Resistance-capacitance power supply for tri-manganin electric energy meter

Abstract

The invention discloses a resistance-capacitance power supply for a tri-manganin electric energy meter. A voltage-stabilizing module, a first voltage-stabilizing diode, first and second diodes, a safety regulation capacitor and a current-limiting resistor are arranged between a phase A and a neutral wire N, between a phase B and the neutral wire N and between a phase C and the neutral wire N, wherein a first diode unit is connected with an input end of a phase wire voltage-stabilizing module connected with a phase wire; a second diode unit is connected with an input end of a neutral wire voltage-stabilizing module connected with the neutral wire; the safety regulation capacitor and the current-limiting resistor are connected in series between the first diode unit and the second diode unit; the anode of the first voltage-stabilizing diode is connected with the phase wire, and the cathode of the first diode is connected with the input end of the phase wire voltage-stabilizing module; the anode of the second voltage-stabilizing diode is connected with the neutral wire, and the cathode of the second diode is connected with the input end of the neutral wire voltage-stabilizing module; and the output voltage of the neutral wire voltage-stabilizing module is loaded on a singlechip of the electric energy meter, and the output voltage of the phase wire voltage-stabilizing module is loaded on a metering chip of the electric energy meter. The resistance-capacitance power supply has the advantages that: a printed circuit board (PCB) resource is not occupied, the reliability is high, and the cost is low.

Description

technical field [0001] The invention relates to a resistance-capacitance power supply for a manganese-copper electric energy meter. Background technique [0002] The RC power supply using safety capacitors has the characteristics of strong antimagnetic, wide input voltage, small size, light weight, and low price, so it has been widely used in single-phase electric energy meters, various household appliances and other fields. The application of resistance-capacitance power supply on the three-phase four-wire electric energy meter is bound to improve the anti-magnetism and design cost of the three-phase four-wire electric energy meter, so that it has good electrical performance and economic benefits. [0003] Chinese Patent No. 200620006650.8 discloses a current sampling circuit of an electric energy meter and its electric energy meter. The signal output terminals are respectively connected to the signal input terminals of the metering chip. Advantages: First, the current sa...

AI Technical Summary

Problems solved by technology

The disadvantage is that it needs to use multi-output transformer or switching power supply, which will inevitably increase the difficulty of hardware design and hardware cost.

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