Zero voltage fired, transformer coupled thyristor power control applied for temperature control of the tin bath in the float glass process

Abstract

A novel thyristor-based power circuit is described which substitutes zero-voltage fired, time proportioning control, and thus allows fewer transformer taps while causing no degradation of circuit power factor. In addition, harmonic distortion usually associated with phase angle control in this application is also eliminated. A system description outlining power requirements, a comparison of power factor costs, and system design philosophy is provided, along with some operational history and an explanation of the thyristor control.<>