阅读说明：本技术 一种角度传感器激励信号的产生方法及产生装置 (Method and device for generating excitation signal of angle sensor ) 是由 解宝彬 吴盼良 吴长安 韩丽娟 于 2020-11-26 设计创作，主要内容包括：本发明公开了一种角度传感器激励信号的产生方法及产生装置,通过CPLD产生数字信号,有效的减少电路板上占用的空间,能够精准、稳定的为角度传感器提供激励信号,能够满足角度传感器反馈角度信息的要求,能够准确的输出角度信号。(The invention discloses a method and a device for generating an excitation signal of an angle sensor, which can effectively reduce the occupied space on a circuit board by generating a digital signal through a CPLD (complex programmable logic device), can accurately and stably provide the excitation signal for the angle sensor, can meet the requirement of the angle sensor on angle information feedback, and can accurately output an angle signal.)

1. A method for generating an excitation signal of an angle sensor is characterized in that the excitation signal required by the angle sensor is output through a CPLD programmer, the excitation signal is converted into an analog signal through a DA conversion circuit, the analog signal is subtracted from a reference voltage to obtain a new analog signal with driving capacity, then the new analog signal is subjected to signal inversion through an operational amplifier, and finally the required excitation signal is obtained.

2. The device for generating the excitation signal of the angle sensor is characterized by comprising a CPLD programmer, a DA conversion circuit, an operational amplifier N1A and an operational amplifier N1B;

the CPLD programmer is used for generating an excitation signal required by the angle sensor;

the DA conversion circuit converts the excitation signal generated by the CPLD programmer into an analog signal;

the operational amplifier N1A subtracts the analog signal from the reference voltage to obtain a new analog signal Z1 with driving capability;

the operational amplifier N1B inverts the analog signal Z1 to obtain a signal Z2;

then Z1 is supplied to the angle sensor together with Z2, resulting in an excitation signal.

3. The apparatus for generating an excitation signal of an angle sensor as claimed in claim 2, wherein the frequency of the excitation signal required for the angle sensor is 2K, and the peak value is a sinusoidal excitation signal of-3.25V to 3.25V.

4. An angle sensor excitation signal generation apparatus as claimed in claim 2, wherein said DA conversion circuit converts the excitation signal into a sinusoidal waveform having a frequency of 2k and a peak value of 3.951V to 1.08V.

5. An angle sensor excitation signal generation apparatus as claimed in claim 4, wherein said operational amplifier N1A converts the output signal of the DA conversion circuit into a sinusoidal signal with a frequency of 2k and a peak value of 3.951V to 1.08V.

6. An angle sensor excitation signal generation device as claimed in claim 5, wherein the operational amplifier N1B converts the signal Z1 into a 2 times signal Z2 of 2.5V standard voltage minus Z1.

7. An angle sensor excitation signal generation apparatus as claimed in claim 2, wherein said DA conversion circuit is of the type DAC 7512.

8. An angle sensor excitation signal generation device as claimed in claim 2, wherein the operational amplifier N1A and the operational amplifier N1B are of the type AD8397 ARDZ.

Technical Field

The invention belongs to the technical field of seeker electrical signal processing, and particularly relates to a method and a device for generating an angle sensor excitation signal.

Background

The seeker is a highly integrated military product formed by cross combination of multiple subjects such as optics, electromechanics, power electronics, control science and the like. The seeker stabilization platform is a core component of the seeker, the control system is a part of the seeker and generally comprises a control circuit, a right-angle motor, an angle sensor, a speed sensor and the like, the sensor is used for measuring the angle and speed deviation of the seeker, the deviation signal is processed, then the control circuit is used for calculating and controlling the double-shaft motor, so that the deviation is eliminated, and finally the optical axis clock of detection devices such as infrared or laser and the like is kept stable in view field. Therefore, the accuracy and timeliness of the signal of the seeker sensor are very important, and the key of stable guidance control is the accuracy and timeliness of the signal of the seeker sensor.

Therefore, to improve the accuracy of the seeker control, it is necessary to improve the accuracy of the angle sensor.

Disclosure of Invention

In view of the above, the present invention provides a method and an apparatus for generating an excitation signal of an angle sensor, so as to accurately excite the angle sensor.

An excitation signal required by an angle sensor is output through a CPLD programmer, the excitation signal is converted into an analog signal through a DA conversion circuit, the analog signal is subtracted from a reference variable voltage to obtain a new analog signal with driving capacity, the new analog signal is subjected to signal inversion through an operational amplifier, and finally the required excitation signal is obtained.

