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Direct-current fan failure alarm circuit

A DC fan and alarm circuit technology, applied to alarms, instruments, etc., can solve the problems of 48V two-wire DC fan failure alarm, three-wire pulse signal using different environments, etc., and achieve high reliability and low cost. Effect

Inactive Publication Date: 2013-07-10
CHANGZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing invention patent "fan failure alarm circuit (public number: CN101221526A)" cannot solve the problem of 48V two-wire DC fan failure alarm in the cabinet due to the use of three-wire pulse signal detection and different use environments

Method used

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  • Direct-current fan failure alarm circuit
  • Direct-current fan failure alarm circuit
  • Direct-current fan failure alarm circuit

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Embodiment Construction

[0021] The present invention will be further explained below according to specific embodiments and accompanying drawings.

[0022] Such as figure 1 As shown, the DC fan failure alarm circuit includes a power supply, a DC fan, a sampling resistor R1, a differential conversion circuit, an integral conversion circuit, a drive circuit and a dry contact alarm output circuit, the power supply is connected in series with the DC fan and the sampling resistor, and the The positive pole of the power supply is connected to the positive voltage input terminal of the differential conversion circuit, integral conversion circuit, drive circuit and dry contact alarm output circuit, and the negative pole of the power supply is connected to the differential conversion circuit, integral conversion circuit, drive circuit and dry contact alarm output circuit The negative voltage input terminal of the differential conversion circuit is connected between the DC fan and the sampling resistor, and the...

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PUM

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Abstract

The invention discloses a direct-current fan failure alarm circuit. The direct-current fan failure alarm circuit comprises a power supply, a direct-current fan, a sample resistor, a differential transformation circuit, an integral transformation circuit, a driving circuit and a dry contact alarm output circuit. The power supply is connected with the direct-current fan and the sample resistor in series, the signal receiving end of the differential transformation circuit is connected between the direct-current fan and the sampling resistor, the differential transformation circuit filters direct-current components after receiving pulse voltage signals output by the sampling resistor to obtain periodic alternating signals which are the same as rotating speed of the direct-current fan, and transmits the periodic alternating signals to the integral transformation circuit, after the integral transformation circuit conducts integral processing on the received periodic alternating signals, the periodic alternating signals are transmitted to the driving circuit to be amplified and then output to the dry contact alarm output circuit, and alarm output is controlled through control of switching-on and switching-off of an electromagnetic relay coil in the dry contact alarm output circuit.

Description

technical field [0001] The invention relates to a fan failure alarm circuit, in particular to a DC fan failure alarm circuit. Background technique [0002] With the development of Internet technology and 3G mobile phone application markets, operators such as China Mobile and China Telecom have invested heavily in establishing their own backbone communication networks, including infrastructure such as communication hub computer rooms, optical fiber lines, and outdoor communication cabinets. Cabinets, mobile base stations and mobile computer rooms (hereinafter referred to as "cabinets") are becoming more and more extensive as the indispensable infrastructure of communication networks. The communication equipment placed in these facilities provides a reliable guarantee for our "surfing the Internet" all year round. . The long-term uninterrupted work of communication equipment produces a large amount of heat energy. If the heat energy cannot be removed in time, the normal servi...

Claims

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Application Information

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IPC IPC(8): G08B21/00
Inventor 唐学忠王文费贤举
Owner CHANGZHOU INST OF TECH
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