JP6021980B1 - Elevator control device - Google Patents

Abstract

An abnormal state of a semiconductor switching element mounted on a power converter in a battery device having a power charging / assist function is detected and a protective operation is immediately performed. An elevator control device according to an embodiment includes a voltage detection unit, a voltage prediction unit, an abnormality determination unit, and a protection operation unit. The voltage prediction unit 42 predicts the power assist amount or the power charge amount of the battery device 20 based on the operation pattern of the car 4, predicts the current pattern that flows to the IGBT 22a from the predicted power, and determines the current pattern from the predicted current pattern. The Vce voltage value of the IGBT 22a is predicted. The voltage detector 41 detects the Vce voltage value of the IGBT 22 a when the car 4 is in operation. The abnormality determination unit 43 compares the predicted value of Vce and the detected value to determine the abnormal state of the IGBT 22a. The protection operation unit 44 performs the protection operation of the IGBT 22a based on the determination result of the abnormality determination unit 43. [Selection] Figure 1

Description

  The present invention relates to a hybrid drive type elevator control device including a battery device capable of charging / assisting electric power.

  Generally, in an elevator, a car and a counterweight are suspended from both ends of a rope wound around a rotating shaft of a hoisting machine, and the car hangs in a direction opposite to the counterweight via the rope by the rotation of the hoisting machine. It moves up and down.

  Here, for example, when the car moves downward in the hoistway, if the load of the car at that time is heavier than the counterweight, the hoisting machine functions as a generator to generate electric power. Similarly, when the car moves upward, electric power is generated even if the load on the car at that time is lighter than the counterweight. Such power is called “regenerative power”, and the operation at that time is called “regenerative operation”. Conversely, an operation that requires electric power is called “power running operation”.

  In recent years, a hybrid elevator equipped with a battery device (power supply device) that can charge a battery with electric power generated during such regenerative operation and assist the battery power in a driving system during powering operation or power failure is considered. It has been.

  The battery device incorporates a power converter such as a DC / DC converter, and a semiconductor switching element represented by an IGBT (Insulated Gate Bipolar Transistor) is used as the power converter. In recent years, this type of semiconductor switching element has a low short-circuit tolerance due to downsizing, and the time from when a short-circuit current begins to flow to the element until destruction is very short. Accordingly, when an abnormality such as a short circuit occurs for some reason, it is necessary to immediately activate the protective operation.

Japanese Unexamined Patent Publication No. 7-7962 JP 2006-82933 A

  If an abnormality such as a short circuit occurs in the semiconductor switching element for some reason during the operation of the elevator (car), the above-described power charging / assist function of the battery device does not work and the driving operation is hindered.

  The problem to be solved by the present invention is an elevator that can detect an abnormal state of a semiconductor switching element mounted on a power converter in a battery device having a power charging / assist function and can immediately perform a protective operation. It is to provide a control device.

  A control device for an elevator according to an embodiment controls a drive of a battery device that charges a battery with electric power generated during regenerative operation of a car and assists the drive system with the electric power of the battery during powering operation or power failure. The elevator control device includes voltage predicting means, voltage detecting means, abnormality determining means, and protective operation means.

  The voltage predicting means predicts a power assist amount or a power charge amount of the battery device based on an operation pattern of the car, and semiconductor switching mounted on a power converter in the battery device from the predicted power. A current pattern flowing through the element is predicted, and a voltage value between the collector and the emitter of the semiconductor switching element is predicted from the predicted current pattern. The voltage detecting means detects a voltage value between a collector and an emitter of the semiconductor switching element during operation of the car. The abnormality determination unit compares the voltage value predicted by the voltage prediction unit with the voltage value detected by the voltage detection unit to determine an abnormal state of the semiconductor switching element. The protection operation unit performs the protection operation of the semiconductor switching element based on the determination result of the abnormality determination unit.

