Ćuk based current source

摘要

Disclosed is a Ćuk based current source, a control circuit for a Ćuk based current source, and a method for providing a current.

主权项

1. A controlled current source, comprising:
an input terminal configured to receive an input voltage; an output terminal configured to have a load connected thereto; a reference terminal configured to have a reference potential applied thereto; a first inductive storage element and a switching element connected in series, a series circuit with the first inductive storage element and the a switching element being connected between the input terminal and the reference terminal; a second inductive storage element and a free-wheeling element connected in series, a series circuit with the second inductive storage element and the free-wheeling element being connected between the output terminal and the reference terminal; a capacitive storage element coupled between the first and second inductive storage element such that the first inductive storage element, the capacitive storage element and the second inductive storage element are connected in series between the input terminal and the output terminal; a first current measurement circuit comprising a current measurement output, the first current measurement circuit configured to measure one of a current through the switching element, through the free-wheeling element, or a sum of the currents through the switching element and the free-wheeling element to provide a first current measurement signal at the current measurement output that is dependent on the measured current; and a control circuit having an input coupled to the current measurement output of the current measurement circuit, the control circuit configured to:
generate a drive signal so as to have subsequent switching cycles, and to generate the drive signal so as to switch on the switching element for an on-time and to switch off the switching element for an off-time in each switching cycle, andsample the first current measurement signal at a sample time that is during at least one of the on-time and the off-time to obtain a discrete-time sample value in a first switching cycle, and to generate the drive signal for the switching element in a subsequent switching cycle dependent on the discrete-time sample value sampled during the first switching cycle.