公开(公告)号：US20130076252A1

公开(公告)日：2013-03-28

申请号：US13548624

申请日：2012-07-13

Applicant: Bin Shao ,  Kenji Tomiyoshi

Inventor： Bin Shao ,  Kenji Tomiyoshi

IPC: H05B33/08 ,  G05F1/46

CPC classification number: H05B33/0842 ,  G05F1/46 ,  H05B33/0824

Abstract: The present disclosure proposes a fully integrated accurate LED output current controlling circuit and method, which can be seamlessly combined with true PWM dimming. The current controlling circuit has an auto zero function in the light-emitting diode driver to eliminate offsets caused by the system, process variations, parasitic effects, dimming and so on in an LED driver application, and thus is capable of controlling the LED current with high accuracy. Moreover, the driver of the present disclosure does not require the use of external components such as an external resistor to regulate current accuracy.

Abstract translation: 本公开提出了一种完全集成的准确的LED输出电流控制电路和方法，其可以与真实的PWM调光无缝组合。 电流控制电路在发光二极管驱动器中具有自动调零功能，以消除LED驱动器应用中由系统引起的偏移，工艺变化，寄生效应，调光等，从而能够控制LED电流 高准确率。 此外，本公开的驱动器不需要使用诸如外部电阻器的外部组件来调节电流精度。

公开(公告)号：US08981667B2

公开(公告)日：2015-03-17

申请号：US13548624

申请日：2012-07-13

Applicant: Bin Shao ,  Kenji Tomiyoshi

Inventor： Bin Shao ,  Kenji Tomiyoshi

IPC: G05F1/00 ,  H05B37/02 ,  H05B39/04 ,  H05B41/36 ,  H05B33/08 ,  G05F1/46

CPC classification number: H05B33/0842 ,  G05F1/46 ,  H05B33/0824

Abstract: The present disclosure proposes a fully integrated accurate LED output current controlling circuit and method, which can be seamlessly combined with true PWM dimming. The current controlling circuit has an auto zero function in the light-emitting diode driver to eliminate offsets caused by the system, process variations, parasitic effects, dimming and so on in an LED driver application, and thus is capable of controlling the LED current with high accuracy. Moreover, the driver of the present disclosure does not require the use of external components such as an external resistor to regulate current accuracy.

Abstract translation: 本公开提出了一种完全集成的准确的LED输出电流控制电路和方法，其可以与真实的PWM调光无缝组合。 电流控制电路在发光二极管驱动器中具有自动调零功能，以消除LED驱动器应用中由系统引起的偏移，工艺变化，寄生效应，调光等，从而能够控制LED电流 高准确率。 此外，本公开的驱动器不需要使用诸如外部电阻器的外部组件来调节电流精度。

公开(公告)号：US08345394B2

公开(公告)日：2013-01-01

申请号：US12573501

申请日：2009-10-05

Applicant: James W. Zhao ,  Reed W. Adams ,  Kenji Tomiyoshi ,  Bin Shao ,  Atsushi Matamura ,  Yogesh Sharma ,  Todd Thomas

Inventor： James W. Zhao ,  Reed W. Adams ,  Kenji Tomiyoshi ,  Bin Shao ,  Atsushi Matamura ,  Yogesh Sharma ,  Todd Thomas

IPC: H02H9/00

CPC classification number: H01L27/0285 ,  H01L2924/0002 ,  H01L2924/00

Abstract: An ESD protection circuit for a switching power converter which includes a high-side switching element connected between a supply voltage and the switching node, and a low-side switching element connected between the switching node and a common node. A current conduction path couples an ESD event that occurs on the switching node to an ESD sense node, and an ESD sensing circuit coupled to the sense node generates a trigger signal when an ESD event is sensed. A first logic gate keeps the high-side switching element off when the trigger signal indicates the sensing of an ESD event, and a second logic gate causes the low-side switching element to turn on when an ESD event is sensed such that the low-side switching element provides a conductive discharge path between the switching node and common node.

Abstract translation: 一种用于开关电源转换器的ESD保护电路，包括连接在电源电压和开关节点之间的高侧开关元件，以及连接在开关节点和公共节点之间的低侧开关元件。 电流传导路径将在开关节点上发生的ESD事件耦合到ESD感测节点，并且耦合到感测节点的ESD感测电路在感测到ESD事件时产生触发信号。 当触发信号指示ESD事件的感测时，第一逻辑门保持高侧开关元件关闭，并且当检测到ESD事件时，第二逻辑门使低侧开关元件导通， 侧开关元件在开关节点和公共节点之间提供导电放电路径。

公开(公告)号：US07595622B1

公开(公告)日：2009-09-29

申请号：US11784184

申请日：2007-04-05

Applicant: Kenji Tomiyoshi ,  Tatsuya Sawa

Inventor： Kenji Tomiyoshi ,  Tatsuya Sawa

IPC: G05F1/46 ,  G05F1/575

CPC classification number: H05B33/0818 ,  H05B33/0842 ,  Y02B20/347

Abstract: A system and method are disclosed for maintaining an output voltage of a constant current source circuit. A constant current source circuit is provided that comprises a voltage regulator, a first feedback loop and a second feedback loop that are connected to the voltage regulator, and a sample and hold circuit that is connected to the second feedback loop. The voltage regulator regulates an output voltage VOUT to a reference voltage VREF using a first feedback voltage signal FB on the first feedback loop. The sample and hold circuit samples and holds a second feedback voltage signal VFB from the second feedback loop while the first feedback loop is connected. The voltage regulator regulates an output voltage VOUT to the second feedback reference voltage signal VFB when the first feedback loop is disconnected.

