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Pulse Driver With Electronic Retriggerable Circuit Breaker

IP.com Disclosure Number: IPCOM000099232D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-14
Document File: 3 page(s) / 96K

Publishing Venue

IBM

Related People

Bonnet, Y: AUTHOR

Abstract

Disclosed is a circuit for sending voltage pulses a remote load. The circuit is self protected against and/or short circuit conditions applicable on the transmission line or on the load circuit itself.

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Pulse Driver With Electronic Retriggerable Circuit Breaker

       Disclosed is a circuit for sending voltage pulses a remote
load.  The circuit is self protected against and/or short circuit
conditions applicable on the transmission line or on the load circuit
itself.

      This circuit can be used in typical applications, such coil
drivers, remote powering and more generally wherever voltages and
high currents are required.

      This circuit is applicable to high voltage/high current where
current limiting is poorly adapted. Its current capability is
typically in the range of hundreds of milliamps, but can be easily
extendable.

      Within the devices characteristics, the breaking can be tuned
and/or digitally selected. In mode" (breaker open) insignificant
power is thus allowing this mode being operated without thermal
potential problem. The circuit self-retriggerable, meaning no
specific action, either or software driven, is necessary.

      The hereafter described circuit is of Positive type but can be
easily transformable in Negative (sink) driver.

      This circuit is based on a saturated Darlington switch Its
biasing is performed by a 22K resistor R22 tied +Vcc (Typ +48Vdc).
input of the switch is tied to Vin (e.g; +7Vdc to Its output feeds
the Driver Transistor Tdr through 10-ohm sensing resistor Rsns.

      Transistor T3 compares the output voltage at node B with
threshold voltage Vth generated from Vin through R68 and  As
explained hereafter, the value of Vth determines breaker threshold.
This value can be digitally selected means of grounded switches S1,
S2,...Sn.

      NORMAL OPERATION: Off state: biasing current generated by R22
flows through the junction of T1 (forward biased) to Vin. The of T2
is then equipotenti...