JP3170368B2 - 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 an inverter device using a self-extinguishing type semiconductor device.

[0002]

2. Description of the Related Art When a self-extinguishing type semiconductor device constituting a conventional inverter device is applied with a device having restrictions on a voltage rising rate and a current rising rate, for example, a GTO thyristor (hereinafter abbreviated as GTO), a voltage and a current are reduced. Requires a snubber circuit to suppress the rise rate. In order to prevent loss of energy stored in the snubber circuit, an inverter device having means for regenerating the energy into a DC power supply has been disclosed in Japanese Unexamined Patent Publication No. 59-1659.
No. 54 discloses this.

FIG. 9 shows a wiring diagram of such a conventional inverter device. This circuit is a self-extinguishing type semiconductor device 1
GTO is applied as A and 1B. GTO1A,
Connected in anti-parallel to 1B are freewheeling diodes 2A and 2B. In recent years, a reverse conducting GTO in which a GTO and a freewheel diode are integrated has also been developed, and when it is applied, the freewheel diodes 2A and 2B can be omitted.

The DC power supply 3 has a DC bus P connected to the positive side and a DC bus N connected to the negative side. The output is obtained from the output terminal X. With respect to the voltage applied to the GTO 1A at the time of turn-off, an excessive rate of voltage increase is suppressed by allowing the snubber capacitor 4A and the snubber diode 5A to charge the snubber capacitor 4A by bypassing the load current. GTO1 at turn-on
With respect to the current flowing through A, the excessive current increase rate is suppressed by the anode reactor 6. The same applies to GTO1B. In the inverter device of FIG. 9, the energy stored in snubber capacitor 4A and anode reactor 6A is recovered to auxiliary power supply 9A via diode 7A and auxiliary reactor 8A, and stored in snubber capacitor 4B and anode reactor 6B. The energy that has been consumed is the diode 7B, the auxiliary reactor 8B
Through the auxiliary power supply 9B.

[0005]

By the way, the conventional inverter device introduced in FIG. 9 needs to have at least two auxiliary power supplies 9A and 9B at both ends of the DC bus PN.
Although not shown in FIG. 9, two energy regeneration circuits for regenerating the excessive energy recovered by the auxiliary power sources 9A and 9B to the DC power source 3 need to be additionally provided. However, it is required to improve efficiency by preventing loss and to further reduce the size of the inverter device. In addition, auxiliary reactors 8A and 8B are inserted in the snubber energy recovery path, so that the discharge current of snubber capacitors 4A and 4B and anode reactor 6A,
This suppresses the flow of the 6B return current. Therefore,
The snubber energy recovery time becomes longer, and further improvement is desired in order to increase the frequency of the inverter device. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has an inverter device in which an auxiliary power supply and an energy regenerating circuit are reduced to reduce the size, and an auxiliary reactor in a snubber energy recovery path is removed to increase the frequency. The purpose is to provide.

[0007]

According to a first aspect of the present invention, there is provided a self-extinguishing type semiconductor device comprising a self-extinguishing type semiconductor device connected in series between positive and negative buses of a DC power supply as positive and negative arms. In an inverter device in which a diode is connected to each of the elements in antiparallel and the connection point of the positive and negative arms is an output terminal, a snubber diode and a snubber capacitor are connected in series with each self-extinguishing type semiconductor element. A snubber circuit is connected, and a connection point between a snubber diode and a snubber capacitor constituting the snubber circuit on the positive arm side and the positive bus are connected via a diode and a recovery capacitor, and the snubber circuit on the negative arm side is connected. A series body consisting of an auxiliary capacitor, a diode and a reactor is connected in parallel with a snubber diode constituting a snubber circuit, and a capacitor constituting the series body is connected. And the recovery capacitor are connected via a diode to form a closed circuit via the recovery capacitor between the self-extinguishing type semiconductor element forming the positive arm and the positive bus of the DC power supply. And an energy regeneration circuit for extracting energy from the recovery capacitor and regenerating the energy to the DC power supply.

