Power-based thermal limits for micro-speaker protection algorithms

Peng C, Shi Y, Yan B, Wu L, Chen Z, Salvador C, Liu D. Power-based thermal limits for micro-speaker protection algorithms. In: AES Convention 148. Audio Engineering Society; 2020. Paper 594. Available from: https://aes.org/publications/elibrary-page/?id=20832

@inproceedings{Peng2020_20832,
  author = {Peng, Congcong and Shi, Yun and Yan, Bixiang and Wu, Lianjun and Chen, Zhipeng and Salvador, César and Liu, Deheng},
  title = {{Power-based thermal limits for micro-speaker protection algorithms}},
  booktitle = {AES Convention 148},
  note = {Paper 594},
  year = {2020},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=20832}
}

TY  - CPAPER
TI  - Power-based thermal limits for micro-speaker protection algorithms
AU  - Peng, Congcong
AU  - Shi, Yun
AU  - Yan, Bixiang
AU  - Wu, Lianjun
AU  - Chen, Zhipeng
AU  - Salvador, César
AU  - Liu, Deheng
T2  - AES Convention 148
M1  - Paper 594
PY  - 2020
DA  - 2020/05/06
UR  - https://aes.org/publications/elibrary-page/?id=20832
PB  - Audio Engineering Society
LA  - en
AB  - The increasing demand for high-definition audio in mobile platforms is creating the necessity of adequate operation limits for smart amplifiers to safely maximize the power delivered to micro-speakers. The maximum voice-coil temperature (Tmax) is an important parameter for protection algorithms that prevent damage. Standard tests used by micro-speaker suppliers to specify Tmax provide a conservative estimate that depends on the voice-coil materials. Other tests consider the rated noise power, a specification obtained by rigorous lifetime tests. This paper investigates the thermal limits when micro-speakers operate at their specified rated power. These power-based thermal limits are contrasted with values of Tmax specified in datasheets. The evidence found is used to recommend procedures to measure power-based thermal limits that avoid over-protection.
ER  -