CN103446697A - Linkage fault detection device for point type fire detector - Google Patents

Abstract

The invention discloses a connection fault detection device for a point type fire detector. The connection fault detection circuit includes a first switching tube, a second switching tube, a voltage regulator tube, a first optical coupler, a second optical coupler, The power supply and the second power supply, the point-type fire detector, the primary of the first optocoupler, and the base-emitter of the first switching tube are connected in series between the two ends of the first power supply, and the first optocoupler The collector of the stage is connected to one of the signal input terminals of the core controller; the emitter-base of the second switching tube and the regulator tube are connected in series between the positive pole of the first power supply and the collector of the first switching tube, and the second The collector of the switch tube is connected to the positive pole of the primary of the second optocoupler, and the collector of the secondary of the second optocoupler is connected to the other signal input end of the core controller. The invention can output the short-circuit and open-circuit fault information of the point type fire detector to the core controller to avoid malfunction.

Description

A point-type fire detector connection fault detection device

technical field

The invention relates to a fault detection device, in particular to a point type fire detector connection fault detection device.

Background technique

Point fire detectors are widely used in various fire protection systems, and they cooperate with the core controller to play a huge role in various fire protection systems. In 2002, the Ministry of Public Security launched the GA386-2002 standard, which requires that the fire protection system composed of point fire detectors and core controllers should have the detection function of short circuit or open circuit faults of point fire detectors, and be able to send out corresponding sound and light alarm signals . However, at present, the fire protection system formed by the point-type fire detectors and core controllers of the prior art still does not have this function, which leads to: when the point-type fire detectors open and a fire occurs, the core control The detector judges that there is no fire; when the point type fire detector is short-circuited and no fire occurs, the core controller judges that a fire has occurred. Obviously, if the fire protection system composed of point fire detectors and core controllers cannot effectively detect the connection failure of point fire detectors, it is likely to cause immeasurable losses to the user's personal and property safety in the event of a fire .

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a point type fire detector connection fault detection device, which can short-circuit or open the point type fire detector when the point type fire detector has a short circuit or open circuit fault. The fault information is sent to the core controller in time, so that the core controller can respond accordingly to avoid malfunctions.

The technical solution adopted by the present invention to solve the technical problem is: a point-type fire detector connection fault detection device, which includes a point-type fire detector and a core controller, and also includes a connection fault detection circuit. The connection fault detection circuit includes the first A switching tube, a second switching tube, a regulator tube, a first optocoupler, a second optocoupler, a first power supply and a second power supply, a point fire detector, the primary of the first optocoupler, the second The base-emitter of a switching tube is connected in series between the two ends of the first power supply, and the collector of the second side of the first optocoupler is connected to one of the signal input terminals of the core controller; the emitter-base of the second switching tube The voltage regulator tube is connected in series between the positive pole of the first power supply and the collector of the first switching tube, the collector of the second switching tube is connected to the primary anode of the second optocoupler, and the primary cathode of the second optocoupler Ground, the secondary collector of the second optocoupler is connected to the other signal input terminal of the core controller; the primary of the first optocoupler and the second optocoupler are powered by the first power supply, and the secondary is powered by the second power supply powered by.

The connection fault detection circuit also includes a third switch tube, the base of the third switch tube is connected to the enable/reset control terminal of the core controller, and the collector of the third switch tube is connected to the emitter of the first switch tube , the emitter of the third switching tube is connected to the negative pole of the first power supply.

The connection failure detection circuit further includes a first resistor connected in parallel with the primary phase of the first optocoupler.

The connection fault detection circuit further includes a second resistor and a third resistor, the second resistor is connected between the base of the second switching tube and the cathode of the voltage regulator tube, and the third resistor is connected to the first between the collectors of the three switching tubes and the emitter of the first switching tube.

The connection fault detection circuit also includes a fourth resistor, a fifth resistor and a sixth resistor, the fourth resistor is connected between the collector of the third switching tube and the base of the first switching tube, and the fifth resistor Connected between the base of the second switching tube and the emitter of the second switching tube, the sixth resistor is connected between the collector of the second switching tube and the anode of the primary of the second optocoupler between.

The connection failure detection circuit further includes a capacitor connected in parallel with the fourth resistor.

