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公开(公告)号：US20240021358A1
公开(公告)日：2024-01-18
申请号：US18037518
申请日：2021-05-06
Applicant: Sungrow Power Supply Co., Ltd.
Inventor： Guoqing Cai , Jiacai Zhuang , Jun Xu , Wei Liu
CPC classification number: H01F27/306 , H01F27/24 , H01F27/29
Abstract: The present invention provides a transformer, which is applied to the technical field of power transmission and distribution, the transformer comprising an iron core, body windings, and a semi-conductive layer, the body windings being sleeved on a core post of the iron core, and the semi-conductive layer being correspondingly provided with the body windings. Auxiliary circuits are connected to the body windings, the auxiliary circuits and preset positions of the body windings have equal potentials, and an equipotential connection point of the semi-conductive layer is provided by the auxiliary circuits. After the semi-conductive layer is connected to the auxiliary circuits, the effect of balancing the electric field distribution of a winding can be achieved. In the transformer provided in the present invention, an equipotential connection point having an equal potential with the preset positions of the body windings of the transformer is provided by means of the auxiliary circuits, and the semi-conductive layer is directly connected to the equipotential connection point, thereby achieving set effects of the semi-conductive layer, that is, improving the electric field distribution of windings, and improving the high-voltage insulation performance of the transformer without damaging the insulation between litz wire strands.
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公开(公告)号：US11671015B2
公开(公告)日：2023-06-06
申请号：US17040512
申请日：2019-12-30
Applicant: SUNGROW POWER SUPPLY CO., LTD.
Inventor： Tengfei Wang , Jiacai Zhuang , Jun Xu , Nianan Pan
CPC classification number: H02M3/1584 , H02M1/322 , H02M3/1552
Abstract: A three-level Boost circuit is provided. The three-level Boost circuit includes: an input capacitor, an inductor, a first switch, a second switch, a first freewheeling diode, a second freewheeling diode, a flying capacitor, a balance capacitor, a charging diode, a clamp diode, a discharging diode and an output series capacitor bank. The output series capacitor bank includes multiple output capacitors connected in series, and has a first node and a second node; a potential of the first node is higher than a potential of a cathode of the charging diode, and a potential difference between a cathode of the second freewheeling diode and the second node does not exceed a withstand voltage of the second freewheeling diode.
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3.发明授权公开(公告)号：US11239746B2
公开(公告)日：2022-02-01
申请号：US16783310
申请日：2020-02-06
Applicant: SUNGROW POWER SUPPLY CO., LTD.
Inventor： Tao Zhao , Fushuai Zhuang , Xinyu Wang , Jiacai Zhuang , Mingda Wang , Yuan Zhuang
Abstract: A two-stage converter, a method for starting the two-stage converter, an LLC converter, and an application system are provided. A controller of the LLC converter of the two-stage converter first controls a main circuit of the LLC converter to perform hiccup charging on a direct current bus of a later-stage converter at a preset interval, so that the direct current bus voltage of the later-stage converter gradually increases, until an auxiliary power supply of the later-stage converter starts to operate, to supply power to the controller of the later-stage converter. After the controller of the later-stage converter reports the detected direct current bus voltage, the controller of the LLC converter determines whether the output voltage of the LLC converter increases to a hiccup starting voltage. If so, the controller of the LLC converter controls the main circuit to operate in a hiccup voltage stabilization phase.
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公开(公告)号：US12231031B2
公开(公告)日：2025-02-18
申请号：US18010435
申请日：2021-05-21
Applicant: Sungrow Power Supply Co., Ltd.
Inventor： Yue Dong , Jiacai Zhuang , Jun Xu
Abstract: A cascaded power electronic transformer and a method for controlling the same are provided. The method includes: calculating electrical angles θi1 and θkps of an sth transformer and a compensation electrical angle θj of a jth transformer; adding the compensation electrical angle θj to the electrical angle θkps of the jth transformer, to obtain a compensated electrical angle θkps of the jth transformer; and calculating a square wave of a bridge arm voltage of each of the m primary converters and the r secondary converters of the sth transformer based on the electrical angle θi1 and the electrical angle θkps of the sth transformer after compensation.
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公开(公告)号：US11165345B2
公开(公告)日：2021-11-02
申请号：US16537056
申请日：2019-08-09
Applicant: SUNGROW POWER SUPPLY CO., LTD.
Inventor： Jiacai Zhuang , Jun Xu , Bing Zhang , Peng Wang , Peng Wen
Abstract: A multi-level boost apparatus. Voltage allocation among N first switches is achieved by connecting N voltage dividing modules, sequentially connected in series, in parallel with the N first voltage switches, respectively. Thereby, a voltage across each of the N first switches is within a safety range. Even if an input voltage is high and a voltage across a flying capacitor is zero at an instant of being powered, it is prevented that a second one to an N-th one of the N first switches break down due to overvoltage.
