Patents by Inventor Nils Backman
Nils Backman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11223294Abstract: The present disclosure provides to a power converter including an AC input terminal (ACin), a neutral terminal (N), an AC output terminal (ACout), an AC/DC converter circuit (210) connected between the AC input terminal, a positive DC terminal (DCP), and a negative DC terminal (DCN), a DC capacitor (C15) connected between the positive DC terminal (DCP) and the negative DC terminal (DCN), a line frequency commutated neutral circuit (220) connected between the positive DC terminal (DCP), the negative DC terminal (DCN), and the neutral terminal (N), and a DC/AC converter circuit (230) connected between the positive DC terminal (DCP), the negative DC terminal (DCN), the AC output terminal (ACout), and the neutral terminal (N). The power converter further includes an auxiliary converter circuit (240) connected between the positive DC terminal (DCP), the negative DC terminal (DCN), and the neutral terminal (N).Type: GrantFiled: December 20, 2019Date of Patent: January 11, 2022Assignee: ELTEK ASInventors: Nils Backman, Roberto Rojas
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Patent number: 11043900Abstract: The present disclosure relates to a DC-DC converter (10), comprising a first DC port (10A) connectable to a DC source (B), a second DC port (10B) with a positive terminal (PT), a midpoint terminal (MT) and a negative terminal (NT) connectable to a DC bus (4). A first capacitor (C1) is connected between the positive terminal (PT) and the midpoint terminal (MT) and a second capacitor (C2) is connected between the midpoint terminal (MT) and the negative terminal (NT). The DC-DC converter (10) comprises a first switching circuit (20), a second switching circuit (40) and a resonant circuit (30) connected between the first switching circuit (20) and the second switching circuit (40). The second switching circuit (40) comprises a first switch (Q1), a second switch (Q2), a third switch (Q3), and a fourth switch (Q4).Type: GrantFiled: March 13, 2020Date of Patent: June 22, 2021Assignee: ELTEK ASInventor: Nils Backman
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Publication number: 20200220466Abstract: The present disclosure relates to a DC-DC converter (10), comprising a first DC port (10A) connectable to a DC source (B), a second DC port (10B) with a positive terminal (PT), a midpoint terminal (MT) and a negative terminal (NT) connectable to a DC bus (4). A first capacitor (C1) is connected between the positive terminal (PT) and the midpoint terminal (MT) and a second capacitor (C2) is connected between the midpoint terminal (MT) and the negative terminal (NT). The DC-DC converter (10) comprises a first switching circuit (20), a second switching circuit (40) and a resonant circuit (30) connected between the first switching circuit (20) and the second switching circuit (40). The second switching circuit (40) comprises a first switch (Q1), a second switch (Q2), a third switch (Q3), and a fourth switch (Q4).Type: ApplicationFiled: March 13, 2020Publication date: July 9, 2020Inventor: NILS BACKMAN
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Publication number: 20200204081Abstract: The present disclosure provides to a power converter including an AC input terminal (ACin), a neutral terminal (N), an AC output terminal (ACout), an AC/DC converter circuit (210) connected between the AC input terminal, a positive DC terminal (DCP), and a negative DC terminal (DCN), a DC capacitor (C15) connected between the positive DC terminal (DCP) and the negative DC terminal (DCN), a line frequency commutated neutral circuit (220) connected between the positive DC terminal (DCP), the negative DC terminal (DCN), and the neutral terminal (N), and a DC/AC converter circuit (230) connected between the positive DC terminal (DCP), the negative DC terminal (DCN), the AC output terminal (ACout), and the neutral terminal (N). The power converter further includes an auxiliary converter circuit (240) connected between the positive DC terminal (DCP), the negative DC terminal (DCN), and the neutral terminal (N).Type: ApplicationFiled: December 20, 2019Publication date: June 25, 2020Inventors: NILS BACKMAN, ROBERTO ROJAS
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Patent number: 10396560Abstract: An electric multimode power converter module includes an AC/DC converter, including a first AC port; a DC/AC converter, including a second AC port; a DC/DC converter, including a DC port; a controller; and a communication bus interconnecting the converters. The controller includes a hardware configuration port and sets the module in the following states, based on the value read from the configuration port: a first state in which the module transfers power between the first AC port and the DC port, a second state in which the module transfers power between the DC port and the second AC port, and a third state in which the module transfers power between the AC ports and the DC port. A power supply system includes a shelf device including at least one compartment, and an electric multimode power converter module as mentioned above is inserted in the at least one compartment.Type: GrantFiled: April 8, 2015Date of Patent: August 27, 2019Assignee: Eltek ASInventors: Johan Svedendahl, Nils Bäckman, Sylvain Chatelet, Roberto Rojas
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Patent number: 9692315Abstract: An AC-AC converter device includes first and second AC input terminals and first and second AC output terminals. An input device is connected between an input node, a common node, a positive DC terminal and a negative DC terminal, wherein the input node is connected to the first AC input terminal via a first input inductor. An output device is connected between an output node, the positive DC terminal and the negative DC terminal, wherein the output node is connected to the first AC output terminal via an output inductor. A common device is connected between the common node, the positive DC terminal and the negative DC terminal, where the common node is connected to the second AC input terminal via a common inductor. A control device is provided for controlling the switches of the output device and the common device.Type: GrantFiled: January 7, 2014Date of Patent: June 27, 2017Assignee: Eltek ASInventors: Nils Bäckman, Roberto Rojas
