DC-DC Converter Ripple Reduction via Parallel Amplifier and RF Trap
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Solution Overview
Problem
DC-DC converters face challenges in minimizing ripple voltage, which is undesirable and affects efficiency, while balancing cost and size considerations.
Innovation Solution
A DC-DC converter design incorporating a parallel amplifier, a radio frequency (RF) trap, and a switching supply, where the parallel amplifier regulates voltage and the switching supply regulates current to maximize efficiency, with the RF trap filtering unwanted noise at specific frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If switching supply is used to provide power, then efficiency is improved, but ripple voltage increases
Solution Approach 1:
The power supply is segmented into two independent sources: a switching supply for efficient power delivery and a parallel amplifier for ripple cancellation. Each component performs a specialized function, with the switching supply handling bulk power conversion and the parallel amplifier specifically targeting ripple reduction through feedback control.
Solution Approach 2:
The parallel amplifier acts as an intermediary between the switching supply and the load. It receives feedback about the output voltage ripple and injects a compensating signal to cancel the harmful ripple components while preserving the efficient power transfer from the switching supply.
2Measurement precision
If parallel amplifier is used to regulate voltage, then voltage accuracy is improved, but power efficiency deteriorates
Solution Approach 1:
The parallel amplifier performs only the partial function of ripple cancellation rather than providing full power regulation. By operating in this partial capacity and using feedback control to activate only when needed for ripple suppression, it achieves high voltage accuracy without continuously consuming excessive power.
3Object-generated harmful factors
If switching frequency is increased to reduce ripple, then ripple voltage is reduced, but electromagnetic interference increases
Solution Approach 1:
The harmful ripple voltage is extracted and treated as a separate signal component. The feedback circuitry isolates the ripple from the main power signal, allowing selective cancellation of only the ripple components without affecting the overall switching operation or generating additional electromagnetic interference.
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
This configuration effectively reduces ripple voltage and noise, enhancing the efficiency and accuracy of the power supply output while minimizing unwanted noise at specific frequencies.
Implementation Method 1
The RF trap has a frequency response with an RF notch at an RF notch frequency. The RF trap filters the first power supply output signal based on the frequency response.
Data Source
AI summary
A direct current (DC)-DC converter, which includes a parallel amplifier, a radio frequency (RF) trap, and a switching supply, is disclosed. The switching supply includes switching circuitry and a first inductive element. The parallel amplifier has a feedback input and a parallel amplifier output. The switching circuitry has a switching circuitry output. The first inductive element is coupled between the switching circuitry output and the feedback input. The RF trap is coupled between the parallel amplifier output and a ground.