CN109709373B - Signal self-adaptive acquisition circuit and acquisition method - Google Patents
Signal self-adaptive acquisition circuit and acquisition method Download PDFInfo
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- CN109709373B CN109709373B CN201811580104.9A CN201811580104A CN109709373B CN 109709373 B CN109709373 B CN 109709373B CN 201811580104 A CN201811580104 A CN 201811580104A CN 109709373 B CN109709373 B CN 109709373B
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Abstract
The invention discloses a signal self-adaptive acquisition circuit and an acquisition method, wherein the circuit comprises: the control level generating module is used for generating initial high and low levels; the signal input interface is used for inputting voltage or current signals; the voltage and current self-adaptive module is connected with the control level generation module and the signal input interface and is used for changing the resistance value of the voltage and current self-adaptive module according to the level generated by the control level generation module so as to change the voltage values at two ends of the signal input interface; and the signal conditioning and acquisition circuit is connected with the signal input interface and is used for acquiring voltage values at two ends of the signal input interface and judging whether the input signal is a voltage type or a current type signal by comparing the acquired voltage values. The invention can avoid shell opening configuration, reduce hidden danger of circuit burning and improve user experience.
Description
Technical Field
The invention relates to the field of embedded hardware, in particular to a signal self-adaptive acquisition circuit and an acquisition method
Background
At present, with the progress of technology, more and more sensors are adopted in modern factories, and the acquisition requirements of the sensors are larger and larger. The current common sensor acquisition module can only acquire one of a voltage signal or a current signal; or voltage or current mode signal acquisition can be supported, but the configuration of setting up the mode of jumper cap through opening the casing is very inconvenient. When the number of the sensors is large, particularly when the sensors are intensively collected, human errors that the current type signals are connected into the voltage collecting module or the voltage type signals are connected into the current collecting module easily occur, and particularly, when the current type signals are connected into the voltage collecting module, the current sensors are overloaded, so that sensor equipment is damaged.
Disclosure of Invention
In view of the above technical problems, the present invention provides a circuit and a method for signal adaptive acquisition.
In order to solve the technical problems, the invention adopts a technical scheme that: a signal adaptive acquisition circuit, the circuit comprising:
the control level generating module is used for generating initial high and low levels;
the signal input interface is used for inputting voltage or current signals;
the voltage and current self-adaptive module is connected with the control level generation module and the signal input interface and is used for changing the resistance value of the voltage and current self-adaptive module according to the level generated by the control level generation module so as to change the voltage values at two ends of the signal input interface;
and the signal conditioning and acquisition circuit is connected with the signal input interface and is used for acquiring voltage values at two ends of the signal input interface and judging whether the type of the input signal is a voltage type or a current type signal by comparing the acquired voltage values.
In order to solve the technical problem, the invention adopts another technical scheme that: a method of adaptive acquisition of a signal, the method comprising:
controlling a level generation module to generate initial high and low levels;
the signal input interface inputs a voltage or current signal;
the voltage and current self-adaptive module changes the resistance value of the voltage and current self-adaptive module according to the level generated by the control level generation module, and further changes the voltage values at two ends of the signal input interface;
the signal conditioning and collecting circuit collects voltage values at two ends of the signal input interface and judges whether the type of the input signal is a voltage type or a current type signal by comparing the collected voltage values.
The invention has the beneficial effects that: the resistance value between the input signal interfaces is changed by controlling the high and low levels generated by the level generation module, and the corresponding voltage value is read by matching with the post-stage signal conditioning and acquisition circuit, so that the input signal type is judged according to the change characteristics of the voltage type signal and the current type signal that the corresponding voltage value is different when the resistance value between the input signal interfaces is changed. The implementation of the invention can avoid the configuration of the shell opening, reduce the hidden trouble of burning the circuit and improve the user experience.
Drawings
Fig. 1 is a schematic structural diagram of a signal adaptive acquisition circuit according to an embodiment of the present invention;
fig. 2 is an equivalent circuit when both the first relay and the second relay of the signal adaptive acquisition circuit provided in the embodiment of the present invention are closed;
fig. 3 is an equivalent circuit of a signal adaptive acquisition circuit according to an embodiment of the present invention when a first relay is open and a second relay is closed;
fig. 4 is a schematic flow chart of a signal adaptive acquisition method according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be further described in more detail with reference to the following embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a signal adaptive acquisition circuit according to an embodiment of the present invention.
As shown in fig. 1, the signal adaptive acquisition circuit includes: a control level generation module 120, a signal input interface 130, and a voltage current adaptation module 110.
The control level generating module 120 is configured to generate an initial high-low level.
Specifically, the control level generation module may be disposed on a terminal CPU through an optocoupler, and when the CPU needs to determine the signal type, it triggers its designated pin to output a corresponding level.
