Dongguan Yinyin Hardware Products Co., Ltd. specializes in producing silver contacts, relay contacts, silver alloy contacts, in-mold riveting contact points, punching and riveting integrated contact composite contacts, shaped contacts, solder contacts, environmentally friendly contacts, Switch contacts, rivet contacts, riveting contacts.
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Switching power supply is to use the circuit control switch tube for high-speed pass and cut. Converting direct current to high frequency alternating current is provided to the transformer for voltage transformation to produce one or more sets of voltages required. The reason for switching to high-frequency AC is that the efficiency of high-frequency AC in the transformer transformer circuit is much higher than that of 50HZ. Therefore, the switching transformer can be made very small and not very hot during operation. The cost is very low. If you do not turn 50HZ into a high frequency, then there is no point in switching the power supply. Switching transformers are also not mysterious. It is an ordinary transformer. This is the switching power supply. The switching power supply can be roughly divided into two types: isolated and non-isolated. The isolated type must have a switching transformer, but not necessarily isolated. Simply put, the working principle of a switching power supply is:
1. The AC power input is rectified and filtered into DC;
2. Control the switching tube by high frequency PWM (pulse width modulation) signal, and add that DC to the primary of the switching transformer;
3. The secondary of the switching transformer induces a high-frequency voltage, which is supplied to the load through rectification and filtering;
4. The output part is fed back to the control circuit through a certain circuit to control the PWM duty cycle to achieve the purpose of stable output.
When the AC power input is input, it generally passes through something like the E-flow circle to filter out the interference on the power grid and also filter out the interference of the power supply to the power grid;
When the power is the same, the higher the switching frequency, the smaller the volume of the switching transformer, but the higher the requirements for the switching tube;
switch
The secondary of the transformer may have multiple windings or one winding with multiple taps to obtain the desired output;
Generally, some protection circuits should be added, such as no-load, short-circuit, etc., otherwise the switching power supply may be burnt.
The above is the general working principle of the switching power supply.
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