On/off control device for power source unit
AssigneeNEC Corporation
InventorHirotsugu Matsuyama
Life of this patent
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Abstract
A voltage detection circuit 2 detects a voltage of a battery 1 and, when the voltage thus detected is within a tolerable input voltage of a power source unit 5, an on/off signal transmitter circuit 4 allows an on/off signal generator circuit 3 to transmit an on/off signal S2 to the power source unit 5. When the voltage of the battery 1 becomes lower than a lower limit of the tolerable input voltage range of the power source unit 5 due to increase of a power consumption of a load 6 thereof, the on/off signal transmitter circuit 4 transmits an off signal S3 to the power source unit 5 regardless of the on/off signal S2 from the on/off signal generator circuit 3. Thus, it is possible to prevent an erroneous operation of the load due to abnormal operation of the power source unit.
Claims1
A power supply system for supplying a battery voltage to a plurality of loads, comprising:
- an on/off signal generator circuit for generating an on/off signal;
- a plurality of power source units each supplying the battery voltage to an associated one of the plurality of loads in response to the on/off signal, each of the plurality of loads being associated with a single one of the plurality of power source units;
- a plurality of voltage detection circuits, each associated with one of the power source units, each voltage detection circuit supplying a voltage detection signal indicating whether the battery voltage is within an input voltage range of an associated one of the plurality of power source units;
- and
- a plurality of on/off signal transmitter circuits, each associated with one of the power source units, each on/off signal transmitter circuit selectively passing the on/off signal to an associated one of the plurality of power source units in response to a voltage detection signal from a voltage detection circuit associated with the associated one of the plurality of power source unit.
Dependencies are inferred from the claim text.