JP2012025509A - Elevator control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator control device that can reduce the standby electric power and start up a main-circuit device in a short time from the standby state even if an elevator is in the standby state for a long period of time.SOLUTION: A converter circuit 11 converts an AC power source into a DC voltage. An inverter circuit 13 converts the DC voltage, converted by the converter circuit, into a variable AC voltage for driving the electric motor 14 of an elevator. Smoothing capacitors 15, 16 smooth the DC voltage converted by the converter circuit. First contacts 17, 19 are provided in the respective smoothing capacitors. A control means 21 opens the first contacts when the elevator is in the standby state.

Description

  Embodiments described herein relate generally to an elevator controller such as an elevator, and to a controller that controls an electric motor of the elevator.

  Generally, a main circuit device that controls an elevator motor includes, for example, a converter device that converts a purchased AC voltage into a DC main circuit voltage, and an inverter device that starts the motor by converting the main circuit voltage into a control AC voltage. A smoothing capacitor for smoothing the DC main circuit voltage, a voltage balancing resistor for averaging the voltage sharing of the smoothing capacitor, a main circuit discharge resistor for discharging the main circuit, and switching of the switching elements constituting the inverter device And a snubber capacitor for absorbing the surge voltage generated by.

  2. Description of the Related Art Conventionally, in an elevator main circuit device, when no elevator call is generated and a standby state is established for a long time, two types of control are mainly performed. First, the main circuit device is disconnected from the power purchase side, the DC main circuit voltage is lowered, and the elevator call standby state is set. Second, the main circuit voltage is not dropped, but the DC main circuit voltage is always raised, and the elevator call standby state is set.

  When the standby is performed with the main circuit voltage disconnected, the power consumption of the main circuit device becomes zero. However, when an elevator call occurs, it is first necessary to raise the main circuit voltage. This requires charging the DC main circuit, and thus it takes a certain time to start the elevator drive control.

  On the other hand, when waiting in a state where the main circuit voltage is constantly raised, when an elevator call is generated, it is possible to quickly start control of the elevator. However, the power consumption of the main circuit device in the standby state is not zero, and some standby power is generated.

JP 2004-18620 A

  The present embodiment is intended to provide an elevator control device that can reduce standby power even when the elevator has been in a standby state for a long time and can start the main circuit device in a short time from the standby state. To do.

  An elevator controller according to an embodiment includes a converter circuit that converts an AC power source into a DC voltage, an inverter circuit that converts a DC voltage converted by the converter circuit into a variable AC voltage for driving a motor of the elevator, and the converter A smoothing capacitor for smoothing the DC voltage converted by the circuit; a first contact connected to the smoothing capacitor; and a control means for opening the first contact when the elevator is in a standby state. It is characterized by that.

The circuit diagram which shows the example of the elevator control apparatus which concerns on 1st Embodiment. The flowchart which shows operation | movement of the control part shown in FIG. The circuit diagram which shows the example of the elevator control apparatus which concerns on 2nd Embodiment. The circuit diagram which shows the example of the elevator control apparatus which concerns on 3rd Embodiment. The circuit diagram which shows the modification of 1st Embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
FIG. 1 shows a main circuit device 10 of an elevator control device, for example, an elevator control device, according to a first embodiment.

  In the first embodiment, the voltage balancing resistors 18 and 20 provided in the main circuit device 10 can be disconnected from the main circuit device 10 by the contacts 17 and 19, and when the elevator control enters a standby state, the contact 17 , 19 are opened, and the current flowing through the voltage balancing resistors 18, 20 is deleted.

  That is, in FIG. 1, the input end of the converter circuit 11 is connected to a power purchase AC (not shown) via the wiring 12. The converter circuit 11 converts the purchased AC voltage into a DC main circuit voltage. The inverter circuit 13 is connected between the output terminals of the converter circuit 11, converts the main circuit voltage into a control alternating current, and supplies it to the electric motor 14.

