A Novel Switch Mode Amplifier Design for Actuator Array Using MIMO Optimal Feedback Quantization

Abstract

This paper proposes a novel switch-mode power stage architecture for actuator array. When the number of actuator is large, the associated power amplifier becomes costly and bulky if each actuator is controlled by an independent amplifier. Further, the increased operational block raises power consumption and is inefficient. The proposed architecture allows sharing of the power amplifier among actuators, and thereby reducing the number of switching devices. The switching method is controlled by an MIMO optimal feedback quantization, which is designed to minimize a weighted measure of the quantization distortion. The proposed method is applied to design a class-D stereo audio amplifier (dual actuators). The control performance and cross-talk behavior are investigated.Jwu-Sheng Hu is currently a Professor in the

Control and performance evaluation of switch mode amplifier for actuator array

“…Switch mode amplifier configuration with reduced number of switches was proposed in [19]. The configuration attempts to maintain the advantage of the full-bridge topology (maximum output voltage of dc V ± ) by sharing switches by adjacent actuators.…”

“…The method proposed in this paper enables to evaluate obtainable output mean voltage of switch mode amplifier configuration described in [19], [20]. At the same time, the method provides an alternative way to control the switch mode amplifier in addition to MIMO optimal feedback quantization control proposed in [19], [20].…”

“…At the same time, the method provides an alternative way to control the switch mode amplifier in addition to MIMO optimal feedback quantization control proposed in [19], [20]. The method is using an optimization algorithm to find switching states that provide the best approximation of the required output mean voltage across each actuator.…”

“…Class D amplifiers attracted a lot of interest in recent years and the research focuses mostly on (i) design of novel amplifier topologies [6], [7], [8], [9], (ii) design of novel modulation techniques [10], [11], [12], and (iii) application of advanced control techniques in order to improve linearity, power supply rejection and noise reduction [13], [14], [15], Manuscript [16], [17], [18]. Almost all of the publications focus on the design of monophonic or stereophonic applications and only a few investigated amplifier topologies and modulation and control strategies for an array of loudspeakers (actuators) [19], [20].…”

“…Papers [19] and [20] propose switch mode amplifier configurations that reduce the number of switches per actuator. However, no evaluation on the range of obtainable output mean voltage across each actuator is provided.…”