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公开(公告)号：US5608771A
公开(公告)日：1997-03-04
申请号：US547078
申请日：1995-10-23
摘要： Power is transferred from a stationary power supply to a rotational gantry in a computer tomography (CT) system through a rotary transformer arranged in a ring configuration with an inner diameter that is sufficiently large to receive a patient. The rotary transformer has a toroidal rotor core and a toroidal stator core arranged either concentrically with an air gap extending radially therebetween or side-by-side with an air gap extending axially therebetween. A resonant inverter provides ac power to the rotary transformer which, in turn, drives a high-voltage tank circuit coupled to a x-ray tube, the tank circuit and x-ray tube being mounted on a rotational gantry. Advantageously, this is a contactless power transfer system which eliminates conventional brush and slip ring arrangements and moreover avoids the need for mounting the inverter to rotate with the CT gantry.
摘要翻译： 电力通过布置成具有足够大以容纳患者的内径的环形结构的旋转变压器从计算机断层摄影（CT）系统中的固定电源传送到旋转台架。 旋转变压器具有环形转子芯和环形定子芯，该环形定子芯同心地布置有与其间径向延伸的气隙，或者与其间轴向延伸的气隙并排布置。 谐振逆变器为旋转变压器提供交流电力，旋转变压器又驱动耦合到X射线管的高压电路，电路和X射线管安装在旋转机架上。 有利地，这是一种非接触式电力传输系统，其消除了常规的刷和滑环布置，并且还避免了安装逆变器以与CT机架一起旋转的需要。
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公开(公告)号：US5359180A
公开(公告)日：1994-10-25
申请号：US956131
申请日：1992-10-02
CPC分类号： F03H1/0018 , G05F1/59 , H02J1/102 , H02J9/061 , H02J1/108 , Y10T307/653 , Y10T307/724
摘要： A power supply system for thrusters (e.g., arcjet thrusters) in a spacecraft system comprises lightweight, redundant power supplies that share the power distribution function to the thrusters. Each power supply comprises a plurality of parallel-connected power supply subunits of which the combined power output capability exceeds the required maximum power demand by at least one subunit capacity for each arcjet thruster in the system. Each power supply subunit comprises a lightweight, high-frequency, soft-switching power supply. For arcjet systems comprising arcjet thrusters that do not operate simultaneously, relays are employed to switch between thrusters.
摘要翻译： 在航天器系统中的用于推进器（例如，电弧喷射推进器）的供电系统包括与推进器共享功率分配功能的轻量级冗余电源。 每个电源包括多个并联连接的电源子单元，其中组合的功率输出能力超过系统中每个电弧喷射推进器的至少一个子单元容量所需的最大功率需求。 每个电源子单元包括轻便的高频软开关电源。 对于包括不同时操作的电弧喷射推进器的电弧喷射系统，采用继电器在推进器之间切换。
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3.发明授权Electrically isolated battery charger for on-board electric vehicle applications 失效用于车载电动汽车应用的电隔离电池充电器
公开(公告)号：US4374355A
公开(公告)日：1983-02-15
申请号：US239725
申请日：1981-03-02
CPC分类号： H02M3/33546 , H02J7/022 , H02M3/33523 , Y02T90/127 , Y10S320/29
摘要： A single transistor DC--DC battery charger provides ohmic isolation with a multiple winding high frequency transformer. The transistor's duty cycle is determined from an isolated voltage proportional to battery voltage obtained from a signal winding of the transformer when the transistor is off.
摘要翻译： 单晶体管DC-DC电池充电器通过多绕组高频变压器提供欧姆隔离。 当晶体管关断时，晶体管的占空比由与变压器的信号绕组获得的电池电压成比例的隔离电压确定。
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公开(公告)号：US4876635A
公开(公告)日：1989-10-24
申请号：US288909
申请日：1988-12-23
IPC分类号： H02M3/337 , H03K17/0814
CPC分类号： H03K17/08148 , H02M3/337 , H02M2007/4815 , Y02B70/1433 , Y02B70/1441
摘要： A circuit for "resetting" snubbers in a series resonant bridge inverter maintains lossless snubber action during light-load and no-load inverter operation and during operation near resonance. Series resonant circuit operation is controlled to be above the resonant frequency to ensure operation at a lagging power factor. The snubber-resetting operation is facilitated by a relatively small inductor connected across the output terminals of the series resonant inverter.
