Applications of Computer Modeling in Electromagnetic Compatibility (EMC) Tests (Part1) ESE –...
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Transcript of Applications of Computer Modeling in Electromagnetic Compatibility (EMC) Tests (Part1) ESE –...
Applications of Computer Modeling in Electromagnetic Compatibility (EMC) Tests (Part1)
ESE – Andrew Rusek
P9. Example 3: Two Cell Phone Antennas and Two Receiving Objects
Receiving Objects
Cell Phone Antennas
Grounded Object
Suspended Object
Two Cell Phone Antennas, Field Directivity for 0.8 GHz, The Same Phases
Two Cell Phone AntennasField Directivity Changes for 1.5 GHz, Opposite Phases Two Cell Phone Antennas, Field Directivity Changes
for 1.5 GHz, The Same Phases
P10. Two Cell Phone Antennas, Field Directivity for 0.8 GHz, Opposite Phases
P11. Opposite Phases The Same Phases
Grounded ObjectGrounded Object
Summary:
EMC measurements are performed to protect electrical equipment from potential interfering signals caused by uncontrolled and intentional sources. The presentation includes examples of simulated basic Controller Area Network (CAN) experiments, including conducted and radiated emissions. Simulated CAN immunity tests are also shown. In addition, results of computer simulations of EM fields generated by GHz frequency basic structures are presented. Necessity of testing GHz devices is due to high speeds of clocks of computers and signals of new cell phones. At GHz frequencies the distribution of EM fields emitted by Devices Under Test (DUT) become non-uniform. Computer simulation of experiments can be the way to reduce time required to find the DUT field directivity.
P7. Example 2: Simulated EMC Radiation Test for Three Radiating Objects
Test AntennaRadiating Objects
Field Directivity Tests for 0.6 GHz, 1.0 GHz, and 1.5 GHz
P8. Field Pattern of Three Radiating Objects (0.6 GHz) All Sources in Phase
Field Pattern of Three Radiating Objects (1.0 GHz) All Sources in Phase
Field Pattern of Three Radiating Objects (1.5 GHz) All Sources in Phase
Current Distribution in Various Segments of Test Antenna Versus Frequency. All Sources in Phase
changes of current magnitude show effects of directivity variations with frequency
Applications of Computer Modeling in Electromagnetic Compatibility (EMC) Tests (Part2)
ESE – Andrew Rusek
P1. New Electromagnetic Interference Issues Investigated at OU:
GHz frequency range interference and radiating device directivity (necessity of introduction of new EMC standards and measurement methods to recognize device directivity) Simulations helpful to detect peaks of radiation, and prepare experimentation and training
Cell phone and other wireless device interference into sensitive medical and automotive systems (Hospitals, Automobiles, etc)
GPS and other navigation instrumentation EMC problems PRESENTED: Examples of Modeling
Example 1: CISPR (EMC Standards) based conducted and radiated emissions tests;
Immunity tests. Controller Area Network (CAN) transceivers are tested (Research completed in cooperation with DaimlerChrysler)
Example 2: Simulated GHz range EMC radiation test for three radiating objects to observe field directivity effects
Example 3: Example 3: Two Cell Phone Antennas and Two Receiving Objects
P2. Example 1: Transceiver Modeling
Common-Mode Filter Structure
Mid-Layer Model of CAN TransceiverModel of CAN Transceiver with External Components
Internal Transmitter Model
Internal Receiver Model
P3.
Antenna Model for CISPR 25 Radiated Emission TestsDeveloped by Mr. W. Hall, DaimlerChrysler
CAN TransceiverTransmitting Pulses CAN Receiver
Receiving Pulses
Twisted Pair Cable
P4. Conducted and Radiated Emission Test
Simulated Conducted Emissions
Simulated Radiated Emissions
Measured Conducted Emissions
Measured Conducted EmissionsMax. freq = 5 MHz
MHz
Measured Conducted EmissionsMax. freq. = 50 MHz
P5. P6. Simulated Immunity Tests
Interrupted Communication
Interfering Signals
Interference Generator
OK signals
Transmitted Signal
Received Signal