JP2010247918A - Emergency power supply unit of elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an emergency power supply unit of an elevator capable of preventing unnecessary discharging of an emergency battery when a power failure state, in which a power supply from a main power source is shut off, continues for a long period of time. <P>SOLUTION: This emergency power supply unit of an elevator includes a plurality of backup equipment 11-14 which need to be actuated in power failure, a battery 7 electrically connected to all of the backup equipment 11-14 and supplying power to all of the backup equipments 11-14 in power failure, a timer 17 for measuring lapse of a predetermined time after the power failure is detected, and a shut-off circuit installed between the battery 7 and all of the backup equipment 11-14, and completely disconnecting the battery 7 from all of the backup equipment 11-14 when the timer 17 measures the elapse of a predetermined time after the power failure is detected. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an emergency power supply device for an elevator.

  In conventional elevator emergency power supplies, emergency batteries and power outages are used to release the hoisting machine brakes in an emergency, as a result of consolidating emergency batteries and reducing equipment installation and maintenance costs. A plurality of backup devices (loads) such as lights and intercoms that need to be operated in the event of a power failure are connected to each other, and a plurality of timers that operate in a timed manner after a power failure is detected between the emergency battery and the plurality of backup devices. A plurality of switching circuits for turning on / off power supply from the emergency battery to each of the plurality of backup devices based on the output of each of the plurality of backup devices. A voltage supplied from the emergency battery between the circuit and the emergency battery; By providing a plurality of DC / DC converters corresponding to each of the plurality of backup devices, power is also supplied from the emergency battery to the plurality of backup devices in the event of a power failure. What is supplied is known (see, for example, Patent Document 1).

JP 2004-123352 A

  However, in the conventional elevator emergency power supply device disclosed in Patent Document 1, the emergency battery and the DC are connected even after the switch is turned off by the timed operation of the timer and the power supply to the backup device is cut off. If the power supply from the main power supply is cut off for a long period of time, the connection with the DC / DC converter is maintained and the DC / DC converter consumes standby power. If the emergency battery continues to discharge and becomes overdischarged, the battery may eventually deteriorate, or even if the battery does not deteriorate, There is a problem that much time is required for charging (voltage recovery at the charger).

  In addition, when the power failure from the main power supply is interrupted for a long period of time, the power failure state continues for a long period of time. Depending on the circumstances, the main power supply may be shut off for a long period of time. In this case, especially in elevators that do not have a machine room, a battery shutoff switch that shuts off the power supply from the emergency battery to the backup device is installed in the hoistway. In many cases, the battery cut-off switch cannot be easily accessed, and the battery discharge may proceed, so that the above-described problem is remarkable.

  The present invention has been made to solve such a problem, and unnecessary progress of discharge of an emergency battery in a case where a power failure state in which the power supply from the main power source is cut off for a long period of time continues. Thus, an emergency power supply apparatus for an elevator that can prevent the above is obtained.

  In the elevator emergency power supply apparatus according to the present invention, a plurality of backup devices that are required to operate during a power failure and all the plurality of backup devices are electrically connected to each other during the power failure. Provided between the battery to be fed, a timed timer for measuring the elapse of a predetermined time after detection of a power failure, and between the battery and all of the plurality of backup devices, and when the timed timer measures the elapse of a predetermined time after detection of the power failure A shut-off circuit that completely disconnects the battery from all of the plurality of backup devices.

  In the emergency power supply apparatus for an elevator according to the present invention, it is possible to prevent unnecessary progress of the discharge of the emergency battery when a power failure state in which power supply from the main power supply is interrupted for a long period of time continues. There is an effect that can be.

1 is a block diagram showing an overall configuration of an emergency power supply apparatus for an elevator according to Embodiment 1 of the present invention. It is a circuit diagram which shows the internal structure of the interruption | blocking circuit which concerns on Embodiment 1 of this invention. It is a figure which shows the time-sequential change of the voltage in each part of the emergency power supply device of the elevator which concerns on Embodiment 1 of this invention. It is a block diagram which shows the whole structure of the emergency power supply device of the elevator which concerns on Embodiment 2 of this invention.

