Title:
A CONTROL CIRCUIT FOR AN INDUCTIVE DEVICE
Document Type and Number:
WIPO Patent Application WO2003005544
Kind Code:
A3
Abstract:
A control circuit for an inductive device (1) providing a first function when driven by a main DC power supply (2) generating a first voltage. The circuit comprises an auxiliary power supply (6) for supplying a second voltage to a part (3) of the circuit, the second voltage having a magnitude greater than the first voltage. A switch (4) is connected in series with the inductive device (1) for periodically switching the power supply to the device (1) on and off to thereby induce transient voltages higher than the first voltage. The auxiliary power supply (3) and the inductive device (1) are coupled such that the auxiliary power supply (3) is energised by said transient voltages, the inductive device (1) thereby providing a second function of boosting the main power supply.
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Inventors:
BRADBURY DAVID JOHN (GB)
Application Number:
PCT/GB2002/003008
Publication Date:
April 03, 2003
Filing Date:
June 28, 2002
Export Citation:
Assignee:
ZETEX PLC (GB)
BRADBURY DAVID JOHN (GB)
BRADBURY DAVID JOHN (GB)
International Classes:
H02M3/155; (IPC1-7): H02M3/155
Domestic Patent References:
| WO2002015374A1 | 2002-02-21 |
Foreign References:
| FR2743220A1 | 1997-07-04 | |||
| US5377094A | 1994-12-27 | |||
| FR2538942A1 | 1984-07-06 |
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