A device for generating an excitation signal of an angle sensor comprises a CPLD programmer, a DA conversion circuit, an operational amplifier N1A and an operational amplifier N1B;

the CPLD programmer is used for generating an excitation signal required by the angle sensor;

the DA conversion circuit converts the excitation signal generated by the CPLD programmer into an analog signal;

the operational amplifier N1A subtracts the analog signal from the reference voltage to obtain a new analog signal Z1 with driving capability;

the operational amplifier N1B inverts the analog signal Z1 to obtain a signal Z2;

then Z1 is supplied to the angle sensor together with Z2, resulting in an excitation signal.

Preferably, the frequency of the excitation signal required by the angle sensor is 2K, and the peak value is a sinusoidal excitation signal of-3.25V to 3.25V.

Preferably, the DA conversion circuit converts the excitation signal into a sinusoidal waveform with a frequency of 2k and a peak value from 3.951V to 1.08V.

Preferably, the operational amplifier N1A changes the signal output by the DA conversion circuit into a sinusoidal signal with a frequency of 2k and a peak value from 3.951V to 1.08V.

Preferably, the operational amplifier N1B converts the signal Z1 into 2 times the 2.5V standard voltage minus the signal Z2 of Z1.

Preferably, the model of the DA conversion circuit is DAC 7512.

Preferably, the type of the operational amplifier N1A and the operational amplifier N1B is AD8397 ARDZ.

The invention has the following beneficial effects:

aiming at the seeker electrical control system, the digital signal is generated through the CPLD, so that the occupied space on the circuit board is effectively reduced, the excitation signal can be accurately and stably provided for the angle sensor, the requirement of the angle sensor on angle information feedback can be met, and the angle signal can be accurately output.

Drawings

FIG. 1 is an excitation signal flow diagram of the present invention.

Fig. 2 is a circuit diagram of the excitation generation of the present invention.

Detailed Description

The invention is described in detail below by way of example with reference to the accompanying drawings.

The main purpose of the present invention is to provide a reliable and accurate output circuit of excitation signals for an angle sensor, as shown in fig. 1, the excitation signals required by the angle sensor are obtained through calculation, digital signals are generated and output through a CPLD design, the conversion from the digital signals to analog signals is realized through a DA conversion circuit, and the excitation signals required by the angle sensor are obtained through the reverse processing of the signals realized through an operational amplifier.

The technical scheme adopted by the invention is as follows: the method comprises the steps of outputting an excitation signal required by an angle sensor through a CPLD programmer according to the requirement of the excitation signal required by the angle sensor, converting the excitation signal into an analog signal through a DA conversion circuit, obtaining a new sinusoidal signal after subtracting the analog sinusoidal signal from a reference variable voltage, realizing signal inversion through an operational amplifier, and finally obtaining the required excitation signal.

The signal generating circuit of the invention is shown in fig. 2, wherein D1 is a CPLD chip, D2 is a digital-to-analog conversion chip, N1 is an operational amplifier, R32, R33, R34, R35, R36, R37 are resistors, and C27 is a capacitor. In the circuit, R32, R33, R34, R35, R36 and R37 are matched resistors of an amplifying circuit and are used for determining the proportional relation between input and output. The capacitor is a direct current resistance capacitor, and direct current signals are prevented from passing through the capacitor. The angle sensor needs to return angle information and needs a sinusoidal excitation signal with the frequency of 2K and the peak value of-3.25V to 3.25V. And programming and outputting a digital signal of a sine waveform required by the angle sensor through the CPLD. And then, the CPLD controls the DA conversion chip DAC7512 to convert the digital signal into a sinusoidal waveform with the output frequency of 2k and the peak value from 3.951V to 1.08V, the sinusoidal waveform is converted by an N1A circuit and then is output into a sinusoidal signal Z1 with the frequency of 2k and the peak value from 3.951V to 1.08V, and the sinusoidal signal Z1 has the driving capability through an N1A circuit. After the conversion of the N1B circuit, a sinusoidal signal Z2 is output, Z2 is equal to 2 times of 2.5V standard voltage minus Z1, and the output signal is opposite to Z1. The angle sensor is supplied by the Z1 and the Z2 together, and an accurate excitation signal is obtained. The design can accurately provide an excitation signal for the angle sensor, so that the angle sensor works, a sin value and a cos value which return to the current angle are stored in the DSP, the angle is resolved, and the angle feedback of the angle sensor is completed.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.