Elevator electrical safety device and elevator device

Abstract

This electric safety device (23) comprises, e.g., a single-phase bridge inverter circuit (26), a contact circuit (28), a contact circuit (29), and a single-phase diode bridge circuit (30). The single-phase bridge inverter circuit (26) converts a DC voltage from a safety chain circuit (25) to an AC voltage. When a contact (51a) and a plurality of contacts (53a) are closed, the single-phase diode bridge circuit (30) converts the AC voltage inputted from the single-phase bridge inverter circuit (30) via the contact circuit (28) and the contact circuit (29) to a DC voltage.

Description

Technical Field

[0001] The present disclosure relates to an elevator electrical safety device and an elevator device.

Background Art

[0002] Patent Document 1 describes an elevator device. The elevator device 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 chain circuit is closed, the contacts of the relay relay are closed. The contacts of the relay relay are included in the safety chain circuit.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An elevator device is provided with an electrical safety device for stopping power supply to the hoist when a specific abnormality is detected. A device including the door chain circuit and the safety chain circuit described in Patent Document 1 is an example of an electrical safety device.

[0005] In the elevator device described in Patent Document 1, a relay relay is required to realize the electrical safety device. In addition, since the contacts of the car door switch and the contacts of the landing door switch are connected in series, the wiring becomes complicated. For this reason, there has been a problem that the cost required for the electrical safety device becomes high.

[0006] The present disclosure has been made to solve the above-described problems. An object of the present disclosure is to provide an elevator electrical safety device capable of reducing costs. Another object of the present disclosure is to provide an elevator device provided with such an electrical safety device.

Means for Solving the Problem

[0007] The elevator electrical safety device according to the present disclosure includes a single-phase bridge inverter circuit that converts a DC voltage from a safety chain circuit including a plurality of safety device contacts connected in series into an AC voltage, a first contact circuit including a first contact of a car door switch and connected to a first output on the AC side of the single-phase bridge inverter circuit, a second contact circuit including a plurality of second contacts of a landing door switch, the plurality of second contacts being connected in series and connected to a second output on the AC side of the single-phase bridge inverter circuit, and a single-phase rectifier circuit that converts the AC voltage input from the single-phase bridge inverter circuit through the first contact circuit and the second contact circuit into a DC voltage when the first contact and the plurality of second contacts are closed.

[0008] The elevator device according to the present disclosure includes the above electrical safety device, a converter circuit that converts an AC voltage from an AC power supply into a DC voltage, a smoothing capacitor connected to the 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 a hoist.

Advantages of the Invention

[0009] According to the present disclosure, the cost required for the elevator electrical safety device can be reduced.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying out the Invention

[0011] Hereinafter, a detailed description will be given with reference to the drawings. Redundant descriptions will be simplified or omitted as appropriate. In each figure, the same reference numerals indicate the same or corresponding parts.

[0012] Embodiment 1. FIG. 1 and FIG. 2 are diagrams showing an example of the elevator device in Embodiment 1. The elevator device includes a converter circuit 2, a bus 3, a smoothing capacitor 4, an inverter circuit 5, and a control circuit 6.

[0013] The converter circuit 2 is connected to the AC power supply 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 the AC voltage from the AC power supply 1 into a DC voltage. A bus 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 3.

[0014] A smoothing capacitor 4 is connected to the DC side of the converter circuit 2, i.e., between the bus bars 3. The smoothing capacitor 4 smoothes 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, as switching elements, an IGBT (Insulated Gate Bipolar Transistor) and a freewheeling diode connected in anti-parallel to the IGBT. 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.

[0015] The elevator system further includes a car 7, a counterweight 8, a rope 9, and a hoisting machine 10. The hoisting machine 10 includes a traction sheave 11, a motor 12, and a brake device 13.

[0016] A car 7 moves up and down in a hoistway. The car 7 and a counterweight 8 are suspended in the hoistway by a rope 9. The counterweight 8 moves up and down in the hoistway in the opposite direction to the direction in which the car 7 moves. Figure 2 shows an example of an elevator device using a 1:1 roping system.

