Three-level switch power amplifier

A technology for switching power and amplifiers, which is applied in the field of three-level switching power amplifiers and can solve the problems of large current ripple and limited dynamic characteristics.

Active Publication Date: 2015-09-23
XJ POWER CO LTD +3
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  • Summary
  • 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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Embodiment Construction

[0019] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0020] Such as figure 1 Shown is the schematic diagram of the embodiment of the three-level switching 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 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 The role of the peak of the power 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 ...

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Abstract

The invention discloses a three-level switch power amplifier. A control and adjusting circuit of the three-level switch power amplifier comprises an upper bridge switch tube drive signal generating circuit and a lower bridge switch tube drive signal generating circuit. A current feedback signal of a bearing coil passes through a PI adjusting circuit with a given signal to obtain an error signal on one hand, and then enters into a PWM adjustor to form a drive signal of an upper bridge switch tube, and passes through the PI adjusting circuit with the given signal which passes through an amplification conditioning circuit to obtain the error signal, and then enters into the PWM adjustor to form a drive signal of a lower bridge switch tube on the other hand, and the drive signals pass through a pulse modulation circuit and a driver and separation circuit to directly control the open and the close of the power tubes in a power switch bridge circuit, thereby achieving the goal of controlling the current of an electromagnet bearing coil.

Description

technical field [0001] The invention belongs to the field of switching power amplifiers, in particular to a three-level switching 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 shortcomings of linear power ampl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/217
CPCH03F3/2173
Inventor 尹强常志国陈天锦任晓丹庞浩罗治军王宁于越刘秀华陈俊凯
Owner XJ POWER CO LTD
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