Abstract: An electric power transmitting device includes a radio frequency power circuit that converts a direct current power supply to radio frequency electric power having a switching frequency, a transmitting coil connected to the radio frequency power circuit and magnetically coupled to a receiving coil in an electric power receiving device, and a transmitting resonance capacitor that is connected to the transmitting coil and that forms a resonant circuit together with the transmitting coil. The transmitting coil has flexibility to allow a coil opening to be closed, and capacitance of the transmitting resonance capacitor is determined so that while the transmitting coil is opened, resonance of the resonant circuit occurs at a resonant frequency, which matches the switching frequency, and while the transmitting coil is substantially closed, the resonance of the resonant circuit does not occur at the switching frequency, which deviates from a resonant frequency of the resonant circuit.

Abstract: A high-frequency power supply device includes a power transmission coil, a high-frequency power circuit which converts direct-current power input from a direct-current power supply into high-frequency power and supply the high-frequency power to the power transmission coil, a detection circuit which detects a voltage based on a circuit operation of the high-frequency power circuit and output a detected voltage, a control circuit configured to control a circuit operation of the high-frequency power circuit and to determine a command value used to protect the high-frequency power supply device based on information externally input into a processor, a D/A converter which performs D/A conversion upon receiving the command value output from the control circuit and output a command voltage, and a comparator which compares the command voltage and the detected voltage with each other and output a stop signal used to stop a circuit operation of the high-frequency power supply device.

Abstract: Power line patterns are, together with a ground pattern, provided separately from control line patterns. The power line pattern is formed at first and second major surfaces of a circuit board. When the circuit board is viewed in plan view, the power line pattern and the power line pattern form a line structure in which the power line pattern and the power line pattern are in parallel with and opposite to each other and the power line pattern is positioned under the power line pattern. The circuit board includes a dielectric between the power line pattern and the power line pattern. These together form an equivalent capacitor and the magnetic flux induced by the current flowing through the power line pattern and the magnetic flux induced by the current flowing through the power line pattern cancel each other out.

Abstract: A switching power supply device includes a power conversion circuit that is provided at a multilayer printed board and includes a plurality of switching circuits and a controller controlling the switching circuits, windings configuring an inductor at the multilayer printed board, and a magnetic sheet on one or both of upper and lower faces of the multilayer printed board. First ends of the windings are connected to the switching circuits, and second ends of the windings are connected to a common output. The controller controls the plurality of switching circuits to periodically vary a position and a time at which magnetic flux generated by current flowing to the windings reaches the maximum magnetic flux density. Thus, the switching power supply device is thin, achieves dispersion of heat generation, handles variations in the magnitude of electric power by varying the area of the board, and effectively reduces unwanted radiation.

Abstract: A planar array coil includes a multilayer substrate at which a plurality of coils are formed and arranged on a plane of the multilayer substrate. First ends of the plurality of coils are connected to switching circuit units of a power conversion circuit, and second ends of the plurality of coils are connected to a common output part. The coils include two coil parts in which currents flow in opposite rotation directions, and one coil part of one coil is adjacent to one coil part of another coil. The plurality of coils are connected such that operation of switching circuits causes currents in regions of adjacent coil parts that extend in parallel to each other to flow in the same direction. Accordingly, adverse effects by unwanted coupling between adjacent coils are reduced and a switching power supply device that includes the planar array coil performs stable power conversion operations.

Abstract: A power transmission circuit is connected to a power transmission coil having a coil aperture. The power transmission circuit includes a conductive or magnetic power-transmission-coil near member opposed to the coil aperture of the power transmission coil, and a repeating coil arranged on a side opposite to a side on which the power-transmission-coil near member is arranged with respect to the power transmission coil and coupled to the power transmission coil at least via a magnetic field. When a shortest distance between the power transmission coil and the power-transmission-coil near member is expressed as (dt1) and a shortest distance between the power transmission coil and the repeating coil is expressed as (dt2), dt2?dt1.

