polyester film capacitor represented by CL21 has small size and cost advantages, which is very suitable for low-frequency signal circuits of small home appliance control boards. It is not suitable for high-frequency pulse circuits, but it can play a stable role in signal bypass, timing and secondary filtering of low-voltage circuits.

small home appliance control board application: Typical applicable products include electric kettle control board, rice cooker control board, fan control board, humidifier control board and small charger control board. These circuits are mostly low-frequency signal loops and low-voltage auxiliary power supply circuits.

polyester capacitor application limits: It cannot be used for the primary side EMI filtering of mains power and high-frequency switching power supply main circuits. Under high-frequency and large ripple, the loss will rise rapidly and heat seriously, which will shorten the service life of the control board.

weidy CL21 capacitor reminds hardware engineers to reserve enough voltage margin when using polyester film capacitors on home appliance boards. It is recommended to do sample temperature rise test together with the whole machine to confirm that there is no abnormal heating under long-term working conditions.