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AdvancedMATLAB R2026a

11 kW LLC resonant on-board charger

A soft-switching resonant DC-DC stage that charges a 250–450 V battery from a 750 V DC link.

Full-bridge LLC charger: four MOSFETs on a 750 V DC link, series Lr and Cr, transformer with magnetising inductance Lm, diode bridge rectifier, output capacitor and 250–450 V battery
LLC charger topology with the resonant-tank values
Bridge voltage, resonant and magnetising currents, and rectified secondary current at 100 kHz
Waveforms at resonance: 750 V to a 400 V battery, about 11 kW
First-harmonic voltage-gain curves against switching frequency for several loads, with the 250, 400 and 450 V battery lines
Gain curves (Lm/Lr = 6) against the battery-voltage range

Aim

Simulate a full-bridge LLC converter at 100 kHz resonance with an isolated diode rectifier, and regulate CC–CV battery charging by varying the switching frequency.

What you’ll learn

  • How the Lr–Cr–Lm tank sets voltage gain (first-harmonic analysis)
  • Frequency control of an LLC converter for CC–CV charging
  • Zero-voltage switching of the primary MOSFETs
  • Choosing turns ratio and Lm/Lr for a wide battery-voltage range

Try it here

An interactive illustration of the idea behind this experiment.

How to run it in MATLAB Online

  1. Unzip the package we send you.
  2. Go to matlab.mathworks.com and sign in (campus licence or MathWorks trial).
  3. In MATLAB Drive, click Upload and choose the unzipped folder.
  4. In MATLAB Online, open the folder and double-click the model (.slx) or run the start script named in README.
  5. Press Run. Results appear in the scopes, dashboard or figures.

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