CN106066446A - A kind of multichannel analog amount input circuit break detection circuit and method - Google Patents
A kind of multichannel analog amount input circuit break detection circuit and method Download PDFInfo
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- CN106066446A CN106066446A CN201610498657.4A CN201610498657A CN106066446A CN 106066446 A CN106066446 A CN 106066446A CN 201610498657 A CN201610498657 A CN 201610498657A CN 106066446 A CN106066446 A CN 106066446A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention discloses a kind of multichannel analog amount input circuit break detection circuit and method, including analog input signal multichannel multiplex circuit, break detection circuit and microprocessor；Analog input signal multichannel multiplex circuit includes multiple input channel circuit, each input channel circuit all includes the light coupling relay being connected with microprocessor, microprocessor control light coupling relay is to open input channel circuit, and analog input is accessed and measures in loop by light coupling relay；Break detection circuit includes analog switch, constant-current source, constant pressure source and voltage comparator；Analog switch is connected with microprocessor, analog input signal multichannel multiplex circuit respectively；Constant pressure source is connected with the end of oppisite phase of voltage comparator；The in-phase end of voltage comparator is connected with analog switch；Voltage comparator is connected with microprocessor.The present invention gradually carries out burn out detection one by one by multichannel multiplex technique on the premise of ensureing original function and significantly reduces design cost each analog input channel.
Description
Technical field
The invention belongs to electric power chemical field, a kind of multichannel analog amount being specifically related in scattered control system inputs back
Road break detection circuit and method.
Background technology
Along with scattered control system is in thermoelectricity and the extensive application of chemical industry, the functional requirement to scattered control system
More and more higher, for the measurement of in-site modeling amount signal, need whether the detection input circuit to each passage is real-time breaks, with
Judge that whether correct current measurement value and by this feedback of status to upper work station；Burn out detection function fills for analog measurement
Putting most important, traditional method is that each passage is increased independent burn out detection device, and this device increasing a lot of manufacturers becomes
This, the most more efficiently burn out detection function of design multichannel analog amount input circuit is particularly important.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of multichannel analog amount input circuit break detection circuit and method.
Realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
A kind of multichannel analog amount input circuit break detection circuit, including analog input signal multichannel multiplexing electricity
Road, break detection circuit and microprocessor U3；Described analog input signal multichannel multiplex circuit includes multiple input channel
Circuit, each input channel circuit all includes the light coupling relay being connected with microprocessor U3, by microprocessor U3 output control
The unlatching signal of a system wherein input channel is to light coupling relay to open this input channel circuit, and light coupling relay is by analog quantity
Input accesses measures in loop, and after being measured, microprocessor U3 closes this light coupling relay；Described break detection circuit includes
Analog switch U1, constant-current source, constant pressure source and voltage comparator U2；The input of analog switch U1 is connected with microprocessor, and it is defeated
Go out end to be connected with analog input signal multichannel multiplex circuit by multichannel multiplexing line；Constant-current source is for breaking for whole loop
Line detection provides electric current；Constant pressure source is connected with the end of oppisite phase of voltage comparator U2；The in-phase end of voltage comparator U2 is opened with simulation
The outfan closing U1 connects；The outfan of voltage comparator is connected with microprocessor.
Described each input channel circuit all comprises two light coupling relay, the control end signal string of two light coupling relay
Connection, one terminates supply voltage, and another terminates microprocessor U3, the analog signals that a termination scene of light coupling relay is sent here,
The outfan of another termination analog switch U1, controls the switch of light coupling relay by microprocessor U3.
Described analog switch U1 is dual pathways single-pole single-throw switch (SPST), and 2 inputs control 2 switches, respectively when simulation is opened
When pass U1 receives high level signal, switching Guan Bi accordingly, corresponding output end signal interconnects, otherwise then disconnects.
One of them output of described analog switch U1 is for connecting the light corresponding to constant-current source and analog signals positive pole
The drain electrode output of coupling relay, another output of analog switch U1 connects the light coupling relay leakage corresponding to analog signals negative pole
Pole exports, and by resistance R1 and resistance R2 ground connection.
The in-phase end of described voltage comparator U2 is connected between resistance R1 and resistance R2, and outfan is connected to microprocessor
U3。
A kind of multichannel analog amount input circuit wire break detection method, comprises the following steps:
The low level signal of a wherein input channel is controlled to light coupling relay to open this by microprocessor U3 output
Input channel circuit；
When microprocessor U3 output high level signal is to analog switch U1 input, the corresponding outfan of analog switch U1
Guan Bi, constant-current source forms return current by in-site modeling amount input channel；By voltage comparator U2 detection input circuit electricity
Press to judge that no existence breaks.
