MULTI-LEVEL VOLTAGE-SHARING RESONANT ZERO-CURRENT SOFT-SWITCHING DC-DC CONVERTER

摘要

A multi-level voltage-sharing resonant zero-current soft-switching DC-DC converter, which is composed of a direct-current voltage-sharing capacitor bank and two-port DC-DC resonant soft-switching conversion units connected to capacitors in the direct-current voltage-sharing capacitor bank. For the converter with the number of levels being (m + 1) (m is an integer greater than or equal to 2, same below), the direct-current voltage-sharing capacitor bank is composed of m direct-current voltage-sharing capacitors (Cm, C(m - 1),..., C2, and C1) which are sequentially connected in series from top to bottom, and the potentials of the various capacitors (Cm, C(m - 1),..., C2, and C1) in the direct-current voltage-sharing capacitor bank are sequentially lowered from top to bottom. At least (m - 1) two-port DC-DC resonant soft-switching conversion units are connected to various capacitors in the direct-current voltage-sharing capacitor bank. The converter realizes voltage self-balancing for a capacitor. All switching tubes and diodes realize zero-current switching. Various two-port DC-DC resonant soft-switching conversion units operate independently without affecting one another. The whole converter system has the characteristics of structure modularization and a simple control mode.