Class-H Driver Power Supply Control for Rapid Load Changes
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Solution Overview
Problem
Conventional Class-H driver power sources face instability due to instantaneous drastic changes in loading, leading to belated voltage supply and unstable voltage conditions, as they rely on loading current detection for adjustments, which occurs before supply adjustments can be made.
Innovation Solution
A signal processing system utilizing a volume unit meter module and a negative feedback power source generation circuit with delay modules to detect volume changes and provide a stable output voltage ahead of loading demands, incorporating a PID controller and DC/DC power generator with a low dropout linear regulator to ensure timely and stable voltage supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If loading current detection is used to adjust power voltage, then the power source can respond to loading changes, but the voltage supply becomes unstable during drastic loading changes because the demand occurs before the supply adjustment
Solution Approach 1:
The patent introduces a delay module that delays the input signal to the VU meter by a predetermined time. This preliminary action allows the power source to anticipate loading demands before they occur, enabling the voltage supply to be adjusted in advance rather than reactively, thus preventing the instability caused by belated voltage supply during drastic loading changes
2Ease of manufacture
If conventional Class-AB driver with fixed voltage power source is used, then the design is simple, but the efficiency is poor in low-power output conditions
Solution Approach 1:
The patent employs a Class-H driver architecture that dynamically switches between multiple power supply voltages (first power supply voltage and second power supply voltage) based on the absolute value of the input signal. When the input signal is small, the driver operates at the lower first power supply voltage to improve efficiency; when the input signal exceeds a threshold, it switches to the higher second power supply voltage to maintain performance, thus achieving dynamic adaptation between simplicity and efficiency
3Loss of energy
If Class-G driver with limited power stages is used, then the efficiency is better than Class-AB, but optimal performance cannot be achieved under varying loading conditions
Solution Approach 1:
The patent implements a power source generation circuit that automatically adjusts the power supply voltage level based on the detected signal volume from the VU meter. The circuit switches between different voltage levels (first power supply voltage and second power supply voltage) according to the input signal characteristics, enabling the Class-H driver to maintain optimal efficiency across varying loading conditions by adapting the voltage parameter dynamically
Data Source
AI summary
A signal processing system and method is disclosed, applicable to environment providing voltage to Class-H driver. When using the signal processing system, the first is to detect the volume change of inputted voice and use the detection result as a power source to generate an expectation value for the circuit; the input end of the power generation circuit also adds a voltage offset in addition to the expectation value, so that the output voltage from the output end of the power generator provided to the Class-H driver is higher than a fixed value. The signal processing system and method of the present invention can adjust automatically and rapidly the output voltage signal for the power voltage provided to the Class-H driver by using negative feedback controller (such as, negative feedback loop, voltage offset and proportional integral differential (PID)) based on the detected volume change of inputted voice.