Low-ripple switch power amplifier for permanent magnet biased electromagnetic-bearing

A technology of electromagnetic bearing and switching power, applied in the direction of holding device, bearing, shaft and bearing with magnetic attraction or thrust, which can solve the problem of increasing switching loss, large iron loss and copper loss of electromagnetic bearing, large output current ripple, etc. problem, to achieve the effect of reducing output current ripple, flexible waveform generation, and simple circuit design

CN1710799AInactive Publication Date: 2005-12-21BEIHANG UNIV
0 Cites 41 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2005-12-21
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invented equipment is in use for controlling current in load coil of electromagnet bearing. The switching power amplifier includes circuit for generating signal of pulse width modulation (PWM), light coupling isolation and switching drive circuit, main circuit of full bridge and current testing circuit. Based on error signal formed from specified signal of current and feedback signal of current, the switching power amplifier carries out PWM. Through light coupling isolation and switching drive circuit, completed PWM signal controls and turns to On / Off of four pieces of power switch tube on two bridge arms of main circuit of full bridge directly. The invention lowers wastage in electromagnet bearing caused by current ripple.
Need to check novelty before this filing date? Find Prior Art

Description

Technical field

[0001] The invention relates to a low-ripple switching power amplifier for permanent magnet bias electromagnetic bearings, which is used to control the output current of the electromagnetic bearing coils. Background technique

[0002] Electromagnetic bearing is a high-tech electromechanical integration product, which has the advantages of high speed, no friction, long life, no lubrication, no pollution, etc. It has broad application prospects in aerospace, turbomachinery, vacuum technology and high-speed machine tools. . As the actuator of the electromagnetic bearing control system, the power amplifier consumes the most energy. Reducing its power consumption and improving energy conversion efficiency is one of the main purposes of power amplifier design, and it is also the problem that the electromagnetic bearing control system needs to solve to achieve low power consumption. One of the key technologies.

[0003] The permanent magnet bias electromagnetic be...

Examples

Embodiment Construction

[0012] The block diagram of the circuit structure of the present invention is as figure 1 As shown, it can be divided into four parts, namely pulse width modulation signal generation circuit, optocoupler isolation and switch drive circuit, full bridge main circuit and current detection circuit. The pulse width modulation signal generating circuit is a key component of the present invention, and the present invention is realized by using analog circuits and digital circuits made up of discrete components, and can also be digitally realized by software programming. The optocoupler isolation circuit uses chip 6N137, and the switch drive circuit uses chip IR2110. The current detection circuit adopts the current sensor LA28-NP of LEM Company.

[0013] The following is attached figure 2 , the principle of the PWM modulation circuit adopted in the present invention will be described.

[0014] For the electromagnetic bearing switching power amplifier, through the four power switch...