Part Name
AN2991
Description
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PDF
page
14 Pages
File Size
253.7 kB
MFG CO.
STMicroelectronics
AN2991 Datasheet - STMicroelectronics
STMicroelectronics
Introduction
Up to now, refrigerator compressors have been controlled by electromechanical switches (thermostat or even electronically controlled relays). This choice was driven by the high inrush current that can appear when the rotor is stalled. Furthermore, electromechanical relays were advantageous because they were less sensitive to line voltage disturbances. Today, new semiconductor devices feature overvoltage protection and high inrush current capability, allowing their use in cold appliances.
Electronic thermostats can now be implemented, allowing the appliance efficiency to be improved by more than 20 W, for 150 W compressors. This is possible because of the better temperature control and the PTC removal.
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