April 2016
Intermediate to advanced
546 pages
12h 41m
English
Content preview from Microcontroller Programming
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Appendix 7—Pulse-Width Modulation
Pulse-width modulation (PWM) is a technique frequently used by modern electronic power switches to control power input to inertial electrical devices such as DC motors, etc. Other applications include digital-to-analog conversion and communication, to cause lights to change their intensities, etc. By turning the switch between supply and load ON and OFF at high speed, the average value of voltage or current is input to the load. The longer the switch is in the ON state compared to the OFF state, the higher the power supplied to the load is.
In Chapter 11, Figure 11.5 shows a waveform where the period of the wave and pulse width are denoted by T and w, respectively. It is assumed that pulse width for falling ...
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