Method and apparatus of isolating and level setting

摘要

An electrical isolation circuit that sets a voltage level for programming a product is contained in a stand-alone module. The electrical circuit includes a first input terminal connected to a first optocoupler, which provides a first level of isolation, a transformer, which provides a second level of isolation, and a second optocoupler, which provides a third level of isolation. The circuit outputs a signal to a level setting circuit prior to outputting the signal. An advantage of the module is it interfaces with a plurality of programming boxes, so new modules do not have to be created.