全自动综合视力检查仪的降压转换电路设计

Design of Voltage Regulator for Refractor

全自动综合视力检查仪对电源的幅值和噪声要求苛刻,220 V交流电经整流降压后的电压为+24 V,噪声较大,通过降压转换器LT1074可以提供高精度的+5 V电压.介绍了LT1074降压转换器的特点和性能,给出了应用于全自动综合视力检查仪降压转换电路的实例.

The requirements of the power's voltage and noise are very critical for refractor.The voltage is +24 V after the alternating voltage 220 V is converted,and the voltage can be converted to +5 Vby the voltage regulator named as LT1074.The features and characteristics of the LT1074 are introduced,and the application circuit in refractor has been designed.