Title:
CURRENT DETECTION CIRCUIT, CHIP, AND CURRENT DETECTION METHOD USED FOR SPEAKER PROTECTION
Document Type and Number:
WIPO Patent Application WO/2021/093467
Kind Code:
A1
Abstract:
The present application provides a current detection circuit, chip, and current detection method used for speaker protection; by means of a current detection module, power tube current mirroring technology is used to perform sampling of a speaker current and convert the current to a voltage so as to output a first voltage signal and a second voltage signal; the design of the circuit does not increase the power loss of a Class_D circuit. Furthermore, in combination with an analog-to-digital converter, the first voltage signal and the second voltage signal are converted into PDM codes to as to calculate to obtain the current value parameter on the speaker; the effective bits may be as high as 13 bits; even though the output power of a Class_D is very large, there is no need to increase the anti-cut top distortion function, and the magnitude of the speaker current can also be detected normally.
Inventors:
YANG ZHIFEI (CN)
ZHANG HAIJUN (CN)
DU LIMING (CN)
CHENG JIANTAO (CN)
SUN HONGJUN (CN)
ZHANG HAIJUN (CN)
DU LIMING (CN)
CHENG JIANTAO (CN)
SUN HONGJUN (CN)
Application Number:
PCT/CN2020/117346
Publication Date:
May 20, 2021
Filing Date:
September 24, 2020
Export Citation:
Assignee:
SHANGHAI AWINIC TECHNOLOGY CO LTD (CN)
International Classes:
G01R19/25; H03F3/217
Foreign References:
| CN110632381A | 2019-12-31 | |||
| CN109546979A | 2019-03-29 | |||
| CN109546978A | 2019-03-29 | |||
| EP1418667A1 | 2004-05-12 | |||
| US3976955A | 1976-08-24 | |||
| CN201312286Y | 2009-09-16 |
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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