| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a reversed flow preventing device of a fuel cell inverter in which a diode for inserting in series for preventing reversed flow of an electric current is deleted, and which can improve conversion efficiency of the inverter, and can prevent reverse flow of current to the fuel cell side and prevent overvoltage operation of a fuel cell. <P>SOLUTION: The reverse flow protection device of fuel cell inverter has a reverse flow protection control part 5, and DC voltage Vdc and DC current Idc detected at input side of an inverter 2 are inputted to the reverse flow protection control part 5, and AC voltage Vac and AC current Iac detected at the output side of the inverter 2 are inputted to it, and based on these input and output state, judgement operation is made, and a protection operation of the reverse current and over-voltage is commanded to a control part 20 of the inverter 2. When the DC voltage Vdc on the input side is at a prescribed value or less, an operation of constant current control to follow the current command is performed, and when the DC voltage Vdc rises to a limit value Vlim, it is switched to a constant voltage control, and a limiter operation to limit rising of the voltage is performed. <P>COPYRIGHT: (C)2007,JPO&INPIT |
