Rohm Co., Ltd.

Manabu Miyata

Tatsuya Iwasaki

Masatoshi Watanabe

Kenichi Motoki

Takeshi Nozawa

Tomoya Morinaga

A first oscillator is configured to be switchable between a disabled state and an oscillation state in which a first clock signal CLKhaving a first frequency is generated. A second oscillator oscillates at a second frequency that is lower than the first frequency, so as to generate a second clock signal. In (i) a power transfer phase in which electric power is transmitted to a wireless power receiving apparatus, a controller instructs the first oscillator to oscillate, and generates a first pulse signal for controlling a driver according to the first clock signal. In (ii) a selection phase in which the presence or absence of the wireless power receiving apparatus is detected, the controller generates a second pulse signal for controlling the driver at a predetermined time interval, which is measured based on the second clock signal, and during which the first oscillator is set to the disabled state.

Wireless power transmitter

There can be provided a power delivery (PD) device capable of achieving protocols, e.g. Hard Reset, without using any alternative power source, and a control method of thereof. The PD device includes: a power source; a power line configured to deliver power supplied from the power source, to an outside; a switch connected between the power source and the power line; and a control circuit connected to the power line so that power is supplied from the power source to the control circuit, wherein at the time when a Hard Reset protocol is received from the outside through the power line, the control circuit turns from ON to OFF the switch to disconnect the power line from the power source.

Power delivery device and control method of the same

A demodulator is mounted on a wireless power transmitter that conforms to the Qi standard, and demodulates an amplitude modulated signal superimposed on a coil current Ithat flows through a primary coil of a transmission antenna, or otherwise on a coil voltage across both ends of the primary coil. Multiple demodulating units are each configured to have respectively different configurations, to operate in parallel, to extract a demodulated component from the coil current Ior otherwise from the coil voltage, and to generate baseband signals as demodulated signals. A signal processing unit employs a baseband signal that is correctly received, from among the multiple baseband signals generated by the multiple demodulating units, based on an error detection result obtained using a checksum.

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Kyoto, Japan

Manabu Miyata