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1. 发明授权

US09706610B2 Driving circuits for light emitting elements 有权
公开(公告)号：US09706610B2
公开(公告)日：2017-07-11
申请号：US13275954
申请日：2011-10-18
申请人： Sean S. Chen , Wenbo Liang
发明人： Sean S. Chen , Wenbo Liang
IPC分类号： H05B33/08
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.

2. 发明授权

US09195249B2 Adaptive phase-lead compensation with Miller Effect 有权
标题翻译：采用米勒效应进行自适应相位补偿
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
IPC分类号： G05F1/56 , G05F1/575
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。

3. 发明授权

US07400187B1 Low voltage, low Z, band-gap reference 有权
标题翻译：低电压，低Z，带隙基准
公开(公告)号：US07400187B1
公开(公告)日：2008-07-15
申请号：US09970297
申请日：2001-10-02
申请人： Sean S. Chen
发明人： Sean S. Chen
IPC分类号： G05F1/10
CPC分类号： G05F3/30
摘要： The present invention relates to a low impedance band-gap voltage reference circuit which comprises a band-gap reference circuit, a buffer circuit to reduce the impedance and related noise associated with band-gap references electronically coupled with the band-gap voltage reference circuit and a voltage pull-up device electronically coupled with both the band-gap reference circuit and the buffer circuit. The voltage pull-up device acts to reduce the supply voltage required to maintain a stable, low Z band-gap reference voltage.
摘要翻译：低阻抗带隙电压参考电路本发明涉及一种低阻抗带隙电压参考电路，其包括带隙基准电路，缓冲电路，以减少与带隙电压参考电路电耦合的带隙基准相关联的阻抗和相关噪声;以及与带隙基准电路和缓冲电路两者电连接的电压上拉装置。电压上拉器件用于降低维持稳定的低Z带隙参考电压所需的电源电压。

4. 发明授权

US06621333B1 Circuit and method to counter offset voltage induced by load changes 有权
标题翻译：对负载变化引起的偏移电压进行补偿的电路和方法
公开(公告)号：US06621333B1
公开(公告)日：2003-09-16
申请号：US10014728
申请日：2001-12-11
申请人： Sean S. Chen
发明人： Sean S. Chen
IPC分类号： H03F102
CPC分类号： H03F1/308 , H03F3/3008
摘要： A circuit for countering offset voltage in an amplifier induced by changes in the output load. The circuit comprises an input stage, an output stage, and first and second current compensation stages. The first current compensation stage is coupled to the output stage and produces a first compensation current that is a function of the output current. The input stage is coupled to the first current compensation stage from which it receives the first compensation current. The input stage is configured to cause a change in the voltage between its input terminals in response to the first compensation current. The second current compensation stage produces a second compensation current, which is also fed into the input stage to act jointly with the first compensation current. The first compensation current may be linearly related to the output current. The second compensation current may be exponentially related to the output current.
摘要翻译：用于对抗由输出负载变化引起的放大器中的失调电压的电路。该电路包括输入级，输出级以及第一和第二电流补偿级。第一电流补偿级耦合到输出级并产生作为输出电流的函数的第一补偿电流。输入级耦合到第一电流补偿级，从其接收第一补偿电流。输入级被配置为响应于第一补偿电流而使其输入端子之间的电压发生变化。第二电流补偿级产生第二补偿电流，其也馈送到输入级以与第一补偿电流共同作用。第一补偿电流可以与输出电流线性相关。第二个补偿电流可能与输出电流呈指数关系。

