ISP-PLD控制的数字化中频电源

中频电源是金属熔炼、锻压透热、表面热处理和材料焊接的重要加热手段，晶闸管中频电源具有体积小、质量轻、效率高、噪声小、操作简单、维护方便等优点，已成为中频电源的主流。本文研制了以ISP—PLD为控制核心的数字化晶闸管电源，控制电路中输入和输出ISP-PLD的信号皆为数字量，其内部也采用数字运算，实现了电源的数字触发、输出特性控制、零压扫频启动等功能。介绍了ISP-PLD的原理、特点以及开发方法和步骤。

Medium-frequency Power Supply Controlled by the ISP-PLD

Medium-frequency power supplies are widely used in applications of metal refining, forge heating, surface heat-treating, welding and brazing. In the cause of small volume, little mass, high productive, low noise, easy to operate and maintain, thyristor controlled medium-frequency power supplies are becoming leading-equipments. A thyristor controlled medium-frequency power supply, whose control circuit is base on a digital chip of ISP-PLD, is developed. Signals inputting and outputting the ISP-PLD are all digitals. The functions, such as digital triggering, U-I curve controlling and zero voltage scan starting, are carried out by the chip. In the meantime, the principle, characteristics as well as developing method and procedure of ISP-PLDs are introduced.