Zero Standby Power Consumption Method for Wearable Devices

This paper introduces standby power consumption minimizing method using vibration switch sensor for energy harvesting system. Proposed energy harvesting module is composed of coil, bobbin, magnet, spring, vibration switch and energy storage circuit. It is inserted in smart shoes and harvests generated electrical energy when a person walks or runs. It is important to take long battery time in wearable smart devices such as smart shoes. The battery time can be extended with the reduction of power consumption of the system when the system runs or stand-by mode. Proposed system can be divided into two operation modes (running and stand-by mode) from power consumption point of view. The system acquires sensor information and/or communicates with other devices in the running mode, but in stand-by mode, the system waits next running mode to be started. This paper deals with power consumption minimizing method in the stand-by mode. The vibration switch has used, in proposed method, to wake up from stand-by mode. The consumption power for the stand-by mode can be remarkably reduced using this method. Two statuses, a stand-by mode using vibration sensor and a IC sleep mode, have compared to verify the reduction of the power consumption.