CN111641393A - Complex ground wire relation conversion circuit - Google Patents
Complex ground wire relation conversion circuit Download PDFInfo
- Publication number
- CN111641393A CN111641393A CN202010567411.4A CN202010567411A CN111641393A CN 111641393 A CN111641393 A CN 111641393A CN 202010567411 A CN202010567411 A CN 202010567411A CN 111641393 A CN111641393 A CN 111641393A
- Authority
- CN
- China
- Prior art keywords
- resistor
- operational amplifier
- triode
- ground wire
- vcc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
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 voltage input, the output end of the operational amplifier U1 is connected with the base of a triode Q2, the emitter of the triode Q2 is grounded, the collector of a triode Q2 is connected with Vcc + and the base of a triode Q1, the collector of a triode Q1 is connected with current output, the emitter of a triode Q1 is connected with Vcc +, Vcc + and the emitter of a triode Q1 are both connected with the input end of a 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 R12 and the inverting input end of an operational amplifier U1, resistors R10, R11 and R12 are connected in series, and one end of a resistor. 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 ground wire relation conversion in the present stage adopts a circuit isolation means, and the circuit isolation mainly aims to cut off a path of noise interference through an isolation component, so that the effect of inhibiting the 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 an isolation transformer or an isolation chip such as an optocoupler, and the like, and the circuit has a large volume and is relatively complex.
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 Q1, a triode Q2 and a differential sampling circuit;
the non-inverting input end of the operational amplifier U1 is connected with a voltage input, the output end of the operational amplifier U1 is connected with the base of a triode Q2, the emitter of a triode Q2 is grounded, the collector of a triode Q2 is connected with Vcc + and the base of a triode Q1, the collector of a triode Q1 is connected with a current output, the emitter of a triode Q1 is connected with Vcc +, Vcc + and the emitter of a 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 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 an operational amplifier U1, the resistor R10, the resistor R11 and the resistor R12 are connected in series, and one.
Preferably, 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 a resistor R13, Vcc + is connected with a non-inverting input terminal of the operational amplifier U2 through a resistor R14, a non-inverting input terminal of the operational amplifier U2 is grounded through a resistor R16, one balanced terminal of the operational amplifier U2 is connected with a resistor R12, and two ends of the resistor R11 are respectively connected with 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 a transistor Q2.
Preferably, a resistor R6 is connected in series between the output end 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 is of type op 27.
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 is simple, the differential circuit can enhance the anti-interference capability of the circuit, the interference signal is attenuated in the form of the differential circuit, the converted signal has extremely high precision and extremely strong 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 transistor Q1 and the transistor Q2 work in a linear region, and the maximum current value output by the circuit can be limited.
Further, the resistor R11 is an adjustable potentiometer, which can accurately regulate the input and output of the operational amplifier.
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 immunity of the circuit to interference.
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 converting circuit according to the present invention includes an operational amplifier U1, a transistor Q1, a transistor Q2, and a differential sampling circuit.
The operational amplifier U1 works in a linear region, the non-inverting input end receives an external voltage signal and compares with a voltage signal fed back by the inverting input end to output a determined level signal to the rear stage, the non-inverting input end of the operational amplifier U1 is connected with a voltage input, the output end of the operational amplifier U1 is connected with the base of the triode Q2, the emitter of the triode Q2 is grounded, the collector of the triode Q2 is connected with the base of the triode Q1 and is connected with Vcc + through a resistor R2, the collector of the triode Q1 is connected with a current output, the emitter of the triode Q1 is connected with Vcc +, Vcc + and the emitter of the triode Q1 through a resistor R1, the resistor R1 and the resistor R2 can ensure that the triode Q1 and the triode Q2 work in the linear region, and the maximum current value of the 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 an 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. The resistor R11 adopts an adjustable potentiometer, and can accurately regulate the current of 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 a resistor R13, Vcc + is connected with an inverting input end of an operational amplifier U2 through a resistor R14, the inverting input end of the operational amplifier U2 is grounded through a 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.
Operational amplifier U1 and operational amplifier U2 are both op 27.
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 a regulating circuit which is 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 of a triode Q2. The diode D1 is used to improve the interference rejection of the circuit as a whole.
A resistor R6 is connected in series between the output end of the operational amplifier U1 and the base of the triode Q2, and a resistor R3 is connected in series between the collector of the triode Q2 and the base of the triode Q1. The resistor R6 and the resistor R3 are current limiting resistors and are respectively used for protecting the transistor Q2 and the transistor 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 Q1, a triode Q2 and a differential sampling circuit;
the non-inverting input end of the operational amplifier U1 is connected with a voltage input, the output end of the operational amplifier U1 is connected with the base of a triode Q2, the emitter of a triode Q2 is grounded, the collector of a triode Q2 is connected with Vcc + and the base of a triode Q1, the collector of a triode Q1 is connected with a current output, the emitter of a triode Q1 is connected with Vcc +, Vcc + and the emitter of a 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 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 an operational amplifier U1, the resistor R10, the resistor R11 and the resistor R12 are connected in series, and one.
