JP2007331851A - Elevator control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accomplish enhancement of working efficiency and insurance of safety in maintenance/inspection work in an elevator control device provided with a charging/discharging circuit for charging regeneration power generated in regeneration operation of an electric motor to a battery and feeding discharging power of the battery to the electric motor. <P>SOLUTION: The elevator control device is provided with an electric motor drive circuit for an elevator provided with a converter 102 for rectifying AC power from a commercial power source to output DC power and an inverter 104 for converting DC power of the converter to AC power to drive the electric motor; a battery charging/discharging circuit 3 for connecting a DC side connection point of the converter and the inverter and the battery 3, charging the regeneration power to the battery in regeneration operation of the electric motor by the inverter and feeding the drive power from the battery in drive operation of the electric motor by the inverter; and a safety circuit 4 provided with a contact 101b for performing opening/closing interlocked with opening/closing of a breaker 101 inserted between the commercial power source and the converter, and contactors 201, 202 for opening the charging/discharging circuit on release of the contact. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an elevator control device, and more particularly to an elevator control device including a circuit that charges a battery with regenerative power of an electric motor.

  2. Description of the Related Art In recent years, along with the long life and high performance of a battery, an elevator control apparatus that charges a battery with regenerative power generated by a motor during regenerative operation and discharges the motor during power running operation to perform drive control has become widespread.

  For example, as shown in FIG. 4, such a control device is connected to a commercial power source 5 through a circuit breaker 101 and a converter 102 and an inverter 104, and drives the elevator motor 6 through the inverter 104. The input terminal of the control power source 103 for controlling the inverter 102, the inverter 104, and the like is connected to the DC unit 7 that connects the converter 102 and the inverter 104.

  The regenerative power during the regenerative operation of the elevator motor 6 is, as shown in “battery charging path” in FIG. 4, from the DC unit 7 connecting the converter 102 and the inverter 104, the circuit breaker 112 in the power charge / discharge circuit 2, The battery 3 is charged via the switching element 204, the reactor 203, and the circuit breaker 113.

During the power running operation of the elevator motor 6, as shown in the “battery discharge path” in FIG. 4, the discharge power of the battery 3 passes through the circuit breaker 113, the reactor 203, the switching element 204, and the circuit breaker 112. 7 and drives the elevator motor 6 via the inverter 104 (see Patent Document 1).
JP 2001-139243 A

  In this way, the motor drive circuit that supplies power from the commercial power source 5 to the elevator motor via the converter 102 during driving, the regenerative power generated during the regenerative operation is charged to the battery, and the discharge power of the battery 3 is used as the electric motor 6. The elevator control device including the charging / discharging circuit 2 that is supplied to and driven by the power source has two power sources of a commercial power source and a battery.

  For this reason, it is necessary to shut off both of the two power sources in order to ensure safety during operations such as maintenance and inspection.

In particular, as in a device that does not have a machine room at the top of the elevator hoistway (machine room-less elevator), an electric motor drive circuit, a battery charging / discharging circuit, a battery, and a circuit breaker are arranged vertically along the side of the hoistway. In an apparatus in which the devices are distributed, the operator is required to operate the circuit breaker while moving on the elevator car. For this reason, the work load increases and the work efficiency decreases.
The present invention has been made in view of these problems, and includes a charge / discharge circuit that charges a battery with regenerative power generated during regenerative operation of an elevator motor and supplies discharge power of the battery to the elevator motor. In an elevator control device, an elevator control device capable of improving work efficiency at the time of maintenance / inspection work and ensuring worker safety is provided.

  In order to solve the above problems, the present invention employs the following means.

  A converter that rectifies AC power from a commercial power source and outputs DC power; and an elevator motor drive circuit that includes an inverter that drives the elevator motor by converting DC power output from the converter into AC power; and A DC side connection point connecting the converter and the inverter is connected between the battery, the battery is charged with regenerative power during the regenerative operation of the electric motor by the inverter, and a part of the drive power is driven during the driving operation of the electric motor by the inverter. A battery charge / discharge circuit supplied from the battery, a contact that opens and closes in conjunction with opening / closing of a circuit breaker inserted between the commercial power source and the converter, and a contactor that opens the charge / discharge circuit when the contact is released. A safety circuit is provided, and the charge / discharge circuit is opened when the circuit breaker inserted between the commercial power source and the converter is opened. To prevent the risk of electrical shock to cause.

