A three-level pulse width modulation method and related equipment

Abstract

The application discloses a magnetic levitation coil control system and its three-level pulse width modulation method, device, controller and computer-readable storage medium. The three-level pulse width modulation method is applied to a half-bridge topology circuit, including: determining and The equivalent output duty ratio corresponding to the average output voltage setting value; determining the output duration reference parameter; based on the equivalent output duty ratio and the output duration reference parameter, determining the corresponding target duty ratio and target phase shift angle; the output duty ratio is the first control signal of the target duty ratio to the control terminal of the first switching tube in the half-bridge topology circuit; the output duty ratio is the second control signal of the target duty ratio The signal is sent to the control terminal of the second switching tube in the half-bridge topology circuit; the phase delay angle of the second control signal relative to the first control signal is the target phase shift angle. This application is based on the coordinated dynamic modulation of the duty cycle and the phase shift angle, which can effectively reduce the current ripple and increase the current bandwidth.

Description

Technical field [0001] The present application relates to the field of electrical control technology, and more particularly to a magnetic suspension coil control system and a three-level pulse width modulation method, a device, a controller, and a computer readable storage medium. Background technique [0002] Magnetic levitation control is the principle of generating suction when the magnetic field is passed through the surface of different media, indirectly controls the size of the magnetic field suction by controlling the current of the magnetic suspension coil, thereby suspending the controlled object in a fixed position. Generally, the magnetic levitation bearing generally employs the upper and lower coil current difference control method, so that the electromagnetic force control in the positive and reverse direction is realized, so for a single magnetic suspension coil, there is no need to change the current direction, only the unipolar current control is required. [0003...

AI Technical Summary

Problems solved by technology

However, most of the traditional three-level modulation methods use a modulation method with a fixed phase difference and a dynamically changing duty cycle, which makes the current ripple of the magnetic levitation coil larger and the current bandwidth smaller.

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