IoT compatible electronic door chime
An electronic door chime can meet safety standards and be compatible with smart doorbells and IOT doorbells. Current generation smart doorbells, also called IOT doorbells, require continuous power to drive the cameras, audio interfaces, and other components within the smart doorbell. Compatibility issues with prior art doorbell systems have emerged with the smart doorbell receiving inadequate power or power that doesn't meet the smart doorbell's input specification. In some cases, a prior art doorbell system is driven to failure or to excessive temperatures when the smart doorbell continuously draws too much power. A new electronic door chime can safely power the smart doorbells while also being compatible with simple push button doorbell devices.
1. An electronic door chime comprising:
a back cover comprising a first compartment and a second compartment;
a front cover attached to the back cover to thereby form a housing that is configured to be installed in a dual voltage box;
a power supply in the first compartment configured to receive mains electric power and to produce a doorbell current; and
a first circuit that is in the second compartment and that includes a chiming circuit, a doorbell connector, an inductor, and a monitor circuit;
wherein the monitor circuit is connected in parallel to the inductor;
wherein the doorbell current includes an inductor current that passes through the inductor and a monitor current that passes through the monitor circuit;
wherein the inductor current passes into the doorbell connector, then through an external doorbell device, then back through the doorbell connector to thereby power the external doorbell device when the external doorbell device is connected to the doorbell connector;
wherein the monitor circuit produces a trigger sensed signal upon detecting actuation of the external doorbell device; and
wherein the chiming circuit sends a sound signal to a speaker upon receiving the trigger sensed signal to thereby cause the speaker to produce a sound.
2. The electronic door chime of claim 1 wherein the power supply is a transformer producing an AC output that is at least 18 VAC and at least 300 mA.
3. The electronic door chime of claim 1 wherein the power supply produces an AC output that is no more than 24 VAC, and wherein the AC output is no more than 10 VA.
4. The electronic door chime of claim 1 wherein the dual voltage box is a two-gang dual voltage junction box.
5. The electronic door chime of claim 1 wherein the doorbell current is an AC current produced by the power supply.
6. The electronic door chime of claim 1 wherein the trigger sensed signal is optically isolated from the doorbell current.
7. The electronic door chime of claim 1 further comprising a faceplate attached to the front cover and configured to cover the electronic door chime when the housing is installed in the dual voltage box.
8. The electronic door chime of claim 1 further comprising the external doorbell device, the external doorbell device comprising a rectifier, a switch, and a light emitting diode configured to light only when the switch is open.
9. The electronic door chime of claim 1 wherein the back cover and the front cover are plastic and have a minimum thickness of 2.2 mm.
10. The electronic door chime of claim 1 , the first circuit further comprising
a second doorbell connector, a second inductor circuit and a second monitor circuit connected in parallel with the second inductor circuit, the first circuit configured to pass a second doorbell current through a second external doorbell device connected to the second doorbell connector;
wherein the second doorbell current is produced by the power supply and comprises a plurality of second currents comprising a second inductor current passing through the second inductor circuit and a second monitor current passing through the second monitor circuit;
wherein the second monitor circuit produces a second trigger sensed signal upon detecting actuation of the second external doorbell device; and
wherein the chiming circuit sends the sound signal to the speaker upon receiving the second trigger sensed signal to thereby cause the speaker to produce the sound.
11. The electronic door chime of claim 10 further comprising:
a faceplate attached to the front cover and configured to cover the electronic door chime when the housing is installed in the dual voltage box;
the external doorbell device, the external doorbell device comprising a rectifier, a switch, and a light emitting diode configured to light only when the switch is open; and
the second external doorbell device;
wherein the power supply is a transformer producing an AC output that is at least 18 VAC and at least 300 mA;
wherein the AC output is no more than 24 VAC and is no more than 10 VA;
wherein the dual voltage box is a two-gang dual voltage junction box;
wherein the back cover and the front cover are plastic and have a minimum thickness of 2.2 mm;
wherein the doorbell current is an AC current produced by the power supply;
wherein the second doorbell current is another AC current produced by the power supply;
wherein the trigger sensed signal is optically isolated from the doorbell current; and
wherein the second trigger sensed signal is optically isolated from the second doorbell current.
12. A method comprising:
positioning a power supply in a first compartment of a back cover, the back cover comprising the first compartment and a second compartment, the power supply configured to receive mains electric power and to produce a doorbell current; and
positioning a first circuit in the second compartment, the first circuit comprising a chiming circuit, a doorbell connector, an inductor, and a monitor circuit; and
enclosing the first compartment and the second compartment by attaching a front cover to the back cover, thereby forming a housing that is configured to be installed in a dual voltage box;
wherein the monitor circuit is connected in parallel to the inductor;
wherein the doorbell current includes an inductor current that passes through the inductor and a monitor current that passes through the monitor circuit;
wherein the inductor current passes into the doorbell connector, then through an external doorbell device, then back through the doorbell connector when the external doorbell device is connected to the doorbell connector;
wherein the monitor circuit produces a trigger sensed signal upon detecting actuation of the external doorbell device; and
wherein the chiming circuit sends a sound signal to a speaker upon receiving the trigger sensed signal to thereby cause the speaker to produce a sound.
13. The method of claim 12 further comprising providing the external doorbell device.
14. The method of claim 13 wherein the external doorbell device comprises a rectifier, a switch, and a light emitting diode configured to light only when the switch is open.
15. The method of claim 12 wherein the power supply is a transformer producing an AC output, and wherein the AC output is at least 18 VAC and at least 300 mA.
16. The method of claim 12 wherein the power supply produces an AC output that is no more than 24 VAC and wherein the AC output is no more than 10 VA.
17. The method of claim 12 wherein the dual voltage box is a two-gang dual voltage junction box.
18. The electronic door chime of claim 1 , wherein the monitor circuit includes a rectifier that is electrically parallel to the inductor.
19. The electronic door chime of claim 18 , wherein activation of a doorbell of the external doorbell device results in the rectifier becoming powered and thereby providing a current to an optoisolator input stage of an optoisolator.