-
公开(公告)号：EP1219000B1
公开(公告)日：2011-01-12
申请号：EP00963170.6
申请日：2000-09-06
CPC分类号： H02M7/217 , H02J5/005 , H02J7/025 , H02J50/12 , Y02B70/1441
摘要： A series resonant inductive pickup has a bi-directional solid state switch in series with an inductor and a capacitor is controlled by switch control elements capable of causing the switching elements to repetitively be in either an open or a closed state, so that by varying the closed: open ratio of the switch the time-averaged amount of power picked up by the power pickup can be controlled. Switch is controlled by output of a voltage comparing circuit. A reference voltage source provides a basis for comparison of some fraction of a supply voltage in order to cause the switch to operate. The magnitude of capacitance in relation to the current drawn by the load determines the repetition rate of ON or OFF commands to the switch. If the current drawn by the load tends to zero, the proportion of time during which the switch is open will tend to 100%.
-
公开(公告)号：EP1032963B1
公开(公告)日：2004-01-02
申请号：EP98956041.2
申请日：1998-11-16
发明人： BOYS, John, Talbot
CPC分类号： B60L5/005 , B60L2200/26 , H02J5/005 , H02J50/12 , Y10T307/297
摘要： Secondary resonant pickup coils (102) used in loosely coupled inductive power transfer systems, with resonating capacitors (902) have high Q and could support large circulating currents which may destroy components. A current limit or "safety valve" uses an inductor designed to enter saturation at predetermined resonating currents somewhat above normal working levels. Saturation is immediate and passive. The constant-current characteristic of a loosely coupled, controlled pickup means that if the saturable section is shared by coupling flux and by leakage flux, then on saturation the current source is terminated in the saturated inductor, and little detuning from resonance occurs. Alternatively an external saturable inductor (1101, 1102) may be introduced within the resonant circuit (102 and 902), to detune the circuit away from the system frequency. Alternatively DC current may be passed through a winding to increase saturation of a saturable part of a core. As a result, a fail-safe pickup offering a voltage-limited constant-current output is provided.
-
公开(公告)号：EP1050094A1
公开(公告)日：2000-11-08
申请号：EP98962726.0
申请日：1998-12-04
发明人： BOYS, John, Talbot
CPC分类号： H04B5/00 , H01F3/14 , H01F17/06 , H02J5/005 , H02J7/025 , H02J50/12 , H02J50/40 , H04B5/0012 , H04B5/0037
摘要： Apparatus for providing effective amounts of high-frequency AC power to a long primary trackway (1102), used for inductive power transfer includes transconductance-pi filters (1105) for deliberate mismatching; resulting in independence of current flow and track impedance. These cause the source (1101) to appear as a voltage source and the trackway to appear as a low reactance. Shorting the output (1106) cuts the connected trackway from power without harm. The filter can cause a voltage step-up so driving a longer track. Track termination apparatus is disclosed that acts as a short circuit at only the operating frequency while terminating the track at its characteristic impedance otherwise. Half-bridge and full-bridge power supplies (1101) are described for providing effective amounts of high-frequency AC power to a long primary trackway used for inductive power transfer.
-
公开(公告)号：EP1010229A1
公开(公告)日：2000-06-21
申请号：EP98923226.9
申请日：1998-05-04
发明人： BOYS, John, Talbot
CPC分类号： H02M7/5381 , H01F38/14 , H02J5/005 , H02J7/025 , H02J50/12 , H02J50/40 , H02M2001/007
摘要： Inductive power transfer across an extended gap (100) from a primary conductor (119) is provided by means of a resonant intermediate loop comprised of capacitor (118) with inductor (117) carrying a larger resonating current, that can in turn generate an inductive field to be collected by a pickup coil (120). This process and device find application in an electroluminescent advertising panel.
-
公开(公告)号：EP0577611B1
公开(公告)日：1998-10-07
申请号：EP92904583.9
申请日：1992-02-05
IPC分类号： H02J5/00
CPC分类号： H02J50/12 , B60L5/005 , B60L2200/26 , H02J5/005 , H02J7/025 , H02M5/458 , H02M7/53806
摘要： A contactless inductive power distribution system operating at 10 KHz has a self tuning resonant power supply connected to a resonant primary conductive path 10110, 10111 comprising a pair of parallel litz wire conductors 10110, 10111 each encapsulated within an insulated sheath and supported on a structural monorail beam 10101 on which a plurality of electric vehicles can run. Each vehicle has an electric motor (not shown) capable of deriving power from a resonant pick-up coil 10115 wound on a ferrite core 10102 mounted on the vehicle in close proximity to the primary conductors 10110, 10111. Each vehicle also has switching means 10116 capable of preventing a lightly loaded vehicle from presenting a reduced load to the resonant primary. As shown, this comprises an isolating coil 10116 having a switch (not shown) to switch the coil between an open circuit and a short circuit, so that when the switch is switched from one state to another state the power coupled between the primary conductive path 10110, 10111 and the pick-up coil 10115 is changed.
-
公开(公告)号：EP0786165A1
公开(公告)日：1997-07-30
申请号：EP95923610.0
申请日：1995-07-11
CPC分类号： H05B33/0815 , E01F9/559 , F21W2111/02 , F21Y2115/10 , H02J5/005 , H02J17/00 , H02J50/12 , H02J50/40 , H05B33/0803 , H05B39/00 , H05B41/245
摘要： An inductively powered lamp unit (500) that uses an inductive power pick up comprising a resonant circuit including an inductance (401) and capacitance (402), the induced current circulating in the resonant circuit is limited to a maximum value by a shorting switch (503) that closes a connection across the inductance (401) shorting the resonant circuit. The shorting switch (503) is controlled by a comparator (506) that compares the sensed current with a reference value (510). Voltage control maybe similarly implemented. Power is supplied to LED's (405), control data may also be conveyed through the inductive link. Applications include roadway markers, fire escape indicators, underwater or explosive environmental lighting.
摘要翻译： 一种感应供电的灯单元（500），其使用包括电感（401）和电容（402）的谐振电路的感应功率拾取器，在谐振电路中循环的感应电流通过短路开关限制到最大值 503），其闭合跨过电感（401）的连接使谐振电路短路。 短路开关（503）由比较器（506）控制，比较器将感测的电流与参考值（510）进行比较。 电压控制可以类似地实现。 电源被提供给LED（405），控制数据也可以通过感应链路传送。 应用包括道路标记，防火指示器，水下或爆炸性环境照明。
-
-
-
-
-
搜索结果
26 条记录 (耗时 0.015 秒)