Described by voltage comparator U2 detection input circuit voltage to judge that no existence breaks particularly as follows: return current stream
Crossing R1, R2, when the voltage when between R1 and R2 is more than the voltage of end of oppisite phase, then voltage comparator U2 is output as high level, represents
Input circuit does not break；When input circuit breaks, and electric current cannot flow through R1 and R2, will necessarily cause in-phase end input is 0, low
In backward end voltage, voltage comparator U2 is output as low level.
Beneficial effects of the present invention:
The present invention provides a kind of multichannel analog amount input circuit break detection circuit and method, it is possible to realize existing efficiently
The circuit breaking detection of field multi-analog signal, this invention can be applied to the scattered control system of electric power, chemical field
In design and application, the reliability service for electric power, chemical industry provides technical support, logical on the premise of ensureing original function
Too much channel multiplexing technology gradually carries out burn out detection one by one and significantly reduces design cost each analog input channel.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of the present invention.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, to the present invention
It is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not used to
Limit the present invention.
Below in conjunction with the accompanying drawings the application principle of the present invention is explained in detail.
A kind of multichannel analog amount input circuit break detection circuit, including analog input signal multichannel multiplexing electricity
Road, break detection circuit and microprocessor U3；
Described analog input signal multichannel multiplex circuit includes multiple input channel circuit, and each input channel circuit is equal
Including the light coupling relay being connected with microprocessor U3, by the unlatching signal of a microprocessor U3 output wherein input channel
To open this input channel circuit, opening signal in a preferred embodiment of the invention is low level signal；See in Fig. 1,
U4A, U4B, U5A, U5B ..., U6A, U6A are light coupling relay, IN1+, IN1-, IN2+, IN2-..., INN+, INN-
It is respectively the positive and negative terminal of analog input channel circuit 1, the positive and negative terminal ... of input channel circuit 2, input channel circuit N
Positive and negative terminal；
Described break detection circuit includes analog switch U1, constant-current source, constant pressure source and voltage comparator U2；
One of them output of described analog switch U1 is for connecting the light corresponding to constant-current source and analog signals positive pole
The drain electrode output of coupling relay, another output of analog switch U1 will connect the light coupling relay corresponding to analog signals negative pole
Drain electrode output, and the in-phase end of voltage comparator U2 it is connected to by resistance R1 and resistance R2 dividing potential drop.
Constant-current source is for providing electric current for analog input loop, and constant pressure source is connected with the end of oppisite phase of voltage comparator U2,
The input of analog switch U1 and the outfan of voltage comparator are all connected with microprocessor U3, are detected by voltage comparator U2
The voltage of input channel circuit is to judge whether broken string.
In the present invention, described each input channel circuit includes two light coupling relay, the control of two light coupling relay
End signal is connected, a termination power source voltage Vcc, and another terminates microprocessor U3, and a termination scene of light coupling relay is sent here
Analog signals, the outfan of another termination analog switch U1, constitute multichannel multiplexing line；IN1Select、
IN2Select ..., INNSelect are microprocessor U3 output signal, and the most only allowing one of them output signal is low electricity
Flat, when for low level, represent that this road analog signals is input to multiplex on line.
Described analog switch U1 is dual pathways single-pole single-throw switch (SPST), and 2 inputs control 2 switches, respectively when simulation is opened
When pass U1 receives high level signal, switching Guan Bi accordingly, corresponding output end signal interconnects, otherwise then disconnects.
One of them output of described analog switch U1 is for connecting the light corresponding to constant-current source and analog signals positive pole
The drain electrode output of coupling relay, another output of analog switch U1 will connect the light coupling relay corresponding to analog signals negative pole
Drain electrode output is by resistance R1 and resistance R2 ground connection.
The in-phase end of described voltage comparator U2 is connected between resistance R1 and resistance R2, and outfan is connected to microprocessor
U3。
In a preferred embodiment of the invention, light coupling relay is switch mosfet, and analog switch is cmos switch.
