Circuit Analysis Accounts For Magnetic Fields
Nov 1, 2004
Ohm's law and Kirchhoff's voltage law (KVL) provide powerful tools for conventional circuit analysis (mesh analysis), but if time-varying magnetic fields...
Power Transformer Attenuates Harmonics
Oct 1, 2004
The mains of the world were constructed as a giant copper causeway to transport electricity from the generating station to our homes and factories. Today's...
Gate-Voltage Control Minimizes EMI from IGBTs
Feb 1, 2004
The power converter has high-voltage and high-current switching waveforms that generate electromagnetic interference (EMI) in the form of both conducted...
Alleviating Noise Concerns in Handheld Wireless Products
Oct 1, 2003
Power supply ICs with built-in spread-spectrum switching alleviate harmonic interference with sensitive RF circuitry in battery-powered wireless products....
Power Converter Synthesis Part 3: Near Zero Emissions
May 1, 2003
Part 1 and 2 of this series describe synthesis methods that achieve improved EMC properties for nonisolated converters. In this part, let's apply similar synthesis methods to isolated full- and half-bridge circuits....
Spread Spectrum ICs Cut EMI
Feb 1, 2003
Conducted and radiated EMI emissions from switchmode power supplies can create havoc with nearby electronic systems. Alliance Semiconductor has developed a lower cost all-electronic approach for EMI suppression - spread spectrum modulation of the power supply's PWM signal....
SPICE Conducts EMI Analysis
Jan 1, 2003
When designing a switchmode power supply, the input EMI filter is often considered the most difficult part because simple means are missing to predict...
DC-DC Converters Suppress EMI: Minimizing EMI at its Source
Dec 1, 2002
Higher current demands and higher operational speeds are placing greater demands that switching power supply EMI be suppressed at its source before it is allowed to propagate into other circuits and systems....
H-Field Probes Spot Switchmode Supply EMI
Sep 1, 2001
A set of H-field probes and an oscilloscope locate and identify troublesome magnetic field sources of EMI in switchmode supplies....
