JP2003052179A - Power converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop operation of an apparatus by opening a cover and quickly discharge a filter capacitor without a discharge contactor. SOLUTION: One end part of an insulation plate 9 is attached to the rear surface of a cover of the power converter body which rotates about a hinge, a conductor 10 is attached to both surfaces of the other end part of the insulation plate 9, the insulation plate 9 is held between the first contacts 11 located between the cover 8 and a conductor 10, the conductor 10 attached to the other end part of the insulation plate 9 is held between the second contacts 12, a discharge resistor 13 of the filter capacitor 4 is connected to one contact of the first contacts 11, the other contact of the first contacts 11 is connect to the side of filter capacitor 4, where the discharge resistor 13 is not connected, and the second contacts 13 are inserted to the input part of a control power supply circuit 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power conversion device that includes a filter capacitor and performs power conversion, and more particularly to a power conversion device that can quickly discharge the electric charge of the filter capacitor when the device is stopped.

[0002]

2. Description of the Related Art Conventionally, for example, a power converter for converting DC power into AC power has a filter capacitor.

FIG. 11 is a circuit diagram showing a structural example of a conventional power conversion device of this type.

In FIG. 11, the switch 1 indicates that the cover of the main body of the power converter which rotates about the hinge is opened.
After the detection, the main contact 3 of the discharge contactor is turned on after the input contactor 2 is opened, and the electric charge of the filter capacitor 4 is discharged through the discharge resistor 13.

The coil 5 of the input contactor 2 and the coil 6 of the discharge contactor are controlled by an excitation sequence circuit and an excitation circuit included in the control circuit 7, respectively.

Reference numeral 18 denotes a high resistance discharge circuit provided in parallel with the filter capacitor 4.

[0007]

However, in the above conventional power converter, the coil 6 of the discharge contactor is excited in order to keep the main contact 3 of the discharge contactor open during the operation of the device. Control power is consumed.

Further, it is necessary to provide a discharge contactor, and its excitation sequence circuit and excitation circuit.

An object of the present invention is to provide a power conversion device capable of stopping the device by opening the cover and rapidly discharging the electric charge of the filter capacitor without a discharge contactor.

[0010]

In order to achieve the above object, the power converter of the invention according to claim 1 has an insulating plate on the back surface of the cover of the power converter main body which rotates around the hinge. Attach one end, attach conductors on both sides of the other end of the insulating plate, sandwich the insulating plate between the first contact located between the cover and the conductor, and insulate between the second contacts. Insert the conductor attached to the other end of the plate,
One of the first contacts is connected to the discharge resistance of the filter capacitor, the other of the first contacts is connected to the side of the filter capacitor where the discharge resistance is not connected, and the second contact is
It is formed by inserting it into the input part of the control power supply circuit.

Therefore, in the power converter of the invention according to claim 1, when the cover is rotated around the hinge and opened, the connection between the second contacts by the conductor is lost and the input of the control power supply is turned off. , The switching of the semiconductor elements of the device is stopped and the input contactor is turned off. further,
The insulating plate between the first contacts disappears, the first contacts come into contact with each other by the restoring force of the leaf spring, and the charge of the filter capacitor is discharged through the discharge resistor. Thus, even without the discharge contactor, the excitation of the coil of the input contactor can be turned off by opening the cover, and the electric charge of the filter capacitor can be quickly discharged.

In the power converter of the invention according to claim 2, one end of the insulating plate is attached to the back surface of the cover of the main body of the power converter that rotates about the hinge, and one surface of the other end of the insulating plate is attached. , A conductor is attached, an insulating plate is sandwiched between the first contact located between the cover and the conductor, and the second contact is brought into contact with the conductor attached to the other end of the insulating plate. Connect the discharge resistance of the filter capacitor to one of the contacts, connect the other of the first contacts to the side of the filter capacitor where the discharge resistance is not connected, and connect the second contact to the input of the control power circuit. It is made by inserting into the section.

