专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

61. 发明授权

US06344986B1 Topology and control method for power factor correction 失效
标题翻译：功率因数校正的拓扑和控制方法
公开(公告)号：US06344986B1
公开(公告)日：2002-02-05
申请号：US09595425
申请日：2000-06-15
申请人： Praveen K. Jain , Yan-Fei Liu
发明人： Praveen K. Jain , Yan-Fei Liu
IPC分类号： H02M542
CPC分类号： H02M1/4225 , H02M3/335 , Y02B70/126
摘要： In a power factor corrected AC-to-DC power supply system, a DC-to-DC power converter is coupled to the output of an AC-to-DC power converter in order to produce a regulated DC output signal from a rectified AC input signal. The AC-to-DC power converter and the DC-to-DC power converter each includes a switch for controlling the operation of their respective power converter. The AC-to-DC converter includes an inductor. The system provides power factor correction for minimizing harmonic distortion by including a controller that receives the regulated DC output voltage as a feedback signal, and in response, produces a series of drive pulses having predetermined constant duty cycle. These pulses are simultaneously fed to each switch, to operate the respective converters alternately between ON and OFF states. When the AC-to-DC converter is driven by a fixed duty cycle of the series of pulses, power factor correction is improved since the current flowing through the inductor is substantially proportional to the waveform of the rectified AC input signal. By preselecting the value of the inductor, the AC-to-DC converter is operable in a discontinuous mode when the instantaneous rectified AC input signal is low and in a continuous mode when the instantaneous rectified AC input signal is high.
摘要翻译：在功率因数校正的AC至DC电源系统中，DC-DC电力转换器耦合到AC-DC电力转换器的输出端，以便从整流的AC输入端产生稳定的DC输出信号信号。 AC-DC电力转换器和DC-DC电力转换器各自包括用于控制其各自功率转换器的操作的开关。 AC-DC转换器包括电感器。该系统通过包括接收调节的DC输出电压作为反馈信号的控制器来提供用于最小化谐波失真的功率因数校正，并且作为响应，产生具有预定的恒定占空比的一系列驱动脉冲。这些脉冲同时馈送到每个开关，以在各自的开关状态之间交替地操作相应的转换器。当由一系列脉冲的固定占空比驱动AC到DC转换器时，功率因数校正被改善，因为流过电感器的电流基本上与整流的AC输入信号的波形成正比。通过预选电感器的值，当瞬时整流的AC输入信号为低电平时，AC瞬间整流的AC输入信号为高电平时，AC-DC转换器可在不连续模式下工作。

62. 发明授权

US6005782A Flyback converter with soft switching using auxiliary switch and resonant circuit 失效
标题翻译：反激式转换器采用软开关辅助开关和谐振电路
公开(公告)号：US6005782A
公开(公告)日：1999-12-21
申请号：US173034
申请日：1998-10-16
申请人： Praveen K. Jain , Yan-Fei Liu , Youhao Xi
发明人： Praveen K. Jain , Yan-Fei Liu , Youhao Xi
IPC分类号： H02M1/34 , H02M3/335 , H02M1/12 , G05F1/10 , H02M3/24
CPC分类号： H02M1/34 , H02M3/33569 , H02M2001/342 , Y02B70/1433 , Y02B70/1491
摘要： A flyback converter has a main switch coupling a primary winding of a transformer between supply terminals, a duty cycle of the main switch controlling an output of the converter derived from a secondary winding of the transformer. Soft (zero voltage) switching of the main switch is facilitated by a snubber capacitor in parallel with the main switch. An auxiliary circuit coupled in parallel with the snubber capacitor and main switch includes a series-connected auxiliary switch, capacitor, and inductor coupled via another inductor to a full wave rectifier arrangement for recovering energy from the snubber capacitor. Resonant circuits provided by the auxiliary circuit facilitate soft switching of the auxiliary switch for low power loss and high frequency operation. The switches can be MOSFETs with reverse-poled diodes in parallel with their drain-source paths.
摘要翻译：反激式转换器具有主开关，其在电源端子之间耦合变压器的初级绕组，主开关的占空比控制从变压器的次级绕组获得的转换器的输出。主开关的软（零电压）开关由与主开关并联的缓冲电容器促成。与缓冲电容器和主开关并联耦合的辅助电路包括通过另一电感器耦合到全波整流器装置的串联辅助开关，电容器和电感器，用于从缓冲电容器恢复能量。由辅助电路提供的谐振电路便于辅助开关的软开关，用于低功耗和高频工作。这些开关可以是反向极化二极管与其漏源路径并联的MOSFET。

