CN116374756A

CN116374756A - Control device and control system for elevator

Info

Publication number: CN116374756A
Application number: CN202310340009.6A
Authority: CN
Inventors: 唐建峰; 朱梦义; 王小红
Original assignee: Kone Elevators Co Ltd; Kone Corp
Current assignee: Kone Elevators Co Ltd; Kone Corp
Priority date: 2023-03-31
Filing date: 2023-03-31
Publication date: 2023-07-04

Abstract

There is provided a control device for an elevator, comprising: a capacitor circuit for increasing a braking torque of the three-phase motor by communicating each phase terminal of the three-phase motor when connected to each phase terminal of the three-phase motor; a switching means for switching each phase terminal of the three-phase motor between the drive circuit and the capacitor circuit; and a detection section that, in response to receiving the test enable signal in a case where each phase terminal of the three-phase motor is switched to the capacitor circuit by the switching section, sequentially applies an excitation signal to one or more of a plurality of LC oscillating circuits in a brake circuit constituted by the capacitor circuit and each phase coil of the three-phase motor and detects whether LC oscillation is generated by the LC oscillating circuit to which the excitation signal is applied, and outputs a test pass signal to indicate that no open circuit exists in the brake circuit in a case where each of the plurality of LC oscillating circuits is detected to generate LC oscillation.

Description

Control device and control system for elevator

Technical Field

The present disclosure relates to a control device for an elevator and a control system including the control device.

Background

In some use scenarios of elevators, a situation in which a car is slipping may occur, and in order to limit the speed of the elevator car, one possible way is to short-circuit the phase terminals of the motor as hoisting machine of the elevator car when the motor is stopped to produce a braking torque limiting the speed of the elevator car, so that the normal operation of the braking loop is critical to the safety of the elevator car. However, due to the dark and moist use environment of the elevator, there may be a risk of the brake circuit being opened, for example by a wire being broken by a mouse. If there is an open circuit inside the brake circuit, its function of limiting the elevator car will not exist.

Disclosure of Invention

In view of the above, an aspect of the present disclosure provides a control device for an elevator, the control device including: a capacitor circuit for increasing a braking torque of the three-phase motor by communicating each phase terminal of the three-phase motor when connected to each phase terminal of the three-phase motor; a switching means for switching each phase terminal of the three-phase motor between the drive circuit and the capacitor circuit; and a detection section that, in response to receiving a test enable signal in a case where each phase terminal of the three-phase motor is switched to the capacitor circuit by the switching section, sequentially applies an excitation signal to one or more of a plurality of LC oscillating circuits in a brake circuit constituted by the capacitor circuit and each phase line of the three-phase motor and detects whether LC oscillation is generated by the LC oscillating circuit to which the excitation signal is applied, and outputs a test pass signal to indicate that no open circuit exists in the brake circuit in a case where each of the plurality of LC oscillating circuits generates LC oscillation.

Optionally, the detection means does not output any signal in case it is detected that at least one of the plurality of LC oscillating circuits does not generate LC oscillation.

Alternatively, the detection means does not generate the excitation signal upon detecting that one of the plurality of LC oscillating circuits does not generate LC oscillation.

Optionally, the detection means outputs a test failure signal including information indicating which LC oscillation circuits among the plurality of LC oscillation circuits have not detected LC oscillation in a case where it is detected that at least one of the plurality of LC oscillation circuits has not generated LC oscillation.

Optionally, the detecting component includes: a microcontroller that generates the stimulus signal for application to one of the plurality of LC oscillating circuits for the first time in response to receiving the test enable signal; and a detection circuit connected to each of the plurality of LC oscillation circuits to detect whether LC oscillation is generated in the LC oscillation circuit to which the excitation signal is applied, and to output a detection signal indicating whether the LC oscillation is detected to the microcontroller, wherein the microcontroller generates the excitation signal again to be applied to a next LC oscillation circuit of the plurality of LC oscillation circuits after receiving the detection signal, and the microcontroller outputs the test passing signal if each of the plurality of detection signals received respectively corresponding to the plurality of LC oscillation circuits indicates LC oscillation is detected.