According to a second aspect of the present invention, self-extinguishing semiconductor elements connected in series are connected as positive and negative arms between positive and negative buses of a DC power supply, respectively, and are connected in antiparallel to each of the self-extinguishing semiconductor elements. And a snubber circuit formed by connecting a snubber diode and a snubber capacitor in series with each self-extinguishing type semiconductor element in an inverter device having a connection point between the positive and negative arms as an output terminal. A connection point between a snubber diode and a snubber capacitor forming the snubber circuit on the positive arm side and the negative bus are connected via a diode and a recovery capacitor to form a snubber forming the snubber circuit on the negative arm side. An auxiliary capacitor and a series body composed of a diode and a reactor are connected in parallel with the diode, and a capacitor constituting the series body is connected to the circuit. A capacitor is connected via a diode to form a closed circuit between the self-extinguishing semiconductor element forming the positive arm and the positive bus of the DC power supply via the DC power supply and the recovery capacitor. The present invention relates to an inverter device, in which a reactor is inserted, an energy regenerating circuit for extracting energy from the recovery capacitor and regenerating the energy to the DC power supply is connected.

According to a third aspect of the present invention, a positive / negative bus of a DC power supply is provided.
A self-extinguishing type semiconductor element connected in series
The self-extinguishing type semiconductors are connected as positive and negative arms, respectively.
Connect a diode in anti-parallel to each of the elements, and
Inverter device with arm connection point as output terminal
And a snubber diode in parallel with each self-extinguishing type semiconductor device.
Snubber circuit consisting of a capacitor and a snubber capacitor connected in series
To form the snubber circuit on the negative arm side.
The connection point between the diode and snubber capacitor and the negative side
Connect to the bus via a diode and a recovery capacitor
And a snubber die constituting the snubber circuit on the positive arm side
Auxiliary capacitor, diode and reactor
To form a series body consisting of
Capacitor and the recovery capacitor via a diode.
Self-extinguishing type semiconductor device that connects and connects to form a negative arm
And the recovery capacitor between the negative bus of the DC power supply.
Insert the reactor to form a closed circuit through
Extract the energy from the recovery capacitor and
The fact that the energy regeneration circuit that regenerates the power is connected
The present invention relates to an inverter device.

According to a fourth aspect of the present invention, a positive / negative bus of a DC power supply is provided.
A self-extinguishing type semiconductor element connected in series
The self-extinguishing type semiconductors are connected as positive and negative arms, respectively.
Connect a diode in anti-parallel to each of the elements , and
Inverter device with arm connection point as output terminal
And a snubber diode in parallel with each self-extinguishing type semiconductor device.
Snubber circuit consisting of a capacitor and a snubber capacitor connected in series
To form the snubber circuit on the negative arm side.
The connection point between the diode and snubber capacitor and the positive side
Connect to the bus via a diode and a recovery capacitor
And a snubber die constituting the snubber circuit on the positive arm side
Auxiliary capacitor, diode and reactor
To form a series body consisting of
Capacitor and the recovery capacitor via a diode.
Self-extinguishing type semiconductor device that connects and connects to form a negative arm
And the DC power supply and the circuit between the negative bus of the DC power supply.
React to form a closed circuit via a collecting capacitor
To remove energy from the recovery capacitor.
Connected to the energy regeneration circuit that
The present invention relates to an inverter device characterized by the following.

According to a fifth aspect of the present invention, there is provided an inverter apparatus comprising : a set of a recovery capacitor and an energy regeneration circuit;
Multiple units between the positive and negative DC power buses
And column connection relates to an inverter apparatus characterized by connecting the <br/> recovery capacitor and the energy recovery circuit in common to each of the plurality few cars of the inverter device.