63. 发明申请

US20220103083A1 METHOD AND SYSTEM USING A NOISE FILTER TO DRIVE SYNCHRONOUS RECTIFIERS OF AN LLC DC-DC CONVERTER 有权
公开(公告)号：US20220103083A1
公开(公告)日：2022-03-31
申请号：US17425574
申请日：2020-01-24
申请人： Xiang ZHOU , Wenbo LIU , Bo SHENG , Yang CHEN , Andrew YUREK , Yan-Fei LIU , Lakshmi Varaha IYER , Gerd SCHLAGER , Michael NEUDORFHOFER , Wolfgang BAECK , MAGNA INTERNATIONAL INC.
发明人： Xiang ZHOU , Wenbo LIU , Bo SHENG , Yang CHEN , Andrew YUREK , Yan-Fei LIU , Lakshmi Varaha IYER , Gerd SCHLAGER , Michael NEUDORFHOFER , Wolfgang BAECK
IPC分类号： H02M3/335 , H02M1/44 , H02M1/08 , B60L53/20
摘要： An LLC power converter comprises a switching stage and a resonant tank, the switching stage configured to switch an input power at a switching frequency to apply a switched power to the resonant tank, and the resonant tank includes a resonant inductor, a resonant capacitor, and a parallel inductance. A transformer has a primary winding connected to the resonant tank and a secondary winding. A synchronous rectifier (SR) switch is configured to selectively switch current from the secondary winding to supply a rectified current to a load. An RC filter includes a filter capacitor and a filter resistor connected across the SR switch, with the filter capacitor defining a filter capacitor voltage thereacross. A rectifier driver is configured to drive the SR switch to a conductive state in response to the filter capacitor voltage being less than a threshold value.

64. 发明申请

US20220094272A1 DESIGN AND OPTIMIZATION OF A HIGH POWER DENSITY LOW VOLTAGE DC-DC CONVERTER FOR ELECTRIC VEHICLES 有权
公开(公告)号：US20220094272A1
公开(公告)日：2022-03-24
申请号：US17425656
申请日：2020-01-24
申请人： Wenbo LIU , Yang CHEN , Xiang ZHOU , Andrew YUREK , Mojtaba FOROUZESH , Bo SHENG , Sam WEBB , Yan-fei LIU , Lakshmi Varaha IYER , Gerd SCHLAGER , Michael NEUDORFHOFER , Wolfgang BAECK , MAGNA INTERNATIONAL INC.
发明人： Wenbo LIU , Yang CHEN , Xiang ZHOU , Andrew YUREK , Mojtaba FOROUZESH , Bo SHENG , Sam WEBB , Yan-Fei LIU , Lakshmi Varaha IYER , Gerd SCHLAGER , Michael NEUDORFHOFER , Wolfgang BAECK
IPC分类号： H02M3/335 , H01F27/28 , H01F27/40 , H01F30/10 , H02M7/48
摘要： An inductor-inductor-capacitor (EEC) power converter with high efficiency for Electric Vehicle (EV) on-board low voltage DC-DC chargers (LDC) is disclosed. The converter includes a switching bridge with a plurality of bridge switches and configured to generate an output from a direct current input voltage. An EEC tank circuit is coupled to the switching bridge and includes a resonant inductor and a resonant capacitor and a parallel inductor connected between the resonant inductor and the resonant capacitor. The tank circuit is configured to output a resonant sinusoidal current from the output of the switching bridge. At least one transformer has at least one primary winding in parallel with the parallel inductor of the inductor-inductor-capacitor tank circuit and at least one secondary winding. At least one rectifier is coupled to the at least one secondary winding and is configured to output a rectified alternating current.

65. 发明授权

US10855273B2 High-side gate driver for gallium nitride integrated circuits 有权
公开(公告)号：US10855273B2
公开(公告)日：2020-12-01
申请号：US16423138
申请日：2019-05-27
申请人： Zhanming Li , Yan-Fei Liu , Yue Fu , Wai Tung Ng
发明人： Zhanming Li , Yan-Fei Liu , Yue Fu , Wai Tung Ng
IPC分类号： H03K17/30 , H03K17/22 , H03K17/06
摘要： A gate driver circuit for a gallium nitride (GaN) power transistor includes a RS-flipflop that receives a first pulse train at an S input terminal and a second pulse train at an R input terminal, and produces an output pulse train, and an amplifier that amplifies the output pulse train and produces a gate driver signal for the GaN power transistor. The RS-flipflop and the amplifier may be implemented together on a GaN monolithic integrated circuit, optionally together with the GaN power transistor. The GaN power transistor may be a high-side switch of a half-bridge circuit. The RS-flipflop may be implemented with enhancement mode and depletion mode GaN high electron mobility transistors (HEMTs). Embodiments avoid drawbacks of prior hybrid (e.g., silicon-GaN) approaches, such as parasitic inductances from bonding wires and on-board metal traces, especially at high operating frequencies, as well as reduce implementation cost and improve performance.

