Current-type Hall effect acquisition circuit

Abstract

This application provides a current-type Hall effect sensor circuit, belonging to the technical field of Hall effect sensor circuits. Addressing the problem of poor output signal stability in Hall effect sensor circuits, this application provides a current-type Hall effect sensor circuit, including: an operational amplifier, a voltage divider unit, a feedback unit, a first RC low-pass filter unit, and a second RC low-pass filter unit; the first RC low-pass filter unit is connected between the non-inverting input terminal of the operational amplifier and an external driving module, which outputs a Hall signal during driving; a voltage divider unit is connected between the inverting input terminal of the operational amplifier and the power supply voltage terminal, and a feedback unit is connected between the output terminal of the operational amplifier and its inverting input terminal, forming a feedback loop, with the power supply voltage terminal providing the power supply voltage signal; the second RC low-pass filter unit is connected between the output terminal of the operational amplifier and an external processing module. This application has strong adaptability and high output signal stability.

Description

Technical Field

[0001] This application relates to the field of Hall effect acquisition circuit technology, and more particularly to current-type Hall effect acquisition circuits. Background Technology

[0002] In the electric vehicle industry, Hall effect sensor circuits play a crucial role, especially in motor control. These motors rely on Hall effect sensors for precise position feedback, thereby achieving efficient control.

[0003] There are many different designs for Hall effect acquisition circuits, but many current designs simply add basic filtering to the circuit. However, the filtering frequency band is fixed and cannot effectively filter out irregular input signals, resulting in unstable output signals and causing false triggering or counting errors of the acquired Hall effect sensors. Utility Model Content

[0004] The purpose of this application is to solve the problem of poor output signal stability in existing Hall effect acquisition circuits. Therefore, this application provides a current-type Hall effect acquisition circuit. By adding an operational amplifier with feedback to the Hall effect acquisition circuit, it exhibits hysteresis characteristics, enabling stable operation under different power supply voltage conditions, thus improving adaptability. Furthermore, fluctuations in the input Hall signal do not frequently trigger changes in the output state, thereby improving signal stability.

[0005] This application provides a current-type Hall effect acquisition circuit, including: an operational amplifier, a voltage divider unit, a feedback unit, a first RC low-pass filter unit, and a second RC low-pass filter unit;

[0006] A first RC low-pass filter unit is connected between the non-inverting input terminal of the operational amplifier and the external driving module. The external driving module is used to output a Hall signal during driving, and the first RC low-pass filter unit is used to filter the Hall signal.

[0007] The voltage divider unit is connected between the inverting input terminal and the power supply voltage terminal of the operational amplifier, and a feedback unit is connected between the output terminal and the inverting input terminal of the operational amplifier to form a feedback loop. The power supply voltage terminal is used to provide the power supply voltage signal.

[0008] A second RC low-pass filter unit is connected between the output terminal of the operational amplifier and the external processing module. The second RC low-pass filter unit is used to filter the output signal of the operational amplifier.

[0009] In some embodiments, resistor R5 and capacitor C4 are also included;

[0010] The resistor R5 is connected between the power supply voltage terminal and the input terminal of the first RC low-pass filter unit, the first terminal of the capacitor C4 is connected between the external drive module and the input terminal of the first RC low-pass filter unit, and the second terminal of the capacitor C4 is grounded.

[0011] In some embodiments, a capacitor C5 is connected between the output terminal of the operational amplifier and its non-inverting input terminal, and the capacitor C5 is used for filtering.

[0012] In some embodiments, resistor R4 is also included;

[0013] The first end of the resistor R4 is connected between the output of the operational amplifier and the input of the second RC low-pass filter unit, and the second end of the resistor R4 is connected to a 5V power supply to achieve pull-up.

[0014] In some embodiments, the first RC low-pass filter unit includes resistor R7, resistor R8, and capacitor C2;

[0015] The resistor R7 is connected between the external drive module and the first end of the resistor R8, the second end of the resistor R8 is grounded, the first end of the capacitor C2 is connected between the first end of the resistor R8 and the non-inverting input of the operational amplifier, and the second end of the capacitor C2 is grounded.

[0016] In some embodiments, the voltage divider unit includes resistor R1, resistor R3, and capacitor C1;

[0017] The resistor R1 is connected between the power supply voltage terminal and the first terminal of the resistor R3, the second terminal of the resistor R3 is grounded, the first terminal of the capacitor C1 is connected between the first terminal of the resistor R3 and the inverting input terminal of the operational amplifier, and the second terminal of the capacitor C1 is grounded.

[0018] In some embodiments, the feedback unit includes a resistor R2 connected between the output of the operational amplifier and its inverting input.

[0019] In some embodiments, the second RC low-pass filter unit includes a resistor R6, a Zener diode D1, and a capacitor C3;

[0020] The resistor R6 is connected between the first end of the resistor R4 and the first end of the Zener diode D1, and the second end of the Zener diode D1 is grounded. The first end of the capacitor C3 is connected between the first end of the Zener diode D1 and the external processing module, and the second end of the capacitor C3 is grounded.

