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与线性稳压电源相比,开关型电源具有体积小、重量轻、效率高等优点,因此,随着电子设备小型化、轻量化的要求不断提高,开关电源的应用越来越广。目前在国外电子设备的电源中,开关型电源已占90％以上。但是,开关电源的控制电路比较复杂,可靠性较差,设计、制作和维修都比较困难,严重影响了开关电源的应用。为了克服这些缺点,国内最近研制了开关电源专用厚膜控制电路。它与开关电源集成控制器相比:外围元件少、元件精度高、焊点少,可靠性高,开关电源的设计、制作和维修更加方便。 一、单端变换器厚膜控制电路HK01的结构和基本工作原理
Compared with the linear regulated power supply, the switch-mode power supply has the advantages of small size, light weight and high efficiency. Therefore, as the demand for miniaturization and weight reduction of electronic equipment continues to increase, the switching power supply is used more and more widely. Currently in the power of foreign electronic equipment, switching power supply has accounted for more than 90%. However, the switching power supply control circuit is more complex, less reliable, design, production and maintenance are more difficult, seriously affecting the switching power supply applications. In order to overcome these shortcomings, the domestic developed a special thick-film switching power supply control circuit. It compared with the integrated switching power supply controller: fewer external components, components, high precision, less solder joints, high reliability, switching power supply design, production and maintenance more convenient. First, single-ended converter thick film control circuit HK01 structure and basic working principle