This invention relates to power backup system for providing backup to a secure and consumer friendly lift/ elevator. More particularly, the present invention provides a system and method for providing backup to a consumer friendly lift/ elevator which provides safety against fire or earthquake.
BACKGROUND & PRIOR ART
[002] With the globalization of the elevator industry, there has been a trend to standardize the elevator systems worldwide. This trend is leaning towards the use of traction systems for smaller elevator applications (i.e., fewer floors). Previously, hydraulic elevator systems were commonly used in applications with over five landings. The trend anticipates that; these applications will begin to utilize traction elevator systems. Such systems must be provided with emergency or back-up power systems that supply power not only to the controller, door operator and valves, but also to the main drive system.
[003] Many common back-up Universal Power Systems (UPS) use a high frequency waveform synthesis to create a near perfect three phase sine wave output waveform. This approach requires an expensive design. This approach can also cause problems for an elevator control system, as there will be high frequency noise and potentially a larger than expected number of zero crossings.
[004] The present invention overcomes the disadvantages of the common back-up UPS by providing a stepped square wave output. Therefore, the invention provides the power required with a much simpler and cost effective design.
[005] Reference may be made to the following known arts:
[006] Application No. 1432/DEL/2009 relates to an improved power backup system for lift/elevator comprises rectifier section and intelligent efficient charger module which charges the storage device, an inverter module which provides the voltage and frequency independent, efficient power during mains and in case of rescue mode also, controller of the total rescue mode operation setup which controls the power devices and is interfaced with the elevator control system wherein the controller logs the total elevator operation events through a single detecting device, a transfer device is provided which is excited by the load control apparatus in case of no mains is available and this transfers into back up mode for rescue operation to undergo, a regenerative energy converter to effectively harness the regenerative energy of the load, the secondary storage medium to deliver power during rescue mode wherein the load is connected between transfer device and the converter, remote monitoring unit and the graphical user interface to set up the parameters.
[007] Publication no JP2015205756 increases an efficiency of power conversion equipment for an elevator. An output current I1 of an inverter is calculated on the basis of a load torque current Iload, an acceleration torque current Iacc, which is calculated by set velocity, acceleration, and jerk, when starting operation. Whether or not a regenerative current is generated based on the output current I1 during operation thereof is determined. In only the case that it is determined that a regenerative current is generated, a converter 2 is operated. Consequently, it is possible to eliminate unnecessary operation of the converter 2 and to achieve a high efficiency of operation of an elevator.
[008] Publication no KR101735345 relates to a power supply system with an emergency control function of an elevator. An elevator control device moves a cage from the present position to the nearest floor according to a predetermined process in an emergency and performs a rescue operation.
[009] Publication no CN203345880 provides an intelligent emergency power supply rescue device for elevator detection. The intelligent emergency power supply rescue device for elevator detection comprises a control cabinet and an emergency power module, wherein the emergency power module comprises a charger, a battery, an inverter device, a boosting device, an external power source interface, an external power detection circuit, a power conversion device, an elevator emergency control device, a voice unit and an intelligent control system. The intelligent emergency power supply rescue device for the elevator detection can detect a change signal of a current or a voltage of an elevator control panel rapidly to decide whether to start up an automatic rescue device.
[010] Publication no CN203345880 provides an intelligent emergency power supply rescue device for elevator detection. The intelligent emergency power supply rescue device for elevator detection comprises a control cabinet and an emergency power module, wherein the emergency power module comprises a charger, a battery, an inverter device, a boosting device, an external power source interface, an external power detection circuit, a power conversion device, an elevator emergency control device, a voice unit and an intelligent control system. The intelligent emergency power supply rescue device for the elevator detection can detect a change signal of a current or a voltage of an elevator control panel rapidly to decide whether to start up an automatic rescue device.