Abstract translation: 公开了一种用于维持恒定电流源电路的输出电压的系统和方法。 提供恒流源电路，其包括连接到电压调节器的电压调节器，第一反馈回路和第二反馈回路以及连接到第二反馈回路的采样和保持电路。 电压调节器使用第一反馈环路上的第一反馈电压信号FB将输出电压VOUT调节到参考电压VREF。 采样和保持电路在连接第一个反馈环路时采样并保持来自第二反馈环路的第二反馈电压信号VFB。 当第一反馈回路断开时，电压调节器将输出电压VOUT调节到第二反馈参考电压信号VFB。

公开(公告)号：US07952900B2

公开(公告)日：2011-05-31

申请号：US12104305

申请日：2008-04-16

Applicant: Kenji Tomiyoshi ,  Rei Hashimoto

Inventor： Kenji Tomiyoshi ,  Rei Hashimoto

IPC: H02M3/24 ,  H02M7/5387

CPC classification number: H02M3/1588 ,  H02M3/1582 ,  Y02B70/1466

Abstract: An H-bridge buck-boost converter includes a first half-bridge portion having at least one first transistor, an inductor portion connected to the first half-bridge portion at a first connection, a second half-bride portion connected to the inductor portion at a second connection, the second half-bridge portion having at least one second transistor, and a control portion configured to provide a first switching signal to a gate of the first transistor of the first half-bridge portion as a function of a voltage at the first connection.

Abstract translation: 一种H桥降压升压转换器包括：具有至少一个第一晶体管的第一半桥部分，在第一连接处连接到第一半桥部分的电感部分，连接到电感器部分的第二半新部分 第二连接，所述第二半桥部分具有至少一个第二晶体管，以及控制部分，被配置为将第一切换信号提供给所述第一半桥部分的所述第一晶体管的栅极，作为所述第一半桥部分的电压的函数 第一连接。

公开(公告)号：US07119522B1

公开(公告)日：2006-10-10

申请号：US11002544

申请日：2004-12-01

Applicant: Kenji Tomiyoshi

Inventor： Kenji Tomiyoshi

IPC: G05F1/40 ,  G05F1/613

CPC classification number: H02M3/1588 ,  H02M2001/0009 ,  Y02B70/1466

Abstract: A current mode PWM buck regulator is provided. The regulator includes a top-side transistor, a bottom-side transistor, an inductor, a sample-and-hold circuit, a ramp generator, a PWM comparator, an error amplifier, and a current sense amplifier. A current through the low-side transistor is sensed by the current sense amplifier. Also, a current sense voltage provided by the current sense amplifier is sampled when the low-side transistor is on, and held when the low-side transistor is off. The ramp generator is arranged to generate a voltage ramp that emulates the upslope of the inductor current. Additionally, the sampled low-side transistor current is combined with the voltage ramp. The PWM comparator is arranged to provide a PWM signal by comparing the voltage ramp to a comparison signal provided by the error amplifier.

Abstract translation: 提供电流模式PWM降压稳压器。 调节器包括顶侧晶体管，底侧晶体管，电感器，采样保持电路，斜坡发生器，PWM比较器，误差放大器和电流检测放大器。 通过电流读出放大器感测通过低端晶体管的电流。 此外，当低侧晶体管导通时，由电流检测放大器提供的电流检测电压被采样，并且当低侧晶体管截止时保持。 斜坡发生器布置成产生模拟电感器电流的上坡的电压斜坡。 此外，采样的低侧晶体管电流与电压斜坡组合。 PWM比较器被布置成通过将电压斜坡与由误差放大器提供的比较信号进行比较来提供PWM信号。

公开(公告)号：US07479812B1

公开(公告)日：2009-01-20

申请号：US11139902

申请日：2005-05-27

Applicant: George Adrian Hariman ,  Kenji Tomiyoshi

Inventor： George Adrian Hariman ,  Kenji Tomiyoshi

IPC: H03D3/00

CPC classification number: H03D13/005

Abstract: A feed-forward path is combined with a feed-back path to produce an output signal representation of an input signal frequency. The feed-forward path adjusts the output signal representation in response to a change in the input signal frequency, and does so in a response time that is independent of the feed-back path. Input frequencies can be represented as voltages, and first and second input frequency ranges which differ from one another can both be represented in the same range of voltages.