  The present invention will be described with reference to the accompanying drawings. Throughout the drawings, the same reference numerals indicate the same or corresponding parts, and redundant description thereof will be simplified or omitted as appropriate.

Embodiment 1 FIG.
1 to 3 relate to Embodiment 1 of the present invention, FIG. 1 is a block diagram showing the overall configuration of an emergency power supply device for an elevator, FIG. 2 is a circuit diagram showing the internal configuration of a cutoff circuit, and FIG. These are figures which show the time-sequential change of the voltage in each part of the emergency power unit of an elevator.

In the figure, reference numeral 1 denotes an elevator control panel that controls the overall operation of the elevator including the operation of an elevator car 2 that is disposed so as to be freely raised and lowered in a hoistway (not shown).
The elevator is normally operated by receiving supply of a three-phase AC voltage from the commercial three-phase AC power source 3, and the three-phase AC voltage from the commercial three-phase AC power source 3 is stored in the elevator control panel 1. After being converted into a desired three-phase AC voltage by the provided inverter 4, it is output to the drive motor 5 that drives the operation of the elevator, that is, the raising / lowering of the elevator car 2. Between the commercial three-phase AC power supply 3 and the inverter 4, a main power cut-off switch 6 comprising a circuit breaker such as a so-called no-fuse breaker that automatically cuts off the electric circuit when an overcurrent flows is provided. .

The elevator control panel 1 includes a battery 7 that is an emergency power source for supplying power to backup devices (devices / loads that need to operate in the event of a power failure), which will be described later, when the commercial three-phase AC power source 3 is shut off or a power failure occurs. It has been.
This battery 7 uses electric power supplied from the commercial three-phase AC power source 3 by the charger 9 provided in the elevator control panel 1 at the normal time, that is, when the commercial three-phase AC power source 3 is not cut off or cut off. Is charged. Between the battery 7 and the charger 9, a battery power cut-off switch 8 comprising a wiring breaker and the like is provided in the same manner as the main power cut-off switch 6. A first reverse blocking diode 10a is provided between the battery 7 and the charger 9, and the reverse current from the battery 7 to the charger 9 is blocked by this.

In the elevator car 2, there are installed a blackout lamp 11 for providing the minimum lighting when the power in the car is turned off due to a power failure, and an interphone 12 for a user in the elevator car 2 to talk to the outside. Has been.
The elevator car 2 is provided with a power supply processing circuit 13 that generates a desired voltage from the power supplied from the battery 7 and performs on / off control of the power supply. Necessary power is supplied from the power supply processing circuit 13.

Further, in the elevator hoistway, there is provided an earthquake detector 14 for shifting the elevator to an earthquake control operation when an earthquake having an acceleration of a predetermined level or more is detected. It operates with the power supplied by the battery 7.
The blackout lamp 11, the intercom 12, the power supply processing circuit 13, and the earthquake detector 14 are backup devices that are loads that need to operate during a power failure.

Between all these backup devices and the battery 7, a shut-off circuit 15 disposed in the elevator control panel 1 is provided. In other words, there is no backup device that should operate during a power failure between the battery 7 and the cutoff circuit 15.
Further, in the elevator control panel 1, a power failure occurs based on the detection result of the power failure detection circuit 16 and the power failure detection circuit 16 that detects the occurrence of power failure by detecting the loss of power supply from the commercial three-phase AC power source 3. A timed timer 17 is provided for measuring a time elapsed from the time and outputting a battery shutoff signal when a predetermined time elapses. The shutoff circuit 15 measures the elapse of a predetermined time from the occurrence of a power failure by the timed timer 17. When the output battery cutoff signal is received, the electric circuit connecting the battery 7 and all the backup devices is completely disconnected, and the power supply from the battery 7 to all the backup devices is shut off.