To sum up, the operation principle of a kind of embodiment of the present invention is as follows:
When the IN1Select of microprocessor U3 output is low level, the input signal that analog switch U1 receives is high electricity
At ordinary times, constant-current source flows out the electric current of setting value by IN1+, is returned by IN1-, and the electric current of return flows through R1, R2, if now R1
With the voltage between R2 is more than voltage comparator U2 end of oppisite phase voltage now, then voltage comparator U2 is output as high level, represents
Input circuit does not break；If input circuit breaks, electric current cannot flow through R1 and R2, will necessarily cause voltage comparator U2 homophase
End input is 0, and less than backward end voltage, voltage comparator U2 is now output as low level.
A kind of multichannel analog amount input circuit wire break detection method, comprises the following steps:
The control end being enabled a wherein passage light coupling relay by microprocessor U3 output is that low level is defeated to open this
Enter channel circuit；
When microprocessor U3 output high level signal is to analog switch U1, analog switch U1 exports Guan Bi, believes accordingly
Number interconnect, constant-current source provide electric current by input channel loop formed return current；
By voltage comparator U2 detection input circuit voltage to judge that no existence breaks.
By voltage comparator U2 detection input circuit voltage to judge that the no broken string that exists is particularly as follows: return current flows through
R1, R2, when the voltage when between R1 and R2 is more than the voltage of voltage comparator U2 end of oppisite phase, then voltage comparator U2 is output as height
Level, represents that input circuit does not break；When input circuit breaks, and electric current cannot flow through R1 and R2, will necessarily cause voltage ratio
The input of relatively device U2 in-phase end is 0, and less than voltage comparator U2 backward end voltage, voltage comparator U2 is output as low level.
Embodiment one
Utilize signal generator output 40mv signal to inputting each signal input channel circuit I N1+, IN1-, IN2+, IN2-
And on other input channel circuit, 8 input circuits of design, first carry out burn out detection to signal input channel circuit 1 altogether,
Arranging IN1Select is low level, and the input signal arranging analog switch U1 is high level, resistance R1, R2 be respectively 100K,
200K, constant-current source arranges and is output as 10uA current signal, and it is 1.18V that constant pressure source exports its value, when input channel circuit 1 just connects
Chang Shi, now the electric current of constant-current source flows out from IN1+, returns from IN1-and flows through resistance R1, R2, calculating voltage comparator U2
The voltage of in-phase end is 2V, more than end of oppisite phase voltage, therefore output high level；When input channel circuit 1 breaks, voltage comparator
The voltage of U2 in-phase end is 0V, therefore output low level, microprocessor U3 judges to be currently entered passage electricity by the height of level
Whether road 1 exists broken string, and after having detected, arranging IN1Select is the detection that high level closes input channel circuit 1, arranges
IN2Select is the burn out detection that low level proceeds input channel circuit 2, and process is similar to input channel circuit 1, above-mentioned
The case verification present invention can carry out burn out detection to multichannel input signal.
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described.The technology of the industry
Personnel, it should be appreciated that the present invention is not restricted to the described embodiments, simply illustrating this described in above-described embodiment and description
The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, and these become
Change and improvement both falls within scope of the claimed invention.Claimed scope by appending claims and
Equivalent defines.
Claims (7)
1. a multichannel analog amount input circuit break detection circuit, it is characterised in that: include analog input signal manifold
Road multiplex circuit, break detection circuit and microprocessor U3；Described analog input signal multichannel multiplex circuit includes multiple
Input channel circuit, each input channel circuit all includes the light coupling relay being connected with microprocessor U3, passes through microprocessor
U3 output controls the unlatching signal of a wherein input channel to light coupling relay to open this input channel circuit, light coupling relay
Being accessed by analog input measures in loop, and after being measured, microprocessor U3 output shutdown signal closes this light coupling relay；
Described break detection circuit includes analog switch U1, constant-current source, constant pressure source and voltage comparator U2；The input of analog switch U1
Being connected with microprocessor U3, its outfan is connected with analog input signal multichannel multiplex circuit by multichannel multiplexing line；
Constant-current source is for providing electric current for the detection of whole circuit breaking；Constant pressure source is connected with the end of oppisite phase of voltage comparator U2；Voltage ratio
The relatively in-phase end of device U2 is connected with the outfan of analog switch U1；The outfan of voltage comparator is connected with microprocessor U3.
A kind of multichannel analog amount input circuit break detection circuit the most according to claim 1, it is characterised in that: described
Each input channel circuit all comprises two light coupling relay, the control end signal series connection of two light coupling relay, a termination power
Voltage, another terminates microprocessor U3；The analog signals that one termination scene of light coupling relay is sent here, another termination simulation is opened
Close the outfan of U1, controlled the switch of light coupling relay by microprocessor U3.
