外文翻译——基于压降型pwm开关电源的建模、仿真和单片机简介-单片机(编辑修改稿)

外文翻译——基于压降型pwm开关电源的建模、仿真和单片机简介-单片机(编辑修改稿)内容摘要：

, is it should take place unnecessary change for low pin to make regularly, so, should resume the state. of all pins immediately after being restored to the throne. There are 2 kinds of methods : ① Analyze and judge immediately after being restored to the throne this time, provide the state of the pin according to the need。 ② In being RAM it is the last state that e down, these RAM when restored. To the throne regularly can the zero clearing one。 But electricity or manual to restore to the throne when pushing in conformity with zero clearing, is it embody to want when the software is worked outing at the beginning. If calculate time allows, try one39。 s best to take method 1. Restore to the throne cycle probability made mistakes to calculate very little, according to 2 for the 2nd time in succession. 4 output end son that narrate connect treatment method of electric capacity in parallel, can reach kind antiinterference result very. realizes crossing over and is restored to the throne alternate time sequence regularly to control Work in way of restoring to the throne now, start anew and carry out the same procedure repeatedly each time. Can be divided into 2 kinds of situations: ① As to simple to show instrument, carry on measurement ， send off showing after being restored to the throne each time, have causality between restoring to the throne twice . need is it switch over to the dormancy to waiting original only. Should pay attention to, measurement, give total time used to show is it is it restore to the throne low electricity at ordinary times to smaller than to want, otherwise can39。 t present forever the mistake of the intact executive program. ② For having application that time sequence controlled , after being restored to the throne each time , should check first that see the sign left last cycle , in order to determine what is done this cycle . That is to say every is it restore to the throne operation of cycle to stride , by is it transmit to indicate all, these indicate while leaving in inside RAM , the zero clearing only when have the electricity for the first time. For example, the protecting synthetically device of abovementioned voltage transformer , is restored to the throne regularly according to the interval of 20ms. It reaches the normal working state through, certain movement order after having the electricity, such as Fig. 4。 Write a part of the procedure of the software according to this movement, such as Fig. 5. In 4 Fig, act as person who protect the beginning at the electricity, is it transmit power 0 to try at first. 5s, points out and transmits power soon。 Transmit power formally after waiting for 30s. It is startup time in 1s after transmitting power, does not measure the electric current. Start after finishing, if all going well, the location is put normal sign , person who protect restore to the throne cycle enter normal running in the next one. Try 0 that transmits power. 5s is it is it realize to count once restoring to the throne to delay time, restore to the throne time 20ms each time. At having electricity for the first time, make all zero clearing to inside RAM, make it is it time Ts to transmit power not to try =Dormancy after 25. After restoring to the throne, is it have electric pin to have electricity for the first time already, is it is it is it is it time the measuring of Ts to transmit power to try to get to go on to measure next time. If Ts * 0, is it in is it prolong period to transmit power, is it enter dormancy after the 1 to reduce Ts to prove. Act as Ts1 = 0, the course which waited for 30s that should enter and lose electrical power. Just when Ts decreases progressively to 0, make it is it indicate to wait for not to lose electrical power Td =1500. When the procedure is restored to the throne beginning again, measure to Ts =0 but Td * 0, is it is it is it transmit power to try to cross already to indicate, at is it wait for the course of 30s to lose electrical power now. In this way, the whole process is transmitted each other by such these parameters as Tr, Td , Ts etc, go on step by step. Result: Conclusion Antiinterference is an important problem in an electronic design, especially Important in the onechip puter. This is because the onechip puter has procedures to run particularity that flies, the consequence that it is interfered may be the system halted, may send out various kinds of mistakes or illegal movements before the system halted too, make the whole system produce the mortality mistake. So, only guarantee it is not enough yet for onechip puter not to crash, study how to reduce the risk interfered, it can befaulttoierant how is it after and make mistakes. This text is it act as some exploration from two these to try hard, hope these elementary opinions can play some function of casting a brick to attract jade, helpful to everybody。 Hope too every colleague explore together, improve our design level together. semiconductors make it possible to have high speed and high frequency switching in power electronics 1 . High speed switching causes weight and volume reduction of equipment, but some unwanted effects such as radio frequency interference appeared 2 . Compliance with electromagic patibility (EMC) regulations is necessary for producers to present their products to the markets. It is important to take EMC aspects already in design phase 3 . Modeling and simulation is the most effective tool to analyze EMC consideration before developing the products. A lot of the previous studies concerned the low frequency analysis of power electronics ponents 4 5 . Different types of power electronics converters are capable to be considered as source of EMI. They co。