| 摘要 |
<p>The present invention provides a novel DC-DC converter in which, by achieving constant power control that sets power supply on an output side to be equal to supply power of a fuel cell on an input side, a cell charging current is set to be constant, components are reduced, and stable charging is performed. In a DC-DC converter using, as an input source (Vfc), a fuel cell, a solar cell, or the like, having a relatively large output impedance in a power-supply mode, an arbitrary load (Ro) and secondary battery (B), based on magnetic coupling in which voltage values are determined by a turns ratio between those wound around a winding, are provided as outputs, a second converter (30) is connected between an output of the secondary battery and the load. In addition, a current control circuit (10) connected to the secondary battery is configured to perform control so that, when a current in the load decreases due to an operation of the magnetic coupling, by increasing a charging current which flows into the secondary battery, and, when the current in the load increases, by decreasing the charging current to the secondary battery, an output voltage of the secondary battery is maintained at a set drooping voltage.</p> |
