Closed-Loop Switch-Mode Boost Converter for High-Bandwidth Signal Amplification
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Solution Overview
Problem
Conventional systems that amplify high-bandwidth signals using two-stage power converters often experience power efficiency losses due to voltage differences between the high-voltage rail and the amplified output signal, particularly when amplifying time-varying signals with high-frequency components.
Innovation Solution
A closed-loop switch-mode boost converter is introduced, which includes a switching signal generator circuit, a switch-mode boost amplifier circuit, a filter circuit, and an error amplifier circuit. This configuration generates a filtered time-varying output signal with a linear relationship to the input signal, maintaining a high-frequency component similar to the input, and eliminates the need for an intermediate high-voltage rail, thereby improving power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a two-stage power converter system is used to amplify high-bandwidth signals, then signal amplification capability is improved, but power efficiency deteriorates due to voltage differences between the high-voltage rail and the amplified output signal
Solution Approach 1:
The patent combines the functions of the first power converter (high-voltage generation) and the second power converter (signal amplification) into a single integrated switch-mode boost converter. This merging eliminates the intermediate high-voltage rail and the voltage mismatch problem that caused power efficiency losses in the two-stage system, while maintaining the capability to amplify high-bandwidth signals.
Solution Approach 2:
The single switch-mode boost converter is designed to perform multiple functions simultaneously: it generates the high-voltage rail, amplifies time-varying signals with high-frequency components, and maintains power efficiency by directly coupling the input and output through a unified control mechanism. This multi-functionality replaces the specialized two-stage architecture.
2Productivity
If an intermediate high-voltage rail is used in two-stage conversion, then signal amplification is achieved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the intermediate high-voltage rail from the system architecture. By removing this intermediate stage and its associated voltage conversion requirements, the system simplifies the overall structure while maintaining signal amplification capability through the direct single-stage boost conversion approach.
Solution Approach 2:
The patent merges the high-voltage generation function and the signal amplification function into a single integrated converter stage, eliminating the need for separate first and second power converter circuits. This consolidation reduces the number of components and simplifies the overall device structure.
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 closed-loop converter effectively amplifies time-varying signals with high fidelity and significantly reduces power efficiency losses by maintaining a linear relationship between the input and output signals, while ensuring the output has a maximum frequency component comparable to the input, thus enhancing the overall efficiency of signal amplification.
Implementation Method 1
A switch-mode boost amplifier circuit includes an input voltage node for receiving an input voltage, a switch driver input node coupled to the switching signal output node for receiving the switching signal, and a signal output node for outputting a time-varying output signal
Implementation Method 2
The filter circuit includes a filter input node coupled to the signal output node of the switch-mode boost amplifier circuit to receive the time-varying output signal, and a filter output node for outputting a filtered time-varying output signal
Data Source
AI summary
A closed-loop switch-mode boost converter includes a switching signal generator circuit, a switch-mode boost amplifier, a filter circuit, and an error amplifier circuit. The switching signal generator circuit receives an input signal and outputs a switching signal. A duty-cycle of the switching signal has a first non-linear relationship to an amplitude of the input signal. The switch-mode boost amplifier receives the switching signal and produces an output signal. An amplitude of the output signal has a second non-linear relationship to the duty-cycle of the switching signal, and the output signal has a linear relationship to the input signal based on the first and second non-linear relationships. The filter circuit receives the output signal and outputs a filtered output signal. The error amplifier circuit receives the input signal and the filtered output signal and produces a feedback control signal. The filtered output signal is adjusted based on the feedback control signal.