CN1186749C - Temp sensing fire detector possessing automatic debug function and method for automatic debug - Google Patents

Temp sensing fire detector possessing automatic debug function and method for automatic debug Download PDF

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Publication number
CN1186749C
CN1186749C CNB031127819A CN03112781A CN1186749C CN 1186749 C CN1186749 C CN 1186749C CN B031127819 A CNB031127819 A CN B031127819A CN 03112781 A CN03112781 A CN 03112781A CN 1186749 C CN1186749 C CN 1186749C
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microprocessor
circuit
voltage
temperature
comparator circuit
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CN1431632A (en
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窦征
王殊
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Abstract

The present invention relates to a temperature sensing detector with an automatic debugging function, which belongs to the technical field of fire prevention. One end of all resistors of an adjusting resistance network is connected to the reference end of a comparison circuit, and the other end of all the resistors of the adjusting resistance network is respectively connected with corresponding control openings of a microprocessor in the temperature sensing fire detector which is mainly composed of the microprocessor, a data memory, a signal properly adjusting circuit, a temperature sensor, a reference circuit, etc. The microprocessor orderly changes the equivalent resistance values of the adjusting resistance network by gradually changing the states of all the control openings under an alarm temperature, and an adjusting process is finished until the voltage of the reference end of the comparison circuit is higher than the voltage of a temperature signal end, which is converted into the voltage of the reference end lower than the voltage of the temperature signal end. The states of all the control openings of the microprocessor are stored into the data memory to be used as called running states during actual running. A debugging process of the present invention is completely and automatically finished by a program of the microprocessor, the batch debugging of the detector can be simultaneously carried out, and therefore, the present invention is laborsaving and timesaving. The production cost of a product is lowered, and the quality of the product is favourably ensured.

