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公开(公告)号：US09195249B2
公开(公告)日：2015-11-24
申请号：US13332142
申请日：2011-12-20
申请人： Sean S. Chen , Liwei Liu , Yongliang Wang
发明人： Sean S. Chen , Liwei Liu , Yongliang Wang
CPC分类号： G05F1/575
摘要： An adaptive phase-lead compensation (zero) circuit is disclosed that can be added to a circuit (e.g., a CMOS-based LDO) to ease the compensation and increase the phase margin of the circuit. By using the disclosed adaptive phase-lead compensation circuit, an adjustable resistance can be connected to any nodes in the compensated circuit rather than just to the voltage source (VDD) or ground (GND), allowing the Miller Effect to be used via a Miller capacitor.
摘要翻译： 公开了可以添加到电路（例如，基于CMOS的LDO）的自适应相位超前补偿（零）电路，以便于补偿并增加电路的相位裕度。 通过使用所公开的自适应相位 - 引线补偿电路，可调电阻可以连接到补偿电路中的任何节点，而不仅仅是连接到电压源（VDD）或接地（GND），允许米勒效应通过米勒 电容器。
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公开(公告)号：US20130154593A1
公开(公告)日：2013-06-20
申请号：US13332142
申请日：2011-12-20
申请人： Sean S. Chen , Liwei Liu , Yongliang Wang
发明人： Sean S. Chen , Liwei Liu , Yongliang Wang
CPC分类号： G05F1/575
摘要： An adaptive phase-lead compensation (zero) circuit is disclosed that can be added to a circuit (e.g., a CMOS-based LDO) to ease the compensation and increase the phase margin of the circuit. By using the disclosed adaptive phase-lead compensation circuit, an adjustable resistance can be connected to any nodes in the compensated circuit rather than just to the voltage source (VDD) or ground (GND), allowing the Miller Effect to be used via a Miller capacitor.
摘要翻译： 公开了可以添加到电路（例如，基于CMOS的LDO）的自适应相位超前补偿（零）电路，以便于补偿并增加电路的相位裕度。 通过使用所公开的自适应相位 - 引线补偿电路，可调电阻可以连接到补偿电路中的任何节点，而不仅仅是连接到电压源（VDD）或接地（GND），允许米勒效应通过米勒 电容器。
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公开(公告)号：US09013110B2
公开(公告)日：2015-04-21
申请号：US13308190
申请日：2011-11-30
CPC分类号： H05B33/0815
摘要： In one novel aspect, driving a string of light emitting elements, such as LEDs, includes applying a drive signal to circuitry that regulates a voltage appearing at a source of a transistor whose drain is coupled to one end of the string of light emitting elements and whose source is coupled to ground through a resistive element. Sequencing of the drive signal and a voltage supply signal for the light emitting elements is controlled such that the voltage supply signal is not increased above a predetermined allowable voltage for the transistor until the transistor is turned on, and such that the supply voltage is not decreased below the allowable voltage for the transistor until the transistor is turned off.
摘要翻译： 在一个新颖的方面，驱动一串发光元件（例如LED）包括将驱动信号施加到电路，该电路调节出现在其漏极耦合到发光元件串的一端的晶体管的源极处的电压，以及 其源极通过电阻元件耦合到地。 控制驱动信号的排序和发光元件的电压供给信号，使得电压供给信号在晶体管导通之前没有增加到晶体管的预定容许电压以上，并且电源电压不降低 低于晶体管的允许电压，直到晶体管关断。
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公开(公告)号：US08952623B2
公开(公告)日：2015-02-10
申请号：US13281366
申请日：2011-10-25
IPC分类号： H05B41/16
CPC分类号： G09G3/342 , G09G2320/0233 , G09G2320/064
摘要： The disclosed multi-channel driver equalizer circuit matches currents in multiple strings of illumination devices at low current levels by using an analog equalizer to sequentially couple the output of a reference amplifier in series with each current source amplifier in a current limit loop of the driver equalizer circuit to correct the offsets of the current source amplifiers, resulting in the matching of string currents on average.
