ELECTRONIC CIGARETTE, AND POWER SUPPLY STRUCTURE THEREOF
FIG2 is a block diagram of a power supply structure according to another embodiment  FIG1 is a block diagram of a power supply structure according to an embodiment
In one embodiment, as shown in FIG2, the charging circuit 10 includes a charging interface 100, a boosting module 110, and a buck module 120. The charging interface 100 is connected to the battery pack 20 selectively through the boosting module 110 and the buck module 120, and the charging interface 100 is used to access an external power source to obtain a standard charging voltage. In one embodiment, the boosting module 110 and the buck module 120 may correspond to multiple batteries and a single battery, respectively. Specifically, assuming that the standard charging voltage is 5V and the standard voltage of one rechargeable battery is 4.2V, then when there is only one rechargeable battery in the circuit (the battery pack 20 has only one rechargeable battery) for charging, the buck module 120 is connected to the battery pack 20 for charging the battery; and when there are multiple rechargeable batteries in the circuit (the battery pack 20 includes a plurality of rechargeable batteries) for charging, the boosting module 110 is connected to the battery pack 20 for charging the multiple batteries.  As shown in FIG1, it is a block diagram of a power supply structure according to an embodiment. The power supply structure includes a charging circuit 10, a battery pack 20 including at least two rechargeable batteries, and a switching circuit 30.
block diagram
30
switching circuit
100
charging interface
20
battery pack
10
charging circuit
110
boosting module
120
module
['1. A power supply structure, comprising at least two rechargeable batteries connected in series and a charging circuit (10) connected to the rechargeable batteries for charging the rechargeable batteries, the rechargeable batteries comprising a 1 st  rechargeable battery and a 2 nd  rechargeable battery; characterized in that  the power supply structure further comprises a switching circuit (30) connected to the rechargeable batteries, the switching circuit (30) comprises a first mechanical switch (K5) connected in parallel with two ends of the 1 st  rechargeable battery and a second mechanical switch (K6) connected in parallel with two ends of the 2 nd  rechargeable battery, the first mechanical switch (K5) and the second mechanical switch (K6) are configured for regulating the number of the rechargeable batteries connected in series to form different battery series circuits; the charging circuit (10) comprises a charging interface (100), a boosting module (110) and a buck module (120), the charging interface (100) is configured for accessing an external power source to obtain a standard charging voltage, the charging interface (100) is respectively connected to the battery series circuits through the boosting module (110) and the buck module (120); the charging circuit (10) further comprises a controller (130) and a voltage sampling module (140), the controller (130) is respectively connected to the boosting module (110) and the buck module (120), the voltage sampling module (140) is connected between the controller (130) and the battery series circuits and configured for detecting the voltages of the battery series circuits and feeding the detected voltages back to the controller (130), so that according to the detected voltages, the controller (130) controls the boosting module (110) or the buck module (120) to operate for converting the standard charging voltage into different charging voltages to be supplied to the battery series circuits for charging.']