David Shi

Core Responsibilities: Act as battery and power expert. Lead battery, charger, board-level power, and motor drive R&D for robotic vacuum and mop product lines. Hardware design for iRobot Roomba product battery pack and power supply circuit hardware design. Collaborate with U.S. management, APAC local teams, and ODM suppliers on hardware design, EMI/ESD optimization, and failure analysis. Research/recommend/test and implement cost reduction improvements. Hands on design and qualification of power electronics subsystems for AC/DC, DC/DC converters, motor drivers. Hands on design and qualification of battery pack for cell selection, BMS PCBA design, SMbus communication define. Optimize TI/Renesas gauge configurations and SMBus communication with ODM software engineers. Hardware schematic design review and test report review. Manage relationship with New Product Introduction (NPI) teams to ensure the future roadmap has lessons learned from past projects. Lead and participate in multiple product development of electronics. Identify and understand system level risk and impact on customer experience with all aspects of a design. Assess and track end of life risks to components in cooperation with OEM/manufacturing and the supply chain organization. Ensure new product development meets product design specifications, quality requirements, and development schedule. Led development of LFP batteries (3Ah/5Ah/6Ah) and chargers for Roomba 105/205/405/505/705V/705C – all mass-produced. Completed 2600mAh NMC battery and charger for Roomba mini (PP stage). Roomba 115/415/515/605/805 entering mass production. iRobot mop products in development.

Work at Flextronics R&D (Shenzhen) Co., Ltd Lead hardware R&D for DC UPS (BBU) for Google and Amazon data centers. Hands on hardware design for Google and Amazon data center BBU (Battery Backup Unit) product based on customers' product specification requirements. Hands on design and qualification of power electronics subsystems for DC/DC converters, BMS circuit, MCU control logic and protection circuit. Hands on qualification of various electronic components, including micro controllers, DC/DC power IC, battery fuel gauge and AFE IC, amplifiers, magnetic components, Mosfets etc. Hand on hardware schematic design and check and optimize PCB layout design with PCB layout team. Hardware circuit debugging and testing, as well as the development of test fixture boards for production line test stations. Communicate with FAE of supplier to get support while encounter IC issue during development process. Hands on ESD, Surge, EMI design\test\analyze and contribute improvement methods. Define hardware solutions, evaluate new circuits, simulate using SIMetrix, design schematics and calculation worksheets. Oversee component selection, hardware debugging, testing, and test fixture development. Work with safety team to solve safety issue. Identify and monitor the project risks, track all open issues to closure. Create design calculation worksheet for responsible project. Delivered Google Gen1 4200W BBU (mass production), cost-reduced version, Gen2 5700W BBU (concept done). Contributed to Amazon BBU hardware.

Work at ABB Shenzhen new energy system Co., Ltd Lead new product introduction for EV Charger products that designed by NLABB R&D team. Technical maintenance of Denza wall-mounted and ABB floor-standing EV chargers (T13D, T23D, T53Z, T53Ze). NPI technical support. Analyzed R&D and production issues; provided failure analysis and solutions to make production line runs smoothly and with lower failure rate. Executed safety, ESD, surge, EMI tests and deeply involved rectification measures to help product pass EMC requirement. Collaborated with R&D, procurement, production, and quality teams to resolve all the issues and ensure smooth production. Product design issue verifies, report to NLABB R&D team, track issue resolve status, verify the solution from NLABB, and advise potential solution. Lead seeking China local alternative material and qualify it for cost cut purpose. Manage the BOM structure with ME\Sourcing team\warehouse. ECO management and BOM management.

Lead the design of set-top box power supply projects for PACE and power supply unit in EPSON printer, LCD TV power supply for Toshiba. Gathered requirements, developed technical proposals, selected components, created schematics. Create design calculation worksheet for responsible project, guide junior engineers. Execute safety, ESD, surge, EMI tests and deeply involved rectification measures to help product pass EMC requirement. Design proper magnetic component such as transformer and inductor to finished the project design task. Select key components such as MOSFET, IC etc. for the product design. Create circuit schematic and check PCB layout with PCB layout engineer to complete PCB design. Create and maintain project document related to R&D department Communicate with FAE of supplier to get support while encounter IC issue during development process. Identify and verify failure item in DV Report, confirm and provide solution to solve it.

Promoted from Senior Hardware Engineer to R&D Supervisor. Design for high power (100kW~630kW) solar inverter hardware, debug issues, select key component, self-testing, create calculation worksheets for hardware design. Guided testing/certification for PV inverters (TUV, CQC, CE, etc.) to European and domestic standards. Led a team of 7–8 engineers, assigned tasks, provided training, improve team work efficiency. PSU Qualification and Approval used in high power solar inverter. Create and execute Solar Inverter Test Plan for design team and production line test, such as electronic function test/Reliability test/Safety test/ Environment test. Create Component Derating Criterion for R&D department. Track and follow up design issue's closure process. PSU Specification Review.

Work Division&Department: Global Procurement Division/System Module Engineering/Electronic Component & Module Engineering/PSU Team Responsibilities & Achievement: Supported DELL, HP, Cisco, HUAWEI projects (ATX, TFX power, server/communication power supplies). Developed design guidelines and test methods for electrical performance and reliability. Audited and managed major power supply vendors (Delta, Liteon, Chicony, Bestec, AcBel, etc.). PSU Qualification and Approval. Signal Internality Test. Reliability Test. Failure Analysis. Components FAI. AVLC Management. Product Roadmap Collect and Analysis. 2nd Source Development. Supplier Evaluation (Technology and Process Quality). MCD Review and Approval.