Super-capacitor application circuit of battery replaceable type smart electric energy meter power supply

Abstract

The invention relates to a smart electric energy meter, in particular to a super-capacitor application circuit of a battery replaceable type smart electric energy meter power supply. The super-capacitor application circuit is low in power consumption, and the super-capacitor holding time is long. The super-capacitor application circuit comprises a transformer T1, a rectifying circuit, a voltage stabilizing circuit and a sampling circuit, and further comprises a dual-super-capacitor clock backup power circuit. The dual-super-capacitor clock backup power circuit comprises a clock chip, an electric energy meter processing unit, an anti-reverse diode D5, a super-capacitor C6 and a charge-discharge resistor R6, wherein the clock chip comprises a main power supply end Vcc2, a backup power supplyend Vcc1, a chip select signal end CE, a data signal end I / O and a communication clock signal SCLK; the main power supply end Vcc2 is connected with the voltage stabilizing circuit, and the backup power supply end Vcc1 is connected with the positive pole of the anti-reverse diode D5. By means of the super-capacitor application circuit, the cost of an electric energy meter is little increased; thepower consumption increased by the circuit is very low; the trickle charge current is very low, and the service life of the super-capacitor C4 and the service life of the super-capacitor C6 are prolonged.

Description

technical field [0001] The invention relates to an intelligent electric energy meter, in particular to a supercapacitor application circuit for a battery-replaceable intelligent electric energy meter power supply. Background technique [0002] The timing function of the smart energy meter is very important, and it will affect important functions such as billing and event recording. The clock module can work normally during power failure. However, long-term use of lithium batteries will cause passivation, which shortens the battery life, so it needs to be replaced after a period of use. But the clock battery of the original smart energy meter is welded on the circuit board of the energy meter, so it is inconvenient to replace, and the battery must be replaced in a power-off state. In order to solve the problem that the battery cannot be replaced when the clock battery of the single-phase smart energy meter is undervoltage, the State Grid Metrology Center took the lead in fo...

AI Technical Summary

Problems solved by technology

However, since the charging resistor and the discharging resistor are the same resistor, the discharge speed is also very fast, which reduces the maintenance time of the supercapacitor.

[0005] (2) Under the condition that the performance of the supercapacitor is degraded or the power is cut off for more than 2 days, the maintenance time of the supercapacitor cannot meet the requirements

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