Data signal receiving circuit for controlling lighting
The invention provides a data signal receiving circuit for controlling lighting which is in response to different limit values of input currents of control signals and the control signals with different transmission speeds by using the same circuits. A rectification part (20) carries out half-wave r...
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Zusammenfassung: | The invention provides a data signal receiving circuit for controlling lighting which is in response to different limit values of input currents of control signals and the control signals with different transmission speeds by using the same circuits. A rectification part (20) carries out half-wave rectification on the data signal for controlling lighting. Constant current circuits (30, 40) are in series connection with an input side of optical couplers (31, 41) in which data signal for controlling lighting is input, wherein the half-wave rectification is carried out on the data signal for controlling lighting. The input current of the optical couplers (31, 41) is limited according to a first control signal of the control signals, wherein the current value of the first control signal is limited. Pull-up resistors (33, 43) are connected to an output side of the optical couplers (31, 41). A switch part (23) switches the circuit structure so as to make at least one of a resistance value of the constant current circuits (30, 40) and the resistance value of the pull-up resistor to lower when data signal is a second control signal in which the current value of the control signals is not limited and the transmission speeds are faster than the first control signal. |
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