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Publication number: 20170117709Abstract: An electric multimode power converter module includes an AC/DC converter, including a first AC port; a DC/AC converter, including a second AC port; a DC/DC converter, including a DC port; a controller; and a communication bus interconnecting the converters. The controller includes a hardware configuration port and sets the module in the following states, based on the value read from the configuration port: a first state in which the module transfers power between the first AC port and the DC port, a second state in which the module transfers power between the DC port and the second AC port, and a third state in which the module transfers power between the AC ports and the DC port. A power supply system includes a shelf device including at least one compartment, and an electric multimode power converter module as mentioned above is inserted in the at least one compartment.Type: ApplicationFiled: April 8, 2015Publication date: April 27, 2017Applicant: ELTEK ASInventors: Johan Svedendahl, Nils Bäckman, Sylvain Chatelet, Roberto Rojas
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Publication number: 20150381070Abstract: An AC-AC converter device includes first and second AC input terminals and first and second AC output terminals. An input device is connected between an input node, a common node, a positive DC terminal and a negative DC terminal, wherein the input node is connected to the first AC input terminal via a first input inductor. An output device is connected between an output node, the positive DC terminal and the negative DC terminal, wherein the output node is connected to the first AC output terminal via an output inductor. A common device is connected between the common node, the positive DC terminal and the negative DC terminal, where the common node is connected to the second AC input terminal via a common inductor. A control device is provided for controlling the switches of the output device and the common device.Type: ApplicationFiled: January 7, 2014Publication date: December 31, 2015Applicant: ELTEK ASInventors: Nils Bäckman, Roberto Rojas
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Patent number: 8593831Abstract: The invention relates to a method for controlling a series resonant DC/DC converter. The method comprises the steps of: defining a switching period TP having a first half period TA and a second half period TB and defining a subsequent switching period TP+1 after the switching period TP. In a next step, a first set (S1sc1; S1sc1, S4sc1) of switches of a first switching circuit (SC1) is controlled to be ON from the beginning Tstart of the first half period TA minus a time interval ?TAE1, where the time interval ?TAE1 is provided at the end of the first half period TA and a second set (S2sc1; S2sc1, S3sc1) of switches of the first switching circuit (SC1) is controlled to be ON from the beginning Tcenter of the second half period TB minus a time interval ?TBE1, where the time interval ?TBE1 is provided at the end of the second half period TB.Type: GrantFiled: October 25, 2011Date of Patent: November 26, 2013Assignee: Eltek Valere ASInventors: Roberto Rojas, Nils Backman
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Publication number: 20130208512Abstract: The invention relates to a method for controlling a series resonant DC/DC converter. The method comprises the steps of: defining a switching period TP having a first half period TA and a second half period TB and defining a subsequent switching period TP+1 after the switching period TP. In a next step, a first set (S1sc1; S1sc1, S4sc1) of switches of a first switching circuit (SC1) is controlled to be ON from the beginning Tstart of the first half period TA minus a time interval ?TAE1, where the time interval ?TAE1 is provided at the end of the first half period TA and a second set (S2sc1; S2sc1, S3sc1) of switches of the first switching circuit (SC1) is controlled to be ON from the beginning Tcenter of the second half period TB minus a time interval ?TBE1, where the time interval ?TBE1 is provided at the end of the second half period TB.Type: ApplicationFiled: October 25, 2011Publication date: August 15, 2013Inventors: Roberto Rojas, Nils Backman
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Patent number: 6518739Abstract: A new ZVS (zero-voltage-switching) snubber circuit suitable for high power boost converters used as power factor correction circuits used in AC-to-DC modules. The ZVS circuit comprises a main switch, an auxiliary switch, a load circuit, a reset circuit, a first diode, a blocking diode, and a first capacitor. The switches and the capacitor are connected in parallel. The circuit includes a blocking diode having an anode terminal connected to a drain terminal of the auxiliary switch and a cathode terminal connected to the reset circuit. At turn-off, the current tail of the main switch is taken over by the auxiliary switch. The ZVS circuit keeps the collector-emitter voltage of main switch almost zero, so that the turn-off loss is minimized.Type: GrantFiled: March 26, 2002Date of Patent: February 11, 2003Assignee: Emerson Energy Systems ABInventors: Roland Wald, Nils Bäckman
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Publication number: 20020118003Abstract: A new ZVS (zero-voltage-switching) snubber circuit (500) suitable for high power boost converters used as Power Factor Correction circuits used in AC-to-DC modules. The ZVS circuit comprising a main switch (S), an auxiliary switch (S1), a load circuit (LD) a reset circuit (RC), a first diode (D1), a blocking diode (d2), and a first capacitor (C1). The switches and the capacitor are connected in parallel. The circuit having an anode terminal (a2) of a blocking diode (D2) being connected to a drain terminal (d1) of the auxiliary switch and that a cathode terminal (k2) being connected to the reset circuit. At turn-off, the current tail of the main switch is taken over by the auxiliary switch. The ZVS circuit keeps the collector-emitter voltage of main switch almost zero, so that the turn-off loss is minimized.Type: ApplicationFiled: March 26, 2002Publication date: August 29, 2002Inventors: Roland Wald, Nils Backman