New voltage balance technique for capacitors of symmetrical half-bridge converter with current mode control

It is well known that the current mode control has been widely applied to DC-DC converter for providing fast dynamic response capability and over current protection. However, this feature may give voltage un- balance issue for symmetrical half-bridge converter. The main theme of this paper is to present a novel voltage balance technique for the capacitors of symmetrical half- bridge converter with current mode control. The problem of voltage un-balance for this kind of converter will be described and followed by the proposal of the novel voltage balance technique. Finally, experimental results derived from a 48 V/3.3 V DC-DC converter will be presented to fully support our claims.