CN215768763U - Voltage detection sampling circuit - Google Patents
Voltage detection sampling circuit Download PDFInfo
- Publication number
- CN215768763U CN215768763U CN202121829405.8U CN202121829405U CN215768763U CN 215768763 U CN215768763 U CN 215768763U CN 202121829405 U CN202121829405 U CN 202121829405U CN 215768763 U CN215768763 U CN 215768763U
- Authority
- CN
- China
- Prior art keywords
- voltage
- circuit
- impedance
- output end
- resistor
- 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.)
- Active
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model provides a voltage detection sampling circuit, comprising: the controller is provided with an analog-to-digital conversion chip and a control chip which are connected; a sensor circuit capable of acquiring a voltage of a target to be measured and obtaining a detected signal; an impedance circuit connected to the sensor circuit and the controller, the impedance circuit including at least two impedances connected in series, the impedance circuit being capable of performing voltage division processing on the signal to be detected; and a reference circuit connected to the impedance circuit, the reference circuit being capable of supplying a reference voltage for stepping up the detected signal subjected to the voltage division processing to the impedance circuit. The voltage detection sampling circuit is reasonable and ingenious in structural design, and realizes amplification of the collected signals; the dependence on the operational amplifier is avoided, the product cost is greatly reduced compared with the operational amplifier, and the high-level sampling precision is kept. The problems of high cost and low precision when the operational amplifier is used are solved, and the market competitiveness is greatly improved.
Description
Technical Field
The utility model relates to the technical field of signal detection and sampling, in particular to a voltage detection sampling circuit.
Background
Operational amplifiers (op-amps for short) are circuit units with very high amplification. In an actual circuit, a certain functional module is usually formed together with a feedback circuit. It is an amplifier with special coupling circuit and feedback. The output signal may be the result of mathematical operations such as addition, subtraction or differentiation, integration, etc. of the input signal.
In the field of voltage signal acquisition, there is a communicating problem: when the signal collected by the sensor is small (the voltage collected by the current sensor is only about 0.02V), the reference value of the controller is 2V and cannot be met, and the analog-to-digital conversion chip cannot have high accuracy for the small signal;
furthermore, the existing voltage signal sampling method is to amplify the measured signal to a voltage range with higher precision of the analog-to-digital conversion chip and a voltage range supported by the controller by using the characteristics of the operational amplifier; that is, the small signal is amplified by an operational amplifier and then sent to the controller.
The utility model discloses the people is realizing utility model technical scheme's in-process in the embodiment of this application, discovers that above-mentioned technique has following technical problem at least:
namely, the scheme of voltage detection sampling, the operational amplifier is high in cost, and meanwhile, the application range of signal sampling is very wide, so that the selling price of a series of products is increased; but if the operational amplifier is not used, the accuracy of signal sampling is lowered; furthermore, in order to improve the market competitiveness, an amplification scheme and a signal sampling scheme replacing the operational amplifier are urgently needed.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned problems of high cost of using an operational amplifier and low accuracy when not using an operational amplifier, the present invention has been made to provide a voltage detection sampling circuit that overcomes or at least partially solves the above-mentioned problems.
According to an aspect of the present invention, there is provided a voltage detection sampling circuit including:
the controller is provided with an analog-to-digital conversion chip and a control chip which are connected;
a sensor circuit capable of acquiring a voltage of a target to be measured and obtaining a detected signal;
an impedance circuit connected to the sensor circuit and the controller, the impedance circuit including at least two impedances connected in series, the impedance circuit being capable of performing voltage division processing on the signal to be detected;
and a reference circuit connected to the impedance circuit, the reference circuit being capable of supplying a reference voltage for stepping up the detected signal subjected to the voltage division processing to the impedance circuit.
Preferably, the impedance circuit includes:
a first impedance connected to the reference circuit;
a second impedance connected in series with the first impedance, a ground terminal of the second impedance being connected to the sensor circuit;
and an amplified signal output end is led out from one end of the second impedance connected with the first impedance, and is used for outputting the detected signal which is subjected to voltage division processing and is lifted.
Preferably, the analog-to-digital conversion chip and the control chip are both connected with the amplified signal output end.
Preferably, the first impedance and the second impedance are both voltage dividing resistors.
Preferably, the reference circuit includes:
a first resistor connected to a supply voltage input terminal;
the cathode of the three-terminal regulator is connected with the first resistor, the anode of the three-terminal regulator is grounded, a reference voltage output end is led out from the reference electrode of the three-terminal regulator, and the reference voltage output end is connected with the impedance circuit;
and the reference voltage output end is also connected with the cathode of the three-terminal regulator.
Preferably, the reference circuit includes:
a first resistor connected to a supply voltage input terminal;
the cathode of the three-terminal regulator is connected with the first resistor, the anode of the three-terminal regulator is grounded, a reference voltage output end is led out from the reference electrode of the three-terminal regulator, and the reference voltage output end is connected with the impedance circuit;
the reference voltage output end is also connected with the cathode of the three-terminal voltage stabilizer, a second resistor is connected in series between the reference voltage output end and the reference electrode of the three-terminal voltage stabilizer, and a third resistor is connected in parallel between the reference voltage output end and the anode of the three-terminal voltage stabilizer.
Preferably, the reference circuit includes:
the voltage stabilizing chip is characterized in that a voltage input pin of the voltage stabilizing chip is connected with a power supply voltage input end, a voltage output pin of the voltage stabilizing chip is connected with a reference voltage output end, and the reference voltage output end is connected with the impedance circuit;
the grounding pin of the voltage stabilizing chip is grounded, and a first capacitor is connected in parallel between the grounding pin of the voltage stabilizing chip and the reference voltage output end.
Preferably, the sensor circuit includes:
a first sensing resistor connectable to the target under test;
one end of the second induction resistor is connected with the first induction resistor, and the other end of the second induction resistor is grounded;
and a detected signal output end is led out from one end of the second induction resistor connected with the first induction resistor.
Preferably, the model of the three-terminal regulator is TL 431.
Preferably, the voltage stabilization chip comprises a 7805 three-terminal voltage stabilization integrated circuit.
The utility model has the beneficial effects that: the voltage detection sampling circuit is reasonable and ingenious in structural design, the voltage or the current of a detected target is acquired through the sensor circuit, a detected signal which changes along with the change of the voltage or the current of the detected target is obtained, the detected signal is subjected to voltage division through the impedance circuit, and finally, the reference voltage is provided for the impedance circuit through the reference circuit, so that the detected signal subjected to the voltage division is heightened, and the amplification of the acquired signal is realized; the dependence on the operational amplifier is avoided, and a reference circuit is also required to be built because the operational amplifier also needs to provide reference voltage; that is, the cost of the voltage detection sampling circuit is reduced to the cost of an impedance circuit compared with an operational amplifier, and the impedance circuit is generally composed of resistors, so that the product cost is greatly reduced, and the high-level sampling precision is kept. The problems of high cost and low precision when the operational amplifier is not used are solved, and the market competitiveness is greatly improved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of a voltage detection sampling circuit according to an embodiment of the present invention;
FIG. 2 is a circuit schematic of a first embodiment of a reference circuit of the present invention;
FIG. 3 is a circuit schematic of a second embodiment of the reference circuit of the present invention;
FIG. 4 is a circuit schematic of a third embodiment of the reference circuit of the present invention;
FIG. 5 is a circuit schematic of a sensor circuit in an embodiment of the utility model;
fig. 6 is a schematic circuit diagram of the voltage detection sampling circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 6, according to another aspect of the present invention, an embodiment of the present invention provides a voltage detection sampling circuit according to an aspect of the present invention, including:
a controller 6 having an analog-to-digital conversion chip and a control chip connected thereto;
a sensor circuit 1 capable of acquiring a voltage of a target to be measured and obtaining a detected signal;
an impedance circuit 2 connected to the sensor circuit 1 and the controller 6, including at least two impedances connected in series, the impedance circuit 2 being capable of performing voltage division processing on the signal to be detected;
and a reference circuit 3 connected to the impedance circuit 2, the reference circuit 3 being capable of supplying a reference voltage Vref for stepping up the detected signal subjected to the voltage division processing to the impedance circuit 2.
