CN109709373A - A kind of signal adaptive Acquisition Circuit and acquisition method - Google Patents
A kind of signal adaptive Acquisition Circuit and acquisition method Download PDFInfo
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- CN109709373A CN109709373A CN201811580104.9A CN201811580104A CN109709373A CN 109709373 A CN109709373 A CN 109709373A CN 201811580104 A CN201811580104 A CN 201811580104A CN 109709373 A CN109709373 A CN 109709373A
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Abstract
The invention discloses a kind of signal adaptive Acquisition Circuit and acquisition method, which includes: control level generation module, for generating initial low and high level；Signal input interface is used for input voltage or current signal；Voltage and current adaptation module, connection control level generation module and signal input interface, the level for being generated according to control level generation module change the resistance value size of itself, and then change the voltage value at signal input interface both ends；Signal condition and Acquisition Circuit, connection signal input interface judge the type of input signal for voltage-type or current mode signal for acquiring the voltage value at signal input interface both ends, and by comparing the voltage value acquired.The present invention can avoid out shell configuration, reduce and burn circuit hidden danger, improve user experience.
Description
Technical field
The present invention relates to embedded hardware fields, more particularly to a kind of signal adaptive Acquisition Circuit and acquisition method
Background technique
Currently, with advances in technology, the sensor used in modern plant is more and more, the acquisition demand of sensor
It is increasing.And common sensor acquisition module or can only one of collection voltages signal or current signal at present；?
Voltage or current mode signal can be supported to acquire, but need to configure by way of opening casing and jumper cap is arranged, be inconvenient.
In the more especially sensor concentrated collection of number of sensors, it is easy to occur current mode signal accessing voltage acquisition module
Or the mistake of voltage mode signals access current acquisition module, it can especially be made when current mode signal accesses voltage acquisition module
It is overloaded at current sensor, and then damages sensor device.
Summary of the invention
In view of the above technical problems, the present invention provides the circuit and acquisition method of a kind of signal adaptive acquisition.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: a kind of signal adaptive Acquisition Circuit,
The circuit includes:
Level generation module is controlled, for generating initial low and high level；
Signal input interface is used for input voltage or current signal；
Voltage and current adaptation module connects the control level generation module and signal input interface, for according to institute
It states the level that control level generation module generates and changes the resistance value size of itself, and then change the signal input interface both ends
Voltage value；
Signal condition and Acquisition Circuit connect the signal input interface, for acquiring the signal input interface both ends
Voltage value, and by comparing acquire voltage value judge the type of input signal for voltage-type or current mode signal.
In order to solve the above technical problems, another technical solution used in the present invention is: a kind of signal adaptive acquisition side
Method, this method comprises:
Control level generation module generates initial low and high level；
Signal input interface input voltage or current signal；
Voltage and current adaptation module is big according to the resistance value that the level that the control level generation module generates changes itself
It is small, and then change the voltage value at the signal input interface both ends；
Signal condition and Acquisition Circuit acquire the voltage value at the signal input interface both ends, and by comparing the electricity acquired
Pressure value judges the type of input signal for voltage-type or current mode signal.
The beneficial effects of the present invention are: the low and high level generated by control level generation module, changes the input letter
Resistance value between number interface cooperates rear class signal condition and Acquisition Circuit to read corresponding voltage value, and then according to voltage-type
Corresponding voltage value different Variation Features when resistance change between input signal interface of signal and current mode signal, to sentence
Disconnected input signal types.Implementation through the invention can avoid out shell configuration, reduce and burn circuit hidden danger, improve user experience.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of signal adaptive Acquisition Circuit provided in an embodiment of the present invention；
Fig. 2 is that a kind of the first, second relay of signal adaptive Acquisition Circuit provided in an embodiment of the present invention is closed
When equivalent circuit；
Fig. 3 be a kind of signal adaptive Acquisition Circuit provided in an embodiment of the present invention the first relay disconnect, second after
Equivalent circuit when electric appliance is closed；
Fig. 4 is a kind of flow diagram of signal adaptive acquisition method provided in an embodiment of the present invention.
Specific embodiment
Further more detailed description is made to technical solution of the present invention With reference to embodiment.Obviously, it is retouched
The embodiment stated is only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention,
Those of ordinary skill in the art's every other embodiment obtained without creative labor, all should belong to
The scope of protection of the invention.
Fig. 1 is a kind of structural schematic diagram of signal adaptive Acquisition Circuit provided in an embodiment of the present invention.
As shown in Figure 1, the signal adaptive Acquisition Circuit includes: control level generation module 120, signal input interface
130 and voltage and current adaptation module 110.
Wherein, level generation module 120 is controlled, for generating initial low and high level.
