公开(公告)号：US09634844B2

公开(公告)日：2017-04-25

申请号：US14607608

申请日：2015-01-28

Applicant: Linear Technology Corporation

Inventor： Michael Paul ,  Jeffrey Heath ,  David Dwelley ,  Heath Stewart

IPC: G06F1/26 ,  H04L12/10

CPC classification number: H04L12/10 ,  G06F1/26

Abstract: In a method performed by a PoE system, a PSE is able to detect whether a PD is compatible for receiving power via four wire pairs in the standard Ethernet cable. The PSE provides a current limited voltage to a first and second pair of wires in the cable, during a detection phase, to detect a characteristic impedance of the PD. In the PSE, a first resistor is connected to a third wire pair and a second resistor is connected to a fourth wire pair. During the detection phase, the PSE detects the relative currents through the resistors. If the currents are the same, then the PSE knows the PD is able to receive power via the four wire pairs. The PSE then applies the full PoE voltage to the first and second wire pairs and connects the third and fourth wire pairs to a low voltage via a MOSFET.

公开(公告)号：US09634480B1

公开(公告)日：2017-04-25

申请号：US14486697

申请日：2014-09-15

Applicant: LINEAR TECHNOLOGY CORPORATION

Inventor： Daniel James Eddleman ,  Mitchell Edward Lee ,  Zhizhong Hou

IPC: H02H5/04 ,  H03K17/081 ,  H03K17/082 ,  H01C1/16 ,  H03K17/08

CPC classification number: H02H5/04 ,  H01C1/16 ,  H03K17/08104 ,  H03K17/0822 ,  H03K2017/0806

Abstract: A circuit for protecting a semiconductor element is provided in a system for supplying power from an input node to an output node. The circuit has an analog multiplier responsive to a voltage across the semiconductor element and a current flowing through the semiconductor element to produce an output voltage. A transconductance amplifier is coupled to an output of the analog multiplier for receiving the output voltage of the analog multiplier to produce an output current. An analog RC circuit coupled to the output of the transconductance amplifier is configurable to include a selected number of resistive elements having selected resistance values and a selected number of capacitive elements having selected capacitance values. The configuration of the RC circuit is carried out to provide an RC thermal model that reproduces a desired thermal behavior of the semiconductor element. The RC circuit is responsive to the output current of the transconductance amplifier to produce an output voltage used to control the semiconductor element.

公开(公告)号：US09596728B2

公开(公告)日：2017-03-14

申请号：US15147842

申请日：2016-05-05

Applicant: LINEAR TECHNOLOGY CORPORATION

Inventor： Joshua William Caldwell ,  Dongwon Kwon ,  Lucas Andrew Milner

IPC: H05B33/08 ,  H02M3/156 ,  H02M3/337

CPC classification number: H05B33/0815 ,  H02M3/04 ,  H02M3/156 ,  H02M3/3376 ,  H02M2001/0012 ,  H02M2001/0025 ,  H02M2001/0045 ,  H02M2001/0096 ,  H05B33/0812 ,  H05B33/0845 ,  H05B33/0857

Abstract: A method and system of driving an LED load. A driver is configured to deliver a level of current indicated by a control signal to the LED load when a PWM signal is ON and stop delivering the level of current when the PWM signal is OFF. An output capacitance element is coupled across a differential output of the LED driver. A feedback path, having a store circuit, is configured to store an information indicative of a first voltage level across the output capacitance element as a stored feedback reference signal just after the PWM signal is turned OFF. The feedback path causes the voltage across the output capacitance element to be at the first voltage level just before the PWM signal is turned ON.

Abstract translation: 驱动LED负载的方法和系统。 驱动器被配置为当PWM信号为ON时将控制信号指示的电流电平传递给LED负载，并且当PWM信号为OFF时停止传送电流电平。 输出电容元件跨越LED驱动器的差分输出耦合。 具有存储电路的反馈路径被配置为在PWM信号关闭之后存储指示输出电容元件上的第一电压电平的信息作为存储的反馈参考信号。 反馈路径使得输出电容元件两端的电压在PWM信号接通之前处于第一电压电平。

