Hall current sensor detection device

Abstract

The utility model discloses a Hall current sensor detection device, which relates to the field of detection and comprises a reference voltage module used for acquiring reference voltage and outputting the reference voltage to an adjustable voltage module; the adjustable voltage module is used for outputting adjustable stable voltage to the constant current module; the constant current module is used for fixing the output current of the access equipment based on the magnitude of the input stable voltage; the current detection module is used for detecting the magnitude of the output current of the Hall current sensor; compared with the prior art, the constant current measuring circuit has the advantages that the constant current in the constant current module is adjusted through the adjustable voltage module, the current measuring requirements in different ranges can be met, the adjustable current value is achieved, the measuring precision is high, and the measuring precision is high. The current range from 1 ampere to dozens of amperes can be covered; and the performance and quality of the Hall current sensor can be effectively evaluated.

Description

Technical Field

[0001] The utility model relates to the field of detection, in particular to a Hall current sensor detection device. Background Art

[0002] A Hall-effect current sensor is a commonly used current sensing device that operates based on the Hall effect principle. The Hall effect states that when a current-carrying wire is placed in a perpendicular magnetic field, the voltage across the wire is proportional to the current. Using this principle, Hall-effect current sensors can measure the current flowing through a wire.

[0003] The existing Hall current sensor detection device has a small detection current range, which is difficult to meet the use requirements and needs to be improved. Utility Model Content

[0004] The purpose of the present utility model is to provide a Hall current sensor detection device to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A Hall current sensor detection device, comprising:

[0007] A reference voltage module is used to obtain a reference voltage and output it to the adjustable voltage module;

[0008] The adjustable voltage module is used to output an adjustable stable voltage to the constant current module;

[0009] The constant current module is used to stabilize the output current of the connected device based on the input voltage;

[0010] Current detection module, used to detect the output current of the Hall current sensor;

[0011] The reference voltage module is connected to the adjustable voltage module, the adjustable voltage module is connected to the constant current module, and the constant current module is connected to the current detection module.

[0012] As a further solution of the present invention: the reference voltage module includes a resistor R1, a voltage regulator TL431, a potentiometer R2, a resistor R5, and a capacitor C5. One end of the resistor R1 is connected to a 12V voltage, and the other end of the resistor R1 is connected to the negative pole of the voltage regulator TL431, one end of the potentiometer R2, and one end of the capacitor C5. The reference pole of the voltage regulator TL431 is connected to the other end of the potentiometer R2 and one end of the resistor R5. The positive pole of the voltage regulator TL431 is connected to the other end of the resistor R5, the other end of the capacitor C5, and the common ground.

[0013] As a further solution of the present utility model: the adjustable voltage module includes an adjustable potentiometer U2, the model of the adjustable potentiometer U2 is X9511, pin 1 of the adjustable potentiometer U2 is grounded through switch K1, pin 2 of the adjustable potentiometer U2 is grounded through switch K2, pin 3 of the adjustable potentiometer U2 is connected to the reference voltage module through resistor R9, pin 4 of the adjustable potentiometer U2 is grounded, pin 5 of the adjustable potentiometer U2 is connected to the constant current module, pin 6 of the adjustable potentiometer U2 is grounded, pin 7 of the adjustable potentiometer U2 is grounded through resistor R12, pin 8 of the adjustable potentiometer U2 is connected to the cathode of diode D2, and the positive pole of diode D2 is connected to the reference voltage module.

[0014] As a further solution of the present utility model: the constant current module includes an amplifier U1A, a MOS tube Q1, and a resistor R7. The non-inverting end of the amplifier U1A is connected to the adjustable voltage module through the resistor R3. The inverting end of the amplifier U1A is connected to one end of the capacitor C4, the output end of the amplifier U1B, and one end of the resistor R11. The output end of the amplifier U1A is connected to the other end of the capacitor C4 and one end of the resistor R4. The other end of the resistor R4 is connected to the G pole of the MOS tube Q1. The D pole of the MOS tube Q1 is connected to the current source through the interface J1. The S pole of the MOS tube Q1 is connected to one end of the resistor R7 and one end of the resistor R6. The other end of the resistor R7 is grounded. The other end of the resistor R6 is connected to the non-inverting end of the amplifier U1B. The inverting end of the amplifier U1B is connected to the other end of the resistor R11 and one end of the resistor R10. The other end of the resistor R10 is grounded.

