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公开(公告)号：EP1338082A1
公开(公告)日：2003-08-27
申请号：EP01991534.7
申请日：2001-11-09
申请人： NMB (USA), Inc.
发明人： JANSEN, Arian, M. , ZHANG, Xiaoyang
IPC分类号： H02M3/335
CPC分类号： H02M3/33592 , Y02B70/1475
摘要： The invention is a power converter having a transformer (T) with a primary side winding (T1A) and a secondary side winding (T1C). Both the primary side and the secondary side have switches (Q1 & Q101) which are switched on and off alternately. When the primary master switch (Q1) is switched on, the transformer (T) charges. When the primary master switch (Q1) is switched off, the intrinsic capacitance of the secondary slave switch (Q101) discharges generating the zero voltage switching condition for the secondary slave switch (Q101). The secondary slave switch (Q101) is switched on at a time determined in accordance with the waveform generated by the transformer (T). When the secondary slave switch (Q101) is switched on, the transformer (T) discharges and ultimately the charge from an output capacitor (C101) flows into the transformer (T) as a backflow which charges the transformer (T). The secondary slave switch (Q101) is switched off at a time determined in accordance with a current flowing through said secondary switch (Q101). The intrinsic capacitance of primary master switch (Q1) discharges generating the zero voltage switching condition primary master switch (Q1) is then switched on and the cycle repeats.
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公开(公告)号：EP1295386A1
公开(公告)日：2003-03-26
申请号：EP01927270.7
申请日：2001-04-20
申请人： NMB (USA), Inc.
发明人： HARDT, Eric, A.
IPC分类号： H02P7/00
CPC分类号： H02P6/16 , H02P6/12 , H02P6/20 , H02P29/032 , Y10S388/904
摘要： A drive circuit for a brushless DC motor (100) controls at least one of a number of possible operation features of the motor. The drive circuit includes a driver stage for providing a current for a stator coil and varies which of the number of possible operation features of the motor are controlled. The operation features of the motor include inrush current limit control, PWM speed control, analog speed control, detecting a locked rotor condition, setting an alarm following detection of the locked rotor condition, restarting the motor following the locked rotor condition, detecting a low speed condition, and setting an alarm following detection of the low speed condition. Some of the operation features of the motor utilize at least one parameter that defines the desired operation of the feature. The drive circuit further varies the parameters of the operation features without changing the physical configuration of the brushless DC motor.
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公开(公告)号：EP1287614A1
公开(公告)日：2003-03-05
申请号：EP01932982.0
申请日：2001-05-04
申请人： NMB (USA), Inc.
发明人： JANSEN, Arian, M.
IPC分类号： H03K17/74
CPC分类号： H03K17/302 , G06G7/62 , H02H11/003 , H03K17/06 , H03K17/063 , H03K17/74 , H03K2017/307
摘要： A circuit simulating the function of a diode in the sense that it conducts current in one direction and blocks current in the opposite direction, but which has a low forward voltage drop. A voltage comparator (12) and a three terminal switch (10) are connected so that the intrinsic reverse diode (11) associated with the switch is harnessed to conduct current in the direction in which it is desired to conduct current and to block current in the direction in which it is desired to block current. A voltage comparator controls the control terminal (G) of the three terminal switch to turn on the switch to conduct current and to interrupt current. Alternate embodiments of voltage comparators are disclosed. The voltage comparator may include charging and discharging transistors so that the switch turns on and off at a high speed. The invention further includes a method of conducting current in one direction and blocking current in a second direction which reduces power losses.
摘要翻译： 一个电路模拟二极管的功能，即在一个方向上传导电流并阻止电流在相反的方向上传输，但其具有较低的正向压降。 连接一个电压比较器（12）和一个三端开关（10），使得与开关相关的本征反向二极管（11）被利用以在希望传导电流的方向上传导电流并阻断电流进入 期望阻断电流的方向。 电压比较器控制三端子开关的控制端子（G）以导通开关以导通电流并中断电流。 公开了电压比较器的替代实施例。 电压比较器可以包括充电和放电晶体管，使得开关以高速开启和关闭。 本发明进一步包括一种在一个方向上传导电流并在第二方向上阻断电流的方法，该方法降低了功率损耗。
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公开(公告)号：EP1177612A1
公开(公告)日：2002-02-06
申请号：EP00916236.3
申请日：2000-03-10
申请人： NMB (USA), Inc.
