JP3302722B2 - Elevator control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator control device, and more particularly to an elevator control device that can be operated when a power failure occurs.

[0002]

2. Description of the Related Art An outline of a conventional elevator system is shown in FIG.
Shown in In FIG. 4, reference numeral 1 denotes an elevator hoisting machine, 2 denotes a warp wheel for shifting the position of an elevator rope, 3 denotes a rope for suspending an elevator car 5 and a counterweight 7, and 4 denotes a car rail for guiding the elevator car 5. Reference numeral 5 denotes an elevator car, 6 a counterweight rail for guiding the counterweight 7, and 7 a counterweight.

FIG. 5 shows a schematic power supply system diagram of a conventional elevator system configured as described above. In FIG.
The three-phase input power sources R, S, and T are input to a hoisting machine control power converter 9 via a circuit breaker 8 and are converted into a predetermined DC voltage by a built-in converter, and the converted DC voltage is converted by a built-in inverter. The power is again converted to an AC power supply having a predetermined variable voltage and variable frequency,
Control. Reference numeral 11 denotes an encoder for detecting the speed of the hoist motor 10 and the position of the elevator car.

The elevator car circuit 15 includes a door driving inverter 16, a door motor 17 driven by the inverter 16, an encoder 18 for detecting a speed and a door position of the door motor 17, and a car lighting 1.
The power supply voltage is normally supplied from the building side to the car side through the elevator cable 14 via the step-down transformer 13 connected to the circuit breaker 8.

By the way, in the above-described elevator control device, when a power failure occurs, an elevator power failure occurs, and passengers can be put between floors. Therefore, as a countermeasure against power failure, a system as shown in FIG. 6 is generally employed. . FIG. 6 is a diagram in which a constant-voltage / constant-frequency power supply 20 is provided at the input to the elevator control device. However, as shown in FIG. 6, if all the power required for the elevator control device is supplied from the constant-voltage / constant-frequency power supply 20, the capacity of the constant-voltage / constant-frequency power supply 20 becomes very large, and it is not economical. Therefore, the methods shown in FIGS. 7 and 8 are employed.

First, FIG. 7 will be described. FIG. 7 shows that a hoist motor that requires a large amount of power at the time of a power outage is supplied with power from an inverter that converts the DC voltage of the battery 36 into AC,
Other in-car lighting power supply, door power supply and the like are supplied from the constant voltage / constant frequency power supply 20. In FIG. 7, in the normal state, the contactor MC3 (coil 28, contact 23),
Since the contact of the contactor MC4 (coil 29, contact 41) is closed, the DC power supply 32 in the power converter 9 or the lighting in the car, and the door power supply from the input power supplies R, S, T from the step-down transformer 39A, the contactor MC4 The power is supplied through the contact 41.

A battery 36 in the constant voltage / constant frequency power supply 20 is charged by a diode bridge 38 and a constant current charger 35. In the constant current charger 35, 35A is a constant current switching transistor, 35B is a charging current detection DCCT, and 35C is a current limiting resistor.

[0008] When the input power is interrupted, the contactor MC3 (coil 28,
Contact 23), contactor MC4 (coil 29, contact 4
1) is opened and the contactor MC5 (coil 3
1, contact 40) and contactor MC6 (coil 30, contact 33) are closed. Note that the reverse is performed in the normal state.

Therefore, at the time of a power failure, the voltage of the battery 36 changes to the discharge diode 37 and the contact 33 of the contactor MC6.
, A DC voltage is supplied to the hoisting machine driving inverter 22 in the power converter 9. In this case, the PN output voltage of the converter 21 is generally set higher than the battery voltage. However, during a power failure, the hoist motor is normally operated at a low speed to the nearest floor, and the motor terminal voltage becomes extremely low. For
There is no need to boost the battery voltage.

The voltage from the battery 36 is supplied to the transistor bridge 34, and the output is converted to an AC voltage having a constant voltage and a constant frequency. The converted voltage is stepped up to 100 V AC by the step-up transformer 39 because the battery voltage is low, and supplied to the DC power supply 32 in the power converter 9 or the car power supply and the door power supply through the contact point 40 of the contactor MC5.

In FIG. 7, reference numeral 24 denotes an AC reactor,
5 is a DCCT for detecting the converter input current, and 21 is provided with a regenerative ability to keep the output voltage (voltage between PN) constant and to make the input current coincide with the input voltage phase, that is, to control the input power factor to 1. Transistor converter bridge, 56 ~
Reference numeral 61 denotes six transistors constituting a transistor converter bridge.

FIG. 8 shows a control block of a conventional power converter for driving the hoisting motor 10. As shown in FIG. In the figure, the main circuit has been described with reference to FIG. Hereinafter, the operation of the block in FIG. 8 will be briefly described. According to the lift or stop command,
The position controller 47 detects the remaining amount at a predetermined floor based on the output of the encoder 11, and generates an elevator speed command from a built-in speed command generator in accordance with the remaining amount. The generated speed command is subtracted by the subtractor 47A from the current speed calculated by the speed detector 46 which counts the pulse train from the encoder 11 and calculates the current speed, and the deviation from the speed command is calculated.

The calculated speed deviation is subjected to a predetermined compensation calculation in a speed amplifier 45 and amplified to generate a torque command T. The torque command is calculated by the vector calculator 44,
Excitation current _id , torque current i as motor current command
Generates _q . In the current controller 43, the motor current command i
_d, actual motor current I _R in accordance with i _q, I _s, so that flow I _T, PWM control unit contained in the current control section 43 by (pulse width modulation circuit), and controls the inverter bridge 22 motor Controls terminal voltage.

On the other hand, the converter control unit 42 compares the voltage reference V _dcref , which is a converter voltage command value, which is normally a constant value generated by the converter voltage command, with the actual voltage _VDC between the PN output, by comparing the voltage reference V _dcref. The converter voltage is kept constant, and the input currents I _R , I _S , and I _T are controlled to match the input voltage phase, that is, the input power factor is controlled to 1. Also, the converter voltage _VDC is equal to the voltage command value V _dcref
If higher, the converter bridge 21 is controlled to operate as a regenerative converter.

[0015]

As described above,
In the conventional elevator control device, in order to prevent passengers from being in a canned state in the event of a power outage, as shown in FIG. Needs to include a constant voltage / constant frequency power supply 20 having another battery 36.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a driving power supply for a circuit in a car at the time of a power failure.
It is an object of the present invention to provide an elevator control device capable of performing uninterruptible power control using an existing hoist motor driving power conversion device without having to provide a special constant voltage and constant frequency power supply.

[0017]

An elevator control apparatus according to the present invention comprises a converter bridge for converting an AC power supply to a direct current, and a smoothing capacitor for smoothing the converted DC voltage.
And an inverter bridge, which is provided between the DC power input terminals of the inverter bridge and serves as a driving power source for a hoist motor that converts the direct current into alternating current and raises and lowers the elevator car, and is lower than a normal DC voltage. Emit voltage
A battery and charger for raw, the converter Buri
Power supply in the elevator car
A power supply deriving means for deriving a, a power failure detection circuit for detecting a power failure of the AC power supply, power supply deriving means, the charging voltage of the battery based on a detection signal of the upper Symbol power failure detection circuit to AC by the converter bridge Converting and adjusting the voltage as the power supply in the elevator car
It is a feature. Also, as the power supply deriving means,
A transformer is provided on the input side of the AC power supply,
Use it as a transformer, and use it as a step-up
It is characterized by using.

[0018]

According to the present invention, when a power failure of an AC power supply is detected by a power failure detection circuit, the DC voltage of the battery is converted into an alternating current by a converter bridge, and the alternating current is derived as a power supply in an elevator car through a power supply deriving means.
By doing so, the power supply in the car will be secured even during a power outage. Ma
In addition, the power supply deriving means is connected to the input side of the AC power supply.
Equipped with a lance, normally used as a step-down transformer,
When power is used, it is used as a step-up transformer.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 eliminates the constant voltage and constant frequency power supply 20 for AC 100 V from the elevator control device shown in FIG. 7, and connects a battery charger 35 and a battery 36 between the output power terminals PN of the converter bridge 21 in the power converter 9.
Is mounted so that the input of the DC-DC converter 55 as the control power supply of the inverter is input from the battery 36, and the DC voltage of the battery 36 is converted to AC by the converter bridge 21 at the time of a power failure, and the AC is converted to the transformer 5.
4 to be used as an in-car power supply.

In the configuration shown in FIG.
The operation when ST is normal is the same as the conventional method shown in FIG. When the three-phase input power supply RST has a power failure, a power failure is detected by the power failure detection circuit 27, and the contactor MC1 (the excitation coil 50, the main contact 51, the auxiliary contact 52 that closes when excited, and the auxiliary contact 53 that opens when excited). Since the coil 50 is not excited, the contacts 51 and 52 are opened and the contact 53 is closed.

The transformer 54 has a voltage of 200 V AC / 22 at normal time.
It operates as a step-down transformer from 0V to 100V, and operates as a step-up transformer to AC100V at the time of power failure.
The reason why this step-up transformer is necessary is that if the voltage of the battery 36 is increased, the battery 36 becomes very large, and thus the battery voltage is set lower than the voltage between the output voltage terminals PN of the converter in a normal state. In addition, the hoist motor 10
As described above, during a power failure, the hoist motor is normally operated at the lowest speed on the nearest floor, so that the motor terminal voltage becomes very low, and it is not necessary to increase the battery voltage.