Therefore, in the power converter of the invention according to claim 2, when the cover is rotated around the hinge and opened, the connection between the second contacts by the conductor is lost and the input of the control power supply is turned off. , The switching of the semiconductor elements of the device is stopped and the input contactor is turned off. further,
The insulating plate between the first contacts disappears, the first contacts come into contact with each other by the restoring force of the leaf spring, and the charge of the filter capacitor is discharged through the discharge resistor. Thus, even without the discharge contactor, the excitation of the coil of the input contactor can be turned off by opening the cover, and the electric charge of the filter capacitor can be quickly discharged.

Further, according to a third aspect of the power converter of the present invention, one end of an insulating plate is formed on the back surface of the cover of the main body of the power converter which rotates about the hinge, and which is concentric with the opening / closing part of the cover. Attach the conductor to both surfaces of the other end of the insulating plate, sandwich the insulating plate between the first contact located between the cover and the conductor, and insert the insulating plate between the second contacts. Insert the conductor attached to the other end,
One of the first contacts is connected to the discharge resistance of the filter capacitor, the other of the first contacts is connected to the side of the filter capacitor where the discharge resistance is not connected, and the second contact is
It is formed by inserting it into the input part of the control power supply circuit.

Therefore, in the power converter of the invention according to claim 3, when the cover is rotated around the hinge and opened, the connection between the second contacts by the conductor is lost and the input of the control power supply is turned off. , The switching of the semiconductor elements of the device is stopped and the input contactor is turned off. further,
The insulating plate between the first contacts disappears, the first contacts come into contact with each other by the restoring force of the leaf spring, and the charge of the filter capacitor is discharged through the discharge resistor. Thus, even without the discharge contactor, the excitation of the coil of the input contactor can be turned off by opening the cover, and the electric charge of the filter capacitor can be quickly discharged.

Further, according to a fourth aspect of the power converter of the present invention, one end of an insulating plate that is concentric with the opening / closing part of the cover is formed on the back surface of the cover of the main body of the power converter that rotates around the hinge. Part, attach a conductor to one surface of the other end of the insulating plate, sandwich the insulating plate between the first contact located between the cover and the conductor, and connect the second contact to the other of the insulating plate. Contact the conductor attached to the end,
One of the first contacts is connected to the discharge resistance of the filter capacitor, the other of the first contacts is connected to the side of the filter capacitor where the discharge resistance is not connected, and the second contact is
It is formed by inserting it into the input part of the control power supply circuit.

Therefore, in the power converter of the invention according to claim 4, when the cover is rotated around the hinge and opened, the connection between the second contacts by the conductor is lost and the input of the control power supply is turned off. , The switching of the semiconductor elements of the device is stopped and the input contactor is turned off. further,
The insulating plate between the first contacts disappears, the first contacts come into contact with each other by the restoring force of the leaf spring, and the charge of the filter capacitor is discharged through the discharge resistor. Thus, even without the discharge contactor, the excitation of the coil of the input contactor can be turned off by opening the cover, and the electric charge of the filter capacitor can be quickly discharged.

On the other hand, the power converter of the invention according to claim 5 is the power converter of the invention according to any one of claims 1 to 4, wherein an insulating plate attached to the back surface of the cover. A protrusion made of an insulating material is provided between the conductor and the first contact.

Therefore, in the power converter of the invention according to claim 5, the creeping surface is formed by providing the protrusion made of an insulator between the conductor of the insulating plate attached to the back surface of the cover and the first contact. The distance can be increased.

A power converter according to a sixth aspect of the present invention is the power converter according to any one of the first to fifth aspects, wherein the second contact is connected to a start command circuit. Have been inserted into.

Therefore, in the power converter of the invention according to claim 6, by inserting the second contact in the start command circuit, the energizing current of the second contact can be reduced.

[0022]

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 is a main part diagram and a cross-sectional view showing a configuration example of a power conversion device according to this embodiment, and FIG. 2 shows a configuration example of a power conversion device according to this embodiment. 11 is a circuit diagram, the same elements as those in FIG. 11 are denoted by the same reference numerals, and the description thereof will be omitted.

In FIGS. 1 and 2, one end of an insulating plate 9 is attached to the back surface of the cover 8 of the main body of the power converter that rotates about the hinge, and the conductor 10 is attached to both surfaces of the other end of the insulating plate 9. Is attached.

Further, the insulating plate 9 is sandwiched between the first contacts 11 located between the cover 8 and the conductor 10, and the other end of the insulating plate 9 is sandwiched between the second contacts 12. The attached conductor 10 is sandwiched.

