Title:
SPEAKER DC VOLTAGE DETECTION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2018/133564
Kind Code:
A1
Abstract:
The present invention provides a speaker DC voltage detection circuit. The DC voltage detection circuit comprises: a reference signal generator configured to generate a reference signal; a first comparison circuit configured to receive a first voltage output by an audio amplifier and the reference signal; a second comparison circuit configured to receive a second voltage output by the audio amplifier and the reference signal; an OR gate having a first input and a second input respectively connected to outputs of the first comparison circuit and the second comparison circuit, respectively receiving a first modulation signal and a second modulation signal, and generating an output signal; and a counter having an input connected to an output of the OR gate and an output connected to the audio amplifier and configured to count the output signals of the OR gate to determine a detection result and lock off the audio amplifier if the detection result is abnormal. The speaker DC voltage detection circuit provided by the present invention can determine whether an DC component exists in an amplifier output voltage and whether the output signal of the amplifier output voltage is of a size that would damage the amplifier, thereby protecting a speaker and prevent the speaker from burning out.
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Inventors:
LIN QILIANG (CN)
WU SHUNDA (CN)
WU SHUNDA (CN)
Application Number:
PCT/CN2017/114584
Publication Date:
July 26, 2018
Filing Date:
December 05, 2017
Export Citation:
Assignee:
SHENZHEN ZYL SEMICONDUCTOR TECH CO LTD (CN)
International Classes:
H04R3/00
Foreign References:
| CN206533521U | 2017-09-29 | |||
| CN106658295A | 2017-05-10 | |||
| CN102685642A | 2012-09-19 | |||
| CN103176029A | 2013-06-26 | |||
| CN102013874A | 2011-04-13 | |||
| US5319714A | 1994-06-07 |
Attorney, Agent or Firm:
SHENZHEN ZHONGLIAN PATENT AGENCY CO., LTD. (CN)
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