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How To Make Non-Polarised Capacitors And Combin Non-Polarised Capacitors

How To Make Non-Polarised Capacitors And Combin Non-Polarised Capacitors

October 19 , 2023 0

I.A Brief Understanding OF Polar And Non-Polar Capacitors

Polarized and non-polarized capacitors are the same in principle, both are stored and released charge; the voltage on the pole plate (here the electric potential of charge accumulation called voltage) can not be changed suddenly.
The difference lies in the different media, different performance, different capacity, different structure resulting in different environments and uses. In turn, people according to the needs of production practice, experimental manufacturing of a variety of functions of the capacitor to meet the normal operation of a variety of electrical appliances and the operation of new equipment. With the development of science and technology and the discovery of new materials, better quality, diversified capacitors will continue to emerge.

POLARITY CAPACITORS: Polarity capacitors are capacitors that have positive and negative polarity, and they must be connected to the circuit with the correct polarity. Polarity capacitors are commonly used in DC circuits, such as power supply filter capacitors and coupling capacitors. Common polarized capacitors are aluminum electrolytic capacitors and tantalum capacitors.
Non-polarized Capacitors: Non-polarized capacitors are capacitors that have no positive or negative polarity and they can be connected in any direction in a circuit. Unpolarized capacitors are commonly used in AC circuits, such as coupling and bypass capacitors. Common types of non-polarized capacitors are ceramic capacitors and polyester capacitors.

1.The Medium Is Different

Dielectric? Usually it is the material between the two pole plates of the capacitor. Most of the polarized capacitors use electrolyte as the dielectric material, usually the same volume of capacitance polarized capacitor capacity. In addition, different electrolyte materials and processes to create a polarized capacitor with the same volume of capacity will be different. Then there is a close relationship between voltage resistance and the use of dielectric materials. Nonpolar capacitor dielectric material is also a lot, most of the metal oxide film, polyester and so on. Because of the reversible or irreversible performance of the medium determines the use of polarized and non-polarized capacitors environment.

2.Performance is different

Difference in performance mostly refers to the fact that most non-polarized capacitors are very different from polarized capacitors according to the different needs of product use and the need to meet customized functionality. As a filter can only use polarized capacitors, polarized capacitors are irreversible. That is, the positive pole must be connected to the high potential end, the negative pole must be connected to the low potential end. General electrolytic capacitors in 1 microfarad or more, do coupling, decoupling, power supply filtering and so on. Most of the non-polarized capacitors are below 1 microfarad, involved in resonance, coupling, frequency selection, current limiting, and so on. Of course, there are also large-capacity high-voltage, mostly used in electric power reactive power compensation, motor phase shifting, inverter power phase shifting and other purposes.

3.Structurally Different

In principle, a capacitor can be shaped in any way that is needed for the environment in which it is to be used, regardless of tip discharge. Electrolytic capacitors (polarized capacitors) are usually round, and square shapes are rarely used. Nonpolarized capacitors come in a wide variety of shapes. Tube type, deformed rectangle, chip type, square type, round type, combination of square type and round type, etc., depending on where it is used. Of course, there are invisible, here invisible refers to the distribution capacitance. For the distribution of capacitance in high-frequency and medium-frequency devices must not be ignored.

4.Differences In Use Environment And Application

Because of its internal materials and structure of the relationship, polarized capacitors (such as aluminum electrolytic) capacity can be made very large, but its high-frequency characteristics are not good, so it is suitable for power supply filtering and other occasions, but there are also high-frequency characteristics of polarized capacitors - tantalum electrolytic, which price is relatively high.
Non-polarized capacitors are small in size, low in price, good high frequency characteristics, but it is not suitable for large capacity. Like porcelain capacitors, monolithic capacitors, polyethylene (CBB) capacitors are, porcelain capacitors are generally used in high-frequency filtering, oscillating circuits more.
Magneto-dielectric capacitors are capacitors with ceramic material as the dielectric and a silver layer burned on the surface as the electrode. Magneto-dielectric capacitors have stable performance. Loss, leakage are very small, suitable for high-frequency and high-voltage circuit applications.
Generally speaking, the insulating material between the two poles of the capacitor, dielectric constant (such as ferroelectric ceramics, electrolyte) is suitable for the production of large-capacity, small-volume capacitors, but the loss is also large. Dielectric constant of small (such as ceramic) loss is small, suitable for high-frequency applications.

II.Three Ways To Combine Non Nonpolar Capacitors

1.Series Connection Of Two Positive Or Two Negative Poles Of The Polarity Capacitor

Connect two capacitors of the same capacitance, same voltage level, but opposite polarity to the other terminal to form an equivalent non-polarized capacitor. Note that the polarity of the two polarized capacitors need to be placed in the same direction in order to connect them correctly in series.

2.Series Connection Of Two Capacitors And Two Positive And Two Negative Poles

If we have two capacitors with different capacitance values (but similar sizes), the same voltage level, and different polarities, then we only need to connect one of the two capacitors with the same polarity, and the other with the opposite polarity, the resulting capacitance effect is equivalent to a non-polarized capacitor.

3.Connect Two Capacitors In Series With Two Positive Or Negative Terminals.

If we have two capacitors with different capacities and the same voltage level, and they are both polarized capacitors, please connect them in parallel, but we need to make their polarities in opposite directions. After that, we can just connect the two positive terminals together or combine the two negative terminals. In this way, any non-polarized capacitor with a specific capacitance value requirement can be made.

III.Way To Make A Non Nolarized Capacitor

Step1：

Gather the materials: You will need two sheets of metal, such as aluminum or copper, that can serve as the capacitor plates. The plates should be thin and flat for better performance. Additionally, you will need a suitable dielectric material, which is an insulator that goes between the plates. Common dielectric materials include paper, plastic, or mica.

Step2:

Cut the metal sheets: Use a pair of scissors or a cutting tool to cut the metal sheets into two identical shapes. The shape can be rectangular, circular, or any other desired shape. Ensure that the dimensions of the two plates are the same.

Step3:

Prepare the dielectric material: Cut the dielectric material into two identical shapes, matching the dimensions of the metal plates. Make sure the dielectric material is clean and free from any contaminants.

Step4:

Assemble the capacitor: Place one metal plate on a flat surface and carefully position one piece of the dielectric material on top of it. Then, place the second metal plate on top of the dielectric material. Ensure that the plates and the dielectric material are aligned properly.

Step5:

Create electrical connections: To complete the capacitor, you need to establish electrical connections to the metal plates. One option is to attach wires to the edges of each metal plate using soldering or by using conductive adhesive. Another option is to fold a small portion of each metal plate to form a tab, which can be used for connecting wires.

Step6:

Insulate the edges: To prevent the metal plates from coming into contact with each other, insulate the edges of the capacitor using electrical tape or any other suitable insulating material. This will help maintain the separation between the plates and prevent short circuits.

Step7:

Test the capacitor: Once the capacitor is assembled, you can test its capacitance using a capacitance meter or by connecting it to a suitable circuit. Verify that the capacitance value falls within the expected range for the given size and dielectric material.

It's worth noting that homemade capacitors may not have the same performance characteristics as commercially manufactured capacitors. Their capacitance values might be lower, and they may have higher tolerances and leakage currents. Therefore, if you require precise and reliable capacitance values, it is recommended to use capacitors manufactured specifically for the purpose.