Apparatus and method for controlling switching elements in a PWN

Details Apparatus and method for controlling switching elements in a PWN Apparatus and method for controlling switching elements in a PWN

1989-01-19

1990-05-08

Salce, Patrick R.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 41, 363 98, H02M 744

Patent

active

049243730

ABSTRACT:
Disclosed is an apparatus and method for controlling switching elements (51-56) of a PWM-controlled value type inverter by a software program using a microcomputer (10). The control apparatus of the present invention produces a switching element control signal (an on/off signal) according to the following steps. When a control command value commanding the output of the inverter is determined, a control mode corresponding to the commanded output value is selected from among a plurality of control modes (M1-M6) previously contained in a table to determine the switching elements to which the control signal is applied and the order of controlling the switching elements. Further, on the basis of the control command value, the difference between a modulation signal and a predetermined reference value is computed for each phase to determine the timing of controlling the switching elements. The unit control period of each control mode is divided into halves, and the switching element control timing is determined in each of the halves of the unit control period. The control signal is produced on the basis of the combination of the selected control mode and the determined control timing.

REFERENCES:
patent: 4099109 (1978-07-01), Abbondanti
patent: 4290108 (1981-09-01), Woehrle et al.
patent: 4513362 (1985-04-01), Aizawa
patent: 4772996 (1988-09-01), Hanei et al.
patent: 4870556 (1989-09-01), Inaba
Kamiyama; "New Drive Electronics", Jul. 1986, p. 92.

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