Further, the discharge resistor 13 of the filter capacitor 4 shown in FIG. 2 is connected to one of the first contacts 11, and the other of the first contacts 11 is connected to the discharge resistor 13 of the filter capacitor 4. Connected to the other side.

Furthermore, the second contact 12 is inserted in the input section of the control power supply circuit 14.

Next, the operation of the power conversion device according to the present embodiment configured as described above will be described.

In FIGS. 1 and 2, when the cover 8 is rotated about the hinge and opened, the second contact 12 is disconnected from the conductor 10 of FIG. 1 and the control power supply circuit 14 is turned off. The connection between the second contacts 12 by the conductor 10 is lost, the input of the control power supply is turned off, the switching of the semiconductor element of the power conversion device is stopped, and the excitation of the coil 5 of the input contactor is turned off and stopped.

Furthermore, the insulating plate 9 between the first contact points 11 is eliminated, the first contact points 11 come into contact with each other by the restoring force of the leaf spring, and a discharge circuit is formed. It is short-circuited by 13 and discharged.

As a result, even without the discharge contactor, by opening the cover 8, the excitation of the coil 5 of the input contactor is turned off, and the charge of the filter capacitor 4 is quickly discharged.

As described above, in the power converter according to the present embodiment, it is possible to stop the device by opening the cover 8 and quickly discharge the electric charge of the filter capacitor 4 without a discharge contactor. Become.

As a result, it is not necessary to continue to excite the coil 6 of the discharge contactor during the operation of the apparatus as in the conventional case described above, and it is possible to save unnecessary control power and save energy.

Further, it is not necessary to provide the discharge contactor and its exciting sequence circuit and exciting circuit.

(Second Embodiment) FIG. 3 is a main part view and a cross-sectional view showing a structural example of a power converter according to the present embodiment. The same elements as those in FIG. 11 are designated by the same reference numerals. The description is omitted, and only different parts will be described here.

In FIG. 3, one end of an insulating plate 9a is attached to the back surface of the cover 8 of the main body of the electric power converter which rotates about the hinge, and the conductor 10a is attached to one surface of the other end of the insulating plate 9a. There is.

The insulating plate 9a is sandwiched between the first contacts 11 located between the cover 8 and the conductor 10a, and the second contact 12a is attached to the other end of the insulating plate 9a. The conductor 10a.

Further, the discharge resistor 13 of the filter capacitor 4 shown in FIG. 2 is connected to one of the first contact points 11, and the discharge resistor 13 of the filter capacitor 4 is connected to the other of the first contact points 11. Connected to the other side.

Furthermore, the second contact 12a is inserted in the input section of the control power supply circuit 14.

Next, the operation of the power converter according to the present embodiment configured as described above will be described.

In FIG. 3, when the cover 8 is rotated about the hinge and opened, the second contact 12 is brought into contact with the conductor 10a shown in FIG.
The control power supply circuit 14 is turned off and the control power supply circuit 14 is turned off. That is, the connection of the conductors between the second contacts 12a is lost and the input of the control power supply is turned off. The excitation of the coil 5 of the contactor is turned off and stopped.

Further, the insulating plate 9a between the first contact points 11 is eliminated, the first contact points 11 come into contact with each other due to the restoring force of the leaf spring, and a discharge circuit is formed, so that the filter capacitor 4
The electric charges are discharged by being short-circuited by the discharge resistor 13.

As a result, even without the discharge contactor, by opening the cover 8, the excitation of the coil 5 of the input contactor is turned off, and the charge of the filter capacitor 4 is quickly discharged.

As described above, also in the power conversion device according to this embodiment, it is possible to stop the device by opening the cover 8 and quickly discharge the electric charge of the filter capacitor 4 without a discharge contactor. Become.

As a result, it is not necessary to continue to excite the coil 6 of the discharge contactor during the operation of the apparatus as in the conventional case described above, so that it is possible to save unnecessary control power and save energy.

Further, it is not necessary to provide the discharge contactor and its exciting sequence circuit and exciting circuit.

(Third Embodiment) FIG. 4 is a principal part view and a sectional view showing a structural example of a power converter according to the present embodiment. The same elements as those in FIG. 11 are designated by the same reference numerals. The description is omitted, and only different parts will be described here.

