Voltage Converter Switching Masking for Resonance Interference
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Solution Overview
Problem
Voltage converters on printed circuit boards experience resonance interference due to parasitic capacitance, which affects switching signals and can cause malfunctions, especially when multiple converters share common terminals, leading to irregular functions and output voltage ripples.
Innovation Solution
Incorporating a masking circuit in voltage conversion devices to detect and mask the switching signals of other devices with common nodes, using either fixed or dynamically adjusted masking times to prevent resonance interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple voltage converters share common terminals (ground, power supply), then power supply efficiency is improved, but resonance interference increases and causes malfunction
Solution Approach 1:
The masking circuit acts as an intermediary between the feedback controller and the driving circuit. It receives the switching signal from the feedback controller and selectively masks portions of it based on detected resonance interference from other voltage converters sharing common terminals, thereby protecting the system while maintaining the efficiency benefits of shared terminals
2Power
If load current of voltage converter increases, then power conversion capability is improved, but resonance interference becomes more severe
Solution Approach 1:
The masking circuit performs preliminary anti-action by detecting resonance interference in advance and preemptively masking the switching signal during periods when interference is detected. This prevents the resonance interference from causing malfunction, allowing the voltage converter to operate at higher load currents without being limited by interference issues
3Productivity
If switching operation frequency increases, then power conversion efficiency is improved, but resonance interference at switching points increases
Solution Approach 1:
The masking circuit serves as an intermediary that monitors the switching signal for resonance interference characteristics and selectively blocks affected portions. This allows high-frequency switching operations to continue for efficiency while preventing resonance-induced malfunctions from propagating through the system
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 masking circuit stabilizes the voltage conversion function by preventing resonance interference, maintaining steady-state operation and reducing output voltage ripples.
Implementation Method 1
there is often resonance interference at the switching point of the switching signal
Implementation Method 2
the voltage converter will be affected by the parasitic capacitance in the printed circuit board and power transistor
Data Source
AI summary
A voltage conversion device, a power supply system, and an interference suppression method are provided. The voltage conversion device includes a first input terminal, a feedback controller, a masking circuit, and a driving circuit. The feedback controller provides a switching signal according to a feedback voltage. The feedback voltage is generated based on an output voltage of the voltage conversion device. The masking circuit generates a processed switching signal by masking a part of time period of the switching signal according to one of another switching signal and another switching terminal signal of another voltage conversion device. The driving circuit provides the output voltage according to a first input voltage and the processed switching signal.