Series resonance system based on impedance online identification, rapid tuning method and device

Abstract

The invention discloses a series resonance system based on impedance online identification and a rapid tuning method and device, and relates to the technical field of electric vehicle charging, and the system comprises a power supply module, an inversion module, a resonance module, an impedance identification module and a control module. The impedance identification module collects voltage and current signals of a resonance circuit in real time and calculates an equivalent impedance value, the control module determines a compensation capacitor adjustment strategy according to the deviation between the equivalent impedance value and a target impedance value, and a corresponding capacitor is connected to the resonance circuit by controlling the capacitor switching circuit to achieve rapid tuning. According to the invention, the impedance state of the system can be continuously monitored and tuning can be rapidly completed in the charging process, so that the system always works in a resonant state, and the energy transmission efficiency and operation stability of the electric vehicle charging system are improved.

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