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1.发明公开公开(公告)号：US20240275271A1
公开(公告)日：2024-08-15
申请号：US18606660
申请日：2024-03-15
申请人： ABB Schweiz AG
IPC分类号： H02M1/40
CPC分类号： H02M1/40
摘要： A control method for preventing saturation of a transformer during fast voltage changes by correction of magnetic flux of the transformer, the transformer having a primary winding with a power electronic converter and a secondary winding, the control method including estimating or measuring a primary signal including a primary voltage on the primary winding of the transformer and a primary current on the primary winding of the transformer, and injecting a correction signal including a correction voltage into the primary winding of the transformer so as to prevent saturation of the transformer.
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公开(公告)号：US12051968B2
公开(公告)日：2024-07-30
申请号：US18239536
申请日：2023-08-29
申请人： Orris Dent , Gregory Wiegand
发明人： Orris Dent , Gregory Wiegand
CPC分类号： H02M1/40 , H01F27/34 , H02M3/33546
摘要： System and method for managing a cumulative DC offset in a magnetizable material. A primary driving AC voltage and a magnetic flux sensor. The flux sensor output is continuously received into memory while the flux sensor output for each phase half-cycle is processed to continuously compute and re-compute in real time a flux-second integral for each half-cycle. The two half-cycle flux-second integrals are compared to each other for a DC offset value and the offset value drives a slow loop DC compensation circuit to steer a PWM control.
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公开(公告)号：US11929683B2
公开(公告)日：2024-03-12
申请号：US17812360
申请日：2022-07-13
CPC分类号： H02M3/33584 , H02M1/0064 , H02M1/40 , H02M1/0043 , H02M3/01
摘要： The present disclosure provides an isolated multi-phase DC/DC converter with a reduced quantity of blocking capacitors. In one aspect, the converter includes a multi-phase transformer having a primary circuit and a secondary circuit magnetically coupled to the primary circuit, the primary circuit having a first quantity of terminals, and the secondary circuit having a second quantity of terminals; a third quantity of blocking capacitors, each being electrically connected in series to a respective one of the terminals of the primary circuit; and a fourth quantity of blocking capacitors, each being electrically connected in series to a respective one of the terminals of the secondary circuit. The third quantity is one less than the first quantity. The fourth quantity is one less than the second quantity.
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公开(公告)号：US11777417B2
公开(公告)日：2023-10-03
申请号：US18099238
申请日：2023-01-19
发明人： Misha Kumar , Yungtaek Jang
CPC分类号： H02M3/33592 , H02M1/32 , H02M1/40 , H02M3/3353 , H02M3/33584 , H02H7/0455 , H02M1/0003 , H02M1/0041
摘要： A power converter and a control method thereof are provided. The power converter includes a primary side switching circuit, a secondary side switching circuit, a transformer, and a control circuit. The primary side switching circuit includes a first set of switches. The secondary side switching circuit includes a second set of switches. The transformer is coupled between the primary side switching circuit and the secondary side switching circuit. The control circuit is configured to control power transfer between the primary side switching circuit and the secondary side switching circuit by controlling the first and second sets of switches. The control circuit is adapted to enable and disable the first and second sets of switches in an enabling duration and a disabling duration respectively and alternatively.
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5.发明授权公开(公告)号：US11764666B2
公开(公告)日：2023-09-19
申请号：US17602074
申请日：2019-11-08
摘要： This DC pulse power supply device comprises a voltage clamper including a capacitor that is connected in parallel to a DC reactor in a chopper circuit provided in a pulsing unit in order to suppress increases in the surge voltage resulting from the leakage inductance of the DC reactor. During the start-up of pulsing operation, which is the initial stage of the pulse mode, the frequency of the pulsing operation of the chopper circuit is controlled over the period until the capacitor voltage is charged to a sufficient voltage to reset the magnetic saturation of the DC reactor.
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公开(公告)号：US20230133307A1
公开(公告)日：2023-05-04
申请号：US18064816
申请日：2022-12-12
发明人： Yushan Li , Liming Ye , Heping Dai
摘要： An apparatus includes a controller configured to generate a PWM signal for controlling a power switch of a forward converter, a bias switch and a bias capacitor connected in series and coupled to a bias winding of the forward converter, and a comparator having a first input connected to the bias capacitor, a second input connected to a predetermined reference and an output configured to generate a signal for controlling the bias switch to allow a magnetizing current from the bias winding to charge the bias capacitor when a voltage across the bias capacitor is less than the predetermined reference.
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公开(公告)号：US20220321015A1
公开(公告)日：2022-10-06
申请号：US17848720
申请日：2022-06-24
发明人： Mitsunao Fujimoto
摘要： A direct-current voltage conversion circuit having on/off control with a dead-time period performed alternately on a first switch and a second switch included in a direct-current voltage conversion circuit. When alternating current flows in a series circuit part including two transformers magnetically independent, current flows in an output circuit including a secondary side of one transformer, and energy is accumulated in the other transformer. The permeabilities of the magnetic cores in the first and second transformers is between 15 and 120.
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公开(公告)号：US11161193B2
公开(公告)日：2021-11-02
申请号：US14536058
申请日：2014-11-07
摘要： A welding-type power supply includes a controller, a preregulator, a preregulator bus, and an output converter. The controller has a preregulator control output and an output converter control output. The controller has a converter control output connected to the control input, and a flux balancing module. The converter control output is responsive to the flux balancing module such that the flux in the transformer remains balanced.
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公开(公告)号：US20210135578A1
公开(公告)日：2021-05-06
申请号：US16757201
申请日：2018-10-04
发明人： Shintaro TANAKA , Kenji KUBO , Takayuki OUCHI , Yuji SOBU , Naoya TAKAHASHI
摘要： A switching loss of a power conversion device is sufficiently reduced. A DC-DC converter includes a switching circuit that converts input first DC power into AC power, a transformer that performs voltage conversion of the AC power, and an output circuit that converts the AC power subjected to the voltage conversion by the transformer into second DC power. The control circuit that controls the DC-DC converter calculates a magnetic flux density value B of the transformer and controls a drive frequency of the switching circuit based on the calculated magnetic flux density value B.
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公开(公告)号：US20200186045A1
公开(公告)日：2020-06-11
申请号：US16794608
申请日：2020-02-19
申请人： ESAB AB
发明人： Andrzej MNICH
摘要： A power supply may include a power block to receive an input power and generate an output power; and a control system coupled to the power block, wherein the power block and control system are arranged to provide unidirectional current flow and bipolar voltage during operation of the power supply.
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