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Protective Circuit Disclosure Number: IPCOM000041945D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03

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Abramson, P Stammely, TE [+details]


This article discloses a circuit arrangement for monitoring the output signal from a power supply and to inhibit the output signal if the signal falls outside a predetermined range. The circuit uses two comparators and a resistor divider network to control a transistor switch. The output signal from the transistor switch represents the signal from the power supply. With reference to the drawing, resistor R1 and zener diode D1 are connected in series to a power supply VCC . The series combination forms a reference voltage Vref at node N1. Vref is connected to the positive input and negative inputs of C1 and C2, respectively. A resistive network comprised of R2, R3 and R4 forms two voltages fed to C1 and C2 for comparison with Vref .