Abstract: A power conversion device is provided between a power supply and a load, and converts power from the power supply and supplies the converted power to the load. The power conversion device includes a plurality of switching elements composed of semiconductor elements, and a control device which generates drive signals for controlling the plurality of switching elements. Voltages are respectively applied to the plurality of semiconductor elements, on the basis of the drive signals generated by the control device. The plurality of semiconductor elements have equivalent failure probabilities due to neutron beams. Thus, a failure of the power conversion device due to neutron beams is prevented, and size increase thereof is suppressed.

Abstract: A transformer includes a first iron core group, a second iron core group, and winding portions. The first iron core group includes iron core stacks. The second iron core group includes iron core stacks each disposed to face a corresponding one of the iron core stacks of the first iron core group. Each of the winding portions is wound around its corresponding iron core stack of the first iron core group and its corresponding iron core stack of the second iron core group, the corresponding one iron core stack of the second iron core group facing the corresponding one iron core stack of the first iron core group. The iron core stacks of the first iron core group and the iron core stacks of the second iron core group each include annular iron cores stacked alternately.

Abstract: A transformer includes a first iron core group, a second iron core group, and winding portions. The first iron core group includes iron core stacks. The second iron core group includes iron core stacks each disposed to face a corresponding one of the iron core stacks of the first iron core group. Each of the winding portions is wound around its corresponding iron core stack of the first iron core group and its corresponding iron core stack of the second iron core group, the corresponding one iron core stack of the second iron core group facing the corresponding one iron core stack of the first iron core group. The iron core stacks of the first iron core group and the iron core stacks of the second iron core group each include annular iron cores stacked alternately.

Abstract: In an ignition plug, since a ground electrode is formed in a thin-rod-shape or a mesh-like shape, sufficiently strong radicals are locally generated by a barrier discharge, an anti-inflammation effect by the electrode is small, and the growth of a flame is hardly hindered. Furthermore, by making the thickness dimension of a second dielectric facing a discharge region uniform, the barrier discharge is spread over the surface of the second dielectric, the generation of the radicals is maintained, and combustibility after ignition is promoted. Furthermore, because an end portion of a high voltage electrode and a ground electrode are disposed to face each other within a combustion chamber, a fuel gas introduced into the combustion chamber is liable to flow into the discharge region, and is easily ignited by the radicals generated due to the discharge.

Abstract: A charging device for an electric vehicle includes a wireless power receiving device which receives high-frequency AC power in a non-contact state, a wired power receiving device connected to an external power source for low-frequency AC power, a rectifier which rectifies AC power, an electric power converter which is positioned at a rear part of the rectifier, and an power receiving device switching switch which switches electric power in such a way that any of electric power of both electric power receiving devices is outputted to the rectifier. A high-frequency filter, which removes a high-frequency component, is provided between the rectifier and the electric power converter.

Abstract: In an ignition plug, since a ground electrode is formed in a thin-rod-shape or a mesh-like shape, sufficiently strong radicals are locally generated by a barrier discharge, an anti-inflammation effect by the electrode is small, and the growth of a flame is hardly hindered. Furthermore, by making the thickness dimension of a second dielectric facing a discharge region uniform, the barrier discharge is spread over the surface of the second dielectric, the generation of the radicals is maintained, and combustibility after ignition is promoted. Furthermore, because an end portion of a high voltage electrode and a ground electrode are disposed to face each other within a combustion chamber, a fuel gas introduced into the combustion chamber is liable to flow into the discharge region, and is easily ignited by the radicals generated due to the discharge.

Abstract: A bidirectional non-contact power supply device with its electric power transmission efficiency being high is obtained by a simple configuration. In the bidirectional non-contact power supply device, a coil is included for performing electric power transmission to and reception from another coil through a magnetic field coupling therebetween, and the coil and a capacitor being connected in series are connected on an input-output end of an inverter circuit, wherein a bidirectional buck-boost converter is connected between the inverter circuit and a DC power source (7).

Abstract: A bidirectional non-contact power supply device with its electric power transmission efficiency being high is obtained by a simple configuration. In the bidirectional non-contact power supply device, a coil is included for performing electric power transmission to and reception from another coil through a magnetic field coupling therebetween, and the coil and a capacitor being connected in series are connected on an input-output end of an inverter circuit, wherein a bidirectional buck-boost converter is connected between the inverter circuit and a DC power source (7).

Abstract: In an ignition device of a spark-ignition internal combustion engine that performs ignition with high energy efficiency while reducing power to be input to a spark plug, after a DC-voltage-pulse generation circuit that generates a DC voltage pulse between electrodes of a spark plug is operated by a control circuit, an AC-pulse generation circuit that generates an AC pulse between the electrodes of the spark plug is operated. Furthermore, the control circuit controls the AC-pulse generation circuit with a plurality of group pulses and quiescent periods between the group pulses are provided.

Abstract: A charging device for an electric vehicle includes a wireless power receiving device which receives high-frequency AC power in a non-contact state, a wired power receiving device connected to an external power source for low-frequency AC power, a rectifier which rectifies AC power, an electric power converter which is positioned at a rear part of the rectifier, and an power receiving device switching switch which switches electric power in such a way that any of electric power of both electric power receiving devices is outputted to the rectifier. A high-frequency filter, which removes a high-frequency component, is provided between the rectifier and the electric power converter.

