JP2010098919A - Power semiconductor module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power conversion device having a dynamic braking function, which improves shut-down performance of an AC generator and achieves miniaturization and cost reduction. <P>SOLUTION: A switching element for dynamic braking is provided inside a power semiconductor module. By turning the switching element on, each phase terminal of an AC generator is short-circuited via the switching element, a braking current is passed to the AC generator, and the AC generator is shut down immediately. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power semiconductor module, and relates to a power semiconductor module having a dynamic brake function and controlling an AC motor.

  Power converters that are generally known as inverters and that electrically convert DC power into AC power are widely used as AC motor speed control devices in industry and home appliances.

  When the AC motor is decelerated and stopped, rotational energy during deceleration of the motor is accumulated as electrostatic energy in a smoothing capacitor in a DC intermediate circuit inside the power semiconductor module provided in the power converter. However, the capacitance is small, and the voltage across the smoothing capacitor rises due to the electrostatic energy that cannot be accommodated. Then, the overvoltage detection protection circuit provided in the DC intermediate circuit operates, and the power conversion device stops. If the power converter is stopped by the operation of the overvoltage detection protection circuit, the AC motor becomes uncontrollable.

  For this reason, a regenerative braking circuit is mounted on the DC intermediate circuit in the power converter, and the rotational energy during deceleration of the AC motor is consumed as heat energy by the regenerative braking resistor. This regenerative braking circuit is used when the rotation of the AC motor is decelerated and stopped during normal operation.

  The heat generated by the regenerative braking resistor is transmitted to the board in the power converter and raises the temperature of peripheral components. In addition, power semiconductors such as IGBTs used in power conversion devices generate heat due to loss of electricity generated during power conversion. In such an environment, when the semiconductor element is used while exceeding the operation limit temperature of the semiconductor element and still generating heat, the semiconductor element may be destroyed due to thermal destruction. For this reason, a cooling fin and a cooling fan for cooling the power semiconductor are provided, heat from the power semiconductor, which is a heating element, is conducted to the cooling fin, and air is sent to the cooling fin by the cooling fan to exchange heat and dissipate heat. Let

In addition to the regenerative braking circuit, it is necessary to provide a dynamic brake circuit so that the AC motor can be stopped immediately in case of an emergency. This is because even if the AC motor is put into the deceleration mode by the regenerative braking circuit, the AC motor cannot be stopped instantaneously. Generally, in order to provide a power converter with a dynamic brake function for emergency stop, it has a power semiconductor module having a forward converter and a reverse converter, and an auxiliary module having a dynamic brake circuit and the like. For example, Patent Documents 1 to 3 describe a power conversion device or the like in which an accessory module as a dynamic brake is individually provided.
JP-A-6-178567 JP 2000-270577 JP-A-6-46505

  However, Patent Documents 1 to 3 separately provide ancillary modules such as circuit breakers and thyristor modules for dynamic brakes, separately from power semiconductor modules equipped with forward converters and reverse converters inside power converters. Therefore, there is a problem that consideration is not given to an increase in the installation area and cost of the entire power conversion device due to the addition of the incidental module. There are also problems with the complexity of wiring connected from module to module, the generation of noise, the convenience of handling, and the like.

  This invention is made | formed in view of such a condition, and is providing the power converter device provided with the dynamic brake function which aimed at size reduction and cost reduction.

  Specific embodiments of the present invention for solving the above object are as follows.

  In the present invention, a dynamic brake switching element is provided inside the power semiconductor module instead of separately installing an auxiliary module for dynamic brake in the power converter. By turning on the switching element, each phase terminal of the AC motor is short-circuited by the switching element. Then, the current generated from one phase terminal of the AC motor is fed back to the other phase terminal to become a braking current, and the AC motor is suddenly stopped.

  That is, the power semiconductor module of the present invention is a power semiconductor module in which an electronic component is mounted on an insulating substrate inside a casing and controls a three-phase AC motor provided outside the casing, and the power semiconductor module on the insulating substrate A plurality of sets of switching elements having a pair of upper and lower elements connected in series with each other, a diode element connected in antiparallel to the switching elements, and any two of the three-phase AC motors And a switching element for dynamic brake provided in the.

