Digital switch power amplifier for magnetic suspension flywheel magnetic bearing system

A technology of power amplifier and digital switch, which is applied in control/regulation system, output power conversion device, DC power input conversion to DC power output, etc. It can solve the problems of poor reliability of optocoupler devices, waste of resources, and reduced reliability. , to achieve the effects of reducing coil current ripple, rich IO resources, and improving reliability

Active Publication Date: 2007-04-18
BEIHANG UNIV
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Problems solved by technology

Switching power amplifiers based on analog devices have low integration, high power consumption, and inflexible pulse width modulation methods, while switching power amplifiers based on single-chip DSP have a limited number of PWM signal outputs. Multi-chips are required to complete multi-channel control. DSP, resulting in reduced reliability, waste of resources, and fixed PWM modulation, so the magnetic bearing switching power amplifier

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  • Digital switch power amplifier for magnetic suspension flywheel magnetic bearing system
  • Digital switch power amplifier for magnetic suspension flywheel magnetic bearing system
  • Digital switch power amplifier for magnetic suspension flywheel magnetic bearing system

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Embodiment Construction

[0030] As shown in Figure 1, the general structure of the switching power amplifier used in the existing magnetic bearing system is given. The pulse width modulation signal generating circuit generates a PWM signal according to the current given signal and the current feedback signal. The PWM signal is isolated by an optocoupler and driven by a switch. The circuit generates the gate drive signal of the power switch tube of the full bridge main circuit, the power switch tube of the full bridge main circuit is turned on and off under the control of the gate drive signal, and the corresponding required current is generated in the coil, and the current isolation detection circuit The detection of the coil current signal is completed.

[0031] As shown in Figure 2, the hardware of the present invention mainly includes FPGA1, isolation drive circuit 2, full bridge main circuit 3, current detection circuit 4, conditioning circuit 5, A / D chip 6 and overcurrent detection circuit 7, FPGA...

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Abstract

The invention is a digital switching power amplifier for magnetic bearing system of magnetic suspension flywheel, a device for actively controlling the current in the magnetic bearing coil, mainly comprising FPGA, isolated driving circuits, full-bridge main circuit, current detection circuit, conditioning circuit, A/D chip and overcurrent detection circuit. And the digital switch power amplifier makes PWM modulation by the error signal formed by the FPGA according to the given digital control quantity and sampling result of current feedback signal, directly control ON and OFF of power switches in the full bridge main circuit by the ready- modulated PWM signals through the isolated driving circuits, so as to achieve the purpose of controlling the current in the magnetic bearing coil. And the invention has advantages of simple structure and high reliability.

Description

technical field [0001] The invention relates to a digital switch power amplifier for a magnetic bearing system of a magnetic suspension flywheel, which is used for controlling the output current of the magnetic bearing coil of the magnetic suspension flywheel. Background technique [0002] The flywheel is the basic attitude control actuator on small and medium-sized satellites with stable three-axis attitude. Compared with the traditional mechanical bearing flywheel, the magnetic levitation flywheel has the advantages of no speed, zero friction and active vibration control. Therefore, it has the advantages of high-precision satellites. Broad application prospects. In addition, the magnetic bearing has no friction, which avoids the wear of the mechanical bearing itself due to friction. Its reliability depends on the reliability of the electronic components of the control system, so it has a longer service life than the mechanical bearing flywheel. [0003] As the actuator of...

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Application Information

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IPC IPC(8): H02M3/155H02M3/156G05F1/56
Inventor 房建成刘虎刘刚韩辅君张亮
Owner BEIHANG UNIV
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