In reality, most of the power adapters we come into contact with are switching power supply. Switching power supply refers to a kind of power supply that maintains stable output voltage by controlling the time ratio of switching on and off through modern electronic technology. The switching power supply of power adapter is generally composed of PULSE width modulation (PWM) control IC and MOSFET. Advantages: high conversion efficiency, small volume, and wide voltage range. Deficiency: it is difficult to repair and disturb the power circuit when the fault occurs.
Power adapter, its English name is Power Adapter, is a small portable electronic equipment and electronic appliances Power supply Power conversion equipment, generally by the shell, Power transformer and rectifier circuit, according to its output type can be divided into AC output type and DC output type; According to the connection mode can be divided into wall type and desktop type. It is widely used in telephone machine, game machine, language repeater, Walkman, notebook computer, cellular telephone and other devices. Power adapter, its English name is Power adapter, is mainly used for small electronic equipment and electronic appliances Power supply Power conversion equipment, generally by the shell, Power transformer and rectifier circuit.
The 220V AC is converted to a low-voltage AC by a lowering transformer. 2. Using four diodes, the unidirectional conductivity of the diodes is used to convert alternating current into direct current (the size is variable). 3, use capacitance filter to change the size of the dc into a constant DC.
There are two types of power adapters:
1, a simple transformer, some have a certain voltage stabilizing function, output is the exchange. This kind of appliance has rectifier circuits inside.
2, voltage regulator plus rectification, the output is dc. Such an appliance has no rectifier circuit. Never use the adapter in 1. As for the principle, there are no more than transformers and switching power supply. Of course, there are also capacitor voltage classes of ultra-cheap.
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Post time: Sep-04-2020