Power supply control device for passenger conveyor

Abstract

A power supply control device for a passenger conveyor, which can suppress the device from being large-sized. It is provided with: a charging circuit (14) which pre-charges a smoothing capacitor (3) of a power conversion circuit (10) having a converter (2), the smoothing capacitor (3), and an inverter (4); an electricity storage section (15) which is connected to the charging circuit (14); and an inverter control section (11) which controls the inverter (4). The charging circuit (14) pre-charges the smoothing capacitor (3) in a case where a standby mode is set, and charges the electricity storage section (15) using power supplied from a main power source (1) in a case where a drive mode is set. The inverter control section (11) switches a power supply source from the main power source (1) to the electricity storage section (15) in a case where power supply from the main power source (1) is cut off, and controls the inverter (4) to decelerate and stop a motor (108).

Description

Technical Field

[0001] This invention relates to a power supply control device for passenger conveyors. Background Technology

[0002] Existing emergency operation devices for passenger conveyors include a charge / discharge control unit, an energy storage unit, and an inverter control unit. The charge / discharge control unit controls the energy storage unit to charge it during normal operation and discharge it during power outages. The inverter control unit controls the inverter to drive the motor during power outages by utilizing the discharge from the energy storage unit. Furthermore, the inverter control unit controls the inverter to reduce the motor speed and stop the passenger conveyor when the remaining capacity of the energy storage unit decreases (e.g., Patent Document 1).

[0003] Existing technical documents

[0004] Patent Document 1: Japanese Patent Application Publication No. 2006-182456 Summary of the Invention

[0005] In existing passenger transport emergency operation devices, a dedicated charge / discharge control unit is provided to control the charging and discharging of the energy storage device. As a result, the device has become larger.

[0006] The present invention was made to solve the problems mentioned above, and the object is to provide a power supply control device for passenger transport vehicles that can suppress the large-scale operation of the device.

[0007] The power supply control device for a passenger conveyor of the present invention includes: a power conversion circuit having a converter, an inverter, and a smoothing capacitor disposed between the converter and the inverter, which supplies power from the main power source to the motor; a charging control unit connected to the smoothing capacitor, which precharges the smoothing capacitor using power supplied from the main power source; an energy storage unit connected to the charging control unit; and an inverter control unit that operates using power supplied from the main power source and controls the inverter. When the standby mode is set to the passenger conveyor's operating mode, the charging control unit precharges the smoothing capacitor. When the drive mode is set to the operating mode, it charges the energy storage unit using power supplied from the main power source. When the power supply from the main power source is cut off, the inverter control unit switches the power supply source from the main power source to the energy storage unit and controls the inverter to decelerate and stop the motor.

[0008] Invention Effects

[0009] The power supply control device for the passenger conveyor according to the present invention can suppress the enlargement of the device. Attached Figure Description

[0010] Figure 1 This is a side view showing the schematic structure of the passenger conveyor of Embodiment 1.

[0011] Figure 2 It is shown Figure 1 The diagram shows the structure of the power supply control device.

[0012] Figure 3 It is shown Figure 2 The flowchart shows the operation of the control unit.

[0013] Figure 4 This is a structural diagram showing a first example of a processing circuit that implements the functions of the control main unit in Embodiment 1.

[0014] Figure 5 This is a structural diagram of a second example of a processing circuit that implements the functions of the control unit in Embodiment 1.

[0015] Label Explanation

[0016] 1: Main power supply; 2: Converter; 3: Smoothing capacitor; 4: Inverter; 10: Power conversion circuit; 11: Inverter control unit; 14: Charging circuit (charging control unit); 15: Energy storage unit; 100: Passenger conveyor; 108: Motor; 110: Power supply control device; 111: Lighting device. Detailed Implementation

[0017] The embodiments will now be described with reference to the accompanying drawings.

[0018] Implementation method 1.

[0019] Figure 1 This is a side view showing the schematic structure of the passenger conveyor of Embodiment 1.