[0012]

In this device, only one recovery capacitor has to be provided by using an auxiliary capacitor connected in parallel with the snubber diode. This recovery capacitor temporarily stores excess energy stored in the snubber capacitor and the anode reactor. Also, one energy regeneration circuit connected to the recovery capacitor regenerates excess energy stored in the recovery capacitor to a DC power supply or the like. It should be noted that the recovery capacitor and the energy regeneration circuit required for each phase can be shared by a plurality of phases.

[0013]

[Embodiment 1] Hereinafter, a first invention of the present invention will be described in detail using an embodiment shown in the drawings. FIG. 1 is a wiring diagram showing an embodiment of the inverter device according to the first invention of the present invention. In the embodiment of this figure,
GTO is applied as an example of the self-extinguishing type semiconductor elements 1A and 1B. Note that, in FIG. 1, the circuit elements corresponding to those in FIG.

In this embodiment, GTOs 1A and 1B connected in series are arranged between the positive and negative buses PN of the DC power supply 3, each of which is a positive / negative arm. Each of the GTOs 1A and 1B connects the freewheeling diodes 2A and 2B in anti-parallel,
An inverter device having an output terminal X as a connection point between the positive arm and the negative arm is configured. An anode reactor 6 is inserted into the series circuit of GTOs 1A and 1B,
Are connected to a snubber circuit in parallel. That is, for example, GT
For O1A, a snubber circuit formed by connecting a snubber capacitor 4A and a snubber diode 5A in series is connected, and the same applies to GTO1B.

A series body including an auxiliary capacitor 11, a diode 12, and an auxiliary reactor 13 is connected in parallel to the snubber diode 5B. Snubber capacitor 4A
And the auxiliary capacitor 11 are connected to one end of the recovery capacitor 10 via diodes 7A and 7B, respectively. The other end of the recovery capacitor 10 is connected to the positive bus P. Further, an energy regeneration circuit 14 that extracts energy from the recovery capacitor 10 and regenerates the energy to the DC power supply 3
It comprises a switch 15, a diode 16, and a reactor 17. Here, the voltage of the DC power supply 3 is E,
The energy recovery circuit 14 controls the recovery capacitor 10 to a constant voltage e with the positive bus P side being negative. The value of the constant voltage e is preferably set to be a fraction of the voltage E of the DC power supply 3. Output terminal X
Is connected to an inductive load (not shown), and the vector of the load current does not change during the switching operation of each GTO.

Next, the operation of the apparatus shown in FIG. 1 will be described. FIG. 2 is an explanatory diagram of a current path for explaining the operation. First, the output terminal X is turned off by turning off the GTO1A.
Circuit operation when changing the voltage of E from 0 to E will be described. In the figure, GTO1A of the positive arm is ON, and G
When TO1B is off, a load current flows from output terminal X through path 1 in the direction of the arrow in the figure. The voltage across snubber capacitor 4A and auxiliary capacitor 11 is zero, and the voltage across snubber capacitor 4B is charged to the sum of voltage E of DC power supply 3 and voltage e of recovery capacitor 10. .

Thereafter, the GTO1A is turned off to cut off the load current, and after a certain short-circuit prevention time, the GTO1A is turned off.
Consider the case where B is turned on. When the GTO 1A is turned off, the interrupted load current is bypassed to the path 2, and the snubber capacitor 4A is connected to the voltage E of the DC power supply 3.
And the voltage e of the recovery capacitor 10. At this time, the snubber capacitor 4A is GTO1A
It absorbs and suppresses the excessive voltage rise rate applied to the power supply. Immediately thereafter, excessive energy is stored in the anode reactor 6, but all of the energy is recovered by the recovery capacitor 10 through the path 3.

