a normal condition, therefore, a dequeuing trigger signal Qt occurs within the high level period of the signal DQG. The trigger Qt is limited by a dequeuing control circuit 127 and delayed and outputted after the input of the DQC. Consequently, a current id of the level, by which the parts of the circuit are damaged, does not flow.
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