Description

Heat fire detector and automatic debugging method with automatic debug function
Technical field
The present invention relates to a kind of fire detector and adjustment method thereof, specifically a kind of heat detector with automatic debug function, and the automatic debugging method of this heat detector belong to the fire prevention field.
Background technology
Heat fire detector is by the measures ambient temperature detection of fires.In the process of making heat fire detector, must debug alarm temperature, make its error be no more than the scope of technical standard order.This debugging generally realizes by the parameter value of adjusting electronic component with manual method at present, therefore wastes time and energy.
The present invention does not for convenience of explanation at first have temperature and adjusts the heat fire detector of function automatically and be described shown in Figure 1.
Among Fig. 1, U1 is the interface of detector to the control display; U2 is the mu balanced circuit of detector; U3 is the microprocessor as detector control core; U4 is a comparator circuit, and it has two input ends, and one is signal end, the output terminal of the suitable demodulation circuit U6 of jointing temp signal, and another is reference edge A, connects the adjustment end of reference circuit; Resistance R 2, R3, potentiometer RP1 form reference circuit, and the travelling arm of potentiometer RP1 is the reference edge A of the adjustment termination comparator circuit U4 of reference circuit; U5 is the storer that is used for data storage; U6 is the suitable demodulation circuit of temperature signal, and its circuit gain is by resistance R 9 and R10 decision; Resistance R 4 and temperature-sensing element D2 constitute temperature sensing circuit; Light emitting diode D1 and its resistance in series R1 constitute the affirmation circuit of reporting to the police.
Be one with temperature-sensing element among Fig. 1 to have-diode of 2mV/ ℃ forward voltage drop temperature coefficient is an example; the temperature of its forward voltage drop reflection detector place guard space, forward voltage drop are delivered to the signal end of comparator circuit U4 through the suitable demodulation circuit U6 of signal as temperature signal.Under the normal monitoring state, the signal end voltage of comparator circuit U4 always is higher than reference edge A voltage, so comparer U4 output low level.Because temperature-sensitive diode D2 forward voltage drop has negative temperature coefficient, rising along with environment temperature, the output voltage of the suitable demodulation circuit U6 of signal reduces gradually, when environment temperature reaches alarm temperature, the output voltage of the suitable demodulation circuit U6 of signal, be the voltage that the signal end voltage of comparator circuit U4 will be lower than reference edge A, the output terminal output voltage of comparator circuit U4 will become high level by low level, this state variation is after microprocessor U3 confirms, the circuit output voltage pulse is confirmed in the warning of constituting for D1 and R1, light emitting diode D1 is glittering, and microprocessor U3 exports fire alarm signal by interface circuit U1 to the control indicator simultaneously.
In the above-mentioned heat fire detector circuit, the temperature scale of sensing element D2 itself, the voltage stabilizing value of mu balanced circuit U2, all there are deviation in comparator circuit U4, the suitable demodulation circuit U6 of signal, resistance R 4, R5 and R6 characterisitic parameter, thereby also there is deviation in the temperature signal that comparator circuit U4 is obtained, the effect of the reference circuit that R2, R3, RP1 form promptly is the reference edge voltage that is used for adjusting comparator circuit U4, to compensate above-mentioned deviation.
The above is the ultimate principle that general heat detector carries out the temperature debugging.This debugging is undertaken by manual method under certain alarm temperature, wastes time and energy unavoidably, and has artificial factor.
Summary of the invention
The objective of the invention is to: at the problem of existing heat fire detector manual debugging existence, a kind of heat fire detector that relies on internal circuit can finish debugging is automatically proposed, provide this heat detector method of debugging automatically simultaneously, thereby make adjustment work time saving and energy saving, reduce the production cost, guarantee product quality.
In order to reach above purpose, the technical scheme that the present invention has the heat fire detector of automatic debug function is (referring to Fig. 2), mainly by control/display interface device (U1), mu balanced circuit (U2), microprocessor (U3), comparator circuit (U4), data-carrier store (U5), signal is fitted demodulation circuit (U6), in the heat fire detector that temperature sensing circuit (D2) and reference circuit are formed, reference circuit is by two above resistance (R5, R6, R7, R8 etc.) the adjustment resistor network of being formed, control mouth (the P1 of microprocessor (U3) respective numbers, P2, P3, P4 etc.) and divider resistance (R2, R3) form, an end of each resistance is all received on the reference edge (A) of comparator circuit (U4) in the described resistor network, the other end is received microprocessor (U3) control corresponding mouth (P1 respectively, P2, P3, P4 etc.) on, the mid point of divider resistance (R2 and R3) is received on the reference edge (A) of comparator circuit (U4).
The automatic debugging step of heat fire detector of the present invention is:
A1, under alarm temperature, by progressively changing microprocessor (U3) each control mouthful (P1, P2, P3, P4 etc.) state changes the equivalent resistance of adjusting resistor network (R5, R6, R7, R8 etc.) in order, progressively adjusts the voltage of comparator circuit (U4) reference edge (A);
