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    • 3. 发明申请
    • Frequency synchronization device for LCD lamps
    • 液晶灯频率同步装置
    • US20060071617A1
    • 2006-04-06
    • US11226938
    • 2005-09-14
    • Shih-Chung HuangChien-Cheng YangTim Yu
    • Shih-Chung HuangChien-Cheng YangTim Yu
    • H05B37/00H05B39/00H05B41/00
    • H05B41/2822H05B41/2824H05B41/3927
    • A frequency synchronization device for a large LCD having a plurality of lamps as a background light source is disclosed. The device comprises a power amplification unit wherein one power amplification unit is electrically coupled to another amplification unit, each power amplification unit being electrically coupled to one or more of the lamps, adapted to generate a driving signal, and adapted to send the driving signal to the coupled lamp(s) for causing the lamps to operate at the same frequency; a plurality of current sampling elements each electrically coupled to one or more of the lamps for sampling current thereof; and control means comprising a control element and a diode, the control means being electrically coupled to current sampling elements so as to stabilize the current of the lamps. The connection and circuitry of the device are much simplified and improved.
    • 公开了一种具有多个灯作为背景光源的大型LCD的频率同步装置。 该装置包括功率放大单元,其中一个功率放大单元电耦合到另一个放大单元,每个功率放大单元电耦合到一个或多个灯,适于产生驱动信号,并适于将驱动信号发送到 用于使灯以相同频率操作的耦合灯; 多个电流采样元件,每个电流采样元件电耦合到一个或多个灯,用于对其电流进行采样; 以及包括控制元件和二极管的控制装置,所述控制装置电耦合到电流采样元件,以稳定灯的电流。 设备的连接和电路被大大简化和改进。
    • 5. 发明申请
    • Boost Regulator with Integrated Load Switch
    • 带集成负载开关的升压型稳压器
    • US20070236191A1
    • 2007-10-11
    • US11279375
    • 2006-04-11
    • Tim YuLu Chen
    • Tim YuLu Chen
    • G05F1/00
    • H02M3/1588Y02B70/1466
    • A boost regulator includes a diode D connected between a node VX and an output node VOUT. The node VX is connected to ground by a first switch M1. A second switch M2 and an inductor L are connected in series between the node VX and an input node VIN. The regulator has an enabled state and a disabled state. In the enabled stage, a control circuit turns the second switch on and drives the first switch using a PFM, PWM or other strategy. In the disabled state, control circuit turns the second switch off to prevent current passing through the regulator to the load.
    • 升压调节器包括连接在节点V X X和输出节点V OUT之间的二极管D。 节点V X X通过第一开关M 1连接到地。第二开关M 2和电感器L串联连接在节点V X和输入端 节点V 。 调节器具有使能状态和禁用状态。 在使能阶段,控制电路使第二个开关接通,并使用PFM,PWM或其他策略驱动第一个开关。 在禁用状态下,控制电路关闭第二个开关,以防止电流通过调节器流向负载。
    • 6. 发明申请
    • Method for Operational Amplifier Output Clamping for Switching Regulators
    • 开关稳压器运算放大器输出钳位方法
    • US20060279268A1
    • 2006-12-14
    • US11160161
    • 2005-06-10
    • Tim Yu
    • Tim Yu
    • G05F1/00
    • H02M3/156
    • A switching regulator includes a feedback network that generates a voltage Vea that is proportional to the difference between the output of the switching regulator and a reference voltage. A comparator is used to compare Vea to a sawtooth voltage to generate a voltage Vpwm. The voltage Vpwm drives a high-side switching transistor that controls the output of the regulator. A first clamping transistor that provides a variable gain connection between the voltage Vea and ground. As Vea rises above a predefined level, the clamping circuit increases the connection between Vea and ground, preventing Vea from substantially exceeding Vt. As a result, transient performance of the regulator is improved.
    • 开关调节器包括产生与开关调节器的输出与参考电压之间的差成比例的电压V eA的反馈网络。 比较器用于将V bias与锯齿波电压进行比较以产生电压V pwm。 电压V pwm 驱动控制调节器的输出的高侧开关晶体管。 第一钳位晶体管,其在电压V EA和地之间提供可变增益连接。 当V 上升到高于预定水平时,钳位电路增加了V sub和接地之间的连接,从而防止V bias大体上超过V < SUB> t 。 结果是改善了稳压器的瞬态性能。
    • 7. 发明申请
    • Method for improving the power supply rejection ratio (PSRR) of low power reference circuits
    • 提高低功率参考电路的电源抑制比(PSRR)的方法
    • US20060152206A1
    • 2006-07-13
    • US11021855
    • 2004-12-23
    • Tim Yu
    • Tim Yu
    • G05F3/16G05F3/20
    • G05F3/30
    • A bandgap reference circuit includes two diode-connected transistors and an operational amplifier. The operational amplifier is connected in a feedback arrangement so that the current passing through transistor is substantially the same. This means that the current density in each transistor differs. The output of the operational amplifier is a function of the base emitter voltages of the two transistors and is substantially temperature invariant. Each transistor has a supplemental capacitor connected between its collector and emitter. The capacitors are substantially equal in size and both are substantially larger than the parasitic capacitance of either transistor. As a result, the overall capacitance of each transistor is substantially the same giving the reference circuit a favorable power supply rejection ratio.
    • 带隙参考电路包括两个二极管连接的晶体管和运算放大器。 运算放大器以反馈装置连接,使得通过晶体管的电流基本相同。 这意味着每个晶体管中的电流密度不同。 运算放大器的输出是两个晶体管的基极发射极电压的函数,并且基本上是温度不变的。 每个晶体管具有连接在其集电极和发射极之间的补充电容器。 电容器的尺寸基本相等,并且两者都大大地大于任一晶体管的寄生电容。 结果,每个晶体管的总电容基本相同,使得参考电路具有有利的电源抑制比。