阅读说明：本技术 一种霍尔信号采集装置及其工作方法 (Hall signal acquisition device and working method thereof ) 是由 董鑫 魏海峰 王浩陈 张懿 李垣江 刘维亭 于 2019-10-31 设计创作，主要内容包括：本发明提供了一种霍尔信号采集装置,其特征在于,包括：接口单元、霍尔信号采集单元、触发电压调节单元、直流电源单元；接口单元与霍尔信号采集单元相连,用于接入永磁同步电机的霍尔信号；霍尔信号采集单元与触发电压调节单元相连,用于对永磁同步电机的霍尔信号进行电平转化和滤波处理；触发电压调节单元,用于根据触发电压大小将霍尔信号采集单元的输出信号进一步做电平转化,并将处理结果输出；直流电源单元和霍尔信号采集单元以及触发电压调节单元相连,用于给所相连单元供源。当永磁同步电机低速时,本发明通过改变霍尔传感器边沿信号的触发电压,可以有效地缓解转子位置信息滞后的问题,提高永磁同步电机低速性能。(The invention provides a Hall signal acquisition device, which is characterized by comprising: the device comprises an interface unit, a Hall signal acquisition unit, a trigger voltage regulation unit and a direct current power supply unit; the interface unit is connected with the Hall signal acquisition unit and is used for accessing Hall signals of the permanent magnet synchronous motor; the Hall signal acquisition unit is connected with the trigger voltage regulation unit and is used for carrying out level conversion and filtering processing on a Hall signal of the permanent magnet synchronous motor; the trigger voltage adjusting unit is used for further performing level conversion on the output signal of the Hall signal acquisition unit according to the magnitude of the trigger voltage and outputting a processing result; the direct current power supply unit is connected with the Hall signal acquisition unit and the trigger voltage regulation unit and is used for supplying power to the connected units. When the permanent magnet synchronous motor is in low speed, the invention can effectively relieve the problem of lag of the position information of the rotor by changing the trigger voltage of the edge signal of the Hall sensor, and improve the low speed performance of the permanent magnet synchronous motor.)

1. A hall signal pickup assembly comprising: the device comprises an interface unit, a Hall signal acquisition unit, a trigger voltage regulation unit and a direct current power supply unit;

the interface unit is connected with the Hall signal acquisition unit and is used for accessing Hall signals of the permanent magnet synchronous motor;

the Hall signal acquisition unit is connected with the trigger voltage regulation unit and is used for carrying out level conversion and filtering processing on a Hall signal of the permanent magnet synchronous motor;

the trigger voltage adjusting unit is used for carrying out square wave signal standardization processing on the output signal of the Hall signal acquisition unit according to the magnitude of the trigger voltage and outputting a processing result;

the direct current power supply unit is connected with the Hall signal acquisition unit and the trigger voltage regulation unit and is used for supplying power to the Hall signal acquisition unit and the trigger voltage regulation unit.

2. The hall signal pickup assembly of claim 1 wherein the interface unit comprises interface J1, interface J2, interface J3; the Hall signal acquisition unit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2 and a capacitor C3; the direct-current power supply unit is respectively connected with one end of a resistor R1, one end of a resistor R2 and one end of a resistor R3, the other end of the resistor R1 is respectively connected with one end of an interface J1, one end of a capacitor C1 and one end of a resistor R6, the other end of the resistor R2 is respectively connected with one end of an interface J2, one end of a capacitor C2 and one end of a resistor R5, and the other end of the resistor R3 is respectively connected with one end of an interface J3, one end of a capacitor C3 and one end of a resistor R4; the other end of the capacitor C1, the other end of the capacitor C2, and the other end of the capacitor C3 are all connected to ground.

