电气自动化
電氣自動化
전기자동화
ELECTRICAL AUTOMATION
2014年
2期
89-90,109
,共3页
仿复用总线%SA8428%板坯电磁搅拌器%P87LPC767%可编程序控制器
倣複用總線%SA8428%闆坯電磁攪拌器%P87LPC767%可編程序控製器
방복용총선%SA8428%판배전자교반기%P87LPC767%가편정서공제기
emulating multi-bus%SA4828%slab electromagnetic stirring (SEMS)%P87LPC767%PLC
为了节约单片机端口，SA4828芯片与P87LPC767单片机采用仿复用总线模式相连构成了板坯电磁搅拌器控制系统。SPWM脉冲由SA4828芯片产生，波形参数由单片机设定。系统利用SA4828芯片的单相电压幅值可调功能，产生相位相差90°、频率和强度可控的线电流，满足了板坯电磁搅拌的工艺要求。由于板坯电磁搅拌工作频率低，P87LPC767采用内部振荡信号， SA4828振荡信号由P87LPC767的ALE信号提供，简化了电路，增加了可靠性。
為瞭節約單片機耑口，SA4828芯片與P87LPC767單片機採用倣複用總線模式相連構成瞭闆坯電磁攪拌器控製繫統。SPWM脈遲由SA4828芯片產生，波形參數由單片機設定。繫統利用SA4828芯片的單相電壓幅值可調功能，產生相位相差90°、頻率和彊度可控的線電流，滿足瞭闆坯電磁攪拌的工藝要求。由于闆坯電磁攪拌工作頻率低，P87LPC767採用內部振盪信號， SA4828振盪信號由P87LPC767的ALE信號提供，簡化瞭電路，增加瞭可靠性。
위료절약단편궤단구，SA4828심편여P87LPC767단편궤채용방복용총선모식상련구성료판배전자교반기공제계통。SPWM맥충유SA4828심편산생，파형삼수유단편궤설정。계통이용SA4828심편적단상전압폭치가조공능，산생상위상차90°、빈솔화강도가공적선전류，만족료판배전자교반적공예요구。유우판배전자교반공작빈솔저，P87LPC767채용내부진탕신호， SA4828진탕신호유P87LPC767적ALE신호제공，간화료전로，증가료가고성。
In order to save single-chip processor port resources,chip SA4828 and single-chip processor P87LPC767 are connected in the emulating multi-bus mode to compose the slab electromagnetic stirrer control system,with SPWM pulses generated by SA4828 and wave parameters being set through the single-chip processor.In the system,the function of adjustable single-phase voltage of SA4828 is used to generate a line current with 900 phase difference and controllable frequency and strength,thus meeting the technological requirement of the slab electromagnetic stirring.Due to the low working frequency of the slab electromagnetic stirring,as well as the internal oscillating signal adopted in P87LPC767,the ALE signal of P87LPC767 provides the oscillating signal for SA4828,thus simplifying the circuit and improving its reliability.
