JP2000078850A - Inverter device and control method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the life of a smoothing capacitor and reduce the size of an inverter device. SOLUTION: A 1st current command signal generating means which generates a 1st current command signal for driving a motor, a 1st pulse width modulation signal generating means 55 which generates 1st pulse width modulation signals PMU, PMV and PMW, a 2nd current command generating means which generates a 2nd current command signal for driving a generator and a 2nd pulse width modulation signal generating means 65 which generates 2nd pulse width modulation signals PGU, PGV and PGW are provided. The 1st and 2nd pulse width modulation signal generating means 55 and 65 generate the 1st pulse width modulation signal PMU, PMV and PMW and the 2nd pulse width modulation signals PGU, PGV and PGW with different ON/OFF timings. It can be avoided that the transistor of an inverter for a motor and the transistor of an inverter for a generator are turned on/turned off simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an inverter device and a control method thereof.

[0002]

2. Description of the Related Art Conventionally, an electric vehicle is provided with an inverter device, in which an inverter formed by a bridge circuit is driven.
A phase current of the phase is generated, and the phase current is supplied to the motor. For this purpose, a control device is provided, the control device generates a pulse width modulation signal, outputs the pulse width modulation signal to the bridge circuit, and switches a transistor of the bridge circuit.

[0003] Among the electric vehicles, a hybrid vehicle is equipped with a motor and a generator, and a motor inverter and a generator inverter are provided as the inverters, and the inverters are independently controlled. In order to mount the motor inverter and the generator inverter in the engine room of the hybrid vehicle, the motor inverter and the generator inverter are integrated and housed in a common inverter case.

[0004] The motor inverter and the generator inverter are designed such that the phase current is instantaneously supplied to the motor when a predetermined transistor of each bridge circuit is turned on. , Batteries, wiring, etc., have an impedance, so that the phase current is not supplied instantaneously. Therefore, when the transistor is turned on, the voltage generated in the bridge circuit decreases.

The motor inverter and the generator inverter are designed so that the phase current is instantaneously stopped when a predetermined transistor of each bridge circuit is turned off. , The phase current is not momentarily stopped because of the impedance. Therefore, when the transistor is turned off, the voltage generated in the bridge circuit increases.

Therefore, it is possible to prevent the voltage generated in the bridge circuit from decreasing when the predetermined transistor is turned on, and to increase the voltage generated in the bridge circuit when the predetermined transistor is turned off. In order to prevent such a situation, a common smoothing capacitor is arranged near each bridge circuit (see Japanese Patent Application Laid-Open No. 9-233831).

[0007]

However, in the conventional inverter device, since a common smoothing capacitor is connected to each bridge circuit of the motor inverter and the generator inverter, the transistors of each bridge circuit are simultaneously turned on. When it turns off or turns on, a large ripple current flows through the smoothing capacitor,
The life of the smoothing capacitor is shortened.

Therefore, it is conceivable to increase the capacity of the smoothing capacitor. However, if the capacity of the smoothing capacitor is increased, the size of the inverter device is correspondingly increased. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the conventional inverter device and to provide an inverter device capable of extending the life of the smoothing capacitor and reducing the size.

[0009]

For this purpose, in the inverter device of the present invention, a motor inverter, a generator inverter, a common smoothing capacitor connected to the motor inverter and the generator inverter, and a motor are provided. First current command signal generating means for generating a first current command signal for driving;
First pulse width modulation signal generating means for generating a first pulse width modulation signal based on the current command signal, and second current command signal generation for generating a second current command signal for driving the generator Means for generating a second pulse width modulation signal based on the second current command signal;
And pulse width modulation signal generating means.

The first and second pulse width modulation signal generating means generate first and second pulse width modulation signals by displacing the on / off timing. In another inverter device of the present invention, further, a first carrier signal generating means for generating a first carrier signal, and a second carrier signal for generating a second carrier signal by displacing a timing with the first carrier signal. 2 carrier signal generating means.

The first pulse width modulation signal generating means compares the first current command signal with a first carrier signal to generate a first pulse width modulation signal, and generates the second pulse width modulation signal. The pulse width modulation signal generation means generates a second pulse width modulation signal by comparing the second current command signal with a second carrier signal. Still another inverter device of the present invention further includes a synchronizing signal generating means for generating a synchronizing signal.