Specifically, the voltage detection sampling circuit acquires the voltage or current of the target to be detected through the sensor circuit 1, and obtains a detected signal which changes along with the change of the voltage or current of the target to be detected, wherein the detected signal is generally a voltage signal;
dividing the voltage of the detected signal by the impedance circuit 2, and finally providing a reference voltage Vref to the impedance circuit 2 by the reference circuit 3 to heighten the detected signal subjected to voltage division processing, so as to amplify the acquired signal; the dependence on the operational amplifier is avoided, and because the operational amplifier also needs to provide the reference voltage Vref, the reference circuit 3 also needs to be built; that is, the present voltage detection sampling circuit reduces the cost to the cost of the impedance circuit 2 compared to the operational amplifier, and the impedance circuit 2 is generally composed of resistors, which greatly reduces the product cost and maintains a high level of sampling accuracy.
Preferably, the impedance circuit 2 includes:
a first impedance R4 connected to the reference circuit 3;
a second impedance R5 connected in series with the first impedance R4, a ground terminal of the second impedance R5 being connected to the sensor circuit 1;
an amplified signal output end is led out from one end of the second impedance R5 connected with the first impedance R4, and the amplified signal output end is used for outputting the detected signal which is subjected to voltage division processing and is padded up.
Specifically, the first impedance R4 and the second impedance R5 are connected in series to divide the voltage, so as to realize the voltage dividing function of the impedance circuit 2; when the reference voltage Vref is supplied to the impedance circuit 2, the ground is connected to the sensor through the second impedance R5, and the signal of the detection signal changes, so that the small detection signal is stepped up, and the signal is amplified.
Further, the impedance circuit 2 includes at least two impedances connected in series; if only one is adopted, the sensor circuit 1 or the reference circuit 3 is equivalent to be directly connected to an analog-to-digital conversion chip, and the amplification function of the detected signal cannot be realized.
Furthermore, the arrangement of the first impedance R4 and the second impedance R5 is the solution with the lowest cost without affecting the performance of the voltage detection sampling circuit.
Preferably, the first impedance R4 and the second impedance R5 are voltage dividing resistors.
Preferably, the analog-to-digital conversion chip ADC and the control chip Fb are both connected to the amplified signal output terminal.
Preferably, the reference circuit 3 includes:
a first resistor R3 connected to a supply voltage input;
the cathode of the three-terminal regulator is connected with the first resistor, the anode of the three-terminal regulator is grounded, a reference voltage Vref output end is led out from the reference electrode of the three-terminal regulator, and the reference voltage Vref output end is connected with the impedance circuit 2;
and the reference voltage Vref output end is also connected with the cathode of the three-terminal regulator.
Specifically, the three-terminal regulator is TL431, and the reference voltage Vref output by the reference circuit 3 is 2.5V by setting the resistance of the first resistor R3. The reference circuit 3 is provided to provide a stable reference voltage Vref output.
Optionally, the reference circuit 3 includes:
a first resistor R3 connected to a supply voltage input terminal Vcc;
a three-terminal regulator, the cathode of which is connected with the first resistor R3, the anode of which is grounded, and the reference electrode of which leads out a reference voltage Vref output end which is connected with the impedance circuit 2;
the reference voltage Vref output end is also connected with the cathode of the three-terminal regulator, a second resistor R7 is connected in series between the reference voltage Vref output end and the reference electrode of the three-terminal regulator, and a third resistor R76 is connected in parallel between the reference voltage Vref output end and the anode of the three-terminal regulator.