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Patent Agency Ranking
公开(公告)号：US10355618B2
公开(公告)日：2019-07-16
申请号：US15950666
申请日：2018-04-11
Applicant: SUNGROW POWER SUPPLY CO., LTD.
Inventor： Jiacai Zhuang , Yuqing Cui , Deyong Zhao , Xiaohui Luo , Chaoxuan Zhang , Jun Xu , Yilei Gu , Xinyu Wang
Abstract: An ANPC inverter, a zero-crossing switching method and a zero-crossing switching apparatus of the ANPC inverter are provided. The method includes: controlling switch states of switch devices in a bridge leg to change according to a preset logic when zero-crossing switching occurs in an output voltage instruction of the bridge leg, so as to prevent overvoltage in the switch device in the bridge leg. The preset logic includes switching among a sequence of switch state combinations. Switch state combinations of the switch devices before and after the zero-crossing switching occurs are defined as the first and second switch state combinations of the sequence. The second to the penultimate switch state combinations are all safe switch state combinations selected in advance, in each of which a maximum voltage borne by the switch devices in the bridge leg is clamped to a safe limit value.
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公开(公告)号：US11863067B2
公开(公告)日：2024-01-02
申请号：US17528273
申请日：2021-11-17
Applicant: Sungrow Power Supply Co., Ltd.
Inventor： Guoqing Cai , Jiacai Zhuang , Xinyu Wang , Jun Xu
Abstract: Provided is a bridge cascade system, which includes at least one phase unit and a driving unit for the phase unit. The phase unit includes N bridge topologies cascaded on alternating current AC sides. The driving unit includes one driving power supply circuit, multiple bootstrap power supply circuits and 2N driving circuits. In the phase unit, the driving circuits are powered by the driving power supply circuit directly or through corresponding bootstrap power supply circuits. The driving circuits are configured to provide driving signals for corresponding switch transistors in the phase unit. In this way, one driving power supply is matched with multiple bootstrap power supply circuits, realizing power supply to the driving circuits corresponding to the switch transistors of all bridge topologies, which reduces the difficulty in designing the driving power supply for the bridge cascade system and reduces cost for the system.
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公开(公告)号：US20230387780A1
公开(公告)日：2023-11-30
申请号：US18029401
申请日：2021-09-06
Applicant: Sungrow Power Supply Co., Ltd.
Inventor： Jiacai Zhuang , Jun Xu , Yue Dong
CPC classification number: H02M1/007 , H02M3/33573 , H02M3/33584
Abstract: A cascaded multi-port converter and a three-phase medium-voltage input system. Input terminals of the module units are cascaded. In each module unit: input ends of the high-voltage conversion units are cascaded, a magnetic core of a multi-winding transformer is wound with multiple primary windings and at least one secondary winding, an output end of each high-voltage conversion unit is connected to a corresponding primary winding, and the secondary winding is connected to an input end of a corresponding low-voltage rectifying unit. Therefore, the windings of the multiple high-voltage conversion units share the magnetic core, and the number of the multi-winding transformers and the number of the low-voltage rectifying units can be reduced, thereby reducing the volume, weight, and costs of the cascaded multi-port converter.
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公开(公告)号：US20220376497A1
公开(公告)日：2022-11-24
申请号：US17703742
申请日：2022-03-24
Applicant: Sungrow Power Supply Co., Ltd.
Inventor： Jiacai Zhuang , Wei Liu , Jun Xu
Abstract: A photovoltaic power generation system and a method for controlling power balance are provided. The system includes at least two photovoltaic arrays, at least one power balance circuit and a power converter. Each of input ports of the power balance circuit is connected with at least one photovoltaic array, and an output port of the power balance circuit is connected with the power converter. The power balance circuit performs power transfer based on a difference between output powers of the two photovoltaic arrays to control a difference between powers of two output terminals of the power balance circuit to be within a preset range.
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10.发明授权公开(公告)号：US11424694B2
公开(公告)日：2022-08-23
申请号：US16729254
申请日：2019-12-27
Applicant: SUNGROW POWER SUPPLY CO., LTD.
Inventor： Jiacai Zhuang , Jun Xu , Bing Zhang , Peng Wen , Peng Wang
IPC: H02M7/487 , H02M7/5387 , H02M1/36 , H02M1/08
Abstract: A method for controlling shutdown wave blocking of a multilevel inverter circuit and an application apparatus for applying the method are provided. After a shutdown command is issued, the multilevel inverter circuit is controlled to switch between a free state and a specific turn-on state. The free state is a state in which all switch tubes in the multilevel inverter circuit are turned off. The specific turn-on state is a state in which voltage stress withstood by a switch tube, on which clamping protection is not performed, in the multilevel inverter circuit is zero by controlling a specific combination of switch tubes in the multilevel inverter circuit to be turned on.
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