High-precision low-temperature-drift Hall current sensor circuit

Abstract

The utility model discloses a high-precision low-temperature drift Hall current sensor circuit, which comprises a first power supply conversion module, a first programmable Hall H1 and a signal processing module, and the first programmable Hall H1 is electrically connected with the first power supply conversion module and the signal processing module respectively. According to the high-precision low-temperature-drift Hall current sensor circuit, through cooperative arrangement of the first power supply conversion module, the first programmable Hall H1 and the signal processing module, the precision and the temperature drift performance of a current sensor are improved, the product cost is controlled, the cost performance of the product is improved, and the product competitiveness is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of current sensors, and particularly relates to a high-precision and low-temperature-drift Hall current sensor circuit. Background Technique

[0002] The Hall current sensor is a magnetic field sensor based on the Hall effect, which can convert the detected magnetic field change into an electrical signal output. As an important current detection technology, with the rapid development of fields such as industrial automation, automotive electronics, and new energy, the demand for current detection is also increasing continuously, which has promoted the rapid growth of the Hall current sensor market. With the high-quality development of fields such as industrial automation and automotive electronics, the requirements for the accuracy of sensors applied therein are also continuously improving. At the same time, with the expansion of the application environment, along with the change of temperature, the improvement of the temperature drift performance of the Hall current sensor will also become an important development trend. For enterprises, to improve market competitiveness, it is necessary to continuously improve product performance, especially the accuracy and temperature drift performance of Hall sensors, while controlling product costs and improving the cost performance of products to ensure product competitiveness.

[0003] Based on the above situation, the utility model proposes a high-precision and low-temperature-drift Hall current sensor circuit, which can effectively solve the above problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide a high-precision and low-temperature-drift Hall current sensor circuit. The high-precision and low-temperature-drift Hall current sensor circuit of the utility model is convenient to use. Through the coordinated setting among the first power conversion module, the first programmable Hall H1, and the signal processing module, the accuracy and temperature drift performance of the current sensor are improved, while controlling product costs and improving the cost performance of products, and increasing product competitiveness.

[0005] The utility model is realized through the following technical solutions:

[0006] A high-precision and low-temperature-drift Hall current sensor circuit includes a first power conversion module, a first programmable Hall H1, and a signal processing module. The first programmable Hall H1 is electrically connected to the first power conversion module and the signal processing module respectively;

[0007] The signal processing module includes a first operational amplifier U1, a second operational amplifier U2, a third operational amplifier U3, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twenty-fourth resistor RA, a twenty-fifth resistor RB, and a twenty-sixth resistor RC;

[0008] Pin 1 of the first operational amplifier U1 is electrically connected to one end of the seventh resistor R7 and one end of the ninth resistor R9 respectively. The other end of the seventh resistor R7 is electrically connected to pin 4 of the first programmable Hall element H1. Pin 2 of the first operational amplifier U1 is electrically connected to one end of the eighth resistor R8 and the tenth resistor R10 respectively. The other end of the eighth resistor R8 is electrically connected to pin 3 of the first programmable Hall element H1. The other end of the ninth resistor R9 is electrically connected to pin 3 of the first operational amplifier U1 and one end of the fifteenth resistor R15 respectively. The other end of the fifteenth resistor R15 is electrically connected to one end of the sixteenth resistor R16 and one end of the seventeenth resistor R17 respectively. The other end of the sixteenth resistor R16 is electrically connected to one end of the thirteenth resistor R13 and pin 3 of the second operational amplifier U2 respectively. The other end of the thirteenth resistor R13 is electrically connected to the eleventh resistor R11 and pin 1 of the second operational amplifier U2 respectively. Pin 2 of the second operational amplifier U2 is electrically connected to the twelfth resistor R12 and the fourteenth resistor R14 respectively. The other end of the seventeenth resistor R17 is electrically connected to pin 2 of the third operational amplifier U3. Pin 1 of the third operational amplifier U3 is electrically connected to one end of the eighteenth resistor R18 and one end of the nineteenth resistor R19 respectively. The other end of the eighteenth resistor R18 is electrically connected to the twenty-fourth resistor RA and the twenty-fifth resistor RB respectively. The other end of the nineteenth resistor R19 is electrically connected to one end of the twenty-sixth resistor RC. The other end of the twenty-sixth resistor RC is electrically connected to pin 3 of the third operational amplifier U3.