The connection failure detection circuit further includes a seventh resistor, an eighth resistor, and a ninth resistor, the seventh resistor is connected between the collector of the first optocoupler secondary and the positive pole of the second power supply, and the second The eight resistors are connected between the secondary collector of the second optocoupler and the positive pole of the second power supply, and the ninth resistor is connected between the base of the third switching tube and the core controller. between enable/reset control terminals.

The voltage of the first power supply is 24V, and the negative electrodes of the first power supply and the second power supply share a common ground.

The first switch tube and the third switch tube are NPN type, and the second switch tube is PNP type.

The point-type fire detector is a point-type smoke detector or a point-type heat detector.

The beneficial effects of the present invention are:

1. Due to the connection fault detection circuit formed by the first switch tube, the second switch tube, the regulator tube, the first optocoupler, the second optocoupler, the first power supply and the second power supply, the present invention can When a short-circuit or open-circuit fault occurs in the point-type fire detector, the states of the first optocoupler secondary and the second optocoupler secondary are changed by changing the states of the first switch tube, the second switch tube, and the voltage regulator tube, Thereby, the short-circuit and open-circuit faults of the point-type fire detectors are converted into digital signals respectively, and output to the core controller, so that the core controller can make accurate responses respectively; Misoperation occurs when the device is short-circuited or open-circuited;

2. The third switching tube is used to control the on-off state of the connection fault detection circuit, and the reset function of the point-type fire detector is also realized;

3. The increased first resistor, second resistor, and third resistor cooperate with the first switch tube, the second switch tube, the Zener tube, the first optocoupler, the second optocoupler, the first power supply and the second power supply The power supply also directly converts the normal working status of the point fire detectors into digital signals and outputs them to the core controller. output, and then processed into digital signals by complex circuits to the core controller), the circuit structure is simpler and the cost is lower.

The present invention will be described in further detail below with reference to the accompanying drawings and embodiments; however, a point type fire detector connection fault detection device of the present invention is not limited to the embodiments.

Description of drawings

Fig. 1 is a block diagram of the present invention;

Fig. 2 is a schematic diagram of the specific circuit connection of the connection failure detection circuit of the present invention.

Detailed ways

Embodiment, please refer to Fig. 1, shown in Fig. 2, a kind of point type fire detector connection fault detection device of the present invention, comprises point type fire detector 1, core controller 2 and connection fault detection circuit 3, this connection fault The detection circuit 3 includes a first switch tube T1, a second switch tube T2, a regulator tube DZ1, a first optocoupler U1, a second optocoupler U2, a first power supply and a second power supply, and a point type fire detector 1. The primary of the first optocoupler U1 and the base-emitter of the first switching tube T1 are connected in series between the two ends of the first power supply, and the secondary collector of the first optocoupler U1 is connected to the core controller 2 One of the signal input terminals DB0; the emitter-base of the second switching tube T2 and the regulator tube DZ1 are connected in series between the positive pole of the first power supply and the collector of the first switching tube T1, and the second switching tube T2 The collector is connected to the primary anode of the second optocoupler U2, the primary cathode of the second optocoupler U2 is grounded, and the secondary collector of the second optocoupler U2 is connected to another signal input terminal DB1 of the core controller 2; the first The primary of the optocoupler U1 and the second optocoupler U2 are powered by the first power supply, and the secondary (ie phototransistor) is powered by the second power supply.

As a preference, the above-mentioned connection fault detection circuit 3 also includes a third switch tube T3, the base of the third switch tube T3 is connected to the enable/reset control terminal EN of the core controller 2, and the collector of the third switch tube T3 The emitter of the first switching tube T1 is connected, and the emitter of the third switching tube T3 is connected to the negative pole of the first power supply.

As a preference, the connection fault detection circuit 3 further includes a first resistor R1, a second resistor R2 and a third resistor R3, the first resistor R1 is connected in parallel with the primary phase of the first optocoupler U1; the second resistor R2 The third resistor R3 is connected between the collector of the third switching tube T3 and the emitter of the first switching tube T1 .

