DESIGN AND DEVELOPMENT OF THREE PHASE SPWM MOVEMENT CIRCUITS USING AT89C51 MICROCONTROLLER
DOI:
https://doi.org/10.33019/ecotipe.v3i1.25Keywords:
SPWM, AT89C51 Microcontroller, PEROMAbstract
The use of grid voltage source (PLN) produces single speed value (maximum speed) of motor because grid voltage’s frequency is constant 50Hz. Therefore, a three-phase frequency converter is used to convert dc voltage into ac voltage variable-frequency variable-voltage. The dc voltage is obtained from rectified grid ac voltage using rectifier. A three-phase variable-frequency signal generator is needed as control signal for the inverter. The use of personal computer to produce this signal is not practical and economical, while using operational amplifier as phase-shifter produces inconstant phase-shift angle at any frequency interval. In this paper, a Flash PEROM (Programmable Eraseable Read Only Memory) microcontroller AT89C51 is used to produce three-phase sinusoidal signal because the price of AT89C51 is cheaper than UV-EPROM. In addition, AT89C51 is easy to use for other application.
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