[0009] The purpose of the present utility model is to provide a high-precision and low-temperature-drift Hall current sensor circuit. The high-precision and low-temperature-drift Hall current sensor circuit of the present utility model is convenient to use. Through the coordinated setting among the first power conversion module, the first programmable Hall element H1 and the signal processing module, the precision and temperature-drift performance of the current sensor are improved. At the same time, the product cost is controlled, the cost performance of the product is improved, and the competitiveness of the product is increased.

[0010] Preferably, the first power conversion module includes a first power reference chip D1, a first PNP transistor Q1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1 and a second capacitor C2;

[0011] One end of the first capacitor C1 is electrically connected to one end of the fourth resistor R4 and one end of the fifth resistor R5 respectively, and the other end is electrically connected to one end of the first resistor R1, the 2nd pin of the first power reference chip D1, the collector of the first PNP transistor Q1, and one end of the second capacitor C2 respectively. The other end of the fourth resistor R4 is electrically connected to the other end of the fifth resistor R5, one end of the second resistor R2, one end of the third resistor R3, the emitter of the first PNP transistor Q1, the other end of the second capacitor C2, and the 1st pin of the first programmable Hall H1 respectively. The other end of the second resistor R2 is electrically connected to the 1st pin of the first power reference chip D1 and the other end of the first resistor R1 respectively. The 3rd pin of the first power reference chip D1 is electrically connected to the other end of the third resistor R3 and the base of the first PNP transistor Q1 respectively.

[0012] Preferably, it includes a second power conversion module and a second programmable Hall H2, and the second programmable Hall H2 is electrically connected to the second power conversion module and the signal processing module respectively.

[0013] Preferably, the second power conversion module includes a second power reference chip D2, a second PNP transistor Q2, a sixth resistor R6, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a third capacitor C3, and a fourth capacitor C4;

[0014] One end of the third capacitor C3 is electrically connected to one end of the twentieth resistor R20 and one end of the twenty-first resistor R21 respectively. The other end of the twentieth resistor R20 is electrically connected to one end of the sixth resistor R6, one end of the twenty-second resistor R22, the emitter of the second PNP transistor Q2, one end of the fourth capacitor C4, and the 1st pin of the second programmable Hall H2 respectively. The other end of the sixth resistor R6 is electrically connected to the 1st pin of the second power reference chip D2 and one end of the twenty-third resistor R23 respectively. The other end of the twenty-second resistor R22 is electrically connected to the 3rd pin of the second power reference chip D2 and the base of the second PNP transistor Q2 respectively. The other end of the third capacitor C3 is electrically connected to the other end of the twenty-third resistor R23, the 2nd pin of the second power reference chip D2, the collector of the second PNP transistor Q2, and the other end of the fourth capacitor C4 respectively.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0016] The high-precision and low-temperature-drift Hall current sensor circuit of the present invention is convenient to use. Through the coordinated setting among the first power conversion module, the first programmable Hall H1, and the signal processing module, the accuracy and temperature drift performance of the current sensor are improved. At the same time, the product cost is controlled, the cost performance of the product is improved, and the competitiveness of the product is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the circuit schematic diagram of the present utility model. Specific embodiments

[0018] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the preferred implementation solutions of the present utility model will be described below in conjunction with specific embodiments. However, it should be understood that the drawings are only for illustrative purposes and cannot be construed as a limitation on this patent; in order to better illustrate this embodiment, some components in the drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as a limitation on this patent.

