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PWM: The Unconventional Way to Regulate Pressure (.PDF Download)

Pulse-width modulation (PWM) has been used successfully in electronic control circuits for at least 50 years. It is an efficient method for controlling a large amount of output power while expending a relatively small amount of power in the controller itself. No matter how small, though, the sources of inefficiency in the electronic PWM circuit stem from the finite switching time of solid-state controlling devices and the finite conducting resistance of the switching device when in its on

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