Multiphase DC Power Supply Interleaved Phase Control

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Solution Overview

Problem

Modern electronics require high switching frequency DC power supplies to maintain smooth output current waveforms and reduce ripple noise, especially for devices like notebook PCs with high CPU operation frequencies, but existing solutions fail to meet these demands effectively.

Innovation Solution

A multiphase DC power supply utilizing interleaved technology with three sets of parallel-connected semiconductor switches and an interleaved power phase controller to achieve a switching frequency of 1 MHz, comprising a boost power factor corrector, isolation transformer, duck switching circuit, and phase controller to manage the output of semiconductor switches operating between 110 KHz and 150 KHz.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If high switching frequency is used, then output current waveform smoothness and responsive speed are improved, but EMI requirements become harder to meet

Engineering Contradiction:

Improveresponsive speedVSAvoidEMI

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The power supply is divided into multiple independent phases (at least two phases), each operating at a lower switching frequency. The phases are interleaved in time, with each phase's switching cycles offset from the others. This segmentation allows each phase to operate at a manageable frequency while the combined output achieves an effective high switching frequency, resolving the contradiction between responsive speed and EMI compliance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs periodic switching actions across multiple phases, where each phase operates in alternating intervals. The switching cycles are arranged periodically with specific phase shifts, creating a combined waveform that effectively operates at a higher frequency than any individual phase. This periodic interleaved action achieves the desired responsive speed while keeping individual phase EMI levels acceptable.

Inventive Principle:

Principle #19Periodic action

2Manufacturing precision

If high switching frequency is used, then ripple noise is reduced, but EMI requirements become harder to meet

Engineering Contradiction:

Improveripple noiseVSAvoidEMI

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent converts the potentially harmful EMI from individual phases into a beneficial effect by interleaving the phases. The switching noise from each phase occurs at different times, and when combined, these intermittent switching actions create a smoother overall waveform with reduced ripple noise. The individual phase EMI is transformed into a collective benefit of reduced output ripple while maintaining EMI compliance.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 provides fast responsive speed, low ripple noise, and meets Electromagnetic Interference (EMI) requirements, ensuring stable and efficient power delivery.

Implementation Method 1

a boost power factor corrector to convert the AC power source to a rectified and filtered DC voltage

Methodology Applied

Scientific EffectRectification: Diode

Implementation Method 2

an isolation transformer connected to the boost power factor corrector to generate a full wave rectified DC voltage

Methodology Applied

Scientific EffectElectromagnetic Induction: Electromagnetic Induction

Implementation Method 3

a duck switching circuit consists three semiconductor switches to regulate the voltage level of the output of the isolation transformer and each generate an output of switching frequency between 110 KHz and 150 KHz

Methodology Applied

Scientific EffectSwitching:

Implementation Method 4

an interleaved power phase controller to manage the output of the semiconductor switches for a sum of 1 MHz

Methodology Applied

Scientific EffectPhase Interleaving:

Data Source

PatentUS20170294849A1Multiphase DC Power Supply with High Switching Frequency

Publication Date: 2017.10.12 CHYNG HONG ELECTRONIC CO LTD

AI summary

A multiphase DC power supply with high switching frequency of 1 MHz comprising three parallel connected three phase DC power supply. Each of the d parallel connected three phase DC power supply comprises a boost power factor corrector to convert an AC power source to a rectified and filtered DC voltage, an isolation transformer connected to the boost power factor corrector to generate a full wave rectified DC voltage having stable voltage level, a duck switching circuit consisting a first, a second and a third semiconductor switches to regulate the voltage level of the output of said isolation transformer and a phase controller to manage an interleaved phase of the output of said three semiconductor switches. The multiphase DC power supply uses interleaved power factor correction technology to successfully provide a DC power supply with high switching frequency, low ripple noise and not subject to EMI.