In FIG. 4, one end of an insulating plate 9b which is concentric with the opening / closing part of the cover 8 is attached to the back surface of the cover 8 of the main body of the electric power converter which rotates about the hinge. Conductors 10b are attached to both surfaces of the other end.

The insulating plate 9b is sandwiched between the first contacts 11a located between the cover 8 and the conductor 10b, and the other end of the insulating plate 9b is inserted between the second contacts 12b. The attached conductor 10b is sandwiched.

Further, one of the first contacts 11a is provided with
Connect the discharge resistor 13 of the filter capacitor 4 shown in
The other of the first contacts 11a is connected to the filter capacitor 4
Is connected to the side to which the discharge resistor 13 is not connected.

Further, the second contact 12b is inserted in the input portion of the control power supply circuit 14.

Next, the operation of the power conversion device according to the present embodiment configured as described above will be described.

In FIG. 4, when the cover 8 is rotated around the hinge and opened, the second contact 12b becomes the conductor 10 of FIG.
The connection by b is opened and the control power supply circuit 14 is turned off, that is, the connection by the conductor between the second contacts 12b is lost, the input of the control power supply is turned off, and the switching of the semiconductor element of the power conversion device is stopped. The excitation of the coil 5 of the input contactor is turned off and stopped.

Further, the insulating plate 9b between the first contacts 11a
Disappear, the first contact points 11a come into contact with each other by the restoring force of the leaf spring, and the electric charge of the filter capacitor 4 is short-circuited by the discharge resistor 13 and discharged.

As a result, even without the discharge contactor, the excitation of the coil 5 of the input contactor is turned off by opening the cover 8 and the charge of the filter capacitor 4 is quickly discharged.

As described above, also in the power converter according to the present embodiment, it is possible to stop the device by opening the cover 8 and quickly discharge the electric charge of the filter capacitor 4 without a discharge contactor. Become.

As a result, it is not necessary to continue to excite the coil 6 of the discharge contactor during the operation of the apparatus as in the conventional case described above, and it is possible to save wasteful control power and save energy.

Further, it is not necessary to provide the discharge contactor and its exciting sequence circuit and exciting circuit.

(Fourth Embodiment) FIG. 5 is a principal part view and a sectional view showing a structural example of a power converter according to the present embodiment. The same elements as those in FIG. 11 are designated by the same reference numerals. The description is omitted, and only different parts will be described here.

In FIG. 5, one end of an insulating plate 9c which is concentric with the opening / closing part of the cover 8 is attached to the back surface of the cover 8 of the main body of the power conversion device which rotates about the hinge. The conductor 10c is attached to one surface of the other end.

The insulating plate 9c is sandwiched between the first contact 11a located between the cover 8 and the conductor 10c, and the second contact 12c is attached to the other end of the insulating plate 9c. The conductor 10c.

Further, one of the first contact points 11a is connected to the one shown in FIG.
Connect the discharge resistor 13 of the filter capacitor 4 shown in
The other of the first contacts 11a is connected to the filter capacitor 4
Is connected to the side to which the discharge resistor 13 is not connected.

Furthermore, the second contact 12c is inserted in the input section of the control power supply circuit 14.

Next, the operation of the power converter according to the present embodiment configured as described above will be described.

In FIG. 5, when the cover 8 is rotated around the hinge and opened, the second contact 12c becomes the conductor 10 of FIG.
The connection by c is opened and the control power supply circuit 14 is turned off, that is, the connection by the conductor between the second contacts 10c is lost, the input of the control power supply is turned off, and the switching of the semiconductor element of the power conversion device is stopped. The excitation of the coil 5 of the input contactor is turned off and stopped.

Further, the insulating plate 9c between the first contacts 11a
Disappear, the first contact points 11a come into contact with each other by the restoring force of the leaf spring, a discharge circuit is formed, and the electric charge of the filter capacitor 4 is short-circuited by the discharge resistor 13 and discharged.

As a result, even without the discharge contactor, the excitation of the coil 5 of the input contactor is turned off by opening the cover 8 and the electric charge of the filter capacitor 4 is quickly discharged.

