Current detection device

Abstract

The utility model discloses a current detection device, which comprises a current generation unit suitable for being connected with a preset power supply, and the current generation unit is configured to generate excitation current according to the preset power supply; the power supply generation unit is suitable for being connected with a preset power supply, the power supply generation unit is configured to generate power supply voltage according to the preset power supply, and the power supply voltage is smaller than 0; the Hall sensor is connected with the current generation unit, and the Hall sensor is configured to detect the current signal to be detected based on the excitation current so as to obtain a first voltage signal; the power supply end of the signal processing unit is connected with the power supply generation unit and is suitable for being connected with a preset power supply, the input end of the signal processing unit is connected with the Hall sensor, and the signal processing unit is configured to amplify the first voltage signal to generate a second voltage signal. According to the device, detection is performed through a preset power supply, so that the complexity and the cost of the current detection device are reduced.

Description

Technical Field

[0001] This application relates to the field of detection technology, and in particular to a current detection device. Background Technology

[0002] In current measurement technology, shunt resistance method, Hall effect sensor, and current transformer are the most common, and these three technologies have different application scenarios. For high-precision applications, shunt resistance method and Hall effect sensor are commonly used choices, while for applications with high current and high isolation requirements, Hall effect sensor is more suitable. However, Hall sensor usually requires dual power supply, which increases the complexity and cost of the system. Utility Model Content

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to provide a current detection device that can achieve bipolar output current detection by being powered by a preset power supply, thereby reducing the complexity and cost of the current detection device.

[0004] To achieve the above objectives, a current detection device is proposed according to an embodiment of the present invention, comprising: a current generation unit adapted to be connected to a preset power supply, the current generation unit being configured to generate an excitation current based on the preset power supply; a power supply generation unit adapted to be connected to the preset power supply, the power supply generation unit being configured to generate a power supply voltage based on the preset power supply, wherein the power supply voltage is less than 0; a Hall sensor connected to the current generation unit, the Hall sensor being configured to detect a current signal to be measured based on the excitation current to obtain a first voltage signal; and a signal processing unit, the power supply terminal of the signal processing unit being connected to the power generation unit and adapted to be connected to the preset power supply, the input terminal of the signal processing unit being connected to the Hall sensor, the signal processing unit being configured to amplify the first voltage signal to generate a second voltage signal.

[0005] The current detection device according to an embodiment of the present invention includes a current generation unit, a power generation unit, a Hall sensor, and a signal processing unit. The current generation unit is adapted to be connected to a preset power supply and is configured to generate an excitation current based on the preset power supply. The power generation unit is adapted to be connected to the preset power supply and is configured to generate a power supply voltage based on the preset power supply, wherein the power supply voltage is less than 0. The Hall sensor is connected to the current generation unit and is configured to detect the current signal to be measured based on the excitation current to obtain a first voltage signal. The power supply terminal of the signal processing unit is connected to the power generation unit and is adapted to be connected to the preset power supply. The input terminal of the signal processing unit is connected to the Hall sensor, and the signal processing unit is configured to amplify the first voltage signal to generate a second voltage signal. Therefore, bipolar output of current detection can be achieved by powering with a single preset power supply, thereby reducing the complexity and cost of the current detection device.

[0006] According to one embodiment of the present invention, the signal processing unit includes: a first resistor, one end of which is connected to the positive output terminal of a Hall sensor; a second resistor, one end of which is connected to the negative output terminal of the Hall sensor; an operational amplifier, the positive input terminal of which is connected to the other end of the first resistor, the negative input terminal of which is connected to the other end of the second resistor, a first power supply terminal of which is adapted to be connected to a preset power supply, and a second power supply terminal of which is connected to a power generation unit; a gain adjustment module, which is connected to the operational amplifier and configured to adjust the gain of the operational amplifier; and a bias voltage adjustment module, which is connected to the operational amplifier and configured to adjust the bias voltage of the operational amplifier to adjust the zero-point voltage of the operational amplifier.

[0007] According to one embodiment of the present invention, the gain adjustment module includes: a third resistor, one end of which is connected to the first gain interface of the operational amplifier, and the other end of which is connected to the second gain interface of the operational amplifier; and an adjustable resistor, which is connected in parallel with the third resistor.

[0008] According to one embodiment of the present invention, the bias voltage adjustment module includes: a fourth resistor, one end of which is connected to the reference terminal of the operational amplifier; a first capacitor, one end of which is connected to one end of the fourth resistor, and the other end of which is grounded; and a potentiometer, the control terminal of which is connected to the other end of the fourth resistor, the first end of which is adapted to be connected to a power supply voltage, and the second end of which is adapted to be connected to a preset power supply.

[0009] According to one embodiment of the present invention, the power generation unit includes a voltage conversion module. The input terminal of the voltage conversion module is adapted to be connected to a preset power supply. The voltage conversion module is configured to perform voltage conversion on the preset power supply to generate a power supply voltage.

[0010] According to one embodiment of the present invention, the voltage conversion module includes a charge pump.

[0011] According to one embodiment of the present invention, the sum of the power supply voltage and the preset power supply is 0, and the second voltage signal is between the first voltage and the second voltage, wherein the first voltage is half of the power supply voltage and the second voltage is half of the preset power supply.

[0012] According to one embodiment of the present invention, the current generation unit includes: a switching transistor, the first end of which is connected to a Hall sensor; a fifth resistor, one end of which is connected to the control terminal of the switching transistor, and the other end of which is adapted to be connected to a preset power supply; a sixth resistor, one end of which is connected to the second terminal of the switching transistor, and the other end of which is grounded; and a voltage regulator, the cathode of which is connected to one end of the fifth resistor, the anode of which is grounded, and the reference terminal of which is connected to one end of the sixth resistor and the second terminal of the switching transistor, respectively.

[0013] According to one embodiment of the present invention, the excitation current is the ratio of the reference voltage of the voltage regulator to the sixth resistor.

[0014] According to one embodiment of the present invention, the Hall sensor is a gallium nitride Hall sensor.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a current detection device according to an embodiment of the present invention;

[0017] Figure 2 This is a circuit diagram of a signal processing unit according to an embodiment of the present invention;

[0018] Figure 3 This is a circuit diagram of a voltage conversion module according to an embodiment of the present invention;

[0019] Figure 4 This is a circuit diagram of a current generation unit according to an embodiment of the present invention. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0021] The current detection device of this utility model embodiment is described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the structure of a current detection device according to an embodiment of the present invention. Figure 1 As shown, the current detection device includes: a current generation unit 10, a power generation unit 20, a Hall sensor 30, and a signal processing unit 40.

[0023] The current generation unit 10 is adapted to be connected to a preset power supply VDD and is configured to generate an excitation current based on the preset power supply VDD. The power generation unit 20 is adapted to be connected to the preset power supply VDD and is configured to generate a power supply voltage based on the preset power supply VDD, wherein the power supply voltage is less than 0. The Hall sensor 30 is connected to the current generation unit 10 and is configured to detect the current signal to be measured based on the excitation current to obtain a first voltage signal. The power supply terminal of the signal processing unit 40 is connected to the power generation unit 20 and is adapted to be connected to the preset power supply VDD. The input terminal of the signal processing unit 40 is connected to the Hall sensor 30 and is configured to amplify the first voltage signal to generate a second voltage signal.

[0024] Specifically, the Hall sensor 30 detects the current signal to be measured and converts it into a first voltage signal proportional to the current. Because the first voltage signal is relatively small, it needs to be amplified by the signal processing unit 40 to generate a second voltage signal. The current generation unit 10 generates an excitation current for the Hall sensor 30 based on a preset power supply VDD, thereby providing a stable excitation current for the Hall sensor 30. The power supply generation unit 20 generates a negative power supply voltage based on the preset power supply VDD and provides the power supply voltage to the signal processing unit 40, thereby enabling the signal processing unit 40 to achieve bipolar voltage output, that is, the second voltage signal can be a positive voltage, 0, or a negative voltage. The bipolar voltage can be used to characterize positive and negative currents. Therefore, the current detection device in this embodiment can achieve current detection and bipolar voltage output by being powered by a preset power supply VDD.

[0025] In one alternative implementation, the output of the signal processing unit 40 is adapted to connect to an analog-to-digital converter or data acquisition device of an external device so that the host computer or data acquisition device can perform current monitoring and analysis.

[0026] In the above embodiments, the current detection device of this embodiment can realize current detection by being powered by a preset power supply, and the signal processing unit is also connected to the positive preset power supply and the negative power supply voltage. Therefore, the signal processing unit can realize bipolar voltage output, thereby reducing the complexity and cost of the current detection device.

[0027] In some embodiments, the sum of the power supply voltage and the preset power supply VDD is 0, and the second voltage signal is between the first voltage and the second voltage, wherein the first voltage is half of the power supply voltage and the second voltage is half of the preset power supply VDD.

[0028] Specifically, the power supply voltage is a negative voltage symmetrical to the preset power supply VDD. Because the power supply voltage is symmetrical to the preset power supply VDD, the bipolar voltage output by the signal processing unit 40 is also symmetrical, namely, the first voltage to 0V and the 0V to the second voltage. For example, if the preset power supply VDD is 5V, then the power supply voltage is -5V, and the bipolar voltage output by the signal processing unit 40 is -2.5V to 0V and the 0V to 2.5V.

[0029] In the above embodiments, by providing symmetrical positive and negative voltages to the signal processing unit, the signal processing unit can achieve symmetrical bipolar voltage output.

[0030] In some embodiments, the Hall sensor 30 is a gallium nitride Hall sensor 30.

[0031] Understandably, gallium nitride (GaN) Hall sensors offer higher accuracy and more stable current detection because of the high electron mobility, low noise, and low temperature drift of GaN materials.

[0032] In some embodiments, such as Figure 2As shown, the signal processing unit 40 includes: a first resistor R1, a second resistor R2, an operational amplifier 41, a gain adjustment module 42, and a bias voltage adjustment module 43. One end of the first resistor R1 is connected to the positive output terminal of the Hall sensor 30; one end of the second resistor R2 is connected to the negative output terminal of the Hall sensor 30; the positive input terminal +IN of the operational amplifier 41 is connected to the other end of the first resistor R1, and the negative input terminal -IN of the operational amplifier 41 is connected to the other end of the second resistor R2. The first power supply terminal +VS of the operational amplifier 41 is adapted to be connected to a preset power supply VDD, and the second power supply terminal -VS of the operational amplifier 41 is connected to the power generation unit 20. The gain adjustment module 42 is connected to the operational amplifier 41 and is configured to adjust the gain of the operational amplifier 41. The bias voltage adjustment module 43 is connected to the operational amplifier 41 and is configured to adjust the bias voltage of the operational amplifier 41 to adjust the zero-point voltage of the operational amplifier 41.

[0033] Specifically, the first resistor R1 and the second resistor R2 are used to limit the electrical signal output by the Hall sensor 30 to protect the input stage of the operational amplifier 41 from excessive current surges. Furthermore, by precisely matching the first resistor R1 and the second resistor R2, the common-mode rejection ratio of the operational amplifier 41 can be maximized, thereby suppressing environmental electromagnetic interference. The signal processing unit 40 employs a differential amplification structure. The operational amplifier 41 amplifies the voltage difference between the positive input terminal +IN and the negative input terminal -IN, while suppressing common-mode voltage. The gain adjustment module 42 can set the amplification factor of the operational amplifier 41, ensuring that the second voltage signal meets the output voltage range. Additionally, the bias voltage adjustment module 43 adjusts the bias voltage of the operational amplifier 41, enabling adjustment of the zero-point output voltage according to actual conditions.

[0034] Optionally, the signal processing unit 40 further includes a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a seventh resistor R7, and an eighth capacitor C8. One end of the third capacitor C3 is connected to the other end of the first resistor R1, and the other end of the third capacitor C3 is grounded. One end of the fourth capacitor C4 is connected to the other end of the third capacitor C3. One end of the fifth capacitor C5 is connected to the other ends of both the second resistor R2 and the fourth capacitor C4, and the other end of the fifth capacitor C5 is grounded. One end of the sixth capacitor C6 is connected to the first power supply terminal +VS of the operational amplifier 41, and the other end of the sixth capacitor C6 is grounded. One end of the seventh capacitor C7 is connected to the second power supply terminal -VS of the operational amplifier 41, and the other end of the seventh capacitor C7 is grounded. One end of the seventh resistor R7 is connected to the output terminal OUT of the operational amplifier 41, and the other end of the seventh resistor R7 is the output terminal of the signal processing unit 40. One end of the eighth capacitor C8 is connected to the other end of the seventh resistor R7, and the other end of the eighth capacitor C8 is grounded. The third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5 are used to filter the first voltage signal output by the Hall sensor 30. The sixth capacitor C6 is used to filter the preset power supply VDD. The seventh capacitor C7 is used to filter the power supply voltage VEE. The seventh resistor R7 and the eighth capacitor C8 are used to filter the second voltage signal.

[0035] In some embodiments, such as Figure 2 As shown, the gain adjustment module 42 includes a third resistor R3 and an adjustable resistor R. One end of the third resistor R3 is connected to the first gain interface RG of the operational amplifier 41, and the other end of the third resistor R3 is connected to the second gain interface RG / 2 of the operational amplifier 41. The adjustable resistor R is connected in parallel with the third resistor R3.

[0036] In other words, by adjusting the resistance value of the adjustable resistor R, the resistance value of the gain adjustment module 42 can be adjusted, thereby setting the amplification factor of the operational amplifier 41.

[0037] In some embodiments, such as Figure 2 As shown, the bias voltage adjustment module 43 includes: a fourth resistor R4, a first capacitor C1, and a potentiometer RP. One end of the fourth resistor R4 is connected to the reference terminal of the operational amplifier 41; one end of the first capacitor C1 is connected to one end of the fourth resistor R4, and the other end of the first capacitor C1 is grounded; the control terminal of the potentiometer RP is connected to the other end of the fourth resistor R4; the first terminal of the potentiometer RP is adapted to be connected to the power supply voltage VEE, and the second terminal of the potentiometer RP is adapted to be connected to the preset power supply VDD.

[0038] Specifically, adjusting the control terminal of potentiometer RP controls its resistance value. Since the two ends of potentiometer RP are connected to the preset power supply VDD and the power supply voltage VEE respectively, adjusting the control terminal of potentiometer RP adjusts the voltage division of potentiometer RP, thereby adjusting the bias voltage. The fourth resistor R4 and the first capacitor C1 are used to filter the bias voltage output by potentiometer RP, thus obtaining a more accurate bias voltage.

[0039] In the above embodiments, the signal processing unit supports gain adjustment and bias voltage adjustment. Users can adjust the gain and bias voltage according to the application scenario to ensure the linear output of the current detection device in different current measurement ranges. This not only increases the applicable scenarios of the current detection device, but also ensures that the measurement accuracy of the current detection device reaches within 0.5‰ through multi-point calibration.

[0040] In some embodiments, the power generation unit 20 includes a voltage conversion module, the input of which is adapted to be connected to a preset power supply VDD, and the voltage conversion module is configured to perform voltage conversion on the preset power supply VDD to generate a power supply voltage VEE.

[0041] In other words, the voltage conversion module performs voltage conversion on the preset power supply VDD to generate a negative power supply voltage VEE. Therefore, the current detection device does not need to be powered by a dual power supply, which simplifies the circuit of the current detection device.

[0042] Optionally, in some embodiments, such as Figure 3 As shown, the voltage conversion module 21 includes a charge pump 211.

[0043] by Figure 3 As shown in the example, the voltage conversion module 21 also includes a ninth capacitor C9 and a tenth capacitor C10. One end of the ninth capacitor C9 is connected to the positive capacitor pin CAP+ of the charge pump 211, and the other end of the ninth capacitor C9 is connected to the negative capacitor pin CAP- of the charge pump 211. One end of the tenth capacitor C10 is connected to the voltage input pin V+ of the charge pump 211, and the other end of the tenth capacitor C10 is grounded. The output terminal OUT of the charge pump 211 is adapted to output the power supply voltage VEE.

[0044] It should be noted that the voltage conversion module 21 is not limited to a voltage conversion circuit composed of charge pump 211, but can also be other voltage conversion circuits, which are not limited here.

[0045] In some embodiments, such as Figure 4As shown, the current generation unit 10 includes: a switch Q, a fifth resistor R5, a sixth resistor R6, and a voltage regulator 11. The first end of the switch Q is connected to the Hall sensor 30; one end of the fifth resistor R5 is connected to the control terminal of the switch Q, and the other end of the fifth resistor R5 is adapted to be connected to a preset power supply VDD; one end of the sixth resistor R6 is connected to the second end of the switch Q, and the other end of the sixth resistor R6 is grounded; the cathode of the voltage regulator 11 is connected to one end of the fifth resistor R5, the anode of the voltage regulator 11 is grounded, and the reference terminal of the voltage regulator 11 is connected to one end of the sixth resistor R6 and the second end of the switch Q.

[0046] Specifically, the current generation unit 10 achieves constant current output by maintaining a constant voltage between the reference terminal and the anode of the voltage regulator 11. When the output current increases, the voltage across the sixth resistor R6 increases. When the voltage across the sixth resistor R6 exceeds the reference voltage of the voltage regulator 11, the voltage regulator 11 turns on, the voltage drop across the fifth resistor R5 increases, and the cathode voltage of the voltage regulator 11 decreases. Therefore, the voltage at the control terminal of the switch Q decreases, the conduction capability of the switch Q decreases, resulting in a decrease in the output current and forming negative feedback.

[0047] Optionally, the switching transistor Q is an N-type transistor.

[0048] In some embodiments, the excitation current is the ratio of the reference voltage of the regulated source 11 to the sixth resistor R6.

[0049] Specifically, the formula for calculating the excitation current is as follows:

[0050] Iout = Vref / R6

[0051] Where Iout is the excitation current and Vref is the reference voltage.

[0052] Taking the regulated power supply 11 using the TL431 device as an example, the reference voltage of the TL431 device is 2.5V. Therefore, by substituting the reference voltage Vref into 2.5V and selecting a suitable sixth resistor R6, the output current can be 3.5mA.

[0053] In the above embodiments, the current generation unit achieves constant current output through a voltage regulator, so that the excitation current remains constant even when the Hall sensor is under different operating conditions, thereby improving the stability of the current detection device.

[0054] In summary, the current detection device according to this embodiment includes a current generation unit, a power generation unit, a Hall sensor, and a signal processing unit. The current generation unit is adapted to be connected to a preset power supply and is configured to generate an excitation current based on the preset power supply. The power generation unit is adapted to be connected to the preset power supply and is configured to generate a power supply voltage based on the preset power supply, wherein the power supply voltage is less than 0. The Hall sensor is connected to the current generation unit and is configured to detect the current signal to be measured based on the excitation current to obtain a first voltage signal. The power supply terminal of the signal processing unit is connected to the power generation unit and is adapted to be connected to the preset power supply. The input terminal of the signal processing unit is connected to the Hall sensor, and the signal processing unit is configured to amplify the first voltage signal to generate a second voltage signal. Therefore, bipolar output of current detection can be achieved by powering with a single preset power supply, thereby reducing the complexity and cost of the current detection device. Furthermore, gallium nitride Hall current sensors are ideal for high-precision current measurement due to their high electron mobility and low temperature drift. Combined with the high common-mode rejection ratio and low noise characteristics of the signal processing unit, as well as the application of constant current sources and charge pumps, a high-precision, bipolar output current measurement system can be realized.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Furthermore, the terms "first," "second," etc., used in the embodiments of this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this utility model can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this utility model, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0057] In this utility model, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific implementation.

[0058] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A current detection device, characterized by, The application relates to a current signal detection device, which comprises the following parts: a current generation unit adapted to connect a preset power supply, the current generation unit being configured to generate an excitation current according to the preset power supply; a power generation unit adapted to connect the preset power supply, the power generation unit being configured to generate a power voltage according to the preset power supply, wherein the power voltage is less than 0; a Hall sensor connected with the current generation unit, the Hall sensor being configured to detect a to-be-detected current signal based on the excitation current to obtain a first voltage signal; a signal processing unit, a power supply end of the signal processing unit being connected with the power generation unit and adapted to connect the preset power supply, an input end of the signal processing unit being connected with the Hall sensor, the signal processing unit being configured to amplify the first voltage signal to generate a second voltage signal.

2. The current detection device according to claim 1, wherein The signal processing unit comprises: a first resistor, one end of the first resistor being connected with a positive output end of the Hall sensor; a second resistor, one end of the second resistor being connected with a negative output end of the Hall sensor; an operational amplifier, a positive input end of the operational amplifier being connected with the other end of the first resistor, a negative input end of the operational amplifier being connected with the other end of the second resistor, a first power supply end of the operational amplifier being adapted to connect the preset power supply, a second power supply end of the operational amplifier being connected with the power generation unit; a gain adjustment module connected with the operational amplifier, the gain adjustment module being configured to adjust the gain of the operational amplifier; a bias voltage adjustment module connected with the operational amplifier, the bias voltage adjustment module being configured to adjust the bias voltage of the operational amplifier to adjust the zero voltage of the operational amplifier.

3. The current detection device according to claim 2, wherein The gain adjustment module comprises: a third resistor, one end of the third resistor being connected with a first gain interface of the operational amplifier, the other end of the third resistor being connected with a second gain interface of the operational amplifier; an adjustable resistor connected with the third resistor in parallel.

4. The current detection device according to claim 2, wherein The bias voltage adjustment module comprises: a fourth resistor, one end of the fourth resistor being connected with a reference end of the operational amplifier; a first capacitor, one end of the first capacitor being connected with one end of the fourth resistor, the other end of the first capacitor being grounded; a potentiometer, a control end of the potentiometer being connected with the other end of the fourth resistor, a first end of the potentiometer being adapted to connect the power voltage, a second end of the potentiometer being adapted to connect the preset power supply.

5. The current detection device according to claim 1, wherein The power generation unit comprises a voltage conversion module, an input end of the voltage conversion module being adapted to connect the preset power supply, the voltage conversion module being configured to convert the voltage of the preset power supply to generate the power voltage.

6. The current detection device according to claim 5, wherein The voltage conversion module comprises a charge pump.

7. The current detection device according to claim 1, wherein The sum of the power voltage and the preset power source is 0, and the second voltage signal is between a first voltage and a second voltage, wherein the first voltage is half of the power voltage, and the second voltage is half of the preset power source.

8. The current sensing device according to any one of claims 1 to 7, characterized in that, The current generating unit comprises: a switch tube, a first end of the switch tube being connected with the Hall sensor; a fifth resistor, one end of the fifth resistor being connected with a control end of the switch tube, and the other end of the fifth resistor being adapted to be connected with the preset power source; a sixth resistor, one end of the sixth resistor being connected with a second end of the switch tube, and the other end of the sixth resistor being grounded; a voltage stabilizer, a cathode of the voltage stabilizer being connected with one end of the fifth resistor, an anode of the voltage stabilizer being grounded, and a reference end of the voltage stabilizer being connected with one end of the sixth resistor and the second end of the switch tube respectively.

9. The current detection device according to claim 8, wherein The excitation current is a ratio of a reference voltage of the voltage stabilizer to the sixth resistor.

10. The current sensing device according to any one of claims 1 to 7, wherein, The Hall sensor is a gallium nitride Hall sensor.

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