Mike Hertz of Teledyne LeCroy

The presentation covers the measurements of interest for designers of switchmode power conversion circuits and devices. With the goal of high efficiency and reliable designs, we review the acquisition of voltage and current, their relationship in switchmode power conversion circuits, and the analysis of power device switching losses, conduction losses, safe operating area, and dynamic on-resistance. The challenge is to perform accurate analysis while the power transistor or diode is operating in the non-ground referenced primary circuit of an off-line switchmode power supply. Instrumentation requirements such as overdrive recovery, high frequency common mode rejection, and channel to channel time delay matching will be covered. A unique technique will be covered for using information contained in the pulse width modulation signal to find a power circuit's step response and soft start performance. Testing line current harmonics against industry standard EN61000 3-2 and measurements of real power, apparent power, and power factor are included.

Biography:

Mike Hertz has been a Field Applications Engineer with Teledyne LeCroy in Michigan for 18 years.  Before joining Teledyne LeCroy, he worked in Applications and Marketing with both Agilent Technologies and Hewlett-Packard in Colorado.  He holds a BSEE from Iowa State University and an MSEE from the University of Arizona. Hertz is an Eta Kappa Nu electrical engineering honorary recipient, has published over 50 articles in the field of test and measurement, and has been awarded 6 U.S. patents in oscilloscope measurement design.