H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/27, 323/4
H02M 3/155 (2006.01) G01R 1/28 (2006.01) G01R 17/06 (2006.01) G01R 17/10 (2006.01) H02M 3/156 (2006.01)
Patent
CA 1154088
D22,469 CURRENT SENSING CIRCUIT FOR POWER SUPPLY WITH SERIES CONTROL TRANSISTOR by Robert G. Rogers ABSTRACT OF DISCLOSURE A -DC to +DC voltage converter having one input and one output terminal connected to ground and regulator circuitry responsive to a control voltage for regulating the magnitude of output current delivered to a load impedance connected across the output terminals. Apparatus producing the control voltage comprises a passive resistive bridge circuit having one pair of nodes connected between the other input and other output terminals and a current sensing resistor in one arm of the bridge so as to pass load current to the other output terminal, a difference voltage that is the control voltage being developed between the second pair of nodes of the bridge. In one embodiment, the bridge comprises a potentiometer having a moveable contact connected to the other input terminal, and first and second pairs of series connected resistors connected between opposite sides of the potentiometer and opposite sides of the current sensing resistor. The potentiometer is adjusted to make the difference voltage between junctions of resistors of the pairs thereof a desired value for a prescribed maximum load current in the current sensing resistor. In an alternate embodiment that is also responsive to input current, the potentiometer is replaced by a fixed resistor connected to the other input terminal and having opposite sides thereof connected to ends of associated series connected resistors, one of the other resistors being variable for adjusting the bridge.
360643
Gte Automatic Electric Incorporated
R. William Wray & Associates
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