Elevator control device

Abstract

The present invention provides an elevator control device, comprising: an inverter for converting input AC power into power for driving a hoist for raising and lowering an elevator car; a power supply circuit that switches from the AC power to a battery when the input of the AC power is stopped; and a brake for stopping the car, in which the power for controlling the brake is continuously supplied from the power supply circuit. According to the present invention, it is possible to mitigate shock during power failure and to reduce the size of a power supply circuit such as an uninterruptible power supply device.

Description

Technical Field

[0001] The invention relates to an elevator control device. Background Art

[0002] There is known a technique for continuing the operation of an elevator using electric power supplied from a battery when a power outage occurs (for example, see Patent Documents 1 and 2).

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2015-110463

[0004] Patent Document 2: Japanese Patent Application Laid-Open No. 2017-171414 Summary of the Invention

[0005] [Problems to be Solved by the Invention]

[0006] If the AC power (commercial power) supplying the elevator control device is lost due to a power outage or other reasons, the power supply to the brake itself and the brake control device that controls the brake will be lost, causing forced braking, which may increase the impact on car occupants. In addition, the power supply to the inverter that drives the elevator hoist will also be lost, which may cause the elevator to be out of control.

[0007] To address this issue, power supply circuits, such as uninterruptible power supplies (UPSs) with batteries, have been installed in recent years to support elevator control system operation during power outages. Typically, AC power (commercial power) is used to power the inverter, brake control system, and other components. If a power outage is detected, power is switched from the commercial power supply to the UPS battery. In this case, the switch from AC power to the UPS causes a momentary power outage, resulting in a loss of power to the brakes and brake control system, forcing the brakes to apply, potentially inflicting a significant impact on the car occupants.

[0008] On the other hand, to mitigate the impact on passengers, one possible approach is to always supply power to the elevator control device from an uninterruptible power supply, regardless of whether a power outage occurs or not. In the event of a power outage, the AC power supply is continuously switched to a battery. However, if the uninterruptible power supply always supplies power to the elevator control device, power is also always supplied to the inverter that drives the hoist. This may increase the size of the power supply circuitry for the uninterruptible power supply, leading to increased costs.

[0009] The present invention aims to alleviate the impact during a power outage and to miniaturize a power supply circuit such as an uninterruptible power supply.

[0010] [Methods used to solve the problem]

[0011] In one aspect, the present invention provides an elevator control device, comprising:

[0012] an inverter that converts input AC power into power for driving a hoist for raising and lowering the elevator car;

[0013] a power supply circuit that switches from the AC power to a battery when input of the AC power stops; and

[0014] a brake for stopping the car,

[0015] Here, the power for controlling the brake is continuously supplied from the power supply circuit.

[0016] [Effects of the Invention]

[0017] According to the present invention, it is possible to alleviate the impact during a power outage and to downsize the power supply circuit of an uninterruptible power supply device or the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a diagram showing a structural example of an elevator according to the first embodiment.

[0019] Figure 2 This is a diagram showing a configuration example of a buck-boost converter.

[0020] Figure 3 This is a timing chart showing an example of a power supply control method when a power outage occurs during regenerative operation of the inverter.

[0021] Figure 4 This is a timing chart showing an example of a power supply control method when a power outage occurs during the powerful operation of the inverter.

[0022] Figure 5 It is a diagram showing a structural example of an elevator according to the second embodiment.

[0023] Figure 6 It is a diagram showing a structural example of an elevator according to the third embodiment.

[0024] Figure 7 It is a diagram showing a structural example of an elevator according to the fourth embodiment.

