Smart Audio Amplifier With Internal Sensing for Speaker Protection
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Solution Overview
Problem
Conventional speaker amplifiers with speaker protection features require external sensing pins for current and voltage monitoring, increasing complexity and cost due to the need for additional components.
Innovation Solution
A smart amplifier circuit implemented as a system-on-a-chip (SOC) that monitors current and voltage internally, eliminating the need for external sensing pins by using a processor to control power output based on these measurements to prevent overtemperature and over-excursion conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external sensing pins are used for current and voltage monitoring, then speaker protection capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the current sensing, voltage sensing, amplification, and speaker protection functions into a single integrated system-on-chip (SOC). The current monitor and voltage monitor are integrated within the SOC along with the processor and amplifier elements, eliminating the need for external sensing pins and separate monitoring circuits. This integration maintains full speaker protection capability while reducing device complexity.
Solution Approach 2:
The SOC is designed as a multi-functional integrated circuit that simultaneously performs signal generation, signal amplification, current monitoring, voltage monitoring, and speaker protection control. The processor within the SOC analyzes both current and voltage measurements to determine speaker conditions and control power output, making the device universal in handling multiple functions through a single chip.
2Reliability
If external sensing pins are used for current and voltage monitoring, then speaker protection capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines the current sensing, voltage sensing, amplification, and speaker protection functions into a single integrated system-on-a-chip (SOC). The current monitor and voltage monitor are integrated within the SOC along with the processor and amplifier elements, eliminating the need for external sensing pins and separate monitoring circuits. This integration maintains full speaker protection capability while reducing device complexity.
Solution Approach 2:
The SOC is designed as a multi-functional integrated circuit that simultaneously performs signal generation, signal amplification, current monitoring, voltage monitoring, and speaker protection control. The processor within the SOC analyzes both current and voltage measurements to determine speaker conditions and control power output, making the device universal in handling multiple functions through a single chip.
3Measurement precision
If current and voltage are monitored prior to output, then speaker protection precision is improved, but device complexity increases
Solution Approach 1:
The patent implements current monitoring and voltage monitoring at the output stage of the amplifier elements, just before the amplified signal is sent to the speaker. This preliminary measurement approach allows the system to detect current and voltage levels early in the signal path, enabling accurate determination of speaker voice coil temperature and diaphragm excursion before the signal reaches the speaker, thereby improving measurement precision without requiring complex post-processing circuits.
Data Source
AI summary
An apparatus for amplifying an audio source includes a speaker and a chip. The chip includes a processor configured to generate a signal and an amplifier element configured to amplify the signal into an amplified signal. The chip further includes a current monitor configured to monitor the current of the amplified signal prior to the amplified signal being output from the chip to the speaker and a voltage monitor configured to monitor the voltage of the amplified signal prior to the amplified signal being output from the chip to the speaker. The processor of the chip is configured to control a power of the amplified signal output from the chip to the speaker based at least on the current and the voltage.