Apparatus for switching multiple sensors, and measurement system

Abstract

The present application provides an apparatus for switching multiple sensors, and a measurement system. The apparatus comprises: at least one first power supply, a plurality of fluxgate current sensors, at least one measurement instrument, and a plurality of switches, wherein the first power supply is configured to be electrically connected to the fluxgate current sensors to supply power to the fluxgate current sensors; the measurement instrument is configured to be electrically connected to the fluxgate current sensors to measure the output quantities of the fluxgate current sensors; the switches are configured to be connected between the fluxgate current sensors, the first power supply, and the measurement instrument, and to control, by controlling the states of the switches, the plurality of fluxgate current sensors to be switched on the basis of a preset duration. Alternatively, when the apparatus for switching multiple sensors further comprises a second power supply: the second power supply is configured to be electrically connected to the first power supply to supply power to the first power supply; the switches are configured to be connected between the first power supply and the second power supply, and to control, by controlling the states of the switches, the plurality of fluxgate current sensors to be switched on the basis of the preset duration. The apparatus can reduce the problem of interference superposition.

Description

A multi-channel sensor switching device and detection system

[0001] This application claims priority to Chinese Patent Application No. 202520148370.3, filed on January 22, 2025, entitled “A Multi-Sensor Switching Device and Detection System”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of sensor detection technology, and in particular to a multi-channel sensor switching device and detection system. Background Technology

[0003] In current measurement, current sensors play a crucial role. Among them, fluxgate current sensors have attracted the attention and promotion of researchers due to their unique working principle and wide range of applications.

[0004] A fluxgate current sensor is a current sensor that uses fluxgate technology to measure current. Its basic principle is based on the nonlinear magnetization characteristics of ferromagnetic materials. When the current to be measured passes through the coil of the sensor, a magnetic field is generated in the ferromagnetic material. The magnetic field will cause the magnetization state of the ferromagnetic material to change. By detecting this change in magnetization state, the magnitude of the current to be measured can be indirectly measured.

[0005] Fluxgate current sensors have high measurement accuracy and stability, and are widely used in power systems, industrial automation and new energy fields.

[0006] Utility Model Content

[0007] This application provides a multi-channel sensor switching device and detection system to reduce the interference superposition problem caused by multiple fluxgate current sensors working simultaneously.

[0008] In a first aspect, this application provides a multi-channel sensor switching device, wherein the multi-channel sensor switching device includes: at least one first power supply, multiple fluxgate current sensors, at least one detection instrument, and multiple switches:

[0009] The first power supply is configured to be electrically connected to the fluxgate current sensor to supply power to the fluxgate current sensor;

[0010] The detection instrument is configured to be electrically connected to the fluxgate current sensor to measure the output of the fluxgate current sensor;

[0011] The switch is configured to be connected between the fluxgate current sensor and the first power supply, and between the fluxgate current sensor and the detection instrument, or it is configured to be connected between the fluxgate current sensor and the first power supply, and control multiple fluxgate current sensors to switch according to a preset time period by controlling its own conduction or shutdown.

[0012] In the case where the multi-sensor switching device also includes a second power supply:

[0013] The second power source is configured to be electrically connected to the first power source and supply power to the first power source;

[0014] The switch is configured to be connected between the first power source and the second power source, and by controlling its own conduction or deactivation, it controls multiple fluxgate current sensors to switch according to a preset time period.

[0015] In one possible design, the multi-sensor switching device includes: a first power supply, multiple fluxgate current sensors, a detection instrument, and multiple switches;

[0016] The first power supply includes a first input terminal, a second input terminal, a positive power output terminal, a negative power output terminal, and a ground terminal; the fluxgate current sensor includes a positive power input terminal, a negative power input terminal, a ground terminal, and a measuring terminal; the detection instrument includes a measuring terminal and a ground terminal.

[0017] The first input terminal and the second input terminal of the first power supply are used to connect to the power supply. The positive power output terminal of the first power supply is electrically connected to the positive power input terminal of each of the fluxgate current sensors. The negative power output terminal of the first power supply is electrically connected to the negative power input terminal of each of the fluxgate current sensors. The ground terminal of the first power supply is electrically connected to the ground terminal of each of the fluxgate current sensors.

[0018] The measuring terminal of the detection instrument is electrically connected to the measuring terminal of each fluxgate current sensor, and the grounding terminal of the detection instrument is electrically connected to the grounding terminal of each fluxgate current sensor.

[0019] A switch is provided between the positive power output terminal of the first power supply and the positive power input terminal of each fluxgate current sensor.

[0020] A switch is provided between the negative power output terminal of the first power supply and the negative power input terminal of each fluxgate current sensor.

[0021] The switch is provided between the measuring end of the detection instrument and the measuring end of each fluxgate current sensor.

[0022] In one possible design, the multi-sensor switching device includes: a first power supply, multiple fluxgate current sensors, multiple detection instruments, and multiple switches;

[0023] The first power supply includes a first input terminal, a second input terminal, a positive power output terminal, a negative power output terminal, and a ground terminal; the fluxgate current sensor includes a positive power input terminal, a negative power input terminal, a ground terminal, and a measuring terminal; the detection instrument includes a measuring terminal and a ground terminal.

