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Alternating current servo drive major loop based on three-electrical-level MOSFET

A technology of AC servo and main circuit, applied in the field of servo drive, can solve the problems of poor withstand voltage performance, high withstand voltage, slow switching speed, etc., and achieve the effects of improving overall performance, preventing insulation breakdown, and reducing motor temperature rise

Inactive Publication Date: 2018-01-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The AC servo drive main circuit in IGBT mode has high withstand voltage, but the switching speed is slow, while the AC servo drive main circuit in MOSFET mode has fast switching speed, but poor withstand voltage performance

Method used

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  • Alternating current servo drive major loop based on three-electrical-level MOSFET
  • Alternating current servo drive major loop based on three-electrical-level MOSFET
  • Alternating current servo drive major loop based on three-electrical-level MOSFET

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Embodiment Construction

[0011] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0012] Such as figure 2 As shown, it is a functional block diagram of an embodiment of the MOSFET three-level AC servo drive main circuit of the present invention. The main driving circuit of the server in this embodiment includes a rectifying circuit 1 , a driving circuit 3 and an inverter circuit 2 . Among them, rectifier circuit 1 converts AC input (such as 220V\50Hz, 380V\50Hz) into DC output to the capacitors at both ends of PN, inverter circuit 2 is a three-phase three-level full-bridge inverter circuit, and the input is connected to busbars P and N point, the drive circuit 3 generates twelve channels of PWM signals and outputs them to the inverter circuit 2, and the inverter circuit 2 converts the DC into a con...

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Abstract

The invention discloses an alternating current servo drive major loop based on three electrical levels of an MOSEFT. According to the major loop, on the basis of the increased level number of a three-electrical-level MOSFET main circuit topological structure, the voltage waveform input by a motor is improved, the deformation of the motor voltage waveform is reduced, the harmonic wave of motor current is decreased, and temperature rise in the motor is reduced; meanwhile, the stress of a diode Du / a diode Dt, which is performed on switch devices, is greatly decreased, an insulated part of a motor rotor winding can be effectively prevented form being penetrated, and the EMI characters of an overall servo drive can be improved; the switching frequency reaches 50 KHZ, and the integral propertyof servo control is significantly improved, particularly the dynamic property and the velocity response bandwidth.

Description

technical field [0001] The invention relates to the field of servo drive, in particular to the main circuit of the servo drive, and more specifically, to an AC servo drive main circuit based on MOSFET three-level. Background technique [0002] With the development of robot and artificial intelligence technology, servo is one of the important actuators, and its performance directly determines the level of intelligent manufacturing. At present, the AC servo drive circuit is mainly composed of IGBT, metal oxide half-field-effect transistor MOSFET discrete devices or integrated IPM modules, and the main topology is a two-level three-phase inverter structure. figure 1 It is the topology circuit used by the current mainstream servo drive, where U, V, and W are the three drive power output terminals required by the motor. The AC servo drive main circuit in IGBT mode has high withstand voltage but slow switching speed, while the AC servo drive main circuit in metal oxide half field...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02M7/487
Inventor 尹泉李海春罗慧刘洋
Owner HUAZHONG UNIV OF SCI & TECH
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