Each inverter has a braking unit (low power is braking resistor, high power is high power transistor GTR and its driving circuit), low power is built-in and high power is external.
The braking resistor must be selected according to the specifications of the frequency converter.
Extended data:
Frequency converter classification
1. Classification by input voltage level
Inverter can be divided into low-voltage inverter and high-voltage inverter according to the input voltage level. Common low-voltage inverters in China include single-phase 220 V inverter, three-phase 220 V inverter and I-phase 380 V inverter. High-voltage converters generally have 6 kV and 10 kV transformers, and the control mode is generally changed by high-low frequency converters or high-low frequency converters. ?
2. Classification by frequency conversion method.
Frequency converters are divided into AC-AC frequency converters and AC -DC frequency converters according to frequency conversion modes. AC-AC converter can directly convert power frequency AC into AC with controllable frequency and voltage, so it is called direct inverter. The AC-DC-AC frequency converter first converts power frequency alternating current into direct current through a rectifier device.
Then the direct current is converted into alternating current with adjustable frequency and voltage, so it is also called indirect frequency converter. ?
3. According to the nature of DC power supply.
In AC -DC- AC converter, DC power supply is divided into voltage converter and current converter according to the process of converting main circuit power supply into DC power supply.
Baidu encyclopedia-frequency converter