摘要翻译： 所公开的多通道驱动均衡器电路通过使用模拟均衡器在多个照明装置串中的电流匹配电流，所述模拟均衡器在驱动器均衡器的限流回路中将参考放大器的输出与每个电流源放大器串联耦合 电路来校正电流源放大器的偏移，导致串电流的匹配平均。
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公开(公告)号：US06788143B1
公开(公告)日：2004-09-07
申请号：US10136196
申请日：2002-04-29
申请人： Sean S. Chen
发明人： Sean S. Chen
IPC分类号： H03F345
CPC分类号： H03F3/45179 , H03F3/45192 , H03F2203/45028 , H03F2203/45304 , H03F2203/45612 , H03F2203/45632 , H03F2203/45664 , H03F2203/45676
摘要： A cascode stage is arranged to improve performance of an operational amplifier. The cascode stage includes transistors that are arranged to operate as a current mirror. Each side of the current mirror has a corresponding voltage at a corresponding node. One of the corresponding nodes corresponds to a high impedance node that is coupled to a subsequent stage of the amplifier. The voltages at the corresponding nodes are closely matched to one another such that the input referred offset in the amplifier is minimized and the power supply rejection ratio is improved (PSRR). A transistor threshold voltage and a transistor saturation voltage determine the headroom requirements of the cascode stage, such that low power supply voltage operation is possible. The biasing of the transistors in the cascode stage is simplified such that minimal biasing circuitry is required, and overall power consumption may be minimized.
摘要翻译： 布置级联级以改善运算放大器的性能。 共射共栅级包括被设置为作为电流镜操作的晶体管。 电流镜的每侧在相应的节点处具有相应的电压。 相应节点中的一个对应于耦合到放大器的后续级的高阻抗节点。 相应节点处的电压彼此紧密匹配，使得放大器中的输入参考偏移被最小化并且提供了电源抑制比（PSRR）。 晶体管阈值电压和晶体管饱和电压决定了共源共栅级的余量要求，使得低电源电压工作成为可能。 在共源共栅级中的晶体管的偏置被简化，使得需要最小的偏置电路，并且总的功耗可以被最小化。
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公开(公告)号：US20130099697A1
公开(公告)日：2013-04-25
申请号：US13281366
申请日：2011-10-25
IPC分类号： H05B37/02
CPC分类号： G09G3/342 , G09G2320/0233 , G09G2320/064
摘要： The disclosed multi-channel driver equalizer circuit matches currents in multiple strings of illumination devices at low current levels by using an analog equalizer to sequentially couple the output of a reference amplifier in series with each current source amplifier in a current limit loop of the driver equalizer circuit to correct the offsets of the current source amplifiers, resulting in the matching of string currents on average.
摘要翻译： 所公开的多通道驱动均衡器电路通过使用模拟均衡器在多个照明装置串中的电流匹配电流，所述模拟均衡器在驱动器均衡器的限流回路中将参考放大器的输出与每个电流源放大器串联耦合 电路来校正电流源放大器的偏移，导致串电流的匹配平均。
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公开(公告)号：US06914494B1
公开(公告)日：2005-07-05
申请号：US10649085
申请日：2003-08-26
申请人： Sean S. Chen
发明人： Sean S. Chen
IPC分类号： H03K3/012 , H03K3/0231 , H03L7/00
CPC分类号： H03K3/0231 , H03K3/012
摘要： A low current oscillator circuit comprising a comparator for driving an output signal. A first capacitor chain is coupled to the comparator. The first capacitor chain is configured for setting a first input voltage of the comparator. A second capacitor chain is also coupled to the comparator. The second capacitor chain is configured for setting a second input voltage of the comparator, wherein the first capacitor chain and the second capacitor chain determine a first voltage level and a second voltage level of oscillation of the comparator. The first capacitor chain and the second capacitor chain are free of DC current flow.
摘要翻译： 一种低电流振荡器电路，包括用于驱动输出信号的比较器。 第一电容器链耦合到比较器。 第一电容器链被配置用于设置比较器的第一输入电压。 第二电容器链还耦合到比较器。 第二电容器链被配置为设置比较器的第二输入电压，其中第一电容器链和第二电容器链确定比较器的第一电压电平和第二电压振荡电平。 第一个电容器链和第二个电容器链没有直流电流。
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公开(公告)号：US09288852B2
公开(公告)日：2016-03-15
申请号：US13413820
申请日：2012-03-07
申请人： Sean S. Chen , Wenbo Liang
发明人： Sean S. Chen , Wenbo Liang
CPC分类号： H05B33/0812 , H05B33/0827 , Y02B20/343 , Y02B20/345
摘要： A circuit for driving light emitting elements, such as LEDs, includes a first transistor having a source coupled to ground through a first resistive element, and a second transistor having a gate electrically coupled to a gate of the first transistor, a source electrically coupled to ground, and a drain for electrical connection to a first group of light emitting elements. The circuit also includes circuitry to provide a predetermined voltage at the source of the first transistor, circuitry to compensate for a difference in respective gate-source voltages of the first and second transistors, and circuitry to compensate for a difference in respective drain-source voltages of the first and second transistors. In some implementations, the circuit can achieve relatively low power consumption.
