Power supply apparatus and electronic equipment

摘要

A power supply apparatus is provided, which includes an electromagnetic energy conversion unit for collecting incidental electromagnetic energy of a radio wave that propagates in the air, and converting the incidental electromagnetic energy into electric power, and an input terminal that contacts a human body and inputs the incidental electromagnetic energy via the human body; a matching unit that establishes impedance matching between the electromagnetic energy conversion unit and/or the input terminal and subsequent circuitry; a rectifier unit for rectifying the electric power having an AC waveform inputted from the electromagnetic energy conversion unit and/or from the input terminal and outputting electric power having a DC waveform; and a storage battery that is charged with the rectified electric power having the DC waveform and discharges the charged electric power. The rectifier unit is connected directly to the matching unit, and the matching unit is connected directly to the electromagnetic energy conversion unit and/or the input terminal to establish impedance matching between the electromagnetic energy conversion unit and/or the input terminal and the rectifier unit side. The power supply apparatus also includes a control unit. The control unit controls the charging and discharging of the storage battery, and includes a voltage step-up circuit, which is connected to the storage battery and steps up to a predetermined value a voltage of the electric power having the DC waveform and supplies the stepped-up voltage to the storage battery. The power supply apparatus is a part of an electronic equipment in the form of a wristwatch having a dial plane and a back lid. The back lid constitutes the input terminal and the electromagnetic energy conversion unit is attached on a dial plane side.