The internal circuit of the interruption circuit 15 is configured as shown in FIG. 2, for example.
That is, in the figure, 10b, 10c, and 10d are second, third, and fourth reverse blocking diodes for preventing reverse current, and 18a, 18b, and 18c are voltages applied to the gates of MOSFETs or the like, for example. Are first, second and third semiconductor switches composed of field-effect transistors which are turned on and current flows between the source and drain. Reference numerals 19a, 19b, 19c, 19d, and 19e denote first, second, third, fourth, and fifth resistors, respectively.
Reference numeral 20 denotes a power supply circuit that generates a DC voltage by using the battery 7 voltage as an input. The DC power generated by the power supply circuit 20 serves as a control power supply 21 for operating the power failure detection circuit 16 and the timed timer 17. . Reference numeral 22 denotes a smoothing capacitor for smoothing the output of the control power source 21.

In the interruption circuit 15, the output of the charger 9 is connected to the negative electrode of the battery 7 via the first resistor 19a, the second reverse blocking diode 10b, and the second resistor 19b.
The gate of the first semiconductor switch 18a is connected between the second reverse blocking diode 10b and the second resistor 19b. The source of the first semiconductor switch 18a is connected to the negative pole of the battery 7, and the drain of the first semiconductor switch 18a. Are connected to the gate of the second semiconductor switch 18b through a third resistor 19c.

The source of the second semiconductor switch 18b is connected to the positive pole of the battery 7, and the drain is an output of the positive pole of the cutoff circuit 15 via the third reverse blocking diode 10c. Further, the gate and the source (the positive electrode of the battery 7) of the second semiconductor switch 18b are connected by the fourth resistor 19d.
The drain of the second semiconductor switch 18b is connected to the gate of the first semiconductor switch 18a via the fifth resistor 19e and the fourth reverse blocking diode 10d, thereby forming a self-holding circuit. .

The gate of the first semiconductor switch 18a is connected to the drain of the third semiconductor switch 18c that receives the battery cutoff signal output from the time timer 17 as a gate input. The source of the third semiconductor switch 18c is It is connected to the negative pole of the battery 7.
A power supply circuit 20 that generates a control power supply 21 from the voltage of the battery 7 is connected between the + and-poles of the output of the shut-off circuit 15. A smoothing capacitor 22 is inserted between the negative electrode and the negative electrode).

  The first semiconductor switch 18a and the third semiconductor switch 18c are N-channel FETs, and the second semiconductor switch 18b is a P-channel FET.

  FIG. 3 is a diagram showing a time-series change in voltage in each portion A to E of the emergency power supply device according to this embodiment. In FIG. 3, a commercial three-phase AC power supply voltage A, a charger output B, a battery voltage C, a timer output D, and a cutoff circuit output E are voltage waveforms at locations indicated by the same symbols in FIG.

At the normal time, that is, both the main power cutoff switch 6 and the battery power cutoff switch 8 are turned on, and the three-phase AC voltage is supplied from the commercial three-phase AC power source 3 (the commercial three-phase AC power source voltage at the normal time). A).
Therefore, the charger 9 generates an output voltage by the commercial three-phase AC power supply voltage A (charger output B in a normal state), and in the cutoff circuit 15, the first resistor 19a and the second reverse blocking diode 10b. Then, a voltage is applied to the gate of the first semiconductor switch 18a via the second resistor 19b, and the first semiconductor switch 18a is turned on.

  When the first semiconductor switch 18a is turned on, a circuit connected from the battery 7+ pole to the battery 7-pole via the fourth resistor 19d and the third resistor 19c is closed, and the gate of the second semiconductor switch 18b is closed. The voltage is applied to turn on the second semiconductor switch 18b, and the cutoff circuit 15 generates an output voltage.

  Once the second semiconductor switch 18b is turned on, the battery 7 + pole, the fifth resistor 19e, the fourth reverse blocking diode 10d, the second resistor 19b, and the battery 7-pole circuit are closed. Since the voltage continues to be applied to the gate of the first semiconductor switch 18a, the ON state of the first semiconductor switch 18a and the second semiconductor switch 18b is maintained and the state in which the cutoff circuit 15 generates the output voltage is continued ( Power is supplied to backup devices such as the interruption circuit output E) and the blackout lamp 11 under normal conditions.

