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DC voltage error protection circuit, related method and system

A technology for error protection and protection circuits, applied in sensor protection circuits, protections that react to overvoltage, transducer circuits, etc.

Active Publication Date: 2016-01-20
FAIRCHILD SEMICON SUZHOU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because some typically audible low frequency audio signals may exhibit the characteristics of a voltage signal capable of damaging the speaker, it is often difficult to prevent such voltages from being applied across the speaker

Method used

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  • DC voltage error protection circuit, related method and system
  • DC voltage error protection circuit, related method and system
  • DC voltage error protection circuit, related method and system

Examples

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example 11

[0036] In Example 11, a method may include: receiving an input signal at a first amplifier; providing an estimate of the first output signal, comparing the estimate to a threshold; activating a comparison signal when the estimate exceeds the threshold; When the signal is valid, enable the timer; when the above-mentioned comparison signal is valid for a selected time period, activate the second output signal; receive the first digital input at the timer; and set the above-mentioned selected according to the value of the first digital input. period.

[0037] In Example 12, the method of any one or more of Examples 1-11 optionally includes amplifying the input signal at the second amplifier to provide the first output signal to the load.

[0038] In Example 13, the providing an estimate of the first output signal of any one or more of Examples 1-12 optionally includes making a gain of the first amplifier track a gain of the second amplifier.

[0039] In Example 14, the tracking ...

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Abstract

This document discusses among other things apparatus and methods for protecting circuit elements from harmful voltages. In an example, an apparatus can include an amplifier configured to receive an input signal and to provide an estimate of a first output signal, a peak detector to receive the estimate and to generate a comparison signal that is active when the amplified input signal exceeds a threshold value, and a timer configured to activate a second output signal if the comparison signal is active for at least a selected time period. The timer can include a first digital input and the selected time period can be set using a state of the first digital input.

Description

technical field [0001] This application discusses, among other things, electronic circuits and, more specifically, electronic protection circuits. Background technique [0002] Mobile devices such as "smart" cell phones, MPEG-1 Audio Layer 3 (MP3) devices, Wi-Fi enabled devices, etc. have become increasingly popular due to their ever-increasing functionality and capabilities. A popular (and often required) feature that has been incorporated into most of these devices is a speaker for sound (eg, music or speech). In many cases, a connector may also be provided on the device to allow the user to connect headphones or similar for sound reproduction. [0003] A major concern for mobile device manufacturers is protecting the speakers incorporated into the device from damage caused by improper voltages placed across the speakers. A common type of damaging voltage is a direct current (DC) mode voltage of sufficient magnitude and duration to permanently damage the speaker. Becaus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00H02H3/20
CPCH04R3/007
Inventor E·希瑞尔
Owner FAIRCHILD SEMICON SUZHOU