CN216310107U

CN216310107U - Digital quantity Hall current sensor and sensor debugging circuit

Info

Publication number: CN216310107U
Application number: CN202122409600.1U
Authority: CN
Inventors: 尹武生; 曾浩
Original assignee: Shenzhen Socan Technology Co ltd
Current assignee: Shenzhen Socan Technology Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-04-15
Anticipated expiration: 2031-09-30

Abstract

The utility model discloses a digital quantity Hall current sensor and a sensor debugging circuit, relating to the technical field of circuits; the device comprises a first current acquisition circuit, a second current acquisition circuit, a main control circuit and a communication circuit; the first current acquisition circuit and the second current acquisition circuit are both provided with acquisition ends and output ends, the acquisition ends of the first current acquisition circuit and the second current acquisition circuit are both electrically connected to the Hall effect chip, and the output ends of the first current acquisition circuit and the second current acquisition circuit are both connected to the main control circuit; the master control circuit is electrically connected with the communication circuit and is used for converting the two paths of calibration voltages into digital signals and transmitting the digital signals to an upper computer for display through the communication circuit; the utility model has the beneficial effects that: through the form of double-circuit detection output, the problem that the conventional Hall current sensor is inaccurate in small current measurement is solved, and the output signal is a digital quantity signal and has strong anti-interference performance.

Description

Digital quantity Hall current sensor and sensor debugging circuit

Technical Field

The utility model relates to the technical field of circuits, in particular to a digital quantity Hall current sensor and a sensor debugging circuit.

Background

The Hall current sensor is manufactured according to the Hall principle, and the current of a current-carrying conductor is indirectly measured by measuring the Hall potential sensed by the Hall chip. Because the output of the Hall device and the measured current have good linear relation, and the Hall device and the measured current undergo the electro-magnetic-electro conversion, and have high insulation and voltage resistance, the Hall device is widely applied to various fields needing isolating measured current, such as variable frequency speed regulation, inverter devices, UPS power supplies and the like.

The output signal of the Hall current sensor in the market is an analog quantity signal, the anti-interference performance is poor in remote transmission, the output is one-to-one measurement output, a standard voltage signal is output according to the current of a measured object according to a certain proportional relation, and in practical application, the sensor with the large rated value is inaccurate in small current measurement, the sensor with the large rated value is usually selected and used together with the sensor with the small rated value, and the sensor with the small rated value is in an electric saturation state for a long time and is extremely easy to damage.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a digital quantity Hall current sensor with two internal voltage detections and a sensor debugging circuit.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the digital Hall current sensor debugging circuit is improved in that the digital Hall current sensor debugging circuit comprises a first current acquisition circuit, a second current acquisition circuit, a main control circuit and a communication circuit;

the first current acquisition circuit and the second current acquisition circuit are respectively provided with an acquisition end and an output end, the acquisition ends of the first current acquisition circuit and the second current acquisition circuit are electrically connected on the Hall effect chip, the output ends of the first current acquisition circuit and the second current acquisition circuit are respectively connected to the main control circuit, and the first current acquisition circuit and the second current acquisition circuit are used for transmitting calibration voltage to the main control circuit;

the main control circuit is electrically connected with the communication circuit and is used for converting the two paths of calibration voltages into digital signals and transmitting the digital signals to an upper computer for display through the communication circuit.

In the above structure, the first current collecting circuit collects an initial current signal in a direct current or alternating current form, and linearly amplifies the initial current signal to a calibration voltage according to a rated value of the sensor.

In the above structure, the second current collecting circuit linearly amplifies the initial current signal in a direct current or alternating current form to a calibration voltage according to 10% of a rated value of the sensor.

In the structure, the communication circuit uploads the digital signal to an upper computer by an RS485 protocol.

In the above structure, the power supply further comprises a voltage stabilizing circuit, and the voltage stabilizing circuit is electrically connected to the first current collecting circuit, the main control circuit and the communication circuit respectively.

The utility model also provides a double-output Hall current sensor, which is improved in that the sensor comprises a shell, an annular magnetic core, a socket and a circuit board, wherein the annular magnetic core and the circuit board are fixed in the shell, and a Hall effect chip is electrically connected to the circuit board;

the socket is positioned outside the shell and is electrically connected with the circuit board;

the circuit board is integrated with the digital quantity Hall current sensor debugging circuit.

Furthermore, the annular magnet and the socket are fixed inside the shell through potting.

The utility model has the beneficial effects that: the problem that the conventional Hall current sensor measures small current inaccurately is solved through a double-path detection output mode; and the RS-485 serial bus standard is adopted, so that the anti-interference performance is strong.

Drawings

Fig. 1 is a schematic circuit diagram of a digital hall current sensor debugging circuit according to the present invention.

Fig. 2 is a diagram of an embodiment of a first current collection circuit and a second current collection circuit in a digital hall current sensor debugging circuit according to the present invention.

Fig. 3 is a diagram of an embodiment of a main control circuit in a digital hall current sensor debugging circuit according to the present invention.

Fig. 4 is a diagram of a communication circuit in a digital hall current sensor debugging circuit according to an embodiment of the present invention.

FIG. 5 is a diagram of an embodiment of a power supply voltage stabilizing circuit in a digital Hall current sensor debugging circuit according to the present invention.

Fig. 6 is a schematic perspective view of a digital hall current sensor according to the present invention.

Fig. 7 is an exploded view of a digital hall current sensor according to the present invention.

Detailed Description

The utility model is further illustrated with reference to the following figures and examples.

