December 2003
Intermediate to advanced
320 pages
9h 28m
English
Content preview from Analog Interfacing to Embedded Microprocessor Systems, 2nd Edition
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A well-regulated power supply, so the dissipation at any given PWM duty cycle is known
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A means to measure the supply voltage and compensate for variations
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A means to measure the output (heat and/or dissipation) and adjust the duty cycle accordingly
In a real application, there is typically some feedback from whatever is being controlled
(heater temperature, motor speed, etc.), so the software can adjust the duty cycle to com-
pensate for power-supply variations without knowing the actual power-supply value. In this
case, the power-supply voltage variation becomes another variable in the system, just like a
varying load. In some applications, it may be necessary to measure the supply. A heater
without feedback, for instance, might use a 50% duty ...
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