FIG. 1 is a diagram illustrating a configuration of a control apparatus for a hybrid drive type elevator according to the first embodiment. FIG. 2 is a diagram showing a state where the IGBT is short-circuited. FIG. 3 is a graph showing characteristics of the collector-emitter voltage Vce and the gate-emitter voltage Vge with respect to an increase in the IGBT collector current Ic. FIG. 4 is a diagram showing a change portion of the collector-emitter voltage Vce due to the IGBT collector current Ic. FIG. 5 is a diagram illustrating a configuration of a control device for a hybrid drive type elevator according to the second embodiment. FIG. 6 is a diagram showing a schematic configuration of the IGBT. FIG. 7 is a diagram showing a state in which the solder joint between the ceramic substrate and the copper base has become brittle due to the aging use of the IGBT. FIG. 8 is a diagram showing characteristics of the collector current Ic and the collector-emitter voltage Vce with respect to the temperature rise of the IGBT. FIG. 9 is a diagram showing characteristics of the collector current Ic and the collector-emitter voltage Vce with respect to an increase in the IGBT gate-emitter voltage Vge. FIG. 10 is a diagram illustrating a configuration of a control device for a hybrid drive type elevator according to the third embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram showing a configuration of a hybrid drive type elevator according to the first embodiment.

  The elevator includes a drive device 10, a battery device 20, and an elevator control device 30. The drive device 10 includes a converter 11, a smoothing capacitor 12, and an inverter device 13, and supplies power necessary for driving the hoisting machine 2 in accordance with a drive instruction from the elevator control device 30.

  Note that the converter 11 converts an AC voltage supplied from the commercial power source 1 into a DC voltage. The commercial power source 1 is a three-phase AC power source. The smoothing capacitor 12 smoothes the ripple of the DC voltage converted by the converter 11. The inverter device 13 converts the DC voltage supplied from the converter 11 through the smoothing capacitor 12 into an AC voltage having an arbitrary frequency and voltage value by PWM (Pulse Width Modulation) control, and uses this as drive power to the hoist 2 To supply.

  The hoisting machine 2 is composed of a synchronous motor, and rotates by power supply from the driving device 10. A rope 3 is wound around the hoisting machine 2 through a sheave (not shown), and a rope 4 is connected to one end of the rope 3 and a counterweight 5 is connected to the other end. Thereby, with the rotation of the hoist 2, the car 4 and the counterweight 5 are lifted and lowered via the rope 3.

  The inverter device 13 provided in the drive system of the elevator incorporates at least one set of IGBT (semiconductor switching element) 13a and a diode (rectifier element) 13b connected in reverse parallel to the IGBT 13a as circuit elements. .

  The battery device 20 is also called a “power supply device” and has a power charging / assist function. The battery device 20 includes an AC / DC converter 21, a DC / DC converter 22, a DC / DC converter 23, and a battery 24, and obtains the power from the commercial power source 1 and the power generated during the regenerative operation from the drive device 10. Are stored in the battery 24, and the power of the battery 24 is supplied to the driving device 10 during the power running operation. Further, the battery device 20 has a configuration capable of supplying required power to the elevator control device 30.

  The AC / DC converter 21 is connected to the primary side of the control power transformer 31 provided on the elevator control device 30 on the AC side and to the DC bus of the battery device 20 on the DC side. The AC / DC converter 21 has a conversion function from AC (alternating current) to DC (direct current) and a conversion function from DC (direct current) to AC (alternating current).

  In the present embodiment, required power is supplied from the battery device 20 to the elevator control device 30 during normal operation. At that time, the electric power (direct current) of the battery device 20 is converted into an alternating current having a different voltage by the AC / DC converter 21 and applied to the primary side of the control power transformer 31 of the elevator control device 30.

