Abstract: A linear regulator includes an input terminal configured to receive an input voltage, an output terminal configured to be applied with an output voltage, an output transistor connected between the input terminal and the output terminal, and constituted by a P-channel MOSFET, a gate control circuit configured to control a gate voltage of the output transistor to stabilize the output voltage at a target voltage based on a feedback voltage corresponding to the output voltage, and an additional circuit, wherein a control range of the gate voltage controlled by the gate control circuit is equal to or higher than a predetermined lower limit voltage, and wherein the additional circuit is configured to lower the gate voltage to below the lower limit voltage when the output voltage falls below a determination voltage lower than the target voltage.

Abstract: A semiconductor device includes a switch circuit and a leakage cancellation circuit. The switch circuit has at least one switch configured as a MOSFET connected between two terminals of a specific element. The leakage cancellation circuit has at least one MOS transistor configured as a MOSFET, is connected to the switch circuit at a specific node, and is configured to inject or extract a leakage current with respect to the specific node.

Abstract: A linear power supply circuit includes: an output stage including a first and a second output transistor connected in parallel between an input terminal to which an input voltage is applied and an output terminal to which an output voltage is applied; a driver configured to drive the first and second output transistors according to the difference between a voltage based on the output voltage and a reference voltage; and a potential difference suppressor configured to suppress the potential difference between the control terminals of the first and second output transistors. The potential difference suppressor includes an operational amplifier. The non-inverting input terminal of the operational amplifier is connected to the control terminal of the first output transistor. The inverting input terminal and the output terminal of the operational amplifier are connected to the control terminal of the second output transistor. The operational amplifier includes a phase compensation element.

Abstract: A signal output circuit includes a comparator including a first input terminal, a second input terminal, and a third input terminal, and one of an inverter provided between an enable terminal configured to receive an enable signal and the first input terminal, and a pull-up resistor connected to the first input terminal, wherein the first input terminal is configured to be supplied with a signal based on the enable signal, wherein the second input terminal is configured to be supplied with a basis voltage, wherein the third input terminal is configured to be supplied with an abnormality detection signal, and wherein the first input terminal and the second input terminal have different polarities from each other.

Abstract: A linear regulator includes an input terminal configured to receive an input voltage, an output terminal configured to be applied with an output voltage, an output transistor connected between the input terminal and the output terminal, and constituted by a P-channel MOSFET, a gate control circuit configured to control a gate voltage of the output transistor to stabilize the output voltage at a target voltage based on a feedback voltage corresponding to the output voltage, and an additional circuit, wherein a control range of the gate voltage controlled by the gate control circuit is equal to or higher than a predetermined lower limit voltage, and wherein the additional circuit is configured to lower the gate voltage to below the lower limit voltage when the output voltage falls below a determination voltage lower than the target voltage.

Abstract: Disclosed herein is a semiconductor chip including a power transistor, a plurality of pads, a plurality of wires arranged to establish continuity between each of the plurality of pads and a first end or a second end of the power transistor, a current detection circuit configured to detect, as a sense voltage, at least one of voltage drops caused in each of the plurality of wires according to a branch current flowing through the wire and a wire resistance component of the wire, and a logic configured to determine a condition of wire bonding of each of the plurality of pads according to a result of the detection by the current detection circuit.

Abstract: Disclosed herein is a semiconductor chip including a power transistor, a plurality of pads, a plurality of wirings each configured to provide electrical continuity between each of the plurality of pads and one end of the power transistor, and a current detection circuit configured to detect, as a sense voltage, at least one of voltage drops occurring in the plurality of wirings, respectively, according to a shunt current flowing through each of the plurality of wirings and a wiring resistance component of each of the plurality of wirings.

Abstract: A wireless power receiver receives a power signal from a wireless power transmitter, the wireless power receiver including a reception antenna including a reception coil, a rectifier circuit that rectifies a current of the reception antenna, a plurality of position detection coils provided near the reception coil or provided to overlap the reception coil, and a position detection unit that detects a positional relation between the position detection coils and a transmission coil of the wireless power transmitter based on a detection signal indicating an electrical state of the position detection coils. An electronic device includes the wireless power receiver. Another electronic device includes a wireless power receiver that receives a power signal from a wireless power transmitter and that can detect a position of a transmission coil of the wireless power transmitter, and a notification unit that notifies a user of information based on the position of the transmission coil.

Abstract: A transmission coil used in a wireless power transmitter includes a first coil, a second coil electrically connected in series with the first coil, and a tap provided at a connection node of the first coil and the second coil, the first coil and the second coil being stacked to at least partially overlap with each other. A transmission antenna includes the transmission coil, a first capacitor and a second capacitor connected in series with the transmission coil, and a switch provided in parallel to a series connection circuit of the second coil of the transmission coil and the second capacitor. A wireless power transmitter includes the transmission antenna and a bridge circuit that drives the transmission antenna. A charger includes the wireless power transmitter.

Abstract: A rectifier circuit rectifies the current that flows through a reception coil. A smoothing capacitor is coupled to the output of the rectifier circuit. A power supply circuit stabilizes the rectified voltage VRECT that occurs across the smoothing capacitor, and supplies the rectified voltage thus stabilized to a load. A dump circuit sinks the first dump current IDUMP from the output of the power supply circuit. A current detection circuit detects the current IOUT that flows through the power supply circuit, and generates a current detection signal S11 that indicates the amount of the current.