  Smoothing capacitors 15 and 16 are connected in series between the output terminals of the converter circuit 11. One end of a smoothing capacitor 15 is connected to one end of a voltage balancing resistor 18 via a contact 17. The other end of the resistor 18 is connected to a connection node of the smoothing capacitors 15 and 16 through a contact 19. Further, the other end of the resistor 18 is connected to a connection node between the smoothing capacitor 16 and the converter circuit 11 via a voltage balancing resistor 20.

  In the first embodiment, the voltage balancing resistors 18 and 19 also serve as main circuit discharge resistors (discharge circuits). For example, it is assumed that there is no main circuit discharge circuit.

  The contacts 17 and 19 are, for example, electromagnetic relay contacts, and are controlled to open and close in accordance with an output signal from the control unit 21. The control unit 21 controls the entire elevator control device. For example, when the elevator circuit is activated, the main circuit device 10 is activated to activate the motor 14, or the elevator circuit is not generated for a long time. 10 is set to a standby state, and standby power is reduced.

  FIG. 2 shows the operation of the control unit 21. The operation of the main circuit device 10 will be described with reference to FIG.

  When the main circuit device 10 is in the activated state, the contacts 17 and 19 are closed. Therefore, the DC main circuit voltage generated by the converter circuit 11 is smoothed by the smoothing capacitors 15 and 16, and the voltages of the smoothing capacitors 15 and 16 are averaged by the voltage balancing resistors 18 and 20.

  The control unit 21 determines whether there is an elevator call (hereinafter referred to as a hall call) (S1). If there is no hall call, the control unit 21 determines whether a predetermined time has elapsed (S2). As a result, when it is determined that there is no hall call for a certain period of time, the control of the main circuit device 10 is stopped and the contacts 17 and 19 are opened (S3) and set to a standby state. Stopping the control of the main circuit device 10 is, for example, stopping the operation of the converter circuit 11 and the inverter circuit 13. In this standby state, when the contacts 17 and 19 are opened, the voltage balancing resistors 18 and 20 are disconnected from the smoothing capacitors 15 and 16. For this reason, the positive discharge operation of the DC main circuit voltage is stopped, and the charged state of the smoothing capacitors 15 and 16 is maintained.

  When a hall call is detected in the standby state (S1), the contacts 17 and 19 are closed, and the control of the main circuit device 10 is resumed. That is, the converter circuit 11 and the inverter circuit 13 are operated. The smoothing capacitors 15 and 16 are kept charged in the standby state. For this reason, when the operation of the main circuit device 10 is resumed, the rise time (charging time) of the DC main circuit voltage can be shortened. Therefore, the time until the elevator is started can be shortened.

  According to the first embodiment, the contacts 17 and 19 are provided between the smoothing capacitors 15 and 16 for smoothing the DC main circuit voltage and the voltage balancing resistors 18 and 20, and the standby state in which the hall call continues for a certain period of time. , The contacts 17 and 19 are opened to suppress the discharge of the smoothing capacitors 15 and 16. For this reason, when a hall call occurs, the DC main circuit is immediately constructed by closing the contacts 17 and 19, and the elevator can be started at high speed from the standby state.

  Since the contacts 17 and 19 are opened during standby, the current flowing through the voltage balancing resistors 18 and 20 can be reduced. For this reason, it is possible to reduce power consumption during standby.

(Second Embodiment)
FIG. 3 shows a second embodiment. 3, the same parts as those in FIG. 1 are denoted by the same reference numerals, and only different parts will be described.

  In the second embodiment, a circuit including a capacitor provided in the DC main circuit device can be separated by a controllable contact, and the discharge power from the capacitor is reduced and the life of the capacitor is extended. In the second embodiment, the discharge circuit of the main circuit may or may not be present.

  In FIG. 3, for example, a smoothing capacitor 32 is connected between one end and the other end of the converter circuit 11 via a contact 31, and a snubber capacitor 34 is further connected via a contact 33. The smoothing capacitor 32 smoothes the output voltage of the converter circuit 11. The snubber capacitor 34 absorbs a surge voltage generated with the operation of a switching element (not shown) constituting the inverter circuit 13.

