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US 6,285,171 B1Granted
DC-DC converter
AssigneeU.S. Philips Corporation
InventorsJohannes Hendrik Wessels, Wilhelmus Hunderikus Maria Langeslag
Life of this patent
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Abstract
In an up-converter comprising two parallel switching elements, the total current through these switching elements is measured using a current sensor consisting of four ohmic resistances, and said total current is controlled so as to be at a constant level. The power dissipation in the current sensor and in the switching elements can be kept at a low level.
Claims3
A DC-DC converter comprising
- input terminals for connecting it to a supply-voltage source,
- a first branch, coupled to one of the input terminals, which includes a series arrangement of an inductive element and a unidirectional element,
- switching means comprising at least two switching elements, each switching element forming part of a switching branch which includes a series arrangement of the switching element and an impedance, said switching branch being connected with a first end to a point between the inductive element and the unidirectional element, and with a second end to one of the input terminals,
- a control circuit coupled to control electrodes of the switching elements for rendering the switching means alternately conducting and non-conducting,
- a current sensor provided with an output coupled to the control circuit for generating a signal which, during operation, is present at the output and which is a measure of a current through the switching means,
- characterized in that each one of the impedances in the switching branches is connected to the output of the current sensor via a signal branch, and the current sensor comprises the impedances in the switching branches and the signal branches.
3 more elements
Dependencies are inferred from the claim text.