TimatPSUTest.com

Power Supply Engineer specializing in product reliability. From design review to bench work to induce intermittent failures. By reducing the failure rates by 50% or more with no or very low additional cost.
Here is one example: The initial production run of a computer supply had a high failure rate. By doing extensive testing I determined the power supply was failing while being powered down. Design changes were made to the FET gate drive circuit and the return rate decreased by 95%. Also, the output filter and voltage feedback were changed to decrease “coil whine”.

Finding what causes failures is like detective work or solving a puzzle. Early on in my career I found that by adding a 5-cent capacitor the failure rate on an uninterruptible power system product was reduced by 90%. It took a week of testing to find the cause and solution.

AMETEK Solidstate Controls Field Service Engineer Apr 2017 - May 2021

• Performed routine maintenance, troubleshooting and repairs on power electronic equipment to include: Uninterruptible Power Supplies (UPS); Analog and processor controlled, Power Inverters, Phase controlled rectifiers, Power conditioners, Static switches, Industrial batteries.

FirePower Technology, Inc. Carlsbad CA Senior Engineer Jan 2014 - Jan 2015

• Designed Bluetooth controlled programmable power supply with an output range of 9.30 to 14.00 volts. Output could be changed with SCPI type commands including read back of current, voltage and power. Wrote repair procedures for several power supply models.

OCZ Technology Group, Power Management Divsion Carlsbad CA Senior Engineer Apr 2010 - Jan 2014

• Worked with customers and vendors to improve performance and reliability of power supplies. Managed EVT, DVT, PVT of all power supply models. Supervised RMA department. Approved all engineering changes on power supplies. Provided engineering support for OEM customers. Recommended changes to reduce coil whine. Reduced field failure rate by 80%.

Eaton Electrical Diamond Bar CA Senior Customer Service Engineer Apr 2007 - Apr 2010

• Diagnosed and repaired Uninterruptible Power Systems at customer site up to 750 kVA. Trained coworkers for proper methods and how to use personal protection equipment to work safely around high power electronics.

Senior EngineerSenior Engineer PC Power & Cooling, Inc. Carlsbad CA Senior Engineer Mar1989- Apr 2010

• Designed custom computer-controlled power supply testers in 1989 that were still being used in 2015. It consists of electronic loads, data acquisition, and stored all results in a computer. They were used to test approximately one million power supplies. Designed parallel redundant power module to parallel two Turbo-Cool 450 power supplies. Modified standard Turbo-Cool 600 power supply to meet requirements for Siemens Medical CT system. Worked as sales engineer and made custom displays for trade shows. Worked part time as consultant 2004 to 2010.

Independent Consultant Vista CA Aug 2004 - Apr 2007

• Designed module to digitally control power supply voltages and motherboard memory voltages for CMTL Labs in Anaheim, CA. It used a Microchip PIC16F774 microcontroller and saved voltage readings in a EEProm. Also failure analysis of and repair of DC power supplies for other customers including PC Power & Cooling, Inc

Proxima Corporation San Diego CA Project Engineer Mar 1988 to Mar 1989

• Designed hardware and wrote software for production test system for uninterruptible power systems. Supervised UL testing and Awarded a US patent for uninterruptible power system

STATIC POWER CONVERSION SERVICES INC. San Diego CA Field Jan 1987 - Mar 1988

• Performed routine maintenance, troubleshooting and repairs on power electronic equipment to include: Uninterruptible Power Supplies (UPS); Analog and processor controlled, Power Inverters, Phase controlled rectifiers, Power conditioners, Static switches, Industrial batteries

Elgar Corporation San Diego CA Project Engineer July 1985 - Jan 1987

• In charge of single and three phase uninterruptible power systems from 5 kVA to 50kVA including parts selection, magnetics design, and safety agency testing for standard and custom systems.

Deltec Corporation San Diego CA Senior Field Service Engineer Jul 1983 - Jul 1985

• Performed routine maintenance, troubleshooting and repairs on power electronic equipment to including Uninterruptible Power Supplies (UPS); Analog and processor controlled, Power Inverters, Phase controlled rectifiers, Power conditioners, Static switches, Industrial batteries. Designed test fixture to calibrate any series 6000 logic boards any 6000 series UPS.

Power Condition Systems DBA Sterling Associates San Diego CA Field Service Engineer/Project Engineer Oct 1982 - Jul 1983

• Performed routine maintenance, troubleshooting and repairs on power electronic equipment including Uninterruptible Power Supplies (UPS); Analog and processor controlled, Power Inverters, Phase controlled rectifiers, Power conditioners, Static switches, Industrial batteries. Redesigned 60 hz UPS into 400 hz frequency converter.

Heliotrope General Spring Valley CA Project Engineer Oct 1981 - Sep 1982

• Design of differential thermostats for the solar industry. Designed test fixture for failure analysis of failed quad operational amplifiers. Modified design to prevent failures due to induced voltage caused by lighting.Design of differential thermostats for the solar industry. Designed test fixture for failure analysis of failed quad operational amplifiers. Modified design to prevent failures due to induced voltage caused by lighting.

Elgar Corporation San Diego CA Field Service Engineer 1980 - Oct 1981

• Performed routine maintenance, troubleshooting and repairs on power electronic equipment including Uninterruptible Power Supplies (UPS); Analog and processor controlled, Power Inverters, Phase controlled rectifiers, Power conditioners, Static switches, Industrial batteries.

Topaz Electronics San Diego CA Engineering Technician Jan 1979 - Sep 1980

• Worked with engineers on development of new products and reliability improvement. Received cash bonus for “Exceptional contribution to the resolution of an operational problem of the U6 UPS”

Micro Power International, Inc. San Diego CA Jan 1976 - Jan 1978

• Designed DC power supplies.

Modular Power, Inc. San Diego CA Senior Test Technician Aug 1974 - Jan 1976

• Started as test technician and was promoted to test department supervisor.