公开(公告)号：US08054058B2

公开(公告)日：2011-11-08

申请号：US12081578

申请日：2008-04-17

申请人： Yan-Fei Liu ,  Eric Meyer

发明人： Yan-Fei Liu ,  Eric Meyer

IPC分类号： G05F1/565 ,  G05G1/595

CPC分类号： H02M3/1588 ,  Y02B70/1466

摘要： The invention relates to a control method and a controller for a DC-DC converter, such as a synchronous Buck converter, which exploits the principle of capacitor charge balance to allow the converter to recover from a positive and/or negative load current step in the shortest achievable time, with the lowest possible voltage undershoot/overshoot. The control method may be implemented by either an analog or a digital circuit. The controller may be integrated with existing controller schemes (such as voltage-mode controllers) to provide superior dynamic performance during large-signal transient conditions while providing stable operation during steady state conditions. The invention also relates to a method and a modification of a DC-DC converter topology that comprises connecting a controlled current source between an input terminal and an output terminal of the DC-DC converter; detecting a load current step to a new load current; modifying a duty cycle of the DC-DC converter; and modifying current through a parallel output capacitor of the DC-DC converter by controlling current of the current source. The methods and circuits provided herein are applicable to Buck converters and Buck-derived converters such as forward, push-pull, half-bridge, and full-bridge converters.

摘要翻译： 本发明涉及一种用于DC-DC转换器的控制方法和控制器，例如同步降压转换器，其利用电容器电荷平衡的原理来允许转换器从正，负负载电流步骤中恢复 最短可实现的时间，最低可能的电压下冲/过冲。 控制方法可以由模拟或数字电路来实现。 控制器可以与现有的控制器方案（例如电压模式控制器）集成，以在大信号瞬态条件下提供优异的动态性能，同时在稳态条件下提供稳定的操作。 本发明还涉及DC-DC转换器拓扑的方法和修改，其包括在DC-DC转换器的输入端和输出端之间连接受控电流源; 检测负载电流步长到新的负载电流; 修改DC-DC转换器的占空比; 以及通过控制电流源的电流来修改DC-DC转换器的并联输出电容器的电流。 本文提供的方法和电路适用于降压转换器和降压型转换器，例如正向，推挽，半桥和全桥转换器。

公开(公告)号：US20110101951A1

公开(公告)日：2011-05-05

申请号：US12610097

申请日：2009-10-30

申请人： Zhiliang Zhang ,  Yan-Fei Liu

发明人： Zhiliang Zhang ,  Yan-Fei Liu

IPC分类号： G05F3/08

CPC分类号： H02M3/3376 ,  H02M3/33592 ,  H02M2001/0064 ,  Y02B70/1475

摘要： non-isolated full bridge (FB) converters have self-driven synchronous rectifier (SR) MOSFETs in the current doubler rectifier (CDR). The gate terminals of the SR MOSFETs are connected to the bridge leg midpoints of the FB converter. The primary side of the FB converter shares the same ground of the secondary side, which provides the gate drive path for the SRs. The asymmetrical control featuring zero-voltage-switching (ZVS) capability is applied to the two bridge legs of the FB converter respectively. This creates the right gate drive voltage waveforms for the SRs. The energy of the leakage inductance of the transformer is used to achieve SR gate energy recovery. High gate drive voltages can be used to reduce the on-resistance of SRs and the conduction loss. In this way, no additional gate driver circuitry is needed for the SRs compared to the conventional external drive circuitry for SRs. In this invention, the above features provide high conversion efficiency with high switching frequency. This can help to achieve high power density and fast dynamic response accordingly. The invented power circuits are suitable to low voltage and high current application.

摘要翻译： 非隔离全桥（FB）转换器在电流倍增整流器（CDR）中具有自驱动同步整流（SR）MOSFET。 SR MOSFET的栅极端子连接到FB转换器的桥脚中点。 FB转换器的初级侧共享二次侧相同的地，为SR提供栅极驱动路径。 具有零电压切换（ZVS）能力的非对称控制分别应用于FB转换器的两个桥臂。 这为SR创建了正确的栅极驱动电压波形。 变压器漏电的能量用于实现SR栅极能量回收。 可以使用高栅极驱动电压来降低SR的导通电阻和导通损耗。 以这种方式，与用于SR的常规外部驱动电路相比，SR不需要额外的栅极驱动器电路。 在本发明中，上述特征提供了高切换频率的高转换效率。 这有助于相应地实现高功率密度和快速的动态响应。 本发明的电源电路适用于低电压和高电流应用。

公开(公告)号：US20100038967A1

公开(公告)日：2010-02-18

申请号：US12581581

申请日：2009-10-19

申请人： Raymond K. Orr ,  Yan-Fei Liu

发明人： Raymond K. Orr ,  Yan-Fei Liu

IPC分类号： H02J1/00

CPC分类号： H02J1/102 ,  H02J1/10 ,  Y10T307/32 ,  Y10T307/344 ,  Y10T307/642

摘要： Distributed power supply arrangements and related methods are disclosed. Voltage is sensed at least one sense point in a power plane of a power distribution network. The power plane includes distributed source points and load points through which a plurality of power sources supply power to a plurality of loads. Currents supplied to the power plane by the power sources are regulated based on the voltage sensed at each of the at least one sense point.

