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 . A system comprising:
a housing of an electronic door chime;
a first circuit that is in the housing and that includes a doorbell connector, an inductor, a monitor circuit connected in parallel to the inductor, and a power supply,
wherein:
the power supply is configured to receive mains electric power and to produce a doorbell current that passes through an external doorbell device connected to the doorbell connector;
the doorbell current includes a monitor current that passes through the monitor circuit;
the doorbell current includes an inductor current that passes into the doorbell connector, then through the 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; and
the first circuit is configured to send a sound signal to a speaker upon detecting actuation of the external doorbell device.
2 . The system 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 system 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 system of claim 1 wherein the housing is conjured to be installed in a junction box is a two-gang dual voltage junction box.
5 . The system of claim 1 wherein the doorbell current is an AC current produced by the power supply.
6 . The system of claim 1 wherein the monitor circuit produces a trigger sensed signal that is optically isolated from the doorbell current.
7 . The system of claim 1 further comprising a faceplate and a front cover that are configured to cover the electronic door chime when the housing is installed in a junction box.
8 . The system 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 system of claim 1 wherein the housing has a minimum thickness of 2.2 mm.
10 . The system 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.
11 . The system of claim 10 further comprising:
a faceplate configured to cover the electronic door chime when the housing is installed in a junction 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;
the AC output is no more than 24 VAC and is no more than 10 VA;
the junction box is a two-gang dual voltage junction box;
the housing is plastic and has a minimum thickness of 2.2 mm;
the doorbell current is an AC current produced by the power supply;
the second doorbell current is produced by the power supply; and
the monitor circuit produces a trigger sensed signal that is optically isolated from the doorbell current.
12 . The system of claim 1 , wherein the monitor circuit includes a rectifier that is electrically parallel to the inductor.
13 . A method comprising:
positioning a first circuit in a housing of an electronic door chime, the first circuit including a doorbell connector, an inductor, a monitor circuit connected in parallel to the inductor, and a power supply,
wherein:
the power supply is configured to receive mains electric power and to produce a doorbell current that passes through an external doorbell device connected to the doorbell connector;
the doorbell current includes a monitor current that passes through the monitor circuit;
the doorbell current includes an inductor current that passes into the doorbell connector, then through the 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; and
the first circuit is configured to send a sound signal to a speaker upon detecting actuation of the external doorbell device.
14 . The method of claim 13 , further including providing the external doorbell device.
15 . 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.
16 . The method of claim 13 , 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.
17 . The method of claim 13 , 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.
18 . The method of claim 13 , wherein the housing is configured to be installed in a two-gang dual voltage junction box.
19 . A system comprising:
a power supply configured to produce a doorbell current that includes a monitor current and an inductor current;
a doorbell connector configured to pass the doorbell current through an external doorbell device to thereby power the external doorbell device;
an inductor in parallel with a monitor circuit such that the inductor current passes through the inductor and the monitor current passes through the monitor circuit;
wherein:
the monitor circuit includes a rectifier that produces an optoisolator input current in response to activation of a doorbell of the external doorbell device;
the monitor circuit includes an optoisolator that produces a trigger sensed signal in response to the optoisolator input current; and
the rectifier is electrically parallel to the inductor.
20 . The system of claim 19 , wherein the rectifier is configured to be powered in response to activation of the doorbell of the external doorbell device.