公开(公告)号：US09535437B1

公开(公告)日：2017-01-03

申请号：US14054516

申请日：2013-10-15

Applicant: Linear Technology Corporation

Inventor： David Dwelley ,  Jeffrey Heath ,  Kirk Su

IPC: G05F1/10 ,  H04L12/24 ,  B60R16/03 ,  H04L12/10

CPC classification number: G05F1/10 ,  B60R16/03 ,  G05F1/462 ,  H04L12/10 ,  H04L41/0681 ,  Y02D30/30 ,  Y02D30/32

Abstract: In a PoE system in an automobile, Power Source Equipment (PSE) is connected to Powered Devices (PDs) to provide data and power via Ethernet wires. When the ignition switch is on, the full PSE voltage, such as 44 volts, is supplied to the PDs, and the voltage is regulated by the PDs to power one or more loads in the PD. During a standby mode, such as when the ignition switch is off, the PSE is controlled to output a lower voltage of, for example, 5 volts, and the voltage is regulated by the PDs to power the loads, such as processors, in a low power standby mode. The voltage regulator in the PD for the low power mode may be an efficient linear regulator, and the voltage regulator in the PD for the full voltage mode may be a switching regulator. Thus, there is improved efficiency.

Abstract translation: 在汽车的PoE系统中，电源设备（PSE）连接到有源设备（PD），以通过以太网电线提供数据和电源。 当点火开关打开时，全部PSE电压（例如44伏特）被提供给PD，并且电压由PD调节以为PD中的一个或多个负载供电。 在待机模式期间，例如当点火开关关闭时，PSE被控制以输出例如5伏特的较低电压，并且电压由PD调节以对负载（例如处理器）供电，在 低功耗待机模式。 用于低功耗模式的PD中的电压调节器可以是高效的线性稳压器，并且用于全电压模式的PD中的稳压器可以是开关稳压器。 因此，提高了效率。

公开(公告)号：US09448960B2

公开(公告)日：2016-09-20

申请号：US13828511

申请日：2013-03-14

Applicant: LINEAR TECHNOLOGY CORPORATION

Inventor： Daniel James Eddleman

IPC: G06F13/42

CPC classification number: G06F13/4291

Abstract: A novel readdressing circuit is provided for supporting data communications over a data line and a clock line between at least one master device and multiple slave devices. For example, the master device and the multiple slave devices may be configured to communicate over an I2C bus including the data line and the clock line. The readdressing circuit has a data input node for receiving a data signal transferred over the data line and including an address word produced by the master device, and a data output node coupled to the multiple slave devices. The readdressing circuit also includes an address generator and an address transmit detections circuit. The address generator is configured for storing a multi-bit fixed offset value. The address generator is responsive to the address word at the data input node for generating multiple unique addresses for the multiple slave devices. The address transmit detection circuit is configured for enabling the address generator to generate the multiple unique addresses at the data output node when the address word is detected at the data input node, and for preventing an output signal of the address generator from being supplied to the data output node when no address word is detected at the data input node.

Abstract translation: 提供了一种新颖的再现电路，用于支持数据线上的数据通信和至少一个主设备与多个从设备之间的时钟线。 例如，主设备和多个从设备可以被配置为通过包括数据线和时钟线的I2C总线进行通信。 再现电路具有数据输入节点，用于接收通过数据线传输的数据信号，并包括由主设备产生的地址字，以及耦合到多个从设备的数据输出节点。 再现电路还包括地址发生器和地址发送检测电路。 地址发生器配置为存储多位固定偏移值。 地址发生器响应于数据输入节点处的地址字，用于为多个从设备生成多个唯一地址。 地址发送检测电路被配置为使得地址发生器能够在数据输出节点处检测到地址字时在数据输出节点处产生多个唯一地址，并且防止地址发生器的输出信号被提供给 数据输出节点在数据输入节点没有检测到地址字时。

公开(公告)号：US20160248327A1

公开(公告)日：2016-08-25

申请号：US15048511

申请日：2016-02-19

Applicant: LINEAR TECHNOLOGY CORPORATION

Inventor： Jian LI

IPC: H02M3/158

CPC classification number: H02M3/158 ,  H02M1/08 ,  H02M3/1584 ,  H02M2001/0009 ,  H02M2003/1566

Abstract: A power supply system includes a power source; a load device configured to receive power from the power source; and a power interface device coupled to the power source and the load device and configured to change a first voltage provided by the power source to a second voltage for operating the load device. The power interface device include a main switching converter configured to operate at a first switching frequency and source low frequency current to the load device and an auxiliary switching converter coupled in parallel with the main switching converter and configured to operate at a second and different switching frequency and source fast transient high frequency current to the load device.

