CN107274644A - A kind of method for detecting fire-fighting bus capacitive size - Google Patents
A kind of method for detecting fire-fighting bus capacitive size Download PDFInfo
- Publication number
- CN107274644A CN107274644A CN201710687382.3A CN201710687382A CN107274644A CN 107274644 A CN107274644 A CN 107274644A CN 201710687382 A CN201710687382 A CN 201710687382A CN 107274644 A CN107274644 A CN 107274644A
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- CN
- China
- Prior art keywords
- fire
- level
- bus
- size
- fighting bus
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/02—Monitoring continuously signalling or alarm systems
- G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults
Abstract
The invention discloses a kind of method for detecting fire-fighting bus capacitive size, including：(1) level threshold is set in fire-fighting bus, wherein, more than threshold value it is for low level below high level, threshold value；(2) fire alarm control unit issues waveforms detection instruction, and its value is A；(3) in a code period of fire-fighting bus, if the return value of intelligent parts is B, according to tan θ=(A B)/hVXThe slope of high level is calculated, and obtains the size of angle theta, the numerical values recited of the angle theta is the capacitive size for representing fire-fighting bus；Described code period pulse width between level rising edge for the pulse width between level trailing edge twice or twice；0 ＜ B≤A；hVXThe ordinate of level waveforms is represented, it is fixed given value.The present invention is that wiring distance and node are laid and provide reference, reduces the expenditure of hardware cost and human cost on the premise of the response speed and stability of fire alarm control system is ensured, it is to avoid the waste of resource.
Description
Technical field
The present invention relates to technical field of fire control, and in particular to be it is a kind of detect fire-fighting bus capacitive size method.
Background technology
At present, in fire alarm control system, because impedance is inevitably present, appearance can be there is in fire-fighting bus
Property, and with the growth of wiring distance, its capacitive can be increasing.Influence of the capacitive to whole fire alarm control system is very
Substantially, it is in particular in that distortion can occur for the communication signal in bus between fire alarm control unit and intelligent parts, causes whole
The response speed and stability of individual fire alarm control system are affected, and intelligent parts can not be fully according to fire alarming and controlling
The instruction of device is operated, and fire alarm control unit also can not accurately receive the feedback of intelligent parts.
In this regard, the solution that prior art is used is usually to be connected up from the larger copper cash of sectional area, or
It is to shorten wiring distance, and increases the arrangement of controller (i.e. control node), so as to controls influence of the impedance to communication signal.This
Although kind of a mode can reduce the influence of capacitive, technological means is more coarse, and it is (to select larger section to sacrifice hardware cost
The copper cash of area and increase controller) and human cost (multinode laying) solve problem as precondition, and some
When, existing this mode can easily cause the waste of resource (for example control node is laid excessive).
Why above mentioned problem is present, to find out its cause, being primarily due to do not have a kind of feasible technological means at present
Detect the capacitive size of fire-fighting bus.If the capacitive size in fire-fighting bus can be accurately known, for copper cash cross section
For selection, wiring distance and the node of size are laid, it will be a very reliable preposition guarantee, so as to ensure fire
On the premise of the response speed and stability of alarm control system, the expenditure of hardware cost and human cost is reduced, and avoids money
Source is wasted.
The content of the invention
It is an object of the invention to provide a kind of method for detecting fire-fighting bus capacitive size, fire alarming and controlling is being ensured
On the premise of the response speed and stability of system, select, wiring distance and node are laid and provide reference, reduce for copper cash size
The expenditure of hardware cost and human cost, it is to avoid the waste of resource.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of method for detecting fire-fighting bus capacitive size, comprises the following steps：
(1) level threshold is set in fire-fighting bus, wherein, prefabricated is above high level, is low level below threshold value, and
Described level threshold represents the abscissa of level waveforms；
(2) fire alarm control unit issues waveforms detection to intelligent parts by fire-fighting bus and instructed, and its detected value is A；
(3) in a code period of fire-fighting bus, if the return value of intelligent parts is B, according to formula：Tan θ=
(A-B)/hVXThe slope of high level more than threshold value is calculated, and obtains the size of angle theta, the numerical values recited of the angle theta is table
Show the capacitive size of fire-fighting bus, and -90 ＜ θ ＜ 90；Described code period fills width for the arteries and veins between level trailing edge twice
Degree or the twice pulse width between level rising edge；Described B≤A；Described hVXThe ordinate of level waveforms is represented, it is
Fixed given value.
