CN111026210A - Current-voltage conversion circuit with voltage stabilizing function - Google Patents
Current-voltage conversion circuit with voltage stabilizing function Download PDFInfo
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- CN111026210A CN111026210A CN201811172749.9A CN201811172749A CN111026210A CN 111026210 A CN111026210 A CN 111026210A CN 201811172749 A CN201811172749 A CN 201811172749A CN 111026210 A CN111026210 A CN 111026210A
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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
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Abstract
The invention relates to a current-voltage conversion circuit with a voltage stabilizing function. The current-voltage 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), an eighth resistor (R8), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a first voltage-stabilizing diode (D1), a second voltage-stabilizing diode (D2), a third voltage-stabilizing diode (D3), a transistor (M1) and an amplifier (A1). The voltage stabilizing module is arranged in the current-voltage conversion circuit designed by the invention, so that the stability of the current-voltage conversion circuit is improved, and the performance of an automatic measurement and control system is improved.
Description
Technical Field
The present invention relates to a switching circuit, and more particularly, to a current-voltage switching circuit having a voltage stabilizing function.
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 voltage conversion circuit has poor stability, thereby affecting the performance of the automatic measurement and control system.
Disclosure of Invention
Therefore, in order to solve the technical defects and shortcomings of the prior art, the invention provides a current-voltage conversion circuit with a voltage stabilizing function.
Specifically, an embodiment of the present invention provides a current-to-voltage conversion circuit with a voltage stabilizing function, including: a fuse, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, a second capacitor, a third capacitor, a first zener diode, a second zener diode, a third zener diode, a transistor, 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 fifth resistor and the sixth resistor are sequentially connected in series between a voltage input end and a negative input end of the amplifier, a first end formed by connecting the first voltage stabilizing diode and the second voltage stabilizing diode in parallel is connected to a node formed by connecting the fifth resistor and the sixth resistor, a second end formed by connecting the first voltage stabilizing diode and the second voltage stabilizing diode in parallel is connected to a ground end, a negative electrode of the first voltage stabilizing diode is connected to a node formed by connecting the fifth resistor and the sixth resistor, a positive electrode of the first voltage stabilizing diode is connected to the ground end, a positive electrode of the second voltage stabilizing diode is connected to a node formed by connecting the fifth resistor and the sixth resistor, a negative electrode of the second voltage stabilizing diode is connected to the ground end, and the seventh resistor is connected in series between the sixth resistor and a drain electrode of the transistor, the fourth resistor is connected between the output end of the amplifier and the drain electrode of the transistor in series;
the source electrode of the transistor is connected to the voltage output end, the grid electrode of the transistor is connected to the negative electrode of the third voltage stabilizing diode, the positive electrode of the third voltage stabilizing diode is connected to the grounding end, the first end formed by connecting the eighth resistor and the third capacitor in parallel is connected to the node formed by connecting the source electrode of the transistor and the voltage output end, and the second end formed by connecting the eighth resistor and the third capacitor in parallel is connected to the grounding end.
In one embodiment of the invention, the second resistor is a sliding varistor.
In one embodiment of the present invention, the first zener diode, the second zener diode, and the third zener diode are all MTZ2.0 in size.
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 voltage stabilizing module is arranged in the current-voltage conversion circuit designed by the invention, so that the stability of the current-voltage conversion circuit is improved, and the performance of an automatic measurement and control system is improved.
2. The reference voltage of the current-voltage conversion circuit is provided with the two voltage stabilizing diodes, so that the stability of the reference voltage provided for the amplifier is improved, and the conversion stability of the current-voltage conversion circuit is improved.
3. 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.
4. According to the invention, the current signal is filtered through the first capacitor to remove interference and improve the conversion accuracy and stability.
5. 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.
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 current-to-voltage conversion circuit with a voltage stabilizing function 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 current-to-voltage conversion circuit with a voltage stabilizing function according to an embodiment of the present invention. An embodiment of the present invention provides a current-voltage conversion circuit having a voltage stabilizing function, the current-voltage 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, an eighth resistor R8, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first zener diode D1, a second zener diode D2, a third zener diode D3, a transistor M1, 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 fifth resistor R5 and the sixth resistor R6 are connected in series between a voltage input terminal Vin and a negative input terminal of the amplifier a1 in sequence, a first end formed by connecting the first zener diode D1 and the second zener diode D2 in parallel is connected to a node formed by connecting the fifth resistor R5 and the sixth resistor R6, a second end formed by connecting the first zener diode D1 and the second zener diode D2 in parallel is connected to a ground terminal GND, a negative electrode of the first zener diode D1 is connected to a node formed by connecting the fifth resistor R5 and the sixth resistor R6, a positive electrode of the first zener diode D1 is connected to the ground terminal GND, a positive electrode of the second zener diode D2 is connected to a node formed by connecting the fifth resistor R5 and the sixth resistor R6, a negative electrode of the second zener diode D6 is connected to the ground terminal GND, and the seventh resistor R7 is connected in series between the sixth resistor R6327 and the transistor M1, the fourth resistor R4 is connected in series between the output end of the amplifier A1 and the drain electrode of the transistor M1;
the source of the transistor M1 is connected to a voltage output terminal Vout, the gate of the transistor M1 is connected to the cathode of the third zener diode D3, the anode of the third zener diode D3 is connected to a ground terminal GND, the first end formed by connecting the eighth resistor R8 and the third capacitor C3 in parallel is connected to a node formed by connecting the source of the transistor M1 and the voltage output terminal Vout, the second end formed by connecting the eighth resistor R8 and the third capacitor C3 in parallel is connected to a ground terminal (GND), and the second end formed by connecting the eighth resistor R8 and the third capacitor C3 in parallel is also connected to the anode of the third zener diode D3.
