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This paper presents an implementation of a three-phase voltage
source inverter with space vector pulse-width modulation (SVPWM)
by using a MCS89C52 single-chip microcomputer.Since only one
single-chip 8-bit microcomputer is used, the proposed inverter
is compact and cost-effective. The implemented program combines
three timers in the microcomputer with the interrupt scheme for
realizing three basic vectors of SVPWM during one switching
interval,such that the main program can compute the required
data for realizing the next space vector in real time. Tables
and table look-up technique are created and employed to avoid
the evaluation of the sinusoidal function and reduce the
computational burden of the microcomputer. Since the switching
interval is fixed in our inverter for realizing one space vector
of the desired output voltage, the phase angle of the output
voltage continues even the desired frequency changes abruptly.
Among all SVPWM techniques,Simulation and experimental results
for driving a 1 HP induction machine are given to demonstrate
the usefulness of the implementation.
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