Topics Covered

Introduction to solid state devices and thyristors: (i) Schottky rectifier (ii) Zener diode (iii) Diode and transistor  packages (iv) SCR and (v) TRIAC. Introduction to triggering devices: UJT, UJT relaxation oscillator, phase control circuit; Programmable UJT (PUT), PUT relaxation oscillator; Schottky diode; Silicon Unilateral Switch (SUS); DIAC; Silicon Bilateral Switch (SBS); Asymmetrical AC triggering devices. Motor Control: DC Motor braking and plugging circuits, transistor dynamic braking circuit, typical motor plugging circuit, emergency stop plugging circuit,; speed control PM/Shunt motors; electronic speed control using armature voltage control method. Solid state motor speed controller: Single transistor speed control; OP-AMP and Darlington power amplifier speed control, OP-AMP and MOSFET power amplifier control for PM/Shunt motors. SCR speed control circuits for PM/Shunt motors; simple SCR circuit, SCR plus UJT circuit variation of a pulse width modulation (PWM) speed control circuit. Speed control of series / universal motors: Series / universal motor control circuit using SCR (half wave control); TRIAC and DIAC (full wave control); TRIAC control with Hysteresis compensation, DC motor phase control; balance bridge (reversing) drive for PM or shunt motors, phase control circuit for Dc series motor. DC-DC chopper control, Basic Jones Chopper circuit. Stepper motors; stepper motors drive circuit using transistors, Darlington transistor and MOSFETs. Speed control of AC motors: Variable frequency converter block diagram, simplified single phase cycloconvereter. TRIAC control, single phase inverter, three phase six step inverter. Electronic timers. Switched mode power supplies. Voltage multipliers. Magnetic Amplifiers. Resistance welder controls. Induction heating. Dielectric heating.