Controller and a method for a DC converter, and also a DC converter

摘要

A controller (2) and a method for a DC converter (1), wherein the DC converter (1) comprises an input (E), an output (A), a connection to ground (GND), and also at least two half-bridges with two switching elements each (TR1 . . . TR4) connected in series and an inductance (L1, L2) each connected with the point connecting the two switching elements. In accordance with the invention the controller (2) is equipped to measure the current (IL1, IL2) through the inductances (L1, L2), and controls the switching elements (TR2, TR4)/(TR1, TR2) positions on the ground side/input side always with negative/positive current through the inductance (L1, L2) into an off-state. Finally a DC converter (1) connected with the controller (2) is also specified.

主权项

1. A DC converter comprising:
an input; an output; a ground connection; a first half-bridge, a first switch in said first half-bridge, a second switch connected in series following said first switch between said input and said ground connection, a first switch capacitor connected in parallel to said first switch, and a second switch capacitor connected in parallel to said second switch; a first inductor, said first inductor being electrically connected to a first half-bridge node point between said first and second switches, and said first inductor being electrically connected to said output; a second half-bridge in parallel to said first half-bridge, a third switch in said second half-bridge, a fourth switch connected in series following said third switch between said input and said ground connection, a third switch capacitor connected in parallel to said third switch, and a fourth switch capacitor connected in parallel to said fourth switch; a second inductor, said second inductor being electrically connected to a second half-bridge node point between said third and fourth switches, and said second inductor being electrically connected to said output; a capacitor connected between said output and said ground connection, and a second capacitor connected between said input and said ground connection; a controller connected to control said first half-bridge switch, said second half-bridge switch, said third half-bridge switch, and said fourth half-bridge switch; said controller electrically connected to obtain a first current measurement of current in said first inductor, said controller electrically connected to receive a second current measurement in said second inductor; said controller configured to switch said second half-bridge switch to an off-state when current in said first inductor is measured as flowing from said output towards said first inductor and measured as attaining a first specifiable threshold magnitude greater than zero, said controller configured to switch said fourth half-bridge switch to an off-state when current in said second inductor is measured as flowing from said output towards said second inductor and measured as attaining the first specifiable threshold magnitude; said controller configured to switch said first half-bridge switch to an off-state when current in said first inductor is measured as flowing from said first inductor towards said output and measured as attaining a second specifiable threshold magnitude greater than zero, said controller configured to switch said third half-bridge switch to an off-state when current in said second inductor is measured as flowing from said second inductor towards said output and measured as attaining the second specifiable threshold magnitude; said controller configured to set a first selectively adjustable time pause between switching-off of said first half-bridge switch and switching-on of said second half-bridge switch, said controller configured to set the first selectively adjustable time pause between switching-off of said third half-bridge switch and switching-on of said fourth half-bridge switch; and, said controller configured to set a second selectively adjustable time pause between switching-off of said second half-bridge switch and switching-on of said first half-bridge switch, said controller configured to set the second selectively adjustable time pause between switching-off of said fourth half-bridge switch and switching-on of said third half-bridge switch.