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High-stability and high-precision current source circuit

A high-precision, current source technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of poor current accuracy, unstable output current range, long response time, etc., to improve control accuracy and efficiency. , the effect of high-precision current source output

Inactive Publication Date: 2018-06-29
XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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  • Summary
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AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose a high-stable and high-precision current source circuit to solve the problems of unstable output small current domain, poor current accuracy, long response time, etc.

Method used

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  • High-stability and high-precision current source circuit

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Embodiment Construction

[0013] The output terminal of the D / A converter is connected in series with resistors R1 and R2 to AGND. When the D / A converter outputs the voltage Uin, a voltage U1+=Uin*(R2 / (R1+R2)) will be generated at the connection point between R1 and R2.

[0014] The negative terminal of the first operational amplifier OP1 is connected to the connection point of the resistors R1 and R2. The positive terminal of the first operational amplifier OP1 is divided into two circuits, one is connected to AGND through the resistor R3, and the other is connected to the drain of the first field effect transistor V1 to form a positive feedback connection to generate a voltage U1-. The output end of the first operational amplifier OP1 is connected to the gate of the first field effect transistor V1. The negative feedback circuit jointly formed by OP1 and V1 makes U1+=U1-, and then I2=U1- / R3=U1+ / R3. Because the first operational amplifier OP1 is positive feedback connection, the settling time of U1-...

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Abstract

The invention belongs to the field of on-board computer interfaces, and relates to a high-stability and high-precision current source circuit. The current source circuit includes a D / A converter, a first operational amplifier OP1, a second operational amplifier OP2, a first field effect transistor V1, a second field effect transistor V2 and a diode V3. The diode V3 is located among the second operational amplifier OP2, the resistor R4 and a power supply +15V, so that the second operational amplifier OP2 avoids a nonlinear region when the circuit outputs small current. The connection mode of the first operational amplifier OP1 is a positive feedback mode, and the output end of the first operational amplifier OP1 is connected with the first field effect transistor V1.

Description

technical field [0001] The technology belongs to the field of airborne computer interface, and relates to a high-stable and high-precision current source circuit. Background technique [0002] With the development of a series of domestic small aircraft, especially unmanned aerial vehicles, the structural design of the aircraft is getting smaller and smaller. In order to effectively reduce the size and weight of the aircraft, the landing gear system is realized by a device with a relatively compact structure, which directly causes the aircraft wheel And the area of ​​the brake pads of the aircraft and the wheel is reduced, and the braking efficiency is reduced. The requirements for the accuracy and efficiency of the aircraft braking control system are getting higher and higher. This requires the brake system to have higher control precision and faster control speed of the pressure servo valve. [0003] The pressure servo valve used in the airborne actuator is driven by curre...

Claims

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Application Information

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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 刘炜吕俊王晓勇张晓敏於二军惠亮
Owner XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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