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1.发明授权General self-driven synchronous rectification scheme for synchronous rectifiers having a floating gate 有权具有浮动栅极的同步整流器的一般自驱动同步整流方案公开(公告)号：US06256214B1
公开(公告)日：2001-07-03
申请号：US09267155
申请日：1999-03-11
IPC分类号： H02M7217
CPC分类号： H02M1/38 , H02M3/33592 , Y02B70/1475
摘要： A self-driven synchronous rectifier circuit having synchronous rectifiers with floating gates for a power converter or signal transformer. The circuit comprises a transformer (49, 70) having a secondary winding with a first and second terminal, a first synchronous rectifier (SQ1) coupled to the first transformer secondary winding first terminal and having a control terminal floating relative to ground and a first drive circuit coupled to the first synchronous rectifier floating control terminal and controlling the first synchronous rectifier. A first control signal is coupled to the first drive circuit, where the first control signal controls the first drive circuit as a function of a polarity reversal of a voltage across the first transformer (49, 70). A second synchronous rectifier (SQ2) is coupled to the first transformer secondary winding second terminal and has a control terminal floating relative to ground. A second drive circuit is coupled to the second synchronous rectifier floating control terminal and controls the second synchronous rectifier. A second control signal is coupled to the second drive circuit, where the second control signal controls the second drive circuit as a function of a polarity reversal of a voltage across the first transformer (49, 70).
摘要翻译： 具有用于功率转换器或信号变压器的具有浮动栅极的同步整流器的自驱动同步整流电路。 该电路包括具有第一和第二端子的次级绕组的变压器（49,70），耦合到第一变压器次级绕组第一端子并且具有相对于地面浮动的控制端子的第一同步整流器（SQ1）和第一驱动器 电路耦合到第一同步整流器浮动控制端并控制第一同步整流器。 第一控制信号耦合到第一驱动电路，其中第一控制信号根据第一变压器（49,70）两端的电压的极性反转来控制第一驱动电路。 第二同步整流器（SQ2）耦合到第一变压器次级绕组第二端子并且具有相对于地相互漂浮的控制端子。 第二驱动电路耦合到第二同步整流器浮动控制端子并控制第二同步整流器。 第二控制信号耦合到第二驱动电路，其中第二控制信号根据第一变压器（49,70）两端的电压的极性反转来控制第二驱动电路。
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2.发明授权Method of connecting synchronous rectifier modules in parallel without output voltage faults 有权并联连接同步整流模块的方法，无输出电压故障公开(公告)号：US06459600B2
公开(公告)日：2002-10-01
申请号：US09772098
申请日：2001-01-27
IPC分类号： H02M2127
CPC分类号： H02J1/102 , H02M3/33592 , Y02B70/1475
摘要： The present invention provides a method for preventing a fault condition in a DC-DC converter (10, 20, 50) having a first secondary winding (Ns1) coupled to a first synchronous rectifier (SQ1) and a second secondary winding (Ns2) coupled to a second synchronous rectifier (SQ2). The first synchronous rectifier (SQ1) is turned on based on a voltage across the first secondary winding (Ns1) and is turned off based on a first driver signal. The second synchronous rectifier (SQ2) is turned on based on a voltage across the second secondary winding (Ns2) and is turned off based on a second driver signal. The present invention also provides a DC-DC converter (10, 20, 50) wherein a first control circuit is coupled to and controls the first synchronous rectifier (SQ1) pursuant to the method described above, and a second control circuit is coupled to and controls the second synchronous rectifier (SQ2) pursuant to the method described above.
