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    • 4. 发明申请
    • MICROCOMPUTER AND SWITCHING POWER SUPPLY DEVICE
    • 微型计算机和开关电源装置
    • US20110279105A1
    • 2011-11-17
    • US13104563
    • 2011-05-10
    • Shinichi HIROSE
    • Shinichi HIROSE
    • G05F3/16
    • H02M3/156H02M3/1584H02M3/1588H02M2001/0003Y02B70/1466
    • The present invention provides a switching power supply device that is capable of steadily operating even when a low supply voltage is employed. The present invention also provides a microcomputer equipped with the switching power supply device. A switching regulator includes an inductor that inputs an external supply voltage at one end, a main switch that is coupled to another end of the inductor, an auxiliary switch that is coupled to the other end of the inductor in parallel with the main switch, and a rectifying/smoothing circuit having a diode and a capacitor. A switching operation of the main switch is controlled by a control signal generated from a PFM control circuit, which is driven by an internal supply voltage. A switching operation of the auxiliary switch is controlled by a control signal generated from a ring oscillator, which is driven by the external supply voltage.
    • 本发明提供即使在采用低电源电压时也能稳定运行的开关电源装置。 本发明还提供一种配备有开关电源装置的微型计算机。 开关调节器包括一端输入外部电源电压的电感器,耦合到电感器另一端的主开关,与主开关并联耦合到电感器另一端的辅助开关,以及 具有二极管和电容器的整流/平滑电路。 通过由内部电源电压驱动的PFM控制电路产生的控制信号来控制主开关的开关动作。 辅助开关的开关操作由由外部电源电压驱动的环形振荡器产生的控制信号控制。