Patent ID: 10243450

Abstract:
A flyback converter (21) for use in a power supply for an electric actuator system comprises a snubber circuit with a snubber capacitor (23) for accumulating energy stored in a leakage inductance of a flyback transformer (4) when a primary current (Iprim) is switched off. The snubber circuit further comprises a controllable switching element (24) in series with the snubber capacitor (23) with a control terminal connected to a voltage reference. The controllable switching element (24) can be in a conducting mode when the snubber capacitor voltage exceeds the reference voltage. In this way, the leakage inductance energy can be transferred to the secondary side instead of being dissipated in a resistor in the snubber circuit. This increases the power efficiency of the converter and reduces electromagnetic interference. At the same time, the solution is very simple and can thus be implemented at a low cost.