Abstract translation: 电源系统包括电源; 被配置为从所述电源接收电力的负载装置; 以及耦合到所述电源和所述负载装置并且被配置为将由所述电源提供的第一电压改变为用于操作所述负载装置的第二电压的电力接口装置。 电力接口装置包括：主开关转换器，被配置为以负载装置的第一开关频率和源低频电流工作，以及与主开关转换器并联耦合的辅助开关转换器，并且被配置为在第二和不同的开关频率 并向负载设备提供快速瞬态高频电流源。

公开(公告)号：US09374050B1

公开(公告)日：2016-06-21

申请号：US14610597

申请日：2015-01-30

Applicant: LINEAR TECHNOLOGY CORPORATION

Inventor： Joseph Adut ,  John Perry Myers

IPC: H03F3/45

CPC classification number: H03F3/45502 ,  H03F3/45201 ,  H03F2203/45081 ,  H03F2203/45082

Abstract: A differential amplifier may, when connected to a positive or negative supply voltage and to a ground voltage, provide a differential pair of outputs signals at a differential output that are an amplification of a differential pair of input signals at a differential input. A differential input stage may receive the differential pair of input signals from the differential input and may include a first transistor associated with one of the input signals and a second transistor associated with the other input signal. A differential output stage may generate the differential pair of output signals at the differential output and may include a third transistor associated with one of the output signals and a fourth transistor associated with the other output signal. The first, second, third, and fourth transistors may be all P type or all N type. The differential pair of output signals may have a common mode that is: near the ground voltage when the first, second, third, and fourth transistors are all N type and the supply voltage is positive with respect to the ground voltage; near the supply voltage when the first, second, third, and fourth transistors are all P type and the supply voltage is positive with respect to the ground voltage; near the ground voltage when the first, second, third, and fourth transistors are all P type and the supply voltage is negative with respect to the ground voltage; or near the supply voltage when the first, second, third, and fourth transistors are all N type and the supply voltage is negative with respect to the ground voltage.

Abstract translation: 当差分放大器连接到正或负电源电压和接地电压时，可以在差分输出端提供差分输出信号差分输出信号，差分输出信号是差分输入端的差分输入信号对的放大。 差分输入级可以接收来自差分输入的差分输入信号对，并且可以包括与输入信号之一相关联的第一晶体管和与另一输入信号相关联的第二晶体管。 差分输出级可以在差分输出处产生差分输出信号对，并且可以包括与输出信号之一相关联的第三晶体管和与另一输出信号相关联的第四晶体管。 第一，第二，第三和第四晶体管可以是全P型或全N型。 输出信号的差分对可以具有共模，即当第一，第二，第三和第四晶体管都为N型时，接地电压附近，并且电源电压相对于接地电压为正; 当第一，第二，第三和第四晶体管都为P型并且电源电压相对于接地电压为正时在电源电压附近; 当第一，第二，第三和第四晶体管都为P型并且电源电压相对于接地电压为负时，接地电压附近; 或者当第一，第二，第三和第四晶体管都为N型并且电源电压相对于接地电压为负时，接近电源电压。

公开(公告)号：US09348347B2

公开(公告)日：2016-05-24

申请号：US13969865

申请日：2013-08-19

Applicant: Linear Technology Corporation

Inventor： Robert Dobkin ,  Amitkumar Pravin Patel

IPC: H02M3/156 ,  G05F1/575 ,  G05F1/565 ,  H02M1/08 ,  G05F1/56 ,  G05F1/573 ,  H02M3/158

CPC classification number: G05F1/56 ,  G05F1/565 ,  G05F1/573 ,  G05F1/575 ,  H02M1/08 ,  H02M3/156 ,  H02M3/1588

Abstract: In one embodiment, a regulator circuit for generating a regulated output voltage Vout has an error amplifier using a pair of bipolar transistors at its front end. The error amplifier compares the regulated output voltage to a reference voltage Vref. A precision current source draws a first current through a user-selected set resistance to generate the desired Vref. The regulator circuit controls a power stage to cause Vout to be equal to Vref. The base current into one of the bipolar transistors normally distorts the current through the set resistance. A base current compensation circuit is coupled to the current source to adjust the first current by a value equal to the base current to offset the base current. Therefore, Vref is not affected by the base current. The error amplifier may be in a linear regulator or a switching regulator. The compensation circuit may be used in other applications.

