Anti-interference Hall circuit of acceleration rotating handle

Abstract

The utility model belongs to the technical field of acceleration control, and relates to an anti-interference Hall circuit of an acceleration rotating handle, which comprises a Hall element, a signal conditioning unit, a filtering unit, an output driving unit, a power input, a voltage stabilizing circuit and an electrostatic discharge protection circuit which are electrically connected, an output end of the signal conditioning unit is connected with a signal input end of the filtering unit, an input end of the filtering unit is connected with an output end of the signal conditioning unit, an output end of the filtering unit is connected with a signal input end of the output driving unit, and a ground wire of the filtering unit is connected with a ground wire of power input. The input end of the output driving unit is connected with the output end of the filtering unit, and the output end of the output driving unit is connected with the driving end of the motor. Noise interference in original signals is effectively suppressed, and stability and accuracy of the signals are ensured; the circuit can still work stably under different voltage fluctuations, and the robustness and reliability of the whole system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to acceleration control technical field more specifically, relate to a kind of acceleration handlebar anti-interference hall circuit. BACKGROUND

[0002] In the operation control of electric vehicle, such as electric car, handlebar is a very key component, which perceives the rotation angle of handlebar through Hall element, and then transmits the corresponding electric signal to the controller to adjust the speed of electric car. However, the electric car will face various complex electromagnetic interference environment during driving, such as electromagnetic noise generated from motor operation, surrounding electrical equipment and power fluctuation. These interference signals are easy to affect the normal work of Hall circuit, resulting in the output of error signal by Hall element, which makes the speed control of electric car unstable, and appears problems such as misacceleration, deceleration or speed fluctuation, seriously affects the driving safety and comfort of electric car, and may cause damage to the electrical system of electric car. Therefore, it is necessary to design a handlebar Hall circuit with good anti-interference performance. SUMMARY

[0003] In view of the above defects of the prior art, the utility model provides an acceleration handlebar anti-interference hall circuit, which comprises: a Hall element, a signal conditioning unit, a filter unit, an output driving unit, a power input, a voltage stabilizing circuit and an electrostatic discharge protection circuit connected by electricity, the input end of the signal conditioning unit is connected with the signal output end of the Hall element, the output end of the signal conditioning unit is connected with the signal input end of the filter unit, the input end of the filter unit is connected with the output end of the signal conditioning unit, the output end of the filter unit is connected with the signal input end of the output driving unit, the ground wire of the filter unit is connected with the ground wire of the power input, the input end of the output driving unit is connected with the output end of the filter unit, and the output end of the output driving unit is respectively connected with the driving end of the motor, the voltage stabilizing circuit and the electrostatic discharge protection circuit.

[0004] Preferably, the signal conditioning unit comprises an amplifier and an analog-to-digital converter, the input end of the amplifier is connected with the output end of the Hall element, and the output end of the amplifier is connected with the analog-to-digital converter.

[0005] Preferably, the filter unit comprises one end of an inductor L1 connected with one end of a capacitor C1, and the other end of the capacitor C1 connected with one end of a capacitor C2.

[0006] Preferably, the output driving unit comprises a differential amplifier, a Schmitt trigger, an output buffer and an output driving circuit, the output end of the Hall element is connected with the input end of the differential amplifier, the output end of the differential amplifier is connected with the input end of the Schmitt trigger, the output end of the Schmitt trigger is connected with the input end of the output buffer, and the output end of the output buffer is connected with the input end of the output driving circuit.

[0007] Preferably, the power input comprises two VCC inputs and two GND inputs.

[0008] Preferably, the output driving circuit comprises a MOSFET tube.

[0009] Preferably, the voltage stabilizing circuit comprises a voltage stabilizing chip.

[0010] Preferably, the voltage stabilizing chip comprises any one of an LM78 series, an LM317, an LD1117 series, an AMS1117 and an LM7805.

[0011] Preferably, the electrostatic discharge protection circuit comprises an ESD protection diode D1 and an ESD protection diode D2, the ESD protection diode D1 is arranged between VCC and GND, and the ESD protection diode D2 is arranged between the input pin of the Hall element and GND.

