Elevator control device

Abstract

To achieve relaxation of impact shock when power failure occurs and downsizing of a power source circuit of an uninterruptible power supply unit and the like.SOLUTION: An elevator control device comprises: an inverter for converting inputted AC power to driving power of a winch for lifting / lowering a car of an elevator; a power source circuit which switches from the AC current to a battery when input of the AC current stops; and a brake for stopping the car. With the elevator control device, power for controlling the brake is continuously supplied from the power source circuit.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to elevator controls. [Background technology]

[0002] BACKGROUND ART There is known a technique for continuing elevator operation by using power supplied from a battery in the event of a power outage (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-110463 [Patent Document 2] Japanese Patent Application Publication No. 2017-171414 Summary of the Invention [Problem to be solved by the invention]

[0004] If the AC power supply (commercial power supply) that supplies power to the elevator control device is lost due to a power outage or other reason, the power supply to the brake itself and the power supply to the brake control device that controls the brake will be lost, causing forced braking, which could result in a significant impact on passengers in the car.In addition, at this time, the power supply to the inverter that drives the hoist that raises and lowers the elevator will also be lost, which could cause the elevator to become uncontrollable.

[0005] Therefore, in recent years, a power supply circuit such as an uninterruptible power supply with a battery has been installed, and the elevator control device is operated as a backup by the uninterruptible power supply in the event of a power outage. In this case, power is normally supplied to the inverter, brake control device, etc. from an AC power source (commercial power source), and when a power outage is detected, the commercial power supply is switched to battery power supply from the uninterruptible power supply. In this case, when switching from the AC power source to the uninterruptible power supply, a momentary power loss state occurs, causing a loss of power to the brakes and brake control device, which may cause forced braking and cause a relatively large shock to passengers in the elevator car.

[0006] On the other hand, in order to mitigate the shock to passengers, it is conceivable to constantly supply power to the elevator control device from an uninterruptible power supply regardless of whether there is a power outage, and to switch from an AC power source to a battery without momentary interruption in the event of a power outage. However, if power is constantly supplied from the uninterruptible power supply to the elevator control device, power must also be constantly supplied to the inverter that drives the hoist, which could result in the power supply circuit of the uninterruptible power supply and other components becoming larger and more expensive.

[0007] The present disclosure aims to alleviate the impact of a power outage and to reduce the size of power supply circuits such as uninterruptible power supplies. [Means for solving the problem]

[0008] The present disclosure provides, in one aspect, an inverter that converts input AC power into power for driving a hoist that raises and lowers the elevator car; a power supply circuit that switches from the AC power to a battery when the input of the AC power is stopped; a brake for stopping the car; An elevator control device is provided in which power for controlling the brake is constantly supplied from the power supply circuit. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to mitigate the impact of a power outage and to reduce the size of power supply circuits such as uninterruptible power supplies. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing a configuration example of an elevator according to a first embodiment. FIG. [Figure 2] FIG. 1 is a diagram illustrating an example of a configuration of a step-up / step-down converter. [Figure 3] 10 is a timing chart showing an example of a power supply control method in the event of a power outage during regenerative operation of an inverter. [Figure 4] 10 is a timing chart showing an example of a power supply control method in the event of a power outage during power running of an inverter. [Figure 5] FIG. 10 is a diagram showing a configuration example of an elevator according to a second embodiment. [Figure 6] FIG. 10 is a diagram showing a configuration example of an elevator according to a third embodiment. [Figure 7] FIG. 10 is a diagram showing a configuration example of an elevator according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described.

[0012] FIG. 1 is a diagram showing an example of the configuration of an elevator according to the first embodiment. In the elevator 301 shown in FIG. 1, a car 4 and a counterweight 5 are suspended from both ends of a rope 3 wound around the rotating shaft of a hoist 2 (electric motor). The car 4 moves up and down in a bucket-like manner in the opposite direction to the counterweight 5 via the rope 3 as the hoist 2 rotates. Drive control of the hoist 2 is performed by an elevator control device 101. The elevator control device 101 is installed, for example, in an elevator control panel 201 installed in a machine room or the like of the building in which the elevator 301 is installed.

