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公开(公告)号：US09847724B2
公开(公告)日：2017-12-19
申请号：US14876538
申请日：2015-10-06
Applicant: Keithley Instruments, Inc.
Inventor： Wayne C. Goeke
CPC classification number: H02M3/33507 , H02M3/33569 , H02M3/337 , H02M2001/342 , H02M2001/344 , Y02B70/1491
Abstract: Embodiments of the present invention provide improved techniques and devices for reducing transformer commutation distortion caused by large load currents. Traditional power supplies which have two or more phases typically commutate a transformer during the end of each phase. When the load current is large, energy stored in the transformer's leakage inductance can cause undesirable effects during commutation. Embodiments of the present invention reduce these effects by lowering the voltage across the primary side of the transformer prior to commutation. In one embodiment, a capacitor is added to the primary side of the transformer. A switch directs current through the capacitor prior to commutation, allowing the capacitor to absorb the transformer's leakage inductance energy and lower the primary side voltage. Other suitable components, such as resistors, diodes, transistors, or additional transformer windings, may also be used to reduce the primary-side voltage prior to commutation.
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公开(公告)号：US20170099000A1
公开(公告)日：2017-04-06
申请号：US14876538
申请日：2015-10-06
Applicant: Keithley Instruments, Inc.
Inventor： Wayne C. Goeke
IPC: H02M3/335
CPC classification number: H02M3/33507 , H02M3/33569 , H02M3/337 , H02M2001/342 , H02M2001/344 , Y02B70/1491
Abstract: Embodiments of the present invention provide improved techniques and devices for reducing transformer commutation distortion caused by large load currents. Traditional power supplies which have two or more phases typically commutate a transformer during the end of each phase. When the load current is large, energy stored in the transformer's leakage inductance can cause undesirable effects during commutation. Embodiments of the present invention reduce these effects by lowering the voltage across the primary side of the transformer prior to commutation. In one embodiment, a capacitor is added to the primary side of the transformer. A switch directs current through the capacitor prior to commutation, allowing the capacitor to absorb the transformer's leakage inductance energy and lower the primary side voltage. Other suitable components, such as resistors, diodes, transistors, or additional transformer windings, may also be used to reduce the primary-side voltage prior to commutation.
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公开(公告)号：US20160141948A1
公开(公告)日：2016-05-19
申请号：US14542231
申请日：2014-11-14
Applicant: Keithley Instruments, Inc.
Inventor： Wayne C. Goeke
Abstract: A switching power supply can include multiple power MOSFETs that receive an initial gate drive waveform comprising a fast slew rate region having a negative slope and a slow slew rate region also having a negative slope. The MOSFETs can turn off during the slow slew rate region of the initial gate drive waveform.
Abstract translation: 开关电源可以包括多个功率MOSFET，其接收包括具有负斜率的快速压摆率区域和也具有负斜率的慢压摆率区域的初始栅极驱动波形。 在初始栅极驱动波形的缓慢转换速率区域，MOSFET可能会关闭。
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公开(公告)号：US09197236B1
公开(公告)日：2015-11-24
申请号：US14568904
申请日：2014-12-12
Applicant: Keithley Instruments, Inc.
Inventor： Wayne C. Goeke , Brian P. Frackelton , Benjamin J. Yurick
CPC classification number: H03M1/20 , G01R13/0254 , G01R13/0272 , G01R19/2509 , H03M1/005 , H03M1/0634 , H03M1/0658 , H03M1/1245 , H03M1/1265
Abstract: A method for producing sampled data, which as the requested sampling period is increased, each sample is the average of an increasing number of ADC samples such that a maximum number of ADC samples are evenly space across the sample period. The method can include choosing one of multiple ADC with varying speed versus resolution capabilities to further increase the quality of the sampled data as the sampling period increases.
Abstract translation: 一种用于产生采样数据的方法，其随着所请求的采样周期的增加，每个样本是越来越多的ADC采样的平均值，使得ADC采样的最大数量在采样周期内是均匀的空间。 该方法可以包括选择具有不同速度与分辨率能力的多个ADC中的一个，以在采样周期增加时进一步提高采样数据的质量。
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公开(公告)号：US20140354354A1
公开(公告)日：2014-12-04
申请号：US13906051
申请日：2013-05-30
Applicant: Keithley Instruments, Inc.
Inventor： Wayne C. Goeke
IPC: H03F3/45
CPC classification number: H03F3/45 , H03F1/303 , H03F3/38 , H03F3/45475
Abstract: A circuit can include operational amplifier having a first input, a second input, and an output, first and second resistors in series between the output of the op-amp and a ground, and multiple switches configurable to toggle the circuit between a positive phase and a negative phase.
Abstract translation: 电路可以包括运算放大器，其具有第一输入，第二输入和输出，串联在运算放大器的输出和地之间的第一和第二电阻器，以及多个开关，其可配置为在正相和 一个负相。
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Patent Agency Ranking
6.发明申请公开(公告)号：US20140347158A1
公开(公告)日：2014-11-27
申请号：US13902004
申请日：2013-05-24
Applicant: Keithley Instruments, Inc.
Inventor： Wayne C. Goeke , John C. Gibbons
IPC: H01F27/36
CPC classification number: H01F27/362 , H01F27/288 , H01F2027/2833
Abstract: An isolated DC-to-DC switching power supply includes an isolation transformer having a magnetic core, a first winding around the magnetic core, a first winding-shield around the magnetic core, a second winding-shield within the first winding-shield, and a second winding within the second winding-shield. There is no direct coupling between the first winding and the second winding since the second winding is enclosed within the second winding-shield and the second winding-shield is enclosed within the first winding-shield.
