Patent ID: 7079587
Filing Date: 2006-07-18
Classification: G07C,H02J,H02M

Abstract:
1. A signal transmitter comprising: a battery; a voltage boosting control signal generating means for sequentially generating a voltage boosting control signal through application of an output voltage of the battery as a power source voltage; voltage boosting means including a switching means for generating a switching signal with a switching operation through input of the voltage boosting control signal to conduct a voltage boosting operation to boost the output voltage of the battery to a predetermined voltage based on the switching signal; and transmitting means operated with the boosted voltage for transmitting data, wherein a period of the voltage boosting control signal has a signal generation allowing period for allowing generation of the switching signal and a signal generation inhibiting period following the signal generation allowing period to inhibit generation of the switching signal, the signal generation allowing period being increased as time passes to increase a number of generation of the switching signal, wherein the switching means generates the switching signal during the signal generation allowing period of the voltage boosting control signal for every generation of the voltage boosting control signal and stops generation of the switching signal during the signal generation inhibiting period, and wherein the voltage boosting means boosts the output voltage of the battery stepwise to the predetermined voltage for every generation of the switching signal.