[0021] In some embodiments, the external drive module is a motor, and the external processing module is a microcontroller.

[0022] Beneficial effects:

[0023] This application employs an operational amplifier design with feedback, featuring hysteresis characteristics that triggers output state transitions when the input signal reaches different thresholds. This design enables stable operation over a wide input voltage range (9V~16V) of the power supply VCC, while effectively handling input signal fluctuations. It ensures that the output signal is accurately transmitted to the microcontroller, avoiding false triggering caused by minor fluctuations and improving the stability and noise immunity of Hall signal detection.

[0024] Other features and corresponding beneficial effects of this application will be described in the latter part of the specification, and it should be understood that at least some of the beneficial effects will become obvious from the description in this application. Attached Figure Description

[0025] Figure 1 This is the circuit diagram for this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. External drive module; 2. Power supply voltage terminal; 3. External processing module;

[0028] 10. Operational amplifier; 20. Voltage divider unit; 30. Feedback unit; 40. First RC low-pass filter unit; 50. Second RC low-pass filter unit. Detailed Implementation

[0029] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with preferred embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details will be included in the following description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0030] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more. Unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In the electric vehicle industry, most Hall signals are currently integrated into the motor. The control end only needs to accept the input of external Hall signals, process them through the acquisition circuit, and then output them to the microcontroller port (HALL_MCU). However, the signal stability of the existing acquisition circuit is poor, which can easily cause false triggering or counting errors of the acquired Hall signals.

[0033] Therefore, please see Figure 1 , Figure 1 This is the circuit diagram for this application.

[0034] This application provides a current-type Hall effect sensor circuit, including: an operational amplifier 10, a voltage divider unit 20, a feedback unit 30, a first RC low-pass filter unit 40, and a second RC low-pass filter unit 50. This application employs an operational amplifier 10 with feedback, which has hysteresis characteristics and can trigger output state transitions when the input signal reaches different thresholds. This design can operate stably within a wide voltage input range of power supply VCC (9V~16V), while effectively handling input signal fluctuations, ensuring that the output signal is accurately transmitted to the microcontroller, avoiding false triggering caused by minor fluctuations, and improving the stability and noise immunity of Hall signal detection.

[0035] In one embodiment, a first RC low-pass filter unit 40 is connected between the non-inverting input terminal (U+) of the operational amplifier 10 and the external drive module 1.

[0036] External drive module 1 is used to output Hall signals during driving.

[0037] The first RC low-pass filter unit 40 is used to filter the Hall signal to remove some irregular signals in the input Hall signal.

[0038] A voltage divider unit 20 is connected between the inverting input terminal (U-) of the operational amplifier 10 and the power supply voltage terminal 2. The reference voltage generated by the voltage divider unit 20 is input to the inverting input terminal of the operational amplifier 10, and a feedback unit 30 is connected between the output terminal of the operational amplifier 10 and its inverting input terminal to form a feedback loop.

[0039] Power supply voltage terminal 2 is used to provide a power supply voltage signal, which can be the power input from the vehicle to the controller.

[0040] A second RC low-pass filter unit 50 is connected between the output terminal (Uo) of the operational amplifier 10 and the external processing module 3. The second RC low-pass filter unit 50 is used to filter the output signal of the operational amplifier 10 to further improve the stability of the output signal.

[0041] The core of this circuit is a hysteresis interval consisting of an upper and lower threshold. When the input Hall signal is at the upper or lower threshold, the output state remains unchanged, avoiding false triggering due to signal jitter. These upper and lower thresholds are formed by a voltage divider unit 20 connected to the inverting input of operational amplifier 10. The resistance in the voltage divider unit 20 is adjusted to adapt to different scenarios, and the threshold is dynamically adjusted via feedback unit 30.

[0042] In one embodiment, a resistor R5 and a capacitor C4 are also included.

[0043] Resistor R5 is connected between the power supply voltage terminal 2 and the input terminal of the first RC low-pass filter unit 40 to achieve pull-up.

[0044] The first end of capacitor C4 is connected between the external drive module 1 and the input end of the first RC low-pass filter unit 40, and the second end of capacitor C4 is grounded to achieve port protection.

[0045] In one embodiment, a capacitor C5 is connected between the output terminal of the operational amplifier 10 and its non-inverting input terminal, and the capacitor C5 is used for filtering.

[0046] In one embodiment, a resistor R4 is also included.

[0047] The first end of resistor R4 is connected between the output of operational amplifier 10 and the input of the second RC low-pass filter unit 50. The second end of resistor R4 is connected to a 5V power supply and is pulled up to ensure the default level.

[0048] In one embodiment, the first RC low-pass filter unit 40 includes resistors R7 and R8 and capacitor C2.

[0049] Resistor R7 is connected between the external drive module 1 and the first end of resistor R8, and the second end of resistor R8 is grounded. The first end of capacitor C2 is connected between the first end of resistor R8 and the non-inverting input of operational amplifier 10, and the second end of capacitor C2 is grounded.

