Adapter 12v 2a Power Supply Adapter

Power adapter resistance and electrolytic capacitor failure rule summary

Power adapter capacitors and resistors are very common components, also plays a very important role, but they will also appear in the daily use of wear and tear, especially electrolytic capacitors in the use of the failure rate is higher.Eahunt power adapter according to their own many years of research and development experience in the production of power adapters, to summarize some of the resistors and electrolytic capacitors failure law. I hope to be able to help some friends.

Power adapter resistance damage to the most open-circuit, resistance value becomes large less common, resistance value becomes small very rare. There are several types of carbon film resistors, metal film resistors, wirewound resistors and insurance resistors. The first two types of resistors are the most widely used, the damage is characterized by a low resistance (100Ω or less) and high resistance (100kΩ) of the damage rate is higher, resistance (such as hundreds of ohms to dozens of kilo-ohms) of the damage is rare; two is low resistance resistance damage is often burnt black, very found, and high resistance resistance damage is seldom traces. Wirewound resistors are used as current limiters for large currents and have a small resistance value.

Cylindrical wirewound resistors will be blackened or have cracks on the surface when burned, while some have no traces. Cement resistors are a kind of wirewound resistors, which will break when burned out, otherwise there is no visible trace. Some will blow off a piece of skin on the surface when the safety resistor burns out, and some have no traces, but will never be burnt black. According to the characteristics, you can focus on when checking the resistor, and quickly find the damaged resistor.

Power adapter electrolytic capacitor damage has the following manifestations: First, the loss of capacity or capacity to become smaller; Second, a slight or serious leakage; Third, the loss of capacity or capacity to become smaller with leakage. Find the damaged electrolytic capacitor methods:

Some capacitors will leak when damaged, capacitance below the surface of the circuit board and even capacitance appearance will have a layer of oil stains, this capacitor absolutely can not be used again; (2) some serious leakage of electrolytic capacitors will be hot, touching with a finger or even scalding, this capacitor replacement; electrolytic capacitors inside the electrolytic liquid, long time baking will make the electrolyte dry, resulting in a reduction in capacitance, we should focus on checking the heatsink and the high-power components! Nearby capacitors, the closer it is, the greater the damage.

Eahunt in the production of power adapters, in order to ensure the quality and safety of the product, in the use of raw materials, including capacitors, resistors are selected from the best quality components. Therefore, the products have good durability and life span.

EAHUNT power adapter manufacturer adheres to the principle of quality first, each power supply product will undergo 100% aging test, 3 times function detection test, to ensure that the factory pass rate of 100%. Product life can reach 100,000 hours, to meet the 10,000 times plugging and unplugging without failure standard, military quality, trustworthy.