KR20140018354A - Control device for elevator - Google Patents

Abstract

The converter 24 converts the electric power from the AC power supply 20 into direct current, the capacitor 26 smoothing the direct current, and the gate drive circuit 60 controlling the switching element 31 on and off. Is generated based on the inverter 30 and the AC power source 20 for driving the motor 11 for operating the car 9 of the elevator by converting to an arbitrary alternating current, and the DC power supply to the gate driving circuit 60. Gate power supply circuit 50 for supplying power, a storage battery 52 for supplying power to gate drive circuit 60 when AC power supply 20 is lost, and a voltage detector for detecting the output of gate drive circuit 60. 80, the determination unit 83 that determines whether the detected voltage value is less than or equal to the threshold value, and supplies the power from the storage battery 52 to the gate driving circuit 60 when the detected voltage value is less than or equal to the threshold value. It is provided with a supply switch Se.

Description

[0001] CONTROL DEVICE FOR ELEVATOR [0002]

The present invention relates to a control device of an elevator.

The main circuit of the elevator has a converter which uses an AC power source as a direct current, has a condenser which makes the pulsation voltage of the converter output a smooth direct current voltage, and converts the direct current voltage into an arbitrary alternating voltage using a power semiconductor element. An inverter is provided. Here, a power semiconductor element, which is generally a voltage-driven semiconductor such as an IGBT, requires a gate power source for changing the gate voltage to a positive or negative value in order to drive this.

The malfunction of the power semiconductor element is prevented by making the gate voltage negative except during the operation of the elevator. However, when the elevator main power is turned off, the output of the gate power is also lost. For this reason, negative bias cannot be made to the gate. Therefore, if the voltage of the main circuit capacitor is not discharged before this, a bus short may be caused by the semiconductor element due to malfunction of the gate.

Conventional elevator control apparatus, as shown in Patent Literature 1 below, an inverter for controlling an elevator drive motor by converting a direct current voltage smoothed by a condenser into an arbitrary alternating voltage, and a regenerative generated during regenerative operation of the motor. An elevator control device comprising a regenerative power consumption resistor that consumes electric power through a regenerative current conducting element, and a charging circuit for precharging the capacitor, which outputs an output when the voltage of the capacitor is greater than the output voltage of the charging circuit. It is known to include a voltage comparison circuit and a charge accumulation capacitor for supplying the accumulated charge as a power supply to the voltage comparison circuit when the power is cut off, and conducting the regenerative current conducting element by the output of the voltage comparison circuit.

According to the elevator control apparatus as described above, the forced discharge of the capacitor at the time of power supply is forced to be discharged by the regenerative power processing circuit, so the forced discharge of the capacitor is simplified.

[Patent Document 1] Japanese Patent Laid-Open No. 6-9164

However, in the elevator control apparatus, even if the main power is lost, before the output of the control power for controlling the semiconductor elements constituting the inverter or the like is lost, the charge accumulated in the capacitor for smoothing the output voltage of the converter is ensured. There is a problem that it is not done.

This invention is made | formed in order to solve the said subject, It aims at obtaining the elevator control apparatus which can control a semiconductor element suitably by supplying power to the control means which controls a semiconductor element when a main power supply is lost.

An elevator control apparatus according to the present invention includes a converter for converting electric power from an alternating current power source into a direct current by a semiconductor element, a capacitor for smoothing the direct current, and the direct current to an arbitrary alternating current by a switching element; In addition, an inverter for driving a motor for operating a car, control means for controlling the switching element on and off, control power supply means generated based on the AC power and supplying DC power to the control means; And a storage battery for supplying power to the control power supply means when the AC power is lost, first voltage detection means for detecting a first voltage value to be output from the control power supply means, and the first voltage value is set to 1st. First judging means for judging whether the first threshold value is less than or equal to the control means, and when the first voltage value is less than or equal to the first threshold value, It is provided with supply means for supplying electric power from a storage battery.