A kind of multichannel analog amount input circuit break detection circuit the most according to claim 1 and 2, it is characterised in that:
Described analog switch U1 is multichannel single-pole single-throw switch (SPST), and 2 inputs control 2 switches respectively, when analog switch U1 receives
During to high level signal, switching Guan Bi accordingly, corresponding output end signal interconnects, otherwise then disconnects.
A kind of multichannel analog amount input circuit break detection circuit the most according to claim 2, it is characterised in that: described
One of them output of analog switch U1 is for connecting the light coupling relay drain electrode corresponding to constant-current source and analog signals positive pole
Output, another output of analog switch U1 connects the light coupling relay drain electrode output corresponding to analog signals negative pole, and leads to
Cross resistance R1 and resistance R2 ground connection.
A kind of multichannel analog amount input circuit break detection circuit the most according to claim 4, it is characterised in that: described
The in-phase end of voltage comparator U2 is connected between resistance R1 and resistance R2, and outfan is connected to microprocessor U3.
6., according to a kind of multichannel analog amount input circuit wire break detection method described in Arbitrary Term in Claims 1 to 5, it is special
Levy and be, comprise the following steps:
The unlatching signal of a wherein input channel is controlled logical to open this input to light coupling relay by microprocessor U3 output
Road circuit；
When microprocessor U3 output high level signal is to analog switch U1 input, the corresponding outfan of analog switch U1 closes
Closing, constant-current source forms return current by in-site modeling amount input channel；Input circuit voltage is detected by voltage comparator U2
To judge that no existence breaks.
A kind of multichannel analog amount input circuit wire break detection method the most according to claim 6, described in pass through voltage ratio
Compared with device U2 detection input circuit voltage to judge the no electricity existing and breaking particularly as follows: return current flows through R1, R2, when between R1 and R2
When pressure is more than the voltage of end of oppisite phase, then voltage comparator U2 is output as high level, represents that input circuit does not break；Work as input
Circuit breaking, electric current cannot flow through R1 and R2, and will necessarily cause in-phase end input is 0, less than backward end voltage, voltage comparator
U2 is output as low level.
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| CN108646126A (en) * | 2018-04-16 | 2018-10-12 | 常州科研试制中心有限公司 | Line sequence detection device |
| CN109445375A (en) * | 2018-12-28 | 2019-03-08 | 中电智能科技有限公司 | PLC redundant system and PLC redundancy approach |
| CN109507612A (en) * | 2018-12-28 | 2019-03-22 | 中电智能科技有限公司 | Analog acquisition card and fault detection method |
| CN109828219A (en) * | 2019-03-21 | 2019-05-31 | 奇瑞新能源汽车技术有限公司 | A kind of electric automobile power battery insulation detecting circuit |
| CN109960240A (en) * | 2017-12-26 | 2019-07-02 | 宁波菲仕电机技术有限公司 | Wire breakage detector and method based on MCU analog interface wiring |
| CN110687373A (en) * | 2019-09-30 | 2020-01-14 | 上海御渡半导体科技有限公司 | Detection structure and method of ATE system |
| CN112098902A (en) * | 2020-08-31 | 2020-12-18 | 贵州天义电器有限责任公司 | Multichannel load on-off state acquisition circuit based on 28V DC power circuit |
| WO2023207279A1 (en) * | 2022-04-24 | 2023-11-02 | 南京科远智慧科技集团股份有限公司 | Disconnection diagnosis apparatus and method for digital quantity output loop |
| CN117110946A (en) * | 2023-10-25 | 2023-11-24 | 西安热工研究院有限公司 | Analog signal output broken line detection circuit |
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| CN112098902A (en) * | 2020-08-31 | 2020-12-18 | 贵州天义电器有限责任公司 | Multichannel load on-off state acquisition circuit based on 28V DC power circuit |
| WO2023207279A1 (en) * | 2022-04-24 | 2023-11-02 | 南京科远智慧科技集团股份有限公司 | Disconnection diagnosis apparatus and method for digital quantity output loop |
| CN117110946A (en) * | 2023-10-25 | 2023-11-24 | 西安热工研究院有限公司 | Analog signal output broken line detection circuit |
| CN117110946B (en) * | 2023-10-25 | 2024-01-23 | 西安热工研究院有限公司 | Analog signal output broken line detection circuit |
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Application publication date: 20161102 |