JP2007001668A - Elevator control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow exerting the performance intended originally by suppressing a drop of the charge/discharge characteristic of an electricity accumulating device even in the environment where the ambient temperature lowers, for example in a cold place. <P>SOLUTION: When the regenerative electric power is consumed by a regenerative resistance 6, the thermal energy 11 generated at this time of power consumption rises toward an opening 10a to increase the temperature of the air in a casing 10. Accordingly the ambient temperature of the electricity accumulating device 9 rises to enable the electricity accumulating device 9 to obtain a good charge/discharge characteristic even at the time of serving in a cold place. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an elevator control device including a power storage device that stores regenerative power.

  The elevator changes its balance state with the car and the counterweight depending on the direction of car movement and the number of passengers in the car, and is in an operation mode of either power running or regenerative operation. In the power running operation, the electric motor consumes electric power to drive the car, whereas in the regenerative operation, the car drives the generator, and thus extra regenerative power is generated. This regenerative power is normally returned to the power supply side and effectively used. However, when the regenerative power cannot be returned to the power supply side due to the state of the power supply side, it is passed through a regenerative resistor and consumed as heat. Is stored in the power storage device.

  FIG. 3 is a block diagram showing a conventional elevator control apparatus similar to that of Patent Document 1. As shown in FIG. In this figure, a converter 2 is connected to an AC power source 1 such as a commercial power source, and an inverter 3 is connected to the converter 2 via lines P and N. An AC motor 4 is connected to the inverter 3.

  Between the lines P and N, a smoothing capacitor 5, a series connection body of a regenerative resistor 6 and a closing switch 7, and a step-up / step-down chopper circuit 8 are connected, and a power storage device 9 (for example, A secondary battery such as a nickel-hydrogen battery or an electric double layer capacitor is used).

  The step-up / step-down chopper circuit 8 is interposed between the switching elements 81 and 82, the diodes 83 and 84 connected in antiparallel thereto, and the connection point between the positive terminal of the power storage device 9 and the switching elements 81 and 82. Reactor 85.

  Next, the operation of FIG. 3 will be described. In the case of power running operation, the three-phase AC power from the AC power source 1 is converted into DC power by the converter 2, smoothed by the smoothing capacitor 5, and then input to the inverter 3. The inverter 3 supplies the AC motor 4 with three-phase AC power obtained by controlling the input DC power with variable voltage and variable frequency control.

  On the other hand, in the regenerative operation, the AC motor 4 functions as a generator, and DC power is output from the inverter 3 between the lines P and N. This direct-current power tends to be regenerated to the AC power supply 1 side via the converter 2, but may not be regenerated depending on the state of the AC power supply 1 side. In that case, an elevator control circuit (not shown) turns on the input switch 7 and consumes regenerative power with the regenerative resistor 6, or charges the power storage device 9 by controlling the charge of the buck-boost chopper circuit 8. Like that.

  The regenerative power charged and accumulated in the power storage device 9 is input to the inverter 3 via the smoothing capacitor 5 by the discharge control of the step-up / step-down chopper circuit 8 during the subsequent powering operation. Therefore, energy saving can be achieved, and when a commercial power source is used as the AC power source 1, it can contribute to a reduction in power charges.

The charge / discharge control of the step-up / step-down chopper circuit 8 is performed as follows. That is, in the case of charge control, switching element 81 is turned on and switching element 82 is turned off, so that the current from inverter 3 flows into power storage device 9 via switching element 81 and reactor 85, and switching element 81 is turned off. Then, the diode 83 functions as a freewheeling diode. On the other hand, in the case of discharge control, since the switching element 81 is turned off and the switching element 82 is turned on, the power storage device 9 starts discharging along the path of the reactor 85 and the switching element 82, and the connection point of the switching elements 81 and 82 is determined. When the potential becomes a certain level or higher, electric power is supplied to the inverter 3 via the diode 83.
Japanese Patent Laid-Open No. 2001-240322

  As described above, according to a conventional elevator control device using a power storage device, regenerative power can be used effectively and energy saving should be possible. However, the degree of achievement of this energy saving greatly depends on the performance of the power storage device. A factor that greatly affects the performance of the power storage device is the ambient temperature of the power storage device.

  That is, if the ambient temperature of the power storage device is too low, good charge / discharge characteristics cannot be obtained, and the amount of charge and the amount of discharge are insufficient, so that sufficient energy saving cannot be achieved. Conversely, if the ambient temperature of the power storage device is too high, the charge / discharge characteristics are improved, but the life is adversely affected. As a result, sufficient energy saving cannot be achieved. In particular, in a cold region, the ambient temperature of the power storage device is considerably lowered and the charge / discharge characteristics thereof are remarkably deteriorated. Therefore, it has been difficult for the conventional elevator control device to exhibit the original performance of the power storage device.