As described above, also in the power converter according to this embodiment, it is possible to stop the device by opening the cover 8 and quickly discharge the electric charge of the filter capacitor 4 without a discharge contactor. Become.

As a result, it is not necessary to continue to excite the coil 6 of the discharge contactor during the operation of the apparatus as in the conventional case described above, and it is possible to save unnecessary control power and save energy.

Further, it is not necessary to provide the discharge contactor and its exciting sequence circuit and exciting circuit.

(Fifth Embodiment) FIG. 6 is a main part diagram showing a structural example of a power converter according to the present embodiment. The same elements as those in FIGS. 1 and 2 are designated by the same reference numerals. The description is omitted, and only different parts will be described here.

That is, as shown in FIG. 6, in the power converter of the present embodiment, the conductor 10 and the first contact 11 on the insulating plate 9 attached to the back surface of the cover 8 in FIGS. A protrusion 15 made of an insulating material is provided between the and.

Next, in the power converter according to the present embodiment configured as described above, insulation is provided between the conductor 10 on the insulating plate 9 attached to the back surface of the cover 8 and the first contact 11. By providing the protrusions 15 made of an object, the creepage distance can be increased by the protrusions 15.

As described above, in the power converter according to this embodiment, the same effect as that of the first embodiment described above can be obtained, and in addition, the creepage distance can be increased. Becomes

(Sixth Embodiment) FIG. 7 is a main part diagram showing a configuration example of a power conversion device according to the present embodiment. The same elements as those in FIGS. 3 and 2 are designated by the same reference numerals. The description is omitted, and only different parts will be described here.

That is, as shown in FIG. 7, the power converter according to the present embodiment has the conductor 10a on the insulating plate 9a attached to the back surface of the cover 8 in FIGS.
15a made of an insulating material between the first contact 11 and the first contact 11.
Is provided.

Next, in the power converter according to the present embodiment configured as described above, the conductor 10a on the insulating plate 9a attached to the back surface of the cover 8 and the first contact 11 are attached.
Since the protrusion 15a made of an insulating material is provided between and, the creepage distance can be increased by the protrusion 15a.

As described above, in the power conversion device according to this embodiment, it is possible to obtain the same effects as those of the second embodiment described above, and it is also possible to increase the creepage distance. Becomes

(Seventh Embodiment) FIG. 8 is a main part diagram showing a structural example of a power conversion device according to the present embodiment. The same elements as those in FIGS. 4 and 2 are designated by the same reference numerals. The description is omitted, and only different parts will be described here.

That is, as shown in FIG. 8, the power converter of the present embodiment is configured such that the conductor 10b on the insulating plate 9b attached to the back surface of the cover 8 in FIGS.
And the first contact point 11a between the protrusion 15 made of an insulating material.
b is provided.

Next, in the power converter according to the present embodiment configured as described above, the conductor 10b on the insulating plate 9b attached to the back surface of the cover 8 and the first contact 11 are provided.
Since the protrusion 15b made of an insulating material is provided between the protrusion 15a and a, the creepage distance can be increased by the protrusion 15b.

As described above, in the power converter according to this embodiment, it is possible to obtain the same effect as that of the third embodiment described above, and it is also possible to increase the creepage distance. Becomes

(Eighth Embodiment) FIG. 9 is a main part diagram showing a structural example of a power converter according to the present embodiment. The same elements as those in FIGS. 5 and 2 are designated by the same reference numerals. The description is omitted, and only different parts will be described here.

That is, as shown in FIG. 9, the power converter of the present embodiment has a conductor 10c on an insulating plate 9c attached to the back surface of the cover 8 in FIGS.
And the first contact point 11a between the protrusion 15 made of an insulating material.
c is provided.

Next, in the power converter according to the present embodiment configured as described above, the conductor 10c on the insulating plate 9c attached to the back surface of the cover 8 and the first contact 11 are provided.
Since the protrusion 15c made of an insulating material is provided between the protrusion 15c and a, the creepage distance can be increased by the protrusion 15c.

As described above, in the power converter according to this embodiment, it is possible to obtain the same effects as those of the above-described fourth embodiment, and it is possible to increase the creepage distance. Becomes

(Ninth Embodiment) FIG. 10 is a main part diagram showing a configuration example of a power conversion device according to the present embodiment.
The same elements as those in FIGS. 1 and 2 are designated by the same reference numerals, and the description thereof will be omitted. Here, only different portions will be described.