Abstract: A power transmission device includes a power transmission coil, a power-transmission resonance capacitor that forms, together with the power transmission coil, a power-transmission resonance mechanism, and a power transmission circuit electrically connected to the power-transmission resonance mechanism that intermittently applies a direct-current input voltage to the power-transmission resonance mechanism and causes the power transmission coil to generate an alternating-current voltage. The power transmission circuit includes a control circuit section including an oscillator, and a power circuit section formed of an integrated circuit sealed in a small-sized package with a plurality of terminals. The integrated circuit is electrically and directly connected to the power-transmission resonance mechanism. The control circuit section oscillates at a predetermined frequency and outputs a driving signal which is input to the power circuit section.

Abstract: A high frequency power circuit module includes an electronic circuit substrate having a bending section, a high frequency power circuit formed on the electronic circuit substrate, a battery connected to the high frequency power circuit, and a magnetic material sheet having an area larger than that of the battery. The battery is covered with the magnetic material sheet in a state in which the electronic circuit substrate is bent at a bending section. The high frequency power circuit, the battery, and the magnetic material sheet are thermally coupled to each other by a resin sealing member, which is a material having a smaller thermal resistance than that of air.

Abstract: A power reception device includes a power reception coil configured to couple with a power transmission coil included in a power transmission device; a rectifier circuit including a diode and a transistor electrically connected to the power reception coil and configured to rectify a high frequency AC current flowing in the power reception coil; outputs configured to output the current rectified by the rectifier circuit to a load; a voltage detection circuit configured to detect an output voltage Va; and a controller configured to control an operation of the transistor based on the output voltage Va. The controller turns off the transistor when the output voltage Va?the threshold value Va1 is satisfied and causes the rectifier circuit to execute a rated rectification operation, and turns on the transistor when the voltage Va?the threshold value Va2 is satisfied and stops the rated rectification operation.

Abstract: A wireless power supply system includes a power transmission device and a power reception device. A control circuit in the power transmission device causes a power transmission circuit to operate, by a pulse-density modulation control method of controlling density of oscillation pulses for a predetermined period of time, in relationship De1>De2>De3, where De1 indicates the pulse density determined on the basis of a result of demodulation of a transmission signal from the power reception device, De2 indicates the pulse density in a state where a detected output value from the power transmission circuit reaches a predetermined value, and De3 indicates the pulse density in a state where a detected temperature values of a switch element reaches a predetermined value.

Abstract: A high-frequency power supply device includes a power transmission coil, a high-frequency power circuit which converts direct-current power input from a direct-current power supply into high-frequency power and supply the high-frequency power to the power transmission coil, a detection circuit which detects a voltage based on a circuit operation of the high-frequency power circuit and output a detected voltage, a control circuit configured to control a circuit operation of the high-frequency power circuit and to determine a command value used to protect the high-frequency power supply device based on information externally input into a processor, a D/A converter which performs D/A conversion upon receiving the command value output from the control circuit and output a command voltage, and a comparator which compares the command voltage and the detected voltage with each other and output a stop signal used to stop a circuit operation of the high-frequency power supply device.

Abstract: A power circuit module includes an electronic circuit board, a heat generating element mounted on a first surface of the electronic circuit board and being a semiconductor electronic component that constitutes a part of a power circuit, a temperature detecting element that detects the temperature of the heat generating element, an electric circuit wiring, a heat dissipating body that dissipates heat of the heat generating element, and a heat conduction sheet having elasticity and flexibility, and a thickness. The heat conduction sheet is between the heat generating element and the heat dissipating body, the temperature detecting element is thermally connected to the heat generating element via the heat conduction sheet and is electrically connected via the electric circuit wiring, and with regard to the sizes of the components, the following relationship holds: temperature detecting element<heat generating element<heat dissipating body.

Abstract: A high frequency power circuit module includes an electronic circuit substrate having a bending section, a high frequency power circuit formed on the electronic circuit substrate, a battery connected to the high frequency power circuit, and a magnetic material sheet having an area larger than that of the battery. The battery is covered with the magnetic material sheet in a state in which the electronic circuit substrate is bent at a bending section. The high frequency power circuit, the battery, and the magnetic material sheet are thermally coupled to each other by a resin sealing member, which is a material having a smaller thermal resistance than that of air.

