Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Patent
1997-06-20
2000-03-14
Sterrett, Jeffrey
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
323285, G05F 1613
Patent
active
060377542
ABSTRACT:
A switched mode power supply circuit is provided that converts an input DC or AC voltage to a constant DC output voltage. The circuit uses a combination of a switch and an inductor at the output stage. When the switch is open, a current through the inductor decreases linearly until it reaches zero. Then the switch is closed, and the inductor current increases linearly until it reaches an upper limit, at which time the switch is opened, and the inductor current starts decreasing again. The upper limit of the inductor current is computed by a support circuit, and thus it does not need to be provided by sensing the input voltage independently. The computation uses the durations ratio D of a recent fall time duration of the inductor current divided by a recent rise time duration of the inductor current. The maximum inductor current is computed by multiplying a constant current value by D.times.(1+D). The result is a circuit with resistive only input impedance. The computation is further adapted to account for changes in the actual output voltage with changing load conditions. A fast reacting circuit reduces the computed maximum inductor current to nearly zero, if an overvoltage load condition is detected. A slow reacting circuit adjusts the computed maximum inductor current continuously to maintain the output voltage equal to a nominal output voltage. An efficient analog computation circuit is disclosed for performing the computation, and for adjusting for changes in the load conditions.
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Anderson Edward B.
Harper Raymond G.
Kavounas Gregory T.
Sterrett Jeffrey
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