摘要翻译： 公开了分布式电源装置和相关方法。 在配电网的电源平面中检测电压至少一个感测点。 电力平面包括分布式源点和负载点，多个电源通过该负载点向多个负载供电。 基于在所述至少一个感测点中的每一个感测到的电压来调节由所述电源供应到所述电力平面的电流。

公开(公告)号：US07598792B2

公开(公告)日：2009-10-06

申请号：US11266486

申请日：2005-11-04

申请人： Yan-Fei Liu ,  Zhihua Yang ,  Wilson Eberle

发明人： Yan-Fei Liu ,  Zhihua Yang ,  Wilson Eberle

IPC分类号： H03K17/74

CPC分类号： H02M1/088 ,  H02M1/08 ,  H02M3/33592 ,  H02M3/3376 ,  Y02B70/1433 ,  Y02B70/1475

摘要： A resonate gate drive circuit for driving at least one power switching device recovers energy loss for charging and discharging the gate capacitance of the power switching devices. The gate drive circuit uses a current source to charge and discharge the gate capacitance with a high current, reducing the switching loss of the power switching device. The gate drive circuit comprises four semiconductor bidirectional conducting switching devices connected in a full-bridge configuration. An inductor connected across the bridge configuration provides the current source. The gate drive circuit may be used in single and dual high-side and low-side, symmetrical or complementary, power converter gate drive applications.

摘要翻译： 用于驱动至少一个功率开关装置的谐振栅极驱动电路恢复能量损耗，以便对功率开关器件的栅极电容进行充电和放电。 栅极驱动电路使用电流源以高电流对栅极电容进行充电和放电，从而降低功率开关器件的开关损耗。 栅极驱动电路包括以全桥配置连接的四个半导体双向导通开关器件。 通过桥接配置连接的电感器提供电流源。 栅极驱动电路可用于单和双高侧，低边，对称或互补的功率转换器栅极驱动应用。

公开(公告)号：US07453292B2

公开(公告)日：2008-11-18

申请号：US11593129

申请日：2006-11-06

申请人： Yan-Fei Liu ,  Kai Xu

发明人： Yan-Fei Liu ,  Kai Xu

IPC分类号： H03K3/00

CPC分类号： H03K17/04123 ,  H03K17/693 ,  H03K2217/0036

摘要： This invention relates to a resonant gate drive circuit for a power switching device, such as a MOSFET, that uses a center-tapped transformer to increase the driving gate voltage approximately twice as high as the supply voltage. The gate capacitance of the power switching device is charged and discharged by a constant current source, which increases the switching transition speed of the power switch. The circuit is suitable for driving a pair of low side switches with 50% duty cycle or less, such as in a variable frequency resonant converter, push-pull converter, or the like.

摘要翻译： 本发明涉及一种用于诸如MOSFET的功率开关器件的谐振栅极驱动电路，其使用中心抽头变压器来增加大约是电源电压两倍的驱动栅极电压。 电源开关器件的栅极电容由恒流源充电和放电，这增加了电源开关的开关转换速度。 该电路适用于驱动具有50％占空比或更小的一对低侧开关，例如在可变频率谐振转换器，推挽转换器等中。

公开(公告)号：US07307857B2

公开(公告)日：2007-12-11

申请号：US11504775

申请日：2006-08-16

申请人： Yan-Fei Liu ,  Sheng Ye

发明人： Yan-Fei Liu ,  Sheng Ye

IPC分类号： H02M3/335

CPC分类号： H02M3/1584 ,  H02M3/158 ,  H02M3/1588 ,  H02M3/28 ,  H02M3/285 ,  Y02B70/1425 ,  Y02B70/1466

摘要： DC-DC converters have high side and rectifier circuits, and output capacitor. High side circuit connects between input voltage and output voltage, and has primary winding and auxiliary section that operate transformer properly. Auxiliary may have switches or combination of switches and capacitors. High side circuit converts electrical into magnetic energy through transformer primary, which is then transferred to output through rectifier circuit. It also transfers energy directly to output voltage. Converters have high efficiency, fast dynamic response and high current output. Converters can have large duty cycle and large input voltage and output voltage conversion ratio. High side circuit can be half-bridge, full-bridge or forward converter. Rectifier uses inductors on either side of the secondary, and diodes or synchronous rectifiers, to rectify output voltage. Multi-phase interleaved circuits utilize shared switches to reduce size. High side circuit can utilize resonant tank to decrease switching losses in auxiliary.

