Hi there! I do affordable electrical engineering work.

My name is Sierra and I’m an electrical engineer. My degree is a BS in EE with an emphasis in control loop design. I have extensive experience in power electronics design, RF/microwave circuit design, analog circuit design, PCB layout, and EMC compliance.

I’ve been in this field for about 17 years. I’m based in the US and am a native English speaker. I meet with clients on Google Meet and Zoom primarily and can voice and video chat with you as needed. I’m happy to design parts of a product for you, do prototyping to test out the feasibility of an idea, or just discuss how to solve a problem you encountered with your project.

I collect electronics test equipment and also have machine shop facilities with a lathe and CNC milling machine for mechanical prototypes. I also own a 4K Resin printer for making high quality plastic-like parts.

Contact me at sierra@ilovepowerelectronics.com
I’ll respond in one day or less. View my resume here.

Control logic for 2kA pulsed TIG welder with pulse forming

ABOUT ME

AFFORDABLE POWER ELECTRONICS, EMC, AND RF ENGINEERING

Engineering has always been a hobby for me first and formost before it became my career so my enthusiasm is high. I don't just view this as a job - it's a great passion of mine. I’d be happy to hear what you’ve got regardless of the project. I’ll let you know if I’m interested with no obligation. Most of what I do for fun is mechanical and electrical engineering work but I often start new projects before I finish existing ones. Having clients to do consulting work for helps keep me on track with deliverables and deadlines (which I’ll try my best to meet) while also allowing me to make a little money to finance my own projects.

I’ve been interested in engineering since age 7 or so. I started building simple circuits on breadboards around that age. My interest continued into high school where I entered several regional science competitions and was fortunate enough to eventually place in ISEF – the Intel Science and Engineering Fair. I decided to attend engineering school and chose to study electrical engineering due to my passion for design and creation. While in school I was offered an internship at a local engineering company that does mainly RF and microwave design. I worked for them for 10 years before deciding to open my own consulting business. In my personal time and as a consultant I have worked on a variety of both power electronics engineering projects as well as RF projects. I eat, sleep, and breathe this stuff and have since around age 12.

1kW AC to AC Arbitrary Waveform Generator/Inverter

Switching power supplies

15 years experience in SMPS, PFC, and inverter design. Designs that deliver from 1 watt to >50kw in pulsed applications. Sine wave synthesis with low harmonic distortion into non-linear loads.

RF engineering

10 years experience in RF and microwave design up to 24GHz. Cascade analysis and receiver design. Printed antenna and filter design. Hybrid PTFE and fiberglass stackups up to 10 layers.

EMC/FCC compliance issues

Conducted and radiated emissions reduction for industrial and consumer products. Product safety design for UL and CE certification.

SPECIFICS

• Switching power supply design. Resonant, full bridge, forward, flyback, LLC, PSFB, ZVS/ZCS, buck, boost, etc.
• Power factor correction (PFC) design.
• Motor driver design. VFD design.
• DC-AC Inverter design.
• Hysteretic voltage and current mode control design.
• Deadbeat current mode control design in DSP control loops.
• PID control loops.
• “Classical” Voltage and current mode control loop design for “analog” switching power supplies.
• Digital control loop compensation. DSP firmware design for switching power supplies, inverters, and motor controllers.
• Transformer and inductor design with ferrite, powered iron, laminated steel/iron cores.
• Simulation of magnetic structures including transformers, motors, and electromagnets in FEMM.
• Experience with MOSFETs, IGBTs, SiC, GaN transistors, etc.
• Experience fixing “OMG it keeps exploding!!!” problems.
• PCB design for power electronics. Loop size reduction, optimization of paracitics for high efficiency in switching power supplies and inverters.
• Heat dissipation design for pulsed semiconductor applications. Transient thermal impedance calculation and parts selection for pulse survivability.
• UL and CE safety including clearance and creepage requirements.
• Conducted and radiated emissions improvement. Common mode and differential mode filtering. Star grounding considerations.
• DC-DC power conversion for solar applications with and without isolation.
• Analog electronics design of amplifiers, current sources, level shifters, RF detectors, etc.
• RF LNA and signal chain design. Printed filters for RF applications.
• Impedance control and signal integrity for high-speed digital systems.
• Design and troubleshooting of UL and FCC compliance issues.
• Technical writing including artwork and text for patent applications.
• Mechanical CAD and CAM work including FEM analysis of mechanical structures, heatflow analysis, etc.

Analog and RF electronics for Blend Electrolysis Machine

Inductive Proximity Sensing and DSP Control for Electromagnetic Levitation

Custom CNC Gantry Milling Machine

Constant Current Boost LED Driver

200A IGBT Full Bridge

Pulsed Inductor Saturation Tester

I Love Power Electronics

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