Specifically, the reference voltage Vref output by the reference circuit 3 is:
preferably, the reference circuit 3 includes:
a voltage input pin of the voltage stabilizing chip IC1 is connected with a power supply voltage input terminal Vcc, a voltage output pin of the voltage stabilizing chip IC1 is connected with a reference voltage Vref output terminal, and the reference voltage Vref output terminal is connected with the impedance circuit 2;
the ground pin of the voltage regulation chip IC1 is grounded, and a first capacitor C1 is connected in parallel between the ground pin of the voltage regulation chip IC1 and the output terminal of the reference voltage Vref.
Specifically, the regulator chip IC1 includes a 7805 three-terminal regulator integrated circuit, and the reference voltage Vref output by the reference voltage Vref output terminal is determined by a Lod power supply chip that supplies a supply voltage to a voltage input pin of the regulator chip IC 1. The first capacitor C1 also functions as a voltage regulator.
Preferably, the sensor circuit 1 is a voltage sensor, which includes:
a first sensing resistor R1 connectable with the target under test;
one end of the second sensing resistor R2 is connected with the first sensing resistor R1, and the other end of the second sensing resistor R2 is grounded;
and a detected signal output end is led out from one end of the second sensing resistor R2 connected with the first sensing resistor R1.
Specifically, a first inductive resistor R1 connectable to the main circuit 4 of the object to be measured, and configured to collect a voltage of the main circuit 4 of the object to be measured via the first inductive resistor R1 and the second inductive resistor R2; the detected signal output terminal is connected to the impedance circuit 2. Through the arrangement of the first sensing resistor R1, the adverse effect of a circuit connected with the detected signal output end on the detected target is effectively avoided.
When the device is used, the sensor circuit 1 collects the voltage of a detected target and obtains a detected signal;
the impedance circuit 2 acquires the detected signal and performs voltage division processing on the detected signal through a first impedance R4 and a second impedance R5;
the reference circuit 3 provides a reference voltage Vref to the impedance circuit 2 to step up the detected signal after voltage division processing;
the analog-to-digital conversion chip ADC acquires the detected signal which is subjected to voltage division processing and is lifted, and outputs the detected signal after analog-to-digital conversion;
and calculating the voltage or current of the detected object acquired by the sensor circuit 1 according to the detected signal subjected to voltage division and lifted, the value of the reference voltage Vref and the resistance values of the first impedance R4 and the second impedance R5.
Specifically, the detected signal is a voltage that varies following a voltage or current variation of the object to be detected; when the sensor circuit 1 is a voltage sensor, the detected signal is a voltage divided by the second sensing resistor R2; when the sensor circuit 1 is a current sensor, the detected signal is a voltage on a third sensing resistor Rsense;
further, the reference circuit 3, when providing the reference voltage Vref to the impedance circuit 2, further includes:
after the reference voltage Vref is divided by the first resistor R4 and the second resistor R5, the divided voltage on the second resistor R5 boosts the detected signal after the voltage division processing, thereby amplifying the detected signal;
further, the voltage or the current of the target to be detected collected by the sensor circuit 1 is calculated according to the detected signal subjected to voltage division and boosted, the value of the reference voltage Vref, and the resistance values of the first impedance R4 and the second impedance R5, and the specific process is as follows:
when the sensor circuit 1 is a voltage sensor, assuming that the reference voltage Vref output by the reference circuit 3 is Vref, the sensor circuit 1 collects the voltage of the target to be measured, i.e., the voltage of Vout, Vfb is the detected signal which is subjected to voltage division processing and is stepped up, and the relationship between Vfb and Vout is as follows:
when Vout changes, Vfb voltage changes accordingly, and the voltage of the target to be measured acquired by the sensor circuit 1 is calculated according to the above relationship.
