Pulse width modulation control unit of inverter

Details Pulse width modulation control unit of inverter Pulse width modulation control unit of inverter

1989-04-18

1991-01-29

Stephan, Steven L.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363132, H02M 112

Patent

active

049891286

ABSTRACT:
In a pulse-width modulation control unit for an inverter, in the case where the carrier frequency is a normal value of about 5 KHz, the control unit calculates the ON time (the PWM control pattern) at every calculation period corresponding to such a carrier frequency and divides the calculation ON time into plural pulses. This enables the control unit to present apparently such conditions that the PWM control was carried out at a higher carrier frequency (20 KHz or higher), while using a one-chip microcomputer which requires a comparatively long calculation time. Thus, the PWM control by a higher carrier frequency can be attained at a lower cost and by a simple circuit construction.

REFERENCES:
patent: 4322786 (1982-03-01), Weber
patent: 4622628 (1986-11-01), Murasaki et al.
patent: 4691269 (1987-09-01), Yamane et al.
patent: 4713220 (1987-12-01), Huynn et al.
patent: 4829416 (1989-05-01), Inaba et al.
patent: 4870556 (1989-09-01), Inaba et al.
"Power Electronics and AC Drives"; Bose; Prentice-Hall; 1986; 374-375.

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