Performance analysis of pulse analog control schemes for LLC resonant DC/DC converters suitable in portable applications

Performance Analysis of Pulse Analog Control Schemes, predominantly Pulse-Width Modulation (PWM) and Pulse-Position Modulation (PPM) for LLC resonant DC/DC converter suitable in portable applications is addressed in this paper. The analysis is done for closed loop performance, frequency domain performance, primary and secondary side conduction losses and soft commutation using PSIM 6.0 software and observed that PPM scheme provides better performance at high input voltage with a good selectivity of frequency over a wide range of line and load variations. The performance of LLC resonant DC/DC converter is demonstrated using PPM scheme for a design specifications of 12 V, 5 A output.