In the event of a power failure, the battery voltage is supplied to the converter bridge 21 through the discharging diode 37, so that four of the transistors 56, 58, 59 and 61 of the converter bridge 21 are operated to set a predetermined constant voltage. The frequency of the PWM AC voltage is converted to R1 of the converter bridge,
Generated during T1. The PWM AC voltage of a constant voltage and a constant frequency regenerated by the converter bridge 21 passes through the AC reactor 24 and the contact 53 and is supplied to the step-up transformer 54.
Power supply AC1 for lighting inside the car
00V. In this case, the AC reactor 24, which is a necessary element in a converter bridge using transistors, is used.
Also serves to smooth the constant voltage constant frequency PWM AC voltage generated by the converter bridge 21.

Next, FIG. 2 in order to perform the operation of the present embodiment described above, the conventional control block selector switch 67 at the time of power failure and normal with respect to FIG. 8 is a voltage frequency reference 66
A is an embodiment in which a constant voltage / constant frequency control unit 66 is added. At the time of a power outage, the voltage and frequency of R2 and T2 are controlled to be predetermined values by comparing the voltage frequency reference 66A with the output feedback voltages R2 and T2 by the constant voltage and constant frequency control unit 66 .

At this time, since the changeover switch 67 has been switched to the constant voltage / constant frequency control unit 66 , the four transistors 56, 58, 59, 61 of the converter bridge 21 are operated to perform PWM (pulse width modulation) control.

The above-described converter control section and the like are normally operated by software such as a microcomputer, and the control power supply 55 is operated by the direct current of the battery 36, so that the program configuration as shown in FIG. become. That is, since the control program 71 for controlling the output voltage of the converter bridge 21 to be constant and controlling the input power factor to 1 is normally operated, and it is not necessary to operate the control program 71 at the time of a power failure, the constant voltage and constant frequency power supply program is not required. 5
2 can be activated.

Although this program normally needs to be operated at a predetermined sampling period, as described above, even if the constant voltage / constant frequency power supply program 52 is added, the processing time does not change. It can be easily incorporated into

In the above description, the constant-voltage / constant-frequency power supply generated at the time of a power failure has been described as a single-phase 100 V, but a three-phase output and a 200 V class output can be easily generated. Although the switching elements in the converter bridge 21 and the inverter bridge 22 have been described as transistors, GOT,
Other elements such as IGBTs can be used.

[0028]

As described above, according to the present invention, when a power failure of the AC power supply is detected by the power failure detection circuit, the DC voltage of the battery is converted to AC by the converter bridge, and the AC is supplied to the elevator car through the power supply deriving means. As power supply
Since the voltage is adjusted and derived, the elevator controller that has been compensated for the power failure can supply a voltage lower than the normal DC voltage.
Since it is possible to utilize the existing power converter for driving the hoisting motor only by adding a battery that generates pressure , the economic effect and the improvement of reliability can be easily achieved.

[Brief description of the drawings]

FIG. 1 is a main circuit block diagram according to an embodiment of the present invention.

FIG. 2 is a control block diagram according to an embodiment of the present invention.

FIG. 3 is a configuration diagram of a control program according to the present invention.

FIG. 4 is a configuration diagram of an elevator system.

FIG. 5 is a block diagram of a power supply system of a normal elevator system.

FIG. 6 is a configuration diagram in which a constant-voltage / constant-frequency power supply is inserted into a main power supply input of a normal elevator system.

FIG. 7 is a main circuit block diagram in which a power failure compensation circuit is added to a conventional elevator control circuit.

FIG. 8 is a control block diagram of a conventional elevator.

[Explanation of symbols]

 RST AC power supply 5 Car 10 Hoisting motor 21 Converter bridge 22 Inverter bridge 27 Power failure detection circuit 35 Charger 36 Battery 54 Transformer

Claims (2)

(57) [Claims] 1. A converter bridge for converting an AC power supply to a DC, and a smoothing capacitor for smoothing the converted DC voltage.
And an inverter bridge for converting the direct current into an alternating current to provide a drive power to a hoist motor that raises and lowers the elevator car, and is provided between a DC power input terminal of the inverter bridge and lower than a normal DC voltage. Generates voltage
A battery and charger for, the converter bridge
Connected to the AC power supply side of the
Includes a power supply deriving means for deriving, a power failure detection circuit for detecting a power failure of the AC power supply, power supply deriving means, converts the charging voltage of the battery based on a detection signal of the upper Symbol power failure detection circuit to AC by the converter bridge And adjust the voltage as the power source in the elevator car.
Control device for an elevator to the butterflies. 2. The elevator control device according to claim 1, wherein the power supply deriving unit receives an input of the AC power supply.
Transformer on the side, normally used as a step-down transformer
And is used as a step-up transformer during a power outage.
Elevator control device.