Speaker Load Detection Circuit Without ADC or DAC Integration
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Solution Overview
Problem
Conventional load detection devices for audio amplifier systems have a larger circuit area, making it difficult to integrate them with amplifiers due to the inclusion of analog-to-digital and digital-to-analog converters.
Innovation Solution
A load detection device comprising a signal output circuit, reference voltage generation circuit, comparison circuit, sensing circuit, detection circuit, and logic circuit, which generates forced currents and compares output signals to determine the load state of a speaker without requiring analog-to-digital or digital-to-analog converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional load detection device includes analog-to-digital converter and digital-to-analog converter, then detection accuracy is improved, but circuit area increases
Solution Approach 1:
The patent extracts and removes the analog-to-digital converter and digital-to-analog converter from the load detection device. By eliminating these converter components, the circuit area is significantly reduced while the detection function is maintained through direct digital signal processing pathways.
Solution Approach 2:
The amplifier's existing digital signal processing circuits are made to serve dual functions: both audio amplification and load detection. The same digital circuits process both the audio signals and the detection signals, eliminating the need for separate converter circuits and reducing overall circuit area.
2Adaptability or versatility
If conventional load detection device includes analog-to-digital converter and digital-to-analog converter, then signal conversion capability is improved, but integration difficulty with amplifier increases
Solution Approach 1:
The patent merges the load detection function with the amplifier's existing digital signal processing architecture. By combining these functions into a unified digital processing framework, the number of separate components is reduced, circuit interconnections are simplified, and integration with the amplifier becomes much easier.
Solution Approach 2:
The amplifier's digital circuits are designed to perform multiple functions including both audio processing and load detection. This multi-functionality approach eliminates the need for separate dedicated converter circuits, reducing overall system complexity and facilitating easier integration.
Data Source
AI summary
A load detection device includes a signal output circuit, comparison circuit, sensing circuit, detection circuit, logic circuit, and control circuit. The signal output circuit outputs a forced current, and generates a bias signal, a first output signal, a second output signal, and a feedback signal depending on the forced current. The comparison circuit compares the reference signal output with the first and second output signals to generate an accurate comparison output for indicating the load state. The sensing circuit generates a sensing signal according to the feedback signal. The detection circuit generates a rough detection output for indicating the load state according to the sensing signal and the first and second output signals. The logic circuit obtains the load state according to the precise comparison output and the rough detection output. The control circuit enables the signal output circuit, comparison circuit, sensing circuit, and logic circuit.