Mark Ziegenfuss is a power electronics design engineer with over 30 years of experience in electrical engineering, power electronics design, switching power supply design, systems and controls, analog design, and power management. He has worked as a contract design engineer for several companies developing DC-DC converters, motor controls, isolated power electronics, and power supplies using techniques like soft switching, PFM control, and synchronous rectification. He also has experience in magnetic design, modeling, simulations, programming, and patenting a LED driver topology.

1. Mark Ziegenfuss
Power Electronics Design Engineer
3730 Farm Hill Blvd. Redwood City, CA. 94061, USA
408-500-2288 (cell) mark.ziegenfuss@gmail.com
Summary: Electrical engineering: Power electronics Design, switching power
supply design, systems and controls, analog design, Power management
DC/DC, AC/DC, PFC, Soft Switching techniques, Magnetic Design, PSPICE/
(ORCAD), SiMetrix/Simplis Modeling/simulations, MATLAB/SIMULINK, C/C++,
Motor control design
Engineering work experience:
Enteq- XXT - Santa Clara, CA (Contract Design Engineer) 7/14 to 2/15, power &
analog electronics design. PWM, constant on time control, Buck, boost. Power
supply modeling and simulations with PSPICE and SiMetrix/Simplis. Down hole
monitoring and transceiver design.
Curtiss Wright controls and avionics - LA (Contract Design Engineer) 12/13-
7/14. Power electronics-three phase PMSM Motor controls (design, WCA, Stress
analysis, thermal analysis, stability/control modeling EMI testing).
Williams International – MI (Contract Design Engineer) 4/13 to 11/13, Power
Electronics design, isolated power electronics, flyback design and motor control
systems, power magnetic design.
Loral Space Systems - Palo Alto, CA (Design Engineer) 4/11-11/12, Part of
design team to develop DC-DC converters for satellite applications, flybacks,
forwards converters for satellite plasma propulsion unit. Stress analysis,
simulation and Lab work including troubleshooting using all the standard lab test
equipment.
Micrel Semiconductor - San Jose, CA (Applications Engineer) -PMIC’s 8/06-
4/11
New PMIC (power management IC) evaluation, Custom design DC-DC voltage
regulators, current regulators, High Brightness LED drivers, Topologies:
Synchronous buck, boost, SEPIC, current mode, voltage mode, constant on/off
mode. Application designs for customers, Writing: data sheets, articles,
application notes
Raytheon Missile Systems - Tucson, AZ (Contract Design Engineer) 4/05-
5/06, Part of design team to develop DC-DC converters Topologies used include;
current mode forward DC-DC converter, multi-phased synchronous DC-DC

2. converter, flyback voltage mode DC-DC converter. PSPICE and SiMetrix/Simplis
modeling and simulations (Engineering lab hands on troubleshooting and design
evaluation)
Apical Instruments - Mountain View, CA (Contract Design Engineer) 6/98-
8/1999
IR&D on AC-DC and DC-DC converter, LLC Half Bridge (ZVS). Off line
(universal) low leakage isolated (500KHZ) power inverter (DC-AC) for non-
invasive surgery. Including housekeeping supplies and control circuitry.
Completed a working prototype SMPS and power generator. Topologies used
include: full and half bridge (ZVS), synchronous buck, flyback.
Litton Electron Devices - San Carlos, CA. (Design/Project engineer) 12/96-
4/98
Part of a team that design and develop power conditioners for microwave
amplifiers (TWTA), The power conditioner includes; TWT electrode modulators,
and modulators bias supplies, house keeping supplies, post regulators, EMI input
filters, logic control design, stability/control design. Thermal design, Interface
control: status/fault/soft start/hard start. Topologies used include: AC-DC, DC-
DC full and half bridge, push pull, forward, buck
Varian Associates - Santa Clara, CA. Project Engineer 1/88-6/90
Project engineer on SMPS (TWTA). 250W (ZVS) full and half bridge push pull.
Teledyne CME - Santa Clara, CA. Engineer 8/84-2/87
SMPS to power traveling wave tube amplifiers (TWTA) same as Varian and
Litton
Additional Skills: DSP/MATLAB programming, C/C++ programming SPICE
Behavioral and device modeling
US Patents: A High Brightness LED driver using a boost typology without using
an output capacitor
Self employed experience: 1/2000-6/2004 and 1/91-6/96 (Self employed
musician)
Education: B.S.E.E. University of Missouri in Rolla, 1984. And graduate
classes towards MSEE
Security Clearance: Secret clearance not currently active