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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
发明人： Kai Dong , Wenxing Zhong , Yuesen Guo , Hui Wang , Jinfa Zhang , Dehong Xu
IPC分类号： H02M3/335
CPC分类号： H02M3/33573 , H02M3/33576
摘要： 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：US20220021297A1
公开(公告)日：2022-01-20
申请号：US17153063
申请日：2021-01-20
发明人： Dehong Xu , Kai Dong , Jinfa Zhang
摘要： 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：US11251698B2
公开(公告)日：2022-02-15
申请号：US17153063
申请日：2021-01-20
发明人： Dehong Xu , Kai Dong , Jinfa Zhang
摘要： 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：US20220021296A1
公开(公告)日：2022-01-20
申请号：US17152882
申请日：2021-01-20
发明人： Kai Dong , Dehong Xu , Jinfa Zhang
摘要： A control method for a power factor correction circuit is disclosed. The power factor correction circuit includes a first bridge arm, a second bridge arm, an output capacitor and an active clamp unit. The control method includes steps of providing a first driving waveform to control a main switch, providing a second driving waveform to control an auxiliary switch, and providing a third driving signal to control a fifth switch. A first delay time is between the turning-off time point of the third driving signal and the turning-on time point of the first driving waveform, a second delay time is between the turning-on time point of the first driving waveform and the turning-off time point of the second driving waveform, and a third delay time is between the turning-off time point of the second driving waveform and the turning-on time point of the third driving signal.
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公开(公告)号：US11462994B2
公开(公告)日：2022-10-04
申请号：US17152882
申请日：2021-01-20
发明人： Kai Dong , Dehong Xu , Jinfa Zhang
摘要： A control method for a power factor correction circuit is disclosed. The power factor correction circuit includes a first bridge arm, a second bridge arm, an output capacitor and an active clamp unit. The control method includes steps of providing a first driving waveform to control a main switch, providing a second driving waveform to control an auxiliary switch, and providing a third driving signal to control a fifth switch. A first delay time is between the turning-off time point of the third driving signal and the turning-on time point of the first driving waveform, a second delay time is between the turning-on time point of the first driving waveform and the turning-off time point of the second driving waveform, and a third delay time is between the turning-off time point of the second driving waveform and the turning-on time point of the third driving signal.
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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
发明人： Kai Dong , Yuesen Guo
CPC分类号： H02M1/4258 , H02M1/0009 , H02M7/219
摘要： 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：US20230353046A1
公开(公告)日：2023-11-02
申请号：US18138587
申请日：2023-04-24
发明人： Yuesen Guo , Kai Dong
IPC分类号： H02M1/42
CPC分类号： H02M1/4233
摘要： 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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公开(公告)号：US20230006540A1
公开(公告)日：2023-01-05
申请号：US17807142
申请日：2022-06-16
发明人： Yi-Chao Wang , Kai Dong , Shuai-Lin Du , Jin-Fa Zhang
摘要： 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：US11777397B2
公开(公告)日：2023-10-03
申请号：US17810642
申请日：2022-07-05
发明人： Kai Dong , Yichao Wang , Shuailin Du , Jinfa Zhang
CPC分类号： H02M1/0095 , H02M1/32 , H02M7/4837 , H02M7/06
摘要： A multilevel conversion circuit having a flying capacitor is provided, including: a first bridge arm; a second bridge arm including a flying capacitor, the midpoints of the second and first bridge arms connected to a series branch defined by a first current limiting circuit, a power supply and an inductor; a DC bus capacitor connected in parallel to the first and second bridge arms; a rectifier circuit having an input end coupled to the power supply and an output end connected to a first auxiliary power supply; and a controller coupled to the first auxiliary power supply and the plurality of switches of the second bridge arm to control corresponding switches of the second bridge arm, the power supply charges the flying capacitor through the corresponding switches of the first and second bridge arms and the first current limiting circuit.
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10.发明授权公开(公告)号：US12113455B2
公开(公告)日：2024-10-08
申请号：US17810639
申请日：2022-07-04
发明人： Yichao Wang , Kai Dong , Shuailin Du , Jinfa Zhang
CPC分类号： H02M7/4837 , H02M1/0085 , H02M1/4233
摘要： Multilevel conversion circuit having a flying capacitor and method for pre-charging the same are provided. The multilevel conversion circuit includes: a first bridge arm including a plurality of switches connected in series; a second bridge arm including a plurality of switches connected in series and a flying capacitor group, midpoints of the two bridge arms connected to a power supply and an inductor to form a series branch; a DC bus capacitor to which the two bridge arms are connected in parallel; a first voltage clamping module connected between a first end of the flying capacitor group and a first end of the DC bus capacitor; and a second voltage clamping module connected between a second end of the flying capacitor group and a second end of the DC bus capacitor.
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