  Alternatively, the power semiconductor module of the present invention is a power semiconductor module in which an electronic component is mounted on an insulating substrate inside a housing and controls a three-phase AC motor provided outside the housing, the power semiconductor module on the insulating substrate Any one of a plurality of switching elements each having a pair of upper and lower elements connected in series with each other, diode elements connected in antiparallel to each of the switching elements, and the three-phase AC motor A dynamic brake switching element provided between one phase and a source terminal of the lower side element.

  Alternatively, the power semiconductor module of the present invention is a power semiconductor module in which an electronic component is mounted on an insulating substrate inside a housing and controls a three-phase AC motor provided outside the housing, the power semiconductor module on the insulating substrate A plurality of sets of switching elements each having a pair of upper and lower elements connected in series with each other, a diode element connected in antiparallel to each of the switching elements, a source terminal of the lower element and a reference A resistance element provided between the electric potential and a switching element for dynamic brake provided between any one phase of the three-phase AC motor and the reference potential.

  Alternatively, the power semiconductor module of the present invention is a power semiconductor module in which an electronic component is mounted on an insulating substrate inside a housing and controls a three-phase AC motor provided outside the housing, the power semiconductor module on the insulating substrate A plurality of sets of switching elements having a pair of upper and lower elements connected in series with each other, a diode element connected in antiparallel to the switching elements, and any two of the three-phase AC motors Two dynamic brake switching elements connected in parallel to each other.

  Alternatively, the power semiconductor module of the present invention is a power semiconductor module in which an electronic component is mounted on an insulating substrate inside a housing and controls a three-phase AC motor provided outside the housing, the power semiconductor module on the insulating substrate A plurality of sets of switching elements having a pair of upper and lower elements connected in series with each other, a diode element connected in antiparallel to the switching elements, and any one of the three-phase AC motors And two dynamic brake switching elements respectively connected between the remaining two phases.

Alternatively, the power semiconductor module of the present invention is the power semiconductor module according to any one of claims 1 to 5, further comprising a plurality of sets of rectifiers each having a pair of upper and lower elements connected in series. A diode element, a thyristor element, a regenerative braking switching element, and a reflux diode element connected to the regenerative braking switching element,
Is provided.

  In the above case, each of the elements may be a chip element, or the dynamic brake switching element may be an IGBT element.

  Alternatively, the dynamic brake switching element may be a dynamic brake thyristor element, or the dynamic brake switching element may have reverse blocking capability.

  ADVANTAGE OF THE INVENTION According to this invention, size reduction and cost reduction of a power converter device are attained, improving the stop performance of an electric motor.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, this embodiment is only an example for realizing the present invention, and does not limit the technical scope of the present invention. In each drawing, the same reference numerals are assigned to common components.

<Configuration of power converter>
First, the example of the power converter device using the power semiconductor module by this invention is demonstrated.

  FIG. 1 is a schematic diagram of a circuit configuration of a power converter 11 that controls the AC motor 4 in the present embodiment.

  The power converter 11 includes a power semiconductor module 10 including a power semiconductor chip, a smoothing capacitor 2, a regenerative braking resistor 19, a start-up resistor 20, a control circuit 5, a cooling fan 6, a digital operation panel 7, and a driver circuit 8.

  The power semiconductor module 10 includes an R / S / T terminal to which a three-phase AC power source as a power source of the entire control device is connected, a forward converter 1, an inverse converter 3, a regenerative braking circuit 9, a thyristor 16, a shunt resistor 17 ,including. Moreover, although IGBT is mounted as a typical switching element, this element is not limited to IGBT, What is necessary is just to have a form as switching elements, such as a thyristor, for example.

  Further, the type of the operation panel 7 of the present embodiment is not particularly limited, but the digital operation panel is configured so that the operation can be performed while viewing the display on the display unit in consideration of the operability of the apparatus user. Is good.

  Note that the display unit is not necessarily configured integrally with the operation panel 7, but it is desirable that the display unit be configured integrally so that an operator of the operation panel 7 can operate while viewing the display.

  Various control data of the power converter input from the operation panel 7 is stored in a storage unit (not shown).

<Operation of power converter>
The forward converter 1 rectifies the alternating voltage into direct current. The smoothing capacitor 2 smoothes the pulsating component of the rectified DC voltage. The inverse converter 3 outputs the smoothed DC voltage as an AC voltage whose frequency can be adjusted. The AC motor 4 is controlled by the output AC voltage. The driver circuit 7 controls the AC frequency of the inverse converter 3.

