KR101547676B1

KR101547676B1 - Capacitor Exchanging Type Gate Drive Unit

Info

Publication number: KR101547676B1
Application number: KR1020140108853A
Authority: KR
Inventors: 김성준
Original assignee: 한국철도공사
Priority date: 2014-08-21
Filing date: 2014-08-21
Publication date: 2015-08-26
Also published as: WO2016027916A1

Abstract

The present invention relates to a capacitor-exchangeable gate drive device for detachably manufacturing a capacitor module of a gate drive for driving a large-capacity semiconductor of an electric railway vehicle, and a driver PCB having a connection socket at an upper portion thereof. A capacitor PCB having a capacitor on an upper portion thereof and a connection pin electrically connected to the connection socket at a lower portion thereof and detachably attached to the driver PCB; And a gate control unit for receiving the smoothed signal through the capacitor PCB and switching the power semiconductor.
According to the capacitor-exchangeable gate drive device of the present invention, a plurality of parallel-connected electrolytic capacitor modules constituting a gate drive for driving a large-capacity semiconductor of an inverter-driven electric railway vehicle can be detachably manufactured, Since it is possible to replace only the electrolytic capacitor module without replacing the entire gate drive, it is possible to measure and diagnose the lifetime of the electrolytic capacitor at all times and regularly, and precisely maintain the maintenance, There is an effect that can be done.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a capacitor-

The present invention relates to a capacitor-exchangeable gate drive device, and more particularly to a capacitor-exchangeable gate drive device for detachably manufacturing a capacitor module of a gate drive for driving a large-capacity semiconductor of an electric railway vehicle.

In recent years, electric vehicles using electric power have become mainstream in railway vehicles. With the development of advanced semiconductor technology, various types of power conversion devices for supplying power and electric power required for running railway vehicles through electric and electronic control of microprocessor Is used.

The most typical device is a large-capacity propulsion control device, and the control part is a modularized device in the form of a PCB.

However, most of the key devices constituting such a large capacity propulsion control device are foreign products and have high level of stability, but they are difficult to access technically easily by exclusively managing the core technologies therefor.

In addition, an inverter apparatus that converts the electric power required for running an electric railway vehicle to a traction motor is composed of a control computer, a control unit, and a large-capacity power semiconductor for propulsion control.

Such an inverter device is a part corresponding to an engine of an automobile. In order to drive a large-capacity power semiconductor, a gate drive is used which turns on / off the gate for a very short time.

As a core part of the gate drive, a plurality of parallel electrolytic capacitors are used to make a smoothed ON / OFF voltage. The electrolytic capacitors have a service life, and mechanical and electrical characteristics change due to heat generation during switching, There is a problem that affects the performance of an electric railway vehicle.

In addition, electrolytic capacitors are mounted on a PCB, and it is impossible to accurately measure the capacity or life of the capacitors. Therefore, it is difficult to predict the service life due to deterioration. Because it is a PCB type in maintenance, it is difficult to repair quickly because the soldering and waterproofing are peeled off and reworked. .

In addition, since a large number of parallel capacitors are used, replacement work is difficult, and new products need to be replaced after defective identification.

Korean Registered Patent Publication No. 10-0924924

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing an inverter-driven electric railway vehicle in which a plurality of parallel-connected electrolytic capacitor modules constituting a gate drive for driving a large- Since the entire electrolytic capacitor module can be replaced without replacing the entire gate drive in the event of deterioration, it is possible to measure and diagnose the lifetime of the electrolytic capacitor at all times and regularly, and precisely maintain maintenance, so that the failure can be prevented in advance, And a capacitor-exchangeable gate drive device.

According to another aspect of the present invention, there is provided a capacitor-exchangeable gate drive apparatus for driving a power semiconductor through a gate drive in an inverter-driven electric railway vehicle. In the inverter, a square wave The power source of the gate drive is smoothed by using an electrolytic capacitor provided in a separation module unit constituting the gate drive and the smoothed signal is switched through a gate control optical signal by a gate control unit constituting the gate drive The driver module includes a driver PCB having a connection socket at an upper portion thereof and a plurality of fixing portions having screw grooves formed at an inner side thereof in the periphery of the connection socket and detachably coupled to the driver PCB, Of the capacitor And a capacitor PCB having a connection pin electrically connected to the connection socket by connecting a terminal of the capacitor to a lower portion thereof and having a through hole formed at a position corresponding to the fixing portion, The driver PCB and the capacitor PCB are primarily coupled to each other and the fastening means such as a bolt or a screw is inserted into the through hole to be fastened to the fixing portion so that the driver PCB and the capacitor PCB are connected to each other And the capacitor PCB is separated from the capacitor PCB in the separation module unit, and the capacitor PCB is coupled to the remaining remaining time-of-use test device having the connection socket of the same type as the connection socket, and then the capacitance of the plurality of capacitors is measured By knowing in advance the remaining usage time of the capacitor PCB, So that it can be replaced before the failure.