[0019] Embodiment 1:

[0020] As Figure 1 shown, the present utility model provides a high-precision low-temperature-drift Hall current sensor circuit, including a first power conversion module, a first programmable Hall H1 and a signal processing module. The first programmable Hall H1 is electrically connected to the first power conversion module and the signal processing module respectively;

[0021] The programmable Hall can achieve highly customized magnetic field detection. Performance parameters such as sensitivity and temperature drift compensation coefficient can be flexibly set according to specific application requirements. It helps to optimize the sensor performance including detection accuracy and temperature drift compensation and can reduce costs. In addition, the programmable Hall has a built-in reference voltage, which provides a stable voltage reference for the sensor and plays a key role in Hall effect sensors.

[0022] The programmable Hall also has a reference voltage, which can provide a fixed voltage value for the sensor, enabling the sensor to accurately measure the change of the magnetic field. By comparing the difference between the Hall voltage and the reference voltage, the intensity and direction of the magnetic field can be determined. With this stable reference voltage, it helps to reduce measurement errors and improve the accuracy and reliability of the sensor. The programmable Hall reference voltage has a certain temperature coefficient. By matching it with the temperature characteristics of the sensor, compensation for temperature changes can be achieved, thereby improving the performance of the sensor in different temperature environments.

[0023] The signal processing module includes a first operational amplifier U1, a second operational amplifier U2, a third operational amplifier U3, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twenty-fourth resistor RA, a twenty-fifth resistor RB, and a twenty-sixth resistor RC;

[0024] Pin 1 of the first operational amplifier U1 is electrically connected to one end of the seventh resistor R7 and one end of the ninth resistor R9 respectively. The other end of the seventh resistor R7 is electrically connected to pin 4 of the first programmable Hall element H1. Pin 2 of the first operational amplifier U1 is electrically connected to one end of the eighth resistor R8 and the tenth resistor R10 respectively. The other end of the eighth resistor R8 is electrically connected to pin 3 of the first programmable Hall element H1. The other end of the ninth resistor R9 is electrically connected to pin 3 of the first operational amplifier U1 and one end of the fifteenth resistor R15 respectively. The other end of the fifteenth resistor R15 is electrically connected to one end of the sixteenth resistor R16 and one end of the seventeenth resistor R17 respectively. The other end of the sixteenth resistor R16 is electrically connected to one end of the thirteenth resistor R13 and pin 3 of the second operational amplifier U2 respectively. The other end of the thirteenth resistor R13 is electrically connected to the eleventh resistor R11 and pin 1 of the second operational amplifier U2 respectively. Pin 2 of the second operational amplifier U2 is electrically connected to the twelfth resistor R12 and the fourteenth resistor R14 respectively. The other end of the seventeenth resistor R17 is electrically connected to pin 2 of the third operational amplifier U3. Pin 1 of the third operational amplifier U3 is electrically connected to one end of the eighteenth resistor R18 and one end of the nineteenth resistor R19 respectively. The other end of the eighteenth resistor R18 is electrically connected to the twenty-fourth resistor RA and the twenty-fifth resistor RB respectively. The other end of the nineteenth resistor R19 is electrically connected to one end of the twenty-sixth resistor RC. The other end of the twenty-sixth resistor RC is electrically connected to pin 3 of the third operational amplifier U3.

[0025] The signal processing circuit includes a first differential operation circuit, a second differential operation circuit, and an adjustment circuit.

[0026] The first differential operation circuit includes the first operational amplifier U1, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, and the fifteenth resistor R15. The second differential operation circuit includes the second operational amplifier U2, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, and the sixteenth resistor R16.

[0027] Wherein it is designed that R9 = R10 = R13 = R14, and R7 = R8 = R11 = R12

[0028]

[0029] The differential operation circuit can effectively suppress the common-mode signal. In practical applications, many interferences and noises often exist in the form of common-mode. The differential operation circuit can greatly reduce the influence of these common-mode factors, thereby improving the quality and accuracy of the signal. Through this circuit, the processing of two-channel Hall differential signals can be realized, and the voltage value VHALL that can represent the magnitude of the primary current can be obtained.

