JPS61157256A - Gto destruction detecting system - Google Patents

Abstract

PURPOSE:To expedite the recovery of a controller by discriminating the destruction of a GTO by detecting a gate current of the GTO. CONSTITUTION:A controller for a vehicle has an inverter formed of GTOs 6, 7 through a current collector 2 from a trolley wire 1, a line breaker 3, a filter reactor 4 and a capacitor 5, controls it by gate circuits 11, 12 to drive an induction motor 10. In this case, detectors 13, 14 for detecting a current flowed to the gates of GTOs 6, 7 are provided. Thus, if the GTOs 6, 7 are damaged or shortcircuited by a turn OFF failure, excess currents flow to the gate circuits 11, 12. The excess currents are detected by the detectors 13, 14 to detect the destruction of the GTOs 6, 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to, for example, a vehicle control device using a GTO, and particularly to detection of destruction of the GTO, which is a main element thereof.

[Conventional technology]

FIG. 2 shows a simplified diagram of the main circuit of a vehicle inverter device using the conventional GTO destruction detection method. In the figure, m is an overhead wire, (2) is a current collector, (3) is a current interrupter, (4) is a filter reactor, (6) is a filter condenser, (6)
and (7) are GTO, and (8) is DCP for GTO destruction detection.
T, (9) is a limiting resistor for DCPT, and (101 is an induction motor.

Next, the operation will be explained. When the inverter is operating normally, GTO (ill and GTO (71) are turned on alternately and never turned on at the same time, so DCPTi
The detection voltage 81 is approximately equal to the power supply voltage.

If GTO1ff) is destroyed and short-circuited due to turn-off failure, GTO (6
1 and GTO (7) are short-circuited, and the output voltage of DCPT (81) decreases.

That is, conventionally, destruction of the GTO [61+7] was detected when the output voltage of the DCPT (8) became below a predetermined value.

[Problem that the invention seeks to solve]

Since the conventional GTO destruction detection system is configured as described above, it cannot be detected unless the GTO (7) turns on after the GTOtel is destroyed. That is, all GTOs are turned off when the inverter is stopped, but even if a GTO were to break down at this time, it could not be detected immediately. Therefore, even if the GTO is destroyed when the vehicle is stopped in the garage, it cannot be detected immediately, so there is a problem in that the abnormality is not known and recovery is delayed.

This invention was made in order to solve the above problems, and it is a GTO destruction detection system that can detect the destruction of GTO (61) even if GTO (7) does not turn on after GTO (61) is destroyed. The purpose is to obtain a method.

[Means for solving problems]

The GTO destruction detection method according to the present invention includes a detector that detects the gate current flowing out from the gate circuit of the GTO,
Destruction of the pGTO is detected based on the current value.

[For production]

The gate current detector in the present invention detects abnormal current flowing through the gate circuit when the GTO is destroyed.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) to (10) are similar to the conventional device described above. (1st and (1'4 case GTO181+7)
03) and (14) are GTO+61 gate circuits.
(7) This is a detector that detects the current flowing through the gate.

In the figure, when the GTO [61 is destroyed due to turn-off failure and short-circuited, the gate and cathode of the GTO (el) are also short-circuited, and an excessive current flows through the gate circuit (11). This excessive current is detected by the detector 03). and detects the destruction of GTOfi+.

In the GTO destruction detection method configured as above, destruction of the GTO can be detected by detecting excessive gate current at the time of GTO destruction.
The destruction of GTO[6j can be detected even if GTO+7) does not turn on after 61 is destroyed.

That is, even if the GTO is destroyed when the vehicle is stopped in the garage, the GTO destruction can be detected and restoration measures can be taken immediately.

In addition, in the above embodiment, a method of directly measuring abnormalities in the gate current of the GTO was shown, but it is also possible to detect the input current of the gate circuit using the correlation between the output current of the gate circuit and the input current. Good too.

Further, in the above embodiment, a vehicle inverter device using a GTO has been described, but by applying the present invention to a control device using another GTO, it is possible to detect the destruction of the GTO.

〔Effect of the invention〕

As described above, according to the present invention, the destruction of the GTO is determined by detecting the gate current of the GTO.
Destruction can be detected and the control device can be restored quickly.

[Brief explanation of drawings]

FIG. 1 is a simplified main circuit diagram of a vehicle inverter device according to an embodiment of the present invention, and FIG. 2 is a main circuit diagram of a conventional vehicle inverter device. In the figure, (6) and (7
) is GTOl, (kawa and (12) are GTO gate circuits,
0 gon and +14) Vi detector. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A GTO destruction detection method for turning on and turning off a gate turn-off thyristor (GTO), which includes a detector that detects a gate current flowing into the GTO, and determines destruction of the GTO based on the value of the gate current.