dicodes SBS18350Qi Посібник - Сторінка 16

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07 Wireless Charging

The SBS18350-Qi can be wireless charged using the provided small charger-pad.

Batteries of size 18350 have a comparably low capacity of about 1000mAh. When vaping throughout

the day the low capacity leads to a fast discharge and the requirement to replace the battery several times.

By means of the small charging pad the replacment of the battery becomes obsolete, when the mod is

always set onto the pad in between the vapes.

Connect the charger pad with the provided USB-C cable to a commercially available line adapter with a

current output of at least 1.5A.

As soon as the pad is supplied, the built in LED is blinking red/blue several times and then remains red.

To charge the SBS18350-Qi, place the device onto the small dip, which is just a little bigger than the

devices outline and thus helps to position it optimally for the wireless power transfer.

If the device is not positioned well, wireless charging will not be established.

As soon as the charger pad recognizes the SSB18350-Qi, the LEDs color will change from red to blue.

Shortly after that, the red LED inside the SBS18350-Qi, visible at the bottom edge of the display window

will light up. If the LED is not lit up, communication between charger pad and mod is present (blue LED

on pad), but the charging circuit inside the device encounters a problem with the battery.

The battery will be charged with a current of 0.5A up to almost 4.2V. When reaching 4.2V the charging

is changed from constant current to constant voltage (CC to CV). The charger circuit will provide that the

battery is not charged higher than 4.2V.

Remark referring t o the use of 18650 batteries:

If the battery was dicharged below about 3V, the charger circuit reduces the current to about 100mA,

which is called precharge phase. The precharge has a timer of 30 minutes. Having a high capacity 18650

battery, e.g. 3300mAh, and a discharge level of 2.8V or below, the 30 minutes will not suffice to charge

the battery above 3V. Removing and placing the device onto the pad will reset the timer.

When the SBS18350-Qi is on, the dispaly will shortly show "charging" and the battery voltage, when the

device is placed onto the pad. It will not show this message when it is off - either by active switch off or

the auto-power off timer. Charging will be perfomred nevertheless.

Wireless charging is not very effiecient compared to a wired connection.

The small efficiency will lead to a warming up of the device and the charger pad. When charging at 0.5A,

the device will warm up to up to 18°C above ambient temperature.

When the wall apater or source provides 5V, the current consumption for the wireless charging will be

at about 1A. When the battery is fully charged, this current goes down to about 250mA, which is the

required current to keep the communcation between pad and device.

The charger pad will also accept higher input voltages and is USB-C PD protocol compatible.

The SBS18350-Qi wirless charging is compatible to the Qi standard, as the name indicates. Most

commercially available Qi charging pads will NOT charge the device, because the transmit coil inside

those charging pads have a diameter of about 50mm or bigger. The bigger diameter will induce

eddy currents in the stainless steel housing of the SBS18350-Qi and not charge the battery inside the

device.