  The control circuit 5 is equipped with a microcomputer (control arithmetic unit), and controls the switching elements of the inverse converter 3 according to various control data input from the digital operation panel 7, and also controls necessary for the entire apparatus. Process. Also, the digital operation panel 7 displays an abnormality.

  The cooling fan 6 cools the power semiconductor module 10 in order to prevent element destruction due to heat generation.

  The operation panel 7 can set and change various control data of the power conversion device. The operation panel 7 is provided with a display unit capable of displaying an abnormality, and when an abnormality is detected in the power conversion device, the display is displayed on the display unit.

  The driver circuit 8 drives each switching element including an inverse converter based on a command from the control circuit 5. In addition, a switching regulator circuit (DC / DC converter) is mounted in the driver circuit 8, and each DC voltage necessary for the operation of the power converter is generated and supplied to each component.

  In combination with the regenerative braking resistor 19, the regenerative braking circuit 9 converts the regenerative energy generated when the AC motor 4 is decelerated into heat and consumes it.

<Parts layout of power converter>
FIG. 2 is a layout diagram of main circuit components of the power conversion device. The power conversion device of the present invention includes a power semiconductor module 10, a cooling fin 12, and a cooling fan 6 configured as a composite module in which the forward converter 1, the reverse converter 3, and the regenerative braking circuit 9 are mounted in one module. The main circuit board 14 including the smoothing capacitor 2 and the resin mold case 13 The heat from the power semiconductor module 10 which is a heating element is conducted to the cooling fins 12, and air is sent to the cooling fins 6 by the cooling fan 6. It has an arrangement structure in which heat is exchanged to dissipate heat.

  A power detector (not shown) is mounted in the power semiconductor module 10 configured as a composite module, and detects the temperature inside the power module. This temperature detector is composed of a thermistor whose resistance value varies with temperature.

  In particular, it should be noted that the dynamic brake circuit module is not included in each component housed in the resin mold case 13.

<Normal AC motor stop operation>
When the AC motor 4 driven by the power converter 11 decelerates, the rotational energy is converted into electric power due to the inertia of the AC motor, which is a rotating body, and is fed back to the smoothing capacitor 2 inside the power converter, as electrostatic energy. Stored. However, since the capacitance of the smoothing capacitor is relatively small, surplus energy that cannot be accommodated increases the voltage V _PN across the smoothing capacitor.

For this reason, the power conversion device is provided with a regenerative braking circuit for consuming surplus energy generated when the AC motor decelerates as heat by the regenerative braking resistor 19, so that an overvoltage is not applied to the voltage V _PN across the smoothing capacitor. It is like that.

However, in the unlikely event that an overvoltage is applied to the smoothing capacitor 2, an overvoltage protection function is provided to protect the smoothing capacitor. This overvoltage protection function detects the voltage V _PN and shuts off the output of the power converter when the detected voltage value is _{equal to} or higher than the specified voltage V _PND0 . When this overvoltage protection function operates, the power converter stops and the AC motor becomes uncontrollable.

<Operation to stop AC motor in emergency>
In the method of causing the regenerative braking resistor 19 to consume the rotational energy as heat, the AC motor can be decelerated but cannot be stopped suddenly. This is because the AC motor 4 that maintains rotational energy by inertia generates electric power as a generator, and a regenerative braking resistor having a predetermined resistance value consumes the electric power to gradually reduce the rotation.

  Therefore, in order to stop the AC motor suddenly, each phase terminal of the AC motor is short-circuited, and the speed electromotive force inside the AC motor is eliminated in a short time. Hereinafter, the stop operation of the AC motor in an emergency will be described with reference to the drawings.

  FIG. 3 is a diagram showing a route of current flowing through the switching elements of the respective phases constituting the inverter 3 during normal PWM control. In this example, the upper arm switching element UP, the lower arm switching element VN, and the switching element WN are turned on.

The attenuation characteristic of the speed electromotive force (residual voltage) of the AC motor is such that, for example, when the commercial power supply is shut off from the state where the AC motor 4 is driven by the commercial power supply, the motor 4 rotates at the speed that was rotating when the power supply was shut off. Proportional speed electromotive force E is generated.
The speed electromotive force E (residual voltage) has a different attenuation behavior depending on the connected load characteristics.

