CN118302376A - Electrical safety device for elevator and elevator device - Google Patents

Abstract

The electric safety device (23) is provided with, for example, a single-phase bridge inverter circuit (26), a contact circuit (28), a contact circuit (29), and a single-phase diode bridge circuit (30). A single-phase bridge inverter circuit (26) converts a DC voltage from a safety chain circuit (25) into an AC voltage. When the contacts (51 a) and the plurality of contacts (53 a) are closed, the single-phase diode bridge circuit (30) converts an alternating-current voltage input from the single-phase bridge inverter circuit (30) via the contact circuit (28) and the contact circuit (29) into a direct-current voltage.

Description

Electrical safety device for elevator and elevator device

Technical Field

The present invention relates to an electrical safety device for an elevator and an elevator device.

Background

Patent document 1 describes an elevator apparatus. The elevator apparatus described in patent document 1 includes a door chain circuit in which contacts of a car door switch and a plurality of contacts of a landing door switch are connected in series. If the door link circuit is closed, the relay contacts are closed. The relay contacts are contained in a safety chain circuit.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 7-2472

Disclosure of Invention

Problems to be solved by the invention

An elevator apparatus includes an electrical safety device for stopping power supply to a hoisting machine when a specific abnormality is detected. The device including the door chain circuit and the safety chain circuit described in patent document 1 is an example of an electrical safety device.

In the elevator apparatus described in patent document 1, a relay is required to realize an electric safety device. Further, since the contacts of the car door switch and the contacts of the landing door switch are connected in series, wiring becomes complicated. Therefore, there is a problem that the cost required for the electric safety device becomes high.

The present invention has been made to solve the above-described problems. The invention aims to provide an electric safety device of an elevator, which can reduce the cost. Another object of the present invention is to provide an elevator apparatus including such an electrical safety device.

Means for solving the problems

An electrical safety device for an elevator of the present invention comprises: a single-phase bridge inverter circuit that converts a direct voltage from a safety chain circuit into an alternating voltage, wherein the safety chain circuit includes a plurality of safety device contacts connected in series; a1 st contact circuit including a1 st contact of the car door switch and connected to a1 st output of the ac side of the single-phase bridge inverter circuit; a2 nd contact circuit including a plurality of 2 nd contacts of the landing door switch, the plurality of 2 nd contacts being connected in series, the 2 nd contact circuit being connected to a2 nd output of the ac side of the single-phase bridge inverter circuit; and a single-phase rectifying circuit that converts an alternating-current voltage input from the single-phase bridge inverter circuit via the 1 st contact circuit and the 2 nd contact circuit into a direct-current voltage when the 1 st contact and the plurality of 2 nd contacts are closed.

An elevator device of the present invention includes: the above-mentioned electrical safety device; a converter circuit that converts an alternating-current voltage from an alternating-current power supply into a direct-current voltage; a smoothing capacitor connected to a DC side of the converter circuit; and an inverter circuit that converts the DC voltage smoothed by the smoothing capacitor into an AC voltage and drives a motor of the hoisting machine.

Effects of the invention

According to the invention, the cost required for the electrical safety device of the elevator can be reduced.

Drawings

Fig. 1 is a diagram showing an example of an elevator apparatus according to embodiment 1.

Fig. 2 is a diagram showing an example of the elevator apparatus according to embodiment 1.

Fig. 3 is an enlarged view showing the electric safety device.

Fig. 4 is a diagram for explaining the function of the electric safety device.

Fig. 5 is a diagram for explaining the function of the electric safety device.

Fig. 6 is a diagram for explaining the function of the electric safety device.

Fig. 7 is a view showing another example of the elevator apparatus according to embodiment 1.

Fig. 8 is a view showing another example of the elevator apparatus according to embodiment 1.

Fig. 9 is a view showing another example of the elevator apparatus according to embodiment 1.

Detailed Description

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Duplicate descriptions are appropriately simplified or omitted. In the drawings, like reference numerals designate like or corresponding parts throughout the several views.

Embodiment 1.

Fig. 1 and 2 are diagrams showing examples of the elevator apparatus according to embodiment 1. The elevator apparatus includes a converter circuit 2, a bus bar 3, a smoothing capacitor 4, an inverter circuit 5, and a control circuit 6.

The converter circuit 2 is connected to the ac power source 1 via a main breaker. The ac power supply 1 is, for example, a commercial three-phase ac power supply. The converter circuit 2 converts an alternating voltage from the alternating current power supply 1 into a direct current voltage. A bus bar 3 is connected between the converter circuit 2 and the inverter circuit 5. The dc voltage from the converter circuit 2 is supplied to the bus bar 3.

A smoothing capacitor 4 is connected between the dc side of the converter circuit 2, that is, the bus bars 3. The smoothing capacitor 4 performs smoothing processing on the dc voltage from the converter circuit 2. The inverter circuit 5 converts the dc voltage smoothed by the smoothing capacitor 4 into an ac voltage. Fig. 1 shows an example in which the inverter circuit 5 includes an IGBT (Insulated Gate Bipolar Transistor: insulated gate bipolar transistor) and a diode for reflow connected in anti-parallel to the IGBT as switching elements. The inverter circuit 5 is controlled by a control circuit 6. That is, the control circuit 6 controls the switching elements included in the inverter circuit 5.

The elevator apparatus further includes a car 7, a counterweight 8, ropes 9, and a hoisting machine 10. The hoisting machine 10 includes a drive sheave 11, a motor 12, and a brake device 13.

The car 7 moves up and down in the hoistway. The car 7 and the counterweight 8 are suspended in the hoistway by means of ropes 9. The counterweight 8 moves up and down in the hoistway in a direction opposite to the direction in which the car 7 moves. Fig. 2 shows 1 as an example: 1 roping elevator arrangement.

The rope 9 is wound around the drive sheave 11. The motor 12 generates a force for rotating the drive sheave 11. When the drive sheave 11 rotates, the car 7 moves in a direction corresponding to the rotation direction of the drive sheave 11. That is, the motor 12 is driven by the inverter circuit 5, thereby driving the sheave 11 to rotate and the car 7 to move. The brake device 13 includes a brake coil 14. The braking device 13 generates a force for preventing the rotation of the drive sheave 11. In the following, this force is also referred to as blocking force.

The elevator apparatus further includes a DC-DC converter 15, a drive circuit 16, a control circuit 17, a control circuit 18, and a power supply circuit 19. The DC-DC converter 15 includes a single-phase bridge inverter circuit 20, an insulation transformer 21, and a single-phase diode bridge circuit 22.

The drive circuit 16 is a circuit for driving the brake device 13. If no current flows to the brake coil 14, the braking device 13 generates a blocking force. If current flows to the brake coil 14, the blocking force is lost. Fig. 1 shows an example in which the driving circuit 16 includes a MOSFET (Metal-Oxide-Semiconductor FIELD EFFECT Transistor) as a switching element. The drive circuit 16 is controlled by a control circuit 18. That is, the control circuit 18 controls the switching elements included in the drive circuit 16.

The single-phase bridge inverter circuit 20 is connected to a primary winding of an insulation transformer 21. The single-phase bridge inverter circuit 20 converts the direct-current voltage from the bus bar 3 into an alternating-current voltage. The ac voltage converted by the single-phase bridge inverter circuit 20 is supplied to the primary side coil of the insulation transformer 21.

The single-phase diode bridge circuit 22 is connected to the secondary side coil of the insulation transformer 21. The single-phase diode bridge circuit 22 converts the ac voltage induced in the secondary winding of the insulation transformer 21 into a dc voltage. The dc voltage converted by the single-phase diode bridge circuit 22 is supplied to the driving circuit 16. That is, the DC-DC converter 15 supplies a direct current voltage to the driving circuit 16. The DC-DC converter 15 functions as a power supply circuit for the drive circuit 16.

Fig. 1 shows an example in which the single-phase bridge inverter circuit 20 includes an IGBT and a diode for reflow connected in anti-parallel to the IGBT as switching elements. The single-phase bridge inverter circuit 20 is controlled by the control circuit 17. That is, the control circuit 17 drives the switching elements included in the single-phase bridge inverter circuit 20, thereby controlling the DC-DC converter 15.

