Fault phenomenon; a normal use of the inverter, power failure after the conventional cleaning and maintenance, the power supply immediately jumps to the main circuit switch, immediately continue to send power, the inverter is also normal. After the second power failure maintenance, this phenomenon is still the same, the first time you can not send power, the second time can be used normally.
Analysis of the cause: After the main circuit rectifier bridge of the inverter, there is a current limiting resistor. The function is to charge the DC circuit to the current of the DC power supply to the filter capacitor within a certain period of time after the inverter is powered. Protect the rectifier bridge. There is a short-circuit switch at both ends of the current limiting resistor. When the capacitor is charged to a certain degree, the switch closes to short-circuit the current limiting resistor, and the circuit is put into normal operation. If the short-circuit switch is normally closed, the power is turned on. The DC power supply directly charges the filter capacitor, which is equivalent to the instantaneous short-circuit of the output end of the DC bridge, forming a large inrush current to trip the power switch, and immediately re-powering due to the existing power in the capacitor, the current does not cause too much jump The inverter can also operate normally. If this situation is not handled in time, it will cause serious damage to the rectifier bridge.
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