When the short circuit prevention time elapses after the GTO 1A is turned off and the GTO 1B is turned on, the snubber capacitor 4B is discharged to zero voltage by the path 4.
At this time, GT is generated by the discharge current of snubber capacitor 4B.
The excessive current increase rate applied to O1B is caused by the auxiliary reactor 13
Is suppressed. Even if the snubber capacitor 4B finishes discharging, the energy is transferred to the auxiliary capacitor 11 by the path 5 because the energy is excessively accumulated in the auxiliary reactor 13. Therefore, the energy stored in the snubber capacitor 4B in this process is transferred to the auxiliary capacitor 11 via the auxiliary reactor 13. The charging voltage of the auxiliary capacitor 11 at this time is e1. Further, the charging voltage of the snubber capacitor 4A becomes the voltage E
Then, the freewheel diode 2B conducts. Through this entire process, the load current flows through the path 6, and the circuit operation for changing the voltage of the output terminal X from E to 0 by turning off the GTO 1A ends.

Next, a circuit operation when the voltage of the output terminal X is changed from 0 to E by turning off the GTO 1B will be described. In the figure, it is assumed that the GTO 1A of the positive arm is off, the GTO 1B of the negative arm is on, and a load current flows from the output terminal X through the path 6 in the direction of the arrow in the figure. The voltage of the snubber capacitor 4B is zero, the voltage of the snubber capacitor 4A is
It has been charged to the sum of the voltage e and 0. From the state where the auxiliary capacitor 11 is charged to the voltage e1, GTO1
B is turned off, and after a certain short-circuit prevention time, GT
Consider the case where O1A is turned on. Where GT
Even if O1B is turned off, the circuit state does not change because the load current flows from the output terminal X in the direction of the arrow in FIG.

When the GTO 1A is turned on, the voltage E of the DC power supply 3 is applied to the anode reactor 6,
The load current starts to be supplied through the path 1 while the excessive current increase rate applied to the GTO 1A is suppressed by the anode reactor 6. After that, the current flowing through the GTO 1A exceeds the load current.
The charging current becomes B, and the snubber capacitor 4B is charged by the path 7 up to the sum of the voltage E of the DC power supply 3 and the voltage e of the recovery capacitor 10. Further, the snubber capacitor 4A is discharged by the path 8, and the snubber capacitor 4A is discharged.
The energy stored in the recovery capacitor 10 is recovered by the recovery capacitor 10 through the path 8. At this time, when the snubber capacitor 4A is discharged to the voltage e1, the diode 7B becomes conductive, so that the auxiliary capacitor 11 is discharged through the path 9 simultaneously with the discharge of the snubber capacitor 4A.

Snubber capacitor 4A and auxiliary capacitor 1
Immediately after the completion of the discharge of No. 1, excess energy is stored in the anode reactor 6, but the entire energy is recovered by the recovery capacitor 10 through the path 3. The difference between this circuit and the conventional circuit shown in FIG.
The other point is that the route 8 and the route 9 do not include additional reactors other than the anode reactor 6. Therefore, the time for collecting the snubber energy to the recovery condenser 10 is reduced. The load current flows through the path 1 through the above process, and the circuit operation when the voltage at the output terminal X changes from 0 to E by turning off the GTO 1B is completed. Note that the switching operation of each of the GTOs 1A and 1B when the load current flows in the output terminal X in the direction opposite to the arrow in the figure is completely symmetric with the switching operation when the load current flows in the direction of the arrow in the figure. Therefore, the description is omitted.

Next, the operation of the energy regeneration circuit 14 will be described. In the device of the present invention, the configuration itself of the energy regeneration circuit 14 is not limited to this, but will be described as a practical circuit example. As shown in the drawing, the energy regeneration circuit 14 is configured by the switch 15, the diode 16, and the reactor 17. This circuit has a function of extracting energy from the recovery capacitor 10 and regenerating it to the DC power supply 3 to control the charging voltage of the recovery capacitor 10 to a constant value e.

