CN117347698A - Current detection component, current detection circuit and power supply equipment - Google Patents
Current detection component, current detection circuit and power supply equipment Download PDFInfo
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Abstract
The invention provides a current detection assembly, a current detection circuit and power equipment. The current lead is used for accessing the tested current; the self-checking coil is used for generating a self-checking magnetic field; the magnetic sensor structure is used for sensing a magnetic signal generated by the current to be measured and forming a first electric signal, and is used for sensing a self-checking magnetic field and forming a second electric signal; the signal processing unit is used for conditioning and correcting the first electric signal and the second electric signal to form a first conditioning signal and a second conditioning signal; the first conditioning signal is used for representing the magnitude of the detected current to acquire the state of the detected circuit, and the second conditioning signal is used for representing the magnitude of the self-checking current to acquire the state of the current detection component. Whether the sensor is abnormal or whether the measured system or the measured product is abnormal is distinguished by the change of the first conditioning signal and the second conditioning signal.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a current detection assembly, a current detection circuit and power supply equipment.
Background
The current sensor is an interface device between high and low voltages for detecting a current value by using a magnetic field generated by a current in an electrically insulated state. It is mainly divided into four major categories: hall (Hall) current sensors, anisotropic Magnetoresistance (AMR) current sensors, giant Magnetoresistance (GMR) current sensors, tunnel junction magnetoresistance (TMR) current sensors.
The current sensor with the existing structure is mainly used for testing the measured current, has single function and cannot judge the working state of the current sensor in advance or on line. When the current sensor works abnormally, or the measured system or the measured product is abnormal, whether the sensor is abnormal or the measured system or the measured product is abnormal cannot be distinguished, and the fault state cannot be detected, positioned and judged on line.
Disclosure of Invention
Therefore, the current sensor in the prior art has a single function, and the working state of the current sensor cannot be judged in advance or on line. When the current sensor works abnormally, or the measured system or the measured product is abnormal, the problem that whether the sensor is abnormal or the measured system or the measured product is abnormal cannot be resolved, and the fault state cannot be detected, positioned and judged on line.
The present invention thus provides a current sensing assembly comprising:
the current lead is suitable for being connected with a tested current port to access a tested current;
the self-checking coil is arranged above the current lead and is suitable for being connected into a self-checking circuit to load self-checking current and generate a self-checking magnetic field;
a magnetic sensor structure configured to be above a current lead, the magnetic sensor structure for sensing a magnetic signal generated by the current to be measured and forming a first electrical signal, and for sensing the self-test magnetic field and forming a second electrical signal;
the signal processing unit is used for conditioning and correcting the first electric signal and the second electric signal to form a first conditioning signal and a second conditioning signal;
the first conditioning signal is used for representing the magnitude of the detected current to obtain the magnitude of the detected current, and the second conditioning signal is used for representing the magnitude of the self-checking current to obtain the state of the current detection component.
Optionally, the current detection assembly further comprises a filter, wherein the filter is suitable for being arranged on an external circuit, and the filter is connected with the signal processing unit.
Optionally, the current detecting assembly includes a first arm and a second arm, and the current flowing on the first arm is opposite to the current flowing on the second arm;
the magnetic sensor structure comprises a first magnetic sensor chip and a second magnetic sensor chip, wherein the magnetic sensor chip is used for sensing a magnetic signal generated by a measured current through a magnetic induction element, the magnetic sensor structure converts the magnetic signal into an electric signal, the first magnetic sensor chip is arranged on the first support arm, and the second magnetic sensor chip is arranged on the second support arm.
Optionally, the current detection component includes a first magnetic sensor chip and a second magnetic sensor chip, wherein the first magnetic sensor chip includes a first magnetic resistor and a third magnetic resistor, and the second magnetic sensor chip includes a second magnetic resistor and a fourth magnetic resistor;
wherein the first, second, third and fourth magnetoresistors are configured as a full bridge circuit.
