Research on electric energy harvesting from high-voltage transmission line

In order to solve the problem of the power supply for the equipment or function module installed upon high-voltage transmission line, an electric power acquisition method from high-voltage transmission line based on electric current sensor is presented. Firstly, magnetic permeability, hysteresis loss and other performance parameters of the materials of silicon steel and nanocrystal are compared. Then the magnetic material of nanocrystal is selected to be made as the iron core of the sensor and the number of windings of the electric current sensor is calculated. In order that the collected power can be converted to a stable DC voltage source, a signal processing circuit is designed, which includes rectifier circuit, signal shaping circuit, extra energy consuming circuit and voltage stabilizing circuit. The results of tests show that when the bus current of transmission line is in the range of 5.0A-40.0A, a stable DC voltage source can be supplied to the function module installed upon the transmission line.