The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. All technical characteristics in the utility model can be interactively combined on the premise of not conflicting with each other.

Referring to fig. 1, the utility model discloses a debugging circuit of a digital quantity hall current sensor, which solves the defect that the conventional hall current sensor measures small current inaccurately in a form of double-path detection output. Specifically, the circuit comprises a first current acquisition circuit 10, a second current acquisition circuit 20, a main control circuit 30 and a communication circuit 40; the first current acquisition circuit 10 and the second current acquisition circuit 20 are respectively provided with an acquisition end and an output end, the acquisition ends of the first current acquisition circuit 10 and the second current acquisition circuit 20 are electrically connected to the Hall effect chip 50, the output ends of the first current acquisition circuit 10 and the second current acquisition circuit 20 are respectively connected to the main control circuit 30, and the first current acquisition circuit 10 and the second current acquisition circuit 20 are used for transmitting a calibration voltage to the main control circuit 30; in this embodiment, the first current collecting circuit 10 linearly amplifies an initial current signal in a direct current or alternating current form to a calibration voltage according to a rated value of the sensor; the second current collecting circuit 20 linearly amplifies the initial current signal in a direct current or alternating current form to a calibration voltage according to 10% of a rated value of the sensor.

Further, the main control circuit 30 is electrically connected to the communication circuit 40, and the main control circuit 30 is configured to convert the two paths of calibration voltages into digital signals, and upload the digital signals to the upper computer 60 through the communication circuit for display; in this embodiment, the communication circuit 40 uploads the digital signal to the upper computer 60 according to an RS485 protocol. In addition, the digital hall current sensor debugging circuit further includes a voltage stabilizing circuit 200, and the voltage stabilizing circuit 200 is electrically connected to the first current collecting circuit 10, the main control circuit 30 and the communication circuit 40, respectively.

With respect to the first current collecting circuit 10 and the second current collecting circuit 20, as shown in fig. 2, the present invention provides a specific embodiment. For the master control circuit 30, as shown in fig. 3, the present invention provides a specific embodiment. For the communication circuit 40, as shown in fig. 4, the present invention provides an embodiment. As shown in FIG. 5, an embodiment of the present invention provides a voltage regulation circuit 200. The circuit structure in the above embodiments refers to the drawings, and the specific circuit structure in this embodiment will not be described in detail.

Through foretell circuit structure, sensor debugging circuit utilizes electromagnetic induction and hall effect principle, primary side electric current (Ip) when passing through a wire, will produce a magnetic field around the wire, the size of this magnetic field is directly proportional with the electric current that flows through the wire, hall effect chip 50 senses the signal through the magnetic core gathering, through the processing of fortune amplifier and enlargiing, then convert digital signal into through high accuracy AD, agreed according to the procedure by the singlechip, self-calibration zero point and amplitude, and pass through communication circuit 40 with data, upload to host computer 60 and show, host computer 60 carries out real time monitoring to primary side electric current output condition. Therefore, the digital quantity Hall current sensor debugging circuit solves the problem that the conventional Hall current sensor is inaccurate in measuring small current through a double-path detection output mode; the sensor has the functions of automatically calibrating zero and amplitude, overcomes the defect of zero offset of the sensor, and has strong anti-interference performance by adopting an RS-485 serial bus standard.

Referring to fig. 6 and 7, the present invention further provides a digital hall current sensor, in this embodiment, the digital hall current sensor includes a housing 70, an annular magnetic core 80, a socket 90, and a circuit board 100, wherein the annular magnetic core 80 and the circuit board 100 are both fixed inside the housing 70, and the hall effect chip 50 is electrically connected to the circuit board 100; the socket 90 is located outside the housing 70 and electrically connected to the circuit board 100; in this embodiment, the ring magnet and the socket 90 are fixed inside the housing 70 by potting; in addition, the above digital hall current sensor debugging circuit is integrated on the circuit board 100, and thus the structure of the digital hall current sensor debugging circuit will not be described in detail.

While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. A digital Hall current sensor debugging circuit is characterized by comprising a first current acquisition circuit, a second current acquisition circuit, a main control circuit and a communication circuit;

the master control circuit is electrically connected with the communication circuit and is used for converting the two paths of calibration voltages into digital signals and uploading the digital signals to an upper computer for display through the communication voltage.

2. The digital hall current sensor debugging circuit of claim 1 wherein said first current pickup circuit linearly amplifies to a nominal voltage according to the sensor rating by picking up an initial current signal in either dc or ac form.

3. The digital hall current sensor debugging circuit of claim 1 wherein said second current pickup circuit linearly amplifies to nominal voltage by pickup of an initial current signal in either direct or alternating form at 10% of the sensor rating.

4. The digital hall current sensor debugging circuit of claim 1 wherein said communication circuit uploads digital signals to an upper computer using RS485 protocol.

5. The digital hall current sensor debugging circuit of claim 1, further comprising a voltage regulator circuit, wherein the voltage regulator circuit is electrically connected to the first current collecting circuit, the main control circuit and the communication circuit, respectively.

6. A digital quantity Hall current sensor is characterized by comprising a shell, an annular magnetic core, a socket and a circuit board, wherein the annular magnetic core and the circuit board are fixed inside the shell, and a Hall effect chip is electrically connected to the circuit board;

the circuit board is integrated with the digital Hall current sensor debugging circuit according to any one of claims 1-5.

7. The digital hall current sensor of claim 6 wherein the toroidal core and the socket are secured to the interior of the housing by potting.