[0024] The first input terminal and the second input terminal of the first power supply are used to connect to the power supply. The positive power output terminal of the first power supply is electrically connected to the positive power input terminal of each of the fluxgate current sensors. The negative power output terminal of the first power supply is electrically connected to the negative power input terminal of each of the fluxgate current sensors. The ground terminal of the first power supply is electrically connected to the ground terminal of each of the fluxgate current sensors.

[0025] For each of the fluxgate current sensors, the fluxgate current sensor is electrically connected to a detection instrument;

[0026] A switch is provided between the positive power output terminal of the first power supply and the positive power input terminal of each fluxgate current sensor.

[0027] A switch is provided between the negative power output terminal of the first power supply and the negative power input terminal of each fluxgate current sensor.

[0028] In one possible design, the multi-sensor switching device includes: a second power supply, multiple first power supplies, multiple fluxgate current sensors, multiple detection instruments, and multiple switches;

[0029] The second power supply includes a first output terminal and a second output terminal; the first power supply includes a first input terminal, a second input terminal, a positive power output terminal, a negative power output terminal, and a ground terminal; the fluxgate current sensor includes a positive power input terminal, a negative power input terminal, a ground terminal, and a measuring terminal; the detection instrument includes a measuring terminal and a ground terminal.

[0030] The first output terminal and the second output terminal of the second power supply are used to output power supply. The first output terminal of the second power supply is electrically connected to the first input terminal of each of the first power supplies. The second output terminal of the second power supply is electrically connected to the second input terminal of each of the first power supplies.

[0031] For each of the fluxgate current sensors, the fluxgate current sensor is electrically connected to a first power supply and a detection instrument respectively;

[0032] The switch is provided between the first output terminal of the second power supply and the first input terminal of each of the first power supplies.

[0033] Alternatively, the switch may be provided between the second output terminal of the second power supply and the second input terminal of each of the first power supplies.

[0034] In one possible design, the switch is a relay, a transistor, or an optocoupler.

[0035] In one possible design, the measuring instrument is a voltmeter.

[0036] In one possible design, the output quantity is either current or voltage.

[0037] In one possible design, the power supply is a 24V constant voltage power supply or a 220V AC power supply.

[0038] In one possible design, the preset duration ranges from 0.1 seconds to 100 seconds.

[0039] Secondly, this application provides a detection system, including: a multi-sensor switching device as described in the first aspect.

[0040] The beneficial effects of the embodiments of this application are as follows:

[0041] In this embodiment, by setting a switch between the fluxgate current sensor and the first power supply and the detection instrument, or by setting a switch between each first power supply and the second power supply when the multi-sensor switching device also includes a second power supply, the multiple fluxgate current sensors can be controlled to switch according to a preset time period by controlling the on or off of the switch, so that the multiple fluxgate current sensors can work in turn and reduce the problem of the disturbances of each fluxgate current sensor superimposed.

[0042] The beneficial effects provided in the second aspect and its various possible designs can be found in the first aspect and its various possible implementations, and will not be repeated here. Attached Figure Description

[0043] Figure 1 is a schematic diagram of a test scenario provided by related technologies;

[0044] Figure 2 is a schematic diagram of a multi-channel sensor switching device provided in an embodiment of this application;

[0045] Figure 3 is a schematic diagram of a multi-channel sensor switching device provided in Embodiment 1 of this application;

[0046] Figure 4 is a schematic diagram of a multi-channel sensor switching device provided in Embodiment 2 of this application;

[0047] Figure 5 is a schematic diagram of a multi-channel sensor switching device provided in Embodiment 3 of this application. Detailed Implementation

[0048] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c alone can mean: a alone, b alone, c alone, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] The terms “center,” “longitudinal,” “lateral,” “up,” “down,” “left,” “right,” “front,” and “rear,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] The terms "connected" and "connected" should be interpreted broadly. For example, in circuit structures, "connected" or "connected" can refer not only to physical connections but also to electrical or signal connections. This could be a direct connection (physical connection) or an indirect connection via at least one intermediate component, as long as the circuit is connected. It could also refer to the internal connection between two components. Similarly, a signal connection can refer to a connection via a circuit or a medium, such as radio waves. Those skilled in the art will understand the specific meaning of these terms in this application based on the specific circumstances.

[0051] Fluxgate current sensors, with their high measurement accuracy, can achieve precise measurement of minute currents. However, during the measurement process, the influence of the magnetic field can disturb the primary current of the fluxgate current sensor. Referring to Figure 1, which illustrates a test scenario provided by related technologies, when multiple current values ​​in a circuit need to be measured, multiple fluxgate current sensors need to operate simultaneously to detect multiple current values. However, when multiple fluxgate current sensors operate simultaneously, the disturbances from each sensor can overlap, leading to inconsistent test results.

[0052] To address the issue of overlapping disturbances from multiple fluxgate current sensors when measuring multiple current values ​​in relevant testing scenarios, this application provides a multi-channel sensor switching device 1000. Referring to Figure 2, which is a schematic diagram of the structure of such a device, the device 1000 includes at least one first power supply, multiple fluxgate current sensors, at least one detection instrument, and multiple switches.

[0053] The first power source is configured to be electrically connected to the fluxgate current sensor to supply power to the fluxgate current sensor.