Optionally, the excitation signal is a pulse width modulated signal, and the detection means further comprises a conversion circuit coupled between the microcontroller and the brake circuit for converting the pulse width modulated signal into a voltage signal or a current signal suitable for application to the LC tank circuit in the brake circuit.

Optionally, the detection circuit includes an operational amplifier and a comparator.

Optionally, the capacitor circuit comprises capacitors connected in a star or delta connection.

Optionally, the control device further comprises a power supply unit for supplying power to the control device.

Another aspect of the present disclosure provides a control system for an elevator, comprising a control device according to any one of the preceding claims and a main controller of the elevator for transmitting the test enable signal to the control device in case the elevator is idle.

Optionally, the main controller sends the test enable signal to the control device again in response to not receiving the test pass signal within a predetermined threshold period of time, and deactivates the elevator in response to not receiving the test pass signal a second time within a predetermined threshold period of time.

The control device and the control system of the embodiment of the disclosure further realize the function of detecting whether the brake loop is open or not on the basis of constructing the brake loop for limiting the speed of the elevator, and provide stronger guarantee for the use safety of the elevator.

Drawings

Aspects, features, and advantages of the present disclosure will become more apparent and more readily appreciated from the following description of the embodiments of the disclosure taken in conjunction with the accompanying drawings, in which:

FIG. 1 shows a schematic use scenario of a control device according to an embodiment of the present disclosure;

fig. 2A and 2B illustrate the operation principle of a detection part according to an embodiment of the present disclosure;

FIG. 3 shows a schematic block diagram of a detection component according to an embodiment of the present disclosure;

FIG. 4 shows a schematic block diagram of a control system according to an embodiment of the present disclosure; and

fig. 5 shows an example of a test enable signal and a test pass signal.

Detailed Description

The present disclosure will be described in detail below with reference to exemplary embodiments thereof. However, the present disclosure is not limited to the embodiments described herein, which may be embodied in many different forms. The described embodiments are intended only to provide a thorough and complete understanding of the present disclosure and to fully convey the concept of the present disclosure to those skilled in the art. Features of the various embodiments described may be combined with or substituted for one another, unless expressly excluded or excluded depending on the context.

Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

In the drawings, the same reference numerals denote constituent parts of the same or similar structures or functions, and a repetitive description thereof will be omitted from the following description.

Fig. 1 shows a schematic use scenario of a control device according to an embodiment of the present disclosure.

As shown in fig. 1, a three-phase motor M is used as a traction machine of an elevator, and drives a traction sheave 2 to rotate when energized. The traction sheave 2 is suspended at both ends thereof by traction ropes from the car 4 and the counterweight 5 of the elevator, respectively, the counterweight 5 having a mass smaller than the mass of the car 4, for example, half the mass of the car 4. The brake 3 mainly includes an electromagnet, a brake shoe, a hand brake, and the like (not shown in the drawings). Under the condition that the electromagnet is electrified, the brake pad releases the traction sheave 2, so that the traction sheave 2 can be driven by the three-phase motor M to rotate. Under the condition that the electromagnet is powered off, the brake pad holds the traction sheave 2 tightly, so that the traction sheave 2 cannot rotate. The hand brake of the brake 3 is used to release the brake shoe from the traction sheave 2 when manually pulled down. The drive circuit 6 is used to supply power to the three-phase motor M, and may include a three-phase ac power source 61, a main contactor 62, a frequency converter 63, and the like.

The control device 1 according to the embodiment of the present disclosure includes a capacitor circuit 11, a switching section 12, and a detecting section 13.

The principle of limiting the speed of the elevator car by means of the capacitor circuit 11 and the switching means 12 will be described first.