[0013] The elevator 301 operates on AC power Pa supplied from a commercial power source 1 (e.g., a three-phase AC power source), which is an example of an AC power source. However, when the commercial power source 1 experiences a power outage, the power supply from the commercial power source 1 stops. For this reason, a power supply circuit 20 to which a battery 24 is connected is provided in order to continue operating the elevator 301 when the commercial power source 1 experiences a power outage. The power supply circuit 20 is, for example, an uninterruptible power supply (UPS).

[0014] An elevator 301 according to the first embodiment includes an elevator control panel 201, a hoist 2, a rope 3, a car 4, a counterweight 5, a brake 6, and an external device 35. The elevator control panel 201 includes a battery 24 and an elevator control device 101. Here, the brake 6 is a mechanical electromagnetic brake, and stops the movement of the car 4, for example, by bringing a brake shoe into contact with a brake drum. The brake 6 is also configured to apply the brake when the power supply is lost. The brake 6 may be a component of the elevator control device 101.

[0015] The battery 24 is connected to the elevator control device 101. The battery 24 is provided outside the elevator control device 101, but may also be provided inside the elevator control device 101.

[0016] The elevator control device 101 is a device that controls the elevator 301. The elevator control device 101 has an elevation control function that controls the elevation operation of the car 4 of the elevator 301 by a hoist 2, and a braking control function that controls the braking operation of the car 4 by a brake 6.

[0017] The elevator control device 101 includes a switch RY1, a switch RY2, an inverter 10, an inverter control circuit 18, an AC / DC converter 17, a brake control circuit 30, and a power supply circuit 20.

[0018] The inverter 10 is a circuit that converts AC power Pa input from the commercial power source 1 via the input line 7 into power for driving the hoist 2 that raises and lowers the car 4. The inverter 10 drives the hoist 2 in accordance with a drive instruction from an inverter control circuit 18. The inverter 10 supplies the hoist 2 with power Pc required to drive the hoist 2.

[0019] The inverter 10 includes, for example, a converter circuit 11 , an inverter circuit 13 , and a DC link 16 .

[0020] The converter circuit 11 converts AC power Pa input from the commercial power source 1 via the input line 7 into DC power to be supplied to the DC link 16. The AC voltage Va of the AC power Pa is, for example, 400 volts AC. The converter circuit 11 is, for example, a rectifier including a diode bridge composed of multiple diodes. The converter circuit 11 may also be another type of conversion circuit, such as a circuit that converts the AC power Pa into DC power using multiple transistors.

[0021] The inverter circuit 13 converts the DC power in the DC link 16 into power Pc to be supplied to the hoist 2. The power Pc is, for example, three-phase AC power. The inverter circuit 13 converts the frequency of the DC power in the DC link 16 into power Pc of a target frequency and voltage value, for example, in accordance with a drive instruction by pulse width modulation control of the inverter control circuit 18.

[0022] The DC link 16 is connected between the converter circuit 11 and the inverter circuit 13. The DC link 16 includes a capacitor 12 (also referred to as a smoothing capacitor 12). The DC voltage in the DC link 16 is smoothed by the capacitor 12. The DC link 16 may include an inrush current suppression circuit having a resistor 14 and a switch 15. The inrush current suppression circuit turns off (opens) the switch 15 when the inverter 10 starts up, thereby suppressing the inrush current to the capacitor 12 when the inverter 10 starts up using the resistor 14. After the inverter 10 starts up, if the voltage of the smoothing capacitor 12 becomes equal to or higher than a predetermined value, the switch 15 is turned on (closed).

[0023] The inverter control circuit 18 controls the inverter 10 in accordance with an inverter control signal from the controller 32. The inverter control circuit 18 always operates based on the power supplied from the power supply circuit 20. For example, the inverter control circuit 18 operates on DC power generated by the AC / DC converter 17 based on AC power Pe supplied from the power supply circuit 20. The inverter control circuit 18 may also operate on DC power Pd supplied directly from a DC wiring 25 (described later) of the power supply circuit 20.

[0024] The AC / DC converter 17 is a circuit that converts AC power Pe supplied from the power supply circuit 20 into DC power to be supplied to the inverter control circuit 18. The AC voltage Ve of the AC power Pe is, for example, AC 200 volts.

