We really talked a lot about the relevant knowledge of inverter repair, but we talked less about the main reasons for protecting the main power supply circuit. Then take a look at the introduction below:
When there is a problem in the main power supply circuit of the inverter, in addition to selecting each component to match the corresponding power, the circuit buffering should also be considered. We know that the charging current of high-voltage large-capacity capacitors in the initial stage of charging is very large. If left unchecked, it can have a significant impact on its circuit components and input power supply. For the small power, the method of series negative temperature coefficient (NTC) on the charging circuit is generally selected, that is, the resistance value of NTC is larger at room temperature, so that the charging current of the capacitor will not be too large when the circuit is initially energized. Once the resistance of the NTC decreases due to heating, the voltage of the capacitor has now reached a very high level, so the charging current will not be too large, and it will not affect the capacitor's demand for power supply in the later stage.
The relationship between the fault of the main power supply circuit to be repaired and the three-phase communication voltage: after the three-phase communication voltage is rectified by the bridge, the high-voltage capacitor is charged in series. Small and medium-power charging protection circuits often use a combination of charging resistors and relays to complete buffer protection. After the communication power supply is rectified, the capacitor is charged through the charging resistor r in series, and the charging voltage is detected by the internal circuit. When the capacitor voltage rises to a certain value, the relay action contact will short-circuit the charge resistor. At this moment, the current is rectified and directly charged the capacitor. Since the capacitor has now been charged to a certain voltage, the current effect of direct charging with the shielded charging resistor is now minimal. For the high-power type, the principle and structure of the buffer circuit of the main power circuit are the same as those of the small and medium-power type, except that the relay is replaced with a thyristor, there is no impact of the mechanical contact of the relay, and it can pass through a large current.
After the above analysis of the machine, we know that the main reason for the failure of the main power supply circuit is the increase of capacitor voltage, which leads to the short-circuit charging resistance of the relay's action contact. After testing the capacitors, it was found that the capacitor equipment was damaged under the action of high voltage, and there were signs of capacitor liquid leakage. In this case, the capacitor should be replaced with a new one for testing and normal operation can be restored.
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