| 摘要 |
A control device of a transformer coupling type booster performs switching control of applying ON/OFF switching signals to the respective switching elements and alternately repeating, at a predetermined cycle, a voltage positive polarity period where an inter-terminal voltage of the low-voltage side winding and an inter-terminal voltage of a high-voltage side winding have a positive polarity, and a voltage negative polarity period where those inter-terminal voltages have a negative polarity. Upon performing the foregoing control, added is control of providing a zero voltage period between the voltage positive polarity period and the voltage negative polarity period of the inter-terminal voltage of the low-voltage side winding and the inter-terminal voltage of the high-voltage side winding in order to lower a transformer effective current value. In this case, the zero voltage period is formed between the voltage positive polarity period and the voltage negative polarity period of the inter-terminal voltage of the low-voltage side winding and the inter-terminal voltage of the high-voltage side winding by providing a phase difference between the respective switching signals to be applied to the respective switching elements of the low-voltage side inverter and providing a phase difference between the respective switching signals to be applied to the respective switching elements of the high-voltage side inverter. |
