TY - GEN
T1 - Improving the efficiency of class-D audio amplifier systems using envelope tracking DC-DC power supplies
AU - Bakker, Robert
AU - Duffy, Maeve
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/4/18
Y1 - 2018/4/18
N2 - This paper presents the use of envelope tracking in class-D digital audio amplifiers supplied through step-up DC-DC converters as applied in automotive, battery-operated, and portable devices. It is shown that envelope tracking offers significant improvements in efficiency of up to 26% for the class-D stage of a 100 W amplifier in a typical usage scenario, with a corresponding overall system improvement of up to 27% including a boost converter. Detailed simulation results of the complete system are presented, as well as experimental results performed on an existing 100 W class-D amplifier design. Efficiency versus power results are combined with music power distribution profiles to simulate typical usage cases. Challenges relating to envelope tracking and DC-DC converter control are discussed. It is concluded that there is significant potential for envelope tracking to provide improvement over the standard fixed supply amplifier design - especially at low power, where the amplifier is normally used most.
AB - This paper presents the use of envelope tracking in class-D digital audio amplifiers supplied through step-up DC-DC converters as applied in automotive, battery-operated, and portable devices. It is shown that envelope tracking offers significant improvements in efficiency of up to 26% for the class-D stage of a 100 W amplifier in a typical usage scenario, with a corresponding overall system improvement of up to 27% including a boost converter. Detailed simulation results of the complete system are presented, as well as experimental results performed on an existing 100 W class-D amplifier design. Efficiency versus power results are combined with music power distribution profiles to simulate typical usage cases. Challenges relating to envelope tracking and DC-DC converter control are discussed. It is concluded that there is significant potential for envelope tracking to provide improvement over the standard fixed supply amplifier design - especially at low power, where the amplifier is normally used most.
KW - Audio amplifier
KW - Class-D
KW - Efficiency
KW - Envelope Tracking
KW - Pulse-Width-Modulation (PWM)
UR - https://www.scopus.com/pages/publications/85046941613
U2 - 10.1109/APEC.2018.8341044
DO - 10.1109/APEC.2018.8341044
M3 - Conference Publication
AN - SCOPUS:85046941613
T3 - Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
SP - 412
EP - 418
BT - APEC 2018 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018
Y2 - 4 March 2018 through 8 March 2018
ER -
