IMOLA | Midterm Workshop – Ghent – 15.04.2013. | J. Kundrata and A. Baric

Slide 1

Electromagnetic compatibility of

a low-profile OLED-based lighting device

J. Kundrata and A. Baric

Midterm Workshop

IMOLA | Midterm Workshop – Ghent – 15.04.2013. | J. Kundrata and A. Baric

Slide 2

Outline

The electromagnetic compatibility of lighting equipment

Large loop antenna (LLA) measurements

Coupling-decoupling network (CDN) measurements

EMC design challenges

Multi-coil inductor designs:

One-coil (1L) design

Two- (2L) and four-coil (4L) design

Inductor array designs:

Phase and antiphase inductor orientation

Conclusion

IMOLA | Midterm Workshop – Ghent – 15.04.2013. | J. Kundrata and A. Baric

Slide 3

The EMC of lighting equipment (I)

The EMC standard CISPR 15:

“Limits and Methods of Measurement of Radio Disturbance

Characteristics of Electrical Lighting and Similar Equipment”

Radiated disturbance limits in the frequency range 9 kHz to 30 MHz

Radiated disturbance limits in the frequency range 30 MHz to 300 MHz

Large Loop Antenna

measurements

Dipole antenna

measurements

Conducted disturbance limits in the frequency range 30 MHz to 300 MHz

Coupling-decoupling

network measurements

Can be replaced by

IMOLA | Midterm Workshop – Ghent – 15.04.2013. | J. Kundrata and A. Baric

Slide 4

The EMC of lighting equipment (II)

Large Loop Antenna System (three perpendicular loop antennas

D = 2 m)

Defined in CISPR 16 Annex C

f = [300 kHz, 30 MHz]

+

IMOLA | Midterm Workshop – Ghent – 15.04.2013. | J. Kundrata and A. Baric

Slide 5

The EMC of lighting equipment (III)

Coupling-decoupling network (three-port filter that decouples the

conducted RF disturbance from the external power supply and

couples it to the measurement port)

Defined in IEC 61000-4-6

Calibration in CIPSR 15 Annex B

f = [30 MHz, 300 MHz]

+

Teseq

IMOLA | Midterm Workshop – Ghent – 15.04.2013. | J. Kundrata and A. Baric

Slide 6

EMC design challenges (I)

The EM field of a loop antenna

The inductor is basically a loop antenna driven by triangular

waveform currents

The OLED cathode mirrors the antenna currents

IMOLA | Midterm Workshop – Ghent – 15.04.2013. | J. Kundrata and A. Baric

Slide 7

EMC design challenges (II)

The EM field of a matrix of OLED cells:

The radiated disturbance

The relation of neighboring cells phases

The influence of geometrical differences (substrate thickness, cell

spacing etc.)

IMOLA | Midterm Workshop – Ghent – 15.04.2013. | J. Kundrata and A. Baric

Slide 8

Multi-coil inductor designs (I)

Single layer inductor designs

The sub-coils are anti-symmetrically driven

One-coil (1L) design Two-coil (2L) design Four-coil (4L) design

IMOLA | Midterm Workshop – Ghent – 15.04.2013. | J. Kundrata and A. Baric

Slide 9

Multi-coil inductor designs (II)

Equation-based EM-field modelling

1L 2L 4L

Magnetic

field

lin

es

Radia

tion

pattern

Eff,max = -43,5 dbµV/m Eff,max = -105 dbµV/m Eff,max = -172 dbµV/m

IMOLA | Midterm Workshop – Ghent – 15.04.2013. | J. Kundrata and A. Baric

Slide 10

Multi-coil inductor designs (III)

LL-based measurements

1L

4L 2L

IMOLA | Midterm Workshop – Ghent – 15.04.2013. | J. Kundrata and A. Baric

Slide 11

Inductor array designs (I)

A 3 x 3 matrix of 2L inductors modelled by magnetic moments

Equation-based simulations of an inductor array

Randomized phase

Slightly randomized, perturbed location of inductors

IMOLA | Midterm Workshop – Ghent – 15.04.2013. | J. Kundrata and A. Baric

Slide 12

Inductor array designs (II)

Monte Carlo analysis, N = 1000

Randomized current phase and inductor position

IOLED = 240 mA (sine waveform)

IMOLA | Midterm Workshop – Ghent – 15.04.2013. | J. Kundrata and A. Baric

Slide 13

Inductor array designs (III)

Monte Carlo analysis, N = 1000

The neighboring inductors are wound symetrically (in phase)

Perturbed inductor position

IOLED = 240 mA (sine waveform)

WORST CASE

IMOLA | Midterm Workshop – Ghent – 15.04.2013. | J. Kundrata and A. Baric

Slide 14

Inductor array designs (IV)

Monte Carlo analysis, N = 1000

The neighboring inductors are wound antisymetrically

(in antiphase)

Perturbed inductor position

IOLED = 240 mA (sine waveform)

BEST CASE

IMOLA | Midterm Workshop – Ghent – 15.04.2013. | J. Kundrata and A. Baric

Slide 15

Conclusion

The CISPR 15 sets the limits on the radiated and the

conducted disturbance of the lighting equipment

The Large Loop Antenna and the Coupling-decoupling

network measurements cover the entirety of OLED module

EMC tests

The multi-coil inductor designs are more EMC-friendly than the

single-coil inductor designs

An OLED matrix with neighboring tiles inductors wound

antisymetrically has the best performance w.r.t. EMC