Capacitors Blog

Suntan Technology Company Limited
---All Kinds of Capacitors

In a way, a capacitor is a little like a battery. Although they work in completely different ways, capacitors and batteries both store electrical energy. If you have read How Batteries Work, then you know that a battery has two terminals. Inside the battery, chemical reactions produce electrons on one terminal and absorb electrons on the other terminal. A capacitor is much simpler than a battery, as it can't produce new electrons -- it only stores them.

In theory, the dielectric can be any non-conductive substance. However, for practical applications, specific materials are used that best suit the capacitor's function. Mica, ceramic, cellulose, porcelain, Mylar, Teflon and even air are some of the non-conductive materials used. The dielectric dictates what kind of capacitor it is and for what it is best suited. Depending on the size and type of dielectric, some capacitors are better for high frequency uses, while some are better for high voltage applications. Suntan supply a wide range of capacitors,that can meet most of customers.

• Suntan Plastic Film Capacitors --- Have a wide range ,such as HID lamp, ECU for engine control
• Suntan Ceramic capacitor --- Used for high frequency purposes like antennas, X-ray and MRI machines
• Suntan Tantalum Capacitors --- portable telephones, pagers, personal computers, and automotive electronics.
• Suntan Gold Capacitorsr --- CMOS's, microcomputers, RAM's and the like used in VCR's, tuners, TV sets, telephone sets and other.

Suntan Technology Company Limited
----All Kinds of Capacitors

There is one other common packaging for integrated circuits and this is the PGA or Pin Grid Array. The BGA looks physically similar to a Pin Grid Array package. Both are one-sided; that is, only one face of the semi-conducting substrate is used for printing and mounting of circuit components. Moreover, both have an obvious grid-like pattern. However, the Pin Grid Array uses pins - thus, the name - whereas the BGA uses balls - as it has already been mentioned above. The pins (in the PGA) or the balls (in the BGA) are the materials through which electricity is conducted between the printed surface of the semiconductor board and the surface-mounted circuit components.http://www.capacitors.hk/

Suntan Technology Company Limited
---All Kinds of Capacitors

Dielectric absorption in a capacitor is difficult to characterize accurately because of the very wide range of the time constants involved and because of the high level of performance required in the measuring equipment. To get a good characterization, the capacitor response must be measured for a range of frequencies at least three decades higher and lower than 1/τ0. Frequency domain measurements must be made with vector impedance analyzers that can accurately resolve a small resistive component in a largely reactive impedance (they must be able to accurately measure large values of Q). In the frequency domain the resistive portion of the impedance gives the most information about dielectric absorption. In the time domain, which is usually used for measurement longer than 100 ms, an ammeter is needed with very low bias current and the ability to resolve very low currents. If these instruments are available, then an accurate and complete model can be made, but such a model is often not required. To completely model dielectric absorption would require, in most cases, a range of accuracy that spans ten decades of frequency or more. Generally, however, the application does not warrant such a model and one can get by with a model that is faithful to the behavior of the physical component over a much smaller range of frequencies.

Suntan Technology Company Limited
----All Kinds of Capacitors 

When clouds drift through the sky, ice particles inside them rub against the air and gain static electrical charges—in just the same way that a balloon gets charged up when you rub it on your jumper. The top of a cloud becomes positively charged when smaller ice particles swirl upward (1); the bottom of a cloud becomes negatively charged when the heavier ice particles gather lower down (2). The separation of positive and negative charges in a cloud makes a kind of moving capacitor!

As a cloud floats along, the electric charge it contains affects things on the ground beneath it. The huge negative charge at the bottom of the cloud repels negative charge away from it, so the ground effectively becomes positively charged (3). The separation of charge between the bottom of the cloud and the ground beneath means that this area of the atmosphere is also, effectively, a capacitor.

Over time, enormous electrical charges can build up inside clouds. If the charge is really big, the cloud contains an enormous amount of electrical potential energy (it has a really high voltage). When the voltage reaches a certain level (sometimes several hundred million volts), the air is transformed from being an insulator into a conductor, and electricity will flow through it as though it were a metal wire, creating a giant spark better known as a bolt of lightning (4). The cloud behaves like a flash gun in a camera: the huge electrical energy stored in its "capacitor" is discharged in an instant and converted into a flash of light.