  The DC / DC converter 22 is provided in the front stage of the battery 24 and has a function of converting DC (direct current) into DC (direct current) having a different voltage. In the present embodiment, the electric power generated during the regenerative operation is obtained from the drive device 10 and stored in the battery 24. At that time, the DC / DC converter 22 converts the voltage into the standard voltage of the battery 24 and stores it in the battery 24. Further, when the power of the battery 24 is supplied to the drive device 10 during the power running operation, it is converted into a predetermined voltage and supplied to the drive device 10.

  The DC / DC converter 23 is provided between the emergency power supply device 32 and the DC bus of the battery device 20 and has a function of converting DC (DC current) to DC (DC current) having a different voltage. The DC / DC converter 23 is used when the regenerative power obtained by the driving device 10 or the power of the battery 24 is used as an emergency power source for the elevator control device 30.

  The elevator control device 30 is also referred to as a “control panel” and is a part that controls the entire elevator. The elevator control device 30 is provided with a control power transformer 31, an emergency power device 32, a control power device 33, an illumination power device 34, and a control microcomputer 35.

  The control power transformer 31 has a configuration capable of inputting two different voltages on the primary side. The commercial power supply 1 is connected to one primary side of the control power transformer 31 and the AC / DC converter 21 of the battery device 20 is connected to the other primary side, and these electric powers are transformed to the secondary side. The power is supplied to the connected control power supply 33 and illumination power supply 34.

  For example, the voltage value V2 of power supplied from the battery device 20 may be set lower than the voltage value V1 of power supplied from the commercial power supply 1 (V2 <V1). This is in consideration of a voltage drop between the driving device 10 and the battery device 20.

  The emergency power supply device 32 is a device that supplies required power to equipment used in an emergency such as an emergency light or an intercom, and includes a power supply circuit and the like. The control power supply device 33 is a device that supplies required power to the control microcomputer 35, and includes a power supply circuit and the like. The illumination power supply device 34 is a device that supplies required power to the lighting / air conditioning equipment in the car 4, and includes a power supply circuit and the like.

  Among these, the control power supply device 33 and the illumination power supply device 34 operate by receiving the power transformed by the control power supply transformer 31, and the emergency power supply device 32 from the battery device 20 through the DC / DC converter 23. Operates with direct power.

  The battery 24 has a large capacity and high performance charge / discharge function. As this battery 24, for example, a lithium ion battery is used.

  The control microcomputer 35 is an elevator operation control computer. The control microcomputer 35 performs overall control related to the operation of the elevator, such as drive control of the drive device 10 and charge / discharge control of the battery device 20.

  Also, SW1 to SW4 in the figure are switches for power supply / cutoff switching.

  SW <b> 1 is provided in a three-phase power supply line connected between the commercial power supply 1 and a control power transformer 31 on the power input side of the elevator control device 30. When the SW1 is ON, power is supplied from the commercial power supply 1 to the elevator control device 30.

  SW2 is provided in a three-phase power supply line connected between the commercial power source 1 and the converter 11 on the power input side of the drive device 10. When the SW 2 is ON, power is supplied from the commercial power source 1 to the driving device 10.

  SW <b> 3 is provided in two power supply lines connected between the DC buses of the driving device 10 and between the DC buses of the battery device 20. When the SW 3 is ON, power is supplied from the drive device 10 to the battery device 20, and power is supplied from the battery device 20 to the drive device 10.

  SW4 is provided in a three-phase power supply line connected to an AC / DC converter 21 on the power output side of the battery device 20 and a control power transformer 31 on the power input side of the elevator control device 30. When the SW 4 is ON, power is supplied from the battery device 20 to the elevator control device 30, and power is supplied to the battery device 20 through the elevator control device 30.

  In such a configuration, the battery device 20 is connected to the drive device 10 and the elevator control device 30 so as to exchange power with each other. Therefore, the regenerative power and commercial power supply power obtained by the drive device 10 during normal operation are stored in the battery device 20, and the stored power is not only supplied to the drive device 10 during power running operation but also supplied to the elevator control device 30. Can be used for elevator operation. Furthermore, even when the power supply to the drive device 10 is interrupted during parking, the power of the commercial power source 1 can be supplied to the battery device 20 via the elevator control device 30 to charge the battery 24.

