JP2006176257A - Elevator control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-costed elevator control device by using one charging device for a capacitor in a main circuit and for a storage battery in a charging circuit in common. <P>SOLUTION: The elevator control device is provided with an inverter for outputting the alternating current power for driving a motor of an elevator, a converter connected to an alternating current power source to supply the direct current power to the inverter, a smoothing capacitor for smoothing the direct current power output from the converter, a driving device for controlling drive of the motor by controlling the inverter, and a charging device for supplying the power to the smoothing capacitor when the power is not supplied from the converter. The elevator control device is also provided with an interruption-of-service detecting device for detecting loss of the power supply from the alternating current power source and the storage battery to be connected to the smoothing capacitor and the inverter to supply the direct current power when the interruption-of-service detecting device detects loss of the power source, and the storage battery is charged from the alternating current power source by the charging device. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an elevator control device during emergency operation such as a power failure.

  If the power supply from the elevator commercial power source is interrupted due to a power failure or the like, or if an emergency stop command is issued for a reason other than the operation of the elevator safety device, the elevator car stops suddenly. At this time, if the car stops between the landings, the door cannot be opened, and the passenger is trapped in the car. In preparation for such a case, the conventional elevator control device is provided with a charging circuit composed of a DC power source such as a lead-acid battery or an inverter device. When a power failure or the like actually occurs, the charging circuit By outputting three-phase AC power, the car is moved to the nearest floor and passengers confined in the car are rescued. In such a conventional elevator control device, for example, the voltage of the storage battery during the rescue operation is detected by a voltage detector, and the discharge current is detected by the current detector, so that the voltage of the storage battery is predetermined during the rescue operation. When the level becomes equal to or lower than the level value, the rescue operation speed is changed by the CPU, the voltage drop of the storage battery is suppressed, and the rescue operation is continued (see Patent Document 1).

JP-A-8-169658

  The elevator control device described in Patent Document 1 allows the rescue operation to be continued by changing the operation state of the car according to the capacity of the storage battery even when the capacity of the storage battery used as a power source during a power failure or the like decreases. At the same time, the storage battery is always kept in a state that can cope with the rescue operation. However, in such an elevator control device, the charging device for the storage battery in the charging circuit and the charging device for the smoothing capacitor of the inverter, which are normally provided in the control device of the main circuit, are configured separately, which increases the cost. It was a factor to invite.

  The present invention has been made in order to solve the above-described problems, and an object of the invention is to provide an inexpensive elevator control device by combining a capacitor charging device in the main circuit and a storage battery charging device in the charging circuit. Is to provide.

  An elevator control apparatus according to the present invention includes an inverter that outputs AC power for driving an elevator motor, a converter that is connected to an AC power source and that supplies DC power to the inverter, and a smoothing capacitor that smoothes the DC power output from the converter. A drive device that controls the drive of the motor by controlling the inverter, and a charging device that supplies power to the smoothing capacitor when there is no power supply from the converter, and detects that the power supply from the AC power source has been lost. A power failure detection device and a storage battery that is connected to the smoothing capacitor and the inverter and supplies DC power when the power failure detection device detects a loss of power source are charged by the charging device from the AC power source.

  The present invention controls an inverter that outputs AC power for driving an elevator motor, a converter that is connected to an AC power source and supplies DC power to the inverter, a smoothing capacitor that smoothes DC power output from the converter, and the inverter A power supply detecting device for detecting that the power supply from the AC power source is lost, comprising a drive device for driving and controlling the motor, a charging device for supplying power to the smoothing capacitor when there is no power supply from the converter, When the power failure detection device detects a loss of power supply, the storage battery is connected to the smoothing capacitor and the inverter and supplies DC power, and the storage battery is charged by the charging device from the AC power supply. By combining the charger and the storage battery charger in the charging circuit Rukoto can.