The above connection fault detection circuit 3 also includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a capacitor C1, the fourth resistor R4 is connected between the collector of the third switching tube T3 and the base of the first switching tube T1 Between, the fifth resistor R5 is connected between the base of the second switching tube T2 and the emitter of the second switching tube T2, and the sixth resistor R6 is connected between the collector of the second switching tube T2 and the primary of the second optocoupler U2 between the anodes; the capacitor C1 is connected in parallel with the fourth resistor R4.

The connection fault detection circuit 3 also includes a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9, the seventh resistor R7 is connected between the secondary collector of the first optocoupler U1 and the positive pole of the second power supply, The eighth resistor R8 is connected between the secondary collector of the second optocoupler U2 and the positive pole of the second power supply, and the ninth resistor R9 is connected between the base of the third switching transistor T3 and the enable/ Between the reset control terminal EN.

The voltage of the first power supply is 24V, the voltage of the second power supply is 5V, and the negative poles of the first power supply and the second power supply share a common ground.

The first switching tube T1 and the third switching tube T3 are NPN type, and the second switching tube T2 is PNP type.

The above-mentioned point-type fire detector 1 is a point-type smoke detector or a point-type heat detector.

The above-mentioned core controller 2 may be a fire shutter core controller, or a main controller used in conjunction with point fire detectors in other systems. The core controller 2 can be various 8-bit and above single-chip microcomputer chips, such as PIC16F877, 89S52 and the like. The signal input ends of the core controller 2 are its two input/output pins.

A point-type fire detector connection failure detection device of the present invention, when the voltage V _EN of the enable/reset control terminal EN of the core controller 2 =+5V, the third switch tube T3 is turned on, and the point-type fire detector 1 Connect the third resistor R3 in series with the 24V power supply through the two PN junctions of the primary of the first optocoupler U1 and the base-emitter of the first switching tube T1, and the point fire detector 1 enters the working state; when the core controller 2 When the voltage V EN of the enabling/resetting control terminal _EN = 0V, the third switching tube T3 is cut off, and the point type fire detector 1 is powered off. At this time, the input/output pins DB0 and DB1 of the core controller 2 respectively output When the logic level is high, the core controller 2 responds as follows: the point fire detector 1 does not judge the fire situation and is in the reset state.

When the voltage V _EN of the enable/reset control terminal EN of the core controller 2 =+5V, the total circuit enters the working state. At this time, the four possible working states of the point fire detector 1 are as follows:

1. If there is an open-circuit connection failure between the point fire detector 1 and the core controller 2, the current I ₁ flowing through the point fire detector 1 is 0, and the first switching tube T1 is cut off, so that the current I1 flowing through the regulator tube DZ1 The current _I2 is also 0, so the currents of the primary (light-emitting diode) of the first optocoupler U1 and the primary (light-emitting diode) of the second optocoupler U2 are respectively 0, so that the secondary (light-emitting diode) of the first optocoupler U1 ( Phototransistor) and the secondary (phototransistor) of the second optocoupler U2 are cut off respectively, then the input/output pins DB0 and DB1 of the core controller 2 respectively input a logic high level, so that the core controller 2 corresponds to the following Response: Judgment point type fire detector 1 has an open circuit connection fault, and sends out an open circuit fault alarm signal.

2. If there is a short-circuit connection failure between the point fire detector 1 and the core controller 2, since the primary voltage (light-emitting diode voltage) of the first optocoupler U1 is about 1.1V, and the base-emitter voltage of the first switching tube T1 is about 0.7V, the collector-emitter voltage of the first switching tube T1 and the third switching tube T3 is about 0.2V, so I ₁ is equal to the voltage of the third resistor R3 (24-1.1-0.7-0.2=22V) and the third resistor R3 The ratio of the resistance value (3.9K ohm), that is, I ₁ ≈ 5.6mA, the potential U _b at the position of the collector of the first switch tube T1 is equal to the collector-emitter voltage of the first switch tube T1, the voltage of the third resistor R3 The sum of the voltage and the collector-emitter voltage of the third switch tube T3 is equal to 22.4V, so the voltage regulator tube DZ1 cannot be turned on, and I ₂ =0, so that the current flowing through the primary of the second optocoupler U2 is 0, The secondary of the second optocoupler U2 is cut off, and the input/output pin DB1 of the core controller 2 inputs a logic high level; since the current I _R1 flowing through the first resistor R1 is ≈1.1/2000=0.55mA, that is, I ₁ About 0.55mA is bypassed by the first resistor R1, and about 5.05mA flows through the primary of the first optocoupler U1, so the secondary of the first optocoupler U1 is saturated, and the input/output pin DB0 of the core controller 2 is input logic low. At this time, the core controller 2 responds as follows: judge that the point-type fire detector 1 has a short-circuit connection fault, and send a short-circuit fault alarm signal.

