Current control/power limited circuit

Details Current control/power limited circuit Current control/power limited circuit

G - Physics

05

F

G05F 1/46 (2006.01) G05F 1/573 (2006.01) G05F 1/575 (2006.01)

Patent

CA 2090501

89-747 -17- Abstract of the Disclosure An analog circuit provides selectable current control and power limiting for a connected load. A current control loop is combined with a voltage/power control loop to generate a current level signal via an output transistor to control current flow through a load. Current through a load is monitored with the current control loop maintaining current flow through the load at a selected value. If a selected power level is exceeded, the current is reduced by the voltage/power control loop. Voltage monitoring and feedback is used to control the operating power for a power level control operational amplifier and thereby maintain a selected power level. By providing multiple, voltage dependent gains in the voltage feedback loop, a piecewise linear approximation of a desired power curve can be obtained.

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