ocean.he@bohai-group.com
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High power program controller DC switching power supply is widely used in metallurgy, chemical industry and scientific and technological innovation field, most of the rectifier two tube or thyristor rectifier. It is inconvenient to adjust the output current or voltage smoothly in a large range. The simulation control system of the latter is difficult to guarantee the output performance of several DC switching power supplies with large power, while the use of servo control system can greatly improve the safety, reliability and integrity of the power supply. Therefore, digital control technology is outstanding, become a larger power program controller DC switching power supply.
Control technique
This system is a direct servo control system (ddc) system. 4 single chip microcomputer is used to replace the analog electronic circuit, to maintain full digital management control.
The system is controlled by dual-machine mode, and its function modules are dispersed by multiple computers. The trigger principle is maintained by 89c51. 16-bit single-chip 80c196kc realizes closed-loop logic operation control, and the single-chip uses parallel processing mode to communicate with each other. Dual machine parallel processing and logic operation, improve the system of high frequency rate and safety and reliability, and flexible design, good scalability, use performance is more cost-effective.
Control technology main process function modules: (1) self-adjusting power, power adjustment accuracy ≤±0.5; ② The output current has good followability. The input of the system is a 4-20ma current source signal provided by the configuration software, and the lag time of the output current following the input signal is less than or equal to 0.02s; (3) Function module of motor soft starter to prevent the impact of large current when starting; ④ Over voltage, loss voltage, overload protection and lack of consistent protection function modules. When the system is in stable heat transfer operation, the power can be cut out within 0.05s.