A signal input interface 130 for inputting a voltage or current signal.
Specifically, the voltage or current signal may be an industry sensor standard voltage current signal, and the interface is a 5.08mm terminal interface on a PCB board.
The voltage and current adaptive module 110 is connected to the control level generating module 120 and the signal input interface 130, and configured to change a resistance value of the voltage and current adaptive module according to the level generated by the control level generating module 120, so as to change a voltage value at two ends of the signal input interface 130.
Specifically, the voltage-current adaptive module 110 may implement a change of its resistance value by accessing different voltage-dividing resistors.
And the signal conditioning and collecting circuit 140 is connected to the signal input interface, and is configured to collect voltage values at two ends of the signal input interface 130, and determine that the type of the input signal is a voltage type or a current type signal by comparing the collected voltage values.
Specifically, for a voltage type sensor, when the load changes, the voltage is not changed; for the current type sensor, the current is not changed when the load is changed, so that the voltage values are collected twice respectively for comparison, when the voltage change is large, the signal type is the current type, and when the voltage change is not large, the signal type is the voltage type.
According to the signal self-adaptive acquisition circuit provided by the embodiment of the invention, the resistance value between the input signal interfaces is changed by controlling the high and low levels generated by the level generation module, the corresponding voltage value is read by matching with the post-stage signal conditioning and acquisition circuit, and the type of the input signal is judged according to the change characteristics of different corresponding voltage values when the resistance values of the voltage type signal and the current type signal between the input signal interfaces are changed. The implementation of the invention can avoid the configuration of the shell opening, reduce the hidden trouble of burning the circuit and improve the user experience.
Optionally, in this embodiment, as shown in fig. 1, the voltage-current adaptation module 110 includes a first voltage-dividing resistor 111, a second voltage-dividing resistor 112, a first relay 113, and a second relay 114, where output sides of the first voltage-dividing resistor 111, the second voltage-dividing resistor 112, and the second relay 114 are connected in series and then connected to two ends of the signal input interface 130, two ends of a control side of the second relay 114 are connected to one end 121 of the control level generation module 120 and a power supply Vcc, respectively, an output side of the first relay 113 is connected in parallel to the first voltage-dividing resistor 111, and two ends of a control side of the first relay 113 are connected to the other end 122 of the control level generation module 120 and the power supply Vcc, respectively;
when both ends of the control level generating module 120 generate a high level, the output sides of the first relay 113 and the second relay 114 are turned on, and the signal conditioning and collecting circuit 140 reads a first voltage value U1 at both ends of the signal input interface; when the control level generating module 120 generates a high level at one end 121 connected to the control side of the first relay 113 and a low level at the other end 122 connected to the control side of the second relay 114, the output side of the first relay 113 is turned off, the output side of the second relay 114 is turned on, the signal conditioning and collecting circuit 140 reads a second voltage value U2 at both ends of the signal input interface 130, and determines whether the input signal is a voltage-type or current-type signal by comparing the first voltage value U1 with the second voltage value U2.
Specifically, the first relay 113 and the second relay 114 may be normally closed relays, the system power Vcc may be 5V or 12V, the high level of the control level generation module corresponds to the Vcc level, and the low level is 0V, where the first relay 113 and the second relay 114 both have the following characteristics: when current flows through the control side, the relay acts, and the output side of the relay is disconnected. Therefore, when the control level generation module 121 or 122 outputs a low level, the relay operates, and the output side thereof is turned off; when a high level is output, the relay is reset, and the output side is closed.
When the system needs to determine the Signal type, the CPU first controls the control level generation modules 121 and 122 to output a high level, at this time, the first relay 113 and the second relay 114 are reset, the output sides of the relays are both closed, and at this time, the system equivalent circuit is as shown in fig. 2, because the impedance of the post-stage Signal conditioning and acquisition circuit is large, it can be considered that the resistance value of the resistor between the Signal input interface 130Signal-P and Signal-N is equal to the resistance value R02 of the second divider resistor, and when the access Signal type is a current type, the voltage U _1 between Signal-P and Signal-N is I R02. When the input Signal type is a voltage type, the voltage U _1 between Signal-P and Signal-N is equal to U; next, the CPU controls the control level generation block 121 to output a low level, and 122 remains unchanged. In this case, as shown in fig. 3, the resistance between Signal-P and Signal-N is equal to the sum of R01 and R02, and when the Signal is of current type, the voltage U _2 between Signal-P and Signal-N is equal to I (R01+ R02), and when the Signal is of voltage type, the voltage U _2 between Signal-P and Signal-N is equal to U. For a voltage type sensor, when the load of the voltage type sensor is changed, the voltage is not changed; for the current type sensor, the current is not changed when the load is changed, so that the voltage values are collected twice respectively for comparison, when the voltage change is large, the signal type is the current type, and when the voltage change is not large, the signal type is the voltage type.
