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Protection method and detection device of electric drive traction system

A traction system and detection device technology, which is applied in the direction of emergency protection circuit devices, measuring devices, and testing electrical devices in transportation, etc., can solve the problems of traction control unit inability to distinguish, fault expansion, fault misjudgment, etc., to reduce detection Design cost, reduced complexity, and high portability

Pending Publication Date: 2021-01-22
CRRC YONGJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The driving circuit has the function of short-circuit detection and protection of the power switch tube. As the traction control unit, it only judges whether there is a fault by receiving the fault signal of the driving circuit, and then performs protection actions; Discrimination can easily lead to further expansion of faults or misjudgment of faults

Method used

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  • Protection method and detection device of electric drive traction system
  • Protection method and detection device of electric drive traction system

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Embodiment Construction

[0044] A detection device for an electric drive traction system, comprising a traction control unit and a traction power unit;

[0045] The traction control unit includes a main control chip, a PWM pulse generation and detection judgment module, a PWM output module, and a signal receiving module; the main control chip sends data to the PWM pulse generation and detection judgment module, and the PWM output module outputs six PWM pulses, respectively: PWM1 , PWM2, PWM3, PWM4, PWM5, PWM6;

[0046] The traction power unit includes three bridge arms, and each bridge arm is divided into an upper bridge arm IGBT and a lower bridge arm IGBT; the upper bridge arm IGBT and the lower bridge arm IGBT of each bridge arm are respectively connected to a driving circuit;

[0047] The connection points of the upper bridge arm IGBT1 of the first bridge arm and its corresponding drive circuit one correspond to c1, g1, e1, and the connection points of the lower bridge arm IGBT2 of the first bridg...

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Abstract

The invention relates to an electric transmission traction system, in particular to a protection method and a detection device of an electric transmission traction system. The defects in the prior artare overcome. Whether the action of a power switch tube is consistent with that of a control PWM signal or not is judged through the PWM signal sent by a traction control unit and the feedback statesignal of the power switch tube; a PWM pulse output fault, a PWM pulse line fault, a driving circuit fault, a feedback line fault and a feedback signal receiving fault can be detected; the state of the loop in operation is monitored in real time; and the detection delay time can be set. According to the invention, the complexity of the system state test is reduced, the portability is high, and thedetection design cost is greatly reduced.

Description

technical field [0001] The invention relates to an electric drive traction system, in particular to a protection method and a detection device for the electric drive traction system, in particular to a protection method and a detection device for the electric drive traction system. Background technique [0002] In the electric drive traction system, the voltage source traction converter controlled by PWM is adopted. For the power switching device in the converter, the upper and lower power switching devices of the same bridge arm apply complementary driving signals. All devices have turn-on delay and turn-off delay, and the turn-on time is often shorter than the turn-off time, so it is easy to have a short-circuit fault in which two power switching devices of the same bridge arm are turned on at the same time. [0003] A blockage time must be introduced in the PWM control of the converter. At this time, both the upper and lower bridge arms block the drive signal to ensure th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/26G01R31/00H02H7/12
CPCG01R31/2617G01R31/005H02H7/12
Inventor 杨高兴路瑶张吉斌张瑞峰柴璐军牛剑博
Owner CRRC YONGJI ELECTRIC CO LTD