In this state, when the power failure of the commercial three-phase AC power supply 3 occurs or only the main power cut-off switch 6 is cut off, the commercial three-phase AC power supply voltage A disappears, and then the charger output B also disappears.
Even if the charger output B disappears, the second semiconductor switch 18b is held by itself and the on-state continues, so that the interruption circuit output E does not disappear and the voltage can be continuously output to supply power to the backup device. Maintained. For this reason, the battery voltage C gradually decreases slowly as the backup device consumes electric power. When this state continues for a long time, the voltage continues to decrease as shown by the broken line of the battery voltage C in FIG. 3, and after a certain point in time, the battery 7 is overdischarged and the voltage rapidly decreases to reach the discharge end voltage. The battery 7 may be deteriorated.

However, when the power failure detection circuit 16 detects the voltage loss of the commercial three-phase AC power supply 3 and the occurrence of the power failure is detected, the timer output D in FIG. A battery cutoff signal is output from the time timer 17 as a pulse voltage.
Then, a voltage is applied to the gate of the third semiconductor switch 18c by the timer output D to turn on the third semiconductor switch 18c, so that the first semiconductor switch 18a is turned off, and then the second semiconductor switch 18c is turned on. The switch 18b is also turned off.

  Accordingly, the voltage of the cutoff circuit output E disappears, and power supply from the cutoff circuit 15 to all backup devices is stopped. That is, the connection between the battery 7 and all the backup devices is completely disconnected, the battery 7 does not consume power, and the voltage does not decrease as shown by the solid line of the battery voltage C in FIG. It is suppressed.

  In this state, when the commercial three-phase AC power source 3 recovers from a power failure and recovers, or when the main power cut-off switch 6 is turned on, the commercial three-phase AC power source voltage A is restored, and the charger output B is also restored. Then, since the first semiconductor switch 18a and the second semiconductor switch 18b are turned on, the cutoff circuit output E is restored, and power can be supplied again from the cutoff circuit 15, that is, the battery 7 to the backup device.

  Here, the predetermined time (timer count) from the occurrence of a power failure set in advance in the timed timer 17 to the output of the battery cutoff signal is equal to or longer than the time required for the backup operation of the backup device, and the battery 7 It is set to be equal to or less than the time during which overdischarge can be suppressed.

In the elevator emergency power supply apparatus configured as described above, a battery electrically connected to a plurality of backup devices that need to operate during a power failure supplies power to all the backup devices during a power failure. A mains power supply for a long period of time is provided between all these backup devices by providing a disconnect circuit that completely disconnects the battery from all backup devices when the timed timer measures the elapse of a predetermined time after detecting a power failure. Thus, it is possible to prevent unnecessary progress of battery discharge in the case where a power failure state in which the power supply from the commercial three-phase AC power source is interrupted continues.
Therefore, it is possible to extend the life of the battery and to save power and energy, and to reduce the load on the environment.
In addition, by providing a timed timer and a shut-off circuit in the elevator control panel, the emergency power supply device can have a simple configuration and facilitate maintenance and inspection work.

Embodiment 2. FIG.
FIG. 4 is a block diagram illustrating an overall configuration of an emergency power supply apparatus for an elevator according to Embodiment 2 of the present invention.
In the configuration of the first embodiment described above, the interruption circuit, the power failure detection circuit, and the timed timer are provided in the elevator control panel so that the power supply to all the backup devices is collectively controlled. In the second embodiment, these circuits and timers are provided on each backup device side, and the power supply is controlled individually for each backup device.

Here, an explanation will be given by taking the case of an earthquake detector as a backup device.
That is, 14 is a seismic detector provided in the elevator hoistway to shift the elevator to seismic control operation when a seismic motion exceeding a predetermined level is detected. A function 14a is provided.
This earthquake detection function 14a is a backup device that needs to operate during a power failure, and is connected to a battery 7 that is an emergency power supply provided in the elevator control panel 1.

In addition, between the battery 7 and the earthquake detection function 14a, more precisely, between the charger 9 that charges the battery 7 in the normal time and the earthquake detection function 14a, the same configuration as in the first embodiment is cut off. A circuit 15 is connected.
The output from the charger 9 generated from the commercial three-phase AC power supply 3 is input to the interruption circuit 15 and also input to the power failure detection circuit 16 provided in the earthquake detector 14.