[011] Publication no CN103407851 provides an intelligent elevator detection emergency power supply rescue device. The intelligent elevator detection emergency power supply rescue device comprises a control cabinet and an emergency power module, wherein the emergency power module comprises a charger, a battery, an inverter, a boosting device, an external power interface, an external power source detection circuit, a power source conversion device, an elevator emergency control device, a voice unit and an intelligent control system. The intelligent elevator detection emergency power supply rescue device can rapidly detect change signals of the current or the voltage of a control panel of an elevator to determine whether an automatic rescue device is started or not.
[012] Publication no JP2001316055 provide a control device for an elevator preventing as far as possible giving a feeling of physical disorder to a passenger, in the case that the elevator, detecting its abnormality, is once stopped and then its operation is restarted. hen abnormality of an elevator is detected by an abnormality detector 1a, the elevator is stopped by an emergency stopper device 1b, a direction of running just before stopping is stored in a memory unit 1d for a direction of running in the preceding time. When no abnormality is detected of the elevator in the abnormality detector 1a, a rescue operating device 1c, with an existing register call made as left, makes the elevator travel to the adjacent stop floor in a direction of running in the preceding time stored in the memory unit 1d for a direction of running in the preceding time, ordinary operation is restarted. In this way, operation can be restarted by preventing as far as possible giving a feeling of physical disorder to a passenger.
[013] Publication no CN207698956 relates to a battery technical field that charges provides an elevator emergency rescue device, net electricity input unit including the lift control cabinet, CPU the control unit, three -phase net electrical detection circuitry, control circuit is surveyed in the electric -examination of AC220V net, the charge protection circuit, storage battery, contravariant boost circuit, overhauling pattern control circuit, weighing instrument and net electricity input interlock circuit, it charges for storage battery through the charge protection circuit to net electric input unit, storage battery supplies power for the lift control cabinet through net electricity input interlock circuit through contravariant boost circuit, CPU the control unit is connected with elevator control system in the lift control cabinet through overhauling pattern control circuit, the weighing instrument is located on the car of elevator and the weighing instrument output is connected with the CPU the control unit input, storage battery is connected the power supply for CPU the control unit with CPU the control unit.
[014] US patent no 4,520,343 relates to the lift control system. The invention describes a system which can detect various events, such as movement of people or articles, fire break out, undesirable heat generation, panic caused by violence or the like occurring inside a cage or on a floor in front of the cage with its door being opened and which can control the lift, including the door, in such a manner as to cope with such events.
[015] US patent no 5,130,617 is directed to an inverter control device for controlling the induction motor that drives elevators.
[016] US patent no 7,275,622 discloses an emergency back-up power system for a traction elevator. A back-up power system for a traction elevator includes a power sensing device to sense a power loss or irregularity of the normal control power. An inverter timing system is connected to the power loss sensing device. The inverter timing system receives a power sensing signal from the power sensing device.
[017] US patent no 6,827,182 describes an elevator control apparatus which, when a power failure of the A.C. power source is detected, effectively and usefully uses the stored power in a power accumulator. When the A.C. power source is restored, it returns the elevator back to the original service to make the proper operation possible. The control system includes a control for, when a power failure is detected with a power failure detector, supplying power from the power accumulator to an inverter, to control circuits and to an illumination circuit of the elevator with a charge/discharge control circuit to continue the operation of the elevator.
[018] US patent no 6,533,074 relates to an elevator control apparatus capable of uniformly charging the power storage unit. The control apparatus includes a converter, an inverter, a controller for controlling a motor based on AC power. The motor has a variable voltage and a variable frequency supplied from the inverter and is operating an elevator. With the present invention, the charge/discharge control circuit sets the discharge amount of the power storage unit to a preset maximum value until a preset reference value of a charge state is reached, immediately following the completion of the uniform charging.
[019] US patent no 6,439,347 discloses an elevator control apparatus utilizing a power storage unit. An elevator control apparatus is provided that includes a converter for rectifying AC power into DC power; an inverter for converting the DC power into AC power of a variable voltage and a variable frequency and a controller.
[020] US publication no 2010044160 relates to a system which continuously drives an elevator hoist motor during normal and power failure operating conditions. A regenerative drive delivers power to the hoist motor from a main power supply during the normal operating condition and from a backup power supply during the power failure operating condition. A controller operates the regenerative drive to provide available power on the regenerative drive to the backup power supply during the normal operating condition.
