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    • 4. 发明申请
    • LED DRIVING CIRCUIT, SEMICONDUCTOR ELEMENT AND IMAGE DISPLAY DEVICE
    • LED驱动电路,半导体元件和图像显示器件
    • US20100177127A1
    • 2010-07-15
    • US12683697
    • 2010-01-07
    • Noboru AKIYAMATakayuki HASHIMOTOTakashi HIRAONobuyoshi MATSUURA
    • Noboru AKIYAMATakayuki HASHIMOTOTakashi HIRAONobuyoshi MATSUURA
    • G06F3/038G09G5/10
    • G09G3/36
    • An LED driving circuit driving an LED array includes: n constant-current driving elements having a vertical structure, each of which is connected to each of LED strings in series and drives the LED string with a constant current; n constant-current control circuits controlling on voltages of the constant-current driving elements so that currents flowing to the LED strings become constant currents; a lowest-voltage detecting circuit to which terminal voltages of the constant-current driving elements on an LED string side are inputted, the lowest-voltage detecting circuit selecting a lowest voltage from among the terminal voltages and outputting a command signal based on difference between the lowest voltage and a predetermined set voltage; and a power-supply control circuit controlling a voltage applied to the LED array to a voltage lower than an initial set voltage based on the command signal.
    • 驱动LED阵列的LED驱动电路包括:具有垂直结构的n个恒定电流驱动元件,其各自串联连接到每个LED串,并以恒定电流驱动LED串; n个恒流控制电路,控制恒流驱动元件的电压,使流到LED串的电流成为恒定电流; 输入LED串侧的恒流驱动元件的端子电压的最低电压检测电路,所述最低电压检测电路从所述端子电压中选择最低电压,并基于所述第二电压检测电路 最低电压和预定的设定电压; 以及电源控制电路,其基于所述命令信号,将施加到所述LED阵列的电压控制为低于初始设定电压的电压。
    • 5. 发明申请
    • SEMICONDUCTOR DEVICE AND POWER SUPPLY USING THE SAME
    • 半导体器件和使用该器件的电源
    • US20090243575A1
    • 2009-10-01
    • US12388819
    • 2009-02-19
    • Noboru AKIYAMATakayuki HashimotoTakashi HiraoKoji TatenoTakuya Ishigaki
    • Noboru AKIYAMATakayuki HashimotoTakashi HiraoKoji TatenoTakuya Ishigaki
    • G05F1/00
    • H02M3/156H02M2001/0025
    • A semiconductor device for control applied to a constant-voltage power supply device includes a digital-analog converter circuit which outputs a reference voltage corresponding to a value of a first register with taking an output voltage of a reference voltage source as a criterial reference voltage, and generates a control signal for driving a power semiconductor device based on an output voltage of an error amplifier which differentially amplifies a feedback voltage obtained by resistive-dividing on an output voltage of the constant-voltage power supply device and the reference voltage. An analog-digital converter circuit which converts the feedback voltage to a digital value with taking the output voltage of the constant-voltage power supply device as a reference voltage is provided, and based on the output, a value of a first register is corrected so as to offset an effect of an error in voltage dividing ratio of a voltage dividing resistor circuit.
    • 一种应用于恒压电源装置的控制用半导体装置,具备数模转换电路,该数模转换电路以取参考电压源的输出电压作为标准参考电压,输出与第一寄存器的值相对应的基准电压, 并且基于误差放大器的输出电压产生用于驱动功率半导体器件的控制信号,所述误差放大器的差分放大通过对所述恒压电源装置的输出电压进行电阻分压而获得的反馈电压和所述参考电压。 提供了一种模拟数字转换器电路,其将采取恒压电源装置的输出电压的反馈电压转换为数字值作为参考电压,并且基于该输出,第一寄存器的值被校正为 以抵消分压电阻电路的分压比的误差的影响。