  That is, during normal operation, SW1 is OFF and SW2-4 are ON. As a result, the drive device 10 can operate by receiving power from the battery device 20 in addition to the power supplied from the commercial power source 1, and the battery device 20 can be charged with the power obtained during the regenerative operation. can do.

  On the other hand, the elevator control device 30 also operates by receiving electric power supplied from the battery device 20. In this case, the power supplied from the battery device 20 to the elevator control device 30 includes regenerative power obtained by the drive device 10.

  Thus, the elevator can be operated by effectively utilizing the battery device 20 during normal operation. Further, even when a power failure or a phase failure abnormality of the commercial power source 1 occurs, the operation of the elevator can be continued using the electric power stored in the battery 24. At that time, since the battery device 20 is connected to the elevator control device 30, a switching circuit from the commercial power source 1 to the battery device 20 is unnecessary, and the car 4 is temporarily stopped at the nearest floor using the battery power. Then, the operation can be continued at a low speed or a rated speed for a predetermined time.

  In addition, for example, at night, when the normal operation ends, the operation of the elevator is stopped. This is called “parking”.

  During parking, SW1 is ON, SW2-3 are OFF, and SW4 is ON. Thereby, the battery 24 can be charged from the commercial power source 1 via the control power transformer 31 of the elevator control device 30. Therefore, normal operation can be started after sufficient electric power is stored in the battery 24 during parking. For example, when the drive device 10 fails, it is possible to supply power from the battery device 20 to the emergency power supply device 32.

  Here, in addition to the power supply control using the battery device 20 as described above, the elevator control device 30 includes a semiconductor switching element (21, 22, 23) used in the power converter (21, 22, 23) of the battery device 20. A function for detecting an abnormal state of (IGBT) is provided.

  Below, the structure which performs abnormality detection of IGBT22a mounted in this DC / DC converter 22 is demonstrated taking the DC / DC converter 22 of the battery apparatus 20 as an example.

  The elevator control device 30 includes a voltage detection unit 41, a voltage prediction unit 42, an abnormality determination unit 43, and a protection operation unit 44 as an abnormality detection function of the semiconductor switching element. In the example of FIG. 1, the voltage detection unit 41, the voltage prediction unit 42, the abnormality determination unit 43, and the protection operation unit 44 that realize the abnormality detection function are provided separately from the control microcomputer 35. It may be provided in

  The voltage detector 41 detects the collector-emitter voltage Vce of the IGBT 22a to be monitored during operation of the car 4.

  The voltage prediction unit 42 predicts the power assist amount or the power charge amount of the battery device 20 based on the operation pattern of the car 4, predicts the current pattern that flows to the IGBT 22a from the predicted power, and determines the predicted current pattern. The collector-emitter voltage Vce of the IGBT 22a is predicted. The driving pattern includes the driving direction of the car 4, the loaded load, and the destination floor. That is, regenerative power (charging power) obtained from the inverter device 13 based on the driving direction, loading load and destination floor obtained as the driving pattern of the car 4 before driving or assist power (discharge power) supplied to the inverter device 13 And the current and voltage flowing through the IGBT 22a are predicted from the predicted power.

  The abnormality determination unit 43 compares the collector-emitter voltage Vce predicted by the voltage prediction unit 42 with the collector-emitter voltage Vce detected by the voltage detection unit 41 to determine the abnormal state of the IGBT 22a. In this case, if the difference between the two voltage values is equal to or greater than a preset value, it is determined that the IGBT 22a is in a short-circuited state.

  The protection operation unit 44 performs the protection operation of the IGBT 22a based on the determination result of the abnormality determination unit 43. Specifically, when the abnormality determining unit 43 determines that the IGBT 22a is short-circuited, the protection operation unit 44 immediately stops the car 4 at the nearest floor and drives the battery device 20. Stop.