  In order to explain the present invention in more detail, it will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

Embodiment 1 FIG.
1 is a configuration diagram of an elevator control apparatus according to Embodiment 1 of the present invention. In FIG. 1, 1 is a commercial three-phase AC power source, 2 is connected to a commercial three-phase AC power source 1, and is closed during normal operation of the elevator, that is, is closed, 3 is an electromagnetic contactor contact on the AC side 2 is connected to the converter 2 for converting an AC voltage into a DC voltage, 4 is connected to the DC side of the converter 3, a smoothing capacitor for smoothing the output voltage of the converter 3, 5 is connected to both sides of the smoothing capacitor 4, and the DC voltage Is converted into a three-phase AC voltage having a variable voltage and a variable frequency.

  Reference numeral 6 denotes a three-phase induction motor (motor) for driving an elevator connected to the AC side of the inverter 5, reference numeral 7 denotes a current detector for detecting the current of the three-phase induction motor 6, and reference numeral 8 is linked to a drive shaft of the motor 6. A rotating sheave, 9 an elevator car that moves up and down in the hoistway, 10 a counterweight that moves up and down in the hoistway in the opposite direction to the car 9, and the car 9 and the counterweight 10 are The main rope 11 wound around the drive sheave 8 is suspended in a fishing bottle type.

  A relay contact 12 is connected to the commercial three-phase AC power source 1 and is closed during normal operation and is opened by being energized by a storage battery described later during an emergency operation such as a power failure. 12, a control transformer for supplying control power to a control power supply device to be described later during normal operation, 14 is connected to the load side of the control transformer 13 and is output during normal operation, and 15 is connected to the control power supply device 14. The connected control device in the main circuit, 16 is a CPU connected to the control device 15, 17 is connected to the current detector 7, the control device 15 and the CPU 16, and controls the drive of the motor 6 by controlling the inverter 5. The driving device 18 is supplied with an AC voltage from the control device 15, charges the smoothing capacitor 4 of the inverter 5, and does not supply power from the converter 3. A charging device for supplying electric power to the smoothing capacitor 4 when.

  In the main circuit having such a configuration, the electromagnetic contactor contact 2 and the relay contact 12 are closed during normal operation of the elevator. Further, during normal operation, the three-phase AC voltage from the commercial three-phase AC power source 1 is converted into a DC voltage by the converter 3, smoothed by the smoothing capacitor 4, and supplied to the inverter 5. On the other hand, the three-phase AC voltage from the commercial three-phase AC power supply 1 is also supplied to the control transformer 13 via the relay contact 12, and is stepped down to the control voltage by the control transformer 13. The control voltage stepped down by the control transformer 13 is supplied to the control device 15 via the control power supply device 14, and the drive device 17 is a current that is the current value of the control device 15, the output of the CPU 16, and the three-phase induction motor 6. Based on the output of the detector 7, the inverter 5 is controlled. The inverter 5 converts the input DC voltage into an appropriate three-phase AC voltage under the control of the driving device 17 and controls the rotation speed of the three-phase induction motor 6. Accordingly, the car 9 and the counterweight 10 are moved up and down in the hoistway in opposite directions by the main rope 11 moving in conjunction with the rotation of the driving sheave 8. In order to prevent the magnetic contactor contact 2 from being welded due to an inrush current to the smoothing capacitor 4 during normal operation of the elevator, the smoothing capacitor 4 is set to a predetermined voltage by the charging device 18 supplied with power from the control device 15. It is charged.