Hereinafter, the operation of this circuit will be described. First, the switch 15 is turned on, and the energy stored in the recovery capacitor 10 through the path 10 is discharged to the reactor 17. Next, switch 1 is used to cut off the discharge current.
When the switch 5 is turned off, a current flows through the path 11 due to the energy stored in the reactor 17, and the energy is regenerated to the DC power supply 3. By controlling the ON / OFF period or the cycle of the switch 15 by the voltage of the recovery capacitor 10, it is possible to regenerate energy to the DC power supply 3 while keeping the charging voltage of the recovery capacitor 10 constant. Of course, it is apparent that similar effects can be obtained by applying a known DC-DC power conversion circuit other than the circuit shown in FIG. In addition,
The anode reactor 6 and the auxiliary reactor 13 do not necessarily need to be independently provided as constituent elements, and can be replaced by wiring inductance depending on the performance of the self-extinguishing type semiconductor element in some cases.

Embodiment 2 Hereinafter, an embodiment of the second invention of the present invention will be described with reference to the drawings. FIG. 3 is a connection diagram showing an embodiment of the inverter device according to the second invention of the present invention. In this example,
GTO is applied as an example of the self-extinguishing type semiconductor elements 1A and 1B. In FIG. 3, circuit elements corresponding to those in FIGS. 1 and 9 are denoted by the same reference numerals and described.

In this embodiment, the positive / negative bus PN of the DC power supply 3
GTOs 1A and 1B connected in series are arranged between them, each of which is a positive / negative arm. Each of the GTOs 1A and 1B is connected to an inverter device having anti-parallel freewheel diodes 2A and 2B connected thereto and having a connection point between the positive arm and the negative arm as an output terminal X. An anode reactor 6 is inserted in the series circuit of GTOs 1A and 1B, and each G
A snubber circuit is connected in parallel with TO. That is, for example, G
For TO1A, a snubber circuit formed by connecting a snubber capacitor 4A and a snubber diode 5A in series is connected, and the same applies to GTO1B.

The snubber diode 5B is connected in parallel with a series body composed of an auxiliary capacitor 11, a diode 12, and an auxiliary reactor 13. Snubber capacitor 4A
And the auxiliary capacitor 11 are connected to one end of the recovery capacitor 10 via diodes 7A and 7B, respectively. One end of the recovery capacitor 10 is connected to the negative bus N. An energy regeneration circuit 14 that extracts energy from the recovery capacitor 10 and regenerates the energy to the DC power supply 3 includes a switch 15, a diode 16, and a reactor 17. Here, the voltage of the DC power supply 3 is E, and the recovery capacitor 10 is controlled by the energy regenerating circuit 14 to a constant voltage e with the positive bus P side being negative. It is assumed that an inductive load (not shown) is connected to the output terminal X, and the vector of the load current does not change during the switching operation of each GTO. The value of the constant voltage e is preferably a voltage E of the DC power supply 3 and a fraction of the voltage E of the DC power supply 3.
Is set so as to be the sum of the voltage values.

Next, the operation of the apparatus shown in FIG. 3 will be described. FIG. 4 is an explanatory diagram of the circuit operation, in which the paths shown in the description of FIG. 3 are collectively described. First, a circuit operation when the voltage at the output terminal X is changed from E to 0 by turning off the GTO 1A will be described. In the figure, GTO1A of the positive arm
Is on, the GTO1B of the negative arm is off, and path 1
It is assumed that a load current flows from the output terminal X in the direction of the arrow in the figure. The voltage of each of the snubber capacitor 4A and the auxiliary capacitor 11 is zero, and the voltage of the snubber capacitor 4B is charged to the voltage e of the recovery capacitor 10. GT
Consider a case where O1A is turned off to cut off the load current, and GTO1B is turned on after a certain short-circuit prevention time.

When the GTO 1A is turned off, the interrupted load current is bypassed to the path 2, and the snubber capacitor 4A is charged to the voltage e of the recovery capacitor 10. At this time, snubber capacitor 4A suppresses an excessive voltage increase rate applied to GTO 1A. Immediately after that, excessive energy is stored in the anode reactor 6,
All the energy is recovered by the path 3 through the recovery condenser
Will be collected. When the GTO 1A is turned off and the GTO 1B is turned on after the short circuit prevention time, the snubber capacitor 4B is discharged to zero voltage by the path 4. At this time, GTO1B is generated by the discharge current of snubber capacitor 4B.
The excessive current increase rate applied to the power supply is suppressed by the auxiliary reactor 13.