[0020] exist Figure 1 In the passenger conveyor 100, a truss 101 is erected between the lower and upper levels. A conveyor body 107 is supported within the truss 101. The conveyor body 107 is constructed by connecting multiple steps into a ring. The conveyor body 107 transports passengers by circulating.

[0021] A pair of railings 105 and a pair of movable handrails 106 are provided on the truss 101. Figure 1 The image shows only one of a pair of railings 105 and one of a pair of movable handrails 106. Each movable handrail 106 is provided on its corresponding railing 105. Furthermore, each movable handrail 106 circulates synchronously with the conveyor body 107.

[0022] At each railing 105, a plurality of lighting devices 111 are provided along the movable handrail 106. Each lighting device 111 is capable of illuminating the railing 105 and the conveyor body 107.

[0023] An electric motor 108 and a control panel 109 are installed inside the truss 101.

[0024] The electric motor 108 rotates a drive sprocket (not shown). The rotation of the drive sprocket causes the conveyor body 107 and each moving handrail 106 to circulate.

[0025] The control panel 109 controls the operation of the passenger conveyor 100, that is, the operation of various equipment within the passenger conveyor 100. The control panel 109 has a power supply control device 110. The power supply control device 110 supplies power to the motor 108.

[0026] Figure 2 It is shown Figure 1 The diagram shows the structure of the power supply control device.

[0027] exist Figure 2 In this device, the power supply control unit 110 includes a power conversion circuit 10, an inverter control unit 11, a main circuit contactor 12, a control power supply 13, a charging circuit 14, an energy storage unit 15, a first relay 16a, a second relay 16b, and a lighting circuit 17. Figure 2 In this context, the inverter control unit 11 is referred to as the INV control unit 11. Furthermore, in... Figure 2 In this system, the main power source 1 is a three-phase AC power source that supplies AC power.

[0028] The power conversion circuit 10 supplies power from the self-contained power source 1 to the motor 108. The power supply circuit 10 includes a converter 2, a smoothing capacitor 3, and an inverter 4. Figure 2 In this context, converter 2 is denoted as CNV2, and inverter 4 is denoted as INV4.

[0029] Converter 2 will convert the AC power from the self-powered power source 1 into DC power.

[0030] A smoothing capacitor 3 is placed between the converter 2 and the inverter 4. In addition, the smoothing capacitor 3 smooths the DC power after rectification by the converter 2.

[0031] Inverter 4 converts the DC power smoothed by smoothing capacitor 3 into AC power of a set frequency.

[0032] The control power supply 13 converts the single-phase AC voltage in the main power supply 1 into DC voltage. In addition, the control power supply 13 supplies DC power to the inverter control unit 11 and the charging circuit 14.

[0033] The charging circuit 14 is connected to the smoothing capacitor 3. The positive side of the charging circuit 14 is connected to the positive side of the smoothing capacitor 3 via the main circuit contactor 12.

[0034] The charging circuit 14 receives power from the main power supply 1 via the control power supply 13 and precharges the smoothing capacitor 3. The charging circuit 14 protects the smoothing capacitor 3 from inrush current by performing precharging.

[0035] The energy storage unit 15 is an energy storage device connected to the charging circuit 14. Furthermore, the positive terminal of the energy storage unit 15 is connected to the positive terminal of the charging circuit 14 via the main circuit contactor 12.

[0036] Furthermore, the energy storage unit 15 is connected to the smoothing capacitor 3. The positive terminal of the energy storage unit 15 is connected to the positive terminal of the smoothing capacitor 3 via a resistor R and a diode D. Here, the diode D is provided to prevent discharge from the energy storage unit 15 to the smoothing capacitor 3 during pre-charging, such as during operation of the discharge circuit (not shown).

[0037] The inverter control unit 11 includes an inverter control circuit 6 and a control main unit 8. Figure 2 In this context, the inverter control circuit 6 is referred to as INV control circuit 6.

[0038] The control unit 8 controls the inverter control circuit 6, the main circuit contactor 12, the first relay 16a, the second relay 16b, and the lighting circuit 17. Furthermore, the control unit 8 performs overall control and management of the passenger conveyor 100.

