JP3372208B2 - Evaluation method of self-extinguishing element - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for evaluating a self-arc-extinguishing element.

[0002]

2. Description of the Related Art FIG. 6 shows a turn-on evaluation test circuit for a conventional self-turn-off device. A series circuit including a snubber diode 2 and a snubber capacitor 3 is connected in parallel to the self-extinguishing element 1, and a resistor 4 is connected in parallel to the snubber diode 2. A snubber circuit is configured by the snubber diode 2, the snubber capacitor 3, and the resistor 4. The constant voltage source 20 is connected in a direction in which the anode side of the self-extinguishing element 1 is positive. The reactor 21 is a voltage source 2
It is connected between the positive electrode of 0 and the anode of the self-arc-extinguishing element 1 and determines the rate of increase of the current when the self-extinguishing element 1 is turned on.

In the conventional turn-on evaluation of the self-arc-extinguishing element 1, the self-arc-extinguishing element 1 is turned on in the state where a constant voltage is applied between the anode and the cathode of the self-arc-extinguishing element 1 by the voltage source 20. As a result, current flows from the voltage source 20 at a rate of increase of the current determined by the voltage of the voltage source 20 and the inductance of the reactor 21.

Since the snubber capacitor 3 is charged to the voltage of the voltage source 20 before it is turned on, a discharge current flows from the snubber capacitor 3 through the resistor 4 to the self-extinguishing element 1.

At this time, the turn-on test of the self-arc-extinguishing element 1 is performed by adjusting the voltage of the voltage source 20 and the inductance of the reactor 21 to match the maximum rating of the self-extinguishing element 1. Further, a method of evaluating how much the self-arc-extinguishing element 1 can withstand at turn-on by increasing the voltage of the voltage source 20 or further reducing the inductance of the reactor 21 has been used.

[0006]

In a self-excited converter using a self-arc-extinguishing element, a large capacity capacitor is used as a DC voltage source. This capacitor is selected so that the voltage does not fluctuate as much as possible, but the voltage fluctuates depending on the circuit conditions. When the voltage applied to the self-arc-extinguishing element 1 rises due to the fluctuation of the DC voltage, a current flows through the snubber diode 2 to the snubber capacitor 3 to charge the snubber capacitor 3.

When the self-arc-extinguishing element 1 is turned on while the snubber diode 2 is energized, the current flowing in the snubber diode 2 suddenly moves to the self-arc-extinguishing element 1.
Even after the current of the snubber diode 2 becomes zero, the reverse recovery charge of the snubber diode 2 flows into the self-extinguishing element 1.

Self-extinguishing element 1 from snubber diode 2
Since the rise of the current flowing into the device is determined only by the turn-on time of the self-extinguishing element 1, it is very fast at 1000 A / μ.
It becomes S or more. Further, while the current is flowing through the snubber diode 2, the voltage of the diode is a low voltage corresponding to the forward voltage drop, and the voltage of the snubber capacitor 3 is applied to the self-extinguishing element 1.

The instantaneous loss of the self-extinguishing element 1 at turn-on is given as the product of voltage and current during the turn-on process. Therefore, when the above phenomenon occurs, the voltage applied to the self-arc-extinguishing element 1 remains high, and the current rapidly rises, so that the loss generated when the self-arc-extinguishing element 1 is turned on becomes very large. . The larger the rate of rise of the voltage applied to the self-extinguishing element 1, the larger the current flowing through the snubber diode 2, and the loss when the device is turned on becomes very large.

This loss is several times or more in both peak value and total energy amount as compared with the loss that occurs at turn-on from a constant voltage. Even if the inductance of the reactor 21 is reduced and the current rises faster in the conventional evaluation circuit, the loss at turn-on of the self-arc-extinguishing element 1 increases, but the voltage between the anode and cathode of the self-arc-extinguishing element 1 increases. Since the current rises after it starts to fall, the loss is smaller than that in the state where the current flows while the voltage remains high, and the conventional evaluation circuit cannot evaluate the above loss.

As described above, the evaluation circuit for the conventional self-arc-extinguishing element is not sufficiently evaluated at the time of turn-on, and the reliability of the self-arc-extinguishing element and the reliability of the device using the same are impaired.

