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E54 display circuit analysis

  • 2014-03-05
  • 316.81KB
  • Points it Requires : 2

The DC voltage 110V rectified by the rectifier bridge is rectified by D906, passed through R911, R912, and then filtered by C911 to UC3842\'s ⑦ pin. When the voltage of ⑦ pin is between 16V-34V, UC3842 starts to work. At this time, ⑧ pin has a 5V reference voltage, and ⑥ pin outputs a pulse to turn on the switch tube Q901. At this time, the primary coil (4-6) of the transformer generates current and generates induced electromotive force. According to the principle of mutual inductance, the primary coil (1-2) also generates an induced voltage, which is rectified by R913, D910 and filtered by C911 to power UC3842\'s ⑦ pin...

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