Method and apparatus for controlling an inverter

Details Method and apparatus for controlling an inverter Method and apparatus for controlling an inverter

1994-09-15

1996-03-26

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 95, H02M 324, H02M 542

Patent

active

055026338

ABSTRACT:
An inverter control apparatus comprises a controller, a mode decision circuit and a voltage reference conversion circuit. The mode decision circuit determines one of three kinds of modes which may be used to control the inverter, namely, a normal mode, a rectangle mode and zero correction mode selected according to values and polarities of multi-phase voltage reference signals. The voltage reference conversion circuit corrects the voltage reference signals according to the determined mode in the mode decision circuit. In the case of the normal mode, the mode decision circuit outputs the previous voltage reference signal V* without change as the new or corrected voltage reference signals. In the case of the rectangle mode, the circuit fixes the voltage reference signal V* having the greatest value of the three phase (U-phase, V-phase and W-phase) to a minimum voltage reference V.sub.min which is of opposite polarity to the selected greatest value signal, or, in another embodiment, to a zero value. Further the circuit converts the others voltage reference signals to corrected voltage reference signals without change of line voltage. The control circuit permits control of the inverter even in a regime of low reference voltage which would otherwise result in an uncontrolled region of the inverter.

REFERENCES:
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patent: 5120986 (1992-06-01), Shekhawat
patent: 5130917 (1992-07-01), Shekhawat
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patent: 5347443 (1994-09-01), Muramatsu et al.
patent: 5349522 (1994-09-01), Konishi et al.
patent: 5367448 (1994-11-01), Carroll
patent: 5381328 (1995-01-01), Umezawa et al.
patent: 5410464 (1995-04-01), Yoshino
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