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公开(公告)号：US09876450B2
公开(公告)日：2018-01-23
申请号：US14604589
申请日：2015-01-23
Applicant: Marvell World Trade, Ltd.
Inventor： Yichao Wang , Ravishanker Krishnamoorthy , Kong Yin Leong
Abstract: An apparatus includes a clamp control circuit configured to control a first current to have a magnitude substantially equal to that of a second current when the second current has a first flow direction. The clamp control circuit is configured to control the first current to be substantially zero when the second current has a second flow direction. A method includes determining a value of a first current, controlling a second current to have a substantially zero value when the first current flows in a first direction, and controlling the second current to have a magnitude substantially equal to that of the first current when the first current flows in a second direction. The first current flows in the first direction when a winding of a motor is being supplied with energy and flows in the second direction when the winding of the motor is discharging energy.
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公开(公告)号：US09425721B2
公开(公告)日：2016-08-23
申请号：US14338908
申请日：2014-07-23
Applicant: Marvell World Trade LTD.
Inventor： Ravishanker Krishnamoorthy , Edy Susanto , Cheng Yong Teoh , Foo Leng Leong
Abstract: A system including memory to store a plurality of sets of values, where each set is used to control speed of a different type of motor. A pulse width modulation (PWM) module receives an input indicating a type of motor sensed in the system, selects a set corresponding to the type of the sensed motor, and generates, based on the selected set, a pulse width modulation signal to control speed of the sensed motor. A speed module receives a requested speed for the sensed motor and generates an output indicating a range of speed corresponding to the requested speed. The PWM module selects, based on the range of speed, a value from the selected set; shifts, based on the selected value, the pulse width modulation signal; and adjusts, based on the shifted pulse width modulation signal, the speed of the sensed motor by adjusting torque applied to the sensed motor.
Abstract translation: 一种包括用于存储多组值的存储器的系统，其中每组用于控制不同类型的电动机的速度。 脉冲宽度调制（PWM）模块接收指示在系统中感测到的电动机的类型的输入，选择与感测到的电动机的类型相对应的一组，并且基于所选择的组生成用于控制速度的脉宽调制信号 的感应电动机。 速度模块接收所感测的电动机的请求速度，并产生指示对应于所请求速度的速度范围的输出。 PWM模块根据速度范围选择来自所选组的值; 基于选择的值移位脉宽调制信号; 并且通过调整施加到感测到的电动机的转矩，基于移动的脉宽调制信号来调整感测电动机的速度。
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公开(公告)号：US09408274B2
公开(公告)日：2016-08-02
申请号：US14180990
申请日：2014-02-14
Applicant: Marvell World Trade LTD.
Inventor： Sehat Sutardja , Ravishanker Krishnamoorthy
CPC classification number: H05B33/086 , F21K9/64 , H05B33/0827 , H05B33/083 , H05B33/0845 , H05B33/0857 , H05B33/0863 , H05B33/0866 , H05B37/02
Abstract: A system including a first set of light emitting diodes, a second set of light emitting diodes, and a control module. The first set of light emitting diodes is configured to emit blue light having first wavelengths in a first wavelength range in a spectrum of blue light. The first set of light emitting diodes includes a green phosphor configured to convert the blue light having the first wavelengths to green light. The second set of light emitting diodes is configured to emit blue light having second wavelengths in a second wavelength range in the spectrum of blue light. The second set of light emitting diodes includes a red phosphor configured to convert the blue light having the second wavelengths to red light. The first wavelength range is less than the second wavelength range. The control module is configured to control currents through the first set of light emitting diodes and the second set of light emitting diodes.
Abstract translation: 一种包括第一组发光二极管，第二组发光二极管和控制模块的系统。 第一组发光二极管被配置为在蓝光光谱中发射具有第一波长范围中的第一波长的蓝光。 第一组发光二极管包括被配置为将具有第一波长的蓝光转换成绿光的绿色荧光体。 第二组发光二极管被配置为在蓝光光谱中发射具有第二波长范围的第二波长的蓝光。 第二组发光二极管包括配置成将具有第二波长的蓝光转换成红光的红色荧光体。 第一波长范围小于第二波长范围。 控制模块被配置为控制通过第一组发光二极管和第二组发光二极管的电流。
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4.发明授权Current balancing circuits for light-emitting-diode-based illumination systems 有权用于基于发光二极管的照明系统的电流平衡电路
公开(公告)号：US09241385B2
公开(公告)日：2016-01-19
申请号：US14507200
申请日：2014-10-06
Applicant: Marvell World Trade LTD.
