The main reasons for adding an auxiliary power supply to a frequency converter are as follows:
1. Provide backup power
During operation, frequency converters may encounter main power failures or power outages. In such cases, auxiliary power supplies can serve as backup power, providing timely power to the frequency converter to ensure continuous operation and prevent production stoppages or equipment damage caused by power interruptions.
II. Stabilizing Voltage and Current
Frequency converters convert mains frequency power into DC power, and then convert the DC power into AC power with the required frequency and voltage to drive motors and other equipment. A stable power supply is crucial for the normal operation of the frequency converter. Auxiliary power supplies provide stable and reliable voltage and current to the frequency converter, ensuring the stability and safety of equipment operation. The role of auxiliary power supplies is particularly important when there are significant fluctuations in the mains voltage.
III. Protecting the Inverter
The auxiliary power supply also protects the frequency converter. It isolates the frequency converter from interference with the power grid, especially in cases of instantaneous voltage fluctuations and power outages, ensuring the frequency converter operates in a stable state. Furthermore, the auxiliary power supply features overcurrent and overtemperature protection, automatically cutting off power when the equipment load is too high or the temperature is too high, preventing equipment damage.
IV. Meeting the requirements of internal functional modules
Inside the frequency converter, besides the motor drive module, there are other functional modules such as power drive power supplies, analog circuit power supplies, digital circuit power supplies, and industrial interface power supplies. These functional modules require power supplies of different voltages and currents. After AC/DC and DC/DC conversion, the auxiliary power supply can output multiple power sources to meet the needs of various functional modules inside the frequency converter.
In summary, auxiliary power supplies play a crucial role in frequency converters. They not only provide backup power and stable voltage and current, but also protect the converter from grid interference and instantaneous voltage fluctuations, and meet the needs of the converter's internal functional modules. Therefore, adding an auxiliary power supply is an essential measure when using a frequency converter.