Even if the snubber capacitor 4B finishes discharging, the energy is excessively stored in the auxiliary reactor 13, and the energy is transferred to the auxiliary capacitor 11 through the path 5. Therefore, the energy stored in the snubber capacitor 4B in this process is reduced to the auxiliary reactor 13B.
To the auxiliary capacitor 11 via the The charging voltage of the auxiliary capacitor 11 at this time is e1.
Further, when the charging voltage of the snubber capacitor 4A becomes equal to or higher than the voltage E, the freewheel diode 2B conducts. Through this entire process, the load current flows through the path 6, and the circuit operation for changing the voltage of the output terminal X from E to 0 by turning off the GTO 1A ends.

Next, a circuit operation when the output terminal voltage is changed from 0 to E by turning off the GTO 1B will be described. In the figure, it is assumed that the GTO 1A of the positive arm is off, the GTO 1B of the negative arm is on, and a load current flows from the output terminal X through the path 6 in the direction of the arrow in the figure.
The voltage of the snubber capacitor 4B is zero,
The voltage of A is charged to the voltage e of the recovery capacitor 10. Consider a case where the GTO 1B is turned off from the state where the auxiliary capacitor 11 is charged to the voltage e1, and the GTO 1A is turned on after a certain short-circuit prevention time.
Here, even if the GTO 1B is turned off, the circuit state does not change because the load current flows from the output terminal X through the path 5 in the direction of the arrow in the figure.

When the GTO 1A is turned on, the voltage E of the DC power supply 3 is applied to the anode
The load current starts to be supplied through the path 1 while the excessive current increase rate of the TO1A is suppressed by the anode reactor 6. Thereafter, the current flowing through the GTO 1A becomes equal to or more than the load current, but the excess current becomes the charging current of the snubber capacitor 4B, and the snubber capacitor 4B is charged by the path 7 to the voltage e of the recovery capacitor 10. Further, the snubber capacitor 4A is discharged through the path 8, and the energy stored in the snubber capacitor 4A is recovered by the recovery capacitor 10 through the path 8. At this time, when the snubber capacitor 4A is discharged to the voltage e1, the diode 7B becomes conductive, so that the auxiliary capacitor 11 is discharged through the path 9 simultaneously with the discharge of the snubber capacitor 4A.

Snubber capacitor 4A and auxiliary capacitor 1
Immediately after the completion of the discharge of No. 1, excess energy is stored in the anode reactor 6, but the entire energy is recovered by the recovery capacitor 10 through the path 3. The difference between this circuit and the conventional circuit shown in FIG.
The other point is that the route 8 and the route 9 do not include additional reactors other than the anode reactor 6. Therefore, the time for collecting the snubber energy to the recovery condenser 10 is reduced.

The load current flows through the path 1 through the above process, and the circuit operation for changing the voltage of the output terminal X from 0 to E by turning off the GTO 1B ends. Note that the switching operation of each of the GTOs 1A and 1B when the load current flows in the output terminal X in the direction opposite to the arrow in the figure is completely symmetric with the switching operation when the load current flows in the direction of the arrow in the figure. Therefore, the description is omitted. The configuration of the energy regeneration circuit 14 is the same as that shown in FIG.

Embodiment 3 FIGS. 5 and 6 are connection diagrams showing an embodiment of the inverter device according to the third invention of the present invention. In FIG. 5, a polyphase inverter is configured by combining two inverter devices shown in FIG. In this case, the recovery capacitor 10 and the energy recovery circuit 14 connected to the recovery capacitor 10 are commonly connected to a plurality of phases. The basic operation of the circuit is exactly the same as that described in detail in the first and second embodiments, and a description thereof will be omitted. As described above, since the recovery capacitor 10 and the energy regenerating circuit 14 can be shared even when the number of phases is increased, it is possible to prevent an increase in the size of the inverter and prevent energy loss. FIG. 6 shows a combination of two inverter devices shown in FIG. 3, which also has the same function.

