Patent ID: 7974109
Filing Date: 2011-07-05
Classification: H02M

Abstract:
1. A switch-mode power supply control system for regulating an output voltage at the output of a delivery cable of a power supply over multiple switching cycles said power supply having a primary side and a secondary side that includes said delivery cable, the system comprising: a transformer having a primary magnetizing inductance that electrically separates said primary and secondary sides; a sense voltage unit having a winding on the primary side, to generate a sense voltage on the primary side that is proportional to an output voltage signal on the secondary side; a cable offset voltage unit positioned on the primary side, for determining an offset voltage signal representing a drop in voltage caused by load current passing through the delivery cable positioned on the secondary side; and a feedback unit, for generating a digital feedback voltage signal on the primary side that is used to maintain a substantially constant voltage at the output of the delivery cable over multiple switching cycles, said digital feedback voltage signal determined based upon at least said sense voltage signal, said offset voltage signal and a reference voltage signal representing a target voltage for the voltage regulation wherein