Optionally, in this embodiment, the voltage current adaptation module 110 further includes a first freewheeling diode 115 and a second freewheeling diode 116 connected in parallel with the control sides of the first relay 113 and the second relay 114, respectively.
Specifically, by providing the first freewheeling diode 115 and the second freewheeling diode 116, the current in the relay solenoid can be discharged when the relay is operated.
Optionally, in this embodiment, the control level generating module 120 is further configured to generate a corresponding high level and a corresponding low level according to the type of the input signal judged by the signal conditioning and acquiring circuit 110.
Specifically, when the type of the input signal is judged, the control level generation module outputs different level signals according to the type of the signal, so that the impedance of the circuit is optimized, and the acquisition circuit is in the optimal state. For example: when the signal is judged to be in a voltage type, the port 122 keeps low level, so that the second voltage-dividing resistor 112 is disconnected, and the input impedance of the circuit is increased; when the signal is judged to be in a current mode, the port 122 keeps a high level, the port 121 keeps a low level, and therefore the second voltage-dividing resistor 112 is connected, and a current value is obtained by collecting voltage on the resistor.
Referring to fig. 4, fig. 4 is a schematic flowchart of a method for adaptively acquiring a signal according to an embodiment of the present invention.
As shown in fig. 4, the method includes:
s210, controlling a level generation module to generate an initial high and low level;
specifically, as shown in fig. 1, the control level generating modules 121 and 122 both output a high level, and then the read voltage value is denoted as U1, the control level generating module 122 keeps the high level unchanged, and 121 outputs a low level, and then the read voltage value is denoted as U2.
The control level generation module 120 may be disposed on the terminal CPU through an optical coupler. When the signal type needs to be judged, the CPU generates required high and low levels through the optocoupler. Specifically, the generated high level coincides with the system power supply Vcc, and the low level is 0V.
S220, inputting a voltage or current signal by the signal input interface;
s230, the voltage and current self-adaption module changes the resistance value of the voltage and current self-adaption module according to the level generated by the control level generation module, and then changes the voltage values at the two ends of the signal input interface;
and S240, the signal conditioning and collecting circuit collects voltage values at two ends of the signal input interface, and judges whether the type of the input signal is a voltage type or a current type signal by comparing the collected voltage values.
Specifically, the voltage values U1 and U2 read twice are compared, if the difference between U1 and U2 is not large, the voltage mode is indicated when the signal is input, and if the difference is large, the input signal is indicated as the current mode.
As shown in fig. 2 and 3. Because the impedance of the post-stage Signal conditioning and acquisition circuit is relatively large, it can be considered that the resistance values of the resistors between the Signal input interfaces 130Signal-P and Signal-N are equal to R02 and R01+ R02, respectively.
Current mode sensors are equivalent to current sources over their range of load capacities, and voltage mode sensors are equivalent to voltage sources over their range of load capacities. Therefore, when the input signal is of a voltage type, although the impedances of the equivalent fig. 2 and the equivalent fig. 3 are changed, the voltage value is substantially unchanged; when the input signal is of a current type, although the impedances of the equivalent fig. 2 and the equivalent fig. 3 change, the current value is basically unchanged, and ohm's law is obtained, and U1/U2 is R02/(R02+ R01). The voltage variation is significant. Therefore, the type of the input signal can be judged according to the change situation of the voltage read twice.
According to the signal self-adaptive acquisition method provided by the embodiment of the invention, the resistance value between the input signal interfaces is changed by controlling the high and low levels generated by the level generation module, the corresponding voltage value is read by matching with the post-stage signal conditioning and acquisition circuit, and the input signal type is judged according to the change characteristics of different corresponding voltage values when the resistance values of the voltage type signal and the current type signal between the input signal interfaces are changed. The implementation of the invention can avoid the configuration of the shell opening, reduce the hidden trouble of burning the circuit and improve the user experience.
Optionally, in this embodiment, the method further includes:
s250: and the control level generation module generates corresponding high and low levels according to the input signal type judged by the signal conditioning and acquisition circuit.
Specifically, after the input signal type is determined in step S240, the voltage generation module may be controlled to output a corresponding level according to the signal type, so that the circuit impedance is in an optimal state.
When the input signal is a voltage type, the port 122 can be set to a low level, so as to disconnect the first voltage-dividing resistor and the second voltage-dividing resistor; when the input signal is a voltage type, the ports 121 and 122 can be set to be high level, so as to switch on the second voltage-dividing resistor 112.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or applied directly or indirectly to other related technical fields, shall be included in the scope of the present invention.