[0012] Preferably, the acceleration handle anti-interference Hall circuit further comprises a digital isolator, which is arranged between the signal conditioning unit and the filtering unit, or between the filtering unit and the output driving unit.

[0013] The acceleration handle anti-interference Hall circuit of the utility model has the following beneficial effects: the Hall element captures the change of the magnetic field and converts it into an electric signal, the noise interference in the original signal is effectively inhibited through the adjustment of the signal conditioning unit, the stability and accuracy of the signal are ensured, and a reliable foundation is provided for subsequent processing; the setting of the filtering unit further filters out high-frequency noise and harmonic components, only allows useful signals to pass through, and significantly improves the signal quality, which is crucial for accurately controlling the motor speed and reducing the misoperation caused by interference; the output driving unit directly receives the pure signal after filtering processing, can respond to the control instruction more quickly, and drives the motor to operate efficiently, and this instant response capability is particularly important for application scenarios that require fast acceleration or accurate speed regulation; the voltage stabilizing circuit ensures that the circuit can still work stably under different voltage fluctuations, and the electrostatic discharge protection circuit effectively prevents the damage of static electricity to the circuit, and both of them improve the robustness and reliability of the whole system. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in these drawings without any creative effort. The present application will be further described below in combination with the drawings and embodiments. In the drawings:

[0015] Figure 1 is a module composition block diagram of the anti-interference Hall circuit of the accelerated rotary knob of the present application;

[0016] Figure 2 is a circuit diagram of the filter unit, electrostatic discharge protection circuit and Hall element in the anti-interference Hall circuit of the accelerated rotary knob of the present application.

[0017] In the drawings, 10-filter unit, 20-electrostatic discharge protection circuit, 30-Hall element. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments only represent some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative effort fall within the scope of protection of the present application.

[0019] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications also change accordingly.

[0020] In addition, if the embodiments of the present application involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that the technical solutions can be realized by those skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0021] The following embodiments take the anti-interference Hall circuit of the acceleration handlebar of the electric bicycle as an example for illustration.

[0022] Please refer to Figure 1 , the module structure block diagram of the anti-interference Hall circuit of the acceleration handlebar of the electric bicycle is shown. Figure 1 As shown in the anti-interference Hall circuit of the acceleration handlebar provided in the first embodiment of the electric bicycle, at least includes, through the electrical connection of the Hall element, the signal conditioning unit, the filter unit, the output driving unit, the power input, the voltage stabilizing circuit and the electrostatic discharge protection circuit, the input end of the signal conditioning unit is connected with the signal output end of the Hall element, the output end of the signal conditioning unit is connected with the signal input end of the filter unit, the input end of the filter unit is connected with the output end of the signal conditioning unit, the output end of the filter unit is connected with the signal input end of the output driving unit, the ground wire of the filter unit is connected with the ground wire of the power input, the input end of the output driving unit is connected with the output end of the filter unit, and the output end of the output driving unit is connected with the driving end of the motor, the voltage stabilizing circuit and the electrostatic discharge protection circuit respectively.

[0023] The Hall element is a key component in the anti-interference Hall circuit of the handlebar of the electric bicycle, including a Hall sensor and a magnet. The Hall sensor contains a magnetic sensitive device inside, which outputs corresponding electrical signals when the magnet is close.

[0024] The three leads of the Hall element are usually arranged according to the standard as green (signal), red (power) and yellow (ground wire). The green line is connected with the signal input end of the signal conditioning unit, the red line is connected with the positive electrode of the power input, and the yellow line is connected with the ground wire.

[0025] In specific implementation, the Hall element is arranged in the rotating part of the handlebar to sense the rotation angle of the handlebar and output electrical signals by detecting the change of the magnetic field. The electrical signals are proportional to the strength of the magnetic field, so the size of the output electrical signals can be controlled by changing the relative position of the magnet and the Hall element (i.e. rotating the handlebar), and then the rotation speed of the motor of the electric bicycle is controlled.

