Early warning device of main-frequency voltage

Abstract

An early warning device of power frequency voltage is composed of induction signal sensor formed by connecting induction element to the grid of FET, detection controller using single-chip computer and special software, audio alarm and casing, and features that the drain of FET is connected to at least one input of single-chip computer, whose output is connected with input of audio alarm. Its advantages include simple hardware, high integrated level, flexible extension of functions, high intelligent level and reliability and less electric consumption.

Description

technical field [0001] The invention relates to a power frequency near-electricity notification device, in particular to a portable electronic early warning device capable of early warning of the existence of a short-distance power frequency AC electric field, which is necessary for electrician safety production. Background technique [0002] As a small portable safety warning tool, the power frequency voltage early warning device is of great significance in the safety production work of power system construction operators. In the prior art, the Chinese patent once disclosed a patent application called "Portable Near Electric Notifier" on August 12, 1998, the application number is 97106269.2, and the publication number is CN1190190A. This patent application discloses a certain representative technical solution with the theme of a portable power frequency AC electric field alarm device, which is specifically composed of a field effect tube, a Schmidt...

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Problems solved by technology

Although the above scheme has higher sensitivity, better reliability and stronger anti-interference performance, especially anti-static performance , but with technological progress, the above technical solutions still have the following deficiencies: 1. Due to the use of digital pulse circuit design concepts, the hardware circuit structure is complex and consumes a lot of power, especially composed of Schmitt triggers, counters and oscillators 2. Due to the limitations of hardware circuits, the ability to resist static electricity and stray strong electric fields needs to be further improved; 3. The level of intelligence is low. For example, it can only warn of the existence of power frequency voltage, but cannot identify different voltage levels. ;4. The battery power can only be detected manually, and there is no automatic self-test function when starting up. If the user forgets to check the battery power after turning on the power, once the battery is exhausted, the alarm will stop working, which will easily cause greater safety hazards.

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