Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1990-09-27
1992-05-05
Wong, Peter S.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323288, 363 16, 363124, G05F 146
Patent
active
051111330
ABSTRACT:
A converter circuit operable in a current control mode is disclosed. The circuit is of the type including an (1) inductor, (2) a clock for providing a clocking signal so that the circuit operates as a synchronous converter and (3) switching means, responsive to the clocking signal and a threshold current, for controlling the load voltage across the inductor between at least two different levels of voltage as a function of one or more supply voltages so that the inductor conducts (a) increasing inductor current for one level of load voltage from the beginning of each cycle of the clocking signal until the inductor current equals the threshold current during each cycle, and (b) decreasing inductor current for the other level of voltage from the time in each cycle the current equals the threshold current until the end of each said cycle. The threshold current is generated as a function of the load and supply voltages so that the slope and level of the threshold current is the desired steady state solution of the decreasing inductor current so that any perturbations of the inductor current immediately converges to the steady state solution at the time in each cycle the current equals the threshold current, and compensation is provided so that the average current passing through the inductor is substantially independent of the supply and load voltages.
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Unitrode Integrated Circuits of Merrimack, NH, "Modelling Analysis and Compensation of the Current-Mode Converter", U-97 (pp. 9-87 through 9-92) and U-100A (pp. 113-115).
Poulo Louis R.
Staley James G.
Analogic Corporation
Wong Peter S.
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