CN216747861U - Voltage and current signal acquisition device - Google Patents
Voltage and current signal acquisition device Download PDFInfo
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- CN216747861U CN216747861U CN202122972954.7U CN202122972954U CN216747861U CN 216747861 U CN216747861 U CN 216747861U CN 202122972954 U CN202122972954 U CN 202122972954U CN 216747861 U CN216747861 U CN 216747861U
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Abstract
The utility model discloses a voltage and current signal acquisition device, which comprises a switch selection unit, a voltage signal conditioning unit, a current acquisition unit and a control unit; the input end of the switch selection unit is connected with the signal wiring terminal, the output end of the switch selection unit is connected with the current acquisition unit, and the enable end of the switch selection unit is connected with the control unit; the output end of the current acquisition unit is connected with the control unit; the input end of the voltage signal conditioning unit is connected with the signal wiring terminal, and the output end of the voltage signal conditioning unit is connected with the control unit; the utility model discloses under the jumper state condition that does not need manual change, can gather voltage signal also can gather current signal. And when the current signal is collected, the voltage signal can be cut off in time when the voltage signal exceeding the amplitude is accessed, so that the protection of the control unit is realized.
Description
Technical Field
The utility model belongs to the industrial data gathers the field, especially relates to a voltage current signal collection system.
Background
The frequency converter is often externally connected with various sensors, the sensors output current signals or voltage signals, the current signals are usually 4-20mA, and the voltage signals are usually 0-10V. When the sensor is a current signal, a resistor with hundreds of ohms is usually connected in parallel on a channel to convert the current into voltage, but when the input signal is a voltage signal, the resistance value of the sampling resistor is low, the sampling resistor consumes large power, the resistor heats seriously, and the sensor is possibly damaged.
The traditional collection channel is characterized in that a jumper is placed at a wiring terminal of the channel, one end of the jumper is connected with a current sampling resistor, when an input signal is a voltage signal, the sampling resistor is manually disconnected with the wiring terminal by the jumper, and if the input signal is a current signal, the sampling resistor is manually connected with the wiring terminal by the jumper. The circuit board is generally arranged in the shell, and the shell is required to be opened when the state of the jumper is manually changed, so that the operation is troublesome, and the device can be damaged if the operation is wrong.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a voltage and current signal acquisition device is provided to solve the problem of manual change jumper ware.
In order to achieve the purpose, the utility model adopts the technical proposal that:
on one hand, the utility model provides a voltage and current signal acquisition device, which comprises a switch selection unit, a voltage signal conditioning unit, a current acquisition unit and a control unit; the input end of the switch selection unit is connected with the signal wiring terminal, the output end of the switch selection unit is connected with the current acquisition unit, the enable end of the switch selection unit is connected with the control unit, and the switch selection unit controls whether the signal of the signal wiring terminal enters the current acquisition unit or not according to the instruction of the control unit; the current acquisition unit receives a current signal input by the switch selection unit, converts the current signal into a voltage signal and inputs the voltage signal into the control unit; the input end of the voltage signal conditioning unit is connected with the signal wiring terminal, and the input voltage signal is subjected to voltage amplitude conversion and then input into the control unit; and the control unit is used for controlling whether the switch of the switch selection unit is closed or not and converting the input voltage amplitude and the input voltage signal into corresponding digital quantity. Preferably, the switch selection unit is composed of an analog switch chip, an input end of the analog switch is connected with the signal wiring terminal, an output end of the analog switch is connected with the current acquisition unit, and an enabling end of the analog switch is connected with the control unit.
Preferably, the switch selection unit is composed of an analog switch chip.
Preferably, the voltage signal conditioning unit is composed of a voltage follower and a voltage amplitude variation circuit.
Preferably, the current signal acquisition unit is composed of a sampling resistor.
Preferably, the current signal acquisition unit further comprises a protection unit, the protection unit comprises a voltage stabilizing diode, and when the voltage value of the sampling resistor exceeds the voltage of the voltage stabilizing diode, the voltage value is clamped to a safe value, so that the protection control unit is protected.
Preferably, the system further comprises a man-machine conversation module, and the man-machine conversation module is connected with the control unit.
Preferably, the control unit is a single chip microcomputer or a DSP.
Compared with the prior art, beneficial effect:
the control unit controls the switch in the switch selection unit to be separated, so that the voltage signal can not enter the current sampling and protection unit and only can enter the voltage signal conditioning unit; when the signal on the signal wiring terminal is a current signal, the control unit closes the switch in the switch selection unit. The voltage and current signals can be collected by one channel without manually changing the state of the jumper. And voltage signals exceeding the amplitude are accessed when the current signals are collected, the control unit can be protected, and the damage to devices is effectively avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a block diagram of a voltage and current signal collecting device according to an embodiment of the present invention;
fig. 2 is a block diagram of a voltage/current signal collecting device according to another embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a voltage signal conditioning unit according to an embodiment of the present invention.