The power supply circuit 19 supplies a dc voltage to the control circuit 6. The control circuit 6 is supplied with a dc voltage from the power supply circuit 19, thereby controlling the inverter circuit 5. If no direct voltage is supplied from the power supply circuit 19 to the control circuit 6, the motor 12 is not driven. That is, if no dc voltage is supplied from the power supply circuit 19 to the control circuit 6, the car 7 cannot be moved by the motor 12.

Further, the power supply circuit 19 supplies a direct-current voltage to the control circuit 17. The control circuit 17 is supplied with a dc voltage from the power supply circuit 19, thereby controlling the single-phase bridge inverter circuit 20. If no direct voltage is supplied from the power supply circuit 19 to the control circuit 17, current does not flow to the brake coil 14. That is, if no direct-current voltage is supplied from the power supply circuit 19 to the control circuit 17, the braking device 13 generates a blocking force.

The elevator apparatus is also provided with an electrical safety device 23. Fig. 3 is an enlarged view showing the electric safety device 23. The electric safety device 23 includes a power supply circuit 24, a safety chain circuit 25, a single-phase bridge inverter circuit 26, a control circuit 27, a contact circuit 28, a contact circuit 29, a single-phase diode bridge circuit 30, a monitor circuit 31, and a monitor circuit 32.

The power supply circuit 24 converts an ac voltage from the ac power supply 1 into a dc voltage. A safety chain circuit 25 is connected between the power supply circuit 24 and the single-phase bridge inverter circuit 26. The dc voltage converted by the power supply circuit 24 is supplied to the safety chain circuit 25.

The safety chain circuit 25 includes a plurality of safety device contacts connected in series. The safety device is a device for detecting a specific abnormality that requires stopping power supply to the hoisting machine 10. Each safety device is provided with a safety device contact. When the safety device detects a specific abnormality, a safety device contact provided in the safety device is opened. The overspeed governor that detects overspeed of the car 7 is an example of a safety gear. For example, when the overspeed governor detects overspeed of the car 7, the safety gear contacts provided in the overspeed governor are opened.

The single-phase bridge inverter circuit 26 converts the direct-current voltage from the safety chain circuit 25 into an alternating-current voltage. For example, the single-phase bridge inverter circuit 26 converts to rectangular wave ac voltage. Fig. 1 shows an example in which the single-phase bridge inverter circuit 26 includes an IGBT and a diode for reflow connected in anti-parallel to the IGBT as switching elements. The single-phase bridge inverter circuit 26 is controlled by a control circuit 27. That is, the control circuit 27 controls switching elements included in the single-phase bridge inverter circuit 26.

The contact circuit 28 is connected to one output 26a of the single-phase bridge inverter circuit 26 on the ac side. The contact circuit 29 is connected to the other output 26b on the ac side of the single-phase bridge inverter circuit 26.

As shown in fig. 2, the car 7 includes a car door 50 and a car door switch 51. The car door 50 opens and closes an entrance formed in the car 7. The car door switch 51 is a switch for detecting that the car door 50 is located at a specific fully-closed position. If the car door 50 is in the fully closed position, the contact 51a of the car door switch 51 is closed. If the car door 50 is not in the fully closed position, the contact 51a of the car door switch 51 is opened. For example, when the car door 50 moves from the fully closed position, the contacts 51a are opened. The contact 51a of the car door switch 51 is contained in the contact circuit 28.

Landing doors 52 and landing door switches 53 are provided at each landing at which the car 7 stops. The landing door 52 opens and closes an entrance formed in the landing. The landing door switch 53 is a switch for detecting that the landing door 52 is located at a specific fully-closed position. If the landing door 52 is in the fully closed position, the contact 53a of the landing door switch 53 is closed. If the landing door 52 is not in the fully closed position, the contact 53a of the landing door switch 53 is opened. For example, when the landing door 52 of the 1 st floor is moved from the fully closed position, the contact 53a of the landing door switch 53 of the 1 st floor is opened.

