| 摘要 |
<p>1,265,156. Automatic voltage control. JOSEPH LUCAS (INDUSTRIES) Ltd. July 1, 1969 [Aug. 1, 1968], No.36718/68. Heading G3R. A voltage regulator for the alternator rectifier unit (not shown) of a road vehicle comprises a transistor T3 in series with the field winding of the alternator, a transistor Tl responsive to a circuit R1, R2, 13 sensing the battery voltage, an intermediate transistor T2 and a feedback circuit C1, R7, the regulator operating in the conventional on/off oscillatory manner to maintain the battery voltage at a value determined by the setting of the adjustable resistor R2. The capacitor C2 acts to minimize radio interference but, since the circuit shown is designed for use with planar transistors, it is difficult to use a capacitor C2 of sufficiently high value to completely prevent interference. The problem is overcome by provision of the members R8, R9, C3 connected as shown. A warning lamp (not shown) is provided and the values of resistors R1, R3 and the base-emitter characteristic of the transistor T1 are chosen to produce automatic temperature compensation. In a modification the emitter of transistor T2 is connected to the line 12.</p> |
