公开(公告)号：US4811184A

公开(公告)日：1989-03-07

申请号：US192268

申请日：1988-05-10

申请人： Peter M. Koninsky ,  Emilio F. D'Ariano

发明人： Peter M. Koninsky ,  Emilio F. D'Ariano

IPC分类号： H02H7/12 ,  H02M3/337 ,  H02M3/156

CPC分类号： H02H7/1213 ,  H02M3/3376

摘要： In a dc-to-dc converter, alternating current or pulsating direct current produced by a cyclically switched power supply passes through semiconductor rectifiers or diodes. The rectifiers may be subject to unwanted conduction characteristics attributable to charge storage, which may result in cyclical current spikes during normal operation. A current sensor is coupled to sense a current which includes the cyclical spikes. A controllable attenuator or gain element couples the sensed current in a feedback loop to shut down the converter in the event of an overcurrent. To reduce the possibility of shut-down due to the normal cyclical current spikes, the attenuator or gain element is cyclically switched so as to reduce the sensitivity to the current spikes when they occur.

摘要翻译： 在直流 - 直流转换器中，由循环切换电源产生的交流或脉动直流通过半导体整流器或二极管。 整流器可能受到归因于电荷存储的不期望的导电特性的影响，这可能导致正常操作期间的周期性电流尖峰。 耦合电流传感器以感测包括周期性尖峰的电流。 可控制的衰减器或增益元件将感测到的电流耦合在反馈回路中以在过电流的情况下关闭转换器。 为了减少由于正常的周期性电流尖峰引起的关闭的可能性，衰减器或增益元件被循环切换，以便当它们发生时降低对电流尖峰的灵敏度。

公开(公告)号：US4774419A

公开(公告)日：1988-09-27

申请号：US65735

申请日：1987-06-24

申请人： Emilio F. D'Ariano

发明人： Emilio F. D'Ariano

IPC分类号： H03K17/687 ,  H03K17/691 ,  H03K3/26 ,  H03K3/45 ,  H03K17/56

CPC分类号： H03K17/691 ,  H03K17/6877

摘要： A transformer includes a secondary winding coupled to a load which may be the source and gate of a FET. The primary winding of the transformer is connected to a pair of switching transistors, a first of which couples the winding across B+ during a positive portion of the drive cycle, and a second of which couples a charged capacitor across the primary during a second, negative portion of the drive cycle. The duty cycle defined by the positive and negative portions of the cycle varies. In order to prevent excess current during saturation of the core for duty cycles other than 50%, the capacitor is sized to supply only enough voltage and current to reset the core.

摘要翻译： 变压器包括耦合到可以是FET的源极和栅极的负载的次级绕组。 变压器的初级绕组连接到一对开关晶体管，其中一对开关晶体管中的第一绕组在驱动周期的正部分期间将绕组耦合到B +，并且其中一个在第二次耦合负载的电容器 驱动周期的一部分。 由循环的正负部分定义的占空比变化。 为了防止芯饱和期间的过电流超过50％的占空比，电容器的大小只能提供足够的电压和电流来复位磁芯。