[0030] The adjustment circuit includes a third operational amplifier U3, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twenty-fourth resistor RA, a twenty-fifth resistor RB, and a twenty-sixth resistor RC. According to the circuit design,

[0031]

[0032] the VHALL voltage can be compensated and amplified. Through the formula, RA and RB can achieve zero-point adjustment, and RC can achieve gain adjustment.

[0033] Embodiment 2:

[0034] As Figure 1 shown, the present utility model provides a high-precision low-temperature-drift Hall current sensor circuit, which includes a first power conversion module, a first programmable Hall H1, and a signal processing module. The first programmable Hall H1 is electrically connected to the first power conversion module and the signal processing module respectively;

[0035] The signal processing module includes a first operational amplifier U1, a second operational amplifier U2, a third operational amplifier U3, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twenty-fourth resistor RA, a twenty-fifth resistor RB, and a twenty-sixth resistor RC;

[0036] Pin 1 of the first operational amplifier U1 is electrically connected to one end of the seventh resistor R7 and one end of the ninth resistor R9. The other end of the seventh resistor R7 is electrically connected to pin 4 of the first programmable Hall element H1. Pin 2 of the first operational amplifier U1 is electrically connected to one end of the eighth resistor R8 and the tenth resistor R10. The other end of the eighth resistor R8 is electrically connected to pin 3 of the first programmable Hall element H1. The other end of the ninth resistor R9 is electrically connected to pin 3 of the first operational amplifier U1 and one end of the fifteenth resistor R15. The other end of the fifteenth resistor R15 is electrically connected to one end of the sixteenth resistor R16 and one end of the seventeenth resistor R17. The other end of the sixteenth resistor R16 is electrically connected to one end of the thirteenth resistor R13 and pin 3 of the second operational amplifier U2. The other end of the thirteenth resistor R13 is electrically connected to the eleventh resistor R11 and pin 1 of the second operational amplifier U2. Pin 2 of the second operational amplifier U2 is electrically connected to the twelfth resistor R12 and the fourteenth resistor R14. The other end of the seventeenth resistor R17 is electrically connected to pin 2 of the third operational amplifier U3. Pin 1 of the third operational amplifier U3 is electrically connected to one end of the eighteenth resistor R18 and one end of the nineteenth resistor R19. The other end of the eighteenth resistor R18 is electrically connected to the twenty-fourth resistor RA and the twenty-fifth resistor RB. The other end of the nineteenth resistor R19 is electrically connected to one end of the twenty-sixth resistor RC. The other end of the twenty-sixth resistor RC is electrically connected to pin 3 of the third operational amplifier U3.

[0037] The first power conversion module includes a first power reference chip D1, a first PNP transistor Q1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, and a second capacitor C2;

[0038] One end of the first capacitor C1 is electrically connected to one end of the fourth resistor R4 and one end of the fifth resistor R5, and the other end is electrically connected to one end of the first resistor R1, pin 2 of the first power reference chip D1, the collector of the first PNP transistor Q1, and one end of the second capacitor C2. The other end of the fourth resistor R4 is electrically connected to the other end of the fifth resistor R5, one end of the second resistor R2, one end of the third resistor R3, the emitter of the first PNP transistor Q1, the other end of the second capacitor C2, and pin 1 of the first programmable Hall element H1. The other end of the second resistor R2 is electrically connected to pin 1 of the first power reference chip D1 and the other end of the first resistor R1. Pin 3 of the first power reference chip D1 is electrically connected to the other end of the third resistor R3 and the base of the first PNP transistor Q1.

[0039] The first capacitor C1 filters the power supply VCC to be converted, and the second capacitor C2 filters the converted output power supply. The functions of the two capacitors are the same, and they can effectively filter out circuit noise, stabilize the voltage, and smooth the output voltage, which helps to improve the reliability and accuracy of the Hall output for detecting the magnetic field and ensure the performance of the sensor.

