Fault detection method for three-phase full-bridge inverter

A three-phase full-bridge and fault detection technology, which is applied in the direction of instruments, measuring electronics, and measuring devices, can solve the problems that three-phase inverters cannot detect faults, etc.

Active Publication Date: 2021-01-15
BEIJING AUTOMATION CONTROL EQUIP INST
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Problems solved by technology

[0005] Aiming at the technical problem that the three-phase inverter in the prior art cannot perform fault detection in the static state of the motor, the present invention provides a static fault detection method for the three-phase full-bridge inverter, which detects the fault without the continuous rotation of the motor Fault status of three-phase inverter

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  • Fault detection method for three-phase full-bridge inverter
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  • Fault detection method for three-phase full-bridge inverter

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[0028]Specific embodiments of the present invention will be described in detail below. In the following description, for the purpose of explanation and not limitation, specific details are set forth to help a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can also be practiced in other embodiments that depart from these specific details.

[0029]It should be noted here that in order to avoid obscuring the present invention due to unnecessary details, only the device structure and / or processing steps closely related to the solution according to the present invention are shown in the drawings, and the present invention is omitted. Invent other details that are not relevant.

[0030]Such asfigure 1 Shown is the circuit structure of a typical three-phase inverter to drive a motor, including power supply, current sensor, voltage sensor, three-phase inverter, motor and other components. The power supply provide...

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Abstract

The invention provides a three-phase full-bridge inverter fault detection method, and the method comprises the steps: taking a three-phase current sensor and a power supply voltage sensor as detectionsignal sources, and adopting six groups of different vector energization strategies as detection methods for a three-phase winding star-shaped connection motor load; calculating average phase currentand power supply voltage of each group of power-on strategies by acquiring A, B and C three-phase current and power supply voltage in real time, and then respectively judging the fault state of the three-phase full-bridge inverter by designing reasonable current upper and lower limit thresholds and voltage lower limit thresholds. Compared with dynamic detection in the conventional motor operationprocess, the method can judge the operation state of the three-phase full-bridge inverter under the condition that the motor does not rotate obviously, and is suitable for static detection under thestatic condition of the motor.

Description

Technical field[0001]The invention belongs to the technical field of fault detection, and specifically relates to a fault detection method for a three-phase full-bridge inverter.Background technique[0002]Three-phase motor drive systems are widely used in aerospace, electric vehicles and other fields, and their reliability directly determines product life and performance. The three-phase motor drive system is mainly composed of motors, inverters, controllers and sensors. The inverter plays an important role in inverting the DC power supply into AC power with controllable amplitude and phase. High voltage, high current and electric pulse load are the weak links that are prone to failure in the three-phase motor drive system. Its reliability and operating status are very important to the entire drive system.[0003]Take the engine electric fuel pump speed control system as an example. It uses a permanent magnet motor to drive the gear pump to rotate at a high speed to achieve precise flo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R19/00
CPCG01R31/00G01R19/00Y04S10/52
Inventor 吴雪琴张新华黄建张兆凯王天乙王京伟张鑫王贯翟琨洋婷
Owner BEIJING AUTOMATION CONTROL EQUIP INST
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