发明人： JANSEN, Arian
CPC分类号： H02J1/102
摘要： A system (30) and a method may use variable-frequency power sources for supplying power to a load (36). The system and method use phase detection in order to automatically and substantially equalize the currents supplied to a load by each of the variable-frequency power sources, and to cancel a ripple component of the input current drawn by the system. First and second power sources (31, 32) supply power to the load. The power sources have a similar relationship between their respective variable switching frequencies of, respectively, the first and second power sources are locked to one another using phase detection to substantially equalize the power supplied to the load by each power source. The system and method are advantageously utilized to provide a power factor correction front-end for a switch-mode power supply. Power sources with non-linear and/or inverse relationships between power supplied and switching frequency can be used. In alternate embodiments power from series power sources is equalized by equalizing voltages supplied by each power source to a load.
摘要翻译： 系统（30）和方法可以使用变频电源向负载（36）供电。 该系统和方法使用相位检测，以便自动且基本均衡由每个变频电源提供给负载的电流，并且消除由系统汲取的输入电流的纹波分量。 第一和第二电源（31,32）向负载供电。 电源在它们各自的可变开关频率之间具有类似的关系，第一和第二电源分别利用相位检测彼此锁定，以基本均衡由每个电源提供给负载的电力。 该系统和方法有利地用于为开关模式电源提供功率因数校正前端。 可以使用在供电和开关频率之间具有非线性和/或反相关系的电源。 在替代实施例中，通过均衡由每个电源向负载供应的电压来均衡来自串联电源的电力。
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公开(公告)号：EP1078378A1
公开(公告)日：2001-02-28
申请号：EP99924153.2
申请日：1999-05-07
申请人： NMB (USA), Inc.
发明人： JANSEN, Arianm
CPC分类号： H02M7/066
摘要： A power regulator (30) is provided which employs a resonant circuit (32) and permits regulation between a certain maximum value and zero. A series resonant circuit is adjusted to regulate power by adjusting the correspondence between the resonance frequency and the frequency of the voltage source (31) such as an AC source delivering a sine wave or a square wave. Further, the output voltage is regulated to be lower than the AC source (31) when output current is zero. A capacitance (C2) is connected in parallel with the output of the power regulator (30) to form a second resonant circuit with the inductance (L1) of the series resonant circuit (32). A method of power regulation is also contemplated.
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公开(公告)号：EP1072095A1
公开(公告)日：2001-01-31
申请号：EP99915353.9
申请日：1999-04-12
申请人： NMB (USA), Inc.
发明人： Arian M.JANSEN
IPC分类号： H03K17/74
CPC分类号： H03K17/302 , H03K17/063 , H03K2017/307
摘要： A circuit simulating the function of a diode in the sense that it conducts current in one direction and blocks current in the opposite direction, but which has a low forward voltage drop. A voltage comparator (12) and a three terminal switch (10) are connected so that the intrinsic reverse diode (11) associated with the switch is harnessed to conduct current in the direction in which it is desired to conduct current and to block current in the direction in which it is desired to block current. A voltage comparator controls the control terminal (G) of the three terminal switch to turn on the switch to conduct current from a terminal A to a terminal K when the voltage at terminal A is higher than the voltage at terminal K and to interrupt current from terminal K to terminal A when the voltage at the terminal K is higher than the voltage at terminal A. The switch terminal (source or drain) that is typically connected to the higher voltage of two voltage terminals is instead connected to the lower voltage of the two voltage terminals. The switch may be a MOSFET, p- or n-channel, depletion or enhancement. Alternatively, a bioplar transistor (30) may be connected to a voltage comparator to simulate the function of a diode. Alternate embodiments of voltage comparators are disclosed. The invention further includes a method of conducting current in one direction and blocking current in a second direction which reduces power losses.
