WEE Technology Company Limited - WEE are Capacitors Specialist

WEET DC Film Capacitors MKT CL20 Axial Flat Type 100V 250V 400V 630V For Audio Hifi Applications
How to understand the Series number of Chinese capacitors?

Capacitor is one of the most widely used electronic components in electronic equipment. It is widely used in isolation, coupling, bypass, filtering, tuning circuit, energy conversion, control circuit and so on.
Frequency characteristics of capacitor: with the increase of frequency, the capacitance of general capacitor presents a law of decline.

Naming method of capacitor model: (according to GB2470-81)
The first part: letter the product name C
The second part: the medium materials of products are indicated by letters

A: tantalum electrolysis 
B: nonpolar film 
C: high frequency ceramics 
D: aluminum electrolytic capacitors
E: other materials electrolysis 
G: alloy electrolysis 
H: paper film composite 
I: glass uranium 
J: metallized paper dielectric 
L: polyester and other polar organic film 
N: niobium electrolysis 
O: glass film 
Q: paint film 
S, T: low frequency ceramics 
V, X: mica paper y mica 
Z: paper. 

Note: when B is used to indicate other capacitors except polystyrene, a letter should be added after B to separate specific materials. Such as CBBxx
When L is used to represent the capacitance of other films other than polyester, the method is the same. CLxx

WEE Technology Company Limited - WEE are Capacitors Specialist

CL refers to a type of film, that is polyester film, then CL capacitor refers to polyester film capacitor. 
The common CL capacitors are as follows: CL21 polyester film capacitor, CL21X ultra small polyester film capacitor, CL20 axial polyester film capacitor, etc.

Advantages of CL polyester film capacitor:

1. Small size.
Compared with CBB polypropylene film capacitor, the size of CL capacitor is smaller under the same capacity and voltage. For some places with high requirements for installation space, this feature of CL capacitor is very practical.

2. Higher temperature resistance.
CBB polypropylene film capacitor better can withstand 105 ℃ high temperature, but CL capacitor can withstand 125 ℃ high temperature, if used in higher temperature occasions, CL capacitor will have some advantages.

3. It's cheaper.
Compared with CBB capacitor, the price of CL capacitor will be slightly lower.

The disadvantages of CL polyester film capacitor are as follows

CL capacitors have both advantages and disadvantages. High loss is its biggest disadvantage, especially in high frequency circuit, which is not as good as CBB capacitor.

WEE Technology Company Limited - WEE are Capacitors Specialist

What is the Difference Between Metallized Polyester Film CL Capacitors and Metallized Polypropylene Film CBB Capacitors

Polypropylene film capacitor is an inductive structure, which is made of polypropylene as dielectric and aluminum foil as electrode. The conductor is tinned copper clad steel wire and epoxy polypropylene film capacitor is used.

Characteristics of Polypropylene Film Capacitor:

• Small volume and light weight;

• Better stability and reliability.

• The lead wire is directly spot welded to the electrode with low loss.

• It is widely used in the DC and pulse circuits of TV sets, radio recorders, DVD and various communication equipment and electronic instruments.

Polyester film capacitor is also known as CL capacitor, and polypropylene film capacitor is also called CBB capacitor. The two types of capacitors are well differentiated from each other. 
Generally, polyester film capacitor starts with CL, while polypropylene film capacitor starts with CBB. Both of them have the characteristics of self-healing and insensibility.

The main differences between CL and CBB are as follows:

1. The stability of CBB capacitor is higher than that of CL capacitor at high frequency.

2. Under the same temperature change condition, the range of CBB capacitance changing with temperature is smaller than that of CL capacitance.

3. The loss of CBB capacitor is smaller than that of CL capacitor. At the frequency of 1kHz, the tan δ of CBB capacitor is less than 0.001, while that of CL capacitor is less than 0.01.

4. The insulation performance of CBB capacitor and Cl capacitor is particularly good, which is better than other capacitors, while the insulation performance of CBB capacitor is better than that of CL capacitor. For example, when the capacity is less than 0.33uf, the insulation resistance of CBB capacitor is greater than 25000 m Ω, while that of CL capacitor is greater than 7500 m Ω.

5. Compared with CBB capacitor, CL capacitor  has the advantage of small volume. Under the same voltage and capacity, the volume of CL capacitor can be smaller than that of CBB capacitor, which is very useful for customers with limited installation space.

As CBB capacitor has better performance, but its price is more expensive, so there are many CL capacitors in the market that can not be found out by visual inspection. Therefore, Zongqiang Electronic Engineer recommends the following two methods for your reference:

1. Measure the loss value. If it is less than 0.001, it is CBB capacitor, otherwise it is CL capacitor.

2. Conduct the test with palm digital capacitance meter and hair dryer. First, put the capacitor on the capacitance meter to measure the cold state capacitance value, then heat the capacitor with the air blower, and then measure the capacitance value. If the capacitance value changes too much, it is CL capacitor, otherwise it is CBB capacitor

WEE Technology Company Limited - WEE are Capacitors Specialist

CL19 is non inductive structure, which is made of metallized polyester film as electrolyte / electrode. 
The conductor is made of tinned copper clad steel wire, the outer layer is wrapped with polyester tape, and both ends are sealed with epoxy resin.

1. Wide capacity range
2. Small size, light weight
3. Excellent self-healing performance
4. It is suitable for DC and VHF signal isolation, bypass and coupling
5. Widely used in filtering, noise reduction, low pulse circuit

Below is  WEET MKT WMA 100V Axial Lead Metallized Polyester Film Capacitor (CYCLOIDAL) CL19 China Part Number Common values in 100VDC.