Abstract translation: 在一个实施例中，用于产生调节输出电压Vout的调节器电路在其前端具有使用一对双极晶体管的误差放大器。 误差放大器将稳压输出电压与参考电压Vref进行比较。 精密电流源通过用户选择的设定电阻画出第一电流以产生所需的Vref。 调节器电路控制功率级以使Vout等于Vref。 进入一个双极晶体管的基极电流通常使电流扭曲设定电阻。 基极电流补偿电路耦合到电流源，以将第一电流调整为等于基极电流的值以抵消基极电流。 因此，Vref不受基极电流的影响。 误差放大器可以在线性调节器或开关调节器中。 补偿电路可用于其他应用。

公开(公告)号：US09330283B2

公开(公告)日：2016-05-03

申请号：US14092131

申请日：2013-11-27

Applicant: Linear Technology Corporation

Inventor： Michael Hendrikus Laurentius Kouwenhoven

IPC: G06G7/20 ,  H02M7/217 ,  G01R19/02 ,  G01R21/10

CPC classification number: G06G7/20 ,  G01R19/02 ,  G01R21/10 ,  H02M7/217

Abstract: An RMS-DC converter includes a chopper-stabilized square cell that eliminates offset, thus enabling high-bandwidth operation. The chopper-stabilized offset requires only a small portion of the circuitry (i.e., a single component square cell) which operates at high frequencies, and is amenable to using high-bandwidth component square cells. Using the chopping technique minimizes required device sizes without compromising an acceptable square cell dynamic range, thereby maximizing the square cell bandwidth. The RMS-DC converter consumes less power than conventional RMS-to-DC converters that requires a high-frequency variable gain amplifier.

Abstract translation: RMS-DC转换器包括消除偏移的斩波稳定的方形单元，从而实现高带宽操作。 斩波稳定的偏移仅需要在高频下工作的电路（即，单个分量方形小区）的一小部分，并且可以使用高带宽分量方形小区。 使用斩波技术最小化所需的设备尺寸，而不会影响可接受的平方单元动态范围，从而最大化平方单元带宽。 与需要高频可变增益放大器的常规RMS-DC转换器相比，RMS-DC转换器的功耗更低。

公开(公告)号：US09305700B2

公开(公告)日：2016-04-05

申请号：US13862200

申请日：2013-04-12

Applicant: Linear Technology Corporation

Inventor： Eko Tan Lisuwandi

IPC: H02J7/00 ,  H02J7/14 ,  H01F38/14 ,  H02J7/02 ,  H04B5/00 ,  H01M10/44 ,  B60L11/18

CPC classification number: H01F38/14 ,  B60L11/1853 ,  H01M10/441 ,  H02J5/005 ,  H02J7/0016 ,  H02J7/0024 ,  H02J7/0052 ,  H02J7/025 ,  H02J50/12 ,  H04B5/0037

Abstract: An auto-resonant driver for a transmitter inductor drives the inductor at an optimal frequency for maximum efficiency. The transmitter inductor is magnetically coupled, but not physically coupled, to a receiver inductor, and the current generated by the receiver inductor is used to power a load. The system may be used, for example, to remotely charge a battery (as part of the load) or provide power to motors or circuits. A feedback circuit is used to generate the resonant driving frequency. A detector in the transmit side wirelessly detects whether there is sufficient current being generated in the receiver side to achieve regulation by a voltage regulator powering the load. This point is achieved when the transmitter inductor peak voltage suddenly increases as the driving pulse width is ramped up. At that point, the pulse width is held constant for optimal efficiency.

Abstract translation: 用于发射器电感的自谐振驱动器以最佳频率驱动电感器以获得最大效率。 发射器电感器与接收器电感器磁耦合但不物理耦合，并且由接收器电感器产生的电流用于为负载供电。 该系统可以用于例如远程为电池充电（作为负载的一部分）或向电动机或电路提供电力。 使用反馈电路来产生谐振驱动频率。 发射侧的检测器无线地检测在接收机侧是否产生足够的电流，以通过为负载供电的电压调节器来实现调节。 当发射电感峰值电压随着驱动脉冲宽度的上升而突然增加时，就达到了这一点。 此时，脉冲宽度保持恒定，以达到最佳效率。