发明授权
US07461281B2 Capacitive load driving circuit, electrostatic transducer, method of setting circuit constant, ultrasonic speaker, display device, and directional acoustic system
失效
电容负载驱动电路，静电传感器，电路常数设定方法，超声波扬声器，显示装置和定向声系统
- 专利标题： Capacitive load driving circuit, electrostatic transducer, method of setting circuit constant, ultrasonic speaker, display device, and directional acoustic system
- 专利标题（中）： 电容负载驱动电路，静电传感器，电路常数设定方法，超声波扬声器，显示装置和定向声系统
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申请号： US11564651申请日： 2006-11-29
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公开(公告)号： US07461281B2公开(公告)日： 2008-12-02
- 发明人: Shinichi Miyazaki
- 申请人： Shinichi Miyazaki
- 申请人地址： JP Tokyo
- 专利权人： Seiko Epson Corporation
- 当前专利权人： Seiko Epson Corporation
- 当前专利权人地址： JP Tokyo
- 代理机构： Oliff & Berridge, PLC
- 优先权： JP2005-343307 20051129; JP2006-281683 20061016
- 主分类号： G06F1/00
- IPC分类号： G06F1/00 ; H04R5/02
摘要：
A capacitive load driving circuit includes an error amplification circuit that amplifies a difference between an external input signal provided to one input terminal and a negative feedback signal provided from the negative feedback circuit to another input terminal; a modulation circuit; a power switching circuit; a gate driving circuit; a low-pass filter connected to an output side of the power switching circuit and that removes switching carrier components included in an output signal of the power switching circuit; an output transformer that boosts an output signal of the low-pass filter and has a primary winding connected to an output terminal of the filter; a capacitive load that is connected in parallel with a secondary winding of the output transformer; and the negative feedback circuit performs a negative feedback from the output terminal of the low-pass filter to an input side of the error amplification circuit.
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