Electric energy meter power supply system and rechargeable battery protection circuit thereof

By integrating an anti-backflow unit, a current limiting unit, and a feedback regulation module into the power supply system of the electricity meter, the problems of current backflow and uncontrolled charging current are solved, achieving efficient battery charging and stable power supply to the load, thereby improving circuit reliability and battery life.

CN122339019APending Publication Date: 2026-07-03HENAN XJ INSTR
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Patent Information

Application Number
CN202610334161.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-18
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing power meter power supply systems suffer from problems such as reverse current from rechargeable batteries, uncontrolled charging current, excessive voltage drop, and insufficient output voltage accuracy, which affect backup power supply duration and normal load operation.

Method used

The rechargeable battery protection circuit adopts an integrated anti-backflow unit, current limiting unit, and feedback regulation module, including a high-frequency synchronous rectification buck switching mode converter, current limiting resistor, and diode, to ensure unidirectional current flow, current limiting, and stable output voltage.

Benefits of technology

It effectively prevents reverse current flow, ensures reasonable charging current, reduces voltage loss, improves circuit reliability and load adaptability, extends battery life and ensures stable load operation.

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Abstract

The invention relates to an electric energy meter power supply system and a rechargeable battery protection circuit thereof, and belongs to the technical field of power supply protection. The anti-backflow unit is integrated in the step-down conversion module and is used for preventing the current of the rechargeable battery from flowing back to the power input module, so that the invalid loss of the capacitor is reduced; a current limiting unit and a first one-way conduction unit are integrated in the charging control module, the current limiting unit is used for limiting charging current flowing to the rechargeable battery, the first one-way conduction unit is used for ensuring that the charging current flows to the rechargeable battery in a one-way mode, and the current limiting unit controls the charging current through the resistance characteristic of the current limiting unit. And the first one-way conduction unit can ensure that the charging current flows to the battery in one way and prevent the current from reversely flowing into the circuit when the battery discharges, so that the balance of'efficient charging and battery protection 'is realized, the reliability of the circuit is improved, and the service life of the battery is prolonged.
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