Wave GaN Charger

Details

A gallium nitride charger with folding pins, sized for an Indian socket that already has three other things in it. It runs on 100 to 240 V, and it gives its full rated speed to any device that follows USB Power Delivery, ours or not. The cheat in a multi-port charger is the headline number. 100 W is printed on the case, and 100 W is what one port gives when nothing else is plugged in. Put a second device on and the first drops, usually to 65 W, and the box does not say so. The second cheat is the cable: a 100 W charger shipped with a 3 A cable delivers 60 W for ever, and nobody has technically lied. The third is thermal, where a charger holds its rating for four minutes on a bench at 22 C and quietly halves it in a Chennai May. So the sharing table is on the page, the cable question is answered, and the thermal figure carries its ambient.

• Every port rated alone AND in combination. On the 65 W: 65 W on C1 alone; with C2 in use it is 45 W plus 20 W. On the 100 W: 100 W on C1 alone; 65 W plus 30 W across the two C ports; 45 W plus 30 W plus 12 W with the A port as well
• The 100 W on a single port is 20 V at 5 A and needs a 5 A e-marked cable. With an ordinary 3 A cable it will give 60 W, which is correct behaviour and not a fault
• No cable is in the box, and that is deliberate. A 100 W charger packed with a 60 W cable is how a 100 W charger becomes a 60 W charger without anybody lying
• USB Power Delivery 3.1 with Programmable Power Supply. No proprietary fast-charge handshake, so another maker phone charges at full rated speed
• Holds rated output for two hours at 40 degrees C ambient, with the case measured at 62 degrees. Two hours and 40 degrees, because a thermal figure without both is not a figure
• Efficiency 94 percent at half load on the 65 W and 100 W, 92 percent on the 30 W. At full load the 100 W draws about 106 W and sheds 6.4 W as heat, which is why it weighs 168 g and not 96 g. No-load draw under 0.075 W
• Protection: over-voltage, over-current, short circuit, over-temperature with cutback at a 90 degree C case, under-voltage lockout, and surge to 2 kV line to line per IEC 61000-4-5. A 130 degree C thermal fuse sits in the primary
• Class II, double insulated, 3,000 V AC primary to secondary hipot. The plug is a folding Indian three pin to IS 1293, 6 A, and because this is Class II the earth pin is a moulded shutter opener rather than a conductor. Said plainly, because a two-pin device pretending otherwise is the thing this shelf exists against
• GaN HEMT primary switch running to 400 kHz, which is what makes the 65 W unit 96 g rather than a brick
• The price ladder is about Rs 29 per additional watt: Rs 1,290 for 30 W, Rs 2,290 for 65 W, Rs 3,290 for 100 W
• The honest trade is that GaN runs hot in a small shell. A charger under a pillow or inside a bag will hit the 90 degree cutback and reduce output. That is the protection doing its job, not a defect
• There is no Shuunnya service-centre network. A warranty claim means posting the charger to us, with no turnaround time promised