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Mark Ziegenfuss
mark.ziegenfuss@gmail.com
3730 Farm Hill Blvd. Redwood City, CA. 94061 (408) 500-2288
Power Electronics Design Engineer
Summary Profile:
Experienced electrical engineer and engineering manager with emphasis in
Power Electronics Development and Design. Skills include: analog design,
power management: design, R&D, board bring up, controls and stability,
compensation network design. Software skills include: C/C++, Pspice,
MATLAB/Simulink. DFM, DFT. Experience/Knowledge with power Inverters
Buck, boost, flyback, forward, bridges, SEPIC, current and voltages modes
PWM, hysteretic mode,soft switching techniques ZVS, ZCS, resonate LLC
Unique Features:
Hold US patent in high brightness LED driver; Writing/publishing: data sheets,
articles, application notes; MSEE graduate classes, Security Clearance
Engineering work experience:
Lunera Lighting -Santa Clara, CA
January 2016 to present
Power Electronics Design Engineer – Power/analog electronics design manager.
AC/DC Power systems design for LED drivers. PFC (BCM) design, buck
constant on ZVS design.
ACSS-(an L-3com company) - Phoenix, AZ
July 2015 to December 2015
Contract Design Engineer – Power/analog electronics design. Aircraft/Avionics
Power systems design (DO160). PFC design, SEPIC, synchronous buck
constant on design , forward PWM circuit design.
Enteq- XXT - Santa Clara, CA
July 2014 to February 2015
Contract Design Engineer - analog electronics design using opamps, bipolar,fets,
filters. Diffamps and low signal analog signal processing. PWM, constant on time
control, buck, boost, forward converter design, temp monitoring, analog filter
design, down hole monitoring and electromagnetic transceiver design.
Curtiss Wright Controls and Avionics – Los Angeles, CA
December 2013 to July 2014
Contract Design Engineer - power electronics design: 3ph power inverter for
PMSM motor. WCA, stress analysis including: thermal analysis, stability/control,
EMI emissions, max field strength in power magnetic. Conducted and

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Completed Lab tests for EMI compliance, power regeneration, efficiency, temp
rise and shoot through currents. Redesigned the inverter and gate drive circuits
to achieve maximum performance. Developed SiMetrix/Simplis and PSICE
models to aid in the WCA and stress calculations.
Williams International –Walled Lake, MI
April 2013 to November 2013
Contract Design Engineer - power electronics design, isolated power electronics,
flyback design, DC/AC power inverter, motor control systems, power magnetic
design. R&D work on ignition system for gas turbine engines.
Loral Space Systems - Palo Alto, CA
July 2011 to Sept 2012
Design Engineer - part of design team to develop DC-DC converters for satellite
applications, flyback, forward converters for satellite. Conducted trouble shooting
tests and problem solving on plasma propulsion units.
Micrel Semiconductor - San Jose, CA
August 2006 to June 2011
Applications Engineer -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
application notes, data sheets and trade magazine articles.
Raytheon Missile Systems - Tucson, AZ
April 2005 to May 2006
Contract Design Engineer - part of design team to develop DC-DC converters;
topologies used include: current mode forward DC-DC converter, multi-phased
synchronous DC-DC converter, flyback voltage mode DC-DC converter,
PSPICE and SiMetrix/Simplis modeling and simulations
Apical Instruments - Mountain View, CA
June 1998 to August 1999
Contract Design Engineer - IR&D on AC-DC and DC-DC converter 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.
Litton Electron Devices - San Carlos, CA
December 1996 to April 1998
Design/Project engineer - part of design team to develop power supplies for
microwave traveling wave tube amplifiers (TWTA).
Varian Associates - Santa Clara, CA
January 1988 to June 1990

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Project engineer - SMPS (TWTA), 250W (ZVS) full and half bridge and push pull.
Teledyne CME - Santa Clara, CA
August 1984 to February 1987
Entry level design engineer - SMPS (TWTA)
Education:
B.S.E.E. University of Missouri in Rolla, 1984
Graduate classes towards MSEE
Other work experience:
Self-employed Musician
January 2000 to June 2004 and January 1991 to June 1996