JP3580097B2 - Elevator control device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an elevator control device that operates an elevator using an inverter device and performs a rescue operation via a backup power source via the inverter device when a power failure occurs.
[0002]
[Prior art]
If a power failure occurs during the operation of the elevator, the elevator may stop between floors and trap passengers. As a countermeasure against this, a power failure operation rescue device that supplies DC power to an inverter using a backup power supply at the time of power failure and operates the elevator to the nearest floor has been put to practical use.
A battery is generally used as the backup power supply for reasons such as economy, and the number of used batteries is kept to a minimum.
[0003]
[Problems to be solved by the invention]
For this reason, the input DC voltage to the inverter of the main circuit at the time of a power failure is lower than that at the time of the commercial power supply, and accordingly, the voltage applied to the induction motor that drives the elevator also becomes lower. The speed had to be limited to several tenths to one tenth. For this reason, the driving time at the time of rescue becomes longer by that much, and a large capacity battery is required. Also, in order to make the operating speed the same between the case where the power supply is 200V system and the case where the power supply is 400V system, the voltage of the battery must be changed. there were.
[0004]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and is characterized by a simple configuration in which a primary side is connected to a commercial AC power supply, and a secondary side is connected to a control circuit for controlling an inverter or the like. A backup power supply equipped with a chargeable / dischargeable battery and an inverter device is connected in parallel with the control circuit on the secondary side of the phase transformer, and in the event of a power failure, AC power is directly supplied from the backup power supply to the control circuit. In addition, the backup power supply supplies single-phase AC power having the same voltage as the commercial AC power supply voltage to the inverter via the single-phase transformer.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an elevator control device according to the present invention will be described with reference to the drawings.
FIG. 1 is a circuit diagram illustrating an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a commercial AC power supply, 2 denotes a circuit breaker, 3 denotes a normal operation contact which is normally closed and opens when a power failure occurs, 4 denotes a power failure contact which is normally opened and is closed during a power failure, and 5 denotes a converter. , 6 is a smoothing capacitor, 7 is an inverter, 8 is an induction motor for driving an elevator, 9 is a single-phase transformer, 10 is a control circuit for controlling the inverter 7 and various operation controls of the elevator, and 11 is normally closed. A contact that opens during a power failure, 12 is a contact that opens during normal times and closes during a power failure, and 13 is a backup power supply during a power failure, such as an AC uninterruptible power supply (eg, a rectifier 14, a battery 15, an inverter 16, and the like). (UPS).
[0006]
In the above configuration, AC power is supplied to the converter 5 from the commercial AC power supply 1 through the contact 3 in normal times, and is converted into DC power. The inverter 7 converts the DC power into a three-phase AC having a variable voltage and a variable frequency and supplies the three-phase AC to the induction motor 8 to drive the elevator.
[0007]
Further, the voltage is stepped down from the commercial AC power supply 1 to, for example, 100 V AC through a single-phase transformer 9 and supplied to a control circuit 10 to control the inverter 7 and various operation controls of the elevator. The battery 15 is charged through the rectifier 14 in the battery 13.
[0008]
On the other hand, at the time of a power failure, the contacts 3 and 11 are opened and the contacts 4 and 12 are closed, so that DC power from the battery 15 is converted to 100 V AC power via the inverter device 16 and directly supplied to the control circuit 10. At the same time, AC power boosted to the same voltage as the power supply voltage via the single-phase transformer 9 is supplied to the converter 5, and the induction motor is driven in the same manner as in a normal state to perform the rescue operation of the elevator.
[0009]
In this case, single-phase AC power is supplied to converter 5 at the time of a power failure, but there is no particular problem because the rescue operation of the elevator is generally short.
[0010]
【The invention's effect】
According to the present invention, the same voltage as the power supply voltage can be supplied to the inverter even during a power outage, so that the elevator can be operated at the rated speed and the battery capacity can be kept to a minimum. Also, it is only necessary to add the same backup power supply irrespective of the power supply voltage, so that the configuration is simple and standardization is easy.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of an elevator control device according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Commercial AC power supply 5 Converter 6 Smoothing capacitor 7 Inverter 8 Induction motor 9 Single-phase transformer 10 Control circuit 13 Backup power supply 15 Battery

Claims (2)

A converter for converting commercial AC power to DC, an inverter for converting the converter output to AC of variable voltage and variable frequency, and a control circuit for connecting the commercial AC power to the primary side and controlling the inverter on the secondary side In an elevator control device including a connected single-phase transformer and an induction motor that is fed by the inverter and drives the elevator,
On the secondary side of the single-phase transformer, a backup power supply including a chargeable / dischargeable battery and an inverter device is connected in parallel with the control circuit. An elevator control device, wherein the controller is configured to supply single-phase AC power having the same voltage as the commercial AC power supply voltage from the backup power supply via the single-phase transformer to the inverter. The elevator controller according to claim 1 , wherein the backup power supply is an AC uninterruptible power supply (UPS).

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