2. The complex ground wire relationship converting circuit of 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 a transistor Q1 is connected to an inverting input terminal of the operational amplifier U2 through a resistor R13, Vcc + is connected to a non-inverting input terminal of the operational amplifier U2 through a resistor R14, a non-inverting input terminal of the operational amplifier U2 is grounded through a resistor R16, one of balanced terminals of the operational amplifier U2 is connected to a resistor R12, and two ends of the resistor R11 are respectively connected to 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 + through resistor R1 and the collector of transistor Q2 is connected to Vcc + through resistor R2.
4. The complex ground wire relationship conversion circuit of claim 1, wherein the resistor R11 is an adjustable potentiometer.
5. The complex ground wire relationship switching circuit of claim 1 wherein a capacitor C1 is connected between the inverting input and the output of the 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 of 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 wire relationship conversion circuit of claim 1, wherein the model of the operational amplifier U1 is op 27.
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 true CN111641393A (en) | 2020-09-08 |
| CN111641393B CN111641393B (en) | 2023-02-21 |
Family
ID=72332540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010567411.4A Active CN111641393B (en) | 2020-06-19 | 2020-06-19 | Complex ground wire relation conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111641393B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113114164A (en) * | 2021-04-08 | 2021-07-13 | 广州致远电子有限公司 | Impedance transformation network circuit structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8917340D0 (en) * | 1989-07-28 | 1989-09-13 | Philips Electronic Associated | Combined current differencing and operational amplifier circuit |
| CN1949622A (en) * | 2006-09-29 | 2007-04-18 | 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 |
-
2020
- 2020-06-19 CN CN202010567411.4A patent/CN111641393B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8917340D0 (en) * | 1989-07-28 | 1989-09-13 | Philips Electronic Associated | Combined current differencing and operational amplifier circuit |
| CN1949622A (en) * | 2006-09-29 | 2007-04-18 | 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 |
Non-Patent Citations (1)
| Title |
|---|
| 石晓伟等: "核电站用高精度双通道电流/电压转换装置研究设计", 《计算机测量与控制》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113114164A (en) * | 2021-04-08 | 2021-07-13 | 广州致远电子有限公司 | Impedance transformation network circuit structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111641393B (en) | 2023-02-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108768380B (en) | Conditioning circuit of sensor | |
| CN208316688U (en) | A kind of weak current amplification module | |
| CN111641393B (en) | Complex ground wire relation conversion circuit | |
| CN201616023U (en) | Signal isolation conversion output module | |
| CN219122300U (en) | Current transducer | |
| CN201549065U (en) | Linear photoelectric isolator with passive input | |
| CN209247858U (en) | A kind of built-in voltage electric current one transmitter | |
| CN110247645A (en) | A kind of voltage comparator | |
| CN113242036B (en) | CTR (control line) adjustable method, optocoupler circuit and device | |
| CN210775634U (en) | Alternating current detection circuit | |
| CN209215973U (en) | A kind of High Precision Low Temperature drift bipolarity Multichannel constant-current source circuit | |
| CN208537628U (en) | Power frequency detection circuit, air conditioner and grid-connected system | |
| CN216697093U (en) | High-precision voltage-current conversion circuit | |
| CN218630599U (en) | Anti-irradiation isolated 4-20mA steady-state power supply circuit | |
| CN109030937B (en) | Power frequency detection circuit, air conditioner and grid-connected system | |
| CN220985514U (en) | Voltage loop control circuit and switching power supply | |
| CN219266789U (en) | Isolated 4-20mA output circuit | |
| CN215378892U (en) | Zero point and full scale regulating circuit and circuit board | |
| CN218352397U (en) | Circuit for solving EMC through current compensation | |
| CN220440571U (en) | High-precision voltage feedback circuit for base station rectifying module | |
| CN204731672U (en) | Low noise low-power consumption LDO circuit | |
| CN109798984B (en) | GGD low-voltage switchgear generating line contact temperature-detecting device | |
| CN115932363B (en) | Offset voltage adjustable high-side current detection circuit | |
| CN113804959B (en) | High-precision high-speed weak current measurement circuit and measurement method based on transimpedance amplification | |
| CN202494718U (en) | Voltage sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |