JP2013234028A - Elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator capable of maintaining normal operation without stopping car operation even when a power-supply voltage drops.SOLUTION: A power supply circuit 20, which connects a commercial AC power supply 1 and a motor 5 for driving a car 8, includes: a converter device 2 which rectifies an AC voltage from the commercial AC power supply 1; an inverter device 4 which converts a rectified DC voltage to a variable-voltage and variable-frequency AC voltage to output the AC to the converter device 2; a smoothing capacitor 3 which is provided between the converter device 2 and the inverter device 4; a storage circuit 22 which is provided between the converter device 2 and the smoothing capacitor 3, which stores electric power and which supplies the stored electric power to the inverter device 4; an adding circuit 6 which adds the voltage of the converter device 2 and the voltage of the storage circuit 22 to output the added voltages to the inverter device 4; and a control device which performs control to change the voltage of the storage circuit 22 to a voltage equivalent to the amount of voltage drop from the commercial AC power supply 1.

Description

  The present invention relates to an elevator including a circuit for supplying electric power to driving means for driving a passenger car.

  FIG. 6 is a diagram showing a configuration of a conventional elevator.

  In general, an elevator includes a car 108 that moves up and down in a hoistway (not shown) provided in a building as shown in FIG. 6, a counterweight 109 that moves up and down relative to the car 108, and these. The main rope 106 for suspending the car 108 and the counterweight 109, and a hoisting machine as driving means around which the main rope 106 is wound.

  The hoisting machine includes a sheave 107 around which a main rope 106 is directly wound, and a motor 105 that rotates the sheave 107. The motor 105 is driven by receiving electric power to rotate the sheave 107, and the car 108 and the counterweight 109 are moved up and down in the hoistway according to the rotation direction of the sheave 107.

  The motor 105 is connected to a commercial AC power source 101 as a power source for supplying power. The commercial AC power supply 101 is, for example, transmitted from an electric power company and outputs an AC voltage having a certain frequency to a connected device. In FIG. 6, the AC voltage output from the commercial AC power supply 101 is once converted into a DC voltage, and then the converted DC voltage is converted into an AC voltage having a variable voltage and a variable frequency suitable for driving the motor 105.

  In the prior art, a power supply circuit 100 is provided between a hoisting machine as a driving means and a commercial AC power supply 101 as a power supply, which mutually converts an AC voltage and a DC voltage. Specifically, the power supply circuit 100 includes, for example, a rectifier circuit that rectifies an AC voltage from a commercial AC power supply 101, that is, a converter device 102 that converts the AC voltage into a DC voltage, and a DC voltage output from the converter device 102. Is converted to an alternating voltage having a variable voltage and a variable frequency, and a smoothing capacitor 103 provided between the converter device 102 and the inverter device 104 is included.

  Here, when the commercial AC power supply 101 has a power failure, power is not supplied from the commercial AC power supply 101 to the motor 105, so the motor 105 stops even when the car 108 is moving up and down in the hoistway. , Passengers may be trapped in the car 108. In order to prevent this, a power storage device 113 that stores power in the power supply circuit 100 and an elevator that supplies power stored in the power storage device 113 instead of the commercial AC power supply 101 in the event of a power failure is proposed as one of the prior arts. (For example, refer to Patent Document 1).

  This prior art elevator has the above-described power storage device 113, a current detection device (not shown) for detecting the direction of the current on the AC input side of the converter device 102, and the direction of the current detected by this current detection device. In addition, the discrimination means for discriminating whether the motor 105 is in power running operation or regenerative operation, the power failure detection device 118 for detecting a power failure of the commercial AC power supply 101, and the discrimination means discriminating that the motor 105 is in power running operation. Or when the power failure detection device 118 detects a power failure, the power stored in the power storage device 113 is supplied to the inverter device 104, and the motor 105 It includes storage voltage control means (not shown) that is driven as a generator and charges the power storage device 113 with regenerative power.

