Switched mode power supply with delay-compensated current...

Details Switched mode power supply with delay-compensated current... Switched mode power supply with delay-compensated current...

2006-01-03

2006-01-03

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C363S021170

Reexamination Certificate

active

06982548

ABSTRACT:
The invention relates to a switched mode power supply with current mode control, in which an inductive element (7) is connected to a power source (5) by means of a controllable switch (9). During closure of the switch (9) the increasing current through the inductive element (7) is sensed by a current sensor (17) and compared with a reference signal (18). When the signal from the current sensor is equal to the reference signal, the switch (9) is opened. Due to circuitry delays the off-switching of the switch (9) occurs at a higher current level than sensed by the current sensor (17). To compensate for this effect the switched mode power supply has means (16, 19, 15) for generating a compensation signal (Ic*R15) proportional to the gradient (di/dt) of the current i through the inductive element (7). The circuitry delay can be compensated for by a suitable choice of values of components (15, 19, 16).

REFERENCES:
patent: 4415960 (1983-11-01), Clark, Jr.
patent: 4939632 (1990-07-01), Plagge et al.
patent: 5757629 (1998-05-01), Yntema et al.
patent: 6016260 (2000-01-01), Heeringa
patent: 6430813 (2002-08-01), Muraguchi et al.

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