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Z-ARCHIVE-Energy Storage: Bidirectional Direct Current Converters
Search All Applications in Z-ARCHIVE-Energy Storage: Bidirectional Direct Current Converters
Application US20190157979
Published 2019-05-23
Parallel Power Supply Device
A parallel power supply device includes a plurality of DC/DC converters connected in parallel, and each DC/DC converter includes: first and second switching circuits with a transformer therebetween; first and second reactors; and a control circuit. The control circuit generates a duty cycle so that a deviation between voltage of a load and target voltage becomes 0. Correction is performed such that, when the magnitude of the duty cycle is smaller than a set value Vth, the magnitude is fixed at 0, and otherwise, the magnitude is decreased by the set value Vth. Then, the phase shift amounts for drive signals for the first and second switching circuits are determined, and the first and second switching circuits are subjected to phase shift control.
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USPTO Full Text Publication >
- 1. A parallel power supply device in which a plurality of DC/DC converters each performing bidirectional power transmission are connected in parallel to supply power to a common load, each DC/DC converter comprising:
a transformer; a first switching circuit configured to be a full-bridge circuit with two bridge circuits having a plurality of semiconductor switching elements to which diodes are respectively connected in antiparallel, the first switching circuit being connected between the common load and a first winding of the transformer and performing power conversion between DC and AC; a second switching circuit configured to be a full-bridge circuit with two bridge circuits having a plurality of semiconductor switching elements to which diodes are respectively connected in antiparallel, the second switching circuit being connected between a DC power supply and a second winding of the transformer and performing power conversion between DC and AC; a first reactor and a second reactor connected to AC input/output lines of the first switching circuit and the second switching circuit, respectively; and a control circuit for controlling the first switching circuit and the second switching circuit, wherein each control circuit includes a voltage control unit having a compensator and generating a duty cycle so that a deviation between voltage of the common load and target voltage becomes 0, and on the basis of the duty cycle, the control circuit determines first and second phase shift amounts for drive signals for the first and second switching circuits, to control the first and second switching circuits, and each control circuit uses the duty cycle corrected such that, when a magnitude of the duty cycle generated by the voltage control unit is smaller than a set value, the magnitude is fixed at 0, and otherwise, the magnitude is decreased by the set value.
