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Sine-Wave Amplitude-Modulation Concept for
Linear Behavior of Phase-Modulated Resonant
Converters
Abstract:
This paper focuses on a dc-ac resonant power converter using a special sine-wave
amplitude-modulation concept with the objective of achieving a linear input-output
behavior, low harmonic content at the output, and reduced stages number. This technique
can be applied to a wide range of resonant converters’ applications. Sine-wave generation
techniques and phase-modulation method limitations are analyzed. Alternative solutions,
such as a new predistorted phase modulator, are developed. A prototype was designed and
implemented. Presented experimental results demonstrate the effectiveness of the presented
principle.
INTRODUCTION:
converters produce high harmonic content in the output variables.
H ARD-SWITCHING
High-frequency harmonic components can cause various undesirable effects such as
losses in magnetic elements, deterioration of the signal-to-noise ratio, and interference with
nearby systems and radio reception. The search and the achievement of solutions that
present a low output spectrum content and low losses are therefore essential and has been
an important research field as can be inferred by the amount of publications dedicated to
this subject. As an example, in [1] and [2], a comparative study of spread-spectrum
pulsewidth-modulation (PWM) techniques for the conducted electromagnetic interference
attenuation in PWM converters is presented. Multilevel topologies may also be a means to
achieve lower noise content at the output [3].
Architecture Diagram:
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CONCLUSION:
This paper has focused on the general working principles and the feasibility of the SAM
principle. It has been shown that SAM allows dc-ac conversion with only two stages and
also reproducing signals with very low output spectral content. It is particularly
advantageous in isolated systems due to the lower component count. In this case, the
leakage flux transformer inductance can be part of the resonant filter inductance or,
depending on the situation, it can be the total filter inductance. The circuit operates at a
constant frequency, simplifying the circuit design. It can produce any voltage value down to
zero. An experimental prototype has been built, and results have proven the feasibility of
the SAM principle.
References:
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[email protected]
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www.frontlinetechnologies.org
[email protected]
+91 7200247247