JPH01317976A - Operation device for elevator during power failure - Google Patents

Abstract

PURPOSE:To make an elevator operatable even in power failure, by connecting a DC output obtained through rectification of AC power supply in parallel to a power supply comprising diodes connected in series to a battery and automatically supply electric power from the battery during power failure. CONSTITUTION:When an AC power supply 1 is in normal operation, power is supplied to an electric motor 7 via a rectifier 2, a capacitor 3 and an inverter 4 and to a control circuit 20 and a brake 9 via a transformer 15 a rectifier 16, a capacitor 17 and a converter 19. Simultaneously, reverse voltage is applied to diodes 30, 31 and an electric charger 14 charges a battery 13. Hereat, if AC power supply 1 fails, electric power is automatically supplied from the battery 13 to the motor 7 via the diode 30 and to the control circuit 20 and the brake 9 via the diode 31. In this case, the speed reference of the motor 7 is limited and set up by a battery voltage detected by a detector 32 or DC power supply voltage of an inverter bridge 4. Thus, running to the closes story can be continued without any shock in case of power failure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an elevator power outage operating device during an AC power outage during elevator drive.

(Prior Art) A conventional elevator operation device during a power outage will be described with reference to FIG. A rectifier 2 converts alternating current into direct current from an alternating current power source 1, and a smoothed direct current is obtained by a capacitor 3. Electric power converted from this DC power source to AC by an inverter bridge 4 is supplied to a motor 7 via current detectors 5 and 6.

A PG (pulse generator) 8 for detecting the motor speed is attached to the electric motor 7, and a brake 9 is directly connected for emergency use.

Since the capacitor 3 is charged by regenerative energy during the regenerative operation of the motor 7, the overvoltage detector 10 is provided so that when the voltage of the capacitor 3 increases, the transistor 11 is turned on and discharge is performed by the resistor 12.

The battery 13 is used for f! at the time of AC power outage. ! , the inverter bridge 4 is normally charged by the charger 14, and when the AC power supply is interrupted, the DC power supply for the inverter bridge 4 is obtained by manually turning on the switch 18a.

On the other hand, the control power source is supplied from the AC power source 1 by step-down by a transformer 15, converted to DC by a rectifier 16, smoothed by a capacitor 17, and then passed through a changeover switch 18b (the figure shows when the AC power source 1 is normal). Power is supplied to the motor control circuit 20 and the brake 9 by the DC/DC converter 19.

When the AC power source 1 is out of power, the selector switch 18b switches to the upper side and supplies power from the battery 13 to the DC/DC converter 19. The brake 9 is opened and closed by the brake contact 2G from the other output of the DC/DC converter 19.

The motor control circuit 20 shows an example of commonly used vector control of an induction motor. When the AC power supply is normal, the selector switch 18c is closed and the speed setting device 2
The maximum reference voltage is applied to voltage 2, which is input as the speed reference of the speed control circuit 23.

The speed is detected by the PG8 directly connected to the motor 7, and compared with the speed reference, the motor current reference ILl'+lV'+
i-, and the current control circuit 24 PWMs the current detected by the current detector 5.6 so that it matches the current reference.
(Pulse width modulation) control and drive the inverter bridge 4 by the drive circuit 25.

(Problem to be Solved by the Invention) In the conventional method, a power outage in the AC power supply is detected by some method, and the elevator is operated in an emergency by operating a changeover switch to switch to the battery power supply, so there is no continuity in the speed of the elevator. However, there were disadvantages such as restarting after stopping for a while, and the occurrence of shocks that made the ride uncomfortable.

The present invention is designed to continuously switch the control circuit power supply and the motor drive power supply without shock when the AC power supply fails, allowing the elevator to continue operating and stop at an appropriate floor without causing a sense of anxiety to the people riding the elevator. The object of the present invention is to realize a device for operating an elevator during a power outage.