Optionally, in the above current detection assembly, the signal processing unit includes at least two programmable operational amplifiers, and any one of the programmable operational amplifiers includes: the circuit comprises at least two connected operational amplifiers, a decoder module and a resistance switch array module, wherein the plurality of connected operational amplifiers are used for amplifying the electric signals step by step, and the attenuation of the input signals is controlled by the resistance switch array module according to the decoding result output by the decoder module;
at least one filter is arranged between two of the programmable operational amplifiers.
Optionally, the above-mentioned current detection assembly further includes a base frame structure and a substrate, the base frame structure is a semiconductor package frame, the signal processing unit and the magnetic sensor structure are disposed on the substrate, the substrate is disposed above the circuit wire, the current wire is disposed between the substrate and the base frame structure, and the current wire and the base frame structure are integrally formed or detachably connected.
Optionally, the above current detection assembly further includes: and each end of each current wire is respectively connected with one or more wire pins.
The invention provides a current detection circuit, which comprises the current detection component and a self-checking circuit;
the self-checking circuit is connected with the self-checking coil and is used for loading self-checking current.
Optionally, the self-checking circuit comprises a triode, a voltage stabilizing diode and a current limiting resistor which are connected.
The invention provides power supply equipment which comprises the detection circuit and a power supply circuit.
The technical scheme of the invention has the following advantages:
1. the present invention provides a current detection assembly comprising: current wires, self-test coils, magnetic sensor structures, and signal processing units. The current lead is suitable for being connected with a tested current port to be connected with tested current; the self-checking coil is arranged above the current lead and is suitable for being connected into a self-checking circuit to load self-checking current and generate a self-checking magnetic field; a magnetic sensor structure configured to sense a magnetic signal generated by the current being measured and form a first electrical signal, and to sense the self-test magnetic field and form a second electrical signal, over the current wire; the signal processing unit is used for conditioning and correcting the first electric signal and the second electric signal to form a first conditioning signal and a second conditioning signal; the first conditioning signal is used for representing the magnitude of the detected current to obtain the state of the detected circuit, and the second conditioning signal is used for representing the magnitude of the self-checking current to obtain the state of the current detection component.
The current detection component with the structure has the advantages that the magnetic sensor structure realizes current induction on the current wire, so that common current is detected, the signal processing unit realizes conditioning and correction of an electric signal, and the current flowing through the current wire is detected; meanwhile, the self-checking coil and the self-checking circuit are matched, the sensor function and the working state are detected through the magnetic sensor structure, the self-checking function of the sensor is further realized, and therefore the reliability of the sensor is improved. Specifically, when the current detection component works abnormally or the measuring system is abnormal, the change of the first conditioning signal and the second conditioning signal sensed by the current detection component with the structure can be distinguished: whether the sensor is abnormal or whether the measured system or the measured product is abnormal or not, and further, the fault state can be detected, positioned and judged on line. Meanwhile, the current detection component with the structure is used as a chip-level current detection component with a self-checking function, and has the characteristics of small volume, compact structure and capability of meeting various detection requirements with higher reliability requirements.
2. The invention provides a current detection assembly, a magnetic sensor structure comprises at least one magnetic sensor chip, wherein the magnetic sensor chip is used for inducing a magnetic signal generated by a detected current through a magnetic induction element and converting the magnetic signal into an electric signal; the magnetic sensor structure comprises a first magnetic sensor chip and a second magnetic sensor chip, the first magnetic sensor chip comprises a first magnetic resistor and a third magnetic resistor, the second magnetic sensor chip comprises a second magnetic resistor and a fourth magnetic resistor, and the first magnetic resistor, the second magnetic resistor, the third magnetic resistor and the fourth magnetic resistor are constructed into a full-bridge circuit, so that a gradient full-bridge scheme is realized, and the anti-interference capability is high.