[0054] The detection instrument is configured to be electrically connected to the fluxgate current sensor to measure the output of the fluxgate current sensor.

[0055] The switch is configured to connect between the fluxgate current sensor and the first power supply, and between the fluxgate current sensor and the detection instrument, or it is configured to connect between the fluxgate current sensor and the first power supply. By controlling its own conduction or shutdown, the switch controls multiple fluxgate current sensors to switch according to a preset time.

[0056] In the case where the multi-sensor switching device also includes a second power supply:

[0057] The second power source is configured to be electrically connected to the first power source and supply power to the first power source.

[0058] The switch is configured to connect between the first power supply and the second power supply, and by controlling its own conduction or cutoff, it controls multiple fluxgate current sensors to switch according to a preset time period.

[0059] Based on the working principle of fluxgate current sensors, it is known that they require a power supply to operate, for example, ±12V. After power is supplied, the fluxgate current sensor begins to work, outputting a voltage as a proportional value for the measured current. For example, a 1mA measured current can be output as a 100mV voltage (1mA corresponds to 100mV). By measuring the output voltage and using this proportional value, the current value of the measured current can be calculated.

[0060] The first power supply is electrically connected to the fluxgate current sensor and can provide power to the fluxgate current sensor, providing the power required by the fluxgate current sensor. For example, the first power supply outputs ±12V to provide ±12V power to the fluxgate current sensor, or the first power supply outputs ±15V to provide ±15V power to the fluxgate current sensor.

[0061] The detection instrument is electrically connected to the fluxgate current sensor to measure the output of the fluxgate current sensor. By measuring the output of the fluxgate current sensor, the current value of the current to be detected by the fluxgate current sensor can be deduced.

[0062] In this application, in order to solve the problem of the superposition of disturbances of each fluxgate current sensor when multiple fluxgate current sensors work simultaneously, a switch is set between the fluxgate current sensor and the first power supply and the detection instrument. By controlling the opening or closing of the switch, the multiple fluxgate current sensors are controlled to switch according to a preset time period, so that the multiple fluxgate current sensors can work in turn and reduce the problem of the superposition of disturbances of each fluxgate current sensor.

[0063] The preset duration can be set according to design needs, for example, the preset duration is 0.1s, or the preset duration is 100s. This application does not make specific limitations on this.

[0064] In a specific embodiment, referring to Figure 2, when the switch is configured to connect between the fluxgate current sensor and the first power supply, and also between the fluxgate current sensor and the detection instrument, the first power supply 1, fluxgate current sensor 1, and detection instrument 1 are considered as group 1 under test; the first power supply 2, fluxgate current sensor 2, and detection instrument 2 are considered as group 2 under test; and so on, the first power supply n, fluxgate current sensor n, and detection instrument n are considered as group n under test. By controlling the switches between fluxgate current sensor 1 and the first power supply 1 and detection instrument 1 in group 1 under test to be on, and controlling the switches between fluxgate current sensor 2 and the first power supply 2 and detection instrument 2 in group 2 under test to be off, controlling the switches between fluxgate current sensor 3 and the first power supply 3 and detection instrument 3 in group 3 under test to be off, and so on, controlling the switches between fluxgate current sensor n and the first power supply n and detection instrument n in group n under test to be off, the current value of group 1 under test is measured. That is, when measuring the current value of test group 1, the switches between fluxgate current sensor 1 and the first power supply 1 and the detection instrument 1 in test group 1 are all turned on, while the switches between fluxgate current sensors in the other test groups and the first power supply and the detection instrument are all turned off, thus realizing the measurement of the current value of test group 1. Similarly, when measuring the current value of test group n, the switches between fluxgate current sensor n and the first power supply n and the detection instrument n in test group n are all turned on, while the switches between fluxgate current sensors in the other test groups and the first power supply and the detection instrument are all turned off, thus realizing the measurement of the current value of test group n. The n fluxgate current sensors switch according to a preset time period, and after n times the preset time period, one round of fluxgate current sensor current measurement can be completed. For example, if the preset time period is 1 second, assuming there are 10 fluxgate current sensors, after 10 seconds, one round of fluxgate current sensor current measurement can be completed, and 10 current values ​​corresponding to the 10 fluxgate current sensors can be measured.

[0065] Referring to Figure 2, when the switch is set to connect between the fluxgate current sensor and the first power supply, no switch is needed between the fluxgate current sensor and the detection instrument. By controlling the on / off state of the fluxgate current sensor and the first power supply, multiple fluxgate current sensors can be controlled to switch according to a preset time interval. Specifically, by controlling the switch between fluxgate current sensor 1 and the first power supply 1 in test group 1 to be on, and controlling the switch between fluxgate current sensor 2 and the first power supply 2 in test group 2 to be off, controlling the switch between fluxgate current sensor 3 and the first power supply 3 in test group 3 to be off, ..., controlling the switch between fluxgate current sensor n and the first power supply n in test group n, the current value of test group 1 can be measured. That is, when measuring the current value of test group 1, the switch between fluxgate current sensor 1 and the first power supply 1 in test group 1 is turned on, and the switches between the fluxgate current sensors and the first power supply in the other test groups are turned off, thus achieving the measurement of the current value of test group 1. n fluxgate current sensors switch according to a preset time period. After n times the preset time period, one round of fluxgate current sensor current measurement can be completed.