  Next, a method for detecting the short-circuit state of the IGBT 22a will be described.

  As shown in FIG. 2, when the IGBT 22a is short-circuited, a large collector current Ic (high di / dt) flows as a short-circuit current. At this time, a phenomenon occurs in which the gate-emitter voltage Vge rises through the stray capacitance of the element. As shown in FIGS. 3 and 4, the collector-emitter voltage Vce at the time of energization also changes as the collector current Ic increases.

  Here, it is possible to predict the regenerative power (charging power) or assist power (discharging power) from the driving direction, loading load and destination floor of the car 4, and predict the pattern of the energization current to the IGBT 22a from the predicted power. The voltage change of Vce can be predicted from the energization current. When a short circuit occurs in the IGBT 22a due to some trouble, a large collector current Ic flows through the IGBT 22a as described above, and the voltage value of Vce also changes. Therefore, if the change is detected, it can be detected that the IGBT 22a is short-circuited.

  Therefore, in the voltage prediction unit 42 shown in FIG. 1, before driving the car 4, the regenerative power (charging power) or the assist power (discharging power) is calculated from the driving pattern (driving direction, loading load and destination floor) at that time. The current pattern flowing through the IGBT 22a is predicted from the predicted power, and the collector-emitter voltage Vce of the IGBT 22a is predicted from the current pattern and supplied to the abnormality determination unit 43. As a prediction method, for example, there is a method in which a relational expression between a current and a voltage flowing in the IGBT 22a is prepared in advance for each operation pattern of the car 4, and prediction is performed according to the relational expression.

  On the other hand, when the car 4 is operated, the voltage detection unit 41 detects the collector-emitter voltage Vce of the IGBT 22 a and applies it to the abnormality determination unit 43. The abnormality determination unit 43 compares the predicted value of Vce given from the voltage prediction unit 42 with the detection value of Vce given from the voltage detection unit 41.

  In this case, if the IGBT 22a is in a normal state, the predicted value and the detected value are the same value or approximate values. If the IGBT 22a is in an abnormal state, the predicted value and the detected value are different. Therefore, the abnormality determining unit 43 obtains a difference between the predicted value and the detected value, and determines that the IGBT 22a is in an abnormal state, that is, a short-circuited state, if the difference is equal to or greater than a preset value.

  When the abnormality determination unit 43 determines that the IGBT 22a is in a short circuit state, the protection operation unit 44 immediately stops the car 4 at the nearest floor and stops driving the battery device 20. Thereby, the drive of the battery device 20 can be stopped before the IGBT 22a is damaged, and the operation of the car 4 can be stopped to ensure the safety of passengers.

  Thus, by predicting the voltage value of Vce from the driving pattern of the car 4, and comparing the predicted voltage value with the voltage value detected during driving, the abnormal state of the IGBT 22a can be detected and short-circuited. If it is, the protection operation can be immediately performed.

(Second Embodiment)
Next, a second embodiment will be described.

  In the second embodiment, in addition to the configuration of the first embodiment, a function of correcting the predicted value of Vce according to the deterioration state of the IGBT 22a to be monitored is provided.

  FIG. 5 is a diagram illustrating a configuration of an elevator control device according to the second embodiment. In addition, the same code | symbol is attached | subjected to the same part as the structure of FIG. 1 in the said 1st Embodiment, and the description shall be abbreviate | omitted.

In the configuration of FIG. 5, the difference from FIG. 1 is that the elevator control device 21 is provided with a correction unit 45. The correction unit 45 determines the deterioration state of the IGBT 22a to be monitored, and corrects the voltage value of Vce predicted by the voltage prediction unit 42 according to the deterioration state.

FIG. 6 is a schematic configuration diagram of the IGBT 22a .

