Drive device for a push-pull stage

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

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363 98, H02M 3335

Patent

active

055152589

ABSTRACT:
A drive device for a push-pull stage includes a microcontroller in the form of a pulse-width modulator which, starting with a selected switching frequency, varies the pulse-duty ratio (modulation) of the pulse-width modulated output signal and which, with chronological delay, controls the push-pull stage. The push-pull stage has at least one upper and one lower power switch, and the microcontroller has three pulse-width modulation outputs. The actual pulse-width modulated output signal is delivered at the first output, the modulated signal plus a dead time is delivered at the second output and is supplied to the lower power switch as a drive signal, and the dead time by itself is delivered at the third output. The drive signal for the upper power switch is formed by the difference between the modulated signal and the inverted dead time is automatically decreased in the limit region of the modulation, i.e., when the modulation approaches 100% or 0%, and one power switch is continuously switched on, whereas the other power switch is switched off during the same time. Beginning with a specific limit value of the modulation, a power bit is regularly delivered at a fourth output, which effects a 100% modulation.

REFERENCES:
patent: 4800477 (1989-01-01), Esposito
patent: 4843532 (1989-06-01), Freedman
patent: 5012058 (1991-04-01), Smith
patent: 5055762 (1991-10-01), Disser et al.
"Drehstrommotor-Steuerung mit dem M 37704," Meckel, Electronik Industrie 7 (1992) pp. 38-39.
"Anwendungs-spezifischer 6-Bit-Motor-Controller," Seeger, Electronik 1 (1991) pp. 48-51.

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