CN111026211A - Conversion circuit for converting current into voltage - Google Patents
Conversion circuit for converting current into voltage Download PDFInfo
- Publication number
- CN111026211A CN111026211A CN201811172898.5A CN201811172898A CN111026211A CN 111026211 A CN111026211 A CN 111026211A CN 201811172898 A CN201811172898 A CN 201811172898A CN 111026211 A CN111026211 A CN 111026211A
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- resistor
- capacitor
- voltage
- fuse
- conversion circuit
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
- H03K5/24—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
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- Engineering & Computer Science (AREA)
- Nonlinear Science (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Amplifiers (AREA)
Abstract
The present invention relates to a conversion circuit for converting a current into a voltage. The conversion circuit comprises a fuse (F1), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a voltage stabilizing diode (D1) and an amplifier (A1). The current-voltage conversion circuit adopts the self-recovery fuse, and when the overcurrent and overheat faults of the circuit are eliminated, the self-recovery fuse can automatically recover to a low-resistance state without replacement, so that the circuit is convenient to use and can protect the safety of a power supply system. And the current signal is filtered through the first capacitor to remove interference and improve the conversion accuracy and stability.
Description
Technical Field
The present invention relates to the field of conversion circuits, and in particular, to a conversion circuit for converting a current into a voltage.
Background
With the development of modern industrial and scientific technology, test tasks and measurement and control objects become more and more complex, and the requirements on test speed and test precision are higher and higher, so that the technology of an automatic measurement and control system is promoted to continuously develop to a new field.
In a computer automatic measurement and control system, an electric combination unit with a certain function is often selected as a part of the system, wherein an output signal of the electric combination unit is generally a current signal, while a signal output of a general single chip microcomputer application system is only a voltage signal, and only the voltage signal can be processed, so that conversion between current and voltage is required.
However, the current circuit for converting current into voltage has poor safety and poor conversion accuracy.
Disclosure of Invention
Therefore, to overcome the technical defects and shortcomings of the prior art, the present invention provides a conversion circuit suitable for converting current into voltage.
Specifically, an embodiment of the present invention provides a conversion circuit for converting a current into a voltage, including a fuse, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a third capacitor, a zener diode, and an amplifier,
the fuse and the third resistor are sequentially connected in series to a current input end and a positive input end of the amplifier, a first end of the first capacitor is connected to a node formed by connecting the current input end and the fuse, a second end of the first capacitor is connected to a ground end, a first end formed by connecting the first resistor and the second resistor in series is connected to a node formed by connecting the fuse and the third resistor, a second end formed by connecting the first resistor and the second resistor in series is connected to the ground end, a first end of the second capacitor is connected to a node formed by connecting the fuse and the third resistor, and a second end of the second capacitor is connected to the ground end;
the negative input end of the amplifier is connected to the sixth resistor, a first end formed by connecting the sixth resistor, the zener diode and the third capacitor in parallel is connected to a first end of the fifth resistor, a second end formed by connecting the sixth resistor, the zener diode and the third capacitor in parallel is connected to a ground end, a second end of the fifth resistor is connected to a voltage input end, a first end of the seventh resistor is connected to a second end formed by connecting the sixth resistor, the zener diode and the third capacitor in parallel, a second end of the seventh resistor is connected to a node formed by connecting the fourth resistor and the voltage output end, and the fourth resistor is connected between the output end of the amplifier and the voltage output end in series.
In one embodiment of the present invention, the second resistor and the sixth resistor are both sliding varistors.
In one embodiment of the invention, the model of the zener diode is MTZ 2.0.
In one embodiment of the present invention, the amplifier is model LM 224.
In one embodiment of the invention, the fuse is a self-healing fuse.
In one embodiment of the present invention, the type of the self-healing fuse is WH 130.
The embodiment of the invention has the following advantages:
1. the current-voltage conversion circuit adopts the self-recovery fuse, and when the overcurrent and overheat faults of the circuit are eliminated, the self-recovery fuse can automatically recover to a low-resistance state without replacement, so that the circuit is convenient to use and can protect the safety of a power supply system. And the current signal is filtered through the first capacitor to remove interference and improve the conversion accuracy and stability.
2. The invention improves the accuracy of converting the current signal into the voltage signal by connecting the fixed resistor and the trimming resistor in series.
3. The reference voltage of the current-voltage conversion circuit is provided with the sliding rheostat, the reference voltage can be adjusted, the reference voltage is changed by changing the voltage distribution proportion of the sixth resistor and the seventh resistor, and therefore the applicability of the conversion circuit is wider.
Other aspects and features of the present invention will become apparent from the following detailed description, which proceeds with reference to the accompanying drawings. It is to be understood, however, that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the invention, for which reference should be made to the appended claims. It should be further understood that the drawings are not necessarily drawn to scale and that, unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described herein.
Drawings
The following detailed description of embodiments of the invention will be made with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a conversion circuit for converting a current into a voltage according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.