Abstract translation: 隔离的DC-DC开关电源包括具有磁芯的隔离变压器，围绕磁芯的第一绕组，围绕磁芯的第一绕组屏蔽，第一绕组屏蔽内的第二绕组屏蔽，以及 在第二绕组屏蔽内的第二绕组。 第一绕组和第二绕组之间没有直接耦合，因为第二绕组被封闭在第二绕组屏蔽内，而第二绕组屏蔽封闭在第一绕组屏蔽内。
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公开(公告)号：US20160118899A1
公开(公告)日：2016-04-28
申请号：US14523745
申请日：2014-10-24
Applicant: Keithley Instruments, Inc.
Inventor： Wayne C. Goeke
IPC: H02M3/335
CPC classification number: H02M3/33507 , H02M1/40 , H02M3/3372
Abstract: A method of magnetization balancing for a switching power supply having at least two MOSFETs can include measuring first and second commutation times, adjusting the timing of the on time (pulse width) of the first MOSFET's gate relative to the on time (pulse width) of the second MOSFET's gate, and determining whether the commutation times are equal.
Abstract translation: 用于具有至少两个MOSFET的开关电源的磁化平衡方法可以包括测量第一和第二换向时间，调节第一MOSFET栅极的导通时间（脉冲宽度）的时序（脉冲宽度）相对于导通时间 第二MOSFET的栅极，并确定换向时间是否相等。
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公开(公告)号：US09274145B2
公开(公告)日：2016-03-01
申请号：US13657549
申请日：2012-10-22
Applicant: Keithley Instruments, Inc.
Inventor： Wayne C. Goeke
CPC classification number: G01R1/203 , G01R19/0023 , G01R19/0092 , H03F1/34 , H03F3/45475 , H03F2200/261 , H03F2203/45138
Abstract: An active shunt ammeter for measuring current flowing through a device under test (DUT) and method are disclosed. The active shunt ammeter includes an input configured to receive an input signal having a frequency within a frequency band and representing the current flowing through the DUT. An output is configured to generate an output voltage representing the current flowing through the DUT. The active shunt ammeter also includes a gain circuit having an amplifier with a gain characteristic that varies respect to frequency within the frequency band and a feedback element having an impedance coupled from an output of the gain circuit to a negative input of the gain circuit, the feedback element impedance being configured to change with frequency to correlate with the amplifier gain characteristic such that the feedback element impedance divided by the amplifier gain over the frequency band has minimal frequency dependency.
Abstract translation: 公开了一种用于测量流过被测器件（DUT）的电流的主动分流电流表和方法。 主动分流电流表包括被配置为接收具有在频带内的频率并且表示流过DUT的电流的输入信号的输入。 输出被配置为产生表示流过DUT的电流的输出电压。 主动分流电流表还包括具有增益特性的放大器的增益电路，该放大器具有与频带内的频率相关的增益特性，以及具有从增益电路的输出耦合到增益电路的负输入的阻抗的反馈元件， 反馈元件阻抗被配置为随频率变化以与放大器增益特性相关，使得反馈元件阻抗除以频带上的放大器增益具有最小的频率依赖性。
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9.发明授权公开(公告)号：US09478351B2
公开(公告)日：2016-10-25
申请号：US13902004
申请日：2013-05-24
Applicant: Keithley Instruments, Inc.
Inventor： Wayne C. Goeke , John C. Gibbons
CPC classification number: H01F27/362 , H01F27/288 , H01F2027/2833
Abstract: An isolated DC-to-DC switching power supply includes an isolation transformer having a magnetic core, a first winding around the magnetic core, a first winding-shield around the magnetic core, a second winding-shield within the first winding-shield, and a second winding within the second winding-shield. There is no direct coupling between the first winding and the second winding since the second winding is enclosed within the second winding-shield and the second winding-shield is enclosed within the first winding-shield.
Abstract translation: 隔离的DC-DC开关电源包括具有磁芯的隔离变压器，围绕磁芯的第一绕组，围绕磁芯的第一绕组屏蔽，第一绕组屏蔽内的第二绕组屏蔽，以及 在第二绕组屏蔽内的第二绕组。 第一绕组和第二绕组之间没有直接耦合，因为第二绕组被封闭在第二绕组屏蔽内，而第二绕组屏蔽封闭在第一绕组屏蔽内。
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公开(公告)号：US09453880B2
公开(公告)日：2016-09-27
申请号：US14163725
申请日：2014-01-24
Applicant: Keithley Instruments, Inc.
Inventor： Wayne C. Goeke
IPC: G01R15/00 , G01R27/08 , G01R31/317 , G01R1/20
CPC classification number: G01R31/31721 , G01R1/203
Abstract: An active shunt source-measure unit (SMU) circuit can include an SMU or power supply having an active shunt circuit that is integrated with the current measuring sub-circuit of the SMU circuit. The active shunt circuit may be active during voltage sourcing of the SMU circuit and deactivated during current sourcing of the SMU circuit.
Abstract translation: 主动分流源测量单元（SMU）电路可以包括具有与SMU电路的电流测量子电路集成的有源分流电路的SMU或电源。 在SMU电路的电压源期间，有源分流电路可能有效，并且在SMU电路的电流源期间被禁用。
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