Mixed-Signal Matrix IC Eases Control Of Three-Phase AC Systems

by Bilal Ahmed, Silego Technology, Santa Clara, Calif., How2Power Today, May 16 2017

Focus:
This article will demonstrate how to control each phase of a three-phase ac system using a Silego GreenPAK SLG46140 programmable mixed-signal matrix IC. It does this by turning on and off three TRIACs at precise time intervals that are synchronized with a corresponding ac phase. In the design presented here, the GreenPAK device controls three different- colored incandescent lightbulbs. Each TRIAC is turned on for a certain part of the ac sine wave, a technique called leading-edge cutting. This technique allows us to dim the lightbulbs by creating an ac PWM signal to reduce their duty cycle. This technique can also be used to control other types of loads. However, for inductive ac loads like fans or ac motors, the ac signal cutting must be done with care, as heavy motors behave unpredictably at low voltages.

What you’ll learn:

• How to adjust the duty cycle of three-phase ac power for control of lamps or motors
• How to implement leading-edge cutting on ac power waveforms using mixed-signal matrix ICs and TRIACs

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