Referring to fig. 1, fig. 1 is a schematic diagram of a conversion circuit for converting a current into a voltage according to an embodiment of the present invention. An embodiment of the present invention provides a conversion circuit for converting current into voltage, the conversion circuit including a fuse F1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first capacitor C1, a second capacitor C2, a third capacitor C3, a zener diode D1, and an amplifier a1, wherein,
the fuse F1 and the third resistor R3 are connected in series to the current input terminal Iin and the positive input terminal of the amplifier a1, a first terminal of the first capacitor C1 is connected to a node formed by the connection of the current input terminal Iin and the fuse F1, the second end of the first capacitor C1 is connected to the ground GND, the first end of the first resistor R1 and the second resistor R2 connected in series is connected to the node formed by the fuse F1 and the third resistor R3, the second end of the first resistor R1 and the second resistor R2 connected in series is connected to the ground GND, a first end of the second capacitor C2 is connected to a node formed by the connection of the fuse F1 and the third resistor R3, a second end of the second capacitor C2 is connected to a ground GND, and the first resistor R1 and the second resistor R2 are connected in series and then connected in parallel with the second capacitor C2;
the negative input end of the amplifier A1 is connected to the sixth resistor R6, the first end of the sixth resistor R6, the zener diode D1 and the third capacitor C3 which are connected in parallel is connected to the first end of the fifth resistor R5, a second end formed by connecting the sixth resistor R6, the zener diode D1 and the third capacitor C3 in parallel is connected to a ground terminal GND, the cathode of the zener diode D1 is connected to the fifth resistor R5, the anode of the zener diode D1 is connected to the ground GND, the second end of the fifth resistor R5 is connected to the voltage input terminal Vin, the first end of the seventh resistor R7 is connected to the second end formed by the parallel connection of the sixth resistor R6, the zener diode D1 and the third capacitor C3, the second end of the seventh resistor R7 is connected to the node formed by the connection of the fourth resistor R4 and the voltage output terminal Vout, the fourth resistor R4 is connected in series between the output terminal of the amplifier A1 and the voltage output terminal Vout.
The current signal is filtered through the first capacitor to remove interference, so that the stability of current signal transmission is ensured, and the conversion accuracy and stability are improved.
Specifically, the fuse F1 is a self-healing fuse, and the model number of the self-healing fuse is WH 130.
The self-recovery fuse is adopted, so that the current-voltage conversion circuit can be protected, and when the overcurrent and overheat faults of the current-voltage conversion circuit are eliminated, the self-recovery fuse can automatically recover to a low-resistance state, does not need to be replaced, is convenient to use, and can protect the safety of a power supply system.
Specifically, the first resistor R1 is a fixed resistance resistor, the second resistor R2 is a sliding rheostat, and the second resistor R2 is a trimming resistor, and trimming is performed by using the second resistor R2.
The accuracy of the conversion of the current signal to the voltage signal is improved by the series connection of the first resistor R1 and the second resistor R2.
The reference voltage of the conversion circuit of the embodiment is provided with the sixth resistor, the sixth resistor is a sliding rheostat, the reference voltage can be adjusted by adjusting the size of the sixth resistor, and the reference voltage is changed by changing the voltage distribution proportion of the sixth resistor and the seventh resistor, so that the conversion circuit is wider in applicability. Through setting up zener diode can be used for stabilizing voltage, and carry out the filtering through third electric capacity, further guarantee the stability of voltage.
Preferably, the zener diode D1 has a model number MTZ 2.0.
Preferably, amplifier a1 is model LM 224.
For example, when the current signal to be converted is 4-20mA, the first resistor R1 may be set to 200 Ω, the second resistor R2 may be set to 0-10 Ω, the third resistor R3 may be set to 100 Ω, the voltage input from the voltage input terminal Vin may be 5V, the fourth resistor R4 may be 200 Ω, the fifth resistor R5 may be 1k Ω, the sixth resistor R6 may be 0-2k Ω, and the seventh resistor R7 may be 1k Ω, so that the converted voltage signal may be 0-5V.