[0017] The rope 9 is wound around the traction sheave 11. The motor 12 generates a force to rotate the traction sheave 11. When the traction sheave 11 rotates, the car 7 moves in a direction corresponding to the rotation direction of the traction sheave 11. That is, when the motor 12 is driven by the inverter circuit 5, the traction sheave 11 rotates and the car 7 moves. The brake device 13 includes a brake coil 14. The brake device 13 generates a force to prevent the traction sheave 11 from rotating. Hereinafter, this force will also be referred to as a blocking force.

[0018] The elevator device 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 isolation transformer 21, and a single-phase diode bridge circuit 22.

[0019] The drive circuit 16 is a circuit for driving the braking device 13. If no current flows through the brake coil 14, the braking device 13 generates a braking force. When a current flows through the brake coil 14, the braking force disappears. FIG. 1 shows an example in which the drive 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 element included in the drive circuit 16.

[0020] The single-phase bridge inverter circuit 20 is connected to the primary coil of the isolation transformer 21. The single-phase bridge inverter circuit 20 converts the DC voltage from the bus 3 into an AC voltage. The AC voltage converted by the single-phase bridge inverter circuit 20 is supplied to the primary coil of the isolation transformer 21.

[0021] The single-phase diode bridge circuit 22 is connected to the secondary coil of the isolation transformer 21. The single-phase diode bridge circuit 22 converts the AC voltage induced in the secondary coil of the isolation transformer 21 into a DC voltage. The DC voltage converted by the single-phase diode bridge circuit 22 is supplied to the drive circuit 16. That is, the DC-DC converter 15 supplies a DC voltage to the drive circuit 16. The DC-DC converter 15 functions as a power supply circuit for the drive circuit 16.

[0022] FIG. 1 shows an example in which the single-phase bridge inverter circuit 20 includes an IGBT and a freewheeling diode connected in anti-parallel to the IGBT as switching elements. The single-phase bridge inverter circuit 20 is controlled by a control circuit 17. That is, the control circuit 17 controls the DC-DC converter 15 by driving the switching element included in the single-phase bridge inverter circuit 20.

[0023] The power supply circuit 19 supplies a DC voltage to the control circuit 6. When the control circuit 6 is supplied with the DC voltage from the power supply circuit 19, it controls the inverter circuit 5. If the DC voltage is not supplied from the power supply circuit 19 to the control circuit 6, the motor 12 does not operate. That is, if the DC voltage is not supplied from the power supply circuit 19 to the control circuit 6, the cage 7 cannot be moved by the motor 12.

[0024] Also, the power supply circuit 19 supplies a DC voltage to the control circuit 17. When the control circuit 17 is supplied with the DC voltage from the power supply circuit 19, it controls the single-phase bridge inverter circuit 20. If the DC voltage is not supplied from the power supply circuit 19 to the control circuit 17, no current flows through the brake coil 14. That is, if the DC voltage is not supplied from the power supply circuit 19 to the control circuit 17, the braking device 13 generates a braking force.

[0025] The elevator device further includes an electrical safety device 23. FIG. 3 is a diagram showing an enlarged view of the electrical safety device 23. The electrical 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 monitoring circuit 31, and a monitoring circuit 32.

[0026] The power supply circuit 24 converts the 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.

[0027] 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 the power supply to the hoist 10. Each safety device is provided with a safety device contact. When the safety device detects a specific abnormality, the safety device contact provided in the safety device opens. The speed governor for detecting the overspeed of the cage 7 is an example of the safety device. For example, when the speed governor detects the overspeed of the cage 7, the safety device contact provided in the speed governor opens.

[0028] The single-phase bridge inverter circuit 26 converts the DC voltage from the safety chain circuit 25 into an AC voltage. For example, the single-phase bridge inverter circuit 26 converts into a square-wave AC voltage. FIG. 1 shows an example in which the single-phase bridge inverter circuit 26 includes an IGBT and a freewheeling diode connected in antiparallel 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 the switching elements included in the single-phase bridge inverter circuit 26.

[0029] The contact circuit 28 is connected to one output 26a on the AC side of the single-phase bridge inverter circuit 26. The contact circuit 29 is connected to the other output 26b on the AC side of the single-phase bridge inverter circuit 26.

[0030] As shown in FIG. 2 , the car 7 is equipped with 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 whether the car door 50 is in a specific fully closed position. When the car door 50 is in the fully closed position, the contact 51 a of the car door switch 51 is closed. When the car door 50 is not in the fully closed position, the contact 51 a of the car door switch 51 is open. For example, when the car door 50 moves from the fully closed position, the contact 51 a is open. The contact 51 a of the car door switch 51 is included in the contact circuit 28.

