Electric vehicle and voltage acquisition circuit thereof

An electric vehicle (10), comprising:

• a battery pack (100) comprising a positive terminal and a negative terminal;
• a voltage acquisition circuit (200) comprising:
• a voltage division and sampling module (210) comprising:
• a first voltage division unit (220) and a second voltage division unit (230);
• a sampling unit (250) comprising a first terminal electrically coupled to the positive terminal of the battery pack (100) through the first voltage division unit (220), and a second terminal electrically coupled to the negative terminal of the battery pack (100) through the second voltage division unit (230);
• and
• a comparison unit (260) comprising a first input terminal electrically coupled to the first terminal of the sampling unit (250), a second input terminal electrically coupled to the second terminal of the sampling unit (250), and an output terminal;
• a voltage to frequency conversion module (270) electrically coupled to the output terminal of the comparison unit (260), to receive a voltage signal (Vout) from the comparison unit (260), the voltage to frequency conversion module (270) configured to convert the voltage signal (Vout) into a first frequency signal (F1);
• and
• an isolation module (280) electrically coupled to the voltage to frequency conversion module (270), to receive the first frequency signal (F1), the isolation module (280) configured to electrically isolate the first frequency signal (F1), to generate a second frequency signal (F2);
• and
• a battery management system (BMS) (300) electrically coupled to the isolation module (280), to receive the second frequency signal (F2), the BMS (300) configured to manage the battery pack (100), according to the second frequency signal (F2).