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一、概况把单相电转变为频率可调的三相电的静止劈相机,其控制系统以往是由模拟和逻辑电路构成的。本文将讨论一个以Z-80CPU为核心的新型控制系统,本系统的主要特点是:①使用一个CPU就完成了二段桥控制、逆变器控制、起停控制、报警控制和掉电处理以及部分诊断功能;②采用了参数可输入的、快速的数字调节器,参数整定方便;③系统按多级中断方式工作,实时性强;④硬件电路简单,成本低,可靠性高;⑤采用了抗干扰措施,在噪音环境中亦能可靠工作。该系统在现场带2.5千瓦和22千瓦风机负载运行,结果表明:风机起动过程平稳,不产生冲击电流;风机转速可随设定值和环境温度的变化而平滑地改变(在120rpm～3000rpm之间);当现场网压从180V～230V变化且供电质量较差时,系统运行仍很稳定。
First, an overview of the single-phase electrical conversion into a three-phase frequency adjustable static chop camera, the control system in the past is composed of analog and logic circuits. This article will discuss a Z-80CPU as the core of the new control system, the main features of the system are: ① using a CPU to complete the second-stage bridge control, inverter control, start-stop control, alarm control and power-down processing and Part of the diagnostic functions; ② using the parameters can be entered, fast digital regulator, parameter tuning easy; ③ system by multi-level interrupt mode, real-time; ④ hardware circuit is simple, low cost, high reliability; Anti-interference measures can work reliably in noisy environments. The system is operated with 2.5 kW and 22 kW fans on site. The results show that the fan starts smoothly and does not produce inrush current. The fan speed can be changed smoothly with the set value and the ambient temperature (between 120rpm and 3000rpm ); When the site network voltage changes from 180V ~ 230V and the power supply quality is poor, the system operation is still very stable.