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公开(公告)号：US10476395B2
公开(公告)日：2019-11-12
申请号：US15827508
申请日：2017-11-30
发明人： Heping Dai
IPC分类号： H02M3/335 , H02M1/084 , H02J9/06 , H02M7/5387 , H02M1/00
摘要： Aspects of the disclosure provide a voltage converting system. The voltage converting system includes a first power converter configured to convert an input voltage to an intermediate voltage, a second power converter configured to convert the intermediate voltage to an output voltage at a target voltage level, and a control circuit coupled to the first power converter and the second power converter. The control circuit is configured to, upon detection of the input voltage having a voltage level that is within a first range, perform a close-loop control of the second power converter to output the output voltage at the target voltage level.
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公开(公告)号：US10476372B2
公开(公告)日：2019-11-12
申请号：US14579644
申请日：2014-12-22
发明人： Heping Dai , Liming Ye , Jinbo Huang , Dianbo Fu
摘要： A method comprises detecting an input voltage and an output voltage of a buck-boost converter, wherein the buck-boost converter comprises a first high-side switch and a first low-side switch connected in series across an input capacitor, a second high-side switch and a second low-side switch connected in series across an output capacitor and an inductor coupled between a common node of the first high-side switch and the first low-side switch, and a common node of the second high-side switch and the second low-side switch and configuring the buck-boost converter such that at least one of the first high-side switch and second low-side switch operates at a fixed duty cycle mode.
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公开(公告)号：US10361626B2
公开(公告)日：2019-07-23
申请号：US16007325
申请日：2018-06-13
发明人： Dianbo Fu , Xiaolin Mao , Heping Dai
摘要： AC to DC converters, more specifically Power Factor Correction (PFC) circuits, using a multi-level waveform and hybrid devices are presented. From an AC voltage input a multi-level waveform is generated, which is used to generate high and low DC output voltage levels. The multi-level waveform is connected to the DC outputs through a corresponding intermediate node by an initial switch, and from the intermediate node to the corresponding output by a hybrid device. The hybrid device includes a first current path, such as a series connected switch-diode pair, in parallel with second current path of a relatively faster and lower current device, such as a diode. The resultant arrangement can use devices having lower voltage ratings relative to typical PFC circuit designs.
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公开(公告)号：US10333410B2
公开(公告)日：2019-06-25
申请号：US15682989
申请日：2017-08-22
发明人： Huan Zhang , Heping Dai , Shuo Wang
摘要： An apparatus includes: a first inductor coupled to a first node and a second node; a second inductor coupled to a third node and a fourth node; a third inductor coupled to the fourth node and a fifth node, wherein the first inductor, the second inductor, and the third inductor form a transformer; and a compensation capacitor coupled to the fourth node and one of the first node and the second node and including, a compensation capacitance. A method of manufacturing a resonant converter, the method includes: obtaining the resonant converter, wherein the resonant converter includes a transformer; determining a parasitic capacitance of the transformer; calculating a compensation capacitance based on the parasitic capacitance; and adding a compensation capacitor across the transformer, wherein the compensation capacitor includes the compensation capacitance.
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公开(公告)号：US20190123650A1
公开(公告)日：2019-04-25
申请号：US16212943
申请日：2018-12-07
发明人： Liming Ye , Jinbo Huang , Heping Dai , Dianbo Fu , Daoshen Chen
IPC分类号： H02M3/158
CPC分类号： H02M3/1582 , H02M2001/0025 , H02M2001/0032 , H02M2001/0058 , Y02B70/1425 , Y02B70/1491 , Y02B70/16
摘要： A method includes generating a first ramp signal for controlling a first portion of a converter, generating a second ramp signal for controlling a second portion of the converter, controlling a state of a first switch of the first portion through comparing the first ramp signal to a control signal and a state of a first switch of the second portion through comparing the second ramp signal to the control signal and determining a switching cycle of the converter through comparing a current flowing through an inductor of the converter to a threshold.