3. If there is no connection fault between the point fire detector 1 and the core controller 2 and there is no fire, the current flowing through the point fire detector 1 is less than 0.6mA, that is, I ₁ ≤ 0.6mA, and the current of I ₁ is basically The first resistor R1 is bypassed and does not flow through the primary of the first optocoupler U1, so the secondary of the first optocoupler U1 is cut off, and the input/output pin DB0 of the core controller 2 inputs a logic high level; the first The potential U _b at the position of the collector of the switch tube T1 is ≈0.2×2+I ₁ ×R ₃ <2.8V, the voltage across the second resistor R2 U _R2 ≈(24-U _b -0.7-3.3)V>17V, I ₂ =U _R2 /R ₂ >1.7mA, I ₂ is amplified by the second switch tube T2, drives the primary of the second optocoupler U2, and makes it conduct in saturation, then the secondary of the second optocoupler U2 conducts in saturation pass, the input/output pin DB1 of the core controller 2 inputs a logic low level. At this time, the core controller 2 responds as follows: it is judged that the point type fire detector 1 has no short circuit or open circuit connection fault, and no fire occurs at the detected position.

4. If there is no connection fault between point fire detector 1 and core controller 2 but there is a fire, then the voltage across the point fire detector 1 U _detector = 4.0 ~ 6.6V, and the voltage across the third resistor R3 is 24V Deduct the voltage of point type fire detector 1 from 4.0 to 6.6V, the primary voltage of the first optocoupler U1 is 1.1V, the base-emitter voltage of the first switching tube T1 is 0.7V, the collector-emitter voltage of the third switching tube T3 is 0.2V, That is, U _R3 ≈(24-U _detector -1.1-0.7-0.2)=15.4～18V, I ₁ ≈U _R3 /R ₃ =3.95～4.62mA, about 0.55mA of I ₁ is bypassed by the first resistor R1, Another 3.40-4.07mA flows through the primary of the first optocoupler U1, making the secondary of the first optocoupler U1 saturated and turned on, and the input/output pin DB0 of the core controller 2 inputs a logic low level. Since the sum of the emitter-base voltage of the second switching tube T2 of 0.7V, the voltage U _R2 across the second resistor R2, the voltage of 3.3V across the voltage regulator tube DZ1 and the collector-emitter voltage of the first switching tube T1 of 0.2V is equal to the fire The sum of the voltage across the detector (4.0-6.6V), the primary side voltage 1.1V of the first optocoupler U1 and the base-emitter voltage 0.7V of the first switching tube T1, so the voltage across the second resistor R2 U _R2 ≈(voltage at both ends of point fire detector 1+1.1+0.7-0.7-0.2-3.3)V=1.6～4.2V, I ₂ =U _R2 /R ₂ ＝0.16～0.42mA; I ₂ passes through the second switch tube T2 is amplified to drive the primary of the second optocoupler U2 to saturate and conduct the secondary of the second optocoupler U2, so that the input/output pin DB1 of the core controller 2 inputs a logic low level. At this time, the core controller 2 responds as follows: judge that the point-type fire detector 1 has no short-circuit or open-circuit connection fault, and a fire occurs at the detected position, and sends out a fire alarm signal.

The above four working states of the point-type fire detector 1 and the corresponding responses made by the core controller 2 (here, the various responses corresponding to the core controller can be realized by using the existing technology) are shown in the following table:

A point-type fire detector connection fault detection device of the present invention adopts the above-mentioned circuit structure, which not only meets the GA386-2002 core controller industry standard promulgated by the Ministry of Public Security, but also can detect short-circuit and open-circuit connection faults of point-type fire detectors. The information is output to the core controller to avoid malfunction of the core controller. It can also convert the current signal of the point fire detector into a logic level signal that the core controller can directly detect, making the whole circuit structure compared with the existing technology. , simpler and less costly. In addition, the present invention can also reset the alarm state of the point type fire detector.

