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    • 9. 发明申请
    • Capacitive load driving circuit and method, liquid droplet ejection device, and piezoelectric speaker driving device
    • 电容负载驱动电路和方法,液滴喷射装置和压电扬声器驱动装置
    • US20070079710A1
    • 2007-04-12
    • US11349399
    • 2006-02-06
    • Sunao Ishizaki
    • Sunao Ishizaki
    • B41F3/42
    • B41J2/04581B41J2/04541H04R3/00H04R17/00
    • There is provided a capacitive load driving circuit which applies a driving signal to a capacitive load. The driving circuit includes: an operational amplifier outputting a difference signal between signals from an inverting input terminal and a non-inverting input terminal, and setting a loop gain; a pulse width modulator pulse-width-modulating the difference signal outputted by the operational amplifier, and outputting resultant digital signal; a digital voltage amplifier amplifying a voltage of the digital signal; a first filter smoothing a digital signal from the digital voltage amplifier, and supplying a smoothed signal to the capacitive load as the driving signal; an impedance converting circuit converting an impedance of an output signal of the first filter; and a first feedback circuit feeding-back the driving signal, which is outputted from the first filter, to the inverting input terminal of the operational amplifier via the impedance converting circuit.
    • 提供了一种向电容性负载施加驱动信号的电容性负载驱动电路。 驱动电路包括:运算放大器,输出来自反相输入端子和非反相输入端子的信号之间的差分信号,并设定环路增益; 对由运算放大器输出的差信号进行脉宽调制的脉冲宽度调制器,并输出结果数字信号; 放大数字信号的电压的数字电压放大器; 平滑来自数字电压放大器的数字信号的第一滤波器,并将平滑的信号提供给电容性负载作为驱动信号; 阻抗转换电路,转换第一滤波器的输出信号的阻抗; 并且第一反馈电路经由阻抗转换电路将从第一滤波器输出的驱动信号反馈到运算放大器的反相输入端。