抗干扰AC/DC开关电源芯片的研究与设计

Research and design of anti-interference AC/DC switching power supply chip

近年来,随着新能源技术的飞速发展,研发一种高效节能、使用年限长的电源芯片成为热点。AC/DC开关电源转换器源以其价格、效率、体积等优势在小功率电源领域得到了广泛应用。基于AC/DC开关电源转换器的工作原理,发现误差放大器对整个电源芯片的精度影响很大,介绍一种组合式的误差放大器,将轻载到满载的电压输出降低到40m V。提出了智能抗尖峰电路,减少了LEB结束与开关断开的时间差,提高安全性能。最后对本芯片进行试验测试,表明抗ESD能力达到10k V,芯片性能稳定。本方案可对今后电源芯片设计提供一定的技术参考。

In recent years, with the rapid development of new energy technology, developing a power supply chip with high efficiency,energy saving and long service life becomes a hot spot. AC/DC switching power supply converter source with its advantage of price, efficiency and volume, has been widely applied in the field of low power supply. Based on the working principle of AC/DC switching power supply converter, it is found that the error amplifier has a great influence on the precision of the power chip. A kind of combined error amplifier is introduced, which can reduce the output voltage to 40mV from a lighter load to full load. The intelligent anti-interference peak circuit is put forward, which can reduce the time lag of LEB end and switch-off, and improve the safety performance. The experiment of the chip test shows the anti-ESD ability is up to 10 kV, and the chip performance is stable. The plan can provide the technical reference for the design of power supply chips in the future.