JPH02106573A - Elevator control device - Google Patents

Abstract

PURPOSE:To protect a storage battery during rescue operation by a method wherein a switching command is outputted to a regenerating voltage detecting means so that, during rescue operation, switching to a second detecting level from a from a first detecting level is effected. CONSTITUTION:When outage is detected by a rescue operation switching circuit 22, switching to a rescue operation mode is performed. An electromagnetic contact apparatus 21 is closed, a storage battery 11 is connected to the DC voltage circuit of a voltage type inverter device 8, DC is converted to AC, and rescue operation of an elevator is executed. Meanwhile, A switching signal 22a by means of which a detecting level is switched is outputted to a regenerating voltage detecting circuit 23, and the detecting level is set so as to be reduced responding to that during rescue operation. During rescue operation, a transistor 6 is worked, regeneration energy of an elevator is absorbed by a resistor 5 to reduce a DC voltage, and a regenerating voltage is suppressed to a proper value in the voltage range of the storage battery 11. This constitution prevents application of an overvoltage on the storage battery 11, and enables prevention of the damage of the storage battery.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an elevator control device that controls the operation of an elevator using a voltage type inverter device and performs a rescue operation of the elevator in the event of a power outage.

(Prior Art) Elevators, which are important means of transportation in buildings, have the role of transporting passengers safely and quickly to their destination floors. Regarding safety in particular, various measures have been taken to prevent such accidents, which can lead to accidents where passengers are trapped in the car.

However, recently, there has been an increasing social demand to safely rescue passengers even if there is a temporary power outage in case of an emergency. Therefore, in addition to the main body of the elevator control device, many rescue operation devices have been installed to safely and quickly rescue passengers in the event of a power outage or breakdown. This rescue operation device generally includes a battery as an emergency power source, and rescue operation of the elevator is performed by a dedicated control device.

FIG. 4 is a schematic configuration diagram showing an example of an elevator control device equipped with a rescue operation device during a power outage and using an inverter. This elevator control device includes an elevator control device main body as a main control device, and a rescue operation device 9 for rescuing passengers in an emergency such as a power outage.

First, the elevator control device main body is configured as follows. The converter 3 made of a diode rectifier converts the alternating current supplied from the three-phase alternating current TJSFi, (2) through the electromagnetic contactor 2 into direct current.

The inverter device 8 constitutes a voltage type inverter with a self-extinguishing element such as a transistor and a smoothing capacitor 4 connected between the DC input terminals, and converts the DC output from the converter 3 into AC, and its output is electromagnetic contactor 17
is supplied to the electric motor 19 to be driven. The DC circuit of the inverter 8 includes a resistor 5. A regenerative energy absorption circuit composed of a transistor 81 and a regenerative voltage detection circuit 7 is provided, and when the DC voltage of the regenerative voltage detection circuit 7 increases due to the regenerative energy of the elevator during the regenerative mode operation of the elevator, the transistor operates and the resistor 5 The regenerated energy is absorbed. Also, when the DC voltage drops,
Transistor 6 is turned off. Therefore, during regeneration mode operation, the electric motor 1 is operated by the inverter.
Regenerative energy is absorbed by independently detecting the DC voltage, regardless of the control in step 9.

On the other hand, the rescue operation device 9 is provided for rescuing passengers from an accident such as a power outage, and is configured as follows.

The storage battery 11 is provided as an emergency power source in the event of a power outage, and is constantly charged by a charger IO connected to an AC power source 1. The inverter 15 converts direct current into alternating current, and the output from the storage battery 11 is supplied to the electric motor 19 via the electromagnetic contactor 16 that is turned on during a power outage. The DC side circuit of this inverter 15 also has a resistor 12. A regenerative energy absorption circuit similar to that described above is provided, which is composed of a transistor 131 and a regenerative voltage detection circuit 14. In this case, the regenerative voltage detection circuit 14 is set to a detection level that prevents overvoltage from being applied to both ends of the storage battery 11 due to a voltage increase due to regenerative energy of the elevator, and the regenerative voltage detection circuit 7 in the elevator control device main body detects The level is set to a different value. Note that 18 is an elevator car, and 20 is a hanging weight.

According to the device configured in this way, the elevator is normally controlled by applying the output of the inverter device 8 to the electric motor 19 through the electromagnetic contactor 17, and the regenerative energy is absorbed by the regenerative energy absorption circuit. On the other hand, if a power outage occurs on the AC power supply l side, the electromagnetic contactor 17
is opened and the electromagnetic contactor IB is closed, so the output of the inverter 15 of the rescue operation device 9 is supplied to the electric motor 19, and the elevator is operated for rescue to the nearest floor. Further, the regenerative energy at this time is absorbed by the regenerative energy absorption circuit.

