A Stable CS01 Tester for Switch Mode Power Supplies

摘要

The traditional EMC CS01 test method uses an injection transformer to couple voltage from a generator onto the dc power lines of the device under test. It is not recent, but neither is it generally known that "chopper" dc to dc power converters can have a potentially damaging adverse reaction because of the use of the injection transformer. This paper discusses the reason, some early attempts to eliminate the oscillation (that may not perform as well as hoped), and describes one alternative CS01 test method to certainly avoid the problem. It is unconscionable that MIL-STD-461 does not provide warning and a work-around for this situation.