CURRENT PEAK LIMITING FOR A SERIES RESONANT DC LINK POWER CONVERTER USING A SATURABLE CORE

High frequency resonant de link power conversion circuits often experi ence irregular high peak current pulses during three phase operation a nd the pulses rise to over twice the regular pulse amplitude giving ri se to current or voltage fluctuations at the output side. This high pe ak current/voltage problem appears to be common to both series/paralle l resonant types respectively because of duality of the systems. In th is paper current peak limiting has been performed by means of a satura ble core inserted in the DC link as the resonant inductance. A simplif ied circuit limiting peak current is proposed and the resulting perfor mance of the system is investigated by means of digital simulation.