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31. 发明授权

US07272021B2 Power converter with isolated and regulated stages 有权
标题翻译：电源转换器具有隔离和调节级
公开(公告)号：US07272021B2
公开(公告)日：2007-09-18
申请号：US11407699
申请日：2006-04-20
申请人： Martin F. Schlecht , Richard W. Farrington
发明人： Martin F. Schlecht , Richard W. Farrington
IPC分类号： H02M3/335
CPC分类号： H02M3/33561 , H02M3/33592 , Y02B70/1475
摘要： In a power converter, the duty cycle of a primary winding circuit causes near continuous flow of power through the primary and secondary winding circuits during normal operation. By providing no regulation during normal operation, a very efficient circuit is obtained with a synchronous rectifier in the secondary operating at all times. However, during certain conditions such as start up or a short-circuit, the duty cycle of the primary may be reduced to cause freewheeling periods. A normally non-regulating isolation stage may be followed by plural non-isolating regulation stages. To simplify the gate drive, the synchronous rectifiers may be allowed to turn off for a portion of the cycle when the duty cycle is reduced. A filter inductance of the secondary winding circuit is sufficient to minimize ripple during normal operation, but allows large ripple when the duty cycle is reduced. By accepting large ripple during other than normal operation, a smaller filter inductance can be used.
摘要翻译：在功率转换器中，初级绕组电路的占空比在正常工作期间通过初级绕组电路和次级绕组电路产生近乎连续的电力流动。通过在正常工作期间不提供调节，在二次操作中始终可以使用同步整流器获得非常有效的电路。然而，在诸如启动或短路的某些条件下，初级的占空比可以减小以产生续流周期。正常非调节隔离阶段之后可以是多个非隔离调节阶段。为了简化栅极驱动，当占空比减小时，同步整流器可以被允许关闭周期的一部分。次级绕组电路的滤波电感足以在正常工作期间最小化纹波，但是当占空比减小时允许较大的纹波。通过在正常工作以外接受大的纹波，可以使用较小的滤波电感。

32. 发明授权

US07119524B2 Control of DC/DC converters having synchronous rectifiers 有权
标题翻译：具有同步整流器的DC / DC转换器的控制
公开(公告)号：US07119524B2
公开(公告)日：2006-10-10
申请号：US10910235
申请日：2004-08-03
申请人： Joshua H. Bretz , Abram P. Dancy , Leif E. LaWhite , Martin F. Schlecht
发明人： Joshua H. Bretz , Abram P. Dancy , Leif E. LaWhite , Martin F. Schlecht
IPC分类号： G05F1/44 , G05F1/573
CPC分类号： H02M1/32 , H02J1/102 , H02M1/36 , H02M3/1584 , H02M3/33592 , Y02B70/1475
摘要： A DC to DC power converter includes synchronous rectifiers which respond to a control waveform. Negative current from a load into the power converter is prevented by increasing the converter output voltage at a minimum current limit. The synchronous rectifiers may be held off in response to decision logic by activation of a hold-off circuit connected to a control terminal of a synchronous rectifier or of an ORing transistor at the converter output. When the synchronous rectifier is subsequently enabled, its control waveform may be increased slowly relative to the switching cycle.
摘要翻译： DC到DC电力转换器包括对控制波形做出响应的同步整流器。通过将转换器输出电压增加到最小电流限制来防止从负载到功率转换器的负电流。响应于决定逻辑，同步整流器可以通过激活连接到同步整流器的控制端子或转换器输出端的ORing晶体管的保持电路来保持。当同步整流器随后使能时，其控制波形可能相对于开关周期缓慢增加。

33. 发明授权

US07072190B2 High efficiency power converter 有权
公开(公告)号：US07072190B2
公开(公告)日：2006-07-04
申请号：US10812314
申请日：2004-03-29
申请人： Martin F. Schlecht
发明人： Martin F. Schlecht
IPC分类号： H02M3/335
CPC分类号： H02M3/335 , H02J1/102 , H02M3/33592 , H02M3/3372 , H02M3/3374 , H02M2001/007 , Y02B70/1475
摘要： A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.

