CN111641393B - Complex ground wire relation conversion circuit - Google Patents
Complex ground wire relation conversion circuit Download PDFInfo
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- CN111641393B CN111641393B CN202010567411.4A CN202010567411A CN111641393B CN 111641393 B CN111641393 B CN 111641393B CN 202010567411 A CN202010567411 A CN 202010567411A CN 111641393 B CN111641393 B CN 111641393B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
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Abstract
The invention discloses a complex ground wire relation conversion circuit, wherein the non-inverting input end of an operational amplifier U1 is connected with a voltage input, the output end of the operational amplifier U1 is connected with the base electrode of a triode Q2, the emitting electrode of the triode Q2 is grounded, the collecting electrode of the triode Q2 is connected with Vcc + and the base electrode of the triode Q1, the collecting electrode of the triode Q1 is connected with a current output, the emitting electrode of the triode Q1 is connected with Vcc +, vcc + and the emitting electrode of the triode Q1 are connected with the input end of a differential sampling circuit, the output end of the differential sampling circuit is respectively connected with a first end of a resistor R10, two ends of a resistor R11, a first end of a resistor R12 and the inverting input end of the operational amplifier U1, the resistors R10, R11 and R12 are connected in series, and one end of the resistor R11 is connected between the resistors R10 and R12. The conversion of the linear relation in the complex system becomes simple and reliable, and the converted signal has extremely high precision and extremely strong anti-interference performance.
Description
Technical Field
The invention belongs to the field of ground wire relation conversion, and relates to a complex ground wire relation conversion circuit.
Background
The current stage of the ground wire relation conversion adopts a circuit isolation means, and the circuit isolation mainly aims to cut off a noise interference path through an isolation component, so that the effect of inhibiting noise interference is achieved. After the circuit isolation measure is adopted, most circuits can achieve a good noise suppression effect, so that the equipment meets the requirement of electromagnetic compatibility. The isolation method usually used is isolation transformer or isolation chip such as optical coupler, etc., the circuit has large volume and relatively complex circuit.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a complex ground wire relation conversion circuit, so that the conversion of the ground wire relation in a complex system is simple and reliable, and the converted signal has extremely high precision and extremely strong anti-interference performance.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a complex ground wire relation conversion circuit comprises an operational amplifier U1, a triode Q2 and a differential sampling circuit;
the non inverting input end of the operational amplifier U1 is connected with the voltage input, the output end of the operational amplifier U1 is connected with the base electrode of the triode Q2, the emitting electrode of the triode Q2 is grounded, the collecting electrode of the triode Q2 is connected with Vcc + and the base electrode of the triode Q1, the collecting electrode of the triode Q1 is connected with the current output, the emitting electrode of the triode Q1 is connected with Vcc +, vcc + and the emitting electrode of the triode Q1 are connected with the input end of the differential sampling circuit, the output end of the differential sampling circuit is respectively connected with the first end of a resistor R10, the two ends of a resistor R11, the first end of a resistor R12 and the inverting input end of the operational amplifier U1, the resistor R10, the resistor R11 and the resistor R12 are connected in series, and one end of the resistor R11 is connected between the resistor R10 and the resistor R12.
Preferably, the differential sampling circuit includes a resistor R9, a resistor R13, a resistor R14, a resistor R16 and an operational amplifier U2, an emitter of the triode Q1 is connected to an inverting input terminal of the operational amplifier U2 through the resistor R13, vcc + is connected to a non-inverting input terminal of the operational amplifier U2 through the resistor R14, the non-inverting input terminal of the operational amplifier U2 is grounded through the resistor R16, one of balanced terminals of the operational amplifier U2 is connected to the resistor R12, and two ends of the resistor R11 are respectively connected to two balanced terminals of the operational amplifier U2.
Preferably, the collector of the transistor Q1 is connected to Vcc + via a resistor R1, and the collector of the transistor Q2 is connected to Vcc + via a resistor R2.
Preferably, the resistor R11 is an adjustable potentiometer.
Preferably, a capacitor C1 is connected between the inverting input terminal and the output terminal of the operational amplifier U1.
