CN101546466A

CN101546466A - Smoke sensing module

Info

Publication number: CN101546466A
Application number: CN200810065864A
Authority: CN
Inventors: 武光杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-24
Filing date: 2008-03-24
Publication date: 2009-09-30

Abstract

The invention relates to a circuit module for detecting smoke concentration in air environment by utilizing a smoke sensor. When the smoke concentration in the air environment exceeds a set alarm concentration of a sensing module, the sensing module outputs a high-level alarm control signal, and at the same time, a light emitting diode twinkles. The smoke sensing module components comprise the smoke sensor, the light emitting diode, a signal processing singlechip, a power source input and signal output port, a power source voltage stabilizer, circuit board positioning screw holes, and the like, and use a 9-20V DC power source to work. The smoke sensing module has the characteristics of high detection sensitivity, wide use voltage range and simple use, and can be used for fireproof/safe detection and control systems of families, factories and commercial places.

Description

Smoke sensing module

Technical field

The present invention relates to the smoke transducer application technology, relate in particular to smoke sensing module.

Background technology

At present, smoke transducer is mainly used in fire safety of family, factory, commercial location etc. above the product, be used for detecting smokescope in the air ambient, when the smokescope in the air ambient exceeds the warning concentration of product setting, produce alerting signal, generally need the special circuit of design to use, use and directly add power supply, less with the product of smoke transducer modular structure.For being used, oversimplifies smoke transducer, the invention provides a kind of smoke sensing module, this module is with smoke transducer, the indication light emitting diode, signal comparator, signal processing single chip, power regulators etc. are integrated on the circuit board of a 22*33mm, use the work of 9-20V direct supply, use simply, smoke transducer is more widely used.

Summary of the invention

The object of the invention provides a kind of smoke sensing module, is used for detecting smokescope in the air ambient, when smokescope in the air ambient exceeds the warning concentration of setting of induction module, and module output alarm control signal, light emitting diode lamp flicker simultaneously.The high-level control signal of output alarm can directly drive load, in time eliminates safe hidden trouble, and also can be used for other above product through developing once more.

To achieve the above object of the invention, the present invention proposes following technical scheme:

A kind of smoke sensing module is characterized in that: components and parts are provided with above the circuit board of this module (Fig. 3): smoke transducer MQ-2, the indication light emitting diode of reporting to the police, power regulator 7805, signal processing single chip, signal comparator etc.

The direct supply of 9-20V is through the voltage of power regulator generation 5V, for smoke sensing module work.Smoke transducer MQ-2, detect smokescope in the air ambient, the signal of sensor output, the voltage comparator of forming by LM358 inputs to single-chip microcomputer, single-chip microcomputer is by gathering the signal level of voltage comparator input, analyze whether smokescope exceeds the warning concentration of the setting of induction module in the air ambient, also detect the duty of smoke transducer by voltage comparator.When smokescope in the air ambient exceeds the warning concentration of induction module setting, module output high level alarm control signal, light emitting diode lamp flicker simultaneously.

Design feature of the present invention:

1 voltage range is wide, uses direct current 9-20V.

2 use simple, power supply+, power supply-and signal output, three lead-in wires.

3 volumes are little, convenient installation, wiring board size 22*33mm.

The present invention can be widely used in the fire prevention/safety of family, factory, commercial location and survey fields such as control.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is the fundamental block diagram of smoke sensing module of the present invention.

Fig. 2 is the electrical schematic diagram of smoke sensing module of the present invention.

Fig. 3 is the contour structures and the components and parts location drawing of smoke sensing module circuit board of the present invention.

Fig. 4 uses figure for the signal of smoke sensing module of the present invention.

Fig. 5 uses figure for the DC load of smoke sensing module of the present invention.

Fig. 6 uses figure for the AC load of smoke sensing module of the present invention.

Fig. 3 is the contour structures and the explanation of the components and parts location drawing of smoke sensing module circuit board of the present invention:

Among the figure: circuit board physical dimension 22*33mm (1), signal processing single chip (2), smoke transducer (3), set screw hole (4), luminous indicating diode (5), voltage comparator (6), power regulator 7805 (7), power supply are connected location staight needle (8) with signal.

Embodiment

The DC voltage that is input to smoke sensing module 9-20V through 7805 voltage regulation filterings after, the voltage that produces 5V is for modular circuit work.