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When the inverter is driven, the input DC power is converted and the linear wave output by 5 pulses for 16.7ms is used as the 3-phase AC power for driving the electric motor, so that the speed control of the electric railway vehicle can be performed.

According to the capacitor-exchangeable gate drive device of the present invention as described above, a plurality of parallel-connected electrolytic capacitor modules constituting a gate drive for driving a large-capacity semiconductor of an inverter-driven electric railway vehicle are removably manufactured, The electrolytic capacitor module can be replaced only without replacing the entire gate drive when the life of the capacitor is deteriorated or deterioration occurs. Therefore, the lifetime of the electrolytic capacitor can be measured and diagnosed at all times and regularly, and accurate maintenance can be performed, The maintenance cost can be reduced.

1 is a block diagram illustrating a power conversion apparatus according to an embodiment of the present invention,
2 is a block diagram illustrating a capacitor-exchangeable gate drive device according to an embodiment of the present invention,
3 is a perspective view illustrating a separation module according to an embodiment of the present invention,
4 is a view illustrating an example of a capacitor PCB constituting a separation module according to an embodiment of the present invention.
5 is an exemplary view illustrating a driver PCB constituting a separation module unit according to an embodiment of the present invention,
6 is a perspective view illustrating a coupling relationship between a capacitor PCB and a driver PCB according to an exemplary embodiment of the present invention.
7 is a graph showing an output waveform through a gate drive according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to facilitate a person skilled in the art to easily carry out the present invention.

1, the gate drive according to an embodiment of the present invention is provided in the converter unit 30 and the inverter unit 50 of the propulsion control device of an electric railway vehicle, The AC power is supplied to the inverter unit 50 through the converter unit 30 through the transformer 10 and the AC power is supplied to the inverter unit 50 through the inverter unit 50 when the AC power is AC, (70).

The converter unit 30 is composed of two in parallel and drives a power semiconductor with a total of eight gate drives 100 called GA85A. The inverter unit 50 is composed of a total of six gate drives 100, .

As shown in FIG. 2, the inverter unit 50 receives DC power of 100 V in the form of a gate drive circuit of a power semiconductor, receives 55.6 V, 50 KHz square waves converted into AC power via the DA converter 200 The power is smoothed by using a plurality of parallel electrolytic capacitors provided in the separation module unit 110 through the gate drive 100 and the smoothed signal is applied to the power semiconductor through the gate control optical signal by the gate controller 150 And is configured to switch for a very short period of time.
The gate drive 100 is installed in the propulsion control device and is modularly mounted on the lower part of the outside of the railway vehicle.

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As shown in FIG. 3, the separation module 110 includes a driver PCB 117 and a capacitor PCB 111 detachably coupled to the driver PCB 117.

4, the capacitor PCB 111 includes a plurality of capacitors 113 connected in parallel at an upper portion thereof, and the terminals of the capacitors 113 are connected to the lower portion of the capacitor PCB 111, A plurality of connection pins 115 to be connected are provided.
Through holes 116 are formed in the capacitor PCB 111 at positions corresponding to the fixing portions 119 to be described later.

5, the driver PCB 117 is provided with a connection socket 118 to which the connection pin 115 is connected at an upper portion thereof and which is connected to the through hole 116 around the connection socket 118 A plurality of fixing portions 119 having screw grooves formed on the inner side thereof are provided.
The driver PCB 117 and the capacitor PCB 111 may be firmly coupled to each other by fastening means such as a bolt or a screw to the through hole 116 to be fastened to the fixing portion 119.

The capacitor PCB 111 may be detachably mounted on the driver PCB 117 through the connection socket 118 and the connection pin 115 as shown in FIG.
The driver PCB 117 and the capacitor PCB 111 are detachably mounted on the driver PCB 117 through the connection socket 118 and the connection pin 115 so that the driver PCB 117 and the capacitor PCB 111 are fixed to each other And the fastening means is pulled by the through hole 116 to be fastened to the fixing portion 119 so that the driver PCB 117 and the capacitor PCB 111 are firmly coupled to each other.