5. 发明授权

US06433516B1 Temperature stabilized constant current source suitable for charging charge depleted battery with single power supply 有权
标题翻译：温度稳定的恒流源适用于单电源充电耗尽电池
公开(公告)号：US06433516B1
公开(公告)日：2002-08-13
申请号：US09879474
申请日：2001-06-11
申请人： Sean S. Chen
发明人： Sean S. Chen
IPC分类号： H02J716
CPC分类号： H02J7/0091
摘要： A temperature stabilized, constant current source capable of charging a fully discharged battery of the present invention includes a feedback control stage that provides a substantially constant battery charging current at a particular temperature. A temperature stabilized current source stage coupled to a bias resistor includes a negative temperature coefficient current source that provides a countervailing control current to a positive temperature coefficient current source that is coupled from a sensing resistor. The temperature dependencies of the positive and negative temperature coefficient current sources tend to cancel each other out so as to provide a temperature stabilized current to the sensing resistor. The bias resistor provides a bias current to the temperature stabilized current source stage in such a way that the temperature stabilized current source stage provides a charging current to a fully discharged battery.
摘要翻译：能够对本发明的完全放电的电池充电的温度稳定的恒定电流源包括在特定温度下提供基本恒定的电池充电电流的反馈控制级。耦合到偏置电阻器的温度稳定的电流源级包括负温度系数电流源，其向从感测电阻器耦合的正温度系数电流源提供抵消控制电流。正温度系数和负温度系数电流源的温度依赖性倾向于彼此抵消，以便向感测电阻器提供温度稳定的电流。偏置电阻器以这样的方式向温度稳定的电流源级提供偏置电流，使得温度稳定的电流源级提供到完全放电的电池的充电电流。

6. 发明授权

US06404266B1 Differential input stage with bias current reduction for latch-up prevention 有权
标题翻译：具有偏置电流降低的差分输入级，用于防止闩锁
公开(公告)号：US06404266B1
公开(公告)日：2002-06-11
申请号：US09624738
申请日：2000-07-25
申请人： Sean S. Chen
发明人： Sean S. Chen
IPC分类号： H03K1760
CPC分类号： H03F3/45094 , H03F2203/45028 , H03F2203/45374 , H03F2203/45594
摘要： A differential input stage with full-rail sensing and reduced latch-up susceptibility includes an emitter-coupled pair, a current mirror, and several series resistors. For a NPN emitter-coupled pair, a series resistor is connected between the input node and the base of each transistor of the emitter-coupled pair, and a series resistor is connected between each load resistor and its corresponding current mirror transistor. The series resistors reduce current flowing into the PN junctions when power to the overall circuit is disabled but an input signal is present at the input terminals.
摘要翻译：具有全轨感测和闭锁灵敏度降低的差分输入级包括发射极耦合对，电流镜和几个串联电阻。对于NPN发射极耦合对，在输入节点和发射极耦合对的每个晶体管的基极之间连接有串联电阻器，并且串联电阻器连接在每个负载电阻器及其相应的电流镜像晶体管之间。当整个电路的电源被禁止但输入端子上存在输入信号时，串联电阻可以减少流入PN结的电流。

7. 发明授权

US09013110B2 Circuit for driving light emitting elements 有权
标题翻译：用于驱动发光元件的电路
公开(公告)号：US09013110B2
公开(公告)日：2015-04-21
申请号：US13308190
申请日：2011-11-30
申请人： Sean S. Chen , Jeff Kotowski , Timothy James Herklots
发明人： Sean S. Chen , Jeff Kotowski , Timothy James Herklots
IPC分类号： H05B37/00 , H05B33/08
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。

8. 发明授权

US08952623B2 Multi-channel driver equalizer 有权
标题翻译：多通道驱动均衡器
公开(公告)号：US08952623B2
公开(公告)日：2015-02-10
申请号：US13281366
申请日：2011-10-25
申请人： Sean S. Chen , Jeff Kotowski , Timothy James Herklots
发明人： Sean S. Chen , Jeff Kotowski , Timothy James Herklots
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。

9. 发明授权

US06788143B1 Cascode stage for an operational amplifier 有权
标题翻译：用于运算放大器的串级
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。

10. 发明申请

US20130099697A1 Multi-Channel Driver Equalizer 有权
标题翻译：多通道驱动均衡器
公开(公告)号：US20130099697A1
公开(公告)日：2013-04-25
申请号：US13281366
申请日：2011-10-25
申请人： Sean S. Chen , Jeff Kotowski , Timothy James Herklots
发明人： Sean S. Chen , Jeff Kotowski , Timothy James Herklots
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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