Patent ID: 9649939
Date: 2017-05-16
CPC Classifications: B60L

Claim:
1. A direct current power distribution system comprising: a low voltage direct current power source and an associated first low voltage bus for energization from the low voltage direct current power source; a high voltage direct current power source and an associated high voltage bus for energization from the high voltage direct current power source; a controller area network datalink; a plurality of nodes connected to the controller area network datalink for exchanging data and further connected to the low voltage bus for energization; an accessory relay responsive to a control input for connecting the first low voltage bus to the low voltage direct current power source; a high side isolation contactor and a low side isolation contactor, the high and low side isolation contactors being responsive to control signals applied to control inputs for connecting the high voltage bus to the high voltage direct current power source and the low side isolation contactor to opposite polarity terminals of the high voltage direct current power source; a supervisory sub-system for controlling energization of the low voltage bus and the high voltage bus by application of control signals to the control inputs of the accessory relay and to the low side and high side isolation contactors and further connected to the controller area network datalink for exchanging data with the plurality of nodes; and an external state select switch connected to the supervisory sub-system for requesting changes in state of the low voltage bus and the high voltage bus; a second low voltage bus for energization to at least the control signal level for the high and low side isolation contactors, the second low voltage bus being connected to the control input of the high side isolation contactor and energized from the low voltage direct current power source in response to closure of the high side isolation contactor.