According to the elevator control apparatus of the present invention, the first judging means judges whether or not the first voltage value of the control power supply means is equal to or less than the first threshold value, and when the supply means is less than or equal to the first threshold value, the control means is sent from the storage battery. To supply power. Therefore, even when the output voltage of the control power supply means decreases at the time of power failure, the power supply can be continued from the storage battery to the control means, so that the switching element can be appropriately controlled by the control means.

The control apparatus of the elevator which concerns on this invention is the discharge means which discharges the charge of a capacitor | condenser based on the loss of AC power supply, the 2nd voltage detection means which detects the 2nd voltage value of a capacitor, And a second judging means for judging whether or not it is higher than a second threshold, and the supplying means preferably supplies power from the storage battery to the control means if the second voltage value is higher than the second threshold.

According to the control device of the elevator, the supply means additionally supplies electric power from the storage battery to the control means only when the second voltage value of the capacitor is larger than the second threshold value. Therefore, the supply means makes it possible to supply electric power from the storage battery to the control means only when the current which can flow in the event of power supply shortage by the switching element constituting the inverter can reduce the storage capacity and the like.

The control power supply means in the elevator control apparatus according to the present invention has at least first and second control power supply means, and the respective outputs are connected in parallel, and the first control power supply means is a direct current voltage to the control means. Is supplied, and it is preferable that the supply means supplies the DC voltage to the control means through the second control power supply means when the first voltage value becomes less than or equal to the first threshold value.

According to the control device of the elevator, even if the first control power supply means fails, power can be supplied from the second control power supply to the control means, thereby improving reliability of the failure of the control power supply means.

It is preferable to make the output voltage of the 2nd control power supply means in the control apparatus of the elevator which concerns on this invention lower than the output voltage of the 1st control power supply means.

According to the control device of the elevator, the first control power supply means only supplies power to the control means from the first control power supply means in the normal operating state, and does not supply power to the control means from the second control power supply means. And when the output voltage of a 2nd control power supply becomes higher than the output voltage of a 1st control power supply means, since power is supplied from a 2nd control power supply means to a control means, the power supply capacity of a 2nd control power supply means can be made small.

The first control power supply means in the elevator control apparatus according to the present invention generates a first positive bias voltage for turning on the switching element and a first negative bias voltage for turning off the switching element. Preferably, the second control power supply means generates only the second negative bias voltage for turning off the switching element.

According to the control device of the elevator, since the negative bias voltage is generated by the first and second control power supply means, the switching element is turned off by the negative bias voltage generated from the second control power supply means even if the first control power supply means fails. In addition to this, the second control power supply means can be simplified.

The switching element in the elevator control apparatus which concerns on this invention is provided with the upper arm and the lower arm, and it is preferable to turn off the said switching element of the said lower arm by a 2nd negative bias voltage.

According to the control device of the elevator, since the generation of the negative bias voltage of the switching element that forms the lower arm of the inverter is a duplex system, even if the first control power supply means fails, the off of the inverter as a whole is ensured. In addition to this, the second control power supply means can be made simpler.

The second control power supply means in the elevator control apparatus according to the present invention generates one second secondary bias voltage and is always connected to the output of the first control power supply means for supplying the switching elements of the plurality of lower arms. If it is determined that the first judging means is equal to or less than the first threshold, it is preferable to include an applying means for applying the second sub bias voltage to the switching element of the other lower arm.

As a result, since the dual system is obtained, even if the first control power supply means fails, the off-arm switching element can be turned off to ensure the entire inverter, and the second control power supply means has only one negative bias voltage. Since it is necessary to generate, it can be further simplified.

According to the elevator control apparatus of the present invention, when the main power is lost, power can be supplied to the control means for controlling the switching elements such as the inverter, so that the switching elements can be appropriately controlled by the control means.

