Soft-switching modulator with loss-balancing capability for wireless charging systems

Abstract

The present invention discloses a soft-switching modulator with loss balancing capability for use in a wireless charging system. The soft-switching modulator includes an integrator, a multiplier and a finite state machine FSM. When the average voltage δ of the FB-SDM output is equal to z ‑1 The delayed signals are superimposed and transmitted to the integrator. The output e of the integrator is multiplied by the current direction to obtain the input u of the state machine. u is input into the finite state machine FSM to obtain S1 and S3. S1 is the driving signal of the field effect transistor T1 of the series-series compensation network topology wireless charging system structure, and S3 is the driving signal of the field effect transistor T3 of the series-series compensation network topology wireless charging system structure. By processing the redundant paths of the switching state change sequence, the soft switching operation of the wireless charging system is realized without adding any auxiliary circuits and changing the resonant frequency in the early stage, thereby improving the efficiency of the system.

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