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US 10,951,062 B2Granted
Wireless power receiver apparatus
AssigneeRohm Co., Ltd.
InventorDaisuke Uchimoto
Life of this patent
Estimating the term…
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.
Claims15
A wireless power receiver apparatus comprising:
- a reception coil;
- a rectifier circuit structured to rectify a current that flows through the reception coil;
- a smoothing capacitor coupled to an output of the rectifier circuit;
- a power supply circuit structured to receive a rectified voltage across the smoothing capacitor, and to supply a stabilized voltage to a load;
- a dump circuit structured to sink a first dump current from an output of the power supply circuit;
- and
- a current detection circuit structured to detect a current that flows through the power supply circuit, and to generate a current detection signal that indicates an amount of the current thus detected,
- wherein the dump circuit is structured to allow a second dump current to sink from an input of the power supply circuit in addition to the first dump current,
- wherein the dump circuit sinks the second dump current before completion of a startup operation of the power supply circuit, and
- wherein the dump circuit sinks the first dump current after the completion of the startup operation of the power supply circuit.
7 more elements
A wireless power receiver apparatus comprising:
- a reception coil;
- a rectifier circuit structured to rectify a current that flows through the reception coil;
- a smoothing capacitor coupled to an output of the rectifier circuit;
- a power supply circuit structured to receive a rectified voltage across the smoothing capacitor, and to supply a stabilized voltage to a load;
- a dump circuit structured to sink a first dump current from an output of the power supply circuit;
- and
- a current detection circuit structured to detect a current that flows through the power supply circuit, and to generate a current detection signal that indicates an amount of the current thus detected,
- wherein the dump circuit is structured to allow a second dump current to sink from an input of the power supply circuit in addition to the first dump current, and
- wherein the dump circuit comprises:
- a first transistor arranged such that a first terminal thereof is coupled to the output of the power supply circuit;
- a feedback resistor arranged between a second terminal of the first transistor and a ground;
- a second transistor arranged such that a first terminal thereof is coupled to the input of the power supply circuit and a second terminal thereof is coupled to the feedback resistor;
- and
- an error amplifier structured to adjust voltages applied to control terminals of the first transistor and the second transistor.
11 more elements
A wireless power receiver apparatus comprising:
- a reception coil;
- a rectifier circuit structured to rectify a current that flows through the reception coil;
- a smoothing capacitor coupled to an output of the rectifier circuit;
- a power supply circuit structured to receive a rectified voltage across the smoothing capacitor, and to supply a stabilized voltage to a load;
- a dump circuit structured to sink a first dump current from an output of the power supply circuit;
- and
- a current detection circuit structured to detect a current that flows through the power supply circuit, and to generate a current detection signal that indicates an amount of the current thus detected,
- wherein the current detection circuit comprises:
- a current mirror circuit comprising a third transistor arranged on a path of a current of the power supply circuit to be detected and a fourth transistor arranged such that a control terminal thereof is coupled to a control terminal of the third transistor so as to form a common control terminal;
- and
- an I/V converter circuit structured to convert a current that flows through the fourth transistor into a voltage.
8 more elements
Dependencies are inferred from the claim text.