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公开(公告)号：EP1263597A1
公开(公告)日：2002-12-11
申请号：EP01918747.5
申请日：2001-03-16
申请人： NMB (USA), Inc.
CPC分类号： G06F3/0202 , H01H3/122 , H01H13/70 , H01H2223/002 , H01H2223/004
摘要： The present invention relates to a spill resistant keyboard including at least one circuit (40) to permit a spilled liquid to drain through the keyboard without damaging the keyboard's electronics. The conduit is positioned along a sloped surface (26) located along a front edge of a recessed area (24) of the keyboard to promote the drainage of the spilled liquid through the conduit. The keyboard also includes water protection walls (30) positioned around certain elongated keys to prevent the spilled liquid from entering the body of the keyboard.
摘要翻译： 本发明涉及防泼溅键盘，其包括至少一个电路（40），以允许溢出的液体通过键盘排出而不损坏键盘的电子器件。 导管沿着沿键盘的凹陷区域（24）的前边缘定位的倾斜表面（26）定位，以促进溢出的液体通过导管排出。 键盘还包括定位在某些细长键周围的防水壁（30），以防止溢出的液体进入键盘主体。
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公开(公告)号：EP1261898A2
公开(公告)日：2002-12-04
申请号：EP00986397.8
申请日：2000-12-14
申请人： NMB (USA), Inc.
IPC分类号： G05D1/00
CPC分类号： G05D7/0133 , Y10T137/7792
摘要： A reduced length, pressure compensating liquid flow regulator includes a poppet (20) defining a longitudinally extending hollow cylinder (32) having a front sensing orifice (38) and rear orifice (40). A retainer (24) maintains a biasing spring (22) at least partially within the cylinder (32), and biases the rear orifice (40) away seat (26). The seat has a closed front face (60) spaced from and facing the cylinder (32), side passages (62) rearwardly of the seat front face (60), and a downstream passage (64). A hollow housing (28) slidably receives the cylinder. The magnitude of the spacing between the seat front face (60) and the cylinder rear orifice (40) is self-adjusting as an inverse function of the flow rate, to provide a substantially constant flow through the device by compensating for variations in the pressure differential across the sense orifice (38).
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公开(公告)号：EP1177612A4
公开(公告)日：2002-07-10
申请号：EP00916236
申请日：2000-03-10
申请人： NMB USA INC
发明人： JANSEN ARIAN
CPC分类号： H02J1/102
摘要： A system (30) and a method may use variable-frequency power sources for supplying power to a load (36). The system and method use phase detection in order to automatically and substantially equalize the currents supplied to a load by each of the variable-frequency power sources, and to cancel a ripple component of the input current drawn by the system. First and second power sources (31, 32) supply power to the load. The power sources have a similar relationship between their respective variable switching frequencies of, respectively, the first and second power sources are locked to one another using phase detection to substantially equalize the power supplied to the load by each power source. The system and method are advantageously utilized to provide a power factor correction front-end for a switch-mode power supply. Power sources with non-linear and/or inverse relationships between power supplied and switching frequency can be used. In alternate embodiments power from series power sources is equalized by equalizing voltages supplied by each power source to a load.
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公开(公告)号：EP1082735A1
公开(公告)日：2001-03-14
申请号：EP99921775.5
申请日：1999-05-07
申请人： NMB (USA), Inc.
发明人： JANSEN, Adrian M.
CPC分类号： H01F27/24 , H01F29/14 , H01F2029/143
摘要： A variable inductor with a saturable core having three legs (42, 43, 44), including a center leg (43) and two outer legs. A control winding (45) is wound on the center leg and two outer windings (46, 47) are connected in parallel and wound on the outer legs. The inductances of the windings on the outer legs vary with the current through the control winding. The current through the control winding varies the saturation level of the outer legs. In one embodiment the inductance of the control winding is substantially constant with a change in current in the control winding. In another embodiment, the outer legs are saturated and the center leg is not saturated. Portions (48-51) of the core connecting the three legs are tapered down from the cross section of the center leg (43) to the cross sections of the outer legs (42, 44). The invention further includes methods of varying the inductance of an inductive circuit element in accordance with a control current.
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