CN220752555U - Current transmission control circuit - Google Patents
Current transmission control circuit Download PDFInfo
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- CN220752555U CN220752555U CN202322370928.6U CN202322370928U CN220752555U CN 220752555 U CN220752555 U CN 220752555U CN 202322370928 U CN202322370928 U CN 202322370928U CN 220752555 U CN220752555 U CN 220752555U
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 15
- 230000007423 decrease Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
Abstract
The utility model provides a current transmission control circuit which comprises a PWM access assembly, a control assembly, an acquisition assembly and a feedback assembly which are sequentially connected. One end of the feedback component, which is far away from the acquisition component, is connected with the input end of the control component. The PWM access component is connected with PWM signals, the control component generates different transmitting currents according to the PWM signals and feedback signals of the feedback component, the acquisition component is used for acquiring the transmitting currents and generating voltage signals, and the feedback component is used for converting the voltage signals into feedback signals and feeding the feedback signals back to the control component, so that the intensity of the transmitting currents can be controlled through the PWM signals.
Description
Technical Field
The utility model relates to the technical field of transmitters, in particular to a current transmission control circuit.
Background
The current transmission of the transmitter is generally divided into two parts, one part is constant current, the current of the working circuit is limited to be constant current, and the other part is to control the transmitted current through the triode operational amplifier. For the current-transmitting part, it is common to design the relevant control circuit by LM317, but the control circuit is susceptible to temperature variations and is costly.
Therefore, the present disclosure designs a current-transmitting control circuit to solve the pain.
Disclosure of Invention
The utility model aims to provide a current transmission control circuit.
The utility model aims to solve the problem that the existing control of the transmitting current is complex.
In order to solve the problems, the utility model is realized by the following technical scheme:
the current transmission control circuit comprises a PWM access assembly, a control assembly, an acquisition assembly and a feedback assembly which are sequentially connected, wherein one end of the feedback assembly, which is far away from the acquisition assembly, is connected with the input end of the control assembly;
the PWM access component is accessed into a PWM signal, and the control component is used for generating different transmitting currents according to the PWM signal and a feedback signal of the feedback component; the acquisition component is used for acquiring the transmitting current and generating a voltage signal, and the feedback component is used for converting the voltage signal into the feedback signal and feeding the feedback signal back to the control component.
Further, the control component comprises an amplifier, and a triode with a base electrode connected with the output end of the amplifier; the non-inverting input end of the amplifier is respectively connected with the PWM access component and the feedback component, and the inverting input end of the amplifier is grounded; the collector of the triode is connected with a positive power supply, and the emitter of the triode is connected with analog ground through a fifteenth resistor.
Further, the acquisition assembly comprises a twelfth resistor, one end of the twelfth resistor is connected with one end, far away from the triode, of the fifteenth resistor, and the other end of the twelfth resistor is connected with a negative power supply.
Further, the feedback component comprises an eighth resistor, one end of the eighth resistor is connected with one end of the twelfth resistor, which is close to the negative power supply, and the other end of the eighth resistor is connected with the non-inverting input end of the amplifier.
Further, the temperature drift coefficient of the twelfth resistor is smaller than 25PPM.
Further, a seventeenth resistor is connected in series between the output end of the amplifier and the base electrode of the triode.
Further, a sixteenth resistor is connected in series between the collector of the triode and the positive power supply.
Further, the base electrode of the triode is grounded through a capacitor.
Further, the PWM access component comprises an eleventh resistor and a thirteenth resistor which are connected in series, and a second capacitor and a third capacitor which are connected in parallel with two ends of the thirteenth resistor, the other ends of the second capacitor and the third capacitor are grounded, the other end of the eleventh resistor is accessed to a PWM signal, and one end of the thirteenth resistor far away from the eleventh resistor is connected with the control component.
Compared with the prior art, the technical scheme of the utility model has the following beneficial effects:
(1) The control component generates different transmitting currents according to the PWM signals and the feedback signals of the feedback component, the acquisition component is used for acquiring the transmitting currents and generating voltage signals, and the feedback component is used for converting the voltage signals into feedback signals and feeding the feedback signals back to the control component, so that closed-loop control of output of the control component is realized, and the intensity of the transmitting currents can be controlled through the PWM signals.
(2) The utility model adopts a new circuit design to realize the control of the transmitting current, does not need to adopt LM317, and controls the cost.
(3) The acquisition resistor (twelfth resistor) adopts a resistor with a temperature drift coefficient smaller than 25PPM, so that the influence of temperature change on the transmitting current is avoided, the change of the transmitting current is controlled by a PWM signal, and the control precision is improved.