  Since the present invention has the above-described configuration, in an elevator control device including a charge / discharge circuit that charges a battery with regenerative power generated during a regenerative operation of the elevator motor and supplies discharge power of the battery to the elevator motor. Thus, it is possible to provide an elevator control device capable of improving work efficiency during maintenance / inspection work and ensuring worker safety.

  Hereinafter, the best embodiment will be described with reference to the accompanying drawings. FIG. 1 is a diagram illustrating an elevator control device according to an embodiment of the present invention.

  As shown in FIG. 1, a converter 102 and an inverter 104 are connected to the commercial power supply 5 via a circuit breaker 101, and the elevator motor 6 is driven via the inverter 104. The input terminal of the control power source 103 for controlling the inverter 102, the inverter 104, and the like is connected to the DC unit 7 that connects the converter 102 and the inverter 104.

  The regenerative power during the regenerative operation of the elevator motor 6 is, as shown in the “battery charging path” in FIG. 1, from the DC unit 7 connecting the converter 102 and the inverter 104, the circuit breaker 112 in the power charge / discharge circuit 2, The battery 3 is charged via the contact 202b of the contactor 202, the switching element 204, the reactor 203, the contact 201b of the contactor 201, and the circuit breaker 113. Switching element 204 and reactor 203 constitute a step-up / step-down chopper circuit.

  During the power running operation of the elevator motor 6, as shown in the “battery discharge path” in FIG. 1, the discharge power of the battery 3 is the circuit breaker 113, the contact 201 b of the contactor 201 in the power charge / discharge circuit 2, and the reactor 203. , The switching element 204 and the circuit breaker 2 are supplied to the DC unit 7 connecting the converter 102 of the control unit 1 and the inverter 104, and the elevator motor 6 is driven through the inverter 104.

  The contacts 201b and 202b of the contactor are opened and closed in conjunction with each other under the control of the safety circuit 4 described later. The safety circuit 4 monitors the opening / closing of the circuit breaker 101. When the circuit breaker 101 is opened, the safety circuit 4 opens the contactors 201b and 202b in conjunction therewith.

  FIG. 2 is a diagram for explaining the details of the safety circuit 4. 2, positive and negative power supplies V (+) and V (−) shown in the figure are supplied from the control power supply 103 of FIG. In FIG. 2, 101 b is an auxiliary contact of the circuit breaker 101 shown in FIG. 1 and opens and closes in conjunction with opening and closing of the circuit breaker 101.

  A coil 401a is excited when the auxiliary contact 101b of the circuit breaker 101 is closed to close the contacts 401b and 401c.

  Each of 201a and 202a is a coil, and the coil 201a is connected to the positive and negative power sources V (+) and V (−) through the contact 401b. The coil 202a is connected to the positive and negative power sources V (+) and V (−) through the contact 401c.

  The coil 201a closes the contact 201b when excited through the contact 401b. Further, the coil 202a closes the contact 202b when excited through the contact 401c. The coil 201a opens the contact 201b when the contact 401b is opened and the excitation current is interrupted. The coil 202a opens the contact 202b when the contact 401c is opened and the excitation current is interrupted.

  For this reason, when the circuit breaker 101 is opened, the auxiliary contact 101b of the circuit breaker 101 is opened and the current supplied to the coil 401a is lost. For this reason, the contacts 401b and 401c are opened. As a result, the coil 201a that drives the contact 201b of the contactor 201 that connects the power charge / discharge circuit 2 and the battery 3, and the coil that drives the contact 202b of the contactor 202 that connects the power charge / discharge circuit 2 and the DC unit. The current supplied to 202a is lost, and the contact 201b and contact 202b are opened.

  Therefore, when the circuit breaker 101 is opened during maintenance and inspection, the contact 401b and the contact 401c are opened in conjunction with the circuit breaker 101 being opened. Further, when the circuit breaker 101 is closed at the end of the maintenance inspection, the contact 401b and the contact 401c are closed in conjunction with the circuit closing of the circuit breaker 101, so that the work efficiency during the maintenance / inspection work is improved. Can be secured.

  FIG. 3 is a diagram for explaining the operation of the safety circuit in the elevator control device. When the elevator control device breaks down for some reason, or during maintenance / inspection work, etc., the circuit breaker 101 is shut off automatically or manually (S31, S32).

  When the circuit breaker 101 is interrupted, the auxiliary contact 101b of the circuit breaker 101 is also opened in conjunction with this (S33). As a result, the current supply to the four coils 401a in the safety open circuit that drives the contacts 401b and 401c is cut off, and the contacts 401b and 401c are opened (S34, S35).