Next, the charging circuit will be described.
Reference numeral 19 denotes an electromagnetic contactor contact which is connected to the DC side of the converter 3 and is energized and closed by a storage battery, which will be described later, during emergency operation. Reference numeral 20 denotes a control power supply 14 which is connected to a commercial three-phase AC power supply due to a power failure or failure. The power failure detection device 21 that detects that the power supply from 1 has been cut off, 21 supplies power to the main circuit during emergency operation, that is, the power failure detection device 20 cuts off the power supply from the commercial three-phase AC power source 1. That is, a storage battery that supplies power to the inverter 5 and the driving device 17 when power loss is detected, 22 is a voltage detector that detects the voltage of the storage battery 21, and 23 is a charging circuit connected to the storage battery 21. The control device 24 is connected to the control device 23 on the DC side, and converts the DC voltage from the control device 23 into a three-phase AC voltage having the same frequency as that of the commercial three-phase AC power source 1, and 25 is an inverter. 4 is connected to the AC side and boosts the output voltage from the inverter 24 to the same voltage as that of the commercial three-phase AC power source 1, and 26 is connected to the load side of the boost transformer 25 and the power source side of the control transformer 13, It is a relay contact that is energized and closed by the storage battery 21 during operation. The charging device 18 that charges the smoothing capacitor 4 of the main circuit is configured to simultaneously charge the storage battery 21 during normal operation. That is, the charging device 18 is a common charging device for the smoothing capacitor 4 and the storage battery 21. Here, 27 is connected between the smoothing capacitor 4 and the charging device 18, and between the storage battery 21 and the charging device 18, and it is detected that the power supply from the commercial three-phase AC power source 1 is cut off by the power failure detection device 20. It is an electromagnetic contactor contact that is opened during emergency operation.

  In the charging circuit having such a configuration, the electromagnetic contactor contact 27 is closed and the electromagnetic contactor contact 19 and the relay contact 26 are opened during normal operation of the elevator. Therefore, the storage battery 21 is charged to a predetermined voltage by the charging device 18 that is supplied with power from the commercial three-phase AC power source 1 via the control device 15.

  When the power supply from the commercial three-phase AC power supply 1 is interrupted due to a power failure or the like in the elevator control device having the above configuration, the power failure detection device 20 detects this power interruption and controls the power failure detection signal. Output to the device 23. When a power failure detection signal is input to the control device 23, each electromagnetic contactor and relay are energized or de-energized, whereby the electromagnetic contactor contacts 2 and 27 and the relay contact 12 are opened, and the electromagnetic contactor contact. 19 and the relay contact 26 are closed. The DC voltage from the storage battery 21 is supplied to the inverter 5 via the electromagnetic contactor contact 19 and is converted into the same frequency and voltage as those of the commercial three-phase AC power source 1 by the inverter 24 and the step-up transformer 25. The power is supplied to the control transformer 13 through the contact 26. The three-phase AC voltage input to the control transformer 13 is stepped down to the control voltage by the control transformer 13 and supplied to the control device 15 through the control power supply device 14 in the same manner as during normal operation. Further, the drive device 17 controls the inverter 5 based on the control device 15 and the output of the CPU 16 and the output of the current detector 7 that is the current value of the three-phase induction motor 6. Since the magnetic contactor contact 27 is opened during emergency operation, the voltage of the smoothing capacitor 4 of the inverter 5 is equivalent to the voltage of the storage battery 21 and charging from the charging device 18 is stopped.

  FIG. 2 is a configuration diagram of the charging device 18 according to Embodiment 1 of the present invention. In FIG. 2, reference numeral 28 denotes a charging transformer which is connected to the control device 15 on the power source side and charges the smoothing capacitor 4 and the storage battery 21 of the inverter 5, 29 is a rectifier, 30 is a charging resistor, 31 is a diode, 29 a, 30 a And 31a represent a rectifier, a charging resistor and a diode for charging the smoothing capacitor 4, and 29b, 30b and 31b represent a rectifier, a charging resistor and a diode for charging the storage battery 21, respectively. The charging transformer 28 is provided with a charging winding for the smoothing capacitor 4 and a charging winding for the storage battery 21. The charging winding for the smoothing capacitor 4 is sequentially passed through a rectifier 29a, a charging resistor 30a, and a diode 31a. The smoothing capacitor 4 has a configuration that extends from the charging winding for the storage battery 21 to the storage battery 21 through the rectifier 29b, the charging resistor 30b, and the diode 31b in this order. That is, the charging winding for the smoothing capacitor 4 of the charging transformer 28 has a configuration for charging the smoothing capacitor 4 to a voltage value suitable for the main circuit, while the charging winding for the storage battery 21 of the charging transformer 28 is The storage battery 21 is charged to an optimum voltage value.

