The use of film capacitor we should pay attention to what problem

The use of film capacitor note

1. Working voltage, high voltage film capacitor to choose depends on, and by applying the voltage waveform, current waveform, frequency, environment temperature, Capacitor surface temperature) And the influence of the factor such as the capacitance. Before use, please check at the ends of the capacitor voltage waveform, current waveform and frequency ( In high frequency, allowing with different types of capacitor voltage change, details please refer to the manual) Whether in the rating

2. Pulse electric current through the capacitor (work Or communication) Current is equal to the capacitance C and the product of the voltage rising rate, namely I = C× dV/dt 。 Because the capacitor loss, under the condition of high frequency or high pulse when used by pulse capacitor ( Or communication) Current can make the condenser heat and temperature rise, there will be thermal breakdown ( Smoke and fire) The danger. Therefore, the capacitor safety conditions of use not only by the rated voltage ( Or category voltage) Restrictions, and restricted by the rated current. Rated current is considered to be determined by the breakdown model of pulse electric current ( Peak current, that is limited by the index of dV/dt) And continuous current ( Expressed in fengfeng values or RMS) Composition, when using, must make sure both current within the scope of the permit. Under the condition of high frequency or high pulse capacitor used, we recommend polypropylene film capacitor or CL23B fold chip capacitor. CBB81 are, CBB81B, CBB81A polypropylene film series high voltage capacitor is given duty ratio ( 责任) Was 15% of the rated current fengfeng values. CBB21, CBB21B, CBB21A series S correction capacitor rated fengfeng value current is given. Under no circumstances do not allow more than the rated value of fengfeng current use. When actual working current waveform and the waveform is not at the same time, given the polyester film capacitor in their temperature is 10 ℃ or less use, under the condition of polypropylene film on its temperature rise is 5 ℃ or less use, under the condition of the condenser surface temperature no more than rated maximum temperature

5, inhibiting power electromagnetic interference with capacitor

5. 1 when used in power possible cross line circuit capacitor to eliminate noise, not only the normal voltage, there will be abnormal pulse voltage ( Like lightning) Smoke or fire happens, this may lead to capacitor. Line across the capacitor, therefore, its safety standards in different countries have strict rules. Please use after X2 - safety certification MKP X2 - MKT CBB6 type capacitor. Capacitor are not allowed to be used as a capacitor across the line.

5。 2 X2 class power electromagnetic interference suppression with capacitor is suitable for the capacitor fails will not lead to dangerous situations, such as power across the line connection, affordable 2. 5 kv pulse.

5。 3 Y2 class power electromagnetic interference suppression with capacitor is suitable for the capacitor failure will lead to dangerous situations, such as power across the line connection, can withstand 5 kv pulse.
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