  Therefore, even when the building has a power failure, the storage voltage control means supplies the electric power stored in the power storage device 113 to the motor 105 via the inverter device 104 based on the determination by the determination means, thereby Since the passenger can land on the nearest floor of the lift destination without stopping during the lift, it is possible to prevent passengers from being trapped in the car 108.

JP 2009-62178 A

  The prior art elevator disclosed in Patent Document 1 described above raises and lowers the car 108 at a speed lower than that of normal operation during a power failure and makes it land on the nearest floor of the lift destination. However, in the above-described prior art elevator, even when the voltage output from the commercial AC power supply 101 temporarily drops, the elevator car 108 is moved up and down at a lower speed than the normal operation to land on the nearest floor of the lift destination. To drive. Furthermore, after the nearest floor is stopped, passengers cannot use the elevator until the power state of the commercial AC power supply 101 is completely recovered, and there is a concern that the operating rate of the elevator and the serviceability for passengers may be reduced due to this. ing. In particular, in other countries where infrastructure is not sufficiently developed, the supply power is often unstable, and voltage drops including power outages are likely to occur frequently in the commercial AC power supply 101. There is a risk of becoming.

  The present invention has been made based on such a state of the art, and its purpose is to maintain normal operation without stopping the operation of the car even when the voltage of the power source drops. To provide an elevator.

  In order to achieve the above object, an elevator according to the present invention includes a hoistway, a car that moves up and down in the hoistway, a driving means that drives the car, and a power source that supplies power to the driving means. And a power supply circuit for connecting these driving means and a power supply. The power supply circuit rectifies the AC voltage from the power supply, and converts the DC voltage output from the rectifier circuit to an AC of variable voltage and variable frequency. In an elevator having an inverter device that converts the voltage to output and a smoothing capacitor provided between the rectifier circuit and the inverter device, the power supply circuit is provided between the rectifier circuit and the smoothing capacitor. A power storage circuit that stores power and supplies the stored power to the inverter device, a voltage output from the rectifier circuit, and a power output from the power storage circuit. It is characterized by comprising an adding circuit for adding and outputting to the inverter device, and a controller for variably controlling the voltage corresponding to the voltage of said power storage circuit drops in voltage from the power supply.

  According to the present invention configured as described above, even when the voltage of the power supply drops and the voltage obtained from the rectifier circuit decreases, the power stored in the power storage circuit can be compensated. At this time, the control device can set the voltage output from the power storage circuit to the adder circuit to an appropriate value based on the amount of voltage drop from the power supply, so that the voltage added by the adder circuit causes a voltage drop in the power supply. Equal to the voltage previously output from the rectifier circuit. Therefore, since the voltage output to the inverter device can be kept constant regardless of the voltage drop of the power supply, it is possible to suppress the electrical influence that the driving means receives with the voltage drop of the power supply. Thereby, even if the voltage of the power supply drops, normal operation can be maintained without stopping the operation of the car.

  In the elevator according to the present invention, in the above-described invention, the power storage circuit stores power, discharges the stored power, and a step-up / step-down chopper circuit that boosts or lowers the voltage of the power storage device. The control device controls the step-up / step-down operation of the step-up / step-down chopper circuit in accordance with the amount of voltage drop from the power source.

  In the present invention configured as described above, when the voltage of the power supply drops, even if the voltage of the power storage device is smaller than the voltage drop amount of the power supply, the control device boosts the voltage of the power storage device to the step-up / step-down chopper circuit. By giving the instruction, an output value equal to or higher than the voltage of the original power storage device can be easily obtained by the step-up / down chopper circuit. Thus, a voltage corresponding to the amount of voltage drop of the power supply can be secured from the step-up / step-down chopper circuit, so that the adder circuit can add the voltage of the power supply and the voltage of the power storage device and stably output it to the inverter device. In addition, when the voltage of the power supply drops, even if the voltage of the power storage device is larger than the amount of voltage drop of the power supply, the control device instructs the step-up / step-down chopper circuit to step down the voltage of the power storage device. An output value less than the voltage of the original power storage device can be easily obtained by the pressure chopper circuit. As a result, the voltage output from the step-up / step-down chopper circuit to the addition circuit does not exceed the amount of voltage drop of the power supply and does not become excessive, so the load on the addition circuit can be reduced.

