JP4154908B2 - AC elevator power supply - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a power supply device for an AC elevator.
[0002]
[Prior art]
Recently, the applicant proposed in Japanese Patent Application No. 2000-394735 a power supply device for an AC elevator capable of energy saving operation.
[0003]
That is, as shown in FIG. 2, the power supply circuit 10 having the battery E is provided in addition to the commercial power supply 1 and the regenerative power is absorbed by the battery E of the power supply circuit 10 during the regenerative operation of the inverter 3, while Electric power is supplied from both the commercial power supply 1 and the power supply circuit 10.
[0004]
As shown in FIG. 3, the operation of the power supply circuit is such that the input voltage Vab (DC stage voltage) of the inverter 3 follows a predetermined voltage command (a voltage higher than the full-wave rectified voltage by the converter 2). negative feedback control is performed at all times, transistor T _r1 and T _r2 is turned configured to oN-OFF alternately by the control circuit 9.
[0005]
Here, the reason why the limiter 20 is inserted in the forward-facing element of the control system is to limit the discharge / inflow current of the battery E so that the battery E is not heated or damaged.
[0006]
In general, the capacity of the battery E is determined to be an amount and number of regenerative electric power that can be absorbed during the descending constant speed operation in the rated load state of the elevator in order to suppress the cost as much as possible.
[0007]
[Problems to be solved by the invention]
However, if the capacity of the battery E is limited in this way, it is not possible to supply all of the power of the heavy load, such as when the rated load rises, from the battery E alone. Even if the speed is decelerated immediately, it takes too much time to obtain the power consumption that can be supplied, leading to a decrease in the input voltage of the inverter 3 and the possibility of operation failure.
[0008]
The present invention has been made in view of the above points, and an object of the present invention is to provide a power supply device for an AC elevator that does not stop halfway under any load state.
[0009]
[Means for Solving the Problems]
The present invention is provided with a commercial power source, an inverter that operates with power from the commercial power source to generate AC power, and an electric motor that is driven by AC power generated by the inverter, and can be charged / discharged By controlling the battery, a charge / discharge circuit for charging and discharging the battery, and the operation of the charge / discharge circuit, the input voltage to the inverter is controlled with a predetermined voltage command as a target value. And a control circuit including a limiter circuit that limits the deviation between the input voltage of the inverter and its voltage command, and charging the battery with regenerative power from the motor, and generating the generated power of the battery In the AC elevator supplied to the inverter, a detecting means for detecting a power failure of the commercial power supply is provided, and after the power failure is detected by the detecting means, a predetermined power is detected. Period of, those comprising means for pulling the limiter value of the limiter circuit.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention relaxes restrictions on the discharge current for a predetermined time after a power failure occurs.
[0011]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an overall view of a power supply apparatus showing an embodiment of the present invention, FIG. 4 is a flowchart showing the operation of the present invention, and FIG. 5 is a control block diagram according to the present invention.
[0012]
In the figure, the same reference numerals as those in FIGS. 2 and 3 denote the same components, but 30 is a power failure detection device that detects a power failure of the commercial power source 1 and outputs an output 30a when a power failure is detected. 31 is a timer that outputs the output 30a from the power failure detection device 30, that is, a timer that outputs the signal 31a to the control circuit 9 until a predetermined time T after the detection of the power failure, and when this signal 31a is input to the control circuit 9, FIG. 5, the limiter 40 according to the present invention shown in FIG. 5 raises the electric power that can be supplied from the battery E to the inverter 3, that is, the current limiter value on the side that promotes the discharge from the battery E.
[0013]
In this way, when a power failure occurs, the operation of the elevator car is controlled as shown in FIG. That is, if a power failure occurs while the elevator car is traveling at the rated speed V1, the vehicle is immediately decelerated toward a predetermined low speed V2. In this case, during the normal current limiter value I ₁ for a predetermined time T, to enhance the I _2. Then, since the electric power that can be supplied from the battery E can be temporarily increased, it is possible to prevent a shortage of electric power necessary for the operation of the elevator car. In addition, since the limiter value is increased only during the predetermined time T, even if a failure occurs in which the elevator car does not decelerate, it returns to the normal limiter value after the predetermined time T elapses. Problems that cause heating and breakage are avoided.
[0014]
In the above description, an example in which the limiter value is changed to solve the problem has been described. However, this may be any means or method that relaxes the conditions for restricting discharge from the battery. Needless to say, it is not limited to.
[0015]
【The invention's effect】
As described above, according to the present invention, the regulation means that regulates the discharge current from the battery during normal operation is relaxed for a predetermined time when a power failure occurs. You can continue driving and land immediately on the nearest floor to rescue passengers.
[Brief description of the drawings]
FIG. 1 is an overall view of a power supply device showing an embodiment of the present invention.
FIG. 2 is an overall view showing a power supply device in a conventional AC elevator.
FIG. 3 is a block diagram of a control system in FIG. 2;
FIG. 4 is a flowchart showing the operation of the present invention.
FIG. 5 is a control block diagram according to the present invention.
FIG. 6 is a signal waveform diagram according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Commercial power supply 3 Inverter 9 Control circuit 10 Power supply circuit 20, 40 Limiter 30 Power failure detection device 31 Timer E Battery T Predetermined time

Claims (1)

A battery that can be charged / discharged by providing a commercial power source, an inverter that operates by power from the commercial power source to generate AC power, and an electric motor that is driven by AC power generated by the inverter; A charging / discharging circuit for charging and discharging the battery, and controlling an operation of the charging / discharging circuit to control an input voltage to the inverter with a predetermined voltage command as a target value; and the inverter And a control circuit including a limiter circuit that limits the deviation between the input voltage of the motor and its voltage command , charging the battery with regenerative power from the motor, and supplying the generated power of the battery to the inverter in AC elevator which is provided with detection means for detecting a power failure of the quotient power after a power failure detection by the detecting means, for a predetermined time, Power supply AC elevator, characterized in that it comprises means for pulling the limiter values of the serial limiter circuit.

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