CN203966280U - The power circuit of photoelectric smoke detector - Google Patents
The power circuit of photoelectric smoke detector Download PDFInfo
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- CN203966280U CN203966280U CN201420227040.5U CN201420227040U CN203966280U CN 203966280 U CN203966280 U CN 203966280U CN 201420227040 U CN201420227040 U CN 201420227040U CN 203966280 U CN203966280 U CN 203966280U
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- smoke detector
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- 239000000779 smoke Substances 0.000 title claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims abstract description 40
- 238000001914 filtration Methods 0.000 claims abstract description 12
- 238000002955 isolation Methods 0.000 claims abstract description 8
- 238000009825 accumulation Methods 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 11
- 238000010892 electric spark Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 235000019504 cigarettes Nutrition 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a kind of power circuit of photoelectric smoke detector, comprise luminous power circuit and receive power circuit; Luminous power circuit is made up of two-stage reverse isolation accumulation power supply, receives power circuit and is made up of integrated stable voltage circuit and two-stage RC filtering circuit.Luminous power circuit is made up of diode VD13, VD14, resistance R 13～R15, capacitor C 11, C12.Described reception power circuit is made up of capacitor C 13～C17, DC/DC transducer N2, stabilivolt VZ1, VZ2, resistance R 16～R18.Power circuit of the present utility model, has that voltage stability is high, antijamming capability is strong, have the advantages such as essential safety performance.
Description
Technical field
The utility model relates to a kind of power circuit of photoelectric smoke detector.
Background technology
In automatic fire alarm system, there is polytype fire detector: smoke detector, heat detector and flame detector etc.The smokescope that the smoke detector detection of fires stage of glowing produces is the most practical, effective product of realizing fire early detection.
Smoke detector can be divided into ionic smoke sensor, photoelectric smoke, infrared beam sense cigarette, air sampling sense cigarette etc. by principle of work, can be divided into intrinsic safety type and non-intrinsic safety type by environment for use.The applicable occasion of dissimilar detector is different, and intrinsic safety type smoke fire detector is mainly applicable to chemical industry, oil and pharmacy, semiconductor etc. and has explosive gas atmosphere place.According to GB3836 regulation, electric spark or thermal effect that whole circuit of intrinsic safety type electrical equipment produce under the test condition of regulation must not be lighted the explosive gas mixture of regulation.Current most widely used smoke detector is optical detector of fire smoke, (dutycycle is little to utilize infraluminescence pipe to send infrared pulse light, moment, glow current can reach hundreds of mA), utilize photosensitive receiving tube to receive the infrared light of smoke particle scattering, after use one-level or two stage amplifer circuit amplify signal, realize fire alarm and detect.
Fig. 2 is the power circuit diagram of the photoelectric smoke detector of prior art, and VB is illuminating circuit, receiving test circuit power supply, and C4 is storage capacitor (100uF or more than); VCC is MCU or special chip power supply, illuminating circuit and the receiving test circuit common source with larger enlargement factor.
The subject matter that prior art exists: power circuit output voltage in the time of the large galvanoluminescence of illuminating circuit produces fluctuation, signal amplification, output to highly sensitive testing circuit exert an influence, and increase luminous storage capacitor and power on and can produce dash current in the time of many detectors of bus connection; After having high input voltage to cause VT1, VT2 to puncture, bus can damage the amplifier of receiving test circuit.Large storage capacitor easily produces electric spark, cannot realize essential safety performance.
Utility model content
The utility model is the weak point existing in above-mentioned prior art for avoiding, and a kind of power circuit of photoelectric smoke detector is provided, to realize the essential safety performance of power supply high stability, strong anti-interference ability and detector.
The utility model be technical solution problem by the following technical solutions.
The power circuit of photoelectric smoke detector, comprises luminous power circuit and receives power circuit, its design feature is, described power circuit; Described luminous power circuit is made up of two-stage reverse isolation accumulation power supply, receives power circuit and is made up of integrated stable voltage circuit and two-stage RC filtering circuit; The output of the luminous power circuit first order is connected with the integrated stable voltage circuit input of second level input and reception power circuit, and integrated stable voltage circuit output is connected with the input of two-stage RC filtering circuit.
Described luminous power circuit is made up of diode VD13, VD14, resistance R 13～R15, capacitor C 11, C12.The negative pole of diode VD12 is connected with resistance R 13 one end, the R13 other end is connected with the input end of resistance R 14, diode VD14 positive pole, N2, the R14 other end is connected with capacitor C 11 is anodal, VD14 negative pole is connected with resistance R 15 one end, the R15 other end is connected with capacitor C 12 positive poles, illuminating circuit, the minus earth of capacitor C 11, C12.
