Battery passivation preventing circuit of single-phase intelligent electric energy meter

Abstract

The invention discloses a battery passivation preventing circuit of a single-phase intelligent electric energy meter. The battery passivation preventing circuit comprises a main CPU, a main power source, a power supply battery, an energy storage circuit, a voltage monitoring circuit and a discharging circuit, wherein the main power source and the power supply battery are connected with the main CPU, the energy storage circuit is arranged between the main power source and the power supply battery, the voltage monitoring circuit is used for monitoring the voltage of the power supply battery, and the discharging circuit is used for controlling the power supply battery to carry out interval discharging to activate passivation. The energy storage circuit comprises a duodiode and an energy storage capacitor, when power is supplied by the main power source, a diode connected with the main power source is turned on to supply power to the main CPU and charge the energy storage capacitor at the same time, when power down occurs, the energy storage capacitor and the power supply battery jointly serve as a standby power source to supply power to a system, and the power supply battery is converted into a final standby power source along with gradual elimination of battery passivation; after the power is supplied by the power supply battery, the diode connected with the power supply battery is turned on to charge the energy storage capacitor. According to the battery passivation preventing circuit, battery passivation is effectively eliminated, and system abnormal work caused by battery passivation is avoided.

Description

technical field [0001] The invention relates to a battery anti-passivation circuit, in particular to a single-phase intelligent electric energy meter battery anti-passivation circuit. Background technique [0002] The smart meter of the State Grid adopts tariff measurement and has functions such as power settlement, timing freezing, load recording, and power failure LCD display. These functions are based on accurate timekeeping, and accurate timekeeping is inseparable from the normal power supply of the clock battery during power outages. According to the requirements of relevant standards, the design life of the smart energy meter should be greater than 15 years. To make the clock battery work normally within the design life, the selection and quality control of the clock battery, battery control circuit design, CPU low power consumption design, and later maintenance The convenient replacement of the clock battery is very important. Especially in the design of single-phase...

AI Technical Summary

Problems solved by technology

The current design of single-phase smart energy meters generally only considers the battery discharge under normal conditions, and does not consider the impact of battery discharge under passivation conditions. As a result, during a power outage, the battery cannot maintain the required voltage and power at the moment of activation. As a result, a large number of electric energy meters have various faults during the power-off process

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