Compared with prior art, the invention has the advantages that：
(1) present invention is 201710113010X, invention and created name based on number of patent application：A kind of fire-fighting industrial bus
Technical scheme described in coding method, the code period (pulse width or two between level trailing edge twice designed by it
Pulse width between secondary level rising edge) in, issue detected value and intelligence by given threshold, and according to fire alarm control unit
The difference of the return value of energy part, calculates high level slope, corresponding corner dimension is obtained, then with this angle
Numerical values recited represents the capacitive of bus, so as to obtain the capacitive size of bus.The present invention is introduced in fire-fighting bus in a creative way
The calculating of waveform slope, and the capacitive of fire-fighting bus is represented with the numerical values recited of angle, so as to obtain fire-fighting bus in real time
Current capacitive size, and while fire-fighting bus capacitive is calculated, due to being present invention employs number of patent application
201710113010X coding techniques, thus have no effect on the normal communication between fire alarm control unit and intelligent parts.
(2) the invention provides a kind of standard of fire alarm control system wiring, the technical staff of technical field of fire control
, only need to be by calculating fire-fighting without being judged again by experience in terms of carrying out copper cash and selecting with wiring distance setting
The current capacitive size of bus, you can determine the copper cash and wiring distance and node from appropriate cross section area according to actual needs
Lay, it is entirely avoided different technical staff is because experience differs and causes wire laying mode differentiation occur.The present invention is obtained
The capacitive size obtained is very accurate, the blank filled up well in industry, is ensuring the response speed of fire alarm control system
On the premise of degree and stability, it can be selected for copper cash, wiring distance and node are laid and provide important evidence and reference, so as to subtract
The expenditure of few hardware cost and human cost, and the unnecessary wasting of resources is avoided, and then realize dynamic between technology and cost
State is balanced.
Brief description of the drawings
Fig. 1 is schematic flow sheet of the invention.
Fig. 2 is a kind of oscillogram shown in the specific embodiment of the invention.
Embodiment
The invention will be further described with embodiment for explanation below in conjunction with the accompanying drawings, and mode of the invention includes but not only limited
In following examples.
The invention provides a kind of method that can accurately detect fire-fighting bus capacitive size, it is intended in for copper cash cross section
Size select, wiring distance and node are laid and provide important evidence and reference, as shown in figure 1, present invention detection fire-fighting bus
The flow of capacitive size is as follows：
(1) level threshold V is set in fire-fighting busX, wherein, more than threshold value it is high level, is low level below threshold value,
And described level threshold represents the abscissa of level waveforms；
(2) fire alarm control unit issues waveforms detection to intelligent parts by fire-fighting bus and instructed, and its detected value is A；
(3) fire-fighting bus a code period (code period for level trailing edge twice between pulse width or
Pulse width between level rising edge twice) in, if the return value of intelligent parts is B (low level pulse width, B≤A), then
According to formula：Tan θ=(A-B)/hVXCalculate slope (the described h of high level more than threshold valueVXRepresent the vertical of level waveforms
Coordinate, it is fixed given value, is preset by fire alarm control system), and obtain the size of angle theta, the numerical value of the angle theta
Size is the capacitive size for representing fire-fighting bus.
In above-mentioned steps, according to the features of shape of waveform, θ span is -90 ＜ θ ＜ 90.
The present invention by studying the shape (as shown in Figure 2) of waveform, and based on number of patent application be 201710113010X,
The design philosophy that invention and created name is illustrated by a kind of fire-fighting industrial bus coding method, given threshold and determine height electricity
After flat, using fire alarm control unit send waveforms detection instruction, intelligent parts return instruction difference, with reference to high level slope
Calculating, accurately obtain the sizes values of fire-fighting bus capacitive.According to mode of the present invention, the technology of technical field of fire control
Personnel are in terms of carrying out copper cash and selecting with wiring distance setting, without being judged again by experience, only need to be by calculating
The current capacitive size of fire-fighting bus, you can according to actual needs determine from much cross-sectional areas copper cash and wiring distance and
Node is laid, so as to reduce the expenditure of hardware cost and human cost, it is to avoid the wasting of resources.Each flow ring ring phase of the invention
Button, is closely connected, the true capacitive value of fire-fighting bus is obtained well, has filled up the blank of industry, science, reasonably refines
Solve the technological means of relevant issues.Further say, how the present invention even can also reduce fire-fighting bus appearance to be follow-up
Property research rational reference frame and design direction are provided, so as to gradually form a kind of new system and standard.Therefore, this hair
It is bright that there is prominent substantive distinguishing features and significant progress.