[0025] The brake control circuit 30 controls the brake 6 of the hoist 2. The brake control circuit 30 operates constantly based on the power supplied from the power supply circuit 20. The brake control circuit 30 includes, for example, a controller 32, an AC / DC converter 31, a transformer 33, and a switch 34. Note that the brake control circuit 30 may be configured to switch the voltage or ON / OFF using, for example, a semiconductor switching element.

[0026] The controller 32 executes lift control, which controls the lifting and lowering operation of the car 4 of the elevator 301 using the hoist 2, and braking control, which controls the braking operation of the car 4 using the brake 6. The controller 32 operates based on power supplied from the power supply circuit 20. For example, the controller 32 operates on DC power generated by the AC / DC converter 31 based on AC power Pe supplied from the power supply circuit 20. The controller 32 may also operate on DC power Pd supplied directly from a DC wiring 25 (described later) of the power supply circuit 20.

[0027] The AC / DC converter 31 is a circuit that converts AC power Pe supplied from the power supply circuit 20 into DC power to be supplied to the controller 32 .

[0028] The transformer 33 and the switch 34 are an example of a power generating circuit that generates drive power Pf for the brake 6 based on AC power Pe supplied from the power supply circuit 20. The transformer 33 converts the voltage of the AC power Pe into power to be supplied to the switch 34. The power generating circuit converts the power supplied from the transformer 33 into drive power Pf to be supplied to the brake 6 by opening and closing the switch 34 in accordance with a brake control signal from the controller 32.

[0029] The power supply circuit 20 is connected to be able to supply power to at least the inverter 10, the inverter control circuit 18, and the brake control circuit 30. The power supply circuit 20 includes a DC wiring 25, an AC / DC converter 21, a DC / DC converter 22, and a DC / AC inverter 23. The power supply circuit 20 may be connected to be able to supply power to an external device 35 in addition to the inverter control circuit 18 and the brake control circuit 30. The power supply control circuit 26 is provided inside or outside the power supply circuit 20.

[0030] The DC wiring 25 supplies DC power Pd. A capacitor (not shown) may be connected to the DC wiring 25 to smooth a DC voltage Vd of the DC power Pd.

[0031] The AC / DC converter 21 is a circuit that converts AC power Pa input via an input line 8 into DC power Pd to be supplied to a DC wiring 25. An AC input section of the AC / DC converter 21 is connected to a node 7a on the input line 7 via the input line 8. For example, in the case of a delta connection with a line voltage of AC 200 volts, the input line 8 is connected at node 7a to any two phases (e.g., R phase and S phase) of the three-phase input line 7. Alternatively, in the case of a star connection with a line voltage of AC 400 volts, the input line 8 is connected to any one phase of the three-phase input line 7 and the neutral point. As a result, AC power Pa having an AC voltage Vc lower than the AC voltage Va is supplied to the AC input side of the AC / DC converter 21. The AC voltage Vc is, for example, AC 200 volts.

[0032] The DC / DC converter 22 is a circuit capable of bidirectional voltage conversion between the DC wiring 25 and the battery 24. The DC / DC converter 22 has a function of converting (stepping down) the DC power Pd in ​​the DC wiring 25 into battery power Pb that is supplied to the battery 24 via the battery line 9, and a function of converting (stepping up) the battery power Pb in the battery line 9 into DC power Pd in ​​the DC wiring 25.

[0033] When AC power Pa is being input to the input line 7, the DC / DC converter 22 converts the DC voltage Vd of the DC wiring 25 via the AC / DC converter 21 into a voltage that can be charged into the battery 24, and charges the battery 24. On the other hand, when the input of AC power Pa is stopped, the DC / DC converter 22 converts the battery voltage Vb of the battery 24 into a voltage that can be applied to the DC wiring 25, and supplies DC power Pd to the DC wiring 25. The DC / DC converter 22 is, for example, a step-up / step-down converter.

