Patent ID: 7957488

Claim:
A wireless communication apparatus comprising: a power conversion apparatus which operates a switching operation based on an operation frequency regulated in accordance with an operation clock signal and which converts externally supplied power to a DC power for an inside power source; a wireless communication portion; a high accuracy oscillator which is applied for communication operation of the wireless communication portion, and which generates a predetermined clock signal which becomes a predetermined frequency by dividing at a predetermined division rate; a low accuracy oscillator which has a lower accuracy than the high accuracy oscillator, and which generates a first clock signal close to the predetermined frequency; a frequency divider which divides the predetermined clock signal at the predetermined division rate, and generates a second clock signal; and a control portion which conducts the switching operating in which the operation clock signal supplied to the power conversion apparatus is switched to the second clock signal when the wireless communication portion receives an annunciation signal, and to the first clock signal when receiving of the annunciation signal is suspended, wherein when the second clock signal is supplied to the wireless communication portion, the wireless communication portion conducts an operation, in an intermittent receiving operation, while the annunciation signal is not received, the control portion stops operations of both the wireless communication portion and the high accuracy oscillator, and operation of the power converter apparatus is started based on the first clock signal.