By the way, in such an elevator control device,
A regenerative energy absorption circuit for absorbing the regenerated energy of the elevator must be provided not only in the elevator control device itself but also in the rescue operation device that is used only during power outages. This not only increases the size of the device, but also
The space could not be used effectively, and costs were high.

(Problems to be Solved by the Invention) Therefore, the regenerative energy absorption circuit of the elevator control device main body may be used in common by allowing the regenerative energy during the rescue operation by the rescue operation device 3 to be absorbed. However, the energy absorption circuit of the elevator control device main body is provided mainly for the purpose of protecting the transistor elements of the inverter from an increase in the DC voltage of the DC control circuit of the inverter due to regenerated energy. In addition, the energy absorption circuit on the rescue operation device side is
Since it is provided for the purpose of protecting the storage battery 11 from a DC voltage increase in the DC side circuit of the inverter due to regenerative energy, the detection levels for the respective regenerative voltages 7 and 14 are different. Therefore, for example, when the detection level of the DC voltage during normal operation is set and the DC voltage increases during the regeneration mode operation, regenerative energy is supplied to the storage battery 11 before the transistor 8 is turned on.

If this happens, the storage battery 11 will be in an overvoltage state, causing a problem that the electrodes of the storage battery 11 will be damaged. Furthermore, the regenerative energy during rescue operation is sufficiently smaller than the regenerative energy during normal operation, so even though the regenerative energy absorption circuit of the elevator control device itself can sufficiently absorb the regenerative energy during rescue operation, Two regenerative energy absorption circuits are required. Therefore, there was a problem that the regenerative energy absorption circuits 7 and 14 could not be shared.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an elevator control device that has a simple configuration and can reduce costs by absorbing the regenerated energy of the elevator during a rescue operation and protecting the storage battery without damaging it even if the inverter device is shared. be.

C. Constitution of the Invention (Means for Solving the Problems) The present invention has taken the following measures in order to solve the above problems and achieve the objectives. That is, the present invention includes a regenerative energy absorption circuit that detects regenerative energy during elevator operation as a DC voltage, and when this detected voltage exceeds a predetermined detection level, causes the increased DC voltage to be consumed by a load connected to a DC circuit. An elevator control device that controls an elevator using an inverter provided with the device includes a DC power supply device that is connected to the inverter DC circuit during a power outage, and a DC power supply device that is provided in the energy absorption circuit and that detects a rise in DC voltage due to regenerated energy during normal operation. The first detection level and a second detection level for detecting an increase in DC voltage due to regenerated energy during rescue operation are set to be switchable, and the voltage of the inverter DC circuit exceeds the second detection level during rescue operation. and a regenerative voltage detecting means for causing the voltage increase to be consumed by the load to suppress the voltage of the DC circuit within the voltage range of the DC power supply device; and rescue operation switching means for outputting a switching command to switch from the detection level to the second detection level.

(Effects) By taking such measures, the following effects are achieved. Using one inverter device, the detection level of the DC voltage is switched between rescue operation and normal operation by a switching command from the switching means, and when the elevator is operating in the regeneration mode, the detection level of the regenerative energy of the elevator is changed to the detection level of the DC power supply. Since the voltage can be appropriately suppressed within the range, no abnormal voltage will be applied to the DC power supply. the result,
Even if one inverter device is shared during normal operation and rescue operation, damage to the DC power supply device can be prevented. This also simplifies the configuration of the elevator control system.
Moreover, costs can be reduced.

(Example) FIG. 1 is a diagram showing a schematic configuration of an elevator control device according to the present invention. In FIG. 1, a converter 3 converts an alternating current input from an alternating current power supply 1 through an electromagnetic contactor 2 into direct current, and an inverter 8
The direct current output from the converter is converted into alternating current, and the output is supplied to the electric motor 19 that drives the elevator to control the elevator. This inverter B constitutes a voltage type inverter with a smoothing capacitor 4 connected between its DC terminals. Further, the DC side circuit of the inverter 8 is provided with a regenerative voltage detection circuit 23 (details of which will be described later) capable of switching the detection level during normal operation and rescue operation, and a regenerative energy absorption circuit consisting of a transistor and a resistor 5. On the other hand, storage battery 1 used in elevator rescue equipment
1 is connected to the DC side circuit of the inverter through an electromagnetic contactor 21 whose output terminal is closed during the rescue operation mode.

The rescue operation switching circuit 22 is connected to the AC power source 1, and when a power outage or the like is detected, it gives a detection level switching command to the regenerative voltage detection circuit 23.

