Sensor adaptive type compound electrical fire monitoring detector

Abstract

The invention discloses a "sensor adaptive type compound electrical fire monitoring detector ", which comprises a sensor self-identification unit, a sensor sampling, amplifying and filtering unit, a power circuit unit, a voltage zero crossing signal sampling processing unit, a sensor reference voltage stabilizing reference unit, a CAN (Controller Area Network) communication and protection unit, anaudible and visible alarming driving unit and an MCU (Microprogrammed Control Unit) micro processor. The detector can automatically identify the type of a sensor and broken circuit and short circuitstates of a sensor connecting wire and set amplifier circuits having different gains for residual current transducer type sensors or temperature measurement type sensors after the self-identificationis completed; meanwhile, by the arrangement of a two-order active filter and the adoption of a sensor reference voltage stabilizing reference circuit, a voltage zero crossing signal processing technology, a signal shielding technology, a CAN communication bus alarming signal initiative uploading technology and the high-performance MCU micro processor, in cooperation with a relevant software algorithm, the measuring precision and the electromagnetic interference resistance of the detector are greatly improved, the alarming signal uploading time is shortened, mis-alarming of the detector is reduced, and the working stability of the detector is increased.

Description

technical field [0001] The invention relates to an electrical fire monitoring detector, in particular to a sensor self-adaptive composite electrical fire monitoring detector. Background technique [0002] In recent years, my country's electrical fires have been in a high-occurrence situation. According to statistics from relevant departments, from 2011 to 2016, a total of 524,000 electrical fires occurred in my country, accounting for more than 30% of the total number of fires in the country. The prevention and control of electrical fires has risen to the national level. Strategy, the quality requirements for electrical fire detectors are particularly important. [0003] Electrical fire monitoring detectors are the leading products of electrical fire early warning that are mainly promoted in my country at this stage, mainly including two categories: residual current monitoring detection alarm and temperature monitoring detection alarm. Although electrical fire detectors have...

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Problems solved by technology

The second is the low safety factor of detector design: electrical fire monitoring detectors are generally installed in low-voltage power distribution cabinets, and usually monitor low-voltage power distribution circuits of 220V or 380V, and temperature-measuring detectors are mostly used to monitor wiring terminals. Temperature, if the power supply part of the detector and the temperature sensor part are not effectively isolated, there will be a risk of high voltage being connected to the detector in series, which will affect the safe operation of the entire system. At the same time, the non-isolation of the communication and power supply parts will also cause the above problems

The third is the low degree of intelligence of the detector: since the electrical fire monitoring detector is generally installed in the power distribution cabinet, and monitors the residual current of the distribution line and the temperature of the cable at the same time, most power distribution cabinets need to be equipped with two different types of detectors at the same time. Products can meet the monitoring requirements, which will make the system complex, increase the failure rate, and also increase the cost

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