  In the elevator according to the present invention, the step-up / step-down chopper circuit is connected to a capacitor provided between inputs of the adder circuit and one end of the DC bus on the input side of the adder circuit. A first switching element having one end connected to the power storage device, a second switching element having one end connected to the low potential side of the DC bus and the other end connected to the power storage device; The switching device and an inductance connected to a common connection portion of the second switching element, and the control device includes the first switching element and the second switching element according to a voltage drop amount from the power source. A drive signal for driving the switching element is transmitted to the step-up / step-down chopper circuit.

  In the present invention configured as described above, the step-up / step-down chopper circuit receives the drive signal from the control device and drives the first switching element and the second switching element to respond to the voltage drop amount from the power source. Thus, the voltage of the power storage device can be raised and lowered efficiently. As described above, the step-up / step-down operation of the step-up / step-down chopper circuit can be easily realized only by the switching operation of the first switching element and the second switching element, so that the circuit can be reduced in size and weight, Production costs can be reduced.

  Moreover, the elevator according to the present invention is characterized in that, in the above invention, the control device includes a power supply voltage detection device that detects an AC voltage input from the power supply to the rectifier circuit. If comprised in this way, if the voltage of a power supply will fall, the alternating voltage which a rectifier circuit inputs will reduce. Therefore, the power supply voltage detection device detects the change in the AC voltage before the AC voltage from the power supply is converted into the DC voltage in the rectifier circuit, so that the processing operation of the control device can be executed quickly.

  According to the elevator of the present invention, it is possible to provide an elevator that can maintain normal operation without stopping the operation of the car, even when the voltage of the power source drops.

It is a figure which shows the structure of one Embodiment of the elevator which concerns on this invention. 3 is a timing chart showing drive signals for the first switching element and the second switching element in the step-up / step-down chopper circuit provided in the present embodiment shown in FIG. 1. It is a figure explaining the connection state in the buck-boost chopper circuit with which this embodiment shown in FIG. 1 was equipped, and is a figure which shows the state which set the 1st switching element to OFF and the 2nd switching element. It is a figure explaining the connection state in the buck-boost chopper circuit with which this embodiment shown in FIG. 1 was equipped, and is a figure which shows the state which set the 1st switching element to ON and the 2nd switching element. It is a flowchart explaining operation | movement of this embodiment. It is a figure explaining the structure of the elevator of a prior art.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the elevator which concerns on this invention is demonstrated based on figures.

  One embodiment of the elevator according to the present invention is constituted by a rope type elevator as shown in FIG. 1, for example. In the present embodiment, a hoistway (not shown) provided in a building, a car 8 that moves up and down in the hoistway, a counterweight 9 that moves up and down relative to the car 8, and these cars 8 and a counterweight 9 and a hoisting machine as a driving means around which the main rope 21 is wound.

  The hoisting machine includes a sheave 7 on which a main rope 21 is directly wound and a motor 5 that rotates the sheave 7. In addition, the present embodiment includes a power source that supplies power to the motor 5 and a power circuit 20 that connects the motor 5 and the power source, as will be described later. The power source includes, for example, a commercial AC power source 1 that transmits power from a power company and outputs an AC voltage having a constant frequency to a connected device.

  The power supply circuit 20 is a rectifier circuit that rectifies an AC voltage from the commercial AC power supply 1, for example, a converter device 2 that converts an input AC voltage into a DC voltage, and a variable voltage variable for the DC voltage output from the converter device 2. An inverter device 4 that converts the frequency into an alternating voltage of a frequency and outputs it, and a smoothing capacitor 3 provided between the converter device 2 and the inverter device 4 are provided.

  The smoothing capacitor 3 has one end connected to the high potential side of the DC bus and the other end connected to the low potential side of the DC bus so as to remove DC voltage pulsation. The commercial AC power source 1 and the converter device 2 are connected by a three-phase three-wire system, and the converter device 2 and the inverter device 4 are connected by a single-phase two-wire system. The inverter device 4 and the motor 5 are connected by a three-phase three-wire system.

