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Measurement of noise source impedance of SMPS using a two probes approach
862 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 19, NO. 3, MAY 2004
Measurement of Noise Source Impedance of SMPS
Using a Two Probes Approach
Kye Yak See, Senior Member, IEEE, and Junhong Deng
Abstract—A novel approach to determine common-mode
(CM) and differential-mode (DM) noise source impedances of
a low-power switched mode power supply (SMPS) has been
developed using a two current probes approach. The proposed
approach allows measurement of noise source impedance of a
SMPS without interrupting its normal operation. With proper
setup calibration, the proposed approach can derive an equivalent
circuit model, consisting of resistive and reactive components, to
represent the noise source impedance with reasonable accuracy.
Once the equivalent circuit model of the noise source impedance
is obtained through the measurement, the most effective filter
configuration and suitable component values for the built-in
power line electromagnetic interference (EMI) filter of the SMPS
could be designed with ease.
Index Terms—Common-mode (CM), differential-mode (DM),
EMI filter, switched mode power supply (SMPS).
I. INTRODUCTION
THE KNOWLEDGE of noise source impedance andtermination impedance of a switched-mode power supply
(SMPS) is essential in its power line electromagnetic inter-
ference (EMI) filter design [1], [2]. As typical conducted
emissions measurement setup requires a line impedance sta-
bilization network (LISN), both the CM and DM termination
impedances seen by the SMPS are well defined [3]. However,
the characteristics of CM and DM noise source impedances of
the SMPS over the EMI regulated frequency range of 150 kHz
to 30 MHz are not readily available. The major components of
CM noise source impedance are the unintentional capacitance
between the switching device and its heatsink, parasitic ca-
pacitance between the heatsink and the grounded chassis, and
parasitic capacitances between other devices or wires, which
carry pulsating voltage waveform and the grounded c
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