[0026] The signal conditioning unit is used to receive the signals output by the Hall element and amplify and condition the signals to improve the stability and anti-interference ability of the signals, so as to meet the input requirements of the subsequent circuit.

[0027] In specific implementation, the signal conditioning unit includes an amplifier and an analog-to-digital converter, the input end of the amplifier is connected with the output end of the Hall element, and the output end of the amplifier is connected with the analog-to-digital converter. The amplifier is used for signal amplification and conditioning. The amplifier can be selected according to needs, such as voltage amplifier, current amplifier, etc. The types of amplifiers include but are not limited to bridge circuit, excitation constant current source, instrument amplifier, isolation amplifier, etc. Among them, the instrument amplifier is particularly suitable for use in the signal conditioning unit due to its high input impedance, low drift and adjustable gain.

[0028] The analog-to-digital converter is used to convert an analog signal into a digital signal for processing by a digital circuit or a computer. The selection of the analog-to-digital converter needs to be determined according to parameters such as the resolution of the signal, the sampling rate, etc. In the anti-interference Hall circuit of the utility model, in order to reduce the conversion error, a high-resolution, low-noise A / D converter can be selected, and the model of the analog-to-digital converter is not limited herein.

[0029] The filter unit is used to filter the signal output by the signal conditioning unit, and remove high-frequency noise and interference. The filter unit can be composed of a low-pass, high-pass or band-pass filter combined by a capacitor, an inductor, etc., and can filter out interference signals of different frequency bands, such as high-frequency electromagnetic pulse interference and low-frequency power supply fluctuation interference.

[0030] As shown in Figure 2 The filter unit 10 includes: one end of the inductor L1 is connected with one end of the capacitor C1, and the other end of the capacitor C1 is connected with one end of the capacitor C2. The inductor L1 (10uH) is located on the power input line and is between two VCC inputs. The main function of the inductor is to prevent high-frequency current from passing through and allow low-frequency current to pass through, and further filter out high-frequency interference signals in the power supply. There are four filter capacitors (C1, C2, C3, C4) of 100nF in the circuit. C1 and C2 are connected between VCC and GND, and C3 and C4 are also connected between VCC and GND. These capacitors are used to filter out high-frequency noise and ripple in the power supply, and ensure the purity of the power supply.

[0031] Through the filtering effect of the inductor and the capacitor, the high-frequency component in the signal can be filtered out, and the low-frequency component is retained, so that a more pure and stable signal is obtained. This is of great significance to improve the stability and reliability of the battery car.

[0032] The output driving unit is used to receive the filtered signal, buffer and enhance the driving capability, so as to stably transmit the signal to the controller such as the motor, and drive the motor to rotate through power amplification.

[0033] In specific implementation, the output driving unit includes: a differential amplifier, a Schmitt trigger, an output buffer and an output driving circuit, the output end of the Hall element is connected with the input end of the differential amplifier, the output end of the differential amplifier is connected with the input end of the Schmitt trigger, the output end of the Schmitt trigger is connected with the input end of the output buffer, and the output end of the output buffer is connected with the input end of the output driving circuit.

[0034] The differential amplifier is used to amplify the weak potential difference output by the Hall element. Through differential amplification, the signal-to-noise ratio can be significantly improved, providing a stable and reliable input signal for subsequent processing.

[0035] The Schmitt trigger is a comparator with hysteresis characteristics, used to shape the amplified signal. It can convert continuous analog signals into discrete digital signals, ensuring signal stability and reliability. In addition, the Schmitt trigger has anti-interference ability, which can suppress noise interference in the input signal.

[0036] The output buffer is used to provide sufficient driving ability and stability at the output end. It can buffer and amplify the digital signal output by the Schmitt trigger to meet the requirements of subsequent circuits for signal power and stability.

[0037] The output drive circuit is the core part of the output drive unit, which is responsible for converting the buffered signal into a power signal that can drive the motor or other loads. The output drive circuit can include MOSFET tubes, IGBTs, etc., which can withstand large currents and voltages to ensure the normal operation of the motor.

