Constant current output control method and constant current...

Details Constant current output control method and constant current... Constant current output control method and constant current...

2005-03-15

2005-03-15

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S097000, C363S131000

Reexamination Certificate

active

06867986

ABSTRACT:
A constant current output control method and device for a switching power supply circuit for constant current output control of an output current I2oof a rectifying smoothing. An OFF adjustment time T3is:in-line-formulae description="In-line Formulae" end="lead"?T3=T2×(Np÷Ns×Ipref÷2÷I2oset−1)−T1  (1)in-line-formulae description="In-line Formulae" end="tail"?in which, I2osetrepresents a set output current of the rectifying smoothing circuit, Np represents a number of turns of a primary winding, Ns represents a number of turns of a secondary winding, T1being a fixed time representing an ON time, Iprefrepresenting a reference peak current flowing in the primary winding, and T2representing an output time during which output is generated from the rectifying smoothing circuit. Output current I2oduring an oscillation period T becomes set output current I2oset, and constant current output control can be executed by repeating this method.

REFERENCES:
patent: 4071884 (1978-01-01), Maigret
patent: 4646218 (1987-02-01), Scholer
patent: 6201713 (2001-03-01), Hosotani
patent: 6445598 (2002-09-01), Yamada
patent: 6456511 (2002-09-01), Wong
patent: 2002-136116 (2002-05-01), None

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