RESUME OF HAROLD MASSIE

Harold Massie

**** ******* **, *** *

Lima, Oh 45805

(Home/Cell) 602-***-****

ad3kth@r.postjobfree.com

OBJECTIVE:

To make significant contributions in an engineering position in: Power delivery technology, instrumentation development, sensor development, LED lighting, EMI testing, Battery technology testing and control circuit development, Aerospace/military design, Medical equipment development. To include design, circuit modeling, evaluation, application testing, qualification, and customer support. AC and DC motor control electronics design and qualification. Battery performance in system design.

SUMMARY:

Selected accomplishments include:

- Design and qualification testing on Battery Charger with FET switch output from Battery or AC source.

- Design and qualification testing on 650Vdc compressor motor driver now in production.

-Design analysis on 460Vac compressor moto driver. Now in early proto phase. Includes EMI Spice modeling.

Designed Poga pin testers for testing assembled PCB’s, including DVM and serial Port monitoring. Wrote Test Procedures.

-Design of Ultrasonic circuits for Military sensor applications, including isolated and non-isolated DC-DC and LDO power converters in compliance with Mil Specs (MIL-STD 704,461, 464)

-Design on 3000W isolated power supplies using commercial modules with custom current share design. Including Ideal Diode, PFC Input blade, and Output blades. In compliance with (MIL-STD 704,461, 464).

-Performed Traceability analysis.

-Designed Off-Line power supplies (15W and 50W) for LED Lighting.

- Designed LED lighting assemblies with active current share between segments.

-Designed of LED DC-DC converters for local current delivery to LED’s.

-Extensive analog circuit design, advanced development, product design, application evaluation, and use of digital circuits and sensors.

-Off line redundant power delivery definition, design and qualification.

-Designed buck-boost DC-DC converters.

-Designed Lithium battery charging circuits, spec’d battery AH and charging for max life in DC-DC converter applications. Measured AH capability.

-Performed Lithium battery testing and life expectancy.

-Designed, programmed, built ATE testers for advanced development and product evaluation. Visual Basic control. Understand using Labview.

-Product definition, Design, Application testing, and customer support on high frequency (2-20MHz) Dr Mos DC-DC converter modules.

-Twenty patents granted for DC-DC power conversions, power supply, and power delivery, and sensor technology.

- Received awards at On Semiconductor and at Intel, including Intel’s highest- The Individual Achievement Award.

-Power supply qualification, vendor selection, joint vendor engineering project development.

-Tested power supplies with spectrum analyzers, input voltage spike testing, ESD, EMI susceptibility and emissions.

-Analog circuit design, including Spice, Mentor, and MathCAD circuit analysis and modeling.

-Project ownership, scheduling, and leadership. Program manager on 10-20MHz module design, and leadless package module design.

-Intuitive understanding of how circuits, sensors, and electrical mechanical devices work, and how to find the best solution.

-Mentor schematic entry, Pspice, LT Spice simulation.

-PCB layout using PADS Schematic and PADS Layout software.

-Schematic creation using OrCadd.

-PCB layout designs for Application’s testing, ATE testing, and QA burn-in.

-EMI measurement/reduction/certification experience. A co-author of two papers and a seminar presentation on EMI reduction in PCB design. Constructed EMI room for Engineering evaluation.

-Qualified vendor devices for product performance.

-Wrote design, specification documents and test plans.

-ISO9000 training.

-Experience with ultrasonic, magnetic, and optical sensors.

-Performed manufacturing support and failure analysis.

Specific Skills Area:

- High voltage motor control testing and Spice analysis.

-Designed Poga pin testers for testing assembled PCB’s, including DVM and serial Port monitoring. Wrote Test Procedures.

-Testing power supplies with input voltage spikes, EMI susceptibility, EMI emissions, ESD

-ATE hardware design, programming, and application testing with Visual Basic.

-500W Flyback hold-up design.

-DC to DC converter design/applications.

-Spice circuit analysis.

-Off Line LED Fly back Driver design.

-LED active current share.

-Offline power supply design with current share Hot Swap.

-Lithium battery charging applications. Testing for AH capability.

-EMI testing on computer systems. Designed PCB’s to minimize EMI. Set up EMI lab for engineering evaluation, system EMI testing. Responsible for system EMI testing at certification site.

-Designed analog and digital interfaces.

-Mentor LT Spice simulations of circuit designs and Mentor schematic entry. Used MathCadd analysis.

-Applied Excel equations for circuit and system analysis.

-Application PCB design and layout, including needs for EMI and high speed logic and power bypassing. Designed PCB boards for Application testing with interfaces for module ATE testing.

-Analog and digital circuit design. Most experience in analog design.

-Semiconductor and system design and test requirement documents.

- Application and Qualification testing on semiconductor components, modules.

-Designed test boards for QA burn-in.

-Designed Application test boards compatible with component ATE testing.

-Project management activities.

-Proficient with Microsoft products.

-Did design work on GAN and Silicon Carbide gate drivers.