  The residual voltage E is expressed by the following equation.

ここで、Edoは電源遮断時の残留初期電圧値、τは交流電動機の回路時定数(L/R)、ωrは交流電動機の回転子角速度、tは時間、である。

Here, Edo is the residual initial voltage value when the power is shut off, τ is the circuit time constant (L / R) of the AC motor, ωr is the rotor angular velocity of the AC motor, and t is time.

  The residual voltage E has a characteristic of decaying according to the rotational angular frequency ωr of the AC motor and the circuit time constant τ of the AC motor. The attenuation behavior of the AC motor residual voltage after the power supply is cut off is the same as when the commercial power supply is driven even when driven by the power converter.

  In order to rapidly attenuate the residual voltage E and stop the AC motor rapidly, a switching element is provided inside the power semiconductor module 10, and each phase terminal of the AC motor is short-circuited by the switching element. Then, the rotational energy is consumed as heat by the internal impedance of the AC motor. The reason why the internal impedance of this AC motor is used is that it is tens to thousands of times smaller than the value of the regenerative braking resistance, so that heat generation is larger than the regenerative braking resistance and energy is consumed instantly. is there.

  More specifically, as shown in the following equation, the speed electromotive force Eu (U phase) is connected to the winding resistance Ru (U phase) and reactance Xu (U phase) of the AC motor in the U phase of the AC motor 4. The current Iu (U phase) divided by the impedance flows.

このように交流電動機4の入力端子をスイッチング素子15で短絡することにより、制動電流が流れ、交流電動機を急停止させることができる。

Thus, by short-circuiting the input terminal of the AC motor 4 with the switching element 15, a braking current flows and the AC motor can be stopped suddenly.

  FIG. 4 shows a current route flowing through the switching element and the AC motor 4 when the dynamic brake function is operated. When receiving the braking start command signal DBS from the host for the purpose of suddenly stopping the AC motor, the driver circuit 8 once turns off all the elements UP, VP, WP, UN, VN, WN constituting the inverter 3, and then By turning on the dynamic brake switching element 15 provided inside the power semiconductor module 10, each phase terminal of the AC motor is short-circuited by the switching element 15, and a braking current is supplied to the AC motor.

  Here, the diode in the dynamic brake switching element 15 is a block diode for preventing a reverse voltage from being applied to the IGBT.

<First embodiment>
FIG. 5 is a diagram showing a configuration of the power semiconductor module 10 equipped with the dynamic brake switching element according to the first embodiment of the present invention. A dynamic brake switching element 15 is provided between the terminal U and the terminal W. By turning on the switching element 15, the terminals U and W of the AC motor 4 are short-circuited. That is, the speed electromotive force Eu (U phase) and Ew (W phase) of each phase generated in the AC motor 4 are short-circuited, and rotational energy is consumed as heat by the internal impedance of the AC motor.

  By doing in this way, the power converter device provided with a dynamic brake function is built, without providing the module carrying a dynamic brake circuit separately. That is, since the dynamic brake function and the power conversion function can be accommodated in one power semiconductor module, there is no need for an individual casing, a board on which components are mounted, wiring for connecting the modules, and the like. In particular, when a substrate is provided individually, it is necessary to secure a wide wiring layer for the reference potential of the substrate, which requires a large area. Therefore, if the configuration of this embodiment is adopted, the apparatus can be reduced in size.

  Therefore, it is possible to reduce the size and cost of the power conversion device while improving the stopping performance of the electric motor.

  Here, since the six switching elements included in the inverse converter are turned off while the dynamic brake switching element 15 is turned on, the switching elements used in the normal time and the emergency stop are different. The motor capacity that can be driven by the power conversion device is determined in advance, and the rated capacity display of the power conversion device describes the specification voltage, the output current, the maximum motor capacity that can be driven, and the like. Since the winding resistance value of the AC motor 4 can be known from the description, the maximum value of the braking current may be obtained from the winding resistance value of the motor 4 and the rated current of the switching element 15 may be selected.

  Therefore, the rated current of the dynamic brake switching element 15 can be selected regardless of the rated currents of the six switching elements constituting the inverter 3. In addition, if the dynamic brake switching element 15 selected as described above is designed, the dynamic brake switching element 15 is destroyed by an overcurrent during dynamic braking even if a braking current is passed through the winding resistance. There is no risk of doing so. In this case, the rated current of the switching element 15 for dynamic brake is completely different from the rated current of the six switching elements constituting the inverse converter 3, so that the degree of design freedom in selecting the switching element 15 for dynamic brake is increased. be able to.