A charging circuit is provided in which a DC output obtained by rectifying an AC power source is connected in parallel with a power source in which a diode is connected in series with a battery, and the battery is floating-charged from the power source obtained by stepping down the AC power and converting it into DC as a control power source. The configuration is such that control power can be obtained from either of the step-down DC power supply and the diode OR circuit of the battery, and when the AC power supply fails, the speed reference W of the motor is set to the battery voltage or the DC power a'1 of the inverter bridge. ．． ? 1! The structure of an embodiment of the present invention corresponding to pressure is shown in FIG. Circuits that are the same as those in FIG. 3 are denoted by the same numbers, and explanations thereof will be omitted.

A circuit in which a diode 30 and a battery 13 are connected in series is connected in parallel to a first DC power source in which an AC power source 1 is converted to DC by a rectifier 2 and smoothed by a capacitor 3.

On the other hand, the control power source is obtained by converting AC power g1 to DC voltage by a transformer 15, converting it to DC voltage by a rectifier 16, smoothing it by a capacitor 17, obtaining a second DC power source, and converting it to a motor control circuit 20 and a brake 9 by a DC/DC converter 19. Supplies driving power.

On the other hand, the battery 13 is charged from the power source of the capacitor 17 via the charger 14, and the diode 31 is connected in the opposite direction to the charger 14.

The voltage across the capacitor 3 (first DC power supply voltage) is detected by the voltage detection circuit 32, inputted to the limiter circuit 33, and the speed reference set by the speed setting device 22 is set to a value approximately proportional to the first DC power supply. Configure to limit.

In the above configuration, if the AC power supply is normal, the motor 7
Power is supplied from a first DC power source consisting of an AC power source 1, a rectifier 2, and a capacitor 3 via an inverter bridge 4.

On the other hand, control power and brake power are supplied from the AC power supply 1 to a second DC power supply consisting of a transformer 15, a rectifier 16, and a capacitor 17 via a DC/DC converter 19. Charger 14 is charging battery 13.

If the AC power supply is normal, the battery voltage is set lower than the first and second DC power supplies, so diode 3
0, a reverse pressure is applied to the diode 31.

When the AC power supply 1 loses power and the first DC power supply drops below the voltage of the battery 13, power to the motor is automatically supplied from the battery 13 via the diode 30. On the other hand, on the control power supply side, when the second DC power supply voltage of the capacitor 17 becomes lower than the voltage of the battery 13, it is supplied to the DC/DC converter 19 via the diode 31, and the control power supply of the motor control circuit 20 and the power supply for the brake are DC. / Maintained constant by DC converter 19.

The first DC power supply voltage (voltage of capacitor 3) decreases,
When the back electromotive voltage of the motor 7 becomes lower than that, the current stops flowing to the motor 7 and the motor stalls. Therefore, when the first DC power supply decreases, it is necessary to reduce the speed of the motor 7 according to the value. Therefore, the voltage across capacitor 3 is
The speed reference value detected by the voltage detection circuit 32 and set by the speed setter 22 is limited by the limiter circuit 33 in proportion to the first DC power supply, so that the motor 7 is always
Change the speed standard to one that allows the current to flow according to the current standard.

According to this embodiment, when the AC power supply fails, both the control circuit and the brake circuit power are automatically switched to be supplied from the battery. 1! The first DC power supply for driving is also supplied from the AC power supply.

By continuously switching the power supply to the battery without contact, and at the same time limiting the speed reference of the motor in proportion to the voltage of the first DC power supply, the motor is always kept in a state where current according to the current reference can flow through the motor. It is possible to stably generate torque of the electric motor.

Further, when the elevator is being lowered even during an AC power outage, the voltage across the capacitor 3 becomes higher than the battery voltage due to the regenerated power from the motor 7, and there is an advantage that the elevator can be lowered at high speed.

Another embodiment of the invention is shown in FIG. Description of circuits that are the same as those in FIG. 1 will be omitted. In FIG. 2, charger 14 is connected to charge battery 13 from a first DC power source. Also, the power source for brake 9.

The configuration is based on an OR circuit between the second DC power supply and the battery, and when the AC power supply is normal, the voltage of the capacitor I7, that is, the second DC power supply voltage, is set higher than the voltage of the battery 13, and the diode 31 Reverse pressure is applied.

A power failure detection circuit 34 is connected to the AC power supply 1, and when the AC power supply is normal, the relay 35 is turned on, the contact 36 is opened, and a series resistor 38 is inserted into the brake 9.

