Takeshi Kuwahara Email & Phone Number

Tokyo, Jp

日本 神奈川県 川崎市

日本 東京

Support IXYS’s power semiconductor products for Japan and Korea market

日本 東京都 23 区内

Tokyo SEC (Solution Engineering Center)- Support for motor drive solution Hardware and software development Motor measurement system Motor driving algorithm analysis- Applicaton support BLDC(Brushless DC), BDC(Brushed DC) and Stepping Motor HVAC, EOP, EWP, FAN motor, Compressor (Home appliance, Automotive and Industrial area)- Power translation circuit Inverter, DC-AC, DC-DC.- PCB design Analog and digital mixed circuit- Software design Visual Studio C#, Arduino IDE- Circuit simulation P-SIM

日本 神奈川県 横浜市

Technology venture in power conversion and motor driving area.Hardware engineering - Motor driving, Power electronics » Developed inverter for electric motor assisted bicycle- Leading the development team for Bicycle product (Co-working with Nidec)- Developed discrete inverter circuit design and STM32 32-bit microcontrollers based MPU program. » Developed Myway pCUBE* (500V version) * pCUBE : 10 kW-class regenerative type direct current power supply- Hardware design, debug, product test for launching 500 voltage new version - Coordinated product test of whole unit and circuit level. (A/D adjustment for high precision), Test program- Participated production transfer with new partner Technical support, Improved yield rate, Documentation, Failure analysis- Motor test bench System design, Testing and Documentation

日本 東京都

Hardware engineering – Inverter, Motor driving, Plasma display » Home appliance inverter circuit design (2009-2012) - Developed inverter circuit for compressor driving. (4kW-class Air-conditioner outdoor unit, Refrigerator) - Developed 1-shunt sensor-less motor driving, bridge-less PFC Feasibility test of high efficiency and low cost circuit topology. - Developed IPM (INV+PFC, Super-Junction MOSFET) (Co-working with Mitsubishi, Sanyo, Rohm)- Researched SiC MOSFET and SBD for feasibility. (Co-working with Rohm)- Technical supporting for AC laboratory in ChangWong, Korea» Plasma display circuit design (2004-2008)- Initiate launching 2nd and 3rd PDP factory in Gumi, Korea. Failure-analysis investigation- Developed semi-customed semiconductor for PDP drive circuit. Hi-voltage Data and scan drive IC ,IPM, IGBT and HVIC (Co-working with Renesas, Fuji Electronics, Toshiba, Rohm, Panasonic)- Participated taks team for improving yield rate, cost ,quality issues and performance. (Co-working with Fuji electronics , Sanyo semiconductor, STMicro, Shindo, LG Inotech)- Lead development team for PDP in Japan Manage job between R&D in Korea and co-workers in Japan Direct report to R&D executive in Korea HQ- Technical supporting for Display laboratory in Seoul, Korea.

日本 神奈川県 川崎市

Hardware engineering – Plasma display» Plasma display driving circuit design (1996-2004) - Lead development team of 32 inch to 42 inch PDP series. - Participate circuit design, product quality test, customer support, plant support, documentation- Certificated Product Safety standard (IEC 60950/UL 60950) and Test - Open-short circuit test, AC Line noise, ESD test, Creation of the documents for a safety standard application, measured and improved electro-magnetic emission noise and mulfunction, Failure-analysis investigation- Developed IPM (Intelligent Power Module), HVIC (Hi-Voltage Integrate Circuit) and Gate coupler for discreat design PDP drive circuit. - Contributed mass product of ALiS(*1) driving method for world-fast High Definition PDP. Developed high voltage and high speed switching circuit design for sustainer circuit. (*1) 1st HD Plasma Display in the world- Developed LSI for display data conversion circuit- Customer support Solved various issues of using PDP module in TV unit. (EMI,Interface,Power supply) (TV supplier : Sony, Hitachi, Sanyo, Philips, Fujitsu-General) - Participated launching PDP module factory #2 in Miyazaki, Japan. Trouble shooting, Improve yield rate, Fault analysis

Hardware engineering – PC» Notebook PC design for North America market, ASIC design (1989-1996) - Developed PC circuit and estimated whole product Design UltraLite series :Intel 86 based Notebook PC. Perform mother board design- graphic controller for STN-LCD panel FPGA (Altera, Xilinx) and ASIC design, VHDL entry, - Supported technical issue PC assembly factory in Boston, U.S.A To improve failure rate in the market, failure analysis, repair program- Certificated Product Safty standard (UL 950) and test Creation of the documents for a safety standard application, Line noise, ESD test, EMI, power on/off sequence, power source break test