CN213688719U - Thermal resistance detection circuit based on bridge balance - Google Patents
Thermal resistance detection circuit based on bridge balance Download PDFInfo
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- CN213688719U CN213688719U CN202022339402.8U CN202022339402U CN213688719U CN 213688719 U CN213688719 U CN 213688719U CN 202022339402 U CN202022339402 U CN 202022339402U CN 213688719 U CN213688719 U CN 213688719U
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- detection circuit
- thermal resistance
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Abstract
The utility model discloses a thermal resistance detection circuitry based on electric bridge is balanced, include that thermal resistance detects technical field: the circuit comprises a detection circuit, an output circuit and a bridge balance circuit, wherein the output circuit is connected to the detection circuit, and the bridge balance circuit is connected to the output circuit; the bridge balancing circuit includes: the power supply of one end of the first capacitor is grounded; a second capacitor connected in parallel with the first capacitor, the detection circuit comprising: a first resistor; the K end on the integrated circuit is connected to the first resistor, and the A end on the integrated circuit is grounded; the second resistance, the one end of second resistance is connected to on the first resistance, the second resistance with integrated circuit connects in parallel, the utility model discloses utilize the balanced principle of electric bridge, change the resistance value into voltage signal, the convenient measurement.
Description
Technical Field
The utility model relates to a thermal resistance detects technical field, specifically is a thermal resistance detection circuitry based on electric bridge is balanced.
Background
Thermal resistance is one of the most commonly used temperature detectors in the medium and low temperature regions. Thermal resistance thermometry is based on the property that the resistance of a metal conductor increases with increasing temperature. Its main features are high measuring accuracy and stable performance. Among them, the platinum thermistor has the highest measurement accuracy, and is widely used in industrial temperature measurement and is made into a standard reference instrument. The thermal resistor is mostly made of pure metal materials, platinum and copper are most widely used at present, and nickel, manganese, rhodium and other materials are used for manufacturing the thermal resistor. The metal thermal resistor is made of a plurality of commonly used temperature sensing materials, and the most commonly used temperature sensing material is a platinum wire. The metal thermal resistance material for industrial measurement includes copper, nickel, iron-nickel, etc. in addition to platinum wire.
The existing thermal resistor detection is to connect the thermal resistor into a circuit, detect the thermal resistor through a detection circuit, output the detected resistance value after being amplified through an operational amplifier, and measure inconveniently due to observation of inconvenient numerical values in the measuring process.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a thermal resistance detection circuitry based on bridge is balanced to the current thermal resistance who proposes in solving above-mentioned background detects with the thermal resistance access to the circuit, detects the thermal resistance through detection circuitry, and the resistance value after the detection passes through operational amplifier and enlargies the back output, and the observation of inconvenient numerical value in the measurement process is not convenient for measuring problem.
In order to achieve the above object, the utility model provides a following technical scheme: a bridge balancing based thermal resistance detection circuit comprising: the circuit comprises a detection circuit, an output circuit and a bridge balance circuit, wherein the output circuit is connected to the detection circuit, and the bridge balance circuit is connected to the output circuit;
the bridge balancing circuit includes:
the power supply of one end of the first capacitor is grounded;
a second capacitor in parallel with the first capacitor.
Preferably, the first capacitor and the second capacitor are both 0603-100nf capacitors.
Preferably, the detection circuit includes:
a first resistor;
the K end on the integrated circuit is connected to the first resistor, and the A end on the integrated circuit is grounded;
one end of the second resistor is connected to the first resistor, and the second resistor is connected with the integrated circuit in parallel;
the third resistor is connected with the second resistor in series, the third resistor and the second resistor are both connected with a VREF end on the integrated circuit, and the power supply at the other end of the third resistor is grounded;
a fourth resistor connected to the first resistor, the fourth resistor being connected in parallel with the second resistor;
a fifth resistor connected to the first resistor, the fifth resistor being in parallel with the fourth resistor;
a sixth resistor in series with the fifth resistor.
Preferably, the output circuit includes:
an operational amplifier;
a seventh resistor connected to a positive terminal of the operational amplifier;
an eighth resistor connected to a negative terminal of the operational amplifier;
a ninth resistor, connected between the eighth resistor and the operational amplifier, and having the other end grounded;
a tenth resistor connected between the seventh resistor and the operational amplifier, and the other end of the tenth resistor is connected to the a terminal of the operational amplifier.
Preferably, the first resistor is 0603-5.1K resistor, the second resistor is 3.26K1% resistor, and the third resistor is 47K1% resistor.
Preferably, the fourth resistor and the fifth resistor are both 2.80K50pmm resistors, and the sixth resistor is a 100R resistor.
Preferably, the integrated circuit is a TL431PCK integrated circuit.
Preferably, the seventh resistor and the eighth resistor are both 0603-1K resistors.