[0025] Description of Reference Numerals

[0026] 1 Commercial power supply

[0027] 2 winches

[0028] 3 Ropes

[0029] 4 Cars

[0030] 5. Counterweight

[0031] 6 Brakes

[0032] 7, 8 Input lines

[0033] Nodes 7a, 7b, and 9a

[0034] 9 Battery circuit

[0035] 10 Inverter

[0036] 11 Converter Circuit

[0037] 12 Capacitors

[0038] 13 Inverter Circuit

[0039] 14 resistors

[0040] 15 Switch

[0041] 16 DC link

[0042] 17 AC / DC converter

[0043] 18 Inverter control circuit

[0044] 20 Power circuit

[0045] 21 AC / DC converter

[0046] 22 DC / DC converters

[0047] 23 DC / AC inverter

[0048] 24 batteries

[0049] 25 DC wiring

[0050] 26 Power supply control circuit

[0051] 27 AC lines

[0052] 28 First diode

[0053] 29 Second diode

[0054] 30 Brake control circuit

[0055] 31 AC / DC converter

[0056] 32 Controller

[0057] 33 Transformer

[0058] 34 switches

[0059] 35 External devices

[0060] 101, 102, 103, 104 elevator control devices

[0061] Elevator control panels 201, 202, 203, and 204

[0062] Elevators 301, 302, 303, and 304

[0063] RY1, RY2 switches DETAILED DESCRIPTION

[0064] Hereinafter, embodiments of the present invention will be described.

[0065] Figure 1 1 is a diagram showing a structural example of an elevator according to the first embodiment. Figure 1 In the illustrated elevator 301, a car 4 and a counterweight 5 are suspended at both ends of a rope 3 wound around the rotating shaft of a hoist 2 (motor). The car 4 is raised and lowered in a cantilevered manner in the opposite direction of the counterweight 5 via the rope 3 as the hoist 2 rotates. The drive control of the hoist 2 and other functions are performed by an elevator control device 101. The elevator control device 101 is located, for example, within an elevator control panel 201 in a machine room or the like of a building where the elevator 301 is installed.

[0066] Elevator 301 operates using 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, if commercial power source 1 fails, the power supply from commercial power source 1 ceases. Therefore, to ensure continued operation of elevator 301 during a commercial power source 1 failure, a power supply circuit 20 connected to a battery 24 is provided. Note that power supply circuit 20 is, for example, an uninterruptible power supply (UPS).

[0067] 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 external equipment 35. The elevator control panel 201 includes a battery 24 and an elevator control device 101. The brake 6 is a mechanical electromagnetic brake that, for example, stops the movement of the car 4 by contacting a brake shoe with a brake drum. Furthermore, the brake 6 is configured to apply the brakes when power is lost. The brake 6 may also be a component of the elevator control device 101.

[0068] The battery 24 is connected to the elevator control device 101. The battery 24 is provided outside the elevator control device 101, but may be provided inside the elevator control device 101.

[0069] The elevator control device 101 is a device that controls the elevator 301 . The elevator control device 101 has a lifting control function for controlling the lifting and lowering operation of the car 4 of the elevator 301 via the hoist 2 , and a braking control function for controlling the braking operation of the car 4 via the brake 6 .

[0070] 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 .

[0071] The inverter 10 is a circuit that converts AC power Pa input from the commercial power supply 1 via the input line 7 into power for driving the hoisting machine 2 that raises and lowers the car 4. The inverter 10 drives the hoisting machine 2 in response to a drive command from the inverter control circuit 18. The inverter 10 supplies the hoisting machine 2 with the power Pc required to drive the hoisting machine 2.

[0072] The inverter 10 includes, for example, a converter circuit 11 , an inverter circuit 13 , and a DC link 16 .

[0073] The converter circuit 11 converts AC power Pa input from the commercial power supply 1 via the input line 7 into DC power, which is supplied to the DC link 16. The AC power 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, for example, a circuit that converts the AC power Pa into DC power using multiple transistors.

[0074] The inverter circuit 13 converts the DC power in the DC link 16 into power Pc, which is supplied to the hoist 2. Power Pc is, for example, three-phase AC power. The inverter circuit 13 converts the DC power in the DC link 16 into power Pc having a target frequency and voltage, for example, based on a drive command generated by pulse width modulation control from the inverter control circuit 18.

[0075] A 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 power voltage in the DC link 16 is smoothed by the capacitor 12. The DC link 16 may include an inrush current suppression circuit comprising a resistor 14 and a switch 15. The inrush current suppression circuit disconnects (opens) the switch 15 when the inverter 10 starts, thereby suppressing the inrush current entering the capacitor 12 during startup of the inverter 10 using the resistor 14. After the inverter 10 starts, if the voltage of the smoothing capacitor 12 reaches a specified value or higher, the switch 15 is turned on (closed).

[0076] The inverter control circuit 18 controls the inverter 10 based on an inverter control signal from the controller 32. The inverter control circuit 18 generally operates based on the power supplied from the power supply circuit 20. For example, the inverter control circuit 18 operates using DC power generated by the AC / DC converter 17 based on the AC power Pe supplied from the power supply circuit 20. The inverter control circuit 18 may also operate using DC power Pd supplied directly from a DC line 25 of the power supply circuit 20, which will be described later.