Preferably, the output end of the operational amplifier U1 is connected to the anode of a diode D1, and the cathode of the diode D1 is connected to the base of the transistor Q2.
Preferably, a resistor R6 is connected in series between the output terminal of the operational amplifier U1 and the base of the transistor Q2, and a resistor R3 is connected in series between the collector of the transistor Q2 and the base of the transistor Q1.
Preferably, the operational amplifier U1 has a model number op27.
Compared with the prior art, the invention has the following beneficial effects:
the circuit can convert a voltage signal into a current signal, so that the conversion of a linear relation in a complex system becomes simple, the differential circuit can enhance the anti-interference capability of the circuit, an interference signal is attenuated through the differential circuit, the converted signal has extremely high precision and extremely high anti-interference performance, the signal transmission distance is greatly increased, and the resistor R10, the resistor R11 and the resistor R12 help the differential sampling circuit to ensure zero output under the condition of zero input.
Further, the resistor R1 and the resistor R2 can ensure that the triode Q1 and the triode Q2 work in a linear region, and the maximum current value output by the circuit can be limited.
Further, the resistor R11 adopts an adjustable potentiometer, and the input and the output of the operational amplifier can be accurately regulated.
Further, the capacitor C1 and the operational amplifier U1 form and adjust the circuit, which is used to ensure that the steady-state error of the operational amplifier U1 is low.
Further, the diode D1 is used to improve the anti-interference capability of the circuit.
Drawings
FIG. 1 is a circuit diagram of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, the complex ground line relationship conversion circuit according to the present invention includes an operational amplifier U1, a transistor Q2, and a differential sampling circuit.
Operational amplifier U1 works in the linear region, the homophase input end receives external voltage signal and the voltage signal that the inverting input end feedbacks and carries out the comparison thereby output a definite level signal and give the back level, operational amplifier U1's homophase input end connects the voltage input, triode Q2's base is connected to operational amplifier U1's output, triode Q2's emitter ground, triode Q1's base is connected to triode Q2's collecting electrode, and connect Vcc + through resistance R2 +, triode Q1's collecting electrode connects current output, triode Q1's emitting electrode passes through resistance R1 and connects Vcc +, vcc + and triode Q1's emitting electrode all connect the input of differential sampling circuit, resistance R1 and resistance R2 can guarantee that triode Q1 and triode Q2 work in the linear region, can limit the maximum current value of circuit output.
The output end of the differential sampling circuit is connected with the first end of a resistor R10, the two ends of the resistor R11, the first end of a resistor R12 and the inverting input end of an operational amplifier U1 respectively, the resistor R10, the resistor R11 and the resistor R12 are connected in series, and one end of the resistor R11 is connected between the resistor R10 and the resistor R12. The resistor R11 adopts an adjustable potentiometer, and can accurately regulate the input and the output of the operational amplifier.
The differential sampling circuit specifically comprises a resistor R9, a resistor R13, a resistor R14, a resistor R16 and an operational amplifier U2, wherein an emitter of a triode Q1 is connected with an inverting input end of the operational amplifier U2 through the resistor R13, vcc + is connected with an non-inverting input end of the operational amplifier U2 through the resistor R14, the non-inverting input end of the operational amplifier U2 is grounded through the resistor R16, one balance end of the operational amplifier U2 is connected with a resistor R12, and two ends of the resistor R11 are respectively connected with two balance ends of the operational amplifier U2.
The operational amplifiers U1 and U2 are both op27.
And a capacitor C1 is connected between the inverting input end and the output end of the operational amplifier U1, and the capacitor C1 and the operational amplifier U1 form and are used for ensuring that the steady-state error of the operational amplifier U1 is lower.
The output end of the operational amplifier U1 is connected with the anode of a diode D1, and the cathode of the diode D1 is connected with the base electrode of a triode Q2. The diode D1 is used to improve the interference resistance of the entire circuit.
