Patent ID: 8817496
Filing Date: 2014-08-26
Classification: G01R,H02M

Abstract:
1. A sensing arrangement for a circuit comprising a magnetic component arranged such that the component is driven during a supply period and provides an output during a flyback period when the component is not supplied, the arrangement comprising: a sense winding coupled to the magnetic component; an interface network coupled to the sense winding and arranged to provide a circuit node at which a voltage may be measured as indicative of the voltage across the sense winding; and a fixed value pull-up resistor arranged to apply bias to the voltage measured, wherein the fixed value is chosen so that the circuit node is always positive over a range of input voltage; the pull-up is to a first level during the supply period and to a second level during the flyback period; the first and second levels being selected such that the voltage across the sense winding is scaled differently during the supply period and the flyback period.