Jump start circuit, jump starter and jump start device

A jump start circuit, configured to operably connect a starting power supply to a load battery, comprising:

• a first input terminal and a second input terminal, configured to electrically connect to a first electrode and a second electrode of the starting power supply, respectively;
• a first output and a second output, configured to electrically connect to a first electrode and a second electrode of the load battery, respectively;
• a switch module, electrically connected between the first input terminal and the first output, configured to operably connect the first input terminal to the first output;
• a voltage fluctuation detection module, electrically connected to at least one of the first input terminal, the first output and branches between the first input terminal and the first output at a connection point, the voltage fluctuation detection module being configured to detect an electric potential fluctuation at the connection point, when the detected electric potential fluctuation reaches a fluctuation threshold, the voltage fluctuation detection module outputs a starting identification signal;
• under a triggering of the starting identification signal, the switch module remains in an ON state;
• and
• an access detection module, configured to output a connection confirmation signal when detecting that the first output and the second output are correctly connected to the first electrode and the second electrode of the load battery respectively;
• when the connection confirmation signal is received and the electric potential fluctuation is detected to reach the fluctuation threshold, the voltage fluctuation detection module outputs the starting identification signal,
• wherein the voltage fluctuation detection module comprises a fluctuation detection unit and an access coupling unit electrically connected to the fluctuation detection unit;
• the fluctuation detection unit is electrically connected to at least one of the first input terminal and the first output;
• when the detected electric potential fluctuation reaches the fluctuation threshold, the fluctuation detection unit outputs an ignition detection signal to the access coupling unit;
• when the ignition detection signal and the connection confirmation signal are received, the access coupling unit outputs the starting identification signal;
• and
• wherein the fluctuation detection unit comprises a switch element Q11, a diode D4, a capacitor C23 and a fluctuation current limiting branch;
• an anode of the diode D4 is electrically connected to the first input terminal or the first output;
• the capacitor C23 is electrically connected between an cathode of the diode D4 and a ground;
• the cathode of the diode D4 is further electrically connected to one current-passing end of the switch element Q11;
• one end of the fluctuation current limiting branch is electrically connected to a control end of the switch element Q11, and an other end is electrically connected to the first input terminal or the first output;
• an other current-passing end of the switch element Q11 is configured to output the ignition detection signal to the access coupling unit.

A jump start circuit, configured to operably connect a starting power supply to a load battery, comprising:

• a first input terminal and a second input terminal, configured to electrically connect to a first electrode and a second electrode of the starting power supply, respectively;
• a first output and a second output, configured to electrically connect to a first electrode and a second electrode of the load battery, respectively;
• a switch module, electrically connected between the first input terminal and the first output, configured to operably connect the first input terminal to the first output;
• a voltage fluctuation detection module, electrically connected to at least one of the first input terminal, the first output and branches between the first input terminal and the first output at a connection point, the voltage fluctuation detection module being configured to detect an electric potential fluctuation at the connection point, when the detected electric potential fluctuation reaches a fluctuation threshold, the voltage fluctuation detection module outputs a starting identification signal;
• under a triggering of the starting identification signal, the switch module remains in an ON state;
• and
• an overload detection module;
• wherein the overload detection module is configured to electrically connected to the first input terminal and the second input terminal;
• the overload detection module is configured to detect an electric potential difference between the first input terminal and the second input terminal, and to output a stop signal when the electric potential difference between the first input terminal and the second input terminal is lower than a sixth voltage threshold;
• the switch module switches to the OFF state when receiving the stop signal,
• wherein the overload detection module comprises a second determining unit and an output unit;
• the second determining unit is configured to electrically connect to the first input terminal and the second input terminal;
• the second determining unit outputs a low-voltage identification signal when the electric potential difference between the first input terminal and the second input terminal is lower than the sixth voltage threshold;
• the output unit maintains the output of the stop signal after receiving the low-voltage identification signal;
• and
• wherein the output unit comprises a switch element Q21, a switch element Q20, a fourth current limiting branch, and a first feedback branch;
• wherein a control end of the switch element Q21 is electrically connected to an output end of the second determining unit, an current-passing end of the switch element Q21 is electrically connected to a control end of the switch element Q20, and an other current-passing end of the switch element Q21 is grounded;
• an current-passing end of the switch element Q20 is configured to input a reference voltage, and an other current-passing end of the switch element Q20 is configured to output the stop signal;
• the fourth current limiting branch is electrically connected between the current-passing end of the switch element Q20 and the control end of the switch element Q20;
• the first feedback branch is electrically connected between the other current-passing end of the switch element Q20 and the control end of the switch element Q21.