  According to Embodiment 1 of the present invention, the smoothing capacitor 4 of the inverter 5 of the main circuit and the storage battery 21 of the charging circuit are batched by the charging device 18 that is supplied with power from the commercial three-phase AC power source 1 during normal operation of the elevator. Therefore, it is not necessary to arrange a charging device for the smoothing capacitor 4 and a charging device for the storage battery 21 as in the prior art, and it is possible to reduce the cost with a simple configuration. Further, since the charging device 18 for the smoothing capacitor 4 and the charging device 18 for the storage battery 21 are shared, by providing a monitoring system for remotely monitoring the operation of the charging device 18, an appropriate replacement time for the storage battery 21 can be set. It is also possible to decide, and the maintenance cost can be reduced. Note that, by remotely monitoring the charging device 18 or the like, the failure can be found instantaneously, so that the reliability and quality of the control device can be improved.

Embodiment 2. FIG.
FIG. 3 is a configuration diagram of the charging device 18 according to the second embodiment of the present invention. In FIG. 3, 28 is a charging transformer for charging the smoothing capacitor 4 and the storage battery 21 of the inverter 5 with the power supply side connected to the control device 15, and 29 is a charging for the smoothing capacitor 4 and a storage battery connected to the charging transformer 28. The rectifier also serves for charging 21, 30 is a charging resistor, 31 is a diode, 30 a and 31 a are charging resistors and diodes for charging the smoothing capacitor 4, respectively, 30 b and 31 b are charging resistors for charging the storage battery 21 and A diode is shown. That is, from the charging winding of the charging transformer 28 to the smoothing capacitor 4 via the rectifier 29, the charging resistor 30a and the diode 31a, and to the storage battery 21 via the rectifier 29, the charging resistor 30b and the diode 31b. It has a configuration. Here, an optimum time constant for charging the smoothing capacitor 4 is selected for the charging resistor 30a, and an optimum time constant for charging the storage battery 21 is selected for the charging resistor 30b. Are charged to different voltages. Other configurations of the main circuit and the charging circuit are the same as those in the first embodiment. Since the smoothing capacitor 4 and the storage battery 21 can be charged to different voltages due to differences in the current limiting resistance values of the charging resistors 30a and 30b, this configuration simplifies the configuration of the charging device 18 and further reduces the cost. Can be reduced. The other effects are the same as those of the first embodiment.

Embodiment 3 FIG.
FIG. 4 is a configuration diagram of an elevator control apparatus according to Embodiment 3 of the present invention. In FIG. 4, reference numeral 32 denotes a charging device that is supplied with AC voltage from the control device 15 and charges the smoothing capacitor 4 of the inverter 5 and the storage battery 21 of the charging circuit, and 33 is a voltage detector that detects the voltage of the smoothing capacitor 4. It is. In addition, 27a is connected to the charging device 32 and the smoothing capacitor 4, and is an electromagnetic contactor contact that is opened during an emergency operation. 27b is connected to the voltage detector 33 and the storage battery 21. An electromagnetic contactor contact that is opened when it is detected that the voltage exceeds a predetermined value.

  FIG. 5 is a configuration diagram of the charging device 32 according to the third embodiment of the present invention. In FIG. 5, 28 is a charging transformer, 29 is a rectifier, 30 is a charging resistor, 31 is a diode, and the smoothing capacitor 4 and the storage battery 21 of the inverter 5 are respectively connected in parallel to the charging device 32.

