Electrical overload protection device based on charge injection and charge discharging

The utility model relates to an electrical overload protection device and method based on charge injection and charge discharging. An electrical overload protection circuit is at least partially used to inhibit or compensate an undershoot and an overshoot in a first signal and a second signal transmitted by adopting a differential signal transmission method (such as, adopting USB communication). With regard to the undershoot, the electrical overload protection circuit can be used to inject the charge in a pad used to receive the first signal and the second signal. With regard to the overshoot, the electrical overload protection circuit can be used to receive the charge discharged from the pad used to receive the second signal, and can be used to inject the charge in the pad used to receive the first signal.