Therefore, the present invention provides a method for evaluating a self-arc-extinguishing element that simulates a state in which a very large loss as described above is generated, and provides a highly reliable self-arc-extinguishing element. To aim.

[0013]

In order to achieve the above object, in the method for evaluating a self-extinguishing element according to claim 1 of the present invention, the capacitor of the snubber circuit is charged by the first voltage source. , Then turn on the switch connected to the second voltage source. This causes a current to charge the snubber circuit capacitor from the second voltage source to flow through the first diode of the snubber circuit. When the self-extinguishing element is ignited while current is flowing through the first diode, the current of the first diode rapidly shifts to the self-extinguishing element and the current flows through the first diode. During this period, the voltage of the capacitor of the snubber circuit is applied to the self-arc-extinguishing element, so that excessive loss occurs in the self-arc-extinguishing element.

In the method for evaluating a self-extinguishing element according to a second aspect of the present invention, the capacitor of the snubber circuit is charged by the first voltage source, and then the switch connected to the second voltage source is turned on. Turn on. This causes a current to charge the snubber circuit capacitor from the second voltage source to flow through the first diode of the snubber circuit. When the self-extinguishing element is ignited while current is flowing through the first diode, the current of the first diode rapidly shifts to the self-extinguishing element and the current flows through the first diode. During this period, the voltage of the capacitor of the snubber circuit is applied to the self-arc-extinguishing element, so that excessive loss occurs in the self-arc-extinguishing element.

In the method for evaluating a self-extinguishing element according to the third aspect of the present invention, by turning on the switch, the current for charging the capacitor of the snubber circuit flows from the voltage source through the diode of the snubber circuit. When the self-extinguishing element is ignited in the state where the current is flowing in the diode, the current of the diode suddenly shifts to the self-extinguishing element,
Since the voltage of the capacitor of the snubber circuit is applied to the self-arc-extinguishing element while current is flowing through the diode, excessive loss occurs in the self-arc-extinguishing element.

In the method for evaluating a self-arc-extinguishing element according to a fourth aspect of the present invention, by turning on the switch, a current for charging the capacitor of the snubber circuit from the AC voltage source flows through the diode of the snubber circuit. When the self-arc-extinguishing element is ignited while current is flowing in the diode, the current of the diode rapidly shifts to the self-arc-extinguishing element and the capacitor of the snubber circuit is supplied while the current is flowing in the diode. Is applied to the self-arc-extinguishing element, an excessive loss occurs in the self-arc-extinguishing element. In the method for evaluating a self-arc-extinguishing element according to the fifth aspect of the present invention, by turning on the self-arc-extinguishing element, a current flows from the voltage source to the self-arc-extinguishing element through the reactor. Further, when the self-arc-extinguishing element is turned off, the capacitor of the snubber circuit of the self-arc-extinguishing element is charged, and the current flowing in the reactor is circulated to the second diode connected in parallel with the reactor. When the self-arc-extinguishing element is again ignited while the current is flowing in the second diode, the current of the second diode rapidly shifts to the self-arc-extinguishing element, and at the same time, the current is supplied to the second diode. Since the voltage of the capacitor of the snubber circuit is applied to the self-arc-extinguishing element while flowing, an excessive loss occurs in the self-arc-extinguishing element.

In the method for evaluating a self-extinguishing element according to the sixth aspect of the present invention, when the self-extinguishing element is ignited in a state where a current is flowing through the diode of the snubber circuit, the current of the diode is suddenly self-excited. While moving to the arc extinguishing element, the voltage of the capacitor of the snubber circuit is applied to the self arc extinguishing element while the current is flowing in the diode, so that excessive loss occurs in the self arc extinguishing element.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. (First Embodiment) FIG. 1 shows a method for evaluating a self-arc-extinguishing element according to the first embodiment of the present invention. The same elements as those in FIG. 6 are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1, a first voltage source 6 is connected to a self-extinguishing element 1 via a series circuit of a diode 6 and a reactor 7, and a second voltage source 9 is a series circuit of a switch 10 and a reactor 11. It is connected to the self-extinguishing element 1 via. The second voltage source 9 outputs a voltage higher than that of the first voltage source 5, and the reactor 11 determines the rate of increase of the current from the second voltage source 9 and the current value.

