Define Pulse Position Modulation (PPM)?
My concept is not so clear about pulse positive modulation, please elaborate it.
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5 replies
gajvaddan
about 13 years ago
The PWM switching frequency has to be much faster than what would affect the load, which is to say the device that uses the power. Typically switchings have to be done several times a minute in an electric stove, 120 Hz in a lamp dimmer, from few kilohertz (kHz) to tens of kHz for a motor drive and well into the tens or hundreds of kHz in audio amplifiers and computer power supplies.
sheth_kim55
about 13 years ago
The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast pace. The longer the switch is on compared to the off periods, the higher the power supplied to the load is.
alaka
about 13 years ago
"In PPM, the position (or time of occurrence) of each pulse from some reference time is varied by an amount that corresponds to the value of the digital message symbol. Both the pulse amplitude and width are held constant.
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Pulse Position Modulation (PPM) "
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