Register to reply

Integral of full-wave rectified sinewave, find equivalent sine waveform

Share this thread:
gfgray
#1
Sep30-08, 12:28 PM
P: 1
1. The problem statement, all variables and given/known data
I am given two waveforms (a square wave and DC) that define the maximum allowable operating parameters for an LED. I wish to derive the maximum allowable fully-rectified sine waveform (120hz).
Square wave: 442mW peak, 0.1ms pulse width, 10% duty cycle
DC: 87mW

See attached PDF. Use the power on the right axis instead of current on the left. Also ignore the temperature stuff. I was trying to figure out why the energy for each waveform is different.

Here is a link to the actual spec sheet:
http://marktechopto.com/pdfs/Cree/LO...%2003DEC07.pdf

This is a two-part question. First, how do I write the integral for the full-wave rectified sine? Note that the sinewave's x-axis intersection is advanced/delayed by ~1.12ms. Integrate from 0 to pi?

Second, how do I deal with the fact that the total energy for the given waveforms is different? Or is this unsolvable?

2. Relevant equations

3. The attempt at a solution
See PDF.
Attached Files
File Type: pdf Pulse Width Calculations 09-30-2008.pdf (659.5 KB, 11 views)
Phys.Org News Partner Science news on Phys.org
Experts defend operational earthquake forecasting, counter critiques
EU urged to convert TV frequencies to mobile broadband
Sierra Nevada freshwater runoff could drop 26 percent by 2100

Register to reply

Related Discussions
Half wave bridge rectifier - Sine wave Amplitude problem Engineering, Comp Sci, & Technology Homework 3
RMS of Fullwave rectified sine wave. Calculus & Beyond Homework 3
Multimeter measuring full-wave rectified DC current? Introductory Physics Homework 7
Help! Full Wave Bridge Introductory Physics Homework 1
Is this a sine wave? General Discussion 5