A DC-DC system controlled by single chip, including the realization of the hardware as well as the software of the system. The chip AT89S52, chip TL494, and the A/D chip ADC0804 matching with the outside circuit realize the hardware part of the system. The software controls the PWM to generate a DC power supply ranging from 5V to 10V in condition of an input voltage ranging from 20V to 30V. The integration of two parts implements the effect of Open-loop Control and Close-loop Control.

closed_loop.c

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