Embodiment 4 FIGS. 7 and 8 are connection diagrams of modified examples of the apparatus shown in FIGS. 1 and 3, respectively. FIG. 7 shows a case where the insertion position of the anode reactor 6 provided in the apparatus of FIG. 1 is on the side of the negative bus N. FIG. 8 shows a case where the insertion position of the anode reactor 6 provided in the apparatus of FIG. 3 is on the side of the negative bus N. The circuit configuration is symmetrical in positive and negative directions, and the basic operation of the circuit is exactly the same as that described in detail in the first and second embodiments, and a description thereof will be omitted. As shown in FIGS. 5 and 6 of the third embodiment, FIGS.
It is needless to say that the recovery capacitor 10 can be connected in common for a plurality of phases.

[0036]

The inverter device according to the present invention described above requires only one recovery capacitor by using an auxiliary capacitor connected in parallel with a snubber diode. Therefore, only one anode reactor can be used. It is sufficient to provide only one energy regenerating circuit for regenerating excessive energy to the DC power supply. Therefore, the number of components can be reduced, and the size of the inverter device can be reduced. Further, since the recovery capacitor and the energy regeneration circuit can be connected in common in a plurality of phases, there is an effect that the device can be miniaturized in the case of multi-phase.

Further, since it is not necessary to insert an additional reactor into the path for recovering the snubber energy to the recovery condenser, the snubber energy recovery time can be shortened, and the frequency of the inverter can be increased. In addition, when such an inverter device is applied to a converter device and an induction motor is driven as a converter / inverter system, there is an effect that loss is small, running cost is reduced, and energy saving of the entire system is achieved.

[Brief description of the drawings]

FIG. 1 is a connection diagram showing an embodiment of an inverter device according to the first invention of the present invention.

FIG. 2 is an explanatory diagram of a current path showing an operation of the first invention.

FIG. 3 is a connection diagram showing an embodiment of the inverter device according to the second invention of the present invention.

FIG. 4 is a current path explanatory diagram showing the operation of the second invention.

FIG. 5 is a connection diagram showing an embodiment of the inverter device according to the third invention of the present invention.

FIG. 6 is a connection diagram showing another embodiment of the inverter device according to the third invention of the present invention.

FIG. 7 is a connection diagram showing another embodiment of the inverter device according to the first invention of the present invention.

FIG. 8 is a connection diagram showing another embodiment of the inverter device according to the second invention of the present invention.

FIG. 9 is a connection diagram showing a conventional inverter device.

[Explanation of symbols]

1A, 1B GTO (self-extinguishing type semiconductor element), 2A,
2B freewheel diode, 3 DC power supply, 4
A, 4B snubber capacitor, 5A, 5B snubber diode, 6 anode reactor, 7A, 7B diode, 10 recovery capacitor, 11 auxiliary capacitor,
12 diode, 13 auxiliary reactor, 14 energy regeneration circuit, 15 switch, 16 diode,
17 Reactor, P Positive DC bus, N Negative DC bus, X output terminal.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-4-351473 (JP, A) JP-A-64-60265 (JP, A) JP-A-61-100023 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H02M ⁷ /42-7/98

Claims (5)

