JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
Online ISSN : 1349-838X
Print ISSN : 0019-2341
ISSN-L : 0019-2341
Harmonic Characteristics of the Continuous Dimmer Circuit for the Incandescent Lamp
Michio IemuraSumio MaedaJunichi Yamaguchi
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1986 Volume 70 Issue 10 Pages 537-544

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Abstract

This research relates to the harmonic characteristics of the continuous dimmer circuit for the incandescent lamp. The research has been conducted in the following sequence.
When the firing angles caused by the TRIAC are varied on the main voltage of the input terminal, Fourier series are developed on the voltage and current of a distorted wave at each element of the continuos dimmer circuit. And with the Fourier expansion, each harmonic character at each element of the continuous dimmer circuit is theoretically obtained, and the experiment is performed to demonstrate it.
(1) From the voltage and current of a distorted wave at each element of the continuous dimmer circuit, the vector diagram is obtained for the harmonic of each firing angle, and their characteristics are clarified.
(2) From the voltage and current of a distorted wave at each element of the continuous dimmer circuit, the impedance (i. e., its resistance and reactance component) is obtained for the harmonic of each firing angle, and their characteristics are clarified.
(3) From the voltage and current of a distorted wave at each element of the continuous dimmer circuit, the equivalent circuit is obtained for each harmonic, and their characteristics are clarifvied.
(4) From the voltage and current of a distorted wave at each element of the continuous dimmer circuit, the effective power and reactive power are obtained for the harmonic of each firing angle, and the effective power, reactive power, apparent power, and distorted power at each element are obtained and their characteristics are clarified.
(5) The research is made to improve the power factor in the power circuit by using condensers for the harmonic of each firing angle.

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