That is, as shown in FIG. 10, the power converter of the present embodiment has a structure in which the second contact 12 in FIGS. 1 and 2 is inserted into the start command circuit 16.

Next, the operation of the power converter according to the present embodiment configured as described above will be described.

In FIG. 10, when the start switch 17 is turned on, the start command is input to the start command circuit 16 via the second contact 12 to start the power converter.

When the cover 8 rotates around the hinge and opens, the connection of the second contact 12 by the conductor 10 of FIG. 1 is released, the start command is turned off, and the power converter stops switching of the semiconductor element. At the same time, the excitation of the coil 5 of the input contactor is turned off and stopped.

Further, the first contacts 11 contact each other to form a discharge circuit, and the charge of the filter capacitor 4 becomes
It is short-circuited by the discharge resistor 13 and discharged.

As a result, by turning off the start command at the second contact 12, the current flowing through the second contact 12 can be reduced, the breaking current can be reduced, and the contact damage can be reduced. .

As described above, in the power converter according to the present embodiment, it is possible to obtain the same effect as that of the above-described first embodiment, and in addition, the current flowing through the second contact 12 is increased. Can be reduced.

(Tenth Embodiment) The power converter of the present embodiment is similar to the above-described ninth embodiment in the above-described second embodiment, except that in FIG. 3 and FIG.
The second contact 12a in 1 is inserted into the start command circuit 16.

Next, the operation of the power converter according to the present embodiment having the above structure will be described.

When the start switch 17 is turned on, the start command is input to the start command circuit 16 via the second contact 12a to start the power converter.

When the cover 8 is rotated around the hinge and opened, the connection of the second contact 12a by the conductor 10a of FIG. 3 is released, the start command is turned off, and the power conversion device stops the switching of semiconductor elements. At the same time, the excitation of the coil 5 of the input contactor is turned off and stopped.

Further, the first contacts 11 contact each other to form a discharge circuit, and the charge of the filter capacitor 4 becomes
It is short-circuited by the discharge resistor 13 and discharged.

As a result, the start command is sent to the second contact 12a.
By turning it off at 2, the current flowing through the second contact 12a can be reduced, the breaking current is small, and the contact damage can be reduced.

As described above, in the power converter according to this embodiment, the same effect as that of the second embodiment described above can be obtained, and in addition, the second contact 12a is provided.
It is possible to reduce the energizing current of the.

(Eleventh Embodiment) The power converter of the present embodiment is similar to the ninth embodiment described above in the above-described third embodiment except that the power conversion apparatus shown in FIGS.
The second contact 12b in is inserted into the start command circuit 16.

Next, the operation of the power converter according to the present embodiment having the above-described structure will be described.

When the activation switch 17 is turned on, the activation command is input to the activation command circuit 16 via the second contact 12b, and the power conversion device is activated.

When the cover 8 rotates around the hinge and opens, the connection of the second contact 12b by the conductor 10b of FIG. 4 is released and the start command is turned off, so that the power conversion device stops switching of semiconductor elements. At the same time, the excitation of the coil 5 of the input contactor is turned off and stopped.

Further, the first contact points 11a contact each other,
A discharge circuit is formed, and the charge of the filter capacitor 4 is short-circuited by the discharge resistor 13 and discharged.

As a result, the start command is sent to the second contact 12b.
By turning it off at, the current flowing through the second contact 12b can be reduced, the breaking current is small, and the contact damage can be reduced.

As described above, in the power converter according to this embodiment, the same effect as that of the above-described third embodiment can be obtained, and in addition, the second contact 12b can be obtained.
It is possible to reduce the energizing current of the.

(Twelfth Embodiment) The power converter of the present embodiment is similar to that of the ninth embodiment described above in the above-described fourth embodiment except that the power conversion apparatus shown in FIGS.
The second contact 12c in is inserted into the start command circuit 16.

Next, the operation of the power converter according to the present embodiment configured as described above will be described.

When the activation switch 17 is turned on, the activation command is input to the activation command circuit 16 via the second contact 12c, and the power conversion device is activated.

