Power-off braking system for electric wheelchair

The utility model discloses a power-off braking system for an electric wheelchair. The power-off braking system comprises a controller, a power-off detection circuit, a feedback power supply circuit, a DC/DC step-down circuit, an upper bridge braking circuit and a lower bridge braking circuit, the controller is electrically connected with the power-off detection circuit, the feedback power supply circuit, the upper bridge braking circuit and the lower bridge braking circuit. According to the power-off braking system for the electric wheelchair, the power-off detection circuit can be used for monitoring whether power supply of the battery pack is cut off in real time, so that feedback power supply is performed by the feedback power supply circuit and the DC/DC step-down circuit in time when power supply is cut off, and power generated by the transmission wheel motor is supplied to the power-off braking system; furthermore, the upper bridge braking circuit and the lower bridge braking circuit are used for perfo