[0077] The AC / DC converter 17 is a circuit that converts the AC power Pe supplied from the power supply circuit 20 into DC power supplied to the inverter control circuit 18. The AC voltage Ve of the AC power Pe is, for example, AC 200 volts.

[0078] The brake control circuit 30 controls the brake 6 of the hoist 2. The brake control circuit 30 generally operates 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. It should be noted that the brake control circuit 30 may also switch voltage and ON / OFF using, for example, a semiconductor switching element.

[0079] The controller 32 performs lifting control, which controls the lifting and lowering of the car 4 of the elevator 301 via the hoist 2, and braking control, which controls the braking of the car 4 via the brake 6. The controller 32 operates based on the power supplied from the power supply circuit 20. For example, the controller 32 operates using DC power generated by the AC / DC converter 31 based on the AC power Pe supplied from the power supply circuit 20. The controller 32 may also operate using DC power Pd supplied directly from the DC wiring 25 of the power supply circuit 20, which will be described later.

[0080] The AC / DC converter 31 is a circuit that converts the AC power Pe supplied from the power supply circuit 20 into DC power supplied to the controller 32 .

[0081] The transformer 33 and the switch 34 are an example of a power generation circuit that generates the driving power Pf for the brake 6 based on the AC power Pe supplied from the power supply circuit 20. The transformer 33 converts the voltage of the AC power Pe into the power supplied to the switch 34. The power generation circuit switches the switch 34 on and off in response to a brake control signal from the controller 32, thereby converting the power supplied from the transformer 33 into the driving power Pf supplied to the brake 6.

[0082] The power supply circuit 20 is connected to at least the inverter 10, the inverter control circuit 18, and the brake control circuit 30 in a manner capable of supplying power. 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. In addition to the inverter control circuit 18 and the brake control circuit 30, the power supply circuit 20 may also be connected to an external device 35 in a manner capable of supplying power. The power supply control circuit 26 is provided inside or outside the power supply circuit 20.

[0083] The DC line 25 supplies the DC power Pd. A capacitor (not shown) for smoothing the DC power voltage Vd of the DC power Pd may be connected to the DC line 25 .

[0084] AC / DC converter 21 is a circuit that converts AC power Pa input via input line 8 into DC power Pd, which is supplied to DC wiring 25. The AC input portion of AC / DC converter 21 is connected to node 7a on input line 7 via input line 8. For example, in a delta-connected configuration with a line voltage of 200 volts AC, input line 8 is connected to any two phases (e.g., R and S phases) of the three-phase input line 7 at node 7a. Alternatively, in a star-connected configuration with a line voltage of 400 volts AC, input line 8 is connected to the neutral point of any one phase of the three-phase input line 7. Therefore, AC power Pa having an AC voltage Vc lower than AC power voltage Va is supplied to the AC input side of AC / DC converter 21. AC power voltage Vc is, for example, 200 volts AC.

[0085] The DC / DC converter 22 is a circuit capable of bidirectional voltage conversion between the DC line 25 and the battery 24. The DC / DC converter 22 has the function of power-converting (stepping down) the DC power Pd in ​​the DC line 25 into battery power Pb, which is supplied to the battery 24 via the battery line 9, and the function of power-converting (stepping up) the battery power Pb in the battery line 9 into DC power Pd in ​​the DC line 25.

[0086] When AC power Pa is input to input line 7, DC / DC converter 22 converts DC power voltage Vd of DC line 25 via AC / DC converter 21 into a voltage capable of charging battery 24, thereby charging battery 24. On the other hand, when the input of AC power Pa stops, DC / DC converter 22 converts battery voltage Vb of battery 24 into a voltage capable of being applied to DC line 25, thereby supplying DC power Pd to DC line 25. DC / DC converter 22 is, for example, a buck-boost converter.

[0087] Figure 2 This is a diagram showing a configuration example of a buck-boost converter. Figure 2The DC / DC converter 22 shown is a step-up / step-down converter comprising a capacitor 22a, an inductor 22b, and a low-side switch 22c and a high-side switch 22d, each consisting of a diode connected in antiparallel to a semiconductor switching element such as an IGBT. When AC power Pa is input, the DC / DC converter 22 steps down the DC power voltage Vd on the DC line 25, outputting a battery voltage Vb, which is lower than DC power voltage Vd, to the battery 24. This charges the battery 24. On the other hand, when the input of AC power Pa stops, the DC / DC converter 22 steps up the battery voltage Vb, outputting a DC power voltage Vd, which is higher than battery voltage Vb, to the DC line 25.

