How to change the power frequency transformer into a switching power supply?
The generally understood switching power supply is a power supply controlled by a high-frequency switch. It has the same basic principle as a power frequency transformer, but all operating frequencies are different.
Difference between industrial frequency transformer and switching power supply:
Power frequency transformer is the transformer working at power frequency 50Hz. Its structure is relatively simple, two windings, primary winding and secondary winding form a magnetic path through silicon steel sheet. After the primary winding is energized, the magnetic field is transmitted to the secondary through the silicon steel sheet, and then the secondary induces a voltage.
Due to the relationship between the power frequency transformer frequency and the magnetically conductive material, when the power is relatively large, the volume will be relatively large, and the working efficiency is relatively low. The appearance of the switching power supply has ended the problems of the volume and cost of the high-power transformer. The basic working principle of the switching power supply is the same as the power frequency transformer, the difference is that the power frequency transformer is directly input by the AC voltage, and because the switching power supply works at a high frequency, a part of the circuit needs to convert the input power frequency voltage It is a high-frequency voltage.
The above figure is a relatively simple switching power supply circuit. Its basic working process is: after the AC voltage is input, it is rectified and filtered to become DC, and then the triode V1 and peripheral components form a self-excited oscillation circuit to convert the DC voltage into high-frequency pulses. Direct current is input to the primary winding of the transformer. The voltage induced by the secondary winding is output after being rectified and filtered. The output voltage adjustment control part is composed of the transistor V2 and peripheral components, and the output voltage is controlled by detecting the voltage of the auxiliary winding of the transformer.
The switching power supply solves the problems of large size and high cost of the power frequency transformer, and the output of the switching power supply adds voltage feedback, which can work at a relatively wide input voltage, while keeping the output constant. The power frequency transformer has a secondary output due to the output voltage and the primary winding. The turns ratio of the stage winding is related. When the input voltage fluctuates greatly, the output fluctuation will also be relatively large. However, because the switching power supply works at a power frequency, high-frequency signals will cause interference to some circuits, and some circuits are not suitable for using switching power supplies.
How to change the power frequency transformer into a switching power supply:
It can be known from the working principle of the above switching power supply that the switching power supply works at high frequency, both the number of turns voltage relationship and the magnetically conductive material are different from the power frequency transformer, so the transformer given by the questioner is It cannot be changed to a traditional switching power supply. According to the understanding of conventional applications, power frequency transformers can be changed to inverters. The role of the inverter is to increase the voltage of direct current (battery-powered) and convert it to alternating current output for use in household appliances.
The above picture is a relatively simple circuit diagram using an industrial frequency transformer to make an inverter. The circuit consists of a triode and a RC element on the left to form a self-excited oscillation circuit. The MOS is driven to generate a pulsed DC voltage, and 220V AC voltage is output through the transformer boost. Because the power frequency transformer is used, the working frequency is 50Hz, and the transformer needs to use a dual power output transformer. From the color of the picture that the questioner should give out, this transformer should have multiple sets of dual power outputs. Specifically, it is necessary to determine whether the output voltage is appropriate before the inverter can be modified.
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