毕业论文英文翻译---20xx电气工程及自动化

毕业论文英文翻译---20xx电气工程及自动化内容摘要：

cutoff or cut off the input power. G、 Overtemperature protection Switching regulator and the high level of integration of lightweight small volume, with its unit volume greatly increased the power density, power supply ponents to its work within the requirements of the ambient temperature is also a corresponding increase. Otherwise, the circuit performance will deteriorate premature ponent failure. Therefore, in highpower switching regulator should be set up overtemperature protection. Relays used to detect the temperature inside the power supply temperature, when the internally generated power supply overheating, the temperature of the relay on the action, so that whole circuit in a warning alarm, and the realization of the power supply overtemperature protection. Temperature relay can be placed in the vicinity of the switching transistor, the general highpower tube shell to allow the maximum temperature is 75 ℃ , adjust the temperature setting to 60 ℃ . When the shell after the temperature exceeds the 桂林电子科技大学毕业设计英文资料 翻译 4 allowable value to cut off electrical relay on the switch protection. Semiconductor switching device thermal hot thirstier, in the overtemperature protection, played an important role. It can be used as directed circuit temperature. Under the control of photgate thirstier (TT102) characteristics, by RT value to determine the temperature of the device turnon, RT greater the temperature the lower the turnon. When placed near the power switching transistor or power device, it will be able to play the role of temperature instructions. When the power control the temperature of the shell or the internal device temperature exceeds the allowed value, the heat conduction thirstier on, so that LED warning light. If the opt coupler with, would enable the whole circuit alarm action to protect the switching regulator. It can also be used as a power transistor as the overtemperature protection, crystal switch the base current by ntype gate control thirstier TT201 thermal bypass, cutoff switch to cut off the collector current to prevent overheating. H、 The future development of relay protection Protection technology to future trends is puterized, work, intelligent, protection and control, measurement and data munications integration development. 1) Computerized Along with the rapid development of puter hardware, microputer protection and development in hardware. Former north electricity institute of puter line protection hardware has experienced three development stages: from eight single CPU structure of the microputer relay protection, less than 5 years time to develop more CPU structure, and to develop the large don39。 t bus module, performance greatly improve module structure, widely used. Huazhong university of science and technology development of microputer protection from 8 bits CPU, is the core part in polymerizingkettle development based on 32bit microputer protection. Nanjing institute of electrical automation began a 16bit CPU is developed on the basis of puter line protection, has been widespread in the study, also protect the hardware system 32 bits. The development of southeast university puter hardware and equipment to protect and improve through a lot. Tianjin university is a start with more than 16 bits CPU developed on the basis of puter line protection, which began in 1988 study 32bit digital signal processor (DSP) for the protection and control, measuring devices, microputer integrated with Zhuhai jin electrical automation equipment pany developed into a fully functional 32bit big modules, a module is a small puter. Using 32bit microputer chip is not only because the accuracy and precision of the A/D converter by the resolution limit, more than 16 when converting speed and cost is unacceptable, More important is the 32bit microputer chip with high integrity, high frequency and puting speed and large 桂林电子科技大学毕业设计英文资料 翻译 5 space, rich addressing the mand system and more input output. The CPU registers, data bus, the address bus are 32bit memory management function, and memory protection function and tasks, and the conversion function will Cache (Cache) and floatingpoint ponents are integrated in the CPU. 2） Network Power system of microputer protection requirement, besides improving the basic function of protection, also should have the capacity of the fault information and data storage space, longterm fast data processing function, strong munication ability, and other protection and control devices and the whole system by sharing work dispatching data, information and work resources, the ability to program in a highlevel language, etc. This requires microputer protection device is equivalent to a PC. In the early development of puter to protect, once thought to use a small puter finish relay protection device. Due to the large size, then miniputers high cost and reliability of this idea is not reality. Now, with microprocessorbased protection function of similar size, speed, workmanaging machine greatly exceed the storage capacity of miniputer, therefore, make use of the relay protection sets polymerizingkettle time is ripe, this is the development direction of the microputer relay protection. Tianjin University has developed with microprocessorbased protection device with an identical structure reform polymerizingkettle of relay protection device. This device has several advantages: (1) 486PC machine can meet all the functions of the current and future demands of。