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公开(公告)号：US5560347A
公开(公告)日：1996-10-01
申请号：US395140
申请日：1995-02-27
申请人： Sam R. Reddy , Kalyan P. Gokhale
发明人： Sam R. Reddy , Kalyan P. Gokhale
CPC分类号： G01N27/12 , F02M25/0809
摘要： An apparatus for use in diagnosing an evaporative emission canister collection and purge system. An EVAP system of a vehicle is diagnosed through the use of a mechanism wherein a change in conductivity occurs in response to a change in concentration of fuel vapor in the variably conductive mechanism. By sensing the change in conductivity, a diagnostic mechanism determines whether the vapor collection and purge systems are operating correctly.
摘要翻译： 一种用于诊断蒸发排放罐收集和净化系统的装置。 车辆的EVAP系统通过使用其中响应于可变导电机构中的燃料蒸气浓度变化而发生变化的机构来诊断。 通过检测电导率的变化，诊断机制确定蒸气收集和清洗系统是否正常运行。
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公开(公告)号：US20110299312A1
公开(公告)日：2011-12-08
申请号：US13151766
申请日：2011-06-02
IPC分类号： H02M7/5387
CPC分类号： H02M7/487 , H02J3/383 , Y02E10/563
摘要： A full-bridge, NPC inverter uses pulse width modulation (PWM) to convert the DC voltage from a solar panel array to an AC voltage at the output of the inverter that is acceptable for connection to a utility. The PWM control unit has a predetermined carrier frequency. The carrier unit uses for each carrier period either positive or negative values of a reference voltage to generate a predetermined number of signals to control the switching on and off of each of the eight inverter switching elements in a predetermined pattern for a predetermined period of the carrier frequency period to thereby produce the acceptable alternating current voltage at the inverter output and not produce between the inverter input and earth ground a carrier frequency component.
摘要翻译： 全桥NPC逆变器使用脉冲宽度调制（PWM）将来自太阳能电池板阵列的直流电压转换为连接到公用设施可接受的逆变器输出端的交流电压。 PWM控制单元具有预定的载波频率。 载波单元在每个载波周期使用参考电压的正值或负值，以产生预定数量的信号，以在载波的预定时段内以预定模式控制八个逆变器开关元件中的每一个的开关 从而在逆变器输出端产生可接受的交流电压，并且不会在变频器输入和接地之间产生载波频率分量。
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公开(公告)号：US06965290B2
公开(公告)日：2005-11-15
申请号：US10635271
申请日：2003-08-06
CPC分类号： H01F3/14 , H01F38/023 , H02M1/126 , Y10T29/4902 , Y10T29/49069 , Y10T29/49075 , Y10T29/49078
摘要： Non-linear inductor(s) are used to reduce the percent total harmonic distortion of the harmonics in the line currents in the input side rectifier system of an ac drive system. Several constructions for the non-linear inductor(s) are described. The non-linear inductor(s) may be constructed from E and I laminations. The gap depends on the construction of the middle leg of the E laminations and may have a step with a constant spacing or a variable spacing which depends on the stacking of the laminations. Alternatively the non-linear inductor(s) may be constructed from a toriodal core that either has a step gap or a variable type gap.
摘要翻译： 非线性电感用于降低交流驱动系统输入侧整流系统中线路电流中谐波的总谐波失真百分比。 描述了用于非线性电感器的若干结构。 非线性电感器可以由E和I叠层构成。 间隙取决于E叠片的中间腿的结构，并且可以具有取决于叠片的堆叠的恒定间隔或可变间隔的台阶。 或者，非线性电感器可以由具有阶跃间隙或可变型间隙的环形磁芯构成。
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4.发明授权Method and apparatus for minimizing torque ripple in a DC brushless motor using phase current overlap 失效在使用相电流重叠的直流无刷电机中使转矩波动最小化的方法和装置
公开(公告)号：US5672944A
公开(公告)日：1997-09-30
申请号：US735150
申请日：1996-10-22
IPC分类号： H02P6/10
CPC分类号： H02P6/10
摘要： A method for minimizing torque ripple in a permanent magnet brushless DC motor includes the steps of energizing a first winding of the motor to generate a first current, energizing a second winding of the motor to generate a second current, and overlapping the first and second currents in time by a preselected time to reduce torque ripple. The structure for performing the method includes conventional brushless DC motor drive circuitry responsive to a motor rotor position signal, and a speed control signal, to sequentially generate a gate drive signal for driving a respective semiconductor switch to energize each winding of the motor. The structure further includes a phase overlapping circuit interposed between the conventional brushless DC motor control circuitry output and the semiconductor switches used to energize each winding of the motor. The phase current overlap circuit includes a monostable multi-vibrator for generating a "one-shot." The pulse width or duration of the "one-shot" determines the extent of the phase current overlap. The overlapping circuit detects transitions on the gate drive signal lines, and in response generates a trigger signal. The trigger signal triggers generation of the "one-shot." The overlapping circuit maintains two of its gate drive signals for the duration of the "one-shot."