摘要翻译： 本发明提供了一种用于防止具有耦合到第一同步整流器（SQ1）和第二次级绕组（Ns2）的第二次级绕组（Ns1）的DC-DC转换器（10,20,50）中的故障状态的方法， 到第二同步整流器（SQ2）。 第一同步整流器（SQ1）基于第一次级绕组（Ns1）两端的电压而导通，并基于第一驱动器信号而断开。 第二同步整流器（SQ2）基于第二次级绕组（Ns2）两端的电压而导通，并基于第二驱动器信号而断开。 本发明还提供了一种DC-DC转换器（10,20,50），其中根据上述方法将第一控制电路耦合到第一同步整流器（SQ1）并控制第一同步整流器（SQ1），并且第二控制电路耦合到 根据上述方法控制第二同步整流器（SQ2）。
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公开(公告)号：US06166927A
公开(公告)日：2000-12-26
申请号：US361023
申请日：1999-07-23
CPC分类号： H02M3/337
摘要： A push-pull converter for converting an input voltage to a selectable output voltage is disclosed. The push-pull converter includes a pair of primary switches and a pair of primary windings of a transformer. The voltage stress across the primary switches is regulated by means of a clamp capacitor. The clamp capacitor clamps the voltage of the primary switches during the reset of the primary windings of the transformer. An alternate embodiment is also disclosed in which the voltage stress across the primary switches is regulated by means of two clamp capacitors. The clamp capacitor clamps the voltage of the primary switches during the reset of the primary windings of the transformer. The clamp capacitors extend the transformer reset period to include the lagging dead time for the corresponding switches, as well as the complementary powering stage. Current in the output section during the dead times is permitted by means of an additional diode, therein.
摘要翻译： 公开了一种用于将输入电压转换为可选输出电压的推挽转换器。 推挽转换器包括一对初级开关和一对变压器的初级绕组。 主开关两端的电压应力通过钳位电容来调节。 在变压器的初级绕组复位期间，钳位电容器钳位初级开关的电压。 还公开了一种替代实施例，其中通过两个钳位电容器来调节初级开关两端的电压应力。 在变压器的初级绕组复位期间，钳位电容器钳位初级开关的电压。 钳位电容器将变压器复位周期延长，以包括相应开关的滞后死区时间，以及互补供电阶段。 在死区期间输出部分的电流通过附加二极管在其中被允许。
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公开(公告)号：US6038148A
公开(公告)日：2000-03-14
申请号：US209733
申请日：1998-12-11
申请人： Richard W. Farrington , Jun Zhang , William Hart
发明人： Richard W. Farrington , Jun Zhang , William Hart
CPC分类号： H02M1/38 , H02M3/33592 , Y02B70/1475
摘要： A self-driven synchronous rectifier circuit (42) for a power converter. The circuit comprises a transformer (49, 70) having a secondary winding with a first and second terminal, a first synchronous rectifier (14) coupled to the second transformer terminal and having a control terminal, and a second synchronous rectifier (16) coupled to the first transformer terminal and having a control terminal. The circuit (42) also comprises a first switch (44) coupled to the first synchronous rectifier (14) control terminal, and a second switch (46) coupled to the second synchronous rectifier (16) control terminal. The first (44) and second switch (46) are also coupled to the secondary winding. Switching transitions of the first (14) and second (16) synchronous rectifiers are initiated by a polarity reversal of the voltage of the secondary transformer winding.
摘要翻译： 一种用于功率转换器的自驱动同步整流电路（42）。 电路包括具有第一和第二端子的次级绕组的变压器（49,70），耦合到第二变压器端子并具有控制端子的第一同步整流器（14）和耦合到第二同步整流器 第一变压器端子并具有控制端子。 电路（42）还包括耦合到第一同步整流器（14）控制端子的第一开关（44）和耦合到第二同步整流器（16）控制端子的第二开关（46）。 第一（44）和第二开关（46）也耦合到次级绕组。 第一（14）和第二（16）同步整流器的开关跃迁由次级变压器绕组的电压的极性反转引起。
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公开(公告)号：US06188592B1
公开(公告)日：2001-02-13
申请号：US09434777
申请日：1999-11-05
IPC分类号： H02M324
CPC分类号： H02M3/33592 , Y02B70/1475
摘要： A self-driven synchronous rectifier circuit (50) for a DC—DC power converter. The circuit comprises a primary transformer (16), a first synchronous rectifier (SQ1) coupled to the primary transformer (16), a second synchronous rectifier (SQ2) coupled to the primary transformer (16), an external drive circuit (18). The circuit (50) also comprises a plurality of switches (SQ3, SQ4) controllably coupled to second synchronous rectifier (SQ2). The external drive circuit (18) provides turn-off signaling for both synchronous rectifiers (SQ1, SQ2) Turn-on signaling provided for first synchronous rectifier (SQ1) by the primary transformer (16) turn-on signaling for second synchronous rectifier (SQ2) is provided by the external drive circuit (18).
