By Zhanyou Sha, Xiaojun Wang, Yanpeng Wang, Hongtao Ma
A latest evaluate of switching energy layout tools with actual global applications
• Written by way of a number one writer well known in his field
• makes a speciality of switching strength offer layout, manufacture and debugging
• Switching strength provides have relevance for modern purposes together with cellular phone chargers, laptops and PCs
• in response to the authors' profitable "Switching energy Optimized layout second variation" (in Chinese)
• hugely illustrated with layout examples of actual global purposes
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After the 1st strength plant in historical past was once commissioned for advertisement operation through Thomas Edison on Pearl road in big apple in 1882, electrical energy used to be offered as a client product at industry costs. After a interval of fast improvement, electrical energy had develop into this kind of basic product that rules used to be believed to be helpful.
A modern evaluate of switching strength layout equipment with actual international functions• Written by way of a number one writer well known in his box• specializes in switching energy provide layout, manufacture and debugging• Switching strength provides have relevance for modern purposes together with cell phone chargers, laptops and desktops• in keeping with the authors' winning "Switching strength Optimized layout second version" (in Chinese)• hugely illustrated with layout examples of actual global purposes
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Additional info for Optimal design of switching power supply
It turns out that power consumption of TOPSwitch in continuous conduction is higher than that of discontinuous conduction. That’s because there is extra energy on distributed capacitance CD . In addition, it is necessary to charge secondary leakage inductance LSO before turning off the secondary winding output, which generates cross-over current when IS increases and IPRI wanes. Once LSO is fully charged, the output rectifier would be cut off by a reverse bias and the secondary current IS would change into zero.
As ED is in direct 26 Optimal Design of Switching Power Supply proportion to U 2 CD , the power efficiency would be significantly declined when CD has a big volume, and it is even more true when UI is rather high. It should be noted that because the high-frequency transformer at stage 1 is gathering energy and the current of the secondary winding is zero, the impact of leakage inductance can be ignored. In stage 2, TOPSwitch is turned off. At the previous stage, energy stored in the high-frequency transformer is transmitted to the secondary winding.
Determine the induced voltage. Determine the inductance value of primary side of high-frequency transformer. Select an applicable SMPS chip according to the drain-source electrode peak current of the input power and power switch tube. Determine the applicable magnetic core and the minimum number of turns of the primary winding. Determine the number of turns of output winding and the circuit of auxiliary power. Determine the starting resistance. Determine the wire diameter of each winding. Select the output rectifier diode.