| 摘要 |
PURPOSE:To effectively operate a DC/DC converter even when a load is abruptly shortcircuited by protecting the primary or secondary coil current of a main transformer by utilizing the average value and the maximum value of the DC current corresponding to the primary or secondary coil current. CONSTITUTION:The input current of a DC/DC converter 1 is removed, a pulse width control circuit 2 is operated by the average current corresponding to the input current, thereby protecting the converter 1. The voltage corresponding to the maximum value of the input current of the converter is produced form a resistor RV2, and the difference between the voltage and the reference voltage E2 is obtained by a comparator 4. When the voltage corresponding to the maximum value of the input current of the converter 1 is larger than the reference voltage E2, a stop signal is immediately fed to a half-cycle stop circuit 5, and the vibration is stopped only during the half period. |
