Detection circuit for on-board direct current/direct current (dc/dc) ground wire and on-board device

An on-board device, comprising:

• a detection circuit for an on-board direct current/direct current (DC/DC) ground wire, wherein the detection circuit for the on-board DC/DC ground wire includes a digital signal process (DSP) controller, a detection circuit, a standby circuit for an on-board DC/DC converter, and a power-supply negative wire for the on-board DC/DC converter, wherein:
• the DSP controller is connected with the detection circuit, the detection circuit is connected with the standby circuit for the on-board DC/DC converter and the power-supply negative wire for the on-board DC/DC converter respectively, and the detection circuit is further connected with an external input voltage;
• the detection circuit comprises a comparator, a first conductive branch, a second conductive branch, and a third conductive branch;
• and
• the comparator comprises a positive input end and a negative input end, wherein the positive input end is connected with the second conductive branch, and wherein the negative input end is connected with the first conductive branch.