G - Physics – 05 – F
Patent
G - Physics
05
F
323/4
G05F 1/56 (2006.01) G05F 1/595 (2006.01) G05F 1/613 (2006.01)
Patent
CA 1178335
ABSTRACT Disclosed is a DC power supply comprising a pre-regulator having an input connected to a DC supply, a control terminal connected to a reference voltage and an output connected to an input of a three terminal integrated circuit (IC) voltage regulator. The IC regulator has an output terminal for connection to a load and an adjustment terminal connected to a bias voltage, a zener diode being connected between the control terminal and the output of the IC regulator and between the input and output of the IC regulator. The zener diode has a breakdown voltage less than a maximum permissible input- output voltage differential for the IC regulator whereby an excessive load demand tending to increase the input voltage to the IC regulator causes the zener diode to conduct and reduce the voltage on the control terminal of the pre-regulator which thereupon decreases the voltage to the input of the IC regulator.
411556
Fetherstonhaugh & Co.
Pylon Electronic Development Company Ltd.
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