Drawings
FIG. 1 is a functional block diagram of a current transducer control circuit provided by an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a current transducer control circuit according to an embodiment of the present utility model.
The diagram is:
PWM access component-1; a control assembly-2; an acquisition component-3; feedback component-4.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, a current transmission control circuit includes a PWM access assembly, a control assembly, an acquisition assembly, and a feedback assembly connected in sequence. One end of the feedback component, which is far away from the acquisition component, is connected with the input end of the control component. The PWM access component is connected with PWM signals, the control component generates different transmitting currents according to the PWM signals and feedback signals of the feedback component, the acquisition component is used for acquiring the transmitting currents and generating voltage signals, and the feedback component is used for converting the voltage signals into feedback signals and feeding the feedback signals back to the control component, so that the intensity of the transmitting currents can be controlled through the PWM signals.
Referring to fig. 2, the control unit 2 includes an amplifier U4, and a transistor Q4 having a base connected to an output terminal of the amplifier U4. The non-inverting input end of the amplifier U4 is respectively connected with the PWM access component 1 and the feedback component 4, and the inverting input end of the amplifier U4 is grounded. The collector of the triode Q4 is connected with a positive power supply, and the emitter of the triode Q4 is connected with analog ground through a fifteenth resistor R15. When the PWM signal accessed by the PWM access component changes, the PWM signal is output to the base electrode of the triode Q4 through the output end of the amplifier U4, so that the change of the current flowing through the triode Q4 is caused. For example, when the PWM signal is small, the output voltage of the amplifier U4 is small, the base voltage of the transistor Q4 is small, that is, the base voltage of the transistor Q4 is small in voltage differential, so that the current flowing through the transistor Q4 is small, that is, the current flowing through the fifteenth resistor is small, that is, the transmitting current I is small. Similarly, when the PWM signal becomes smaller and larger, the transmission current I increases. In this embodiment, a seventeenth resistor R17 is further connected in series between the output terminal of the amplifier U4 and the base of the triode Q4, a sixteenth resistor R16 is connected in series between the collector of the triode Q4 and the positive power supply, and the base of the triode Q4 is grounded through a capacitor C1.
The acquisition component 3 comprises a twelfth resistor R12, one end of the twelfth resistor R12 is connected with one end of the fifteenth resistor R15 far away from the triode Q4, and the other end of the twelfth resistor R12 is connected with a negative power supply. The twelfth resistor R12 is connected in series with the fifteenth resistor R15, so that the magnitude of the current flowing through the twelfth resistor R12 is the same as the transmission current I of the fifteenth resistor R15, and thus the voltage of the twelfth resistor R12 is r12×the transmission current I. In this embodiment, the temperature drift coefficient of the twelfth resistor R12 is smaller than 25PPM, so that the voltage of the twelfth resistor R12 is negligible due to temperature variation, and thus the variation of the transmitting current is accurately collected.
The feedback assembly 4 includes an eighth resistor R8, one end of the eighth resistor R8 is connected to one end of the twelfth resistor R2 near the negative power supply, and the other end is connected to the non-inverting input terminal of the amplifier U4. Since the inverting input terminal of the amplifier U4 is grounded, the voltage at the non-inverting input terminal of the amplifier U4 is also regarded as 0V according to the principle of virtual short and virtual break. That is, the eighth resistor R8 is connected in parallel with the acquisition resistor (twelfth resistor R12), and thus the voltage of the eighth resistor R8 changes in accordance with the voltage of the twelfth resistor R12.
When the PWM signal is kept unchanged, the voltage of the PWM signal and the voltage of the eighth resistor R8 are counteracted positively and negatively, the non-inverting input end of the amplifier U4 is kept at 0V, and the whole control circuit is kept balanced and stable. When the voltage of the PWM signal increases and is greater than the voltage of the eighth resistor R8 (i.e., greater than the voltage of the twelfth resistor R12), the amplifier U4 increases the output voltage according to the concept of the operational amplifier being virtually short and virtually broken, thereby increasing the base voltage of the transistor Q4, and further increasing the amplifying current of the transistor Q4, i.e., increasing the transmitting current I, so as to increase the voltage across the twelfth resistor R12, i.e., increasing the voltage across the eighth resistor R8, so that the voltage at the non-inverting input terminal of the amplifier U4 approaches 0V, and a new balance and stability are achieved. Conversely, when the voltage of the PWM signal decreases to be smaller than the voltage of the eighth resistor R8 (i.e., smaller than the voltage of the twelfth resistor R12), the amplifier U4 decreases the output voltage according to the concept of the operational amplifier being virtually short and virtually broken, thereby decreasing the base voltage of the triode Q4, and further decreasing the amplifying current of the triode Q4, i.e., decreasing the transmitting current I, so as to decrease the voltages at both ends of the twelfth resistor R12, i.e., decrease the voltages at both ends of the eighth resistor R8, so that the voltage at the non-inverting input end of the amplifier U4 approaches 0V, and a new balance and stability are achieved. Thereby, the transmission current of the whole transmission circuit is controlled by the PWM signal.