3. The hall signal pickup assembly of claim 2 wherein the trigger voltage adjustment unit comprises: the voltage comparison circuit comprises a voltage comparison chip U1, an adjustable power supply B1, a resistor R7, a resistor R8, a resistor R9, a capacitor C4, a capacitor C5, a capacitor C6 and a capacitor C7, wherein the voltage comparison chip U1 comprises 14 pins, a pin 1 of the voltage comparison chip U1 is respectively connected with one end of the resistor R8 and one end of the capacitor C6, a pin 2 of the voltage comparison chip U1 is respectively connected with one end of the resistor R7 and one end of the capacitor C5, and a pin 14 of the voltage comparison chip U1 is respectively connected with one end of the resistor R9 and one end of the capacitor C7; a No. 3 pin of the voltage comparison chip U1 is respectively connected with the direct-current power supply unit and one end of a capacitor C4; the No. 4 pin, the No. 6 pin and the No. 8 pin of the voltage comparison chip U1 are connected with an adjustable power supply B1; a pin No. 5 of the voltage comparison chip U1 is connected with the other end of the resistor R4, a pin No. 7 of the voltage comparison chip U1 is connected with the other end of the resistor R5, and a pin No. 9 of the voltage comparison chip U1 is connected with the other end of the resistor R6; the No. 10 pin, the No. 11 pin, the No. 12 pin and the No. 13 pin of the voltage comparison chip U1 and the other end of the capacitor C4 are all connected with the ground; the other end of the resistor R7, the other end of the resistor R8, the other end of the resistor R9, the other end of the capacitor C5, the other end of the capacitor C6 and the other end of the capacitor C7 are all connected with the direct-current power supply unit.

4. The Hall signal acquisition device according to claim 3, wherein the adjustable range of the output voltage of the adjustable power supply B1 is 1.2V to 2.0V.

5. The hall signal pickup assembly of claim 4 wherein the adjustable power supply B1 is of the type TPS74201 RGWT.

6. The Hall signal acquisition device of any one of claims 3, 4 and 5 wherein the propagation delay of the voltage comparator U1 is less than 1 us.

7. The hall signal pickup assembly of claim 1 wherein the voltage of the dc power supply unit is 5V or 3.3V.

8. A working method of a Hall signal acquisition device is characterized in that Hall sensor signals are accessed from an interface unit, the accessed Hall sensor signals are nonstandard square waves with variable voltage amplitudes, the Hall signal acquisition unit converts the nonstandard square waves with the variable voltage amplitudes into the nonstandard square waves with fixed voltage amplitudes, and a voltage regulation unit is triggered to convert the nonstandard square waves with the fixed voltage amplitudes into standard square waves, so that the processing of the accessed Hall sensor signals is completed.

9. The operating method of Hall signal collecting device according to claim 8, wherein when a phase Hall sensor signal is accessed from an interface J1 in the interface unit, the resistor R3 in the DC power supply unit and the Hall signal collecting unit converts the Hall signal of the nonstandard square wave with varying voltage amplitude into the nonstandard square wave signal with fixed voltage amplitude, and the harmonic wave in the signal is filtered out by the resistor R4 and the capacitor C3 in the Hall signal collecting unit and sent to the 5 th pin of the voltage comparing chip U1 in the trigger voltage adjusting unit, the voltage comparing chip U1 compares the reference voltage of the 4 th pin with the sent signal, the comparison result outputs the square wave signal with harmonic wave through the 2 nd pin of the voltage comparing chip U1, the square wave signal with harmonic wave of the DC power supply unit, the resistor R7 and the capacitor C5 in the trigger voltage adjusting unit is stabilized to output the standard square wave signal, and finishing the processing of the accessed Hall sensor signals.

Technical Field

The invention relates to a Hall detection technology of a brushless direct current motor, in particular to a Hall signal acquisition device for improving the low-speed performance of a permanent magnet synchronous motor and a working method thereof.

Background

The permanent magnet synchronous motor has the advantages of simple structure, small volume, light weight, small loss, high efficiency, high power factor and the like, and is mainly used for replacing motors of high-performance servo transmission systems and direct current motors which require quick response, wide speed regulation range and accurate positioning.

A hall sensor is commonly used as a position sensor for a permanent magnet synchronous motor. The Hall sensor belongs to a position sensor with low precision, and especially when the permanent magnet synchronous motor is at low speed, the edge signal of the Hall sensor is close to a trapezoidal wave, which can directly lead the position information of a rotor acquired by the Hall sensor to lag, influence the low-speed performance of the permanent magnet synchronous motor and cause the fluctuation of the rotating speed. And the problem of lag of the position information of the rotor can be effectively relieved by improving a hardware circuit and adjusting the trigger voltage of the edge signal of the Hall sensor, and the low-speed performance of the permanent magnet synchronous motor is improved.

Disclosure of Invention

The invention provides a Hall signal acquisition device and a working method thereof, which are used for solving the problem of rotation speed fluctuation caused by lagging rotor position information when a permanent magnet synchronous motor is at a low speed.