The contacts 53a of the landing door switch 53 are contained in the contact circuit 29. The contacts 53a included in the contact circuit 29 are connected in series. For example, if there are landings at each of 1 to 10 floors of the building, the elevator apparatus is provided with 10 landing door switches 53. In this case, the contact circuit 29 includes 10 contacts 53a connected in series, that is, the contact 53a of the landing door switch 53 of layer 1, the contacts 53a, … of the landing door switch 53 of layer 2, and the contact 53a of the landing door switch 53 of layer 10.

A single-phase diode bridge circuit 30 is connected between the contact circuit 28 and the contact circuit 29. When the contacts 51a and all the contacts 53a are closed, an alternating voltage from the single-phase bridge inverter circuit 26 is input to the single-phase diode bridge circuit 30 via the contact circuits 28 and 29. The single-phase diode bridge circuit 30 is an example of a single-phase rectifying circuit. The single-phase diode bridge circuit 30 converts an input ac voltage into a dc voltage. The dc voltage converted by the single-phase diode bridge circuit 30 is supplied to the power supply circuit 19. Fig. 1 shows an example in which a smoothing capacitor is connected to the dc side of the single-phase diode bridge circuit 30.

The monitor circuit 31 is connected between the single-phase diode bridge circuit 30 side of the contact circuit 28 and the output 26b of the single-phase bridge inverter circuit 26. Fig. 1 shows an example in which the monitoring circuit 31 is provided with a photocoupler as an element for detecting shorting of the contacts 51a of the car door switch 51. That is, if the contact 51a is shorted, the ac voltage from the single-phase bridge inverter circuit 26 is supplied to the photocoupler of the monitor circuit 31. When the ac voltage from the single-phase bridge inverter circuit 26 is supplied to the photocoupler, a detection signal is outputted from the monitor circuit 31.

The monitor circuit 32 is connected between the single-phase diode bridge circuit 30 side of the contact circuit 29 and the output 26a of the single-phase bridge inverter circuit 26. Fig. 1 shows an example in which the monitor circuit 32 includes a photocoupler as an element for detecting shorting of all the contacts 53a included in the contact circuit 29. That is, if all of the contacts 53a are shorted, the ac voltage from the single-phase bridge inverter circuit 26 will be provided to the optocoupler of the monitoring circuit 32. When the ac voltage from the single-phase bridge inverter circuit 26 is supplied to the photocoupler, a detection signal is output from the monitor circuit 32.

Fig. 4 to 6 are diagrams for explaining the function of the electric safety device 23. Fig. 4 to 6 show examples in which the electric safety device 23 further includes a monitor circuit 33. The monitor circuit 33 is connected to the dc side of the single-phase diode bridge circuit 30. In the example shown in fig. 4 to 6, the monitoring circuit 33 includes a photocoupler. When the direct current voltage from the single-phase diode bridge circuit 30 is supplied to the photocoupler, a detection signal is outputted from the monitor circuit 33.

In the example shown in fig. 4, the car doors 50 and all of the landing doors 52 are closed. That is, fig. 4 shows an example in which the contact 51a is closed with all the contacts 53a included in the contact circuit 29.

In the example shown in fig. 4, the ac voltage from the single-phase bridge inverter circuit 26 is supplied to the single-phase diode bridge circuit 30. Accordingly, the direct-current voltage from the single-phase diode bridge circuit 30 is supplied to the power supply circuit 19. The power supply circuit 19 supplies a dc voltage to the control circuit 6 and the control circuit 17.

In the example shown in fig. 4, the direct-current voltage from the single-phase diode bridge circuit 30 is supplied to the photocoupler of the monitor circuit 33. Therefore, a detection signal is output from the monitor circuit 33.

Further, since the contact 51a is closed, the alternating-current voltage from the single-phase bridge inverter circuit 26 is supplied to the photocoupler of the monitor circuit 31. Therefore, the detection signal is output from the monitor circuit 31. Similarly, since all of the contacts 53a included in the contact circuit 29 are closed, the ac voltage from the single-phase bridge inverter circuit 26 is supplied to the photocoupler of the monitor circuit 32. Accordingly, the detection signal is output from the monitor circuit 32.

