(2) Resistors

Resistors represent the basic component providing protection, ballasting, sensing, feedback, and signal attenuation in power electronics. Signal processing is the main contribution of resistors, in addition to high reliability and stability, which are required in such systems. Resistor manufacturers have made grea<sup>t</sup> e ffort to develop high-temperature resistors. Table 7 summarizes some commercially manufactured resistors with some short comments [16].



Metal foil resistors have high precision and stability in harsh environments, but the maximum operating temperature is limited to 240 ◦C due to the bondable chip, wire-wound resistors show quite good high-temperature characteristics, but they are not suitable for high frequency, and they act as inductors at high frequency. Thin film resistors seem to be an economical way with small size and good performance, but they are not suitable in overload conditions, whereas thick film resistors show superior overload characteristics [61].
