Shanghai Awinic Technology Co., Ltd

Zhifei Yang

Liming Du

Haijun Zhang

Jiantao Cheng

Wei Yao

Hongjun Sun

Jianing Zhou

Yongqing Qiao

A current detection circuit and method for protecting a speaker, and a chip are provided. The current detection circuit includes a current detection module and an analog-to-digital converter. The current detection module samples a current flowing through the speaker based on current mirror technology, and converts the current into a voltage to output a first voltage signal and a second voltage signal. The analog-to-digital converter converts the first voltage signal and the second voltage signal into a PDM code, to calculate a current parameter of the speaker.

Current detection circuit, chip, and current detection method used for speaker protection

A bootstrap circuit supporting fast charging and discharging and a chip. A voltage measurement module () and a switch module () are arranged, and the voltage measurement module () controls an operating state of the switch module (); during charging, under a specific condition, the switch module () is enabled to be in an on state so as to achieve fast charging of a voltage output end; and during discharging, the purpose of fast discharging is achieved by means of a second field effect transistor (MP) arranged in the bootstrap circuit.

Bootstrap circuit supporting fast charging and discharging and chip

The present disclosure provides a current detection circuit for a loudspeaker, comprising a first detection resistor RSP, a second detection resistor RSN, a sampling selection circuit, an input selection circuit, and a processing circuit. By adding the sampling selection circuitand the input selection circuit, 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 amplifierare in different semi-periods, and the current of the loudspeakeris obtained through processing, thereby detecting the current of the loudspeakerwithout adding an anti-clipping distortion function to the class-D audio power amplifier

Current detection circuit for loudspeaker

A detection circuit and an electronic device using the detection circuit are provided. The detection circuit includes a fourth branch, a fifth branch and a third energy storage unit. The fourth branch includes multiple fourth switches, and the fifth branch includes multiple fifth switches. A preset electrical signal threshold is sampled and applied to the third energy storage unit by controlling the multiple fourth switches in the fourth branch, and a voltage difference between two detection terminals of a first energy storage unit is sampled and applied to the third energy storage unit by controlling the multiple fifth switches in the fifth branch, to compare the voltage difference between the two detection terminals with the preset electrical signal threshold.

Growing community of inventors

Shanghai, China

Zhifei Yang