JPH0313501Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an elevator control device, and particularly to a charging circuit for a battery provided as an emergency power source.

[Conventional technology and problems]

If a power outage occurs while an elevator is running, the elevator will suddenly stop, potentially causing a so-called canned car accident in which passengers are trapped in the car between floors. For this reason, recently, after a power outage occurs, the emergency power supply is immediately switched on and the car is operated to the nearest floor to prevent canned food accidents from occurring.

By the way, a battery is generally used as an emergency power source in this case, but the amount of electricity stored in a battery decreases rapidly after one use, so it cannot be used even if a power outage occurs. In order to maintain the power, it is necessary to constantly charge the battery. For this reason, in the past, charging was carried out using a dedicated charging circuit, which had the drawback of making the emergency power supply extremely expensive.

[Means for solving problems]

The present invention was devised to solve the above-mentioned problems, and by charging the battery using a motor control device, a battery charging circuit can be constructed at low cost. In other words, in systems such as the inverter control system and the thyristor Leonard system, which have a full-wave rectifier circuit in the elevator drive motor control system, when the elevator is stopped for a relatively long time due to passengers getting on and off and doors opening and closing, The present invention is characterized in that the full-wave rectifier circuit is in a non-operating state, and the battery is charged via the full-wave rectifier circuit every time the elevator stops.

〔Example〕

The figure is an overall configuration diagram showing an embodiment in which the present invention is applied to an inverter control system.

In the figure, R, S, and T are three-phase AC power supplies, 1 is a converter consisting of a full-wave rectifier circuit composed of thyristors, 2 is a DC reactor that smoothes the output current of converter 1, 3 is a variable voltage DC, 4 is an induction motor that drives the elevator; 5 is a speed generator that outputs a speed feedback signal; 6 is a speed command generator that generates a predetermined speed command signal; 7 is a speed command A speed regulator that amplifies and outputs the deviation between the signal and the speed feedback signal, 8
1 is a converter control circuit including a gate circuit for controlling the thyristor of the converter 1; 9 is an inverter control circuit including a gate circuit for controlling the thyristor of the inverter 3; 10 is a battery;
is a voltage detector that detects the voltage of the battery 10,
12 is a voltage command signal that sets the battery voltage; 13 is a charging pressure control circuit that controls the charging pressure to the battery 10 from the voltage command signal 12 and the voltage signal of the voltage detector 11; 20a to 20c are normal 21a is the normally open contact of a relay (not shown) that is energized and de-energized in the event of a power outage, and 21a is the normally open contact of a relay (not shown) that is energized when the elevator is stopped and during control operation during a power outage, and is energized during normal operation of the elevator (stops after operation command). ) is the normally open contact of the deenergizing relay (not shown), 22a
~ 22c is a normally open contact of a relay (not shown) that is energized during normal running and control operation during a power outage, and deenergized when the elevator is stopped, and 23a is energized and runs when the elevator is stopped. Inside is a normally open contact of a deenergized relay (not shown), and 23b is its normally closed contact.

In the above configuration, under normal conditions, the contacts 20a to 2
0c is closed, and when an elevator operation command is issued, contacts 23b and 22a to 22c are closed, contacts 21a and 23a are opened, and the motor 4 is controlled by well-known inverter control according to the speed command signal. It can be done. When the elevator reaches the destination floor and stops, contacts 22a to 22c and contact 2
3b is open, contacts 21a and 23a are closed, and the battery 10 is charged while passengers are getting on and off the vehicle and the door is opening and closing. Battery 10
Charging is performed using the voltage command signal 12 and the voltage detector 11.
The charging voltage control circuit 13 controls the gate circuit in the inverter control circuit 8 while comparing the voltage signals from the converter 1 through the full-wave rectifier circuit of the converter 1.

In this way, the battery is charged every time the elevator stops, and the battery is always maintained in a usable state. As a result, when a power outage occurs, contacts 20a to 20c are opened and contact 21a is closed to switch from commercial power to battery power, and in response to a power outage control operation command, contacts 22a to 22a are closed.
When the circuit 2c is closed, electric power is supplied from the battery 10 to the electric motor 4 via the inverter 3, and the elevator can be operated to prevent accidents involving passengers with canned food.

Although inverter control has been described above, the present invention can be similarly applied to any control device having a full-wave rectifier circuit, such as control of a DC elevator using a thyristor Leonard system.

[Effect of idea]

According to the present invention, since the battery is charged using the full-wave rectifier circuit in the motor control device, the charging circuit can be constructed at a very low cost. Since charging is performed, the battery can always be kept in a usable state.

[Brief explanation of the drawing]

The figure is an overall configuration diagram showing an embodiment of the present invention. R, S, T.... Three-phase AC power supply, 1... Converter, 3... Inverter, 4... Induction motor, 5
...Speed generator, 6...Speed command generator, 7...
Speed regulator, 8...Converter control circuit, 9...
Inverter control circuit, 10...Battery, 11
...Voltage detector, 12...Voltage command signal, 13...
...Charging voltage control circuit.

Claims (1)

[Scope of utility model registration request] Equipped with a battery as an emergency power source in the event of a power outage.
Further, in the elevator control device in which the control device having a full-wave rectifier circuit controls an electric motor to drive the elevator, the battery is charged via the full-wave rectifier circuit every time the elevator stops. An elevator control device characterized by being equipped with a battery charging circuit.