Inventor： Sehat Sutardja , Ravishanker Krishnamoorthy
CPC classification number: H05B33/086 , F21K9/64 , H05B33/0827 , H05B33/083 , H05B33/0845 , H05B33/0857 , H05B33/0863 , H05B33/0866 , H05B37/02
Abstract: A system including a plurality of switches and a comparator. The plurality of switches is configured to respectively supply a plurality of currents via respective terminals to a plurality of sets of light emitting diodes. The sets of light emitting diodes are configured to respectively output light having wavelengths in a plurality of wavelength ranges in a spectrum of blue light. The comparator is configured to compare a reference voltage to a voltage at one of the terminals of one of the plurality of switches connected to one of the sets of light emitting diodes, and to adjust, based on the comparison, biasing of the plurality of switches to maintain a predetermined ratio of the plurality of currents.
Abstract translation: 一种包括多个开关和比较器的系统。 多个开关被配置为分别经由各个端子将多个电流提供给多组发光二极管。 发光二极管组被配置为分别在蓝光光谱中输出具有多个波长范围的波长的光。 比较器被配置为将参考电压与连接到一组发光二极管的多个开关中的一个开关的一个端子处的电压进行比较，并且基于比较来调整多个开关的偏置 以保持多个电流的预定比率。
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公开(公告)号：US20140075229A1
公开(公告)日：2014-03-13
申请号：US14076872
申请日：2013-11-11
Applicant: Marvell World Trade Ltd.
Inventor： Ravishanker Krishnamoorthy , Yun Yang , Abdul Elaydi
IPC: G06F1/32
CPC classification number: G06F1/3234 , G06F1/3203 , G06F1/3206 , G11B25/043 , G11B33/121
Abstract: A hard disk drive enters a low power mode to reduce power consumption. To maintain communication with a host device, a communication interface remains energized along with a circuit portion storing configuration data for the communication interface. To energize the communication interface and the circuit portion, low power voltage regulators provide suitable reference voltages. One low power voltage regulator is dedicated to this purpose. Another voltage regulator is converted from an active, switching mode to a low power, linear mode to provide the necessary reference voltage. Also, unique handshaking signals are used to control entry and exit from the low power mode by the hard disk drive.
Abstract translation: 硬盘驱动器进入低功耗模式以降低功耗。 为了保持与主机设备的通信，通信接口与存储用于通信接口的配置数据的电路部分保持通电。 为了激励通信接口和电路部分，低功率稳压器提供合适的参考电压。 一个低功率稳压器专用于此目的。 另一个电压调节器从有源切换模式转换为低功率线性模式，以提供必要的参考电压。 此外，独特的握手信号用于控制硬盘驱动器从低功耗模式的进入和退出。
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公开(公告)号：US09502957B2
公开(公告)日：2016-11-22
申请号：US14289922
申请日：2014-05-29
Applicant: Marvell World Trade LTD.
Inventor： Ravishanker Krishnamoorthy , Radu Pitigoi-Aron , Siew Yong Chui
CPC classification number: H02M1/36 , H02M7/217 , H02M7/2176
Abstract: A system including a switch and a control circuit. The switch is configured to receive a first voltage. The control circuit is configured to, during a rising portion of a half cycle of the first voltage, (i) turn on the switch in response to the first voltage reaching a first value, and (ii) turn off the switch in response to the first voltage reaching a second value, where the second value is greater than the first value. The control circuit is further configured to, during a falling portion of the half cycle of the first voltage, (i) turn on the switch in response to the first voltage reaching the second value, and (ii) turn off the switch in response to the first voltage reaching the first value.
Abstract translation: 一种包括开关和控制电路的系统。 开关被配置为接收第一电压。 控制电路被配置为在第一电压的半周期的上升部分期间，（i）响应于第一电压达到第一值而导通开关，以及（ii）响应于开关 第一电压达到第二值，其中第二值大于第一值。 控制电路还被配置为在第一电压的半周期的下降部分期间，（i）响应于第一电压达到第二值而导通开关，以及（ii）响应于 第一个电压达到第一个值。
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公开(公告)号：US09334870B2
公开(公告)日：2016-05-10
申请号：US13708800
申请日：2012-12-07
Applicant: Marvell World Trade Ltd.
Inventor： Ravishanker Krishnamoorthy , Foo Leng Leong , Edy Susanto
CPC classification number: F04D27/001 , F04D27/006
Abstract: Embodiments of the present disclosure provide a method that comprises, based upon receipt of a mode command, changing an operating mode of a fan motor controller of a fan to a serial port communication protocol, programming a memory of the fan motor controller with an operating parameter of the fan, and based upon receipt of a serial port command, changing the operating mode of the fan motor controller from the serial port communication protocol to another protocol.
Abstract translation: 本公开的实施例提供一种方法，其包括：基于接收到模式命令，将风扇的风扇电动机控制器的操作模式改变为串行端口通信协议，使用操作参数来编程风扇电动机控制器的存储器 的风扇，并且基于接收到串行端口命令，将风扇电动机控制器的操作模式从串行端口通信协议改变为另一协议。
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公开(公告)号：US09329660B2
公开(公告)日：2016-05-03
申请号：US14076872
申请日：2013-11-11
Applicant: Marvell World Trade Ltd.