The invention provides a Hall signal acquisition device, comprising: the device comprises an interface unit, a Hall signal acquisition unit, a trigger voltage regulation unit and a direct current power supply unit;

the interface unit is connected with the Hall signal acquisition unit and is used for accessing Hall signals of the permanent magnet synchronous motor;

the Hall signal acquisition unit is connected with the trigger voltage regulation unit and is used for carrying out level conversion and filtering processing on a Hall signal of the permanent magnet synchronous motor;

the trigger voltage adjusting unit is used for carrying out square wave signal standardization processing on the output signal of the Hall signal acquisition unit according to the magnitude of the trigger voltage and outputting a processing result;

the direct current power supply unit is connected with the Hall signal acquisition unit and the trigger voltage regulation unit and is used for supplying power to the Hall signal acquisition unit and the trigger voltage regulation unit.

Optionally, the interface unit comprises an interface J1, an interface J2, an interface J3; the Hall signal acquisition unit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2 and a capacitor C3; the direct-current power supply unit is respectively connected with one end of a resistor R1, one end of a resistor R2 and one end of a resistor R3, the other end of the resistor R1 is respectively connected with one end of an interface J1, one end of a capacitor C1 and one end of a resistor R6, the other end of the resistor R2 is respectively connected with one end of an interface J2, one end of a capacitor C2 and one end of a resistor R5, and the other end of the resistor R3 is respectively connected with one end of an interface J3, one end of a capacitor C3 and one end of a resistor R4; the other end of the capacitor C1, the other end of the capacitor C2, and the other end of the capacitor C3 are all connected to ground.

Optionally, the trigger voltage adjusting unit includes: the voltage comparison circuit comprises a voltage comparison chip U1, an adjustable power supply B1, a resistor R7, a resistor R8, a resistor R9, a capacitor C4, a capacitor C5, a capacitor C6 and a capacitor C7, wherein the voltage comparison chip U1 comprises 14 pins, a pin 1 of the voltage comparison chip U1 is respectively connected with one end of the resistor R8 and one end of the capacitor C6, a pin 2 of the voltage comparison chip U1 is respectively connected with one end of the resistor R7 and one end of the capacitor C5, and a pin 14 of the voltage comparison chip U1 is respectively connected with one end of the resistor R9 and one end of the capacitor C7; a No. 3 pin of the voltage comparison chip U1 is respectively connected with the direct-current power supply unit and one end of a capacitor C4; the No. 4 pin, the No. 6 pin and the No. 8 pin of the voltage comparison chip U1 are connected with an adjustable power supply B1; a pin No. 5 of the voltage comparison chip U1 is connected with the other end of the resistor R4, a pin No. 7 of the voltage comparison chip U1 is connected with the other end of the resistor R5, and a pin No. 9 of the voltage comparison chip U1 is connected with the other end of the resistor R6; the No. 10 pin, the No. 11 pin, the No. 12 pin and the No. 13 pin of the voltage comparison chip U1 and the other end of the capacitor C4 are all connected with the ground; the other end of the resistor R7, the other end of the resistor R8, the other end of the resistor R9, the other end of the capacitor C5, the other end of the capacitor C6 and the other end of the capacitor C7 are all connected with the direct-current power supply unit.

Optionally, the adjustable range of the output voltage of the adjustable power supply B1 is 1.2V to 2.0V.

Optionally, the voltage of the dc power supply unit is 5V or 3.3V.

Optionally, the propagation delay of the voltage comparator U1 is less than 1 us.

Optionally, the adjustable power supply B1 is model TPS74201 RGWT.

A working method of a Hall signal acquisition device specifically comprises the following steps:

the Hall signal acquisition unit converts the nonstandard square wave with the variable voltage amplitude into the nonstandard square wave with the fixed voltage amplitude, and the trigger voltage adjustment unit converts the nonstandard square wave with the fixed voltage amplitude into the standard square wave to complete the processing of the accessed Hall sensor signal.

Optionally, when a signal of the one-phase hall sensor is accessed from an interface J1 in the interface unit, a resistor R3 in the direct current power supply unit and the hall signal acquisition unit converts a hall signal of a nonstandard square wave with a variable voltage amplitude into a nonstandard square wave signal with a fixed voltage amplitude, harmonic waves in signals are filtered through a resistor R4 and a capacitor C3 in the Hall signal acquisition unit and are sent to a 5 th pin of a voltage comparison chip U1 in the trigger voltage adjusting unit, the voltage comparison chip U1 compares reference voltage of a 4 th pin with the sent signals, a comparison result outputs square wave signals with harmonic waves through a 2 nd pin of the voltage comparison chip U1, voltage stabilization processing is carried out on the square wave signals with harmonic waves of the direct current power supply unit, the resistor R7 and the capacitor C5 in the trigger voltage adjusting unit, standard square wave signals are output, and processing of the accessed Hall sensor signals is completed.