Described reception power circuit is made up of capacitor C 13～C17, DC/DC transducer N2, stabilivolt VZ1, VZ2, resistance R 16～R18.The output terminal of DC/DC transducer N2 is connected with the negative pole of stabilivolt VZ1, VZ2, resistance R 16 one end, capacitor C 15, resistance R 17 one end, and the R16 other end is connected with capacitor C 14 is anodal, the negative pole of VZ1, VZ2, the minus earth of C14.
Resistance R 17 other ends are connected with resistance R 18 one end, capacitor C 16, and the R18 other end is connected with capacitor C 17, receiving test circuit.
Compared with the prior art, the utility model beneficial effect is embodied in:
The detection circuit of photoelectric smoke detector of the present utility model, power circuit comprises luminous power circuit and receives power circuit, the large electric current of the needs when luminous is provided by the tank circuit of luminous power second level diode-isolated, other parts power supply is not exerted an influence, improve power supply stability; Receive power circuit and adopt the series connection of integrated stable voltage circuit and two-stage RC filtering circuit, improved the anti-interference of power supply, can not damage receiving test circuit simultaneously when bus high input voltage; Increase essential safety holding circuit, can solve the deficiencies in the prior art.
The power circuit of photoelectric smoke detector of the present utility model, is particularly useful for automatic fire alarm system, has that power supply stability is high, antijamming capability is strong, have the advantages such as essential safety performance.
Brief description of the drawings
Fig. 1 is the circuit diagram of the power circuit of the utility model photoelectric smoke detector.
Fig. 2 is the circuit diagram of the intrinsic safety type photoelectric smoke detector of prior art.
Below pass through embodiment, and the utility model is described in further detail by reference to the accompanying drawings.
Embodiment
Referring to Fig. 1, the power circuit of photoelectric smoke detector, comprises luminous power circuit and receives power circuit; Luminous power circuit is made up of two-stage reverse isolation accumulation power supply, receives power circuit and is made up of integrated stable voltage circuit and two-stage RC filtering circuit.The output of the luminous power circuit first order is connected with the integrated stable voltage circuit input of second level input and reception power circuit, and integrated stable voltage circuit output is connected with the input of two-stage RC filtering circuit.
Nonpolarity circuit is made up of resistance R 11, R12, duodiode VD11, VD12.1 pin, 3 pin of VD11, VD12 are connected respectively, and 2 pin connect respectively R11, R12, and the other end of R11, R12 connects double bus.It is nonpolarity that bus input is realized on VD11, VD12 formation bridge road, prevents from causing device damage or cannot normally working because of wrong line.Current-limiting resistance R11, R12 are connected on respectively the input on bridge road, and when detector breaks down or carries out current limliting when short circuit, in the time there is overload, heating disconnects, and prevents that current anomaly from exerting an influence to bus.
Shown in Figure 1, luminous power circuit is made up of diode VD13, VD14, resistance R 13～R15, capacitor C 11, C12.The negative pole of diode VD12 is connected with resistance R 13 one end, the R13 other end is connected with the input end of resistance R 14, diode VD14 positive pole, N2, the R14 other end is connected with capacitor C 11 is anodal, VD14 negative pole is connected with resistance R 15 one end, the R15 other end is connected with capacitor C 12 positive poles, illuminating circuit, the minus earth of capacitor C 11, C12.VD13, R13, R14, C11 form first order reverse isolation accumulation power supply, and its output voltage is VA, and VD14, R15, C12 form second level reverse isolation accumulation power supply, and its output voltage is VB.
The pulsating volage high level that in bus, amplitude is 24V charges to electrochemical capacitor C11 (10～22uF) through nonpolarity circuit, isolating diode VD13, current-limiting resistance R13, the voltage VA of generation+21V left and right offers second level power supply and receives power circuit, R14 (100 Europe) prevents that C11 from producing electric spark, realizes essential safety performance; VD13 plays reverse isolation effect in the time that bus voltage is low level, prevents that C11 electric discharge from causing VA voltage drop.
Voltage VA charges to storage capacitor C12 (47uF) through isolating diode VD14, current-limiting resistance R15, produce stable+20V burning voltage VB and offer illuminating circuit, R15 (100 Europe) prevents that electrochemical capacitor C12 from producing electric spark, realizes essential safety performance; VD4 plays reverse isolation effect in the time of VA lower voltage, prevents that VA voltage fluctuation from exerting an influence to VB voltage, ensures the stable of illuminating circuit infraluminescence electric current, also avoids bus to produce dash current simultaneously.
