CN218916370U - Inductive sensor - Google Patents
Inductive sensor Download PDFInfo
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- CN218916370U CN218916370U CN202123357697.2U CN202123357697U CN218916370U CN 218916370 U CN218916370 U CN 218916370U CN 202123357697 U CN202123357697 U CN 202123357697U CN 218916370 U CN218916370 U CN 218916370U
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- branch
- power supply
- amplifier
- circuit chip
- inductive sensor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model discloses an inductive sensor, which comprises two input ends, wherein the two input ends are connected in parallel with a filter capacitor and then connected into two output ends of a mirror image circuit chip, the two input ends of the mirror image circuit chip are used as two branches, a first branch is connected in parallel with a power supply branch and a grounding branch and then connected in parallel with a second branch which is connected in series with a reference resistor R1, the connection part of the first branch and the second branch is connected with the first input end of an amplifier, the second input end of the amplifier is connected with a constant voltage branch, and the output end of the amplifier is provided with a comparison resistor R5 which is connected with the second input end of the amplifier. By adopting the design scheme of the utility model, the application of the mirror circuit chip plays a vital role in stabilizing signals, a circuit can be utilized to provide constant current bias for current, and after an object is sensed, parameters change, and the comparator circuit is formed by an operational amplifier.
Description
Technical Field
The utility model relates to the field of sensors, in particular to an inductive sensor.
Background
The existing inductive sensor is realized by directly passing through an inductor, is closer to detection of analog signals, is unstable in signals and low in accuracy, and cannot perform bidirectional detection due to the design of a single magnetic core.
Disclosure of Invention
The utility model aims to: the utility model aims to solve the problems of unstable signals and low accuracy of the existing inductive sensor.
The technical scheme is as follows: in order to achieve the above purpose, the present utility model provides the following technical solutions:
the utility model provides an inductive sensor, including two input that are used for detecting the measured object, two input connects in parallel behind the filter capacitor C1 two outputs of mirror image circuit chip D1, two inputs of mirror image circuit chip D1 are two branches, behind first branch parallel power branch and the ground branch with established ties reference resistance R1's second branch parallelly connected, the first input of amplifier U1 is connected to first branch and second branch junction, constant voltage branch is connected to amplifier U1's second input, amplifier U1's output has the comparison resistance R5 who is connected to the second input of amplifier.
Further, the power supply branch includes a power supply VCC and a current limiting resistor R8 connected in series with the power supply VCC.
Further, the ground connection circuit is used as a filtering branch circuit, and comprises a ground GND and a filtering capacitor C2 connected in series with the ground GND.
Further, the constant voltage branch comprises a power supply, the power supply comprises a power supply voltage VCC and a power supply ground GND which are connected in parallel, and the power supply voltage VCC and the power supply ground GND are connected in series with a current limiting resistor.
Further, the model of the mirror circuit chip D1 is BCV61, parameters of two transistors in the mirror circuit chip D1 are identical, emitters of the two transistors are used as output ends of the mirror circuit chip D1, and collectors of the two transistors are used as input ends of the mirror circuit chip D1.
Further, the amplifier U1 is of the model LM258D.
Working principle: the principle of the mirror circuit is that the two transistors have identical parameters, and because the two transistors are connected in reverse series to obtain the reverse series end, i.e. the currents of the bases are identical, and VCC is directly connected between the two transistors, the voltages VCE of the two transistors from the bases to the emitters are identical, the emitters of the two transistors are grounded, and when beta is larger, the base current can BE ignored, so the collector current I C2 of the unconnected power supply is approximately equal to the resistor Rcurrent IREF of the reference current connected with VCC in series, namely
I C2≈I REF＝(VCC-V BE)/R＝VCC/R。
Correspondingly, in the application, a mirror current chip is connected with the sensing part, the VCC is connected to the current limiting resistor R8 to play a role of current limiting, and then is connected to the reference resistor R1, so that the current at the R1 is the same as the current at the first branch, but when the sensing end senses, a voltage difference occurs at the sensing end, at this time, the reference resistor R1 is kept the same as the first branch, constant current bias occurs at the reference resistor R1, and then a comparator circuit formed by an amplifier is used for processing signals and transmitting the signals to the signal processing part.
The beneficial effects are that: compared with the prior art, the utility model has the advantages that:
by adopting the design scheme of the utility model, the application of the mirror circuit chip plays a vital role in stabilizing signals, a circuit can be utilized to provide constant current bias for current, and after an object is sensed, parameters change, and the comparator circuit is formed by an operational amplifier.
Drawings
Fig. 1 is a circuit diagram of the present utility model.
Detailed Description
The present utility model is further illustrated in the accompanying drawings and detailed description which are to be understood as being merely illustrative of the utility model and not limiting of its scope, and various modifications of the utility model, which are equivalent to those skilled in the art upon reading the utility model, will fall within the scope of the utility model as defined in the appended claims.
