Electrically isolated heat dissipating junction box
A junction box used for making electrical connections to a photovoltaic panel. The junction box has two chambers including a first chamber and a second chamber and a wall common to and separating both chambers. The wall may be adapted to have an electrical connection therethrough. The two lids are adapted to seal respectively the two chambers. The two lids are on opposite sides of the junction box relative to the photovoltaic panel. The two lids may be attachable using different sealing processes to a different level of hermeticity. The first chamber may be adapted to receive a circuit board for electrical power conversion. The junction box may include supports for mounting a printed circuit board in the first chamber. The second chamber is configured for electrical connection to the photovoltaic panel. A metal heat sink may be bonded inside the first chamber.
1. A junction box comprising:
a first chamber;
a second chamber;
a first lid configured to cover the first chamber; and
a shield bonded to the first lid, the shield comprising an electrically conductive shielding,
wherein the shield connects electrically to a heat sink to form a Faraday cage, the Faraday cage configured to suppress Radio Frequency Interference (RFI) emission from the junction box.
2. The junction box according to claim 1 , further comprising a wall separating the first chamber and the second chamber.
3. The junction box according to claim 1 , wherein the shield is bonded to the first lid during an injection molding process.
4. The junction box according to claim 1 , wherein the first chamber houses a circuit board.
5. The junction box according to claim 1 , wherein the first chamber comprises a thermally conductive pad.
6. The junction box according to claim 5 , wherein the thermally conductive pad is electrically isolating.
7. The junction box according to claim 1 , wherein the first lid is coated in an electrically conductive shielding.
8. The junction box according to claim 7 , wherein the electrically conductive shielding suppresses RFI emission.
9. The junction box according to claim 1 , wherein the first chamber comprises at least a portion of the heat sink.
10. The junction box according to claim 1 , wherein the first chamber comprises an outer casing.
11. The junction box according to claim 1 , wherein the junction box is configured to be mounted on a non-photovoltaic side of a photovoltaic panel.
12. The junction box according to claim 1 , wherein the junction box is manufactured by injection molding.
13. The junction box according to claim 1 , wherein the first lid is manufactured by injection molding.
14. The junction box according to claim 1 , wherein either one or both of the junction box and the first lid are manufactured of any one of: acrylonitrile butadiene styrene (ABS) thermoplastic, Polybutylene terephthalate (PBT), Poly(p-phenylene oxide) (PPO) or a thermoset.
15. The junction box according to claim 1 , wherein the junction box, the first lid, and the heat sink, are compliant with the IEC 61215 (second edition) standard.
16. The junction box according to claim 1 , further comprising a second lid configured to cover the second chamber.
17. The junction box according to claim 16 , wherein the first lid and the second lid are disposed on opposite sides of the junction box.
18. The junction box according to claim 16 , wherein the first lid and the second lid are attached to the junction box using a different sealing processes configured to create a different level of hermeticity in the first chamber and in the second chamber.
19. The junction box according to claim 1 , wherein the second chamber comprises a bypass diode.
20. The junction box according to claim 1 , wherein the second chamber comprises a blocking diode.