Search

A current clamping circuit for a series resonant DC link converter is derived by duality from a well known circuit for the parallel resonant DC link converter. This clamping circuit is capable of reducing current peaks to about 1.2-1.4 times the DC bias current. Proper control of the triggering instant eliminates irregular high current peaks common in this topology, making the pulse amplitudes uniform at the clamping value, no matter what the converter switching sequence is. A design methodology is proposed and simulated results are presented. >

Resonant DC link power conversion circuits can experience irregular current or voltage pulses due to abrupt changes in the voltage or current that excites the resonant link. This paper presents a control technique to eliminate these irregular pulses in both series and parallel resonant link converters without any additional switch or passive component, resulting in pulses with uniform amplitude. This technique is not restricted to any particular modulation strategy and leads naturally to a design methodology. Experimental results are presented. >