Abstract
Power converters are known to generate spectral
components in the range of interest of electromagnetic
compatibility measurements. Common approaches to manipulate
some selected components in these frequency ranges
are shown here. These approaches add components to the
input signal of the modulator to derive a slightly varied
spectrum. To achieve a rectangular output signal, those
modulators use a triangular or saw tooth carrier signal. A
novel family of modulators is shown here, using more than
one carrier signal to obtain a completely changed spectrum
while maintaining the rectangular shaped waveform at the
output.
The multiple carriers are fed into multiple comparators and
their outputs are intelligently combined by logic gates to
get a single signal to drive one power stage of any type
of converter. This commutation distinguishes between the
four members of the novel family: the first one uses an orgate
to combine the signals; the second one utilizes therefore
an and-gate. The third modulator combines the outputs of
those two and switches between the or-output and the andoutput
after each pulse. The last described modulator is
commutating one of the described outputs dependent on the
state of a master clock.
The nonlinear operation of all modulators is described
with nonlinear algebra in conjunction with Boolean algebra.
The benefits for electromagnetic compatibility of the new
schemes are presented, all modulators are examined in
terms of steady state operation, dynamic behavior, maximum
modulation range and added distortion. Finally the implementation
of one of the modulators in a switch-mode power
supply is presented. Experimental results are verifying the
simulation.
Original language | English |
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Title of host publication | 2008 IEEE 39th Annual Power Electronics Specialists Conference |
Publisher | IEEE |
Publication date | 2008 |
Pages | 1618-1624 |
ISBN (Print) | 14-24-41667-1 |
DOIs | |
Publication status | Published - 2008 |
Event | 39th IEEE Annual Power Electronics Specialists Conference - Rhodes, Greece Duration: 15 Jun 2008 → 19 Jun 2008 Conference number: 39 http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4591877&tag=1 |
Conference
Conference | 39th IEEE Annual Power Electronics Specialists Conference |
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Number | 39 |
Country/Territory | Greece |
City | Rhodes |
Period | 15/06/2008 → 19/06/2008 |
Internet address |
Keywords
- Modulation
- Electromagnetic compatibility
- Pulse width modulated power converters