| 摘要 |
1,195,721. Automatic voltage control. JOSEPH LUCAS (INDUSTRIES) Ltd. Dec. 22, 1967 [Jan.16, 1967], No.2185/67. Heading G3R. [Also in Division B3] A regulator for use with an alternator on a road vehicle provides power through a full wave rectifier to a battery having a positive terminal 12 and a negative terminal connected to an earthed line 13, the alternator also supplying power through one or more auxiliary diodes to a positive supply line 11. When the battery voltage is below a predetermined value, a Zener diode is non- c6nductive and so no base current flows through a transistor 19. Current flowing through a resistor 21 turns on a transistor 22 and current flows in the field winding 23. When the predetermined voltage is reached, the Zener diode 17 conducts to provide base current to the transistor 19, which removes the base current from the transistor 22. By means of the feedback connection through resistor 25 and capacitor 26 the circuit oscillates with transistors 19, 22 alternately conductive, the mark-space ratio being determined by the current flowing through the Zener diode 17, which in turn is determined by the battery voltage. The arrangement is such that the mean current flow in the winding 23 maintains the battery voltage substantially constant. The method of manufacturing the regulator is described, Figs. 2 and 3 (not shown). |