The capacitor circuit 11 is configured to increase the braking torque of the three-phase motor M by connecting the phase terminals u, v, w of the three-phase motor M when the capacitor circuit is connected to the phase terminals of the three-phase motor M. The capacitor circuit 11 includes capacitors connected in a star or delta connection. Fig. 1 exemplifies a capacitor circuit including a first capacitor C1, a second capacitor C2, and a third capacitor C3 connected in a delta manner, but the present disclosure is not limited thereto. Each of the first to third capacitors C1 to C3 may also include various modifications such as a plurality of capacitors connected in parallel, a plurality of capacitors connected in series, or a certain number of capacitors and inductors connected in series, or the like.

The switching means 12 is for switching each phase terminal u, v, w of the three-phase motor M between the drive circuit 6 and the capacitor circuit 11. For example, the switching component 12 includes a first set of switches S1-1, S1-2, and S1-3 and a second switch S2-1, S2-2, and S2-3 that are ganged. When the first set of switches S1-1, S1-2 and S1-3 in the switching section 12 are closed while the second set of switches S2-1, S2-2 and S2-3 are open, each phase terminal of the three-phase motor M is connected to the drive circuit 6 and disconnected from the capacitor circuit 11. When the first set of switches S1-1, S1-2 and S1-3 in the switching section 12 are open while the second set of switches S2-1, S2-2 and S2-3 are closed, the respective phase terminals of the three-phase motor M are connected to the capacitor circuit 11 and disconnected from the drive circuit 6. The present disclosure is not limited to the type of construction of the individual switches S1-1 to S1-3 and S2-1 to S2-3, for example they may be single pole single throw switches, single pole double throw switches, contactors, relays, solid state switches, etc.

When the elevator needs to start running, the switching means 12 closes the first set of switches S1-1, S1-2 and S1-3 and simultaneously opens the second set of switches S2-1, S2-2 and S2-3, and the phase terminals of the three-phase motor M are switched to be connected to the phase terminals of the drive circuit 6. The drive circuit 6 thus supplies three-phase currents to the three-phase motor M, which rotates the three-phase motor M at a certain rotational speed (e.g., a rated rotational speed), and thereby drives the traction sheave 2 to rotate, so that the elevator operation is realized.

When the elevator needs to be stopped, the switching means 12 opens the first set of switches S1-1, S1-2 and S1-3 and simultaneously closes the second set of switches S2-1, S2-2 and S2-3, and the phase terminals of the three-phase motor M are switched to be connected to the phase terminals of the capacitor circuit 11. The drive circuit 6 thereby stops supplying the three-phase current to the three-phase motor M. The first to third capacitors C1 to C3 in the capacitor circuit 11 constitute a braking circuit with each phase coil in the three-phase motor M. At this time, if the brake shoe in the brake 3 can hold the traction sheave 2, the three-phase motor M stops rotating, and no current flows through the brake circuit, thereby causing no influence. In contrast, if the brake shoe in the brake 3 cannot hold the traction sheave 2 due to aging, wear, or the like, or if the hand brake of the brake 3 is manually pulled down (for example, when rescue is required due to an elevator failure) to release the traction sheave 2, the three-phase motor M forcibly rotates under the action of unbalanced torque caused by a mass difference between the car 4 and the counterweight 5 to operate as a generator, and an induced voltage is generated inside the three-phase motor M. The induced voltage causes a current to flow in the brake circuit, thereby generating a braking torque. The braking torque opposes an unbalanced torque caused by a mass difference between the car 4 and the counterweight 5, and thereby limits the speed of the elevator to a predetermined range.

The principle of detecting whether an open circuit exists in the brake circuit by the detecting means 13 will be described below with reference to fig. 1, 2A and 2B.

Fig. 2A and 2B illustrate the operation principle of the detection part according to the embodiment of the present disclosure. Wherein two equivalent circuits of the brake circuit are shown in fig. 2A and 2B, respectively.

