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Heating circuit of electric energy meter for low temperature environment

A technology for heating circuits and low-temperature environments, which is applied in the direction of measuring electrical variables, instruments, and measuring devices, and can solve problems such as slow display refresh rate

Active Publication Date: 2013-03-13
WAHLAP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The circuit of the present invention solves the inherent problem of slow display refresh rate of liquid crystal display units in low temperature environments, and can meet the display requirements of liquid crystal electric energy meters in severe cold regions such as Northeast China and Siberia.

Method used

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  • Heating circuit of electric energy meter for low temperature environment

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Embodiment Construction

[0020] refer to figure 1 The preferred embodiment of the electric energy meter heating circuit used in the low temperature environment of the present invention includes a power supply circuit 10 and a heating circuit 20, and further includes a temperature control circuit 30 and a voltage comparison circuit 40, wherein the live line L and the neutral line N of the power line of the power system are connected Into the power supply circuit 10, the power supply circuit 10 is connected to the voltage comparison circuit 40 and the heating circuit 20 and supplies power to them, the temperature control circuit 30 is coupled and electrically connected to the voltage comparison circuit 40, and connected to the heating circuit 20 .

[0021] Further, in a preferred embodiment of the present invention, the power supply circuit 10 is composed of a varistor MOV1, a transformer T1, a rectifier bridge D1, capacitors C1, C2, electrolytic capacitors E1, E2 and a voltage stabilizing chip U1. The...

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Abstract

The invention discloses a heating circuit of an electric energy meter for a low temperature environment. The heating circuit comprises a power circuit, a heating circuit, a temperature control circuit and a voltage comparison circuit, wherein a power line of an electric power system is connected to the power circuit which is connected to and supply power for the voltage comparison circuit and the heating circuit, and the temperature control circuit is coupled and electrically connected with the voltage comparison circuit and connected to the heating circuit. According to the heating circuit, the existing problem that the display refresh rate of a liquid crystal display unit is low in the low temperature environment is solved, the display requirement for liquid crystal electric energy meters in severe cold regions can be satisfied, the requirement for normal display of liquid crystals at the temperature of minus 40 DEG C can be satisfied, and the heating circuit can heat the liquid crystals on the premise that the whole meter power is smaller than 2W and the input voltage of the electric energy meter is as low as 70%Un.

Description

technical field [0001] The invention relates to the technology of electrical measuring instruments, and more specifically, the invention relates to a heating circuit of an electric energy meter used in a low-temperature environment. Background technique [0002] With the development of electric energy meter technology, liquid crystal display electric energy meter has become the mainstream. However, due to the slow display speed of liquid crystals in low temperature environments, conventional liquid crystal watches are not suitable for use in severe cold environments such as Northeast China and Siberia. The traditional liquid crystal heating scheme lacks a temperature control circuit, and heating all the time shortens the service life of the liquid crystal. The power consumption is relatively large, which does not meet the requirement that the power consumption of the electric energy meter is less than 2W. Lack of power control for the whole system, when the input voltage i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R22/00G02F1/133
Inventor 钱海波陈凯宋锡强
Owner WAHLAP TECH CO LTD
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