“In the global environment of energy saving, environmental protection and smart interconnected terminals, energy saving, high frequency, high efficiency, miniaturization and intelligence are the future development trends of the power supply industry. The wide application of new low-energy devices, the optimization of PMIC design, and the emergence of the third-generation semiconductor material SiC/GaN MOSFET technology are driving subversive changes in the power electronics industry. These new devices increase the efficiency of the entire power conversion system by several percent.
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In the global environment of energy saving, environmental protection and smart interconnected terminals, energy saving, high frequency, high efficiency, miniaturization and intelligence are the future development trends of the power supply industry. The wide application of new low-energy devices, the optimization of PMIC design, and the emergence of the third-generation semiconductor material SiC/GaN MOSFET technology are driving subversive changes in the power electronics industry. These new devices increase the efficiency of the entire power conversion system by several percent.
Power supply design and development is a technical task, and it is also a tiring task. The work is complicated and challenging. The power supply design engineer selects the appropriate device and topology structure according to the task book, and designs the prototype version that meets the function. The optimization of the power supply design is especially important. In order to ensure the realization of functions, but also to take into account all aspects of efficiency, cost and EMC, the final product also needs to carry out overall power quality evaluation and industry standard certification.
Power test engineers will go through four stages of power device selection, power prototype design, power quality analysis, and final product certification in the process of power testing. Each stage will face different pains.
What are the test difficulties that power test engineers are concerned about? After visiting hundreds of test engineers, Tektronix summed up the test pain points of engineers and found that efficiency is a very important concern of power supply design engineers, and how to determine the main power loss points is very important. The traditional theoretical calculation method has many shortcomings. Because the actual power supply is different, the design structure is different, and the loss during the period is very different. Therefore, engineers need tools and methods that can accurately test the main power loss switching devices and passive devices.
Stage 1: Pain Points in Power Device Selection
– Unable to accurately grasp the characteristics of new low-power ICs and power devices in the market? Whether it really plays the biggest role in its own power supply design, there is a lack of a simple and economical evaluation method.
– For power product design, the selection of high-power switch tubes is very critical and difficult. How to test the characteristics of IGBT modules before system commissioning, especially based on bridge topology, test the characteristics of IGBT and corresponding diodes under different load conditions? Being an engineer is a big headache.
Stage 2: Pain points of prototype design
– Test the input and output signals in the power supply function design, the signal waveform and the main parameter indicators. For the evaluation of the system, whether the test equipment can reliably and accurately reflect the real signal characteristics is a problem that engineers are very concerned about, and they are worried that a certain test will be misleading.
– As the main components of the switching power supply, MOSFET and IGBT have become the most important factors affecting the overall efficiency of the power supply. In different applications, the driving conditions are different, and the power consumption varies greatly. How to quantitatively evaluate the loss in the real power supply has become a very concerned issue. .
– The emergence of the third-generation wide-bandgap semiconductor devices GaN and SiC has driven subversive changes in the power electronics industry. The new switching device technology achieves low switching losses, can handle ultra-high-speed dv/dt conversion, and supports ultra-fast switching switching frequencies. The test challenges brought by it have also become an engineer’s nightmare.
– How to evaluate the impact of magnetics on power supply stability and overall efficiency? How to test inductance, magnetic loss, BH curve, magnetic properties and other indicators is a difficult problem for engineers.
– Engineers need to spend more time and energy on power integrity (PDN), in addition to the switching loss, input power quality, output ripple test, etc. that we often mention, we will also involve loop response testing , through the loop response test, we can know how stable our feedback loop is?
– Power output quality is an important part of power supply evaluation, especially for DC output, it is not only necessary to test the voltage and current, but also to accurately test the output ripple, especially for some special power supplies, the ripple needs to be controlled within With a very small range, how to accurately test tiny ripple signals is tricky.
Stage 3: Pain Points of Power Quality Analysis
– After the product design is completed, efficiency is its most important indicator. How to accurately evaluate the power quality? Active power, power factor, efficiency, etc.?
– To meet the standard harmonics of the power supply industry is a very critical indicator. How to accurately evaluate power harmonics and how to pass the IEC61000-3-2 standard conformance test at one time?
– It is very important for energy-saving certification of power products. How to accurately evaluate the pre-compliance standard IEC62301 v2.0 of power standby power consumption?
Stage 4: Pain points of final product certification
– The power supply needs to pass CE certification before going on the market, and the most important one is the EMC conformity certification. Many engineers have to take into account the challenges of EMC while implementing functional design. How can engineers understand the EMC status of power products and pass the certification at one time?
– The last process of the power supply product requires a long-term oven test. How to improve the efficiency, especially in the case of mass production, an accurate and efficient test method is very important.
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