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Switch transformer and switch three.

We are most familiar with the transformer, on, is when we remove the magnet wire wrapped around a large lump iron. The high school physics in has studied its principle. In the power supply transformer is of course, high voltage into low voltage, for PC to use. High school physics tells us: according to the theory of electromagnetism, the conversion ratio of the transformer is mainly composed of coil turns, so the larger the switch type transformer can transfer more energy, but also distinguish quality or poor power supply one of point of observation, to some extent, the head of a direct impact on power transformer the real power output and quality.

The three transistor switch UPS power supply hub, it is mainly responsible for the converted DC high voltage fed to the switch transformer step-down voltage level, which shall not be less than 800V, the output current is usually not less than 5A. The three transistor switch belongs to the core of damageable parts, it is the core part of the switch power supply, so the three transistor of the quality and the power supply itself quality is closely related to the.

Protection circuit

The internal power supply protection circuit monitors the power of every act and every move, is the power of the brain. It is responsible for starting power source and the voltage / current monitoring and adjustment, at the same time in the event of a short circuit, circuit, overvoltage, overcurrent, under-voltage, under current situation of automatic protection. Inferior power often simplify this part of the circuit and did not even set protection circuit, two all this will give PC system brings a lot of trouble.

According to the location and monitoring protection circuit of different types, the internal power supply protective circuit is divided into input over voltage protection, over current protection, input output overvoltage protection and output over-current protection of a four type, the most high-quality brand power propaganda " four protection circuit". As the name implies, an overvoltage / overcurrent protection circuit is also monitoring the input / output voltage / current abnormal automatically, to protect.

In addition to high quality power supply usually is also provided with output short circuit protection. This is a very practical function.

PFC circuit

At the recent national compulsory3C certification, requirements of internal power supply must increase a power factor correction circuit, to reduce the switching power supply for external power grid interference, which is now the internal power supply circuit for PFC. So the new CCC through the national certification of the internal power supply will appear a new member, PFC circuit. By means of the logarithm ten power disassembling, can discover the common PFC circuit is a passive inductance, its cost was about 5-6yuan, than the head switch transformer and large, looking like a switch transformer, with yellow tape package. There are some space for the pursuit of compact product or the pursuit of performance of power products will use cost in the 20-30element of the PFC active components, small size and power factor can be close to one, the effect is very good.