[0088] exist Figure 1 In the embodiment, the DC / AC inverter 23 is a circuit that converts DC power Pd in ​​the DC line 25 into AC power Pe, which is 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 the second AC power and is supplied to the brake control circuit 30 and the external device 35.

[0089] The external device 35 is a load installed outside the elevator control device 101 and operates according to 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, and other external devices used for rescue during power outages).

[0090] Switch RY1 is inserted in series with input line 7 between nodes 7a and 7b. Switch RY1 switches whether to disconnect or connect the line portion between nodes 7a and 7b in input line 7. Switch RY2 is inserted in series with battery line 9 between nodes 9a and 7b. Switch RY2 switches whether to disconnect or connect the line portion between nodes 9a and 7b in battery line 9.

[0091] 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 controls the opening and closing operations of the switches RY1 and RY2 .

[0092] Regardless of whether a power outage occurs, power is continuously supplied from the power supply circuit 20 to at least the inverter control circuit 18 and the brake control circuit 30. Note that the power supply circuit 20 can also continuously supply power to external devices 35 in addition to the inverter control circuit 18 and the brake control circuit 30.

[0093] The power supply control circuit 26 monitors the input of AC power Pa to the input line 7. When a power outage occurs in the commercial power supply 1, for example, 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 fallen below a specified value, it determines that a power outage has occurred and seamlessly switches the source of brake control power for the brake 6 from the commercial power supply 1, which supplies AC power Pa, to the battery 24, which supplies battery power Pb.

[0094] By seamlessly switching the source of brake control power for brake 6 from commercial power supply 1 to battery 24, brake control power can be supplied by battery power Pb supplied from battery 24 even if the input of AC power Pa is stopped. Therefore, since the power required to maintain the release state of brake 6 is ensured, there is no forced braking operation, and no impact on passengers in car 4 occurs. Furthermore, in the case of a power supply circuit that continuously supplies power to inverter 10 regardless of the input of AC power Pa, the output of power supply circuit 20 must be used to drive inverter 10 of hoisting machine 2, resulting in an increase in the size of power supply circuit 20. In contrast, according to this embodiment, only power supply circuit 20 is required to supply the necessary power to inverter control circuit 18 and brake control circuit 30. Consequently, the power supply circuit 20 (particularly, the DC / AC inverter 23 that supplies power to inverter 10 driving hoisting machine 2) and the battery can be miniaturized and reduced in cost. It should be noted that, in addition to the inverter control circuit 18 and the brake control circuit 30 , the power supply circuit 20 may also continuously supply power to the external device 35 .

[0095] The brake control power for the hoisting machine 2 is the power required to control the brake 6. More specifically, it refers to the AC power Pe required to operate the brake control circuit 30 and the power required to generate the AC power Pe. The brake control circuit 30 uses the source of the brake control power for the hoisting machine 2 as its power source.

[0096] Note that the inverter control power refers to the power required for the operation of the inverter control circuit 18 , and the external device power refers to the power required for the operation of the external device 35 .

[0097] In a non-power-out state with AC power Pa input, switch RY2 is opened and switch RY1 is closed to supply power from commercial power supply 1 to inverter 10. Therefore, the power supply capacity required by power supply circuit 20 in a non-power-out state can be reduced by the amount of power not required to be supplied to inverter 10, thereby enabling miniaturization and cost reduction of power supply circuit 20.

[0098] Next, the elevator control method by the elevator control device 101 will be described.

[0099] Figure 3 This is a timing diagram illustrating an example of a power supply control method for the event of a power outage during regenerative operation of the inverter. Regenerative operation involves, for example, moving the car 4 downward while the total weight of the car 4, including passengers, is heavier than the counterweight 5, or moving the car 4 upward while the total weight of the car 4, including passengers, is lighter than the counterweight 5. During regenerative operation, the hoist 2 operates as a generator, generating regenerative power that is supplied from the hoist 2 to the inverter 10.

