Three-phase charge-controlled electric energy meter based on resistance-capacitance voltage reduction and low-voltage direct-current/direct-current (DC/DC) power supply

Abstract

The invention relates to a three-phase charge-controlled intelligent electric energy meter, and provides a low-power-consumption three-phase charge-controlled intelligent electric energy meter in which a three-phase charge-controlled electric energy meter power supply scheme is based on a resistance-capacitance voltage reduction principle and a low-voltage direct-current / direct-current (DC / DC) conversion power supply. The electric energy meter comprises a line power supply, an auxiliary power supply, a singlechip central processing unit (CPU) and a three-phase charge-controlled intelligent electric energy meter basic function module, wherein the line power supply consists of a resistance-capacitance voltage reduction circuit, a low-voltage DC / DC switching power supply circuit and a 485 power supply control circuit which are connected in turn; the auxiliary power supply is a switching power supply circuit; a pulse output booster circuit at an input / output (IO) port provides working voltage for a liquid crystal display part of the three-phase charge-controlled electric energy meter; and an external battery power supply circuit of the three-phase charge-controlled electric energy meter consists of an external battery which is matched with a DC-DC booster circuit to provide a power supply for meter reading during power failure. Power supply efficiency can be effectively improved, the power consumption of the electric energy meter is reduced, cost is reduced, and the requirements of energy conservation and environment friendliness are met.

Description

technical field [0001] The invention relates to a three-phase cost-controlled intelligent electric energy meter, in particular to a low-power three-phase electric energy-controlled electric energy meter with a power supply scheme using a resistance-capacitance step-down principle and a low-voltage DC / DC conversion power supply. Background technique [0002] At present, the transformer scheme is widely used in the power supply scheme of the three-phase fee-controlled smart energy meter. The transformer scheme has the advantages of high stability and good isolation effect, but the general transformer power supply scheme has low efficiency and large volume. The smart energy meter consumes a lot of power, and the whole machine is heavy, which cannot meet the needs of the modern society for energy saving and consumption reduction of the energy meter itself. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the above-ment...

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Problems solved by technology

[0002] At present, the transformer scheme is widely used in the power supply scheme of the three-phase fee-controlled smart energy meter. The transformer scheme has the advantages of high stability and good isolation effect, but the general transformer power supply scheme has low efficiency and large volume. The power consumption of the smart energy meter is large, and the whole machine is heavy, which cannot meet the needs of the modern society for energy saving and consumption reduction of the energy meter itself.

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