Printed circuit board for compressor housing

The printed circuit board (PCB) (12) has first and second portions (20, 24) including two electronic components (22, 26) whose reference masses are on two voltage sources (14, 16). A third portion (28) is inserted between the first and second portions, and forms a potential barrier. A switching mode power supply (32) i.e. Flyback converter, connects the first and second portions together. A detecting unit (34) detects low power consumption of a microprocessor (30) of the second portion. A cutting unit cuts the switching mode power supply when predetermined low power consumption is detected. An independent claim is also included for a method for controlling a PCB.