[0031] A landing door 52 and a landing door switch 53 are provided at each landing where the car 7 stops. The landing door 52 opens and closes an entrance and exit formed at the landing. The landing door switch 53 is a switch for detecting whether the landing door 52 is in a specific fully closed position. When the landing door 52 is in the fully closed position, the contact 53a of the landing door switch 53 is closed. When the landing door 52 is not in the fully closed position, the contact 53a of the landing door switch 53 is open. For example, when the landing door 52 on the first floor moves from the fully closed position, the contact 53a of the landing door switch 53 on the first floor is opened.

[0032] The contact 53a of the landing door switch 53 is included in the contact circuit 29. The contacts 53a included in the contact circuit 29 are connected in series. For example, if there are landing doors on each floor from the 1st floor to the 10th floor of a building, the elevator device is provided with 10 landing door switches 53. In such a case, the contact circuit 29 includes 10 contacts 53a connected in series, that is, the contact 53a of the landing door switch 53 on the 1st floor, the contact 53a of the landing door switch 53 on the 2nd floor, ···, and the contact 53a of the landing door switch 53 on the 10th floor.

[0033] The single-phase diode bridge circuit 30 is connected between the contact circuit 28 and the contact circuit 29. When the contact 51a and all the contacts 53a are closed, the AC voltage from the single-phase bridge inverter circuit 26 is input to the single-phase diode bridge circuit 30 through the contact circuit 28 and the contact circuit 29. The single-phase diode bridge circuit 30 is an example of a single-phase rectifier circuit. The single-phase diode bridge circuit 30 converts the 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. Note that FIG. 1 shows an example in which a smoothing capacitor is connected to the DC side of the single-phase diode bridge circuit 30.

[0034] The monitoring 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 includes a photocoupler as an element for detecting that the contact 51a of the car door switch 51 is short-circuited. That is, if the contact 51a is short-circuited, the AC voltage from the single-phase bridge inverter circuit 26 is supplied to the photocoupler of the monitoring circuit 31. When the AC voltage from the single-phase bridge inverter circuit 26 is supplied to the photocoupler, a detection signal is output from the monitoring circuit 31.

[0035] The monitoring 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 monitoring circuit 32 includes a photocoupler as an element for detecting that all the contacts 53a included in the contact circuit 29 are short-circuited. That is, if all the contacts 53a are short-circuited, an AC voltage from the single-phase bridge inverter circuit 26 is supplied to the photocoupler 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 monitoring circuit 32.

[0036] FIGS. 4 to 6 are diagrams for explaining the functions of the electrical safety device 23. FIGS. 4 to 6 show an example in which the electrical safety device 23 further includes a monitoring circuit 33. The monitoring circuit 33 is connected to the DC side of the single-phase diode bridge circuit 30. In the example shown in FIGS. 4 to 6, the monitoring circuit 33 includes a photocoupler. When a DC voltage from the single-phase diode bridge circuit 30 is supplied to the photocoupler, a detection signal is output from the monitoring circuit 33.

[0037] In the example shown in FIG. 4, the car door 50 and all the landing doors 52 are closed. That is, FIG. 4 shows an example in which the contact 51a and all the contacts 53a included in the contact circuit 29 are closed.

[0038] In the example shown in FIG. 4, an AC voltage from the single-phase bridge inverter circuit 26 is supplied to the single-phase diode bridge circuit 30. For this reason, a DC 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.

[0039] In the example shown in FIG. 4, a DC voltage from the single-phase diode bridge circuit 30 is supplied to the photocoupler of the monitoring circuit 33. For this reason, a detection signal is output from the monitoring circuit 33.

[0040] Furthermore, because contact 51a is closed, AC voltage from single-phase bridge inverter circuit 26 is supplied to the photocoupler of monitoring circuit 31. This causes a detection signal to be output from monitoring circuit 31. Similarly, because all contacts 53a included in contact circuit 29 are closed, AC voltage from single-phase bridge inverter circuit 26 is supplied to the photocoupler of monitoring circuit 32. This causes a detection signal to be output from monitoring circuit 32.