Claims (6)
1. A signal adaptive acquisition circuit, comprising:
the control level generating module is used for generating initial high and low levels;
the signal input interface is used for inputting voltage or current signals;
the voltage and current self-adaptive module is connected with the control level generation module and the signal input interface and is used for changing the resistance value of the voltage and current self-adaptive module according to the level generated by the control level generation module so as to change the voltage values at two ends of the signal input interface;
the voltage and current self-adaptive module comprises a first divider resistor, a second divider resistor, a first relay and a second relay, wherein output sides of the first divider resistor, the second divider resistor and the second relay are connected in series and then are respectively connected with two ends of the signal input interface, two ends of a control side of the second relay are respectively connected with one end of the control level generation module and a power supply, the output side of the first relay is connected with the first divider resistor in parallel, and two ends of the control side of the first relay are respectively connected with the other end of the control level generation module and the power supply;
the signal conditioning and acquisition circuit is connected with the signal input interface and is used for acquiring voltage values at two ends of the signal input interface and judging whether the type of the input signal is a voltage type or a current type signal by comparing the acquired voltage values;
when both ends of the control level generation module generate high levels, the output sides of the first relay and the second relay are conducted, and the signal conditioning and collecting circuit reads first voltage values at both ends of the signal input interface; when the control level generation module generates a high level at one end connected with the control side of the first relay and generates a low level at the other end connected with the control side of the second relay, the output side of the first relay is disconnected, the output side of the second relay is connected, the signal conditioning and acquisition circuit reads a second voltage value at two ends of the signal input interface and judges whether the type of the input signal is a voltage type or a current type signal by comparing the first voltage value with the second voltage value; the first relay and the second relay are normally closed relays.
2. The signal adaptive acquisition circuit of claim 1, wherein: the voltage and current adaptive module further comprises a first fly-wheel diode and a second fly-wheel diode which are connected with the control sides of the first relay and the second relay in parallel respectively.
3. The adaptive signal acquisition circuit of claim 1, wherein the control level generation module is further configured to generate a corresponding high level and a corresponding low level according to the type of the input signal determined by the signal conditioning and acquisition circuit.
4. A method for adaptive signal acquisition, comprising:
controlling a level generation module to generate initial high and low levels;
the signal input interface inputs a voltage or current signal;
the voltage and current self-adaptive module changes the resistance value of the voltage and current self-adaptive module according to the level generated by the control level generation module, and further changes the voltage values at two ends of the signal input interface;
the voltage and current self-adaptive module comprises a first divider resistor, a second divider resistor, a first relay and a second relay, wherein output sides of the first divider resistor, the second divider resistor and the second relay are connected in series and then are respectively connected with two ends of the signal input interface, two ends of a control side of the second relay are respectively connected with one end of the control level generation module and a power supply, the output side of the first relay is connected with the first divider resistor in parallel, and two ends of the control side of the first relay are respectively connected with the other end of the control level generation module and the power supply;
the signal conditioning and collecting circuit collects voltage values at two ends of the signal input interface and judges whether the type of the input signal is a voltage type or a current type signal by comparing the collected voltage values;
the signal conditioning and acquisition circuit collects the voltage values at two ends of the signal input interface, and judges whether the type of the input signal is a voltage type or a current type signal by comparing the collected voltage values, and the signal conditioning and acquisition circuit specifically comprises:
when both ends of the control level generation module generate high levels, the output sides of the first relay and the second relay are conducted, and the signal conditioning and collecting circuit reads first voltage values at both ends of the signal input interface; when the control level generating module generates a high level at one end connected with the control side of the first relay and generates a low level at the other end connected with the control side of the second relay, the output side of the first relay is disconnected, the output side of the second relay is connected, the signal conditioning and collecting circuit reads a second voltage value at two ends of the signal input interface and judges whether the type of the input signal is a voltage type or a current type signal by comparing the first voltage value with the second voltage value.
5. The signal adaptive collection method according to claim 4, wherein the signal conditioning and collection circuit determines whether the input signal is a voltage-type or current-type signal by comparing the first voltage value with the second voltage value, and specifically comprises:
and when the change of the first voltage value relative to the second voltage value exceeds a preset range, judging that the input signal is a current type signal, otherwise, judging that the input signal is a voltage type signal.
6. The signal adaptive acquisition method according to any one of claims 4 to 5, further comprising:
and the control level generation module generates corresponding high and low levels according to the input signal type judged by the signal conditioning and acquisition circuit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11774929B2 (en) * | 2020-08-06 | 2023-10-03 | Johnson Controls Tyco IP Holdings LLP | Field controller for a building management system |
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| CN112824842B (en) * | 2019-11-21 | 2023-06-16 | 浙江三花商用制冷有限公司 | Acquisition circuit and pressure sensor classification method |
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