A resistor R6 is connected in series between the output end of the operational amplifier U1 and the base electrode of the triode Q2, and a resistor R3 is connected in series between the collector electrode of the triode Q2 and the base electrode of the triode Q1. The resistor R6 and the resistor R3 are current-limiting resistors and are respectively used for protecting the triode Q2 and the triode Q1.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. A complex ground wire relation conversion circuit is characterized by comprising an operational amplifier U1, a triode Q2 and a differential sampling circuit;
the non inverting input end of the operational amplifier U1 is connected with the voltage input, the output end of the operational amplifier U1 is connected with the base electrode of the triode Q2, the emitting electrode of the triode Q2 is grounded, the collecting electrode of the triode Q2 is connected with Vcc + and the base electrode of the triode Q1, the collecting electrode of the triode Q1 is connected with the current output, the emitting electrode of the triode Q1 is connected with Vcc +, vcc + and the emitting electrode of the triode Q1 are connected with the input end of the differential sampling circuit, the output end of the differential sampling circuit is respectively connected with the first end of a resistor R10, the two ends of a resistor R11, the first end of a resistor R12 and the inverting input end of the operational amplifier U1, the resistor R10, the resistor R11 and the resistor R12 are connected in series, and one end of the resistor R11 is connected between the resistor R10 and the resistor R12.
2. The complex ground wire relation conversion circuit according to claim 1, wherein the differential sampling circuit comprises a resistor R9, a resistor R13, a resistor R14, a resistor R16 and an operational amplifier U2, an emitter of the triode Q1 is connected with an inverting input terminal of the operational amplifier U2 through the resistor R13, vcc + is connected with a non-inverting input terminal of the operational amplifier U2 through the resistor R14, a non-inverting input terminal of the operational amplifier U2 is grounded through the resistor R16, one of balanced terminals of the operational amplifier U2 is connected with the resistor R12, and two balanced terminals of the resistor R11 are respectively connected with two balanced terminals of the operational amplifier U2.
3. The complex ground wire relationship conversion circuit of claim 1, wherein the collector of transistor Q1 is connected to Vcc + via resistor R1 and the collector of transistor Q2 is connected to Vcc + via resistor R2.
4. The complex ground relationship conversion circuit of claim 1, wherein the resistor R11 is an adjustable potentiometer.
5. The complex ground relationship switching circuit of claim 1 wherein a capacitor C1 is connected between the inverting input and the output of operational amplifier U1.
6. The complex ground wire relationship switching circuit of claim 1, wherein the output terminal of the operational amplifier U1 is connected to the anode of a diode D1, and the cathode of the diode D1 is connected to the base of a transistor Q2.
7. The complex ground wire relationship switching circuit according to claim 1, wherein a resistor R6 is connected in series between the output terminal of the operational amplifier U1 and the base of the transistor Q2, and a resistor R3 is connected in series between the collector of the transistor Q2 and the base of the transistor Q1.
8. The complex ground relationship conversion circuit of claim 1, wherein the operational amplifier U1 is of the type op27.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010567411.4A CN111641393B (en) | 2020-06-19 | 2020-06-19 | Complex ground wire relation conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010567411.4A CN111641393B (en) | 2020-06-19 | 2020-06-19 | Complex ground wire relation conversion circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111641393A CN111641393A (en) | 2020-09-08 |
| CN111641393B true CN111641393B (en) | 2023-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010567411.4A Active CN111641393B (en) | 2020-06-19 | 2020-06-19 | Complex ground wire relation conversion circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113114164B (en) * | 2021-04-08 | 2024-06-18 | 广州致远电子股份有限公司 | Impedance transformation network circuit structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2234875A (en) * | 1989-07-28 | 1991-02-13 | Philips Electronic Associated | Combined current differencing and operational amplifier circuit |
| CN100414810C (en) * | 2006-09-29 | 2008-08-27 | 天津市正方工业有限公司 | Voltage identification short circuit protection constant current voltage stabilizing circuit |
| CN205141289U (en) * | 2015-07-28 | 2016-04-06 | 深圳市良辉科技有限公司 | Convertible ground wire protected mode's leakage protection plug |
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