Examples
As shown in figure 1, an inductive sensor comprises two input ends for detecting an object to be detected, wherein the two input ends are connected in parallel with a filter capacitor C1 and then connected into two output ends of a mirror circuit chip D1, the two input ends of the mirror circuit chip D1 are used as two branches, a first branch is connected in parallel with a power supply branch and a grounding branch and then connected in parallel with a second branch connected in series with a reference resistor R1, the connection part of the first branch and the second branch is connected with a first input end of an amplifier U1, the second input end of the amplifier U1 is connected with a constant voltage branch, and the output end of the amplifier U1 is provided with a comparison resistor R5 connected to the second input end of the amplifier.
C1＝102μf，R1＝123Ω，R5＝334Ω。
The power supply branch comprises a power supply VCC and a current limiting resistor R8 connected in series with the power supply VCC.
R8＝681Ω。
The grounding path is used as a filtering branch and comprises a grounding GND and a filtering capacitor C2 connected in series with the grounding GND.
C2＝502μf。
The constant voltage branch circuit comprises a power supply, wherein the power supply comprises a power supply voltage VCC and a power supply ground GND which are connected in parallel, and the power supply voltage VCC and the power supply ground GND are connected in series with a current-limiting resistor.
R4＝104Ω，R6＝473Ω。
The model of the mirror circuit chip D1 is BCV61, parameters of two transistors in the mirror circuit chip D1 are identical, emitters of the two transistors are used as output ends of the mirror circuit chip D1, and collectors of the two transistors are used as input ends of the mirror circuit chip D1.
The amplifier U1 is model LM258D.
Working principle: the principle of the mirror circuit is that the two transistors have identical parameters, and because the two transistors are connected in reverse series to obtain the reverse series end, i.e. the currents of the bases are identical, and VCC is directly connected between the two transistors, the voltages VCE of the two transistors from the bases to the emitters are identical, the emitters of the two transistors are grounded, and when beta is larger, the base current can BE ignored, so the collector current I C2 of the unconnected power supply is approximately equal to the resistor Rcurrent IREF of the reference current connected with VCC in series, namely
I C2≈I REF＝(VCC-V BE)/R＝VCC/R。
Correspondingly, in the application, a mirror current chip is connected with the sensing part, the VCC is connected to the current limiting resistor R8 to play a role of current limiting, and then is connected to the reference resistor R1, so that the current at the R1 is the same as the current at the first branch, but when the sensing end senses, a voltage difference occurs at the sensing end, at this time, the reference resistor R1 is kept the same as the first branch, constant current bias occurs at the reference resistor R1, and then a comparator circuit formed by an amplifier is used for processing signals and transmitting the signals to the signal processing part.
Claims (6)
1. An inductive sensor, characterized by: the device comprises two input ends for detecting an object to be detected, wherein the two input ends are connected with a filter capacitor C1 in parallel and then connected with two output ends of a mirror image circuit chip D1, the two input ends of the mirror image circuit chip D1 are used as two branches, a first branch is connected with a power supply branch in parallel and a second branch which is connected with a reference resistor R1 in series in parallel after being grounded, the connection part of the first branch and the second branch is connected with a first input end of an amplifier U1, the second input end of the amplifier U1 is connected with a constant voltage branch, and the output end of the amplifier U1 is provided with a comparison resistor R5 which is connected with the second input end of the amplifier.
2. The inductive sensor of claim 1, wherein: the power supply branch comprises a power supply VCC and a current limiting resistor R8 connected in series with the power supply VCC.
3. The inductive sensor of claim 1, wherein: the grounding path is used as a filtering branch and comprises a grounding GND and a filtering capacitor C2 connected in series with the grounding GND.
4. The inductive sensor of claim 1, wherein: the constant voltage branch circuit comprises a power supply, wherein the power supply comprises a power supply voltage VCC and a power supply ground GND which are connected in parallel, and the power supply voltage VCC and the power supply ground GND are connected in series with a current-limiting resistor.
5. The inductive sensor of claim 1, wherein: the model of the mirror circuit chip D1 is BCV61, parameters of two transistors in the mirror circuit chip D1 are identical, emitters of the two transistors are used as output ends of the mirror circuit chip D1, and collectors of the two transistors are used as input ends of the mirror circuit chip D1.
6. The inductive sensor of claim 1, wherein: the amplifier U1 is model LM258D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123357697.2U CN218916370U (en) | 2021-12-29 | 2021-12-29 | Inductive sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123357697.2U CN218916370U (en) | 2021-12-29 | 2021-12-29 | Inductive sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218916370U true CN218916370U (en) | 2023-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123357697.2U Active CN218916370U (en) | 2021-12-29 | 2021-12-29 | Inductive sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218916370U (en) |
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2021
- 2021-12-29 CN CN202123357697.2U patent/CN218916370U/en active Active
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