Portable cancer treatment using induction heating
Authors
Suarez Gonzalez, Andres ; Ruiz de Vega, Angel
Term
4. term
Education
Publication year
2012
Submitted on
2012-05-31
Pages
121
Abstract
Denne kandidatafhandling udvikler en resonant effektomformer til fremtidig brug i medicinsk hypertermi, en behandling der bruger kontrolleret induktionsopvarmning til at skade kræftceller. En højfrekvent spole drives af en halvbro‑baseret resonant omformer, hvor spolen indgår i en resonanstank (et kredsløb tunet til en bestemt frekvens for effektiv energioverførsel). Omformeren er designet, simuleret og opbygget i laboratoriet. Opvarmningsstrømmen reguleres ved at ændre MOSFET’ernes koblingsfrekvens (hurtige elektroniske kontakter). En mikrocontroller genererer et PWM‑baseret styresignal og indeholder en digital tilbagekoblingsregulator: Den måler spolens strøm, sammenligner med en brugerfastsat reference og justerer koblingen for at opnå den ønskede værdi. Af hensyn til sikkerhed er der udviklet en digitalt styret crowbar‑beskyttelseskreds, som afbryder systemet ved fejl. Den komplette opstilling er implementeret i laboratoriet, og testresultaterne præsenteres og diskuteres.
This thesis develops a resonant power converter intended for future use in medical hyperthermia, a therapy that uses controlled induction heating to damage cancer cells. A high‑frequency induction coil is driven by a half‑bridge resonant converter with the coil forming part of a resonant tank (a circuit tuned to a specific frequency for efficient energy transfer). The converter was designed, simulated, and built in the laboratory. The heating current is regulated by changing the switching frequency of MOSFETs (fast electronic switches). A microcontroller generates a PWM‑based control signal and implements a digital feedback controller: it measures the coil current, compares it with a user‑set reference, and adjusts the switching to achieve the desired value. For safety, a digitally controlled crowbar protection circuit disconnects the system if a fault is detected. The complete setup was implemented in the lab, and test results from the prototypes are presented and discussed.
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