The invention has the following beneficial effects:

1. the voltage of the direct current power supply unit can be selected to be 5V and 3.3V, and the comparison voltage of the voltage comparison chip U1 is adjustable, namely the adjustable range of the output voltage of the adjustable power supply B1 is 1.2V to 2.0V, so that the device is wide in application range.

2. When the permanent magnet synchronous motor is in low speed, the output voltage of the voltage comparison chip U1 compared with the voltage adjustable power supply B1 is adjusted through the programming of the single chip microcomputer, the trigger voltage of the Hall sensor edge signal is changed, the problem of lag of rotor position information can be effectively relieved, and the low-speed performance of the permanent magnet synchronous motor is improved.

Drawings

FIG. 1 is a circuit diagram of a Hall signal acquisition device according to an embodiment of the present invention;

FIG. 2 is a low speed rotational error plot of an acquisition device utilizing the present invention in an embodiment of the present invention;

FIG. 3 is a low speed rotational error plot utilizing a conventional pick-up device in an embodiment of the present invention.

Detailed Description

In order to make the objects, hardware designs and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention provides a Hall signal acquisition device, comprising: the device comprises a direct-current power supply unit, an interface unit, a Hall signal acquisition unit, a trigger voltage regulation unit and a single chip microcomputer.

The interface unit is connected with the Hall signal acquisition unit and is used for accessing Hall signals of the permanent magnet synchronous motor; the Hall signal acquisition unit is connected with the trigger voltage regulation unit and is used for carrying out level conversion and filtering processing on a Hall signal of the permanent magnet synchronous motor; the trigger voltage adjusting unit is used for further performing level conversion on the output signal of the Hall signal acquisition unit according to the magnitude of the trigger voltage and outputting a processing result; the direct current power supply unit, the Hall signal acquisition unit and the trigger voltage adjusting unit are used for supplying power to the Hall signal acquisition unit and the trigger voltage adjusting unit; the singlechip is connected with the output end of the trigger voltage adjusting unit and used for receiving the processed Hall signal.

As shown in fig. 1, the trigger voltage adjusting unit includes: the voltage comparison chip U1, adjustable power B1, resistance R7 to resistance R9 and electric capacity C4 to electric capacity C7, adjustable power B1 is as the reference voltage of voltage comparison chip U1, by the amplitude size of singlechip control adjustable power B1.

The direct-current power supply unit comprises a power supply A1 for supplying power to the connected units, and the voltage value of the power supply A1 depends on the power supply voltage value of the single chip microcomputer; when the power supply voltage of the single chip microcomputer is 5V, the voltage of the power supply A1 is selected to be 5V; when the power supply voltage of the single chip microcomputer is 3.3V, the voltage of the power supply A1 is 3.3V; the interface unit comprises an interface J1, an interface J2 and an interface J3, and is connected with a Hall sensor of the permanent magnet synchronous motor to be tested; the Hall signal acquisition unit comprises a resistor R1-resistor R6 and a capacitor C1-capacitor C3, is used for acquiring and processing Hall signals,

