Research On Voltage Signal Measurement And Insulation Performance Evaluation Method Of Switching Power Supply Products

In today's society,it has become an indispensable tool in people's daily life.Such as mobile phones,tablet PCs,set-top boxes,printers,copiers and other products are the most common products in our work and life.However,it is not uncommon for information technology products to meet the requirements of safety accidents.At present,China has referred to the mandatory safety standards GB4943.1-2011 "information technology equipment safety in first parts: General requirements" for the safety of such products mandatory testing.These products are usually used to switch power supply,the actual test,the power supply is often among the heavy.Working voltage in power supply is an important indicator of safety of information technology equipment detection,detection in standard GB4943.1-2011,working voltage refers to equipment at its rated supply voltage under normal working conditions,according to the operation,need to withstand insulation or can withstand the maximum voltage considering the effective value of voltage is the effective value contains all the working voltage of the DC component;peak working voltage refers to include all the repetitive peak voltage pulse form all DC components and equipment in the.The working voltage is determined to determine the safety insulation performance of the product,such as the electrical strength of the product,electrical clearance and creepage distance.If the working voltage measurement is not accurate,it will directly lead to the design of the device to produce a number of security risks.Information technology equipment many times the use of switching power supply to power supply,because the characteristics of high frequency switch transformer,usually has a real working voltage of the primary voltage between the switching power supply is greater than the rated input value,or to achieve a specific power requirements of products with high output condition,all the products,determine the working voltage is the key.However,due to the measurement for the working voltage of a simple description of general GB4943.1-2011 standards,have a different understanding of each laboratory,the measurement of voltage in the same type of data gap in power supply products.The switching power supply products for the test object,introduced the basic situation,consider switching power supply voltage detection,power supply for L/N polarity,TN-S power supply network,oscilloscope grounding,oscilloscope probe selection,oscilloscope signal coupling and signal collection form,voltage waveform of different effective value and instrument first,the input impedance of very common potential selection,effect of load state and other factors on the test results.In determining the waveform and numerical work voltage,from the standard understanding perspective to make definition of the content of the work voltage of understanding,and then combined with the example of switching power supply products to evaluate the insulation parameters(dielectric strength,electrical clearance and creepage distance.)...