| 摘要 |
<p>708,214. Saw-tooth generating circuits. EDISON SWAN ELECTRIC CO., Ltd. June 18, 1952 [June 21, 1951], No. 15386/52. Class 40 (6). [Also in Group XXXV] A saw tooth wave generator comprises a spacecharge grid valve feeding an inductive load through a transformer and the secondary winding of the transformer applies a voltage to the space charge grid which is positive during the scan to damp spurious oscillations and negative during the flyback to cut off the anode current. A saw tooth wave is applied from a blocking oscillator (not shown) to the control grid 17 of a valve 14. The output of this valve is fed through a transformer to a point 26 connected to the scanning coils of a television receiver. This point, which is positive during the scan and negative during the flyback is connected to a space charge grid 16 to increase the current during the scan and to assist in cutting off the current during the flyback. The current through a space charge grid serves to damp out oscillations initiated during the flyback and charges a capacitor 29 which may supply I-F or other valves with H.T. current. Negative feedback is also effective at the spacecharge grid since if the voltage across the scanning coils rises the space-charge grid voltage rises and collects more current causing the anode current to fall. Specification 667,521, [Group XXXV], is referred to.</p> |