the interface J1 is respectively connected with one end of a resistor R4, one end of a capacitor C3 and one end of a resistor R3, the other end of the resistor R4 is connected to a 5 th pin of a voltage comparison chip U1, the other end of the capacitor C3 is grounded, and the other end of the resistor R3 is connected with a power supply A1 and used for collecting U-phase Hall signals; the interface J2 is connected with one end of a resistor R5, one end of a capacitor C2 and one end of a resistor R2, the other end of the resistor R5 is connected to a 7 th pin of a voltage comparison chip U1, the other end of the capacitor C2 is grounded, and the other end of the resistor R2 is connected with a power supply A1 and used for collecting V-phase Hall signals; the interface J3 is connected with one end 6 of the resistor R, one end of the capacitor C1 and one end of the resistor R1, the other end of the resistor R6 is connected to a 9 th pin of the voltage comparison chip U1, the other end of the capacitor C1 is grounded, and the other end of the resistor R1 is connected with the power supply A1 and used for collecting W-phase Hall signals; one end of the adjustable power supply B1 is connected with a pin 4, a pin 6 and a pin 8 of the voltage comparison chip U1 and used as a reference voltage of the voltage comparison chip U1, the other end of the adjustable power supply B1 is connected with the single chip microcomputer, and the reference voltage of the voltage comparison chip U1, namely the output voltage range of the adjustable power supply B1, is set to be between 1.2V and 2.0V through the single chip microcomputer according to the amplitude of trapezoidal waves of signals at the edge of the Hall sensor; one end of the capacitor C4 is connected with the 3 rd pin of the voltage comparison chip U1 and the power supply A1, and the other end of the capacitor C4 is grounded and is a power supply of the voltage comparison chip U1; the 12 th pin of the voltage comparison chip U1 is a chip ground pin, and the 10 th pin, the 11 th pin, and the 13 th pin, which are not used in this embodiment, so the 10 th pin, the 11 th pin, the 12 th pin, and the 13 th pin of the voltage comparison chip U1 are grounded; one end of the resistor R7 is connected with the 2 nd pin of the voltage comparison chip U1, one end of the capacitor C5 and the singlechip, the other end of the resistor R7 is connected with a power supply A1, the other end of the capacitor C5 is connected with a power supply A1, and a U-phase Hall signal processed by the voltage comparison chip U1 is input into the singlechip through a pull-up resistor; one end of the resistor R8 is connected with a1 st pin of the voltage comparison chip U1, one end of the capacitor C6 and the singlechip, the other end of the resistor R8 is connected with the power supply A1, the other end of the capacitor C6 is connected with the power supply A1, and a V-phase Hall signal processed by the voltage comparison chip U1 is input into the singlechip through a pull-up resistor; one end of the resistor R9 is connected with the 14 th pin of the voltage comparison chip U1, one end of the capacitor C7 and the single chip microcomputer, the other end of the resistor R9 is connected with the power supply A1, the other end of the capacitor C7 is connected with the power supply A1, and the W-phase Hall signal processed by the voltage comparison chip U1 is input to the single chip microcomputer through the pull-up resistor.

The working method of the device comprises the following steps that for example, an interface J1 in an interface unit is accessed to a phase Hall sensor signal, when the interface J1 in the interface unit is accessed to the phase Hall sensor signal, a power supply A1 and a resistor R3 in a Hall signal acquisition unit realize the voltage pull-up function, the nonstandard square wave Hall signal with variable voltage amplitude is converted into the nonstandard square wave signal with fixed voltage amplitude, and the voltage amplitude is fixed as the voltage amplitude of the power supply A1; harmonic waves in the filtered signals are sent to a 5 th pin of a voltage comparison chip U1 in the trigger voltage adjusting unit through a resistor R4 and a capacitor C3 in the Hall signal acquisition unit, and the resistor R4 and the capacitor C3 form an RC circuit to realize filtering; the voltage comparison chip U1 compares the reference voltage of the 4 th pin with the sent signal, the comparison result outputs a square wave signal with harmonic waves through the 2 nd pin of the voltage comparison chip U1, the Hall signal in the Hall signal acquisition unit is close to a trapezoidal wave with fixed amplitude, the square wave signal with harmonic waves is output after being compared with the reference voltage provided by the adjustable power supply B1 through the voltage comparator, the amplitude of the square wave signal is fixed, and then the trapezoidal wave with fixed amplitude is input in advance in the level jump time sequence; the power supply A1, the resistor R7 and the capacitor C5 in the trigger voltage adjusting unit carry out voltage stabilization processing on square wave signals with harmonic waves to output standard square wave signals, and processing of the accessed Hall sensor signals is completed; the final output Hall waveform is a standard square wave signal with fixed amplitude and less harmonic content, and is ahead of the level jump time sequence of the signal waveform input by the Hall signal acquisition unit. After the Hall signals are accessed to other interfaces, the working mode of the device matched with the interface is the same as that of the device matched with the interface when the Hall sensor signal is accessed from the interface J1 in the interface unit

The voltage comparator U1 is selected to have a propagation delay less than 1us, preferably a high speed voltage comparator AD8612 ARUZ. If the universal voltage comparator is selected, the propagation delay of the universal voltage comparator is generally more than 5us, and the improvement effect of the Hall signal acquisition device on the low-speed performance of the permanent magnet synchronous motor is directly influenced; when the propagation delay is too long, even the low-speed performance of the permanent magnet synchronous motor is deteriorated. The high-speed voltage comparator has nanosecond-level propagation delay and hardly influences propagation.