  Therefore, when an AC voltage is output from the commercial AC power source 1 to the converter device 2, the AC voltage is converted into a DC voltage by the converter device 2. After the pulsation is removed by the smoothing capacitor 3, the converted DC voltage is input to the inverter device 4 and converted again to an AC voltage having a variable voltage and variable frequency suitable for driving the motor 5. And if the alternating voltage converted into the motor 5 from the inverter apparatus 4 is output, the motor 5 will receive and drive this alternating voltage, and will rotate the sheave 7 according to the call registration by a passenger. Thereby, the car 8 and the counterweight 9 are raised and lowered in the hoistway according to the rotation direction of the sheave 7.

  In the present embodiment, the power supply circuit 20 is provided between the converter device 2 and the smoothing capacitor 3 in addition to the converter device 2, the smoothing capacitor 3, and the inverter device 4, and stores the power and the stored power. 4, the addition circuit 6 that adds the voltage output from the converter device 2 and the voltage output from the storage circuit 22 to the inverter device 4, and the voltage of the storage circuit 22 is supplied to the commercial AC power source. And a control device (to be described later) that performs control to vary the voltage to a voltage corresponding to the amount of voltage drop from 1.

  Specifically, the power storage circuit 22 described above includes a power storage device 13 that stores power and releases the stored power, and a step-up / step-down chopper circuit that boosts or lowers the voltage of the power storage device 13. Yes. This step-up / step-down chopper circuit is, for example, a capacitor 14 provided between the inputs of the adder circuit 6, a self-extinguishing with one end connected to the DC bus on the input side of the adder circuit 6 and the other end connected to the power storage device 13 A first switching element 10 that is an element, a second switching element 11 that is a self-extinguishing element having one end connected to the low potential side of the DC bus and the other end connected to the power storage device 13, The switching element 10 includes an inductance 12 connected to a common connection portion of the first switching element 10 and the second switching element 11.

  In this embodiment, the step-up / down chopper circuit forms a series circuit in which the capacitor 14 and the first switching element 10 are connected in series, and the series in which the power storage device 13 and the second switching element 11 are connected in series. A circuit is formed, and an inductance 12 is connected in parallel to each of these series circuits. In addition, the electrical storage apparatus 13 is comprised from large capacity capacitors, such as secondary batteries, such as a nickel hydride battery, a lithium ion battery, and a lithium polymer battery, and an electrical capacitor, for example.

  On the other hand, the control device described above controls the step-up / step-down operation of the step-up / step-down chopper circuit in accordance with the amount of voltage drop from the commercial AC power supply 1. Specifically, the control device holds, for example, a DC voltage detection device 15 that detects the voltage of the smoothing capacitor 3 and a reference value of the voltage between the DC buses in a normal state and directs the reference value as a command value. And a voltage command device 16.

  Further, the control device is connected to, for example, the DC voltage detection device 15 and the DC voltage command device 16, and the deviation between the voltage of the smoothing capacitor 3 detected by the DC voltage detection device 15 and the command value received from the DC voltage command device 16 is calculated. A voltage control device 17 to be calculated and a deviation calculated by the voltage control device 17 are taken in, a voltage drop amount of the commercial AC power supply 1 is calculated based on the deviation, and the first voltage drop is calculated according to the calculated voltage drop amount. And a storage voltage control device 19 for transmitting a drive signal for driving the switching element 10 and the second switching element 11 to the step-up / step-down chopper circuit.

  Therefore, when receiving the drive signal from the storage voltage control device 19, the step-up / step-down chopper circuit switches the first switching element 10 and the second switching element 11 to ON or OFF based on the drive signal. ing. In the present embodiment, the drive signal transmitted from the storage voltage control device 19 is an ON or OFF operation by the first switching element 10 and an ON or OFF operation by the second switching element 11 as shown in FIG. Are shown in a timing chart in which they are alternately switched.