摘要翻译： 一种用于DC-DC电力转换器的自驱动同步整流电路（50）。 电路包括初级变压器（16），耦合到初级变压器（16）的第一同步整流器（SQ1），耦合到初级变压器（16）的第二同步整流器（SQ2），外部驱动电路（18）。 电路（50）还包括可控地耦合到第二同步整流器（SQ2）的多个开关（SQ3，SQ4）。 外部驱动电路（18）为同步整流器（SQ1，SQ2）提供关断信号。主变压器（16）为第一同步整流器（SQ1）提供的接通信号用于第二同步整流器（SQ2 ）由外部驱动电路（18）提供。
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公开(公告)号：US08149597B2
公开(公告)日：2012-04-03
申请号：US12870326
申请日：2010-08-27
IPC分类号： H02M3/335
CPC分类号： H02M3/33592 , H02M2001/008 , Y02B70/1475 , Y10T307/406
摘要： A dc-dc converter system comprises a quasi-regulated bus converter and plural regulation stages that regulate the output of the bus converter. The bus converter has at least one controlled rectifier with a parallel uncontrolled rectifier. A control circuit controls the controlled rectifier to cause a normally non-regulated mode of operation through a portion of an operating range of source voltage and a regulated output during another portion. The bus converter may be an isolation stage having primary and secondary transformer winding circuits. For the non-regulated output, each primary winding has a voltage waveform with a fixed duty cycle. The fixed duty cycle causes substantially uninterrupted flow of power during non-regulated operation. Inductors at the bus converter input and in a filter at the output of the bus converter may saturate during non-regulated operation.
摘要翻译： 一个dc-dc转换器系统包括准调节总线转换器和多个调节总线转换器输出的调节级。 总线转换器具有至少一个具有并联不可控整流器的受控整流器。 控制电路控制可控整流器通过源电压的工作范围的一部分和另一部分的稳压输出引起正常的非调节工作模式。 总线转换器可以是具有初级和次级变压器绕组电路的隔离级。 对于非稳压输出，每个初级绕组具有固定占空比的电压波形。 固定占空比在非调节操作期间导致基本上不间断的电力流动。 在总线转换器输入端和总线转换器输出端的滤波器中的电感器可能在非调节操作期间饱和。
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7.发明授权Current mode controller for continuous conduction mode power factor correction circuit and method of operation thereof 失效连续导通模式功率因数校正电路的电流模式控制器及其操作方法
公开(公告)号：US5912549A
公开(公告)日：1999-06-15
申请号：US905105
申请日：1997-08-01
CPC分类号： H02M1/4225 , Y02B70/126 , Y02P80/112
摘要： For use with a power factor correction circuit, a current mode controller, a method of operating current mode control to achieve power factor correction thereof and a power supply incorporating the controller or the method. In one embodiment, the controller includes: (1) a modulator, coupled to a switch in the power factor correction circuit, that senses an electrical characteristic and a current passing through the power factor correction circuit and provides, in response thereto, a control signal to the switch and (2) a compensation circuit, coupled to an input of the power factor correction circuit, that provides a compensation signal to the modulator that is a function of a rectified line voltage provided to the input of the power factor correction circuit. The compensation signal causes the modulator to modify the control signal to reduce a total harmonic distortion (THD) of the power factor correction circuit.