[0066] In the case where the multi-sensor switching device also includes a second power supply, the second power supply can be electrically connected to the first power supply to provide power to the first power supply and supply the power required by the first power supply.

[0067] In the case where the multi-sensor switching device also includes a second power supply, a switch can be set between each first power supply and the second power supply. By controlling the opening or closing of the switch between each first power supply and the second power supply, multiple fluxgate current sensors can be switched according to a preset time period, so that multiple fluxgate current sensors can work independently in turn, reducing the problem of the mutual superposition of disturbances of each fluxgate current sensor.

[0068] In this embodiment, by setting a switch between the fluxgate current sensor and the first power supply and the detection instrument, or by setting a switch between each first power supply and the second power supply when the multi-sensor switching device also includes a second power supply, the multiple fluxgate current sensors can be controlled to switch according to a preset time period by controlling the on or off of the switch, so that the multiple fluxgate current sensors can work in turn and reduce the problem of the disturbances of each fluxgate current sensor superimposed.

[0069] In one possible embodiment, referring to FIG3, FIG3 is a multi-channel sensor switching device 1000 provided in Embodiment 1 of this application. As shown in FIG3, the multi-channel sensor switching device 1000 may include: a first power supply, multiple fluxgate current sensors, a detection instrument, and multiple switches.

[0070] The first power supply includes a first input terminal IN1, a second input terminal IN2, a positive power output terminal P1, a negative power output terminal P2, and a ground terminal G; the fluxgate current sensor includes a positive power input terminal Sn1, a negative power input terminal Sn2, a ground terminal Gn, and a measuring terminal SnM; the detection instrument includes a measuring terminal M and a ground terminal GM.

[0071] The first input terminal IN1 and the second input terminal IN2 of the first power supply are used to connect to the power supply. The positive power output terminal P1 of the first power supply is electrically connected to the positive power input terminal Sn1 of each fluxgate current sensor. The negative power output terminal P2 of the first power supply is electrically connected to the negative power input terminal Sn2 of each fluxgate current sensor. The ground terminal G of the first power supply is electrically connected to the ground terminal Gn of each fluxgate current sensor.

[0072] The measuring terminal M of the detection instrument is electrically connected to the measuring terminal SnM of each fluxgate current sensor, and the grounding terminal GM of the detection instrument is electrically connected to the grounding terminal Gn of each fluxgate current sensor.

[0073] A switch is provided between the positive power output terminal P1 of the first power supply and the positive power input terminal Sn1 of each fluxgate current sensor.

[0074] A switch is provided between the negative power output terminal P2 of the first power supply and the negative power input terminal Sn2 of each fluxgate current sensor.

[0075] A switch is installed between the measuring terminal M of the detection instrument and the measuring terminal SnM of each fluxgate current sensor.

[0076] Referring to Figure 3, in Embodiment 1, a circuit includes multiple fluxgate current sensors, namely fluxgate current sensor 1, fluxgate current sensor 2, ..., fluxgate current sensor n. n current values ​​can be obtained from the n fluxgate current sensors. It also includes a first power supply to power the multiple fluxgate current sensors and a measuring instrument to measure the output of the multiple fluxgate current sensors. Referring to Figure 3, the first power supply includes a first input terminal IN1 and a second input terminal IN2. The first power supply performs level conversion on the power supply to obtain the power required by the fluxgate current sensors, and supplies power to the fluxgate current sensors through the positive power output terminal P1, the negative power output terminal P2, and the ground terminal G. For example, when the first power supply output is ±15V, the voltage between the positive power output terminal P1 and the ground terminal G is +15V, and the voltage between the negative power output terminal P2 and the ground terminal G is -15V. The fluxgate current sensor includes a positive power input terminal Sn1, a negative power input terminal Sn2, a ground terminal Gn, and a measuring terminal SnM. The testing instrument includes a measuring terminal M and a grounding terminal GM.

[0077] The positive power output terminal P1 of the first power supply is electrically connected to the positive power input terminal Sn1 of each fluxgate current sensor, the negative power output terminal P2 of the first power supply is electrically connected to the negative power input terminal Sn2 of each fluxgate current sensor, and the ground terminal G of the first power supply is electrically connected to the ground terminal Gn of each fluxgate current sensor. This allows multiple fluxgate current sensors to be powered by one first power supply.

[0078] By electrically connecting the measuring terminal M of the detection instrument to the measuring terminal SnM of each fluxgate current sensor, and the grounding terminal GM of the detection instrument to the grounding terminal Gn of each fluxgate current sensor, the output of multiple fluxgate current sensors can be measured by one detection instrument.

