Connected LED lamp implemented on a single metal core printed circuit board
A lamp includes a single 1-layer metal core printed circuit board (PCB). The 1-layer metal core PCB includes a plurality of light emitting diodes (LEDs), an LED driver circuit, a microcontroller unit (MCU) providing wireless connectivity and control for the LED driver circuit, and a power supply circuit providing power for the LEDs and the MCU. The lamp includes an antenna, e.g., helical or monopole, mounted on the single 1-layer metal core PCB. Capacitor(s) and/or inductor(s) may be mounted on a bottom side of the 1-layer metal core PCB opposite a top side of the 1-layer metal core PCB on which the LEDs are mounted. The lamp is line powered. The LEDs are disposed on a periphery of a top side of the PCB and the MCU and other circuitry is disposed on the top side of the PCB inside of the periphery.
1 . A lamp comprising:
a printed circuit board (PCB);
wherein the PCB includes,
a plurality of light emitting diodes (LEDs) disposed on a periphery of the PCB;
an LED driver circuit;
a microcontroller unit (MCU) with wireless capability to provide wireless connectivity and control for the LED driver circuit;
a power supply circuit coupled to receive AC power and supply power for the LEDs, the LED driver circuit, and the MCU;
an antenna coupled to the MCU;
a pad through which the antenna is coupled to the PCB; and
wherein the antenna is resonated with a capacitance of the pad and a resonant frequency generated using the capacitance of the pad and an impedance of the antenna is tuned to an RF operating frequency.
2 . The lamp as recited in claim 1 wherein the PCB is a 1-layer metal core PCB.
3 . The lamp as recited in claim 2 wherein the antenna is a helical antenna mounted on the 1-layer metal core PCB.
4 . The lamp as recited in claim 2 wherein the antenna is a monopole antenna mounted on the 1-layer metal core PCB.
5 . The lamp as recited in claim 2 further comprising at least one capacitor mounted on a bottom side of the 1-layer metal core PCB opposite a top side on which the LEDs are disposed and coupled to the top side through slots in the PCB.
6 . The lamp as recited in claim 2 further comprising at least one inductor mounted on a bottom side of the 1-layer metal core PCB opposite a top side on which the LEDs are disposed and coupled to the top side through slots in the PCB.
7 . The lamp as recited in claim 1 wherein the antenna is coupled to the MCU through a matching network.
8 . The lamp as recited in claim 1 wherein the LED driver circuit comprises:
a first transistor configured to turn on a first segment the plurality of LEDs responsive to assertion of a first transistor control signal controlled by the MCU; and
a second transistor configured to turn on the first segment and a second segment of the plurality of LEDs, responsive to assertion of a second transistor control signal controlled by the MCU.
9 . The lamp as recited in claim 1 wherein the LED driver circuit is disposed inside the periphery.
10 . A lamp comprising:
a 1-layer metal core printed circuit board (PCB);
wherein the 1-layer metal core PCB includes,
a plurality of light emitting diodes (LEDs);
an LED driver circuit to drive the LEDs;
a microcontroller unit (MCU) providing wireless connectivity and control for the LED driver circuit;
a power supply circuit coupled to an AC source and providing power for the LEDs, the LED driver circuit, and the MCU;
a pad through an antenna is coupled to the 1-layer metal core PCB; and
wherein the antenna is resonated with a capacitance of the pad and a resonant frequency generated using the pad and an impedance of the antenna is tuned to a radio frequency (RF) operating frequency.
11 . The lamp as recited in claim 10 wherein the antenna is a helical antenna.
12 . The lamp as recited in claim 10 wherein the antenna is a monopole antenna.
13 . The lamp as recited in claim 10 further comprising at least one capacitor mounted on a bottom side of the 1-layer metal core PCB opposite a top side of the 1-layer metal core PCB on which the LEDs are mounted and coupled to the top side through slots in the PCB.
14 . The lamp as recited in claim 10 further comprising at least one inductor mounted on a bottom side of the 1-layer metal core PCB opposite a top side of the 1-layer metal core PCB on which the LEDs are mounted and coupled to the top side through slots in the PCB.
15 . The lamp as recited in claim 10 wherein the LEDs are disposed on a periphery of a top side of the 1-layer metal core PCB and the MCU is disposed on the top side of the 1-layer metal core PCB inside of the periphery.
16 . A lamp comprising:
a single 1-layer metal core printed circuit board (PCB);
wherein the 1-layer metal core PCB includes,
a plurality of light emitting diodes (LEDs) arranged on a periphery of the 1-layer metal core PCB;
an LED driver circuit;
a microcontroller unit (MCU) providing wireless connectivity and control for the LED driver circuit;
a power supply circuit coupled to an AC source and providing power for the LEDs, the LED driver circuit, and the MCU; and
wherein voltage gradually decreases from the periphery to a center of the single 1-layer metal core PCB.
17 . The lamp as recited in claim 16 wherein the single 1-layer metal core PCB further comprises:
a pad through which an antenna is coupled to the single 1-layer metal core PCB; and
wherein the antenna is resonated with a capacitance of the pad and a resonant frequency generated using the capacitance of the pad and an impedance of the antenna is tuned to a radio frequency (RF) operating frequency.