Investigation of Electromagnetic Field Coupling from DC-DC Buck ...

iMAPS New England 43rd Symposium & Expo

Investigation of Electromagnetic Field Coupling from DC-DC Buck Converters to

Automobile AM/FM Antennas

Patrick DeRoy, CST of America, Framingham, Massachusetts, USA Andreas Barchanski, CST AG, Darmstadt, Germany

Cyrous Rostamzadeh, Bosch, Plymouth, Michigan, USA Behrouz Abdolali, Crouse, Tehran, Iran

CST ? COMPUTER SIMULATION TECHNOLOGY |

Outline

Introduction and Motivation ? SMPS EMI CISPR25 RE Test and Nearfield Probe Measurements Buck Converter Operation and RF Current Paths

? Time Domain Waveforms, Parasitic Inductances and Loop Inductance Calculations

AM Band Noise and Mitigation

? Effect of Shielding, Electric and Magnetic Shields

Glass Antennas and Vehicle Level Measurements

? Near field coupling interaction

Computational Modeling and Analysis Summary and Q&A

CST ? COMPUTER SIMULATION TECHNOLOGY |

Modern Automobile = Complex Electromagnetic Environment

? keyless entry

? toll collect system

? garage opener

? vehicle detection

? remote for block heater ? wireless charging

? tire pressure monitoring ? car alarm

? automotive radar

GPS, Galileo, Glonass, Iridium, Globalstar

ISM band ISM band

SDARS

2m band Tetra DVB-T GSM 850/900

long wave radio AM,DRM

short wave radio AM,DRM

radio clock DCF 77

medium wave radio AM,DRM

4m band CB radio

Orbcomm FM radio

Radio DAB

LTE

UMTS

DSRC

GSM 1800/1900 LTE

Bluetooth, WLAN, Zigbee

WLAN DAB-L

Car2Car Satellite TV

A modern car contains 20-30 Antennas!

100 kHz

1 MHz

10 MHz

100 MHz

1 GHz

10 GHz

CST ? COMPUTER SIMULATION TECHNOLOGY |

Switched Mode Power Supply EMI

Power Electronics designers require a deep breadth of knowledge ? circuit design, magnetics, semiconductor devices, thermal management, control theory, PCB layout, EMI... EMI continues to be a major problem! Especially for Switched Mode Power Supply (SMPS) devices Concepts well known, yet it can still be difficult to pass EMC regulations ? and it's only getting more difficult

CST ? COMPUTER SIMULATION TECHNOLOGY |

CISPR25 Radiated Emissions Test

CST ? COMPUTER SIMULATION TECHNOLOGY |

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