Abstract: A switch circuit, a mixer, and an electronic device, where the switch circuit includes a first metal oxide semiconductor (MOS) transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor, both a gate of the first MOS transistor and a gate of the fourth MOS transistor are connected to a first port, and both a gate of the second MOS transistor and a gate of the third MOS transistor are connected to a second port; and a lead between the gate of the first MOS transistor and the first port, a lead between the gate of the second MOS transistor and the second port, a lead between the gate of the third MOS transistor and the second port, and a lead between the gate of the fourth MOS transistor and the first port all have an equal length. In this way, linearity is relatively high.

Abstract: A charging system includes a plurality of mobile power supplies, a plurality of charging units, and a control device. The charging unit includes a fixing device and a charging device, the fixing device being changeable between a locked state where one of the mobile power supplies can be locked in the charging unit by the fixing device and an unlocked state where the one of the mobile power supplies is unlocked from the charging unit. The charging device is configured to charge the mobile power supply fixed in the charging unit. The control device is connected to the charging units, the control device is configured to receive a charging request from a user and generate an unlock command in response to the charging request to control at least one of the fixing devices to switch to the unlocked state.

Abstract: The present disclosure includes a protective sleeve assembly and a battery module, wherein the protective sleeve assembly includes a frame and a terminal fixing plate, a terminal circuit board and a connector port are arranged on the terminal fixing plate, an end of a conduction sheet is connected to the terminal circuit board, the other end of the conduction sheet is in a limiting hole of the terminal fixing plate; the battery module includes a upper cover, a lower cover and a charge-discharge control circuit board, a conduction electrode is arranged on the charge-discharge control circuit board and connected with a battery. When the mobile phone is fixed with the protective sleeve assembly, a special port of the mobile phone is transformed into a general port by the conversion circuit of the terminal circuit board, so it's easy to charge the mobile phone by the general port.

Abstract: The present disclosure includes a protective sleeve assembly and a battery module, wherein the protective sleeve assembly includes a frame and a terminal fixing plate, a terminal circuit board and a connector port are arranged on the terminal fixing plate, an end of a conduction sheet is connected to the terminal circuit board, the other end of the conduction sheet is in a limiting hole of the terminal fixing plate; the battery module includes a upper cover, a lower cover and a charge-discharge control circuit board, a conduction electrode is arranged on the charge-discharge control circuit board and connected with a battery. When the mobile phone is fixed with the protective sleeve assembly, a special port of the mobile phone is transformed into a general port by the conversion circuit of the terminal circuit board, so it's easy to charge the mobile phone by the general port.