[0034] Fig. 2 is a diagram showing an example of the configuration of a buck-boost converter. The DC / DC converter 22 shown in Fig. 2 is a buck-boost converter including a capacitor 22a, an inductor 22b, and a low-side switch 22c and a high-side switch 22d, each of which has a diode connected in anti-parallel to a semiconductor switching element such as an IGBT. When AC power Pa is being input, the DC / DC converter 22 steps down a DC voltage Vd in a DC wiring 25, thereby outputting a battery voltage Vb lower than the DC voltage Vd to the battery 24. This charges the battery 24. On the other hand, when the input of AC power Pa is stopped, the DC / DC converter 22 steps up the battery voltage Vb, thereby outputting a DC voltage Vd higher than the battery voltage Vb to the DC wiring 25.

[0035] 1 , the DC / AC inverter 23 is a circuit that converts DC power Pd in ​​the DC wiring 25 into AC power Pe to be supplied to the AC line 27. The AC power Pe is converted into DC power by the AC / DC converter 17 and supplied to the inverter control circuit 18. The AC power Pe is an example of second AC power, and is supplied to the brake control circuit 30 and the external device 35.

[0036] The external device 35 is a load provided outside the elevator control device 101, and operates based on the AC power Pe. The external device 35 is, for example, a device for the car 4 (for example, a controller installed in the car 4, an inverter for the door motor of the car 4, or other external device for rescue in the event of a power outage).

[0037] The switch RY1 is inserted in series into the input line 7 between the nodes 7a and 7b. The switch RY1 switches between connecting and disconnecting the line portion of the input line 7 between the nodes 7a and 7b. The switch RY2 is inserted in series into the battery line 9 between the nodes 9a and 7b. The switch RY2 switches between connecting and disconnecting the line portion of the battery line 9 between the nodes 9a and 7b.

[0038] The power supply control circuit 26 controls the conversion operations of the AC / DC converter 21, the DC / DC converter 22, and the DC / AC inverter 23, and also controls the opening and closing operations of the switches RY1 and RY2.

[0039] Regardless of whether a power outage occurs, power is constantly supplied from the power supply circuit 20 to at least the inverter control circuit 18 and the brake control circuit 30. Note that, in addition to the inverter control circuit 18 and the brake control circuit 30, power may also be constantly supplied from the power supply circuit 20 to the external device 35.

[0040] The power supply control circuit 26 monitors the input of AC power Pa to the input line 7. When a power outage or the like occurs in the commercial power supply 1, the input of AC power Pa to the input line 7 decreases. When the power supply control circuit 26 detects that the input of AC power Pa to the input line 7 has dropped below a predetermined value, it determines that a power outage has occurred and switches the supply source of brake control power for the brake 6 without momentary interruption from the commercial power supply 1 that supplies AC power Pa to the battery 24 that supplies battery power Pb.

[0041] By seamlessly switching the supply source of brake control power for the brake 6 from the commercial power source 1 to the battery 24, even if the input of AC power Pa is stopped, the brake control power is supplied by the battery power Pb supplied from the battery 24. This ensures the power necessary to maintain the brake 6 in a released state, preventing the forced braking and preventing shock to passengers in the car 4. Furthermore, in a power supply circuit that requires a constant power supply to the inverter 10 regardless of whether AC power Pa is being input, the inverter 10 that drives the hoist 2 must be operated using the output of the power supply circuit 20, which presents a problem of increasing the size of the power supply circuit 20. In contrast, according to this embodiment, it is only necessary to provide a power supply circuit 20 that can supply the necessary power to the inverter control circuit 18 and the brake control circuit 30. This enables the power supply circuit 20 (particularly the DC / AC inverter 23, which eliminates the need to supply power to the inverter 10 that drives the hoist 2) and the battery to be made smaller and less expensive. The power supply circuit 20 may also constantly supply power to an external device 35 in addition to the inverter control circuit 18 and the brake control circuit 30.

[0042] The brake control power of the hoist 2 is the power required to control the brake 6, and more specifically, the AC power Pe required for the operation of the brake control circuit 30 and the power required to generate the AC power Pe. The brake control circuit 30 uses the supply source of the brake control power of the hoist 2 as its power source.

[0043] Moreover, the inverter control power is the power required for the operation of the inverter control circuit 18, and the external device power is the power required for the operation of the external device 35.