3. The signal processing unit of the current detection component is a programmable operational amplifier. The programmable operational amplifier includes: the circuit comprises at least two connected operational amplifiers, a decoder module and a resistance switch array module, wherein the plurality of connected operational amplifiers are used for amplifying electric signals or first conditioning signals step by step, and the decoding result output by the decoder module is used for controlling the attenuation of the resistance switch array module to attenuate the input signals, so that the gain of the amplifier is programmable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a current detecting component in embodiment 1 provided by the present invention;
FIG. 2 is a schematic diagram showing electrical connection of four magnetic resistors in the current detecting device in embodiment 1;
FIG. 3 is a schematic diagram of a programmable operational amplifier in the current detection device in embodiment 1;
FIG. 4 is a schematic diagram of a current detection circuit in embodiment 2 of the present invention
FIG. 5 is a schematic diagram of a self-test circuit in embodiment 3 of the present invention
Reference numerals:
1-current wires;
2-magnetic sensor structure;
21-a first magnetic sensor chip; 211-a first magnetoresistance; 212-a third magnetoresistance;
22-a second magnetic sensor chip; 221-a second magnetoresistance; 222-fourth magnetoresistance; 23-a first port; 24-a second port; 25-a first output; 26-a second output;
3-self-checking coils;
4-a signal processing unit; a 41-operational amplifier; a 42-decoder module; a 43-resistor switch array module;
a 5-pedestal structure;
6-substrate
7-external circuitry.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
The present embodiment provides a current detection assembly, as shown in fig. 1 to 4, including: a current lead 1, a self-checking coil 3, a magnetic sensor structure 2 and a signal processing unit 4, wherein the current lead 1 is suitable for being connected with a tested current port to be connected with tested current; the self-checking coil 3 is arranged above the current lead 1 and is suitable for being connected into a self-checking circuit to load self-checking current and generate a self-checking magnetic field; a magnetic sensor structure 2 is configured above the current lead 1, wherein the magnetic sensor structure 2 is used for sensing a magnetic signal generated by the tested current and forming a first electric signal, and is used for sensing the self-checking magnetic field and forming a second electric signal; the signal processing unit 4 is used for conditioning and correcting the first electric signal and the second electric signal to form a first conditioning signal and a second conditioning signal; the first conditioning signal is used for representing the magnitude of the detected current to obtain the magnitude of the detected current, and the second conditioning signal is used for representing the magnitude of the self-checking current to obtain the state of the current detection component.
The current detection component provided in this embodiment further includes an external filter element, where the filter element is disposed on an external circuit external to the current detection component and is electrically connected between the programmable operational amplifier PGA1 and the programmable operational amplifier PGA2, and is configured to receive the output signal Vout1 processed by PGA1, reduce noise of Vout1, and return to the current detection component to output the signal to the PGA2 side.
The filtering circuit of the filtering component is used for filtering the output signal Vout1 processed by the PGA 1; specifically, the filter circuit may be formed by a single structure of the resistor structure and the capacitor structure or by a combination of both structures.
As shown in fig. 4, in the embodiment, the filter on the external circuit is a capacitor, and the two outputs are Vout1 and Vout2, respectively, where Vout1 is an output signal processed by PGA1, vout2 is an output signal processed by PGA2, and Vout2 can detect a small-range ac signal; the PGA1 and the PGA2 can be provided with different amplification factors of products according to requirements; the TMR signal is an electrical signal output by the magnetic sensor structure 2.
The specific measurement mode is as follows: after the magnetic sensor structure 2 in the current detection assembly detects a magnetic field generated by current through the magneto-resistance effect, an electric signal is transmitted to the PGA1, the electric signal is processed by the PGA1 and then Vout1 is output, and the Vout1 can be used for detecting wide-range alternating current and direct current signals; meanwhile, the Vout1 signal can be processed by a capacitor in an external circuit, then the direct current signal is filtered, and the filtered direct current signal returns to the current detection component to enter the input end of the PGA2 for processing, and then Vout2 is output from the output side, and Vout2 can be used for detecting a small-range alternating current signal. The programmable amplifiers (PGA 1 and PGA 2) can set different amplification factors of the product according to the requirements, for example: the amplified parameter corresponding to PGA1 is 2.5v±2v@20a, that is, the full scale range is 20A, and the PGA2 is set to 100 times of amplification factor, then the signal is amplified by PGA2 and is 2.5v± [email protected], that is, the full scale range corresponds to 0.2A, and at this time, the current detection component can detect the 20A current signal and detect the micro current signal of 0.2A. It is noted that the full scale output of the current sensing component should be 2.5v+2v (positive gain) or 2.5V-2V (negative gain).
In this example, if the measured current is DC 20a+ac 0.2a or AC 0.2A, where AC 0.2A is a small-amplitude alternating current, after passing through the current detection circuit shown in fig. 4, vout1 is filtered after passing through the capacitor, that is, DC 20A is filtered, so that the signal output from the capacitor side is only AC 0.2A, and thus the measured current passes through the current detection circuit shown in fig. 4, after the alternating current signal 0.2A passes through PGA21 and PGA2, the full-scale voltage output of Vout2 is 2.5v+2v (positive gain) or 2.5V-2V (negative gain), thereby realizing detection of a small-amplitude alternating current.
As shown in fig. 1, the current lead 1 comprises a first support arm and a second support arm, wherein the current flowing on the first support arm is opposite to the current flowing on the second support arm; in the current detection assembly provided in this embodiment, the current lead 1 is a U-shaped current lead 1, the first arm and the second arm are two arms of the U-shaped current lead 1 respectively, and the current to be detected flows in from the first arm of the current lead 1 and flows out from the second arm. In other alternative embodiments, the current guide may be V-shaped or u-shaped, so long as it is ensured that the current flowing through the first arm and the second arm has different flow directions.
The magnetic sensor structure 2 comprises a first magnetic sensor chip 21 and a second magnetic sensor chip 22, the magnetic sensor structure 2 is used for sensing a magnetic signal generated by a measured current through a magnetic induction element, the magnetic sensor structure 2 converts the magnetic signal into an electric signal, in this embodiment, the first magnetic sensor chip 21 is arranged on the first support arm, and the second magnetic sensor chip 22 is arranged on the second support arm. The first magnetic sensor chip 21 and the second magnetic sensor chip 22 are symmetrically arranged with respect to the U-shaped current lead 1. Generally, the number of the magnetic sensor chips is an even number, so in other alternative embodiments, the number of the magnetic sensor chips may be four, six, eight or more, so long as the magnetic sensor chips can be symmetrically disposed on two sides of the U-shaped wire.
In this embodiment in particular, the first magnetic sensor chip 21 includes a first magnetic resistor 211 and a third magnetic resistor 212, and the second magnetic sensor chip 22 includes a second magnetic resistor 221 and a fourth magnetic resistor 222. It should be noted that the specific positions of the respective magnetic resistors in the corresponding chips shown in fig. 1 are only schematic, and the actual mounting positions of the magnetic resistors on the respective chips can be adjusted and changed according to the use requirements.
In this embodiment, the physical properties of the first magnetic resistor 211, the second magnetic resistor 221, the third magnetic resistor 212 and the fourth magnetic resistor 222 are the same, and the magnetic field sensitivity directions are the same, and since the magnetic fields are generated around the current wire 1 which is fed with the current to be measured, the magnetic fields generated at the two arms of the U-shaped current wire 1 respectively act on the first magnetic resistor 211, the second magnetic resistor 221, the third magnetic resistor 212 and the fourth magnetic resistor 222, so that the resistance values of the four magnetic resistors are changed, and then output voltages (namely electric signals) are generated, so that a gradient full-bridge scheme is realized, and the anti-interference capability is strong.
