Electromagnetic bearing switching power amplifier for modular series

Abstract

The invention discloses an electromagnetic bearing switching power amplifier for modular series. The electromagnetic bearing switching power amplifier comprises a digital controller, a current sensor, a signal conditioning circuit and at least one power module; two ends of the power modules connected in series in a modular way are used as voltage input ends; after being connected in series, the current sensor and a load are used as an output end connected in the power modules; the output end of the current sensor is connected with the digital controller through the signal conditioning circuit; the digital controller is connected to various power modules, and controls connection among the various power modules and the internal conduction state of each power module; and thus, the performance and the requirement of the portability of the switching power amplifier are achieved. The electromagnetic bearing switching power amplifier can be flexibly selected and put into use; the optimal performance of the switching power amplifier is realized; the power modules are uniformly designed and convenient to replace; faults can be simply removed; compared with a power amplification device using a high-voltage device, the working efficiency of the switching power amplifier used in a low-voltage working occasion is relatively high; and the loss is relatively low.

Description

technical field [0001] The invention relates to a switching device, in particular to a switching power amplifier for a modular series electromagnetic bearing, which belongs to the technical field of switching power amplifiers for electromagnetic bearings. Background technique [0002] In order to make the rotor system of the rotating machine supported on the electromagnetic bearing have good performance, there is an urgent need for a power amplifier with high efficiency, wide operating frequency band, and large current output capability. Because the semiconductor power switching device of the switching power amplifier works in the switching state, the loss is small, and the power level of the device is also high, so it is widely used in the electromagnetic bearing system at present. [0003] There are two common main circuits of switching power amplifiers: one is a half-bridge structure that uses semiconductor power switching devices and diodes for complementary conduction; ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a switching power amplifier for electromagnetic bearings used in modular series connection, which can realize modular series connection through external simple wiring and digital controller control of electromagnetic relays, solving the problem of traditional The switching power amplifier has the disadvantages of slow response, poor portability, and difficult troubleshooting.

Images