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    • 3. 发明专利
    • Bias controlling apparatus
    • 偏差控制装置
    • JP2010074407A
    • 2010-04-02
    • JP2008238329
    • 2008-09-17
    • Toshiba Corp株式会社東芝
    • MOCHIZUKI AKIRA
    • H03F1/52H03F1/30H03F3/24
    • H03F1/301H03F2200/18H03F2200/447H03F2200/468
    • PROBLEM TO BE SOLVED: To provide a bias controlling apparatus making bias adjustment of an FET without wrong setting to a bias by which the FET is damaged.
      SOLUTION: A gate bias circuit 1 generates a positive voltage signal for compensating temperature which is common between FETs 12 and 22 in a variable voltage reference 31, and generates a positive voltage signal for bias adjustment different for each of the FETs 12 and 22 by applying a positive voltage signal generated in a voltage reference 32 to each variable resistance 36 and 37 separately from the positive voltage signal for compensating temperature. By adding the positive voltage signal for compensating temperature and the positive voltage signal for bias adjustment at each of operational amplifiers 33 and 34 and inverting and amplifying the result, a bias voltage to each of the FET 12 and 22 is generated.
      COPYRIGHT: (C)2010,JPO&INPIT
    • 要解决的问题:提供一种偏压控制装置,其对FET的偏置调节而没有错误地设定到FET被损坏的偏压。 解决方案:栅极偏置电路1产生用于补偿可变参考电压31中的FET 12和22之间共同的温度的正电压信号,并且产生用于每个FET 12和12的偏置调整的正电压信号 通过将电压基准32中产生的正电压信号与用于补偿温度的正电压信号分开施加到每个可变电阻36和37上。 通过在各运算放大器33,34中添加用于补偿温度的正电压信号和用于偏置调整的正电压信号,并且反相和放大结果,产生对FET 12和22中的每一个的偏置电压。 版权所有(C)2010,JPO&INPIT
    • 7. 发明专利
    • Class d amplifier
    • D类放大器
    • JP2006033499A
    • 2006-02-02
    • JP2004210410
    • 2004-07-16
    • Sony Corpソニー株式会社
    • OGURI KAZUATSU
    • H03F3/217H03F99/00H03F1/52
    • H03F3/217H03F3/2173H03F2200/331H03F2200/468
    • PROBLEM TO BE SOLVED: To prevent excessive generation of heat of a switching element and break of the element by the excessive generation of heat, and to obtain good audio property. SOLUTION: A detection part which detects an operation state of the switching element, is comprised in a switching amplification part 20 which drives a pair of switching elements, and creates a switching signal which is carried out pulse amplification. A signal creation part 10 which creates a pulse width modulated signal for driving the switching elements, is provided with a dead time setting part 12 which establishes dead time by using propagation delay time of a logic device, and delaying the pulse width modulated signal, and a control part 14 which controls the dead time setting part 12 based on the detection result of the detection part, makes the dead time long when it becomes an operation state that loss of the switching elements increases, and the detection result reaches a threshold value established beforehand, and makes the dead time short when it becomes an operation state the loss decreases, and the detection result reaches an threshold value established beforehand. COPYRIGHT: (C)2006,JPO&NCIPI
    • 要解决的问题:为了防止开关元件的过度产生热量和过度产生热量而使元件断裂,并获得良好的音频特性。 解决方案:检测开关元件的工作状态的检测部件包括在驱动一对开关元件的开关放大部件20中,并产生进行脉冲放大的开关信号。 创建用于驱动开关元件的脉宽调制信号的信号产生部分10设置有死区时间设置部分12,其通过使用逻辑器件的传播延迟时间来建立死区时间,并延迟脉宽调制信号,以及 基于检测部的检测结果来控制死区时间设定部12的控制部14在成为开关元件的损耗增加的动作状态时使死区时间变长,检测结果达到设定的阈值 并且在成为运行状态时使死区时间短,并且检测结果达到事先设定的阈值。 版权所有(C)2006,JPO&NCIPI