-Proficient with Scope, logic analyzer, Network Analyzer, Electronic loads, meters, Data Acquisition instruments.

- Sensor technology application-temperature, pressure, audio, ultrasonic, light.

-Closed loop stability analysis

-Lithium battery performance, cell charging sharing, and life expectancy.

-Digital logic understanding.

-Designed high power AC to DC power system using commercial building blocks.

BACKGROUND OF EXPERIENCE:

Emerson Ridgid Tool (Contract Position)

November 8, 2023 to Present: Senior Design/Test Engineer for motor powered tools:

Sustaining Engineering: 1) A mature product: Analyzed three failed units out of 300K units and found that the power switch was going into a high resistance state to melt the plastic enclosure. Fix was a larger switch. 2) A mature product with a Bridge transistor circuit driving a transformer had some failures in the field and in test. Did Spice modeling and found that the transistor driver (CMOS) did not provide enough base current in worse case. Changed transistor driver to a small FET. New Product Engineering design. 3) Three phase motor power system analysis: Did Spice and spread-sheet analysis to confirm that the design had margins. This included Lithium Battery analysis/test on charge circuit. Found that if one cell is significantly charged (50%) and the other cells discharged to 0%, the 50% Lithium battery cell will fail during charging because of too high voltage. Need to lower max battery charge voltage or improve the BMS cell voltage sharing. Analyzed and tested battery charger/motor driver (18V/30A) circuit for regulation, noise, efficiency, transient response and stability, including FET drive margins, as well as switching output from battery to AC line voltage source. Used Altium Designer software.

Emerson Environmental (Contract Position)

July 2021 to November 2023: Senior Design/Test Engineer on Air-Conditioning Compressor Driver. For a 650V/15,000W Drive, performed performance testing and test data analysis, developing pass/fail criteria, as well as analyzing failure causes. Using LTSpice, modelled circuits for failures and operational margins. Product now in production.

For a new product, 460V 3-ph, did LTSpice design analysis on DC-DC converters, including a 1000V input flyback to check performance with two lower voltage FET’s in series (Cascode). Found that primary ring peak voltage suppression dissipated excessive power. Designed a low loss voltage clamp, which has been designed in on the proto build. Developed a Spice model to model the conducted EMI in the system and compare the EMI filtering of the 460Vac Drive to the 650Vdc Drive filtering. Performed conducted EMI measurements on the 650 Drive to establish a reference EMI level on both a compressor and a resistive load using a Spectrum analyzer.

Pivot International: (Contract Position)

April 2021 to June 2021: Senior Design Engineer for industrial products: Provided design support for worse case circuit analysis, test fixture design, test procedures, and Tester block and interface diagrams for industrial equipment used for remote tracking of equipment location and activity using LORA and Cell Modem Hub communications. Included DVM and serial UART data monitoring.

Progeny Systems: (Contract Position)

Nov 2020-Mar 2021: Senior Design Engineer for military products: Provided design support for power analysis and specification, as well as converter design/selection. Found method to change the power topology from six custom converters to only two custom converters. To enable this topology change, I did SPICE analysis and designed a fast turn-on boost converter that makes the lower voltage power sources compatible with the higher voltage sources. And I designed a low loss FET switch circuit that delivers power to the load function that becomes a low loss switching Constant Current limit regulator for current overloads. Studied and learned the product specifications, including related military specifications needed to do the power system design, and did a Traceability analysis. Supported another group’s design efforts on their product’s circuit design. Designed a FET circuit that works as an “OR” diode that reduces the diode power loss by a factor of four.

Lutron: (Contract Position)

Mar 2019-Nov 2020: Senior Application Engineer for LED lighting products:

Provided design support for LED Driver products that had failures at Customers. Included understanding the failure, doing design analysis to identify the cause of the failures, design circuit fixes that will eliminate the failure from the product line, doing lab testing to verify the fix, and guiding the fix through release into the factory.

ACI Industries: (Contract Position)

Oct 2017-Mar 2019: Senior Analog Design Engineer for Military products:

-Provided analog design on ultrasonic sensor technology for military aircraft. Isolated DC-DC converters, LDO regulators, Mil Spec compliance. Did Spice analysis of all circuits. Successfully correlated experimental data with Spice modeling. Product now in customer evaluation.

-Worked on a 5000W modular, redundant, current share power supply for the Navy. Completed OrCad schematic design of PFC and voltage output card cage blades with redundancy, current share, failure monitoring circuits. Designed with AC-DC Bricks. and DC-DC converters.

-Did design work on 300W housekeeping DC-DC converter using GAN and Silicon Carbide FET gate driver techniques.

OPTOLUM CORP: (Contract Position)

JAN 2016-AUG 2017: Senior Application Engineer in LED group:

-All of the following PCB activities use PAD’s Schematic and PAD s Layout software.

-Provided Application SPICE analysis circuit design to meet Customer requirements for Lumen output in LED lighting assemblies. Did PCB layout, and evaluation/testing of LED lighting assemblies, including Flicker measurements. Now in production.

