Control device of frequency converter, frequency converter and control method of frequency converter

By setting up the main charging circuit and pre-charge circuit in the inverter and controlling the charging circuit switching in real time, the instantaneous current impact problem generated by the bus capacitor during the instant power-on in the inverter is solved, and the effect of protecting the device and extending the service life is achieved.

CN119652102APending Publication Date: 2025-03-18GREE ELECTRIC APPLIANCE INC OF ZHUHAI
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Patent Information

Application Number
CN202411818795.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

The instantaneous current generated by the bus capacitor during the instant power-on of the inverter has a great impact on the internal devices of the inverter, affecting the service life and in severe cases, it will cause device damage.

Method used

The main charging circuit and the precharge circuit are set in the inverter, and the bus voltage is sampled in real time through the hardware control circuit, and the charging circuit switching is controlled according to the switching status of the precharge contactor and the main charging contactor. When the bus voltage is lower than the preset voltage threshold, it is charged through the precharge circuit, and after charging is completed, switch back to the main charging circuit for power supply.

Benefits of technology

It effectively avoids the impact of the instantaneous current generated by the bus capacitor on the internal devices of the inverter, protects the device from damage, improves the reliability of the inverter and extends the service life.

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Abstract

The invention discloses a frequency converter control device, a frequency converter and a control method thereof, and the device comprises a sampling unit which is used for sampling the voltage of the output end of a bus capacitor unit after the frequency converter is powered on, and recording the voltage as the sampling value of the bus voltage of the frequency converter; the pre-charging control unit is used for controlling a pre-charging contactor to be switched on or switched off according to a sampling value of the bus voltage of the frequency converter so as to control a pre-charging loop to charge the bus capacitor unit and switch to a main charging loop after charging is completed; and the main charging control unit is used for controlling the main charging contactor to be switched on or off according to the sampling value of the bus voltage of the frequency converter so as to switch to the pre-charging loop for charging when charging is needed and switch to the main charging loop for power supply after charging is completed. According to the scheme, charging is performed through the pre-charging loop under the condition that the bus voltage is lower than the preset voltage threshold value, and power supply is performed through the main charging loop after charging is completed, so that internal devices of the frequency converter are protected from being damaged, the reliability of the frequency converter is improved, and the service life is prolonged.
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