In the example shown in fig. 5 and 6, the car door 50 and the landing door 52 of a floor are opened. In the description relating to fig. 5 and 6, the contact of the landing door switch 53 for detecting that the opened landing door 52 is located at the fully closed position is referred to as "contact 53b" to distinguish from the other contact 53 a. That is, in fig. 5 and 6, the contact 53a represents a closed contact.

Fig. 5 shows an example in which the contacts 51a of the car door switch 51 are themselves open but the contacts 51a are shorted for some reason. In the example shown in fig. 5, the contact 53b is opened. Therefore, no voltage is generated on the direct current side of the single-phase diode bridge circuit 30. That is, the direct-current voltage is not supplied from the single-phase diode bridge circuit 30 to the power supply circuit 19. The detection signal is not outputted from the monitor circuit 33.

On the other hand, since the contact 51a of the car door switch 51 is shorted, a voltage is generated in the monitoring circuit 31. Therefore, the detection signal is output from the monitor circuit 31. Further, the contact 53b is opened, and therefore, no voltage is generated in the monitor circuit 32. Therefore, the detection signal is not output from the monitor circuit 32.

Fig. 6 shows an example in which the contact 53b itself is opened but the contact 53b is shorted for some reason. In the example shown in fig. 6, the contact 51a is opened. Therefore, no voltage is generated on the direct current side of the single-phase diode bridge circuit 30. That is, the direct-current voltage is not supplied from the single-phase diode bridge circuit 30 to the power supply circuit 19. The detection signal is not outputted from the monitor circuit 33.

On the other hand, the contact 53b is shorted, and thus, a voltage is generated in the monitor circuit 32. Accordingly, the detection signal is output from the monitor circuit 32. Further, the contact 51a is opened, and therefore, no voltage is generated in the monitor circuit 31. Therefore, the detection signal is not outputted from the monitor circuit 31.

In the example shown in fig. 6, if the contact 53b is not shorted, no voltage is generated on the dc side of the single-phase diode bridge circuit 30. No voltage is generated in the monitor circuit 31. No voltage is generated in the monitor circuit 32. Therefore, no detection signal is output from any of the monitoring circuits 31 to 33.

In the example shown in the present embodiment, when the contacts 51a and all the contacts 53a are closed, the single-phase diode bridge circuit 30 converts the ac voltage input from the single-phase bridge inverter circuit 26 via the contact circuits 28 and 29 into the dc voltage. Therefore, the electric safety device 23 does not need to be provided with a relay. Further, since the contact circuit 28 and the contact circuit 29 do not need to be connected in series, wiring can be simplified. In the example shown in the present embodiment, the cost required for the electric safety device 23 can be reduced.

In the example shown in the present embodiment, the opening and closing of the contact circuit 28 can be independently monitored by the monitoring circuit 31. The opening and closing of the contact circuit 29 can be independently monitored by the monitoring circuit 32. Therefore, for example, as shown in fig. 5, shorting of the car door 50 and the contact 51a when the landing door 52 of a certain floor is opened can be detected. As shown in fig. 6, the shorting of the car door 50 and the contact 53b when the landing door 52 of a floor is opened can be detected.

In the example shown in the present embodiment, the dc voltage converted by the single-phase diode bridge circuit 30 is supplied to the power supply circuit 19. Therefore, it is not necessary to provide a contactor for stopping the power supply to the hoisting machine 10.

Fig. 7 and 8 are diagrams showing another example of the elevator apparatus according to embodiment 1. In the following, only the differences from the examples shown in fig. 1 and 2 will be described in detail.

In the elevator apparatus, a resistor 34 and a switching element 35 are connected in series between the bus bars 3. Fig. 7 shows an example in which an IGBT is used as the switching element 35, as in fig. 1. During the regenerative operation of the motor 12, the switching element 35 is turned on as needed, and the electric power supplied to the bus bar 3 is consumed by the resistor 34.

