Disturbance voltage attenuation device

A technology for interfering voltage and attenuating devices, which is applied to output power conversion devices, electrical components, etc., can solve the problems of transistor withstand voltage level limitation, insufficient, and unsatisfactory noise suppression effect, so as to reduce the volume and reduce the workload. , the effect of reducing manufacturing costs

Active Publication Date: 2009-09-09
XI AN JIAOTONG UNIV
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Problems solved by technology

The compensation method using active components such as transistors has strict restrictions on the withstand voltage level of transistors, and the noise suppression effect is not ideal
Therefore, although the existing technology has a certain suppression effect on the common mode voltage, it is not sufficient enough to completely eliminate the common mode voltage

Method used

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Embodiment Construction

[0017] see figure 1 , the present invention includes a passive LC filter device connected in series between the inverter and the active control circuit close to the output end of the inverter for the initial attenuation of the interference voltage, and a series connection between the passive LC filter and the motor It is an active closed-loop control circuit for dynamic tracking and compensation of disturbance voltage close to the AC input end of the motor.

[0018] see figure 2 , the passive LC filtering device of the present invention includes a differential mode filter connected to the output end of the inverter for limiting the overcurrent of the main circuit and a common mode filter connected to the differential mode filter;

[0019] The differential mode filter includes a differential mode inductor L DM and in parallel with the resistor R D , the differential mode filter is connected in series in the three-phase main circuit of the inverter AC output, the differentia...

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Abstract

A disturbance voltage attenuation device can lead high-frequency disturbance voltage in an inverter driving motor system to be obviously inhibited through adopting the effective connection of a passive LC filter network and an active closed loop control circuit. Meanwhile, the disturbance inhibition function of a passive wave filter ensures that the voltage withstand class of an active component is not required overhigh and the cost is lowered; and the closed loop control and the dynamic tracking compensation of the active circuit to the disturbance voltage also lead the design parameter and the volume of the passive component to be greatly reduced.

Description

technical field [0001] The invention belongs to the field of power electronics research, in particular to an interference voltage attenuation device used for suppressing the AC output side of an inverter in an inverter-driven motor system. Background technique [0002] At the same time that power electronic devices are widely used and developed rapidly, electromagnetic compatibility issues are gradually being paid attention to. In the AC motor system driven by the inverter, the output voltage and current of the inverter change sharply due to the high-speed switching characteristics of the IGBT, and the output of the inverter contains a high common-mode voltage, which forms shaft voltage and shaft current, causing a series of adverse effects. At present, widely used passive suppression methods such as reactors and capacitors are generally too large in size. The compensation method using active components such as transistors has strict restrictions on the withstand voltage l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/44
Inventor 陈文洁杨旭王跃王兆安
Owner XI AN JIAOTONG UNIV
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