  That is, when the first switching element 10 is in the OFF state, the second switching element 11 is in the ON state, and the step-up / down chopper circuit at this time is connected between the terminals of the inductance 12 as shown in FIG. The power storage device 13 is connected, and the power stored in the power storage device 13 is charged to the inductance 12.

  On the other hand, when the first switching element 10 is in the ON state, the second switching element 11 is in the OFF state, and the step-up / down chopper circuit at this time is connected between the terminals of the inductance 12 as shown in FIG. The connected power storage device 13 is disconnected, and the power charged in the inductance 12 is discharged.

In general, the output voltage VDC of the step-up / step-down chopper circuit composed of such elements is obtained by setting the period of the first switching element 10 and the second switching element 11 to T and the ON time of the second switching element 11. When TON and the voltage of the power storage device 13 are E, the following equation (1) is calculated.

  According to this equation (1), the storage voltage control device 19 is configured so that the output voltage VDC of the step-up / step-down chopper circuit is applied to the adder circuit 6 via the capacitor 14 in accordance with the voltage drop amount of the commercial AC power supply 1. The period T of the first switching element 10 and the second switching element 11 and the ON time TON of the second switching element 11 are adjusted.

  Here, since the voltage E of the general power storage device 13 is about 48V, when the voltage drop larger than 48V occurs in the commercial AC power supply 1, the storage voltage control device 19 uses the following equation (1). The voltage of the power storage device 13 is boosted by adjusting the period T of the first switching element 10 and the second switching element 11 and the ON time TON of the second switching element 11 so that TON> (T-TON). I am letting.

  On the other hand, when a voltage drop smaller than 48V occurs in the commercial AC power supply 1, the storage voltage controller 19 causes the first switching element 10 to satisfy TON <(T−TON) in the equation (1). The voltage T of the power storage device 13 is stepped down by adjusting the period T of the second switching element 11 and the ON time TON of the second switching element 11.

  In the present embodiment, the control device has a power supply voltage detection device that detects an AC voltage input from the commercial AC power supply 1 to the converter device 2. This power supply voltage detection device is composed of, for example, a power failure detection device 18 that is connected between the commercial AC power source 1 and the converter device 2 and detects that the commercial AC power source 1 has lost power by measuring the voltage applied during this time. The power failure detection device 18 transmits the detected signal to the storage voltage control device 19.

  In the present embodiment, when the voltage drop of the commercial AC power supply 1 is caused by a power failure, the storage voltage control device 19 takes in a signal from the power failure detection device 18, for example, and is converted to the converter device 2 at the normal time. A drive signal for driving the first switching element 10 and the second switching element 11 is transmitted to the step-up / step-down chopper circuit so that an output value comparable to the voltage can be obtained. Note that the DC voltage converted to the converter device 2 at normal time is considered to be larger than about 48 V of the voltage E of the general power storage device 13, so The operation is to boost.

  Next, the operation of the present embodiment will be described based on the flowchart of FIG.

  In the present embodiment, as shown in FIG. 5, first, the power failure detection device 18 detects a voltage output from the commercial AC power supply 1 to the converter device 2 (step (hereinafter referred to as S) 1), and stores the detected signal. Transmit to the voltage controller 19. Next, the storage voltage control device 19 monitors the voltage state between the commercial AC power source 1 and the converter device 2 based on the signal received from the power failure detection device 18, and is a power failure occurring in the commercial AC power source 1? It is determined whether or not (S2).

  At this time, when the storage voltage control device 19 determines that a power failure has occurred in the commercial AC power supply 1, the first switching is performed so that an output value comparable to the DC voltage converted into the converter device 2 can be obtained during normal operation. A drive signal for driving the element 10 and the second switching element 11 is transmitted to the step-up / step-down chopper circuit. When the step-up / step-down chopper circuit receives the drive signal from the storage voltage control device 19, it switches the first switching element 10 and the second switching element 11 to ON or OFF based on this drive signal, respectively, and the voltage of the storage device 13 Is boosted and output to the adder circuit 6 (S3).