[0039] The control unit 8 is connected to the control power supply 13 via the second relay 16b. Furthermore, the control unit 8 is connected to the energy storage unit 15 via the first relay 16a.

[0040] In addition, the control unit 8 is equipped with terminals for supplying power to the inverter control circuit 6 and the lighting circuit 17 respectively.

[0041] The inverter control circuit 6 operates using power supplied from the control unit 8. Furthermore, the inverter control circuit 6 controls the inverter 4 according to control commands from the control unit 8.

[0042] The lighting circuit 17 operates using power supplied from the control unit 8. Furthermore, the lighting circuit 17 supplies power from the control unit 8 to the lighting device 111. Therefore, the control unit 8 can supply power to the lighting device via the lighting circuit 17.

[0043] The main circuit contactor 12 opens and closes its contacts according to control commands from the control unit 8. The main circuit contactor 12 has a main contact 12a, a normally closed contact 12b, and a normally open contact 12c as contacts.

[0044] Main contact 12a opens and closes the circuit between main power supply 1 and power supply circuit 10. Normally closed contact 12b opens and closes the circuit between charging circuit 14 and smoothing capacitor 3. Normally open contact 12c opens and closes the circuit between charging circuit 14 and energy storage unit 15.

[0045] The main contact 12a, normally closed contact 12b, and normally open contact 12c operate in conjunction with each other. Therefore, when the main contact 12a is closed, the normally closed contact 12b is open, and the normally open contact 12c is closed. Conversely, when the main contact 12a is open, the normally closed contact 12b is closed, and the normally open contact 12c is open.

[0046] The first relay 16a switches the circuit between the energy storage unit 15 and the control main unit 8. The second relay 16b switches the circuit between the control power supply 13 and the control main unit 8.

[0047] The first relay 16a and the second relay 16b open and close the circuit in conjunction with each other according to the control command from the control unit 8. Furthermore, the first relay 16a is a normally closed contact, and the second relay 16b is a normally open contact. Therefore, when the first relay 16a is closed, the second relay 16b is open. Conversely, when the first relay 16a is open, the second relay 16b is closed.

[0048] Next, the operation of the power supply control device 110 will be explained.

[0049] When the main power supply 1 is turned on, as an initial state, the first relay 16a is deactivated and the second relay 16b is activated. Furthermore, when the main power supply 1 is turned on, the control power supply 13 supplies power from the self-powered power supply 1 to the charging circuit 14 and the control unit 8.

[0050] When the main power supply 1 is turned on, the control unit 8 starts operating using the power supplied from the control power supply 13. At this time, the control unit 8 sets the operating mode of the passenger conveyor 100 to standby mode. In addition, as a circuit control in standby mode, the control unit 8 causes the main contact 12a of the main circuit contactor 12 to open, the normally closed contact 12b to close, and the normally open contact 12c to open.

[0051] When the main power supply 1 is turned on, the charging circuit 14 begins to operate using the power supplied from the control power supply 13. Furthermore, the charging circuit 14 begins to pre-charge the smoothing capacitor 3 because the normally closed contact 12b is open. At this time, because the normally open contact 12c is open, no power is supplied from the charging circuit 14 to the energy storage unit 15.

[0052] After the smoothing capacitor 3 is fully charged and other initialization processes are completed, the control unit 8 sets the operating mode of the passenger conveyor 100 to drive mode. Furthermore, as part of the circuit control in drive mode, the control unit 8 turns on the main contact 12a of the main circuit contactor 12, turns off the normally closed contact 12b, and turns on the normally open contact 12c.

[0053] In drive mode, main contact 12a is closed, thus supplying power from main power supply 1 to motor 108. Furthermore, in drive mode, normally closed contact 12b is open, thus stopping power supply from charging circuit 14 to smoothing capacitor 3. Additionally, in drive mode, normally open contact 12c is closed, thus supplying power from charging circuit 14 to battery storage unit 15. Therefore, in drive mode, battery storage unit 15 is charged using power supplied from main power supply 1.

