Charging and power supplying circuit, method and application device

A charging and power supplying circuit, comprising:

• a power supplying tributary and a charging tributary, wherein an end of the power supplying tributary is connected to a power supply, and another end is connected to a system;
• an end of the charging tributary is connected to the power supply, and another end is connected to a battery;
• a first transistor is connected to the power supplying tributary, and a source and a drain of the first transistor are connected to the power supplying tributary, and a gate of the first transistor is connected to a line selection end of a logical switch;
• a second transistor is connected to the charging tributary, and a source and a drain of the second transistor are connected to the charging tributary, and a gate of the second transistor is connected to an output end of a charging controller;
• a source and a drain of a third transistor are connected to the battery and the system respectively, and a gate of the third transistor is connected to a first control module;
• two signal input ends of the logical switch are connected to an output end of a first comparator and an output end of a second comparator respectively, a first line selection end of the logical switch is connected to an output end of a first amplifier, and a second line selection end is connected to a switch-on control end;
• three input ends of the charging controller are connected to an output end of a second amplifier, an output end of a third amplifier and an output end of a fourth amplifier respectively;
• the charging and power supplying circuit further comprises an adder;
• a voltage of the power supplying tributary is input to a first input end of the adder, a voltage of the charging tributary is input to a second input end, and an output of the adder is a sum of the voltage of the power supplying tributary and the voltage of the charging tributary;
• a first preset level is input to an anode of an input end of the first amplifier, and a cathode of the input end of the first amplifier is connected to the output end of the adder and the sum of the voltage of the power supplying tributary and the voltage of the charging tributary is input to the cathode;
• a second preset level is input to an anode of an input end of the second amplifier, and a cathode of the input end of the second amplifier is connected to the output end of the adder and the sum of the voltage of the power supplying tributary and the voltage of the charging tributary is input to the cathode;
• the voltage of the charging tributary is input to a cathode of an input end of the third amplifier, and a third preset level is input to an anode of the input end of the third amplifier;
• a component voltage of the battery is input to a cathode of an input end of the fourth amplifier, and a fourth preset level is input to an anode of the input end of the fourth amplifier;
• an anode of an input end of the first comparator is connected to the output end of the adder and the sum of the voltage of the power supplying tributary and the voltage of the charging tributary is input to the anode, and a fifth preset level is input to a cathode of the input end of the first comparator;
• and
• a sixth preset level is input to an anode of an input end of the second comparator, and a cathode of the input end of the second comparator is connected to the second input end of the adder and the voltage of the charging tributary is input to the cathode.