Protected zero-crossing detection using switching transistor's o

Details Protected zero-crossing detection using switching transistor's o Protected zero-crossing detection using switching transistor's o

1996-12-31

1998-11-24

Riley, Shawn

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 53, 363 80, 363 89, H02M 3335

Patent

active

058416412

ABSTRACT:
An auxiliary power transistor which is switched in common with the primary power transistor, and which isolates the voltage-monitoring circuit when the primary power transistor is off. Thus the signal for sensing the secondary current is connected only when the power transistor is turned on, and high voltages in the sensing logic are avoided. This is particularly advantageous for systems where the turn-off times of the power transistor are sought to be synchronized with current zero-crossings. This current-zero-crossing technique may be used to detect zero-crossings of current on a secondary-side switch.

REFERENCES:
patent: 4428015 (1984-01-01), Nesler
patent: 4428016 (1984-01-01), Brasfield
patent: 4460951 (1984-07-01), Fenter et al.
patent: 5237262 (1993-08-01), Ashley et al.

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