Analysis of Interference in Refrigerator Compressor System

After the refrigerator is started up, the program is initialized to determine whether the working voltage is normal, and if the voltage is too high or too low, the fault lamp indicator will flash. During the start-up phase, the motor runs from the stopped state to the closed-loop operation. To ensure fast and stable start-up, the open-loop operation is used to increase the speed, and then it is switched to the semi-closed-loop state and finally enters the closed-loop operating state.

In the process of closed-loop operation, AD is required to detect the setpoint value of the speed in real time. Different speeds are used in the high and low speed states. The Ningbo air compressor software PID differential adjusts the PWM duty cycle to ensure efficient and stable operation of the compressor. The over-current protection signal is monitored in real time. Once over-current is detected, the main program is skipped and over-current protection processing is performed quickly.

Refrigerator compressor system is affected by the specific working environment and cooling conditions, while high voltage or high current and other factors will also interfere with back-EMF zero crossing detection. This will cause certain errors in DSP's identification of WAVE signals. Therefore, software needs to be considered. Leakage detection, misdetection caused commutation failure, in order to improve the reliability of the compressor operation.

After the program enters the back-EMF zero-crossing point judgment function, it first needs a counter to count, and a three-lobe Roots vacuum pump records the angle value of the interval between two adjacent zero-crossing points. The counter value is compared with the already estimated good angle value to determine whether the counter exceeds a 90° angle (75° or other angle can be set according to actual needs). Next, it is judged whether the counter is less than 30 degrees. If it is, then the interval between the current detection and the previous time is too short. The program determines that this time is a false detection, and the counter will be cleared to prepare a new count. If the counter 90° judges that the time value has exceeded 90°, it means that the program may have missed the zero-crossing point. It needs to force the commutation and record the number of leak detections. When the number of leak detection times is too high, it needs to be noticed. It needs to stop for 30s. Try to restart afterwards.

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