[0079] Referring to Figure 3, for each fluxgate current sensor, the power supply section includes a positive power input terminal Sn1, a negative power input terminal Sn2, and a ground terminal Gn, while the measurement section includes a measurement terminal SnM and a ground terminal Gn. Switches are installed at the positive power input terminals Sn1 and Sn2 of the power supply section and at the measurement terminal SnM of the measurement section. By controlling the on / off state of these switches, a single fluxgate current sensor can operate independently, measuring its output. Therefore, switches are required between the positive power output terminal P1 of the first power supply and the positive power input terminal Sn1 of each fluxgate current sensor; between the negative power output terminal P2 of the first power supply and the negative power input terminal Sn2 of each fluxgate current sensor; and between the measurement terminal M of the detection instrument and the measurement terminal SnM of each fluxgate current sensor. The switches between the positive power input terminal Sn1 of each fluxgate current sensor and the positive power output terminal P1 of the first power supply, the switches between the negative power input terminal Sn2 and the negative power output terminal P2 of the first power supply, and the switches between the measuring terminal SnM and the measuring terminal M of the detection instrument can be regarded as a set of switches (i.e., Kn1, Kn2, Kn3 in Figure 3). By controlling the state of each set of switches (i.e., Kn1, Kn2, Kn3 in Figure 3), multiple fluxgate current sensors can work independently in turn, reducing the problem of the mutual superposition of disturbances of each fluxgate current sensor.

[0080] Specifically, referring to Figure 3, an example is given using a first power supply, seven fluxgate current sensors, a detection instrument, and multiple switches. When measuring the current value of fluxgate current sensor 1, the switches between fluxgate current sensor 1 and the first power supply and the detection instrument are all turned on, i.e., switches K11, K12, and K13 are turned on, while the switches between the remaining fluxgate current sensors and the first power supply and the detection instrument are turned off. This achieves the measurement of the current value of fluxgate current sensor 1, obtaining the output of fluxgate current sensor 1; preset duration. Then, for example, if the preset duration is 1 second, after 1 second, the switches between the fluxgate current sensor 2 and the first power supply and the detection instrument are all turned on, that is, the switches K21, K22 and K23 are turned on, and the switches between the remaining fluxgate current sensors and the first power supply and the detection instrument are all turned off, so as to realize the measurement of the current value of the fluxgate current sensor 2 and obtain the output of the fluxgate current sensor 2; and so on, after 7 seconds, the output of one round of fluxgate current sensor measurement can be completed, and the output of 7 fluxgate current sensors can be obtained.

[0081] In one possible embodiment, referring to FIG4, a multi-channel sensor switching device 1000 provided in Embodiment 2 of this application is shown. As shown in FIG4, the multi-channel sensor switching device may include: a first power supply, multiple fluxgate current sensors, multiple detection instruments, and multiple switches.

[0082] The first power supply includes a first input terminal IN1, a second input terminal IN2, a positive power output terminal P1, a negative power output terminal P2, and a ground terminal G; the fluxgate current sensor includes a positive power input terminal Sn1, a negative power input terminal Sn2, a ground terminal Gn, and a measuring terminal SnM; the detection instrument includes a measuring terminal M and a ground terminal GM.

[0083] The first input terminal IN1 and the second input terminal IN2 of the first power supply are used to connect to the power supply. The positive power output terminal P1 of the first power supply is electrically connected to the positive power input terminal Sn1 of each fluxgate current sensor. The negative power output terminal P2 of the first power supply is electrically connected to the negative power input terminal Sn2 of each fluxgate current sensor. The ground terminal G of the first power supply is electrically connected to the ground terminal Gn of each fluxgate current sensor.

[0084] For each fluxgate current sensor, the fluxgate current sensor is electrically connected to a detection instrument.

[0085] A switch is provided between the positive power output terminal P1 of the first power supply and the positive power input terminal Sn1 of each fluxgate current sensor.

[0086] A switch is provided between the negative power output terminal P2 of the first power supply and the negative power input terminal Sn2 of each fluxgate current sensor.

[0087] The working principle of Embodiment 2 of this application is the same as that of Embodiment 1, and will not be repeated here. The difference is that the switch in Embodiment 2 is only set to be connected between the fluxgate current sensor and the first power supply. At this time, there is no need to set a switch between the fluxgate current sensor and the detection instrument. By controlling the conduction or cutoff between the fluxgate current sensor and the first power supply, multiple fluxgate current sensors can be controlled to switch according to a preset time.

[0088] Specifically, referring to Figure 4, the current value of the test group 1 is measured by controlling the switches (i.e., switches K11 and K12) between the fluxgate current sensor 1 and the first power supply 1 in test group 1 to be turned on, and controlling the switches (i.e., switches K21 and K22) between the fluxgate current sensor 2 and the first power supply 2 in test group 2 to be turned off, controlling the switches (i.e., switches K31 and K32) between the fluxgate current sensor 3 and the first power supply 3 in test group 3 to be turned off, and so on, until the switches (i.e., switches Kn1 and Kn2) between the fluxgate current sensor n and the first power supply n in test group n are turned off. That is, when measuring the current value of test group 1, the switch between the fluxgate current sensor 1 and the first power supply 1 in test group 1 is turned on, and the switches between the fluxgate current sensors and the first power supply in the other test groups are turned off, thus achieving the measurement of the current value of test group 1. n fluxgate current sensors switch according to a preset time period. After n times the preset time period, one round of fluxgate current sensor current measurement can be completed.

[0089] In one possible embodiment, referring to FIG5, FIG5 is a multi-channel sensor switching device 1000 provided in Embodiment 3 of this application. As shown in FIG5, the multi-channel sensor switching device 1000 may include: a second power supply, multiple first power supplies, multiple fluxgate current sensors, multiple detection instruments, and multiple switches.