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.
Specifically, the reference voltage of the present embodiment is connected to the negative input terminal of the amplifier, and two zener diodes are disposed in the reference voltage of the current-voltage conversion circuit, which are respectively the first zener diode and the second zener diode, so that the stability of the reference voltage provided to the amplifier is improved, and the conversion stability of the current-voltage conversion circuit is improved.
Preferably, the first zener diode D1 and the second zener diode D2 are both MTZ2.0 in size.
Preferably, amplifier a1 is model LM 224.
Specifically, the voltage stabilizing module of the current-voltage conversion circuit is composed of the eighth resistor R8, the third capacitor C3, the third voltage stabilizing diode D3 and the transistor M1, and the stability of the converted voltage signal is ensured by the voltage stabilizing module, so that the current-voltage conversion circuit is not easily interfered by the outside, and the accuracy of the converted voltage is improved.
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 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 being filtered, the current signal is converted into a voltage signal by an amplifier A1 and then is output through an output terminal of an amplifier A1. 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 first voltage stabilizing diode D1 and the second voltage stabilizing diode D2 are arranged for stabilizing voltage, so that overlarge fluctuation amplitude of reference voltage is avoided, and the stability of a converted voltage signal is ensured by using the voltage stabilizing module, so that the current-voltage conversion circuit is not easily interfered by the outside, and the accuracy of the converted voltage is ensured.
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 current-to-voltage conversion circuit having a voltage stabilization function, 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), an eighth resistor (R8), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a first zener diode (D1), a second zener diode (D2), a third zener diode (D3), a transistor (M1) 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 fifth resistor (R5) and the sixth resistor (R6) are sequentially connected in series between a voltage input end (Vin) and a negative input end of the amplifier (A1), a first end formed by connecting the first zener diode (D1) and the second zener diode (D2) in parallel is connected to a node formed by connecting the fifth resistor (R5) and the sixth resistor (R6), a second end formed by connecting the first zener diode (D1) and the second zener diode (D2) in parallel is connected to a ground end (GND), a negative electrode of the first zener diode (D1) is connected to a node formed by connecting the fifth resistor (R5) and the sixth resistor (R6), a positive electrode of the first zener diode (D1) is connected to the ground end (GND), a positive electrode of the second zener diode (D2) is connected to a node formed by connecting the fifth resistor (R5) and the sixth resistor (R6), a cathode of the second zener diode (D2) is connected to a ground terminal (GND), the seventh resistor (R7) is connected in series between the sixth resistor (R6) and the drain of the transistor (M1), and the fourth resistor (R4) is connected in series between the output terminal of the amplifier (a1) and the drain of the transistor (M1);
the source of the transistor (M1) is connected to a voltage output end (Vout), the gate of the transistor (M1) is connected to the cathode of the third zener diode (D3), the anode of the third zener diode (D3) is connected to a ground end (GND), the first end formed by connecting the eighth resistor (R8) and the third capacitor (C3) in parallel is connected to a node formed by connecting the source of the transistor (M1) and the voltage output end (Vout), and the second end formed by connecting the eighth resistor (R8) and the third capacitor (C3) in parallel is connected to the ground end (GND).
2. The current-to-voltage conversion circuit of claim 1, wherein the second resistor (R2) is a sliding varistor.
3. The current-to-voltage conversion circuit of claim 1, the first zener diode (D1), the second zener diode (D2) and the third zener diode (D3) all being MTZ2.0 in model number.
4. The current to voltage conversion circuit of claim 1, the amplifier (a1) being of the type LM 224.
5. The current to voltage conversion circuit of claim 1, the fuse (F1) being a self-healing fuse.
6. The current to voltage 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 |
|---|---|---|---|
| CN201811172749.9A CN111026210A (en) | 2018-10-09 | 2018-10-09 | Current-voltage conversion circuit with voltage stabilizing function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811172749.9A CN111026210A (en) | 2018-10-09 | 2018-10-09 | Current-voltage conversion circuit with voltage stabilizing function |
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| Publication Number | Publication Date |
|---|---|
| CN111026210A true CN111026210A (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811172749.9A Withdrawn CN111026210A (en) | 2018-10-09 | 2018-10-09 | Current-voltage conversion circuit with voltage stabilizing function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111026212A (en) * | 2018-10-09 | 2020-04-17 | 西安智盛锐芯半导体科技有限公司 | Conversion circuit capable of converting current into voltage |
-
2018
- 2018-10-09 CN CN201811172749.9A patent/CN111026210A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111026212A (en) * | 2018-10-09 | 2020-04-17 | 西安智盛锐芯半导体科技有限公司 | Conversion circuit capable of converting current into voltage |
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Application publication date: 20200417 |
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