HW/SW Engineer

Mark Ziegenfuss

**** **** **** ****. ******* City, A. 94061

650-***-**** (hm) 408-***-**** (cell) ****.**********@*****.***

Objective: Electrical engineering: Summary: Power management, switching

power supply design, systems and controls, analog/power electronics, C/C++,

Engineering work experience:

Loral Space Systems Palo Alto, CA Design engineer 4/11 to 11/12. Part of

design team to develop DC-DC converters for satellite applications,

flybacks, forwards, Weinberg converters, Lab testing and trouble shooting

using all the standard lab test equipment. Writing Test procedures/ tests

results

Micrel Semiconductor San Jose, CA Applications Engineer- PMIC's 8/06- 4/11

New PMIC evaluation (engineering lab hands on tests and trouble shooting

and design evaluation and verification), Custom design DC-DC voltage

regulators, current regulators, High Brightness LED drivers Typologies:

buck, boost, SEPIC, current mode and voltage mode constant on mode.

Application designs for PMIC's, Writing: data sheets, articles, application

notes

Raytheon Missile Systems Tucson, AZ (contractor) Design engineer 4/2005 -

5/2006, 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. (Engineering lab hands

on tests and troubleshooting and design evaluation and verification)

Apical Instruments Mountain View, CA (contractor) Design engineer 6/98-

8/1999

IR&D for AC-DC and DC-DC converter, soft switching (zero current switching)

regulated out put voltage up to 230Vdc. Off line (universal) low leakage

isolated medical grade RF (500KHZ) power inverter (DC-AC) for non-invasive

surgery. Including house keeping supplies and control circuitry.

Completed a working prototype SMPS and RF power generator. Topologies used

include: full and half bridge, 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, (linear and magnetic amps), EMI input filters, magnetics, logic

control, stability loops. Thermal design. Interface controls including

status, complete fault control, soft start, hard start etc. Topologies

used include: AC-DC, DC-DC full and half bridge, push pull

Additional Skills: C/C++, Labview, MATLAB programming, Behavioral modeling

of DC-DC converters

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

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