(20S) Triac Waveforms
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10-25-2022, 01:25 PM
Post: #1
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(20S) Triac Waveforms
The following calculations involve troide AC switches, better known as triacs. A triac is generally used as a bidirectional power switch device. James J. Davidson, the original author of the HP 25 programs states "these programs are for use with mean-absolute (also called average) responding voltmeters which are calibrated to read the rms value of a sine wave" (Davidson, 38).
The variables used in Davidson's programs are: Vs = root mean square from source VLMS = root mean square voltage VLMA = average load voltage θ = firing angle of triac in degrees (Davidson, 38) These programs have been translated to for the use of the HP 20S calculator. HP 20S Program: Triac Waveforms (59 steps) Given: Vs and θ°, calculate VLMA and VLMS Store Vs in R0 Store θ° in R1 (degrees) Press [ XEQ ] [ A ] VLMA is displayed Press [ R/S ], VLMA is displayed Given: Vs and VLMA, calculate θ° and VLMS Store Vs in R0 Store VLMA in R4 Press [ XEQ ] [ B ] θ° is displayed Press [ R/S ], VLMA is displayed Variables: R0 = Vs R1 = θ in degrees R2 = θ in radians R3 = VLMA R4 = VLMS Program Code Key Code: { Key } Code: 61, 41, A: { LBL A } Example Example 1: Inputs: θ = 75° (stored in R1), Vs = 160 (stored in R0) Results: VLMA ≈ 100.70552 VLMS ≈ 130.27094 Example 2: Inputs: VLMA = 130 (stored in R3), Vs = 160 (stored in R0) Results: θ ≈ 51.31781° VLMS ≈ 149.25534 Source Davidson, James J. "Triac Waveforms #1" and "Traic Waveforms #2" 65 Notes V3N10 December 1976. pg. 38. |
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