How to use switching power supply and guide power supply correctly?

I believe that most people for the switching power supply and guide power supply is just a simple understanding, will use it. How to use switching power supply and guide power supply correctly? Let's take a look today!

1. The specifications of AC voltage used by the guide power supply include 110VAC, 220VAC and 380VAC power supply. Before powering on the power supply, check whether the connected voltage is consistent with the power input voltage.

2, do not connect the load before the initial power-on, first check whether the output voltage of the power supply is consistent with the power supply of the connected equipment, so as to avoid damage to the connected equipment.

3. The ground wire should be connected before the power supply is used. The ground wire of the power supply should be marked in the figure.

4, the use of power should be placed in the center of good ventilation.

5. The output current of guide power supply is definite; Measure the uniform current value according to the rated standard current of the equipment supplied by the guide power supply or the multimeter. When the ambient temperature is high, the air activity is not good, and the rational load condition, prepare 20-30% more current margin.

6. The power input of guide rail power supply is determined: the power input of guide rail power supply depends on the rated power of the supplied equipment. In the condition of not knowing the rated power of the supplied equipment, according to the product value of rated current and voltage of the supplied equipment, we can get (current X voltage = power). When the user chooses the power of the power supply, it should be more than 15-30% of the practical power and the peak power.

7. The number of direct current output channels of guide power supply is determined: guide power supply generally has a maximum of four outputs. (S- single group, D- double group, T- three group, Q- four group) according to the equipment provided.

8, guide power supply has over/under voltage, over current, overheating maintenance and fan heat dissipation and other maintenance functions. Please stop the selection according to the practical application status, in order to strengthen the stability and reliability of the system engineering.

9. Guide power supply varieties are: industrial iron shell type, guide rail type, LED outdoor rain proof and waterproof type, please choose according to practical application.

In the design of circuit system, the criterion of "one point grounding" should be followed. If multi-point grounding is formed, it will present a closed grounding loop, and magnetic induction noise will be generated when the magnetic force line passes through the loop. In practice, it is difficult to complete "one point grounding". Therefore, in order to reduce the grounding impedance and eliminate the influence of the scattered capacitance, plane or multi-point grounding is adopted. A conductive plane (conductive plane layer of the bottom plate or multilayer printed board circuit, etc.) is used as a reference ground, and the local grounding is connected to the reference ground nearby. To further reduce the voltage drop in the grounding loop, a bypass capacitor can be used to reduce the amplitude of the return current. In a low frequency and high frequency circuit system, connect the ground cables of the low frequency circuit, high frequency circuit, and power circuit separately, and then connect them to the common reference point.