摘要翻译： 用于驱动诸如LED的发光元件的电路包括具有通过第一电阻元件耦合到地的源极的第一晶体管和具有电耦合到第一晶体管的栅极的栅极的第二晶体管，源极电耦合到 接地和用于电连接到第一组发光元件的漏极。 电路还包括在第一晶体管的源极处提供预定电压的电路，用于补偿第一和第二晶体管的各个栅极 - 源极电压的差异的电路，以及用于补偿各个漏极 - 源极电压 的第一和第二晶体管。 在一些实现中，电路可以实现相对低的功耗。
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公开(公告)号：US20140153291A1
公开(公告)日：2014-06-05
申请号：US13691088
申请日：2012-11-30
申请人： Hong Zhang , Sean S. Chen , Dilip Sangam
发明人： Hong Zhang , Sean S. Chen , Dilip Sangam
CPC分类号： H02M3/33507 , H02M1/4258 , H05B33/0809 , Y02B70/126
摘要： A dual-mode circuit for the control of an AC/DC power converter is disclosed. An example dual-mode controller circuit generates a waveform that drives a switch on or off and controls the power converter. The controller circuit in addition to power factor correction (PFC) circuitry includes a critical conducting mode (CrM) module as well as a discontinuous conducting mode (DCM) module configured to generate waveforms adapted for CrM and DCM operation of a power converter. The circuit includes a node for receiving a feedback signal of a voltage or a current. Based on the received signal, one of the modules is selected at a time to supply the waveform at the output of the dual-mode controller. An example of the output waveform is a series of pulses that are configured to drive the switch that controls the transfer of power between input and output of the power converter.
摘要翻译： 公开了一种用于控制AC / DC电力转换器的双模电路。 示例双模控制器电路产生一个驱动开关打开或关闭并控制电源转换器的波形。 功率因数校正（PFC）电路除了功率因数校正（PFC）电路之外，控制器电路包括临界导电模式（CrM）模块以及被配置为产生适于功率转换器的CrM和DCM操作的波形的不连续导通模式（DCM）模块。 电路包括用于接收电压或电流的反馈信号的节点。 基于接收信号，一次选择一个模块以在双模式控制器的输出处提供波形。 输出波形的示例是被配置为驱动开关的一系列脉冲，其控制功率转换器的输入和输出之间的功率传递。
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公开(公告)号：US20130093339A1
公开(公告)日：2013-04-18
申请号：US13413820
申请日：2012-03-07
申请人： Sean S. Chen , Wenbo Liang
发明人： Sean S. Chen , Wenbo Liang
IPC分类号： H05B37/02
CPC分类号： H05B33/0812 , H05B33/0827 , Y02B20/343 , Y02B20/345
摘要： A circuit for driving light emitting elements, such as LEDs, includes .a first transistor having a source coupled to ground through a first resistive element, and a second transistor having a gate electrically coupled to a gate of the first transistor, a source electrically coupled to ground, and a drain for electrical connection to a first group of light emitting elements. The circuit also includes circuitry to provide a predetermined voltage at the source of the first transistor, circuitry to compensate for a difference in respective gate-source voltages of the first and second transistors, and circuitry to compensate for a difference in respective drain-source voltages of the first and second. transistors. In some implementations, the circuit can achieve relatively low power consumption.
摘要翻译： 用于驱动诸如LED的发光元件的电路包括：具有通过第一电阻元件耦合到地的源极的第一晶体管和具有电耦合到第一晶体管的栅极的栅极的第二晶体管，源电耦合 以及用于电连接到第一组发光元件的漏极。 电路还包括在第一晶体管的源极处提供预定电压的电路，用于补偿第一和第二晶体管的各个栅极 - 源极电压的差异的电路，以及用于补偿各个漏 - 源电压 的第一和第二。 晶体管。 在一些实现中，电路可以实现相对低的功耗。
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