Abstract: An ignition apparatus includes: sparking coil supplying a sparking plug with a high voltage; an energy supply device supplying the sparking coil with energy; a first switch disposed therebetween; and a control device controlling the first switch's conduction. The energy supply device has a DC power supply, a resonance coil connected to the DC power supply, a sparking capacitor connected to the resonance coil, and a second switch disposed between the sparking capacitor and an earth, and charges the sparking capacitor to have a voltage value larger than that of the DC power supply in absolute value by making the resonance coil and the sparking capacitor generate an LC resonance when the second and first switches are turned ON and OFF, respectively, according to an instruction from the control device whereas supplying the sparking coil with energy when the second and first switches are operated inversely according to another instruction.

Abstract: A control circuit performs ON/OFF control for a switching element so that LED current flowing in an LED unit is within a rated current range. In the case where the LED unit is lit, a voltage applied between both ends of series connection of a reactor and the LED unit becomes a first bus voltage, when the switching element is ON, and becomes a voltage lower than the first bus voltage, that is determined based on the first bus voltage and a second bus voltage, when a switching element is OFF.

Abstract: In an ignition device of a spark-ignition internal combustion engine that performs ignition with high energy efficiency while reducing power to be input to a spark plug, after a DC-voltage-pulse generation circuit that generates a DC voltage pulse between electrodes of a spark plug is operated by a control circuit, an AC-pulse generation circuit that generates an AC pulse between the electrodes of the spark plug is operated. Furthermore, the control circuit controls the AC-pulse generation circuit with a plurality of group pulses and quiescent periods between the group pulses are provided.

Abstract: A control circuit performs ON/OFF control for a switching element so that LED current flowing in an LED unit is within a rated current range. In the case where the LED unit is lit, a voltage applied between both ends of series connection of a reactor and the LED unit becomes a first bus voltage, when the switching element is ON, and becomes a voltage lower than the first bus voltage, that is determined based on the first bus voltage and a second bus voltage, when a switching element is OFF.

Abstract: A switching element operates to be turned on or off at a frequency in the order of megahertz. A reactor supplies a resonance current generated by resonance of the reactor with a floating capacitance between electrodes to between the electrodes. The resonance current does not flow in a direct-current power supply. By turning a capacitor and a floating inductance into a serial resonant state, the reactor ideally supplies the resonance current to between the electrodes without influence of the floating inductance. A high-frequency voltage asymmetric in positive and negative polarities is applied to between the electrodes and a current pulse can be made into a short pulse. Therefore, finish machining with high surface roughness can be performed.

Abstract: A first DC/DC converter is connected to a higher-voltage output terminal of a rectifier by alternator wiring, a battery that supplies electric power to an on-board load is connected to the first DC/DC converter, a second DC/DC converter is connected to the higher-voltage output terminal of the rectifier by alternator wiring, and an electrical double-layer capacitor is connected to the second DC/DC converter.

Abstract: An ignition apparatus includes: sparking coil supplying a sparking plug with a high voltage; an energy supply device supplying the sparking coil with energy; a first switch disposed therebetween; and a control device controlling the first switch's conduction. The energy supply device has a DC power supply, a resonance coil connected to the DC power supply, a sparking capacitor connected to the resonance coil, and a second switch disposed between the sparking capacitor and an earth, and charges the sparking capacitor to have a voltage value larger than that of the DC power supply in absolute value by making the resonance coil and the sparking capacitor generate an LC resonance when the second and first switches are turned ON and OFF, respectively, according to an instruction from the control device whereas supplying the sparking coil with energy when the second and first switches are operated inversely according to another instruction.

Abstract: A first DC/DC converter is connected to a higher-voltage output terminal of a rectifier by alternator wiring, a battery that supplies electric power to an on-board load is connected to the first DC/DC converter, a second DC/DC converter is connected to the higher-voltage output terminal of the rectifier by alternator wiring, and an electrical double-layer capacitor is connected to the second DC/DC converter.

Abstract: A projection display uses a light modulating device to modulate, in accordance with image data, light radiated from a light source, project the modulated light onto a screen, and display an image. The projection display separates a unit of time configuring the image data into an effective light time when the light modulating device can express the light as an image on the screen and an ineffective light time when the light modulating device cannot express the light as an image on the screen. The projection display increases the power supplied to the light source during the effective light time over the power supplied to the light source during the ineffective light time.

Abstract: A switching element operates to be turned on or off at a frequency in the order of megahertz. A reactor supplies a resonance current generated by resonance of the reactor with a floating capacitance between electrodes to between the electrodes. The resonance current does not flow in a direct-current power supply. By turning a capacitor and a floating inductance into a serial resonant state, the reactor ideally supplies the resonance current to between the electrodes without influence of the floating inductance. A high-frequency voltage asymmetric in positive and negative polarities is applied to between the electrodes and a current pulse can be made into a short pulse. Therefore, finish machining with high surface roughness can be performed.