  The present invention has been made in view of the above circumstances, and even in an environment where the ambient temperature is low, such as in a cold district, it is possible to suppress a decrease in charge / discharge characteristics of the power storage device and to exhibit its original performance. The object is to provide a possible elevator control device.

  As means for solving the above-mentioned problems, the invention according to claim 1 is a converter that converts AC power from an AC power source into DC power, and DC voltage from the converter is subjected to variable voltage variable frequency control to AC power. An inverter that converts and supplies this to an AC motor, a semiconductor switching element, and a buck-boost chopper circuit that performs charge control and discharge control during regenerative operation and powering operation of the inverter, and the buck-boost chopper circuit, respectively A power storage device that is charged and discharged by the charge control and discharge control of the power storage device, and is disposed below the power storage device, and consumes regenerative power during the regenerative operation of the inverter, and the power storage device is generated by heat generated during the consumption And a regenerative resistor that raises the temperature of the battery.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, in the power storage device, a heat shield plate for shielding heat generated from the regenerative resistor can be attached only during a specific period. To do.

  The invention according to claim 3 converts the AC power from the AC power source into DC power, converts the DC power from the converter into AC power by variable voltage variable frequency control, and supplies the AC power to the AC motor. A buck-boost chopper circuit that has an inverter and a semiconductor switching element, and performs charge control and discharge control at the time of regenerative operation and power running operation of the inverter, and charge / discharge by charge control and discharge control of the buck-boost chopper circuit And a power storage device that receives the heat generated by the step-up / step-down chopper circuit at this time via a heat conductive plate.

  The invention according to claim 4 is the invention according to claim 3, wherein the heat conducting plate is removable from the power storage device only during a specific period.

  The invention according to claim 5 converts the AC power from the AC power source into DC power, converts the DC power from the converter into AC power by variable voltage variable frequency control, and supplies the AC power to the AC motor. A buck-boost chopper circuit that has an inverter and a semiconductor switching element, and performs charge control and discharge control at the time of regenerative operation and power running operation of the inverter, and charge / discharge by charge control and discharge control of the buck-boost chopper circuit And a power storage device that receives heat generated in the step-up / step-down chopper circuit through a heat conduction plate at this time, and is disposed below the power storage device, and consumes regenerative power during the regenerative operation of the inverter. And a regenerative resistor that raises the temperature of the power storage device by heat generated during consumption.

  According to a sixth aspect of the present invention, in the fifth aspect of the invention, the power storage device is configured such that a heat shielding plate that shields heat generated from the regenerative resistor can be attached only during a specific period, and the heat conducting plate Is detachable from the power storage device only during a specific period.

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, further comprising temperature detection means for detecting the temperature of the power storage device, wherein the temperature detected by the temperature detection means is equal to or less than a predetermined value. In this case, the elevator is operated to raise the temperature of the power storage device regardless of the presence or absence of passengers.

  The invention according to claim 8 is the invention according to any one of claims 1 to 6, wherein the elevator is operated to raise the temperature of the power storage device before or after a predetermined time period regardless of the presence or absence of passengers. It is characterized by that.

  The invention according to claim 9 is the invention according to any one of claims 1 to 6, further comprising usage frequency information collecting means for collecting the usage frequency information of the elevator, and the usage frequency from the usage frequency information collecting means. Based on the information, the elevator is operated and the temperature of the power storage device is raised before the time period when the frequency of use is high, regardless of the presence or absence of passengers.

  According to the present invention, the regenerative electric power is consumed by the regenerative resistor, and the ambient temperature of the thermal energy power storage device generated at the time of consumption can be raised. Characteristics can be obtained.

  FIG. 1 is an external perspective view showing a main part configuration of an elevator control apparatus according to a first embodiment of the present invention. The electrical connection configuration of each device in the present embodiment and the following embodiments is the same as that in FIG.

  In FIG. 1, the power storage device 9 is housed in a housing 10, and an opening 10 a is formed at the bottom of the housing 10. A regenerative resistor 6 is disposed below the opening 10a.

  Therefore, according to the configuration of FIG. 1, when the input switch 7 is turned on during the regenerative operation and the regenerative power is consumed by the regenerative resistor 6, the thermal energy 11 generated during the consumption rises toward the opening 10a. Then, the temperature of the air inside the housing 10 is increased. Therefore, the ambient temperature of the power storage device 9 rises, and good charge / discharge characteristics of the power storage device 9 can be obtained even in a cold region.