[0038] The power input and voltage stabilization circuit is used to provide stable DC power, and the electrostatic discharge protection circuit is used to protect the circuit from electrostatic discharge transient voltage, improving the reliability of the circuit.

[0039] The power input includes two VCC inputs and two GND inputs. The power input is designed for redundancy to ensure the stability of the power supply. The dual VCC and GND redundancy design provides stability of the power supply, and even if one path fails, the system can obtain stable power supply from another path, ensuring the continuous operation of the device. This design enhances the reliability of the system and reduces the risk of system failure due to single-point failure. Redundant power paths help to distribute current load and reduce thermal stress on power lines and power components, improving the overall durability of the system.

[0040] The voltage stabilization circuit includes a voltage stabilization chip. The voltage stabilization chip includes but is not limited to any one of the LM78 series, LM317, LD1117 series, AMS1117, and LM7805. In this embodiment, the voltage stabilization chip is selected as AMS1117. The voltage stabilization chip can achieve stable output voltage within a wide input voltage range, unaffected by load changes, with better stability than other regulation methods. The voltage stabilization chip can maximize power energy preservation, reduce energy waste, and improve power efficiency. The voltage stabilization chip is small in size and light in weight, which can effectively reduce the size and weight of the device. In addition, the voltage stabilization chip has a relatively low price and is easy to integrate and use.

[0041] As Figure 2As shown, the Hall element 30 includes a linear Hall sensor chip U1. The linear Hall sensor chip U1 includes, but is not limited to, an MS49E. The MS49E has three pins: VDD (input), GND (ground), and OUT (output). The function of the MS49E is to stabilize the input VCC voltage to a specific value through an inductive magnet and output the stabilized voltage from the OUT pin.

[0042] The electrostatic discharge protection circuit 20 includes an ESD protection diode D1 and an ESD protection diode D2. The ESD protection diode D1 is arranged between VCC and GND, and the ESD protection diode D2 is arranged between the input pin of the Hall element and GND. The functions of the ESD protection diodes D1 and D2 are to prevent damage to the Hall element caused by electrostatic discharge. When there is an electrostatic pulse, the ESD diode will quickly conduct and release the electrostatic energy to the ground.

[0043] The filtered, stabilized, and ESD-protected power supply is output from the OUT pin of the Hall element for use by other circuits.

[0044] The power supply is input from VCC, first passing through an LC filter composed of filter capacitors C1 and C2 and inductor L1 to filter out high-frequency interference signals.

[0045] The filtered power supply is input to the Hall element, which stabilizes the voltage to a specific value and outputs the stabilized voltage from the OUT pin.

[0046] At the input pin of the power supply and the linear Hall sensor chip U1, the ESD protection diode provides electrostatic discharge protection to ensure the safety of the circuit when encountering an electrostatic pulse.

[0047] Finally, the filtered, stabilized, and protected power supply is output from the OUT pin for use by other electronic devices or circuits.

[0048] Through the multi-level protection and filtering mechanism, the stability and safety of the output power supply are ensured.

[0049] In some optional implementations of the present embodiment, the utility model speed-up handle anti-interference Hall circuit can further include a digital isolator. The digital isolator is arranged between the signal conditioning unit and the filtering unit, or between the filtering unit and the output driving unit. The digital isolator includes an optical coupler or a magnetic coupler. The digital isolator can prevent high-voltage or high-current faults from propagating through the ground wire, protecting subsequent circuits from damage; it can also isolate external electromagnetic interference, especially high-frequency noise, improving signal quality; it can also increase safety: providing an additional safety barrier in electrical systems, meeting the requirements of safety standards.

[0050] It should be noted that the above modules and electronic components are not limited to those shown in the drawings of the utility model, and can be reduced or increased, changed in type or parameter, etc.

