Controllable brake unit, brake system and brake method

The invention discloses a controllable brake unit, a brake system and a brake method. The controllable brake unit comprises a brake unit and a controller, wherein the brake unit is connected with positive and negative poles of a DC bus of equipment; the controller comprises a control signal input end, a power semiconductor device driving signal output end and a brake unit working condition feedback signal end and realizes driving control through connection of a driving signal output end with a brake unit driving end. The brake system comprises a host controllable brake unit and at least one slave controllable brake unit, wherein the host unit is an A type or C type controller, and each slave unit is an A type or B type controller, brake units of the host and slave units are connected with the positive and negative poles of the DC bus respectively, and the host unit controls the at least one slave unit to act synchronously. The brake method comprises steps as follows: controlling the brake units to be the controllable brake units; setting the host unit and the at least one slave unit; enabling the host unit to control the at least one slave unit to act synchronously. The problem of dispersion of the brake units is solved, brake units connected in parallel act synchronously, and the failure rate of the brake units is decreased.