| 摘要 |
PURPOSE:To avoid the shift of horizontal position, by providing the thermo sensible element coupled thermally with the horizontal oscillation coil and transformer, feeding back this output to the phase control element of the phase detection circuit, and preventing the variation in the horizontal self running frequency due to temperature change. CONSTITUTION:IN the AFC circuit consiting of the phase detection circuit 1 inputting the horizontal synchronizing signal 11 of a TV receiver, LPF2, horizontal oscillation circuit 3 and horizontal deflection circuit 4, the heat sensible element 8 is coupled with the heat dissipating part of the horizontal oscillation coil and transistors of the oscillation circuit 3. Further, the output voltage from the heat sensible element 8 is fed to the transistor 5, the output of Tr5 is fed back to the phase control element of the phase detection circuit 1, the variation in the self running frequency due to temperature change of the horizontal oscillation coil and Tr of the oscillation circuit 3 is reduced to avoid the shift of horizontal position of picture. |