[0041] In the example shown in Fig. 5 and Fig. 6, the car door 50 and a landing door 52 of a certain floor are open. In the explanation of Fig. 5 and Fig. 6, the contact of the landing door switch 53 for detecting that the open landing door 52 is in the fully closed position is referred to as "contact 53b" to distinguish it from the other contact 53a. That is, in Fig. 5 and Fig. 6, the contact 53a represents the closed contact.

[0042] Fig. 5 shows an example in which the contact 51a of the car door switch 51 is open, but for some reason the contact 51a is short-circuited. In the example shown in Fig. 5, the contact 53b is open. Therefore, no voltage is generated on the DC side of the single-phase diode bridge circuit 30. In other words, no DC voltage is supplied from the single-phase diode bridge circuit 30 to the power supply circuit 19. No detection signal is output from the monitoring circuit 33.

[0043] On the other hand, because contact 51a of car door switch 51 is short-circuited, a voltage is generated in monitoring circuit 31. As a result, a detection signal is output from monitoring circuit 31. Furthermore, because contact 53b is open, no voltage is generated in monitoring circuit 32. As a result, no detection signal is output from monitoring circuit 32.

[0044] 6 shows an example in which contact 53b itself is open, but contact 53b is short-circuited for some reason. In the example shown in FIG. 6, contact 51a is open. Therefore, no voltage is generated on the DC side of single-phase diode bridge circuit 30. In other words, no DC voltage is supplied from single-phase diode bridge circuit 30 to power supply circuit 19. No detection signal is output from monitoring circuit 33.

[0045] On the other hand, since contact 53b is short-circuited, a voltage is generated in monitoring circuit 32. As a result, a detection signal is output from monitoring circuit 32. Furthermore, since contact 51a is open, no voltage is generated in monitoring circuit 31. As a result, no detection signal is output from monitoring circuit 31.

[0046] 6, if the contact 53b is not short-circuited, no voltage is generated on the DC side of the single-phase diode bridge circuit 30. No voltage is generated in the monitoring circuit 31. No voltage is generated in the monitoring circuit 32. Therefore, no detection signal is output from any of the monitoring circuits 31 to 33.

[0047] In the example shown in this embodiment, when contact 51a and all of contacts 53a are closed, single-phase diode bridge circuit 30 converts the AC voltage input from single-phase bridge inverter circuit 26 via contact circuits 28 and 29 into DC voltage. Therefore, there is no need to provide a relay relay in electrical safety device 23. Furthermore, there is no need to connect contact circuits 28 and 29 in series, which simplifies wiring. In the example shown in this embodiment, the cost required for electrical safety device 23 can be reduced.

[0048] In the example shown in this embodiment, the open / closed state of contact circuit 28 can be independently monitored by monitoring circuit 31. The open / closed state of contact circuit 29 can be independently monitored by monitoring circuit 32. For this reason, for example, as shown in FIG. 5, it is possible to detect a short circuit of contact 51a when car door 50 and landing door 52 of a certain floor are open. Also, as shown in FIG. 6, it is possible to detect a short circuit of contact 53b when car door 50 and landing door 52 of a certain floor are open.

[0049] In the example shown in this embodiment, the DC voltage converted by the single-phase diode bridge circuit 30 is supplied to the power supply circuit 19. Therefore, there is no need to provide a contactor to stop the power supply to the hoisting machine 10.

[0050] Figs. 7 and 8 are diagrams showing another example of the elevator apparatus according to Embodiment 1. In the following, only the points different from the examples shown in Figs. 1 and 2 will be described in detail.

[0051] In the elevator apparatus, a resistor 34 and a switching element 35 are connected in series between three buses. Fig. 7 shows an example in which an IGBT is adopted 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 necessary, and the power supplied to the bus 3 is consumed by the resistor 34.

[0052] A control circuit 36 controls the switching element 35. In the example shown in Fig. 7, a DC voltage from a power supply circuit 24 is supplied to the control circuit 36. Fig. 7 shows an example in which the DC voltage from the power supply circuit 24 is also supplied to the control circuits 18 and 27.

[0053] In the examples shown in Figs. 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.