FIG. 2 is a diagram showing a specific example of the circuit configuration of the regenerative voltage detection circuit 23 that can switch the detection level of the DC voltage generated by regenerative energy during the operation mode and during the rescue operation. The regenerative voltage detection circuit 23 includes a constant voltage diode 2 that detects the DC voltage input to the inverter via a resistor R3.
A series circuit of the changeover switch 32 and the resistor R1, and a series circuit of the changeover switch 33 and the resistor R2 are provided in parallel with the series circuit of the changeover switch 32 and the resistor R6. The regenerative voltage detection level in the constant voltage diode 27 is set by selecting the ratio of the resistor R1 and the resistor R3 or the ratio of the resistor R2 and the resistor R3, that is, the values of R1 and R2. The changeover switches 32 and 33 are switched in response to the rescue operation changeover signal 22a to select the resistor R1 or the resistor R2 and change the detection level of the constant voltage diode 27. Further, the base of a drive control transistor 28 is connected to the anode of the diode 27, and the base of the drive control transistor 29 is directly connected to the collector of the transistor 28. Power is supplied to these two transistors 28 and 29 from the driving power source 24 via the base current limiting resistor R4 and the resistor R5, and the regenerative energy absorbing transistor 6 is thereby controlled.

Note that the base current 1b of the transistor 6 is controlled by the set value of the base current limiting resistor R4.

Next, the operation of the embodiment configured as described above will be explained.

First, during normal operation, the elevator control system is in normal operation mode, and the electromagnetic contactor 2 is closed.

The electromagnetic contactor 21 becomes open circuit. and inverter device 8
The output is given to the electric motor 19 to control the elevator.

On the other hand, absorption of regenerative energy is performed as follows. Since the changeover switch 33 of the regenerative voltage detection circuit 22 is closed, the detection circuit 23 is formed such that the changeover switch 33 connects the resistor R2 to the cathode side of the constant voltage diode 27. In the regenerative operation mode, the regenerative energy is returned to the inverter DC circuit, so the inverter DC voltage Vdc rises, R2xVdc/ (R3+R2)>Vz d+Vbe
(1) Vzd: Breakdown voltage Vbe of the voltage regulator diode: When the base-emitter voltage condition of the transistor 28 is satisfied, the voltage regulator diode 27 breaks down and turns on. Then, transistor 28 is turned on and transistor 29 is turned off. When this transistor 29 is turned off, a base current flows through the regenerative energy absorbing transistor 6 via the resistor R4, and the transistor 6 operates. Due to the operation of this transistor 6, the regenerated energy of the elevator is absorbed by the resistor 5, and the DC voltage Vdc drops. When the DC voltage Vdc drops below a level that satisfies equation (1), the voltage regulator diode 27 does not break down and the transistor 28 turns off. Then transistor 2
9 operates on behalf of the DC voltage V and stores regenerative energy.
dc rises. The regenerative energy absorption circuit repeats the above operation and absorbs the regenerative energy of the elevator.

Next, when a power outage occurs in the elevator power supply, the elevator control system switches to rescue operation mode, and the electromagnetic contactor 2
is open circuit, and T & magnetic contactor 21 is closed circuit.

At the same time, when a power outage is detected by the rescue operation switching circuit 22, the mode is switched to the rescue operation mode, the electromagnetic contactor 21 is closed, and the storage battery 11 is connected to the DC voltage circuit of the voltage type inverter device 8. The DC voltage obtained by this DC voltage circuit is converted into AC by the inverter device 8, and the elevator is operated for rescue using this AC voltage.

On the other hand, the elevator rescue operation switching circuit 22 performs rescue operation of the elevator, and a switching signal 22a for switching the detection level is sent to the regenerative voltage detection circuit 23. Then, the signal 22 is sent to the regenerative voltage detection circuit 23.
When a is input, the detection level is set to be lowered in response to the rescue operation.

That is, as shown in FIG. 2, when the switching signal 22a is input, the changeover switch 33 is opened and the changeover switch 32 is closed, so that the detection circuit 23 is formed such that the resistor R1 is connected to the cathode side of the constant voltage diode 27. be done. Therefore, when the regenerative energy in the regenerative operation mode is returned to the inverter DC circuit, the voltage detection circuit 23 detects an increase in the inverter DC voltage Vdc at this time. That is, the resistor R1 is set to R1>R2, and the inverter DC voltage Vdc increases, R1xVdc/ (R1, +R3)>Vzd+Vbe
...When the inverter DC voltage Vdc satisfies the condition (2), the voltage regulator diode 27 breaks down and turns on, and the transistor 28 turns on.
Transistor 29 is turned off.

