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    • 4. 发明申请
    • Power supply circuit and electronic appliance therewith
    • 电源电路及其电子设备
    • US20070046660A1
    • 2007-03-01
    • US11503916
    • 2006-08-15
    • Tsutomu Satoh
    • Tsutomu Satoh
    • G09G5/00
    • H05B33/0827
    • A power supply circuit (10) has a current control portion (5) that controls, at a predetermined level, the currents passed through LEDs (3) and (4); a current setting portion (6) that sets, in the current control portion (5), the level of currents to be passed through the LEDs (3) and (4); and a checking portion (7) that checks whether or not currents at the current level set by the current setting portion (6) can be passed through the LEDs (3) and (4). The checking portion (7), on recognizing a condition in which at least one of the LEDs (3) and (4) cannot be fed with a current at the level set by the current setting portion (6), feeds the current setting portion (6) with a signal indicating the condition; on receiving the signal, the current setting portion (6) changes the currently set current level to a current level at which currents can be passed through both the LEDs (3) and (4). This helps realize an LED driving power supply circuit that, despite having a small circuit scale, tolerates a wide range for the supplied voltage.
    • 电源电路(10)具有电流控制部分(5),其以预定电平控制通过LED(3)和(4)的电流; 在电流控制部分(5)中设置要通过LED(3)和(4)的电流的电平的电流设定部分(6); 以及检查部(7),其检查由当前设定部(6)设定的电流是否能够通过LED(3)和(4)。 检查部分(7)在识别到其中至少一个LED(3)和(4)不能以当前设置部分(6)设置的电平的电流馈送的状态时,馈送当前设置部分 (6)具有指示条件的信号; 在接收到信号时,电流设定部分(6)将当前设定的电流电平改变为能够通过LED(3)和(4)两者的电流的电流电平。 这有助于实现尽可能小的电路规模的LED驱动电源电路,其容许供电电压范围很宽。