When the cover 8 rotates around the hinge and opens, the connection of the second contact 12c by the conductor 10c of FIG. 5 is released and the start command is turned off, so that the power conversion device stops switching of semiconductor elements. At the same time, the excitation of the coil 5 of the input contactor is turned off and stopped.

Furthermore, the first contact points 11a contact each other,
A discharge circuit is formed, and the charge of the filter capacitor 4 is short-circuited by the discharge resistor 13 and discharged.

Thus, the start command is sent to the second contact 12c.
By turning it off at, the current flowing through the second contact 12c can be reduced, the breaking current is small, and the contact damage can be reduced.

As described above, in the power converter according to this embodiment, it is possible to obtain the same effects as those of the above-described fourth embodiment, and in addition, the second contact 12c is provided.
It is possible to reduce the energizing current of the.

(Thirteenth Embodiment) A power converter according to the present embodiment is similar to the ninth embodiment described above in the fifth embodiment described above with reference to FIGS.
The second contact 12 is inserted into the start command circuit 16.

Next, in the power converter according to the present embodiment configured as described above, by inserting the second contact 12 into the start command circuit 16, the second contact 1
It is possible to reduce the energization current of No. 2, the breaking current is small, and the contact damage can be reduced.

As described above, in the power converter according to this embodiment, it is possible to obtain the same effects as those of the above-described fifth embodiment, and in addition, the current flowing through the second contact 12 is Can be reduced.

(Fourteenth Embodiment) A power converter according to the present embodiment is similar to the ninth embodiment described above in the sixth embodiment described above with reference to FIGS.
The second contact 12a in 1 is inserted into the start command circuit 16.

Next, in the power converter according to the present embodiment configured as described above, by inserting the second contact 12a into the start command circuit 16, the energizing current of the second contact 12a is changed. It can be made small, the breaking current is small, and the contact damage can be reduced.

As described above, in the power converter according to this embodiment, it is possible to obtain the same effects as in the above-described sixth embodiment, and in addition, the second contact 12a is used.
It is possible to reduce the energizing current of the.

(Fifteenth Embodiment) A power conversion device according to the present embodiment is similar to the ninth embodiment described above in the seventh embodiment described above, except that in FIG. 8 and FIG.
The second contact 12b in is inserted into the start command circuit 16.

Next, in the power converter according to the present embodiment configured as described above, by inserting the second contact 12b into the start command circuit 16, the energizing current of the second contact 12b is changed. It can be made small, the breaking current is small, and the contact damage can be reduced.

As described above, in the power conversion device according to this embodiment, the same effect as that of the seventh embodiment described above can be obtained, and in addition, the second contact 12b can be obtained.
It is possible to reduce the energizing current of the.

(Sixteenth Embodiment) The power converter of the present embodiment is similar to that of the ninth embodiment described above in the above-described eighth embodiment except that shown in FIGS.
The second contact 12c in is inserted into the start command circuit 16.

Next, in the power converter according to the present embodiment configured as described above, by inserting the second contact 12c into the start command circuit 16, the energizing current of the second contact 12c is changed. It can be made small, the breaking current is small, and the contact damage can be reduced.

As described above, in the power converter according to this embodiment, it is possible to obtain the same effects as in the above-described eighth embodiment, and in addition, the second contact 12c is provided.
It is possible to reduce the energizing current of the.

(Other Embodiments) The present invention is not limited to the above-mentioned embodiments, and can be variously modified and implemented at the stage of implementation without departing from the spirit thereof. Is. In addition, the respective embodiments may be implemented in combination as appropriate as possible, and in that case, combined operation effects can be obtained. Further, the above-described embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent features. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the problem (at least one) described in the section of the problem to be solved by the invention can be solved, and When the effect (at least one) described in the section can be obtained, a structure in which this constituent element is deleted can be extracted as an invention.

[0129]

As described above, according to the power converter of the present invention, it is possible to stop the device by opening the cover and quickly discharge the electric charge of the filter capacitor without using the discharge contactor. Becomes

[Brief description of drawings]

FIG. 1 is a main part view and a cross-sectional view showing a first embodiment of a power conversion device according to the present invention.

FIG. 2 is a circuit diagram showing a first embodiment of a power conversion device according to the present invention.

