A Design Method of Switched-capacitor Power Converters by Employing a Ring-type Power Converter

To solve the flexibility problem in conversion modes, we propose a design method for switched-capacitor (SC) power converters by using a versatile SC converter, and derive theoretical formulas to give circuit properties such as output voltage, power efficiency, etc. According to conditions specified by a user, the proposed converter offers the circuit structure realizing a DC-DC/DC-AC/AC-DC/AC-AC mode of operation and circuit characteristics. Although most of conventional converters offer only one conversion mode, the proposed versatile converter employing a ring-type power converter can achieve four conversion modes by controlling the timing of clock pulses. Moreover, the proposed analysis technique can provide theoretical results that are more accurate than conventional techniques, because the influence of on-resistances is considered in the proposed technique, where circuit characteristics are analyzed by assuming an equivalent circuit of the converter block. The validity of circuit design and theoretical results is confirmed by SPICE simulations. The simulation results show that the proposed system can offer the specified circuit structure and its characteristics.