| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a system interconnection inverter of a fuel cell for reducing a loss of the whole DC-DC converter unit. <P>SOLUTION: The DC-DC converter unit 2 includes a full bridge inverter circuit 14, an isolation transformer 16, a rectifier circuit 17, a smoothing circuit 18, a comparator 19 which monitors input current of an isolation transformer 16, and a converter controller 20, which controls the full bridge inverter circuit 14, are provided. The comparator 19 generates a signal if an input current of the isolation transformer 16 exceeds a reference value. In the converter controller 20, a switching carrier frequency of the full bridge inverter circuit 14 is controlled based on an output of the comparator 19 and the output voltage information of the DC-DC converter unit 2 so that the switching carrier frequency is increased by a predetermined value for each carrier if the input current of the isolation transformer 16 exceeds a reference value and the switching carrier frequency is decreased by a predetermined value under control if the input current of the isolation transformer 16 does not exceed the reference value. <P>COPYRIGHT: (C)2009,JPO&INPIT |