One of the first and second pulse width modulation signal generating means raises the first and second pulse width modulation signals at the timing of the synchronizing signal, and generates the first and second pulse width modulation signals. The other of the width modulation signal generating means falls the first and second pulse width modulation signals at the timing of the synchronization signal. The control method for an inverter device according to the present invention is applied to an inverter device including a motor inverter, a generator inverter, and a common smoothing capacitor connected to the motor inverter and the generator inverter.

A first current command signal for driving the motor is generated, a first pulse width modulation signal is generated based on the first current command signal, and a second current command signal is generated for driving the generator. And the second current command signal is generated.
A second pulse width modulation signal is generated based on the current command signal. Then, the first and second pulse width modulation signals are:
It can be generated by displacing the ON / OFF timing.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a schematic diagram of a main part of the inverter device according to the first embodiment of the present invention, and FIG. 3 is a diagram illustrating a control device of the inverter device according to the first embodiment of the present invention.

In the figure, 11 is a motor as a first rotating electric machine, 12 is a generator as a second rotating electric machine, 13 is a first bridge circuit connected to the motor 11 and constituting a motor inverter, 14 Is a second bridge circuit which is connected to the generator 12 and constitutes a generator inverter arranged in parallel with the first bridge circuit 13; 15 is connected to the first and second bridge circuits 13 and 14 Common smoothing capacitor, 1
Reference numeral 6 denotes a common battery disposed in parallel with the smoothing capacitor 15 and connected to the first and second bridge circuits 13 and 14, and L denotes an L component of the battery 16, wiring and the like.

The motor 11 is rotatably disposed inside the U-phase, V-phase and W-phase stator coils C _MU , C _MV and C _MW , and inside the stator coils C _MU , C _MV and C _MW . It has a rotor, not shown, which comprises at least one pole pair consisting of two poles. In the present embodiment, the motor 11 is constituted by a DC brushless motor, and the rotor has three magnetic pole pairs consisting of two magnetic poles.

When the motor 11 is driven to drive the electric vehicle, the DC current from the battery 16 is converted into each phase current by the first bridge circuit 13, and each phase current is converted into each stator coil _CMU. , C _MV , C _MW . Therefore, the first bridge circuit 13
Comprises arms 21 to 23 of each phase, wherein the transistors 21 and 23 are provided on the arm 21, the transistors Tr 3 and Tr 4 are provided on the arm 22, and the transistors Tr 5 and Tr 6 are provided on the arm 23. Diodes D1 to D6 are connected between the emitters and collectors of Tr1 to Tr6, respectively.

The stator coils C _MU , C _MV ,
By C _MW the neutral point P1 transistors Tr1, Tr2 of the intermediate point P2 is the stator coil C _MU of the intermediate point of the transistors Tr3, Tr4 and the neutral point P1 P3
Bets are the stator coil C _MV, and the neutral point P1 and the middle point P4 of the transistor Tr5, Tr6 are connected to each other by the stator coil C _MW.

A rotor (not shown) of a resolver (RE) 25 is coaxially connected to a rotor shaft (not shown) connected to the rotor. A rotor position calculation circuit 26 is connected to the resolver 25. The rotor position calculation circuit 26 applies an AC voltage to the resolver 25, and receives a resolver signal from the resolver 25 to receive the resolver signal. The position of the magnetic pole is calculated, and a magnetic pole position signal is output to the motor control circuit 27.

Therefore, the vehicle control circuit 28 generates a torque command value at the time of driving the motor so that the motor control circuit 27
, The motor control circuit 27 outputs three-phase pulse width modulation (PW) having a pulse width corresponding to the torque command value.
M) A signal is generated, and the pulse width modulation signal is output to the gate drive circuit 29. The gate drive circuit 29
In response to the pulse width modulation signal, six transistors T
A transistor drive signal for driving r1 to Tr6 is generated and output to the first bridge circuit 13.

The vehicle control circuit 28 receives an accelerator signal, a brake signal, a shift signal, a charging signal, a parking signal, and the like. Reference numeral 30 denotes an auxiliary machine 12
[V] a power supply circuit connected to a power supply;
0 applies a drive voltage to the gate drive circuit 29 and a control power supply voltage to the motor control circuit 27 and the vehicle control circuit 28.

Then, the transistor drive signal causes
In each of the arms 21 to 23, the transistor Tr1
When Tr6 is selectively turned on / off, battery 16
These DC currents are converted into phase currents, and the phase currents are
Each stator coil C_MU, C _MV, C_MWSupplied to the low
Is rotated. On the other hand, the generator 12
U-phase, V-phase and W-phase stator coils C_GU, C_GV,
C_GWAnd the stator coil C_GU, C_GV, C_GWInside
With a rotatable rotor (not shown)
The rotor has at least one pole pair consisting of two poles.
Prepare one.

