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公开(公告)号：US10998824B2
公开(公告)日：2021-05-04
申请号：US16078148
申请日：2016-12-19
摘要： A power conversion device includes M number of DC/DC converters, first-side terminals of the DC/DC converters are connected so that common current flows between both positive and negative terminals of first DC terminals of the power conversion device, and second-side terminals thereof are connected so that common current flows between both positive and negative terminals of second DC terminals of the power conversion device. The power conversion device further includes M-1 number of auxiliary converters each connected between two DC/DC converters and performing DC/DC conversion. The DC/DC converters control voltages of the second-side terminals and input voltage of the power conversion device. Each auxiliary converter controls voltages of the first-side terminals of the two DC/DC converters so as to be equalized.
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公开(公告)号：US11316433B2
公开(公告)日：2022-04-26
申请号：US16965411
申请日：2018-03-02
摘要： A power conversion device includes a first bridge circuit, a second bridge circuit, and an inductance element connected between a first AC terminal of the first bridge circuit and a second AC terminal of the second bridge circuit. The controller calculates a passing current passing through the inductance element based on a difference between a first alternating current flowing between the first AC terminal and the inductance element and a second alternating current flowing between the second AC terminal and the inductance element, and detects a first DC component included in the passing current. The controller changes a duty in at least one of the first AC voltage and the second AC voltage to cancel the detected first DC component, the duty being a ratio of a positive potential period and a negative potential period.
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公开(公告)号：US10432101B2
公开(公告)日：2019-10-01
申请号：US16307103
申请日：2017-06-14
摘要： A first bridge circuit includes a first leg and a second leg. The first leg includes an upper arm and a lower arm. The upper arm includes a plurality of switching devices connected in series, a plurality of freewheeling diodes connected in antiparallel with the switching devices, respectively, and a plurality of snubber capacitors connected in parallel with the switching devices, respectively. A control circuit controls the first and second bridge circuits such that a dead time period is provided between a turn-on period of an upper arm and a turn-on period of a lower arm included in each of the first and second legs, in each of the first and second bridge circuits.
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公开(公告)号：US12021440B2
公开(公告)日：2024-06-25
申请号：US17299783
申请日：2019-01-21
CPC分类号： H02M1/008 , H02M1/0058 , H02M1/007 , H02M3/33573 , H02M3/33584
摘要： A multiwinding transformer includes a primary-side winding and a plurality of secondary-side windings. A primary-side bridge circuit is connected between a primary-side DC terminal and the primary-side winding. A plurality of secondary-side bridge circuits are connected between the plurality of secondary-side windings and a plurality of secondary-side DC terminals, respectively. A switching converter variably controls a first DC voltage of the primary-side DC terminal or a second DC voltage of a first secondary-side DC terminal among the plurality of secondary-side DC terminals such that a voltage ratio between the first DC voltage and the second DC voltage is controlled to a constant ratio in accordance with a turns ratio between the primary-side winding and the secondary-side winding corresponding to the first secondary-side DC terminal among the plurality of secondary-side windings.
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公开(公告)号：US11855445B2
公开(公告)日：2023-12-26
申请号：US17599586
申请日：2019-07-11
CPC分类号： H02H7/1257 , H02H7/1213 , H02J1/102 , H02H3/063 , H02H3/087 , H02M1/0077
摘要： Even when one power conversion device among a plurality of power conversion devices connected in parallel experiences a short circuit, the other power conversion devices having experienced no short circuit can be promptly restarted. Each power conversion device includes: a short circuit occurrence determination unit configured to determine, on the basis of a current value at an output terminal, whether or not a short circuit has occurred; a short circuit elimination determination unit configured to determine, on the basis of a current value and a voltage value at the output terminal, whether or not the short circuit has been eliminated; and a current interruption unit configured to, on the basis of determination by the short circuit occurrence determination unit and determination by the short circuit elimination determination unit, interrupt current that flows from a power conversion unit to the output terminal or cancel the interruption.
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公开(公告)号：US11532990B2
公开(公告)日：2022-12-20
申请号：US16973778
申请日：2019-07-31
摘要： In a start-up control in which primary-side direct-current (DC) terminals and secondary-side DC terminals are charged by an external power supply outside a power conversion device, initially, one-side DC terminals are charged by the external power supply while switching operations of the primary-side bridge circuit and the secondary-side bridge circuit are stopped. Subsequently, a bridge circuit that is connected to the DC terminals not charged by the external power supply stops the switching operation and operates in a diode rectifying mode, while a bridge circuit that is connected to the DC terminals charged by the external power supply performs the switching operation and outputs an AC voltage whose voltage pulse width has been subjected to a variable control so that the voltage pulse width is smaller for a greater voltage difference of the charged DC terminals from the uncharged DC terminals.
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公开(公告)号：US11428748B2
公开(公告)日：2022-08-30
申请号：US16649798
申请日：2018-06-11
摘要： A power conversion device which is a test target performs DC voltage conversion between a primary side DC terminal and a secondary side DC terminal. A first connection member electrically connects a testing power supply and the primary side DC terminal serving as an input side of the test target. A second connection member electrically connects the primary side DC terminal and the secondary side DC terminal of the power conversion device to transmit active power output from the secondary side DC terminal to the primary side DC terminal to be a part of active power input to the primary side DC terminal.
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公开(公告)号：US11515778B2
公开(公告)日：2022-11-29
申请号：US17047698
申请日：2018-05-16
摘要： Provided is a power conversion device capable of continuing the transmission of power even in the event of failure of a DC-to-DC converter cell. The power conversion device according to the present invention includes: a unit having a plurality of DC-to-DC converter cells; a short-circuit device that short-circuits a failed cell; and a control circuit that controls the plurality of DC-to-DC converter cells. The control circuit controls the voltage of a second cell terminal of a healthy cell included in a unit that includes the failed cell, based on a failed cell count m, so that the power of a first cell terminal and the power of the second cell terminal are matched.
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公开(公告)号：US11038432B2
公开(公告)日：2021-06-15
申请号：US16616007
申请日：2018-04-09
摘要： Provided is a power conversion device including a power converter for performing power conversion between primary-side DC voltage and secondary-side DC voltage, and a control device for controlling the power converter in accordance with a command value, wherein the control device generates a primary-side duty for a primary-side bridge circuit, a secondary-side duty for a secondary-side bridge circuit, and a phase shift amount between the primary-side bridge circuit and the secondary-side bridge circuit, on the basis of a solution of an optimization problem for minimizing a peak absolute value of current flowing through the transformer, under a constraint condition that zero voltage switching operation is achieved, at an operation point based on the command value, thus achieving zero voltage switching operation and suppressing increase in conduction loss, without increase in the number of components.
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公开(公告)号：US10541625B2
公开(公告)日：2020-01-21
申请号：US16341784
申请日：2017-08-29
IPC分类号： H02M7/538 , H02M7/5387 , H02M1/00 , H01L25/11
摘要： In a conversion circuit having a plurality of switching elements connected in series and parallel and a capacitor, the respective parts are connected by an external stacked conductor in which a P conductor connected to the positive electrode of the capacitor, an N conductor connected to the negative electrode of the capacitor (2), an AC conductor, and an even number of intermediate conductors connected between the plurality of switching elements, are stacked in plural layers. The respective switching elements are arranged such that the mutual positional relationship between the positive terminals and the negative terminals is the same as a direction of main current flowing through the external stacked conductor. The plurality of switching elements are arranged symmetrically with respect to a center line of the external stacked conductor which is in the same direction as the main current. External connection terminals are provided to the AC conductor, so as to be positioned symmetrically with respect to the center line.
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