JP2709204B2 - Voltage type inverter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage voltage type inverter device, and more particularly to a device having a fuse for protecting a power semiconductor element of an inverter.

[0002]

2. Description of the Related Art FIG. 3 is a partially modified version of FIG. 2, for example, regarding the overcurrent / short-circuit protection method of a voltage type GTO inverter on page 419 of the papers of the 1988 Kyushu Branch Federation Meeting. In the figure, 1 is a DC power supply, 10
Numerals 2 and 103 are fuses provided with a fusing indicator. Reference numerals 4 and 5 denote GTOs, and reference numerals 6 and 7 denote diodes connected in antiparallel to the GTOs 4 and 5, which form an arm pair.

Next, the operation will be described. GTO4,5
When an excessive current flows through the fuses, the fuses 102 and 103 are blown to protect the GTO. When the fuses 102 and 103 are blown, the output of the blow indicator provided in the fuses 102 and 103 is input to a control device (not shown) of the inverter to stop the inverter.

[0004]

As described above, the conventional voltage type inverter device uses a fuse with a fusing indicator, and the fuse with a fusing indicator has a poor arc-extinguishing performance of the fusing indicator and is high in performance. It cannot be used for voltage applications, and as a result,
There is a problem that a fuse for protecting the power semiconductor cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and uses a fuse capable of protecting a power semiconductor of a high-voltage voltage type inverter, and has a function of reliably detecting a blown fuse. An object is to obtain a voltage type inverter device.

[0006]

The voltage type inverter device according to the present invention comprises an arm pair formed by connecting in series an arm formed by connecting a diode to a self-extinguishing power semiconductor in an anti-parallel manner. A voltage type inverter device having a fuse provided between an arm pair and a DC voltage source, wherein the fuse is constituted by a fuse having no fusing indicator, and a resistor and a current flowing through the resistor are directly or indirectly transmitted. And a fuse detector configured to detect a blow of the fuse by comparing the fuse with a threshold. The fuse blow detector includes a positive terminal and a negative terminal of the arm pair. It is provided between them.

[0007]

According to the present invention, a fuse suitable for a high-voltage circuit is used, and a resistor provided between the positive and negative electrodes of the arm pair and a current detector which detects the fusing of the fuse based on the magnitude of the current flowing therethrough are used. Thus, a voltage type inverter device having a highly reliable fusing detection device can be obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numerals 2 and 3 denote high-voltage fuses without a fusing indicator, and 10 denotes a fuse fusing detection device including a resistor 8 and a current detector 9.

FIG. 2 shows the fuse blowout detecting device 1 described above.
FIG. 9 is a block diagram showing an embodiment of a current detector 9 of 0, 9 and 9;
5, 97, 98 are resistors, 92 is a Zener diode, 93
Is a MOSFET, 94 is an optical driver such as a photocoupler or an optical fiber, 96 is a voltage source, and 99 is a capacitor.

Next, the operation will be described. Fuse 2,
If 3 is sound, the voltage of the DC voltage source 1 is applied to the fuse blowing detector 10. Here, assuming that the resistance value of the resistor 8 is R and the voltage of the DC voltage source 1 is E, a current of I = E / R flows. When the fuses 2 and 3 are blown, the current flowing through the fuse blown detection device 10 is reduced to a value equal to or less than the leakage current value of the power semiconductor (not shown) of the other arm pair. If the current is detected and the current is equal to or greater than the threshold value, the fuses 2 and 3 are determined to be sound.

At this time, the current detector 9 operates as follows. The resistor 91 is provided in series with the resistor 8,
Assuming that the resistance value of the resistor 91 is r and the current flowing through the resistor 91 is i, the voltage v across the resistor 91 is v = r × i.
Assuming that the Zener voltage of the Zener diode 92 is v _Z , i
> V _Z / r, the MOSFET 93 turns on and i>
v If _Z / r, MOSFET 93 is turned off, it can be determined sound or blown fuses 2.

When the MOSFET 93 is turned on, the voltage source 9
The current in which the resistor 95 is limited from 6 flows to the optical driver 94 to transmit the soundness or the blow of the fuses 2 and 3 to the control device (not shown) of the inverter.

The resistor 98 and the capacitor 99 constitute a filter for removing noise. Reference numeral 97 denotes a bias resistor.

[0014]

As described above, according to the present invention, a fuse having no blowout indicator is used, and a fuse blowout detecting device including a resistor and a current detector is provided. There is an effect that a voltage type inverter device provided with a highly reliable protection device can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a voltage type inverter device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an embodiment of a current detector 9 included in the fuse blowing detection device 10 of FIG.

FIG. 3 is a configuration diagram of a conventional voltage type inverter device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 DC voltage source 2, 3 High voltage fuse without blow indicator 4, 5 GTO 6, 7 Freewheeling diode 8 Resistance 9 Current detector 10 Fuse blow detector 91, 95, 97, 98 Resistance 92 Zener diode 94 MOSFFET 96 Voltage source 99 Capacitor

Claims (1)

(57) [Claims] An arm pair formed by connecting a diode to a self-extinguishing power semiconductor in anti-parallel is connected in series to form an arm pair, and a fuse is provided between the arm pair and a DC voltage source. In the voltage-type inverter device provided, the fuse is constituted by a fuse having no fusing indicator, and a resistor and a current flowing through the resistor are detected directly or indirectly, and this is compared with a threshold to compare the fuse with the fuse. A voltage-type inverter device, comprising: a fuse blowing detection device configured by a current detector for detecting blowing; and the fuse blowing detection device provided between a positive terminal and a negative terminal of the arm pair.