How to ensure reliability during voltage dips in frequency converters

To ensure reliable operation of the frequency converter during voltage dips, it is essential to guarantee that its control core remains intact, the motor does not trip, and recovery is rapid. Voltage dips can cause a decrease in DC bus voltage and instability in the switching power supply output.

Protective measures include: selecting switching power supply modules with a wide input voltage range to maintain output voltage during voltage dips; installing sufficient capacity energy storage capacitors on the DC bus to provide energy buffering during momentary voltage drops in the grid; adding a supercapacitor or small-capacity backup battery to the power supply of critical circuits such as the control board and drives to form a temporary UPS; optimizing the detection and processing logic of the control software: monitoring the DC bus voltage in real time, and appropriately reducing the output frequency or entering derating mode when a dip is detected to reduce power demand; while maintaining control logic operation to avoid reset; performing non-volatile backups of important states and data; selecting power monitoring chips with a wide undervoltage protection range and recovery hysteresis; and verifying the equipment's performance under different dip depths and durations through voltage dip testing.

Yinte Electronics' high-performance capacitors and power monitoring devices support the construction of a reliable voltage dip response solution.