  In FIG. 5, for the sake of simplicity of the circuit diagram, the gate wirings of the switching elements included in the inverter 3 are collectively shown, but the gate wirings of the six switching elements are independent. The same applies to FIGS. 6 to 10 referred to below.

<Second Embodiment>
FIG. 6 is a diagram showing a configuration of a power semiconductor module 10 equipped with a dynamic brake switching element according to the second embodiment of the present invention. Here, the dynamic brake switching element 18 is different from FIG. 5 in that an IGBT having reverse blocking capability is used.

  By doing so, the block diode in the dynamic brake switching element 15 shown in FIG. 5 becomes unnecessary. In general, the size and number of components occupy an important position due to circumstances such as downsizing of devices and space limitations. It is advantageous in terms of handling, cost, space, etc. that the number of component parts is as small as one.

  Therefore, in this embodiment, in addition to the effects of the first embodiment, it is possible to further reduce the size and cost of the power conversion device.

  The effect of the invention is the same even when the switching element 18 for dynamic brake of the present embodiment can be connected to each terminal between U-V, V-W, and U-W of the AC motor.

<Third embodiment>
FIG. 7 is a diagram showing a configuration of a power semiconductor module 10 equipped with a dynamic brake switching element according to a third embodiment of the present invention. Here, the dynamic brake switching element 15 is provided between the SH1 terminal and the U terminal. At the time of emergency stop, the switching element 15 is turned on so that the braking current returns to the AC motor 4 through a diode connected in antiparallel to the switching element of the lower arm connected to the V terminal or the W terminal. In this configuration, the terminals U and V and the terminals U and W of the AC motor 4 are short-circuited. That is, the speed electromotive force Eu (U phase), Ev (V phase), Ew (W phase) of each phase generated in the AC motor 4 is short-circuited.

  By doing so, the source potential of the dynamic brake switching element 15 becomes the same potential as the reference of the three switching elements constituting the lower arm of the inverter 3. That is, the gate potential for turning on the dynamic brake switching element 15 may be equal to the three switching element gate potentials constituting the lower arm of the inverter 3.

  Therefore, the power source input to the gate of the dynamic brake switching element 15 and the power source input to the three switching element gates constituting the lower arm of the inverter 3 can be shared. There is no need to provide a special power source. This configuration is advantageous in terms of malfunction of the drive circuit due to external noise because a single power supply is used and the power supply wiring is not routed.

  In addition, even when the U phase has a negative potential, there is a diode connected in reverse parallel to the switching element of the lower arm connected to the V terminal or the W terminal, so that the U phase from the V phase or the W phase Current does not flow back into the phase.

  Therefore, the dynamic brake switching element 15 does not need to have reverse blocking capability, and the same standard element as the switching element used in the reverse converter 3 can be used.

  This embodiment is very useful because the above-described effects can be obtained in addition to the effects described in the first and second embodiments.

<Fourth embodiment>
FIG. 8 is a diagram showing a configuration of a power semiconductor module 10 equipped with a dynamic brake switching element according to the fourth embodiment of the present invention. Here, the dynamic brake switching element 15 is provided between the N terminal and the U terminal, which have the same potential as the reference of the forward converter 1. Compared with the third embodiment described above, the installation location of the shunt resistor 17 for current detection is different.

  In the case of the third embodiment, the braking current does not flow through the current detecting shunt resistor 17, but in this embodiment, the braking current flows through the current detecting shunt resistor 17. However, when a large current such as a braking current is passed through the shunt resistor 17, it is necessary to consider the problem of heat generation, so the internal impedance of the AC motor that influences the braking current value and the connection of external resistance (Fig. 9) Depending on the presence or absence, etc., it is better to use them differently from the third embodiment.

  By doing so, the braking current flows through the shunt resistor 17 for current detection, and a potential difference is generated between the N terminal and the SH1 terminal depending on the current value and the resistance value of the shunt resistor 17.

