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1.发明授权System and method for controlling power factor and power converter employing the same 失效用于控制功率因数的系统和方法以及采用该功率因数的功率转换器
公开(公告)号：US6034513A
公开(公告)日：2000-03-07
申请号：US832429
申请日：1997-04-02
CPC分类号： H02M1/4225 , Y02B70/126
摘要： A power factor controller, a method of controlling power factor and a power converter employing either the controller or the method. The controller includes: (1) a ramp circuit that senses an output voltage of a converter being controlled and generates an intermediate waveform that rises as a function of a magnitude of the output voltage and (2) a drive circuit, coupled to the ramp circuit, that senses a current in the converter and causes the intermediate waveform to fall at a time that is a function of a magnitude of the current, the drive circuit generating a drive signal for the converter from the intermediate waveform.
摘要翻译： 功率因数控制器，功率因数控制方法以及使用控制器或方法的功率转换器。 控制器包括：（1）斜坡电路，其检测被控制的转换器的输出电压，并产生作为输出电压的大小的函数上升的中间波形;以及（2）耦合到斜坡电路的驱动电路 ，其感测转换器中的电流，并且使得中间波形在与电流大小的函数的时间下降，驱动电路从中间波形产生用于转换器的驱动信号。
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公开(公告)号：US5764037A
公开(公告)日：1998-06-09
申请号：US756738
申请日：1996-11-26
CPC分类号： H02M1/4208 , H02M3/158 , H02M2001/009 , Y02B70/126 , Y02P80/112
摘要： A split boost converter is disclosed herein, suitable for both single phase and three phase AC input applications. It provides two equal but unparallelable output voltages stored on two separate independent output capacitors. The implementation supports two modes of operation in which two power switches are operated simultaneously or alternately. Each mode maintains the advantage of a reduced boost inductor size. In the first mode the charging of the capacitors in parallel circuits and their discharge in a series connection substantially reduces ripple current in the inductor permitting the user of a smaller inductor. In the second mode the capacitors are charged and discharged in differing time intervals achieving a similar result. The circuit is operable with input voltages which must exceed the voltages of its two output capacitors.
摘要翻译： 本文公开了一种分离升压转换器，适用于单相和三相交流输入应用。 它提供两个相等但不可平行的输出电压存储在两个独立的独立输出电容器上。 该实现支持两种电源开关同时或交替操作的两种操作模式。 每种模式保持降低升压电感器尺寸的优点。 在第一种模式下，并联电路中的电容器的充电及其串联的放电大大减少了电感器中的纹波电流，从而允许用户使用较小的电感器。 在第二模式中，电容器以不同的时间间隔进行充电和放电，实现类似的结果。 该电路的输入电压必须超过其两个输出电容器的电压。
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公开(公告)号：US5949658A
公开(公告)日：1999-09-07
申请号：US982131
申请日：1997-12-01
IPC分类号： H02M3/335
CPC分类号： H02M3/33561
摘要： A multiple output dc to dc converter is described that improves efficiency for auxiliary outputs using a secondary side switch. The converter uses a switching circuit to place an alternating voltage from a dc power source across a transformer. The switching circuit is controlled by a primary PWM controller which regulates the primary output voltage by adjusting the duty cycle of the switching circuit. The switching circuit produces an alternating voltage across the center-tapped winding of the transformer, which is rectified by diodes connected to the winding to create a full-wave output. This output is used by a primary output circuit to create the primary output voltage, and is also used to create an auxiliary output voltage by using a secondary side switch and auxiliary PWM controller to regulate the auxiliary output. A bypass element, which can be a diode, is connected between the transformer and the auxiliary output circuit to bypass the auxiliary switch during one phase of the full wave output cycle, thereby increasing the efficiency of the auxiliary output by eliminating losses due to the switch during that phase. The invention can be used with any common converter topology that uses a full wave type output, including, but not limited to, full-bridge, half-bridge, push-pull, clamped-mode forward converter, or any other topology with a full-wave rectified output.
摘要翻译： 描述了一种多输出直流 - 直流转换器，其提高了使用次级侧开关的辅助输出的效率。 该转换器使用一个开关电路，将直流电源的交流电压放置在变压器上。 开关电路由主PWM控制器控制，该PWM控制器通过调节开关电路的占空比来调节初级输出电压。 开关电路在变压器的中心抽头绕组上产生交流电压，该绕组由连接到绕组的二极管整流以产生全波输出。 该输出由主输出电路用于创建初级输出电压，并且还用于通过使用次级侧开关和辅助PWM控制器来调节辅助输出来产生辅助输出电压。 作为二极管的旁路元件连接在变压器和辅助输出电路之间，以在全波输出周期的一个相位期间旁路辅助开关，从而通过消除开关造成的损耗来提高辅助输出的效率 在这个阶段。 本发明可以与任何使用全波型输出的公共转换器拓扑一起使用，包括但不限于全桥，半桥，推挽，钳位模式正激转换器或具有完整波形的任何其他拓扑 波整流输出。
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