Nonlinear power amplifier

Abstract

The invention discloses a digital nonlinear power amplifier which utilizes intelligent closed-loop control. Control signals pass through a digital module and the like and then are output by an output circuit and regulate current values generated by an upper coil and a lower coil of a differential electromagnet. Current feed back values are in two channels, one of the current feed back values is fed back to an output signal converter after real-time detections to perform fast protection for an output driving, and the other one of current feed back values and material parameters are input to a compensating parameter determining module. A position sensor signal feeds back collected signals to the compensating parameter determining module for centralized processing. And then a microprocessor in a system quickly finds compensating parameters in a nonlinear compensation database and overlays the compensating parameters to amplification signals to achieve nonlinear compensation amplification. The nonlinear power amplifier provides technical basis for the practical application of active magnetic levitation and a system controller can be a standard part. The nonlinear power amplifier can play a key role in the achievement of free debugging and mass industrial popularization and application of an active magnetic levitation system.

Description

technical field [0001] The invention belongs to the technical field of power amplifiers, in particular to a nonlinear power amplifier. Background technique [0002] Magnetic levitation technology has received more and more attention from the scientific and technological circles and industrial circles today. Because the magnetic levitation can make the rotating shaft rotate without contacting any external components, it has the advantages of small mechanical wear, low energy consumption, low noise, long life, no lubrication, no oil pollution, etc., especially suitable for special environments such as high speed, vacuum, and ultra-clean. It can be widely used in machining, turbomachinery, aerospace, vacuum technology, identification and testing of rotor dynamic characteristics, etc., and is recognized as a promising new type of bearing. [0003] Magnetic suspension bearings can be divided into active type and passive type according to the suspension method. In the field of m...

AI Technical Summary

Problems solved by technology

[0014] One is to establish a new balance point, that is, x>0, which will make the position of the balance point deviate from the center and reduce the clearance margin of the magnetic bearing. At the moment when the position deviates, the system accuracy will deteriorate;

[0015] Second, in the process of establishing a new equilibrium point, ix0+ix will change, and can only be increased to ix0+ix1 under the action of the position sensor deviation signal, so that the rotor shaft can establish a new balance under the overcurrent state point (also a free balance method), the increase of ix0+ix obviously sacrifices the dynamic range of the controller, which is not good for expanding the stable domain, and, How much the increase is related to the system gain

[0016]Obviously, it is difficult to expand the stability domain in the above two cases, which is also the difficulty encountered in the current research on improving the performance of active maglev systems

Images