  In the conventional apparatus, the heat energy 11 generated from the regenerative resistor 6 is simply dissipated into the air and is not used effectively. However, according to the configuration of FIG. Thus, it is possible to effectively use the thermal energy 11 that has only been used to increase the ambient temperature of the power storage device 9, and to improve the energy saving efficiency with an inexpensive configuration.

  By the way, even in a cold region, an extremely low temperature does not continue throughout the year, and the temperature does not decrease so much during a specific period such as summer. Even in such a period, if the thermal energy 11 from the regenerative resistor 6 is sent into the housing 10 through the opening 10a, the ambient temperature of the power storage device 9 becomes too high, which may adversely affect the life.

  Therefore, a heat shielding plate (not shown) that closes the opening 10a may be attached to the housing 10 of FIG. 1 only during the summer period using a screw member or the like. According to this, since the heat energy 11 can be shielded by the heat shielding plate, it is possible to avoid adversely affecting the life of the power storage device 9.

  FIG. 2 is an external perspective view showing a main configuration of an elevator control apparatus according to the second embodiment of the present invention. In this figure, semiconductor modules 86 of switching elements 81 and 82 and diodes 83 and 84 are attached to the front surface of the cooling fin 12. Then, one end side of the heat conduction plate 13 is attached to the side surface portion of the cooling fin 12 by an attachment screw 14, and the other end side of the heat conduction plate 13 is attached to the side surface portion of the power storage device 9 by the attachment screw 14. It has been.

  When charge control or discharge control is performed on the step-up / step-down chopper circuit 8, current flows through some of the switching elements 81 and 82 and the diodes 83 and 84, so that the semiconductor module 86 generates heat. A part of the heat generated at this time is conducted to the power storage device 9 through the cooling fins 12 and the heat conducting plate 13. Therefore, the temperature of the power storage device 9 rises, and as in the case of the first embodiment, good charge / discharge characteristics of the power storage device 9 can be obtained even in a cold region.

  Further, by loosening the mounting screw 14 and removing the heat conducting plate 13 during a specific period such as summer, it is possible to avoid adversely affecting the life due to the temperature of the power storage device 9 becoming too high.

  The embodiments of the present invention are generally as described above, but the present invention further includes the following forms.

(1) The first embodiment and the second embodiment may be combined. That is, the configuration shown in FIG. 2 is stored in the casing 10 of FIG. 1 as it is. According to such a configuration, the power storage device 9 can receive the heat from the semiconductor module 86 via the heat conducting plate 13 and can also receive the heat energy 11 from the regenerative resistor 6. Even better charge / discharge characteristics can be obtained.

  In addition, during a specific period such as summer, the opening 10a is blocked with a heat shielding plate and the heat conducting plate 13 is removed, thereby preventing the temperature of the power storage device 9 from becoming too high and adversely affecting the service life. Can do.

(2) In each of the above embodiments, a temperature detecting means for detecting the temperature of the power storage device 9 is provided, and when the detected temperature becomes a certain value or less, the elevator is operated regardless of the presence or absence of passengers. You may make it raise the temperature of the electrical storage apparatus 9. FIG. For example, when the elevator car is raised without passengers, the AC motor 4 acts as a generator, so that regenerative operation is performed. Therefore, in the case of the configuration of FIG. 1, the temperature of the power storage device 9 is increased by the thermal energy 11 from the regenerative resistor 6, and in the case of the configuration of FIG. 2, the power storage device 9 is removed from the semiconductor module 86 via the heat conduction plate 13. The temperature rises due to heat. As described above, when the temperature detected by the power storage device 9 is equal to or lower than a certain value, it is possible to always obtain good charge / discharge characteristics even in a cold region by configuring the elevator regardless of the presence or absence of passengers. it can.

(3) In each of the above embodiments, the elevator may be operated to raise the temperature of the power storage device 9 before a predetermined time period regardless of the presence or absence of passengers. For example, in office buildings and the like, since the working hours are fixed, the elevator usage start time can be predicted to a certain degree of accuracy. Therefore, by operating the elevator several times before this work time zone and raising the temperature of the power storage device 9, the power storage device 9 has its original performance during the work time zone where the frequency of use is actually high. Can be demonstrated.

(4) In each of the above-described embodiments, a usage frequency information collecting unit that collects the usage frequency information of the elevator is provided. Based on the usage frequency information from the usage frequency information collecting unit, a time period in which the usage frequency is high Prior to this, the elevator may be operated to raise the temperature of the power storage device 9 regardless of the presence or absence of passengers.