[0090] The second power supply includes a first output terminal SP1 and a second output terminal SP2; the first power supply includes a first input terminal INn1, a second input terminal INn2, a positive power output terminal Pn1, a negative power output terminal Pn2, and a ground terminal PGn; the fluxgate current sensor includes a positive power input terminal Sn1, a negative power input terminal Sn2, a ground terminal Gn, and a measuring terminal SnM; the detection instrument includes a measuring terminal Mn and a ground terminal GMn.

[0091] The first output terminal SP1 and the second output terminal SP2 of the second power supply are used to output power. The first output terminal SP1 of the second power supply is electrically connected to the first input terminal INn1 of each of the first power supplies, and the second output terminal SP2 of the second power supply is electrically connected to the second input terminal INn2 of each of the first power supplies.

[0092] For each fluxgate current sensor, the fluxgate current sensor is electrically connected to a first power supply and a detection instrument.

[0093] A switch is provided between the first output terminal SP1 of the second power supply and the first input terminal INn1 of each first power supply.

[0094] Alternatively, a switch may be provided between the second output terminal SP2 of the second power supply and the second input terminal INn2 of each of the first power supplies.

[0095] Referring to Figure 5, in Embodiment 3, a circuit includes multiple fluxgate current sensors, namely fluxgate current sensor 1, fluxgate current sensor 2, ..., fluxgate current sensor n. n current values ​​can be obtained from the n fluxgate current sensors. The circuit also includes multiple first power supplies and multiple detection instruments. For each fluxgate current sensor, each fluxgate current sensor is electrically connected to a first power supply and a detection instrument. The first power supply powers the fluxgate current sensor electrically connected to it, and the detection instrument measures the output of the connected fluxgate current sensor. Additionally, a second power supply powers each of the first power supplies. This embodiment of the application can measure the output of multiple fluxgate current sensors.

[0096] In this embodiment, the first output terminal SP1 and the second output terminal SP2 of the second power supply are used to output power supply. The power supply output by the second power supply supplies power to the first power supply. The first power supply performs level conversion on the power supply to provide the required power to each fluxgate current sensor.

[0097] For each fluxgate current sensor, the fluxgate current sensor is electrically connected to a first power supply and a detection instrument. Specifically, as shown in Figure 5, the positive power input terminal S11 of fluxgate current sensor 1 is electrically connected to the positive power output terminal P11 of the first power supply 1, the negative power input terminal S12 of fluxgate current sensor 1 is electrically connected to the negative power output terminal P12 of the first power supply 1, the measuring terminal S1M of fluxgate current sensor 1 is electrically connected to the measuring terminal M1 of detection instrument 1, and the ground terminal G1 of fluxgate current sensor 1 is electrically connected to the ground terminal PG1 of the first power supply 1 and the ground terminal GM1 of detection instrument 1. The positive power input terminal S21 of fluxgate current sensor 2 is electrically connected to the positive power output terminal P21 of the first power supply 2, and the negative power input terminal S1M of fluxgate current sensor 2 is electrically connected to the ground terminal S1M of detection instrument 1. 22 is electrically connected to the negative power output terminal P22 of the first power supply 2. The measuring terminal S2M of the fluxgate current sensor 2 is electrically connected to the measuring terminal M2 of the detection instrument 2. The grounding terminal G2 of the fluxgate current sensor 2 is electrically connected to the grounding terminal PG2 of the first power supply 2 and the grounding terminal GM2 of the detection instrument 2, respectively. Similarly, the positive power input terminal Sn1 of the fluxgate current sensor n is electrically connected to the positive power output terminal Pn1 of the first power supply n. The negative power input terminal Sn2 of the fluxgate current sensor n is electrically connected to the negative power output terminal Pn2 of the first power supply n. The measuring terminal SnM of the fluxgate current sensor n is electrically connected to the measuring terminal Mn of the detection instrument n. The grounding terminal Gn of the fluxgate current sensor n is electrically connected to the grounding terminal PGn of the first power supply n and the grounding terminal GMn of the detection instrument n, respectively.

[0098] In this embodiment of the application, switches (i.e., K11, K21, ..., Kn1) are provided between the first output terminal SP1 of the second power supply and the first input terminals INn1 (i.e., IN11, IN21, ..., INn1) of each first power supply. By controlling the state of each set of switches, multiple fluxgate current sensors can work independently in turn, reducing the problem of the mutual superposition of disturbances of each fluxgate current sensor.

[0099] Alternatively, switches (K12, K22, ..., Kn2) can be installed between the second output terminal SP2 of the second power supply and the second input terminals INn2 of each first power supply (i.e., IN12, IN22, ..., INn2). By controlling the state of each set of switches, multiple fluxgate current sensors can work independently in turn, reducing the problem of the disturbances of each fluxgate current sensor being superimposed.

[0100] In this embodiment, by setting a switch between the first output terminal SP1 of the second power supply and the first input terminal INn1 of each first power supply, the power supply from the second power supply to the first power supply can be disconnected. Alternatively, by setting a switch between the second output terminal SP2 of the second power supply and the second input terminal INn2 of each first power supply, the power supply from the second power supply to the first power supply can also be disconnected, thereby controlling multiple fluxgate current sensors to work independently in turn.

