Advances in High-Precision Amplifiers—The Extra L Opposed Current Converter

Abstract

In existing half/full-bridge high-precision amplifiers, output distortion is present due to the required switch blanking time. The OCC topology does not require this blanking time but has a much higher total inductor volume compared to the half bridge. In this paper, a patented new topology is introduced that has the advantages of the OCC but with a much lower total inductor volume. The basic operation and properties of the ELOCC topology are explained including an extended optimization of the total inductor volume and an average model for control design. A prototype ELOCC current amplifier has been developed. The behavior of this prototype is in good agreement with the obtained simulation results. Even though the prototype is not fully optimized, the linearity compared to a full bridge is already impressive.Index Terms-DBI, dual-buck inverter, ELOCC, high precision, OCC, opposed current converter.

A 1 MHz Wide Bandgap Power Amplifier for High-Precision Applications

“…where M m is the modulation depth and assumed as 0.9 in this research. The calculated rms ripple current is about 66% of the estimation in [9] with a fixed ripple current assumption. Therefore, a smaller filter inductor volume is expected.…”

“…One of the disadvantages of the OCC topology is that the total inductor volume is increased due to the extra bias current to maintain the continuous current mode [8]. In [9], an extra bias inductor opposed current converter (ELOCC) is proposed to reduce the total inductor volume but the volume is not optimized yet.…”

“…In this research, the total inductor volume of ELOCC topology is modeled based on [9] but the accuracy of the model is improved by taking the rms value of the variable inductor ripple current into consideration. The total inductor volume is optimized by adapting the inductor current ripple ratio.…”

An Analysis of the Highly Linear Transfer Characteristics of Dual-Buck Converters

“…A disadvantage of the DB is that it requires 2 filter inductors and thus more volume compared to conventional PWM converters. Studies show that the total volume can be reduced by coupling of the inductors [25], by changing the configuration of the inductors [26], or by altering the configuration of the switching legs [27]. However, the total inductor volume will remain larger than conventional PWM converters by at least factor 1.5.…”

Impact of amplifier errors on position loop accuracy of high-precision moving stages

“…Current research focuses on the improvement of the performance of high-precision amplifiers, e.g. [4,5], and position control of high-precision stages, e.g. [1,6,7], independently.…”