Reduction of the Voltage and Current Harmonics Introduced by a Single-Phase Triac AC Controller, by Means of Shunt Resistance

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This paper shows that the voltage and current harmonics introduced by a single-phase triac ac controller can be significantly reduced by shunting the triac with a fixed-value resistance. Theoretical results are given for a purely resistive load and a fixed RL load with a power factor of 0.7, to substantiate this claim.