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Five-level multi-bridge-arm switching power amplifier circuit

A power amplifier circuit and multi-arm technology, applied in the field of magnetic bearings, can solve the problems of non-adjustable bus voltage, single, control current fluctuations, etc.

Pending Publication Date: 2021-03-12
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional magnetic bearing power amplifiers are two-level or three-level, and can only provide a single forward conduction voltage, reverse conduction voltage, or zero-voltage freewheeling state, a total of three levels
When the rotor keeps running stably, the required control current fluctuation is actually not large. The bus voltage of the traditional power amplifier cannot be adjusted, resulting in a large ripple when the power amplifier tracks the target current.

Method used

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  • Five-level multi-bridge-arm switching power amplifier circuit
  • Five-level multi-bridge-arm switching power amplifier circuit
  • Five-level multi-bridge-arm switching power amplifier circuit

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0020] Such as figure 1 A five-level multi-bridge switch power amplifier circuit shown is composed of an active neutral point clamp power supply, a main bridge arm, a five-phase load, and a load bridge arm. The active neutral point clamp power supply, the main bridge arm , five-phase load, and load bridge arms are electrically connected together in sequence;

[0021] The active neutral point clamp power supply is composed of a DC voltage source Udc, a voltage stabilizing capacitor C1 and a voltage stabilizing capacitor C2: the voltage stabilizing capacitor C1 and the voltage stabilizing capacitor C2 are connected in series and connected to both ends of the power supply Udc, the voltage stabilizing capacitor C1 and the voltage stabilizing capacitor The midpoint of the capacitor C2 is connected to the midpoint N3 of the main bridge arm;

[0022] Th...

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Abstract

The invention provides a five-level multi-bridge-arm switching power amplifier circuit which is composed of an active midpoint clamping power supply, a main bridge arm, a five-phase load and a load bridge arm, wherein the active midpoint clamping power supply, the main bridge arm, the five-phase load and the load bridge arm are electrically connected together in sequence. Through the design of thecircuit topology, the circuit can provide five levels, two of the five levels are forward half-voltage conduction and reverse half-voltage conduction, so that output waveform ripples are smaller whenthe power amplifier tracks more stable signals, and the power amplifier can be used in a magnetic suspension bearing.

Description

technical field [0001] The invention relates to a power amplifier circuit, in particular to a multi-bridge arm switch power amplifier circuit, which belongs to the technical field of magnetic bearings. Background technique [0002] Magnetic bearing (Magnetic Bearing) is a mechanical device that uses electromagnetic force to make the rotor and stator run without contact. Since there is no contact between the stator and the rotor, there is no friction loss during operation, so it can run stably at a high speed, and will not suffer from wear and tear like traditional bearings. It is very suitable for nuclear power facilities and other occasions that pursue high stability. At the same time, the magnetic bearing does not need lubrication, so the motor using the magnetic bearing does not need lubricating oil and will not cause pollution, which meets the needs of some clean workshops and production lines. In short, the excellent characteristics of magnetic bearings make them highl...

Claims

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Application Information

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IPC IPC(8): H03F3/21H02M7/487
CPCH03F3/21H02M7/487
Inventor 刘程子湛江杨艳刘泽远
Owner NANJING UNIV OF POSTS & TELECOMM
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