Referring to fig. 2A, there is shown an equivalent circuit of the brake circuit when the capacitors in the capacitor circuit 11 are connected in a delta connection. As shown, the brake circuit includes three LC tank circuits. The first LC oscillating circuit is constituted by the first capacitor C1, the u-phase coil Lu and the v-phase coil Lv of the three-phase motor M. The second LC oscillating circuit is constituted by the second capacitor C2, the v-phase coil Lv and the w-phase coil Lw of the three-phase motor M. The third LC oscillating circuit is constituted by the third capacitor C3, the u-phase coil Lu and the w-phase coil Lw of the three-phase motor M.

Referring to fig. 2B, there is shown an equivalent circuit of the brake circuit when the capacitors in the capacitor circuit 11 are connected in a star connection. As shown, the brake circuit also includes three LC tank circuits. The fourth LC oscillating circuit is constituted by the first capacitor C1, the second capacitor C2, the u-phase coil Lu and the v-phase coil Lv of the three-phase motor M. The fifth LC oscillating circuit is constituted by the second capacitor C2, the third capacitor C3, the v-phase coil Lv and the w-phase coil Lw of the three-phase motor M. The sixth LC oscillating circuit is constituted by the first capacitor C1, the third capacitor C3, the u-phase coil Lu and the w-phase coil Lw of the three-phase motor M.

The principle of detecting whether or not there is an open circuit in the brake circuit by the detecting means 13 is described only with reference to fig. 2A.

Referring to fig. 2A, the detecting section 13 sequentially applies an excitation signal test_in to one or more LC oscillating circuits among the first to third LC oscillating circuits IN response to receiving a Test ENABLE signal test_enable, and detects whether the LC oscillating circuit to which the excitation signal test_in is applied generates LC oscillation. The Test PASS signal test_pass is output in a case where an excitation signal is applied to each LC oscillation circuit and LC oscillation is detected to be generated in each LC oscillation circuit.

For example, as shown IN the figure, after receiving the Test ENABLE signal test_enable, the detecting section 13 first applies an excitation signal test_in, which forms a voltage between the terminal p1 and the terminal p2, to the first LC oscillating circuit constituted by the first capacitor C1, the u-phase coil Lu and the v-phase coil Lv of the three-phase motor M. The excitation signal test_in may be a voltage signal suitable for being applied between the terminal p1 and the terminal p2 directly, or may be another signal capable of being converted into a voltage signal suitable for being applied between the terminal p1 and the terminal p2, for example, a pulse width modulation signal. The pulse width modulated signal may be converted into a voltage signal suitable to be applied between the terminal p1 and the terminal p2 via a conversion circuit composed of components such as a solid state switch, a potentiometer, a relay, etc. And the present disclosure is not limited thereto, and other signals capable of causing the LC oscillating circuit to oscillate or causing the LC oscillating circuit to oscillate after appropriate conversion and adjustment may be employed as the excitation signal test_in. If there is no open circuit in the first LC oscillating circuit, once a voltage is formed between the terminal p1 and the terminal p2, an oscillation is generated in the first LC oscillating circuit, and the oscillation can be detected by the detecting section 13. If an open circuit exists in the first LC oscillating circuit, even if a voltage is formed between the terminal p1 and the terminal p2, no oscillation occurs in the first LC oscillating circuit.

After the detection of the first LC oscillating circuit, similarly, the detecting section 13 applies an excitation signal test_in to the second LC oscillating circuit constituted by the second capacitor C2, the v-phase coil Lv and the w-phase coil Lw of the three-phase motor M, the excitation signal test_in causing a voltage to be formed between the terminal p2 and the terminal p 3. If there is no open circuit in the second LC oscillating circuit, the second LC oscillating circuit will oscillate and is detected by the detecting means 13, and if there is an open circuit, the second LC oscillating circuit will not oscillate.

After the second LC oscillating circuit is detected, similarly, the detecting section 13 applies an excitation signal test_in to the third LC oscillating circuit constituted by the third capacitor C3, the u-phase coil Lu and the w-phase coil Lw of the three-phase motor M, and detects its oscillation IN the case where there is no open circuit IN the third LC oscillating circuit.

In the case where LC oscillation is detected in each of the first to third LC oscillation circuits, the detection section 13 outputs a Test PASS signal test_pass.