  The IGBT chip 51 made of silicon is connected to a main electrode formed on the ceramic substrate 53 via a bonding wire 52. The ceramic substrate 53 is joined to the copper base 55 for heat dissipation with solder 54. A heat radiator 56 is provided under the copper base 55, and heat generated in the IGBT chip 51 is released to the heat radiator 56 through the copper base 55, which is a heat radiating plate, as indicated by arrows.

  Here, when the IGBT 22 a repeatedly generates heat / pauses due to the operation of the elevator and the temperature fluctuation occurs in the copper base 55, stress is applied to the solder 54 at the joint due to the difference in thermal expansion coefficient between the ceramic substrate 53 and the copper base 55. There is a problem that embrittlement (crack) occurs.

The state at this time is shown in FIG. With the aging of the IGBT 22a, if the embrittlement of the solder 54 that joins the ceramic substrate 53 and the copper base 55 becomes severe, the heat dissipation performance is significantly reduced, the junction temperature is increased, and the IGBT chip 51 is heated. fall into disrepair. In particular, when the elevator is used repeatedly for rapid acceleration / stop, the thermal stress applied to the IGBT 22a becomes large, and the above phenomenon appears remarkably.

  If the current applied to the IGBT 22a is constant, the collector-emitter voltage Vce varies depending on the temperature Tj of the IGBT chip 51 as shown in FIG. That is, as the temperature Tj increases, the voltage value of Vce increases.

  Therefore, the deterioration state is determined by driving the battery device 20 under a predetermined condition during maintenance check or by remote operation from a monitoring center (not shown) and comparing the voltage change of the IGBT 22a with the initial value.

  The “predetermined condition” is, for example, when the car 4 is parked, SW1 is turned on, SW2-3 is turned off, SW4 is turned on, and the commercial power supply 1 is connected to the battery device 20 to be in a charging state. It is to be. If the commercial power source 1 is connected to the battery device 20 and the battery is charged while the car 4 is parked, a constant collector current Ic flows through the IGBT 22a. Therefore, if the collector-emitter voltage Vce at that time is measured, the degree of deterioration can be found by comparison with the initial value.

The correction unit 45 shown in FIG. 5 determines the degradation state of the IGBT 22a from the voltage value of Vce detected when the IGBT 22a is energized under a certain condition as described above, and the voltage prediction unit 42 according to the degradation state. The voltage value of Vce predicted by is corrected. In this case, the voltage characteristic of Vce is corrected so as to increase the voltage value as the deterioration of the IGBT 22a progresses. The abnormality determination unit 43 compares the predicted value of Vce obtained from the corrected voltage characteristics with the detected value of Vce during operation to determine abnormality of the IGBT 22a .

(Modification)
In the second embodiment, the deterioration state of the IGBT 22a is determined from the voltage value of Vce detected when the IGBT 22a is energized under a certain condition. However, the deterioration state is also determined by measuring the voltage value of Vge. Is possible.

  The characteristic diagram shown in FIG. 8 is data of Vge = 15V. Even at the temperature of the same IGBT element, the value of the collector-emitter voltage Vce varies depending on the value of Vge as shown in FIG. In this example, the characteristics of Vce when Vge = 20V, 15V, 12V, 10V, and 8V are changed are shown.

  Since the gate circuit of the IGBT element is mounted with an article that deteriorates characteristics such as an aluminum electrolytic capacitor, the collector-emitter voltage Vge may change over time. Therefore, if Vge when the IGBT 22a is energized is measured and compared with the initial value, the deterioration state of the IGBT 22a can be determined from the variation.

The correction unit 45 shown in FIG. 5 determines the degradation state of the IGBT 22a from the voltage value of Vce detected when the IGBT 22a is energized under a certain condition as described above, and the voltage prediction unit 42 according to the degradation state. The voltage value of Vce predicted by is corrected. In this case, the voltage characteristic of Vce is corrected so as to increase the voltage value as the deterioration of the IGBT 22a progresses. The abnormality determination unit 43 compares the predicted value of Vce obtained from the corrected voltage characteristics with the detected value of Vce during operation to determine abnormality of the IGBT 22a .