As shown in fig. 2, which is a schematic diagram of electrical connection of four magnetic resistors, the first magnetic resistor 211, the second magnetic resistor 221, the third magnetic resistor 212 and the fourth magnetic resistor 222 together form a full bridge structure. The driving voltage is introduced between the first port 23 and the second port 24, the first output end 25 and the second output end 26 are output ports, and since the resistance values of the magnetic resistors are changed along with the external magnetic field, and meanwhile, the current directions of the two arms of the U-shaped current lead 1 are opposite and the values are equal, the resistance values of the first magnetic resistor 211 and the second magnetic resistor 221 are changed oppositely, the resistance values of the third magnetic resistor 212 and the fourth magnetic resistor 222 are also changed oppositely, meanwhile, the resistance values of the first magnetic resistor 211 and the third magnetic resistor 212 of the first magnetic sensor chip 21 positioned on the left side wall are changed identically, the resistance values of the second magnetic resistor 221 and the fourth magnetic resistor 222 of the second magnetic sensor chip 22 positioned on the right side wall are changed identically, and therefore, the output voltage is generated between the two output ports of the bridge. The magnetic resistor is an anisotropic resistor element, a giant magnetoresistance element or a magnetic tunnel junction element, and the giant magnetoresistance element or the magnetic tunnel junction element can be of a multilayer film structure with nanometer-scale thickness, so that the current detection assembly is small in size, high in sensitivity and greatly reduced in cost. In this embodiment, the magneto-inductive element is specifically a TMR tunnel magneto-resistive element.
In other alternative embodiments, only one magnetoresistive element is disposed on each magnetic sensor chip, and at this time, the two magnetoresistive elements may form a half-bridge structure, which also satisfies the requirement of strong anti-interference capability.
In the present embodiment, the signal processing unit 4 includes two programmable operational amplifiers, namely PGA1 and PGA2. The programmable operational amplifiers PGA1 and PGA2 include: the programmable operational amplifiers PGA1 and PGA2 are provided with at least two operational amplifiers 41, a decoder module 42 and a resistor switch array module 43, wherein the plurality of operational amplifiers 41 connected with each other are used for amplifying the electric signals step by step to form conditioning signals, and then the decoding result output by the decoder module 42 controls the attenuation of the resistor switch array module 43 to attenuate the attenuation of the input signals, so that the gain of the programmable operational amplifiers PGA1 and PGA2 can be programmed.
In particular in this embodiment, as shown in fig. 3, three operational amplifiers 41 are used, a gain DAC is used to set the power supply parameters of the magnetic sensor structure 2, and a Zero DAC is used to configure the product parameters. The first output terminal 25 and the second output terminal 26 of the full-bridge circuit are electrically connected to VIP and VIN ports, respectively, and the output voltage of the magnetic sensor structure 2 side changes along with the change of the induced magnetic field, and the programmable operational amplifier PGA1 conditions the output voltage and outputs a normalized standard analog signal, for example, 2.5±2v. The programmable operational amplifier PGA2 further amplifies the output of the programmable operational amplifier PGA1 by setting different amplification ratio coefficients, thereby realizing dual-range output. Of course, the number of operational amplifiers 41 is selected according to the actual amplification requirement.
In this embodiment, the current detection assembly is packaged by the standard SOIC16 as a whole, but other packaging methods may be used in alternative embodiments.
The current detection assembly further comprises a base frame structure 5 and a substrate 6, wherein the base frame structure 5 is a semiconductor packaging frame, the current wires 1 are arranged on the base frame structure 5, the base frame structure 5 and the current wires 1 are integrally formed or detachably connected, a specific forming mode can be selected according to actual use requirements, and an optional mode is to connect the current wires 1 with the frame in an adhesive mode, so that the current detection assembly is easy to detach and install. The substrate 6 is arranged above the current lead 1, and the self-test coil 3, the magnetic sensor structure 2 and the signal processing unit 4 are all arranged above the substrate 6. The self-test coil 3, the magnetic sensor structure 2 and the signal processing unit 4 are all arranged on a substrate 6. The signal processing unit 4 can be flexibly changed according to the use condition of the client under the condition of selecting a programmable operational amplifier, and has wide applicability.
The current detection assembly provided in this embodiment further includes: the conductor pins are arranged at the edge of the base structure 5, and each end of each current conductor 1 is connected with one or more conductor pins. Specifically, one end of the current lead 1 may be connected to one lead pin, and of course, a plurality of lead pins may be connected, as long as it is ensured that the lead pins can guide current to the current lead 1 side. Of course, whether to set the lead pins can also be selected according to actual requirements.
