This practical textbook explains the conduction of electric current through semiconductors and resistors, and the operation of diodes, transistors, silicon-controlled rectifiers
, triacs, switches, and timers.
Using two inverse parallel sensitive gate silicon-controlled rectifiers
(SCRs) as the voltage breakover triggering device allows the controlling circuit to produce a wide range of light level outputs.
The ATE is specifically designed to monitor power controlled by phase-angled fired, burst fired, or time proportioned silicon-controlled rectifiers
(SCRs) in heating applications, without requiring an external current transformer or shorting blocks.
In 2008, the US fleet consisted of around 1,000 older mechanical rigs, another 600 with silicon-controlled rectifiers
(SCRs) and direct current (DC) motors, and just 250 units employing alternating current (AC) motors.
The zero-cross versions of the triac driver optocouplers provide added protection in the form of a zero-crossing detection circuit connected to the gates of the individual Silicon-Controlled Rectifiers