Title:
SWITCHED MODE POWER SUPPLY WITH DELAY-COMPENSATED CURRENT MODE CONTROL
Document Type and Number:
WIPO Patent Application WO2003049265
Kind Code:
A3
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).
Inventors:
DE BOER JAN R (NL)
Application Number:
PCT/IB2002/004968
Publication Date:
November 06, 2003
Filing Date:
November 20, 2002
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
DE BOER JAN R (NL)
DE BOER JAN R (NL)
International Classes:
H02M3/28; H02M3/156; H02M3/335; (IPC1-7): H02M3/156; H02M3/335
Foreign References:
| DE10040413A1 | 2002-03-07 | |||
| US5757629A | 1998-05-26 | |||
| EP0383382A1 | 1990-08-22 |
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