Abstract: An electronic device includes a shielding member, an electric circuit, and a filter capacitor. The electric circuit has an output line and is arranged inside the shielding member. The filter capacitor is arranged outside the shielding member to be connected to the output line.

Abstract: An induction device includes a casing, a coil retainer, a coil that is disposed in the casing and retained to the coil retainer and a core that is disposed in the casing. The coil extends spirally around the core. The core and the coil retainer are fixed to the casing separately.

Abstract: A semiconductor apparatus is comprising a circuit board with a semiconductor device surface-mounted on one surface thereof. A heatsink is disposed and fixed with a connection member and separated with a predetermined distance on one side of the circuit board opposite to the surface where the semiconductor device is mounted. A heat conductive sheet is provided between the circuit board and the heatsink and thermally connecting the semiconductor device and the heatsink through the circuit board. The heat conductive sheet is constituted as a laminate of a first member and a second member and one of the first and second members is a ceramic board whereas the other is a resin sheet material having highly heat conductive fillers mixed therein.

Abstract: A DC-AC converter for converting DC voltage to AC voltage. The converter includes a conversion circuit for converting DC voltage to voltage having a polarity corresponding to AC voltage. A filter circuit receives the converted voltage, smoothes the converted voltage, and outputs the smoothed voltage as AC voltage. A first switch operably connects the voltage conversion circuit and filter circuit. A second switch is arranged between input terminals of the filter circuit. An output current detection circuit detects overcurrent that is greater than a predetermined first threshold. When overcurrent that is greater than the first threshold is detected, the protection circuit stops the supply of power in the voltage conversion circuit, deactivates the first switch, and activates the second switch.

Abstract: A ground detector includes a pair of lines, a first series circuit, a reference portion, a second series circuit, and a detection point. The first series circuit connects the lines to each other. The first series circuit includes first capacitors that are connected in series. The reference portion is connected to a portion of the first series circuit between two of the first capacitors for DC insulating the lines from the reference portion. The second series circuit connects the lines to each other. The second series circuit includes second capacitors that are connected in series. The detecting point is provided in the second series circuit. Each of the lines is connected to the detecting point through at least corresponding one of the second capacitors. The ground detector detects a change of impedance between the lines and the reference portion based on a change of potential of the detecting point with respect to potential of the reference portion.

Abstract: An overcurrent protective device has a current detecting section and a control section. The current detecting section detects the amount of a current flowing through switching elements of an inverter device. The control section determines whether the inverter device is held in a first state or a second state in correspondence with an input from the current detecting section. When it is determined that the inverter device is held in the first state, the control section performs a flywheel operation. When it is determined that the inverter device is held in the second state, the control section performs a regenerative operation. Accordingly, the overcurrent protective device prevents generation of whine when performing overcurrent protective operation.

Abstract: A DC-AC converter directly converts DC voltage to AC voltage. A voltage conversion circuit receives DC voltage at a pair of first input terminals, converts the DC voltage to voltage having a polarity corresponding to the AC voltage, and outputs the converted voltage from a pair of first output terminals insulated from the pair of first input terminals. The filter circuit receives the converted voltage at a pair of second input terminals, smoothes the converted voltage, and outputs the smoothed voltage as an AC voltage from a pair of second output terminals. A first switch circuit is arranged between the pair of first output terminals of the voltage conversion circuit and the pair of second input terminals of the filter circuit to operably connect the voltage conversion circuit and the filter circuit. A second switch circuit is arranged between the second input terminals of the filter circuit.

Abstract: A DC-AC converter for converting DC voltage to AC voltage. The converter includes a conversion circuit for converting DC voltage to voltage having a polarity corresponding to AC voltage. A filter circuit receives the converted voltage, smoothes the converted voltage, and outputs the smoothed voltage as AC voltage. A first switch operably connects the voltage conversion circuit and filter circuit. A second switch is arranged between input terminals of the filter circuit. An output current detection circuit detects overcurrent that is greater than a predetermined first threshold. When overcurrent that is greater than the first threshold is detected, the protection circuit stops the supply of power in the voltage conversion circuit, deactivates the first switch, and activates the second switch.

Abstract: A device for converting AC voltage to DC voltage. The device includes an AC input circuit, a rectifier circuit, a first switch, and a second switch. The AC input circuit includes a pair of first input terminals to which AC current is input, a pair of first output terminals, and at least one inductance element arranged in a path extending from the first input terminals to the first output terminals. The rectifier circuit includes a pair of second input terminals, a pair of second output terminals from which DC current is output, a transformer connected to the second input terminals, and a rectifier arranged between the transformer and the second output terminals. The first switch is connected between the first output terminals and the second input terminals. The second switch is connected between the first output terminals.

Abstract: A method for driving a converter that converts DC voltage to AC voltage. A voltage conversion circuit has first input terminals and first output terminals insulated from the first input terminals. A filter circuit has second input terminals and second output terminals. A first switch circuit connects the first output and second input terminals. A second switch circuit connects the first switch circuit and the second input terminals. The method includes supplying the first input terminals with DC voltage, converting the DC voltage to AC voltage and supplying the converted voltage to the first output terminals, supplying the second input terminals with the converted voltage, stopping the supply of the converted voltage, and maintaining the first switch circuit or the second switch circuit in an activated state to output AC voltage from the second output terminals of the filter circuit.

Abstract: A ground detector includes a pair of lines, a first series circuit, a reference portion, a second series circuit, and a detection point. The first series circuit connects the lines to each other. The first series circuit includes first capacitors that are connected in series. The reference portion is connected to a portion of the first series circuit between two of the first capacitors for DC insulating the lines from the reference portion. The second series circuit connects the lines to each other. The second series circuit includes second capacitors that are connected in series. The detecting point is provided in the second series circuit. Each of the lines is connected to the detecting point through at least corresponding one of the second capacitors. The ground detector detects a change of impedance between the lines and the reference portion based on a change of potential of the detecting point with respect to potential of the reference portion.

Abstract: An overcurrent protective device has a current detecting section and a control section. The current detecting section detects the amount of a current flowing through switching elements of an inverter device. The control section determines whether the inverter device is held in a first state or a second state in correspondence with an input from the current detecting section. When it is determined that the inverter device is held in the first state, the control section performs a flywheel operation. When it is determined that the inverter device is held in the second state, the control section performs a regenerative operation. Accordingly, the overcurrent protective device prevents generation of whine when performing overcurrent protective operation.

Abstract: A drive circuit for a switching device includes a condenser and a leakage route. The switching device includes a standard terminal and a control terminal, and conduction of switching device is controlled in response to voltage that is applied to the control terminal with respect to the standard terminal. The condenser has a first end and a second end. A switching control signal is inputted to the first end, and the second end is connected to the control terminal. The leakage route connects the standard terminal and the control terminal.