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    • 2. 发明申请
    • METHOD AND CIRCUITS FOR SHORT-CIRCUIT PROTECTION OF LED SYSTEMS
    • LED系统短路保护的方法和电路
    • US20110316543A1
    • 2011-12-29
    • US13005402
    • 2011-01-12
    • Zhengdong ZhangJianbo SunLi ZhangYun LuXuguang Zhang
    • Zhengdong ZhangJianbo SunLi ZhangYun LuXuguang Zhang
    • G01R31/00
    • H05B33/0893Y02B20/341
    • An embodiment of the present invention relates to a method for detection of short circuit conditions in an LED array having one or more LED strings, each of which includes one or more LED devices. The method includes determining a minimum voltage that is the lowest of voltages associated with cathode terminals of the one or more LED strings. The method also includes determining if said minimum voltage is between a lower limit voltage and an upper voltage limit. If said minimum voltage is between the lower limit voltage and the upper voltage limit, then a result of a short circuit testing can be considered valid. Here, the short circuit testing includes comparing a sampled voltage associated with a cathode voltage of one of the LED strings with a short-circuit reference voltage.
    • 本发明的实施例涉及一种用于检测具有一个或多个LED串的LED阵列中的短路状况的方法,每个LED串包括一个或多个LED器件。 该方法包括确定与一个或多个LED串的阴极端子相关联的最低电压的最小电压。 该方法还包括确定所述最小电压是否在下限电压和上限电压之间。 如果所述最小电压在下限电压和上限电压之间,则短路测试的结果可以被认为是有效的。 这里,短路测试包括将与一个LED串的阴极电压相关联的采样电压与短路参考电压进行比较。
    • 3. 发明申请
    • Drive Circuit For Parallel Array of Light Emitting Diodes
    • 用于并联发光二极管阵列的驱动电路
    • US20110215727A1
    • 2011-09-08
    • US12777079
    • 2010-05-10
    • Zutao LiuKun ChengJianbo SunGang Shi
    • Zutao LiuKun ChengJianbo SunGang Shi
    • H05B37/02
    • H05B33/0845H05B33/0818H05B33/0827
    • The present invention relates to a parallel light emitting diode (“LED”) drive circuit and provides a drive circuit configured to drive a parallel array of LEDs. The drive circuit comprises: a plurality of switches, a plurality of sampling resistors, and a plurality of chopper amplifiers. Each switch is coupled to a respective LED in the LED array. Each chopper operational amplifier configured to receive a reference voltage and a switching control signal and generate an input offset voltage. Each chopper operational amplifier includes a differential amplifier including an input transistor pair and a current mirror transistor pair, of which the electrical positions can be reserved when the switching control signal is switched between a first state and a second state, wherein the offset voltage, which causes the lightness mismatching in a parallel LED circuit, can be cancelled.
    • 本发明涉及一种并行发光二极管(“LED”)驱动电路,并提供配置成驱动LED平行排列的驱动电路。 驱动电路包括:多个开关,多个采样电阻器和多个斩波放大器。 每个开关耦合到LED阵列中的相应LED。 每个斩波运算放大器被配置为接收参考电压和开关控制信号并产生输入失调电压。 每个斩波运算放大器包括差分放大器,该差分放大器包括输入晶体管对和电流镜晶体管对,当开关控制信号在第一状态和第二状态之间切换时,电位置可被保留,其中偏移电压 导致并联LED电路的亮度不匹配,可以取消。
    • 4. 发明申请
    • Dynamically Controllable Drive Circuit For Parallel Array Of Light Emitting Diodes
    • 用于发光二极管并联阵列的动态可控驱动电路
    • US20110215726A1
    • 2011-09-08
    • US12777073
    • 2010-05-10
    • Zutao LiuKun ChengJianbo SunGang Shi
    • Zutao LiuKun ChengJianbo SunGang Shi
    • H05B37/02
    • H05B33/0845H05B33/0818H05B33/0827
    • The present invention relates to a parallel light emitting diode (“LED”) drive circuit and provides a drive circuit configured to drive a parallel array of LEDs. The drive circuit comprises: a switching control signal generator, a plurality of switches, a plurality of sampling resistors, and a plurality of chopper amplifiers. Each switch is coupled to a respective LED in the LED array. Each chopper operational amplifier configured to receive a reference voltage and a switching control signal generated by the switching control signal generator and generate an input offset voltage. Each chopper operational amplifier includes a differential amplifier including an input transistor pair and a current mirror transistor pair, of which the electrical positions can be reserved when the switching control signal is switched between a first state and a second state, wherein the offset voltage, which causes the lightness mismatching in a parallel LED circuit, can be cancelled.