The foregoing embodiments are only used to further illustrate a point-type fire detector connection fault detection device of the present invention, but the present invention is not limited to the embodiments, any simple modification made to the above embodiments according to the technical essence of the present invention, Equivalent changes and modifications all fall within the protection scope of the technical solutions of the present invention.

Claims (10)

1. a point type fire detector connects failure detector, comprise point type fire detector and core controller, it is characterized in that: also comprise the connection failure detector circuit, this connection failure detector circuit comprises the first switching tube, the second switch pipe, voltage-stabiliser tube, the first photo-coupler, the second photo-coupler, the first power supply and the second power supply, point type fire detector, the first photo-coupler elementary, base-the emitter-base bandgap grading of the first switching tube is connected in series between the two ends of the first power supply, the secondary colelctor electrode of the first photo-coupler connects a wherein signal input part of core controller, penetrate-the base stage of second switch pipe, voltage-stabiliser tube are connected in series between the colelctor electrode of anodal and the first switching tube of the first power supply, the colelctor electrode of second switch pipe connects the elementary anode of the second photo-coupler, the minus earth that the second photo-coupler is elementary, the secondary colelctor electrode of the second photo-coupler connects another signal input part of core controller, the elementary of the first photo-coupler and the second photo-coupler powered by the first power supply, secondary by the second power supply power supply.

2. point type fire detector according to claim 1 connects failure detector, it is characterized in that: described connection failure detector circuit also comprises the 3rd switching tube, the base stage of the 3rd switching tube connects the enable/reseting controling end of core controller, the colelctor electrode of the 3rd switching tube connects the emitter stage of described the first switching tube, and the emitter stage of the 3rd switching tube connects the negative pole of described the first power supply.

3. point type fire detector according to claim 2 connects failure detector, and it is characterized in that: described connection failure detector circuit also comprises the first resistance, and this first resistance is connected with elementary being in parallel of described the first photo-coupler.

4. connect failure detector according to the described point type fire detector of claim 2 or 3, it is characterized in that: described connection failure detector circuit also comprises the second resistance and the 3rd resistance, this second resistance is connected between the negative electrode of the base stage of described second switch pipe and described voltage-stabiliser tube, and the 3rd resistance is connected between the emitter stage of the colelctor electrode of described the 3rd switching tube and described the first switching tube.

5. point type fire detector according to claim 4 connects failure detector, it is characterized in that: described connection failure detector circuit also comprises the 4th resistance, the 5th resistance and the 6th resistance, the 4th resistance is connected between the base stage of the colelctor electrode of described the 3rd switching tube and described the first switching tube, the 5th resistance is connected between the emitter stage of the base stage of described second switch pipe and described second switch pipe, and the 6th resistance is connected between the colelctor electrode of described second switch pipe and the elementary anode of described the second photo-coupler.

6. point type fire detector according to claim 5 connects failure detector, and it is characterized in that: described connection failure detector circuit also comprises an electric capacity, and this electric capacity is in parallel and is connected with described the 4th resistance.

7. point type fire detector according to claim 2 connects failure detector, it is characterized in that: described connection failure detector circuit also comprises the 7th resistance, the 8th resistance and the 9th resistance, the 7th resistance is connected between the positive pole of the secondary colelctor electrode of described the first photo-coupler and described the second power supply, the 8th resistance is connected between the positive pole of the secondary colelctor electrode of described the second photo-coupler and described the second power supply, and the 9th resistance is connected between the enable/reseting controling end of the base stage of described the 3rd switching tube and described core controller.

8. point type fire detector according to claim 1 connects failure detector, and it is characterized in that: the voltage of described the first power supply is 24V, and the negative pole of described the first power supply and described the second power supply altogether.

9. point type fire detector according to claim 2 connects failure detector, and it is characterized in that: described the first switching tube and described the 3rd switching tube are the NPN type, and described second switch pipe is positive-negative-positive.

10. point type fire detector according to claim 1 connects failure detector, and it is characterized in that: described point type fire detector is spot-type smoke detector or point type heat fire detector.

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