Modelling, simulation and experimental investigation of a new two input, series‐parallel switched capacitor converter

Abstract

A new series-parallel switched capacitor converter topology capable of operating off two independent input sources and generating target output voltage in buck or boost mode is presented. Operation principle, conversion ratios, modelling considerations in different operation modes and extensive loss analysis are derived. The converter is robust and may be operated off one or two input sources, having the ability to change conversion ratio over a wide range. The proposed model assumes that the conduction losses are proportional to the average current flowing through each of the charge pump capacitor in a switching phase. Capacitor current instantaneous waveform in the complete charge, partial charge and no charge modes are captured in simulation and experiment. Model predicted equivalent resistance, output voltage and instantaneous capacitor current waveform concur excellent with simulated and experimental values, rendering the new converter as an excellent candidate for two and single input source applications.

An Analytical Approach for Design of a Cross-Connected Fibonacci Switched Capacitor Converter

“…This is because the SCCs do not have magnetic components and it reduces their sizes and weights [11]. Up to now, various kinds of SCCs have been suggested and developed, e.g., Dickson [12,13], series-parallel [14][15][16], multilevel modular [17][18][19], Fibonacci [20][21][22], etc. The Fibonacci SCC (FSCC) can provide high boosted output with the smallest size [23][24][25].…”

Investigation of a family of dual‐output coupled/decoupled switched capacitor converter for low‐power applications

“…So, the ability to operate alternatively with battery and renewable energy sources is an important design specification of modern systems. The examples of dual input SCC is described in [13,14] In [14], summation, subtraction, halving, and negating of inputs is implemented using five separate SCCs, each composing single flying capacitor, two switches, and two diodes. The singlecircuit SCC designed by Abraham et al [14] could implement 11 VCRs with 9 switches and 5 diodes.…”

“…The examples of dual input SCC is described in [13,14] In [14], summation, subtraction, halving, and negating of inputs is implemented using five separate SCCs, each composing single flying capacitor, two switches, and two diodes. The singlecircuit SCC designed by Abraham et al [14] could implement 11 VCRs with 9 switches and 5 diodes. As well as dual input [15], dual output brings a major advantage for the design.…”

Double‐boost switched‐resonator converter

“…However, its hard-switching operation reduces the conversion efficiency and elevates generated electromagnetic interference levels. Moreover, high power density demanded in modern electronics systems is not attainable by hard-switching operation [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. For low-power on-chip applications, switchedcapacitor converter (SCC) is a suitable candidate since no magnetic element is required.…”