H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/103, 318/115
H02P 7/29 (2006.01) H02P 6/02 (1990.01) H02P 7/628 (1990.01)
Patent
CA 1289616
ABSTRACT OF THE DISCLOSURE A pulse width modulated method, of controlling the supply of electrical power to an inductive load, using at least one power switch having "on" and "off" states for providing, respectively, low and high impedance paths between the inductive load and a source of power, thereby controlling the current flow through the inductive load during a sequence of regular reoccurring time periods, and wherein the at least one power switch is switched, if in the "off" state, to the "on" state substantially at the beginning of at least some of the time periods, the method comprising the combination of steps, operative during any one of a plurality of the time periods, of switching the at least one power switch from the "on" state to the "off" state when a predetermined level of current flow has been reached flowing in one of, the inductive load and the at least one power switch, and switching the at least one power switch back to the "on" state after the "off" state, independent of the occurrence of the beginning of a time period.
476071
Fisher & Paykel Limited
Riches Mckenzie & Herbert Llp
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