66. 发明授权

US10686411B2 Gate drivers and voltage regulators for gallium nitride devices and integrated circuits 有权
公开(公告)号：US10686411B2
公开(公告)日：2020-06-16
申请号：US16449356
申请日：2019-06-22
申请人： Zhanming Li , Yue Fu , Yan-Fei Liu
发明人： Zhanming Li , Yue Fu , Yan-Fei Liu
IPC分类号： H03F1/30 , H03F1/52 , H01L29/20 , H01L27/02 , H01L27/06 , H01L29/778 , H03F3/213 , H01L21/8252
摘要： Voltage stabilizing and voltage regulating circuits implemented in GaN HEMT technology provide stable output voltages suitable for use in applications such as GaN power transistor gate drivers and low voltage auxiliary power supplies for GaN integrated circuits. Gate driver and voltage regulator modules include at least one GaN D-mode HEMT (DHEMT) and at least two GaN E-mode HEMTs (EHEMTs) connected together in series, so that the at least one DHEMT operates as a variable resistor and the at least two EHEMTs operate as a Zener diode that limits the output voltage. The gate driver and voltage regulator modules may be implemented as a GaN integrated circuits, and may be monolithically integrated together with other components such as amplifiers and power HEMTs on a single die to provide a GaN HEMT power module IC.

67. 发明申请

US20200099302A1 Zero Inductor Voltage Converter Topology with Improved Switch Utilization 审中-公开
公开(公告)号：US20200099302A1
公开(公告)日：2020-03-26
申请号：US16576995
申请日：2019-09-20
申请人： Samuel Dylan Webb , Yan-Fei Liu
发明人： Samuel Dylan Webb , Yan-Fei Liu
IPC分类号： H02M3/158 , H02M1/08
摘要： A multi-stage, multi-level DC-DC step-down converter includes a first stage and a second stage having two identical cells connected in parallel. The first stage includes an input capacitor, four switches, and one flying capacitor. The two cells of the second stage each include four switches and one flying capacitor, and an output filter. The cells of the second stage are driven at half the switching frequency of the input stage, and provides a step-down ratio of 4:1. A third stage having four cells may be added to achieve a step-down ratio of 8:1, a fourth stage having eight cells may be added to achieve a step-down ration of 16:1, etc., each additional stage including a doubling of the number of cells connected in parallel, with all cells being substantially identical, and each stage operating at a further reduced fraction of the switching frequency. Embodiments are particularly suitable for applications such as a 48V intermediate bus architecture for servers and datacenters.

68. 发明授权

US10498236B2 Two-phase three-level converter and controller therefor 有权
公开(公告)号：US10498236B2
公开(公告)日：2019-12-03
申请号：US15481244
申请日：2017-04-06
申请人： Tianshu Liu , Yan-Fei Liu
发明人： Tianshu Liu , Yan-Fei Liu
IPC分类号： H02M1/08 , H02M3/158
CPC分类号： H02M3/158 , H02M1/08
摘要： Disclosed are multilevel buck converters, and controllers and methods for operating such converters. Embodiments improve the voltage gain (Vo/Vin) of multi-level DC-DC converters, such as three-level converters, that is imposed by a duty cycle limitation in conventional approaches. According to certain embodiments, the duty cycle of switches is controlled to so that the converter output voltage is increased.

69. 发明授权

US10447173B2 Single-phase five-level active clamping converter unit and converter 有权
公开(公告)号：US10447173B2
公开(公告)日：2019-10-15
申请号：US15770493
申请日：2017-03-17
申请人： Hongliang Wang , Yan-Fei Liu
发明人： Hongliang Wang , Yan-Fei Liu
IPC分类号： H02M7/00 , H02M7/487 , H02M7/48 , H02S40/32 , H02M7/537
摘要： A single-phase five-level active clamping converter unit and a converter. The single-phase five-level active clamping converter unit has three input ends and one output end, and also comprises: a suspension capacitor and a topological control portion. The topological control portion is connected to the suspension capacitor and the three input ends and one output end of the single-phase five-level active clamping converter unit, is connected to a plurality of control ends, and is suitable for the supply of at least eight operating modes under the control of a control signal accessing the control ends. In the single-phase five-level active clamping converter unit, a topological structure is easy to design, and is simple and convenient to control.

70. 发明授权

US10388743B2 Power electronic and optoelectronic devices with interdigitated electrodes 有权
公开(公告)号：US10388743B2
公开(公告)日：2019-08-20
申请号：US15783888
申请日：2017-10-13
申请人： Zhanming Li , Yue Fu , Wai Tung Ng , Yan-Fei Liu
发明人： Zhanming Li , Yue Fu , Wai Tung Ng , Yan-Fei Liu
IPC分类号： H01L29/417 , H01L29/40 , H01L29/778 , H01L31/0224 , H01L33/38 , H01L31/108 , H01L33/20
摘要： This invention relates to interdigitated electrodes for power electronic and optoelectronic devices where field and current distribution determine the device performance. Described are geometries based on rounded asymmetrical fingers and electrode bases of varying width. Simulations demonstrate benefits for reducing self-heating and thermal power loss, which reduces overall on-state resistance and increases reverse break down voltages.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式