Abstract: A motor driving apparatus is provided which can minimize ripple current flowing through a DC link capacitor, and downsize the motor driving apparatus. It synchronizes the frequency of the inverter carrier signal for driving an inverter with the frequency of the DC/DC converter carrier signal for driving a DC/DC converter, and carries out control in such a manner that the center of a period during which the input current of the inverter is zero and the center of a period during which the output current of the DC/DC converter is zero are matched.

Abstract: This invention provides a power unit for an automobile including a motor 6 for starting an engine by transmitting a power thereto and generating a power by receiving a power from the engine during rotation thereof, a power converting circuit 5 for transmitting a power to the motor 6, a battery 1, an energy storing source 20 for storing energy, and a DC/DC converter including at least two switching elements 10, 11, charging the energy storing source 20, and recovering energy in the energy storing source 20 to the battery 1. Since the switch provided in the DC/DC converter is normally turned on when the motor 6 generates power by receiving a power from the engine and charges the battery 1 through the power converting circuit 5 and the DC/DC converter, generation of heat from the DC/DC converter circuit part can be suppressed greatly.

Abstract: The invention provides an apparatus for bi-directional power conversion between a DC circuit and an AC circuit, which inexpensively and simply suppresses generation losses of elements and reduces heat generation, wherein a voltage obtained by dividing the U-phase voltage Vu is compared with a voltage obtained by dividing the voltage vpn of a DC circuit by a comparator CP1, and the MOSFET UFETh is turned on at the output timing thereof, and a voltage obtained by dividing the V-phase voltage Vv is compared with a voltage obtained by dividing the voltage Vpn of a DC circuit by a comparator CP2, and the MOSFET UFETh is turned off at the output timing thereof.

Abstract: A power circuit for a battery for, even when an idle-stop operation is continuously performed, preventing reduction of an electric power supplied to a motor at start-up to obtain a set engine rpm. The power circuit includes a series-connected power supply in which a battery having a load and a capacitor group are connected in series with each other, a DC/DC converter for shifting electric power between the battery and the capacitor group, and between the battery and the load, and a controller for controlling the DC/DC converter. The controller detects the voltage of the capacitor group, and when the voltage detected is lower than a first threshold voltage, controls the DC/DC converter so that the capacitor group is charged with electricity.

Abstract: P-electrode 30a and N-electrode 31a of a semiconductor device 2, and capacitors 10 in a plate-like shape or a block-like shape respectively connected to U-phase 40, V-phase 41, and W-phase 42 having a switching element 20 and a diode 21 are built in a semiconductor device 2, and a single or a plurality of capacitors 10 are respectively connected to P-electrodes 30a and N-electrodes 31a in each of the phases, whereby the smoothing capacitors are built in the semiconductor device to reduce wiring inductances, the capacitors are miniaturized, and an entire electric power converting device, i.e. inverter, is miniaturized.

Abstract: P-electrode 30a and N-electrode 31a of a semiconductor device 2, and capacitors 10 in a plate-like shape or a block-like shape respectively connected to U-phase 40, V-phase 41, and W-phase 42 having a switching element 20 and a diode 21 are built in a semiconductor device 2, and a single or a plurality of capacitors 10 are respectively connected to P-electrodes 30a and N-electrodes 31a in each of the phases, whereby the smoothing capacitors are built in the semiconductor device to reduce wiring inductances, the capacitors are miniaturized, and an entire electric power converting device, i.e. inverter, is miniaturized.

Abstract: A current detecting sensor includes parallel flat plates opposed in a substantially U-shape in cross-section. Since the flat plates are opposed to each other, the current detecting sensor has reduced inductance, significantly decreasing frequency dependency of outputs from detection terminals.