DC-DC Converter Noise Reduction Circuit with Segmented Capacitors
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Solution Overview
Problem
DC-DC converters face challenges in fully reducing noise in both high and low frequency bands, with existing solutions often failing to effectively mitigate ripple voltage and pulse currents across the frequency spectrum.
Innovation Solution
A noise reduction circuit and element comprising multiple capacitors and inductors strategically connected between input/output lines, ground, and a switching control IC, utilizing a ferrite multilayer substrate with non-magnetic and magnetic layers to reduce high-frequency pulse currents and low-frequency noise, with capacitance and inductance configurations optimized to enhance impedance and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single capacitor is used for noise reduction, then the circuit is simple, but it cannot effectively reduce noise across both high and low frequency bands
Solution Approach 1:
The capacitance function is segmented into two capacitors with different characteristics: C1 (smaller capacitance, e.g., 0.1µF) for high-frequency noise and C2 (larger capacitance, e.g., 10µF) for low-frequency noise. This segmentation enables effective broadband noise reduction while maintaining clear functional differentiation.
Solution Approach 2:
Different capacitance values are selected for C1 and C2 to optimize their performance at different frequency ranges. The parameter variation (capacitance value) allows each capacitor to function effectively in its designated frequency band, achieving comprehensive noise reduction.
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 effectively reduces noise in both high and low frequency bands by directing pulse currents through capacitors and inductors, resulting in improved output voltage quality with reduced noise across the frequency spectrum.
Implementation Method 1
a first capacitor connected between the at least one line and the ground terminal, a second capacitor connected between the at least one line and the ground
Implementation Method 2
a first inductor connected between the ground terminal and the ground
Implementation Method 3
a ferrite multilayer substrate; a first capacitor mounted on the ferrite multilayer substrate
Data Source
AI summary
A noise reduction circuit is connected between at least one line of an input line and an output line of a DC-DC converter, a ground, and a ground terminal of a switching control IC included in the DC-DC converter. The noise reduction circuit includes a first capacitor connected between the at least one line and the ground terminal, a second capacitor connected between the at least one line and the ground, and an inductor connected between the ground terminal and the ground.