When in use, the sensor circuit 1 is connected to a main circuit 4 of a measured object; the sensor circuit 1 acquires the voltage of a detected object and obtains a detected signal, and the detected signal is output from a detected signal output end;
the impedance circuit 2 acquires the detected signal and performs voltage division processing on the detected signal through a first impedance R4 and a second impedance R5;
the reference circuit 3 provides a reference voltage Vref to the impedance circuit 2, after the reference voltage Vref is divided by the first impedance R4 and the second impedance R5, the divided voltage on the second impedance R5 pads up the detected signal after the voltage division processing, thereby amplifying the detected signal;
the analog-to-digital conversion chip ADC acquires the detected signal which is subjected to voltage division processing and is lifted, and outputs the detected signal after analog-to-digital conversion;
according to the detected signal subjected to voltage division and boosted, the value of the reference voltage Vref and the resistance values of the first and second resistors R4, R5, according to the formula
And calculating the voltage or current of the measured object acquired by the sensor circuit 1.
The voltage detection sampling circuit is reasonable and ingenious in structural design, the voltage or the current of a detected target is acquired through the sensor circuit 1, a detected signal which changes along with the change of the voltage or the current of the detected target is obtained, the detected signal is subjected to voltage division through the impedance circuit 2, and finally the reference voltage Vref is provided for the impedance circuit 2 through the reference circuit 3, so that the detected signal subjected to the voltage division is heightened, and the amplification of the acquired signal is realized; the dependence on the operational amplifier is avoided, and because the operational amplifier also needs to provide the reference voltage Vref, the reference circuit 3 also needs to be built; that is, the present voltage detection sampling circuit reduces the cost to the cost of the impedance circuit 2 compared to the operational amplifier, and the impedance circuit 2 is generally composed of resistors, which greatly reduces the product cost and maintains a high level of sampling accuracy. The problems of high cost and low precision when the operational amplifier is not used are solved, and the market competitiveness is greatly improved.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
The principle and the implementation mode of the utility model are explained by applying specific embodiments in the utility model, and the description of the embodiments is only used for helping to understand the method and the core idea of the utility model; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A voltage detection sampling circuit, comprising:
the controller is provided with an analog-to-digital conversion chip and a control chip which are connected;
a sensor circuit capable of acquiring a voltage of a target to be measured and obtaining a detected signal;
an impedance circuit connected to the sensor circuit and the controller, the impedance circuit including at least two impedances connected in series, the impedance circuit being capable of performing voltage division processing on the signal to be detected;
and a reference circuit connected to the impedance circuit, the reference circuit being capable of supplying a reference voltage for stepping up the detected signal subjected to the voltage division processing to the impedance circuit.
2. The voltage detection sampling circuit of claim 1, wherein the impedance circuit comprises:
a first impedance connected to the reference circuit;
a second impedance connected in series with the first impedance, a ground terminal of the second impedance being connected to the sensor circuit;
and an amplified signal output end is led out from one end of the second impedance connected with the first impedance, and is used for outputting the detected signal which is subjected to voltage division processing and is lifted.
3. The voltage detection sampling circuit according to claim 2, wherein the analog-to-digital conversion chip and the control chip are both connected to the amplified signal output terminal.
4. The voltage detection sampling circuit according to claim 2, wherein the first impedance and the second impedance are both voltage dividing resistors.
5. The voltage detection sampling circuit of claim 1, wherein the reference circuit comprises:
a first resistor connected to a supply voltage input terminal;
the cathode of the three-terminal regulator is connected with the first resistor, the anode of the three-terminal regulator is grounded, a reference voltage output end is led out from the reference electrode of the three-terminal regulator, and the reference voltage output end is connected with the impedance circuit;
and the reference voltage output end is also connected with the cathode of the three-terminal regulator.
6. The voltage detection sampling circuit of claim 1, wherein the reference circuit comprises:
a first resistor connected to a supply voltage input terminal;
the cathode of the three-terminal regulator is connected with the first resistor, the anode of the three-terminal regulator is grounded, a reference voltage output end is led out from the reference electrode of the three-terminal regulator, and the reference voltage output end is connected with the impedance circuit;
the reference voltage output end is also connected with the cathode of the three-terminal voltage stabilizer, a second resistor is connected in series between the reference voltage output end and the reference electrode of the three-terminal voltage stabilizer, and a third resistor is connected in parallel between the reference voltage output end and the anode of the three-terminal voltage stabilizer.
