【 Weak current College 】 eight kinds of capacitor structure and features of 】

Capacitor is commonly used in electronic devices, the following components on a few common characteristics of capacitor structure and make a brief presentation for your reference.

1 Electrolytic Capacitor Technology ' > Aluminum Electrolytic Capacitor technical ' > Aluminum Electrolytic Capacitor: it is made of aluminum tubes do negative, it is equipped with liquid electrolyte, insert a piece of curved aluminium strip do cathode. Also dealt with by the DC voltage, positive slice forming a layer of oxide film do the media. It features a large capacity, but the leakage of large, poor stability, have positive and negative polarity, suitable for power supply filtering or low-frequency circuit, use when, negative not connected reversely.

2-niobium capacitors with metal tantalum, niobium do cathode or with dilute sulfuric acid, etc. with fluid do negative, tantalum or niobium surface generated oxidation film do media. Its characteristics are: small size, capacity, performance, stability, long life. Insulation resistance. Temperature performance is good, with more sophisticated equipment.

3 ceramic capacitors: ceramic do media. In ceramic substrate surface sprayed silver layer, and then firing a plate silver film. Its characteristics are: small size, good heat resistance, the loss of small, high insulation resistance, but smaller, suitable for high frequency circuit. Ferroelectric ceramic capacitor capacity is large, but losses and higher temperature coefficient applicable to low-frequency circuit.

4 MICA capacitors: with a metal foil or in the MICA on sprayed silver layer electrode plate, plate making and Mica layers stacked and then die in bakelite powder or sealed in epoxy resin. Its characteristics are: medium loss is small, the insulation resistance. Temperature coefficient applicable to high frequency circuit.

5 film capacitor technology ' > film capacitors: same as in paper capacitor structure, media is a polyester or polystyrene. Polyester film capacitors, high dielectric constant, small volume, large capacity, stability is better suited to bypass capacitor. Polystyrene film capacitors, dielectric loss of small, high insulation resistance, temperature coefficient, and can be used for high frequency circuit.

6 paper capacitor: two pieces of metal foil electrodes, made in very thin capacitor paper, rolls into cylindrical or flat cylindrical core, then sealed in a metal case or material technologies ' > insulation shell. It is characterized by smaller, capacity can be larger. But the inherent inductance and loss is relatively large, suitable for low-frequency circuit.

7 metalized capacitor: structure is basically the same on paper capacitor, it is in the capacitor paper coated with a layer of metal film to generations of metal foil, small, larger in capacity, typically used for low-frequency circuit.

8 oil-impregnated paper capacitor: it is the paper capacitor in a specially treated oil, can enhance their pressure. Its characteristics are electric capacity, pressure is high, but the relatively large size. Moreover, in practice, the first to be based on different uses select different types of capacitors; the second the capacitor of nominal capacity, tolerance, withstand voltage, leakage resistance and other technical parameters; the third for the positive and negative electrode of electrolytic capacitors, positive and negative electrode welding is not reversed.