Multiple Cnc Precision Switching Power Supply Control System

Having overcome the disadvantages of ponderous, inefficient linear power source, switch power supplies are widely applied in power motion, industrial, communication, PC, office and family electronics equipment etc. But the ripple and low precision make it impossible to replace linear power source completely. Digital control can improve the performance of switch converter and is one of the directions of precise source. A high performance integrate multi-output switch power supply is used as an example to illustrate the main techniques of digital controlled intelligent source module.According to the control requirement, a dual-CPU-dual-RAM-based control system completes the calculation, outputs synchronization of multi-signal reference source, the serial communication, the adjustment of DC bus and the intelligent gradation. Dual RAM can improve the reliability and real-time response speed. At the same time, the following-adjustment and sampling resistor gradation make full use of software and hardware, and give great help to the high resolution.Two sets of unique protocol are used in dual-CPU data exchange and SC (Serial Communication) with PC to ensure the efficiency and reliability. FIFI (First In First Out) & dual-RAM protocol combining the advantages of hardware detection and software judge harmonizes the time sequence with high security. Short frames in SC protocol make the data construction clear and easy to be identified. At the same time, the perfect fault-correction system reduces the possibility of data transfer error.A signal-generated scheme that is used in high solution AC source is presented based on the reasonable usage of system source. By discussing the methods of counter-output, PLL (Phase-Locked Loop) -output and DDS (Direct Digital Synthesization) -output, DDS -based dummy-space method is brought out and it converts the time problem into space, improves the resolution of both frequency and phase-shift. Harmonic can also be generated by this way.The schemes above are used in a high resolution Multi-output Digital Control Switch Converter: ultimately test their feasibility and superiority.