What film capacitors are commonly used in electronic ballasts and LED power supplies?

Film capacitors can be used in many fields, of which the largest use in the lighting field. There are two main types of film capacitors, one is polyester film and the other is polypropylene film, they have the advantages of stable capacity, high reliability, high insulation resistance, low loss, self-healing, low price, etc. They are widely used in electronic ballasts and LED power supplies.

 

Currently, the main commonly used ones are CL21 metallized polyester film capacitors, CBB21/CBB21B metallized polypropylene film capacitors, CBB81 high-voltage metallized polypropylene capacitors, and X2 metallized polypropylene film capacitors.

 

CL21 has been replaced by CBB21 capacitors for the most part, and is not used much anymore.

 

CBB21. CBB81 are non-inductive capacitors, suitable for use in higher frequency occasions.

 

X2 belongs to the safety capacitors, is made of metallized zinc-aluminum polypropylene film, its surge voltage resistance is very strong, generally used in the input power filter.

 

 

The use temperature of film capacitors:

 

Temperature is one of the most critical factors affecting the life of film capacitors, the use of ordinary film capacitors is -40 ℃ ~ +85 ℃, UF Capacitor film capacitor manufacturers of the capacitor's maximum temperature is 105 ℃, in the use of, try not to temperature is too high, the higher the temperature, the film capacitor's actual service life is also the shorter. Also note that the value of the rated voltage is valid only when the ambient temperature is ≤ 85 ℃, and it should be used at higher temperatures to reduce the amount.

Many people will be concerned about the heat generation of film capacitors. Do CBB film capacitors get hot or not?

 

1. CBB film capacitors do heat up, but the amount of heat is not large.

 

Theoretically speaking, CBB capacitor will not heat up, because it belongs to the energy storage element, theoretically it will not occur when using power loss, so it will not heat up. Ideal capacitor is no loss, but this is only ideal, the reality of the capacitor there is an equivalent resistance, which makes the ripple in the equivalent resistance to produce a change in the current. When the ripple voltage occurs at the two ends of the capacitor, it makes the voltage at the two ends of the capacitor change constantly and creates a varying current, or even intermittent pulsating power, which makes the polarons in the dielectric material of the capacitor oscillate, which generates heat and leads to heating of the capacitor.

 

So although theoretically speaking CBB film capacitors do not produce heat, but in fact will heat up, but the heat will not be too large, the heat is not very obvious, the life of the capacitor does not have much impact.

 

2.CBB film capacitors work why will be obvious heat?

 

 

Possible reasons: ripple current is too large, withstand voltage is too high and so on, these are capacitors modeling improperly lead to, CBB film capacitors modeling error, may indeed lead to capacitance work when the obvious heat.

 

Possible cause two: CBB film capacitors around other heat-generating electronic components, due to heat dissipation is not smooth, resulting in CBB capacitor temperature, this belongs to other electronic components caused by heat conduction.

 

Possible cause three: bought a cheap poor quality CBB film capacitors, due to the price war, many small factories without brand CBB capacitors will use poor quality film, this film is easy to breakdown, the aging of the medium is too fast, the life expectancy is also reduced, if serious, it will become a thermal breakdown, resulting in damage to the capacitor. So buy  poor quality CBB capacitors may appear capacitor obvious heat, short life, easy to damage the phenomenon.

 

UF Capacitors is established since 1995, as one of the professional China Capacitor manufacturer in China, we are strong in complete management, strict quality control system, and excellent sales service. UF Capacitors supply high quality Capacitors ,help customers cost down 20%-50%.

 

 

UF Capacitors is an ISO9001-certified manufacturer in China, founded in 1995. We hold military 

qualifications for tantalum capacitors, MLCC, and other products. Additionally, we have a UL-recognized 

test laboratory located at our factory site.

 

Our marketing position is to provide a superior alternative to firsttier brands such as TDK, Murata, 

AVX, EPCOS,Vishay, and Panasonic. We offer similar quality but at better prices, with faster lead times 

and excellent service. With extensive experience working with renowned international companies like GE, 

Philips, Jabil, and Flex, we have built a strong reputation.

UF Capacitors serves the consumer electronics, computing, communications, and industrial markets. 

As a professional Chinese electronic components manufacturer, we are dedicated to delivering high-quality 

electronic components, exceptional management, strict quality control systems, and excellent sales service.

 We strive to foster mutually beneficial partnerships and drive business growth.

 

Description	UF Capacitors Series Code	Vishay SPRAGUE	Kemet	Panasonic	TDK/EPCOS	Faratronic
Metallized Polyester Capacitors	CL21 Series	MKT368 Series MKT467 Series MKT468 Series	***	ECQV Series ECQE Series	B32520-B32529 Series B32591-32594 Series B32593-32594 Series	C21 Series
Box Type Metallized Polyester Film Capacitor	CL21B Series	MKT371 Series MKT372 Series MKT373 Series MKT373M Series	R66 Series R60 Series F611 Series F612 Series	***	***	C23 Series
Metallized Polypropylene Capacitor	CBB21 Series	***	***	ECWF Series	***	C31 Series
Box Type Metallized Polypropylene film Capacitor	CBB21B Series	MKP385（DC） Series KP1836（AC）Series	F461 Series F464 Series PMR-205 Series	***	***	C32（MKP21）Series
High Voltage Metallized  Polypropylene Capacitor	CBB81 Series	***	***	***	B32685-B32678 Series	C14 Series
Axial Lead Met Polyester Film Capacitors	CL19 CL20 CL23 CBB19 CBB20	MKT370 Series	C4G Series F5A Series F5B Series F5D Series	***	***	C22 Series
X2 Metallized Polypropylene Film Capacitor	X2 Series	MKP3382 Series MKP3384 Series MKP3392 Series	R46 Series PHE840M Series PHE850 Series PMR-209 Series	ECQU Series	B32921C/D-B32928C/D Series B81 130 Series	C42(E)MKP62 Series