The control system is composed of AT89C52, a high-powered 8-bit microcontroller, data gathering circuit, real timecircuit, data output circuit and system watch circuit.
It proves that it is superior to use the "deviation input" to the "absolute-value input" and better to use timecircuit with variable time constant than to use square circuit.
As a try for circuit standardization, the system realizes the standard protection circuit unit and recovering-timecircuit unit, which are connected to system through standard 44 pins' bus interface.