| 主权项 |
1. A USB charger for an electronic cigarette, which comprises a first interface, a control module and a second interface, wherein the USB charger further comprises a built-in battery, the control module is connected to the first interface, the second interface and the built-in battery respectively; the first interface is configured to connect an external power source so as to provide a power supply; the second interface is configured to connect a battery rod of an external electronic cigarette; the control module is configured to charge the battery rod of the electronic cigarette and the built-in battery simultaneously by using the external power source, or control the built-in battery to charge the battery rod of the electronic cigarette, based on the access state of the external power source at the first interface; wherein the control module comprises a voltage boost control circuit and a diode the voltage boost control circuit is connected to the second interface, the anode of the diode (D1) is connected to the first interface, the cathode of the diode (D1) is connected to the voltage boost control circuit, the diode (D1) is configured to prevent the current from streaming backward when the external power source is charging the battery rod of the electronic cigarette wherein the voltage boost control circuit comprises a voltage boost chip, a resistor (R2), an inductor (L2), a capacitor (C2) and a diode (D3): a port (SW) of the voltage boost chip is electronically connected to the anode of the diode (D3), and is further electronically connected to one end of the capacitor (C2) and the second interface via the diode (D3): the resistor (R2) and the inductor (L2) are connected in series sequentially between a voltage input port of the voltage boost chip and the anode of the diode (D3). |
