Equalization circuit, device to be charged and charging control method

A device to be charged, comprising:

• a plurality of battery cells coupled in series and comprising a first battery cell and a second battery cell;
• an equalization circuit coupled to the first battery cell and the second battery cell, wherein the equalization circuit comprises:
• a first converting unit, configured to receive a direct voltage output by the first battery cell and to convert the direct voltage output by the first battery cell into a first alternating voltage;
• a first resonant unit, configured to receive the first alternating voltage and to convert the first alternating voltage into a second alternating voltage in a resonant manner, wherein a magnitude of the second alternating voltage is greater than that of the first alternating voltage;
• a first capacitive coupling unit and a second converting unit, wherein the first capacitive coupling unit is configured to couple the second alternating voltage to the second converting unit in a capacitive coupling manner, and the second converting unit is configured to convert the second alternating voltage into a first charging voltage for charging the second battery cell;
• wherein the equalization circuit further comprises:
• a second resonant unit and a second capacitive coupling unit;
• wherein the second converting unit is further configured to receive a direct voltage output by the second battery cell and to convert the direct voltage output by the second battery cell into a third alternating voltage;
• wherein the second resonant unit is configured to receive the third alternating voltage and to convert the third alternating voltage into a fourth alternating voltage in a resonant manner, wherein a magnitude of the fourth alternating voltage is greater than that of the third alternating voltage;
• and
• wherein the second capacitive coupling unit is configured to couple the fourth alternating voltage to the first converting unit in a capacitive coupling manner, and the first converting unit is further configured to convert the fourth alternating voltage into a second charging voltage for charging the first battery cell.

A charging control method, applied for a device to be charged including a first battery cell and a second battery cell coupled in series, comprising:

• receiving a direct voltage output by the first battery cell and converting the direct voltage output by the first battery cell into a first alternating voltage;
• receiving the first alternating voltage and converting the first alternating voltage into a second alternating voltage in a resonant manner, wherein a magnitude of the second alternating voltage is greater than that of the first alternating voltage;
• and
• coupling the second alternating voltage to a second converting unit in a capacitive coupling manner, such that the second converting unit converts the second alternating voltage into a first charging voltage for charging the second battery cell;
• receiving a direct voltage output by the second battery cell and converting the direct voltage output by the second battery cell into a third alternating voltage;
• receiving the third alternating voltage and converting the third alternating voltage into a fourth alternating voltage in a resonant manner, wherein a magnitude of the fourth alternating voltage is greater than that of the third alternating voltage;
• and
• coupling the fourth alternating voltage to a first converting unit in a capacitive coupling manner, such that the first converting unit converts the fourth alternating voltage into a second charging voltage for charging the first battery cell.