[0054] Fig. 8 shows an example in which the inverter circuit 5 is realized by an IPM (Intelligent Power Module) for driving the motor 12. The drive circuit 39 is a gate drive circuit for driving the switching elements included in the upper arm of the inverter circuit 5. The drive circuit 39 is connected to each gate driver among the gate drivers (GD) included in the IPM and connected to the switching elements included in the upper arm of the inverter circuit 5.

[0055] The drive circuit 40 is a gate drive circuit for driving the switching elements included in the lower arm of the inverter circuit 5. The drive circuit 40 is connected to the gate driver among the gate drivers included in the IPM and connected to the switching elements included in the lower arm of the inverter circuit 5.

[0056] Further, FIG. 8 shows an example in which the inverter function of the DC-DC converter 15 is realized by an IPM for power supply to the brake device 13. The drive circuit 41 is a gate drive circuit for driving the switching elements included in the upper arm of the single-phase bridge inverter circuit 20. The drive circuit 41 is connected to each gate driver included in the IPM and connected to the switching elements included in the upper arm of the single-phase bridge inverter circuit 20.

[0057] The drive circuit 42 is a gate drive circuit for driving the switching elements included in the lower arm of the single-phase bridge inverter circuit 20. The drive circuit 42 is connected to the gate driver included in the IPM and connected to the switching elements included in the lower arm of the single-phase bridge inverter circuit 20.

[0058] The upper arm power supply circuit 37 is supplied with the DC voltage converted by the single-phase diode bridge circuit 30. The upper arm power supply circuit 37 is a circuit for providing the power necessary to drive 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 the drive circuit 39 with the DC voltage. Further, the upper arm power supply circuit 37 supplies the drive circuit 41 with the DC voltage.

[0059] The lower arm power supply circuit 38 is supplied with the DC voltage converted by the single-phase diode bridge circuit 30. The lower arm power supply circuit 38 is a circuit for providing the power necessary to drive 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 the drive circuit 40 with the DC voltage. Further, the lower arm power supply circuit 38 supplies the drive circuit 42 with the DC voltage. 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.

[0060] 8 shows an example in which the upper-arm power supply circuit 37 includes a switching element and a transformer. The transformer includes secondary coils corresponding to 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 coils corresponding to the three switching elements included in the upper arm of the inverter circuit 5. The AC voltages induced in these three secondary coils are rectified and smoothed, and then supplied to the corresponding gate drive circuits in the drive circuit 39.

[0061] 8, the upper arm power supply circuit 37 is provided with two secondary 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 these two secondary coils are rectified and smoothed, and then supplied to the corresponding gate drive circuits in the drive circuit 41.

[0062] 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 coil corresponding to the lower arm of the inverter circuit 5 is rectified and smoothed, and supplied to the drive circuit 40. The drive circuit 40 includes three gate drive circuits corresponding to the 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 these three gate drive circuits within the drive circuit 40.

[0063] Also, the AC voltage induced in the secondary 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 is provided with 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 these two gate drive circuits within the drive circuit 42.

[0064] In the examples shown in FIGS. 7 and 8, if voltage is not supplied from either the upper arm power supply circuit 37 or the lower arm power supply circuit 38, both the inverter circuit 5 and the single-phase bridge inverter circuit 20 stop. That is, the motor 12 stops, and the braking device 13 generates a braking force. Therefore, the safety of the elevator device can be enhanced.

[0065] In the examples shown in FIGS. 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.

[0066] FIG. 9 is a diagram showing another example of the elevator device in Embodiment 1. FIGS. 7 and 8 show examples where the control circuit 18 is supplied with a DC voltage from the power supply circuit 24. The control circuit 18 may be supplied with power based on the DC voltage from the single-phase diode bridge circuit 30. FIG. 9 shows an example where the control circuit 18 is supplied with a DC voltage from the power supply circuit 19.

[0067] In the example shown in FIG. 9, the transformer of the lower arm power supply circuit 38 is further provided with a secondary coil corresponding to the control circuit 18. The AC voltage induced in the secondary coil is rectified and smoothed, and supplied to the control circuit 18. The control circuit 18 is provided with a gate driver (GD) corresponding to the switching element included in the drive circuit 16 and a gate drive circuit. The DC voltage from the lower arm power supply circuit 38 is supplied to the gate drive circuit.

[0068] In the example shown in FIG. 9, if the voltage is not supplied from the lower arm power supply circuit 38, the control circuit 18 also stops. Therefore, the timing at which the braking device 13 generates the braking force can be further advanced. Thereby, the safety of the elevator device can be further enhanced.