  In the elevator control device having such a configuration, the electromagnetic contactor contacts 27a and 27b are closed during normal operation of the elevator. Further, during normal operation, the three-phase AC voltage from the commercial three-phase AC power source 1 is supplied to the control transformer 13 via the relay contact 12, and the control voltage stepped down by the control transformer 13 is the control voltage power source device 14. And then supplied to the control device 15. The charging device 32 is supplied with power from the control device 15 and charges the smoothing capacitor 4 of the inverter 5 to a predetermined voltage. Here, the voltage value of the smoothing capacitor 4 is maintained at a stable value V <b> 1 when the charging current via the charging resistor 30 of the charging device 32 is supplied to the smoothing capacitor 4. The storage battery 21 has one voltage Vb, and is charged with V2 (= Vb + N) as a whole by connecting N in series. Here, V2 is set to a value that satisfies the relational expression of V2≈V1 + α. Α represents a value that always keeps the storage battery fully charged. On the other hand, during regenerative operation, the voltage of the smoothing capacitor 4 may increase due to the operation of the elevator. Therefore, when the voltage of the smoothing capacitor 4 is detected by the voltage detector 33 and the detected voltage exceeds the specified value (V2 + α). The electromagnetic contactor contact 27b is opened, and the charging circuit, that is, the storage battery 21 is separated from the main circuit.

  On the other hand, the operation of the elevator during emergency operation is the same as that of the first embodiment. Here, at the time of emergency operation, the magnetic contactor contact 27a is opened, the voltage of the smoothing capacitor 4 of the inverter 5 is equivalent to the voltage of the storage battery 21, and charging from the charging device 32 is stopped. .

It is a block diagram of the elevator control apparatus in Embodiment 1 of this invention. It is a block diagram of the charging device in Embodiment 1 of this invention. It is a block diagram of the charging device in Embodiment 2 of this invention. It is a block diagram of the elevator control apparatus in Embodiment 3 of this invention. It is a block diagram of the charging device in Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Commercial three-phase alternating current power supply 2, 19, 27, 27a, 27b Magnetic contactor contact 3 Converter 4 Smoothing capacitor 5, 24 Inverter 6 Three-phase induction motor 7 Current detector 8 Drive sheave 9 Car 10 Counterweight 11 Main rope 12 Relay contact 13 Control transformer 14 Control power supply 15, 23 Control device 16 CPU
17 Drive device 18, 32 Charging device 20 Power failure detection device 21 Storage battery 22, 33 Voltage detector 25 Step-up transformer 26 Relay contact 28 Charging transformer 29, 29a, 29b Rectifier 30, 30a, 30b Charging resistor 31, 31a, 31b Diode

Claims (4)

  An inverter that outputs AC power for driving an elevator motor; a converter that is connected to an AC power source and that supplies DC power to the inverter; a smoothing capacitor that smooths DC power output from the converter; and the inverter is controlled. And a power failure detection device for detecting that the power supply from the AC power supply has been lost, comprising: a drive device that drives and controls the motor by a power supply; and a charging device that supplies power to the smoothing capacitor when there is no power supply from the converter And a storage battery that is connected to the smoothing capacitor and the inverter and supplies DC power when the power failure detection device detects a loss of power, and the storage battery is charged by the charging device from an AC power source. Elevator control device.   2. The elevator control device according to claim 1, wherein the charging device includes a charging transformer having a smoothing capacitor charging winding for charging the smoothing capacitor and a storage battery charging winding for charging the storage battery.   The charging device includes a charging resistor for charging a smoothing capacitor and a charging resistor for charging a storage battery, and the smoothing capacitor and the storage battery are charged to different voltages according to a current limiting resistance value of each charging resistor. The elevator control device according to claim 1. A voltage detector for detecting a voltage of the smoothing capacitor; and a switching contact connected between the charging device and the storage battery, wherein the switching contact has a voltage of the smoothing capacitor exceeding a predetermined value by the voltage detector. The elevator control device according to claim 1, wherein the elevator control device is opened when it is detected.

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