A SELF-POWERED ACCELERATION SENSING DEVICE

摘要

Disclosed is a self-powered acceleration sensing device. The device includes an acceleration sensing element for converting vibration into electrical energy, and a charge accumulator electrically connected to the acceleration sensing element to accumulate at least a portion of the electrical energy converted from vibration by the acceleration sensing element over a period of time. The device further includes a load to be powered by discharge of the portion of the electrical energy from the charge accumulator and being capable of producing an output that is directly observable by an operator, and a switch for controlling discharge of electrical energy from the charge accumulator to the load. The switch performs switching between a first condition in which current is substantially prevented from passing through the load, and a second condition in which the portion of the electrical energy is discharged from the accumulator to the load. Moreover, switching is controlled by an amount of energy accumulated in the charge accumulator.