What are the common problems of switching power supply circuit? What do I need to pay attention to when buying mesh switching power supply?

Switching power supply circuit FAQ

1, safety certification requirements: transformer drawings, PCB, schematic diagram of the transformer fly line position number needs to be the same, this common sense often makes mistakes when submitting certification.

2, UL62368, CCC certification requirements: in the certification interrupt open a group of resistors and then test the residual voltage of X capacitor, so X capacitor discharge resistance needs to put two groups, generally such a mistake can only be changed PCB Layout.

3, in order to avoid assembly difficulties and over furnace air welding and other problems, the transformer in the fly line PCB aperture to reserve the maximum fly line diameter, can also reserve a large and small PCB hole, safety certification, low voltage high current, high voltage low current fly line diameter is not the same.

4, as mentioned above, PCB aperture generally needs to reserve the maximum aperture, no matter in DC wire or other wire, generally high voltage low current and low voltage high current wire is different, reserving the maximum aperture will not encounter difficulties in assembly.

5. Because when multiple OCP current-limiting resistors are connected in parallel, the smaller the resistance value is, the greater the power the resistance will bear. Therefore, the resistance value should be designed the same when designing

What do I need to pay attention to when buying mesh switching power supply?

1, in the choice of mesh power supply to consider the range of voltage and current.

Because these two are relatively easy to determine the indicators, as long as the circuit power consumption calculation can be. But also consider testing high and low supply voltage extremes. General mesh power supply allows the output voltage to vary in the range of plus or minus 10%, if still cannot meet the requirements of the circuit need to choose the output adjustable or choose to allow a wider range of mesh power supply. If a grid power supply is used to power a combined unit, 75% to 90% of the maximum power required by the unit should be supplied by a grid power supply. If not, you can connect two mesh power supplies or more mesh power supplies.

2. When choosing mesh power supply, we should consider the scalability and security of mesh power supply.

Because both of these are relatively important. The first is to work in parallel or in series, that is, when a network power supply cannot meet the required voltage or current range, two or three network power supplies can be used in parallel or in series. In this mode, the connection between the voltage regulator and the control circuit between the network power modules still exists, but a network power supply as the main control side. Another mesh power source acts as the controlled party.

3, is the network power overload protection.

Because a mesh power supply needs to be used by different circuits, and we do not know the flow of these circuits, so in order to avoid damage to the mesh power supply, we need to set the range of protection circuits. Because all power supplies have to maintain the maximum output value beyond the output range, and is to shut down the mesh power supply, some control power supply in addition to the program output range, but also can automatically set the stable output type of the power supply, that is to say when the circuit needs voltage or current exceeds the set limit, the mesh power supply can automatically become a constant voltage source. In addition, protective diodes can be added to the mesh power supply to prevent the loss caused by misconnection of the polarity of the external mesh power supply. The thermal sensor can also be used to prevent the mesh power supply from burning out because the mesh power supply continues to work in the overload state or is ineffective in cooling.

4, the potential cause of damage inside the network power supply, is pulsation and noise.

Since the ideal DC voltage should provide pure DC, however, there will always be some interference such as pulsating current and high frequency oscillation superimposed on the output port of the switching power supply, so these two interference combined with the noise generated by the mesh power supply itself will cause the mesh power supply to drift intermittently and randomly.

The above is the FAQ of the switching power circuit and what to pay attention to the purchase of mesh switching power supply, if you have any questions can contact us, we will believe that the answer for you!