  In the above configuration, when the main circuit device 10 is in the activated state, the contacts 31 and 33 are closed. For this reason, the DC main circuit voltage generated by the converter circuit 11 is smoothed by the smoothing capacitor 32. Further, the surge voltage generated with the operation of the inverter circuit 13 is absorbed by the snubber capacitor 34.

  On the other hand, when it is determined that there is no hall call for a certain period of time, the operation of the main circuit device 10 is stopped, and the contacts 31 and 33 are opened and set in a standby state. In this standby state, the smoothing capacitor 32 and the snubber capacitor 34 are disconnected from the main circuit device 10 by opening the contacts 31 and 33. For this reason, the charge state of the smoothing capacitor 32 and the snubber capacitor 34 is maintained.

  When a hall call is detected in the standby state, the contacts 31 and 33 are closed, and the operation of the main circuit device 10 is resumed. Since the smoothing capacitor 32 is kept charged in the standby state, when the operation of the main circuit device 10 is resumed, the rise time (charging time) of the DC main circuit voltage can be shortened. Therefore, the time until the elevator is started can be shortened.

  According to the second embodiment, the contacts 31 and 33 are connected to the smoothing capacitor 32 for smoothing the DC main circuit voltage and the snubber capacitor 34. By opening, the discharge from the smoothing capacitor 32 and the snubber capacitor 34 is suppressed. When a hall call occurs, the smoothing capacitor 32 can be charged immediately by closing the contacts 31 and 33, and the DC main circuit voltage can be raised at high speed. Therefore, it is possible to start the elevator at high speed from the standby state.

  Further, by opening the contacts 31 and 33 in the standby state, the discharge through the smoothing capacitor 32 and the snubber capacitor 34 can be suppressed, so that it is possible to reduce power consumption during standby.

  Furthermore, charging / discharging of the smoothing capacitor 32 and the snubber capacitor 34 can be minimized. For this reason, it is possible to contribute to extending the life of the smoothing capacitor 32 and the snubber capacitor 34.

(Third embodiment)
FIG. 4 shows a third embodiment. In the third embodiment, the same parts as those in FIG. 1 are denoted by the same reference numerals, and only different parts will be described.

  In the third embodiment, when it is detected that there is no hall call for a certain period of time, the operation of the main circuit device 10 is stopped, or the main circuit device 10 is disconnected from the purchased AC side and stopped. 10 discharge circuits are disconnected.

  In the main circuit device 10 shown in FIG. 4, smoothing capacitors 15 and 16 are connected in series between one end and the other end of the converter circuit 11, a voltage balancing resistor 18 is connected in parallel to the smoothing capacitor 15, and a voltage is applied to the smoothing capacitor 16. A balancing resistor 20 is connected in parallel. Further, a contact 41 and a main circuit discharge resistor 42 are connected in series between one end and the other end of the converter circuit 11.

  Further, a contact 43 is inserted and connected to the wiring 12 that connects the input end of the converter circuit 11 and the purchased AC side. When the contact 43 is opened, the main circuit device 10 is disconnected from the power purchase AC side, and the main circuit device 10 is stopped. For example, a series circuit of a contact 44 and a resistor 45 is connected in parallel to the contact 43 as a main charging contact. The contact 44 is a spare charging contact, and the resistor 45 is a spare charging resistor.

  In the above configuration, for example, when the contact 43 is closed and AC power is supplied to the converter circuit 11 and the main circuit device 10 is in the activated state, the DC main circuit voltage generated by the converter circuit 11 is the smoothing capacitor 15. , 16, and the capacitor voltage is averaged by the voltage balancing resistors 18, 20.

  In the normal operation state, the contact 41 is opened, and the discharging resistor 42 is disconnected from the main circuit device 10. In the present embodiment, the discharging resistor 42 of the main circuit discharges the main circuit only when the power is shut off or in an elevator stop state such as parking. For this reason, the contact point 41 is kept open during normal operation and in a standby state.

  On the other hand, when it is determined that there is no hall call for a certain time, the contact 43 is opened, and the supply of AC power to the main circuit device 10 is stopped. In this case, if the control is normal, the contact 41 is closed, the discharging resistor 42 is connected to the main circuit, and the main circuit is discharged. However, as described above, in the present embodiment, the contact 41 remains in an open state, and discharge of the main circuit is suppressed. As a result, the DC main circuit voltage is prevented from being discharged, and the voltage value is maintained at a high level for a long time in the standby state.

