Classification of DC Switching Power Supplies
operational principle
1. The AC power input is rectified and filtered into DC;
2. Control the switch tube through high-frequency pWM (pulse width modulation) signal, and apply that DC to the primary of the switch transformer;
3. The secondary induction of the switch transformer produces 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, in order to achieve stable output
When inputting AC power, it usually passes through something like an eddy current loop to filter out interference on the power grid and also to filter out interference from the power source on 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 requirement for the switching transistor;
The secondary of a switching transformer can have multiple windings or one winding with multiple taps to obtain the required output;
Generally, some protective circuits should also be added, such as no-load and short circuit protection, otherwise it may burn out the switching power supply
Mainly used in industry and some household appliances, such as televisions, computers, etc
Classification of DC Switching Power Supplies
The high-frequency switching DC power supply [1] is made of high-quality imported IGBT as the main power device, and the transformer core is mainly made of ultra microcrystalline (also known as nanocrystalline) soft magnetic alloy material. The main control system adopts multi loop 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 places such as experiments, oxidation, electrolysis, galvanizing, nickel plating, tin plating, chromium plating, optoelectronics, smelting, formation, 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 supply product for many customers.
Application characteristics
1. Reduce porosity, and the formation rate of crystal nuclei is faster than the growth rate, promoting the refinement of crystal nuclei.
2. Improving the bonding force, causing the passivation film to break down, is conducive to a solid bonding between the substrate and the coating.
3. Improving coverage and dispersion capabilities, high cathode negative potential allows passive areas in ordinary electroplating to deposit, slowing down the defects of "burnt" and "dendritic" deposits caused by excessive consumption of deposition ions in protruding parts with complex shapes. For obtaining a given characteristic coating (such as color, no pores, etc.), the thickness can be reduced to 1/3-1/2 of the original, saving raw materials.
4. Reduce the internal stress of the coating, improve lattice defects, impurities, voids, tumors, etc., easily obtain a crack free coating, and reduce additives.
5. It is beneficial to obtain alloy coatings with stable composition.
6. Improve the dissolution of the anode without the need for an anode activator.
7. Improving the mechanical and physical properties of the coating, such as increasing density to reduce surface and body resistance, improving toughness, wear resistance, corrosion resistance, and controlling the hardness of the coating.