[0015] As a further solution of the present utility model: the current detection module includes an interface J4, the interface J4 is externally connected to a Hall current sensor, the first end of the interface J4 is connected to a +24V voltage, the second end of the interface J4 is connected to one end of the resistor R13, the third end of the interface J4 is connected to the O-end of the voltage and ammeter M7, the other end of the resistor R13 is connected to the O-end of the voltage and ammeter M6, the I+, V, and O+ ends of the voltage and ammeter M6 are connected to the +24V voltage, the I-end of the voltage and ammeter M6 is grounded, the I+, V, and O+ ends of the voltage and ammeter M7 are grounded, and the I-end of the voltage and ammeter M6 is connected to a -24V voltage.

[0016] Compared with the existing technology, the beneficial effects of the present invention are: the present invention adjusts the constant current size in the constant current module through the adjustable voltage module, can adapt to current measurement requirements in different ranges, has an adjustable current value, and can cover the current range from 1 ampere to tens of amperes; it can effectively evaluate the performance and quality of the Hall current sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the circuit diagram of the reference voltage module, adjustable voltage module and constant current module.

[0018] Figure 2 This is the circuit diagram of the current detection module. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] See also Figure 1 , a Hall current sensor detection device, comprising:

[0021] A reference voltage module is used to obtain a reference voltage and output it to the adjustable voltage module;

[0022] The adjustable voltage module is used to output an adjustable stable voltage to the constant current module;

[0023] The constant current module is used to stabilize the output current of the connected device based on the input voltage;

[0024] Current detection module, used to detect the output current of the Hall current sensor;

[0025] The reference voltage module is connected to the adjustable voltage module, the adjustable voltage module is connected to the constant current module, and the constant current module is connected to the current detection module.

[0026] In this example: See Figure 1 The reference voltage module includes a resistor R1, a voltage regulator TL431, a potentiometer R2, a resistor R5, and a capacitor C5. One end of the resistor R1 is connected to a 12V voltage, and the other end of the resistor R1 is connected to the negative electrode of the voltage regulator TL431, one end of the potentiometer R2, and one end of the capacitor C5. The reference electrode of the voltage regulator TL431 is connected to the other end of the potentiometer R2 and one end of the resistor R5. The positive electrode of the voltage regulator TL431 is connected to the other end of the resistor R5, the other end of the capacitor C5, and the common ground.

[0027] The voltage regulator TL431 is used as a controllable precision voltage regulator to provide a 2.5V voltage regulator and output it to the adjustable voltage module.

[0028] In this example: See Figure 1The adjustable voltage module includes an adjustable potentiometer U2. The model of the adjustable potentiometer U2 is X9511. Pin 1 of the adjustable potentiometer U2 is grounded through the switch K1, pin 2 of the adjustable potentiometer U2 is grounded through the switch K2, pin 3 of the adjustable potentiometer U2 is connected to the reference voltage module through the resistor R9, pin 4 of the adjustable potentiometer U2 is grounded, pin 5 of the adjustable potentiometer U2 is connected to the constant current module, pin 6 of the adjustable potentiometer U2 is grounded, pin 7 of the adjustable potentiometer U2 is grounded through the resistor R12, pin 8 of the adjustable potentiometer U2 is connected to the cathode of the diode D2, and the anode of the diode D2 is connected to the reference voltage module.

[0029] In the X9511, VH and VL (pins 3 and 6) are the high and low voltage terminals, which are equivalent to the fixed terminals of a mechanical potentiometer. VW (pin 5) is the sliding terminal, which is equivalent to the movable terminal of a mechanical potentiometer. The series resistance of the sliding terminal (the on-resistance of the electronic switch) is typically 40 Ω.

[0030] PU (pin 1): Count-up input with debounce functionality and an internal pull-up resistor, which normally maintains the PU pin at a high level. When the PU pin input is low, the internal counter begins counting up, the sliding output moves upward, the resistance between VL and VW increases, and the resistance between VH and VW decreases. Because of the internal debounce functionality, the input must remain low for at least 40ms to be effective. If the input remains low for longer than 40ms but less than 1s, the counter counts in slow mode, incrementing by 1 every 250ms. If the input remains low for longer than 1s, the counter counts in fast mode, incrementing by 1 every 50ms, for a time period exceeding 1s.

