CURRENT DETECTION CIRCUIT FOR LOUDSPEAKER

WIPO Patent Application WO/2020/147672

A1

A current detection circuit for a loudspeaker (500), comprising a first detection resistor (RSP), a second detection resistor (RSN), a sampling selection circuit (100), an input selection circuit (200), and a processing circuit (300). One end of the first detection resistor (RSP) is connected to a first input end (SN1) of the input selection circuit (200). One end of the second detection resistor (RSN) is connected to a second input end (SN2) of the input selection circuit (200). An output end of the sampling selection circuit (100) is connected to a switch control end of the input selection circuit (200). The input selection circuit (200) is connected to the processing circuit (300). By adding the sampling selection circuit (100) and the input selection circuit (200), voltages on two ends of the corresponding detection resistors (RSP, RSN) are sampled according to the fact that potential differences of an output stage VOP and an output stage VON of a class-D audio power amplifier (400) are in different semi-periods, and the current of the loudspeaker (500) is obtained through processing, thereby detecting the current of the loudspeaker (500) without adding an anti-clipping distortion function to the class-D audio power amplifier (400).

YANG ZHIFEI (CN)
ZHANG HAIJUN (CN)
YAO WEI (CN)
DU LIMING (CN)
CHENG JIANTAO (CN)

PCT/CN2020/071720

July 23, 2020

January 13, 2020

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SHANGHAI AWINIC TECHNOLOGY CO LTD (CN)

H03F3/217

CN109546978A	2019-03-29
CN109546979A	2019-03-29
CN209184564U	2019-07-30
CN209184565U	2019-07-30
CN108989951A	2018-12-11
CN106851474A	2017-06-13
US20130223649A1	2013-08-29

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