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Q 1. What is the safety specification for switching power supplies?
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  The safety specification of switching power supply is referred to as "safety regulations". The name of the IEC 950 standard is "Information technology equipment including the safety of commercial electrical equipment". This standard specifies the design requirements for safety equipment to prevent damage or damage that may result from certain hazards. These hazards include electric shock, electrical damage, fire, mechanical and thermal damage, radiological damage, and chemical damage. Details
Q 2.What is the difference between the operating voltage of the switching power supply and the safety ...
- A
  The operating voltage of the switching power supply is the highest voltage that the insulating material can withstand when the device is operated at rated voltage under normal operating conditions. The safety extra low voltage (SELV) refers to a circuit with a safety voltage protection function. Under normal operating conditions and under single fault conditions, the voltage between any two adjacent parts of the secondary circuit or between the voltage of a part and the protective earth gr... Details
Q 3.What is the insulation type and creepage distance of the switching power supply?
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  Switching power supply insulation types are divided into the following three: (1) basic insulation: to provide basic protection against electric shock insulation. (2) Double insulation: Insulation consisting of basic insulation plus additional insulation. (3) reinforced insulation: a single insulation structure, which provides the level of protection against electric shock equivalent to double insulation. Creepage distance refers to the shortest distance between two conductive parts or betwe... Details
Q 4. How to correctly measure the maximum ground leakage current of the switching power supply?
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  At maximum input voltage, the maximum ground leakage current of the switching power supply must not exceed the specified limit. For class II equipment, when the output is not connected with the earth, should be accessible on the conductive parts of the test; and for the non-conductive parts can be touched on the part of the parts in the area of less than 10cm × 20cm metal foil To measure. Details
Q 5. What is a safety isolating transformer?
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  A safety isolating transformer is a power transformer capable of isolating a winding to the SELV circuit from other windings, such as primary windings and primary side bias windings. So that even if the insulation is punctured, the SELV winding will not cause a dangerous situation. Details
Q 6. What is safe discharge?
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  Safe discharge means that the equipment is designed to ensure that there is no risk of electric shock due to the discharge of the charge connected to the supply circuit capacitor when the power supply is disconnected. If the capacitor in the equipment with a capacity greater than 0.1uF is connected to the external grid, the discharge must be made to discharge and the time constant of the discharge shall be less than 1 s. This requirement is particularly applicable to any EMI filter capacitor tha... Details

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