[0044] In a non-power-failure state in which AC power Pa is being input, switch RY2 is opened and switch RY1 is closed, and power is supplied from commercial power source 1 to inverter 10. As a result, the power supply capacity required of power supply circuit 20 in a non-power-failure state is reduced by the amount of power not being supplied to inverter 10, making it possible to reduce the size and cost of power supply circuit 20.

[0045] Next, an elevator control method by the elevator control device 101 will be described.

[0046] 3 is a timing chart showing an example of a power supply control method when a power outage occurs during regenerative operation of the inverter. Regenerative operation is, for example, an operation in which the car 4 is moved downward when the total weight of the car 4 including passengers is heavier than the counterweight 5, or an operation in which the car 4 is moved upward when the total weight of the car 4 including passengers is lighter than the counterweight 5. When regenerative operation is performed, the hoist 2 acts as a generator, generating regenerative power that is supplied from the hoist 2 to the inverter 10.

[0047] When the input of AC power Pa drops and power outage is detected at time t0, the power supply control circuit 26 switches the power conversion direction of the DC / DC converter 22 from the power conversion direction from the DC wiring 25 to the battery 24 to the power conversion direction from the battery 24 to the DC wiring 25. This switches the operation of the DC / DC converter 22 from a step-down operation to a step-up operation, so that the power supply circuit 20 can continuously supply AC power Pe generated based on the battery power Pb to the brake control circuit 30. This suppresses the activation of forced braking due to interruption of the brake control power, and reduces the impact on passengers in the car 4.

[0048] If a power outage occurs during regenerative operation, the power supply for the inverter 10 is provided by the regenerative energy from the hoist 2. The inverter control circuit 18 continues the regenerative operation of the inverter 10. The inverter 10 uses this regenerative energy to perform a power outage rescue operation, driving the hoist 2 until the car 4 is moved to a destination position such as a destination floor.

[0049] Due to the regenerative operation of the inverter 10, the moving speed (car speed) of the car 4 gradually decreases toward zero. When the controller 32 detects at time t1 that the moving speed of the car 4 has decreased to a predetermined speed or below (for example, zero or a speed slightly faster than zero), it switches the brake 6 from released to engaged. By engaging the brake 6, the car 4 is stopped by the brake 6. Since the brake 6 is activated when the moving speed of the car 4 has decreased to a predetermined speed or below, the impact on passengers inside the car 4 is reduced. The controller 32 switches the brake 6 from released to engaged, for example, by cutting off the power supply from the brake control circuit 30 to the brake 6 by turning off the switch 34.

[0050] With the brake 6 switched from released to engaged, the power supply control circuit 26 switches the power supply of the inverter 10 to the battery 24 at time t2. As a result, from time t2 onwards, the inverter 10 can drive the hoist 2 using the power supplied from the battery 24. The power supply control circuit 26 can detect, based on a signal from the controller 32, that the brake 6 has been switched from released to engaged.

[0051] The power supply control circuit 26 switches the switch RY2 from open to closed at time t2, so that the battery power Pb supplied from the battery 24 is input to the converter circuit 11 of the inverter 10. Since the battery 24 is connected to the AC input side of the converter circuit 11 of the inverter 10, the power supply of the inverter 10 is switched to the battery 24.

[0052] The power supply control circuit 26 switches the switch RY1 from closed to open at time t2 to cut off the input line 7 of the AC power Pa to the inverter 10. This prevents the battery power Pb supplied from the battery 24 from flowing out to the commercial power supply 1 side.

[0053] The controller 32 releases the brake 6 again after time t2 when the power supply of the inverter 10 is switched to the battery 24. This allows the car 4 to move. If the position of the car 4 deviates from the target position, the controller 32 transmits a control command to the inverter control circuit 18 to fine-tune the position of the car 4 to the target position. In accordance with the control command, the inverter control circuit 18 outputs a drive command for the inverter 10 to the inverter 10. In accordance with the drive command, the inverter 10 drives the hoist 2 to move the car 4 to the target position.

[0054] 4 is a timing chart showing an example of a power supply control method when a power outage occurs during power running of the inverter. Power running is, for example, an operation in which the car 4 is moved upward when the total weight of the car 4 including passengers is heavier than the counterweight 5, or an operation in which the car 4 is moved downward when the total weight of the car 4 including passengers is lighter than the counterweight 5. When power running is performed, the hoist 2 functions as an electric motor, and therefore driving power Pc is supplied to the hoist 2 from the inverter 10.