  Therefore, in addition to the effects obtained in the third embodiment, the present embodiment monitors the potential difference, so that even if an AC motor 4 that is larger than the rated capacity display of the power conversion device is mistakenly connected, the dynamic brake Therefore, the switching element 15 can be cut off accurately, and the switching element 15 can be protected from destruction due to overcurrent. Further, when an abnormality in the braking current is detected, it is possible to display the abnormality in the braking current on the digital operation panel 7 described in FIG.

  As the rated capacity of the AC motor 4 increases, the winding resistance value decreases and the braking current increases. In view of applications such as parallel driving of the AC motor 4, this embodiment, which can detect a braking current and display an abnormality of the braking current, is an effective method capable of verifying a system construction error in advance when the equipment is started up.

<Fifth embodiment>
FIG. 9 is a diagram showing a configuration of a power semiconductor module 10 equipped with a dynamic brake switching element according to the fifth embodiment of the present invention. Here, as the dynamic brake switching element 18, two IGBTs having reverse blocking capability are provided. In addition, when the winding resistance of the AC motor is small, terminals DB1 and DB2 for connecting the braking resistor R in series are provided for the purpose of suppressing the braking current. The braking current in this case is

となるので、外部に設けた制動抵抗Rによりスイッチング素子18に流れる電流は制限される。

Therefore, the current flowing through the switching element 18 is limited by the braking resistor R provided outside.

  By doing so, braking electricity flows bidirectionally from the U terminal to the W terminal and from the W terminal to the U terminal. In the first to fourth embodiments, since the dynamic brake switching element 15 has only one IGBT having reverse blocking capability, the current generated from the AC motor can only flow in one direction. A sufficient current could not be fed back to 4. However, in the present embodiment, the dynamic brake switching element 18 is fed back to the AC motor 4 through one of two IGBTs having reverse blocking capability regardless of whether the AC current is positive or negative.

  Therefore, the braking force at the time of emergency stop can be further increased. In addition, since the braking current can be suppressed even when the internal resistance Ru of the AC motor 4 is small, the rating of the dynamic brake switching element (that is, the size of the element) can be freely selected, and the safety aspect is also improved. It is possible to obtain a power conversion device that is considered and has increased durability.

  In FIG. 9, two NPNs are used for the dynamic brake switching element, but one or both of them can be PNPs.

  Further, it goes without saying that the same effect can be obtained even if the braking resistance connection terminals DB1 and DB2 are applied to the first to fourth embodiments described above or the sixth embodiment described below. In addition, it goes without saying that the same effect can be obtained even if the dynamic brake switching element 18 of the present embodiment is configured to be connected to each terminal between U-V, V-W, and U-W of the AC motor.

<Sixth embodiment>
FIG. 10 is a diagram showing a configuration of a power semiconductor module 10 equipped with a dynamic brake switching element according to a sixth embodiment of the present invention. Here, two IGBTs having reverse blocking capability are provided inside the dynamic brake switching element 18. In this embodiment, the number of IGBTs having the reverse blocking ability as the dynamic brake switching element 15 in the first to fourth embodiments is one, which is two.

  By doing so, a braking current flows between U-V and U-W of the AC motor. Since the internal impedance of the AC motor serving as the load at the return destination is connected in parallel, the braking current flowing from the U terminal is increased by half.

  Therefore, the braking time at the time of emergency stop can be further shortened.

<Others>
In the above embodiment, the case where the braking start command signal DBS is received from the host for the purpose of suddenly stopping the AC motor has been described, but the braking start frequency and the braking time can be set in advance by the operation panel 7, Needless to say, similar effects can be obtained.

  Further, it is desirable to use a chip element for each component, which further promotes downsizing of the apparatus.

<Summary>
According to the present invention, the dynamic brake switching element is provided inside the power semiconductor module, each phase of the AC motor is short-circuited by the switching element, the braking current is supplied to the AC motor, and the AC motor is suddenly stopped. Thereby, without adding the individual module for dynamic brakes to the power conversion device, it is possible to improve the stopping performance of the motor, and to reduce the size and cost of the device.

