| 摘要 |
<p>1,029,627. Semi-conductor limiter circuits. PYROTECTOR G.m.b.H. March 13, 1963 [March 15, 1962], No. 9995/63. Heading H3T. [Also in Divisions G3 and H2] A system wherein a reference control voltage is produced by a device such as a Zener diode is provided with means to compensate for imperfections in the device or variations in the applied voltage which means comprise the application to the device of a correcting voltage. A battery is charged from an A.C. supply by way of a transformer secondary winding L1, a controlled rectifier CR of any suitable type and contacts C1, C2 of a relay R which relay, when the supply fails, causes the battery B to be connected to auxiliary lamps B1, B2 by way of contacts C1, C3. Overcharging of the battery B is prevented by a circuit including a Zener diode ZD which is supplied from the secondary winding of the transformer T over a diode D so as to provide a bias voltage for the rectifier CR, the portion L2 of the secondary winding applying to the Zener diode ZD a voltage 180 degrees out of phase with the A.C. applied to the diode so as to correct for variations in the supply voltage or for imperfections in the Zener diode. A trickle charge circuit is provided by the diode D and a resistor R3.</p> |