摘要翻译： 一种用于使永磁无刷直流电动机中的转矩波动最小化的方法包括以下步骤：激励电动机的第一绕组以产生第一电流，激励电动机的第二绕组以产生第二电流，并且与第一和第二电流重叠 通过预选的时间来减少扭矩波动。 用于执行该方法的结构包括响应于电动机转子位置信号的常规无刷直流电动机驱动电路和速度控制信号，以顺序地产生用于驱动相应半导体开关以激励电动机的每个绕组的栅极驱动信号。 该结构还包括插入在常规无刷DC电动机控制电路输出端和用于激励电动机的每个绕组的半导体开关之间的相位重叠电路。 相电流重叠电路包括用于产生“单次”的单稳态多谐振荡器。 “单次”的脉冲宽度或持续时间决定了相电流重叠的程度。 重叠电路检测栅极驱动信号线上的转变，并且响应产生触发信号。 触发信号触发“单次”的生成。 重叠电路在“一次”的持续时间内保持两个门驱动信号。
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公开(公告)号：US20110194317A1
公开(公告)日：2011-08-11
申请号：US13059872
申请日：2009-08-20
IPC分类号： H02M3/335
CPC分类号： H02M3/33569
摘要： A voltage converter includes a transformer with a pair of primary coils and a secondary coil. The converter has a DC input and a capacitor bank, having a pair of capacitors, is connected across the DC input. A switch is associated with each primary coil. A gate drive feedback module outputs a pulse width modulated signal to drive either the first or second primary coil. A gate drive switch has as an input the pulse width modulated signal and outputs to the first second switch. A pulse steering logic module determines which of the first or second capacitors has a higher voltage and controls the gate drive switch to direct the pulse width modulated signal in response thereto.
摘要翻译： 电压转换器包括具有一对初级线圈和次级线圈的变压器。 该转换器具有一个直流输入和一个电容器组，具有一对电容器，跨过直流输入端连接。 开关与每个初级线圈相关联。 门驱动反馈模块输出脉宽调制信号来驱动第一或第二初级线圈。 门驱动开关具有作为输入的脉宽调制信号并输出到第一第二开关。 脉冲转向逻辑模块确定第一或第二电容器中的哪一个具有较高的电压，并且控制栅极驱动开关以响应于此而引导脉宽调制信号。
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公开(公告)号：US4998526A
公开(公告)日：1991-03-12
申请号：US533329
申请日：1990-06-05
申请人： Kalyan P. Gokhale
发明人： Kalyan P. Gokhale
CPC分类号： F02P3/0456 , F02P15/10 , F02P3/005 , F02P3/01 , F02P9/002
摘要： An ignition system for a spark ignited internal combustion engine. The system can apply alternating current to the electrodes of a spark plug to maintain an arc at the electrodes for the desired length of time. The amplitude of the arc current can be varied. The alternating current is developed by a DC to AC inverter that is comprised of a transformer that has a center tapped primary and a secondary that is connected to the spark plug. An arc is initiated at the spark plug by discharging a capacitor through one of the winding portions of the center-tapped primary. Alternatively, the energy stored in an inductor can be supplied to a primary winding portion to initiate an arc. The ignition system is powered by a controlled current source that receives input power from a source of direct voltage such as a battery on a motor vehicle.
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公开(公告)号：US4835467A
公开(公告)日：1989-05-30
申请号：US147978
申请日：1988-01-25
申请人： Kalyan P. Gokhale
发明人： Kalyan P. Gokhale
摘要： A magnetoresistive sensor monitors the passing of teeth on a rotating wheel and generates a DC biased speed signal. An amplifier compares this voltage with the capacitor voltage and charges or discharges the capacitor through a pair of parallel coupled, oppositely poled diodes to maintain the capacitor voltage equal to the DC biased speed signal. The voltage across the diode pair is supplied to a comparator switch to provide a pulse train having a frequency that is a measure of the rotational speed of the wheel.