The control circuit 36 controls the switching element 35. In the example shown in fig. 7, the dc voltage from the power supply circuit 24 is supplied to the control circuit 36. Fig. 7 shows an example in which the direct-current voltage from the power supply circuit 24 is also supplied to the control circuit 18 and the control circuit 27.

In the example shown in fig. 7 and 8, the power supply circuit 19 includes an upper arm power supply circuit 37 and a lower arm power supply circuit 38. The control circuit 6 includes a drive circuit 39 and a drive circuit 40. The control circuit 17 includes a drive circuit 41 and a drive circuit 42.

Fig. 8 shows an example in which the inverter circuit 5 is implemented by an IPM (INTELLIGENCE POWER MODULE: intelligent power module) for driving the motor 12. The driving circuit 39 is a gate driving circuit for driving the switching element included in the upper arm of the inverter circuit 5. The driving circuit 39 is connected to each of the following Gate Drivers (GD) among the gate drivers included in the IPM: each of the gate drivers is connected to a switching element included in an upper arm of the inverter circuit 5.

The driving circuit 40 is a gate driving circuit for driving the switching element included in the lower arm of the inverter circuit 5. The driving circuit 40 is connected to the following gate driver among the gate drivers included in the IPM: the gate driver is connected to a switching element included in a lower arm of the inverter circuit 5.

Fig. 8 shows an example in which the inverter function of the DC-DC converter 15 is realized by IPM for the power supply of the brake device 13. The drive circuit 41 is a gate drive circuit for driving switching elements included in the upper arm of the single-phase bridge inverter circuit 20. The driving circuit 41 is connected to each of the following Gate Drivers (GD) among the gate drivers included in the IPM: each of the gate drivers is connected to a switching element included in the upper arm of the single-phase bridge inverter circuit 20.

The drive circuit 42 is a gate drive circuit for driving switching elements included in the lower arm of the single-phase bridge inverter circuit 20. The driving circuit 42 is connected to the following gate driver among the gate drivers included in the IPM: the gate driver is connected to a switching element included in the lower arm of the single-phase bridge inverter circuit 20.

The upper arm power supply circuit 37 is supplied with a dc voltage converted by the single-phase diode bridge circuit 30. The upper arm power supply circuit 37 is a circuit for supplying power necessary for driving the upper arm of the inverter circuit 5 and the upper arm of the single-phase bridge inverter circuit 20. The upper arm power supply circuit 37 supplies a dc voltage to the drive circuit 39. The upper arm power supply circuit 37 supplies a dc voltage to the drive circuit 41.

The lower arm power supply circuit 38 is supplied with a dc voltage converted by the single-phase diode bridge circuit 30. The lower arm power supply circuit 38 is a circuit for supplying power necessary for driving the lower arm of the inverter circuit 5 and the lower arm of the single-phase bridge inverter circuit 20. The lower arm power supply circuit 38 supplies a dc voltage to the drive circuit 40. The lower arm power supply circuit 38 supplies a dc voltage to the drive circuit 42. The lower arm power supply circuit 38 is provided independently of the upper arm power supply circuit 37. For example, no voltage is supplied from the upper arm power supply circuit 37 to the lower arm power supply circuit 38. No voltage is supplied from the lower arm power supply circuit 38 to the upper arm power supply circuit 37.

Fig. 8 shows an example in which the upper arm power supply circuit 37 includes a switching element and a transformer. The transformer includes a secondary side coil corresponding to each of the switching elements included in the upper arm of the inverter circuit 5 and the upper arm of the single-phase bridge inverter circuit 20. In the example shown in fig. 8, the transformer of the upper arm power supply circuit 37 includes three secondary side coils corresponding to three switching elements included in the upper arm of the inverter circuit 5. The ac voltages induced in the three secondary windings are rectified and smoothed, respectively, and supplied to corresponding gate driving circuits in the driving circuit 39.