In the present embodiment, first, the snubber capacitor 3 of the self-extinguishing element 1 is charged to a predetermined voltage by the first voltage source 5. In this state, the snubber capacitor 3 has the same voltage as the first voltage source 5, and the current of the snubber diode 2 is zero.

Next, the thyristor 10 is ignited. When the thyristor 10 is ignited, the voltage of the second voltage source 9 is higher than the voltage of the first voltage source 5, so that the current determined by the inductance of the reactor 11 from the second voltage source 9 passes through the snubber diode 2 to the snubber capacitor 3. The flow snubber capacitor 3 is charged.

Then, the voltage of the snubber capacitor 3 becomes the second
The self-extinguishing element 1 is ignited before the voltage of the voltage source 9 is reached. When the self-extinguishing element 1 is ignited, the snubber capacitor 3 is being charged and a current is flowing through the snubber diode 2, so that the self-extinguishing element 1 suddenly shifts the current from the snubber diode 2 and , The voltage of the snubber capacitor 3 is applied to the self-arc-extinguishing element 1, causing a large loss.

At this time, the generated loss can be adjusted by adjusting the current flowing through the snubber diode 2, that is, the timing of igniting the thyristor 10 and then igniting the self-extinguishing element 1. By adjusting the voltages of the first voltage source 5 and the second voltage source 9 to the actual usage state, it is possible to confirm the withstand amount in the usage state.

As described above, according to the first embodiment of the present invention, it is possible to evaluate a large loss that occurs when the self-arc-extinguishing element 1 is turned on while the DC voltage is rising, and it is highly reliable. A self-extinguishing element can be provided.

(Second Embodiment) FIG. 2 shows a second embodiment of the present invention.
6 is a method of evaluating the self-extinguishing element according to the embodiment of FIG.
The same elements as those of 1 are denoted by the same reference numerals and description thereof will be omitted.

In FIG. 2, the first voltage source 5 is connected to the self-extinguishing element 1 via a series circuit of a diode 6 and a reactor 7, and the negative terminal of the second voltage source 13 is the first voltage source. 5, the positive terminal of the second voltage source 13 is connected to the anode of the self-extinguishing element 1 via the series circuit of the thyristor 14 and the reactor 15.

In the present embodiment, first, the first voltage source 5 charges the snubber capacitor 3 of the self-arc-extinguishing element 1 to a predetermined voltage. In this state, the snubber capacitor 3 has the same voltage as the first voltage source 5, and the current of the snubber diode 2 is zero.

Next, the thyristor 14 is ignited. When the thyristor 14 is ignited, the voltage of the second voltage source 13 is added to the voltage of the first voltage source 5, so that the current determined by the inductance of the reactor 15 from the second voltage source 13 passes through the snubber diode 2 and the snubber capacitor 2. 3 and the snubber capacitor 3 is charged.

The voltage of the snubber capacitor 3 is the first
The self-extinguishing element 1 is ignited before the voltage of the total value of the voltage source 5 and the second voltage source 13 is reached. Self-extinguishing element 1
When the snubber capacitor 3 is being charged, the snubber capacitor 3 is being charged and a current is flowing through the snubber diode 2. Therefore, the current from the snubber diode 2 is rapidly transferred to the self-extinguishing element 1 and the voltage of the snubber capacitor 3 is increased. Is applied to the self-extinguishing element 1 and a large loss occurs.

At this time, the generated loss can be adjusted by adjusting the current flowing through the snubber diode 2, that is, the timing of firing the self-extinguishing element 1 after firing the thyristor 14. By adjusting the voltages of the first voltage source 5 and the second voltage source 13 to the actual usage state, it is possible to confirm the withstand capacity in the usage state.

As described above, according to the second embodiment of the present invention, it is possible to evaluate a large loss that occurs when the self-arc-extinguishing element 1 is turned on while the DC voltage is rising, and it is highly reliable. A self-extinguishing element can be provided. In the second embodiment, the voltage of the second voltage source 13 is
Since the voltage may be smaller than the voltage of the second voltage source 9 of the first embodiment, the evaluation circuit can be downsized.

(Third Embodiment) FIG. 3 shows a third embodiment of the present invention.
6 is an evaluation method of the self-extinguishing element 1, and the same elements as those in FIG.

