Filterless Audio Power Amplifier With Conductive Enclosure Cooling
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Solution Overview
Problem
Existing audio power amplifiers are inefficient, large, and prone to overheating due to inadequate heat dissipation, which limits their application in compact spaces and introduces distortion and noise issues, particularly in Class D amplifiers that require large LC filters and proprietary IC chips.
Innovation Solution
A compact audio power amplifier design with a Super Class D Power Amp using dual parallel switching amplification circuits that eliminate the need for LC filters, employing direct heat sinking to a conductive enclosure for efficient heat dissipation and reducing distortion through identical triangle references, allowing for smaller form factors and broader power range applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Class D amplifiers use LC filters to remove PWM square waves at the output, then the output signal quality is improved, but the amplifier size increases and efficiency decreases
Solution Approach 1:
The patent extracts and removes the LC filter components from the amplifier circuit. By using a bridge-tied load (BTL) configuration with complementary push-pull output stages, the design eliminates the need for external LC filters to remove PWM square waves, thereby reducing amplifier size while maintaining output signal quality through the inherent differential output structure.
Solution Approach 2:
The patent merges the filter function into the output stage architecture itself. The BTL configuration with complementary transistors inherently performs the filtering function through its differential output structure, combining the power amplification and signal conditioning functions into a single integrated stage without requiring separate LC filter components.
2Measurement precision
If Class D amplifiers use LC filters to remove PWM square waves, then output signal quality is improved, but heat generation increases and efficiency decreases
Solution Approach 1:
The patent extracts and removes the heat-generating LC filter components from the circuit. The BTL configuration with complementary push-pull output stages eliminates the need for external filters, thereby removing the source of excessive heat generation and improving overall amplifier efficiency while maintaining output signal quality.
Solution Approach 2:
The patent converts the potentially harmful PWM square wave output into a beneficial differential signal structure. The complementary push-pull BTL configuration transforms the high-frequency switching output into a balanced differential signal that inherently rejects common-mode noise and eliminates the need for additional filtering, turning what would be a harmful artifact into a useful feature.
3Volume of stationary object
If proprietary IC chips are used to achieve filterless operation, then amplifier size is reduced, but cost increases and power range is limited
Solution Approach 1:
The patent segments the amplifier into modular functional blocks using discrete components. By dividing the circuit into separate stages (input stage, error amplifier, output stage) that can be independently configured, the design allows for flexible power range selection and easier manufacturing without proprietary IC constraints, while maintaining the compact filterless architecture.
Solution Approach 2:
The patent creates a universal amplifier architecture that can be configured for different power ranges using the same basic circuit topology. The BTL configuration with complementary transistors serves multiple functions across different application scenarios, eliminating the need for proprietary IC chips and allowing a single design to serve multiple power requirements from low to high wattage applications.
4Reliability
If conventional heat dissipation methods are used, then amplifier reliability is improved, but amplifier size increases
Solution Approach 1:
The patent merges the heat dissipation function with the structural enclosure. By integrating thermal management into the amplifier's mechanical housing through direct thermal coupling and optimized heat paths, the design achieves reliable heat dissipation without requiring additional external heat sinks or ventilation components, thereby maintaining compact dimensions while ensuring operational reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves a significant reduction in size and heat generation, improving efficiency and reliability, enabling the amplifier to operate in tight spaces while maintaining high power output and reducing distortion and noise, with the ability to handle various power ranges and frequency applications without proprietary components.
Implementation Method 1
a thermal conductive enclosure (307) without openings for ventilation... at least one thermal conductive component or layer that transfers heat from the components on the at least one flat surfaces of the circuitry on the circuit board to the inner surface of the thermal conductive enclosure (307) with the at least one component or layer by direct contact
Data Source
AI summary
This invention provides compact Power Amplifiers with improved efficiency of the circuitry and improved heat dissipation, together achieved much smaller enclosure size for use in modern installations requiring reduced height such as between the thin flat TV and wall, under the table or on the projector pole or in ceiling box and the like.