Parallel operation of two multiple outputs flyback converter with cascaded synchronization control

Abstract

This paper describes the parallel operation of two different multiple output flyback converter. Control analogy of this converters features master-slave control. Here, two converters are classified into Low Power (LP) and High Power (HP) flyback converters. Based on specifications, flyback topology is chosen differently in two converters. Switching frequency of both converters is 100KHz. UC1846 IC is employed for generating PWM gate pulse to the main switch. Outputs of the two converters are in dc continuous and pulsed form. Pulsed outputs have two different Pulse Repetitive Frequency (PRF) configuration generated through external pulse generator card. Control interconnection of LP and HP card is explained in detail. An external synchronization circuit is provided to synchronize with other modules. Here, inbuilt EMI filter, protection circuits are employed in both converters. The main performances of both converter such as Amplitude, line and load regulation, efficiency, droop, rise and fall time, and compact in size. Both converters are placed in a common mechanical package. LP and HP Circuit is miniaturized using Hybrid Micro Technology (HMC). Simulation and experiment results are demonstrated to validate the design with realized hardware.