【摘要】 分频调速是一种崭新的节能方法。介绍了分频调速的涵义,给出了主电路和矩阵式电子开关原理图,指出分频电路的9只双向晶闸管可分为三组,随后定义了开关函数S和开关矩阵S,并推导了分频电路的实现原理。其次介绍了在实现过程中需要重点解决的两大关键技术:一是在自然换相点处的电压过零触发和电流过零触发方式减少了内存占用;二是利用逻辑电路构成防误触发措施,根据脉冲的特点列出了真值表,并以此为依据设计了逻辑电路。从使用中验证,该装置对有级调速的风机、水泵负载是低投入、高回报的选择。更多还原

【Abstract】 Divided-frequency speed regulation is an energy-saving method. The connotative meaningof divided-frequency speed regulation is introduced. Its main circuit and matrix switch principle are presented,in which the nine bidirectional thyristors are divided into three groups. The switch function S and switch matrix S are defined,and the realization principle of divided-frequency circuit is deduced. Two key technologies are focused on. The zero - cross-over triggering of voltage and current at natural commutation point reduce the memory occupation. The logic circuit is used to avoid mis-triggering,which is designed based on a truth table listed according to the pulse cha-racters. Practice shows that it’s efficient with low cost for the fan and pump loads with step regulation.更多还原