Power Supply Based on Small Current Transducer for Wireless Sensor in Smart Grid

With the development of smart grid, more and more intelligent sensors are used in it to monitor the states of grid. However, the energy for wireless intelligent sensors is a hard problem. Among all kinds of approach, such as solar energy, wind energy and battery, etc, power source based-on current transducer (CT) is a good method to provide energy for on-line wireless intelligent sensors without external power supply. This paper gives an analysis for the conversion and present the basic circuit, simulation and experiment results. By means of special energy-extracting coil, coupling inductor, filter and voltage stabilizing circuit, a voltage of 5V could output steadily. Simulation and testing results indicate that this power supply can maintain a steady output from several to one thousand of Ampere.