公开(公告)号：US20070103941A1

公开(公告)日：2007-05-10

申请号：US11504775

申请日：2006-08-16

申请人： Yan-Fei Liu ,  Sheng Ye

发明人： Yan-Fei Liu ,  Sheng Ye

IPC分类号： H02M3/335

CPC分类号： H02M3/1584 ,  H02M3/158 ,  H02M3/1588 ,  H02M3/28 ,  H02M3/285 ,  Y02B70/1425 ,  Y02B70/1466

摘要： DC-DC converters have high side and rectifier circuits, and output capacitor. High side circuit connects between input voltage and output voltage, and has primary winding and auxiliary section that operate transformer properly. Auxiliary may have switches or combination of switches and capacitors. High side circuit converts electrical into magnetic energy through transformer primary, which is then transferred to output through rectifier circuit. It also transfers energy directly to output voltage. Converters have high efficiency, fast dynamic response and high current output. Converters can have large duty cycle and large input voltage and output voltage conversion ratio. High side circuit can be half-bridge, full-bridge or forward converter. Rectifier uses inductors on either side of the secondary, and diodes or synchronous rectifiers, to rectify output voltage. Multi-phase interleaved circuits utilize shared switches to reduce size. High side circuit can utilize resonant tank to decrease switching losses in auxiliary.

摘要翻译： DC-DC转换器具有高边和整流电路以及输出电容。 高侧电路连接输入电压和输出电压，并具有正常工作变压器的初级绕组和辅助部分。 辅助设备可以有开关或开关和电容器的组合。 高侧电路通过变压器初级将电能转换为磁能，然后通过整流电路传输到输出。 它还可以将能量直接传输到输出电压。 转换器效率高，动态响应快，电流输出高。 转换器可以具有较大的占空比和较大的输入电压和输出电压转换比。 高侧电路可以是半桥，全桥或正转换器。 整流器在二次侧和二极管或同步整流器的任一侧使用电感器来整流输出电压。 多相交错电路利用共享交换机来减小大小。 高侧电路可以利用谐振槽来减少辅助开关损耗。

公开(公告)号：US20060170043A1

公开(公告)日：2006-08-03

申请号：US11266486

申请日：2005-11-04

申请人： Yan-Fei Liu ,  Zhihua Yang ,  Wilson Eberle

发明人： Yan-Fei Liu ,  Zhihua Yang ,  Wilson Eberle

IPC分类号： H01L29/76 ,  H01L29/94

CPC分类号： H02M1/088 ,  H02M1/08 ,  H02M3/33592 ,  H02M3/3376 ,  Y02B70/1433 ,  Y02B70/1475

摘要： A resonate gate drive circuit for driving at least one power switching device recovers energy loss for charging and discharging the gate capacitance of the power switching devices. The gate drive circuit uses a current source to charge and discharge the gate capacitance with a high current, reducing the switching loss of the power switching device. The gate drive circuit comprises four semiconductor bidirectional conducting switching devices connected in a full-bridge configuration. An inductor connected across the bridge configuration provides the current source. The gate drive circuit may be used in single and dual high-side and low-side, symmetrical or complementary, power converter gate drive applications.

公开(公告)号：US06771518B2

公开(公告)日：2004-08-03

申请号：US10227507

申请日：2002-08-26

申请人： Raymond K Orr ,  Yan-Fei Liu

发明人： Raymond K Orr ,  Yan-Fei Liu

IPC分类号： H02M3335

CPC分类号： H02M3/33561 ,  H02M3/005 ,  H02M3/33576

摘要： In a DC converter, a transformer has a first winding coupled in series with a first capacitor and a first switch between a first pair of terminals, and a second winding coupled in series with a second capacitor and an inductor between a second pair of terminals. A second switch is coupled in parallel with the series-connected first winding and first capacitor. A third switch or diode is coupled in parallel with the series-connected second winding and second capacitor. The capacitors provide energy transfer in either direction via the transformer. Leakage inductance of the transformer facilitates zero voltage switching conditions, and the transformer core is reset in each cycle by charge balancing between the capacitors. The switches can comprise AC switches. The transformer can be an autotransformer.

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。