[0101] Specifically, referring to Figure 5, the following example illustrates the system with one second power supply, three first power supplies, three fluxgate current sensors, three detection instruments, and multiple switches: With switches (K11, K21, and K31) installed between the first output terminal SP1 of the second power supply and the first input terminals INn1 (i.e., IN11, IN21, and IN31) of the three first power supplies, when measuring the current value of fluxgate current sensor 1, the switch between the first power supply 1 and the second power supply is turned on (i.e., switch K11 is turned on), while the switches between the remaining first power supplies and the second power supplies are turned off (i.e., switches K21 and K31 are turned off). This allows for the measurement of the current value of fluxgate current sensor 1, obtaining its output. After a preset time, for example, a preset time of 1... If 1 second passes, the switch between the first power supply 2 and the second power supply is turned on, i.e., switch K21 is turned on, and the switches between the other first power supplies and the second power supplies are turned off, i.e., switches K11 and K31 are turned off, thus measuring the current value of the fluxgate current sensor 2 and obtaining its output. If 1 second passes, the switch between the first power supply 3 and the second power supply is turned on, i.e., switch K31 is turned on, and the switches between the other first power supplies and the second power supplies are turned off, i.e., switches K11 and K21 are turned off, thus measuring the current value of the fluxgate current sensor 3 and obtaining its output. If 3 seconds pass, the output of the fluxgate current sensor is measured once, thus obtaining the output of the three fluxgate current sensors.

[0102] Specifically, referring to Figure 5, the example still uses one second power supply, three first power supplies, three fluxgate current sensors, three detection instruments, and multiple switches: With switches (K12, K22, K32) installed between the second output terminal SP2 of the second power supply and the second input terminals INn2 (i.e., IN12, IN22, IN32) of the three first power supplies, when measuring the current value of fluxgate current sensor 1, the switch between the first power supply 1 and the second power supply is turned on (i.e., switch K12 is turned on), and the switches between the remaining first power supplies and the second power supplies are turned on (i.e., switches K22 and K32 are turned off), thus measuring the current value of fluxgate current sensor 1 and obtaining its output. After a preset time, for example, a preset time of... After 1 second, the switch between the first power supply 2 and the second power supply is turned on, i.e., switch K22 is turned on, and the switches between the other first power supplies and the second power supplies are turned off, i.e., switches K12 and K32 are turned off, so as to measure the current value of the fluxgate current sensor 2 and obtain the output of the fluxgate current sensor 2. After 1 second, the switch between the first power supply 3 and the second power supply is turned on, i.e., switch K32 is turned on, and the switches between the other first power supplies and the second power supplies are turned off, i.e., switches K12 and K22 are turned off, so as to measure the current value of the fluxgate current sensor 3 and obtain the output of the fluxgate current sensor 3. After 3 seconds, the output of the fluxgate current sensor can be measured in one round, and the output of the three fluxgate current sensors can be obtained.

[0103] In this embodiment, by setting a switch between the first output terminal of the second power supply and the first input terminals of each first power supply, the power supply from the second power supply to the first power supply can be disconnected. Alternatively, by setting a switch between the second output terminal of the second power supply and the second input terminals of each first power supply, the power supply from the second power supply to the first power supply can also be disconnected. This allows multiple fluxgate current sensors to work independently in turn, reducing the problem of the disturbances of each fluxgate current sensor being superimposed.

[0104] In one possible embodiment, the switch can be a relay, a transistor, or an optocoupler.

[0105] The relays in the embodiments of this application can be single-channel relays or multi-channel relays, and this application does not make any specific limitation on them.

[0106] The transistors in this application can be bipolar transistors or field-effect transistors, and this application does not specifically limit them.

[0107] This application can also use an optocoupler as a switch. This application does not specify the type of optocoupler.

[0108] In one possible embodiment, the measuring instrument can be a voltmeter.

[0109] The output of the fluxgate current sensor is measured using a voltmeter.

[0110] In one possible embodiment, the output quantity is either current or voltage.

[0111] In one possible embodiment, the power supply is a 24V constant voltage power supply or a 220V AC power supply.

[0112] The first output terminal SP1 and the second output terminal SP2 of the second power supply are used to output power. When the second power supply is a 24V constant voltage power supply, the output power supply is a 24V constant voltage power supply. The first power supply performs level conversion on the 24V constant voltage power supply to provide the power required by each fluxgate current sensor. For example, when the fluxgate current sensor requires ±15V, the first power supply performs level conversion on the 24V constant voltage power supply output by the second power supply to convert it to ±15V required by the fluxgate current sensor.

[0113] When the power supply output of the second power source is 220V AC, the first power source performs level conversion on the 220V AC to provide the required power to each fluxgate current sensor. For example, when the fluxgate current sensor requires ±15V, the first power source performs level conversion on the 220V AC to convert it to ±15V required by the fluxgate current sensor.

[0114] In one possible embodiment, the preset duration ranges from 0.1 seconds to 100 seconds.

[0115] Users can choose a suitable preset duration value according to their actual needs.

[0116] This application also provides a detection system, including: the multi-sensor switching device as described above.