1 is an overall view of an elevator according to one embodiment of the present invention.
FIG. 2 is an internal configuration diagram of the gate power supply shown in FIG. 1.
3 is a general view of an elevator according to another embodiment of the present invention.
4 is an overall view of an elevator according to another embodiment of the present invention.
FIG. 5 is an internal connection diagram of the first and second gate power supply circuits shown in FIG. 4.
6 is an internal connection diagram of another first and second gate power supply circuit.
7 is an internal connection diagram of other first and second gate power supply circuits.
8 is an internal connection diagram of other first and second gate power circuits.

Embodiment 1

One embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 is an overall view of an elevator according to an embodiment of the present invention, and FIG. 2 is an internal configuration diagram of the gate power supply circuit shown in FIG. 1.

In FIG. 1, the elevator has one end of the counterweight 3 connected to one end of the rope 5, the other end of the rope 5 connected to the car 9, and the rope 5 of the hoisting machine. The cage | basket | car 9 is made to move up and down by the motor 11 which rotates the sheave 7 of the hoisting machine in contact with the groove | channel of the sheave 7.

The control device of the elevator includes a converter 24 for converting the three-phase alternating current power supply 22 into a direct current having pulsation through the upper main power switch S1 and the upper contact point 22 of the electromagnetic switch, A capacitor 26 for smoothing the pulsating powder to a direct current, and a semiconductor element 28a for converting the direct current into an arbitrary alternating voltage, and an inverter 28 for driving the motor 11, The switching element 31 made of the semiconductor of 28 is controlled on and off by the gate driving circuit 60. The charging and discharging circuit 35 which charges and discharges the capacitor | condenser 26 via the main power switch S1 is connected to the both ends of the capacitor | condenser 26. As shown in FIG.

Similarly, the main power switch S1 has a gate power source 50 serving as a direct current power source of the gate driving circuit 60, and the storage battery 52 for a backup is provided through the supply switch Se in the gate power source circuit 50. Connected.

And it has the elevator control apparatus 70 which produces | generates the control command signal which controls the gate drive circuit 60 and the charge / discharge circuit 35. As shown in FIG.

In addition, a first voltage detector 61 that detects a first voltage value, which is an output voltage of the gate power supply circuit 50, and whether the detected first voltage value is less than or equal to the first threshold value, determines a first threshold value. When it becomes below the value, it has the 1st determination part 83 which supplies the electric power from the storage battery 52 to the gate drive circuit 60 by closing supply switch Se from the opening.

2, in the gate power supply circuit, a diode 54 connected to one end of the supply switch Se is connected to one end of an input of the DC / DC converter 58, and the main power switch S1 is an AC / DC converter. It is connected to the input of 52. One end of the input of the DC / DC converter 58 and the other end of the input of the DC / DC converter 58 are connected to the output of the AC / DC converter 52 through the diode 56. The gate power supply 50 supplies power to the DC / DC converter 58 from a power source having the higher voltage among the AC / DC converter 52 and the storage battery 52 in a state where the supply switch Se is closed. It is formed to be.

The operation of the elevator control apparatus configured as described above will be described with reference to FIGS. 1 and 2.

<Normally>

When the main power switch S1 is turned on and the top contact 22 is closed from open, an AC voltage is input to the gate power supply 50 to supply a DC voltage to the gate driving circuit 60. On the other hand, a three-phase alternating current power source is obtained by the converter 24 and input to the inverter 30. The gate drive circuit 60 controls the inverter 30 by the command signal from the elevator control device 70 to stop or drive the motor 11.

<At the time of power outage>

The main power switch S1 and the top contact 22 are opened in the closed state by the power failure, and the electric charge of the capacitor 26 is discharged to the charge / discharge circuit 35. On the other hand, the output voltage of the gate power supply circuit 50 falls. The first voltage detection unit 80 detects the first voltage value as the output voltage and inputs it to the first determination unit 83. The determination unit 83 determines whether the first voltage value is equal to or less than the first threshold value, and when the first threshold value is less than or equal to the first threshold value, the supply switch Se is closed from open to the storage battery 52 in the gate driving circuit 60. Supply power from Therefore, even when a power failure occurs, since the gate driving circuit 60 can be normally controlled, the switching element 31 of the inverter 30 can also be controlled.

