Multiphase Flyback Audio Amplifier Power Supply
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Solution Overview
Problem
Existing audio amplifier power supplies, particularly those using switched-mode power supplies, are not optimized for audio applications, leading to increased cost and size due to the need for separate power factor correction stages, which also introduce electromagnetic interference and power conversion losses.
Innovation Solution
An audio amplifier power supply with inherent power factor correction using a rectifier circuit and a discontinuous mode multiphase isolated flyback power circuit, eliminating the need for a separate power factor correction stage by distributing power conversion across multiple phases of flyback converters, thereby reducing component count and size while minimizing electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate power factor correction circuit is added to meet power factor standards, then power factor compliance is improved, but device complexity and size increase
Solution Approach 1:
The patent combines the power factor correction function with the main power conversion circuit by using a single isolated flyback converter that operates in discontinuous conduction mode. This merging eliminates the need for separate PFC and power conversion stages, reducing component count and overall device complexity while maintaining power factor compliance.
Solution Approach 2:
The isolated flyback converter is designed to perform multiple functions simultaneously: it provides power factor correction, voltage conversion, and isolation in a single circuit. This multi-functionality allows the circuit to meet power factor standards while also serving as the main power conversion stage, thereby reducing the number of required circuits.
2Reliability
If a separate power factor correction circuit is added, then power factor compliance is improved, but cost increases
Solution Approach 1:
The patent merges the PFC function with the main power conversion circuit into a single isolated flyback converter, eliminating the need for separate PFC components. This consolidation reduces the total component count, material costs, and assembly complexity, thereby lowering manufacturing costs while maintaining power factor compliance.
Solution Approach 2:
The single isolated flyback converter performs multiple functions including PFC, voltage conversion, and isolation. This multi-functionality reduces the bill of materials and manufacturing steps compared to implementing separate PFC and power conversion circuits, thus reducing overall manufacturing cost.
3Reliability
If a separate power factor correction circuit is added, then power factor compliance is improved, but electromagnetic interference increases
Solution Approach 1:
The patent combines the PFC and power conversion functions into a single isolated flyback converter operating in discontinuous conduction mode. This merging reduces the number of switching components and associated EMI sources compared to having separate PFC and power conversion circuits with their own switching elements.
Solution Approach 2:
The isolated flyback converter operates in discontinuous conduction mode with periodic switching cycles. This periodic operation with controlled duty cycles allows for predictable EMI characteristics that can be more easily filtered and managed compared to continuous switching schemes, reducing overall electromagnetic interference.
4Reliability
If a separate power factor correction circuit is added, then power factor compliance is improved, but power conversion losses increase
Solution Approach 1:
The patent merges the PFC function with the main power conversion circuit into a single isolated flyback converter. This eliminates the need for two separate power conversion stages (PFC stage and main conversion stage), thereby eliminating the redundant power conversions and associated losses that would occur in a dual-stage architecture.
Solution Approach 2:
The discontinuous conduction mode operation with periodic switching allows the inductor to fully reset between cycles, improving efficiency by reducing core losses and copper losses compared to continuous conduction mode. This periodic action optimizes the magnetic circuit operation to minimize energy losses.
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 reduced cost, size, and electromagnetic interference by eliminating the need for a separate power factor correction stage, while maintaining high power factor and efficiency in delivering peak audio power requirements with minimal heatsinking and weight.
Implementation Method 1
a rectifier circuit configured for rectifying an input voltage from an alternating current (AC) power source
Implementation Method 2
a discontinuous mode multiphase isolated flyback power circuit configured for receiving the rectified input voltage from the rectifier circuit and supplying a phase-summed direct current (DC) voltage
Data Source
AI summary
An audio amplifier is powered by a switch mode power supply optimized for audio applications. The power supply includes a rectifier circuit and a discontinuous mode multiphase isolated flyback power circuit and does not require a separate power factor correction stage. The discontinuous mode multiphase isolated flyback power circuit includes multiple isolated flyback converters operating synchronously to each convert a portion of the power and supply a phase-summed direct current voltage to the audio amplifier.