Storage-battery control system
In a storage-battery control system, an insulating communication unit couples a controller to a battery module constituting a storage battery unit that outputs a predetermined high voltage value. A power supply line is further provided for supplying electric power output from a controller DC/DC, i.e., a controller-side voltage converter for the controller, to the battery module, so that electric power is collectively supplied via the power supply line to a module CPU and a module-side insulating circuit both consuming electric power in the battery module. A secondary battery in the battery module supplies electric power to only a cell-voltage detector.
1. A storage-battery control system comprising:
a battery module constituting a storage battery unit configured to output a predetermined high voltage value;
a controller;
an insulating communication unit configured to couple the battery module and the controller; and
a power supply line,
wherein the battery module includes a secondary battery for outputting a module voltage value, a module-side voltage converter for converting a voltage value of the secondary battery into a module-side predetermined operation voltage value, and a module-side circuit element that operates at the module-side predetermined operation voltage value,
the controller includes a low voltage power supply unit, a controller-side voltage converter for converting a voltage of the low voltage power supply unit into a controller-side predetermined operation voltage value, and a controller-side insulating circuit having a floating reference potential point insulated from a controller reference potential point for the low voltage power supply unit to couple the controller and the insulating communication unit,
the power supply line supplies electric power output from the controller-side voltage converter to the battery module,
an output side of the module-side voltage converter and an output side of the controller-side voltage converter are coupled to each other via a predetermined backflow preventing device, and the module-side circuit element that operates at the module-side predetermined operation voltage value is supplied with electric power from a coupling point, and
the predetermined backflow preventing device includes a module-side rectifying device having an anode coupled to the output side of the module-side voltage converter and a cathode coupled to the coupling point, and a controller-side rectifying device having an anode coupled to the output side of the controller-side voltage converter and a cathode coupled to the coupling point.
2. The storage-battery control system according to claim 1 , wherein the storage battery unit includes a plurality of the battery modules coupled to each other in series, and the electric power output from the controller-side voltage converter is supplied to each of the plurality of battery modules.