publication . Article . 2014

Constant Switching Frequency Self-Oscillating Controlled Class-D Amplifiers

Khiem Nguyen-Duy; Arnold Knott; Michael A. E. Andersen;
Open Access
  • Published: 01 Jan 2014 Journal: Elektronika ir Elektrotechnika, volume 20 (issn: 1392-1215, eissn: 2029-5731, Copyright policy)
  • Publisher: Publishing House Technologija
  • Country: Denmark
Abstract
The self-oscillating control approach has been used extensively in class-D amplifiers. It has several advantages such as high bandwidth and high audio performance. However, one of the primary disadvantages in a self-oscillating controlled system is that the switching frequency of the amplifier varies with the ratio of the output voltage to the input rail voltage. In other words, the switching frequency varies with the duty cycle of the output. The drop in the frequency results in lower control bandwidth and higher output voltage ripple, which are undesirable. This paper proposes a new self-oscillating control scheme that maintains a constant switching frequency ...
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ACM Computing Classification System: Hardware_INTEGRATEDCIRCUITS
free text keywords: Electrical and Electronic Engineering, Power amplifiers, Frequency control, Voltage control, Power electronics, 0-10 V lighting control, Loop gain, Frequency multiplier, Amplifier, Power bandwidth, Switching time, Automatic frequency control, Engineering, business.industry, business, Frequency response, Control theory
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