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2. 发明授权

US5661394A Switching power supply 失效
标题翻译：开关电源
公开(公告)号：US5661394A
公开(公告)日：1997-08-26
申请号：US492815
申请日：1995-06-20
申请人： Fumiaki Nakao , Tetsuya Suzuki , Katsuo Yamada , Shoichi Wakao
发明人： Fumiaki Nakao , Tetsuya Suzuki , Katsuo Yamada , Shoichi Wakao
IPC分类号： H02M7/217 , G05F1/656 , H02M1/42 , H02M3/155 , H02M7/12 , H03K17/30 , H02M7/00
CPC分类号： H02M1/4225 , G05F1/656 , Y02B70/126 , Y02P80/112
摘要： In a switching power supply a stable dc output voltage having a higher power factor is obtained even for an unstable ac input voltage using a sufficiently broadened duty ratio of the switching signal. The switching power supply include a rectifying circuit 10 for full-wave rectifying an ac input voltage to output a pulsating current, a chopper circuit having a switching device Q1 driven at a sufficiently higher frequency than that of the ac input voltage, an inductor L1 connected in series with the switching device Q1 between output terminals of the rectifying circuit 10, and a capacitor C1 for smoothing a current fed through the inductor L1 to supply a stabilized dc output voltage, an error amplifier 11 and a multiplier 12 for providing a threshold level signal having a full-wave rectified waveform, in which the phase thereof is the same as that of the ac input voltage, and an amplitude corresponding to an error voltage included in an output voltage of the chopper circuit, a comparator 13 for comparing the current of the switching device Q1 with the threshold level signal, and a monostable multivibrator 20 for driving the switching device Q1 according to the output signal of the comparator 13. The turn off time of Q1 becomes shorter when the immediately preceding turn on time becomes longer.
摘要翻译：在开关电源中，即使使用开关信号的足够宽的占空比，对于不稳定的交流输入电压，也获得具有较高功率因数的稳定的直流输出电压。开关电源包括用于对交流输入电压进行全波整流以输出脉动电流的整流电路10，具有以比交流输入电压充分高的频率驱动的开关器件Q1的斩波电路，连接的电感器L1 与整流电路10的输出端子之间的开关器件Q1和用于平滑通过电感器L1馈送的电流以提供稳定的直流输出电压的电容器C1串联;误差放大器11和用于提供阈值电平的乘法器12 信号具有全波整流波形，其相位与交流输入电压相同，振幅对应于斩波电路的输出电压中包含的误差电压;比较器13，用于比较电流具有阈值电平信号的开关器件Q1，以及用于根据该输出信号的输出信号驱动开关器件Q1的单稳态多谐振荡器20 当前一次接通时间变长时，Q1的关断时间变短。

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