CN-122021674-A - Non-common ground attack angle signal acquisition and calculation circuit and method

CN122021674ACN 122021674 ACN122021674 ACN 122021674ACN-122021674-A

Abstract

The invention provides an attack angle signal acquisition and solving circuit and method without common ground, comprising a step-down follower circuit, an isolation operational amplifier circuit, an isolation power supply circuit and an A/D acquisition and MCU solving circuit; the voltage reduction following circuit comprises an isolation operational amplifier circuit, an A/D acquisition and MCU (micro control unit) solver circuit, an isolation power supply circuit, an A/D acquisition and MCU solver circuit and a voltage reduction follow circuit, wherein the isolation operational amplifier circuit is used for isolating and acquiring a tap voltage signal and an excitation positive voltage signal which are output by an attack angle alarm system of the voltage reduction follow circuit and outputting the tap voltage signal and the excitation positive voltage signal to the A/D acquisition and MCU solver circuit, the isolation power supply circuit provides reference voltages for the input ends of the voltage reduction follow circuit and the isolation operational amplifier circuit, the output end reference voltages of the isolation operational amplifier circuit are connected to the A/D acquisition and MCU solver circuit, and the A/D acquisition and MCU solver circuit is used for carrying out the solution of local attack angles and true attack angles and can effectively acquire attack angle signals which are not commonly grounded under the condition that an original system is not affected.

Inventors

GAO ZHIWEI
LI YUEKUN
YANG PENGZUN
XI ZHIXING
WANG HAOYUE

Assignees

太原航空仪表有限公司

Dates

Publication Date: 20260512
Application Date: 20251227

Claims (9)

1. The attack angle signal acquisition and solving circuit without common ground is characterized by comprising a step-down follower circuit, an isolation operational amplifier circuit, an isolation power supply circuit and an A/D acquisition and MCU solving circuit; The step-down follower circuit comprises two step-down circuits and two operational amplifiers, wherein the step-down follower circuit is used for reducing an excitation positive voltage signal U Excitation positive 1 and a tap voltage signal U Tap head 1 which are output by the attack angle alarm system according to a preset proportion, and the operational amplifiers are used for forming the step-down follower circuit to output the excitation positive voltage signal U Excitation positive 2 and the tap voltage signal U Tap head 2 after step-down; The isolation operational amplifier comprises two paths of isolation operational amplifiers, wherein the input ends of the two paths of isolation operational amplifiers are respectively connected with U Excitation positive 2 and U Tap head 2 provided by the step-down follower circuit, and the output ends U Excitation positive 3 and U Tap head 3 are connected with the A/D acquisition and MCU calculation circuit; The output end GND 3 of the isolation power supply circuit is connected with the U Exciting negative 1 of the attack angle alarm system, and the isolation power supply circuit is used for providing reference voltage V + 、V - 、GND 3 for the reference voltages of the input ends of the step-down follower circuit and the two paths of isolation operational amplifiers; The A/D acquisition and MCU resolving circuit comprises an MCU chip and an A/D acquisition chip, wherein the MCU chip is used for acquiring and isolating an excitation positive voltage signal and a tap voltage signal which are output by the operational amplifier circuit and inputting the signals to the MCU for resolving a local attack angle and a true attack angle.
2. The non-common-ground angle of attack signal acquisition solver of claim 1 wherein the maximum input voltage of the buck follower is greater than 20% of the maximum output value of the angle of attack alarm system.
3. The non-common ground attack angle signal acquisition and calculation circuit according to claim 1, wherein the MCU chip calculates the local attack angle by the following formula (1) The true attack angle is calculated by adopting the following formula (2) : (1) (2) Where m is a scaling factor of tap voltage and local attack angle, n is a local attack angle compensation factor, m 1 is a scaling factor of local attack angle and true attack angle, and n 1 is a true attack angle compensation factor.
4. The non-common-ground angle of attack signal acquisition solver of claim 1 wherein the isolated power supply circuit has inputs receiving external VCC and GND.
5. The non-common-ground angle of attack signal acquisition solver of claim 1 wherein the input impedance of the two operational amplifiers of the buck follower reaches the G ohm level.
6. The non-common-ground attack angle signal acquisition and resolution circuit according to claim 1, wherein the two-way voltage reduction circuit of the voltage reduction follower circuit has a resistance value of up to M ohm.
7. A non-common-ground attack angle signal acquisition and resolution method, characterized in that the non-common-ground attack angle signal acquisition and resolution circuit is adopted.
8. A computer readable storage medium comprising a memory and a processor; the memory is configured to hold executable instructions; the processor is configured to implement the method of claim 7 when executing the executable instructions held by the memory.
9. A computer program product comprising instructions which, when executed by a computer, implement the method of claim 7.

