Switched Mode Power Amplifier Feedback Network

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Solution Overview

Problem

Conventional voltage boost circuits for DC to AC conversion often suffer from poor bandwidth, line regulation, and load regulation due to inadequate control topologies, leading to suboptimal performance in power amplification applications.

Innovation Solution

A switched mode power amplification circuit comprising an amplifier network, a DC translation stage, and a feedback network, where the amplifier network receives input voltage and provides feedback to a voltage boost circuit, incorporating an off-time multivibrator to regulate frequency and prevent inductor saturation, thereby enhancing performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If conventional control topologies (hysteretic or PWM) are used in voltage boost circuits, then the circuit structure is simple, but the bandwidth, line regulation, and load regulation are poor

Engineering Contradiction:

Improvecontrol topology structureVSAvoidbandwidth and regulation performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent implements a feedback network that samples the output voltage and feeds it back to the amplifier network. This closed-loop feedback mechanism enables the system to automatically adjust and maintain stable output voltage, significantly improving line regulation and load regulation performance compared to conventional open-loop or simple control topologies.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces conventional mechanical or simple electronic control topologies with an operational amplifier-based control system. The op-amp network provides high-gain voltage control with superior frequency response, enabling better bandwidth and regulation characteristics while maintaining electrical operation throughout the system.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Power

If voltage boost circuit is used for DC to AC conversion, then voltage amplification is achieved, but poor line regulation and load regulation result in suboptimal performance

Engineering Contradiction:

Improvevoltage amplification capabilityVSAvoidline regulation and load regulation

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The feedback network continuously monitors the boosted output voltage and adjusts the control signal to the voltage boost circuit accordingly. This closed-loop control maintains stable output voltage despite variations in input voltage (line regulation) or output current (load regulation), enabling the system to achieve both high power amplification and superior regulation performance.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent employs dynamic control through the amplifier network that can rapidly respond to changing conditions. The operational amplifier provides high-gain, fast-response voltage control that dynamically adjusts the voltage boost circuit operation to maintain optimal performance across varying load and input conditions.

Inventive Principle:

Principle #15Dynamics

3Reliability

If amplifier network with feedback is implemented, then bandwidth and regulation improve, but circuit complexity increases

Engineering Contradiction:

Improvebandwidth and regulationVSAvoidcircuit structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The control system is segmented into distinct functional modules: the amplifier network for voltage control, the feedback network for voltage sampling and signal conditioning, and the voltage boost circuit for power amplification. This modular segmentation allows each section to be optimized independently while working together to achieve superior overall performance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The feedback network acts as an intermediary between the output voltage and the amplifier network. It conditions the sampled voltage signal and provides appropriate feedback to the op-amp, enabling precise control while isolating the high-gain amplifier from direct connection to the power circuit, thus managing complexity through functional intermediation.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Reliability

If DC translation stage is added between amplifier and voltage boost circuit, then frequency stability and control improve, but number of components increases

Engineering Contradiction:

Improvefrequency stabilityVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The DC translation stage performs multiple functions: voltage level translation, frequency stability control, and impedance matching between the amplifier network and voltage boost circuit. By consolidating these functions into a single stage, the patent achieves superior frequency stability without proportionally increasing overall circuit complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8456146B2Systems and methods for switched mode power amplification

Publication Date: 2013.06.04 GOODRICH CORP

AI summary

Systems and methods for switched mode power amplification are disclosed herein. A circuit is provided comprising an amplifier network, a DC translation stage for receiving input voltage from the amplifier network and for providing an output voltage to a voltage boost circuit, and a feedback network for providing feedback from the voltage boost circuit to the amplifier network.