摘要翻译： 用于功率因数校正电路，电流模式控制器，操作电流模式控制以实现其功率因数校正的方法和结合该控制器或方法的电源。 在一个实施例中，控制器包括：（1）耦合到功率因数校正电路中的开关的调制器，其感测通过功率因数校正电路的电特性和电流，并响应于此提供控制信号 和（2）补偿电路，其耦合到功率因数校正电路的输入，该补偿电路为调制器提供补偿信号，该补偿信号是提供给功率因数校正电路的输入的整流线电压的函数。 补偿信号使调制器修改控制信号，以降低功率因数校正电路的总谐波失真（THD）。
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公开(公告)号：US5883793A
公开(公告)日：1999-03-16
申请号：US69909
申请日：1998-04-30
IPC分类号： H02M3/335
CPC分类号： H02M3/33569
摘要： For use with a power converter having first and second power switches coupled between a converter input and a primary winding of a transformer to impress an input voltage across the primary winding, a voltage clamp circuit for, and method of, resetting the transformer and a power converter employing the clamp circuit or the method. In one embodiment, the clamp circuit includes: (1) first and second reset windings coupled between the first and second power switches, (2) first and second energy storage devices coupled between the primary winding and the first and second reset windings, respectively, and (3) first and second switching circuits, coupled to the first reset winding and the second reset winding, respectively, that provide an electrical path from the primary winding to the converter input through the first and second reset windings, respectively, when the first and second power switches are not conducting.
摘要翻译： 为了与功率转换器一起使用，该功率转换器具有耦合在变压器输入端和变压器的初级绕组之间的第一和第二功率开关，以在一次绕组上施加输入电压，用于复位变压器的电压钳位电路和复位方法以及功率 转换器采用钳位电路或方法。 在一个实施例中，钳位电路包括：（1）耦合在第一和第二功率开关之间的第一和第二复位绕组，（2）分别耦合在初级绕组和第一和第二复位绕组之间的第一和第二能量存储装置， 和（3）分别耦合到第一复位绕组和第二复位绕组的第一和第二开关电路，当第一和第二开关电路分别通过第一和第二复位绕组提供从初级绕组到转换器输入的电路， 并且第二电源开关不导通。
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9.发明授权Asymmetrical half-bridge converter having adjustable parasitic resistances to offset output voltage DC bias 失效具有可调寄生电阻以偏移输出电压DC偏置的非对称半桥转换器
公开(公告)号：US5870291A
公开(公告)日：1999-02-09
申请号：US936986
申请日：1997-09-25
申请人： Richard W. Farrington , Mark E. Jacobs , Rui Liu
发明人： Richard W. Farrington , Mark E. Jacobs , Rui Liu
IPC分类号： H02M3/335
CPC分类号： H02M3/33569
摘要： An asymmetrical half-bridge converter, a method of operating the same and a power supply that incorporates either the converter or the method. In one embodiment, the converter includes: (1) a power transformer that receives asymmetrical AC input power into a primary winding thereof via an input capacitor, the asymmetrical AC input power inducing a DC bias current in a secondary winding of the power transformer and (2) first and second serially-coupled output inductors coupled across the secondary winding and having parasitic resistances associated therewith that are independently selectable to attenuate the DC bias circuit in the secondary winding.
摘要翻译： 不对称半桥转换器，其操作方法以及包含转换器或方法的电源。 在一个实施例中，转换器包括：（1）电源变压器，其经由输入电容器将不对称的AC输入功率接收到其初级绕组中，所述非对称AC输入功率引起所述电力变压器的次级绕组中的DC偏置电流， 2）耦合在次级绕组两端并具有与其相关联的寄生电阻的第一和第二串联耦合的输出电感器，其独立地可选择以衰减次级绕组中的DC偏置电路。
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公开(公告)号：US5457379A
公开(公告)日：1995-10-10
申请号：US137682
申请日：1993-10-15
摘要： A switching boost regulator, including auxiliary circuitry having an auxiliary switch and inductor connected to operate the regulator in a zero-voltage transition mode, achieves substantial efficiency improvement by limiting losses in the auxiliary circuitry dedicated to achieving zero-voltage transition operation. Loss reduction circuitry included with the auxiliary circuitry cooperatively operates to limit turn-on and conduction losses and to suppress ringing of the components of the auxiliary circuit.
摘要翻译： 开关升压调节器包括具有辅助开关和电感器的辅助电路，其连接以在零电压转换模式下操作调节器，通过限制专用于实现零电压转换操作的辅助电路中的损耗来实现显着的效率提高。 辅助电路所包括的减少损耗电路协同工作，以限制导通和导通损耗，并抑制辅助电路的组件振铃。
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