(57) [Claims] 1. A self-extinguishing semiconductor device connected in series as a positive / negative arm between positive and negative buses of a DC power supply, and a diode connected in antiparallel to each of the self-extinguishing semiconductor devices. In the inverter device having a connection point of the positive and negative arms as an output terminal, a snubber circuit in which a snubber diode and a snubber capacitor are connected in series is connected in parallel with each self-extinguishing type semiconductor element, and a positive arm side is connected. The connection point between the snubber diode and the snubber capacitor constituting the snubber circuit, and the positive bus,
A capacitor connected to a series body including an auxiliary capacitor, a diode, and a reactor, connected in parallel with a snubber diode forming the snubber circuit on the negative arm side, and a capacitor forming the series body; A recovery capacitor is connected via a diode, and a reactor is inserted between the self-extinguishing type semiconductor element forming the positive arm and the positive bus of the DC power supply so as to form a closed circuit via the recovery capacitor. And an energy regeneration circuit for extracting energy from the recovery capacitor and regenerating the energy to the DC power supply. 2. A self-extinguishing type semiconductor device connected in series as a positive / negative arm between positive and negative buses of a DC power supply, and a diode connected in anti-parallel to each of the self-extinguishing type semiconductor devices. In the inverter device having a connection point of the positive and negative arms as an output terminal, a snubber circuit in which a snubber diode and a snubber capacitor are connected in series is connected in parallel with each self-extinguishing type semiconductor element, and a positive arm side is connected. A connection point between a snubber diode and a snubber capacitor constituting the snubber circuit, and the negative bus,
A capacitor connected to a series body including an auxiliary capacitor, a diode, and a reactor, connected in parallel with a snubber diode forming the snubber circuit on the negative arm side, and a capacitor forming the series body; A recovery capacitor is connected via a diode to form a closed circuit between the self-extinguishing semiconductor element forming the positive arm and the positive bus of the DC power supply via the DC power supply and the recovery capacitor. An energy recovery circuit for extracting an energy from the recovery capacitor and regenerating the energy to the DC power supply. 3. A series connection between the positive and negative buses of a DC power supply.
The connected self-extinguishing type semiconductor elements are
And connected in anti-parallel to each of the self-extinguishing semiconductor elements.
To the positive and negative arm connection points.
In the inverter device as a power terminal, a snubber diode is connected in parallel with each self-turn-off type semiconductor element.
Connect a snubber circuit consisting of a series connection of snubber capacitors.
And a snubber diode constituting the snubber circuit on the negative arm side.
And the connection point of the snubber capacitor and the negative bus,
A snubber diode connected to a diode and a recovery capacitor to constitute the snubber circuit on the positive arm side.
In parallel with the auxiliary capacitor, diode and reactor
A capacitor connected in series body, constituting the series body comprising the recovery capacitor
The self-extinguishing type semiconductor element forming a negative arm is connected to the DC power supply
Closed circuit between the negative bus of the source via the recovery capacitor
Insert the reactor so as to constitute the said extracts energy from the recovery capacitor straight
Power regeneration circuit connected to the power supply
Features inverter device. 4. A series connection between the positive and negative buses of the DC power supply.
The connected self-extinguishing type semiconductor elements are
And connected in anti-parallel to each of the self-extinguishing semiconductor elements.
To the positive and negative arm connection points.
In the inverter device as a power terminal, a snubber diode is connected in parallel with each self-turn-off type semiconductor element.
Connect a snubber circuit consisting of a series connection of snubber capacitors.
And a snubber diode constituting the snubber circuit on the negative arm side.
And the connection point of the snubber capacitor and the positive-side bus,
A snubber diode connected to a diode and a recovery capacitor to constitute the snubber circuit on the positive arm side.
In parallel with the auxiliary capacitor, diode and reactor
A capacitor connected in series body, constituting the series body comprising the recovery capacitor
The self-extinguishing type semiconductor element forming a negative arm is connected to the DC power supply
The DC power supply and the recovery capacitor between the negative bus of the source
Insert the reactor so as to constitute a closed circuit through the extracts energy from the recovery capacitor straight
Power regeneration circuit connected to the power supply
Features inverter device. 5. The inverter device according to any one of claims 1-4, a set of recovery capacitor and the energy dose
By sharing the raw circuit, the DC power supply
Several units are connected in parallel, and each of the plurality of inverter units
Inverter apparatus characterized by connecting the recovery capacitor and the energy recovery circuit in common to.