  As described above, in the case of an office building or the like, it is relatively easy to predict a time zone in which the elevator usage frequency is high, but in the case of a department store or an apartment, such prediction is difficult. Therefore, instead of setting the time zone when the usage frequency is high as fixed data, the usage frequency information based on the actual operation results of the elevator is collected, and the most frequently used frequency specified by this usage frequency information Before the time when the temperature rises, the elevator is operated regardless of the presence or absence of passengers and the temperature of the power storage device 9 is raised. According to such a configuration, the time zone in which the usage frequency is highest can always be known based on the latest usage frequency information, and the operation of the elevator for keeping the temperature of the power storage device 9 is effectively performed. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view showing a main configuration of an elevator control device according to a first embodiment of the present invention. The external appearance perspective view which shows the principal part structure of the elevator control apparatus which concerns on the 2nd Embodiment of this invention. The block diagram of the conventional elevator control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 AC power supply 2 Converter 3 Inverter 4 AC motor 5 Smoothing capacitor 6 Regenerative resistor 7 Input switch 8 Buck-boost chopper circuit 81, 82 Switching element 83, 84 Diode 85 Reactor 86 Semiconductor module 9 Power storage device 10 Case 10a Opening part 11 Thermal energy 12 Cooling fin 13 Heat conduction plate 14 Mounting screw

Claims (9)

A converter that converts AC power from an AC power source into DC power;
DC power from the converter is converted into AC power by variable voltage variable frequency control, and this is supplied to an AC motor, and an inverter;
A step-up / step-down chopper circuit having a semiconductor switching element, wherein charge control and discharge control are performed during regenerative operation and powering operation of the inverter, respectively;
A power storage device that is charged and discharged by charge control and discharge control of the step-up / down chopper circuit, and
A regenerative resistor that is disposed below the power storage device, consumes regenerative power during the regenerative operation of the inverter, and raises the temperature of the power storage device by heat generated during the consumption;
An elevator control device comprising: In the power storage device, a heat shield plate that shields heat generated from the regenerative resistor can be attached only during a specific period.
The elevator control device according to claim 1. A converter that converts AC power from an AC power source into DC power;
DC power from the converter is converted into AC power by variable voltage variable frequency control, and this is supplied to an AC motor, and an inverter;
A step-up / step-down chopper circuit having a semiconductor switching element, wherein charge control and discharge control are performed during regenerative operation and powering operation of the inverter, respectively;
Charging and discharging is performed by charge control and discharge control of the step-up / down chopper circuit, and a power storage device that further receives heat generated in the step-up / step-down chopper circuit through a heat conduction plate at this time,
An elevator control device comprising: The heat conducting plate is removable from the power storage device only during a specific period.
The elevator control device according to claim 3. A converter that converts AC power from an AC power source into DC power;
DC power from the converter is converted into AC power by variable voltage variable frequency control, and this is supplied to an AC motor, and an inverter;
A step-up / step-down chopper circuit having a semiconductor switching element, wherein charge control and discharge control are performed during regenerative operation and powering operation of the inverter, respectively;
Charging and discharging is performed by charge control and discharge control of the step-up / down chopper circuit, and a power storage device that further receives heat generated in the step-up / step-down chopper circuit through a heat conduction plate at this time,
A regenerative resistor that is disposed below the power storage device, consumes regenerative power during the regenerative operation of the inverter, and raises the temperature of the power storage device due to heat generated during the consumption;
An elevator control device comprising: The power storage device can be attached only during a specific period of a heat shield plate that shields heat generated from the regenerative resistor,
The heat conducting plate is removable from the power storage device only during a specific period.
The elevator control device according to claim 5. Comprising temperature detecting means for detecting the temperature of the power storage device;
If the temperature detected by the temperature detection means is below a certain value, the elevator is operated regardless of the presence or absence of passengers to increase the temperature of the power storage device,
The elevator control device according to any one of claims 1 to 6. Before the predetermined time zone, the elevator is operated regardless of the presence or absence of passengers, and the temperature of the power storage device is raised.
The elevator control device according to any one of claims 1 to 6. Equipped with usage frequency information collecting means for collecting elevator usage frequency information,
Based on the usage frequency information from this usage frequency information collecting means, the elevator is operated to raise the temperature of the power storage device before the time zone when the usage frequency becomes high, regardless of the presence or absence of passengers,
The elevator control device according to any one of claims 1 to 6.

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