[021] US publication no 2010006378 discloses a system which continuously drives an elevator hoist motor during normal and power failure conditions. A regenerative drive delivers power from a main power supply to the hoist motor during normal operation. A rescue operation circuit includes a backup power supply and is operable in the event of a failure of the main power supply to disconnect the regenerative drive from the main power supply and connect the back up power supply to the regenerative drive to provide substantially uninterrupted power to the hoist motor.
[022] Publication no. KR20090087064 is directed to a system that continuously drives an elevator hoist motor during normal and power failure conditions. A regenerative drive delivers power from a main power supply to the hoist motor during normal operation. A rescue operation circuit includes a backup power supply and is operable in the event of a failure of the main power supply to disconnect the regenerative drive from the main power supply and connect the back up power supply to the regenerative drive to provide substantially uninterrupted power to the hoist motor.
[023] Publication no. WO2009085288 relates to a method of controlling an elevator system comprises transferring power to an elevator car from a primary power supply to a backup power supply without interruption of power if the primary power supply fails or is disrupted. Following transfer of power to the elevator car from the primary power supply to the backup power supply either pending operations of the elevator car are completed or the elevator car is moved to a predetermined floor based on pending operations of the elevator car. The backup power supply can be attached to the elevator car.
[024] Publication no. CN101340106 relates to a power supply system for an elevator that includes: an inverter device which inverts sine-wave power supplied from an industrial power source to a rectangular wave to output; a storage battery which stores power of the industrial power source while normal operation and offers the stored power to the inverter device upon power failure.
[025] Publication no. JP2009221005 relates to recording suspicious action even if the suspicious action is performed with respect to a monitoring camera in a car. A sensor 12 of an abnormal condition detection section 8 in a camera unit 1 outputs an abnormal condition detection signal to a recording processing section 5 when the physical abnormal condition of the camera unit 1 is detected by a contact sensor, a power shutdown detection circuit, and an acceleration sensor. When the recording processing section 5 detects the abnormal condition detection signal, image information within time going back by a constant time from a period when detecting the abnormal condition detection signal, stored in an RAM 9 for operation in a backup recording unit 10, is copied and stored in a flash memory 7 so that the image information from a detecting period to a point of time going back by a constant set time is recorded and stored in the backup recording unit 10 regardless of passage of time after detection.
[026] Publication no. JP2009298546 relates to a control system for an elevator, capable of sending operation information on the elevator according to an emergency operation at long-period oscillation to a remote monitoring center when the emergency operation at long-period oscillation is performed due to a long-period ground motion, strong wind, or the like, thereby enabling efficient recovery by a dedicated engineer.
[027] Publication no. JP2009274845 relates to a maintenance center device and an elevator control device for remotely monitoring a plurality of kinds of elevators.
[028] Publication no. CN101551658 relates to an elevator energy consumption monitoring device provided with a plurality of energy consumption monitoring units wirelessly connected with a centralized monitoring center.
[029] Publication No. CN201184972 relates to an energy consumption monitoring device for an elevator.
[030] US Patent No. 7,549,515 relates to an elevator rescue system comprising an emergency power supply, an emergency brake switch for connecting and disconnecting the power of the emergency power supply to the brake, and an emergency drive switch for connecting and disconnecting the power of the emergency power supply to the drive motor.
[031] US Patent No. 7,681,693 relates to a method for performing an elevator rescue run in an emergency situation, the elevator comprising an elevator car, a counterweight, a rope suspending the car and the counterweight, a drive motor, an emergency brake for stopping the car in an emergency situation and a motor drive unit for supplying drive power to and for controlling the drive motor, as well as a corresponding elevator.
[032] US Patent No. 7,690,483 relates to an elevator comprising a car, a drive motor driving the car, a motor drive unit for controlling the drive motor and supplying power thereto, an encoder for sensing movement of the car, an elevator rescue system for rescue operation in case of an emergency situation, and particularly for moving a car to a landing in case of an emergency situation.
