Hybrid control scheme for mitigating the inherent DC‐current in the transformer in buck‐boost full‐bridge converter for an all‐electric motor drive system

Abstract

A buck-boost full-bridge topology is preferred for low-input voltage, high gain, high-power battery fed front-end converter of an all-electric motor drive system. Variants of this topology feature high direct current (DC)-gain, soft switching, continuous input and output currents with a phase modulation/asymmetrical pulse width modulation (PWM) scheme. These variants exhibit a high-magnitude DC-current in the transformer primary winding for low-input voltage, high-power application leading to poor core utilisation and low-power density of the system. The operation and analysis of the converter are presented to highlight the DC-current in the transformer and to mitigate this, a hybrid control scheme (HCS) is proposed. The proposed HCS consists of a DC-current compensation (DCCC) loop to mitigate the DC-current in the transformer without altering the DCgain with no additional components and output regulation (REG) loop to regulate the output. The output REG and DCCC loops are independent of each other. Soft switching is retained with this proposed scheme. The necessity to mitigate the DC-current, analysis, and implementation of the HCS is discussed. The verification of the proposed HCS scheme in simulation and the experimental prototype is presented.

Delay Mismatch Insensitive Dead Time Generator for High-Voltage Switched-Mode Power Amplifiers

“…E FFICIENCY and reliability in high-voltage (HV) electronic systems are major concerns, especially in critical applications such as those found in the automotive and aviation industries [1], [2], [3]. Recent developments in Manuscript received 10 September 2022; revised 5 December 2022; accepted 19 December 2022.…”

“…Owing to the high efficiency of the switched-mode amplifier topologies, such as class-D power amplifiers, they play a key role in many applications such as audio amplifiers, motor drivers, constant power supplies, and piezo-electric actuator drivers [1], [2], [6], [7], [8]. Even though the theoretical efficiency of switched-mode PAs can be close to 100%, practically, there are several sources of power losses that degrade their efficiency.…”