  On the other hand, when the stored voltage controller 19 determines in step S2 that no power failure has occurred in the commercial AC power supply 1, the DC voltage detector 15 detects the voltage of the smoothing capacitor 3 (S4). Next, the voltage control device 17 calculates the deviation between the voltage of the smoothing capacitor 3 detected by the DC voltage detection device 15 and the command value received from the DC voltage command device 16 (S5). Then, the storage voltage control device 19 takes in the deviation calculated by the voltage control device 17, and determines whether or not a voltage drop has occurred in the commercial AC power source 1 based on this deviation (S6).

  At this time, if the storage voltage control device 19 determines that no voltage drop has occurred in the commercial AC power supply 1, the operation returns to the procedure S <b> 1 to operate the car 8 as usual. On the other hand, in step S6, when the storage voltage control device 19 determines that a voltage drop has occurred in the commercial AC power supply 1, the stored voltage control device 19 determines the commercial AC power supply 1 based on the deviation calculated by the voltage control device 17 in step S5. A voltage drop amount is calculated (S7), and a driving signal for driving the first switching element 10 and the second switching element 11 is output so as to output a voltage comparable to the calculated voltage drop amount. Send to circuit.

  The step-up / step-down chopper circuit receives the drive signal from the storage voltage control device 19 and switches the first switching element 10 and the second switching element 11 to ON or OFF based on the drive signal, respectively. The timing of the switching operation of the first switching element 10 and the second switching element 11 is adjusted, and the voltage of the power storage device 13 is stepped up / down and output to the adding circuit 6 (S8).

  When a voltage is output from the step-up / step-down chopper circuit in step S3 or step S8, the adder circuit 6 adds the voltage output from the step-up / step-down chopper circuit and the voltage output from the converter device 2 to the inverter device 4. Output (S9) and supply a constant voltage between the DC buses (S10). Thereby, the operation of the present embodiment is completed.

  According to the present embodiment configured as described above, since the power storage device 13 that stores power is provided between the converter device 2 and the smoothing capacitor 3, a voltage drop occurs in the commercial AC power source 1 including a power failure. Even in this case, it can be supplemented with the electric power stored in the power storage device 13. At this time, the storage voltage control device 19 can step up and down the voltage of the storage device 13 according to the amount of voltage drop from the commercial AC power supply 1 and set it to an appropriate value, so that the voltage added by the addition circuit 6 is It becomes equal to the voltage obtained from the converter device 2 when the commercial AC power supply 1 is normal. Therefore, since the voltage output from the adder circuit 6 to the inverter device 4 can be kept constant regardless of the change in the voltage state of the commercial AC power supply 1, the electric power received by the motor 5 as the voltage of the commercial AC power supply 1 drops. Can be suppressed. Thereby, even if it is a case where the voltage of the commercial alternating current power supply 1 falls, normal driving | operation can be maintained, without stopping operation | movement of the passenger car 8. That is, when the voltage of the commercial AC power supply 1 drops, there is no need to switch to a low speed operation in which the car 8 runs at a speed lower than the normal operation or to stop at the nearest floor. It can be improved and a good service can be provided to passengers.

  In this embodiment, a step-up / step-down chopper circuit for stepping up / step-down the voltage of the power storage device 13 is provided between the converter device 2 and the addition circuit 6, and the power storage voltage control device 19 is connected to the commercial AC in steps S3 and S8. Since the voltage output from the step-up / step-down chopper circuit is made variable in accordance with the amount of voltage drop from the power source 1, when the amount of voltage drop of the commercial AC power source 1 is greater than 48V, An output value exceeding the maximum output voltage of 48 V can be easily taken out. Thereby, the addition circuit 6 can add the voltage of the commercial AC power supply 1 and the voltage of the step-up / step-down chopper circuit and stably output them to the inverter device 4.