The power failure detection circuit 16 detects the loss of the commercial three-phase AC power supply voltage that is the source of the charger output by detecting the loss of the output voltage from the charger 9, and detects the occurrence of a power failure. Then, the fact is output to the time timer 17 provided in the earthquake detector 14.
Then, the time timer 17 measures the elapsed time from the occurrence of the power failure and outputs a battery cutoff signal to the cutoff circuit 15 when a predetermined time has elapsed. The electric circuit connecting the earthquake sensing function 14a is completely disconnected, and the power supply from the battery 7 is cut off.

Other configurations and operations are the same as those in the first embodiment, and detailed description thereof is omitted.
Also, here, the power failure detection circuit detects the power failure by monitoring the charger output, but monitors the output linked to the commercial three-phase AC power supply voltage, including the method of directly monitoring the commercial three-phase AC power supply voltage. The power failure detection may be performed using other methods.

Furthermore, although the earthquake detector has been described here, the same applies to other backup devices. For power failure lights and intercoms in the elevator car, a shutoff circuit is used to supply power to these devices. What is necessary is just to arrange | position and provide in an elevator car side between an electric power feeding process circuit and a battery.
In this case, when there are a plurality of backup devices, a plurality of cutoff circuits and time limit timers are provided according to the respective backup devices, and from when a power failure occurs preset in these time limit timers until a battery cutoff signal is output. The predetermined time (timer count) may be set individually according to the performance, function, etc. of the backup device in which each timed timer is installed.

In the emergency power supply apparatus for an elevator configured as described above, in addition to being able to achieve the same effects as in the first embodiment, a backup device is provided by providing a timed timer and a cutoff circuit on the backup device side. In the case where a control circuit such as a microcomputer is built in beforehand, an emergency power supply apparatus can be configured easily and inexpensively with a small number of additional parts.
In addition, a plurality of timed timers and shut-off circuits are provided according to a plurality of backup devices, and a predetermined time of each of the plurality of timed timers is set individually for each backup device according to the backup device provided with the timed timer. The time setting can be optimized, and the progress of unnecessary battery discharge can be prevented more effectively.

DESCRIPTION OF SYMBOLS 1 Elevator control panel 2 Elevator car 3 Commercial three-phase alternating current power supply 4 Inverter 5 Drive motor 6 Main power cutoff switch 7 Battery 8 Battery power cutoff switch 9 Charger 10a First reverse blocking diode 10b Second reverse blocking diode 10c Third Reverse blocking diode 10d 4th reverse blocking diode 11 blackout lamp 12 intercom 13 power supply processing circuit 14 earthquake detector 14a earthquake detection function 15 cutoff circuit 16 power failure detection circuit 17 timed timer 18a first semiconductor switch 18b second semiconductor switch 18c third semiconductor switch 19a first resistor 19b second resistor 19c third resistor 19d fourth resistor 19e fifth resistor 20 power supply circuit 21 control power supply 22 smoothing capacitor

Claims (4)

Multiple backup devices that need to operate during a power outage,
A battery that is electrically connected to all of the plurality of backup devices and that supplies power to all of the plurality of backup devices in the event of a power failure;
A timed timer that measures the lapse of a predetermined time after power failure detection,
An interruption circuit provided between the battery and all of the plurality of backup devices, and completely disconnects the battery from all of the plurality of backup devices when the timed timer measures the elapse of a predetermined time after detection of a power failure An emergency power supply device for an elevator.   2. The elevator emergency power supply device according to claim 1, wherein the timed timer and the cutoff circuit are provided in an elevator control panel that controls the overall operation of the elevator.   The emergency power supply apparatus for an elevator according to claim 1, wherein the timed timer and the cutoff circuit are provided on the plurality of backup devices. The timed timer and the cutoff circuit are provided in a plurality according to the plurality of backup devices,
The emergency power supply apparatus for an elevator according to claim 3, wherein the predetermined times of the plurality of time timers are individually set according to the backup device provided with the time timer.

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