    • 本发明涉及一种并行发光二极管(“LED”)驱动电路,并提供配置成驱动LED平行排列的驱动电路。 驱动电路包括:开关控制信号发生器,多个开关,多个采样电阻器和多个斩波放大器。 每个开关耦合到LED阵列中的相应LED。 每个斩波运算放大器被配置为接收由开关控制信号发生器产生的参考电压和开关控制信号,并产生输入偏移电压。 每个斩波运算放大器包括差分放大器,该差分放大器包括输入晶体管对和电流镜晶体管对,当开关控制信号在第一状态和第二状态之间切换时,电位置可被保留,其中偏移电压 导致并联LED电路的亮度不匹配,可以取消。
    • 7. 发明授权
    • Drive circuit for parallel array of light emitting diodes
    • 用于并联发光二极管阵列的驱动电路
    • US08552660B2
    • 2013-10-08
    • US12777079
    • 2010-05-10
    • Zutao LiuKun ChengJianbo SunGang Shi
    • Zutao LiuKun ChengJianbo SunGang Shi
    • H05B37/02
    • H05B33/0845H05B33/0818H05B33/0827
    • The present invention relates to a parallel light emitting diode (“LED”) drive circuit and provides a drive circuit configured to drive a parallel array of LEDs. The drive circuit comprises: a plurality of switches, a plurality of sampling resistors, and a plurality of chopper amplifiers. Each switch is coupled to a respective LED in the LED array. Each chopper operational amplifier configured to receive a reference voltage and a switching control signal and generate an input offset voltage. Each chopper operational amplifier includes a differential amplifier including an input transistor pair and a current mirror transistor pair, of which the electrical positions can be reserved when the switching control signal is switched between a first state and a second state, wherein the offset voltage, which causes the lightness mismatching in a parallel LED circuit, can be cancelled.
    • 本发明涉及一种并行发光二极管(“LED”)驱动电路,并提供配置成驱动LED平行排列的驱动电路。 驱动电路包括:多个开关,多个采样电阻器和多个斩波放大器。 每个开关耦合到LED阵列中的相应LED。 每个斩波运算放大器被配置为接收参考电压和开关控制信号并产生输入失调电压。 每个斩波运算放大器包括差分放大器,该差分放大器包括输入晶体管对和电流镜晶体管对,当开关控制信号在第一状态和第二状态之间切换时,电位置可被保留,其中偏移电压 导致并联LED电路的亮度不匹配,可以取消。
    • 8. 发明申请
    • DYNAMICALLY CONTROLLABLE DRIVE CIRCUIT FOR PARALLEL ARRAY OF LIGHT EMITTING DIODES
    • 用于发光二极管并联阵列的动态可控驱动电路
    • US20130127360A1
    • 2013-05-23
    • US13736530
    • 2013-01-08
    • Zutao LiuKun ChengJianbo SunGang Shi
    • Zutao LiuKun ChengJianbo SunGang Shi
    • H05B33/08
    • H05B33/0845H05B33/0818H05B33/0827
    • The present invention relates to a parallel light emitting diode (“LED”) drive circuit and provides a drive circuit configured to drive a parallel array of LEDs. The drive circuit comprises: a switching control signal generator, a plurality of switches, a plurality of sampling resistors, and a plurality of chopper amplifiers. Each switch is coupled to a respective LED in the LED array. Each chopper operational amplifier configured to receive a reference voltage and a switching control signal generated by the switching control signal generator and generate an input offset voltage. Each chopper operational amplifier includes a differential amplifier including an input transistor pair and a current mirror transistor pair, of which the electrical positions can be reserved when the switching control signal is switched between a first state and a second state, wherein the offset voltage, which causes the lightness mismatching in a parallel LED circuit, can be cancelled.
    • 本发明涉及一种并行发光二极管(“LED”)驱动电路,并提供配置成驱动LED平行排列的驱动电路。 驱动电路包括:开关控制信号发生器,多个开关,多个采样电阻器和多个斩波放大器。 每个开关耦合到LED阵列中的相应LED。 每个斩波运算放大器被配置为接收由开关控制信号发生器产生的参考电压和开关控制信号,并产生输入偏移电压。 每个斩波运算放大器包括差分放大器,该差分放大器包括输入晶体管对和电流镜晶体管对,当开关控制信号在第一状态和第二状态之间切换时,电位置可被保留,其中偏移电压 导致并联LED电路的亮度不匹配,可以取消。
    • 10. 发明申请
    • CIRCUIT AND METHOD FOR CONTROLLING LIGHT EMITTING DIODE
    • 用于控制发光二极管的电路和方法
    • US20140001968A1
    • 2014-01-02
    • US13596332
    • 2012-08-28
    • Jianbo SUN
    • Jianbo SUN
    • H05B37/02
    • H05B33/0845
    • A method for controlling a current flowing through one or more light emitting diodes (LEDs) comprising receiving a Pulse Width Modulation (PWM) control signal, which includes rising and falling edges; receiving a first voltage signal; generating a second voltage signal based on the PWM control signal and the first voltage signal, wherein the second voltage increases gradually in response to one of the rising and falling edges of the PWM signal and decreases gradually in response to the other of the rising and falling edges of the PWM signal; and providing a current to the one or more LEDs, wherein the current varies gradually according to the second voltage.
    • 一种用于控制流过一个或多个发光二极管(LED)的电流的方法,包括接收包括上升沿和下降沿的脉宽调制(PWM)控制信号; 接收第一电压信号; 基于PWM控制信号和第一电压信号产生第二电压信号,其中第二电压响应于PWM信号的上升沿和下降沿之一逐渐增加,并且响应于另一个上升和下降而逐渐减小 PWM信号的边沿; 以及向所述一个或多个LED提供电流,其中所述电流根据所述第二电压逐渐变化。