[0054] The inverter control circuit 6 receives power from the control unit 8 and receives control commands for the inverter 4 from the control unit 8. The inverter control circuit 6 operates the inverter 4 according to the control commands.

[0055] When the passenger conveyor 100 is stopped by the administrator's button operation, it enters standby mode again. In standby mode, the normally open contact 12c is open, thus stopping the power supply from the charging circuit 14 to the battery storage unit 15. Furthermore, in standby mode, the normally closed contact 12b is open, thus charging the smoothing capacitor 3.

[0056] Furthermore, during maintenance, it is necessary to discharge the power stored in the smoothing capacitor 3 by disconnecting the power supply from the main power source 1. In embodiment 1, for this purpose, as follows... Figure 2 As shown, the smoothing capacitor 3 is connected to the energy storage unit 15. Therefore, the energy storage unit 15 can be charged using the power stored in the smoothing capacitor 3 even when it is not fully charged.

[0057] Furthermore, even after the charging process from the smoothing capacitor 3 to the energy storage unit 15 is complete, if there is still residual power in the smoothing capacitor 3, the maintenance personnel can operate a discharge circuit (not shown). This operation eliminates the remaining power in the smoothing capacitor 3 through the discharge circuit.

[0058] Figure 3 It is shown Figure 2The flowchart shows the operation of the control unit 8. Figure 3 The flowchart primarily illustrates the actions taken when a power outage occurs during the operation of the passenger conveyor 100. Furthermore, it is repeatedly executed... Figure 3 The flowchart.

[0059] In step S101, the control unit 8 determines whether the power supply from the main power supply 1 has been cut off. When the power supplied from the control power supply 13 drops below a threshold, the control unit 8 determines that the power supply from the main power supply 1 has been cut off, and thus the process proceeds to step S102.

[0060] On the other hand, if the power supplied from the control power source 13 does not decrease below a threshold, the control unit 8 determines that the power supply from the main power source 1 has not been cut off, and terminates the operation. Figure 3 The processing of flowcharts.

[0061] In step S102, the control unit 8 turns on the first relay 16a and turns off the second relay 16b. As a result, the control unit 8 switches the power supply source from the main power source 1 to the energy storage unit 15.

[0062] In step S103, the control unit 8 controls the inverter 4 via the inverter control circuit 6 so that the motor 108 decelerates and stops at a set deceleration rate.

[0063] After stopping the motor 108, the control unit 8 stops supplying power to the inverter control circuit 6 in step S104, and supplies power only to the lighting circuit 17. Thus, the control unit 8 supplies power from the energy storage unit 15 to the lighting device 111.

[0064] When the main power supply 1 is restored, the passenger conveyor 100 starts up in standby mode. As a result, the charging circuit 14 uses the power supplied from the main power supply 1 to begin pre-charging the smoothing capacitor 3 again.

[0065] In this embodiment 1, the charging circuit 14 precharges the smoothing capacitor 3 using power supplied from the main power supply 1. Furthermore, the charging circuit 14 precharges the smoothing capacitor 3 when the standby mode is set as the operating mode of the passenger conveyor 100. Additionally, the charging circuit 14 charges the battery storage unit 15 using power supplied from the main power supply 1 when the drive mode is set as the operating mode.

[0066] Therefore, in the power supply control device 110 of Embodiment 1, the existing structure for pre-charging the smoothing capacitor 3 can be used to charge the energy storage unit 15. Thus, a dedicated charging control unit for charging the energy storage unit 15 is not required, and the increase in the size of the device can be prevented.

[0067] Furthermore, in the event of a power supply interruption from the main power source 1, the inverter control unit 11 switches the power supply source from the main power source 1 to the energy storage unit 15. Therefore, even if the power supply from the main power source 1 is interrupted, the inverter control unit 11 can continue to manage and control the passenger conveyor 100.