  In this way, by correcting the voltage value predicted by the voltage prediction unit 42 according to the deterioration state of the IGBT 22a to be monitored, the abnormal state of the IGBT 22a can be determined more accurately, and immediately when short-circuited It is possible to shift to the protection operation.

(Third embodiment)
Next, a third embodiment will be described.

  In the third embodiment, in addition to the configuration of the first embodiment, a function for correcting the predicted value of Vce in consideration of the temperature condition of the IGBT 22a to be monitored is provided.

  FIG. 10 is a diagram illustrating a configuration of an elevator control device according to the third embodiment. In addition, the same code | symbol is attached | subjected to the same part as the structure of FIG. 1 in the said 1st Embodiment, and the description shall be abbreviate | omitted.

  In the configuration of FIG. 10, the difference from FIG. 1 is that the elevator control device 21 is provided with a temperature detection unit 46 and a correction unit 47. The temperature detection unit 46 detects the temperature around the IGBT 22a to be monitored. The periphery of the IGBT 22a includes the periphery of the battery device 20 on which the IGBT 22a is mounted. The correction unit 47 predicts the junction temperature increase state of the IGBT 22a from the temperature detected by the temperature detection unit 46, and corrects the voltage value of Vce predicted by the voltage prediction unit 42 according to the junction temperature increase state.

  That is, the temperature around the battery device 20 on which the IGBT 22a is mounted is not always constant, and varies depending on the operating rate of the elevator and the season. In particular, the temperature difference is noticeable between summer and winter. Since the junction temperature of the IGBT 22a used in the battery device 20 is also affected by the ambient temperature, it is considered that the voltage characteristic of Vce fluctuates.

  Therefore, a temperature sensor (not shown) is installed in the vicinity of the battery device 20, and the temperature measured by the temperature sensor is detected by the temperature detection unit 46. The correction unit 47 corrects the voltage value of Vce predicted by the voltage prediction unit 42 in consideration of the temperature detected by the temperature detection unit 46.

For example, it is assumed that the ambient temperature of the IGBT 22a is 5 degrees higher than the temperature measured at the initial stage. In such a case, the voltage characteristic of Vce is corrected so as to increase the voltage value by 5 degrees of the temperature difference. As a result, the abnormality determination unit 43 determines the abnormality of the IGBT 22a by comparing the predicted value of Vce obtained from the corrected voltage characteristics with the detected value of Vce during operation.

(Modification)
In the third embodiment, the Vce voltage characteristic is corrected in consideration of the ambient temperature of the IGBT 22a. However, the Vce voltage characteristic may be corrected in consideration of the internal temperature of the IGBT 22a.

  That is, the time constant of cooling differs between summer and winter, and a difference occurs in the temperature change of the IGBT chip during energization. For example, when heat is accumulated due to the energization from the front, the internal temperature becomes high.

  Therefore, the internal temperature of the IGBT 22a is measured by a temperature sensor (not shown), and the temperature is detected by the temperature detection unit 46. The correction unit 47 corrects the voltage value of Vce predicted by the voltage prediction unit 42 in consideration of the temperature detected by the temperature detection unit 46.

For example, it is assumed that the internal temperature of the IGBT 22a is 5 degrees higher than the temperature measured at the initial stage. In such a case, the voltage characteristic of Vce is corrected so as to increase the voltage value by 5 degrees of the temperature difference. As a result, the abnormality determination unit 43 determines the abnormality of the IGBT 22a by comparing the predicted value of Vce obtained from the corrected voltage characteristics with the detected value of Vce during operation.

  In this way, by correcting the predicted value of Vce in consideration of the temperature condition of the IGBT 22a to be monitored, the abnormal state of the IGBT 22a can be determined more accurately. can do.

