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All digital inputs and outputs of the inverter are isolated through photocoupler. In addition to the optocoupler isolation, the trigger pulse output circuit of the thyristor is also isolated by a transformer to prevent reverse interference of the higher voltage of the main circuit. In the loop Also used 01 circuit to improve its anti-interference ability. To ensure the normal operation of the computer floating, analog input port ground and the computer ground should be isolated. Although the use of isolating amplifier can be isolated inside and outside the ground, but because of such amplifier module using transformer coupling technology, anti-interference ability is limited, the test found that a narrow peak pulse interference can flee into the computer sampling and conversion circuit, resulting in Control error. To this end, in the analog to digital into the computer before the amount of each digital optocoupler isolation.
Because the optocoupler is a current-mode device, it can suppress the narrow glitch jamming signal better and get better anti-interference ability and higher conversion accuracy. Power anti-interference: Microcomputer power supply using ferromagnetic AC voltage regulator, super isolation transformer, low-pass filter, anti-interference type microcomputer switching power supply. Experiments show that this system has a good anti-jamming performance, to ensure that the microcomputer from the AC power supply interference, the external circuit power supply from the AC regulator leads to another super-isolation transformer to prevent the external circuit and between the microcomputer The mutual interference. Other anti-jamming measures are: signal input filter network, digital filtering procedures, trap procedures, the use of integrated circuits, power lines and control lines separate wiring, computer signal lines using shielded cable.
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