Patents by Inventor Youzhun CAI
Youzhun CAI has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11750082Abstract: A power device with a protection circuit is provided. The power device includes a power module, a power output terminal, a converter module, a bus capacitor, and a protection circuit. The power module receives an input power. The converter module, the protection circuit, and the bus capacitor is electrically connected between the power module and the power output terminal. The protection circuit is configured for overvoltage protection when the input power being overvoltage, suppressing the surge current when booting up the power device, and regulating the voltage on the bus capacitor under overvoltage and undervoltage conditions.Type: GrantFiled: March 25, 2021Date of Patent: September 5, 2023Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Zhenfu Li, Changhe Wang, Lixiang Wang, Youzhun Cai
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Patent number: 11611288Abstract: The present disclosure discloses a composite switching circuit, including a plurality of first semiconductor devices connected in series; and at least one second semiconductor device each connected in parallel to one of the plurality of first semiconductor devices. The composite switching circuit is connected to an input source. The second semiconductor device is turned off during a preset period to transfer a current flowing through the second semiconductor device to the first semiconductor devices connected in parallel to the second semiconductor device.Type: GrantFiled: March 2, 2021Date of Patent: March 21, 2023Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Junlai Huang, Youzhun Cai, Lingfeng Jiang, Junhao Ji
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Publication number: 20210313901Abstract: The present disclosure discloses a composite switching circuit, including a plurality of first semiconductor devices connected in series; and at least one second semiconductor device each connected in parallel to one of the plurality of first semiconductor devices. The composite switching circuit is connected to an input source. The second semiconductor device is turned off during a preset period to transfer a current flowing through the second semiconductor device to the first semiconductor devices connected in parallel to the second semiconductor device.Type: ApplicationFiled: March 2, 2021Publication date: October 7, 2021Inventors: Junlai HUANG, Youzhun CAI, Lingfeng JIANG, Junhao JI
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Publication number: 20210305891Abstract: A power device with a protection circuit is provided. The power device includes a power module, a power output terminal, a converter module, a bus capacitor, and a protection circuit. The power module receives an input power. The converter module, the protection circuit, and the bus capacitor is electrically connected between the power module and the power output terminal. The protection circuit is configured for overvoltage protection when the input power being overvoltage, suppressing the surge current when booting up the power device, and regulating the voltage on the bus capacitor under overvoltage and undervoltage conditions.Type: ApplicationFiled: March 25, 2021Publication date: September 30, 2021Inventors: Zhenfu Li, Changhe Wang, Lixiang Wang, Youzhun Cai
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Patent number: 11101738Abstract: A power converter includes a PFC circuit, a first capacitor, a second capacitor and an auxiliary circuit. The PFC circuit provides a first intermediate voltage to the first capacitor. The auxiliary circuit includes a first auxiliary branch circuit and a second auxiliary branch circuit. When the first auxiliary branch circuit is enabled, and the first intermediate voltage is transmitted to the second capacitor through the first auxiliary branch circuit. When the second auxiliary branch circuit is enabled, the first intermediate voltage is boosted by the second auxiliary branch circuit, so that a second intermediate voltage is provided by the second capacitor. While an operation state of the load is switched between a light load condition and a heavy load condition, one of the first auxiliary branch circuit and the second auxiliary branch circuit is selectively enabled.Type: GrantFiled: June 12, 2020Date of Patent: August 24, 2021Assignee: DELTA ELECTRONICS, INC.Inventors: Junlai Huang, Youzhun Cai, Dominik Reinhard Beinlich, Lingfeng Jiang
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Publication number: 20200403517Abstract: A power converter includes a PFC circuit, a first capacitor, a second capacitor and an auxiliary circuit. The PFC circuit provides a first intermediate voltage to the first capacitor. The auxiliary circuit includes a first auxiliary branch circuit and a second auxiliary branch circuit. When the first auxiliary branch circuit is enabled, and the first intermediate voltage is transmitted to the second capacitor through the first auxiliary branch circuit. When the second auxiliary branch circuit is enabled, the first intermediate voltage is boosted by the second auxiliary branch circuit, so that a second intermediate voltage is provided by the second capacitor. While an operation state of the load is switched between a light load condition and a heavy load condition, one of the first auxiliary branch circuit and the second auxiliary branch circuit is selectively enabled.Type: ApplicationFiled: June 12, 2020Publication date: December 24, 2020Inventors: Junlai Huang, Youzhun Cai, Dominik Reinhard Beinlich, Lingfeng Jiang
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Patent number: 10225935Abstract: A power conversion device includes an input conversion module, an output conversion module, a filtering module and a controlling module, which are installed on a main board. The main board includes a first edge, a second edge, a third edge and a fourth edge. The first edge and the second edge are opposed to each other. The third edge and the fourth edge are opposed to each other. A first part of the input conversion module is located near the first edge and the third edge. A second part of the input conversion module is near the first edge and the fourth edge. An airflow channel is formed between the first part and the second part. The output conversion module is near the second edge. The filtering module is near the second edge. The controlling module is arranged between the first part and the third edge.Type: GrantFiled: April 12, 2017Date of Patent: March 5, 2019Assignee: DELTA ELECTRONICS (THAILAND) PUBLIC COMPANY LIMITEDInventors: Tie Chen, Youzhun Cai, Keting Fang, Chengfeng Yu
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Patent number: 10097105Abstract: The present invention provides a synchronous rectification module. The synchronous rectification module includes a circuit board, a transformer, two synchronous rectification sets and a grounding set. The transformer includes a primary winding and a secondary electrically-conductive foil winding. The first and second synchronous rectification sets are symmetrically disposed on the circuit board, corresponding to the transformer and electrically connected to a secondary dotted end tap and a secondary synonyms end tap of the secondary electrically-conductive foil winding respectively.Type: GrantFiled: April 12, 2017Date of Patent: October 9, 2018Assignee: DELTA ELECTRONICS (THAILAND) PUBLIC COMPANY LIMITEDInventors: Youzhun Cai, Chengfeng Yu, Sanchao Sun, Jiajia Ouyang
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Publication number: 20180205323Abstract: The present invention provides a synchronous rectification module. The synchronous rectification module includes a circuit board, a transformer, two synchronous rectification sets and a grounding set. The transformer includes a primary winding and a secondary electrically-conductive foil winding. The first and second synchronous rectification sets are symmetrically disposed on the circuit board, corresponding to the transformer and electrically connected to a secondary dotted end tap and a secondary synonyms end tap of the secondary electrically-conductive foil winding respectively.Type: ApplicationFiled: April 12, 2017Publication date: July 19, 2018Inventors: Youzhun CAI, Chengfeng YU, Sanchao SUN, Jiajia OUYANG
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Publication number: 20180206338Abstract: A power conversion device includes an input conversion module, an output conversion module, a filtering module and a controlling module, which are installed on a main board. The main board includes a first edge, a second edge, a third edge and a fourth edge. The first edge and the second edge are opposed to each other. The third edge and the fourth edge are opposed to each other. A first part of the input conversion module is located near the first edge and the third edge. A second part of the input conversion module is near the first edge and the fourth edge. An airflow channel is formed between the first part and the second part. The output conversion module is near the second edge. The filtering module is near the second edge. The controlling module is arranged between the first part and the third edge.Type: ApplicationFiled: April 12, 2017Publication date: July 19, 2018Inventors: Tie Chen, Youzhun Cai, Keting Fang, Chengfeng Yu