[033] Reference may be made to the product by “Swastik Power Electronics (India) Private Limited”. The product explains microcontroller based, low cost sine wave lift inverter with a three phase balanced & unbalanced load and SMPS charger.
[034] Further, reference may be made to an article by “Soyo Systems, Maharashtra, India”. The Soyo Systems proposes a technically advanced range of lift backup inverters that efficiently provide the function of an emergency lift operating system. The use of advanced technologies and superior engineering in its construction makes them ideal for operation in all weather conditions.
[035] Reference may be made to an article by “Fuji Electric FA Europe”. The article explains FRENIC Lift inverter to fulfill the requirements of lift applications. It includes the most advanced technology to offer a product that is easy to set up, is powerful and competitive. FRENIC Lift is the name of the technology and quality dedicated to elevator applications.
[036] Reference may be made to an article by “Kevin Power Solutions (P) Ltd”. The article explains, a 3 phase DSP Sine Wave Inverter designed to generate 3 phase 4 wire OUT PUT to support Lifts/Elevators during utility failure. In addition to this, important loads like staircase, parking, compound & common light and security system can be run through this innovative product. KEVIN ALBS is a unique combination of DSP SINE WAVE 3 phase inverter, storage, battery charger and an electronics change over module. It uses solid state static switches and has almost zero failure. High end DSP based design provides fast control. Automatic load sensing will stop indoor open condition at the time of low battery protection.
[037] Reference may be made to the product by “Foshan Mueller & Mico Elevator Technology Co Ltd”. The product presents a lift inverter which is a Vector-controlled frequency inverter. It has minimal noise, anti- interference performance, four-quadrant controlled, easy inspection, auto-calculating braking distance, smaller size and derived with three-phase AC synchronous motor.
[038] Again, reference may be made to the products by “Technovision Energy Pvt Ltd”. The article explains lift inverters which do not emit smoke any other kind of gases that are harmful to the environment. Further these do not generate noise. This makes them preferred power backup products also. Apart from this, some other features that make them useful products include high reliability, flexibility and easy adaptability.
[039] Thus, the lift system requires that the back-up power system provides full power to the system. This requires that the back-up power system should be capable of switching to high power load. In conventional system ARD is installed in the lift itself and hence during power outages it needs to be switched on and hence the lift is stopped for a while which creates panic among users/ consumers and when it gets start a jerk is experienced. A different system approach for controlling the lift is needed so as to assure that the back-up power system provides lowest switching time during power outages and eliminates the jerk or any panic among the consumers.
[040] In order to overcome above listed prior art, present invention provides lift/ elevator with emergency rescue device with fire and earthquake alarm system which communicates to the backup system to stop the AC power to the load through the stored energy of the storage medium during failure.
OBJECTS OF THE INVENTION
[041] An object of the present invention is to provide a system and method for providing backup to a consumer friendly lift/ elevator with enhanced security feature.
[042] Another object of the present invention is to provide emergency rescue device with fire and earthquake sensing which communicates to the backup system to stops the power supplied to the load through the stored energy of the storage.
[043] Another object is to provide a system for providing backup to a safe and consumer friendly lift/ elevator with IOT based advertisement display which is controlled by user from remote location.
SUMMARY OF THE INVENTION
[044] According to this invention, there is provided a system and method for providing backup to a safe and consumer friendly lift/ elevator which provides safe operation during emergency situation such as fire or earthquake. The system comprises a bypass mode rectifier for charging with an efficient charger module (1) to charge the storage device. An inverter module is provided for supplying efficient power during mains as well as during rescue mode. The backup system is powered ON through rectifier using regenerative energy and charges the battery and during low battery of backup system sends a message to the emergency rescue device (ERD) with backup time controlled through backup system. The ERD communicates with the fire and seismic sensing unit provided at the building and raises an alarm to the user using IoT. The ERD unit also communicates with the inverter module to switch the backup power off and the backup device goes into manual mode and will not be turned ON until it is switched on by the user manually.
[045] In an embodiment of the present invention, the display unit is provided at the lift which is configurable by user using IoT based server from remote location.