[0051] The utility model discloses a design through above embodiment, its beneficial effect is: through the Hall element capture magnetic field variation and convert into electric signal, through the adjustment of signal conditioning unit, effectively suppressed the noise interference in original signal, has guaranteed the stability and accuracy of signal, has provided reliable foundation for subsequent processing, the setting of filter unit has further filtered out high frequency noise and harmonic component, only allows useful signal to pass, has improved signal quality significantly, this is important for accurate control motor speed, has reduced the misoperation due to interference, output drive unit directly receives the pure signal after filtering processing, can respond control instruction more quickly, drives motor efficient operation, and this instantaneous response ability is particularly important for the application scene that needs fast acceleration or accurate speed regulation, the voltage stabilizing circuit has guaranteed that circuit still can steady work under different voltage fluctuation, and electrostatic discharge protection circuit has effectively prevented static electricity to the damage of circuit, and both common promotion the robustness and reliability of whole system.

[0052] The utility model is described according to specific embodiment, but the person skilled in the art should understand that various changes and equivalent replacement can be carried out without departing from the scope of the utility model. In addition, in order to adapt to the specific occasion of the utility model technology, the utility model can be modified in many ways without departing from its protection scope. Therefore, the utility model is not limited to the specific embodiment disclosed herein, but includes all embodiments falling within the scope of the claims.

Claims

1. An accelerated knob anti-interference Hall circuit, characterized in that, The application relates to a Hall element, a signal conditioning unit, a filter unit, an output driving unit, a power input, a voltage stabilizing circuit and an electrostatic discharge protection circuit, the signal conditioning unit is connected with the signal output end of the Hall element, the output end of the signal conditioning unit is connected with the signal input end of the filter unit, the input end of the filter unit is connected with the output end of the signal conditioning unit, the output end of the filter unit is connected with the signal input end of the output driving unit, the ground wire of the filter unit is connected with the ground wire of the power input, the input end of the output driving unit is connected with the output end of the filter unit, and the output end of the output driving unit is respectively connected with the driving end of a motor, the voltage stabilizing circuit and the electrostatic discharge protection circuit. The signal conditioning unit comprises an amplifier and an analog-to-digital converter, the input end of the amplifier is connected with the output end of the Hall element, and the output end of the amplifier is connected with the analog-to-digital converter.

2. The accelerated knob anti-interference Hall circuit according to claim 1, characterized in that, The filter unit comprises one end of an inductor L1 and one end of a capacitor C1, and the other end of the capacitor C1 and one end of a capacitor C2.

3. The accelerated knob anti-interference Hall circuit according to claim 1, characterized in that, The output driving unit comprises a differential amplifier, a Schmitt trigger, an output buffer and an output driving circuit, the output end of the Hall element is connected with the input end of the differential amplifier, the output end of the differential amplifier is connected with the input end of the Schmitt trigger, the output end of the Schmitt trigger is connected with the input end of the output buffer, and the output end of the output buffer is connected with the input end of the output driving circuit.

4. The accelerated knob anti-interference Hall circuit according to claim 1, characterized in that, The power input comprises two VCC inputs and two GND inputs.

5. The accelerated knob anti-interference Hall circuit according to claim 1, characterized in that, The output driving circuit comprises a MOSFET tube.

6. The accelerated knob anti-interference Hall circuit according to claim 4, characterized in that, The voltage stabilizing circuit comprises a voltage stabilizing chip.

7. The accelerated knob anti-interference Hall circuit according to claim 5, characterized in that, The voltage stabilizing chip comprises any one of an LM78 series, an LM317, an LD1117 series, an AMS1117 and an LM7805.

8. The accelerated knob anti-interference Hall circuit according to claim 7, characterized in that, The electrostatic discharge protection circuit comprises ESD protection diodes D1 and D2, the ESD protection diode D1 is arranged between VCC and GND, and the ESD protection diode D2 is arranged between the input pin of the Hall element and GND.

9. The accelerated knob anti-interference Hall circuit according to claim 8, characterized in that, The application further comprises a digital isolator, which is arranged between the signal conditioning unit and the filter unit or between the filter unit and the output driving unit.

10. The accelerated knob anti-interference Hall circuit according to any one of claims 1 to 9, characterized in that, ​

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