-Designed and built 15W Off-Line LED current source Driver for LED lighting systems with very low Flicker. Now in Production.

-Designed 50W/2.5A Off-Line LED current source Driver for LED lighting systems. Did SPICE modeling for the entire power supply. Has <1% Flicker. Small space requirement 12”L x 1”W x 0.6 H” to fit in LED assembly. Completed UL testing.

-Designed LED lighting assembly to operate from the 50W Driver that has active LED current share.

- Spec’d battery AH and charging for max life in LED DC-DC application.

ON SEMICONDUCTOR:

Sept 2010- OCT 2015: Applications Group:

Staff and Principal Application Engineer for Dr Mos products:

-Provided Applications design and evaluation support for Dr Mos products. Also, provided conceptual ideas, circuit design, and project management support for new Dr Mos modules and DC-DC converters. Designed, programmed, and built an ATE tester for Application testing of Dr Mos products. Supported customer product development with Spice modeling analysis and bench evaluation on their designs.

-Worked closely with On Semiconductor’s Technology Development group providing design analysis for Dr Mos FET’s, including application testing on design variations.

-Developed a Dr Mos DC-DC converter plug-in daughter Demo card for Applications testing that allowed ATE testing of the Dr Mos module parameters without removing the module from the PCB. Reduced Demo Bd cost and Application evaluation test time.

-Patent Review Committee: Contributed review with design analysis on patent disclosure features, functionality, and comparison to existing patents.

-Supported Field and customers with analysis and reports on Dr Mos issues and performance.

-EMI: Designed and built EMI evaluation bds for studying ways of reducing EMI. Co-author on three papers with European R&D group.

-High speed logic design for ATE functions and control.

- ISO9000 training.

-Mentor Schematic entry.

-Designed buck-boost converters.

-Designed Lithium battery charging circuits. Tested Lithium battery AH capability.

March 2005-Sept 2010: FET Group. Senior Application Engineer for FET qualification; and customer support.

Provided design analysis, Application bench testing, and ATE testing on FET products, including the SenseFET, Trench 2 &3 products. Designed, programmed, and built an ATE for testing FET products on Application demo bds. Worked with customers on their applications, including visiting customers in China. Supported Field efforts for making FET products work reliability in customer board designs. Received awards for work on Trench 2 and 3. Developed an analysis/measurement methodology for determining the sensitivity of SenseFET accuracy to manufacturing variables. Designed and built an ATE FET tester for the SenseFET that accurately measured the Iratio vs circuit variations. Received patent on SenseFET compensation.

INTEL CORPORATION:

JANUARY 1998 – March 2005: Manager and technical leader of VRM/Power Pod group.

Supervised the work of the Plug-in Modules group which provides power to Intel CPU’s with VRM’s and Power Pod technology. Received recognition award for this effort. Worked closely with Power Pod vendors to solve issues with high current/fast transient load current delivery. Developed transient load test module (Slammer) to test the Power Pods by vendors and customers.

Set up EMI lab for engineering evaluation of computer system EMI. Got EMI certification on computer systems.

JANUARY 1997-JANUARY 1998: Technical Manager of Power Group.

Supervised the technical work of the Power Group. Visited Taiwan vendor to work technical issues and formulate new power supply technology and requirements. Worked with commodities to develop a specification and select vendors to integrate discreet on-board converter design into a chip. Served on the Servers Arch Council. Developed the Automatic Transient Suppresser (ATS) concept, which electronically suppresses voltage transients on any system’s power bus. Received patent for technique.

JANUARY 1991 - JANUARY 1997: Manager of Power Group

Assumed responsibility for power supply development for the Servers Group. At first, the group was only I and a technician, growing to a group of thirteen. Developed the Ripple Regulator DC-DC converter concept used for Pentium CPU power Received an award for this development activity.

Developed the current share concept now being used on off-line Servers products, and patent was granted for this technique. This current share was first used to make a low cost 525W power supply, where two 275W power supplies were designed into a single package and made to share on the +5V. Because of volume and component cost two 275W power supplies cost less than a single 525W design. Involved in the PFC design and loop stability. Was instrumental in selling the idea to Taiwan vendor. Worked overseas with Intel’s Taiwan vendor for two months on the engineering design of this product. Helped establish this vendor as a roadmap power supply vendor for Server products. Designed closed loop control for Hot Swap.

Led power supply design team to develop a 420W power supply with current share and hot-swap redundancy, including power factor correction. Invented a new current sense approach that is fast and accurate. Worked with Taiwan vendor’s engineers to interface the offline power supplies to the Hot Swap bus. Patents granted for both approaches.

Led a power supply design team to develop a low-cost power hot-swap distribution subsystem with current share sensing and loss-less current sensing approach for both current share and 240VA sensing. Received patents for both techniques. Designed current loop current share controller for Hot Swap loop stability.

Micro Controller design and code generation with assembly language/C.

Education:

Drexel University: M.S. B.M.E (MS Biomedical Engineering)

University of Kansas: B.S.E.E

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