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High-resolution PWM generation using DSC

Posted: 19 Sep 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Pulse width modulation? PWM? switched mode power supplies? frequency? current?

Pulse width modulation (PWM) is a basic technique for average control of voltage/current in numerous applications such as motor control, switched mode power supplies, lighting, wireless charging, audio amplifiers, and many others. This technique represents efficient method to convert one level of voltage/current to another level. The principle of pulse width modulation can be seen in this application note with an example of voltage converter. The switching network generates voltage pulses, which usually have either constant frequency and variable pulse width, or constant pulse width and variable frequency. The amplitude of voltage pulses corresponds to the value of input source voltage. The voltage pulses are further rectified and filtered to get smooth output voltage; the average value of this rectified and filtered output voltage corresponds to duty cycle of the generated voltage pulses. In applications such as heating and motor control, the voltage pulses are not rectified or filtered, but directly applied on the load.

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Originally published by Freescale Semiconductor Inc. at as "High-Resolution PWM Generation Using MC56F82xx, MC56F84xxx, MC56F823xx, and MC56F827xx DSC Families".

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