The control apparatus of the elevator which concerns on the said embodiment is the converter 24 which converts the electric power from the three-phase alternating current power supply 20 into direct current by a semiconductor element, the condenser 26 which smoothes the said direct current, and direct current | flow. As the control means for controlling the switching element 31 and the inverter 30 which drives the motor 11 which operates the car 9 of an elevator, while converting into arbitrary alternating current by the semiconductor element 28a. When generated based on the gate drive circuit 60 and the AC power supply 22 and the gate power supply circuit 50 as a control power supply means for supplying DC power to the gate drive circuit 60 and the AC power supply are lost. The storage battery 52 for supplying power to the gate power supply circuit 50, the first voltage detection unit 80 for detecting the first voltage value output from the gate power supply circuit 50, and the first voltage value are the first voltage values. To determine whether it is below the threshold The first determination unit 83 and the supply switch Se as a supply means for supplying electric power from the storage battery 52 to the gate driving circuit 60 when the first voltage value is less than or equal to the first threshold value. .

According to the elevator control apparatus, the first determination unit 83 determines whether the first voltage value of the gate power supply circuit 50 is equal to or less than the first threshold value, and when the first threshold value is less than or equal to the first threshold value, the supply switch Se The power from the storage battery 52 is supplied to the gate drive circuit 60 by making it close from open. Therefore, even when the output voltage of the gate power supply circuit 50 decreases at the time of power failure, the power supply can be continued from the storage battery 52 to the gate driving circuit 60, and thus the switching element 31 is provided by the gate driving circuit 60. ) Can be controlled appropriately.

Embodiment 2 Fig.

Another embodiment of the present invention will be described with reference to FIG. 3. 3 is a general view of an elevator according to another embodiment of the present invention. In FIG. 3, the same code | symbol as FIG. 1 represents the same part, and abbreviate | omits description.

In FIG. 3, the second voltage detector 180 detects a second voltage value of the capacitor 26, and the second determination unit 183 has a first voltage value equal to or less than a first threshold value and a second voltage value. If the value is higher than the second threshold value, the supply switch Se is closed to open to supply power from the storage battery 52 to the gate drive circuit 60.

The elevator control device configured as described above normally operates in the same manner as in the first embodiment.

<At the time of power outage>

When the main power switch S1 and the top contact 22 are opened in the closed state by the power failure, the charge of the capacitor 26 is discharged by the charge / discharge circuit 35. On the other hand, the output voltage of the gate power supply circuit 50 falls. The second voltage detector 180 detects the voltages at both ends of the first voltage detector 80 and the capacitor 26 as the first voltage value as the output voltage, and inputs them to the second determination unit 183. The second determination unit 183 determines whether the first voltage value is less than or equal to the first threshold value, and determines whether the second voltage value is higher than the second threshold value so that the first voltage value is the first threshold value. When the value is less than the value and the second voltage value is higher than the second threshold value, the switch S2 is closed from the open state to supply power from the storage battery 52 to the gate driving circuit 60. As a result, the gate driving circuit 60 can be normally controlled even when a power failure occurs, and when the voltage at both ends of the capacitor 26 is higher than the second threshold, that is, the gate driving is considered in consideration of the magnitude of the short circuit current. Power from the storage battery 52 is supplied to the circuit 60.

The control apparatus of the elevator by the said embodiment detects the charging / discharging circuit 35 which discharges the electric charge of the capacitor | condenser 26, and the 2nd voltage value of the capacitor | condenser 26 based on the loss of the three-phase alternating current power supply 20. FIG. A second voltage detector 180 and a second determiner 183 that determines whether the second voltage value is higher than the second threshold value, and the supply switch Se has a first threshold value. If the value is less than the value and the second voltage value is higher than the second threshold value, it is preferable to supply electric power from the storage battery 52 to the gate driving circuit 60.

That is, since the power from the storage battery 52 is supplied to the gate driving circuit 60 only when the voltage value of the capacitor 26 is higher than the second threshold value, the capacity of the storage battery 52 can be reduced.