The Test ENABLE signal Test _ ENABLE in the above description may be received from an external device, which may be the main controller of the elevator or another device capable of detecting whether the elevator is idle or receiving an indication associated with whether the elevator is idle. The Test PASS signal Test PASS in the above description may be, for example, an audible or visual signal that can be heard or seen by the elevator manager and understood as the Test PASS, or a signal of various forms that is output to the external device for the external device to be heard or seen by the elevator manager and understood as the Test PASS audible or visual signal.

In one example, the detection section 13 sequentially applies an excitation signal to the first to third LC oscillating circuits, and does not output any signal in the case where LC oscillation is not detected in at least one of the first to third LC oscillating circuits. In this case, an external device such as an elevator main controller may be set to judge that the Test fails based on the Test PASS signal test_pass not being received within a predetermined threshold period of time, after which an audible or visual signal is emitted by the external device that can be heard or seen by the elevator administrator and understood as the Test failing. Further, in this example, in order to reduce power consumption and save resources, the detecting section 13 may be further configured to, upon detecting that one of the plurality of LC oscillating circuits does not generate LC oscillation, not generate an excitation signal to apply an excitation signal to the next oscillating circuit, nor output any signal. For example, the detection section 13 detects that it does not generate oscillation during the detection of the first LC oscillating circuit, and the detection section 13 does not regenerate the excitation signal to detect the second LC oscillating circuit, nor outputs any signal.

In another example, the elevator manager wishes to locate precisely the circuit part to be serviced in the brake circuit, the detection part 13 may apply the excitation signal to the first to third LC oscillating circuits in sequence, and output a Test failure signal test_fail in the case that no LC oscillation is detected in at least one of the first to third LC oscillating circuits, and include in the Test failure signal test_fail information indicating in which LC oscillating circuits no LC oscillation is detected. For example, the detection section 13 detects oscillation in the first LC oscillation circuit but does not detect oscillation in the second and third LC oscillation circuits, information reflecting that oscillation is not detected in the second and third LC oscillation circuits may be contained in the Test failure signal test_fail. The elevator manager may determine that an open circuit exists at the intersection of the second and third LC tank circuits based on the test failure signal.

Therefore, the control device according to the embodiment of the disclosure not only limits the sliding speed of the limited elevator by constructing the brake loop, but also detects whether an open circuit exists in the brake loop by the detection component, thereby providing additional guarantee for the function of limiting the sliding speed.

It should be understood that the number and location of ports p 1-p 3 shown in fig. 2A and 2B is not a limitation of the present disclosure. For example, although the first to sixth LC oscillating circuits are each shown as an LC parallel oscillating circuit in fig. 2A and 2B, the first to sixth LC oscillating circuits may be considered as LC series oscillating circuits. In the above description, the voltage signal is used as the start-up signal of the first to third LC oscillating circuits, but it is also possible to apply a current signal as the start-up signal via a resistor by adding a resistor to the first to sixth LC oscillating circuits, for example. Thus, different numbers and positions of ports are possible taking into account different configurations of LC tank circuits and different modes of starting. For simplicity, this disclosure is not exhaustive.

Further, the control device 1 may further include a power supply section shown in the drawing to supply power to the capacitor circuit 11, the switching section 12, and the detecting section 13. The power supply unit may be a unit that is coupled to the drive circuit 6 to perform power supply using a power supply from the drive circuit 6, or may be a unit that performs power supply using a power supply independent of the drive circuit 6.

Fig. 3 shows a schematic block diagram of a detection component according to an embodiment of the present disclosure. Wherein the components shown in dashed boxes are optional.

Referring to fig. 3, the detection section 13 includes a microcontroller 131 and a detection circuit 132, and may further include a conversion circuit 133, as an option.

