Power failure reporting realization method and circuit of power utilization information acquisition equipment

Abstract

The invention relates to a power failure reporting realization method and circuit of power utilization information acquisition equipment. According to a power failure detection method, a power failure state is judged by detecting power supply voltage and a power grid zero crossing point signal of a power meter through a communication module; a circuit scheme comprises a charging circuit (1), a Farad capacitor (2), a boosting circuit (3) and a power failure detection and control circuit (4). The charging circuit (1) is connected with input voltage VDD (Voltage Drain Drain); the output of the charging circuit (1) is connected with the Farad capacitor (2); the input of the boosting circuit (3) is connected with the Farad capacitor (2); the power failure detection and control circuit (4) is connected with 4 pins EN of U1 of the charging circuit (1) and the boosting circuit (3) respectively. The invention provides the power failure reporting circuit which is applicable to the communication module and can realize the effects of simple circuit structure, low cost, high reliability and complete functions.

Description

technical field [0001] The invention relates to a method and a circuit for realizing power failure report of an electricity consumption information collection device, and belongs to the technical field of electric power. Background technique [0002] According to the requirements of the State Grid, when the grid failure or the abnormality of the meter causes a sudden power failure, the communication module will report the sudden power failure event. The power failure reporting function helps to obtain the power supply network failure in time, and facilitates troubleshooting and maintenance. . [0003] Since the energy storage unit of the current meter only provides power for itself, it is necessary to add an energy storage unit to the communication module. There are currently two energy storage solutions, one is a rechargeable battery, but the rechargeable battery has a chemical reaction of charging and discharging, and there is a limit on the number of times. , and the siz...

AI Technical Summary

Problems solved by technology

[0004] Since the communication module is powered by 12V voltage and must meet the power output within a certain period of time, for example, the State Grid requires that the BPLC communication module can meet the power supply time of 30s after power failure, and also needs to meet the power requirement of 1.5W; but in general, The nominal voltage of a single Lafar capacitor is about 2.65V. To achieve the voltage requirement of 12V, the currently known solution is to increase the voltage by connecting multiple Farad capacitors in series. Need to ensure balance to achieve maximum capacity and system security

The design of the equalization circuit is more complicated, and it may cause extra power consumption, which will affect the reliability of the entire system

Even if multiple farad capacitors are connected in series to achieve a high voltage such as 20V, and then realize 12V through a step-down scheme, once the input voltage is lower than 12V, the output 12V will also decrease, and the voltage cannot be stabilized, unless the buck-boost circuit is used, the circuit is complicated, Low reliability, high cost and bulky

[0005] In practical applications, there may be several situations. One is that when the grid voltage fluctuates greatly, and the other is that when the power line load is heavy, the power consumption increases during carrier transmission, which may cause the voltage provided by the meter to the communication module to decrease. If the communication The module simply judges the power-off state by detecting the voltage value provided by the ammeter, and there may be false positives or false positives; in addition, when the communication module is pulled out, the communication module may also be misjudged as a power-off state. It is possible to report the power-down event, causing false positives or false positives; so for this application, how to accurately judge the power-down state is the focus of this application requirement

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