START_UP_CONTROL

Published:2009/7/14 4:43:00 Author:May | From:SeekIC

Simple, smooth start-up circuit for phase-locked oscillator maintains synchronism with AC line despite presence of large transients, and maintains phase-angle limits as required for controlling firing angle of SCR. Article describes how two separate loops are used in circuit to achieve required locking with line. Values of R6, R7, R8, C5, and C6 are chosen to meet system response time, Other unmarked values depend on operating factors; for 60-Hz line and 6X frequency multiplication by VCO, typical values are R1 39K, R2, 27K, R3 47K, C1 0.1μF, and C2 0.22μF.-J. C. Hanisko, Five IC's Make Ainsworth Oscillator with Start-Up Control, EDN Magazine, March 5, 1977, p 113 and 115.



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