Suntan Technology Company Limited
----All Kinds of Capacitors

The size of a capacitor is measured in units called farads (F), named for English electrical pioneer Michael Faraday (1791–1867). One farad is a huge amount of capacitance so, in practice, most of the capacitors we come across are just fractions of a farad—typically microfarads (thousandths of a farad, written μF), nanofarads (thousand-millionths of a farad written nF), and picofarads (million millionths of a farad, written pF). Supercapacitors store far bigger charges, sometimes rated in thousands of farads.

Suntan Technology Company Limited
---All Kinds of Capacitors

Suntan hot offer Mylar capacitors, below shows you the features.

Good reputation in use with consumer & industrial electronics. 
Optimum for automatic insertion due to their small size and light weight.
Coated with epoxy resin for superior heat resistance, humidity resistance and solvent resistance.

Also Suntan is a manufacturer of Plastic Film Capacitors, Trimming Potentiometers, Capacitors, Varistors and so on. The more details you can look through the website: http://www.suntan.com.hk/
http://www.suntan.com.hk/Plastic-Film-Capacitors/Mylar-Capacitor.html

We are welcome to received your inquire and solve you problem.

Suntan Technology Company Limited
---All kinds of Capacitors

This is a measure of a capacitor's ability to store charge. A large capacitance means that more charge can be stored. Capacitance is measured in farads, symbol F. However 1F is very large, so prefixes are used to show the smaller values.

Three prefixes (multipliers) are used, µ (micro), n (nano) and p (pico):

• µ means 10-6 (millionth), so 1000000µF = 1F
• n means 10-9 (thousand-millionth), so 1000nF = 1µF
• p means 10-12 (million-millionth), so 1000pF = 1nF

Capacitor values can be very difficult to find because there are many types of capacitor with different labelling systems!

There are many types of capacitor but they can be split into two groups, polarised and unpolarised. Each group has its own circuit symbol.

Suntan Technology Company Limited
----All Kinds of Capacitors

Desalination could dramatically help the looming shortage with water. The problem is the membrane.

Right now, desalinting seawater largely revolves around pressurizing water and forcing it through a membrane to purify it. The process takes a lot of energy and hence a lot of cost. Desalinating seawater can cost as much as 50 cents a liter.

A collection of private companies and research institutes in Spain have begun to experiment with capacitive deionization for purifying seawater. In this, two electrodes would be placed in a tank. The ions (i.e., salt particles) would be drawn to one electrode. The ions would absorb the ions, which could then be released in a regeneration cycle. Capacitive purification was considered in the past, but the materials were too expensive. So who knows, it might work now.

Expect to see a number of desalination come to the fore in the next few years. Policy makers and the public love the idea and areas of Australia, Africa and China are already suffering through prolonged droughts.

Some of the more interesting ideas out there:

Porifera: A spin-out from Lawrence Livermore National Labs, the company wants to make a desalination membrane out of carbon nanotubes. The company claims it won’t take much energy to purify water in this way and the membrane can’t get fouled. Salt and other bad stuff can’t fit through the pore/openings in the nanotubes.

NanoH2O: Grew out of a research project at UCLA and so far has raised $20 million in two rounds. It has a membrane embedded with nanoparticles that repels salts and lets water pass. By exploiting chemical attraction, NanoH2O reduces the amount of mechanical-induced pressure required for reverse osmosis: The company claims it can process 70 percent more water with 20 percent less power than conventional reverse osmosis plants.

Quos: A highly secretive Chicago company founded by Chinbay Fan and funded by Khosla Ventures. One thing Quos can’t keep secret: patent applications for a system that desalinates and purifies with graphite porous electrodes.

“The apparatus is capable of removing ionized and non-ionized organic compounds, inorganic ions, particulates and bacteria from wastewater streams in a single unit to produce potable water. Porous carbon-based electrodes function as impurities filters to remove particulate matter, such as ash, sand and high molecular weight compounds, as electrodes to concentrate and remove ionic species, and as adsorbents to remove organic materials and bacteria from the wastewater stream,” says patent application 11/724534.

Stonybrook Purification: It has created a thin, fibrous scaffold for reverse osmosis membranes that increases water flow to the reverse osmosis membrane. The company, out of SUNY Stony Brook, also has its own reverse osmosis membrane.