Specifically, the control level generation module can be deployed on terminal CPU by optocoupler, when CPU needs to judge letter
When number type, triggers its specified pin output phase and answer level.
Signal input interface 130 is used for input voltage or current signal.
Specifically, voltage or current signal can be industrial sensor normal voltage current signal, which is on pcb board
5.08mm connecting terminal interface.
Voltage and current adaptation module 110 connects the control level generation module 120 and signal input interface 130, uses
Change the resistance value size of itself in the level generated according to the control level generation module 120, and then it is defeated to change the signal
The voltage value at 130 both ends of incoming interface.
Specifically, voltage and current adaptation module 110 can realize itself resistance value by accessing different divider resistance modes
The change of size.
Signal condition and Acquisition Circuit 140, connect the signal input interface, for acquiring the signal input interface
The voltage value at 130 both ends, and judge the type of input signal for voltage-type or current mode signal by comparing the voltage value acquired.
Specifically, when load changes, voltage is constant for voltage sensor；For amperometric sensor, load changes
Electric current is constant when change, therefore can be compared by acquiring voltage value twice respectively, when voltage change is larger, class signal
Type is current mode, and when voltage change is little, signal type is voltage-type.
A kind of signal adaptive Acquisition Circuit provided in an embodiment of the present invention, the height generated by control level generation module
Low level changes the resistance value between the input signal interface, cooperates rear class signal condition and Acquisition Circuit to read corresponding
Voltage value, and then according to relevant voltage when resistance change between input signal interface of voltage mode signals and current mode signal
It is worth different Variation Features, to judge input signal types.Implementation through the invention can avoid out shell configuration, reduce and burn electricity
Road hidden danger improves user experience.
Optionally, in this embodiment, as shown in Figure 1, the voltage and current adaptation module 110 includes the first partial pressure electricity
Hinder the 111, second divider resistance 112, the first relay 113, the second relay 114,111, second points of first divider resistance
It is connect respectively with 130 both ends of signal input interface after the series connection of the outlet side of piezoresistance 112 and the second relay 114, it is described
The control side both ends of second relay 114 are connect with one end 121 of the control level generation module 120 and power Vcc respectively,
The outlet side of first relay 113 is in parallel with the first divider resistance 111, the control side both ends of first relay 113
It is connect respectively with the other end 122 of the control level generation module 120 and power Vcc；
When the both ends of the control level generation module 120 generate high level, first relay 113 and second
The outlet side of relay 114 is connected, and the signal condition and Acquisition Circuit 140 read the first of the signal input interface both ends
Voltage value U1；When is produced from one end 121 that the control level generation module 120 is connect with the control side of first relay 113
Raw high level, when the other end 122 connecting with the control side of second relay 114 generates low level, first relay
The outlet side of device 113 disconnects, and the outlet side conducting of second relay 114, the signal condition and Acquisition Circuit 140 are read
The second voltage value U2 at 130 both ends of signal input interface, and by comparing the first voltage value U1 and second voltage value
U2 judges the type of input signal for voltage-type or current mode signal.
Specifically, normally closed relay, the system power supply can be selected in first relay 113 and the second relay 114
Vcc can be 5V or 12V, and the control level generation module high level is corresponding with Vcc level, low level 0V, wherein the
One relay 113 and the second relay 114 all have following characteristic: when there is electric current to flow through control side, the actuating of relay, and relay
Device outlet side disconnects.Therefore, when the control level generation module 121 or 122 exports low level, the actuating of relay is defeated
Side disconnects out；When exporting high level, relay resets, outlet side closure.
When system needs to judge signal type, CPU controls the control level generation module 121 and 122 first and exports
High level, first relay 113 and the second relay 114 reset at this time, and relay outlet side is closed, at this time system etc.
Circuit is imitated as shown in Fig. 2, because rear class signal condition and Acquisition Circuit impedance are larger, it is believed that the signal input interface
Resistance is equal to the second divider resistance resistance value R02 between 130Signal-P and Signal-N, when access signal type is
When current mode, voltage U_1=I*R02 between Signal-P and Signal-N.When input signal types are voltage-type,
Voltage U_1=U between Signal-P and Signal-N；Secondly, CPU, which controls the control level generation module 121, exports low electricity
Flat, 122 remain unchanged.At this time equivalent circuit as shown in figure 3, between Signal-P and Signal-N resistance be equal to R01 and
The sum of R02, when signal is current mode, voltage U_2=I* (R01+R02) between Signal-P and Signal-N, when signal is
When voltage-type, voltage U_2=U between Signal-P and Signal-N.For voltage sensor, when load changes, voltage
It is constant；For amperometric sensor, electric current is constant when load changes, therefore can be carried out by acquiring voltage value twice respectively
Compare, when voltage change is larger, signal type is current mode, and when voltage change is little, signal type is voltage-type.
