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Internship - Design of a High Frequency Planar Transformer

Posted 15 Oct 2021

Work experience

0 to 1 years

Full-time / part-time


Job function


Degree level


Required language

English (Fluent)

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Which team will you become part of?

At Lightyear, our Engineering Team is divided into different domains. While this varies from Aerodynamics up to Software and from Mechanical Engineering up to Solar Engineering you’ll become part of the Domain focused on Power Electronics.

Being part of the Power Electronics domain, means you’ll become part of a team surrounded by Power Electronics Engineers. From there one, you’ll be allocated to a particular system which will be a multidisciplinary group of engineers. For instance, you could work on the inverter as part of our in-wheel motors or you could focus on the converter which is a key component of our solar roof. Your colleagues are working on 40kW SiC air cooled motor inverters and resonant converter MPPTs. Simply put, we can assure you that you’ll become part of an intrinsically motivated team because every team member chooses to join Lightyear’s mission. At Lightyear, people don’t settle for less and that’s what you’ll feel during your internship!

Some background information

At Lightyear we are constantly designing new types of power converters. With the rise of GaN the switching frequencies of these converters rises. This enables the use of very small high frequency magnetics. Planar transformers are a promising candidate of high frequency transformers since they can achieve very good coupling while also being cheap and reliable. However, with the increase of frequency the loss mechanisms and parasitic effects become increasingly difficult to model.  

Your personal mission

During this internship you will have to design a low loss, high frequency, planar transformer. You will have to find a way to model the transformer properties, including the loss components. This may be using FEM and/or an analytical approach. Using your models you are then tasked to come up with a transformer design that minimizes the losses while meeting all other requirements.

This will result in tasks as sequently described below;

  • Model a planar transformer including leakage and magnetising inductances and loss components
  • Minimize the transformer losses
  • Compare measured transformer properties to model

Requirements in order to achieve your personal mission

Be aware, being an intern at Lightyear isn’t just an internship. You’ll be approached as an actual engineer and that requires some skills. Especially given the fact that you’ll join a start-up where little is set in stone. Therefore, it’s key that you can relate to the following things:

  • You’ve proven that you’re strong theoretically and pragmatic. For instance, you’ve been part of a student team in the past or you did an outstanding internship. At Lightyear, we highly value this.
  • Academically, you’re outstanding and you understand the field of Power Electronics like no other.
  • You’re entrepreneurial. Really! You’re able to swim when we drop you into the ocean and you’re able to speak your mind. 
  • You breath Power Electronics. You should dream about converters!
  • You strongly identify yourself with our bigger mission: clean mobility for everyone 
  • You're currently pursuing your master's degree within Power Electronics and you're looking for an apprentice internship for a duration of around 3 months 

What do we offer

In addition to a challenging (graduate) internship you also have the opportunity to work for a company with a real, honest and ambitious mission. In this way you have the opportunity to make a huge impact on the future of mobility! In addition, we also offer:

  • A high degree of freedom and independence during your internship
  • A multidisciplinary team of highly motivated and talented people you can learn from
  • A certain internship allowance depending on educational level and type of internship
  • In addition to a dynamic working environment, there is time for relaxation during our already epic Friday (digital) afternoon drinks!

Curious about how our current Power Electronics Intern experiences Lightyear? Have a read below! 

I started with my Electrical Engineering master’s internship at Lightyear in 2020 as part of the Drivetrain team, followed by a graduate internship directly in 2021 as part of the Motors team. The things I value most at Lightyear are how honest and open-minded the people at Lightyear are. No idea is too crazy. On top of that, the outline sketched in the vacancy is true. Yes, you are indeed part of the team! No, you’re not working on some side project that nobody cares about. Yes, you can pitch ideas and be bold! Yes, it’s really people first here! Yes, people actually care to help you out (and you should not be afraid to ask). From the start, it has felt like a warm welcome and an enjoyable place to work, and it still feels like that after more than half a year. Both the people and the mission give me energy everyday. And of course, I learn a lot about electrical engineering, power electronics and motors.” - Jeroen Goudswaard

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About Lightyear
to company page

At Lightyear we are building an electric car that charges itself. From our experience at Solar Team Eindhoven, we know this is only possible starting from scratch. At Lightyear we bring together a multidisciplinary team of highly motivated engineers, designers, and visionaries to challenge the status quo. Write the story with us!

Active in 10 countries
200 employees
70% men - 30% women
Average age is 35 years

What employees are saying

Manuel Ribeiro

Software Engineer

Manuel Ribeiro

"Lightyear is an exceptional team that puts together people from all over the world with the same goal of creating a meaningful positive impact in our society. I felt welcome from the very first day and working with such motivated engineers gives me the energy I need to do my best every day."

Sapfo Tsoutsou

Group Lead - Thermal Engineering

Sapfo Tsoutsou

"Lightyear is een geweldig bedrijf om voor te werken. Het voelt voor mij meer als familie dan een werkgever. Klinkt misschien een beetje heftig, maar het is zo. Je maakt makkelijk vrienden op werk: iedereen is vriendelijk, behulpzaam en zo gemotiveerd om echt een verschil te maken in de wereld.”