Zero drift automatic adjustment system and method

Abstract

The invention provides a zero drift automatic adjustment system and method, which are used for zero drift adjustment of a power amplification circuit. The automatic adjustment system comprises a maincontrol CPU, a power amplifier, an A / D converter and a digital potentiometer. The automatic adjustment method comprises the steps that when an input signal is zero, the input signal is amplified and output by a power amplifier and then input into an A / D converter; the power amplification output signal is input into a main control CPU after being digitally acquired by the A / D converter; after the main control CPU judges the power amplification output signal, the output value of a digital potentiometer connected with the main control CPU is set according to the output signal value; and the output of the digital potentiometer is connected with the feedback end of the power amplifier, and the output value of the digital potentiometer is adjusted through the main control CPU to change the amplification output of the power amplifier until the output value of the power amplifier is zero, so that the automatic adjustment process of zero drift of the power amplifier is achieved.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a zero drift automatic adjustment system and method. Background technique [0002] In the field of electronic control technology, when designing power amplifiers, many integrated operational amplifiers are often used in combination to modulate low-voltage and small-current signals into high-voltage and strong-current signals to realize the functions of device driving and power amplification. corresponding control purpose. After the power amplifier composed of these operational amplifiers works for a long period of time, affected by the offset voltage and offset current, the control accuracy and control accuracy may have a certain degree of deviation, and the corresponding terminal output signal may cause Abnormal control and abnormal AD sampling occur in the post-stage circuit of the power amplifier. Therefore, relevant auxiliary function circuits should be installed in the ...

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Problems solved by technology

[0004] Although the above methods have been proved to be feasible by the actual application of the circuit, there are still the following problems: the functions of electronic integrated equipment are becoming more and more complex and diversified, and the complexity of the technology and structure is increasing day by day. Detection and maintenance methods can no longer meet the support and guarantee requirements of modern automatic control systems

When the equipment is installed on a fixed carrier or installed in a limited space, it becomes extremely difficult to disassemble, adjust resistance, and improve zero drift

For the delivered electronic integrated equipment, if the operation of the existing equipment is terminated in order to adjust the zero drift, it will also affect the work of the peripheral large system

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