Workflow of adjustable switching power supply
Power supply→input filter→full bridge rectification→DC filter→switching tube (oscillating inverter)→switching transformer→output rectification and filtering.
details
1. Adapt to the needs of production development
The original power supply can be used, and on this basis, the number of modules can be flexibly increased or decreased, the current can be increased or decreased, and the utilization rate of the equipment can be improved.
2. Improve the reliability of production operation
The power supply design adopts the N+1 mode. Under normal circumstances, all modules participate in the work. If the equipment fails, the power supply will not stop. The system will automatically reduce the current operation and exit the faulty unit without affecting production.
3. Easy maintenance
All modular units are common, only need to back up a few modular units to freely replace faulty modules, making maintenance relatively simple.
4. Digital control
Each module unit uses a microprocessor as the control core, and mainly uses software programs to realize automatic current equalization and other control schemes. It has flexible control, high precision, fast dynamic response, few components used, and high reliability.
5. The entire power supply system adopts an intelligent main line structure to realize module hot swapping, current sharing control\fault detection\fault information display functions, and the user interface is intuitive and friendly.
Common Mode Interference and Differential Mode Interference
There are two types of interference on the power line: common mode interference and differential mode interference. Common mode interference exists between any relative ground of the power supply or between wires and ground. Common mode interference is also sometimes called longitudinal mode interference, asymmetrical interference or ground interference. This is the interference between the current carrying conductor and the earth. Differential mode interference exists between the phase line and the neutral line of the power supply and between the phase line and the phase line. Differential mode interference is also called normal mode interference, transverse mode interference or symmetrical interference. This is interference between current carrying conductors. Common mode interference indicates that the interference is coupled into the circuit by radiation or crosstalk, while differential mode interference indicates that the interference originates from the same power circuit. Usually these two kinds of interference exist at the same time. Due to the imbalance of line impedance, the two kinds of interference will be transformed into each other during transmission, so the situation is very complicated. After the interference is transmitted over a long distance, the attenuation of the differential mode component is greater than that of the common mode, because the line-to-line impedance is different from the line-to-ground impedance. For the same reason, common mode interference will also radiate to adjacent spaces during line transmission, but differential mode will not, so common mode interference is more likely to cause electromagnetic interference than differential mode. Different interference methods require different interference suppression methods to be effective. An easy way to determine the method of interference is to use a current probe. The current probe loops around each wire individually to get the inductance of a single wire, and then loops around two wires (one of which is ground) to detect the inductance. If the induction value increases, the interference current in the line is common mode; otherwise, it is differential mode.
