Taian inverter maintenance
Model: N2-2.2KW
Fault: no display
Fault analysis: open shell measurement inverter switching power supply, switching power supply design of N2 series inverter is the switching power supply is very popular, as with a piece of UC3842 waveform generator, adjusting switch K1317 duty cycle to adjust the output to. The whole circuit design is simple and reliable, and is widely used. However, due to the short circuit of the load of the switch power supply, or the switching power supply operating voltage, the switching power supply will be damaged. The problem is generally on the UC3842 chip, but if it is an external power supply, it is also possible to cause damage to the pulse transformer. Damage to the pulse transformer in N1 inverter in or more, but the cause and damage of N2 series inverter is different. The process is related to the winding process of pulse transformer. Measurements show that the switch K1317 to burn down the short circuit, replace the switch tube and UC3842 power measurement still did not show, the power oscillation voltage is normal, the static measurement found switch control pin resistance after burn, replacing all the normal electrical test.
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