[0031] PD (pin 2): Downcount input. Like the PU input, this pin has a debounce function and an internal pull-up resistor, which normally maintains the PD pin at a high level. When the PD input is low, the internal counter begins to count down, and the sliding output moves downward, decreasing the resistance between VL and VW and increasing the resistance between VH and VW. The characteristics of the slow and fast counting modes are exactly the same as those of the PU input.

[0032] ASE (pin 7): Automatic Store Enable. This pin also has an internal debounce function. If the input voltage remains low from power-up, when the chip's internal circuitry detects a drop to 4V, it automatically stores the counter value (the position of the wiper) in the E²PROM memory. This storage period takes at least 2ms and must be completed before the voltage drops to 3.5V. The memory contents are recalled when power is restored. If the ASE pin remains high, the automatic store function is not executed. Only when the voltage is pulled low and then restored to a high level will the rising edge of the voltage cause the store instruction to be executed. If the ASE pin is held high at power-up and then pulled low, the wiper will not respond to the PU and PD inputs until ASE is pulled high again and remains high. VCC, VSS: Power inputs.

[0033] X9511 divides the input net 2.5V reference voltage and outputs it to the constant current module. The voltage output to the constant current module is adjustable.

[0034] In this example: See Figure 1 The constant current module includes an amplifier U1A, a MOS transistor Q1, and a resistor R7. The non-inverting terminal of the amplifier U1A is connected to the adjustable voltage module through the resistor R3. The inverting terminal of the amplifier U1A is connected to one end of the capacitor C4, the output terminal of the amplifier U1B, and one end of the resistor R11. The output terminal of the amplifier U1A is connected to the other end of the capacitor C4 and one end of the resistor R4. The other end of the resistor R4 is connected to the G terminal of the MOS transistor Q1. The D terminal of the MOS transistor Q1 is connected to the current source through the interface J1. The S terminal of the MOS transistor Q1 is connected to one end of the resistor R7 and one end of the resistor R6. The other end of the resistor R7 is grounded. The other end of the resistor R6 is connected to the non-inverting terminal of the amplifier U1B. The inverting terminal of the amplifier U1B is connected to the other end of the resistor R11 and one end of the resistor R10. The other end of the resistor R10 is grounded.

[0035] Initially, the non-inverting terminal of amplifier U1A is at a constant voltage, and the inverting terminal has no voltage. Amplifier U1A outputs a high level, driving MOS tube Q1 to turn on. Current flows through resistor R7, and voltage exists. After being amplified by amplifier U1B, it is fed back to the inverting terminal of amplifier U1A. When the flowing current is relatively large, the voltage of the inverting terminal of amplifier U1A is higher than the voltage of the non-inverting terminal, which reduces the conduction degree of MOS tube Q1. Similarly, when the current flowing through resistor R7 is relatively small, the voltage of the non-inverting terminal of amplifier U1A is higher than the voltage of the inverting terminal, increasing the output and deepening the conduction degree of MOS tube Q1, thereby changing the current flowing through resistor R7. Finally, the voltages of the non-inverting and inverting terminals of amplifier U1A are the same, and the current flowing through resistor R7 is constant, so that the output current through interface J1 is determined.

[0036] In this example: See Figure 2The current detection module includes an interface J4, which is externally connected to a Hall current sensor. The first end of the interface J4 is connected to a +24V voltage, the second end of the interface J4 is connected to one end of the resistor R13, the third end of the interface J4 is connected to the O-end of the voltage and ammeter M7, the other end of the resistor R13 is connected to the O-end of the voltage and ammeter M6, the I+, V, and O+ ends of the voltage and ammeter M6 are connected to a +24V voltage, the I-end of the voltage and ammeter M6 is grounded, the I+, V, and O+ ends of the voltage and ammeter M7 are grounded, and the I-end of the voltage and ammeter M6 is connected to a -24V voltage.

[0037] The Hall current sensor is powered by +24V, -24V, and GND, both positive and negative voltages. Two ammeters are installed to indicate the forward and reverse current values ​​flowing through the Hall current sensor. The Hall element output load resistor R13 is 30 ohms. The current output by the Hall current sensor is proportional to the detection current (current flowing through resistor R7 * number of coil turns), with the ratio complying with the Hall sensor's technical specifications. The output current value of the Hall current sensor is displayed by two ammeters. By comparing the current values ​​displayed by the ammeters with the theoretical values ​​when the device is in different gears, it is possible to determine whether the Hall current sensor is faulty and whether its accuracy is within the specified range.