Embodiment 3:

Another embodiment of the present invention will be described with reference to FIGS. 4 and 5. 4 is an overall view of an elevator according to another embodiment of the present invention, and FIG. 5 is an internal connection diagram of the first and second gate power supply circuits shown in FIG. In FIG. 4, the same code | symbol as FIG. 1 shows the same part.

In Embodiments 1 and 2, there was only one gate power supply circuit 50, but in the present embodiment, as shown in FIG. 4, the gate power supply circuit 150 and the second gate power supply circuit 250 are provided. The gate power supply circuits 150 and 250 are dual systems. The inverter 30 has the upper arm 32 and the lower arm 34 which consist of the switching element 31, and the upper arm 32 has the switching element 31uu, 32uｖ, 31uw, and the lower arm 34 Has switching elements 31du, 31d ', and 31dw.

The voltage monitoring unit 200 detects output voltage values of the first and second gate power supply circuits 150 and 250, and when the two output voltage values fall below a predetermined threshold, the gate driving circuit 60. It is configured to generate a blocking signal for blocking).

In FIG. 5, the first and second gate power supply circuits 150 and 250 are flyback and have six power outputs for driving the six switching elements 31 of the inverter 30. . The first gate power supply circuit 150 applies a voltage to the capacitor 154 from the three-phase AC power supply through the three-phase electric wave bridge 152. The primary winding of the transformer 158 and the switching semiconductor element 156 are connected to both ends of the capacitor 154. Each of the first power outputs generates a positive bias voltage for turning on the switching elements 31 of the upper arm 32 and the lower arm 34, and generates a negative bias voltage for turning off the switching element 31. It has 12 windings, paired with 2 windings to produce.

One end of the diode D11 (D12 to D16) is connected to one end of the secondary winding of the transformer 158, and the other end of the diode D21 (D22 to D26) is connected to the first power output unit. One end of each of two smoothing capacitors C11 (C12 to C16) and C21 (C22 to C26) is connected to the center point. The other end of the diodes D11 (D12 to D16) is connected to the other end of the smoothing capacitor C11 (C12 to C16), and the diodes D21 (D22 to D26) are connected to the other end of the C21 (C22 to C26).

The second gate power supply circuit 250 applies a voltage from the battery 52 to the capacitor 254. The primary winding of the transformer 158 and the switching semiconductor element 256 are connected to both ends of the capacitor 254. Each power output unit generates a positive bias voltage for turning on the switching element 31 constituting the inverter 30 and a pair of two windings to generate a negative bias voltage for turning off the switching element 31. By having 12 windings.

One end of the diodes D31 (D32 to D36) is connected to one end of the secondary winding of the transformer 258, and one end of the diodes D41 (D42 to D46) is connected to the other end thereof. One end of each of the two smoothing capacitors C31 (C32 to C36) and C41 (C42 to C46) is connected from the center point of the secondary winding. The other end of the diodes D31 (D32 to D36) is connected to the other end of the smoothing capacitors C31 (C32 to C36), and the diodes D41 (D42 to D46) are connected to the other end of the capacitors C41 (C42 to C46).

In addition, the output of the second power output unit is always connected in parallel to the first power output unit.

The positive bias voltage of the first gate power supply circuit 150 is V1-1, the negative bias voltage is V2-1, and the positive bias voltage of the second gate power supply circuit 250 is V1-2, the negative bias voltage. When the voltage is set to V2-2, the absolute value of each output voltage is made to have the following relationship.

｜ V1-1 ｜ ＞ ｜ V1-2 ｜, ｜ V2-1 ｜ ＞ ｜ V2-2 ｜

By having such a relationship, in the normal state in which the first gate power supply circuit 150 is not broken, the output current of the second gate power supply circuit 250 does not flow.

The operation of the elevator control device configured as described above will be described with reference to FIGS. 4 and 5.