WEE Technology Company Limited - WEE are Capacitors Specialist

WEET WMS - Non-Polarized 1000H at 105°C, DF at Max 10% BP Axial Aluminum Electrolytic Capacitors for Audio Applications

Below is WMS hot and common capacitance, free samples on request, welcome to contact with WEET capacitor. 

WEE Technology Company Limited - WEE are Capacitors Specialist

WEET MEA MKT MPE CL19 Axial Metallized Polyester Film Capacitor CYCLOIDAL Round Shape Applications generally are suitable for blocking, by-pass, coupling, and decoupling, also suitable for DC impulse and pulse circuit

WEET WMA type Capacitors are Metalized polyester film, non-inductive type, axial. Small size, light weight, excellent self-healing property. Wrapped with polyester adhesive tape and ends filled. High reliability, high capacitance, excellent electrical

characteristic

WEET WMA Audio Capacitors Main Material and Sturcture.

A: Dielectric : Polyester Film

B: Electrodes : Metal Vapor Coating

C: Encapsulation : PET Tapes(UL94V-0)

D: Epoxy Resin Coating(UL94V-0)

E: Lead : Tinned Copper Clad Steel Wire

F: Metal Spray Layer

WEE Technology Company Limited - WEE are Capacitors Specialist

Automotive audio capacitor refers to the electrolytic capacitor used in automotive audio auxiliary circuit. It is an auxiliary component for high-end car audio CD player and MD machine to improve audio restoration quality. There are three main functions in the circuit.

First of all, it can achieve the function of filtering. Because the capacitor has the characteristic that the voltage at both ends of the electrode can not change suddenly, the noise wave in the power supply is absorbed by the capacitor, so that it is suppressed before the power circuit enters the host and amplifier circuit of the car audio.

The second is the effect of signal coupling. The basic function of a capacitor in a circuit is to allow only alternating current to pass, not direct current to pass through.

The audio information signals flowing in the main unit and power amplifier of automobile audio are AC signals within a certain frequency range. Only when the AC signals form a loop can they be passed and amplified.

The function of capacitor is not to change the DC parameters of the circuit, so that the circuit AC path more smooth, so that the audio signal in the very weak signal can also be amplified, because the signal loss is smaller, the sound quality is higher.

In addition, the most important function of car audio capacitor is energy storage. The energy storage function of the capacitor also makes use of the characteristics that the voltage at both ends of the capacitor can not produce sudden change. When the power amplifier outputs high power energy, due to the energy storage function,

It can make full use of its fast dynamic characteristics to supplement the power amplifier circuit, reduce the instantaneous power supply voltage drop, and create necessary working conditions for the normal operation of the power amplifier.

WEET WMM - Bi-Polarized 1000H at 105°C, DF at Max 5% BP Axial Aluminum Electrolytic Capacitors for Audio Applications

WEET WMS - Non-Polarized 1000H at 105°C, DF at Max 10% BP Axial Aluminum Electrolytic Capacitors for Audio Applications

WEE Technology Company Limited - WEE are Capacitors Specialist

Do you know, why Axial Aluminum Electrolytic Capacitors must know the polarity? The capacitance of the capacitor is inversely proportional to the square of the distance between the two electrodes and is proportional to the area. The polarity of electrolytic capacitor is determined by the characteristics of its medium (insulator). The medium of electrolytic capacitor is metal oxide film, that is, the electrolytic (DC) process forms an oxide film on the surface of aluminum foil. Because the oxide film is very thin, the capacity of electrolytic capacitor can be very large. If the polarity of the capacitor is reversed, the electrolytic film will be destroyed under the reverse voltage, and the capacitor will fail. Therefore, the electrolytic capacitor has polarity.

WEET WAA  85°C, Low Leakage, 2000 Hours , Polarized Axial Aluminum Electrolytic Capacitor Common Items are as below. WEET is the earliest  Polarized Axial Aluminum Electrolytic Capacitor factory in China. 

WEE Technology Company Limited - WEE are Capacitors Specialist

Because it is coated with a metal layer on the porcelain tube, two poles are formed inside and outside. Because the tube is empty, it is called through center capacitance. It is a kind of three terminal capacitor, but compared with the common three terminal capacitor, because it is directly installed on the metal panel, its grounding inductance is smaller, and there is almost no influence of lead inductance. In addition, its input and output terminals are isolated by metal plates, eliminating high-frequency coupling. These two characteristics determine that the through core capacitor has the filtering effect close to the ideal capacitance. Moreover, it is an ideal device for interference filtering.

CBB19 is a non inductive structure, which is wound with metallized polypropylene film as dielectric / electrode. The lead wire is made of tinned copper clad steel wire, the outer layer is wrapped with polyester tape, and both ends are filled with epoxy resin.

How to select the capacitor in the audio circuit. In the audio circuit, there are four capacitors, which are coupling capacitor, frequency dividing capacitor, bypass capacitor and filtering capacitor. WEET engineers will introduce the above four capacitors category in next passage. Please follow us, thank you.

WEE Technology Company Limited - WEE are Capacitors Specialist

Strong Items in 630VDC CL19, CL20, CBB19, CBB20:

WEET WAA 1.0uF 630VDC 5% MKT Polyester 

WEET WAB 4.7uF 630VDC 5% MKT Polyester 

WEET WAC 2.2uF 630VDC 5% MKP Polypropylene

WEET WAD 2.2uF 630VDC 5% MKP Polypropylene