Small, high efficiency, low cost appliance UPS

Study level


Master of Philosophy


Vacation research experience scheme

Topic status

We're looking for students to study this topic.


Dr Mark Broadmeadow
Division / Faculty
Science and Engineering Faculty
Associate Professor Geoff Walker
Acting Head of School
Division / Faculty
Science and Engineering Faculty


Design a small, high efficiency UPS that is able to interface with house hold appliances (for example a fridge, or TV/entertainment unit) or even lighting circuits. Whilst there is power available from the grid, the system will charge a battery as well as provide power to the appliance through an AC-DC-AC rectifier/unfolding circuit. Should the grid power become unavailable, the system will then almost instantaneously start providing power from the battery through an inverter.

The aim will be to produce the system at a minimal cost whilst still maintaining high efficiency. This system will allow investors to make smaller incremental purchases over time rather than the large upfront cost associated with current home battery systems. This work continues work done by a previous undergraduate thesis student.

Research activities

Existing UPS circuits follow a very similar formulae.  As part of your lit review, you can explore better topologies including the proposed AC-DC-AC rectifier/unfolding circuit with a haversine DC bus.  Simulate these using LTspice.  Implement the control using C software on a microcontroller or DSP, controlling a three phase IGBT IPM module.


  • For a VRES project, review, improve and complete the existing UG thesis project.
  • For a PhD research project, explore the integration of a multilevel battery converter structure into this UPS.

Skills and experience

  • HW and/or SW Electronics experience, depending on your focus.
  • LTspice for electronics simulation
  • for PCB layout, Altium is highly desirable but not essential.


You may be able to apply for a research scholarship in our annual scholarship round.

Annual scholarship round



Contact the supervisor for more information.