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公开(公告)号：US10199947B2
公开(公告)日：2019-02-05
申请号：US15479885
申请日：2017-04-05
发明人： Liming Ye , Heping Dai , Dianbo Fu
IPC分类号： H02M3/335
摘要： In an Input-Series-Output-Parallel (ISOP)-type power converter circuit, a DC-to-DC converter has a positive input coupled to a DC power source and a negative input connected to a negative output. A plurality of capacitors are coupled in series between a positive output of the converter and a circuit ground, the negative output of the converter coupled to a common node of first and second capacitors. A half-bridge inverter network is coupled between the positive output and a circuit ground, each inverter having an input respectively coupled to the first capacitor and the second capacitor. A plurality of resonant tanks are coupled to an output of a respective one of first and second half-bridge inverters. A transformer is coupled to outputs of the plurality of resonant tanks. A rectifier circuit is coupled to a secondary winding of the transformer to provide a DC output voltage.
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公开(公告)号：US20190020280A1
公开(公告)日：2019-01-17
申请号：US16007273
申请日：2018-06-13
发明人： Dianbo Fu , Heping Dai
摘要： A hybid resonant DC to DC converter uses an LLC or other resonant structure on the primary side, applying a two state waveform to one end of the resonant structure and a multi-state waveform to the other end of the resonant structure. The waveforms are at or near the resonant resonant frequency and the output voltage level is regulated by varying the shape of the multi-state waveform by varying the duty cycle of the switches used to generate it. The allows the converter to operate near or at its optimal resonant point, resulting in higher efficiency, over a wide range of regulated output voltage levels.
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公开(公告)号：US10116219B2
公开(公告)日：2018-10-30
申请号：US15263121
申请日：2016-09-12
发明人： Daoshen Chen , Heping Dai , Xujun Liu , Zhihua Liu , Liming Ye , Dianbo Fu , Ce Liu , Bing Cai
摘要： A method comprises connecting a first resonant converter and a second resonant converter in parallel, detecting a first signal indicating a first soft switching process of the first resonant converter and a second signal indicating a second soft switching process of the second resonant converter and adjusting a first switching frequency of the first resonant converter by a first control circuit and a second switching frequency of the second resonant converter by a second control circuit until a load current flowing through the first resonant converter is substantially equal to a load current flowing through the second resonant converter.
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公开(公告)号：US20180309300A1
公开(公告)日：2018-10-25
申请号：US15493796
申请日：2017-04-21
发明人： Heping Dai , Xiaolin Mao , Dianbo Fu , Huibin Zhu
摘要： A method comprises operating a plurality of power optimizers connected in series between two input terminals of an inverter, wherein the plurality of power optimizers are connected to a plurality of solar panels to form a plurality of power modules connected in series, measuring operation parameters of the plurality of the solar panels, calculating a maximum power flow of each solar panel based upon the measuring, determining a mode transition range based upon the maximum power flows of the plurality of solar panels and configuring a first power optimizer to operate in a pass-through mode if a maximum power point tracking (MPPT) current of a first solar panel connected to the first power optimizer is within the mode transition range.
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公开(公告)号：US20180234022A1
公开(公告)日：2018-08-16
申请号：US15954424
申请日：2018-04-16
发明人： Liming Ye , Heping Dai , Dianbo Fu
CPC分类号： H02M3/33576 , H02M7/483 , H02M2001/0058 , Y02B70/1491
摘要： A converter is provided. The converter includes a first DC/DC converter, a non-isolated DC/DC converter and a control circuit. The first DC/DC converter includes a transformer, a primary side inverter and a secondary side rectifier. The primary side inverter and a secondary side rectifier are operable at multiple operating modes. The control circuit determines an operating mode for the primary side inverter or the secondary side rectifier, and controls the primary side inverter or the secondary side rectifier to change its respective operating mode.
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