When the generator 12 is driven to generate power and charge the battery 16, each stator coil C
Each phase current generated in _GU , C _GV , C _GW is converted into a DC current by the second bridge circuit 14, and the DC current is supplied to the battery 16. To this end, the second bridge circuit 14 includes arms 41 to 43 of each phase,
Transistors Tr11 and Tr12 are provided on the arm 41,
The transistors Tr13 and Tr14 are provided on the arm 42,
Transistors Tr15 and Tr16 are disposed on the arm 43, respectively.
Diodes D11 to D16 are connected between the emitter and the collector of Tr16, respectively.

The stator coils C _GU , C _GV ,
Neutral point P11 of C _GW and transistors Tr11, Tr
Twelve intermediate points P12 are determined by the stator coil _CGU .
The neutral point P11 and the transistors Tr13 and Tr1
4 is connected to the neutral point P11 and the transistors Tr15 and Tr16 by the stator coil C _GV .
Are connected by the stator coil C _GW , respectively.

A rotor (not shown) of a resolver (RE) 45 is coaxially connected to a rotor shaft (not shown) connected to the rotor. A rotor position calculation circuit 46 is connected to the resolver 45. The rotor position calculation circuit 46 applies an AC voltage to the resolver 45, and receives a resolver signal from the resolver 45 to calculate the position of the magnetic pole. A magnetic pole position signal is output to the generator control circuit 47.

Therefore, when the vehicle control circuit 28 generates a torque command value when driving the generator and sends it to the generator control circuit 47, the generator control circuit 4
7 has a pulse width corresponding to the torque command value 3
A phase pulse width modulation signal is generated, and the pulse width modulation signal is output to the gate drive circuit 49. The gate drive circuit 49 receives the pulse width modulation signal, generates a transistor drive signal for driving each of the six transistors Tr11 to Tr16, and outputs the generated signal to the second bridge circuit 14.

As a result, the stator coils C _GU ,
Each phase current generated in C _GV and C _GW is converted into a DC current and supplied to the battery 16. The power supply circuit 30 applies a drive voltage to the gate drive circuit 49 and applies a control power supply voltage to the generator control circuit 47. By the way, in a hybrid vehicle,
For example, when starting, the hybrid vehicle is driven by using the generator 12 for driving, driving the motor 11 and the generator 12 at the same time, and adding the motor driving force of the motor 11 and the generator driving force of the generator 12. I try to run.

However, each of the first and second bridge circuits 1
Since the common smoothing capacitor 15 is connected to the transistors 3 and 14, the transistors Tr1 to Tr6 and the transistor Tr1
When the transistors 1 to 16 are turned on or off at the same time, a large ripple current flows through the smoothing capacitor 15 and the life of the smoothing capacitor 15 is shortened. Therefore, the transistors Tr1 to Tr6 and the transistor Tr
11 to Tr16 are not turned on or off at the same time.

FIG. 1 is a main part circuit diagram of a control device of an inverter device according to a first embodiment of the present invention, and FIG. 4 is a diagram showing an example of a pulse width modulation signal according to the first embodiment of the present invention. is there. In the figure, 27 is a motor control circuit, 28
Is a vehicle control circuit, and 47 is a generator control circuit.

The vehicle control circuit 28 includes torque command value generating means 51, timing generating means 52, triangular wave generating means 50 as first carrier signal generating means, and inverting means 60 as second carrier signal generating means. The torque command value generating means 51 generates torque command values T _M and _TG for driving the motor 11 (FIG. 2) and the generator 12 based on an accelerator signal, a brake signal, and a shift signal. Output to the control circuit 27 and the generator control circuit 47. Also,
The timing generator 52 generates a timing signal and outputs it to the triangular wave generator 50. The triangular wave generating means 50 generates a reference triangular wave as a first carrier signal based on the timing signal. The reference triangular wave is output to the first pulse width modulation signal generating means 55 and the inverting means 60 of the motor control circuit 27, and after being inverted by the inverting means 60, is converted into an inverted triangular wave as a second carrier signal. The inverted triangular wave is generated by the second pulse width modulation signal generation means 65 of the generator control circuit 47.
Is output to

The motor control circuit 27 has a current command value generating means 53, a current comparing means 54, a first pulse width modulation signal generating means 55 and the like. The current command value generating means 53 generates a three-phase sine wave signal consisting of a U-phase, a V-phase and a W-phase based on the torque command value T _M in accordance with the position of the rotor. Wave signal is current command value i
_MU , i _MV , and i _MW are output to the current comparing means 54.