Shown in Figure 1, receive power circuit and formed by capacitor C 13～C17, DC/DC transducer N2, stabilivolt VZ1, VZ2, resistance R 16～R18.The output terminal of DC/DC transducer N2 is connected with the negative pole of stabilivolt VZ1, VZ2, resistance R 16 one end, capacitor C 15, resistance R 17 one end, and the R16 other end is connected with capacitor C 14 is anodal, the negative pole of VZ1, VZ2, the minus earth of C14.Resistance R 17 other ends are connected with resistance R 18 one end, capacitor C 16, and the R18 other end is connected with capacitor C 17, receiving test circuit.
Capacitor C 13～C14, DC/DC transducer N2, stabilivolt VZ1, VZ2, resistance R 16 form integrated stable voltage circuit, and its output voltage is VDD; Resistance R 17 (10k), R18 (1M), capacitor C 16 (10n), C17 (100p) composition two-stage RC filtering circuit, its output voltage is VC.
Voltage VA is as the input of DC/DC transducer N2, N2 employing+3V or+5V voltage stabilizing chip, capacitor C 11, C13 and C14, C15 composition N2 I/O filtering circuit, make to export vdd voltage and there is higher stability, offer MCU or special chip and RC filtering circuit.Voltage stabilizing diode VZ1, VZ2 parallel connection have realized vdd voltage intrinsic safety " ia " hierarchical protection, and R16 (100 Europe) prevents that electrochemical capacitor C14 from producing electric spark.
Voltage VCC disturbs and carries out exporting highly stable voltage VC after RC filtering circuit different frequency range through the two-stage of resistance R 17～R18, capacitor C 16～C17 composition, offers photosensitive receiving tube and the amplifier of receiving test circuit.In the time of bus input instant high-voltage, due to the protection of current-limiting resistance R13, voltage stabilizing diode VZ1, VZ2 and resistance R 17, R18, the amplifier of N2 and receiving test circuit can not be damaged.
Although the utility model is illustrated hereinbefore according to preferred embodiment, this does not represent that scope of the present utility model is confined to above-mentioned structure, as long as the structure being covered by the utility model claim is all within protection domain.Those skilled in the art are reading the equivalent substitution structure that can develop easily after above-mentioned explanation, and equalization variation and the modification under the spirit that does not depart from the utility model and scope, done, within all should being covered by the utility model protection domain.
Claims (3)
1. the power circuit of photoelectric smoke detector, comprises luminous power circuit and receives power circuit, it is characterized in that described power circuit; Described luminous power circuit is made up of two-stage reverse isolation accumulation power supply, receives power circuit and is made up of integrated stable voltage circuit and two-stage RC filtering circuit; The output of the luminous power circuit first order is connected with the integrated stable voltage circuit input of second level input and reception power circuit, and integrated stable voltage circuit output is connected with the input of two-stage RC filtering circuit.
2. the power circuit of photoelectric smoke detector according to claim 1, is characterized in that, described luminous power circuit is made up of diode VD13, VD14, resistance R 13～R15, capacitor C 11, C12; The negative pole of diode VD12 is connected with resistance R 13 one end, the R13 other end is connected with the input end of resistance R 14, diode VD14 positive pole, N2, the R14 other end is connected with capacitor C 11 is anodal, VD14 negative pole is connected with resistance R 15 one end, the R15 other end is connected with capacitor C 12 positive poles, illuminating circuit, the minus earth of capacitor C 11, C12.
3. the power circuit of photoelectric smoke detector according to claim 1, is characterized in that, described reception power circuit is made up of capacitor C 13～C17, DC/DC transducer N2, stabilivolt VZ1, VZ2, resistance R 16～R18; The output terminal of DC/DC transducer N2 is connected with the negative pole of stabilivolt VZ1, VZ2, resistance R 16 one end, capacitor C 15, resistance R 17 one end, and the R16 other end is connected with capacitor C 14 is anodal, the negative pole of VZ1, VZ2, the minus earth of C14;
Resistance R 17 other ends are connected with resistance R 18 one end, capacitor C 16, and the R18 other end is connected with capacitor C 17, receiving test circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420227040.5U CN203966280U (en) | 2014-05-05 | 2014-05-05 | The power circuit of photoelectric smoke detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420227040.5U CN203966280U (en) | 2014-05-05 | 2014-05-05 | The power circuit of photoelectric smoke detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203966280U true CN203966280U (en) | 2014-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420227040.5U Expired - Fee Related CN203966280U (en) | 2014-05-05 | 2014-05-05 | The power circuit of photoelectric smoke detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203966280U (en) |
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2014
- 2014-05-05 CN CN201420227040.5U patent/CN203966280U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141126 |