Abstract: Class E circuit has the advantages of simple structure, no shoot-through problem and high reliability. However, due to the narrow soft-switching range and limited output power of the traditional Class E circuit, it is not suitable for the variable load occasions such as battery charging. To relieve this issue, three novel Class E circuits with capacitor switching branch were proposed, which not only improved the soft-switching range and output power, but also achieved constant current and constant voltage output only by switching the branch once without changing the frequency or compensation mode. Considering the soft switching margin, the three compensation networks were accurately modeled, compared and analyzed in terms of impedance compression, high-order harmonic suppression, device parameters, capacitor stress and etc. It is concluded that the S/CL network has greater advantages. Finally, an experimental platform was built to compare S/CL and S/CLC networks, which verified that S/CL network has better constant current and constant voltage characteristics.