In FIG. 3, the voltage source 9 is connected to the self-extinguishing element 1 via a series circuit of a switch 10 and a reactor 11. In the present embodiment, first, the thyristor 10 is ignited. When the thyristor 10 is ignited, a current determined by the inductance of the reactor 11 from the voltage source 9 flows into the snubber capacitor 3 through the snubber diode 2 and charges the snubber capacitor 3.

The self-extinguishing element 1 is ignited before the voltage of the snubber capacitor 3 reaches the voltage of the voltage source 9. Since the snubber capacitor 3 is being charged and a current is flowing in the snubber diode 2, the current suddenly shifts from the snubber diode 2 to the self-extinguishing element 1 and the voltage of the snubber capacitor 3 changes. Is applied to the switch and a large loss occurs.

At this time, the generated loss can be adjusted by adjusting the current flowing through the snubber diode 2, that is, the timing of firing the thyristor 10 and then firing the self-extinguishing element 1. By adjusting the voltage of the voltage source 9 to the actual use condition, it is possible to confirm the withstand capacity in the use condition.

As described above, according to the third embodiment of the present invention, it is possible to evaluate a large loss that occurs when the self-arc-extinguishing element 1 is turned on while the DC voltage is rising, and it is highly reliable. A self-extinguishing element can be provided.

(Fourth Embodiment) FIG. 4 shows a fourth embodiment of the present invention.
6 is an evaluation method of the self-extinguishing element 1, and the same elements as those in FIG.

In FIG. 4, the AC voltage source 14 is connected to the self-extinguishing element 1 via a series circuit of a switch 10 and a reactor 11. In the present embodiment, first, the thyristor 10 is ignited when the AC voltage is positive. When the thyristor 10 is ignited, the AC voltage source 14 causes the reactor 1
A current determined by the inductance of 1 flows into the snubber capacitor 3 through the snubber diode 2 and charges the snubber capacitor 3.

Then, the self-extinguishing element 1 is ignited in the state where the current flows through the snubber diode 2. Since the snubber capacitor 3 is being charged and a current is flowing in the snubber diode 2, the current suddenly shifts from the snubber diode 2 to the self-extinguishing element 1 and the voltage of the snubber capacitor 3 changes. Is applied to the switch and a large loss occurs.

At this time, the generated loss can be adjusted by adjusting the current flowing through the snubber diode 2, that is, the timing of firing the self-extinguishing element 1 after firing the thyristor 10. By adjusting the voltage of the AC voltage source 14 to the actual use condition, it is possible to confirm the withstand capacity in the use condition.

As described above, according to the fourth embodiment of the present invention, it is possible to evaluate a large loss that occurs when the self-arc-extinguishing element 1 is turned on while the DC voltage is rising, and it is possible to obtain high reliability. A self-extinguishing element can be provided.

(Fifth Embodiment) FIG. 5 shows the fifth embodiment of the present invention.
6 is an evaluation method of the self-extinguishing element 1, and the same elements as those in FIG.

In FIG. 5, the voltage source 5 is a reactor 15
Is connected to the self-extinguishing element 1 via a diode 16
Is connected to the terminal of the reactor 15 on the side of the voltage source 5, and the cathode of the diode 16 is connected to the terminal of the reactor 15 on the side of the self-extinguishing element 1.

In the present embodiment, first, the self-extinguishing element 1
Fire. As a result, a current determined by the inductance of the reactor 15 flows from the voltage source 5 to the self-extinguishing element 1.

Next, the self-extinguishing element 1 is once turned off with the current reaching a predetermined value. The current flowing in the self-extinguishing element 1 charges the snubber capacitor 3, and the current in the reactor 15 circulates through the diode 16.

When the self-arc-extinguishing element 1 is ignited again while the current of the diode 16 is flowing, the current flowing in the diode 16 sharply decreases, and the self-arc-extinguishing element 1 is changed by that amount. The current suddenly flows. Diode 16
Since the voltage of the diode 16 is very small in the state where a current is flowing in, the voltage of the voltage source 5 is applied to the self-turn-off element 1. The current suddenly rises while the voltage of the voltage source 5 is being applied, which again causes a large loss.

At this time, the current flowing through the diode 16
That is, the loss generated can be adjusted by adjusting the timing of re-ignition after turning off the self-extinguishing element 1. By adjusting the voltage of the voltage source 5 to the actual use condition, it is possible to confirm the withstand capacity in the use condition.

As described above, according to the fifth embodiment of the present invention, it is possible to evaluate the large loss that occurs when the self-arc-extinguishing element 1 is turned on while the DC voltage is rising, and it is highly reliable. A self-extinguishing element can be provided.

The circuit in which the reactor is connected between the voltage source and the self-extinguishing type element has been described with reference to FIGS. 1 to 4, but the reactor may be a resistor or an impedance as long as it limits the current. I wish I had it. Also,
The voltage source may be a capacitor and a charger instead of the power source.

[0050]

As described in detail above, according to the present invention,
The self-extinguishing element can be evaluated against an excessive loss at turn-on while the snubber diode is energized while the voltage is rising, and a highly reliable self-extinguishing element can be provided. Furthermore, the reliability of the device using this self-arc-extinguishing type element can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an evaluation circuit for a self-arc-extinguishing element according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a self-extinguishing element evaluation circuit according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of an evaluation circuit for a self-extinguishing element according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of an evaluation circuit for a self-extinguishing element according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram of an evaluation circuit for a self-extinguishing element according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram of a conventional evaluation circuit for a self-extinguishing element.

[Explanation of symbols]

1. Self-extinguishing element 2 ... Snubber diode 3 ... snubber capacitor 4 ... resistance 5: first voltage source 6 ... Diode 7 ... Reactor 9 ... Second voltage source 10 ... Thyristor 11 ... Reactor 13 ... Voltage source 14 ... AC voltage source 15 ... Reactor 16 ... Diode 20 ... Voltage source 21 ... Diode

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01R 31/26 H01L 21/66

Claims (6)

(57) [Claims] 1. A snubber circuit comprising a self-arc-extinguishing element, a first diode and a capacitor connected in parallel with the self-arc-extinguishing element, and a second diode and an impedance in the self-arc-extinguishing element. And a second voltage source having a higher voltage than the first voltage source connected to the self-extinguishing element via a series circuit of a switch and an impedance. A method for evaluating a self-arc-extinguishing element, comprising: turning on the switch and turning on the self-arc-extinguishing element during a period in which a current is flowing through the first diode. 2. A snubber circuit comprising a self-arc-extinguishing element, a first diode and a capacitor connected in parallel to the self-arc-extinguishing element, and a second diode and a second diode in the self-arc-extinguishing element. A first voltage source connected through a series circuit of impedance 1, a positive electrode connected to the self-extinguishing element through a series circuit of a switch and a second impedance, and a negative voltage of the first voltage source. Second connected to the positive electrode of the source
And a voltage source for the self-extinguishing element, wherein the self-extinguishing element is turned on while a current is flowing through the first diode after the switch is turned on. 3. A self-arc-extinguishing element, a snubber circuit comprising a diode and a capacitor connected in parallel to the self-extinguishing element, and a series circuit of a switch and an impedance connected to the self-extinguishing element. A method of evaluating a self-arc-extinguishing element, comprising: connecting a voltage source; and turning on the self-arc-extinguishing element during a period when a current is flowing through the diode after turning on the switch. 4. A snubber circuit comprising a self-arc-extinguishing element, a diode and a capacitor connected in parallel to the self-arc-extinguishing element, and a series circuit of a switch and an impedance connected to the self-arc-extinguishing element. An AC voltage source connected to the self-extinguishing element for turning on the switch when the AC voltage source outputs a positive voltage, and for turning on the self-extinguishing element during a period when current is flowing through the diode. A method for evaluating a self-arc-extinguishing element characterized by the above. 5. A self-extinguishing element, a snubber circuit comprising a first diode and a capacitor connected in parallel to the self-extinguishing element, and a self-extinguishing element connected via a reactor. A voltage source and a second diode connected in parallel to the reactor in a direction in which the terminal on the voltage source side serves as a cathode are provided, and after turning on the self-extinguishing element once and flowing a current, A method for evaluating a self-arc-extinguishing element, characterized in that the self-arc-extinguishing element is turned off, and the self-arc-extinguishing element is turned on while a current is flowing through the second diode. 6. A method for evaluating a self-arc-extinguishing element to which a snubber circuit including a diode and a capacitor is connected,
A method for evaluating a self-arc-extinguishing element, characterized in that the self-arc-extinguishing element is turned on while a current is flowing through the diode.