The current comparing means 54 calculates the current command value i
_MU , i _MV , i _MW and the phase currents I _MU , I _MW fed back from the motor 11 are compared, and the deviations ΔI _MU , ΔI _MV , ΔI _MW as the first current command signals are converted to the first pulse width modulation. Output to the signal generating means 55. In this case, the current command value generating means 53 and the current comparing means 54 constitute a first current command signal generating means. Since only two phase currents I _MU and I _MW are actually fed back from the motor 11, only the deviations ΔI _MU and ΔI _MW are obtained, and the deviation ΔI _MV becomes the deviations ΔI _MU and ΔI _MW . It is calculated based on:

Then, the first pulse width modulation signal generating means 55 outputs the inputted deviations ΔI _MU , ΔI _MV , ΔI _MU
By comparing _MW with the reference triangular wave from the triangular wave generating means 50, three-phase first pulse width modulation signals P _MU and P _MV having output pulse widths corresponding to the current command values i _MU , i _MV and i _MW. ,
P _MW, and generates the first pulse width modulated signal P _MU ,
P _MV and P _MW are output to the gate drive circuit 29 (FIG. 3).

The gate drive circuit 29 generates a transistor drive signal corresponding to the first pulse width modulation signal P _MU , P _MV , P _MW , and outputs the transistor drive signal to the first bridge circuit 13. Output to On the other hand, the generator control circuit 47 has a current command value generating means 63, a current comparing means 64, a second pulse width modulation signal generating means 65 and the like. The current command value generating means 63 generates a three-phase sine wave signal consisting of a U-phase, a V-phase, and a W-phase based on the torque command value _TG in accordance with the position of the rotor. The wave signal is output to the current comparing means 64 as the current command values i _GU , i _GV , i _GW .

The current comparing means 64 calculates the current command value i
_GU , i _GV , i _GW are compared with the phase currents I _GU , I _GW fed back from the generator 12, and the deviations ΔI _GU , ΔI _GV , ΔI _GW as the second current command signals are converted to the second pulse width modulation. Output to the signal generating means 65. in this case,
The current command value generating means 63 and the current comparing means 64 constitute a second current command signal generating means. In addition,
Since only two phase currents I _GU and I _GW are actually fed back from the generator 12, the deviation ΔI
_GU , ΔI _GW only, and the deviation ΔI _GV is the deviation ΔI _GU ,
It is calculated based on ΔI _GW .

Then, the second pulse width modulation signal generating means 65 outputs the inputted deviations ΔI _GU , ΔI _GV , ΔI _G
By comparing the _GW with the inverted triangular wave from the inverting means 60, three-phase second pulse width modulation signals P _GU , P _GV , having output pulse widths corresponding to the current command values i _GU , i _GV , i _GW P _GW is generated, and the second pulse width modulation signals P _GU , P _GV , P _GW are output to the gate drive circuit 49.

The gate drive circuit 49 generates a transistor drive signal corresponding to the second pulse width modulation signals P _GU , P _GV , P _GW , and outputs the transistor drive signal to the second bridge circuit 14. Output to Incidentally, since the inverted triangular wave is generated by inverting the reference triangular wave, the timing is shifted by π with respect to the reference triangular wave. In the first pulse width modulation signal generating means 55, the deviations ΔI _MU , ΔI _MV ,
ΔI _MW is compared with the reference triangular wave, and in the second pulse width modulation signal generating means 65, deviations ΔI _GU , ΔI _GV ,
Since ΔI _GW is compared with the inverted triangular wave, the second pulse width modulation signals P _GU , P _GV , P _GW are turned on with respect to the first pulse width modulation signals P _MU , P _MV , P _MW . The off timing is generated by being shifted by π (in FIG. 4, only the first and second pulse width modulation signals P _MU and P _GU are shown).

Therefore, the first pulse width modulation signals P _MU , P _MV , P _MW and the second pulse width modulation signals P _GU ,
Since P _GV and P _GW do not simultaneously rise from low level to high level or fall from high level to low level, the transistors Tr1 to Tr
6 and the transistors Tr11 to Tr16 are not turned on or off at the same time.

As a result, the ripple current which tends to flow to the smoothing capacitor 15 as the first bridge circuit 13 is driven and the ripple current which flows to the smoothing capacitor 15 as the second bridge circuit 14 is driven. And a large amount of the ripple current, the smoothing capacitor 1
5 has a smaller ripple current. Therefore, the life of the smoothing capacitor 15 can be extended.

