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    • 6. 发明专利
    • Method and electronic device for driving capacitance electro-acoustic transducer
    • 用于驱动电容电声传感器的方法和电子装置
    • JP2010098712A
    • 2010-04-30
    • JP2009128052
    • 2009-05-27
    • Kotatsu Kokusai Denshi Kofun Yugenkoshi宏達國際電子股▲ふん▼有限公司
    • LEE FANG-CHING
    • H04R3/00H03F3/20H03G3/20H04R19/01H04R19/02
    • H03F3/181H03F2200/03H03F2200/45H04R3/06H04R19/013
    • PROBLEM TO BE SOLVED: To provide a method and an electronic device for driving a capacitance electro-acoustic transducer, and to save power by using physical characteristics of low power consumption of the capacitance electro-acoustic transducer. SOLUTION: The electronic device includes the capacitance electro-acoustic transducer and an audio driver. The audio driver is coupled to the capacitance electro-acoustic transducer. The audio driver includes a high-voltage amplifier for receiving an input audio signal and for transforming the input audio signal into an output audio signal to drive the capacitance electro-acoustic transducer, wherein an absolute voltage value of the input audio signal is smaller than an absolute voltage value of the output audio signal. The electro-acoustic transducer is an electret loudspeaker or electret earphone. The capacitance electro-acoustic transducer includes an electret diaphragm and a perforated electrode plate. COPYRIGHT: (C)2010,JPO&INPIT
    • 要解决的问题:提供用于驱动电容式电声换能器的方法和电子装置,并且通过使用电容式电声换能器的低功耗的物理特性来节省功率。 解决方案:电子设备包括电容式电声换能器和音频驱动器。 音频驱动器耦合到电容式电声换能器。 音频驱动器包括用于接收输入音频信号并将输入音频信号变换为输出音频信号以驱动电容式电声换能器的高压放大器,其中输入音频信号的绝对电压值小于 输出音频信号的绝对电压值。 电声换能器是驻极体扬声器或驻极体耳机。 电容式电声换能器包括驻极体隔膜和穿孔电极板。 版权所有(C)2010,JPO&INPIT
    • 10. 发明专利
    • Capacitive load driving circuit, electrostatic transducer, method of setting circuit constant, ultrasonic speaker, display device, and directional acoustic system
    • 电容式负载驱动电路,静电传感器,设置电路常数的方法,超声波扬声器,显示装置和方向声学系统
    • JP2007181176A
    • 2007-07-12
    • JP2006281683
    • 2006-10-16
    • Seiko Epson Corpセイコーエプソン株式会社
    • MIYAZAKI SHINICHI
    • H04R19/02H03F1/34H03F3/217H04R3/06
    • H04R19/02G03B21/14H03F1/34H03F3/2171H03F3/2173H03F2200/03H03F2200/345H03F2200/351H03F2200/45H03F2200/541H04R2217/03
    • PROBLEM TO BE SOLVED: To provide a capacitive load driving circuit that assures an even output voltage frequency characteristic in a driving frequency band and enables low loss driving, when a capacitive load is driven with a D-class power amplifier. SOLUTION: An LC low-pass filter 15 is provided on the output side of an output stage 14 of a D-class power amplifier, and an output of the LC low-pass filter is applied to a load electrostatic capacity CL through an output transformer T. In this case, a negative feedback circuit 16 feeds back a negative feedback signal from a latter stage of the LC low-pass filter, an error amplification circuit 11 amplifies an error signal between the negative feedback signal and an external input signal VIN, and a modulation circuit 12 pulse-modulates (PWM modulation, PDM modulation, etc.) the amplified error signal. A gate driving circuit 13 generates a gate driving signal of a switching element of the output stage 14 of the D-class power amplifier, and controls ON/OFF of the switching element. COPYRIGHT: (C)2007,JPO&INPIT
    • 要解决的问题:为了提供一种电容性负载驱动电路,其在D级功率放大器驱动电容性负载时,确保驱动频带中的均匀输出电压频率特性并实现低损耗驱动。 解决方案:在D级功率放大器的输出级14的输出侧设置LC低通滤波器15,并且将LC低通滤波器的输出施加到负载静电电容CL至 输出变压器T.在这种情况下,负反馈电路16反馈来自LC低通滤波器的后级的负反馈信号,误差放大电路11放大负反馈信号和外部输入之间的误差信号 信号VIN,并且调制电路12对放大的误差信号进行脉冲调制(PWM调制,PDM调制等)。 栅极驱动电路13产生D级功率放大器的输出级14的开关元件的栅极驱动信号,并控制开关元件的导通/截止。 版权所有(C)2007,JPO&INPIT