The working principle of the current-voltage circuit is as follows: after the current signal is filtered, the current signal is converted into a voltage signal and then output through the output terminal of the amplifier a 1. During the amplification of the voltage signal by amplifier a1, a reference voltage needs to be provided at the negative input of amplifier a 1. The reference voltage can be adjusted by adjusting the size of the sixth resistor, and the reference voltage is changed by changing the voltage distribution proportion of the sixth resistor and the seventh resistor, so that the conversion circuit is wider in applicability. Can be used for stabilizing voltage through setting up zener diode, and filter through third electric capacity, further guarantee the stability of voltage for the converting circuit of this embodiment is difficult for receiving external disturbance, ensures the voltage accuracy after the conversion.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A conversion circuit for converting a current to a voltage, comprising: a fuse (F1), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a zener diode (D1) and an amplifier (A1), wherein,
the fuse (F1) and the third resistor (R3) are connected in series with the current input end (Iin) and the positive input end of the amplifier (A1) in turn, a first terminal of the first capacitor (C1) is connected to a node where the current input terminal (Iin) and the fuse (F1) are connected, the second end of the first capacitor (C1) is connected to the Ground (GND), the first end formed by the first resistor (R1) and the second resistor (R2) connected in series is connected to the node formed by the fuse (F1) and the third resistor (R3), the second end of the first resistor (R1) and the second resistor (R2) which are connected in series is connected to the Ground (GND), a first end of the second capacitor (C2) is connected to a node formed by connecting the fuse (F1) and the third resistor (R3), and a second end of the second capacitor (C2) is connected to a ground terminal (GND);
the negative input end of the amplifier (A1) is connected with the sixth resistor (R6), the first end formed by the parallel connection of the sixth resistor (R6), the voltage-stabilizing diode (D1) and the third capacitor (C3) is connected with the first end of the fifth resistor (R5), a second end formed by the parallel connection of the sixth resistor (R6), the zener diode (D1) and the third capacitor (C3) is connected to a ground terminal (GND), a second terminal of the fifth resistor (R5) is connected to the voltage input terminal (Vin), the first end of the seventh resistor (R7) is connected with the second end formed by the parallel connection of the sixth resistor (R6), the voltage stabilizing diode (D1) and the third capacitor (C3), a second terminal of the seventh resistor (R7) is connected to a node where the fourth resistor (R4) and a voltage output terminal (Vout) are connected, the fourth resistor (R4) is connected in series between the output terminal of the amplifier (A1) and the voltage output terminal (Vout).
2. The conversion circuit according to claim 1, characterized in that the second resistor (R2) and the sixth resistor (R6) are both slide varistors.
3. The conversion circuit of claim 1, said zener diode (D1) being of the type MTZ 2.0.
4. The conversion circuit of claim 1, said amplifier (a1) being of the type LM 224.
5. The conversion circuit of claim 1, said fuse (F1) being a self-healing fuse.
6. The conversion circuit of claim 5, the self-healing fuse being of the type WH 130.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811172898.5A CN111026211A (en) | 2018-10-09 | 2018-10-09 | Conversion circuit for converting current into voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811172898.5A CN111026211A (en) | 2018-10-09 | 2018-10-09 | Conversion circuit for converting current into voltage |
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| Publication Number | Publication Date |
|---|---|
| CN111026211A true CN111026211A (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811172898.5A Withdrawn CN111026211A (en) | 2018-10-09 | 2018-10-09 | Conversion circuit for converting current into voltage |
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| CN (1) | CN111026211A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510280A (en) * | 2011-12-31 | 2012-06-20 | 河南辉煌科技股份有限公司 | Signal transmission circuit |
| CN103558445A (en) * | 2013-11-13 | 2014-02-05 | 丹纳赫（上海）工业仪器技术研发有限公司 | Current detection circuit and measuring device |
| CN204028258U (en) * | 2014-08-28 | 2014-12-17 | 北京铨富光电科技有限公司 | A kind of LED light source load detecting circuit of electric ballast |
| CN104597957A (en) * | 2015-02-04 | 2015-05-06 | 成都市宏山科技有限公司 | Current conversion circuit |
| CN205883038U (en) * | 2016-04-20 | 2017-01-11 | 北京泛华新兴体育产业股份有限公司 | Current foldback circuit and have display screen of this circuit |
| CN206601438U (en) * | 2017-03-21 | 2017-10-31 | 广州珠江电信设备制造有限公司 | Duplex high precision Current Voltage Acquisition Circuit |
| CN206956158U (en) * | 2016-10-09 | 2018-02-02 | 上海道盾科技股份有限公司 | Monitor the device that stray electrical current disturbs in cathodic protection test pile |
-
2018
- 2018-10-09 CN CN201811172898.5A patent/CN111026211A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510280A (en) * | 2011-12-31 | 2012-06-20 | 河南辉煌科技股份有限公司 | Signal transmission circuit |
| CN103558445A (en) * | 2013-11-13 | 2014-02-05 | 丹纳赫（上海）工业仪器技术研发有限公司 | Current detection circuit and measuring device |
| CN204028258U (en) * | 2014-08-28 | 2014-12-17 | 北京铨富光电科技有限公司 | A kind of LED light source load detecting circuit of electric ballast |
| CN104597957A (en) * | 2015-02-04 | 2015-05-06 | 成都市宏山科技有限公司 | Current conversion circuit |
| CN205883038U (en) * | 2016-04-20 | 2017-01-11 | 北京泛华新兴体育产业股份有限公司 | Current foldback circuit and have display screen of this circuit |
| CN206956158U (en) * | 2016-10-09 | 2018-02-02 | 上海道盾科技股份有限公司 | Monitor the device that stray electrical current disturbs in cathodic protection test pile |
| CN206601438U (en) * | 2017-03-21 | 2017-10-31 | 广州珠江电信设备制造有限公司 | Duplex high precision Current Voltage Acquisition Circuit |
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Application publication date: 20200417 |