It is input to the speed control circuit 23 without limiting the speed reference.

When the AC power supply 1 is out of power, the outage detection circuit 34 is activated.

This is detected and the relay 35 is turned off. Since the second DC power supply decreases and power is supplied from the battery 13, the contact 36 is closed and the resistor 38 is shorted to avoid a decrease in the current supplied to the brake 9, resulting in an almost constant 'R current. Let it flow.

At the same time, contact 37 is opened and resistor 39 is inserted.

The limit circuit 33 lowers the speed reference set by the speed setter 22, inputs it to the speed control circuit 23, and operates to lower the speed to a speed at which the voltage of the battery 13 can overcome the back electromotive force of the motor 7 and allow current to flow. do.

It goes without saying that the operations described above can be realized by a microprocessor, except for the main circuit portion.

In FIG. 2, the transformer 15, the rectifier 16° diode 3I, the resistor 38, and the contact 36 may be omitted, and the control power source may be obtained from a constant voltage controlled power source via the charger 14.

〔Effect of the invention〕

A 911 AC power supply is applied, and a battery is connected in parallel to the first DC power supply smoothed by a capacitor via a diode to supply power to the motor. At the same time, the battery is constantly float charged, and the control power supply is connected to the AC power supply normally. When the AC power supply is interrupted, power is supplied from the AC power source, and in the event of an AC power outage, the power is supplied from the battery, and by providing a circuit that limits the speed of the motor by detecting a power failure or by using the first DC power supply voltage detection circuit, the AC To provide an elevator operating device during a power outage that can automatically continue operating an elevator during a power outage and stop the elevator at an appropriate floor without any shock during a power outage.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, FIG. 2 shows another embodiment of the invention, and FIG. 3 shows a conventional circuit configuration. 1... AC power supply 2... Rectifier 3... Capacitor 4... Inverter bridge 5.6... Current detector 7... Motor 8... P
G 9... Brake 10... Overvoltage detector 11... Transistor 12... Resistor
13... Battery 14... Charger
15... Transformer I6... Rectifier 1
7... Capacitor 18... Selector switch 19
...DC/DC converter 20...Motor control circuit 21...Resistor 22...Speed setter 23
... Speed control circuit 24 ... Current control circuit 25
... Drive circuit 26 ... Brake contact 30.3
1... Diode 32... Voltage detection circuit 33
... Limiter circuit 34 ... Power failure detection circuit 35
...Relay agent Patent attorney Nori Chika Ken Yudo Daishimaru Ken EJ Figure 1

Claims (6)

[Claims] (1) In the device for operating an elevator by driving an electric motor via an inverter bridge from a circuit in which a battery is connected in parallel via a diode to a first DC power source obtained by rectifying an AC power source and smoothing it with a capacitor, A power outage control means is provided which receives elevator control power and motor drive power from the AC power supply when the AC power supply is normal, and automatically supplies the control power and motor drive power from the battery when the AC power outage occurs. Features: Elevator power outage operation device. (2) In the item described in claim 1,
An elevator power outage operating device, wherein the power outage control means includes speed limiting means for limiting the speed of the electric motor based on the value of the first DC power source. (3) In the item described in claim 1,
An apparatus for operating an elevator during a power outage, characterized in that the power outage control means is provided with a circuit for detecting a power outage of the AC power supply, and a speed limiting means for limiting the speed of the motor to a speed equivalent to a battery voltage when the AC power outage occurs. . (4) In the device described in claim 1, the control power source is obtained from the second DC power source obtained by stepping down the AC power source via a DC-DC converter, and at the same time, the battery is obtained from the second DC power source. A device for operating an elevator during a power outage, comprising a charger for charging and a diode connected in antiparallel to the charger. (5) In the item described in claim 1,
An apparatus for operating an elevator during a power outage, characterized in that the first DC power supply charges the battery via a charger and simultaneously supplies power to the control power DC-DC converter. (6) In the item described in claim 1,
When the AC power supply is normal for the electric motor brake coil power,
An apparatus for operating an elevator during a power outage, which is configured to receive power from the second DC power source and from a battery during a power outage, and to switch a series resistance of a brake coil for voltage correction during a power outage.