Maintenance problems and techniques of excitation mode of switching power supply

About the classification of switching power supply, principle, specific details have been introduced for you, in these categories, there is a classification method is divided according to the excitation of the power supply, about the excitation power supply, can be said to be an accessory of the switching power supply, there are some special requirements of the switching power supply need excitation power to assist to complete its special function, The following is a specific introduction to this kind of excitation power source:

Excitation mode definition of switching power supply:

Led switching power supply manufacturer excitation power is actually meet to the working conditions of a certain electronic components and additional power.

For example, when measuring humidity, the humidity resistor needs to work in a certain AC or DC state. The AC and DC power supply provided for the humidity sensor is the excitation power supply. This power supply requires low power but good stability and high precision.

For example, kitchen range hoods have sensors to detect gas leaks, which also need to add a stable DC voltage to work, and so on.

The circuit composition of the excitation power supply.

Basic composition of self-excited circuit:

The essence of self-excited circuit is a switching power supply manufacturer single-tube self-excited oscillation circuit, adding pulse width control circuit and voltage regulator sampling circuit becomes the most basic switching power supply, of course, the actual circuit also needs to add the necessary overvoltage and overvoltage protection, self-excited oscillation circuit adjustment method in addition to pulse width adjustment, there is another way - frequency modulation, frequency modulation circuit is more complex, has been outdated, basically not used.

Switching power supply damage problems for many reasons, as long as the contact or use of switching power users know some of its basic problems, some because of lack of experience or switching power supply this product does not understand the waterproof power supply, causing some small problems on a switching power product thrown away, which is a great waste of resources, It is suggested that users with less switching power supply can collect these damaged products to wait for the manufacturer to recover, some short demand users can buy materials and tools in order to timely maintenance and processing of the switching power supply, the following to continue to introduce some problems and solutions of the switching power supply.

Basic steps to repair and check the problem of switching power supply:

If conditions such as the side of the tool, you can first check in the Shenzhen switching power supply in the state of no obvious short circuit, component damage.

1. First, open the shell of the power supply and check whether the fuse is blown.

2. Observe the internal situation of the power supply again. If the components on the PCB board of the power supply are found to be broken, the components should be checked emphatically.

3. Smell whether there is mushy smell inside the power supply, check whether there are burnt components, ask about the damage to the power supply, and whether there are illegal operations on the power supply, which is necessary for  repairing any equipment.