7. The voltage detection sampling circuit of claim 1, wherein the reference circuit comprises:
the voltage stabilizing chip is characterized in that a voltage input pin of the voltage stabilizing chip is connected with a power supply voltage input end, a voltage output pin of the voltage stabilizing chip is connected with a reference voltage output end, and the reference voltage output end is connected with the impedance circuit;
the grounding pin of the voltage stabilizing chip is grounded, and a first capacitor is connected in parallel between the grounding pin of the voltage stabilizing chip and the reference voltage output end.
8. The voltage detection sampling circuit of claim 1, wherein the sensor circuit comprises:
a first sensing resistor connectable to the target under test;
one end of the second induction resistor is connected with the first induction resistor, and the other end of the second induction resistor is grounded;
and a detected signal output end is led out from one end of the second induction resistor connected with the first induction resistor.
9. The voltage detection sampling circuit of claim 5, wherein the three-terminal regulator is model TL 431.
10. The voltage detection sampling circuit of claim 7, wherein the voltage regulation chip comprises a 7805 three-terminal voltage regulation integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121829405.8U CN215768763U (en) | 2021-08-06 | 2021-08-06 | Voltage detection sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121829405.8U CN215768763U (en) | 2021-08-06 | 2021-08-06 | Voltage detection sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215768763U true CN215768763U (en) | 2022-02-08 |
Family
ID=80072585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121829405.8U Active CN215768763U (en) | 2021-08-06 | 2021-08-06 | Voltage detection sampling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215768763U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113671244A (en) * | 2021-08-06 | 2021-11-19 | 优利德科技(中国)股份有限公司 | Amplification module, detection sampling device and signal sampling amplification method |
-
2021
- 2021-08-06 CN CN202121829405.8U patent/CN215768763U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113671244A (en) * | 2021-08-06 | 2021-11-19 | 优利德科技(中国)股份有限公司 | Amplification module, detection sampling device and signal sampling amplification method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20140009178A1 (en) | Impedance measuring device | |
| CN215768763U (en) | Voltage detection sampling circuit | |
| CN215768762U (en) | Current detection sampling circuit | |
| US20120316817A1 (en) | Measurement circuit for measuring direct current resistance of inductor | |
| CN103376364A (en) | Output impedance test device | |
| CN110609072A (en) | Weak signal detection circuit of Prussian blue membrane bioelectrode | |
| CN112034918A (en) | AVS voltage regulating circuit and device | |
| CN111257654A (en) | Alternating current electric field measuring device | |
| CN105576959A (en) | Dynamic voltage automatic adjustment circuit and method | |
| CN109239453B (en) | Input power detection circuit | |
| CN113671244A (en) | Amplification module, detection sampling device and signal sampling amplification method | |
| CN109510457B (en) | Output voltage adjustable power supply circuit and gas data acquisition equipment | |
| CN218633914U (en) | Sensor data acquisition device | |
| CN217693352U (en) | Coupling detection system for detecting radio frequency power value of equipment | |
| CN101441236A (en) | Capacity sensor circuit based on Wien bridge and phase-locked loop | |
| CN107861427A (en) | Signal processing apparatus and signal processing method | |
| CN214953827U (en) | Low-voltage power supply instrument | |
| CN210952307U (en) | Corrugated paper production drying device | |
| CN210774126U (en) | Detection device based on temperature and humidity sensor | |
| CN212540441U (en) | Automatic zero setting circuit of sensor | |
| KR101001865B1 (en) | Contactless sensor circuit | |
| CN211979062U (en) | Electronic and electrical test system | |
| KR101001863B1 (en) | Contactless sensor circuit | |
| CN206805225U (en) | Wireless strain capture card | |
| CN205643669U (en) | Magnetic field intensity detects external member |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |