Current sensor, current detection method and chip

Abstract

The invention discloses a current sensor, a current detection method and a chip. The current sensor comprises a diversion module, a magnetic sensing module, an application-specific integrated circuit module and a magnetic field compensation module, the diversion module is configured to introduce and export a detection current, and the application-specific integrated circuit module is configured to drive the magnetic field compensation module to drive an electric signal to operate according to the detection current; the application-specific integrated circuit module is further configured to output a driving electric signal under the condition that the first magnetic field component of the diversion module and the second magnetic field component of the magnetic field compensation module reach a balance state at the magnetic sensing module. According to the current sensor, the magnetic sensing module is adopted to sense the magnetic field generated by the detection current, the circuit signal output by the magnetic sensing module based on the change of the magnetic field is processed through the application-specific integrated circuit, and the magnetic field compensation module is controlled according to the processing result to form the balanced magnetic field so as to realize the closed-loop detection of the detection current. Therefore, the accuracy of current detection is improved, and the null drift phenomenon of the current sensor is improved.

Description

Technical Field

[0001] The present application relates to the field of integrated circuit technology, and in particular to a current sensor, a current detection method and a chip. Background Art

[0002] A current sensor is a device used to measure current and is widely used in power systems, industrial automation, automotive electronics, and electronic equipment. With the growth of electricity demand and the popularity of electronic equipment, the demand for current sensors is also growing rapidly. At the same time, the trend of system miniaturization and precision has also created a huge demand for high-precision current sensor integrated chips. However, the integrated current sensor chips in the current related technologies mainly use open-loop detection methods, which have a simple structure and are easy to implement, but have low measurement accuracy, a large degree of zero drift, and are inevitably affected by external magnetic field interference and temperature changes, and have poor detection stability. Summary of the invention

[0003] The present application provides a current sensor, a current detection method and a chip.

[0004] The current sensor involved in the embodiment of the present application includes a current guide module, a magnetic sensitive module, a dedicated integrated circuit module and a magnetic field compensation module.

[0005] The current guiding module is configured to introduce and export the detection current.

[0006] The ASIC module is configured to drive the magnetic field compensation module to operate with a driving electrical signal according to the detection current, wherein the driving electrical signal includes a driving current;

[0007] The dedicated integrated circuit module is also configured to determine and output the output signal of the current sensor when the first magnetic field component of the diversion module and the second magnetic field component in the magnetic field compensation module reach a state of equilibrium at the magnetic sensitive module, wherein the first magnetic field component is the component of the magnetic field generated by the detection current at the magnetic sensitive module, and the second magnetic field component is the component of the magnetic field generated by the driving current at the magnetic sensitive module.

[0008] In some embodiments, the flow diversion module and the magnetic field compensation module are placed on the same reference plane, and the magnetic sensitive module is arranged between the flow diversion module and the magnetic field compensation module.

[0009] In some embodiments, the dedicated integrated circuit module includes a signal conditioning subcircuit, which is connected to the signal output port of the magnetic sensitive module. The signal conditioning subcircuit is configured to determine the driving electrical signal based on the detection electrical signal processing, and to determine the output signal of the current sensor when the first magnetic field component and the second magnetic field component reach a equilibrium state, wherein the detection electrical signal is the output signal of the magnetic sensitive module.

[0010] In some embodiments, the ASIC module further includes a feedback subcircuit, which is connected to the magnetic field compensation module and is configured to drive the magnetic field compensation module to operate according to the driving electrical signal.

[0011] In some embodiments, the ASIC module is further configured to supply power to the magnetic sensing module, and a power receiving port of the magnetic sensing module is connected to a power supply port of the ASIC module.

[0012] In some embodiments, the magnetic sensitive module includes a target bridge, and a magnetic sensitive resistor is arranged on each bridge arm of the target bridge. The magnetic field sensitive directions of the magnetic sensitive resistors arranged on the directly connected bridge arms form a preset angle, and the magnetic field sensitive directions of the magnetic sensitive resistors arranged on the bridge arms that are not directly connected are the same.

[0013] In some embodiments, the signal output port of the target bridge is connected to the signal conditioning subcircuit in the ASIC module, and the power receiving port of the target bridge is connected to the power supply port of the ASIC module.

[0014] In some embodiments, the magnetoresistor includes at least one of a Hall element, an anisotropic magnetoresistive element, a giant magnetoresistive element, or a tunnel magnetoresistive element.

[0015] In some embodiments, the magnetic field compensation module includes one or more conductors arranged in parallel with the flow guidance module.

[0016] In some embodiments, the material of the conductor includes at least one of copper or aluminum, and the thickness of the conductor is 0.5 mm to 5 mm.

[0017] In some embodiments, the current sensor also includes a power port, a ground port, and a signal output port, the power port is connected to an external power supply, the ground port is grounded, and the signal output port is connected to the dedicated integrated circuit module to output the output signal of the current sensor.

[0018] The current detection method in the embodiment of the present application is used for the above-mentioned current sensor, and the method includes:

[0019] The ASIC module controls the magnetic field compensation module to operate with a driving electrical signal according to the detection current introduced by the current diversion module, wherein the driving electrical signal includes a driving current;

[0020] When the first magnetic field component of the current guidance module and the second magnetic field component of the magnetic field compensation module reach a balanced state at the magnetic sensing module, the ASIC module determines and outputs an output signal of the current sensor.

[0021] The chip in the embodiment of the present application includes the above-mentioned current sensor.

[0022] The current sensor in the present application uses a magnetic sensing module to sense the magnetic field generated by the detection current, processes the circuit signal output by the magnetic sensing module based on the sensed magnetic field through a dedicated integrated circuit, and further controls the magnetic field compensation module to form a reverse balanced magnetic field according to the processing result to realize closed-loop detection of the detection current, thereby improving the accuracy of current detection and improving the potential zero drift phenomenon of the current sensor.

[0023] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0025] Figure 1 A schematic diagram of the relative position relationship of the components of the current sensor in the embodiment of the present application;

[0026] Figure 2 This is a schematic diagram of the connection relationship between the dedicated integrated circuit module, the magnetic sensing module and the magnetic field compensation module in the implementation manner of the present application;

[0027] Figure 3 This is a schematic diagram of the connection relationship between the ASIC circuit, the target bridge, and the magnetic field compensation module in the implementation manner of the present application;

[0028] Figure 4 A schematic diagram of the direction of the magnetic field generated by the detection current and the driving current in the implementation manner of the present application;

[0029] Figure 5 This is a schematic diagram of the appearance of a current sensor in an embodiment of the present application;

[0030] Figure 6 Schematic diagram of the relative position relationship of various components of the current sensor in the implementation manner of the present application.

[0031] Among them: 101, magnetic field compensation module; 102, magnetic sensitive module; 1020, target bridge; 103, dedicated integrated circuit module; 1031, signal conditioning subcircuit; 1032, feedback subcircuit; 104, diversion module; 1041, diversion unit; 1042, magnetic field generating unit; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; 105, power port; 106, ground port; 107, signal output port; 108, signal output port. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and cannot be understood as limiting the embodiments of the present application.

[0033] See also Figure 1 The current sensor 10 in the embodiment of the present application includes a current guiding module 104, a magnetic sensing module 102, a dedicated integrated circuit module 103 and a magnetic field compensation module 101. The current guiding module 104 is configured to introduce and export the detection current.

[0034] The ASIC module 103 is configured to drive the magnetic field compensation module 101 to operate with a driving electrical signal according to the detection current, wherein the driving electrical signal includes a driving current;

[0035] The dedicated integrated circuit module 103 is also configured to output a driving electrical signal when the first magnetic field component of the diversion module 104 and the second magnetic field component in the magnetic field compensation module 101 reach a state of equilibrium at the magnetic sensitive module 102, wherein the first magnetic field component is the component of the magnetic field generated by the detection current at the magnetic sensitive module 102, and the second magnetic field component is the component of the magnetic field generated by the driving current at the magnetic sensitive module 102.

[0036] Furthermore, the flow diversion module 104 and the magnetic field compensation module 101 are placed on the same reference plane, and the magnetic sensitive module 102 is disposed between the flow diversion module 104 and the magnetic field compensation module 101 .

[0037] Specifically, see Figure 1 , Figure 1The figure shows the components of the current sensor 10 and their relative positional relationship. The flow guide module 104 is generally configured as a U-shape as shown in the figure, and is provided with a flow guide portion 1041 and a magnetic field generating portion 1042. The flow guide portion 1041 is used to introduce and guide the detection current from the external circuit. When the detection current flows through the magnetic field generating portion 1042, the magnetic field generated can cover the magnetic sensitive module 102. It should be noted that Figure 1 The detection current direction shown in FIG. is only a schematic representation. The specific detection current direction can be as follows: Figure 1 As shown, it can also be Figure 1 The reverse of the situation shown can be adjusted according to actual conditions.

[0038] According to common sense, based on Ampere's law, in order to balance the magnetic field generated by the detection current in the diversion module 104 and the magnetic field generated by the current in the magnetic field compensation module 101 when the magnetic field compensation module 101 is running at the magnetic sensitive module 102, the magnetic sensitive module 102 should be positioned between the diversion module 104 and the magnetic field compensation module 101, so that the magnetic field generated by the current in the diversion module 104 and the magnetic field generated by the current in the magnetic field compensation module 101 at the magnetic sensitive module 102 can be in opposite directions, and the magnetic induction intensity of the magnetic field can be changed by adjusting the current, and finally the balance of the two sets of magnetic fields at the magnetic sensitive module 102 is achieved.

[0039] In addition, for the convenience of circuit connection, the magnetic sensing module 102 and the ASIC module 103 can be integrated on the same package substrate 105. Based on the above example, the package substrate 105 integrated with the magnetic sensing module 102 and the ASIC module 103 can be set between the diversion module 104 and the magnetic field compensation module 101. The ASIC module 103 supplies power to the magnetic sensing module 102 on the one hand, receives the detection electrical signal fed back to the ASIC module 103 by the magnetic sensing module 102 during operation, and determines the driving electrical signal for driving the magnetic field compensation module 101 based on the detection electrical signal, and further drives the magnetic field compensation module 101 to operate according to the driving electrical signal, so that the magnetic field generated by the current in the diversion module 104 and the magnetic field generated by the current in the magnetic field compensation module 101 reach a balanced state at the magnetic sensing module 102. When the above-mentioned equilibrium state is reached, the dedicated integrated circuit module 103 outputs the above-mentioned driving electrical signal as the output signal of the current sensor 10 to the external circuit, thereby realizing closed-loop detection of the current sensor, wherein the above-mentioned driving electrical signal can be in the form of different types of signals such as current and voltage, which can be adjusted according to actual conditions.

[0040] When the above-mentioned current sensor 10 is working, the detection current flows into the power sensor through the drainage part 1041 of the diversion module 104, and the corresponding detection magnetic field will be generated in the magnetic field generating part 1042. At the same time, the dedicated integrated circuit module 103 supplies power to the magnetic sensitive module 102, and the magnetic sensitive module 102 detects the above-mentioned detection magnetic field and generates a detection electrical signal, which is then fed back to the dedicated integrated circuit module 103. The dedicated integrated circuit module 103 determines the driving electrical signal for driving the magnetic field compensation module 101 to operate according to the above-mentioned circuit signal, and further supplies power to the magnetic field compensation module 101 based on the driving electrical signal, so that the magnetic field compensation module 101 operates according to the above-mentioned driving electrical signal. Furthermore, when the magnetic field compensation module 101 operates according to the driving electrical signal, the current therein is the driving current, and the driving current will also generate a corresponding driving magnetic field in the magnetic field compensation module 101. When the component of the above-mentioned detection magnetic field at the magnetic sensitive module 102 (corresponding to the first magnetic field component) and the component of the above-mentioned driving magnetic field at the magnetic sensitive module 102 (corresponding to the second magnetic field component) reach a balance state (that is, equal in magnitude and opposite in direction), the dedicated integrated circuit module 103 outputs the processed driving electrical signal as an output signal to the outside, completing the entire closed-loop detection process.

[0041] It should be added that, for the convenience of packaging and use, the above-mentioned flow diversion module 104, magnetic sensitive module 102, dedicated integrated circuit module 103 and magnetic field compensation module 101 can be integrated on the same chip as a complete functional circuit, or can be adapted to different integrated circuit structures for decentralized configuration to achieve the above-mentioned closed-loop detection purpose. The specific configuration method can be adjusted according to actual conditions, and this application does not make any specific limitations.

[0042] In this way, the current sensor 10 in the present application uses the magnetic sensing module 102 to sense the magnetic field generated by the detection current, processes the circuit signal output by the magnetic sensing module 102 based on the sensed magnetic field through the dedicated integrated circuit module 103, and further controls the magnetic field compensation module 101 to form a reverse balanced magnetic field according to the processing result to realize closed-loop detection of the detection current, thereby improving the accuracy of current detection and improving the potential zero drift phenomenon of the current sensor 10.

[0043] In certain embodiments, see Figure 2 The dedicated integrated circuit module 103 includes a signal conditioning subcircuit 1031, which is connected to the signal output port of the magnetic sensitive module 102. The signal conditioning subcircuit 1031 is configured to determine the driving electrical signal according to the detection electrical signal processing, and determine the output signal of the current sensor 10 when the first magnetic field component and the second magnetic field component reach a balanced state, wherein the detection electrical signal is the output signal of the magnetic sensitive module 102.

[0044] In some embodiments, the ASIC module 103 further includes a feedback subcircuit 1032 , which is connected to the magnetic field compensation module 101 , and is configured to drive the magnetic field compensation module 101 to operate according to the driving electrical signal.

[0045] In some embodiments, the ASIC module 103 is further configured to supply power to the magnetic sensing module 102 , and a power receiving port of the magnetic sensing module 102 is connected to a power supply port of the ASIC module 103 .

[0046] Specifically, the ASIC module 103 is generally a complete application-specific integrated circuit (hereinafter referred to as ASIC circuit, Application-Specific Integrated Circuit), wherein the ASIC circuit includes at least two functional subcircuits, namely, a signal conditioning subcircuit 1031 and a feedback subcircuit 1032, as well as functional ports such as a power supply port and an output port.

[0047] In the above case, the power supply port of the ASIC circuit is connected to the power receiving port of the magnetic sensitive module 102, that is, the ASIC circuit supplies power to the magnetic sensitive module 102 through the connection relationship between its own power supply port and the power receiving port of the magnetic sensitive module 102, so as to ensure the normal operation of the magnetic sensitive module 102. In addition, the ASIC circuit is also provided with a dual-channel output port, which can be connected to an external circuit. When the magnetic field generated by the current in the flow diversion module 104 and the magnetic field generated by the current in the magnetic field compensation module 101 reach a balanced state at the magnetic sensitive module 102, the ASIC circuit determines the above-mentioned driving electrical signal as the output signal of the current sensor 10, and outputs the above-mentioned output signal to the external circuit through the above-mentioned output port. The above-mentioned preset circuit processing

[0048] The signal conditioning subcircuit 1031 in the ASIC circuit is connected to the signal output port of the magnetic sensitive module 102 to form a complete working loop. Generally speaking, the magnetic sensitive module 102 includes more than one signal output port. For example, the magnetic sensitive module 102 has two signal output ports, and the above-mentioned signal conditioning subcircuit 1031 is connected to the above-mentioned two signal output ports through two corresponding ports. The signal conditioning subcircuit 1031 is responsible for receiving the detection electrical signal fed back by the magnetic sensitive module 102 based on the magnetic field environment generated by the current around it, and further determining the driving electrical signal for driving the magnetic field compensation module 101 to operate based on the above-mentioned detection electrical signal. The process of determining the above-mentioned driving electrical signal according to the above-mentioned detection electrical signal generally includes electrical signal processing such as filtering and amplification. When the magnetic field compensation module 101 works according to the above-mentioned driving electrical signal, it can generate a component of the driving magnetic field at the magnetic sensitive module 102, and the magnetic field component generated at the magnetic sensitive module 102 by the detection magnetic field corresponding to the detection current can reach a balanced state of equal magnitude and opposite direction. Then, in the above-mentioned equilibrium state, the ASIC circuit determines the above-mentioned driving electrical signal as the output signal of the current ASIC circuit, that is, the output signal of the current sensor 10. At this time, the ASIC circuit outputs the above-mentioned output signal to the external circuit through the output port, thereby completing the closed-loop detection process for the above-mentioned detection current.

[0049] The feedback subcircuit 1032 in the ASIC circuit is connected to the magnetic field compensation module 101 to form a complete working loop. At the same time, there is an electrical connection relationship between the feedback subcircuit 1032 and the signal conditioning subcircuit 1031. When the signal conditioning subcircuit 1031 determines the above-mentioned driving electrical signal, the feedback subcircuit 1032 obtains the above-mentioned driving electrical signal through the electrical connection relationship between the two, and supplies power to the magnetic field compensation module 101 based on the above-mentioned driving electrical signal, so that the magnetic field compensation module 101 works according to the above-mentioned driving electrical signal, wherein the driving electrical signal includes a driving current. When the magnetic field compensation module 101 works under the above-mentioned driving current conditions, it will generate a corresponding driving magnetic field around it based on the driving current, and achieve a balanced state by the component of the driving magnetic field at the magnetic sensitive module 102 (corresponding to the second magnetic field component) and the component of the above-mentioned detection magnetic field at the magnetic sensitive module 102 (corresponding to the first magnetic field component), so as to realize the closed-loop detection process of the current sensor 10 for the detection current.

[0050] See also Figure 3 In some embodiments, the magnetic sensitive module 102 includes a target bridge 1020, and a magnetic sensitive resistor is arranged on each bridge arm of the target bridge 1020. The magnetic field sensitive directions of the magnetic sensitive resistors arranged on the directly connected bridge arms form a preset angle, and the magnetic field sensitive directions of the magnetic sensitive resistors arranged on the bridge arms that are not directly connected are the same.

[0051] In some implementations, the signal output port of the target bridge 1020 is connected to the signal conditioning subcircuit 1031 in the ASIC module 103 , and the power receiving port of the target bridge 1020 is connected to the power supply port of the ASIC module 103 .

[0052] In some embodiments, the magnetoresistor includes at least one of a Hall element, an anisotropic magnetoresistive element, a giant magnetoresistive element, or a tunnel magnetoresistive element.

[0053] Specifically, see Figure 3 , the part in the oval dotted box is the target bridge 1020, the target bridge 1020 includes four bridge arms, each bridge arm is respectively provided with a magnetoresistor, illustratively, each bridge arm is respectively provided with a magnetoresistor, which are the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4, the bridge arm where R1 is located is the first bridge arm, the bridge arm where R2 is located is the second bridge arm, the bridge arm where R3 is located is the third bridge arm, and the bridge arm where R4 is located is the fourth bridge arm. The first bridge arm and the second bridge arm are connected to port B, the second bridge arm and the fourth bridge arm are connected to port C, the fourth bridge arm and the third bridge arm are connected to port D, and the third bridge arm and the first bridge arm are connected to port A.

[0054] The four magnetic sensitive resistors R1 to R4 in the above-mentioned magnetic sensitive resistors have the same parameters and specifications except for the magnetic field sensitive direction. The magnetic field sensitive directions of R1 and R4 are the same, and the magnetic field sensitive directions of R2 and R3 are also the same, that is, for the same magnetic field change, the resistance value changes of R1 and R4 are the same, and the resistance value changes of R2 and R3 are also the same. Furthermore, there is a preset angle between the magnetic field sensitive directions of R1 and R2, which is generally in the range of 30° to 180°. The specific angle value can be adjusted according to actual conditions, and this application does not make specific restrictions, that is, for the same magnetic field change, the resistance value changes of R1 and R2 are different.

[0055] Port A and port C of the target bridge 1020 are signal output ports, which are connected to the signal conditioning subcircuit 1031 in the ASIC circuit. The target bridge 1020 sends the detection electrical signal generated according to the magnetic field around it from port A and port C to the signal conditioning subcircuit 1031, so that the signal conditioning subcircuit 1031 determines the driving electrical signal for driving the magnetic field compensation module 101 to operate according to the above-mentioned detection electrical signal.

[0056] Port B and port D of the target bridge 1020 are power receiving ports, which are connected to the power supply ports in the ASIC circuit. Through the above connection relationship, the target bridge 1020 obtains power from the ASIC circuit to maintain the normal operation of the target bridge 1020.

[0057] In addition, the magnetoresistive elements used in the above-mentioned magnetoresistive resistors R1~R4 are generally at least one of Hall elements (Hall), anisotropic magnetoresistive elements (AMR, Anisotropic Magneto Resistance), giant magnetoresistive elements (GMR, Giant Magneto Resistance) or tunnel magnetoresistive elements (TMR, Tunnel Magneto Resistance).

[0058] Then, after the detection current is introduced into the diversion part 1041 of the diversion module 104, the detection magnetic field generated by the detection current at the magnetic field generating part 1042 can cover the above-mentioned target bridge 1020. The magnetic field change brought about by the detection magnetic field generated by the detection current causes the resistance value of each magnetoresistor in the target bridge 1020 to change. Therefore, under the same power supply conditions, there is a difference between the first detection electrical signal output by the target bridge 1020 to the signal conditioning subcircuit 1031 in the ASIC circuit and the zeroth detection electrical signal output by the target bridge 1020 to the signal conditioning subcircuit 1031 in the ASIC circuit when the detection current is not introduced. When the detection current is not introduced, no matter what physical quantity the detection electrical signal takes, the value of the zeroth detection electrical signal should be 0.

[0059] After receiving the first circuit signal with the above-mentioned difference, the signal conditioning subcircuit 1031 processes the above-mentioned first circuit signal to determine the driving electrical signal, and the feedback subcircuit 1032 of the ASIC circuit controls the magnetic field compensation module 101 to operate with the above-mentioned driving electrical signal. The driving magnetic field generated by the driving current at the magnetic field compensation module 101 is superimposed on the above-mentioned detection magnetic field, so that the magnetic field around the target bridge 1020 changes again, thereby restoring the magnetic field to a balanced state.

[0060] If the component of the above-mentioned detection magnetic field at the target bridge 1020 and the component of the driving magnetic field at the target bridge 1020 are balanced, the signal conditioning subcircuit 1031 can determine through the second circuit signal that the two magnetic field components at the current target bridge 1020 are balanced. At this time, the ASIC circuit determines the above-mentioned driving electrical signal as the output signal of the current sensor 10, and outputs the above-mentioned output signal to the external circuit through its output port, thereby completing the closed-loop detection process for the above-mentioned detection current.

[0061] In some embodiments, the magnetic field compensation module 101 includes one or more conductors arranged in parallel with the flow guidance module 104 .

[0062] In some embodiments, the material of the conductor includes at least one of copper or aluminum, and the thickness of the conductor is 0.5 mm to 5 mm.

[0063] Specifically, in order to balance the magnetic field component at the magnetic sensing module 102 generated by the driving current when the magnetic field compensation module 101 is running and the magnetic field component at the magnetic sensing module 102 generated by the detection current in the diversion module 104 at the magnetic field generating unit 1042, it is necessary to control the direction of the driving current to ensure that the components of the two magnetic fields at the magnetic sensing module 102 are in opposite directions. Figure 4 , Figure 4 The figure shows the direction distribution of the magnetic field generated around a straight current, which can be known based on Ampere's law. Figure 3 and Figure 4 , assuming that the direction of the detection current in the magnetic field generating unit 1042 of the flow guiding module 104 is from left to right, according to Ampere's law and Figure 4 , the direction of the component of the detected magnetic field at the target bridge 1020 is perpendicular to the paper and outward. In order to balance the detected magnetic field with the driving magnetic field, the direction of the component of the driving magnetic field generated by the driving current in the magnetic field compensation module 101 at the target bridge 1020 should be perpendicular to the paper and inward. Therefore, the driving current in the magnetic field compensation module 101 should also be a straight current from left to right.

[0064] Considering the above situation, the driving current in the magnetic field compensation module 101 needs to be parallel and in the same direction as the detection current in the magnetic field generating part 1042 of the diversion module 104. Therefore, the magnetic field compensation module 101 includes one or more conductors arranged in parallel with the magnetic field generating part 1042 of the diversion module 104, so as to ensure that the driving current in the above conductor can meet the above conditions. In order to make the driving magnetic field and the detection magnetic field at the magnetic sensitive module 102 equal in size, it is also necessary for the above conductor to be able to withstand driving currents of different intensities according to the size of the detection current, so there are certain requirements for the resistivity and specifications of the conductor. When the overall size of the magnetic field compensation module 101 is constant, the length of the conductor is basically the same as the overall length of the magnetic field compensation module 101. Therefore, in some examples, the material of the conductor can be copper, lead or an alloy of the two to ensure the resistivity of the conductor, and the thickness of the conductor is generally set to be within the range of 0.5mm to 5mm to frame the cross-sectional area range of the conductor, so that the magnetic field compensation module 101 can cope with detection currents of different intensities.

[0065] In some embodiments, the current sensor 10 further includes a power port 105, a ground port 106, and signal output ports 107, 108, the power port is connected to an external power supply, the ground port is grounded, and the signal output port is connected to a dedicated integrated circuit module to output a driving current.

[0066] Specifically, see Figure 5 , Figure 5The appearance of the current sensor 10 is schematically shown, wherein the current guiding portion 1041 of the current guiding module 104 extends out of the outer surface of the current sensor 10 to facilitate connection with an external circuit and introduction and derivation of the detection current.

[0067] Figure 5 Ports 105 to 108 in the figure are respectively four port pins of the current sensor 10, wherein the power port 105 is used to connect to an external power source to power the current sensor 10, so as to ensure the normal operation of the current sensor 10. It should be further explained that the power supply port of the ASIC module 103 is connected to the power supply port 105, that is, the power supply port of the ASIC module 103 draws power from the power supply port 105, and powers the magnetic sensing module 102 through the connection between the power supply port and the power receiving port of the magnetic sensing module 102.

[0068] The grounding port 106 is used for grounding to ensure the working safety of the current sensor 10 .

[0069] The signal output ports 107 and 108 together constitute a set of dual-channel output ports, which are respectively connected to the dual-channel output ports of the dedicated integrated circuit module 103, so as to output the output signal of the current sensor 10 to the external circuit when the two magnetic field components reach equilibrium at the magnetic sensing module 102.

[0070] Also, see Figure 6 , Figure 6 The components of the current sensor 10 and the relative position relationship in another embodiment are shown. In order to reduce the current detection error caused by the parameter error of each component when it leaves the factory, in some examples, two groups of magnetic sensing modules 102 can be set, and the situation where the components of the detection magnetic field and the components of the driving magnetic field at the first group of magnetic sensing modules 102 reach a balanced state corresponds to one output signal, and the situation where the components of the detection magnetic field and the components of the driving magnetic field at the second group of magnetic sensing modules 102 reach a balanced state corresponds to another output signal. In the final output, the dedicated integrated circuit module 103 performs a differential operation on the two groups of output signals and outputs them, thereby using the differential operation to reduce the current detection error caused by the parameter error of each component when it leaves the factory, and further improve the accuracy of current detection.

[0071] The current detection method in the embodiment of the present application, used for the above-mentioned current sensor 10, includes:

[0072] The ASIC module 103 controls the magnetic field compensation module 101 to operate with a driving electrical signal according to the detection current introduced by the flow guidance module 104, wherein the driving electrical signal includes a driving current;

[0073] When the first magnetic field component of the current guiding module 104 and the second magnetic field component of the magnetic field compensation module 101 reach a balanced state at the magnetic sensing module 102 , the ASIC module 103 determines and outputs an output signal of the current sensor 10 .

[0074] The chip in the embodiment of the present application includes the above-mentioned current sensor 10.

[0075] In the description of this specification, the descriptions with reference to the terms "certain embodiments", "in an example", "exemplarily", etc., mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0076] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0077] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A current sensor, characterized in that: The current sensor includes a current guide module, a magnetic sensing module, a dedicated integrated circuit module and a magnetic field compensation module. The current guiding module is configured to introduce and export the detection current. The ASIC module is configured to drive the magnetic field compensation module to operate with a driving electrical signal according to the detection current, wherein the driving electrical signal includes a driving current; The dedicated integrated circuit module is also configured to determine and output the output signal of the current sensor when the first magnetic field component of the diversion module and the second magnetic field component in the magnetic field compensation module reach a state of equilibrium at the magnetic sensitive module, wherein the first magnetic field component is the component of the magnetic field generated by the detection current at the magnetic sensitive module, and the second magnetic field component is the component of the magnetic field generated by the driving current at the magnetic sensitive module.

2. The current sensor according to claim 1, characterized in that: The flow diversion module and the magnetic field compensation module are placed on the same reference plane, and the magnetic sensitive module is arranged between the flow diversion module and the magnetic field compensation module.

3. The current sensor according to claim 1, characterized in that: The dedicated integrated circuit module includes a signal conditioning subcircuit, which is connected to the signal output port of the magnetic sensitive module. The signal conditioning subcircuit is configured to determine the driving electrical signal based on the detection electrical signal processing, and to determine the output signal of the current sensor when the first magnetic field component and the second magnetic field component reach a balanced state, wherein the detection electrical signal is the output signal of the magnetic sensitive module.

4. The current sensor according to claim 3, characterized in that: The ASIC module further includes a feedback subcircuit, which is connected to the magnetic field compensation module and is configured to drive the magnetic field compensation module to operate according to the driving electrical signal.

5. The current sensor according to claim 3, characterized in that: The ASIC module is further configured to supply power to the magnetic sensing module, and a power receiving port of the magnetic sensing module is connected to a power supply port of the ASIC module.

6. The current sensor according to claim 1, characterized in that: The magnetic sensitive module includes a target bridge, and each bridge arm of the target bridge is provided with a magnetic sensitive resistor. The magnetic field sensitive directions of the magnetic sensitive resistors provided on the directly connected bridge arms form a preset angle, and the magnetic field sensitive directions of the magnetic sensitive resistors provided on the bridge arms that are not directly connected are the same.

7. The current sensor according to claim 6, characterized in that: The signal output port of the target bridge is connected to the signal conditioning subcircuit in the ASIC module, and the power receiving port of the target bridge is connected to the power supply port of the ASIC module.

8. The current sensor according to claim 6, characterized in that: The magnetoresistor includes at least one of a Hall element, an anisotropic magnetoresistor element, a giant magnetoresistor element or a tunnel magnetoresistor element.

9. The current sensor according to claim 1, characterized in that: The magnetic field compensation module includes one or more conductors arranged in parallel with the flow guidance module.

10. The current sensor according to claim 9, characterized in that: The material of the conductor includes at least one of copper and aluminum, and the thickness of the conductor is 0.5 mm to 5 mm.

11. The current sensor according to any one of claims 1 to 10, characterized in that: The current sensor also includes a power port, a ground port and a signal output port, the power port is connected to an external power supply, the ground port is grounded, and the signal output port is connected to the dedicated integrated circuit module to output the output signal of the current sensor.

12. A current detection method, characterized in that: The method is used for the current sensor according to any one of claims 1 to 11, and the method comprises: The ASIC module controls the magnetic field compensation module to operate with a driving electrical signal according to the detection current introduced by the current diversion module, wherein the driving electrical signal includes a driving current; When the first magnetic field component of the current guidance module and the second magnetic field component of the magnetic field compensation module reach a balanced state at the magnetic sensing module, the ASIC module determines and outputs an output signal of the current sensor.

13. A chip, characterized in that: The chip comprises the current sensor according to any one of claims 1-11.

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