Description

Non-common ground attack angle signal acquisition and calculation circuit and method Technical Field The invention belongs to the technical field of aircraft attack angle signal acquisition, and particularly relates to an attack angle signal acquisition and calculation circuit and method without common ground. Background The attack angle is an important index for representing the flight state of an airplane in the aviation field, and represents the included angle between a chord line of a wing and the windward airflow. Correctly capturing and outputting the angle of attack to the display system of the aircraft is critical to flight safety. However, due to the difference of the power supply characteristics of the aircraft, the attack angle signal of the attack angle warning system is often not a standard direct current signal, but a pulsating direct current wave rectified by an alternating current signal. Because the attack angle warning system can only give an excitation positive signal, an excitation negative signal (the excitation negative signal is not referenced to the ground) and a tap signal, the attack angle signal is collected by the traditional method, the differential operational amplifier is often used for collecting the excitation positive signal and the tap signal to complete attack angle calculation, but the differential mode voltage collected by the differential operational amplifier can not avoid the problem of non-common ground all the time, so that common mode interference always exists in the collection process to cause larger collection error, and common mode voltage is uncertain due to the non-common ground cause, the condition that the collection voltage exceeds the common mode voltage input range, the operational amplifier is saturated or even damaged easily during collection, and the final collection result is invalid is caused. In addition, as the attack angle warning system (high-pressure side) directly outputs signals to the attack angle resolving system (low-pressure side) for calculation when the traditional method is adopted for collection, the attack angle resolving system (low-pressure side) has the risk of high-pressure channeling, and the safety of the attack angle resolving system also has a larger problem. Disclosure of Invention The invention provides a non-common-ground attack angle signal acquisition and calculation circuit and a non-common-ground attack angle signal acquisition and calculation method, which can effectively acquire non-common-ground attack angle signals under the condition of not affecting an original system. The first aspect of the invention provides an attack angle signal acquisition and resolving circuit which is not commonly grounded, comprising a step-down follower circuit, an isolation operational amplifier circuit, an isolation power supply circuit and an A/D acquisition and MCU resolving circuit; The step-down follower circuit comprises two step-down circuits and two operational amplifiers, wherein the step-down follower circuit is used for reducing an excitation positive voltage signal U Excitation positive 1 and a tap voltage signal U Tap head 1 which are output by the attack angle alarm system according to a preset proportion, and the operational amplifiers are used for forming the step-down follower circuit to output the excitation positive voltage signal U Excitation positive 2 and the tap voltage signal U Tap head 2 after step-down; The isolation operational amplifier comprises two paths of isolation operational amplifiers, wherein the input ends of the two paths of isolation operational amplifiers are respectively connected with U Excitation positive 2 and U Tap head 2 provided by the step-down follower circuit, and the output ends U Excitation positive 3 and U Tap head 3 are connected with the A/D acquisition and MCU calculation circuit; The output end GND 3 of the isolation power supply circuit is connected with the U Exciting negative 1 of the attack angle alarm system, and the isolation power supply circuit is used for providing reference voltage V +、V-、GND3 for the reference voltages of the input ends of the step-down follower circuit and the two paths of isolation operational amplifiers; The A/D acquisition and MCU resolving circuit comprises an MCU chip and an A/D acquisition chip, wherein the MCU chip is used for acquiring and isolating an excitation positive voltage signal and a tap voltage signal which are output by the operational amplifier circuit and inputting the signals to the MCU for resolving a local attack angle and a true attack angle. Optionally, the maximum input voltage of the step-down follower circuit is greater than 20% of the maximum output value of the attack angle warning system. Optionally, the MCU chip adopts the following formula (1) to calculate the local attack angleThe true attack angle is calculated by adopting the following formula (2): (1) (2) Where m is a scaling factor of tap voltage and lo