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公开(公告)号：US4339671A
公开(公告)日：1982-07-13
申请号：US133489
申请日：1980-03-21
IPC分类号： H03K17/0424 , H03K17/60
CPC分类号： H03K17/0424 , H03K17/601
摘要： An improved proportional base drive circuit for rapidly and efficiently switching a high current bipolar load transistor comprises a transformer having first and second serially coupled primary windings, and first and second secondary windings coupled to the collector and to the base, respectively, of a high current load transistor for supplying the transistor with collector current and base current proportional to the collector current, respectively. A diverter circuit is coupled to the second secondary transformer winding and to the base and emitter of the load transistor. During intervals when the second transformer primary winding is effectively short circuited to initiate load transistor turn-off, the diverter circuit diverts current in the second secondary winding away from the load transistor base and also removes load transistor stored charge to effect rapid load transistor turn-off, thereby assuring reliable transistor switching.
摘要翻译： 用于快速且有效地切换高电流双极性负载晶体管的改进的比例基极驱动电路包括具有第一和第二串联耦合的初级绕组的变压器，以及分别耦合到集电极和基极的第一和第二次级绕组的高电流 用于向晶体管提供与集电极电流成比例的集电极电流和基极电流的负载晶体管。 分流器电路耦合到第二次级变压器绕组和耦合到负载晶体管的基极和发射极。 在第二变压器初级绕组有效地短路以启动负载晶体管关断的间隔期间，分流器电路将第二次级绕组中的电流转移离开负载晶体管基极，并且还去除负载晶体管存储的电荷以实现快速负载晶体管截止， 从而确保可靠的晶体管切换。
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公开(公告)号：US3940682A
公开(公告)日：1976-02-24
申请号：US526117
申请日：1974-11-22
CPC分类号： H02M7/217
摘要： Full-wave and half-wave rectifier circuits are disclosed; the former circuit using two transistors and the latter circuit using one transistor. In both circuits transistors are connected in an inverted mode so that, for example, with an NPN transistor current flow is such that line current flows into the emitter and load current flows out of the collector. Furthermore, voltage blocking is performed by the collector-base junction instead of the emitter-base junction. High efficiency is achieved by controlling the transistor base current in response to the emitter current so that the base current is proportional to the emitter current and is also at an optimum magnitude so as to minimize circuit losses.
摘要翻译： 公开了全波和半波整流电路; 前一个电路使用两个晶体管，后一个电路使用一个晶体管。 在两个电路中，晶体管以反相模式连接，使得例如利用NPN晶体管电流流动使得线电流流入发射极，并且负载电流从集电极流出。 此外，通过集电极 - 基极结而不是发射极 - 基极结进行电压阻断。 通过响应于发射极电流控制晶体管基极电流实现高效率，使得基极电流与发射极电流成比例，并且也处于最佳幅度，以便最小化电路损耗。
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公开(公告)号：US4672528A
公开(公告)日：1987-06-09
申请号：US866818
申请日：1986-05-27
CPC分类号： H02M3/3376 , H02M2007/53878 , Y02B70/1433 , Y02B70/1441
摘要： A resonant inverter is operated in a manner to provide a substantially constant output voltage to a load. The inverter is controlled using either a frequency control mode or a phase shift control mode. In the frequency control mode, a constant output voltage is maintained through frequency variation of the rectangular wave signal applied to the resonant circuit of the inverter. In the phase shift control mode, constant output voltage is maintained by phase shifting one component signal of the rectangular wave signal relative to another component signal thereof while maintaining constant the frequency of both component signals. Mode switching occurs automatically at the extremities of the operating frequency range of controllable switch means in the resonant inverter.
