Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1989-09-01
1990-12-04
Stephan, Steven L.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
323282, 323285, 363 79, 363 97, H02M 3335
Patent
active
049758209
ABSTRACT:
A circuit (20, 40, 50, 60) for generating an optimal compensating ramp voltage signal V.sub.cramp, with the minimum necessary slope, m.sub.c for a current mode DC/DC converter is shown. The adaptive compensating ramp generating circuit (20) is comprised of two voltage dividers (22, 24), the first voltage divider 22 divides an input voltage V.sub.IN and the second voltage divider 24 divides an output voltage V.sub.OUT. The first voltage divider (22) has two resistors (26, 28) in series: the first resistor (26) has a resistance of (1/B-1) * R ohms and the second resistor (28) has a resistance of R ohms. V.sub.OUT is divided by the second voltage divider (24) having two resistors (29, 30) in series: the first resistor (29) has a resistance of (1/A-1) * R ohms and the second resistor (30) has a resistance of R ohms. The constants A, B, and C are selected for the particular type of DC/DC converter employed. The divided voltages A * V.sub.OUT and B * V.sub.IN are input into a voltage controlled current source (32). The voltage controlled current source (32) has a scaling resistor R.sub.scale, an amplifier (36), a transistor Q, and a diode D1. The output of the current source (38) is coupled to a capacitor C.sub.ramp whose voltage realizes the slope of the compensating ramp signal, V.sub.cramp. The capacitor C.sub.ramp is charged through R.sub.scale.
REFERENCES:
patent: 4672518 (1987-06-01), Murdock
patent: 4674020 (1987-06-01), Hill
patent: 4717994 (1988-01-01), Diaz et al.
patent: 4837495 (1989-06-01), Zansky
National Semiconductor Corporation
Stephan Steven L.
Sterrett J.
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