Abstract: A bidirectional power converter includes flyback converter units connected in parallel, each having a controller and adapted to accumulate power from a primary side during an ON time and to deliver the accumulated power to a secondary side during an OFF time, the primary and secondary sides being interchangeable as to the direction of power conversion, the controller operating at a boundary between discontinuous and continuous conduction modes and performing valley switching when switching from OFF to ON, one converter unit operating as a master wherein the controller is adapted to control the length of ON time in order to feedback-control an overall current output of the converter, and each other converter unit operating as a slave wherein the controller controls the length of ON time in order to feedback-control a phase delay of ON time of the slave relative to ON time of another converter unit.
Type:
Grant
Filed:
January 27, 2020
Date of Patent:
October 17, 2023
Assignee:
Power Research Electronics B.V.
Inventors:
Mike Van Den Heuvel, Jacobes Harmen Schijffelen, Gautham Ram Chandra Mouli, Dolf Henricus Jozef Van Casteren
Abstract: An LED driver circuit includes at least one string (10) of LEDs (12) connected in series, and a power supply for converting a mains voltage (AC) into an output voltage (Uout) to be applied to the at least one string (10) of LEDs, in which the power supply includes a single-stage boost converter (14) adapted to directly convert the mains voltage (AC) into the output voltage (Uout).
Type:
Grant
Filed:
March 4, 2014
Date of Patent:
November 15, 2016
Assignee:
Power Research Electronics B.V.
Inventors:
Jos H. Schijffelen, Menno Kardolus, Mark Gröninger, Dolf van Casteren
Abstract: A power converter includes a DC input (26) connected to an inductive element (TR), a switch (T1) arranged to interrupt the inductive current cyclically with a predetermined cycle period, a plurality of load circuits (31, 32, 33), and a multiplexer (36) having a plurality of parallel channels (M1, M2, M3) between first and second output terminals (34, 38) of the inductive element (TR), wherein each channel includes one of the load circuits (31, 32, 33), and the multiplexer is adapted to make the channels conductive sequentially and periodically, and the multiplexer has a switching period that is a multiple of the predetermined cycle period of the switch (T1).
Type:
Grant
Filed:
April 25, 2008
Date of Patent:
January 21, 2014
Assignee:
Power Research Electronics B.V.
Inventors:
Jan Wanner, Menno Kardolus, Jos H. Schijffelen
Abstract: A power converter includes a DC input (26) connected to an inductive element (TR), a switch (T1) arranged to interrupt the inductive current cyclically with a predetermined cycle period, a plurality of load circuits (31, 32, 33), and a multiplexer (36) having a plurality of parallel channels (M1, M2, M3) between first and second output terminals (34, 38) of the inductive element (TR), wherein each channel includes one of the load circuits (31, 32, 33), and the multiplexer is adapted to make the channels conductive sequentially and periodically, and the multiplexer has a switching period that is a multiple of the predetermined cycle period of the switch (T1).
Type:
Application
Filed:
April 25, 2008
Publication date:
October 27, 2011
Applicant:
POWER RESEARCH ELECTRONICS B.V.
Inventors:
Jan Wanner, Menno Kardolus, J.H. Schijffelen