34. 发明授权

US06894468B1 Control of DC/DC converters having synchronous rectifiers 有权
标题翻译：具有同步整流器的DC / DC转换器的控制
公开(公告)号：US06894468B1
公开(公告)日：2005-05-17
申请号：US09611383
申请日：2000-07-07
申请人： Joshua H. Bretz , Abram P. Dancy , Leif E. LaWhite , Martin F. Schlecht
发明人： Joshua H. Bretz , Abram P. Dancy , Leif E. LaWhite , Martin F. Schlecht
IPC分类号： H02J1/10 , H02M1/00 , H02M1/32 , H02M3/158 , H02M3/335 , G05F1/40 , G05F1/56
CPC分类号： H02M1/32 , H02J1/102 , H02M1/36 , H02M3/1584 , H02M3/33592 , Y02B70/1475
摘要： A DC to DC power converter includes synchronous rectifiers which respond to a control waveform. Negative current from a load into the power converter is prevented by increasing the converter output voltage at a minimum current limit. The synchronous rectifiers may be held off in response to decision logic by activation of a hold-off circuit connected to a control terminal of a synchronous rectifier or of an ORing transistor at the converter output. When the synchronous rectifier is subsequently enabled, its control waveform may be increased slowly relative to the switching cycle.
摘要翻译： DC到DC电力转换器包括对控制波形做出响应的同步整流器。通过将转换器输出电压增加到最小电流限制来防止从负载到功率转换器的负电流。响应于决定逻辑，同步整流器可以通过激活连接到同步整流器的控制端子或转换器输出端的ORing晶体管的保持电路来保持。当同步整流器随后使能时，其控制波形可能相对于开关周期缓慢增加。

35. 发明授权

US06594159B2 High efficiency power converter 有权
公开(公告)号：US06594159B2
公开(公告)日：2003-07-15
申请号：US09821655
申请日：2001-03-29
申请人： Martin F. Schlecht
发明人： Martin F. Schlecht
IPC分类号： H02M3335
CPC分类号： H02M3/335 , H02J1/102 , H02M3/33592 , H02M3/3372 , H02M3/3374 , H02M2001/007 , Y02B70/1475
摘要： A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.

36. 发明授权

US4788634A Resonant forward converter 失效
标题翻译：谐振正激转换器
公开(公告)号：US4788634A
公开(公告)日：1988-11-29
申请号：US65016
申请日：1987-06-22
申请人： Martin F. Schlecht , Leo F. Casey
发明人： Martin F. Schlecht , Leo F. Casey
IPC分类号： H02M3/28 , H02M3/335 , H02M3/337
CPC分类号： H02M3/3374 , H02M3/33538 , H02M3/33569 , Y02B70/1433
摘要： A resonant forward converter at a switching frequency of 10 MHz provides a small volume point-of-load converter for distributed power systems. The leakage inductance of a transformer is made negligibly small relative to the magnetizing inductance of the transformer. This enables a resonant controllable switch on the primary side of a transformer and a secondary side rectified diode to be switched either on or off at the same time. The capacitance across the primary side switch and the secondary side diode rings with a resonant inductor connected in parallel with the transformer. Both the switch and diode, therefore, have zero voltage switching transitions. Further, the resonant inductor being connected in parallel with the transformer provides a resonant ring that is independent of load.
摘要翻译：谐振正向转换器的开关频率为10 MHz，为分布式电力系统提供了一个小体积的负载点转换器。变压器的漏电感相对于变压器的励磁电感可以忽略不计。这使得变压器的初级侧的谐振可控开关和次级侧整流二极管能够同时接通或断开。初级侧开关和次级侧二极管环路之间的电容，谐振电感与变压器并联连接。因此，开关和二极管都具有零电压开关转换。此外，与变压器并联连接的谐振电感器提供独立于负载的谐振环。

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