Further, even if a common smoothing capacitor 15 is used for the first bridge circuit 13 and the second bridge circuit 14, the capacity of the smoothing capacitor 15 does not need to be increased. Can be In the present embodiment, the triangular wave generating means 50
The reversing means 60 is provided in the vehicle control circuit 28, but may be provided in the motor control circuit 27 or in the generator control circuit 47. Further, the triangular wave generating means 50 and the inverting means 60 can be provided independently of the motor control circuit 27, the vehicle control circuit 28, and the generator control circuit 47.

Next, a second embodiment of the present invention will be described. In addition, about what has the same structure as 1st Embodiment, the description is abbreviate | omitted by attaching the same code | symbol. FIG. 5 is a main part circuit diagram of the control device of the inverter device according to the second embodiment of the present invention, and FIG. 6 is a diagram showing an example of a pulse width modulation signal according to the second embodiment of the present invention.

In this case, the vehicle control circuit 28 includes a torque command value generating means 51 and a synchronizing signal generating means 71. The synchronizing signal generating means 71 generates a synchronizing signal. The first pulse width modulation signal generation means 72 and the second pulse width modulation signal generation means 73 of the generator control circuit 47 are output. Then, the first pulse width modulation signal generating means 72 outputs the input first
Based on the deviations ΔI _MU , ΔI _MV , and ΔI _MW as the current command signals of the three phases, the three-phase pulse having an output pulse width corresponding to the current command value i _MU , i _MV , i _MW in synchronization with the synchronization signal. 1 of the pulse width modulation signal P _MU, P _MV, to generate P _MW, the first pulse width modulated signal P _MU, P _MV, and outputs the same to the base drive circuit (not shown) to P _MW.

Similarly, the second pulse width modulation signal generating means 73 outputs the deviation Δ as the input second current command signal.
The three-phase second pulse width modulation signal P having an output pulse width corresponding to the current command value i _GU , i _GV , i _GW in synchronization with the synchronization signal based on I _GU , ΔI _GV , ΔI _{GW. GU} , P
_GV , P _GW , and the second pulse width modulated signal P _GU ,
_PGV and _PGW are output to a base drive circuit (not shown).

Incidentally, the first pulse width modulation signal P
_MU , P _MV , P _MW and the second pulse width modulation signals P _GU , P _GV ,
The P _GW, the timing of the on-off is displaced.
That is, the first pulse width modulation signals P _MU , P _MV , P
_MW is the timing ti (i = 1, 2,
..) Are generated so as to rise from a low level to a high level, and the second pulse width modulation signals P _GU ,
P _GV and P _GW are generated so as to fall from a high level to a low level at each timing ti of the synchronization signal (in FIG. 6, only the first and second pulse width modulation signals P _MU and P _GU are generated). Is shown).

Therefore, the first pulse width modulation signals P _MU , P _MV , P _MW and the second pulse width modulation signals P _GU ,
Since P _GV and P _GW do not simultaneously rise from low level to high level or fall from high level to low level, the transistors Tr1 to Tr
6 and the transistors Tr11 to Tr16 are not turned on or off at the same time.

In this embodiment, the synchronizing signal generating means 71 is provided in the vehicle control circuit 28, but may be provided in the motor control circuit 27 or in the generator control circuit 47. You can also. Further, the synchronizing signal generating means 71 is provided by the motor control circuit 27 and the vehicle control circuit 2.
8 and the generator control circuit 47 can be provided independently.

Further, in the present embodiment, the first pulse width modulation signals P _MU , P _MV , and P _MW are generated so as to rise from a low level to a high level at each timing ti of the synchronization signal. , The second pulse width modulation signals P _GU , P _GV , and P _GW are generated so as to fall from a high level to a low level at each timing ti of the synchronization signal. _MU , P _MV , and P _MW are determined by the timing ti of the synchronization signal.
At the second pulse width modulation signal P _GU , P _GV , P
_{The GW} may be generated so as to rise from a low level to a high level at each timing ti of the synchronization signal.

The present invention is not limited to the above embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[0049]

As described above in detail, according to the present invention, in an inverter device, a motor inverter, a generator inverter, and a common smoothing capacitor connected to the motor inverter and the generator inverter. First current command signal generating means for generating a first current command signal for driving the motor;
First pulse width modulation signal generating means for generating a first pulse width modulation signal based on the first current command signal;
Second current command signal generating means for generating a second current command signal for driving the generator, and a second pulse width for generating a second pulse width modulation signal based on the second current command signal Modulation signal generating means.