A2, be higher than signal end voltage when comparator circuit (U4) reference edge (A) voltage, when the voltage that comparator circuit (U4) output terminal is delivered to microprocessor (U3) P5 mouth is high level, continue steps A 1;
A3, transfer to and be lower than signal end voltage by being higher than signal end voltage when comparator circuit (U4) reference edge (A) voltage, when the voltage that comparator circuit (U4) output terminal is delivered to microprocessor (U3) P5 mouth changes low level into by high level, state that will each control of microprocessor this moment (U3) mouthful deposits storer (U5) in, the running status of each control of microprocessor (U3) of the time calling as work mouthful.
The present invention constitutes reference circuit with the adjustment resistor network of two above resistance (R5, R6, R7, R8) composition and the corresponding potentiometer RP1 that controls in mouthful (P1, P2, P3, P4) the replacement prior art (Fig. 1) of microprocessor (U3) with divider resistance R2, R3.The state of each control mouthful (P1, P2, P3, P4) of microprocessor (U3) has two kinds: a kind of is the low-resistance output state, is equivalent to the resistance eutral grounding that is attached thereto; Another kind is a high resistant input attitude, is equivalent to the resistance that is attached thereto unsettled.Therefore, microprocessor (U3) can change the magnitude of voltage of comparator circuit (U4) reference edge (A) point by the state that changes control mouthful (P1, P2, P3, P4), thereby compensates the temperature signal deviation that the part characteristic parameter error causes.
Automatically debugging is carried out under alarm temperature.Adjustment can be adopted the method for exhaustion, also can adopt other algorithm.When adopting the method for exhaustion, arrange from big to small by adjusting the resistor network equivalent resistance, will adjust the corresponding resistance of resistor network successively and receive on reference edge (A) point of comparator circuit (U4).When reference edge (A) point voltage is adjusted to a certain desired value, the voltage that is reference edge (A) transfers to and is lower than signal end voltage by being higher than signal end voltage, when the voltage that the output terminal of comparator circuit (U4) is delivered to microprocessor P5 mouth is transformed into low level by high level, adjustment process promptly comes to an end, and this moment, the state of each control mouthful (P1, P2, P3, P4) was deposited in storer (U5).The control mouth state operation that detector is remembered by storer (U5) when reality is used.
Because above-mentioned debug process of the present invention is finished by the microprocessor programming Control fully, therefore debugging work is carried out automatically, and can carry out batch to a plurality of detectors adjusts automatically, efficient obviously improves, accuracy also improves, and is time saving and energy saving, reduced production cost of products, avoid artificial factor, more helped guaranteeing product quality.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is the schematic diagram of existing heat fire detector.
Fig. 2 is the automatic debugging partial circuit schematic diagram of the embodiment of the invention one.
Fig. 3 is the automatic debugging partial circuit schematic diagram of the embodiment of the invention two.
Embodiment
Embodiment one
The heat fire detector of present embodiment (Fig. 2) comprises following each several part: control/display interface device U1; Mu balanced circuit U2; Microprocessor U3; Comparator circuit U4; Data-carrier store U5; Signal is fitted demodulation circuit U6; By adjusting resistor network R5, R6, R7, R8, the control mouth P1 of microprocessor U3, P2, P3, P4, the reference circuit that divider resistance R2, R3 constitute; Temperature sensing circuit D2, R4; Report to the police and confirm circuit D1, R1.The signal end "-" of comparator circuit U4 connects the output terminal of the suitable demodulation circuit U6 of signal among Fig. 2, and reference edge "+" connects reference circuit adjustment end, i.e. the mid point A of divider resistance R2, R3 (not shown with the similar part of prior art).
Replace the potentiometer RP1 among Fig. 1 with the adjustment resistor network of R5, R6, R7, R8 composition and P1, P2, P3, the P4 mouth of little processing U3 among Fig. 2, constitute reference circuit with divider resistance R2, R3.Before address, P1, P2, P3, P4 mouth state have two kinds: a kind of is the low-resistance output state, is equivalent to the resistance eutral grounding that is attached thereto; Another kind is a high resistant input attitude, is equivalent to the resistance that is attached thereto unsettled.Microprocessor can change the magnitude of voltage that comparator circuit U4 reference edge A is ordered by the state of control P1, P2, P3, P4 mouth, thus the temperature signal deviation that compensation part characteristic parameter error causes.
The method of exhaustion is adopted in the automatic debugging of present embodiment, arranges from big to small by adjusting the resistor network equivalent resistance, will adjust the corresponding resistor of resistor network R5, R6, R7, R8 successively and receive on the reference edge A point of comparator circuit U4.When reference edge A point voltage is adjusted to a certain desired value, the voltage that is reference edge A transfers to and is lower than signal end voltage by being higher than signal end voltage, when the voltage that the output terminal of comparator circuit U4 is delivered to little processing P5 mouth was transformed into low level by high level, adjustment process promptly came to an end.P1, P2, P3, P4 mouth state are at this moment deposited in storer U5.The mouth state operation that detector is remembered by storer U5 when reality is used.
Now specify automatic debug process as follows:
