Gate driving circuit applied to motor inverter and gate driving method

A gate driving method, comprising:

• enabling a lower arm power switch;
• when the lower arm power switch is turned on, turning on a lower arm charging switch by an independent power supply via the lower arm power switch;
• when the lower arm charging switch is turned on, a first charging path being formed to charge a lower arm bootstrap capacitor by the independent power supply, wherein the first charging path comprises the lower arm bootstrap capacitor and the lower arm charging switch;
• enabling a lower arm insulated switch according to the potential of the lower arm bootstrap capacitor;
• when the lower arm insulated switch is turned on, the independent power supply, an upper arm pre-charging capacitor and the lower arm insulated switch forming a pre-charging path, to charge the upper arm pre-charging capacitor by the independent power supply;
• after the step of enabling the lower arm insulated switch, disabling the lower arm power switch and enabling an upper arm power switch;
• when the upper arm power switch is turned on, the upper arm pre-charging capacitor, an upper arm bootstrap capacitor and the upper arm power switch forming a second charging path, to charge the upper arm bootstrap capacitor;
• and
• enabling an upper arm insulated switch according to the potential of the upper arm bootstrap capacitor.