Power supply apparatus and method for electro-mechanical brake system

A power supply method for an electronic mechanical brake system, the method comprising:

• determining whether an abnormality has occurred in any one of a first power line configured to supply power to a main controller and a left front wheel controller from a power branch point starting from a DC-DC converter that converts a voltage value of a direct current power source supplied from a high voltage battery in a power supply unit of a vehicle, a second power line configured to supply power to an auxiliary controller and a right front wheel controller from the power branch point, and a third power line configured to supply power to a left rear wheel controller and a right rear wheel controller from the power branch point;
• when it is determined that an abnormality has occurred in any one of the first power line, the second power line, and the third power line, supplying power to part of the main controller, the auxiliary controller, the left front wheel controller, the right front wheel controller, the left rear wheel controller, and the right rear wheel controller of the vehicle using at least one or more of the first, second and third power lines that have not failed, and determining an emergency braking command required for the vehicle;
• and
• generating, according to the emergency braking command, an emergency braking force of the vehicle by using part of the electronic mechanical brakes that are supplied with power and respectively connected to the left front wheel controller, the right front wheel controller, the left rear wheel controller, and the right rear wheel controller to satisfy a minimum required deceleration determined based on a front and rear wheel braking distribution ratio of the vehicle.