  When the contact 401b and the contact 401c are opened, the current supply to the coil 201a that drives the contact 201b and the coil 202a that drives the contact 202b is stopped (S36). As a result, the contacts 201b and 202b are opened.

  That is, when the circuit breaker 101 connecting the commercial power source 5 and the electric motor drive circuit 1 is opened, the contact 401b and the contact 401c of the safety open circuit 4 are opened. Further, when the contact 401b and the contact 401c are opened, the contact 201b of the contactor 201 and the contact 202b of the contactor 202 are opened. For this reason, the power charging / discharging circuit 2 can be simultaneously disconnected from the battery 3 and the one DC portion of the motor drive circuit.

  In addition, as a circuit breaker 101,112,113 and the contactors 201 and 202, a general purpose circuit breaker and a general purpose electromagnetic contactor can be used.

  As described above, according to this embodiment, a converter that converts AC power from a commercial power source into DC power, an inverter that converts DC power output from the converter into AC power, and drives an elevator motor; The DC-side connection point between the converter and the inverter and a battery are connected, the regenerative power is charged to the battery during the regenerative operation of the motor by the inverter, and the drive power is supplied from the battery during the drive operation of the motor by the inverter In an elevator control device having a charging / discharging circuit for connecting / disconnecting the charging / discharging circuit to / from the battery and the DC unit 7 in conjunction with an opening / closing operation of a circuit breaker connecting the commercial power source and the elevator control device. can do. For this reason, the work efficiency at the time of maintenance / inspection work can be improved, and the safety of the worker can be ensured. Moreover, the power charge / discharge circuit and the battery can be instantaneously disconnected by interrupting the circuit breaker when an abnormality occurs.

  Further, the contact 201b of the contactor 201 and the contact 202b of the contactor 202 are connected so as to be subordinate to the circuit breakers 113 and 112. For this reason, even if it goes to the position where the circuit breakers 113 and 112 are arranged and does not open / close the circuit breakers 113 and 112, it only needs to open / close the circuit breaker 101 that connects between the commercial power supply and the elevator control device. In conjunction with the opening / closing operation, the charge / discharge circuit can be connected to or disconnected from the battery and the DC unit 7. For this reason, in this embodiment, the motor drive circuit and the battery charge / discharge in the vertical direction along the side surface of the hoistway as in an apparatus (machine room-less elevator) that does not have a machine room at the top of the elevator hoistway or the like. The effect is great when applied to a device in which circuits, batteries, circuit breakers, etc. are distributed. Thus, safety and work efficiency can be improved as compared with a normal interlock mechanism that opens and closes in conjunction with the circuit breaker.

It is a figure explaining the elevator control device concerning the embodiment of the present invention. It is a figure explaining the detail of a safety circuit. It is a figure explaining operation | movement of the safety circuit in an elevator control apparatus. It is a figure explaining the conventional elevator control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor drive circuit 101 Circuit breaker 101b Auxiliary contact 102 Converter 103 Control power supply 104 Inverter 112, 113 Circuit breaker 2 Power charge / discharge circuit 201, 202 Contactor 203 Reactor 204 Switching element 3 Battery 4 Safety circuit 5 Commercial power supply 6 Motor 7 DC section

Claims (4)

A converter that rectifies AC power from a commercial power source and outputs DC power, and an elevator motor drive circuit that includes an inverter that drives the elevator motor by converting DC power output by the converter into AC power;
A connection point between the DC side connecting the converter and the inverter is connected to the battery, the battery is charged with regenerative power during the regenerative operation of the electric motor by the inverter, and the drive power is supplied to the battery during the driving operation of the electric motor by the inverter. A battery charge / discharge circuit supplied from
An elevator control comprising a safety circuit including a contact that opens and closes in conjunction with opening and closing of a circuit breaker inserted between the commercial power source and the converter, and a contactor that opens the charge / discharge circuit when the contact is released. apparatus. The elevator control device according to claim 1.
The elevator control apparatus, wherein the charge / discharge circuit is a step-up / down chopper circuit including a switching element and a reactor. The elevator control device according to claim 2,
The contactor that opens the charge / discharge circuit when the contact that opens and closes in conjunction with opening and closing of the circuit breaker is provided on the battery side or the DC side connection point side of the DC voltage adjusting circuit. Control device. The elevator control device according to claim 1.
An elevator control device, wherein the electric motor drive circuit, the charge / discharge circuit, the battery, and the circuit breaker are arranged vertically along the side surface of the hoistway.

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