[0055] When the input of AC power Pa drops and power outage is detected at time t0, the power supply control circuit 26 switches the power conversion direction of the DC / DC converter 22 from the power conversion direction from the DC wiring 25 to the battery 24 to the power conversion direction from the battery 24 to the DC wiring 25. This switches the operation of the DC / DC converter 22 from a step-down operation to a step-up operation, so that the power supply circuit 20 can continuously supply AC power Pe generated based on the battery power Pb to the brake control circuit 30. This prevents forced braking due to a disruption of the brake control power, and reduces the impact on passengers in the car 4.

[0056] When the power supply control circuit 26 detects a stoppage of the input of AC power Pa at time t0, it transmits power outage information indicating the stoppage of the input of AC power Pa to the inverter control circuit 18. When the inverter control circuit 18 receives the power outage information while the inverter 10 is in powering operation, it instantly switches the inverter 10 from powering operation to regenerative operation. As a result, the power supply for the inverter 10 is provided by regenerative energy from the hoist 2. The inverter control circuit 18 continues the regenerative operation of the inverter 10. The regenerative operation of the inverter 10 causes the car 4 to decelerate.

[0057] Due to the regenerative operation of the inverter 10, the moving speed (car speed) of the car 4 gradually decreases toward zero. The control content from time t1 to time t2 is the same as in the case of Figure 3, so the above explanation will be used and the explanation will be omitted.

[0058] The controller 32 releases the brake 6 again at time t3, which is after time t2 when the power source of the inverter 10 is switched to the battery 24. This allows the car 4 to move. The controller 32 commands the inverter control circuit 18 to perform a power outage rescue operation to move the car 4 to a destination position, such as a destination floor. The inverter control circuit 18 outputs a drive command for the inverter 10 to the inverter 10 in accordance with the control command for the power outage rescue operation. The inverter 10 uses battery power Pb from the battery 24 to perform a power outage rescue operation to drive the hoist 2 until the car 4 is moved to a destination position, such as a destination floor. Time t3 may be the same as time t2.

[0059] 5 is a diagram showing a configuration example of an elevator according to the second embodiment. In the second embodiment, the description of the configuration, actions, and effects similar to those of the first embodiment will be omitted by citing the above description.

[0060] An elevator 302 according to the second embodiment includes an elevator control panel 202. The elevator control panel 202 includes a battery 24 and an elevator control device 102. The elevator control device 102 according to the second embodiment differs from the elevator control device 101 according to the first embodiment in that it includes a first diode 28 instead of the switch RY2.

[0061] The power supply circuit 20 according to the second embodiment includes a first diode 28 having an anode electrically connected to the battery 24 and a cathode electrically connected to the DC link 16. The DC link 16 is electrically connected to the commercial power supply 1 and the battery 24 by a diode-OR connection of the converter circuit 11 and the first diode 28. As a result, when a power outage occurs and the voltage of the battery 24 becomes higher than the voltage of the capacitor 12, the power supply of the inverter 10 is automatically switched to the battery 24. Since the switch RY2 is omitted, the elevator control device 101 can be made smaller and the number of parts can be reduced.

[0062] 6 is a diagram showing a configuration example of an elevator according to the third embodiment. In the third embodiment, the description of the configuration, actions, and effects similar to those of the first embodiment will be omitted by citing the above description.

[0063] An elevator 303 according to the third embodiment includes an elevator control panel 203. The elevator control panel 203 includes a battery 24 and an elevator control device 103. The elevator control device 103 according to the third embodiment differs from the elevator control device 101 according to the first embodiment in that a switch RY2 is inserted in series in the current path between the DC wiring 25 and the node 7b.

[0064] When the power supply control circuit 26 detects a stop in the input of AC power Pa, it switches the switch RY2 from open to closed. When the switch RY2 is closed, the DC wiring 25 is connected to the AC input side of the inverter 10, and a DC voltage Vd higher than the battery voltage Vb is input to the AC input side of the converter circuit 11 of the inverter 10. As a result, the power supply voltage input to the inverter 10 during a power outage becomes higher than the battery voltage Vb, enabling the hoist 2 to rotate at high speed during a power outage and the car 4 to move at high speed during a power outage.

