Back to results
US 6,285,234 B1Granted
Current-mode magnetic isolator for switching DC-DC converters
AssigneeSystem Design Concepts, Inc.
InventorKeng Chih Wu
Life of this patent
Estimating the term…
Abstract
A signal isolator using magnetic coupling is disclosed. In contrast to the prior art non-isolated voltage summing circuits, the present invention utilizes current summing and magnetic coupling. In addition to providing ground and signal isolation the circuit of the present invention also provides a current-summing node which is always in a high impedance state, thereby allowing ancillary control mechanisms to be easily implemented in the circuit.
Claims8
A magnetic signal isolator comprising:
- an input node;
- an output node;
- and
- a current-summing isolation means, coupled between said input node and said output node, for providing electrical isolation between a signal input to said input node and a signal output from said output node, said current-summing isolation means comprising:
- amplifying means for comparing a scaled voltage applied to said input node and a reference voltage and outputting an error voltage representing the difference between said input voltage and said reference voltage;
- converting means for converting said error voltage to an error current;
- power transforming means, having a primary and a secondary, for providing power to said current summing circuit;
- current transforming means, having a primary for sampling current on the primary of said power transformer, and first and second secondaries, said second secondary receiving said current sampled from said power transformer via said primary of said current transformer;
- and
- a current-summing node receiving and summing said error current and said current sampled from said power transformer.
7 more elements
Dependencies are inferred from the claim text.