[0040] The first resistor R1, the second resistor R2, the fourth resistor R4, and the first power supply reference chip D1 are designed to obtain an output power supply of 5V. Among them, the fourth resistor R4 is a current-limiting resistor, which needs to be calculated based on the magnitude of the power supply VCC to be converted and the output power supply, and mainly limits the power supply reference chip to work within the optimal working current range. Taking the power supply reference chip with a reference voltage Vref = 2.5V as an example, to obtain a 5V voltage, according to the conversion formula of the reference voltage chip, the output power supply VCC5

[0041]

[0042] By selecting R2 = R1, the output power supply of 5V can be obtained through the first power supply reference chip D1.

[0043] The reference voltage chip can provide a high-precision and stable voltage output. Supplying this power supply to the first programmable Hall H1 can ensure the accuracy and reliability of the operation of the first programmable Hall H1. At the same time, the reference voltage chip has good temperature stability and can still maintain the constancy of the output voltage at different ambient temperatures. This is crucial for improving the temperature drift performance. At the same time, the reference voltage chip is small in size and easy to integrate, reducing the complexity and cost of the design.

[0044] However, the voltage load-bearing capacity provided by the reference voltage chip is poor, and it is necessary to use the fifth resistor R5, the third resistor R3, and the first PNP transistor Q1 to achieve current amplification. The weak input signal current enters the base of the transistor, causing a change in the base current. Through the amplification effect of the transistor, the collector current will change significantly accordingly, thus achieving the amplification of the input signal.

[0045] Furthermore, in another embodiment, it includes a second power conversion module and a second programmable Hall H2. The second programmable Hall H2 is electrically connected to the second power conversion module and the signal processing module respectively.

[0046] Furthermore, in another embodiment, the second power conversion module includes a second power supply reference chip D2, a second PNP transistor Q2, a sixth resistor R6, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a third capacitor C3, and a fourth capacitor C4;

[0047] One end of the third capacitor C3 is electrically connected to one end of the twentieth resistor R20 and one end of the twenty-first resistor R21 respectively. The other end of the twentieth resistor R20 is electrically connected to one end of the sixth resistor R6, one end of the twenty-second resistor R22, the emitter of the second PNP transistor Q2, one end of the fourth capacitor C4, and pin 1 of the second programmable Hall element H2 respectively. The other end of the sixth resistor R6 is electrically connected to pin 1 of the second power supply reference chip D2 and one end of the twenty-third resistor R23 respectively. The other end of the twenty-second resistor R22 is electrically connected to pin 3 of the second power supply reference chip D2 and the base of the second PNP transistor Q2 respectively. The other end of the third capacitor C3 is electrically connected to the other end of the twenty-third resistor R23, pin 2 of the second power supply reference chip D2, the collector of the second PNP transistor Q2, and the other end of the fourth capacitor C4 respectively.

[0048] Through this circuit design, the performance of the product is improved. The Hall current sensor made by this circuit can achieve a detection performance with an accuracy of 0.2% and a temperature drift of 0.1 mV / °C.

[0049] Based on the description and drawings of the present invention, those skilled in the art can easily manufacture or use the high-precision and low-temperature-drift Hall current sensor circuit of the present invention and can produce the positive effects recorded in the present invention.

[0050] Unless otherwise clearly specified and defined, in the present invention, if there are terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms used to describe the orientation or positional relationship in the present invention are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood by combining the drawings and according to the specific circumstances.