FIG. 3 is a main part view and a cross-sectional view showing a second embodiment of a power conversion device according to the present invention.

FIG. 4 is a main part view and a cross-sectional view showing a third embodiment of a power conversion device according to the present invention.

FIG. 5 is a main part view and a cross-sectional view showing a fourth embodiment of a power conversion device according to the present invention.

FIG. 6 is a main part diagram showing a fifth embodiment of a power conversion device according to the present invention.

FIG. 7 is a main part diagram showing a sixth embodiment of a power conversion device according to the present invention.

FIG. 8 is a main part diagram showing a seventh embodiment of a power conversion device according to the present invention.

FIG. 9 is a main part diagram showing an eighth embodiment of a power conversion device according to the present invention.

FIG. 10 is a main part diagram showing a ninth embodiment of a power conversion device according to the present invention.

FIG. 11 is a circuit diagram showing a configuration example of a conventional power conversion device.

[Explanation of symbols]

1 ... switch 2 ... Input contactor 3 ... Main contact of discharge contactor 4 ... Filter capacitor 5 ... Coil of input contactor 2 6 ... Discharge contactor coil 7 ... Control circuit 8 ... Cover 9, 9a, 9b, 9c ... Insulating plate 10, 10a, 10b, 10c ... Conductor 11, 11a ... first contact 12, 12a, 12b, 12c ... Second contact 13 ... Discharge resistance 14 ... Control power supply circuit 15 ... Insulation protrusion 16 ... Start command circuit 17 ... Start switch 18 ... High resistance discharge circuit.

Claims (6)

[Claims] 1. A power conversion device body rotating about a hinge, wherein one end of an insulating plate is attached to the back surface of the cover, and conductors are attached to both sides of the other end of the insulating plate. Between the first contacts located between
The insulating plate is sandwiched, the conductor attached to the other end of the insulating plate is sandwiched between the second contacts, and the discharge resistor of the filter capacitor is connected to one of the first contacts. The power conversion device is characterized in that the other of the contacts is connected to the side of the filter capacitor to which the discharge resistance is not connected, and the second contact is inserted into the input section of the control power supply circuit. 2. An end portion of an insulating plate is attached to a back surface of a cover of a power conversion device body that rotates about a hinge, and a conductor is attached to one surface of the other end portion of the insulating plate. Between the first contacts located between
The insulating plate is sandwiched, the second contact is brought into contact with a conductor attached to the other end of the insulating plate, and the discharge resistance of the filter capacitor is connected to one of the first contacts, The power conversion device, wherein the other of the contacts is connected to the side of the filter capacitor to which the discharge resistance is not connected, and the second contact is inserted into the input section of the control power supply circuit. 3. An end portion of an insulating plate that is concentric with the opening / closing portion of the cover is attached to the back surface of the cover of the power conversion device main body that rotates around a hinge, and both ends of the other end of the insulating plate are attached. , Attaching a conductor, between a first contact located between the cover and the conductor,
The insulating plate is sandwiched, the conductor attached to the other end of the insulating plate is sandwiched between the second contacts, and the discharge resistor of the filter capacitor is connected to one of the first contacts. The power conversion device is characterized in that the other of the contacts is connected to the side of the filter capacitor to which the discharge resistance is not connected, and the second contact is inserted into the input section of the control power supply circuit. 4. One end of an insulating plate, which is concentric with the opening / closing part of the cover, is attached to the back surface of the cover of the main body of the electric power converter that rotates around a hinge, and one end of the other end of the insulating plate is attached. , Attaching a conductor, between a first contact located between the cover and the conductor,
The insulating plate is sandwiched, the second contact is brought into contact with a conductor attached to the other end of the insulating plate, and the discharge resistance of the filter capacitor is connected to one of the first contacts, The power conversion device, wherein the other of the contacts is connected to the side of the filter capacitor to which the discharge resistance is not connected, and the second contact is inserted into the input section of the control power supply circuit. 5. The method according to any one of claims 1 to 4.
The power converter according to the item 1, wherein a projection made of an insulator is provided between the conductor of the insulating plate attached to the back surface of the cover and the first contact. 6. The method according to any one of claims 1 to 5.
The power converter according to the item 1, wherein the second contact is inserted in a start command circuit.