[0100] When the input of AC power Pa decreases and a 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 DC line 25 to the battery 24 to the battery 24 to the DC line 25. Thus, since the operation of the DC / DC converter 22 switches from step-down to step-up, the power supply circuit 20 can continuously supply the AC power Pe generated based on the battery power Pb to the brake control circuit 30. This prevents forced braking due to an interruption in the brake control power, thereby mitigating the impact on the occupants of the car 4.

[0101] If a power outage occurs during regenerative operation, the inverter 10 is powered by regenerative energy from the hoist 2. The inverter control circuit 18 continues the regenerative operation of the inverter 10. The inverter 10 utilizes this regenerative energy to drive the hoist 2 until the car 4 reaches the target location, such as the target floor, in a power outage rescue operation.

[0102] Through the regenerative operation of the inverter 10, the moving speed of the car 4 (car speed) gradually decreases toward zero. When the controller 32 detects at time t1 that the moving speed of the car 4 has dropped below a predetermined prescribed speed (for example, zero or a speed slightly faster than zero), the brake 6 is switched from being released to being fastened. When the brake 6 is fastened, the car 4 is stopped by the brake 6. Since the brake 6 is operated in a state where the moving speed of the car 4 has dropped below the prescribed speed, the impact on the occupants in the car 4 is mitigated. The controller 32 switches the brake 6 from being released to being fastened, for example, by shutting off the switch 34 to cut off the power supply from the brake control circuit 30 to the brake 6.

[0103] When the brake 6 switches from released to engaged, the power control circuit 26 switches the power supply of the inverter 10 to the battery 24 at time t2. Therefore, after time t2, the inverter 10 can drive the hoist 2 using the power supplied by the battery 24. Based on a signal from the controller 32, the power control circuit 26 can detect that the brake 6 has switched from released to engaged.

[0104] At time t2, the power supply control circuit 26 switches the switch RY2 from open to closed, 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.

[0105] At time t2, the power supply control circuit 26 switches the switch RY1 from closed to open, thereby disconnecting the input line 7 for inputting 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.

[0106] After time t2, when the power supply to the inverter 10 is switched to the battery 24, the controller 32 releases the brake 6. This allows the car 4 to move. If the position of the car 4 deviates from the target position, the controller 32 sends a control command to the inverter control circuit 18 to fine-tune the position of the car 4 to the target position. The inverter control circuit 18 outputs a drive command to the inverter 10 based on the control command. The inverter 10 drives the hoist 2 based on the drive command to move the car 4 to the target position.

[0107] Figure 4 This is a timing diagram illustrating an example of a power supply control method when a power outage occurs during a boost operation of the inverter. For example, boost operation involves moving the car 4 upward while the total weight of the car 4, including passengers, is heavier than the counterweight 5, or moving the car 4 downward while the total weight of the car 4, including passengers, is lighter than the counterweight 5. During boost operation, the hoist 2 operates as a motor, so drive power Pc is supplied to the hoist 2 from the inverter 10.

[0108] When a power outage caused by a decrease in the input of AC power Pa is detected at time t0, the power supply control circuit 26 switches the power conversion direction of the DC / DC converter 22 from the DC line 25 to the battery 24 to the battery 24 to the DC line 25. Thus, since the operation of the DC / DC converter 22 switches from step-down to step-up, the power supply circuit 20 can continuously supply the AC power Pe generated based on the battery power Pb to the brake control circuit 30. This prevents forced braking due to an interruption in the brake control power, thereby mitigating the impact on the occupants of the car 4.

[0109] When the power supply control circuit 26 detects the cessation of the input of AC power Pa at time t0, it transmits a power outage message to the inverter control circuit 18 indicating the cessation of the input of AC power Pa. If the power outage message is received while the inverter 10 is in full-power operation, the inverter control circuit 18 instantly switches the inverter 10 from full-power operation to regenerative operation. Thus, the inverter 10 is powered 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 decelerates the car 4.

[0110] The moving speed of the car 4 (car speed) gradually decreases toward zero through the regenerative operation of the inverter 10. The control content from time t1 to time t2 is the same as Figure 3 The situation is the same as that of , so its description is omitted by citing the above description.

[0111] At time t3, after time t2 at which the power supply of the inverter 10 is switched to the battery 24, the controller 32 releases the brake 6 again. This allows the car 4 to move. The controller 32 instructs the inverter control circuit 18 to perform a power outage rescue operation to move the car 4 to a target location, such as a target floor. Based on the control instruction for the power outage rescue operation, the inverter control circuit 18 outputs a drive instruction for the inverter 10 to the inverter 10. The inverter 10 utilizes 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 target location, such as a target floor. Time t3 may be the same as time t2.