Abstract translation: 前馈路径与反馈路径组合以产生输入信号频率的输出信号表示。 前馈路径响应于输入信号频率的变化来调整输出信号表示，并且在独立于反馈路径的响应时间内进行。 输入频率可以表示为电压，并且彼此不同的第一和第二输入频率范围都可以在相同的电压范围内表示。

公开(公告)号：US07372241B1

公开(公告)日：2008-05-13

申请号：US11467529

申请日：2006-08-25

Applicant: Kenji Tomiyoshi

Inventor： Kenji Tomiyoshi

IPC: G05F1/56

CPC classification number: H02M3/1588 ,  H02M2001/0009 ,  Y02B70/1466

Abstract: A regulator is provided. The regulator includes a main switch, a synchronous switch, an inductor, a sample-and-hold circuit, a ramp generator, a PWM comparator, an error amplifier, and a current sense amplifier. A current through the synchronous switch is sensed by the current sense amplifier. Also, a current sense voltage provided by the current sense amplifier is sampled when the synchronous switch is on, and held when the synchronous switch is off. The ramp generator is arranged to generate a voltage ramp that emulates the slope of the inductor current while the synchronous switch is open. Additionally, the sampled synchronous switch current is combined with the voltage ramp. The PWM comparator is arranged to provide a PWM signal by comparing the voltage ramp to a comparison signal provided by the error amplifier.

Abstract translation: 提供调节器。 调节器包括主开关，同步开关，电感器，采样保持电路，斜坡发生器，PWM比较器，误差放大器和电流检测放大器。 通过同步开关的电流由电流检测放大器感测。 此外，当同步开关导通时，由电流检测放大器提供的电流检测电压被采样，并且当同步开关断开时保持。 斜坡发生器被布置成产生在同步开关断开时模拟电感器电流的斜率的电压斜坡。 此外，采样同步开关电流与电压斜坡组合。 PWM比较器被布置成通过将电压斜坡与由误差放大器提供的比较信号进行比较来提供PWM信号。

公开(公告)号：US20090262556A1

公开(公告)日：2009-10-22

申请号：US12104305

申请日：2008-04-16

Applicant: Kenji Tomiyoshi ,  Rei Hashimoto

Inventor： Kenji Tomiyoshi ,  Rei Hashimoto

IPC: H02M3/335

CPC classification number: H02M3/1588 ,  H02M3/1582 ,  Y02B70/1466

Abstract: An H-bridge buck-boost converter includes a first half-bridge portion having at least one first transistor, an inductor portion connected to the first half-bridge portion at a first connection, a second half-bride portion connected to the inductor portion at a second connection, the second half-bridge portion having at least one second transistor, and a control portion configured to provide a first switching signal to a gate of the first transistor of the first half-bridge portion as a function of a voltage at the first connection.

Abstract translation: 一种H桥降压升压转换器包括：具有至少一个第一晶体管的第一半桥部分，在第一连接处连接到第一半桥部分的电感部分，连接到电感器部分的第二半新部分 第二连接，所述第二半桥部分具有至少一个第二晶体管，以及控制部分，被配置为将第一切换信号提供给所述第一半桥部分的所述第一晶体管的栅极，作为所述第一半桥部分的电压的函数 第一连接。

公开(公告)号：US07372238B1

公开(公告)日：2008-05-13

申请号：US11458964

申请日：2006-07-20

Applicant: Kenji Tomiyoshi

Inventor： Kenji Tomiyoshi

IPC: G05F1/613 ,  G05F3/16

CPC classification number: H02M3/1588 ,  H02M2001/0009 ,  Y02B70/1466

Abstract: A current mode PWM buck regulator is provided. The regulator includes a top-side transistor, a bottom-side transistor, an inductor, a sample-and-hold circuit, a ramp generator, a PWM comparator, an error amplifier, and a current sense amplifier. A current through the low-side transistor is sensed by the current sense amplifier. Also, a current sense voltage provided by the current sense amplifier is sampled when the low-side transistor is on, and held when the low-side transistor is off. The ramp generator is arranged to generate a voltage ramp that emulates the upslope of the inductor current. Additionally, the sampled low-side transistor current is combined with the voltage ramp. The PWM comparator is arranged to provide a PWM signal by comparing the voltage ramp to a comparison signal provided by the error amplifier.

Abstract translation: 提供电流模式PWM降压稳压器。 调节器包括顶侧晶体管，底侧晶体管，电感器，采样保持电路，斜坡发生器，PWM比较器，误差放大器和电流检测放大器。 通过电流读出放大器感测通过低端晶体管的电流。 此外，当低侧晶体管导通时，由电流检测放大器提供的电流检测电压被采样，并且当低侧晶体管截止时保持。 斜坡发生器布置成产生模拟电感器电流的上坡的电压斜坡。 此外，采样的低侧晶体管电流与电压斜坡组合。 PWM比较器被布置成通过将电压斜坡与由误差放大器提供的比较信号进行比较来提供PWM信号。