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1. 发明授权

US5652700A Low cost AC-to-DC converter having input current with reduced harmonics 失效
公开(公告)号：US5652700A
公开(公告)日：1997-07-29
申请号：US588054
申请日：1996-01-19
申请人： Fu-Sheng Tsai , Franki Ngai Kit Poon , Francis Man Shuen Ho , Robert Chun Fung Lee
发明人： Fu-Sheng Tsai , Franki Ngai Kit Poon , Francis Man Shuen Ho , Robert Chun Fung Lee
IPC分类号： H02M7/217 , H02M1/00 , H02M1/42 , H02M3/28 , H02M3/335 , H02M7/12
CPC分类号： H02M1/4258 , H02M3/335 , Y02B70/126
摘要： An AC-to-DC power converter achieves greater than 80 percent power factor correction with greater than 75 percent efficiency using only one power switch, only one magnetic component, only one control loop, and a storage capacitor. The only magnetic component is a transformer having first primary winding, a second primary winding, and at least one secondary winding. During a first time interval of the period of the AC input current, the second primary winding is energized with energy previously stored in a storage capacitor. During a second time interval of the period of the AC input current, the first primary winding is energized with energy of an input current flowing through the AC input terminals. As a result, the AC-to-DC power converter drawns input current for an extended period of time before the point in time when the input voltage peaks and also for an extended period of time after the point in time when the input voltage peaks. Magnitudes of input current harmonics with respect to the fundamental input current are therefore reduced with an AC-to-DC power converter having only one magnetic component.

2. 发明授权

US5995383A Low cost AC-to-DC converter having input current with reduced harmonics 失效
标题翻译：具有降低谐波的输入电流的低成本AC-DC转换器
公开(公告)号：US5995383A
公开(公告)日：1999-11-30
申请号：US721497
申请日：1996-09-27
申请人： Franki Ngai Kit Poon , Robert Chun Fung Lee , Fu-Sheng Tsai , Francis Man Shuen Ho
发明人： Franki Ngai Kit Poon , Robert Chun Fung Lee , Fu-Sheng Tsai , Francis Man Shuen Ho
IPC分类号： H02M7/217 , H02M1/00 , H02M1/42 , H02M3/28 , H02M3/335 , H02M7/12
CPC分类号： H02M1/4258 , H02M3/335 , Y02B70/126
摘要： An AC-to-DC power converter draws input current through an inductor. When the input voltage of the converter is sufficiently high and the switch of the converter is on, current flows into the converter, through the inductor, to the tap of a transformer, through a first primary winding of the transformer, and through the switch. When the switch is then turned off, current continues to flow through the inductor and to the tap of the transformer but then flows through a second primary of the transformer and into a storage capacitor. Energy stored in the storage capacitor is transferred to the load when it is not possible to obtain sufficient energy from the input current to supply the load. The AC-to-DC converter has very few circuit components and low input current harmonics.
摘要翻译： AC-DC电源转换器通过电感器吸取输入电流。当转换器的输入电压足够高并且转换器的开关导通时，电流通过电感器通过变压器的第一初级绕组和通过开关流入转换器，变压器的抽头。当开关然后关断时，电流继续流过电感器和变压器的抽头，然后流过变压器的第二级并进入存储电容器。存储在存储电容器中的能量在不能从输入电流获得足够的能量以供应负载时被传送到负载。 AC到DC转换器具有非常少的电路组件和低输入电流谐波。

3. 发明授权

US5751561A Low cost AC-to-DC converter having input current with reduced harmonics 失效
标题翻译：具有降低谐波的输入电流的低成本AC-DC转换器
公开(公告)号：US5751561A
公开(公告)日：1998-05-12
申请号：US794755
申请日：1997-02-03
申请人： Francis Man Shuen Ho , Robert Chun Fung Lee
发明人： Francis Man Shuen Ho , Robert Chun Fung Lee
IPC分类号： H02M1/00 , H02M1/42 , H02M3/335
CPC分类号： H02M1/4258 , H02M3/335 , Y02B70/126
摘要： An AC-to-DC power converter achieves greater than 80 percent power factor correction with greater than 75 percent efficiency using only one power switch, only one magnetic component, only one control loop, and a storage capacitor. The only magnetic component is a transformer having first primary winding, a second primary winding, and at least one secondary winding. During a first time interval of the period of the AC input current, the second primary winding is energized with energy previously stored in a storage capacitor. During a second time interval of the period of the AC input current, the first primary winding is energized with energy of an input current flowing through the AC input terminals. As a result, the AC-to-DC power converter drawns input current for an extended period of time before the point in time when the input voltage peaks and also for an extended period of time after the point in time when the input voltage peaks. Magnitudes of input current harmonics with respect to the fundamental input current are therefore reduced with an AC-to-DC power converter having only one magnetic
摘要翻译： AC-DC电源转换器仅使用一个电源开关，只有一个磁性元件，只有一个控制回路和一个存储电容器，实现了大于80％的功率因数校正，效率高于75％。唯一的磁性部件是具有第一初级绕组，第二初级绕组和至少一个次级绕组的变压器。在AC输入电流的周期的第一时间间隔期间，第二初级绕组通过预先存储在存储电容器中的能量来通电。在AC输入电流的周期的第二时间间隔期间，通过流过AC输入端的输入电流的能量来激励第一初级绕组。结果，AC-DC电源转换器在输入电压峰值的时间点之前的延长的时间段以及在输入电压峰值的时间点之后的延长的时间段内绘制输入电流。因此，相对于基波输入电流的输入电流谐波的幅度随着具有仅一个磁性的AC-DC转换器而减小

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