Detailed Description
In order to make the purpose, technical solution and advantages of the present invention clearer, the following will combine the drawings in the embodiments of the present invention to perform more detailed description on the technical solution in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a voltage and current signal acquisition device includes a switch selection unit 1, a voltage signal conditioning unit 3, a current acquisition unit 2, and a control unit 4; the input end of the switch selection unit 1 is connected with the signal wiring terminal, the output end of the switch selection unit is connected with the current acquisition unit 2, the enabling end of the switch selection unit is connected with the control unit 4, and the switch selection unit 1 controls whether the signal of the signal wiring terminal enters the current acquisition unit 2 according to the instruction of the control unit 4; the current acquisition unit 2 receives a current signal input by the switch selection unit 1, converts the current signal into a voltage signal and inputs the voltage signal into the control unit 4; the input end of the voltage signal conditioning unit 3 is connected with a signal wiring terminal, and the input voltage signal is subjected to voltage amplitude conversion and then input into the control unit 4; and the control unit 4 is used for controlling whether the switch of the switch selection unit 1 is closed or not and converting the input voltage amplitude and the input voltage signal into corresponding digital quantities.
Further, the switch selection unit 1 is composed of an analog switch chip, the input end of the analog switch is connected with the signal wiring terminal, the output end of the analog switch is connected with the current acquisition unit, and the enabling end of the analog switch is connected with the control unit. The control unit can control whether the switch inside the switch selection unit is closed or not through the con enable terminal in fig. 1.
Further, the current signal acquisition unit 2 is composed of a sampling resistor, a current signal of the signal wiring terminal enters the current signal acquisition unit through the switch selection circuit, and a voltage signal is converted and then reaches the control unit.
As shown in fig. 2, in another embodiment of the present invention, the current signal collecting unit further includes a protection unit, the current signal collecting unit 2 and the protection unit form a current signal collecting and protecting unit 21, the protection unit includes a zener diode, and when the voltage value of the sampling resistor exceeds the voltage of the zener diode, the voltage value will be clamped to the safety value, thereby playing a role of protecting the control unit.
In a preferred embodiment, the voltage signal conditioning unit 3 is composed of a voltage follower and a voltage amplitude varying circuit.
Specifically, as shown in fig. 3, U1 and R1 form a voltage follower, R1 selects a resistor with a large resistance value, and the voltage follower plays a role in impedance change, thereby increasing the input impedance of the voltage signal conditioning unit 3 and reducing the influence on the signal from the signal connection terminal; u2, R2, R3, R4 and R5 form a voltage amplitude change circuit and play a role in scaling down voltage. The voltage signal conditioning unit 3 converts the voltage signal from the signal wiring terminal into a voltage amplitude which can be accepted by the control unit 4 on the premise of not influencing the voltage signal. For example, the amplitude of the voltage signal output by the sensor is generally 0-10V, the amplitude of the voltage signal accepted by the control unit 4 is 0-3.3V, and the voltage signal conditioning unit 3 converts the 0-10V output by the external sensor into 0-3.3V and sends the 0-3V to the control unit 4.
Further, the control unit 4 is a single chip microcomputer or a DSP.
Specifically, the control unit 4 is a device with a programming function, can communicate with modules with a man-machine conversation function, such as a touch screen, a computer monitoring interface and the like, can convert an analog quantity into a digital quantity, is not less than 2 sampling channels, has 2 digital-to-analog conversion interfaces, and has a digital pin for output.
In another embodiment of the present invention, the voltage/current signal collecting device further comprises a man-machine dialogue module, and the man-machine dialogue module is connected to the control unit 4. An operator can conveniently control whether the switch inside the switch selection unit is closed or not in the man-machine conversation module.
Further, a common control chip such as a single chip microcomputer and a DSP can be used as the control unit 4.
The working process of the voltage and current signal acquisition device is as follows: when the signal on the signal wiring terminal is a voltage signal, the control unit 4 separates the switch in the switch selection unit 1, so that the voltage signal can not enter the current sampling and protection unit 21 and can only enter the voltage signal conditioning unit 3; when the signal on the signal wiring terminal is a current signal, the control unit 4 closes the switch in the switch selection unit 1, and because the resistance value of the current sampling resistor is small, the internal resistance value of the voltage signal conditioning unit 3 is large, most of the current flows through the sampling resistor, that is to say, the influence of the voltage signal conditioning unit 3 on the current signal can be ignored.