<Normal time>

When the main power switch S1 is turned on and the top contact 22 is closed from open, an AC voltage is input to the first gate power supply circuit 150 to supply a DC voltage to the gate driving circuit 60. . On the other hand, a three-phase alternating current power source is obtained by the converter 24 and input to the inverter 30. The first gate drive circuit 150 controls the inverter 30 by the command signal from the control device 70 to stop or drive the motor 11.

<When abnormal>

Now, when the voltage of the first gate power supply circuit 150 is lower than the output voltage of the second gate power supply circuit 250 for some reason, the inverter 30 is turned off by the output of the second gate power supply circuit 250. The gate signal is input to the switching element 31 which comprises. Therefore, even if the first gate power supply circuit 150 fails, the inverter 30 can be driven from the second gate power supply circuit 250 through the gate driving circuit 60.

In addition, since the storage battery 52 is an input source when a power failure occurs, the inverter 30 can be driven from the second gate power supply circuit 250 through the gate driving circuit 60.

Embodiment 4.

In Embodiment 3, although the 1st gate power supply circuit 150 and the 2nd gate power supply circuit 250 generate | occur | produced the positive bias voltage and the negative bias voltage in order to make the gate power circuit into dual systems as shown in FIG. In the embodiment, as shown in FIG. 6, the second gate power supply circuit 1250 is configured to generate only a negative bias voltage without generating a positive bias voltage. The negative bias voltages are always connected in parallel to the respective negative bias voltages of the corresponding first power output units.

According to the elevator control device having such a configuration, a dual system of negative bias voltage is secured. As a result, even if the negative bias voltage of the first gate power supply circuit 150 cannot be generated, the negative bias voltage can be applied from the second gate power supply circuit 1250 to the switching element 31 of the inverter 30. The switching element 31 can be reliably turned off.

As a result, in the present embodiment, since the second gate power supply circuit 1250 can omit generation of the positive bias voltage, the second gate power supply circuit 1250 can be simplified.

Embodiment 5:

In Embodiment 4, only the negative bias voltage side of the gate power supply circuit is a dual system as shown in FIG. 6. In the present embodiment, as shown in FIG. 7, the second gate power supply circuit 2250 is the lower arm 34 of the inverter. It is formed so as to generate only three negative bias voltages of the switching element 31 which is applied to (). Three negative bias voltages to be output of the second power output unit are always connected in parallel to the respective negative bias voltages of the corresponding first power output unit.

According to the control apparatus of the elevator by such a structure, since the dual system of the negative bias voltage with respect to the switching element 31 which hangs on the lower arm 34 of the inverter 30 is ensured, it respond | corresponds to the 1st gate power supply circuit 150. FIG. Even if the generation portion of the negative bias voltage to be failed, the corresponding negative bias voltage can be applied from the second gate power supply circuit 2250 to the switching element 31 of the lower arm 34, thereby preventing malfunction of the switching element 31. You can prevent it.

Thereby, compared with Embodiment 4, this embodiment can abbreviate | omit generation | occurrence | production of three negative bias voltages of the switching element 31 which apply | hangs to the upper arm 32 of the inverter 30, and therefore, the 2nd gate power supply The configuration of the circuit 2250 can be simplified.

Embodiment 6:

In Embodiment 5, as shown in FIG. 7, the second gate power supply circuit 2250 generates only three negative bias voltages of the switching element 31 across the lower arm 34 of the inverter 30. Although three negative bias voltages to be output of the power output unit are always connected in parallel to the respective negative bias voltages of the corresponding first power output unit, in this embodiment, as shown in FIG. 8, the second gate power supply circuit ( 3250 is configured to generate only one negative bias voltage corresponding to the switching element 31 of the lower arm 34 of the inverter 30, and the negative bias voltage corresponds to that of the first gate power supply circuit 150. It is always connected to the output of the negative bias voltage.

The outputs of the other negative bias voltages input to the two switching elements 31 of the lower arm 34 constituting the inverter 30 are connected via switches S1 to S4.