The first and second pulse width modulation signal generating means generates first and second pulse width modulation signals by displacing the on / off timing. in this case,
A first current command signal for driving the motor is generated, and a first pulse width modulation signal is generated based on the first current command signal. Further, a second current command signal for driving the generator is generated, and the second current command signal is generated.
, A second pulse width modulation signal is generated based on the current command signal.

The first and second pulse width modulation signals are generated by displacing the on / off timing. Therefore, the first pulse width modulation signal and the second pulse width modulation signal do not simultaneously rise from a low level to a high level or fall from a high level to a low level. And the transistor of the generator inverter are not simultaneously turned on or off.

As a result, the ripple current flowing through the smoothing capacitor is reduced, so that the life of the smoothing capacitor can be extended. Further, even if a common smoothing capacitor is used for the bridge circuit for the motor inverter and the bridge circuit for the generator inverter, it is not necessary to increase the capacity of the smoothing capacitor, so that the inverter device can be downsized accordingly. .

[Brief description of the drawings]

FIG. 1 is a main part circuit diagram of a control device of an inverter device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of a main part of the inverter device according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a control device of the inverter device according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating an example of a pulse width modulation signal according to the first embodiment of the present invention.

FIG. 5 is a main part circuit diagram of a control device of an inverter device according to a second embodiment of the present invention.

FIG. 6 is a diagram illustrating an example of a pulse width modulation signal according to the second embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 11 motor 12 generator 50 triangular wave generating means 53, 63 current command value generating means 54, 64 current comparing means 55, 72 first pulse width modulation signal generating means 60 inverting means 65, 73 second pulse width modulation signal generating means 71 Synchronization signal generating means P _MU , P _MV , P _MW First pulse width modulation signal P _GU , P _GV , P _GW Second pulse width modulation signal ti Timing ΔI _MU , ΔI _MV , ΔI _MW , ΔI _GU , ΔI _GV , ΔI _GW
deviation

Continuing from the front page (72) Inventor Kimiya Maki 10 Takane, Fujii-machi, Anjo-shi, Aichi F-term (reference) in Aisin AW Co., Ltd. 5H007 AA06 BB06 CA01 CB05 CC05 DA05 DB03 DC02 EA13 FA04 5H576 AA15 BB03 BB06 BB10 CC04 DD02 DD07 EE11 GG04 HA02 HB02 HB05 JJ29 LL22 LL41 LL58

Claims (4)

[Claims] 1. A motor inverter, a generator inverter, and a common smoothing capacitor connected to the motor inverter and the generator inverter.
First current command signal generating means for generating a first current command signal for driving a motor, and a first pulse width for generating a first pulse width modulation signal based on the first current command signal Modulation signal generating means, second current command signal generating means for generating a second current command signal for driving the generator, and generating a second pulse width modulation signal based on the second current command signal And second pulse width modulation signal generating means for causing the first and second pulse width modulation signals to be generated.
Wherein the pulse width modulation signal generating means generates first and second pulse width modulation signals by shifting on / off timing. 2. A first carrier signal generating means for generating a first carrier signal, and a second carrier signal generating means for generating a second carrier signal by displacing a timing with the first carrier signal. And the first pulse width modulation signal generating means generates a first pulse width modulation signal by comparing the first current command signal with a first carrier signal, and generates the second pulse width modulation signal. 2. The inverter device according to claim 1, wherein the modulation signal generation means generates a second pulse width modulation signal by comparing the second current command signal with a second carrier signal. 3. A synchronizing signal generating means for generating a synchronizing signal, wherein one of the first and second pulse width modulation signal generating means has a first and a second pulse width modulation signal at the timing of the synchronizing signal.
2. The second pulse width modulation signal rises, and the other of the first and second pulse width modulation signal generating means falls the first and second pulse width modulation signals at the timing of the synchronization signal. 3. The inverter device according to claim 1. 4. A method for controlling an inverter device comprising a motor inverter, a generator inverter, and a common smoothing capacitor connected to the motor inverter and the generator inverter, wherein the first current for driving the motor is provided. Generating a command signal, generating a first pulse width modulation signal based on the first current command signal, generating a second current command signal for driving a generator, and generating the second current command signal. A second pulse width modulation signal is generated on the basis of the first and second pulse width modulation signals, and the first and second pulse width modulation signals are generated by displacing the ON / OFF timing.