Optionally, in this embodiment, the voltage and current adaptation module 110 further include respectively with the first relay
113, the first freewheeling diode 115 and the second freewheeling diode 116 of the control side parallel connection of the second relay 114.
Specifically, by setting the first freewheeling diode 115 and the second freewheeling diode 116, can in the actuating of relay,
The electric current that can be released in electromagnetic coil relay.
Optionally, in this embodiment, the control level generation module 120, be also used to according to the signal condition and
The type for the input signal that Acquisition Circuit 110 judges generates corresponding low and high level.
Specifically, control level generation module exports different electricity according to signal type when judging input signal types
Ordinary mail number makes Acquisition Circuit be in optimum state to optimize circuit impedance.Such as: when judging signal for voltage-type, port
122 keep low level, to disconnect the second divider resistance 112, increase circuit input impedance；When judging signal for current mode
When, port 122 keeps high level, and port 121 keeps low level, thus the second divider resistance 112 of access, by acquiring this resistance
Upper voltage obtains current value.
It is a kind of flow diagram of the method for signal adaptive acquisition provided in an embodiment of the present invention refering to Fig. 4, Fig. 4.
As shown in figure 4, this method comprises:
S210, control level generation module generate initial low and high level；
Specifically, then reading voltage value is remembered as shown in Figure 1, control level generation module 121,122 exports high level
Make U1, control level generation module 122 keeps high level constant, then 121 output low levels read voltage value and are denoted as U2.
Control level generation module 120 can be deployed on terminal CPU by optocoupler.When needing to judge signal type,
CPU generates the low and high level needed by optocoupler.Specifically, the high level generated is consistent with system power supply Vcc, low level is
0V。
S220, signal input interface input voltage or current signal；
S230, voltage and current adaptation module change the resistance of itself according to the level that the control level generation module generates
It is worth size, and then changes the voltage value at the signal input interface both ends；
S240, signal condition and Acquisition Circuit acquire the voltage value at the signal input interface both ends, and adopt by comparing
The voltage value integrated judges the type of input signal as voltage-type or current mode signal.
Specifically, comparing the voltage value U1 and U2 of twi-read, if U1 and U2 are not much different, illustrate electricity when input signal
Die mould illustrates that input signal is current mode if difference is larger.
As shown in Figure 2 and Figure 3.Because rear class signal condition and Acquisition Circuit impedance are larger, it is believed that the signal input connects
Resistance is respectively equal to R02 and R01+R02 between mouth 130Signal-P and Signal-N.
Amperometric sensor is equivalent to current source within the scope of its load capacity, and voltage sensor is in its load capacity model
Voltage source is equivalent in enclosing.Therefore, when input signal is voltage-type, although the impedance of the isoboles 2 and isoboles 3 becomes
Change, but voltage value is basically unchanged；When input signal is current mode, although the impedance variations of the isoboles 2 and isoboles 3,
But current value is basically unchanged, and has Ohm's law that can obtain, U1/U2=R02/ (R02+R01).Voltage change is more apparent.It therefore can root
The type of input signal is judged according to the situation of change of the voltage of twi-read.
A kind of signal adaptive acquisition method provided in an embodiment of the present invention, the height generated by control level generation module
Low level changes the resistance value between the input signal interface, cooperates rear class signal condition and Acquisition Circuit to read corresponding
Voltage value, and then according to relevant voltage when resistance change between input signal interface of voltage mode signals and current mode signal
It is worth different Variation Features, to judge input signal types.Implementation through the invention can avoid out shell configuration, reduce and burn electricity
Road hidden danger improves user experience.
Optionally, in this embodiment, this method further include:
S250: control level generation module is generated according to the input signal types that the signal condition and Acquisition Circuit judge
Corresponding low and high level.
Specifically, after judging input signal types by step S240 voltage generating module can be controlled according to signal type
Corresponding level is exported, circuit impedance is made to be in optimum state.
When input signal is voltage-type, settable port 122 is low level, and then disconnects first, second partial pressure
Resistance；When input signal is voltage-type, settable port 121,122 is high level, and then by second divider resistance
112 accesses.
Mode the above is only the implementation of the present invention is not intended to limit the scope of the invention, all to utilize this
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field should all be included within the scope of the present invention.
Claims (9)
1. a kind of signal adaptive Acquisition Circuit characterized by comprising
Level generation module is controlled, for generating initial low and high level；
Signal input interface is used for input voltage or current signal；
Voltage and current adaptation module connects the control level generation module and signal input interface, for according to the control
The level that level generation module processed generates changes the resistance value size of itself, and then changes the voltage at the signal input interface both ends
Value；
Signal condition and Acquisition Circuit connect the signal input interface, for acquiring the electricity at the signal input interface both ends
Pressure value, and judge the type of input signal for voltage-type or current mode signal by comparing the voltage value acquired.
