Constant power circuit

Details Constant power circuit Constant power circuit

1989-10-05

1992-02-11

Stephan, Steven L.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323274, 323275, 3232931, 361 18, 361 26, 361 87, H02M 326

Patent

active

050878700

ABSTRACT:
A constant power circuit for causing a constant power level to be dissipated by a load when an overpower condition is detected. The overpower condition is detected by measuring the voltage across and current drawn by the load in accordance with a programmed load value and determining whether the sum of the measured current and voltage exceeds the power limit for the load. In a preferred embodiment, the sum of the voltage and current is compared to a linear piecewise approximation of a constant power curve in the current-voltage plane, the curve representing the power limit for the load for the range of current and voltage magnitudes in which the load circuit may safely operate. When an overpower condition is detected, the power is dissipated by the load at a constant power level defined by the constant power limit by oscillating the power level within a hysteresis band about the constant power limit. The hysteresis effect prevents the power level dissipated by the load from dropping much below the constant power limit of the load. The output of a power stage is then driven to follow the oscillating output power level until the overpower condition is no longer detected. In this manner, the load may receive a constant power level which is independent of the impedance of the power source driving the load.

REFERENCES:
patent: 4404472 (1983-09-01), Steigerwald
patent: 4678983 (1987-07-01), Rouzies
patent: 4837653 (1989-06-01), Yip
patent: 4899269 (1990-02-01), Rouzies

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