  For the same reason, when the amount of voltage drop of the commercial AC power supply 1 is smaller than 48V, the output value of the power storage device 13 having a maximum output voltage of 48V or less can be easily taken out. As a result, the voltage output from the step-up / step-down chopper circuit to the adding circuit 6 does not exceed the amount of voltage drop of the commercial AC power supply 1 and does not become excessive, so the load on the adding circuit 6 can be reduced. Thus, since this embodiment can respond to the change in the voltage drop amount of the commercial AC power supply 1, a good voltage state can be obtained between the DC buses, and the conversion efficiency in the inverter device 4 can be increased. .

  In the present embodiment, the step-up / step-down chopper circuit includes the first switching element 10 and the second switching based on the drive signal from the storage voltage control device 19 as shown in the timing chart of FIG. 2 in steps S3 and S8. By switching the element 11 to ON or OFF, the output voltage VDC of the step-up / step-down chopper circuit is expressed by the period T of the first switching element 10 and the second switching element 11 and Since it can be easily adjusted by the ON time TON of the second switching element 11, the voltage of the power storage device 13 can be efficiently raised or lowered according to the amount of voltage drop from the commercial AC power supply 1. As described above, in this embodiment, the step-up / step-down operation of the step-up / step-down chopper circuit can be easily realized only by the switching operation of the first switching element 10 and the second switching element 11, and thus the circuit is reduced in size and weight. Manufacturing costs can be reduced.

  In the present embodiment, since the power failure detection device 18 measures the voltage applied between the commercial AC power source 1 and the converter device 2 in step S1, it is possible to accurately detect that the commercial AC power source 1 has failed. Can do. Therefore, when no AC voltage is output from the commercial AC power supply 1 to the converter device 2, a detection signal is transmitted from the power failure detection device 18 to the storage voltage control device 19, so that the detection received by the storage voltage control device 19 in step S2 It is possible to quickly determine whether or not a power failure has occurred in the commercial AC power supply 1 based on the signal. Thereby, the processing operation speed of the storage voltage control device 19 can be increased.

  Furthermore, this embodiment provides the power failure detection device 18 between the commercial AC power source 1 and the converter device 2, and when the voltage drop of the commercial AC power source 1 is caused by a power failure, an intermediate procedure S4 is performed. Since the operation of .about.S8 can be omitted, it is not necessary to detect the voltage of the smoothing capacitor 3 by the DC voltage detector 15, calculate the deviation by the voltage controller 17, and calculate the voltage drop by the storage voltage controller 19. The processing operation can be executed efficiently.

  In addition, although this embodiment mentioned above demonstrated the case where it applied to the rope type elevator driven with the motor 5, it is not restricted to this case, The elevator of a pump drive, the winding drum type elevator for housing, or You may apply to a self-propelled elevator etc.

  Moreover, although this embodiment demonstrated the case where the buck-boost chopper circuit was used as what raises / lowers the voltage of the electrical storage apparatus 13 in the electrical storage circuit 22, it is not restricted to this case, but circuit configuration instead of the buck-boost chopper circuit However, a simple step-up chopper circuit or step-down chopper circuit may be provided. By providing the step-up / step-down chopper circuit as in the present embodiment, when the voltage drop amount of the commercial AC power supply 1 is larger than the maximum output voltage 48V of the power storage device 13, and when the voltage drop amount of the commercial AC power supply 1 is the power storage device It is possible to cope with two events when the maximum output voltage of 13 is smaller than 48V with one circuit.

  Moreover, although this embodiment demonstrated the case where the power supply voltage detection apparatus consisted of the power failure detection apparatus 18 which detects that the commercial alternating current power supply 1 failed, the power supply voltage detection apparatus is not limited to this case, for example, a commercial alternating current power supply. The accumulator voltage control device 19 is connected between the power source 1 and the converter device 2 and includes an AC voltage detection device that detects a voltage drop of the commercial current power source 1 by measuring a voltage output from the commercial AC power source 1. You may vary the voltage of the electrical storage circuit 22 based on the amount of voltage drop of the commercial AC power supply 1 detected by this AC voltage detection device.