  In each of the above-described embodiments, the case where the abnormal state of the IGBT 22a mounted on the DC / DC converter 22 in the battery device 20 is detected has been described. However, other power converters incorporated in the battery device 20 ( The same applies to the AC / DC converter 21 and the DC / DC converter 23).

  According to at least one embodiment described above, it is possible to detect an abnormal state of a semiconductor switching element mounted on a power converter in a battery device having a power charging / assist function and to immediately perform a protective operation. An elevator control device can be provided.

  In addition, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Commercial power supply, 2 ... Hoisting machine, 3 ... Rope, 4 ... Car, 5 ... Counter weight, 10 ... Drive apparatus, 11 ... Converter, 12 ... Smoothing capacitor, 13 ... Inverter, 13a ... IGBT, 20 ... Battery Equipment: 21 ... AC / DC converter, 22 ... DC / DC converter, 22a ... IGBT, 23 ... DC / DC converter, 24 ... Battery, 30 ... Elevator control device, 31 ... Control power transformer, 32 ... Emergency Power supply device 33 ... Control power supply device 34 ... Lighting power supply device 35 ... Control microcomputer 30 ... Elevator control device 41 ... Voltage detection unit 42 ... Voltage prediction unit 43 ... Abnormality judgment unit 44 ... Protection operation unit 45 ... corrector, 46 ... temperature detector, 47 ... corrector, 51 ... IGBT chip, 52 ... bonding wire, 53 ... ceramic substrate, 54 ... solder, 55 ... copper base, 6 ... radiator.

Claims (7)

In an elevator control device that controls the driving of a battery device that charges the battery with electric power generated during regenerative operation of the car and assists the drive system with the electric power of the battery during powering operation or power failure,
A power assist amount or a power charge amount of the battery device is predicted based on an operation pattern of the car, and a current pattern flowing from the predicted power to a semiconductor switching element mounted on a power converter in the battery device is determined. Voltage predicting means for predicting and predicting a voltage value between the collector and emitter of the semiconductor switching element from the predicted current pattern;
Voltage detecting means for detecting a voltage value between a collector and an emitter of the semiconductor switching element during operation of the car;
An abnormality determination unit that compares the voltage value predicted by the voltage prediction unit with the voltage value detected by the voltage detection unit to determine an abnormal state of the semiconductor switching element;
An elevator control apparatus comprising: a protection operation unit that performs a protection operation of the semiconductor switching element based on a determination result of the abnormality determination unit. The abnormality determination means is
Determining that the semiconductor switching element is in a short-circuited state when the difference between the voltage value predicted by the voltage predicting means and the voltage value detected by the voltage detecting means is greater than or equal to a preset value. The elevator control device according to claim 1, wherein: A deterioration state of the semiconductor switching element is determined from a comparison between a voltage value between the collector and the emitter when the semiconductor switching element is energized under a certain condition and a preset initial value, and the voltage is determined according to the deterioration state. 2. The elevator control apparatus according to claim 1, further comprising correction means for correcting a voltage value predicted by the prediction means.
  A deterioration state of the semiconductor switching element is determined from a comparison between a gate-emitter voltage value when the semiconductor switching element is energized under a certain condition and a preset initial value, and the voltage is determined according to the deterioration state. 2. The elevator control apparatus according to claim 1, further comprising correction means for correcting a voltage value predicted by the prediction means. Temperature detecting means for detecting the ambient temperature of the semiconductor switching element;
The semiconductor device further includes a correcting unit that predicts a rising state of the junction temperature of the semiconductor switching element from the temperature detected by the temperature detecting unit and corrects a voltage value predicted by the voltage predicting unit according to the rising state of the junction temperature. The elevator control device according to claim 1. Temperature detecting means for detecting a temperature change inside the semiconductor switching element;
2. The elevator control apparatus according to claim 1, further comprising a correcting unit that corrects a voltage value predicted by the voltage predicting unit in accordance with a temperature change detected by the temperature detecting unit.   The elevator control device according to claim 1, wherein the semiconductor switching element is an IGBT.

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