description:
The output voltage of the "POUT" terminal of the MAX1703 switching power supply is set to 3.4V, and the linear regulator consisting of the P-channel FET Q1 and the on-chip standby amplifier has an output voltage of 3.3V. Therefore, when the USB peripheral is powered by the battery pack, Q1 The power loss is almost negligible. When the external device is connected to the USB port, the diode D1 is forward biased to make the switching power supply "idle" state; that is, as long as the source voltage of Q1 is higher than 3.4V, the external device is always powered by the USB port. At the same time, the USB port also charges the battery pack through a constant current source composed of a PNP transistor Q2, etc., and the resistance value of the resistor R1 can be set to set the charging current to meet the requirements of the ten-hour charging system. Once the external device is disconnected from the USB port, the switching power supply immediately exits the "idle" state and continues to be powered by the internal battery pack.
Small UPS power circuit:
·Basic precautions
Do not put expensive oil into low-quality cartridges to avoid wastage. Most pre-filled oil cartridges have the so-called 510 thread. The oil cartridge screws onto a rechargeable battery. Some of these batteries have buttons and some heat up automatically when you pump the oil. Some batteries have multiple temperature settings and some heat up to a preset temperature; these features need to be known in advance.
·Cleaning notes
Use a suitable cleaning tool to clean them, such as activated charcoal or dried tea leaves in a used pipe to absorb the oil. It is important not to use alcohol or other boiling water to clean the pipe, and to wait until it has cooled down completely before cleaning. Otherwise, the hot stem will come into contact with the watery liquid and cause the mouthpiece tenon to loosen, thus shortening the life of the 510 cartridges.
This is what you should be aware of when using 510 cartridges. At the same time, when using 510 cartridges, there are still some vaping tips, for example, when using them, be careful not to suck too hard, will not produce smoke. When you inhale too hard, the smoke is sucked directly into your mouth and not atomized by the atomizer, so gently inhaling is more powerful and gives you a better vaping experience.
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