In the example shown in fig. 8, the upper arm power supply circuit 37 includes two secondary side coils corresponding to the two switching elements included in the upper arm of the single-phase bridge inverter circuit 20. The ac voltages induced in the two secondary windings are rectified and smoothed, respectively, and supplied to the corresponding gate driving circuits in the driving circuit 41.

Fig. 8 shows an example in which the lower arm power supply circuit 38 includes a switching element and a transformer. The transformer includes a secondary coil corresponding to the lower arm of the inverter circuit 5 and a secondary coil corresponding to the lower arm of the single-phase bridge inverter circuit 20. The ac voltage induced in the secondary winding corresponding to the lower arm of the inverter circuit 5 is rectified and smoothed, and supplied to the driving circuit 40. The drive circuit 40 includes three gate drive circuits corresponding to three switching elements included in the lower arm of the inverter circuit 5. The dc voltage from the lower arm power supply circuit 38 is supplied to each of the three gate driving circuits in the driving circuit 40.

Further, the ac voltage induced in the secondary side coil corresponding to the lower arm of the single-phase bridge inverter circuit 20 is rectified and smoothed, and supplied to the drive circuit 42. The drive circuit 42 includes two gate drive circuits corresponding to the two switching elements included in the lower arm of the single-phase bridge inverter circuit 20. The dc voltage from the lower arm power supply circuit 38 is supplied to each of the two gate driving circuits in the driving circuit 42.

In the example shown in fig. 7 and 8, if no voltage is supplied from one of the upper arm power supply circuit 37 and the lower arm power supply circuit 38, both the inverter circuit 5 and the single-phase bridge inverter circuit 20 are stopped. That is, the motor 12 is stopped, and the braking device 13 generates a stopping force. Therefore, the safety of the elevator apparatus can be improved.

In the example shown in fig. 7 and 8, the inverter circuit 5 and the single-phase bridge inverter circuit 20 share the upper arm power supply circuit 37 and the lower arm power supply circuit 38. Therefore, the power supply circuit 19 can be simplified.

Fig. 9 is a view showing another example of the elevator apparatus according to embodiment 1. Fig. 7 and 8 show examples in which the control circuit 18 is supplied with a direct-current voltage from the power supply circuit 24. The control circuit 18 may supply power based on the dc voltage from the single-phase diode bridge circuit 30. Fig. 9 shows an example in which the control circuit 18 is supplied with a dc voltage from the power supply circuit 19.

In the example shown in fig. 9, the transformer of the lower arm power supply circuit 38 further includes a secondary coil corresponding to the control circuit 18. The ac voltage induced in the secondary side coil is rectified and smoothed, and supplied to the control circuit 18. The control circuit 18 includes a Gate Driver (GD) and a gate driving circuit corresponding to the switching element included in the driving circuit 16. The dc voltage from the lower arm power supply circuit 38 is supplied to the gate driving circuit.

In the example shown in fig. 9, if no voltage is supplied from the lower arm power supply circuit 38, the control circuit 18 also stops. Therefore, the timing of generating the stopping force by the brake device 13 can be further advanced. This can further improve the safety of the elevator apparatus.

As another example, the transformer of the upper arm power supply circuit 37 may include a secondary coil corresponding to the control circuit 18. That is, the control circuit 18 may be supplied with a dc voltage from the upper arm power supply circuit 37.

Industrial applicability

The electric safety device of the present invention can be applied to all kinds of elevator devices.

Description of the reference numerals

1: An alternating current power supply; 2: a converter circuit; 3: a bus; 4: a smoothing capacitor; 5: an inverter circuit; 6: a control circuit; 7: a car; 8: a counterweight; 9: a rope; 10: a traction machine; 11: a drive sheave; 12: a motor; 13: a braking device; 14: a brake coil; 15: a DC-DC converter; 16: a driving circuit; 17-18: a control circuit; 19: a power supply circuit; 20: a single-phase bridge inverter circuit; 21: an insulation transformer; 22: a single-phase diode bridge circuit; 23: an electrical safety device; 24: a power supply circuit; 25: a safety chain circuit; 26: a single-phase bridge inverter circuit; 27: a control circuit; 28-29: a contact circuit; 30: a single-phase diode bridge circuit; 31 to 33: a monitoring circuit; 34: a resistor; 35: a switching element; 36: a control circuit; 37: a power supply circuit for the upper arm; 38: a lower arm power supply circuit; 39 to 42: a driving circuit; 50: a car door; 51: a car door switch; 51a: a contact; 52: landing door; 53: landing door switch; 53a: and a contact.