摘要翻译： 谐振逆变器以向负载提供基本恒定的输出电压的方式操作。 使用频率控制模式或相移控制模式控制变频器。 在频率控制模式中，通过施加到逆变器的谐振电路的矩形波信号的频率变化来保持恒定的输出电压。 在相移控制模式中，通过相对于其另一分量信号相移矩形波信号的一个分量信号并保持两个分量信号的频率恒定来维持恒定的输出电压。 在谐振逆变器的可控开关装置的工作频率范围的末端，自动切换模式。
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公开(公告)号：US4347464A
公开(公告)日：1982-08-31
申请号：US239724
申请日：1981-03-02
IPC分类号： H02K29/08
CPC分类号： H02K29/08
摘要： A multipole permanent magnet rotor is positioned on a shaft and rotatably mounted in a multiphase stator having two windings per stator phase. A distributor comprising a pattern of conducting and non-conducting material is mounted to turn with the rotor shaft. Pickup "fingers" in contact with the distributor, gate appropriate FET's of the pairs of FET's associated with each stator phase in sequence, with timing dependent on the instantaneous shaft position, to generate a rotating flux field. A voltage across the windings provides the current for flux generation, and can be supplied by a full wave rectified single phase AC source. The speed of rotation of the motor can be controlled by varying the voltage supplied.
摘要翻译： 多极永磁转子位于轴上并可旋转地安装在每个定子相中具有两个绕组的多相定子中。 包括导电材料和非导电材料的图案的分配器安装成与转子轴一起转动。 拾取“指”与分配器接触，按顺序选择与每个定子相位相关联的FET对，其中定时取决于瞬时轴位置，以产生旋转磁通场。 绕组两端的电压提供了用于产生磁通的电流，并且可以由全波整流的单相交流电源提供。 可以通过改变所提供的电压来控制电动机的旋转速度。
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公开(公告)号：US5352861A
公开(公告)日：1994-10-04
申请号：US955970
申请日：1992-10-02
CPC分类号： H02M1/36 , F03H1/00 , H02M3/3376 , Y02B70/1433
摘要： A starting circuit for providing a high-voltage pulse for igniting an arc in an arcjet thruster includes a resonant capacitor for storage of the energy required to generate the high-voltage pulse. The capacitor is resonantly switched with a small resonant inductor which, in turn, resonates with a high-voltage cable capacitance, generating a high-voltage pulse via a step-up transformer to the arcjet thruster for igniting the arc. Advantageously, the transformer turns ratio is minimized, thus minimizing the required transformer size and weight; and the high-voltage pulse is isolated from the arcjet power supply semiconductor devices.
摘要翻译： 用于提供用于点燃电弧喷射推进器中的电弧的高电压脉冲的启动电路包括用于存储产生高压脉冲所需的能量的谐振电容器。 电容器用小的谐振电感器共振切换，该谐振电感又与高压电缆电容谐振，通过升压变压器产生高电压脉冲到电弧喷射推进器以点燃电弧。 有利地，变压器匝数比最小化，从而最小化所需的变压器尺寸和重量; 并且高压脉冲与电弧喷射电源半导体器件隔离。
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公开(公告)号：US5414238A
公开(公告)日：1995-05-09
申请号：US956130
申请日：1992-10-02
CPC分类号： B64G1/406 , B64G1/428 , F03H1/00 , H02M3/3376 , Y02B70/1433
摘要： A power supply for a thruster for space applications (e.g., an arcjet thruster) comprises a series/parallel resonant converter wherein the load quality (Q) factor of the resonant tank circuit inherently varies with arc voltage so as to accommodate changes in arc voltage from initiation thereof through steady-state operation. Effectively, the resonant tank circuit acts as a ballast by matching the arc during initiation thereof through steady-state operation. Furthermore, the resonant converter operates in a soft-switching, low-voltage switched mode so as to maximize efficiency.
摘要翻译： 用于空间应用的推进器的电源（例如，电弧喷射推进器）包括串联/并联谐振转换器，其中谐振回路的负载质量（Q）因子固有地随着电弧电压而变化，以便适应电弧电压的变化 通过稳态运行启动。 有效地，谐振回路作为镇流器，通过稳态操作在启动期间匹配电弧。 此外，谐振转换器以软开关，低电压开关模式工作，以使效率最大化。
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