That is, here, the ratio of resistance R1 to resistance R3 during rescue operation is the resistance R3 during normal operation described above.
Therefore, when the same level of regenerative energy is given to the energy absorption circuit, the voltage applied to the constant voltage diode 27 during rescue operation will be the same as the voltage applied to the constant voltage diode 27 during normal operation. The voltage will be higher than this voltage. As a result, when the inverter DC voltage Vdc2, which is lower than the inverter DC voltage Vdcl during normal operation, is reached, the constant voltage diode 27 and the transistor 28 are turned on.

Further, when the transistor 29 is turned off, a base current flows through the regenerative energy absorbing transistor 6 via the resistor R4, and the transistor 6 operates.

Due to the operation of this transistor 6, the regenerated energy of the elevator is absorbed by the resistor 5, and the DC voltage Vdc drops. When the DC voltage Vdc drops until it satisfies equation (2), the voltage regulator diode 27 does not break down and the transistor 2
8 is off. Then, the transistor 29 operates instead, stores regenerated energy, and increases the DC voltage Vdc. The regenerative energy absorption circuit repeats the above operation and absorbs the regenerative energy of the elevator.

In this way, the waveform of the DC voltage Vdc during normal operation and rescue operation has a timing waveform as shown in FIG.

Thus, the inverter DC voltage during rescue operation is a DC voltage V lower than the voltage Vd cl during normal operation.
If the resistor R1 is set so that the DC voltage Vdc2 becomes equal to or lower than the voltage value of the storage battery 11, the voltage will not be supplied to the storage battery 11 by the DC voltage Vdc2.

According to this embodiment, even if the inverter control device is shared during rescue operation and normal operation, by switching the DC voltage detection level depending on the rescue operation and normal operation, the inverter control device can be used in the regeneration mode of the elevator. Since the regenerative voltage can be appropriately suppressed within the voltage range of the storage battery 11, no overvoltage is applied to the storage battery 11, and damage to the storage battery 11 can be prevented.

In addition, since the conventional regenerative voltage setting value is different during normal operation and rescue operation, two inverter devices are used, but in this embodiment, only one inverter device is used, so the elevator control device The configuration can be simplified and costs can be reduced thereby.

Note that the present invention is not limited to the embodiments described above, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[Effects of the Invention] According to the present invention, in an elevator control device that drives an elevator, the detection level of DC voltage can be switched between rescue operation and normal operation by using one inverter device and a switching command from the switching means. When the elevator is operated in regenerative mode, the regenerative voltage of the elevator can be appropriately suppressed within the voltage range of the DC power supply, so that no abnormal voltage is applied to the DC power supply. As a result, even if one inverter device is shared during normal operation and rescue operation, damage to the DC power supply device can be prevented. Furthermore, although two inverter devices have conventionally been used, the configuration of the elevator control device can be simplified by using one inverter device, and an elevator control device that can reduce costs can be provided.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a schematic configuration of an elevator control device according to the present invention, FIG. 2 is a diagram showing an embodiment of a regenerative voltage detection circuit according to the present invention, and FIG. 3 is a diagram showing a direct current during normal operation and rescue operation. FIG. 4 is a timing chart showing the waveform of the voltage Vdc, and is a schematic configuration diagram showing an example of an elevator control device that is equipped with a rescue operation device during a power outage and uses an inverter. l...Three-phase AC power supply, 2...Magnetic contactor, 3...
Converter, 4... Smoothing capacitor, 5... Resistor,
9... Rescue operation device, 14... Regenerative voltage detection circuit,
IO, 17, 21...Magnetic contactor, 22...Rescue operation switching circuit, 22a...Rescue operation switching signal, 23...
- Regenerative voltage detection circuit, 24... Transistor drive power supply, 27... Constant voltage diode, 32.33... Changeover switch. Applicant's agent Patent attorney Takehiko Suzue Figure 2 oc Figure 3 Figure 4

Claims (1)

[Claims] The elevator is powered by an inverter equipped with a regenerative energy absorption circuit that detects regenerative energy during elevator operation as a DC voltage, and when this detected voltage exceeds a predetermined detection level, causes the increased DC voltage to be consumed by a load connected to the DC circuit. an elevator control device that controls a DC power supply device that is connected to the inverter DC circuit during a power outage; a first detection level that is provided in the energy absorption circuit and detects a rise in DC voltage due to regenerated energy during normal operation; A second detection level for detecting a rise in DC voltage due to regenerated energy during rescue operation is set to be switchable, and when the voltage of the inverter DC circuit exceeds the second detection level during rescue operation, the voltage increase is detected. regenerative voltage detection means for causing the load to consume the voltage of the DC circuit to suppress the voltage of the DC circuit within the voltage range of the DC power supply device; An elevator control device comprising: rescue operation switching means for outputting a switching command to switch to a level.