Title :
High efficiency class AD audio amplifier for a wide range of input signals
Author :
Ginart, A.E. ; Bass, R.M. ; Leach, W.M., Jr.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
The combination of analog and switching techniques gives rise to an audio amplifier capable of producing low distortion with high efficiency. The inverter provides the power and the analog amplifier acts as an active filter creating an amplifier with overall good performance. Audio systems must exhibit good performance for a wide range of input signals in order to achieve high efficiency. In this paper, unipolar PWM control with dead-band is proposed as a technique to control the inverter, with the benefit of improving efficiency for low amplitude signals. The dead-band ensures that the inverter doesn´t operate for low-amplitude signals, avoiding unnecessary switching losses for low volume operation. Simulation results and comparisons with alternative techniques are provided
Keywords :
DC-AC power convertors; PWM invertors; active filters; audio-frequency amplifiers; switching circuits; analog techniques; audio systems; dead-band; high-efficiency class AD audio amplifier; input signals range; invertor control; low volume operation; switching losses; switching techniques; unipolar PWM control; Active filters; Audio systems; Filtering; Hardware; MOSFET circuits; Power amplifiers; Power engineering computing; Power supplies; Pulse width modulation; Pulse width modulation inverters;
Conference_Titel :
Industry Applications Conference, 1999. Thirty-Fourth IAS Annual Meeting. Conference Record of the 1999 IEEE
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-5589-X
DOI :
10.1109/IAS.1999.805990
