| 摘要 |
667,619. Saw-tooth generating circuits. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Feb. 24, 1950 [Feb. 28, 1949], No. 4810/50. Class 40 (vi). The invention relates to circuits of the type in which a saw-tooth current is generated in an output coil 5 connected to the secondary winding of a transformer, the primary winding of which is connected to a driver valve and in which the voltage across the secondary winding during the forward stroke is rectified by a rectifier 6 and applied to the output circuit of the valve. According to the invention greater efficiency is obtained by maintaining the grid voltage at a steady value between the periodic negative pulses which cut off the valve and initiate the flyback. The desired grid waveform may be obtained from a separate source or may be obtained from the secondary winding through a capacitor 11 and a resistor 12, adjustment of which resistor varies the frequency of operation. The output transformer preferably has a ratio of 1 : 1. |