In this embodiment, the PWM access component 1 includes an eleventh resistor R11 and a thirteenth resistor R13 connected in series, a second capacitor C2 and a third capacitor C3 connected in parallel to two ends of the thirteenth resistor R13, the other ends of the second capacitor C2 and the third capacitor C3 are grounded, the other end of the eleventh resistor R11 is connected to a PWM signal, one end of the thirteenth resistor R13 far away from the eleventh resistor R11 is connected to the non-inverting input end of the amplifier U4, and the PWM access component 1 filters the connected PWM signal.
According to the current transmission control circuit, the control component generates different transmission currents according to the PWM signals and the feedback signals of the feedback component, the acquisition component is used for acquiring the transmission currents and generating the voltage signals, and the feedback component is used for converting the voltage signals into the feedback signals and feeding the feedback signals back to the control component, so that closed-loop control of output of the control component is achieved, and the intensity of the transmission currents can be controlled through the PWM signals.
While the foregoing description illustrates and describes the preferred embodiments of the present utility model, it is to be understood that the utility model is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, but is capable of use in various other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept, either as described above or as a matter of skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.
Claims (9)
1. The current transmission control circuit is characterized by comprising a PWM access assembly, a control assembly, an acquisition assembly and a feedback assembly which are sequentially connected, wherein one end of the feedback assembly, which is far away from the acquisition assembly, is connected with the input end of the control assembly;
the PWM access component is accessed into a PWM signal, and the control component is used for generating different transmitting currents according to the PWM signal and a feedback signal of the feedback component; the acquisition component is used for acquiring the transmitting current and generating a voltage signal, and the feedback component is used for converting the voltage signal into the feedback signal and feeding the feedback signal back to the control component.
2. The current transmission control circuit according to claim 1, wherein the control assembly comprises an amplifier, a triode with a base connected to the output of the amplifier; the non-inverting input end of the amplifier is respectively connected with the PWM access component and the feedback component, and the inverting input end of the amplifier is grounded; the collector of the triode is connected with a positive power supply, and the emitter of the triode is connected with analog ground through a fifteenth resistor.
3. The current transmission control circuit of claim 2, wherein the acquisition assembly comprises a twelfth resistor, one end of the twelfth resistor is connected to an end of the fifteenth resistor remote from the triode, and the other end of the twelfth resistor is connected to a negative power supply.
4. The current transmission control circuit of claim 3 wherein the feedback assembly comprises an eighth resistor having one end connected to an end of the twelfth resistor adjacent the negative power source and the other end connected to the non-inverting input of the amplifier.
5. The current transducer control circuit of claim 3, wherein the twelfth resistor has a temperature coefficient of drift less than 25PPM.
6. The current transmission control circuit of claim 2, wherein a seventeenth resistor is further connected in series between the output terminal of the amplifier and the base of the transistor.
7. The current transducer control circuit of claim 2 wherein a sixteenth resistor is connected in series between the collector of the transistor and the positive power supply.
8. The current transducer control circuit of claim 2, wherein the base of the transistor is coupled to ground through a capacitor.
9. The current transmission control circuit according to claim 1, wherein the PWM access component comprises an eleventh resistor and a thirteenth resistor connected in series, a second capacitor and a third capacitor connected in parallel to two ends of the thirteenth resistor, the other ends of the second capacitor and the third capacitor are grounded, the other end of the eleventh resistor is connected with a PWM signal, and one end of the thirteenth resistor far away from the eleventh resistor is connected with the control component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322370928.6U CN220752555U (en) | 2023-09-01 | 2023-09-01 | Current transmission control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322370928.6U CN220752555U (en) | 2023-09-01 | 2023-09-01 | Current transmission control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220752555U true CN220752555U (en) | 2024-04-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322370928.6U Active CN220752555U (en) | 2023-09-01 | 2023-09-01 | Current transmission control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220752555U (en) |
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2023
- 2023-09-01 CN CN202322370928.6U patent/CN220752555U/en active Active
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