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About input anti-jamming performance of switching power supply (SMPS), because of the characteristics of its own circuit (Tandem), the general input disturbance, such as surge voltage is difficult to pass, the output voltage stability index of this technology compared with the linear power have greater advantages, and its output voltage up to (0.5 ~ 1)%. Switching power supply module (SMPS) as an integrated power electronic devices, in the selection should note the following:
The choice of output current
Due to high efficiency of switching power supply, generally 80% or more, so their choice of output current should be accurately measured or calculated the maximum absorption current of electrical equipment, in order to the switching power supply which is selected can be with high performance and low cost, Usually computational formula of output is :
Is = KIf
Where: Is-switching power supply rated output current;
If-electrical equipment, the maximum absorption current;
K-factor margin, generally of 1.5 to 1.8;
Ground
Switching power supply linear power supply will produce more than the interference, common mode interference on sensitive electrical equipment, grounding and shielding measures should be taken by ICE1000. EN61000. EMC FCC and other limitations, shaped switching power supply electromagnetic compatibility EMC measures are taken, so switching power supply should normally be with EMC EMC filter. Hua Fu techniques, such as HA Lead Series switching power supply, its FG terminals to chassis ground or take the user in order to meet the electromagnetic compatibility requirements.
Protection circuit
In the design of switching power supply must have over-current, overheating, short circuit protection, it should be the preferred protection in the design of switching power supply modules are available, and the technical parameters of the protective circuit with electrical equipment should match the operating characteristics to avoid damage to electrical equipment or switching power supply.
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