| 摘要 |
PURPOSE:To detect the current signal of an automatic luminance limiter by providing a detecting circuit consisting of a capacitor and a resistance to the low-voltage side terminal of the secondary widning of a flyback transformer with a diode between. CONSTITUTION:The detecting circuit 26 consists of the capacitor 27 connected with a reverse-current stopping diode 25 between and the resistance 28 connected between the output terminal of a DC power source 19 and the capacitor 27 is connected to the secondary winding low-voltage side 16 of the flyback transformer 14. In this case, anode current variation on the low voltage side 16 appears as variation in the primary current of the transformer 14, and this variation in the primary current is detected by the resistance 28. Further, the reverse-current stopping diode is connected to the resistance 28, so variation in the current of the automatic luminance limiter is detected without any influence of flyback pulses VP2. |
