LIGHTING DEVICE

摘要

A lighting device includes a lighting unit, a control unit, and a brightness adjusting unit connected between the control unit and the lighting unit. The brightness adjusting unit includes an operational amplifier and a number of branch circuits parallel connected between the control unit and a positive input terminal of the operational amplifier. Each branch circuit includes a diode and a photoresistor. A reference voltage is applied to an inverting input terminal of the operational amplifier. The operational amplifier compares a voltage on the positive input terminal and the reference voltage, and output a voltage via an output terminal to the lighting unit according to a comparing result. The control unit further controls the diode to switch between a turned on state and a turned off state to adjust the sensitivity of the lighting device in response to user input.

主权项

1. A lighting device comprising:
a lighting unit configured to emit light; a control unit comprising a plurality of data input ports and a plurality of output ports; and a brightness adjusting unit connected between the lighting unit and the control unit, the brightness adjusting unit being connected to the control unit via the output ports, the brightness adjusting unit comprising an operational amplifier and a plurality of branch circuits connected between the control unit and the operational amplifier in parallel, each branch circuit comprising a diode and a photoresistor; wherein the photoresistor is a light-controlled variable resistor; an anode of each diode is connected to one of the output ports of the control unit, a cathode of each diode is connected to a positive input terminal of the operational amplifier via the corresponding photoresistor; an inverting input terminal of the operational amplifier receives a reference voltage; an output terminal of the operation amplifier is connected to the lighting unit, the operational amplifier compares a voltage of the non-inverting input terminal and a voltage of the inverting input terminal to obtain a comparison result, and outputs a corresponding voltage to the lighting unit via the output terminal according to the comparison result.