1. CHANG CAO
440-TA Chatham Park Dr. Pittsburgh PA15220
Tel: 617-763-2599
Email: changcao11373@yahoo.com
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OBJECTIVE
Electrical engineer with over 20 years of experience and advanced degrees seeking opportunities to apply expertise in
firmware, analog and digital circuitry
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EXPERTISE
* Microprocessor Application (Microchip PIC, 8051, 8086, Freescale, TI MSP430)
• Firmware design, real-time embedded system
• C/C++, Assembly, HTML, Java script, Visual Basic
• A/D, D/A conversion, DSP
• Multitask control
• Data Communication (TCPIP, USB, I2C; RS232; UART, HTTP webpage communication)
* Hardware design
• Digital & analog circuit
• Loop control system
• Power supply
• Keypad input and LCD/LED/VFD display
* Other
• PCB layout (Allegro, Pads)
• Circuit Simulation
• Familiar with UL CSA standard and test procedure
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PROFESSIONAL EXPERIENCE
Dawar Technologies Aug.13 – present
Senior Electrical Engineer
Design new generation of touch controller. Led all phases of the design from design specification to final production,
Including design conceptualization, component selection, schematic and BOM creation, prototype making, PCB layout,
tuning and testing, products specification writing and support for production line and fields. And successful launched two
projects in the first year.
Phihong USA. Corp. Jan 08 – July 13
Senior Firmware Engineer
• Light sensor and lumen control
• Fan speed control: Reduce module cost from $3.50 to $0.75
• High-resolution (0.5%) LED dimming control
• Power Line Communication for Building Lighting System
• Add new features to TI POE firmware stack (MSP430F1481) to implement customer’s requirements
• Add new features to existing Freescale microcontroller (MCR908JK) for Power Over Ethernet Control
• Use Microchip PIC18F67J60 to implement TCPIP (HTTP web control, SNMP) for POE units: reduced cost of TCPIP
module board to $5
Transistor Device Inc. Jan 05 – Dec 07
Principal Electrical Engineer

2. • Use PIC18F4550 to implement charge/discharge control in a battery system: monitor and display battery
parameters as well as data logging; programming control of charge current/voltage based on feedback of battery
status; system self diagnostic; USB communication; Use Visual Basic to implement GUI to give a vivid image of
all battery parameters.
• Phase lock loop control for external frequency synchronizing with internal Pulse Width Modulation generator of an
AC/DC switching power supply. Use microprocessor to protect over-voltage, short-circuit, over-temperature,
over-current, under-voltage protections. I2C communication between PIC microprocessor and EEPROM
Leviton Manufacturing Co. Inc. Oct 02 – Dec 04
Electrical engineer
• Switching mode power supply: design flyback10W power supply; design transformer to improve power supply
efficient; use PAD to layout PCB; testing to check all parameters against spec.; UL submittal test
• HomePlug data communication: use PIC to do RS232 data communication, pulse controlled LED display
Cooper Wiring Devices April 99 – Sep 02
Project engineer
• Touch dimmer: ground-leakage-current detected for executing switch function or brightness adjustment; phase
control; soft start to reduce in-rush current; PCB layout with ORCAD
• Microprocessor controlled dimmer: phase control; soft start; communication between master and slave units
• Switching Power Supply: current-mode control, push-pull topology
Pentalpha Enterprises Ltd. Jan 97 – Mar 99
Electronic Engineer
• Digital Microwave Oven: controlled by microprocessor 8051; keypad input detection; VFD display; zero-crossing
detection; magnetron and turntable control; optocoupler isolation
• Digital Toaster Oven: controlled by microprocessor 8051; keypad input; LED display; clock synchronization;
thermistor sensor in temperature control feedback loop
• Bread maker: controlled by microprocessor 8051; multitask control; time slice allocation; feedback loop;
temperature sensor
Global Control Systems, Inc. Jan 92 – Jan 97
Electrical Engineer
• Barcode Decoder: controlled by microprocessor 8031; RAM/ROM expansion; photo-sensor sensors barcode
signal; built-in counter measures widths of barcode signals, algorithms for decoding barcode signal; LCD display;
activate executive mechanism; communication with data center.
• Uninterruptible Power Systems: 500W and 1KW; battery charge circuit; power line supervisory Circuit; half-
bridge inverter; PWM generator, fault protection and low-battery cut-off circuit.
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EDUCATION
Graduate Center of City University of New York
Master’s in Electrical Engineering, 1996
Field: Modern control
Status: Finished all electrical engineering PhD course work and passed PhD qualification examination
Shanghai Jiao-Tong University (top ranked university in China for engineering)
Master’s in Electrical Engineering, 1988
Thesis project: SPWM Drive of an AC Motor under control of a 16-bit 8086 microprocessor; Variable Voltage Variable
Frequency AC-DC-AC power supply; constant-flux/constant torque control; 3-phase half bridge (GTO) inverter;
symmetrical dual- polarity Sinusoidal PWM; voltage harmonics suppression; real-time event control; F/V curve piecewise
linearization; A/D, D/A conversion; Analog/Digital; Protection for over-current, over-voltage, low voltage, short-circuit,
GTO overheat
Bachelor’s in Electrical Engineering, 1982
Thesis project: Control of a Brushless DC Motor. Solid-state electrical commutating switching; magnetic sensor for rotor
position; logic circuit control for speed adjustment and speed direction control; feedback for speed stabilization