My Portfolio¶

Detailed Experience¶

Altium Designer ECAD
4-Layer PCB layout, PCB panel design
Embedded system hardware & bare-metal firmware design, integration, test & validation
3ph PMSM sensor-less FOC motor drives
Constant current buck, boost LED drivers
PCBA functional test jig design
Pick & place, reflow & manual soldering of prototypes
LTSpice

Microcontrollers: TMS320F28027FPTT¹, STM32L011F4U6², STM32L011G4U6³, ATtiny817, MKL02Z32VFM4⁴, STM32F030K6T6⁵, MB9BF506R⁶, R5F212D8SNFP⁷
Emulator Tools: J-Link, XDS100V2, FRDM-KL02Z as SWD emulator & programmer, E8a
Production Flasher: Segger Flasher ARM, C2000 Gang Programmer
Raspberry Pi

Multimeter, Oscilloscope, Power Analyzer, DC Electronic Load, Signal Generator, Logic Analyzer, AC Power Supply, Torque Load Cell, Dynamometer
SCPI
PyVISA

Work on freelance electronics projects
Self-learning Machine Learning, OpenCV, Google Cloud Platform, Google Analytics, Firebase, Power BI

Led a team of 3 engineers, provided technical advices to team
Standardized NPI design workflows, guidelines, release specifications & documentations
Supervised & reviewed PCB/PCBA design ensured met design & cost requirements
Performed internal DFM/DFA review against suppliers’ capabilities and IPC compliance to find the balance between size/cost/performance/complexity
Promoted close rapport with mechanical design team ensured met all design aspects
Advised Manufacturing department and liaised with new PCBA contract manufacturer
Reviewed PCB/PCBA contract manufactures process matrix and reports
Prepared specifications & test plans for fan products, motors, LEDs, and auxiliary controls
Supervised design for BLE 5.0 Wall Control product
Designed General-Purpose 24V PCBA FCT Tester
Designed stator-mounted 24V/35W FOC motor drive

Ensured fan & motor designs meeting UL/CSA standards & Energy Star criteria
Performed DFMEA, design reviews & compiled lesson learned
NPI development for 52” BLDC ceiling fan - architected, planned, designed & tested complete multi-controller PMSM fan HW & FW with integrated LED lighting and LED panel
Oversaw PCBA functional test fixtures design, construction & maintenance
Standardized per-product basis internal Design Validation Plan and Report (DVP&R)
Mentored technician & established prototypes assembly workflow
Supervised low-power handheld BLE 5.0 Remote Control)
Refactored fan system FW code achieved high modularity, extensibility & portability
Sustaining engineering activities - product failures root cause investigation

Designed 3ph PMSM sensor-less FOC motor drives of 12V/30W, 200V/30W & 400V/30W ratings
Worked on 20W constant current buck LED driver & optimized illumination evenness
Developed PMSM fan system firmware, infrared decoding & AC powerline communication signal decoding firmware
Designed, assembled & commissioned PCBA functional test fixtures HW & FW
Creates & maintained design libraries, improved HW design collaboration using SVN

Designed, built & validated HMI, audio, control boards for PA/VA systems
Embedded C firmware development for HMI, voice alarm playback & audio signals routing & performed system-level integration
Developed proprietary TDM communication protocol firmware for multidrop serial bus

TI TMS320F28027FPTT - 32-bit, 60 MHz, InstaSPIN-FOC, 64KB flash (16-bit word), 12KB SARAM (16-bit word), LQFP 48 ↩
STM32L011F4U6 - 32-bit, 32MHz, ARM Cortex-M0+, Ultra-Low Power, 16KB Flash, 2KB SRAM, UFQFPN 20 ↩
STM32L011G4U6 - 32-bit, 32MHz, ARM Cortex-M0+, Ultra-Low Power, 16KB Flash, 2KB SRAM, UFQFPN 28 ↩
NXP MKL02Z32VFM4 - 32-bit, 48MHz, ARM Cortex-M0+, Ultra-Low Power, 32KB Flash, 4KB SRAM, QFN 32 ↩
STM32F030K6T6 - 32-bit, 48MHz, ARM Cortex-M0, 32KB Flash, 4KB SRAM, LQFP 32 ↩
Fujitsu MB9BF506R - 32-bit, 80MHz, ARM Cortex-M3, 512KB Flash, 64KB RAM, LQFP 120 ↩
Renesas R5F212D8SNFP - 16-bit, 20MHZ, 64KB Flash, 3KB RAM, LQFP 80 ↩