1 single-chip microcomputer work is implemented:

The 13 pin oscillatory circuits of single-chip microcomputer 48R05A are made up of C23 and R28, and reset circuit is made up of the R29 and the C25 of 11 pin.The induced signal of smoke transducer is input to 16 and 17 pin of single-chip microcomputer through the voltage comparator that LM358A/B forms.The high level signal of controlling alarm is exported by 4 pin.18 pin sending and receiving optical diodes are finished the indication of reporting to the police, the smoke transducer Performance Detection that powers on indication and sensor failure indication.

The indication of electro-detection and light emitting diode is implemented on 2 smoke transducers:

Connect the 9-20V direct supply, red light emitting diodes is once bright, after stopping for 3 seconds, the output level of single-chip microcomputer detection comparator, judge whether operate as normal of smoke transducer, if the heating resistor of sensor opens circuit, red light emitting diodes is with 0.5 time/second frequency scintillation, and the prompting smoke transducer lost efficacy.If the sensor heating resistor is normal, output voltage is more than 1.5V, and module enters normal detected state.If be lower than 1.5V, illustrate that sensor can't normally detect, red light emitting diodes is with each/1 second frequency scintillation, when single-chip microcomputer detects sensor output voltage and is 1.5V by voltage comparator, light emitting diode stops flicker, and module enters normal detected state.

3 smoke transducer MQ-2 report to the police and the light emitting diode indication is implemented:

Smoke sensing module enters normal operating conditions, and when smokescope in the air ambient exceeded the warning concentration of module settings, LM358B output level signal from high to low triggered single-chip microcomputer and reports to the police.Single-chip microcomputer 18 pin output signals, the control red light emitting diodes is with 1.5 times/second frequency scintillations, and the high-level control signal of 4 pin output alarms is for external use.During the warning, single-chip microcomputer incessantly detects the level signal of LM358B output, have only when smokescope in the air ambient is lower than the warning concentration of module settings, LM358B output level signal from low to high after single-chip microcomputer collects this signal, determines that smokescope is recovered normal value in the air ambient, single-chip microcomputer was delayed time after 30 seconds, stop alerting signal output, single-

chip microcomputer

4,18 pin output low level signals, smoke sensing module returns to normal detected state.

As can be seen from the above technical solutions, the present invention reports to the police smoke transducer to indicate light emitting diode, power regulator 7805, and signal processing single chip, electronic devices and components such as signal comparator are integrated on the circuit board of a 22*33mm, form smoke sensing module.By signal processing single chip, finish electro-detection on the smoke transducer automatically, the luminous indication of last electro-detection, the sensor failure indication reaches functions such as the indication of reporting to the police automatically.Modular power uses the 9-20V direct supply less than 0.8W, and the output induced signal can be used as level signal and uses or directly drive load, uses simply, and the fire prevention/safety that can be widely used in family, factory, commercial location is surveyed fields such as control.

Claims

1, a kind of smoke sensing module is characterized in that:

Components and parts are provided with above the circuit board of this module (Fig. 3): circuit board physical dimension 22*33mm (1), signal processing single chip (2), smoke transducer MQ-2 (3), set screw hole (4), luminous indicating diode (5), voltage comparator (6), power regulator 7805 (7), power supply are connected location staight needle (8) with signal.

2, smoke sensing module according to claim 1, it is characterized in that: components and parts are provided with above the circuit board of this module (Fig. 3): circuit board physical dimension 22*33mm (1), signal processing single chip (2), smoke transducer MQ-2 (3), set screw hole (4), luminous indicating diode (5), voltage comparator (6), power regulator 78M05 (7), power supply are connected location staight needle (8) with signal.

3, according to the described smoke sensing module circuit board of claim 2 (Fig. 3) physical dimension 22*33mm, smoke transducer MQ-2 (3) is arranged on the circuit board, be in the positive center of wiring board level.2 set screw hole 2mm (4) are on wiring board lower-left and the upper right diagonal line.The indication light emitting diode (5) of reporting to the police is in the position that takes over directly over the wiring board level.Power supply is connected location staight needle (8) with signal, be in side on the lower side, the positive center of wiring board level.Power regulator 78M05 (7) is under the wiring board and is positioned at power supply and is connected with signal above location staight needle (8).Signal comparator (6) is in the right on the upper side, wiring board center.