Capacitors Blog

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----All Kinds of Capacitors

(1)Because the solid tantalum capacitor is of polar type, do not apply a reverse voltage to it.

(2)The figure on the below shows the relationship between current and reverse voltage.

Suntan Technology Company Limited
---All Kinds of Capacitors

Effect of Frequency: Frequency affects both capacitance and dissipation factor..

The variation of impedance with frequency is an important consideration in the application of multilayer ceramic capacitors. Total impedance of the capacitor is the vector of the capacitive reactance, the inductive reactance, and the ESR. As frequency increases, the capacitive reactance decreases. However, the series inductance (L)  produces inductive reactance, which increases with frequency. At some frequency, the impedance ceases to be capacitive and becomes inductive. This point, at the bottom of the V-shaped impedance versus frequency curves, is the self-resonant frequency. At the self-resonant frequency, the reactance is zero, and the impedance consists of the ESR only.

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---All Kinds of Capacitors

Of much less concern, yet still important, especially in audio applications, is the micro phonic or piezoelectric effect. Barium titinate which is the base ceramic material for most dielectric systems will exhibit microphonic effects. It is not very difficult to take a Y5V capacitor and put a DC bias with a small signal 1kHz sine wave and get the capacitor to “sing”. Tantalum capacitors exhibit no microphonic effects. The experiment done by AVX involved the opposite phenomena whereby the part was shaken while under bias and the resulting generated voltage was measured. This was done for a series of 1µF devices and the results are shown in Fig below.

Suntan Technology Company Limited
---All Kinds of Capacitors

Suntan lead the unique and latest technology in manufacturing ceramic trimmer. We specialized in producing ceramic trimmer capacitors with 3mm-SMD Ceramic Trimmer Capacitor, 3mm-Special SMD Ceramic Trimmer Capacitor, 5mm Trimmer Ceramic Capacitor, 6mm and 7mm Ceramic Trimmer Capacitor etc. Following is the applications of a Ceramic Trimmer Capavcitor

Consumer Electronic Equipment
Audio & Visual Equipment -- Home VTR/VCR, VTR Camera, Television set, Video-disk Player, Digital Equipment, Radio Cassette Recorder, Hi-Fi Audio Equipment, Car Audio Equipment, Broadcast Equipment, CATV.

Industrial Electronic Equipment
Tele-communication Equipment -- Facsimile, Key Phone, Electronic telephone, electronic exchanger.
Radio Communication Equipment -- Automobile Telephone, Pocket Pager, Personal Radio.
CPU & Peripherals -- FDD, Computer, Printer, CRT Display.
Office equipment -- Word Processor.
Testing & Measuring Instruments -- Electronic Measuring Instruments, Industrial Measuring Equipment, Medical Electronics Equipment.
Factory Automation Equipment -- Numerical Control Machine, Industrial Robotics, Automatic Equipment, Ultrasonic Equipment, Components for High-frequency Circuit.

Home Appliances / Home Security Devices
Others -- Toys and Electronics Games.

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

Suntan the best sell Polypropylene Film Capacitor is Metallized Polypropylene Film Capacitor - X2 - TS08S. For TS08S Capacitor, It Provides interference suppression with CE & TUV and UL safety approvals. And TS08S also have High dv/ dt capabilities.TS08S Capacitor is widely used in the electrical Industry. Suntan St mark TS08S Capacitor is popular in the oversea market.

Polypropylene Film Capacitor is used in such devices as pulse-handle circuits, stable oscillators and sample-and-hold circuits. Due to a balanced profile of a higher dielectric strength than polycarbonate, strong insulation and low moisture absorption, this film capacitor is one of the most frequently used. This capacitor can also be combined with foil, metalized film or others, depending on the need. Self-healing is also available in this capacitor. If an over-voltage occurs, however, polypropylene has a tendency to be damaged.

Suntan Technology Company Limited
---All Kinds of Capacitors

This is an effective resistance that is used to describe the resistive parts of the impedance of certain electronic components. The theoretical treatment of devices such as capacitors and inductors tends to assume they are ideal or "perfect" devices, contributing only capacitance or inductance to the circuit. However, all (non-superconducting) physical devices are constructed of materials with nonzero electrical resistance, which means that all real-world components contain some resistance in addition to their other properties. A low ESR capacitor typically has an ESR of 0.01 Ω. Low values are preferred for high-current, pulse applications. Low ESR capacitors have the capability to deliver huge currents into short circuits, which can be dangerous.

For capacitors, ESR takes into account the internal lead and plate resistances and other factors. An easy way to deal with these inherent resistances in circuit analysis is to express each real capacitor as a combination of an ideal component and a small resistor in series, the resistor having a value equal to the resistance of the physical device.

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

A super capacitor is also known as a double-layer capacitor. It polarizes an electrolytic solution to store energy electro statically. Though it is an electrochemical device, no chemical reactions are involved in its energy storage mechanism. This mechanism is highly reversible, and allows the ultra capacitor to be charged and discharged hundreds of thousands of times.

A super capacitor can be viewed as two non reactive porous plates, or collectors, suspended within an electrolyte, with a voltage potential applied across the collectors. In an individual super capacitor cell, the applied potential on the positive electrode attracts the negative ions in the electrolyte, while the potential on the negative electrode attracts the positive ions. A dielectric separator between the two electrodes prevents the charge from moving between the two electrodes.

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

Variable capacitors are mostly used in radio tuning circuits and they are sometimes called 'tuning capacitors'. They have very small capacitance values, typically between 100pF and 500pF (100pF = 0.0001µF). The type illustrated usually has trimmers built in as well as the main variable capacitor.

Many variable capacitors have very short spindles which are not suitable for the standard knobs used for variable resistors and rotary switches. It would be wise to check that a suitable knob is available before ordering a variable capacitor.

Variable capacitors are not normally used in timing circuits because their capacitance is too small to be practical and the range of values available is very limited. Instead timing circuits use a fixed capacitor and a variable resistor if it is necessary to vary the time period.

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

Charging and discharging occurs by the absorption and release reaction of ions in the electric double-layer which is formed between the electrode layer and the electrolyte layer. Gold Capacitors are also called Electric Double Layer Capacitors.

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----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.