According to the current detection component provided by the embodiment, the magnetic sensor structure 2 is used for realizing current induction of the current lead 1, so that common current is detected, the signal processing unit 4 is used for conditioning and correcting the electric signal, the current flowing through the current lead 1 is detected, the signal processing unit 4 comprises 2 programming amplifiers PGA1 and PGA2, the Vout1 signal obtained after the electric signal is processed by the PGA1 can represent the magnitude of wide-range current, the Vout2 signal obtained after the Vout1 is processed by an external circuit can represent the magnitude of small-range current, and further the dual-range measurement of large current and small current is realized. Meanwhile, the self-checking coil 3 and the self-checking circuit are matched, the sensor function and the working state are detected through the magnetic sensor structure 2, the self-checking function of the sensor is further realized, and therefore the reliability of the sensor is improved. Specifically, when the current detection component is abnormal in operation or the measurement system is abnormal, changes of Vout1 and Vout2 perceived by the current detection component of this structure can be distinguished: whether the current detection component is abnormal or whether the measured system or the measured product is abnormal or not, and further, the fault state can be detected, positioned and judged on line. Meanwhile, the current detection component with the structure is used as a chip-level current detection component with a self-checking function, and has the characteristics of small volume, compact structure and capability of meeting various detection requirements with higher reliability requirements.
Example 2
In this embodiment, a current detection circuit is provided, including the current detection component and the self-detection circuit provided in embodiment 1. The self-checking circuit is connected with the self-checking coil 3, the self-checking circuit is used for loading self-checking current, the self-checking coil is set to be U-shaped, and of course, the self-checking coil with a similar U-shaped structure can be adopted in the same way, and the same technical effect can be achieved.
The current detection circuit provided by the embodiment comprises a triode, a voltage stabilizing diode and a current limiting resistor which are connected. As shown in FIG. 5, the self-checking circuit provided in this embodiment has a VCC2 input with 5V voltage, a CHK0 port connected to a trigger pin (check pin) of the current detecting component, a 123 port being a trigger pin of the self-checking circuit, a square wave with a frequency of 10kHz greater than 3.3V being input to the trigger pin of the self-checking circuit, and the CHK0 port obtaining an AC current signal, i.e. a self-checking current signal after passing through the self-checking circuit. The CHK0 port is connected to a trigger pin (check pin) of the current detection component, that is, the trigger pin (check pin) of the current detection component is fed with a self-checking current signal, one end of the self-checking coil is connected to the check pin, and the other end of the self-checking coil is grounded, so that self-checking current is obtained in the self-checking coil, the magnetic sensor structure 2 in the current detection component detects a magnetic field generated by the self-checking current through the magneto-resistance effect, then an electric signal is transmitted to the PGA1, vout1 is output after being processed by the PGA1, and Vout2 can be output from the output side after being processed by returning to the input end of the PGA2 after being processed by the internal return current detection component in an external circuit. By reading the Vout2 output, it is determined whether a problem occurs in the sensor itself or in the system under test or the product under test.
Specifically, the self-checking is generally performed when the current detection component is not fed with the current to be detected, and if the current detection component fails, the Vout2 is not output or is incorrectly output after the self-checking current is fed. If the fault problem of the tested system or the tested product is solved, the output of Vout2 is correct after the self-checking current is introduced.
Example 3
In this embodiment, there is provided a power supply apparatus including the detection circuit and the power supply circuit provided in embodiment 2.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
1. A current sensing assembly, comprising:
-a current lead (1), the current lead (1) being adapted to be connected with a current port under test for accessing a current under test;
the self-checking coil (3) is arranged above the current lead (1) and is suitable for being connected into a self-checking circuit to load self-checking current and generate a self-checking magnetic field;
-a magnetic sensor structure (2) configured to be over a current wire (1), the magnetic sensor structure (2) being adapted to sense a magnetic signal generated by the current to be measured and to form a first electrical signal, and to sense the self-checking magnetic field and to form a second electrical signal;
the signal processing unit (4) is used for conditioning and correcting the first electric signal and the second electric signal to form a first conditioning signal and a second conditioning signal;
the first conditioning signal is used for representing the magnitude of the detected current to obtain the magnitude of the detected current, and the second conditioning signal is used for representing the magnitude of the self-checking current to obtain the state of the current detection component.