Inventor： Ravishanker Krishnamoorthy , Yun Yang , Abdul Elaydi
CPC classification number: G06F1/3234 , G06F1/3203 , G06F1/3206 , G11B25/043 , G11B33/121
Abstract: A hard disk drive enters a low power mode to reduce power consumption. To maintain communication with a host device, a communication interface remains energized along with a circuit portion storing configuration data for the communication interface. To energize the communication interface and the circuit portion, low power voltage regulators provide suitable reference voltages. One low power voltage regulator is dedicated to this purpose. Another voltage regulator is converted from an active, switching mode to a low power, linear mode to provide the necessary reference voltage. Also, unique handshaking signals are used to control entry and exit from the low power mode by the hard disk drive.
Abstract translation: 硬盘驱动器进入低功耗模式以降低功耗。 为了保持与主机设备的通信，通信接口与存储用于通信接口的配置数据的电路部分保持通电。 为了激励通信接口和电路部分，低功率稳压器提供合适的参考电压。 一个低功率稳压器专用于此目的。 另一个电压调节器从有源切换模式转换为低功率线性模式，以提供必要的参考电压。 此外，独特的握手信号用于控制硬盘驱动器从低功耗模式的进入和退出。
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公开(公告)号：US20140159600A1
公开(公告)日：2014-06-12
申请号：US14181042
申请日：2014-02-14
Applicant: Marvell World Trade LTD.
Inventor： Sehat Sutardja , Ravishanker Krishnamoorthy
IPC: H05B33/08
CPC classification number: H05B33/086 , F21K9/64 , H05B33/0827 , H05B33/083 , H05B33/0845 , H05B33/0857 , H05B33/0863 , H05B33/0866 , H05B37/02
Abstract: A lamp including a first set of light emitting diodes configured to generate first light, a second set of light emitting diodes configured to generate second light, and a third set of light emitting diodes configured to generate third light. The first light, the second light, and the third light combine to produce white light. A first switch is located at a base portion of the lamp. The state of the first switch corresponds to a color temperature of the white light. A color temperature adjustment module is configured to vary outputs of the first, second, and third sets of light emitting diodes in accordance with the color temperature of the white light selected by a user using the first switch.
Abstract translation: 一种灯，包括被配置为产生第一光的第一组发光二极管，被配置为产生第二光的第二组发光二极管和被配置为产生第三光的第三组发光二极管。 第一个光，第二个光和第三个光结合起来产生白光。 第一开关位于灯的基部。 第一开关的状态对应于白光的色温。 颜色温度调节模块被配置为根据由用户使用第一开关选择的白光的色温来改变第一组，第二组和第三组发光二极管的输出。
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10.发明申请CURRENT BALANCING CIRCUITS FOR LIGHT-EMITTING-DIODE-BASED ILLUMINATION SYSTEMS 有权用于发光二极管照明系统的电流平衡电路
公开(公告)号：US20140159595A1
公开(公告)日：2014-06-12
申请号：US14180934
申请日：2014-02-14
Applicant: Marvell World Trade LTD.
Inventor： Sehat Sutardja , Ravishanker Krishnamoorthy
IPC: H05B33/08
CPC classification number: H05B33/0857 , F21K9/64 , F21Y2101/00 , F21Y2113/13 , F21Y2115/10 , H05B33/0821 , H05B33/0827 , H05B33/083 , H05B33/086 , H05B33/0866
Abstract: A system includes first, second, and third sets of LEDs and a control module. The first set of LEDs outputs light having wavelengths in a wavelength range in a spectrum of ultraviolet light and is coated with a phosphor to convert the ultraviolet light to blue light having wavelengths in a wavelength range in a spectrum of blue light. The second and third sets of LEDs output light having wavelengths in a wavelength range in the spectrum of blue light and is coated with phosphors to convert the blue light to light having wavelengths in a wavelength range in a spectrum of green, yellow, and red light. The second set of LEDs generates less red light than green light. The third set of LEDs generates less green light than red light. The current control module controls currents through the first, second, and third sets of LEDs to generate white light.
Abstract translation: 一种系统包括第一组，第二组和第三组LED以及控制模块。 第一组LED输出具有紫外光谱波长范围内的波长的光，并且用磷光体涂覆以将紫外光转换成蓝色光谱波长范围内的波长的蓝色光。 第二组和第三组LED输出具有在蓝光光谱中的波长范围内的波长的光并且涂覆有荧光体以将蓝色光转换成具有在绿色，黄色和红色光谱的波长范围内的波长的光 。 第二组LED比绿色光产生较少的红光。 第三组LED比红色光产生较少的绿色光。 电流控制模块控制通过第一组，第二组和第三组LED的电流以产生白光。
