A Switched-Capacitor Inverter Using Series/Parallel Conversion with Inductive Load


A new switched-capacitor inverter is prepared. The prepared inverter outputs larger voltage than the input voltage by change the capacitors in series and in parallel. The highest output voltage is driven by the number of the capacitors. The prepared inverter, which does not need any inductors, can be smaller than a normal two-stage unit which happen of a boost converter and an inverter bridge.


Switched-Capacitor Inverter Its output frequency are decreased compared to a normal voltage source single phase full bridge inverter. In this paper, the circuit configuration, the logical operation, the simulation results with MATLAB/ SIMULINK, and the experimental results are shown. The experimental results give with the logical calculation and the simulation results.


  1. Charge pump
  2. Multicarrier PWM
  3. Multilevel Inverter
  4. Switched capacitor (SC)



Fig. 1. Circuit topology of the switched-capacitor inverter using series/ parallel conversion.




Fig. 2. Simulated voltage waveforms of the proposed inverter (n = 2) designed for high power at 4.50 [kW], switching frequency f = 40 [kHz] and reference waveform frequency fref = 1 [kHz]. (a) Bus voltage waveform vbus and (b) the output voltage waveform vout.


Fig. 3. Simulated current waveforms of the capacitor iC1 in the proposed inverter (n = 2).(a) Designed for low power at 5.76 [W] and (b) designed for high power at 4.50 [kW].


Fig. 4. Simulated spectra of the bus voltage waveform of the proposed inverters (n = 2) normalized with the fundamental component. (a) Designed for low power at 5.76 [W] and (b) designed for high power at 4.50 [kW].


Fig. 5. Simulated bus voltage waveforms vbus and the voltage waveforms of the load resistance vR of the proposed inverter (n = 2) designed for low power at 5.76 [W] with an inductive load.


In this paper, a novel boost change-capacitor inverter was prepared. The circuit topology was produce. The modulation method, the decision method of the capacitance, and the loss calculation of the proposed inverter were shown. The circuit operation of the proposed inverter was proved by the simulation results and the experimental results with a resistant load and an inductive load.


Switched-Capacitor Inverter The prepared inverter outputs a larger voltage than the input voltage by change the capacitors in series and in parallel. The inverter can operate with an inductive load. The structure of the inverter is simpler than the normal change-capacitor inverters. THD of the output waveform of the inverter is reduce compared to the normal single phase full bridge inverter as the normal multilevel inverter.


[1] H. Liu, L. M. Tolbert, S. Khomfoi, B. Ozpineci, and Z. Du, “Hybrid cascaded multilevel inverter with PWM control method,” in Proc. IEEE Power Electron. Spec. Conf., Jun. 2008, pp. 162–166.

[2] A. Emadi, S. S. Williamson, and A. Khaligh, “Power electronics intensive solutions for advanced electric, hybrid electric, and fuel cell vehicular power systems,” IEEE Trans. Power Electron., vol. 21, no. 3, pp. 567–577, May 2006.

[3] L. G. Franquelo, J. Rodriguez, J. I. Leon, S. Kouro, R. Portillo, and M. A. M. Prats, “The age of multilevel converters arrives,” IEEE Ind. Electron. Mag., vol. 2, no. 2, pp. 28–39, Jun. 2008.

[4] Y. Hinago and H. Koizumi, “A single phase multilevel inverter using switched series/parallel DC voltage sources,” IEEE Trans. Ind. Electron., vol. 57, no. 8, pp. 2643–2650, Aug. 2010.

[5] S. Chandrasekaran and L. U. Gokdere, “Integrated magnetics for interleaved DC–DC boost converter for fuel cell powered vehicles,” in Proc. IEEE Power Electron. Spec. Conf., Jun. 2004, pp. 356–361.


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