  In the standby state, when a hall call is detected, the contact 43 is closed and the power supply to the main circuit device 10 is resumed. As described above, the DC main circuit voltage is maintained at a high level in the standby state. For this reason, when the operation of the main circuit device 10 is resumed, the rise time (charging time) of the DC main circuit voltage can be shortened. Therefore, the time until the elevator is started can be shortened.

  According to the third embodiment, the contact 43 is provided between the converter circuit 11 and the power purchase AC side, and the contact 43 is opened in a standby state in which the hall call continues for a certain period of time. The operation is stopped, and at this time, the contact 41 is left open and the discharging resistor 42 is disconnected from the main circuit. For this reason, it is possible to prevent the main circuit voltage from being lowered in the standby state. Therefore, when the hall call is generated and the contact 43 is closed and the operation of the main circuit device 10 is resumed, the main circuit voltage can be raised at a high speed. Therefore, it is possible to start the elevator at high speed from the standby state.

(Modification)
FIG. 5 shows a modification of the first embodiment, for example. The same parts as those in FIG.

  In this modification, the main circuit device 10 is provided with a voltage detection circuit 51 that detects a DC main circuit voltage. An output signal of the voltage detection circuit 51 is supplied to the control unit 21.

  In such a configuration, when the main circuit voltage detected by the voltage detection circuit 51 becomes equal to or lower than a predetermined reference voltage in the standby state, the control unit 21 temporarily turns on, for example, the inverter circuit 11 of the main circuit device 10. Start up and charge the main circuit voltage.

  According to this modification, the main circuit voltage is monitored by the voltage detection circuit 51, and when the main circuit voltage becomes equal to or lower than a predetermined reference voltage, the main circuit voltage is charged, so that the standby state is prolonged. Even in this case, after the hall call is generated, the elevator can be started at a high speed from the standby state.

  The above configuration is not limited to the first embodiment, and can also be applied to the second and third embodiments. In the case of the third embodiment, when the detected output voltage of the voltage detection circuit 51 becomes equal to or lower than the reference voltage, the contact 43 and the converter circuit 11 may be temporarily activated.

  In addition, although the said 1st thru | or 3rd embodiment demonstrated based on the main circuit apparatus of an elevator, it is also possible to apply not only to this but other apparatuses, such as an escalator, for example.

  In addition, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 10 ... Main circuit apparatus, 11 ... Converter circuit, 13 ... Inverter circuit, 15, 16, 32 ... Smoothing capacitor, 17, 19, 31, 33, 41, 43, 44 ... Contact, 18, 20 ... Resistance for voltage balance, DESCRIPTION OF SYMBOLS 21 ... Control part, 34 ... Snubber capacitor, 42 ... Resistance for discharge, 51 ... Voltage detection circuit.

Claims (5)

A converter circuit for converting an AC power source into a DC voltage;
An inverter circuit for converting the DC voltage converted by the converter circuit into a variable AC voltage for driving a motor of an elevator;
A smoothing capacitor for smoothing the DC voltage converted by the converter circuit;
A first contact connected to the smoothing capacitor;
And a control means for opening the first contact when the elevator is in a standby state.   The elevator control device according to claim 1, wherein the first contact is connected between the smoothing capacitor and the converter. A snubber circuit that absorbs a surge voltage generated from the inverter circuit;
The elevator control according to claim 2, further comprising: a second contact connected between the snubber circuit and the inverter circuit and opened by the control means when the elevator is in a standby state. apparatus. Further comprising voltage detection means for detecting the DC voltage;
4. The control unit according to claim 3, wherein the control unit temporarily activates the inverter circuit when the voltage detected by the voltage detection unit during standby of the elevator is equal to or lower than a predetermined threshold voltage. Elevator control device. A balance resistor for averaging the voltage of the smoothing capacitor;
The elevator control device according to claim 4, further comprising a third contact connected between the smoothing capacitor and the balance resistor and opened during the standby.

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