Patent ID: 9282665
Filing Date: 2016-03-08
CPC Classification: G08B,H05B,Y02B

Claim Text:
1. An illuminated doorbell chime comprising: a main power supply; one or more LED lights; a chime having a chime coil; a circuit having a power supply unit, an LED driver and a chime driver, wherein said power supply unit is connected to said one or more LED lights and said chime coil, said LED driver is connected to said one or more LED lights, and said chime driver is connected to said chime coil; a door switch connected between said main power supply and said power supply unit of said chime circuit for selectively applying power to said power supply unit; said LED driver circuit having a bipolar junction transistor, a base Zener diode, and a voltage divider, wherein a collector of said bipolar junction transistor is connected to said one or more LED lights, an emitter of said bipolar junction transistor is connect to said common through a current limiting resistor, and a base of said bipolar junction transistor is connected to a voltage output of said voltage divider, with said voltage divider having a high end connected to a cathode of said base Zener diode and said voltage divider having a low end connected to said common, and wherein an anode of said base Zener diode is connected to common; said chime driver having a Mosfet transistor, a gate resistor, a gate capacitor, and a gate Zener diode, wherein a drain of said Mosfet transistor is connected to said chime coil and said base Zener diode of said LED driver circuit, a gate of said Mosfet transistor is connected to said gate resistor, said gate storage capacitor and an anode of said gate Zener diode, with said gate resistor connector and said gate storage capacitor connected to said common, and wherein said source of said Mosfet transistor is connected to said common; and said LED driver and said chime driver being interconnected, with a gate cathode of said gate Zener diode connected to said collector of said bipolar junction transistor, and a cathode of said base Zener diode connected to said drain of said Mosfet transistor, such that said door switch being activated applies supply voltage to said chime coil and said gate of said Mosfet transistor to pass operating current through said chime coil and said Mosfet transistor, and reduces applied voltage to said base of said bipolar junction transistor to turn off said LED lights.