Temperature compensation circuit

Abstract

The utility model relates to the technical field of sensors, in particular to a temperature compensation circuit which comprises a thermistor NTC, a resistor R7 and a first resistor module, one end of the thermistor NTC is used for being connected with an input end IN +, the other end of the thermistor NTC is connected to the first resistor module, the other end of the first resistor module is connected to an output end OUT, and the resistor R7 is connected to the output end OUT. And one end of the resistor R7 is connected to the input end IN +, and the other end of the resistor R7 is connected to the output end OUT. The method has the effect of improving the detection accuracy of the Hall sensor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensors, and particularly to a temperature compensation circuit. BACKGROUND

[0002] With the development of electronic technology, automatic detection has become a widely used technology, and sensors are essential devices for detection. As a kind of sensor, the Hall sensor detects the magnetic field by using the Hall effect.

[0003] In the related art, when the Hall sensor is actually applied, the change of the environmental temperature will affect the resistance change of the conduction circuit, thereby causing the electric signal detected by the Hall sensor to be inaccurate. That is, the change of the environmental temperature causes the detection of the Hall sensor to be inaccurate and low in stability. CONTENT OF THE INVENTION

[0004] In order to improve the accuracy of the detection of the Hall sensor, the present application provides a temperature compensation circuit.

[0005] The temperature compensation circuit provided by the present application adopts the following technical solution:

[0006] The temperature compensation circuit comprises a thermistor NTC, a resistor R7 and a first resistance module. One end of the thermistor NTC is connected to an input end IN+, the other end of the thermistor NTC is connected to the first resistance module, the other end of the first resistance module is connected to an output end OUT, one end of the resistor R7 is connected to the input end IN+, and the other end of the resistor R7 is connected to the output end OUT.

[0007] By adopting the above technical solution, the thermistor NTC is connected in the path. By using the characteristic that the resistance of the thermistor NTC can change with the change of the environmental temperature, in combination with the resistor R7 and the first resistance module, the change of the resistance of the wire path due to the change of the environmental temperature is offset, the resistance is automatically adjusted, the resistance in the wire path can be stably maintained at the initial designed resistance, and the detection of the Hall sensor is more accurate.

[0008] Optionally, the first resistance module comprises a resistor R12 and a resistor R13. One end of the resistor R12 is connected to the thermistor NTC, the other end of the resistor R12 is connected to the resistor R13, and the other end of the resistor R13 is connected to the output end OUT.

[0009] By adopting the above technical solution, the combination with the thermistor NTC is realized to adjust the resistance, thereby avoiding the inaccurate detection of the Hall sensor due to the change of the environmental temperature.

[0010] Optionally, a second resistance module is further included, which is arranged between the first resistance module and the output terminal OUT, one end of the second resistance module is connected to the first resistance module, and the other end of the second resistance module is connected to the output terminal OUT.

[0011] Optionally, the second resistance module includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R14, a resistor R15, a resistor R16, and a resistor R17, one end of the resistor R14 is connected to the first resistance module, the other end of the resistor R14 is connected to the resistor R15, the other end of the resistor R15 is connected to the resistor R16, the other end of the resistor R16 is connected to the output terminal OUT, the resistor R1, the resistor R4, the resistor R8, and the resistor R17 are all connected in parallel with the resistor R14, the resistor R2, the resistor R5, and the resistor R9 are all connected in parallel with the resistor R15, and the resistor R3, the resistor R6, and the resistor R10 are all connected in parallel with the resistor R16.

[0012] Optionally, the thermistor NTC includes a negative temperature coefficient thermistor.

[0013] Optionally, the resistor R7 is a metal film resistor.

[0014] In summary, the present application includes at least one of the following beneficial technical effects:

[0015] 1. The thermistor NTC is connected in the path, and by using the characteristic that the resistance value of the thermistor NTC can change with the change of the ambient temperature, in combination with the resistor R7 and the first resistance module, the change of the resistance value of the wire path due to the change of the ambient temperature is offset, the resistance value is automatically adjusted, the resistance value in the wire path can be stably maintained at the initial designed resistance value, and the detection of the Hall sensor is more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the circuit principle diagram of the whole embodiment.

[0017] Legend: 1, first resistance module; 2, second resistance module. DETAILED DESCRIPTION

[0018] The following will be described in detail in combination with the accompanying Figure 1 The present application will be further described in detail.

[0019] The embodiment of the present application discloses a temperature compensation circuit. Referring toFigure 1 The temperature compensation circuit comprises a thermistor NTC, a resistor R7 and a first resistance module 1, one end of the thermistor NTC is connected to an input terminal IN+, the other end of the thermistor NTC is connected to the first resistance module 1, the other end of the first resistance module 1 is connected to an output terminal OUT, one end of the resistor R7 is connected to the input terminal IN+, and the other end of the resistor R7 is connected to the output terminal OUT.