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As shown in FIG. 7, the gate drive 100 according to the present invention outputs 7 pulses of linear wave during 16.7 ms (see the upper graph) during the driving of the converter AC power to DC power. Then, when the inverter is driven, the converted DC power is turned on and off by switching the large capacity power semiconductors to output 5 pulses of linear wave for 16.7ms (refer to the lower graph).
Accordingly, the converted DC main power is used to make the three-phase AC electric power for driving the motor of the electric railway vehicle, so that speed control such as acceleration / deceleration of the electric railway vehicle is performed.
For reference, if 7 pulses of linear wave are not output for 16.7ms and the number of pulses and pulses are different, or if 5 pulses of linear wave are not output for 16.7ms when the inverter is driven, The propulsion control of the power semiconductor may be stopped and the power semiconductor may be damaged.

As described above, in the separation module 110 constituting the gate drive 100 according to the present invention, the capacitor PCB 111 having the electrolytic capacitor 113 is manufactured in a detachable manner, only the capacitor PCB 111 is separated A capacitor PCB 111 is coupled to a remaining remaining time test device (not shown) having a connection socket of the same type as that of the connection socket 118 to measure the electrostatic capacitance of the plurality of electrolytic capacitors 113, It is possible to grasp the remaining use time of the battery 111 in advance.
That is, when the capacitor PCB 111 is coupled to the remaining time-of-use test device in order to measure the capacitance of the electrolytic capacitor 113, the effective capacitance of the electrolytic capacitor 113 provided in the capacitor PCB 111 can be collectively measured And it is possible to calculate the remaining use time of the capacitor PCB 111 through the formula previously set for the calculated capacitance.
Therefore, it is possible to calculate the serviceable time and the travelable distance of the electric railway vehicle by the remaining use time of the capacitor PCB 111, and the capacitor PCB 111 whose service life is short before the remaining use time of the capacitor PCB 111 passes, Can be replaced before the failure to reduce accidental failure of the electric railway vehicle to prevent further loss.
Since the plurality of connection pins 115 provided on the capacitor PCB 111 are connected to the terminals of the electrolytic capacitors 113, the individual capacitances of the electrolytic capacitors 113 are calculated .

The connecting pin 115 of the capacitor PCB 111 can be separated from the connecting socket 118 after the connecting means is separated from the fixing portion 119 even when the gate drive 100 fails, The exchange operation can be carried out.

Therefore, since only the capacitor PCB 111 can be partially exchanged in the gate drive 100, a large failure can be prevented in advance, and the maintenance cost for safe operation of the railway vehicle and operation of the railway vehicle can be reduced accordingly.

In addition, it is expected that the gate drive 100 will be localized, and it will be easy to measure and diagnose from the viewpoint of the railroad operator, and the management improvement effect will be greatly enhanced by the remarkable reduction of the maintenance cost. Is possible.

For reference, five propulsion control devices are installed per each 10-volume subway of the metropolitan subway of the inverter-driven electric railway combined with alternating current and direct current. There are 14 gate drives, total of 70, do.

Since the cost of the foreign product is about 3,000,000 won, the total cost is about 210,000,000 won. However, the gate drive according to the present invention is about 700,000 won per unit, thus a total savings of about 49,000,000 won is obtained, and the cost of replacing the capacitor module is increased It has a saving of about 90%, which is about 97.5% saving compared to the cost of replacing foreign new products.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It will be readily apparent that various substitutions, modifications, and alterations can be made herein.

111: capacitor PCB 113: capacitor
115: connection pin 117: driver PCB
118: connection socket 150: gate control section

Claims

In the inverter driven type electric railway vehicle, a power semiconductor is driven through a gate drive. In the inverter, a square wave power converted into an AC power by receiving a DC power is supplied to an electrolytic capacitor Wherein the smoothed signal is configured to switch the power semiconductor through a gate control optical signal by a gate control unit constituting the gate drive;
Wherein the separation module includes a driver PCB having a connection socket at an upper portion thereof and a plurality of fixing portions having screw grooves formed at an inner side thereof around the connection socket and a plurality of capacitors detachably coupled to the driver PCB, And a capacitor PCB having a connection pin electrically connected to the connection socket by connecting a terminal of the capacitor to a lower portion thereof and having a through hole at a position corresponding to the fixing portion;
A capacitor PCB is detachably mounted on the driver PCB via the connection socket and the connection pin so that the driver PCB and the capacitor PCB are primarily coupled and a fastening means such as a bolt or a screw is inserted into the through- The driver PCB and the capacitor PCB are coupled to each other;
The separating module separates only the capacitor PCB and connects the capacitor PCB to the remaining remaining time test device having the connection socket of the same type as that of the connection socket. Then, the capacitance of the plurality of capacitors is measured, So that the capacitor can be replaced before a failure of the capacitor by grasping the time in advance.

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The method of claim 1, wherein the input DC power is converted and the linear wave output in 5 pulses for 16.7 ms is used as a three-phase AC power for driving the motor to change the speed of the electric railway vehicle Gate drive device.