Adjustment had for 16 steps.In the 1st step, all adjustment mouthful (P1-P4) of microprocessor U3 are the input high-impedance state, and it is all unsettled to be equivalent to all adjustment resistance.In the 2nd step, microprocessor U3 is changed to the low-resistance output state to the P1 mouth, and P2, P3, P4 mouth are changed to high resistant input attitude, and R5 (240K) promptly is grounded like this, is parallel on the R3 (30K), and the reference edge A point voltage of adjusting circuit U 4 is reduced.The 3rd step was that the P2 mouth is changed to the low-resistance output state, and P1, P3, P4 mouth are changed to high resistant input attitude, and R6 (120K) promptly is grounded like this, is parallel on the R3 (30K), and reference edge A point voltage is further reduced.The 4th step was that P1 and P2 mouth are changed to the low-resistance output state, and P3 and P4 mouth are changed to high resistant input attitude, and like this, R5 (240K) and R6 (120K) promptly are parallel on the R3 (30K), and reference edge A point voltage is reduced once more.In the whole adjustment process, the equivalent resistance of the state of P1, P2, P3, P4 mouth and adjustment resistor network is as shown in table 1.When dropping to, comparator circuit U4 reference edge A point voltage is lower than its signal end voltage, its output terminal is that voltage on the microprocessor U3 P5 mouth is during by high step-down, adjustment process promptly comes to an end, the state of each control mouthful (P1, P2, P3, P4) of microprocessor (U3) is satisfied quilt and is deposited in storer (U5), pilot lamp D1 can a certain characteristic frequency glimmer simultaneously, and for example glittering 1 the prompting adjustment of per second was finished already.If until the 16th step, the voltage of comparator circuit U4 reference edge A still is higher than signal end voltage, pilot lamp D1 can another characteristic frequency glimmer, and for example per 10 seconds glittering 1 time, points out the component parameters deviation of this detector to surpass adjustable scope.If when the 1st step, the voltage of comparator circuit U4 reference edge A just has been lower than signal end voltage, pilot lamp D1 can be different from a certain specific frequency scintillation of aforementioned frequency, for example 3 seconds glittering 1 time, points out the component parameters deviation of this detector to surpass adjustable scope on another direction.
Table 1 is adjusted the state of mouth and is adjusted the equivalence value of resistor network
Step P1 P2 P3 P4 The equivalence value of R5 R6 R7 R8
1 × × × × ∞
2 0 × × × 240k
3 × 0 × × 120k
4 0 0 × × 80k
5 × × 0 × 60k
6 0 × 0 × 48k
7 × 0 0 × 40k
8 0 0 0 × 34.3k
9 × × × 0 30k
10 0 × × 0 26.7k
11 × 0 × 0 24k
12 0 0 × 0 21.8k
13 × × 0 0 20k
14 0 × 0 0 18.5k
15 × 0 0 0 17.1k
16 0 0 0 0 16k
Annotate: *---high resistant input attitude, 0---the low-resistance output state.
The quantity of adjusting resistor network resistance among Fig. 2 can be 2～6 or more, depends on desired adjustment precision, and its resistance is pressed scale-of-two and selected, as shown in Figure 2, and R5=2R6, R6=2R7, R7=2R8 etc.
Experiment showed, the programmed control by microprocessor U3, debugging work is carried out fully automatically.During practical operation, can carry out batch to a plurality of detectors and automatically adjust, so efficient obviously improves, accuracy also improves.
Embodiment two
The heat fire detector of present embodiment is referring to Fig. 3 (not shown with the similar part of Fig. 1), this embodiment can regard a derived scheme of the present invention as, in the heat fire detector of mainly being made up of display interface device U1, mu balanced circuit U2, the microprocessor U3 that has A/D converter, data-carrier store U5, signal suitable demodulation circuit U6, temperature sensing circuit D2, the output signal of the suitable demodulation circuit U6 of signal is directly delivered to the A/D input port P of microprocessor U3.
The self-adjusting principle of present embodiment is: corresponding a certain temperature, temperature signal voltage on the P mouth always has a theoretical expected value, if the virtual voltage on this mouth departs from this desired value, then calculate deviation value by microprocessor U3, deposit this deviation value in storer U5 then, be worth as the modified value in the actual motion with this.Specifically, microprocessor U3 control is finished automatic debugging according to following steps:
B1, deposit the theoretical expected value of temperature signal on the A/D input port under the specified temp in data-carrier store (U5);
B2, measure the actual voltage value of A/D input port under this specified temp;
B3, the actual voltage value that records is compared with the theoretical expected value under this specified temp, calculate deviation value;
B4, deposit the deviation value that calculates in data-carrier store (U5), the offset that calls during as real work.
For example the signal voltage theoretical expected value on the U3P mouth is 2.00V in the time of 50 ℃, as make P mouth signal voltage in fact have only 1.91V because of circuit component characterisitic parameter deviation, so little processing U3 just deposits (2.00-1.91) V=0.09V in storer U5 as modified value.Detector all adds modified value 0.09V to the actual value that records when measuring temperature at every turn under actual working state.Microprocessor U3 will carry out fire and judge on the basis of the temperature value that was corrected.Because the temperature signal voltage on P mouth under arbitrary temperature is all to there being a theoretical expected value, therefore above adjustment automatically can be carried out under arbitrary temp.
In addition to the implementation, the present invention can also have other embodiments.For example, temperature-sensing element D2 can be the responsive to temperature diode, also can be thermistor or other temperature-sensing element (device).All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of requirement of the present invention.