Abstract: A transmission coil used in a wireless power transmitter includes a first coil, a second coil electrically connected in series with the first coil, and a tap provided at a connection node of the first coil and the second coil, the first coil and the second coil being stacked to at least partially overlap with each other. A transmission antenna includes the transmission coil, a first capacitor and a second capacitor connected in series with the transmission coil, and a switch provided in parallel to a series connection circuit of the second coil of the transmission coil and the second capacitor. A wireless power transmitter includes the transmission antenna and a bridge circuit that drives the transmission antenna. A charger includes the wireless power transmitter.

Abstract: A wireless power receiver receives a power signal from a wireless power transmitter, the wireless power receiver including a reception antenna including a reception coil, a rectifier circuit that rectifies a current of the reception antenna, a plurality of position detection coils provided near the reception coil or provided to overlap the reception coil, and a position detection unit that detects a positional relation between the position detection coils and a transmission coil of the wireless power transmitter based on a detection signal indicating an electrical state of the position detection coils. An electronic device includes the wireless power receiver. Another electronic device includes a wireless power receiver that receives a power signal from a wireless power transmitter and that can detect a position of a transmission coil of the wireless power transmitter, and a notification unit that notifies a user of information based on the position of the transmission coil.

Abstract: A reception antenna includes a reception coil which receives a power signal. A rectification circuit rectifies an alternating current flowing to the reception antenna. A smoothing capacitor smoothes an output of the rectification circuit. A waveform stabilizer is enabled when a power receiver satisfies a predetermined condition and shifts a parallel resonance frequency of the reception antenna.

Abstract: A wireless power receiver that receives a power signal from a wireless power transmitter includes: a receiving antenna including a receiving coil for receiving the power signal; a rectifying circuit configured to rectify an alternating current flowing through the receiving antenna; a smoothing capacitor configured to smooth an output of the rectifying circuit; an overvoltage detecting circuit configured to compare a rectified voltage generated in the smoothing capacitor with an overvoltage threshold; a modulator configured to change a parallel resonance frequency of the receiving antenna; and a discharging circuit configured to be switched between an enable state and a disable state and configured to enter the enable state during a communication period by the modulator to discharge the smoothing capacitor.

Abstract: A rectifier circuit is coupled to a reception coil, and generates a rectified voltage. A charger circuit receives the rectified voltage, and charges a secondary battery. A modulator coupled to the reception coil modulates a voltage or a current applied to the reception coil based on a control value, and transmits a control packet including the control value to a wireless power transmitter. A charging control unit controls a charging current supplied from the charger circuit to the secondary battery. A power control unit generates a control error value indicating a power transmission rate for the wireless power transmitter, based on the difference between the present rectified voltage and its target value, and outputs the control error value as the control value to the modulator. When the absolute value of the difference is smaller than a predetermined threshold value, the charging control unit changes the charging current.

Abstract: A power receiving apparatus is configured including a control circuit together with a reception coil, a rectifier circuit, a smoothing capacitor, and a modulator. A received power calculation unit calculates an electric power consumption PD of the wireless power receiving apparatus based on a predetermined calculation expression. A parameter acquisition unit acquires a first parameter ? and a second parameter ? via an external component. A correction unit calculates a received electric power PRP of the wireless power receiving apparatus according to a correction expression PRP=?×PD+?.

Abstract: A rectifier circuit is coupled to a reception coil, and generates a rectified voltage. A charger circuit receives the rectified voltage, and charges a secondary battery. A modulator coupled to the reception coil modulates a voltage or a current applied to the reception coil based on a control value, and transmits a control packet including the control value to a wireless power transmitter. A charging control unit controls a charging current supplied from the charger circuit to the secondary battery. A power control unit generates a control error value indicating a power transmission rate for the wireless power transmitter, based on the difference between the present rectified voltage and its target value, and outputs the control error value as the control value to the modulator. When the absolute value of the difference is smaller than a predetermined threshold value, the charging control unit changes the charging current.

Abstract: A rectifier circuit rectifies the current that flows through a reception coil. A smoothing capacitor is coupled to the output of the rectifier circuit. A power supply circuit stabilizes the rectified voltage VRECT that occurs across the smoothing capacitor, and supplies the rectified voltage thus stabilized to a load. A dump circuit sinks the first dump current IDUMP from the output of the power supply circuit. A current detection circuit detects the current IOUT that flows through the power supply circuit, and generates a current detection signal S11 that indicates the amount of the current.

Abstract: A control circuit is provided for a power receiver apparatus. A target voltage range setting unit sets an upper limit voltage VH and a lower limit voltage VL that define a target voltage range REF to be set for a rectified voltage VRECT that develops across a smoothing capacitor. An electric power control unit compares the rectified voltage VRECT with each of the upper limit voltage VH and the lower limit voltage VL, and generates a power control signal DPC based on the comparison result. A modulator modulates the power control signal DPC, and transmits the modulated signal to a wireless power transmitter apparatus via a reception coil. Upon detection of an oscillation state in the rectified voltage VRECT, the target voltage range setting unit expands the target voltage range REF.

Abstract: A wireless power receiver that receives a power signal from a wireless power transmitter includes: a receiving antenna including a receiving coil for receiving the power signal; a rectifying circuit configured to rectify an alternating current flowing through the receiving antenna; a smoothing capacitor configured to smooth an output of the rectifying circuit; an overvoltage detecting circuit configured to compare a rectified voltage generated in the smoothing capacitor with an overvoltage threshold; a modulator configured to change a parallel resonance frequency of the receiving antenna; and a discharging circuit configured to be switched between an enable state and a disable state and configured to enter the enable state during a communication period by the modulator to discharge the smoothing capacitor.