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    • 10. 发明公开
    • PVM CONTROLLER WITH AUTOMATIC LOW BATTERY POWER REDUCTION CIRCUIT AND LIGHTING DEVICE INCORPORATING THE CONTROLLER
    • 具有自动低电量电力减少电路的PVM控制器以及包含控制器的照明装置
    • EP1504316A1
    • 2005-02-09
    • EP03721900.3
    • 2003-04-28
    • Vector Products, Inc.
    • KRIEGER, MichaelRANDOLPH, Brucec/o Vector Prodicts, Inc.SHUM, Henryc/o Sunluxe Enterprises, Ltd.
    • G05F1/00
    • H05B39/047H05B41/2853Y02B20/186
    • A controller for controlling a voltage applied to a load (500) from a power source (100) includes a square wave producing circuit (300) for connection in the circuit with the battery and the lamp. The square wave producing circuit (300) produces a variable duty cycle square wave for controlling application of power to the load in accordance with the duty cycle of the square wave in response to a voltage at the control input. A voltage varying circuit is connected to the power source for producing a selectively variable voltage that is fed to the control input of the square wave producing circuit for selectively adjusting the duty cycle of the square wave. A low voltage detection circuit (400) is connected to the power source and coupled to the control input of the square wave producing circuit for automatically producing a voltage that decreases the duty cycle of the square wave when the battery voltage decreases to or below a predetermined level.
    • 用于控制从电源(100)施加到负载(500)的电压的控制器包括用于在电路中与电池和灯连接的方波产生电路(300)。 方波产生电路(300)产生可变的占空比方波,用于响应于控制输入端的电压根据方波的占空比来控制向负载施加功率。 电压变化电路连接到电源,用于产生选择性可变电压,该电压被馈送到方波产生电路的控制输入端,用于选择性地调整方波的占空比。 低电压检测电路(400)连接到电源并且耦合到方波产生电路的控制输入端,用于在电池电压降低到或低于预定值时自动产生减小方波的占空比的电压 水平。