Film capacitor is used, should pay attention to what?

Matters needing attention of film capacitor

1, the selection of working voltage film capacitor depends on the highest voltage applied, and the applied voltage waveform, current waveform, frequency, ambient temperature, Capacitor surface temperature) , the influence of factors 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, working current through the capacitor pulse ( Or communication) Current is equal to the capacitance C and the product of the voltage rising rate, is I = C x 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 MPES fold chip capacitor. PPS, MPPS, MPSA series high-pressure polypropylene film capacitor is given duty ratio ( 责任) Was 15% of the rated current fengfeng values. MPP, MPH, MPA 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 under the condition of use, polypropylene film capacitors in itself under the condition of temperature is 5 ℃ or less use, capacitor surface temperature is not allowed to exceed the maximum rated temperature.

3, flame retardancy, although outside the film capacitor encapsulation were used in the fire resistance - flame retardant materials - Flame retardant epoxy resin or plastic shell ( UL94 / V - Level 0) , but outside of the continuous high temperature or flame can still be outside the core deformation produced by the capacitor encapsulation is broken, and led to the condenser core melting or burning.

4, restrain power electromagnetic interference with capacitor when using capacitor to eliminate noise in power across the line, 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 a MKT61, MKP61 type capacitor safety certification. Is not recommended to capacitor used as capacitor across the line.

5. Depends on the capacitance of capacitor charging and discharging the capacitor charge and discharge current and voltage rise rate of the product, even if it is low voltage to charge and discharge, may also produce large moment of charge and discharge current, which can cause damage to the performance of capacitor, such as short circuit or open circuit. When the charge, please series a 20 ~ 1000 & Omega; / V or higher current limiting resistor, charge and discharge current limit within the prescribed scope. When more than one film capacitor in parallel to withstand voltage test and life test, please for each capacitor in series a 20 ~ 1000 & Omega; / V or higher current limiting resistor. See the capacitor for standard

6. Flame retardant: although outside the film capacitor encapsulation were used in the fire resistance - flame retardant materials - Flame retardant epoxy resin or plastic shell, but the outside of the continuous high temperature or flame can still be outside the core deformation produced by the capacitor encapsulation is broken, and led to the condenser core melting or burning.

7. The surface temperature rise ( △ T ） : 7. 1 when the capacitor is used in communication and pulse occasions, flowing through the capacitor current makes the fever, if the heat is too big, can lead to short circuit capacitor and even burn. So the current flowing through the capacitor cannot exceed the maximum value stipulated in the product catalog and capacitor when load monitoring temperature rise is particularly necessary.

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