Introduction to the working principle of DC switching power supply
DC switching power supply is used to control the switching tube through a circuit for high-speed conduction and cutoff. It provides AC power to a transformer for transformation and conversion into high-frequency DC power, thereby generating one or more sets of required voltages! The reason for converting to high-frequency AC power is that the efficiency of high-frequency AC power in transformer transformation circuits is much higher than 50HZ. Therefore, switching transformers can be made very small and not very hot during operation!! The cost is very low. If 50HZ is not converted to high frequency, then the switching power supply is meaningless
Working principle
1. The AC power input is rectified and filtered into DC;
2. Control the switching transistor through high-frequency pulse width modulation (PWM) signal and apply the DC to the primary of the switching transformer;
3. The secondary of the switching transformer induces high-frequency voltage, which is rectified and filtered to supply the load;
4. The output part is fed back to the control circuit through a certain circuit to control the PWM duty cycle, in order to achieve stable output
When inputting AC power, it is generally necessary to pass through something like an eddy current loop to filter out interference on the power grid, as well as to filter out interference from the power source on the 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;
The secondary of a switching transformer can have multiple windings or one winding can have multiple taps to obtain the desired output;
Generally, some protective circuits should be added, such as no-load and short circuit protection, otherwise it may burn out the switch power supply
Mainly used in industry and some household appliances, such as televisions, computers, etc
High frequency switch DC power supply
High frequency switching DC power supply [1] uses high-quality imported IGBT as the main power device, and ultra microcrystalline (also known as nanocrystalline) soft magnetic alloy material as the main transformer core. The main control system adopts multi ring control technology, and the structure adopts anti salt spray acidification measures. The power supply product has a reasonable structure and strong reliability. This power supply has become an updated product of thyristor power supply due to its superior performance of small size, light weight, high efficiency, and high reliability. Suitable for various precision surface treatment sites such as experiments, oxidation, electrolysis, galvanizing, nickel plating, tin plating, chrome plating, optoelectronics, smelting, chemical transformation, corrosion, etc. It has also received unanimous praise from users in areas such as anodizing, vacuum coating, electrolysis, electrophoresis, water treatment, electronic product aging, electric heating, electrochemistry, etc. Especially in the fields of PCB, electroplating, and electrolysis, it has become the preferred power product for many customers.
