Docking charing circuit and electronic device

A docking charging circuit, comprising a power supply side module and a receiving side module that may be docked with each other, the power supply side module comprising a power source, a voltage output terminal connected to the power source and a first ground terminal, the receiving side module comprising a battery power supply unit and a voltage input terminal connected to the battery power supply unit;

• wherein the power supply side module further comprises a power supply side drive unit, a power generating unit, a first switch unit and a first intermediate terminal, and the receiving side module further comprises a second intermediate terminal, a second ground terminal, a first resistance circuit and a second resistance circuit;
• the power generating unit is connected between the first intermediate terminal and the power source, so as to output a target current to the first intermediate terminal under a power supply of the power source;
• the second intermediate terminal is connected to a first terminal of the first resistance circuit, and a second terminal of the first resistance circuit is grounded together with the second ground terminal;
• when the voltage output terminal is docked with the voltage input terminal and the first ground terminal is docked with the second ground terminal, the power generating unit, the first intermediate terminal, the second intermediate terminal, and the first resistance circuit are connected to the ground in sequence to form a first loop;
• and
• the first switch unit is connected between the power source and the voltage output terminal, a sampling terminal of the power supply side drive unit is connected to the first intermediate terminal, and an output terminal of the power supply side drive unit is connected to the first switch unit;
• the power supply side drive unit is configured to control an on-off of the first switch unit according to a voltage of the first intermediate terminal to control the first switch unit to be turned on when the first loop is formed and to control the first switch unit to be turned off under at least a part of a circuit state where the first loop is not formed.