Smart and robust wall socket with integrated universal serial bus (USB)
A smart electrical plug supports one or more electrical outlets and one or more universal serial bus (USB) outlets for charging electrical devices. Electrical power consumed through the one or more electrical outlets may be measured individually or in combination and reported via a wireless communication channel. The smart electrical plug may be implemented by a plurality of printed circuit board assemblies and distributed within a housing to reduce the effects of heat dissipation. The smart electrical plug may further reduce heat dissipation by utilizing one or more electrical circuit approaches.
1. A smart electrical plug comprising:
an electrical input coupler configured to electrically connect to an electrical power source, wherein the electrical power source includes a Live (L) line, a Neutral (N) line, and a Ground (G) line;
a first electrical output socket;
a second electrical output socket;
an electrical current sensor arrangement configured to generate at least one signal indicative of a first electrical current through the first electrical output socket and a second electrical current through the second electrical output socket;
a voltage divider electrical circuit configured to provide a first signal indicative of a voltage at the electrical input coupler;
an electrical power measurement device configured to measure a measured electrical power based on the voltage and the at least one signal, the measured electrical power indicative of a first electrical power consumed through the first electrical output socket and a second electrical power consumed through the second electrical output socket;
a communication interface electrically coupled to the electrical power measurement device and configured to transmit a communication signal, the communication signal indicative of the measured electrical power;
at least one universal serial bus (USB) charging socket;
a USB port controller configured to control an electrical output of the at least one USB charging socket;
a temperature switch configured to:
detect when an internal temperature within the smart electrical plug exceeds a first predetermined temperature; and
in response to the detecting, generate a second signal to the USB port controller; and
generate a third signal when the internal temperature is below a second predetermined temperature after previously exceeding the first predetermined temperature; and
the USB port controller configured to:
cut the electrical output of the at least one USB charging socket when the second signal is received from the temperature switch; and
resume the electrical output of the at least one USB charging socket when the third signal is received from the temperature switch.
2. The smart electrical plug of claim 1 , wherein the electrical current sensor arrangement comprises:
a first current sensor configured to generate a fourth signal indicative of the first electrical current; and
a second current sensor configure to generate a fifth signal indicative of the second electrical current.
3. The smart electrical plug of claim 2 , wherein the first and second current sensors are coupled to the L line.
4. The smart electrical plug of claim 2 , wherein the first and second current sensors are coupled to the N line.
5. The smart electrical plug of claim 1 , wherein the electrical current sensor arrangement comprises:
a single current sensor configured to:
directly sense an aggregate of the first electrical current and the second electrical current; and
generate a fourth signal indicative of the aggregate.
6. The smart electrical plug of claim 5 , wherein the single current sensor is coupled to the L line.
7. The smart electrical plug of claim 5 , wherein the single current sensor is coupled to the N line.
8. The smart electrical plug of claim 1 , further comprising:
at least two universal serial bus (USB) charging sockets.
9. The smart electrical plug of claim 8 , wherein:
a combined maximum current rating of the first and second electrical output sockets is approximately 20 amperes; and
the smart electrical plug has maximum outside dimensions approximately equal to 149 mm (length) by 88 mm (width) by 30 mm (height).
10. The smart electrical plug of claim 9 , wherein:
a maximum single current rating of one of the first and second electrical output sockets is approximately 13 amperes.
11. The smart electrical plug of claim 1 , wherein the communication interface comprises a wireless interface.
12. The smart electrical plug of claim 1 , wherein the communication interface comprises a wired interface.
13. The smart electrical plug of claim 11 , wherein the communication signal is indicative of a status of the smart electrical plug.