Abstract: The series connection technology of power semiconductor devices is one of the effective ways to achieve high-voltage applications. However, the dynamic voltage imbalance between the series devices is the main constraint of the series technology. In this paper, the turn-off behaviors of the series-connected voltage imbalance are analyzed and the mechanism of the imbalance voltage is obtained. Then, a voltage balancing circuit for series-connected silicon carbide metal-oxide-semiconductor field-effect transistor (SiC MOSFET) based on active clamping is proposed. It detects the voltage imbalance and clamps the peak voltage of the series devices by the active clamping circuit, and then controls the gate charge and switching transient behavior of the devices by feedback circuit, so as to realize voltage balancing during the turn-off process. There is no adjusted switching cycle with voltage imbalance in the method, which can realize series voltage balancing in each switching cycle even under the alternating load. Furthermore, the circuit principle and parameter design of the proposed method are introduced, and the effectiveness of the voltage balancing method is verified by experiment. The proposed method retains the strong expansibility of the active clamping circuit, which is an auxiliary circuit independent of the original gate driver. Moreover, there are no programmed logical chips or additional signal isolation in the control circuit.