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    • 7. 发明授权
    • DC/DC converter and RS-232 interface circuit using the same
    • DC / DC转换器和RS-232接口电路使用相同
    • US5463542A
    • 1995-10-31
    • US383685
    • 1995-02-01
    • Kouhei Okamoto
    • Kouhei Okamoto
    • G06F3/00H02M1/10H02M3/07H02M3/155H02M3/18
    • H02M3/07
    • There is provided a circuit for achieving a serial communication at the standard voltage defined in the RS-232 interface communication standard when the signal processing voltage of the host side circuit is 5 V and 3 V, for example, in which, when the DC input voltage V.sub.in of the host side circuit is changed, this voltage level is detected to generate a stepped-up voltage having an appropriate step-up ratio by step-up circuits. This voltage level is detected to, regardless of the change of the power supply voltage, obtain the positive and negative DC output voltages Vdd, Vss matching with the RS-232 interface communication standard. To be specific, with the 5 V operation, a double stepped-up voltage within the DC/DC converter circuit and, during the 3 V operation, a three times stepped-up voltage are selectively generated to obtain the DC output voltage.
    • 当主机侧电路的信号处理电压为5V和3V时,提供了用于在RS-232接口通信标准中定义的标准电压下实现串行通信的电路,例如,当DC输入 主电路电路的电压Vin被改变,该电压电平被检测,以通过升压电路产生具有适当的升压比的升压电压。 检测到该电压电平,无论电源电压的变化如何,获得与RS-232接口通信标准匹配的正,负直流输出电压Vdd,Vss。 具体地说,通过5V操作,选择性地产生DC / DC转换器电路内的双重升压电压,并且在3V工作期间,选择性地产生三次升压电压以获得DC输出电压。