| 摘要 |
PROBLEM TO BE SOLVED: To provide the switching system vertical deflection output circuit in which disturbance of vertical deflection output waveform is not caused at a switching time from a blanking period to a scanning period even when a pop up circuit is added. SOLUTION: A comparator 6 compares an error voltage from an error amplifier 2 received at its noninverting input terminal with a +V1(V) from a DC voltage source E2 fed to its inverting input terminal and provides an output of the result from its output terminal as a tentative pup up pulse D. The pulse D is fed to one input terminal of an OR circuit 8 and fed to a monostable multivibrator (M.M)7, from which a pulse E with a prescribed width t1 from its trailing ridge is generated and outputted to other input terminal of the OR circuit 8. The OR circuit 8 receiving the pulses D, E ORs them and provides an output of a pulse F to a switch circuit 11. |