Above-described embodiment is only one of the preferred embodiment of the present invention, should not be taken to limit the protection model of the present invention
Enclose, as long as the present invention body design thought and mentally make have no the change of essential meaning or polishing, it is solved
Technical problem it is still consistent with the present invention, should be included in protection scope of the present invention within.
Claims (1)
1. a kind of method for detecting fire-fighting bus capacitive size, it is characterised in that comprise the following steps：
(1) level threshold is set in fire-fighting bus, wherein, prefabricated is above high level, is low level below threshold value, and described
Level threshold represent the abscissas of level waveforms；
(2) fire alarm control unit issues waveforms detection to intelligent parts by fire-fighting bus and instructed, and its detected value is A；
(3) in a code period of fire-fighting bus, if the return value of intelligent parts is B, according to formula：Tan θ=(A-
B)/hVXThe slope of high level more than threshold value is calculated, and obtains the size of angle theta, the numerical values recited of the angle theta is that expression disappears
The capacitive size of anti-bus, and -90 ＜ θ ＜ 90；Described code period for the arteries and veins between level trailing edge twice fill width or
Pulse width between level rising edge twice；Described B≤A；Described hVXThe ordinate of level waveforms is represented, it is fixation
Given value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710687382.3A CN107274644A (en) | 2017-08-11 | 2017-08-11 | A kind of method for detecting fire-fighting bus capacitive size |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710687382.3A CN107274644A (en) | 2017-08-11 | 2017-08-11 | A kind of method for detecting fire-fighting bus capacitive size |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107274644A true CN107274644A (en) | 2017-10-20 |
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| CN201710687382.3A Pending CN107274644A (en) | 2017-08-11 | 2017-08-11 | A kind of method for detecting fire-fighting bus capacitive size |
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Citations (5)
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|---|---|---|---|---|
| JP2005207911A (en) * | 2004-01-23 | 2005-08-04 | Toppan Printing Co Ltd | Characteristic impedance inspection device for circuit wiring board |
| CN1842712A (en) * | 2001-09-06 | 2006-10-04 | 东京毅力科创株式会社 | Impedance measuring circuit, its method, and capacitance measuring circuit |
| CN102055171A (en) * | 2009-11-06 | 2011-05-11 | 索尼公司 | Electric power supply device, electric power receiving device, electric power supply system, and failure recovery method |
| WO2015195019A1 (en) * | 2014-06-19 | 2015-12-23 | Telefonaktiebolaget L M Ericsson (Publ) | Estimation of impedances in a transmission medium |
| CN106896270A (en) * | 2015-12-19 | 2017-06-27 | 联芯科技有限公司 | A kind of measuring method of transmission line impedance |
-
2017
- 2017-08-11 CN CN201710687382.3A patent/CN107274644A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1842712A (en) * | 2001-09-06 | 2006-10-04 | 东京毅力科创株式会社 | Impedance measuring circuit, its method, and capacitance measuring circuit |
| JP2005207911A (en) * | 2004-01-23 | 2005-08-04 | Toppan Printing Co Ltd | Characteristic impedance inspection device for circuit wiring board |
| CN102055171A (en) * | 2009-11-06 | 2011-05-11 | 索尼公司 | Electric power supply device, electric power receiving device, electric power supply system, and failure recovery method |
| WO2015195019A1 (en) * | 2014-06-19 | 2015-12-23 | Telefonaktiebolaget L M Ericsson (Publ) | Estimation of impedances in a transmission medium |
| CN106471748A (en) * | 2014-06-19 | 2017-03-01 | 瑞典爱立信有限公司 | The estimation of the impedance in transmission medium |
| CN106896270A (en) * | 2015-12-19 | 2017-06-27 | 联芯科技有限公司 | A kind of measuring method of transmission line impedance |
Non-Patent Citations (2)
| Title |
|---|
| 谢昱昊: ""基于AD5933的阻抗测量系统设计与实验研究"", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
| 黄乘顺等: ""传输线阻抗匹配模型及精确计算"", 《通信技术》 * |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171020 |
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| RJ01 | Rejection of invention patent application after publication |