  In this case, when the voltage of the commercial AC power supply 1 drops, the AC voltage detection device detects a change in the AC voltage before the converter apparatus 2 converts the AC voltage from the commercial AC power supply 1 into a DC voltage. Thus, the processing operation of the storage voltage control device 19 can be executed more quickly. Furthermore, since the AC voltage detection device directly detects the AC voltage output from the commercial AC power supply 1 to the converter device 2, it is possible to reduce errors due to voltage loss lost as heat by power transmission. . Thereby, the accuracy of the processing operation of the storage voltage control device 19 can be improved.

  As described above, according to this embodiment, even when the voltage of the power supply drops, the control device of the power supply circuit changes the voltage of the storage circuit to a voltage corresponding to the amount of voltage drop from the power supply. Since the voltage output from the rectifier circuit and the voltage output from the storage circuit are added by the adder circuit and output to the inverter device, the voltage output to the inverter device can be kept constant. Thereby, since the electrical influence which a drive means receives with the voltage drop of a power supply can be suppressed, a cage | basket | car can be raised / lowered normally in a hoistway with the drive force of a drive means. In this way, even if the power supply voltage drops, normal operation can be maintained without stopping the operation of the car, so the elevator operating rate can be improved compared to the conventional, High quality service can be provided.

  In addition, in this embodiment, about the case where a power failure generate | occur | produces, after driving to the nearest floor and opening a door and taking a passenger down, the driving | operation which stops is performed. However, as long as safety can be ensured so that confinement or the like does not occur, the elevator may be continuously operated until the electric power stored in the power storage device 13 is exhausted.

1 Commercial AC power supply
DESCRIPTION OF SYMBOLS 2 Converter apparatus 3 Smoothing capacitor 4 Inverter apparatus 5 Motor 6 Adder circuit 7 Sheave 8 Car cage 9 Balance weight 10 1st switching element 11 2nd switching element 12 Inductance 13 Power storage apparatus 14 Capacitor 15 DC voltage detection apparatus 16 DC voltage command Device 17 Voltage control device 18 Power failure detection device 19 Storage voltage control device 20 Power supply circuit 21 Main rope 22 Storage circuit

Claims (4)

A hoistway, a car moving up and down in the hoistway, driving means for driving the car, a power source for supplying power to the driving means, and a power supply circuit for connecting the driving means and the power source. The power supply circuit includes a rectifier circuit that rectifies an AC voltage from the power supply, an inverter device that converts a DC voltage output from the rectifier circuit into an AC voltage having a variable voltage and a variable frequency, and these rectifier circuits. And an elevator having a smoothing capacitor provided between the inverter device and the inverter device,
The power supply circuit is
A power storage circuit provided between the rectifier circuit and the smoothing capacitor, for storing electric power and supplying the stored electric power to the inverter device;
An adding circuit that adds the voltage output from the rectifier circuit and the voltage output from the storage circuit and outputs the sum to the inverter device;
An elevator comprising: a control device that performs control to vary a voltage of the power storage circuit to a voltage corresponding to a voltage drop amount from the power source. In the elevator according to claim 1,
The storage circuit is
A power storage device that stores electric power and releases the stored electric power;
It consists of a buck-boost chopper circuit that boosts or lowers the voltage of this power storage device,
The control device includes:
An elevator characterized by controlling a step-up / step-down operation of the step-up / step-down chopper circuit according to an amount of voltage drop from the power source. In the elevator according to claim 2,
The buck-boost chopper circuit is
A capacitor provided between the inputs of the adder circuit;
A first switching element having one end connected to the DC bus on the input side of the adder circuit and the other end connected to the power storage device;
A second switching element having one end connected to the low potential side of the DC bus and the other end connected to the power storage device;
An inductance connected to a common connection portion of the first switching element and the second switching element,
The control device includes:
The elevator characterized by transmitting the drive signal which drives the said 1st switching element and the said 2nd switching element to the said pressure | voltage rise / fall chopper circuit according to the amount of voltage drops from the said power supply. In the elevator according to any one of claims 1 to 3,
The said control apparatus has a power supply voltage detection apparatus which detects the alternating voltage input into the said rectifier circuit from the said power supply, The elevator characterized by the above-mentioned.

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