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公开(公告)号：US20250080008A1
公开(公告)日：2025-03-06
申请号：US18778691
申请日：2024-07-19
Applicant: Delta Electronics (Shanghai) Co., Ltd.
Inventor： Yichao Wang , Yuhua Hu , Lu Wang , Kai Dong
Abstract: A multi-level conversion circuit and a cycle-by-cycle protection method therefor are provided. The cycle-by-cycle protection method includes steps of: (a) determining main switches and synchronous rectification switches; (b) controlling the main switches to operate in a normal mode; (c) detecting a current flowing through the inductor, and determining whether the current exceeds a threshold; (d) when the current exceeds the threshold, defining the main switch in an on state as a target main switch, switching the target main switch to a current limiting mode for turning off the target main switch; and (e) after the target main switch is switched to the current limiting mode, if the current is lower than the threshold, at a moment when a falling edge of control signals in a reference mode for the main switches first appears, switching the target main switch to a state in the reference mode corresponding to the moment.
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公开(公告)号：US20250079974A1
公开(公告)日：2025-03-06
申请号：US18780138
申请日：2024-07-22
Applicant: Delta Electronics (Shanghai) Co., Ltd.
Inventor： Yuhua Hu , Lu Wang , Yichao Wang , Kai Dong
Abstract: A multi-level conversion circuit and a cycle-by-cycle protection method therefor are provided. The cycle-by-cycle protection method includes steps of: (a) determining main switches and synchronous rectification switches; (b) controlling the main switches to operate in a normal mode; (c) detecting a current flowing through the inductor, and determining whether the current exceeds a threshold; (d) when the current exceeds the threshold, defining the main switch in an on state and having shortest turn-on duration as a target main switch, switching the target main switch to a current limiting mode for turning it off; and (e) after switching the target main switch to the current limiting mode, if the current is lower than the threshold, at a moment when a falling edge of control signals in a reference mode for the main switches first appears, switching the target main switch to a state in the reference mode corresponding to the moment.
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公开(公告)号：US20240006988A1
公开(公告)日：2024-01-04
申请号：US18211362
申请日：2023-06-19
Applicant: Delta Electronics (Shanghai) Co., Ltd.
Inventor： Kai Dong , Yuesen Guo
CPC classification number: H02M1/4258 , H02M1/0009 , H02M7/219
Abstract: A totem pole power factor correction circuit includes a detection module and a control unit. The detection module includes a first detection resistor and a first detection circuit. After a voltage difference between the two terminals of the first detection resistor is detected by the first detection circuit, an output voltage is generated. The control unit determines the operating state of the totem pole power factor correction circuit according to the output voltage. If the totem pole power factor correction circuit is in the normal working state, and the totem pole power factor correction circuit is in a steady state or the output power (or the input voltage) is increased or decreased, the control unit controls the on/off states of the corresponding switches in the totem pole power factor correction circuit according to the output voltage.
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公开(公告)号：US20230387813A1
公开(公告)日：2023-11-30
申请号：US18138476
申请日：2023-04-24
Inventor： Kai Dong , Wenxing Zhong , Yuesen Guo , Hui Wang , Jinfa Zhang , Dehong Xu
IPC: H02M3/335
CPC classification number: H02M3/33573 , H02M3/33576
Abstract: An isolated DC-DC converter including n conversion circuit units is provided. In each conversion circuit unit, a first connection node is formed between two switching components of a first primary bridge arm, and a second connection node is formed between two electronic components of a second primary bridge arm. A third connection node is formed between two switching components of a first secondary bridge arm, and a fourth connection node is formed between two switching components of a second secondary bridge arm. A first coupling inductor and A first capacitor are serially coupled between the first and third connection nodes. A second coupling inductor and a second capacitor are serially coupled between the second and fourth connection nodes. In the n conversion circuit units, the primary circuit units are electrically connected in series or in parallel, and the secondary circuit units are electrically connected in parallel or in series correspondingly.
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公开(公告)号：US20230353046A1
公开(公告)日：2023-11-02
申请号：US18138587
申请日：2023-04-24
Applicant: Delta Electronics (Shanghai) Co., Ltd.
Inventor： Yuesen Guo , Kai Dong
IPC: H02M1/42
CPC classification number: H02M1/4233
Abstract: A totem pole power factor correction circuit is provided. The detection module in the totem pole power factor correction circuit includes a detection resistor and a detection circuit. If the output voltage outputted by the detection circuit is greater than or equal to an upper limit voltage threshold or lower than or equal to a lower limit voltage threshold, at least a third switch and a fourth switch are turned off under control of the control unit. Consequently, the totem pole power factor correction circuit can be protected. Under this circumstance, the protecting measure can be taken immediately. Consequently, the possibility of causing damage of the totem pole power factor correction circuit will be minimized. In other words, the performance of the totem pole power factor correction circuit is enhanced.