[0065] 7 is a diagram showing a configuration example of an elevator according to the fourth embodiment. In the fourth embodiment, the description of the configuration, actions, and effects similar to those of the first embodiment will be omitted by citing the above description.

[0066] An elevator 304 according to the fourth embodiment includes an elevator control panel 204. The elevator control panel 204 includes a battery 24 and an elevator control device 104. The elevator control device 104 according to the fourth embodiment differs from the elevator control device 103 according to the third embodiment in that it includes a second diode 29 instead of the switch RY2.

[0067] The power supply circuit 20 according to the fourth embodiment includes a second diode 29 having an anode electrically connected to the DC wiring 25 and a cathode electrically connected to the DC link 16. The DC link 16 is electrically connected to the commercial power supply 1 and the DC wiring 25 through a diode-OR connection between the converter circuit 11 and the second diode 29. As a result, when the input of AC power Pa is stopped, the power supply of the inverter 10 is automatically switched to the DC wiring 25. Eliminating the switch RY2 enables the elevator control device 104 to be miniaturized and the number of components reduced. Furthermore, when the input of AC power Pa is stopped, a DC voltage Vd higher than the battery voltage Vb is input to the DC link 16 of the inverter 10. As a result, the power supply voltage input to the inverter 10 during a power outage becomes higher than the battery voltage Vb, enabling high-speed rotation of the hoist 2 and high-speed movement of the car 4 during a power outage.

[0068] Although the embodiments have been described above, they are presented as examples and the present invention is not limited to the above embodiments. The above embodiments can be implemented in various other forms, and various combinations, omissions, substitutions, modifications, etc. can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as set forth in the claims.

[0069] In this embodiment, the controller or control circuit is an electronic circuit such as a CPU (Central Processing Unit), FPGA (Field Programmable Gate Array), or ASIC (Application Specific Integrated Circuit). The controller or control circuit may be a computer having a memory and a processor. The controller or control circuit executes the various control operations described in this specification by executing a program such as instruction code stored in the memory, or by being a circuit designed for a specific application. [Explanation of symbols]

[0070] 1 Commercial power supply 2. Windlass 3. Rope 4 Car 5 Counterweight 6. Brakes 7,8 Input lines 7a, 7b, 9a nodes 9 Battery Lines 10 Inverter 11 Converter circuit 12 Capacitors 13 Inverter circuit 14 Resistance 15 Switchgear 16 DC Link 17 AC / DC converter 18 Inverter control circuit 20 Power circuit 21 AC / DC converter 22 DC / DC converter 23 DC / AC inverter 24 Battery 25 DC wiring 26 Power supply control circuit 27 AC line 28 First diode 29 Second diode 30 Brake control circuit 31 AC / DC converter 32 Controller 33 Transformer 34 Switch 35 External equipment 101, 102, 103, 104 Elevator control device 201, 202, 203, 204 Elevator control panel 301, 302, 303, 304 Elevator RY1,RY2 switch

Claims

1. an inverter that converts input AC power into power for driving a hoist that raises and lowers the elevator car; a power supply circuit that switches from the AC power to a battery when the input of the AC power is stopped; a brake for stopping the car; an elevator control device that constantly supplies power for controlling the brake from the power supply circuit;

2. an inverter control circuit for controlling the inverter; 2. The elevator control device according to claim 1, wherein power for the inverter control circuit is constantly supplied from the power supply circuit.

3. 3. The elevator control device according to claim 2, wherein when the input of the AC power is stopped during regenerative operation, the inverter control circuit performs deceleration control of the car using regenerative power, and switches the brake from released to engaged when the moving speed of the car decreases to a predetermined speed.

4. 3. The elevator control device according to claim 2, wherein when the input of the AC power is stopped during powering operation, the inverter control circuit switches the inverter from powering operation to regenerative operation, performs deceleration control of the car using the regenerative power, and switches the brake from released to engaged when the moving speed of the car decreases to a predetermined speed.

5. 5. The elevator control device according to claim 4, wherein after the brake is applied, power is supplied from the battery to the inverter to move the car to a target position.

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