[0117] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A multi-channel sensor switching device, characterized in that, In the case where the multi-sensor switching device includes: at least one first power supply, multiple fluxgate current sensors, at least one detection instrument, and multiple switches: The first power supply is configured to be electrically connected to the fluxgate current sensor to supply power to the fluxgate current sensor; The detection instrument is configured to be electrically connected to the fluxgate current sensor to measure the output of the fluxgate current sensor; The switch is configured to be connected between the fluxgate current sensor and the first power supply, and between the fluxgate current sensor and the detection instrument, or it is configured to be connected between the fluxgate current sensor and the first power supply, and control multiple fluxgate current sensors to switch according to a preset time period by controlling its own conduction or shutdown. In the case where the multi-sensor switching device also includes a second power supply: The second power source is configured to be electrically connected to the first power source and supply power to the first power source; The switch is configured to be connected between the first power source and the second power source, and by controlling its own conduction or deactivation, it controls multiple fluxgate current sensors to switch according to a preset time period.

2. The multi-channel sensor switching device according to claim 1, characterized in that, The multi-channel sensor switching device includes: a first power supply, multiple fluxgate current sensors, a detection instrument, and multiple switches; The first power supply includes a first input terminal, a second input terminal, a positive power output terminal, a negative power output terminal, and a ground terminal; the fluxgate current sensor includes a positive power input terminal, a negative power input terminal, a ground terminal, and a measuring terminal; the detection instrument includes a measuring terminal and a ground terminal. The first input terminal and the second input terminal of the first power supply are used to connect to the power supply. The positive power output terminal of the first power supply is electrically connected to the positive power input terminal of each of the fluxgate current sensors. The negative power output terminal of the first power supply is electrically connected to the negative power input terminal of each of the fluxgate current sensors. The ground terminal of the first power supply is electrically connected to the ground terminal of each of the fluxgate current sensors. The measuring terminal of the detection instrument is electrically connected to the measuring terminal of each fluxgate current sensor, and the grounding terminal of the detection instrument is electrically connected to the grounding terminal of each fluxgate current sensor. A switch is provided between the positive power output terminal of the first power supply and the positive power input terminal of each fluxgate current sensor. A switch is provided between the negative power output terminal of the first power supply and the negative power input terminal of each fluxgate current sensor. The switch is provided between the measuring end of the detection instrument and the measuring end of each fluxgate current sensor.

3. The multi-channel sensor switching device according to claim 1, characterized in that, The multi-channel sensor switching device includes: a first power supply, multiple fluxgate current sensors, multiple detection instruments, and multiple switches; The first power supply includes a first input terminal, a second input terminal, a positive power output terminal, a negative power output terminal, and a ground terminal; the fluxgate current sensor includes a positive power input terminal, a negative power input terminal, a ground terminal, and a measuring terminal; the detection instrument includes a measuring terminal and a ground terminal. The first input terminal and the second input terminal of the first power supply are used to connect to the power supply. The positive power output terminal of the first power supply is electrically connected to the positive power input terminal of each of the fluxgate current sensors. The negative power output terminal of the first power supply is electrically connected to the negative power input terminal of each of the fluxgate current sensors. The ground terminal of the first power supply is electrically connected to the ground terminal of each of the fluxgate current sensors. For each of the fluxgate current sensors, the fluxgate current sensor is electrically connected to a detection instrument; A switch is provided between the positive power output terminal of the first power supply and the positive power input terminal of each fluxgate current sensor. A switch is provided between the negative power output terminal of the first power supply and the negative power input terminal of each fluxgate current sensor.

4. The multi-channel sensor switching device according to claim 1, characterized in that, The multi-channel sensor switching device includes: a second power supply, multiple first power supplies, multiple fluxgate current sensors, multiple detection instruments, and multiple switches; The second power supply includes a first output terminal and a second output terminal; the first power supply includes a first input terminal, a second input terminal, a positive power output terminal, a negative power output terminal, and a ground terminal; the fluxgate current sensor includes a positive power input terminal, a negative power input terminal, a ground terminal, and a measuring terminal; the detection instrument includes a measuring terminal and a ground terminal. The first output terminal and the second output terminal of the second power supply are used to output power supply. The first output terminal of the second power supply is electrically connected to the first input terminal of each of the first power supplies. The second output terminal of the second power supply is electrically connected to the second input terminal of each of the first power supplies. For each of the fluxgate current sensors, the fluxgate current sensor is electrically connected to a first power supply and a detection instrument respectively; The switch is provided between the first output terminal of the second power supply and the first input terminal of each of the first power supplies. Alternatively, the switch may be provided between the second output terminal of the second power supply and the second input terminal of each of the first power supplies.

5. The multi-channel sensor switching device according to claim 1, characterized in that, The switch is a relay, a transistor, or an optocoupler.

6. The multi-channel sensor switching device according to claim 1, characterized in that, The testing instrument is a voltmeter.

7. The multi-channel sensor switching device according to claim 1, characterized in that, The output quantity is either current or voltage.

8. The multi-channel sensor switching device according to any one of claims 2-4, characterized in that, The power supply is a 24V constant voltage power supply or a 220V AC power supply.

9. The multi-channel sensor switching device according to claim 1, characterized in that, The preset duration ranges from 0.1 seconds to 100 seconds.

10. A detection system, characterized in that, include: The multi-sensor switching device as described in any one of claims 1-9.

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