[0020] The thermistor NTC is a negative temperature coefficient thermistor, and the resistor R7 is a metal film resistor.

[0021] The resistance of the thermistor NTC can change with the change of the ambient temperature, and by using the characteristics of the thermistor NTC and combining the resistor R7 and the first resistance module 1, the resistance of the wire path can be adjusted, so that the change of the resistance of the wire path caused by the change of the ambient temperature is avoided, the offset effect is achieved, and the detection of the Hall sensor is more accurate, and the influence of the ambient temperature is avoided.

[0022] Referring to Figure 1 The first resistance module 1 comprises a resistor R12 and a resistor R13, one end of the resistor R12 is connected to the thermistor NTC, the other end of the resistor R12 is connected to the resistor R13, and the other end of the resistor R13 is connected to the output terminal OUT.

[0023] The thermistor NTC combines the resistor R12 and the resistor R13, and by selecting the resistances of the resistor R12 and the resistor R13, the required resistance can be obtained after combination, so that the purpose of adjusting the resistance of the wire path is better achieved.

[0024] The temperature compensation circuit further comprises a second resistance module 2, which is arranged between the first resistance module 1 and the output terminal OUT, that is, one end of the second resistance module 2 is connected to the first resistance module 1, and the other end of the second resistance module 2 is connected to the output terminal OUT.

[0025] The second resistance module 2 comprises resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R14, R15, R16 and R17, one end of the resistor R14 is connected to the first resistance module 1, that is, one end of the resistor R14 is connected to the resistor R13, the other end of the resistor R14 is connected to the resistor R15, the other end of the resistor R15 is connected to the resistor R16, the other end of the resistor R16 is connected to the output terminal OUT, the resistors R1, R4, R8 and R17 are connected in parallel with the resistor R14, the resistors R2, R5 and R9 are connected in parallel with the resistor R15, and the resistors R3, R6 and R10 are connected in parallel with the resistor R16.

[0026] The second resistance module 2 is also arranged to enable selection of resistance values, and the required resistance value can be obtained through calculation, so as to obtain the required comprehensive resistance value, and when the resistance value of the thermistor NTC changes, the change of the resistance value of the wire path can be accurately offset, so that the resistance value of the wire path can be stabilized, thereby enabling the Hall sensor to accurately detect.

[0027] The implementation principle of the temperature compensation circuit in the embodiment of the present application is that the change of the ambient temperature will cause the resistance value of the wire path to change, resulting in inaccurate detection results of the Hall sensor, so the thermistor NTC is arranged, and the thermistor NTC is combined with the first resistance module 1 and the second resistance module 2 to achieve the required comprehensive resistance value, and when the ambient temperature changes, the resistance value of the thermistor NTC changes, thereby changing the comprehensive resistance value, so as to offset the change, thereby enabling the detection results of the Hall sensor to be accurate.

[0028] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A temperature compensation circuit, characterized by: The temperature sensor module comprises a negative temperature coefficient thermistor, a resistor R7 and a first resistance module (1), one end of the negative temperature coefficient thermistor is connected to an input terminal IN+, the other end of the negative temperature coefficient thermistor is connected to the first resistance module (1), the other end of the first resistance module (1) is connected to an output terminal OUT, one end of the resistor R7 is connected to the input terminal IN+, the other end of the resistor R7 is connected to the output terminal OUT.

2. A temperature compensation circuit according to claim 1, characterized in that: The first resistance module (1) comprises a resistor R12 and a resistor R13, one end of the resistor R12 is connected to the negative temperature coefficient thermistor, the other end of the resistor R12 is connected to the resistor R13, the other end of the resistor R13 is connected to the output terminal OUT.

3. The temperature compensation circuit of claim 1, wherein: The temperature sensor module further comprises a second resistance module (2), the second resistance module (2) is arranged between the first resistance module (1) and the output terminal OUT, one end of the second resistance module (2) is connected to the first resistance module (1), the other end of the second resistance module (2) is connected to the output terminal OUT.

4. A temperature compensation circuit as claimed in claim 3, characterized in that: The second resistance module (2) comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R14, a resistor R15, a resistor R16 and a resistor R17, one end of the resistor R14 is connected to the first resistance module (1), the other end of the resistor R14 is connected to the resistor R15, the other end of the resistor R15 is connected to the resistor R16, the other end of the resistor R16 is connected to the output terminal OUT, the resistor R1, the resistor R4, the resistor R8 and the resistor R17 are connected in parallel with the resistor R14, the resistor R2, the resistor R5 and the resistor R9 are connected in parallel with the resistor R15, the resistor R3, the resistor R6 and the resistor R10 are connected in parallel with the resistor R16.

5. The temperature compensation circuit of claim 1, wherein: The negative temperature coefficient thermistor comprises a negative temperature coefficient thermistor.

6. The temperature compensation circuit of claim 1, wherein: The resistor R7 is a metal film resistor.

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