Circuit for providing isolation between components of a power co

Details Circuit for providing isolation between components of a power co Circuit for providing isolation between components of a power co

1993-04-26

1995-06-13

Williams, Hezron E.

Communications: electrical

Systems

Selsyn type

340538, H04M 1104

Patent

active

054247098

ABSTRACT:
An industrial automation system using transformers for providing electrical isolation between a system interface chip and a load interface chip while simultaneously allowing communication of power and data across the isolation barrier. Clock pulses are transmitted from the system interface chip to the load interface chip across one transformer, and the clock pulses are used by the load interface chip to create a power supply for operating the components within the chip. Data is communicated from the system interface chip to the load interface chip across a second transformer by the use of messages. Each message comprises a bit sync field, a byte sync field, and a data field. The bit sync field and byte sync field are used by the load interface chip to synchronize itself with the system interface chip. Transmission and reception of data by the chips are interleaved on a bit-by-bit basis, wherein a bit is transmitted from the load interface chip to the system interface chip after each bit is transmitted from the system interface chip to the load interface chip. After each byte of data is transmitted and received by the chips, the load interface chip eliminates synchronization between the chips, and must resynchronize itself with the system interface chip in order to transmit and receive the next byte of data.

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