Preferably, the ninth resistor and the tenth resistor are both 0603-100K resistors.
Preferably, the operational amplifier is an LM324PW operational amplifier.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses utilize the balanced principle of electric bridge, convert the resistance value into voltage signal, the convenient measurement, when PT 100's resistance equals R28, electric potential V1 between R18 and the PT100 equals with electric potential V2 between R19/R28, when PT 100's resistance changes, the voltage difference between V1 and the V2 will be enlargied through operational amplifier to input the balanced circuit of electric bridge, carry out analog-to-digital conversion.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a schematic diagram of the detection circuit of the present invention;
FIG. 3 is a schematic diagram of an output circuit of the present invention;
fig. 4 is a schematic diagram of the bridge balancing circuit of the present invention.
In the figure: the circuit comprises a 100 detection circuit, a 200 output circuit, a 300 bridge balancing circuit, a C1 first capacitor, a C2 second capacitor, an R2 first resistor, a U11 integrated circuit, an R21 second resistor, an R23 third resistor, an R18 fourth resistor, an R19 fifth resistor, an R28 sixth resistor, a U10A operational amplifier, an R9 seventh resistor, an R20 eighth resistor, an R24 ninth resistor and an R1 tenth resistor.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a thermal resistance detection circuitry based on bridge is balanced utilizes the balanced principle of bridge, converts the resistance value into voltage signal, the convenient measurement, please refer to figure 1, include: the detection circuit 100, the output circuit 200, the bridge balancing circuit 300, the first resistor R2, the integrated circuit U11, the second resistor R21, the third resistor R23, the fourth resistor R18, the fifth resistor R19, the sixth resistor R28, the operational amplifier U10A, the seventh resistor R9, the eighth resistor R20, the ninth resistor R24 and the tenth resistor R1;
referring to fig. 1 again, the output circuit 200 is connected to the detection circuit 100, and the bridge balancing circuit 300 is connected to the output circuit 200;
referring to fig. 1-2, the detection circuit 100 includes:
one end of the first resistor R2 is connected with a power supply, and the first resistor R2 is a 0603-5.1K resistor;
the K end of the integrated circuit U11 is connected to the first resistor R2, the A end of the integrated circuit U11 is grounded, and the integrated circuit U11 is a TL431PCK integrated circuit;
one end of a second resistor R21 is connected to the first resistor R2, the second resistor R21 is connected with the integrated circuit U11 in parallel, and the second resistor R21 is 3.26K1% of resistance;
the third resistor R23 is connected in series with the second resistor R21, the third resistor R23 and the second resistor R21 are both connected with a VREF end on the integrated circuit U11, the power supply at the other end of the third resistor R23 is grounded, and the third resistor R23 is 47K1% resistor;
the fourth resistor R18 is connected to the first resistor R2, the fourth resistor R18 is connected with the second resistor R21 in parallel, the fourth resistor R18 is a 2.80K50pmm resistor, and the other end of the fourth resistor R18 is connected with the positive end of the thermal resistor;
the fifth resistor R19 is connected to the first resistor R2, the fifth resistor R19 is connected in parallel with the fourth resistor R18, and the fifth resistor R19 is a 2.80K50pmm resistor;
the sixth resistor R28 is connected in series with the fifth resistor R19, the sixth resistor R28 is a 100R resistor, and the other end of the sixth resistor R28 is connected with the negative electrode end of the thermal resistor;
referring to fig. 1-3, the output circuit 200 includes:
operational amplifier U10A is LM324PW operational amplifier;
the seventh resistor R9 is connected to the positive terminal of the operational amplifier U10A, the seventh resistor R9 is a 0603-1K resistor, and the other end of the seventh resistor R9 is connected to the fourth resistor R18;
the eighth resistor R20 is connected to the negative terminal of the operational amplifier U10A, the eighth resistor R20 is a 0603-1K resistor, and the eighth resistor R20 is connected between the fifth resistor R19 and the sixth resistor R28;
the ninth resistor R24 is connected between the eighth resistor R20 and the operational amplifier U10A, the other end of the ninth resistor R24 is grounded, and the ninth resistor R24 is a 0603-100K resistor;
a tenth resistor R1, wherein the tenth resistor R1 is connected between the seventh resistor R9 and the operational amplifier U10A, the other end of the tenth resistor R1 is connected to the A end of the operational amplifier U10A, and the tenth resistor R1 is a 0603-100K resistor;
referring to fig. 1, 3 and 4, the bridge balancing circuit 300 is connected to the a terminal of the operational amplifier U10A, and includes:
one end of the first capacitor C1 is grounded, and the other end of the first capacitor C1 is connected with a power supply;
the second capacitor C2 is connected in parallel with the first capacitor C1, the other end of the second capacitor C2 is connected with a power supply, when the resistance of the PT100 is equal to R28, the potential V1 between the R18 and the PT100 is equal to the potential V2 between the R19/R28, and when the resistance of the PT100 changes, the voltage difference between the V1 and the V2 is amplified by an operational amplifier and is input to a bridge balance circuit for analog-to-digital conversion.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the various features of the disclosed embodiments of the present invention can be used in any combination with each other, and the description of such combinations is not exhaustive in the present specification only for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A thermal resistance detection circuit based on bridge balance is characterized in that: the method comprises the following steps: a detection circuit (100), an output circuit (200) and a bridge balancing circuit (300), the output circuit (200) being connected to the detection circuit (100), the bridge balancing circuit (300) being connected to the output circuit (200);
the bridge balancing circuit (300) comprises:
a first capacitor (C1), one end of the first capacitor (C1) is connected with the ground;
a second capacitance (C2), the second capacitance (C2) being in parallel with the first capacitance (C1).
