Patent ID: 6854813

Claim:
An electrically driven brake device comprising: a plurality of brake actuators to generate braking force when driven electrically; a power supply source to store electric energy and supply electric power to the brake actuators; power source lines to connect the power supply source and the brake actuators; a power breaker provided to selectably connect the power source lines, and to selectably disconnect the power source lines during times when the power supply source is unreliable, so as to insulate and separate the plurality of brake actuators into at least two systems; an auxiliary power supply source to store electric energy and supply electric power to brake actuators of one system of the at least two systems during the times when the power supply source is unreliable, wherein the power supply source and the auxiliary power supply source provide power at mutually different voltage levels; and a converter to convert a voltage level of the auxiliary power supply source to substantially a voltage level of the power supply source, and to apply a thus converted voltage level to the one system.