According to the elevator control device having such a configuration, when the generator of the corresponding negative bias voltage of the first gate power supply circuit 150 detects a failure, the switches S1 to S4 are turned on and the second gate power supply circuit 3250 is turned on. Since the corresponding negative bias voltage can be applied to the switching element 31 of the lower arm 34, the malfunction of the switching element 31 can be prevented.

Thereby, compared with Embodiment 5, this embodiment can abbreviate | omit generation | occurrence | production of the two negative bias voltages of the switching element 31 which apply | hangs to the lower arm 34 of the inverter 30, Therefore, 2nd gate power supply The configuration of the circuit can be simplified.

Moreover, although the switching element 31 which comprises the inverter 30 shown in the said Embodiments 1-6 may be silicon, it is preferable to form it with the wide band gap semiconductor which has a larger band gap compared with silicon. Examples of wide band gap semiconductors include silicon carbide, gallium nitride-based materials or diamond.

Since the switching element 31 formed of such a wide band gap semiconductor has high withstand voltage and high allowable current density, the switching element 31 can be miniaturized, and by using such a miniaturized switching element 31, The inverter with built-in element can be miniaturized.

Furthermore, even if the switching element 31 which forms the inverter 30 is formed of the wide band gap semiconductor in the said Embodiment 1-6, even if an AC power supply is lost, the switching element 31 can be controlled suitably.

The present invention can be applied to a control device of an elevator.

9 car 11 motor,
20 three phase ac power supply 24 converter,
26 inverter, 28 inverter,
28a semiconductor device 50 gate power supply,
52 battery 60 gate drive circuit,
61 first voltage detector 81 first determiner;
162 a second voltage detector 182 a second determiner,
Se rescue switch

Claims (8)

A converter for converting electric power from an AC power source into a direct current by a semiconductor element,
A capacitor for smoothing the direct current,
An inverter for converting the direct current into an arbitrary alternating current by a switching element and driving a motor for operating a car;
Control means for controlling the switching element on and off;
A control power source that is generated based on the AC power and supplies DC power to the control unit;
A storage battery for supplying power to the control power supply means when the AC power is lost;
First voltage detecting means for detecting a first voltage value to be an output of the control power supply means;
First determination means for determining whether the first voltage value is less than or equal to a first threshold value;
Supply means for supplying electric power from the storage battery to the control means when the first voltage value is equal to or less than a first threshold value
Elevator control device comprising a. The method according to claim 1,
Discharge means for discharging the charge of the capacitor based on the loss of the AC power source;
Second voltage detecting means for detecting a second voltage value of the capacitor;
A second judging means for judging whether the second voltage value is higher than a second threshold value,
The supply means further supplies power to the control means from the storage battery when the second voltage value is higher than the second threshold value.
Elevator control device, characterized in that. The method according to claim 1 or 2,
The control power supply means has at least first and second control power supply means, and each output is connected in parallel, and the first control power supply means supplies a DC voltage to the control means,
The supply means supplies the DC power to the control means through the second control power supply means when the first voltage value becomes less than or equal to the first threshold value.
Elevator control device, characterized in that. The method according to claim 1 or 2,
The output voltage of the second control power supply means is lower than the output voltage of the first control power supply means.
Elevator control device, characterized in that. The method of claim 4,
The first control power supply means generates a first positive bias voltage for turning on the switching element and a first negative bias voltage for turning off the switching element,
The second control power supply means generates only a second negative bias voltage for turning off the switching element.
Elevator control device, characterized in that. The method according to claim 5,
The switching element has an upper arm and a lower arm,
Turning off the switching element of the lower arm by the second negative bias voltage;
Elevator control device, characterized in that. The method according to claim 5,
The second control power supply means generates only one second secondary bias voltage and is always connected to the outputs of the first control power supply means for supplying the switching elements of the plurality of lower arms,
If it is determined that the first determining means is equal to or less than the first threshold, applying means for applying the second negative bias voltage to the switching element of the other lower arm;
Elevator control device, characterized in that provided. The method according to any one of claims 1 to 7,
The switching element is formed of a wide band gap semiconductor
Elevator control device, characterized in that.

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