Detection Circuit, Anti-Backflow System, and Charging Pile

A system, comprising:

• an anti-backflow circuit comprising:
• a high-electric-potential input end;
• and
• a high-electric-potential output end;
• and
• a detection circuit configured to perform failure detection on the anti-backflow circuit and comprising:
• a first end configured to be connected to the high-electric-potential input end;
• a second end configured to be connected to the high-electric-potential output end;
• a detection power supply connected to the first end;
• a digital component connected to the second end;
• and
• a detection power supply connected to the first end and the digital component, wherein the detection power supply and the digital component are connected in series between the first end and the second end, and wherein the detection power supply is configured to:
• apply bias voltages to the first end and the second end to make a first electric potential at the second end higher than a second electric potential at the first end;
• transmit a detection current between the first end and the second end when a current loop is formed between the first end and the second end;
• and
• output a first level signal when transmitting the detection current,
• wherein the first level signal indicates that the anti-backflow circuit has failed.

An apparatus, comprising:

• a conversion circuit configured to:
• receive alternating current electric power;
• convert the alternating current electric power into direct current electric power;
• and
• output the direct current electric power;
• and
• an anti-backflow system configured to:
• receive the direct current electric power from the conversion circuit;
• and
• output the direct current electric power to a battery,
• wherein the anti-backflow system comprises:
• an anti-backflow circuit comprising:
• a high-electric-potential input end;
• and
• a high-electric-potential output end;
• and
• a detection circuit configured to perform failure detection on the anti-backflow circuit and comprising:
• a first end configured to be connected to the high-electric-potential input end;
• a second end configured to be connected to the high-electric-potential output end;
• a detection power supply connected to the first end;
• a digital component connected to the second end,
• a detection power supply connected to the first end and the digital component, wherein the detection power supply and the digital component are connected in series between the first end and the second end, and wherein the detection power supply is configured to:
• apply bias voltages to the first end and the second end to make a first electric potential at the second end higher than a second electric potential at the first end;
• transmit a detection current between the first end and the second end when a current loop is formed between the first end and the second end;
• and
• output a first level signal when transmitting the detection current,
• wherein the first level signal indicates that the anti-backflow circuit has failed.