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    • 3. 发明授权
    • Power supply device and lighting equipment
    • 电源设备和照明设备
    • US08354804B2
    • 2013-01-15
    • US12873744
    • 2010-09-01
    • Hirokazu OtakeMitsuhiko NishiieTakuro HiramatsuKeiichi Shimizu
    • Hirokazu OtakeMitsuhiko NishiieTakuro HiramatsuKeiichi Shimizu
    • H05B37/02
    • H05B37/02H02M3/33507H02M2001/0025H05B33/0803H05B33/0815H05B33/0848Y02B20/347
    • In a power supply device according to one embodiment, a reference signal (Vref1), which changes from a value corresponding to a maximum current in a full lighting state to that corresponding to a minimum current in case of a deepest dimming depth, and a reference signal (Vref2), which changes from a value corresponding to a load voltage at the time of a maximum current in a full lighting state to that corresponding to a minimum current in case of the deepest dimming depth, are prepared in accordance with dimming depths of a dimming signal. In a shallow dimming depth region close to a full lighting state, the reference signal (Vref1) is selected to apply constant-current control to light-emitting diodes in a current control mode. In a deep dimming depth region, the reference signal (Vref2) is selected to apply constant-voltage control to the diodes in a voltage control mode.
    • 在根据一个实施例的电源装置中,在最深调光深度的情况下,从与完全点亮状态中的最大电流相对应的值与对应于最小电流的值相对应的参考信号(Vref1)和参考信号 根据调光深度,准备从完全点亮状态时的最大电流时的负载电压值与最深度调光深度情况下的最小电流对应的值变化的信号(Vref2) 一个调光信号。 在接近完全点亮状态的浅调光深度区域中,选择参考信号(Vref1),以电流控制模式对发光二极管施加恒流控制。 在深度较深的深度区域中,选择参考信号(Vref2)以在电压控制模式中对二极管施加恒定电压控制。