Power-supply management apparatus

Abstract

A power-supply management apparatus is provided, including using a battery 15 as a drive power, a external signal-detecting circuit 16 for detecting input external signals to an input terminal 11; a constant current source circuit 18 which is activated according to output of detecting circuit and which self-holds an operation state; a main power-supply circuit 20 which operates to output a voltage lower than that of the battery 15 which changes into operation stateupon receiving a current from the constant-current-source circuit; a reset circuit 22 which turns off the constant-current-source circuit upon receiving a reset signal. When input reproduce signal from alert to reset state, automaticly changing into operating by using the battery start the main power, without need for generating backup power to realize lower power consumption.

Description

technical field [0001] The present invention relates to a power management device, in particular to a device that utilizes batteries, accumulators, etc. to generate and use main power, such as a locking / unlocking device for a car door. Background technique [0002] In equipment that uses batteries, accumulators, etc. to generate main power and backup power, turn off the main power while waiting to reduce the consumption of the accumulator. As far as the existing equipment is concerned, when waiting, the recovery signal detection circuit that detects the signal for recovery from the standby state, the control circuit for starting the main power supply, and the backup power supply (generated by the storage battery) for the circuit Work. Therefore, it is impossible to make the current consumption during standby equal to zero, and the current consumption of the storage battery continues to occur. [0003] Hereinafter, as such a power management device, for example, an automobi...

AI Technical Summary

Problems solved by technology

[0005] At this time, the engine is stopped, and the motor for unlocking the door is started without the battery being supplied with current from the generator, so the consumption of the battery is accelerated.

And, because even several indications come from the waiting state to the recovery signal arrival, it can be detected, often, or periodically, the power supply from the backup power supply to the recovery signal detection circuit or the door unlocking motor control circuit is turned ON. The current consumption of the battery has been occurring

[0006] Recently, due to the spread of LAN (Local Area Network) in cars, the current consumption of batteries has further increased, which may become a problem.

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