[0112] Figure 5 1 is a diagram showing an example of a structure of an elevator according to a second embodiment. In the second embodiment, the above description is cited and the description of the same structure, function and effect as in the first embodiment is omitted.

[0113] The elevator 302 of 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 of the second embodiment differs from the elevator control device 101 of the first embodiment in that a first diode 28 is provided instead of the switch RY2.

[0114] 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 via a diode-or connection formed by the converter circuit 11 and the first diode 28. Consequently, 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. By eliminating the switch RY2, the elevator control device 101 can be miniaturized and the number of components can be reduced.

[0115] Figure 6 1 is a diagram showing an example of a structure of an elevator according to Embodiment 3. In the third embodiment, the above description is cited, and description of the same structure, operation, and effect as in the first embodiment is omitted.

[0116] The 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 of the third embodiment differs from the elevator control device 101 of the first embodiment in that a switch RY2 is inserted in series in the current path between the DC line 25 and the node 7b.

[0117] When the power supply control circuit 26 detects that the input of AC power Pa has ceased, it switches the switch RY2 from open to closed. When the switch RY2 is closed, since the DC line 25 is connected to the AC input side of the inverter 10, a DC power voltage Vd higher than the battery voltage Vb is input to the AC input side of the converter circuit 11 of the inverter 10. Therefore, since the power supply voltage input during a power outage to the inverter 10 is higher than the battery voltage Vb, high-speed rotation of the hoist 2 and high-speed travel of the car 4 are possible during a power outage.

[0118] Figure 7 1 is a diagram showing an example of a structure of an elevator according to Embodiment 4. In the fourth embodiment, the above description is cited, and description of the same structure, operation, and effect as in the first embodiment is omitted.

[0119] The elevator 304 of 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 of the fourth embodiment differs from the elevator control device 103 of the third embodiment in that a second diode 29 is provided instead of the switch RY2.

[0120] The power supply circuit 20 according to the fourth embodiment includes a second diode 29, the anode of which is electrically connected to the DC line 25, and the cathode of which is electrically connected to the DC link 16. The DC link 16 is electrically connected to the commercial power supply 1 and the DC line 25 via a diode or connection formed by the converter circuit 11 and the second diode 29. Consequently, when the input of AC power Pa stops, the power supply of the inverter 10 automatically switches to the DC line 25. By eliminating the switch RY2, the elevator control device 104 can be miniaturized and the number of components reduced. Furthermore, when the input of AC power Pa stops, a DC power voltage Vd higher than the battery voltage Vb is input to the DC link 16 of the inverter 10. Therefore, since the power supply voltage input to the inverter 10 becomes higher than the battery voltage Vb during a power outage, high-speed rotation of the hoist 2 and high-speed movement of the car 4 are possible during a power outage.

[0121] As described above, the embodiments have been described. However, the embodiments are presented as examples and do not limit the present invention. The embodiments can be implemented in various other ways, and various combinations, omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and gist of the invention and are included in the scope equivalent to the invention described in the claims.

[0122] In this embodiment, the controller or control circuit is an electronic circuit such as a CPU (central processing unit), an FPGA (field programmable gate array), or an ASIC (application-specific integrated circuit). The controller or control circuit can be a computer having a memory and a processor. The controller or control circuit performs the various control actions described in this application specification by executing a program such as command code stored in the memory or by using circuits designed for special purposes.

Claims

1. An elevator control device, comprising: an inverter that converts input AC power into power for driving a hoist for raising and lowering the elevator car; a power supply circuit that switches from the AC power to a battery when input of the AC power stops; as well as a brake for stopping the car, Here, the power for controlling the brake is continuously supplied from the power supply circuit.

2. The elevator control device according to claim 1, comprising: an inverter control circuit, which controls the inverter, The power supply circuit continuously supplies power to the inverter control circuit.

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

4. The elevator control device according to claim 2, wherein: When the input of the AC power stops during strong operation, the inverter control circuit switches the inverter from strong operation to regenerative operation, and uses regenerative power to control the deceleration of the car. If the moving speed of the car drops to a pre-set specified speed, the brake is switched from released to tightened.

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

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