Working principle of the DC switch mode power supply
DC switching power supply is used to control the switching tube through the circuit for high-speed conduction and cut-off. The alternating current will be provided to the transformer to transform into high-frequency direct current, thereby generating the required one or more voltage! Converted to high-frequency alternating current is the reason that high-frequency alternating current in the transformer converter circuit is much more efficient than 50HZ. So the switching transformer can be made very small, and work is not very hot! The cost is very low. If you do not change the 50HZ into high-frequency switching power supply is meaningless!
Principle of operation
1. AC power input rectified and filtered into DC.
2. Through the high-frequency pWM (pulse width modulation) signal control switching tube, the DC added to the switching transformer on the primary.
3. The secondary switching transformer induces a high-frequency voltage, which is rectified and filtered and supplied to the load.
4. The output part is fed back to the control circuit through certain circuits to control the pWM duty cycle to achieve the purpose of stable output.
AC power input generally through the current loop things like, filter out the interference on the grid, but also filter out the power supply on the grid interference.
In the same power, the higher the switching frequency, the smaller the size of the switching transformer, but the higher the requirements of the switching tube.
The secondary of the switching transformer can have more than one winding or one winding with more than one tap, in order to get the required output.
Generally, some protection circuits should be added, such as no-load and short-circuit protection, otherwise the switching power supply may be burned.
Mainly used in industry and some household appliances, such as television sets, computers, etc.
High frequency switching DC power supply
High-frequency switching DC power supply [1] is a high-quality imported IGBT as the main power device, with ultra-microcrystalline (also known as nanocrystalline) soft magnetic alloy materials for the main transformer core, the main control system adopts a multi-loop control technology, the structure of the anti-salt spray acidification measures taken. The structure of the power supply is reasonable and reliable. The power supply with its small size, light weight, high efficiency, high reliability of the superior performance of the silicon controlled power supply to become a new generation of products. It is suitable for experiment, oxidation, electrolysis, zinc plating, nickel plating, tin plating, chromium plating, photoelectricity, smelting, chemical formation, corrosion and other precision surface treatment places. In the anodic oxidation, vacuum coating, electrolysis, electrophoresis, water treatment, aging of electronic products, electric heating, electrochemistry, etc. also get users consistent high praise. Especially in the field of pCB, electroplating, electrolysis industry, has become the first choice of many customers power supply products.
