Patent ID: 7538450

Claim:
A power switch device for a cluster computer, comprising: a power input circuit, receiving a plurality of input powers, each having a power-on state or alternatively a power-off state, and a plurality of state signals, each corresponding to a respective one of the input powers; a first output circuit, supplying electricity to a head node and at least one compute node of the cluster computer; a second output circuit, supplying electricity to the head node; a gate, generating a switch signal according to the state signals; at least one switch module, being responsive to the switch signal, electrically connecting the power input circuit to the first output circuit if all of the plurality of input powers are in the power-on state, and to the second output circuit if at least one of the plurality of input powers is in the power-off state; and at least one spare power module, electrically connecting to the first output circuit and the second output circuit, the spare power module being charged through the first output circuit and storing a spare power, the spare power being provided to the second output circuit during a switch period of the switch module.