Abstract: An air conditioning and ventilating system including: an air conditioning device including a heat exchanger configured to generate conditioned air by heat exchange with a refrigerant; a ventilation device communicatively connected to the air conditioning device and including a supply air fan and/or an exhaust fan; an airflow volume detection unit configured to detect an airflow volume equivalent value of the ventilation device; and a control unit. On determination that the airflow volume equivalent value acquired from the airflow volume detection unit is equal to or less than a first predetermined value, the control unit sets an operation of the air conditioning device to a stop state.

Abstract: A power feeder is provided that comprises a power output signal generator, and a controller. The power output signal generator generates a plurality of power output signals of different strengths. The controller performs an increasing or decreasing control to increase or decrease at least one of the strengths of the power output signals based on the strengths of the power output signals at which an electronic device has been detected.

Abstract: The invention provides a power supply device, which is capable of properly supplying the power even if the power is supplied to the power receiving devices having a number exceeding the number that the communication part is capable of simultaneously communicating with. The power supplying device includes: a power supply part, capable of supplying a power to a plurality of external devices; a communication part, capable of communicating with the external devices; and a controller, disconnecting one or more of the external devices based on a power supplied information of the external devices being in a predetermined range in a case that a number of requests for a communication from the external devices exceeds a number that the communication part is capable of communicating with at the same time.

Abstract: A power supply apparatus includes a resonant circuit that determines a resonant frequency, a drive unit that drives the resonant circuit, and a controller that causes the resonant frequency to change between a first resonant frequency and a second resonant frequency. The first resonant frequency is higher than a frequency of a drive signal of the drive unit and the second resonant frequency is lower than the frequency of the drive signal.

Abstract: The invention provides a power supply device, which is capable of properly supplying the power even if the power is supplied to the power receiving devices having a number exceeding the number that the communication part is capable of simultaneously communicating with. The power supplying device includes: a power supply part, capable of supplying a power to a plurality of external devices; a communication part, capable of communicating with the external devices; and a controller, disconnecting one or more of the external devices based on a power supplied information of the external devices being in a predetermined range in a case that a number of requests for a communication from the external devices exceeds a number that the communication part is capable of communicating with at the same time.

Abstract: A power feeder is provided that comprises a power output signal generator, and a controller. The power output signal generator generates a plurality of power output signals of different strengths. The controller performs an increasing or decreasing control to increase or decrease at least one of the strengths of the power output signals based on the strengths of the power output signals at which an electronic device has been detected.

Abstract: A power supply apparatus includes a resonant circuit that determines a resonant frequency, a drive unit that drives the resonant circuit, and a controller that causes the resonant frequency to change between a first resonant frequency and a second resonant frequency. The first resonant frequency is higher than a frequency of a drive signal of the drive unit and the second resonant frequency is lower than the frequency of the drive signal.