High-voltage sampling circuit and battery management system

A high-voltage sampling circuit, wherein the high-voltage sampling circuit comprises a resistor voltage-dividing unit, a switch unit, and a voltage sampling unit, two ends of the resistor voltage-dividing unit are respectively connected to two ends of a high-voltage busbar, and an output end of the resistor voltage-dividing unit is connected to the voltage sampling unit through the switch unit;

• wherein
• the resistor voltage-dividing unit is configured to divide a busbar voltage across the two ends of the high-voltage busbar to generate a first voltage signal;
• and
• the voltage sampling unit comprises an energy storage component and an isolation component, and is configured to:
• when the switch unit is in a first state, store energy to the energy storage component based on the first voltage signal;
• and when the switch unit is in a second state, convert energy stored in the energy storage component into a second voltage signal, and output the second voltage signal as a third voltage signal through the isolation component.