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Patent Agency Ranking
公开(公告)号：US20230006540A1
公开(公告)日：2023-01-05
申请号：US17807142
申请日：2022-06-16
Applicant: Delta Electronics (Shanghai) Co.,Ltd.
Inventor： Yi-Chao Wang , Kai Dong , Shuai-Lin Du , Jin-Fa Zhang
Abstract: The present disclosure provides a power conversion device. The power conversion device includes the multi-level power factor correction circuit, the at least one output capacitor, the at least one input capacitor group, the first resonant conversion circuit and the second resonant conversion circuit. The at least one input capacitor group includes the first input capacitor and the second input capacitor. The at least one output capacitor is connected to an output part of the multi-level power factor correction circuit. The at least one input capacitor group is connected to the at least one output capacitor in parallel. The second input capacitor is connected to the first input capacitor in series. The input part of the first resonant conversion circuit is connected to first input capacitor in parallel. The input part of the second resonant conversion circuit is connected to the second input capacitor in parallel.
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公开(公告)号：US20220021297A1
公开(公告)日：2022-01-20
申请号：US17153063
申请日：2021-01-20
Inventor： Dehong Xu , Kai Dong , Jinfa Zhang
Abstract: A power factor correction circuit includes an input power source, a first bridge arm, a second bridge arm, an output capacitor and an active clamp unit. The first bridge arm includes a first switch and a second switch in series. The second bridge arm includes a third switch and a fourth switch in series. The active clamp unit includes a second inductor, a clamp capacitor and a fifth switch. The power factor correction circuit may realize the ZVS function of the first switch and the second switch by the collaboration of the active clamp unit and the conduction/non-conducting state of the first switch, the second switch, the third switch and the fourth switch.
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公开(公告)号：US12279403B2
公开(公告)日：2025-04-15
申请号：US18340907
申请日：2023-06-26
Applicant: Delta Electronics (Shanghai) Co.,Ltd.
Inventor： Kai Dong , Yong Huang , Zhongwei Ke , Jinfa Zhang
Abstract: The present application provides a power supply system for supplying power to network device, comprising power supply module, housing, and stereoscopic accommodating space therebetween. The power supply module without a fan comprises: a primary circuit comprising at least one primary switch and configured to receive AC input voltage and convert the AC input voltage into a first voltage; a transformer comprising primary and secondary windings and configured to convert the first voltage into a second voltage, the primary winding is coupled to the primary circuit; and a secondary circuit comprising at least one secondary switch and configured to convert the second voltage into a DC output voltage for the network device, the secondary circuit is coupled to the secondary winding, the secondary switch adopts SMT package, and power density of the power supply module is 60 W/inch3 or more. The stereoscopic accommodating space is filled with liquid coolant for cooling.
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公开(公告)号：US12225694B2
公开(公告)日：2025-02-11
申请号：US17900525
申请日：2022-08-31
Applicant: Delta Electronics (Shanghai) Co., Ltd.
Inventor： Mingjuan Zhang , Jun Yang , Kai Dong
Abstract: The present disclosure relates to a surface-mounted heat sink and a power module using the same. The power module includes a circuit board, a magnetic element and at least one power device. The magnetic element is disposed at an upper side of the circuit board, the at least one power device is disposed on a surface of the circuit board and located between the magnetic element and a lower side of the circuit board. The surface-mounted heat sink is disposed on the surface of the circuit board and adjacent to the at least one power device. A top surface disposed on one side of the magnetic element and the surface of the circuit board form a limiting height, the surface-mounted heat sink has a first height formed between a sucked surface and a surface-mounted surface thereof, and the limiting height is greater than or equal to the first height.
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公开(公告)号：US12160980B2
公开(公告)日：2024-12-03
申请号：US17657361
申请日：2022-03-31
Applicant: Delta Electronics (Shanghai) Co., Ltd.
Inventor： Bing Fan , Yucai Zhao , Li Zhu , Yichao Wang , Kai Dong
Abstract: The application provides a power supply device comprising two input ports disposed at a front end of the power supply device; at least one fan disposed behind the two input ports and two isolated power supplies connected respectively to the corresponding one of the two input ports and disposed behind the two input ports and the at least one fan. Each of the isolated power supplies comprises a main power circuit having at least one module, and each module comprises a PCB and a magnetic element and/or switching devices. The at least one module includes an isolated circuit module comprises a transformer having windings formed by laying copper in the PCB and the magnetic core fixed on the PCB. And at least one fan is configured for heat dissipation of the at least one module.
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