Power-failure control device

Abstract

The invention provides a power-failure control device. A system voltage detection control unit and an AC detection control unit are used for respectively detecting a battery voltage value and a mainssupply voltage value, no power failure is generated as long as the battery voltage value reaches a power-on threshold and a mains supply comes, and power can be failure only when a battery voltage iscontinuously reduced to a power-failure threshold as long as a condition is no confirmed, i.e., the mains supply is stopped or the battery voltage is lower than the power-on threshold; and after power-failure action, the power-failure action is locked, at the moment, the power-failure state still can be maintained even the battery voltage is raised to the power-on threshold, and power can be connected as long as the mains supply comes and the battery voltage is not lower than the power-on threshold. Therefore, the problems that a traditional battery is powered on due to voltage rising caused by load reduction after power failure, the load of the battery is increased and the battery voltage is reduced after the battery is powered on and power is failure when the battery voltage is lower than the power-failure threshold to cause damage to a circuit system by repeated and frequent power connection and power failure are prevented.

Description

technical field [0001] The present invention relates to the technical field of electronic control, and more specifically, to a power-off control device. Background technique [0002] The communication power supply is the heart of the communication system. Once the power supply fails, it must be dealt with in time and restored in time to effectively ensure the normal operation of communication equipment such as transmission. At the same time, the quality of the battery as a backup power supply also largely determines reliability of the power system operation. During the operation of the system, the following situations often occur: [0003] (1) The switching power supply system is operating normally, the rectifier is working normally, and the output DC voltage is normal, but the power supply of the load equipment is not normal. This phenomenon is a problem with the switching power supply monitoring power-off control logic. [0004] (2) After a power-off (or a second power-o...

AI Technical Summary

Problems solved by technology

[0003] (1) The switching power supply system is running normally, the rectifier is working normally, and the output DC voltage is normal, but the power supply of the load equipment is not normal. This phenomenon is a problem with the power control logic of the switching power supply monitoring.

[0004] (2) After a power-off (or a second power-off), the power-off contactor often switches back and forth, that is, switching back and forth between the power-off state and the power-on state, which causes the load to start and stop continuously, which is easy Damage to load equipment and power contactors, etc.

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