摘要翻译： 磁阻传感器监测旋转轮上的齿的通过并产生DC偏置速度信号。 放大器将该电压与电容器电压进行比较，并通过一对并联耦合的相对极化的二极管对电容器进行充电或放电，以保持电容器电压等于直流偏置速度信号。 二极管对上的电压被提供给比较器开关以提供具有作为轮的转速的量度的频率的脉冲串。
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公开(公告)号：US20130027021A1
公开(公告)日：2013-01-31
申请号：US13192783
申请日：2011-07-28
申请人： Kalyan P. Gokhale
发明人： Kalyan P. Gokhale
IPC分类号： G01R15/20
CPC分类号： G01R15/183 , G01R19/0015
摘要： A current sensor is provided for measuring DC current in a primary conductor also carrying AC current. The current sensor includes a ferromagnetic core through which the primary conductor may extend. The core has a narrow air gap formed therein and a magnetic flux sensor is disposed in the air gap. A secondary winding is mounted to the core and has an impedance connected therein. The impedance has a value of substantially zero at one or more frequencies of the AC current. The impedance may be a short or an impedance source that includes a capacitor and an inductor.
摘要翻译： 提供电流传感器用于测量也承载交流电流的初级导体中的直流电流。 电流传感器包括铁磁芯，主导体可以通过铁磁芯延伸。 芯部具有形成在其中的窄气隙，并且磁通量传感器设置在气隙中。 次级绕组安装到芯上并且其中连接有阻抗。 阻抗在交流电流的一个或多个频率处具有基本为零的值。 阻抗可以是包括电容器和电感器的短路或阻抗源。
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公开(公告)号：US06922883B2
公开(公告)日：2005-08-02
申请号：US10635313
申请日：2003-08-06
CPC分类号： H01F3/14 , H01F38/023 , H02M1/126 , Y10T29/4902 , Y10T29/49069 , Y10T29/49075 , Y10T29/49078
摘要： Non-linear inductor(s) are used to reduce the percent total harmonic distortion of the harmonics in the line currents in the input side rectifier system of an ac drive system. Several constructions for the non-linear inductor(s) are described. The non-linear inductor(s) may be constructed from E and I laminations. The gap depends on the construction of the middle leg of the E laminations and may have a step with a constant spacing or a variable spacing which depends on the stacking of the laminations. Alternatively the non-linear inductor(s) may be constructed from a toriodal core that either has a step gap or a variable type gap.
摘要翻译： 非线性电感用于降低交流驱动系统输入侧整流系统中线路电流中谐波的总谐波失真百分比。 描述了用于非线性电感器的若干结构。 非线性电感器可以由E和I叠层构成。 间隙取决于E叠片的中间腿的结构，并且可以具有取决于叠片的堆叠的恒定间隔或可变间隔的台阶。 或者，非线性电感器可以由具有阶跃间隙或可变型间隙的环形磁芯构成。
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10.发明授权Multi-bit encoder signal conditioning circuit having common mode disturbance compensation 失效具有共模干扰补偿的多位编码器信号调理电路
公开(公告)号：US5291133A
公开(公告)日：1994-03-01
申请号：US933536
申请日：1992-08-24
CPC分类号： G01D5/249 , G01D5/2497 , G01P3/46 , G01P3/489
摘要： A signal conditioning circuit which converts multiple analog signals received from an encoder into a multi-bit digital signal, corresponding to the angular position of a rotary object, which is independent of any common mode disturbances such as temperature, humidity, ambient light and aging. At any given time, at least one of the analog signals is at a maximum voltage and at least one of the analog signals is at a minimum voltage. At no time are all of the analog signals simultaneously at a maximum or simultaneously at a minimum. The signal conditioning circuit continuously detects the maximum and minimum values of the analog signals. A midpoint of the maximum and minimum values is determined and compared with the original analog signals. For all values of the analog signals greater than the midpoint value, a binary logic level of 1 is outputted. For all values of the analog signals less than the midpoint value, a binary logic level of 0 is outputted. There is one comparator and corresponding binary output for each analog signal. In combination, the comparators form the necessary multi-bit digital signal.
摘要翻译： 信号调理电路，其将从编码器接收的多个模拟信号转换为对应于旋转对象的角位置的多位数字信号，其独立于任何共模干扰，例如温度，湿度，环境光和老化。 在任何给定时间，模拟信号中的至少一个处于最大电压，并且至少一个模拟信号处于最小电压。 在任何时候，所有的模拟信号同时处于最大或同时处于最小值。 信号调理电路连续检测模拟信号的最大值和最小值。 确定最大值和最小值的中点，并将其与原始模拟信号进行比较。 对于大于中点值的模拟信号的所有值，输出二进制逻辑电平1。 对于小于中点值的模拟信号的所有值，输出二进制逻辑电平0。 每个模拟信号有一个比较器和相应的二进制输出。 结合起来，比较器形成必要的多位数字信号。
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