Patent ID: 6091201
Filing Date: 2000-07-18
Classification: H05B

Abstract:
An input circuit for a dimming circuit control unit having a single input signal protocol, said input circuit comprising:a first input line to receive a first input voltage signal;a first voltage divider electrically connected to said first input line to receive the first input voltage signal and to divide a first voltage of the first input voltage signal, said first voltage divider having a first output terminal;a second input line to receive a second input voltage signal;a second voltage divider electrically connected to said second input line, to receive the second input voltage signal and to divide a second voltage of the second input voltage signal, said voltage divider having a second output terminal;an OR terminal connecting said first output terminal to said second output terminal;an inverter connected between said first voltage divider and said OR terminal to invert said first input voltage signal to eliminate a signal polarity to be received by the dimming circuit control unit; andan analog to digital converter electrically connected to said first output terminal of said first voltage divider to convert the first voltage from said first voltage divider when the first input signal is analog such that the dimming circuit control unit always receives a digital signal having the single input signal protocol.