[0051] Unless otherwise clearly specified and defined, in the present invention, if there are terms such as "set", "connected" and "connected", they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0052] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Any simple modification or equivalent change made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A high-precision low-temperature-drift Hall current sensor circuit, characterized in that: It includes a first power conversion module, a first programmable Hall H1, and a signal processing module. The first programmable Hall H1 is electrically connected to the first power conversion module and the signal processing module respectively; The signal processing module includes a first operational amplifier U1, a second operational amplifier U2, a third operational amplifier U3, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twenty-fourth resistor RA, a twenty-fifth resistor RB, and a twenty-sixth resistor RC; Pin 1 of the first operational amplifier U1 is electrically connected to one end of the seventh resistor R7 and one end of the ninth resistor R9 respectively. The other end of the seventh resistor R7 is electrically connected to pin 4 of the first programmable Hall H1. Pin 2 of the first operational amplifier U1 is electrically connected to one end of the eighth resistor R8 and the tenth resistor R10 respectively. The other end of the eighth resistor R8 is electrically connected to pin 3 of the first programmable Hall H1. The other end of the ninth resistor R9 is electrically connected to pin 3 of the first operational amplifier U1 and one end of the fifteenth resistor R15 respectively. The other end of the fifteenth resistor R15 is electrically connected to one end of the sixteenth resistor R16 and one end of the seventeenth resistor R17 respectively. The other end of the sixteenth resistor R16 is electrically connected to one end of the thirteenth resistor R13 and pin 3 of the second operational amplifier U2 respectively. The other end of the thirteenth resistor R13 is electrically connected to the eleventh resistor R11 and pin 1 of the second operational amplifier U2 respectively. Pin 2 of the second operational amplifier U2 is electrically connected to the twelfth resistor R12 and the fourteenth resistor R14 respectively. The other end of the seventeenth resistor R17 is electrically connected to pin 2 of the third operational amplifier U3. Pin 1 of the third operational amplifier U3 is electrically connected to one end of the eighteenth resistor R18 and one end of the nineteenth resistor R19 respectively. The other end of the eighteenth resistor R18 is electrically connected to the twenty-fourth resistor RA and the twenty-fifth resistor RB respectively. The other end of the nineteenth resistor R19 is electrically connected to one end of the twenty-sixth resistor RC. The other end of the twenty-sixth resistor RC is electrically connected to pin 3 of the third operational amplifier U3.

2. The high-precision low-temperature-drift Hall current sensor circuit according to claim 1, characterized in that: The first power conversion module includes a first power reference chip D1, a first PNP transistor Q1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, and a second capacitor C2; One end of the first capacitor C1 is electrically connected to one end of the fourth resistor R4 and one end of the fifth resistor R5 respectively, and the other end is electrically connected to one end of the first resistor R1, the 2nd pin of the first power reference chip D1, the collector of the first PNP transistor Q1, and one end of the second capacitor C2 respectively. The other end of the fourth resistor R4 is electrically connected to the other end of the fifth resistor R5, one end of the second resistor R2, one end of the third resistor R3, the emitter of the first PNP transistor Q1, the other end of the second capacitor C2, and the 1st pin of the first programmable Hall H1 respectively. The other end of the second resistor R2 is electrically connected to the 1st pin of the first power reference chip D1 and the other end of the first resistor R1 respectively. The 3rd pin of the first power reference chip D1 is electrically connected to the other end of the third resistor R3 and the base of the first PNP transistor Q1 respectively.

3. The high-precision low-temperature-drift Hall current sensor circuit according to claim 1, wherein: It includes a second power conversion module and a second programmable Hall H2. The second programmable Hall H2 is electrically connected to the second power conversion module and the signal processing module respectively.

4. The high-precision low-temperature-drift Hall current sensor circuit according to claim 3, characterized in that: The second power conversion module includes a second power reference chip D2, a second PNP transistor Q2, a sixth resistor R6, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a third capacitor C3, and a fourth capacitor C4. One end of the third capacitor C3 is electrically connected to one end of the twentieth resistor R20 and one end of the twenty-first resistor R21 respectively. The other end of the twentieth resistor R20 is electrically connected to one end of the sixth resistor R6, one end of the twenty-second resistor R22, the emitter of the second PNP transistor Q2, one end of the fourth capacitor C4, and the 1st pin of the second programmable Hall H2 respectively. The other end of the sixth resistor R6 is electrically connected to the 1st pin of the second power reference chip D2 and one end of the twenty-third resistor R23 respectively. The other end of the twenty-second resistor R22 is electrically connected to the 3rd pin of the second power reference chip D2 and the base of the second PNP transistor Q2 respectively. The other end of the third capacitor C3 is electrically connected to the other end of the twenty-third resistor R23, the 2nd pin of the second power reference chip D2, the collector of the second PNP transistor Q2, and the other end of the fourth capacitor C4 respectively.

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