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Ammeter and power supply circuit therein, and power supply control method inside the ammeter

A technology for power supply circuits and electricity meters, applied in circuit devices, electrical components, measuring electrical variables, etc., can solve problems such as affecting the service life of batteries and reducing the safety of electric energy meters, so as to reduce disassembly and maintenance costs, reduce losses, technology obvious effect

Inactive Publication Date: 2015-08-05
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the battery power consumption is too large in practical applications, it will seriously affect the service life of the battery and reduce the safety of the electric energy meter.

Method used

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  • Ammeter and power supply circuit therein, and power supply control method inside the ammeter

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Embodiment Construction

[0023] Reference figure 1 , Which schematically illustrates a multi-channel power supply control circuit in a three-phase electric meter, used to select and control multiple power supplies to supply power to the functional devices in the electric meter, including a first set between the at least one power source and the functional device The switch, preferably a transistor D5 and a transistor D6 electrically connected to it, is used to select a power source, for example, when an AC power source is obtained from an external source, it is converted into a DC large current and a DC provided by an internal energy storage circuit through a current-voltage conversion CT. Choose between currents; connect the second switches Q1 and Q2 of the first switch D5, perform closing or opening actions according to the first switches D5 and D6, and further connect multiple power supplies to form a closed loop; And a voltage limiting device arranged in the closed loop is used to control the on-off...

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Abstract

The embodiment of the invention provides an ammeter. The ammeter comprises function devices and a power supply priority control circuit coupled thereto through a power line. The power supply priority control circuit comprises a first power supply, wherein an alternate voltage drop circuit performs A / D conversion of the AC voltage portion in the power supply and converts the AC voltage portion into first DC voltage through an electrically coupled DC / DC converter for supplying to a part of the function devices for operation; a first switch controlling on-off of the first power supply and the ammeter function devices; a second power supply used for directly supplying DC voltage to the other part of the ammeter function devices; a second switch controlling on-off of the second power supply and the ammeter function devices; and a voltage limiting device connected between the first switch and the second switch for controlling the corresponding on-off sequence of the second switch through the on-off of the first switch. The invention also discloses a power supply circuit inside the ammeter, and a power supply control method inside the ammeter.

Description

Technical field [0001] The embodiments of the present invention mainly relate to grid power control technology, and more specifically, to an electric meter and a power control circuit thereof. Background technique [0002] Electric measurement equipment, especially some functional board components in electric meters or distribution transformer acquisition terminals need to be powered by batteries. For example, in three-phase smart meters, there are two types of batteries, one is clock battery, and the other is stop reading Batteries, these two kinds of batteries play a very important role in data storage and cost settlement of three-phase smart meters. If the battery power consumption is too large in practical applications, it will seriously affect the battery life and reduce the safety of the electric energy meter. In order to better realize battery switching and reduce battery loss, a battery switching circuit based on P-MOS technology is proposed. Summary of the invention [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06G01R11/00
CPCY02B70/30Y04S20/20
Inventor 虞伟贺伟军姜才军王建军王炜凯戴浩斌
Owner STATE GRID CORP OF CHINA
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