2. signal adaptive Acquisition Circuit according to claim 1, which is characterized in that the voltage and current adaptation module
Including the first divider resistance, the second divider resistance, the first relay, the second relay, first divider resistance, the second partial pressure
It is connect respectively with the signal input interface both ends after the series connection of the outlet side of resistance and the second relay, second relay
Control side both ends respectively with it is described control level generation module one end and power supply connect, the outlet side of first relay and
First divider resistance is in parallel, the control side both ends of first relay respectively with the other end for controlling level generation module
It is connected with power supply；
When the both ends of the control level generation module generate high level, first relay and the second relay it is defeated
Side conducting out, the signal condition and Acquisition Circuit read the first voltage value at the signal input interface both ends；When the control
One end that level generation module processed is connect with the control side of first relay generates high level, with second relay
When controlling the other end of side connection and generating low level, the outlet side of first relay is disconnected, second relay it is defeated
Side is connected out, and the signal condition and Acquisition Circuit read the second voltage value at the signal input interface both ends, and pass through ratio
The first voltage value and second voltage value judge the type of input signal for voltage-type or current mode signal.
3. signal adaptive Acquisition Circuit according to claim 2, which is characterized in that first relay and second after
Electric appliance is normally closed relay.
4. signal adaptive Acquisition Circuit according to claim 2, it is characterised in that: the voltage and current adaptation module
It further include two pole of the first freewheeling diode and the second afterflow in parallel with the first relay, the control side of the second relay respectively
Pipe.
5. signal adaptive Acquisition Circuit according to claim 1, which is characterized in that the control level generation module,
The type for the input signal for being also used to be judged according to the signal condition and Acquisition Circuit, generates corresponding low and high level.
6. a kind of signal adaptive acquisition method characterized by comprising
Control level generation module generates initial low and high level；
Signal input interface input voltage or current signal；
Voltage and current adaptation module changes the resistance value size of itself according to the level that the control level generation module generates, into
And change the voltage value at the signal input interface both ends；
Signal condition and Acquisition Circuit acquire the voltage value at the signal input interface both ends, and by comparing the voltage value acquired
Judge the type of input signal for voltage-type or current mode signal.
7. signal adaptive acquisition method according to claim 6, which is characterized in that the voltage and current adaptation module
Including the first divider resistance, the second divider resistance, the first relay, the second relay, first divider resistance, the second partial pressure
It is connect respectively with the signal input interface both ends after the series connection of the outlet side of resistance and the second relay, second relay
Control side both ends respectively with it is described control level generation module one end and power supply connect, the outlet side of first relay and
First divider resistance is in parallel, the control side both ends of first relay respectively with the other end for controlling level generation module
It is connected with power supply；
The signal condition and Acquisition Circuit acquire the voltage value at the signal input interface both ends, and by comparing the electricity acquired
Pressure value judges that the type of input signal for voltage-type or current mode signal, specifically includes:
When the both ends of the control level generation module generate high level, first relay and the second relay it is defeated
Side conducting out, the signal condition and Acquisition Circuit read the first voltage value at the signal input interface both ends；When the control
One end that level generation module processed is connect with the control side of first relay generates high level, with second relay
When controlling the other end of side connection and generating low level, the outlet side of first relay is disconnected, second relay it is defeated
Side is connected out, and the signal condition and Acquisition Circuit read the second voltage value at the signal input interface both ends, and pass through ratio
The first voltage value and second voltage value judge the type of input signal for voltage-type or current mode signal.
8. signal adaptive acquisition method according to claim 7, which is characterized in that the signal condition and Acquisition Circuit
By comparing the first voltage value and second voltage value judge the type of input signal for voltage-type or current mode signal, specifically
Include:
When the first voltage value is more than preset range relative to the variation of second voltage value, then judge the signal of input for electricity
Otherwise flow pattern signal is voltage mode signals.
9. according to signal adaptive acquisition method described in claim 6-8, which is characterized in that further include:
The control level generation module generates corresponding according to the input signal types that the signal condition and Acquisition Circuit judge
Low and high level.
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| CN112824842A (en) * | 2019-11-21 | 2021-05-21 | 浙江三花制冷集团有限公司 | Acquisition circuit and pressure sensor classification method |
| US20220043407A1 (en) * | 2020-08-06 | 2022-02-10 | Johnson Controls Tyco IP Holdings LLP | Field controller for a building management system |
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| CN109709373B (en) | 2021-08-24 |
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