JPS64314B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an elevator operation device during a power outage.

In recent years, inverters have come to be used to control elevator drive motors in order to reduce power consumption, but even in the event of a power outage, a battery can be connected to the DC side of the inverter to control the operation of the elevator during a power outage. It is suggested that driving be carried out.

A specific example is shown in FIG.

In the figure, 1 is a three-phase AC commercial power supply, 2 is a normally open contact of a contactor that is excited when the elevator is running, 3 is a converter that converts three-phase AC voltage to DC voltage, and 4 is a smoother for the output voltage of converter 3. 5 is an inverter that converts DC voltage into variable voltage, variable frequency three-phase AC voltage, 6 is an induction motor for driving the elevator, and 7 and 8 are resistors and transistors for consuming regenerated power from the motor 6. , 9 is a control circuit that controls the transistors of the inverter 5 and the regenerative power consumption transistor 8, 10 is a three-phase transformer that supplies power to the control circuit 9, 11 is a battery for operation during a power outage, and 12 is excited during a power outage. 13 is a diode for supplying power from the battery to the inverter during a power outage, 14 is a control circuit that controls the transistors of the inverter 5 and the transistor 8 by the battery power supply 11 during a power outage, and 15 and 16 are each connected to a power outage. These are the normally open and normally closed contacts of the relay, which are energized at the same time.

In the above configuration, when the commercial power supply 1 is normal, the contacts 12 and 15 are open and the contact 16 is closed, so the inverter 5 generates an output with a frequency and voltage according to the output of the control device 9. When electric power is regenerated from the motor 6, the control device 9 detects this and turns on the transistor 8, causing the resistor 7 to consume the regenerated electric power.

Next, when the commercial power supply 1 is out of power, the contact 16 is opened and the contacts 12 and 15 are closed, so that the output voltage of the battery 11 is applied to the DC side of the inverter 5 via the diode 13, and the output voltage of the battery 11 is applied to the DC side of the inverter 5. and the transistor 8 are controlled by the control device 14 to control the motor 6 during a power outage.

However, in the configuration shown in Fig. 1, the inverter control device includes a commercial power source 9 and a battery power source 14.
Because it is necessary to prepare two components, the configuration is complicated and expensive. Additionally, to protect the inverter, it is usually necessary to have a circuit that detects overvoltage or overcurrent and stops inverter control, but this also requires two circuits, one for commercial power and one for battery power. Ta.

Furthermore, for fine-grained control of the inverter,
A large number of insulated power supplies and regulated voltage power supplies are required, and in the case of a commercial power supply, a large number of insulated power supplies are obtained from the transformer 10, and a rectifier circuit and a constant voltage circuit built into the control device 9 are used. Although the required power is obtained, in order to control the inverter in the same way even during a power outage, you need an isolated DC/
It is necessary to incorporate a DC converter and a constant voltage circuit into the control device 14, and the control device 14 has a very complicated configuration.

The present invention solves the above-mentioned drawbacks, and aims to provide an elevator operating system during a power outage that does not require a particularly complicated inverter control device for operation during a power outage.

FIG. 2 shows an embodiment of the present invention.

In the figure, the parts indicated by the same reference numerals as in FIG. 1 indicate corresponding parts, and therefore their explanation will be omitted. 17 is an inverter that converts the DC voltage from the battery 11 into three-phase AC voltage, 18 is a contact that opens for a certain period of time after a power outage is detected, and 19 and 20 are inserted and connected to the front stage of the three-phase transformer 10, and each is energized at the time of a power outage. These are the normally open and normally closed contacts of a relay.

In the configuration shown in FIG. 2, the operation when the commercial power supply 1 is normal is exactly the same as that shown in FIG. 1. On the other hand, when the commercial power supply 1 experiences a power outage, the contact 12 is closed by power from an emergency standby power supply, etc., and the output voltage of the battery 11 is applied to the DC side of the inverter 5 via the diode 13. The output voltage of the battery 11 is also applied to the DC side, and as a result, the inverter 17 generates a three-phase AC voltage. On the other hand, since the contact 20 is open and the contact 19 is closed, the inverter 1 is connected to the primary side of the transformer 10.
A three-phase AC voltage, which is the output of 7, is applied to supply power to the control device 9. Therefore, the control device 9
is the same as when commercial power supply 1 is normal.
The torque and rotational speed of the motor 6 can be controlled by controlling the transistor 8 for consuming regenerative power.

Note that when a power outage is detected, contact 20 is opened and contact 1 is
2 and 19, the power supply of the control device 9 is in an uncertain state, so the inverter 5 cannot be controlled reliably, resulting in short circuits between the upper and lower arms of the inverter, and on the other hand, overcurrent Protection circuits such as a detection circuit cannot operate reliably, and as a result, the inverter 5 may be damaged.

Therefore, in order to prevent the above-mentioned problem, the output of the control device 9 is disconnected from the inverter 5 by the contact 18 for a certain period of time after a power failure is detected, and the control device 9 is controlled only after the power supply of the control device 9 is sufficiently established by supplying the output from the inverter 17. The output of the device 9 is applied to the inverter 5.

Note that although a means for opening the contact 18 for a certain period of time is not shown, a power outage is detected by a relay or the like, and a timer is activated based on the detection operation to keep the relay having the contact 18 in an energized state for a certain period of time. (or in a non-energized state if the contact 18 is a normally open contact of a relay). However, the mochi theory can also be applied to other configurations.

In the embodiment shown in FIG. 2, the contact 18 is opened for a certain period of time after a power outage is detected, but the same effect can be obtained if the power supply voltage of the control device 9 is detected and the contact is opened when the power supply voltage is not within the normal range. It is clear that a significant effect can be obtained.

As described above, the present invention supplies battery power during a power outage to the first inverter for driving the electric motor, and at the same time converts the power into alternating current using the second inverter provided, and transfers the power to the first inverter.
Since the inverter is used as the drive power source for the control device, the control device can be used both during normal times and during power outages, simplifying the configuration of the device for operation during power outages, and ensuring that the control device is stable. Since the output of the control device is applied to the first inverter when the condition is established, a highly reliable device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit diagram showing a conventional example, and FIG. 2 is an electrical circuit diagram showing an embodiment of the present invention. 3...Converter, 5...First inverter,
6...Electric motor, 9...Control device, 10...Transformer, 11...Battery, 17...Inverter, 1
8...Normally closed contact.

Claims (1)

[Claims] 1 a converter that rectifies a commercial AC power source and converts it into DC; a first inverter that converts the output of the converter into a variable voltage/variable frequency AC voltage to control an induction motor for driving an elevator; A control device that controls an inverter, a transformer that supplies power to the control device, a battery that is connected to the DC side of the inverter during a power outage, and an inverter that converts the output voltage of the battery to AC, a second inverter that supplies its output to the primary side of the transformer to operate the control device in the event of a power outage; and a second inverter that is provided between the control device and the first inverter so that the control device is in a stable state. and means for supplying the output of the control device to the first inverter when the first inverter is established.