how to select the capacitor in the power adapter

Power adapter manufacturer: how to select the capacitor in the power adapter

Eahunt has 15 years of experience in power supply research and development and production, the existing R & D team of more than 200 people, the monthly production capacity of more than 3 million, is currently one of the major power supply manufacturers in China, the company produces a variety of specifications and certified power supply products, including: small household appliances chargers, balance car chargers, electric car chargers, mining machine power supply, USB chargers and so on.

Capacitor is a switching power supply is no more than ordinary devices, it can be used to reduce ripple noise, can be used to improve the stability of the power supply as well as transient response, however, there are many types of capacitors, how to quickly through the skills of selection, while the product reliability and high performance and stability?

First of all, let's take a general understanding of the types of capacitors. More types of capacitors, according to the package has a chip capacitor, plug-in capacitor, according to the medium of ceramic capacitors, tantalum capacitors, electrolytic capacitors, mica capacitors, film capacitors, etc., according to the structure of the situation, there are fixed capacitors, semi-fixed capacitors, variable capacitors. In the switching power supply, we use the most is ceramic capacitors, electrolytic capacitors and tantalum capacitors. Among them

1. Ceramic capacitors have smaller capacitance, good high frequency characteristics, wider operating temperature range, smaller ESR than electrolytic capacitors, small size, no polarity;

2. Electrolytic capacitor capacitance can be made larger, but the operating temperature range is narrower, ESR is larger, have polarity;

3. Tantalum capacitors ESR is the smallest, the capacitance can be larger than ceramic capacitors, polarity, poor safety performance, easy to fire.

Solve the characteristics of the above three capacitors, in the use of them can be easily.

In addition, the use of capacitors is also divided into the internal environment and the external environment of the circuit, the internal environment of the circuit, including frequency, voltage, current, capacitance in the circuit of the main role, etc.; according to the circuit frequency can determine the type of capacitance; according to the voltage value can determine the selection of capacitance of the voltage withstand value; in the circuit can be used to refer to the main role in the selection of capacitance of the capacitance of the capacitance of the value, etc.; according to the circuit of external use of capacitance environment for Selection of capacitors according to the external environment of the circuit, product operating temperature, safety requirements, etc., can be used to narrow the range of capacitor selection. Improper selection of capacitors will result in bursting and drying of the electrolyte in the application, which will ultimately lead to the failure of the power supply.

Eahunt in the power supply industry has always been adhering to the quality first, reputation first philosophy, all the production of power supply products are subject to strict quality control and safety checks to ensure product quality, Flying Eagle power supply, military quality, trustworthy.

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