Claims (5)

1. heat fire detector with automatic debug function, mainly by control/display interface device (U1), mu balanced circuit (U2), microprocessor (U3), comparator circuit (U4), data-carrier store (U5), signal is fitted demodulation circuit (U6), temperature sensing circuit (D2) and reference circuit are formed, it is characterized in that: reference circuit is by two above resistance (R5, R6, R7, R8 etc.) the adjustment resistor network of being formed, microprocessor (U3) respective numbers control mouthful (P1, P2, P3, P4 etc.) and divider resistance (R2, R3) form, an end of each resistance is all received on the reference edge (A) of comparator circuit (U4) in the described adjustment resistor network, the other end is received microprocessor (U3) control corresponding mouth (P1 respectively, P2, P3, P4 etc.) on, the mid point of divider resistance (R2 and R3) is received on the reference edge (A) of comparator circuit (U4).
2. according to the described heat fire detector of claim 1, it is characterized in that: described resistor network by arrange from big to small, the resistance of 2 times of relations is formed each other.
3. according to claim 1 or 2 described heat fire detectors, it is characterized in that: the temperature-sensing element of described temperature sensing circuit (D2) is responsive to temperature diode or thermistor.
4. according to the automatic debugging method of the described heat fire detector of claim 1, it is characterized in that: described microprocessor (U3) is finished automatic debugging according to following controlled step:
A1, under alarm temperature, by progressively changing microprocessor (U3) each control mouthful (P1, P2, P3, P4 etc.) state changes the equivalent resistance of resistor network (R5, R6, R7, R8 etc.) in order, progressively adjusts the voltage of comparator circuit (U4) reference edge (A);
A2, be higher than signal end voltage when the voltage of comparator circuit (U4) reference edge (A), when the voltage that comparator circuit (U4) output terminal is delivered to microprocessor (U3) is high level, continue steps A l;
A3,, comparator circuit (U4) reference edge (A) voltage is lower than signal end voltage when being reduced to, when the voltage that comparator circuit (U4) output terminal is delivered to microprocessor (U3) changes low level into by high level, state that will each control of microprocessor this moment (U3) mouthful deposits storer (U5) in, the running status of each control of microprocessor (U3) of the time calling as work mouthful.
5. automatic debugging method of heat fire detector, in the heat fire detector of mainly forming by display interface device (U1), mu balanced circuit (U2), the microprocessor (U3) that has A/D converter, data-carrier store (U5), the suitable demodulation circuit (U6) of signal, temperature sensing circuit (D2), it is characterized in that: the output signal that described signal is fitted demodulation circuit (U6) is directly delivered to the A/D input port (P) of microprocessor (U3), and described microprocessor (U3) is finished automatic debugging according to following controlled step:
B1, deposit the theoretical expected value of A/D input port (P) under the specified temp in data-carrier store (U5);
B2, measure the actual voltage value of A/D input port (P) under this specified temp;
B3, the actual voltage value that records is compared with the theoretical expected value under this specified temp, calculate deviation value;
B4, deposit the deviation value that calculates in data-carrier store (U5), the offset that calls during as real work.
CNB031127819A 2003-01-28 2003-01-28 Temp sensing fire detector possessing automatic debug function and method for automatic debug Expired - Fee Related CN1186749C (en)

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CN1186749C true CN1186749C (en) 2005-01-26

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CN101806643B (en) * 2010-03-17 2012-10-10 沪东中华造船(集团)有限公司 Method for debugging low-temperature sensor monitoring system matched with ship
CN104240466B (en) * 2013-06-20 2016-08-10 五冶集团上海有限公司 Benzene hydrogenation engineering fire warning system adjustment method
CN105405423B (en) * 2015-12-15 2019-01-15 深圳市华星光电技术有限公司 Gate drive apparatus and its array substrate
CN115096348B (en) * 2022-08-26 2022-11-22 成都晨电智能科技有限公司 Full-bridge temperature drift compensation circuit and method and strain sensing system

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