[0038] The working principle of the utility model is as follows: the reference voltage module is used to obtain the reference voltage and output it to the adjustable voltage module; the adjustable voltage module is used to output an adjustable stable voltage and output it to the constant current module; the constant current module is used to fix the output current of the connected device based on the input stable voltage size; the current detection module is used to detect the output current size of the Hall current sensor.

[0039] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive.

[0040] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A Hall current sensor detection device, characterized in that: The Hall current sensor detection device comprises: A reference voltage module is used to obtain a reference voltage and output it to the adjustable voltage module; The adjustable voltage module is used to output an adjustable stable voltage to the constant current module; The constant current module is used to stabilize the output current of the connected device based on the input voltage; Current detection module, used to detect the output current of the Hall current sensor; The reference voltage module is connected to the adjustable voltage module, the adjustable voltage module is connected to the constant current module, and the constant current module is connected to the current detection module.

2. The Hall current sensor detection device according to claim 1, characterized in that: The reference voltage module includes a resistor R1, a voltage regulator TL431, a potentiometer R2, a resistor R5, and a capacitor C5. One end of the resistor R1 is connected to a 12V voltage, and the other end of the resistor R1 is connected to the negative electrode of the voltage regulator TL431, one end of the potentiometer R2, and one end of the capacitor C5. The reference electrode of the voltage regulator TL431 is connected to the other end of the potentiometer R2 and one end of the resistor R5. The positive electrode of the voltage regulator TL431 is connected to the other end of the resistor R5, the other end of the capacitor C5, and the common ground.

3. The Hall current sensor detection device according to claim 1, characterized in that: The adjustable voltage module includes an adjustable potentiometer U2. The model of the adjustable potentiometer U2 is X9511. Pin 1 of the adjustable potentiometer U2 is grounded through switch K1, pin 2 of the adjustable potentiometer U2 is grounded through switch K2, pin 3 of the adjustable potentiometer U2 is connected to the reference voltage module through resistor R9, pin 4 of the adjustable potentiometer U2 is grounded, pin 5 of the adjustable potentiometer U2 is connected to the constant current module, pin 6 of the adjustable potentiometer U2 is grounded, pin 7 of the adjustable potentiometer U2 is grounded through resistor R12, pin 8 of the adjustable potentiometer U2 is connected to the cathode of the diode D2, and the anode of the diode D2 is connected to the reference voltage module.

4. The Hall current sensor detection device according to claim 1, characterized in that: The constant current module includes an amplifier U1A, a MOS tube Q1, and a resistor R7. The non-inverting end of the amplifier U1A is connected to the adjustable voltage module through the resistor R3. The inverting end of the amplifier U1A is connected to one end of the capacitor C4, the output end of the amplifier U1B, and one end of the resistor R11. The output end of the amplifier U1A is connected to the other end of the capacitor C4 and one end of the resistor R4. The other end of the resistor R4 is connected to the G pole of the MOS tube Q1. The D pole of the MOS tube Q1 is connected to the current source through the interface J1. The S pole of the MOS tube Q1 is connected to one end of the resistor R7 and one end of the resistor R6. The other end of the resistor R7 is grounded. The other end of the resistor R6 is connected to the non-inverting end of the amplifier U1B. The inverting end of the amplifier U1B is connected to the other end of the resistor R11 and one end of the resistor R10. The other end of the resistor R10 is grounded.

5. The Hall current sensor detection device according to claim 4, characterized in that: The current detection module includes an interface J4, which is externally connected to a Hall current sensor. The first end of the interface J4 is connected to a +24V voltage, the second end of the interface J4 is connected to one end of the resistor R13, the third end of the interface J4 is connected to the O-end of the voltage and ammeter M7, the other end of the resistor R13 is connected to the O-end of the voltage and ammeter M6, the I+, V, and O+ ends of the voltage and ammeter M6 are connected to a +24V voltage, the I-end of the voltage and ammeter M6 is grounded, the I+, V, and O+ ends of the voltage and ammeter M7 are grounded, and the I-end of the voltage and ammeter M6 is connected to a -24V voltage.

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