反激变换器中整流二极管温度补偿电路的设计

Ling-feng Shi, Y. J. Chang, Hui-sen He, H. Nie, Y. Zhao
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引用次数: 4

摘要

提出了一种用于一次侧控制反激变换器的整流二极管温度补偿电路。通过补偿二次侧整流二极管正向电压随温度的变化,可以有效地提高高温下反激变换器输出电压的误差率。该电路的设计是基于双极晶体管基极-发射极电压VBE的负温度特性。此外,该电路还可提供过温保护。基于0.5 mm双极互补金属氧化物半导体工艺的仿真结果表明,补偿电压在125°C时为0.1 V,在25°C时为0 V。在温度25 ~ 125℃范围内,带补偿的反激变换器的最大输出电压错误率为3.8 ~ 0.6%。热停机阈值为140℃,过温保护迟滞阈值为110℃。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Design of rectifier diode temperature compensation circuit in flyback converter
A rectifier diode temperature compensation circuit is presented for primary-side controlled flyback converter. By compensating the variation of secondary-side rectifier diode forward voltage with temperature, the error rate of output voltage in flyback converter will be effectively improved at high temperature. The design of the circuit is based on the negative temperature characteristics of the base-emitter voltage VBE of bipolar transistors. Besides, the circuit can also provide overtemperature protection. Results of simulation based on 0.5 mm bipolar complementary metal oxide semi-conductor process show that the compensation voltage is 0.1 V at 125°C and 0 V at 25°C. The maximum output voltage error rate of flyback converter with compensation is from 3.8 to 0.6% under the temperature between 25 and 125°C. The thermal shutdown threshold is 140°C, and the over-temperature protection hysteresis threshold is 110°C.
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