2. The bridge balancing based thermal resistance detection circuit of claim 1, wherein: the first capacitor (C1) and the second capacitor (C2) are both 0603-100nf capacitors.
3. The bridge balancing based thermal resistance detection circuit of claim 1, wherein: the detection circuit (100) comprises:
a first resistance (R2);
an integrated circuit (U11), a terminal K on the integrated circuit (U11) is connected to the first resistor (R2), and a terminal A on the integrated circuit (U11) is grounded;
a second resistor (R21), one end of the second resistor (R21) is connected to the first resistor (R2), and the second resistor (R21) is connected with the integrated circuit (U11) in parallel;
a third resistor (R23), wherein the third resistor (R23) is connected with the second resistor (R21) in series, the third resistor (R23) and the second resistor (R21) are both connected with a VREF end on the integrated circuit (U11), and the other end of the third resistor (R23) is grounded;
a fourth resistor (R18), the fourth resistor (R18) being connected to the first resistor (R2), the fourth resistor (R18) being connected in parallel with the second resistor (R21);
a fifth resistor (R19), the fifth resistor (R19) being connected to the first resistor (R2), the fifth resistor (R19) being connected in parallel with the fourth resistor (R18);
a sixth resistor (R28), the sixth resistor (R28) being in series with the fifth resistor (R19).
4. The bridge balancing based thermal resistance detection circuit of claim 1, wherein: the output circuit (200) comprises:
an operational amplifier (U10A);
a seventh resistor (R9), the seventh resistor (R9) being connected to the positive terminal of the operational amplifier (U10A);
an eighth resistor (R20), the eighth resistor (R20) connected to the negative terminal of the operational amplifier (U10A);
a ninth resistor (R24), the ninth resistor (R24) is connected between the eighth resistor (R20) and the operational amplifier (U10A), and the other end of the ninth resistor (R24) is grounded;
a tenth resistor (R1), the tenth resistor (R1) is connected between the seventh resistor (R9) and the operational amplifier (U10A), and the other end of the tenth resistor (R1) is connected to the A end of the operational amplifier (U10A).
5. The bridge balancing based thermal resistance detection circuit of claim 3, wherein: the first resistor (R2) is 0603-5.1K resistor, the second resistor (R21) is 3.26K1% resistor, and the third resistor (R23) is 47K1% resistor.
6. The bridge balancing based thermal resistance detection circuit of claim 3, wherein: the fourth resistor (R18) and the fifth resistor (R19) are both 2.80K50pmm resistors, and the sixth resistor (R28) is a 100R resistor.
7. The bridge balancing based thermal resistance detection circuit of claim 3, wherein: the integrated circuit (U11) is a TL431PCK integrated circuit.
8. The bridge balancing based thermal resistance detection circuit of claim 4, wherein: the seventh resistor (R9) and the eighth resistor (R20) are both 0603-1K resistors.
9. The bridge balancing based thermal resistance detection circuit of claim 4, wherein: the ninth resistor (R24) and the tenth resistor (R1) are both 0603-100K resistors.
10. The bridge balancing based thermal resistance detection circuit of claim 4, wherein: the operational amplifier (U10A) is an LM324PW operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022339402.8U CN213688719U (en) | 2020-10-20 | 2020-10-20 | Thermal resistance detection circuit based on bridge balance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022339402.8U CN213688719U (en) | 2020-10-20 | 2020-10-20 | Thermal resistance detection circuit based on bridge balance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213688719U true CN213688719U (en) | 2021-07-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022339402.8U Active CN213688719U (en) | 2020-10-20 | 2020-10-20 | Thermal resistance detection circuit based on bridge balance |
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| Country | Link |
|---|---|
| CN (1) | CN213688719U (en) |
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- 2020-10-20 CN CN202022339402.8U patent/CN213688719U/en active Active
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