[0068] Furthermore, the inverter control unit 11 controls the inverter 4 to decelerate and stop the motor 108 in the event of a power supply interruption from the main power source 1. Therefore, the inverter control unit 11 is able to bring the passenger conveyor 100 to a smooth stop.

[0069] Furthermore, when the energy storage unit 15 is not fully charged and the power supply from the main power source 1 is cut off, it can be charged using the power stored in the smoothing capacitor 3. Therefore, excess power stored in the smoothing capacitor 3 can be effectively utilized.

[0070] Furthermore, in the event of a power outage from the main power supply 1, the inverter control unit 11 supplies power from the energy storage unit 15 to the lighting device 111. Therefore, the lighting device 111 can be illuminated even during a power outage. This improves visual visibility during passenger evacuation.

[0071] In addition, passenger transport aircraft 100 is not limited to Figure 1 The escalator shown can also be a moving walkway. In this case, the moving walkway can be horizontal or inclined. Furthermore, the conveyor 107 can also be a belt conveyor type.

[0072] Alternatively, a directional display showing the direction of the emergency exit can be pre-installed at the bottom of the passenger conveyor 100, and the control unit 8 can illuminate the display when the power supply from the main power source 1 is cut off. In this case, passengers can easily evacuate during a power outage.

[0073] Furthermore, each function of the control unit 8 in Embodiment 1 is implemented by a processing circuit. Figure 4 This is a structural diagram showing a first example of the processing circuitry that implements the functions of the control unit 8 in Embodiment 1. The processing circuitry 600 in the first example is dedicated hardware.

[0074] The processing circuit 600 can be, for example, a single circuit, a composite circuit, a programming processor, a parallel programming processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. Alternatively, each function of the control unit 8 can be implemented separately using the processing circuit 600. Or, the functions of the control unit 8 can be centrally implemented using the processing circuit 600.

[0075] also, Figure 5 This is a diagram showing a second example of a processing circuit that implements the functions of the control unit 8 in Embodiment 1. The processing circuit 700 in the second example includes a processor 710 and a memory 720.

[0076] In the processing circuit 700, the functions of the control unit 8 are implemented through software, firmware, or a combination of software and firmware. The software and firmware are described as programs. Furthermore, the software and firmware are stored in the memory 720. The processor 710 implements the functions of each unit by reading and executing the programs stored in the memory 720.

[0077] The program stored in memory 720 can also be described as a program that causes the computer to execute the steps or methods described above. Here, memory 720 is, for example, non-volatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read-Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), and EEPROM (Electrically Erasable Programmable Read Only Memory). Furthermore, disks, floppy disks, optical disks, CDs (compact disks), mini discs, and DVDs (Digital Versatile Disk) also belong to memory 720.

[0078] The functions of the above-mentioned parts can be partially implemented through dedicated hardware, and partially through software or firmware.

[0079] In this way, the processing circuit can implement the functions of the above-mentioned parts through hardware, software, firmware, or a combination thereof.

Claims

1. A power supply control device for a passenger conveyor, wherein, The power supply control device for the passenger conveyor includes: A power conversion circuit having a converter, an inverter, and a smoothing capacitor disposed between the converter and the inverter, supplies power from an autonomous power source to a motor. A charging control unit, which is connected to the smoothing capacitor, precharges the smoothing capacitor using power supplied from the main power source. An energy storage unit, which is connected to the charging control unit; as well as The inverter control unit operates using power supplied from the main power source to control the inverter. When the standby mode is set to the passenger conveyor operation mode, the charging control unit pre-charges the smoothing capacitor; when the drive mode is set to the operation mode, it charges the energy storage unit using power supplied from the main power supply. When the power supply from the main power source is cut off, the inverter control unit switches the power supply source from the main power source to the energy storage unit, and controls the inverter to decelerate and stop the motor. The energy storage unit charges itself using the energy stored in the smoothing capacitor when it is not fully charged and the power supply from the main power source is cut off.

2. The power supply control device for the passenger conveyor according to claim 1, wherein, When the power supply from the main power source is cut off, the inverter control unit supplies power from the energy storage unit to the lighting device.

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