In the actual measurement process, when a voltage signal is on a signal connecting terminal, but an operator thinks that the voltage signal is a current signal by mistake, the switch in the switch selection unit 1 is closed, when the voltage exceeds the voltage of the voltage stabilizing diode in the current acquisition and protection unit 21, the voltage is clamped to the voltage of the voltage stabilizing diode, so that the control unit is protected from being damaged, meanwhile, the control unit 4 detects the action of the voltage stabilizing diode according to the voltage conversion value of the current acquisition unit 2, the switch in the switch selection unit 1 is rapidly separated, and the voltage stabilizing diode is prevented from being burnt out due to overheating.
When the signal on the signal connecting terminal is a current signal, but an operator mistakenly thinks that the signal is a voltage signal, the switch in the current collecting and protecting unit 21 is separated, the current completely flows through the voltage conditioning voltage unit 3, a higher voltage can be generated at the signal connecting terminal due to the higher internal resistance of the voltage signal conditioning unit, and at the moment, the output voltage value of the voltage signal conditioning unit 3 does not exceed the safe voltage of the control unit 4 when the maximum voltage is input by adjusting the attenuation ratio of the voltage signal conditioning unit 3, so that the control unit 4 is protected from being damaged.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with reference to the above preferred embodiment, but not to limit the present invention, any person skilled in the art can make modifications or changes to equivalent embodiments by utilizing the above technical contents without departing from the scope of the present invention, and any simple modification, equivalent change and modification made to the above embodiments by the technical matters of the present invention are within the scope of the present invention.
Claims (7)
1. The utility model provides a voltage current signal acquisition device which characterized in that: the device comprises a switch selection unit, a voltage signal conditioning unit, a current acquisition unit and a control unit; the input end of the switch selection unit is connected with the signal wiring terminal, the output end of the switch selection unit is connected with the current acquisition unit, the enable end of the switch selection unit is connected with the control unit, and the switch selection unit controls whether the signal of the signal wiring terminal enters the current acquisition unit or not according to the instruction of the control unit; the current acquisition unit receives a current signal input by the switch selection unit, converts the current signal into a voltage signal and inputs the voltage signal into the control unit; the input end of the voltage signal conditioning unit is connected with the signal wiring terminal, and the input voltage signal is subjected to voltage amplitude conversion and then input into the control unit; and the control unit is used for controlling whether the switch of the switch selection unit is closed or not and converting the input voltage amplitude and the input voltage signal into corresponding digital quantity.
2. The voltage-current signal acquisition device according to claim 1, wherein: the switch selection unit is composed of an analog switch chip.
3. The voltage-current signal acquisition device according to claim 1, wherein: the voltage signal conditioning unit is composed of a voltage follower and a voltage amplitude value changing circuit.
4. The voltage-current signal acquisition device according to claim 1, wherein: the current signal acquisition unit consists of a sampling resistor.
5. The voltage-current signal acquisition device according to claim 1, wherein: the current signal acquisition unit also comprises a protection unit, the protection unit comprises a voltage stabilizing diode, and when the voltage value of the sampling resistor exceeds the voltage of the voltage stabilizing diode, the voltage value is clamped to a safe value, so that the current signal acquisition unit plays a role in protecting the control unit.
6. The voltage-current signal acquisition device according to claim 1, wherein: the system also comprises a man-machine conversation module, and the man-machine conversation module is connected with the control unit.
7. The voltage-current signal acquisition device according to claim 6, wherein: the control unit is a single chip microcomputer or a DSP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122972954.7U CN216747861U (en) | 2021-11-30 | 2021-11-30 | Voltage and current signal acquisition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122972954.7U CN216747861U (en) | 2021-11-30 | 2021-11-30 | Voltage and current signal acquisition device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216747861U true CN216747861U (en) | 2022-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122972954.7U Active CN216747861U (en) | 2021-11-30 | 2021-11-30 | Voltage and current signal acquisition device |
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| CN (1) | CN216747861U (en) |
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2021
- 2021-11-30 CN CN202122972954.7U patent/CN216747861U/en active Active
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Address after: No.7, Zhujiang Road, the second industrial park, Xuzhou high tech Zone, Xuzhou City, Jiangsu Province, 221116 Patentee after: Jiangsu Guochuan Electric Co.,Ltd. Address before: No.7, Zhujiang Road, the second industrial park, Xuzhou high tech Zone, Xuzhou City, Jiangsu Province, 221116 Patentee before: CHINA MINING DRIVES & AUTOMATION Co.,Ltd. |