Outline diagram of main circuit configuration of power converter Main circuit component layout of power converter Current route diagram during normal PWM control Braking current route diagram flowing in the simple equivalent circuit of an AC motor Power conversion device equipped with dynamic brake switching element of the present invention Power conversion device equipped with dynamic brake switching element of the present invention Power conversion device equipped with dynamic brake switching element of the present invention Power conversion device equipped with dynamic brake switching element of the present invention Power conversion device equipped with dynamic brake switching element of the present invention Power conversion device equipped with dynamic brake switching element of the present invention

Explanation of symbols

1 ... Forward converter, 2 ... Smoothing capacitor, 3 ... Reverse converter, 4 ... AC motor, 5 ... Control circuit, 6 ... Cooling fan, 7 ... Digital operation panel, 8 ... Driver circuit, 9 ... Regenerative braking circuit, 10 ... Power semiconductor module, 11 ... Power converter, 12 ... Cooling fin, 13 ... Resin mold case, 14 ... Main circuit board, 15 ... Dynamic brake switching element, 16 ... Thyristor, 17 ... Shunt resistor, 18 ... Reverse blocking Switching element for dynamic brake composed of IGBT, 19 ... Regenerative braking resistor, 20 ... Start-up resistor, R, S, T ... Power converter input power supply terminal, U, V, W ... Power converter output terminal, Iu , Iw: Current of each phase of AC motor, Ru: U phase winding resistance of AC motor, Xu: U phase reactance of AC motor, Eu: U phase speed electromotive force of AC motor, GT, G1, G2, G21, G22 , G3, G4, G5 ... Gate signal terminals of each element, BR ... Regenerative braking resistor, DBS ... Dynamic start command signal, DB1, DB2 ... braking resistor connection terminal for dynamic brake

Claims (10)

An electronic component is mounted on an insulating substrate inside the housing, and is a power semiconductor module that controls a three-phase AC motor provided outside the housing,
On the insulating substrate,
A plurality of switching elements each having a pair of upper and lower elements connected in series with each other;
A diode element connected in antiparallel to the switching element;
A dynamic brake switching element provided between any two phases of the three-phase AC motor;
A power semiconductor module comprising: An electronic component is mounted on an insulating substrate inside the housing, and is a power semiconductor module that controls a three-phase AC motor provided outside the housing,
On the insulating substrate,
A plurality of switching elements each having a pair of upper and lower elements connected in series with each other;
A diode element connected in antiparallel to each of the switching elements;
A switching element for dynamic brake provided between any one phase of the three-phase AC motor and a source terminal of the lower stage side element;
A power semiconductor module comprising: An electronic component is mounted on an insulating substrate inside the housing, and is a power semiconductor module that controls a three-phase AC motor provided outside the housing,
On the insulating substrate,
A plurality of switching elements each having a pair of upper and lower elements connected in series with each other;
A diode element connected in antiparallel to each of the switching elements;
A resistance element provided between a source terminal of the lower side element and a reference potential;
A switching element for a dynamic brake provided between any one phase of the three-phase AC motor and the reference potential;
A power semiconductor module comprising: An electronic component is mounted on an insulating substrate inside the housing, and is a power semiconductor module that controls a three-phase AC motor provided outside the housing,
On the insulating substrate,
A plurality of switching elements each having a pair of upper and lower elements connected in series with each other;
A diode element connected in antiparallel to the switching element;
Two dynamic brake switching elements connected in parallel between any two phases of the three-phase AC motor,
A power semiconductor module comprising: An electronic component is mounted on an insulating substrate inside the housing, and is a power semiconductor module that controls a three-phase AC motor provided outside the housing,
On the insulating substrate,
A plurality of switching elements each having a pair of upper and lower elements connected in series with each other;
A diode element connected in antiparallel to the switching element;
Two dynamic brake switching elements respectively connected between any one of the three-phase AC motors and the remaining two phases;
A power semiconductor module comprising: In the power semiconductor module according to any one of claims 1 to 5,
A plurality of sets of rectifying diode elements each having a pair of upper and lower elements connected in series with each other;
A thyristor element;
A switching element for regenerative braking;
A reflux diode element connected to the regenerative braking switching element;
A power semiconductor module comprising: In the power semiconductor module according to any one of claims 1 to 6,
Each of the elements is a chip element. In the power semiconductor module according to any one of claims 1 to 7,
The power semiconductor module, wherein the dynamic brake switching element is an IGBT element. In the power semiconductor module according to any one of claims 1 to 7,
The power semiconductor module, wherein the dynamic brake switching element is a dynamic brake thyristor element. In the power semiconductor module according to any one of claims 1 to 8,
The power semiconductor module, wherein the dynamic brake switching element has reverse blocking capability.

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