Abstract: A switching circuit is connected to an output side of a DC power supply, includes a low-side switch circuit and a high-side switch circuit, and generates high frequency power by switching of the low-side switch circuit and the high-side switch circuit. Snubber circuits are connected between both ends of the low-side switch circuit and both ends of the high-side switch circuit. The snubber circuits include series circuits including inductors and capacitors, and include diodes that are connected in parallel with the inductors.

Abstract: An electric power transmitting device includes a radio frequency power circuit that converts a direct current power supply to radio frequency electric power having a switching frequency, a transmitting coil connected to the radio frequency power circuit and magnetically coupled to a receiving coil in an electric power receiving device, and a transmitting resonance capacitor that is connected to the transmitting coil and that forms a resonant circuit together with the transmitting coil. The transmitting coil has flexibility to allow a coil opening to be closed, and capacitance of the transmitting resonance capacitor is determined so that while the transmitting coil is opened, resonance of the resonant circuit occurs at a resonant frequency, which matches the switching frequency, and while the transmitting coil is substantially closed, the resonance of the resonant circuit does not occur at the switching frequency, which deviates from a resonant frequency of the resonant circuit.

Abstract: A line length between an input end of a switching circuit and a high frequency capacitor is shorter than a line length between an output end of a DC power supply and the high frequency capacitor. A current path going through the switching circuit and the high frequency capacitor is the shortest among a plurality of current paths through which a switching current is caused to flow by switching at the switching circuit. Furthermore, the high frequency capacitor makes the ratio of time during which the voltage across the high-side switch element changes by a switching operation of the high-side switch element and the ratio of time during which the voltage across the low-side switch element changes by a switching operation of the low-side switch element the same, and thus reduces a harmonic wave current included in a current output from the high frequency power generation circuit.

Abstract: When a resonant frequency of a power transmission-side resonance mechanism is expressed by fra, a switching frequency of a first switch circuit and a second switch circuit is expressed by fs, and a resonant frequency of the power transmission-side resonance mechanism and a capacitor of the first switch circuit or the second switch circuit is expressed by frb, a relation of fra<fs?frb is satisfied.

Abstract: A wireless module includes a substrate that includes a first portion, a second portion, and a first flexible portion connecting the first portion and the second portion to each other. The first portion includes a circuit element that is mounted on the first main surface and a circuit including at least the circuit element. The second portion includes a first coil connected to the circuit. The first portion and the second portion face each other. A magnetic sheet is disposed on a second main surface of the second portion, and a battery is disposed between the second main surface of the first portion and the magnetic layer.

Abstract: A power receiving rectifier circuit is configured in series with a power receiving resonance mechanism. A first power receiving device has a load with a small equivalent resistance value, and the frequency response of a voltage gain thereof, which is the ratio of direct-current output to input voltage, is double-peaked. A second power receiving device has a load with a large equivalent resistance value, and a single-peaked frequency response of a voltage gain thereof. For the first power receiving device, by setting a coupling coefficient between power receiving and transmitting coils, the voltage gain is determined by the positional relationship between one of the frequencies at maximum voltage gain and the operating frequency, whereas for second power receiving device, the frequency at maximum voltage gain is determined close to the operating frequency, and the voltage gain is determined by setting a coupling coefficient between power receiving and transmitting coils.

Abstract: A power reception device includes a power reception coil configured to couple with a power transmission coil included in a power transmission device; a rectifier circuit including a diode and a transistor electrically connected to the power reception coil and configured to rectify a high frequency AC current flowing in the power reception coil; outputs configured to output the current rectified by the rectifier circuit to a load; a voltage detection circuit configured to detect an output voltage Va; and a controller configured to control an operation of the transistor based on the output voltage Va. The controller turns off the transistor when the output voltage Va?the threshold value Va1 is satisfied and causes the rectifier circuit to execute a rated rectification operation, and turns on the transistor when the voltage Va?the threshold value Va2 is satisfied and stops the rated rectification operation.