Portable backup starting device for vehicle

A portable backup starting device for vehicle, comprising an internal power source, a switching circuit, a first voltage detecting circuit, a first electrode clip, a second electrode clip, and a second voltage detecting circuit, wherein

• the first electrode clip and the second electrode clip are configured to connect to a first end and a second end of a vehicle load;
• the internal power source has a first electrode and a second electrode, wherein the first electrode is coupled to the first electrode clip, and the second electrode is coupled to the switching circuit;
• the switching circuit is coupled to the second electrode clip;
• the first voltage detecting circuit is coupled to the switching circuit, the first electrode, and the second electrode is configured to detect a first voltage between the first electrode and the second electrode before the switching circuit conducts, wherein the switching circuit does not conduct in response to the first voltage meeting a first preset condition,
• the second voltage detecting circuit is coupled to the switching circuit, the first electrode clip, and the second electrode clip is configured to detect a second voltage between the first end and the second end before the switching circuit conducts, wherein the switching circuit does not conduct in response to the first voltage meeting the first preset condition or the second voltage meeting a second preset condition,
• the switching circuit comprises a first drive switch, a second drive switch, and a first switch, wherein the first drive switch is coupled to the first voltage detecting circuit and the first switch;
• the second drive switch is coupled to the second voltage detecting circuit and the first switch;
• and the first switch is coupled to the second electrode clip, and
• the first drive switch controls the first switch not to conduct in response to the first voltage meeting the first preset condition;
• the second drive switch controls the first switch not to conduct in response to the second voltage meeting the second preset condition;
• and the first switch does not conduct in response to the first voltage meeting the first preset condition or the second voltage meeting the second preset condition.