BREIF DESCRIPTION OF THE DRAWINGS
[046] Further objects and advantages of this invention will be more apparent from the ensuing description when read in conjunction with the accompanying drawings and wherein:
[047] Figure 1 shows the block diagram of the present invention.
DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS
[048] Reference may be made to figure 1 which provides a system and method for providing backup to a consumer friendly lift/ elevator which provides jerk free operation during outages and avoids any panic situation among the consumers. The system comprises a bypass mode rectifier for charging with an efficient charger module (1) to charge the storage device. An inverter module is provided for supplying/ stopping power during mains/ rescue mode. The backup system is powered ON through rectifier using regenerative energy and charges the battery and during low battery of backup system sends a message to the emergency rescue device (ERD) with backup time controlled through backup system, and lift door will be open. The ERD communicates with the fire (2A) and seismic sensing (2B) unit provided at the building and raises an alarm to the user using IoT. The ERD unit also communicates with the inverter module to switch the backup power off and the backup device goes into manual mode and will not be turned ON until it is switched on by the user manually.
[049] In an embodiment of the present invention, the display unit is provided at the lift which is configurable by user using IoT based server from remote location. ERD communicate with user using IoT based communication media which communicates with elevator control unit which displays accordingly using lift controller.
[050] The elevator control unit includes a controller to control the power devices which communicates with the sensing units of the building. The controller is interfaced with the emergency rescue device. The controller of emergency rescue device sends signal to elevator control unit during emergency situation and to stop functioning and after the opening of doors and the lift controller shuts down till it is switched ON manually.
[051] In an aspect emergency rescue device displays the advertisement on the screen which is controlled by user using IoT based server.
[052] The elevator control unit communicates with the lift controller using wireless media such as using WiFi; LORA; IOT or any other such kind to collect the real time information/ signals and communicates it to the emergency rescue device (ERD) which accordingly switches off the power backup system during emergency situation.
[053] A transfer device being controlled by an elevator control unit to transfer the power from mains mode to back up mode for rescue operations, where in the power being transferred from mains mode to back up mode when no mains is available and wherein the transfer device being controlled by an interface unit.
[054] The ERD stores the details of the lift and the stored data is processed from cloud based central database. The system gives an alarm/ message to the operator during an emergency situation or faulty conditions.
[055] Numerous modifications and adaptations of the system of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the true spirit and scope of this invention.

Claims:

WE CLAIM:
1. A system and method for providing backup to a safe lift/ elevator comprise;
? a bypass mode rectifier for charging;
? an efficient charger module (1) to charge the storage device;
? emergency rescue device (ERD) characterized in that a controller communicating with the fire sensing (2A) and seismic sensing (2B) unit to sense and emergency situation and emergency rescue device controlled advertisement display unit wherein ERD communicates with user through IoT based server and user can control the display unit from remote location;
? an inverter module to provide efficient power during mains as well as during rescue mode characterized in that the backup system is powered ON through rectifier using regenerative energy and charges the battery and during low battery of backup system sends a message to the emergency rescue device (ERD) with backup time controlled through backup system, and lift door will be open;
? elevator control unit characterized in that a controller to control the power devices, wherein the controller being interfaced with the emergency rescue device to stop the lift as required;
? characterized in that the controller of emergency rescue device sends signal to elevator control unit during emergency to stop functioning and after the opening of doors and the lift controller shuts down till the power comes back.
2. The system and method for providing backup to the safe lift/ elevator as claimed in claim 1; wherein the emergency rescue device (ERD) switches off the backup system which can be switched on manually once the situation is normal.
3. The system and method for providing backup to the safe lift/ elevator as claimed in claim 1; wherein the display unit is provided at the lift which is configurable by user using IoT based server from remote location. ERD communicate with user using IoT based communication media which communicates with elevator control unit which displays accordingly using lift controller.
4. The system and method for providing backup to the safe lift/ elevator as claimed in claim 1; wherein the elevator control unit communicates with the lift controller using WiFi; LORA; IOT or any other such kind.