2. The current detection assembly according to claim 1, further comprising a filter element, said filter element being adapted to be arranged on an external circuit and said filter element being connected to the signal processing unit (4).
3. The current sensing assembly of claim 1, wherein,
the current lead (1) comprises a first support arm and a second support arm, and the current flowing on the first support arm is opposite to the current flowing on the second support arm;
the magnetic sensor structure (2) comprises a first magnetic sensor chip (21) and a second magnetic sensor chip (22), wherein the magnetic sensor chip is used for sensing magnetic signals generated by measured current through a magnetic induction element, the magnetic sensor structure (2) converts the magnetic signals into electric signals, the first magnetic sensor chip (21) is arranged on the first support arm, and the second magnetic sensor chip (22) is arranged on the second support arm.
4. A current sensing assembly according to claim 3, wherein,
the first magnetic sensor chip (21) includes a first magnetic resistor (211) and a third magnetic resistor (212), and the second magnetic sensor chip (22) includes a second magnetic resistor (221) and a fourth magnetic resistor (222);
wherein the first magnetic resistor (211), the second magnetic resistor (221), the third magnetic resistor (212) and the fourth magnetic resistor (222) are configured as a bridge circuit of a full bridge.
5. The current sensing assembly of claim 2, wherein,
the signal processing unit comprises at least two programmable operational amplifiers, any one of which comprises: the circuit comprises at least two operational amplifiers (41), a decoder module (42) and a resistance switch array module (43) which are connected, wherein the plurality of operational amplifiers (41) which are connected are used for amplifying the electric signals step by step, and the attenuation of the input signals is controlled by the resistance switch array module (43) according to the decoding result output by the decoder module (42);
at least one filter is arranged between two of the programmable operational amplifiers.
6. The current sensing assembly of any one of claims 1-5, wherein,
still include bed frame structure (5) and base plate (6), bed frame structure (5) are semiconductor package frame, signal processing unit (4) and magnetic sensor structure (2) set up on the base plate, the base plate sets up the top of electric current wire (1), electric current wire (1) set up in base plate (6) with between bed frame structure (5), just electric current wire (1) with bed frame structure (5) integrated into one piece can dismantle the connection.
7. The current sensing assembly of claim 6, wherein,
further comprises: and the lead pins are arranged at the edge of the base frame structure (5), and each end of each current lead (1) is respectively connected with one or more lead pins.
8. A current sensing circuit comprising the current sensing assembly of any one of claims 1-7 and a self-test circuit;
the self-checking circuit is connected with the self-checking coil (3) and is used for loading self-checking current.
9. The current sensing circuit of claim 8, wherein the self-test circuit comprises a transistor, a zener diode, and a current limiting resistor connected.
10. A power supply device, characterized in that it comprises a detection circuit as claimed in claim 8 or 9 and a supply circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311435630.7A CN117347698A (en) | 2023-10-31 | 2023-10-31 | Current detection component, current detection circuit and power supply equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311435630.7A CN117347698A (en) | 2023-10-31 | 2023-10-31 | Current detection component, current detection circuit and power supply equipment |
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| JPH07333263A (en) * | 1994-06-13 | 1995-12-22 | Toyo Commun Equip Co Ltd | Current pulse detector |
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| CN116482432A (en) * | 2023-03-13 | 2023-07-25 | 蚌埠希磁科技有限公司 | Current sensor, current detection circuit and power supply device |
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2023
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| JPH07333263A (en) * | 1994-06-13 | 1995-12-22 | Toyo Commun Equip Co Ltd | Current pulse detector |
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