[0069] As another example, the transformer of the upper arm power supply circuit 37 may be provided with 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

[0070] The electrical safety device according to the present disclosure can be applied to all types of elevator devices.

Explanation of Signs

[0071] 1 AC power supply, 2 converter circuit, 3 bus, 4 smoothing capacitor, 5 inverter circuit, 6 control circuit, 7 car, 8 counterweight, 9 rope, 10 hoisting machine, 11 driving sheave, 12 motor, 13 braking device, 14 brake coil, 15 DC-DC converter, 16 drive circuit, 17 - 18 control circuit, 19 power supply circuit, 20 single-phase bridge inverter circuit, 21 isolation transformer, 22 single-phase diode bridge circuit, 23 electrical safety device, 24 power supply circuit, 25 safety chain circuit, 26 single-phase bridge inverter circuit, 27 control circuit, 28 - 29 contact circuit, 30 single-phase diode bridge circuit, 31 - 33 monitoring circuit, 34 resistor, 35 switching element, 36 control circuit, 37 upper arm power supply circuit, 38 lower arm power supply circuit, 39 - 42 drive circuit, 50 car door, 51 car door switch, 51a contact, 52 landing door, 53 landing door switch, 53a contact

Claims

1. A single-phase bridge inverter circuit that converts a DC voltage from a safety chain circuit including a plurality of safety device contacts connected in series into an AC voltage, A first contact circuit including a first contact of a car door switch and connected to a first output on the AC side of the single-phase bridge inverter circuit, A second contact circuit including a plurality of second contacts of a landing door switch, the plurality of second contacts being connected in series and connected to a second output on the AC side of the single-phase bridge inverter circuit, A single-phase rectifier circuit that converts an AC voltage input from the single-phase bridge inverter circuit through the first contact circuit and the second contact circuit into a DC voltage when the first contact and the plurality of second contacts are closed, An elevator electrical safety device comprising the same.

2. A first monitoring circuit connected between the single-phase rectifier circuit side of the first contact circuit and the second output, A second monitoring circuit connected between the single-phase rectifier circuit side of the second contact circuit and the first output, The elevator electrical safety device according to claim 1, further comprising the same.

3. The electrical safety device according to claim 1 or claim 2, A converter circuit that converts an AC voltage from an AC power supply into a DC voltage, A smoothing capacitor connected to the DC side of the converter circuit, An inverter circuit that converts the DC voltage smoothed by the smoothing capacitor into an AC voltage and drives a motor of a hoist, An elevator device comprising the same.

4. The elevator device according to claim 3, wherein the electrical safety device further comprises a first power supply circuit that converts an AC voltage from the AC power supply into a DC voltage and supplies it to the safety chain circuit.

5. A first control circuit that controls the inverter circuit, A second power supply circuit that supplies a DC voltage to a circuit for driving a brake device of the hoist, A second control circuit that controls the second power supply circuit, A third power supply circuit that supplies a DC voltage to the first control circuit and the second control circuit, Further comprising, The elevator device according to claim 3 or claim 4, wherein the third power supply circuit is supplied with a DC voltage from the single-phase rectifier circuit.

6. The first control circuit, A first drive circuit for driving a switching element included in the upper arm of the inverter circuit, A second drive circuit for driving a switching element included in the lower arm of the inverter circuit, Comprising, The third power supply circuit, An upper arm power supply circuit that supplies a DC voltage to the first drive circuit, A lower arm power supply circuit that is provided independently of the upper arm power supply circuit and supplies a DC voltage to the second drive circuit, The elevator apparatus according to claim 5, comprising:

7. The second control circuit, A third drive circuit for driving a switching element included in the upper arm of the second power supply circuit, A fourth drive circuit for driving a switching element included in the lower arm of the second power supply circuit, Comprising, The upper arm power supply circuit supplies a DC voltage to the third drive circuit, The elevator apparatus according to claim 6, wherein the lower arm power supply circuit supplies a DC voltage to the fourth drive circuit.

8. Further comprising a third control circuit for controlling the circuit for driving the brake device, The elevator apparatus according to any one of claims 5 to 7, wherein the third power supply circuit supplies a DC voltage to the third control circuit.

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