Method and system for prolonging output retention time of circuit and series resonance equipment

The invention discloses a method and a system for prolonging the output retention time of a circuit and series resonance equipment. The voltage gain value of a series resonance circuit is associated with the ratio of the excitation inductance to the resonance inductance, specifically, the smaller the ratio of the excitation inductance to the resonance inductance is, the higher the voltage gain value is. Therefore, the series resonance circuit is set to be a circuit structure with adjustable ratio of the excitation inductance to the resonance inductance. When the circuit is in a working state,the ratio of the excitation inductance to the resonance inductance is adjusted to be larger than a first ratio threshold, the power loss of the circuit is small at the moment, and the requirement forlow power loss can be met. When the circuit enters a shutdown state, the ratio of the excitation inductance to the resonance inductance is adjusted to be smaller than a second ratio threshold, the voltage gain value is high at