[0050] In one embodiment, the voltage divider unit 20 includes resistors R1 and R3 and capacitor C1.

[0051] Resistor R1 is connected between the power supply voltage terminal 2 and the first terminal of resistor R3, and the second terminal of resistor R3 is grounded. The first terminal of capacitor C1 is connected between the first terminal of resistor R3 and the inverting input terminal of operational amplifier 10, and the second terminal of capacitor C1 is grounded.

[0052] In one embodiment, the feedback unit 30 includes a resistor R2 connected between the output of the operational amplifier 10 and its inverting input.

[0053] In one embodiment, the second RC low-pass filter unit 50 includes a resistor R6, a Zener diode D1, and a capacitor C3.

[0054] Resistor R6 is connected between the first end of resistor R4 and the first end of Zener diode D1. The second end of Zener diode D1 is grounded. The first end of capacitor C3 is connected between the first end of Zener diode D1 and external processing module 3. The second end of capacitor C3 is grounded.

[0055] Zener diode D1 clamps and protects port 3 of the external processing module.

[0056] In one embodiment, the external drive module 1 is a motor, that is, the Hall signal output by the Hall sensor at the motor end is connected to the input port (Ui) of this circuit; the external processing module 3 is a microcontroller.

[0057] Please see again Figure 1 In this application, after the Hall signal is input, it is divided by the pull-up resistor R5, and the non-inverting and inverting inputs of the operational amplifier both obtain U- and U+. After comparison, the output level of Pin2 of U1A is sent to the microcontroller MCU port for identification. In the change of Hall signal from valid to invalid to valid, the microcontroller MCU port can identify the high and low level transitions.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A current-type Hall effect acquisition circuit, characterized in that, include: Operational amplifier, voltage divider unit, feedback unit, first RC low-pass filter unit, and second RC low-pass filter unit; A first RC low-pass filter unit is connected between the non-inverting input terminal of the operational amplifier and the external driving module. The external driving module is used to output a Hall signal during driving, and the first RC low-pass filter unit is used to filter the Hall signal. The voltage divider unit is connected between the inverting input terminal and the power supply voltage terminal of the operational amplifier, and a feedback unit is connected between the output terminal and the inverting input terminal of the operational amplifier to form a feedback loop. The power supply voltage terminal is used to provide the power supply voltage signal. A second RC low-pass filter unit is connected between the output terminal of the operational amplifier and the external processing module. The second RC low-pass filter unit is used to filter the output signal of the operational amplifier.

2. The current-type Hall effect acquisition circuit according to claim 1, characterized in that, It also includes resistor R5 and capacitor C4; The resistor R5 is connected between the power supply voltage terminal and the input terminal of the first RC low-pass filter unit, the first terminal of the capacitor C4 is connected between the external drive module and the input terminal of the first RC low-pass filter unit, and the second terminal of the capacitor C4 is grounded.

3. The current-type Hall effect acquisition circuit according to claim 1, characterized in that, A capacitor C5 is connected between the output terminal and the non-inverting input terminal of the operational amplifier. The capacitor C5 is used for filtering.

4. The current-type Hall effect acquisition circuit according to claim 1, characterized in that, It also includes resistor R4; The first end of the resistor R4 is connected between the output of the operational amplifier and the input of the second RC low-pass filter unit, and the second end of the resistor R4 is connected to a 5V power supply to achieve pull-up.

5. The current-type Hall effect acquisition circuit according to claim 1, characterized in that, The first RC low-pass filter unit includes resistor R7, resistor R8 and capacitor C2; The resistor R7 is connected between the external drive module and the first end of the resistor R8, the second end of the resistor R8 is grounded, the first end of the capacitor C2 is connected between the first end of the resistor R8 and the non-inverting input of the operational amplifier, and the second end of the capacitor C2 is grounded.

6. The current-type Hall effect acquisition circuit according to claim 1, characterized in that, The voltage divider unit includes resistor R1, resistor R3, and capacitor C1; The resistor R1 is connected between the power supply voltage terminal and the first terminal of the resistor R3, the second terminal of the resistor R3 is grounded, the first terminal of the capacitor C1 is connected between the first terminal of the resistor R3 and the inverting input terminal of the operational amplifier, and the second terminal of the capacitor C1 is grounded.

7. The current-type Hall effect acquisition circuit according to claim 1, characterized in that, The feedback unit includes a resistor R2, which is connected between the output terminal and the inverting input terminal of the operational amplifier.

8. The current-type Hall effect acquisition circuit according to claim 4, characterized in that, The second RC low-pass filter unit includes a resistor R6, a Zener diode D1, and a capacitor C3; The resistor R6 is connected between the first end of the resistor R4 and the first end of the Zener diode D1, and the second end of the Zener diode D1 is grounded. The first end of the capacitor C3 is connected between the first end of the Zener diode D1 and the external processing module, and the second end of the capacitor C3 is grounded.

9. The current-type Hall effect acquisition circuit according to claim 1, characterized in that, The external drive module is a motor, and the external processing module is a microcontroller.

Images