公开(公告)号：US5705895A

公开(公告)日：1998-01-06

申请号：US572664

申请日：1995-12-14

申请人： Masaaki Mihara

发明人： Masaaki Mihara

IPC分类号： G04G19/02 ,  G04G9/00 ,  H02M7/48 ,  H02M7/538 ,  H05B33/08 ,  H05B37/02

CPC分类号： H05B33/08 ,  Y02B20/325 ,  Y10S315/05

摘要： A power terminal is connected to a DC power source. A differential amplifier has primary and secondary input terminals and an output terminal, and a device applies a reference voltage to the secondary input terminal of the differential amplifier. A phase inverter has an input terminal connected to the output terminal of the differential amplifier and has primary and secondary output terminals that output two output signals of opposite phase. A push-pull drive circuit has primary and secondary input terminals connected to the primary and secondary output terminals of the phase inverter, and has primary and secondary output terminals connected to a switching element that alternately turns on and off by being driven by the two output signals of opposite phase that are provided from the output terminals of the phase inverter. An autotransformer has a tap connected to the power terminal and taps, provided at both sides of the tap connected to the power terminal, that are connected to the primary and secondary output terminals at the push-pull drive circuit, respectively. A capacitive load may be connected at both sides of the autotransformer. A positive feedback path connects one terminal of the autotransformer to the primary input terminal of the differential amplifier, and a sinusoidal AC voltage is applied to the capacitive load. A duty ratio conversion circuit automatically changes the duty ratio of drive signals for the push-pull drive circuit according to the resonance frequency that is determined by the inductance of the autotransformer and the capacitance of the capacitive load. The duty ratio conversion circuit is connected between the phase inverter and the push-pull drive circuit.

摘要翻译： 电源端子连接到直流电源。 差分放大器具有一次和二次输入端子和一个输出端子，并且器件将参考电压施加到差分放大器的次级输入端子。 一个相位逆变器的输入端连接到差分放大器的输出端，并具有输出相反相位的两个输出信号的初级和次级输出端。 推挽驱动电路具有连接到相位逆变器的主输出端和次输出端的初级和次级输入端，并且具有连接到开关元件的初级和次级输出端子，其通过由两个输出驱动而交替地导通和关断 从相变器的输出端子提供的反相信号。 自耦变压器具有连接到电源端子的抽头和分别连接到电源端子的抽头两侧的抽头，分别连接到推挽驱动电路的主输出端和次输出端。 电容性负载可以连接在自耦变压器的两侧。 正反馈路径将自耦变压器的一个端子连接到差分放大器的主输入端，并且正弦交流电压被施加到电容性负载。 占空比转换电路根据由自耦变压器的电感和容性负载的电容确定的谐振频率自动改变推挽驱动电路的驱动信号的占空比。 占空比转换电路连接在相位逆变器和推挽驱动电路之间。

公开(公告)号：US5838113A

公开(公告)日：1998-11-17

申请号：US608183

申请日：1996-02-28

申请人： Masaaki Mihara

发明人： Masaaki Mihara

IPC分类号： G04B19/30 ,  G04G9/00 ,  H02M7/537 ,  H05B33/08 ,  H05B37/02

CPC分类号： H05B33/08 ,  Y02B20/325

摘要： A power supply circuit for driving a capacitive load includes a driving pulse generation circuit that generates a driving pulse of a specified frequency, a single drive circuit that is controlled by this driving pulse, and an autotransformer, where a center tap is connected to a source voltage, and forms a resonant circuit by using an autotransformer and a capacitive load, which is connected thereto. Alternatively, instead of driving pulse generation circuit, it includes a differential amplifier and a positive feedback path that performs positive feedback from one of the terminals of the autotransformer to the input terminal of the differential amplifier. In this manner, by driving the autotransformer using the single drive circuit, the entire autotransformer can be utilized in an efficient manner and a smaller and cheaper power supply circuit can be realized.

摘要翻译： 用于驱动电容性负载的电源电路包括产生指定频率的驱动脉冲的驱动脉冲产生电路，由该驱动脉冲控制的单个驱动电路和自耦变压器，其中中心抽头连接到源极 并且通过使用与其连接的自耦变压器和电容性负载来形成谐振电路。 或者，代替驱动脉冲发生电路，它包括差分放大器和正反馈路径，其执行从自耦变压器的一个端子到差分放大器的输入端的正反馈。 以这种方式，通过使用单个驱动电路驱动自耦变压器，可以有效地利用整个自耦变压器，并且可以实现更小和更便宜的电源电路。

公开(公告)号：US5774352A

公开(公告)日：1998-06-30

申请号：US572118

申请日：1995-12-14

申请人： Masaaki Mihara

发明人： Masaaki Mihara

IPC分类号： G04G19/02 ,  G04G9/00 ,  H02M7/48 ,  H02M7/538 ,  H05B33/08 ,  H02M3/335 ,  H02M7/217

CPC分类号： H02M7/53806 ,  H05B33/08 ,  Y02B20/325

摘要： A power terminal is connected to a DC power source. A differential amplifier has primary and secondary input terminals and an output terminal, and a device applies a reference voltage to the secondary input terminal of the differential amplifier. A phase inverter has an input terminal connected to the output terminal of the differential amplifier and has primary and secondary output terminals that output two output signals of opposite phase. A push-pull drive circuit has primary and secondary input terminals connected to the primary and secondary output terminals of the phase inverter, and has primary and secondary output terminals connected to a switching element that alternately turns on and off by being driven by the two output signals of opposite phase that are provided from the output terminals of the phase inverter. An autotransformer has a tap connected to the power terminal and taps, provided at both sides of the tap connected to the power terminal, that are connected to the primary and secondary output terminals at the push-pull drive circuit, respectively. A capacitive load may be connected at both sides of the autotransformer. A positive feedback path connects one terminal of the autotransformer to the primary input terminal of the differential amplifier, and a sinusoidal AC voltage is applied to the capacitive load.