Abstract: A rotary electric machine driving device including: an inverter that is electrically interposed between a direct-current power supply and the rotary electric machine, and converts electric power between a direct current and an alternating current; a smoothing capacitor that is electrically interposed between the direct-current power supply and the inverter, and is connected between a positive pole and a negative pole on a direct-current side of the inverter; an inverter control unit that controls switching of a switching element of the inverter according to a predetermined switching frequency; and an inductance control unit that switches a direct-current side inductance between a positive pole of the direct-current power supply and a positive pole of the smoothing capacitor, according to the switching frequency, between a predefined standard inductance and a high inductance that is higher than the standard inductance.

Abstract: A rotary electric machine driving device including: an inverter that is electrically interposed between a direct-current power supply and the rotary electric machine, and converts electric power between a direct current and an alternating current; a smoothing capacitor that is electrically interposed between the direct-current power supply and the inverter, and is connected between a positive pole and a negative pole on a direct-current side of the inverter; an inverter control unit that controls switching of a switching element of the inverter according to a predetermined switching frequency; and an inductance control unit that switches a direct-current side inductance between a positive pole of the direct-current power supply and a positive pole of the smoothing capacitor, according to the switching frequency, between a predefined standard inductance and a high inductance that is higher than the standard inductance.

Abstract: A switching element unit is implemented which can include a smoothing capacitor while achieving reduction in overall size. A smoothing capacitor is a ceramic capacitor whose dielectric portions are formed of a ceramic material, and outer surfaces of the smoothing capacitor include an element placement surface formed integrally with the dielectric portions. A positive-side connection electrode P1 that is electrically connected to a positive terminal of the smoothing capacitor and a negative-side connection electrode that is electrically connected to a negative terminal of the smoothing capacitor are formed on the element placement surface.

Abstract: A switching element unit comprising a switching element and a smoothing capacitor that suppresses variation in DC voltage to be supplied to the switching element. An element mounting surface may be formed in an outer surface of the smoothing capacitor and may be formed integrally with a dielectric portion interposed between electrodes of the smoothing capacitor. A capacitor connection electrode as an electrode may be electrically connected to a terminal of the smoothing capacitor formed on the element mounting surface, and the switching element is placed on the element mounting surface such that a terminal of the switching element is electrically connected to the capacitor connection electrode.

Abstract: A switching element unit comprising a switching element and a smoothing capacitor that suppresses variation in DC voltage to be supplied to the switching element. An element mounting surface may be formed in an outer surface of the smoothing capacitor and may be formed integrally with a dielectric portion interposed between electrodes of the smoothing capacitor. A capacitor connection electrode as an electrode may be electrically connected to a terminal of the smoothing capacitor formed on the element mounting surface, and the switching element is placed on the element mounting surface such that a terminal of the switching element is electrically connected to the capacitor connection electrode.