Claims (8)

1. An electrical safety device for an elevator, wherein the electrical safety device for an elevator comprises:

a single-phase bridge inverter circuit that converts a direct voltage from a safety chain circuit to an alternating voltage, wherein the safety chain circuit includes a plurality of safety device contacts connected in series;

a1 st contact circuit including a1 st contact of a car door switch and connected to a1 st output of an ac side of the single-phase bridge inverter circuit;

a 2 nd contact circuit including a plurality of 2 nd contacts of a landing door switch, the plurality of 2 nd contacts being connected in series, the 2 nd contact circuit being connected to a 2 nd output of an ac side of the single-phase bridge inverter circuit; and

And a single-phase rectifier circuit that converts an ac voltage input from the single-phase bridge inverter circuit via the 1 st contact circuit and the 2 nd contact circuit into a dc voltage when the 1 st contact and the plurality of 2 nd contacts are closed.

2. The electrical safety device of an elevator according to claim 1, wherein the electrical safety device of an elevator further comprises:

A1 st monitor circuit connected between the single-phase rectifying circuit side of the 1 st contact circuit and the 2 nd output; and

And a 2 nd monitor circuit connected between the single-phase rectifying circuit side of the 2 nd contact circuit and the 1 st output.

3. An elevator apparatus, wherein the elevator apparatus comprises:

the electrical safety device of claim 1 or 2;

A converter circuit that converts an alternating-current voltage from an alternating-current power supply into a direct-current voltage;

A smoothing capacitor connected to a direct current side of the converter circuit; and

And an inverter circuit for converting the DC voltage smoothed by the smoothing capacitor into an AC voltage and driving a motor of the hoisting machine.

4. The elevator apparatus according to claim 3, wherein,

The electric safety device further includes a1 st power supply circuit that converts an ac voltage from the ac power supply to a dc voltage and supplies the dc voltage to the safety chain circuit.

5. The elevator apparatus according to claim 3 or 4, wherein the elevator apparatus further comprises:

a 1 st control circuit that controls the inverter circuit;

a2 nd power supply circuit that supplies a direct-current voltage to a circuit for driving a brake device of the hoisting machine;

a2 nd control circuit that controls the 2 nd power supply circuit; and

A 3 rd power supply circuit that supplies a direct-current voltage to the 1 st control circuit and the 2 nd control circuit,

The 3 rd power supply circuit is supplied with a direct-current voltage from the single-phase rectifying circuit.

6. The elevator apparatus according to claim 5, wherein,

The 1 st control circuit includes:

A1 st drive circuit for driving a switching element included in an upper arm of the inverter circuit; and

A 2 nd drive circuit for driving a switching element included in a lower arm of the inverter circuit,

The 3 rd power supply circuit includes:

An upper arm power supply circuit that supplies a direct-current voltage to the 1 st drive circuit; and

And a lower arm power supply circuit that is provided independently of the upper arm power supply circuit and supplies a direct-current voltage to the 2 nd drive circuit.

7. The elevator apparatus according to claim 6, wherein,

The 2 nd control circuit includes:

a 3 rd driving circuit for driving a switching element included in an upper arm of the 2 nd power supply circuit; and

A 4 th driving circuit for driving a switching element included in a lower arm of the 2 nd power supply circuit,

The upper arm power supply circuit supplies a DC voltage to the 3 rd drive circuit,

The lower arm power supply circuit supplies a dc voltage to the 4 th drive circuit.

8. The elevator arrangement according to any one of claims 5 to 7, wherein,

The elevator apparatus further includes a 3 rd control circuit that controls the circuit for driving the brake apparatus,

The 3 rd power supply circuit supplies a direct-current voltage to the 3 rd control circuit.