Research Article Open Access

Simulation and Implementation of Quasi Resonant DC-DC Converter

P. Parvathy1 and N. Devarajan1
  • 1 College of Technology Electrical Engineering Coimbatore, India


Problem statement: A half-bridge LLC resonant converter with a voltage doubler rectifier has a simple structure and its Zero-Voltage-Switching (ZVS) capability is excellent from zero to full load condition. But conduction loss is more due to high circulating energy thus reducing the system efficiency. Moreover a variable frequency control method makes the control circuits more complicated than those using the Pulse Width Modulation (PWM) control method. Thus, DC drive has lower efficiency when it operates on light loads. Approach: To improve the efficiency of the DC drive under light loads, a PWM-controlled quasi-resonant converter is proposed .It has simple control circuits and less conduction loss compared to a half-bridge LLC resonant converter under light load conditions. The proposed converter has a half-bridge LLC resonant converter along with an auxiliary circuit. The load regulation of the proposed converter can be achieved by an auxiliary circuit. Thus the proposed converter is expected to be suitable sustaining power module for the efficiency enhancement of DC drives. As the magnetizing inductance of the proposed converter is larger the circulating energy is considerably reduced under light load conditions. In this study the operational principle, design and modeling of QRC DC-DC converters for DC drives are presented. The PWM controlled quasi resonant converter is implemented using PIC microcontroller 16F184A. Results: The capacitor filter in the output is replaced by pi filter to produce DC with minimum ripple. The experimental results and simulation results are compared. This converter has the advantages like reduced number of switches, reduced transformer and filter size, reduced ripple, reduced switching losses, reduced switching stresses and increased power density. Conclusion: The experimental results closely agree with the simulation results.

Journal of Computer Science
Volume 8 No. 10, 2012, 1730-1738


Submitted On: 18 April 2012 Published On: 29 August 2012

How to Cite: Parvathy, P. & Devarajan, N. (2012). Simulation and Implementation of Quasi Resonant DC-DC Converter. Journal of Computer Science, 8(10), 1730-1738.

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  • Zero voltage switching
  • DC to DC converter
  • PIC microcontroller
  • pulse width modulation