Abstract: In an electric power converter, a main circuit unit and a control unit are detachably attached to each other, and another control unit differing in a control manner can be newly attached to the single main circuit unit. Moreover, the main circuit unit includes a storage unit that stores at least characteristics concerning the main circuit unit, calibration values with respect to the various detectors, a production history, an operation history, and specifications.

Abstract: In an electric power converter, a main circuit unit and a control unit are detachably attached to each other, and another control unit differing in a control manner can be newly attached to the single main circuit unit. Moreover, the main circuit unit includes a storage unit that stores at least characteristics concerning the main circuit unit, calibration values with respect to the various detectors, a production history, an operation history, and specifications.

Abstract: A DC/DC power source device of this invention can regulate an imbalance voltage applied to a smoothing circuit and reduce a loss as well as a packaging area. The device also can achieve miniaturization of the circuit.

Abstract: A DC/DC power source device of this invention can regulate an imbalance voltage applied to a smoothing circuit and reduce a loss as well as a packaging area. The device also can achieve miniaturization of the circuit.

Abstract: An inverter apparatus having a compact design and a changeable heat sink. The apparatus includes a power module formed in a case having pairs of parallel sides and containing the respective main circuit semiconductor devices for converting an alternating current input into a direct current and then further into an alternating current of variable frequency. The heat sink also has pairs of parallel sides and interfaces with the case in a plane whereon the projections of the sink and the case are coextensive. The apparatus also has a body with pairs of parallel sides that fasten to the case and constitute part of the enclosure of the inverter apparatus. The body, case, heat sink and associated circuit elements have alignment structures that permit easy and reliable disassembly and assembly of the apparatus.