Control method for three-level power amplifier

A technology of a power amplifier and a control method, which is applied in the directions of power amplifiers, improving amplifiers to improve efficiency, and improving amplifiers to reduce noise effects, etc. Simple structure and simple control method

Active Publication Date: 2015-11-11
XJ POWER CO LTD +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The earlier switching power amplifiers of magnetic suspension bearings all adopt the current two-level modulation technology, which has the disadvantages of large current ripple and limited dynamic characteristics, while the three-level modulation technology can effectively reduce the current ripple, reduce electromagnetic noise, and at the same time reduce the The copper loss of the coil is reduced, and it is also beneficial to improve the current response speed and control force response speed of the switching power amplifier, thereby improving the overall performance of the system

Method used

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  • Control method for three-level power amplifier
  • Control method for three-level power amplifier
  • Control method for three-level power amplifier

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Embodiment Construction

[0023] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as figure 1 Shown is the schematic diagram of the embodiment of the three-level power amplifier of the present invention. As can be seen from the figure, the amplifier includes a power switch bridge circuit and an electromagnetic bearing coil Lm connected between the two switch tubes. The power switch bridge circuit of the present embodiment The circuit is the main circuit of the half bridge, including the upper bridge switch tube Q1 and the lower bridge switch tube Q2, Q1 and Q2 are MOSFETs or IGBTs, D1 and D2 are power diodes, electrolytic capacitor E1 and non-inductive capacitor C1 are used to support the bus voltage and absorb power The role of the peak of the tube, Rm is the resistance of the electromagnetic axis coil, the current transformer is connected in series in the loop to sample the inductor current, and its current fe...

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Abstract

The invention discloses a control method for a three-level power amplifier. The power amplifier comprises a power switching bridge circuit with an upper bridge switching tube and a lower bridge switching tube, and an electromagnetic bearing coil Lm connected between the two switching tubes. The control method is characterized by comprising the following steps: (1) during charging, switching on/off the upper bridge switching tube under the control of a corresponding driving signal, and keeping the lower bridge switching tube in a switch-on state; and (2) during discharging, switching on/off the lower bridge switching tube under the control of a corresponding driving signal, and keeping the upper bridge switching tube in a switch-off state. According to the method, control over the current of the electromagnetic bearing coil is realized through adoption of different ways for adjusting the upper bridge switching tube and the lower bridge switching tube, so that a conventional way of controlling the upper and lower switching tubes with a phase inverter is changed, and the control way is simpler.

Description

technical field [0001] The invention belongs to the field of switching power amplifiers, and in particular relates to a control method for a three-level power amplifier. Background technique [0002] Traditional mechanical thrust bearings have defects such as friction, wear and the resulting temperature rise, which affect the speed and accuracy of rotating machinery. The magnetic suspension bearing uses magnetic force to suspend the rotor in the air, and then drives the rotor with a rotating motor to rotate around a specific axis. There is no contact between the rotor and the stator, no friction, long service life, no lubrication, and high precision. A new type of high performance bearing. [0003] In the five-degree-of-freedom magnetic suspension bearing control system, the power amplifier is a very important part of the magnetic suspension bearing control system. In the early days, electromagnetic bearing systems mostly used linear power amplifiers. Due to the shortcomin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F1/26H03F3/20
Inventor 尹强常志国陈天锦庞浩任晓丹罗治军王宁于越于海滨詹金果张岁峰张小广刘秀华陈俊凯
Owner XJ POWER CO LTD
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