High-reliability big-work-range sensing energy taking device based on adjustable impedance and regulation and control method

The invention provides a high-reliability big-work-range sensing energy taking device based on adjustable impedance. The device comprises an energy taking current transformer (energy taking CT), an adjustable impedance circuit, an AC-DC conversion circuit, a storage battery and a supercapacitor energy management module and an electricity use load. By studying the influence of the secondary side load on the energy taking effect, the mathematical relationship of the active power output by the energy taking CT and the secondary side impedance is built. A method of connecting the adjustable impedance at the secondary side in parallel is used; the obtaining of the required power output when the primary side current changes in a large range is realized through regulating the adjustable impedance. Through a parallel connection resonance mode, the energy CT primary side current threshold value lower limit is reduced; the primary side current threshold value upper limit is improved in an adjustable impedance flow divi