About this role
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About this opportunity
Modern electronic systems can change their power consumption very rapidly. A switching power supply may provide sufficient average power but still experience output-voltage droop when a large load is enabled suddenly.
Conventional solutions include increasing output capacitance, raising the pre-charge voltage, increasing converter bandwidth, or using a larger power stage. These approaches can increase size, cost, losses, EMI, or control-loop stability problems.
This project will investigate whether a predictive pre-charge and auxiliary current-injection circuit can provide better transient performance while allowing the main SMPS to remain optimized for efficient average-power conversion.
What you will do
To design, simulate, and experimentally evaluate a hybrid transient-support circuit that reduces power-supply output droop during rapid load transitions. This is a thesis suitable for two students.
Proposed technical approach
Characterize the existing SMPS and identify the causes of output droop.
Develop a model of the converter, output capacitor, load, and pre-charge circuit.
Design a controlled auxiliary energy-storage and current-injection stage.
Add feedforward from the load-enable or load-current signal.
Develop feedback to regulate output voltage and auxiliary current.
Investigate adaptive pre-charge levels for different load conditions.
Analyze interaction between the SMPS control loop and the fast correction loop.
Validate the design using laboratory measurements.
The skills you bring
Mathematics; differential equations, small-signal modeling, feedback and control theory.
Electronics; MOSFET transistor behavior, PWM and current mode control, inductor, transformers, and capacitors.
Simulation skills; LT-spice, MATLAB/Simulink, and Python
Why join Ericsson? At Ericsson, you´ll have an outstanding opportunity. The chance to use your skills and imagination to push the boundaries of what´s possible. To build solutions never seen before to some of the world’s toughest problems. You´ll be challenged, but you won’t be alone. You´ll be joining a team of diverse innovators, all driven to go beyond the status quo to craft what comes next.
What happens once you apply? Click Here to find all you need to know about what our typical hiring process looks like.Encouraging a diverse and inclusive organization is core to our values at Ericsson, that's why we champion it in everything we do. We truly believe that by collaborating with people with different experiences we drive innovation, which is essential for our future growth. We encourage people from all backgrounds to apply and realize their full potential as part of our Ericsson team. Ericsson is proud to be an Equal Opportunity Employer. learn more.
Primary country and city: Sweden (SE) || Lund
Req ID: 790699