Voltage stabiliser for l.v. DC networks, especially in cars - has electrolytic capacitor in series with resistor and diode to ensure correct polarity with time delay switch

摘要

A device for stabilising the voltage on l.v. DC networks with consumers of variable current demand uses filter capacitors of high capacitance. A resistance limiting the initial charging current and a diode ensuring the correct polarity are connected in front of an electrolytic capacitor. The resistance and diode can be short-circuited after a certain time delay by means of a switch following charging of the correct polarity. Parallel to the electrolytic capacitor is at least one non-electrolytic capacitor of low capacitance and also a peak-topping Zener diode. Across the electrolytic capacitor and the rectifier is connected an LED which illuminates when the polarity of the connection is incorrect. ADVANTAGE - Easy to assemble, ensures long life for the electrolytic capacitors and suffers no damage from incorrect polarity.