This paper presents the topology of differential switching power amplifier with power decoupling method independent of output frequency. The amplifier can achieve both power decoupling and ZVS without adding additional power switches. At low frequency, power decoupling control based on filter capacitor energy balances the fluctuating power by adjusting the common mode voltage. At high frequency, auxiliary resonant circuit creates the high-frequency current loop and provides the pre-condition for ZVS. The correctness has been verified by simulation in PLECS.