Low-Noise tunable DC-DC converter for high-resistance thin film heaters

In this work, we present a low-noise tunable DC-DC converter designed for driving high-resistance thin film heaters (in the order of a few of k ). The converter features a two-stage design comprising a voltage-boosting initial stage and a subsequent voltage-regulating stage where carefully selected LC and RC filters are employed to achieve low output ripple and minimize electromagnetic interference. In particular, the first stage elevates the input voltage to 120 V, while the second stage enables precise voltage control using a PWM-controlled synchronous buck converter. Experimental results demonstrate linearity within 2–120 V, with sub-millivolt ripples and minimal high-frequency noise (below 10 mV). This converter offers a reliable power supply solution for precise temperature control, improving thermal management and performance of high-resistance thin film heaters for several applications.