| 摘要 |
A USB charger for electronic cigarettes, comprising a USB interface configured for connecting with a power supply and a load end configured for connecting with a load, wherein, the USB charger for electronic cigarettes further comprises a voltage comparison unit, a benchmark circuit, a sampling circuit, a current detecting element, a state indicating unit, and a low voltage difference linear regulator connected between the USB interface and the load end; the benchmark circuit is connected between an input end of the low voltage difference linear regulator and an input end of the voltage comparison unit; and the state indicating unit is connected with an output end of the voltage comparison unit; the USB charger for electronic cigarettes of the present invention achieves advantages effects of being safer and improving users' experiences. |
| 主权项 |
1. A USB charger for electronic cigarettes, comprising a USB interface configured for connecting with a power supply and a load end configured for connecting with a load, wherein, the USB charger for electronic cigarettes further comprises a voltage comparison unit, a benchmark circuit, a sampling circuit, a current detecting element, a state indicating unit, and a low voltage difference linear regulator connected between the USB interface and the load end; the benchmark circuit is connected between an input end of the low voltage difference linear regulator and an input end of the voltage comparison unit; and the state indicating unit is connected with an output end of the voltage comparison unit;
wherein, the low voltage difference linear regulator receives power via the USB interface and charges the load, and is further configured to provide over-current protection, short-circuit protection, and over-temperature protection in real time in the charging process; the current detecting element is configured for detecting the charging current, and forms a voltage thereon; the sampling circuit is configured for acquiring a node voltage between the load end and the current detecting element, and generates a comparison voltage at the input end of the comparison unit according to the node voltage; the benchmark circuit is configured to generate a benchmark voltage, and transmits the benchmark voltage to the voltage comparison unit; the voltage comparison unit is configured to compare the comparison voltage with the benchmark voltage, determine a charging state of the USB charger for electronic cigarettes, and control the state indicating unit to indicate the charging state according to the charging state. |