Microcontroller 131 may be an integrated circuit containing a central processor, memory, input/output ports, and other peripherals or other devices or equipment capable of performing computing tasks such as analog and digital signal processing, with functions such as processing data, controlling input/output, performing logic operations, providing timing and counting, etc. The microcontroller 131 may be programmed using an assembly language such as X86, ARM, MIPS, powerPC and/or a high-level programming language such as C language, python, javaScript, ruby to implement the functionality described in this disclosure.

For example, as shown, the microcontroller 131 first generates and applies the excitation signal test_in to a first LC oscillating circuit composed of the first capacitor C1, the u-phase inductance Lu, and the V-phase inductance Lv. As described above, the excitation signal test_in may be a voltage signal directly applied between the ports p1 and p2, or other signals such as pulse width modulation signals that can be converted by the conversion circuit 133 into voltage signals suitable for application between the ports p1 and p 2. Alternatively, a conversion circuit 133 may be connected between the microcontroller 131 and the brake circuit for converting, for example, the excitation signal test_in generated by the microcontroller 131 into a voltage signal suitable for being applied between the ports p1 and p 2.

The detection circuit 132 may be a circuit including an operational amplifier, a comparator, and other electrical components (e.g., a resistor, a capacitor, a transistor, etc.) capable of identifying an oscillating voltage or an oscillating current in the LC oscillating circuit. The specific configuration of the detection circuit 132 is not limited by the present disclosure, as detectors and detection principles are well known to those skilled in the art.

For example, as shown, the detection circuit 132 is coupled between the microcontroller 131 and the brake circuit or between the conversion circuit 133 and the brake circuit through ports d1, d2, d 3. If the first LC tank circuit is not open, the detection circuit 132 will detect an oscillation (e.g., an oscillating voltage or an oscillating current) in the first LC tank circuit via ports d1 and d 2. The detection circuit 132 outputs a detection signal out_uv to the microcontroller 131, which can indicate whether or not an oscillation is detected in the first LC oscillation circuit. The microcontroller 131 determines whether LC oscillation is generated in the first LC oscillating circuit based on the detection signal out_uv.

After receiving the detection signal out_uv corresponding to the first LC oscillating circuit, the microcontroller 131 generates again the excitation signal test_in such that a voltage is applied between the second port p2 and the third port p 3. Similarly, if there is no open circuit in the second LC tank, the detector circuit 132 will detect oscillations in the second LC tank via ports d2 and d 3. The detection circuit 132 outputs a detection signal out_vw to the microcontroller 131, which can indicate whether an oscillation is detected in the second LC oscillating circuit. The microcontroller 131 determines whether LC oscillation is generated in the second LC oscillating circuit based on the detection signal out_vw.

After receiving the detection signal out_uw corresponding to the second LC oscillating circuit, the microcontroller 131 generates again the excitation signal test_in so that a voltage is applied between the ports p1 and p 3. Similarly, if there is no open circuit in the third LC tank, the detector circuit 132 will detect the oscillation in the third LC tank via the ports d1 and d 3. The detection circuit 132 outputs a detection signal out_uw to the microcontroller 131, which can indicate whether or not oscillation is detected in the third LC oscillation circuit. The microcontroller 131 determines whether LC oscillation is generated in the third LC oscillating circuit based on the detection signal out_uw.

The microcontroller 131 outputs a Test PASS signal test_pass in the case where three detection signals out_uv, out_vw and out_uw corresponding to the first to third LC oscillation circuits, respectively, all indicate that LC oscillation is generated.

In one example, the microcontroller 131 outputs the Test FAIL signal test_fail in a case where an excitation signal is sequentially applied to the first to third LC oscillation circuits and at least one of the three detection signals out_uv, out_vw, and out_uw indicates that no oscillation is generated. The Test FAIL signal test_fail may contain information indicating in which LC oscillating circuit or circuits no oscillation is detected. For example, the microcontroller 131 judges that an oscillation is detected in the first LC oscillating circuit and no oscillation is detected in the second and third LC oscillating circuits based on the detection signals out_uv, out_vw, and out_uw, and the microcontroller 131 may generate a Test failure signal test_fail containing information reflecting that no oscillation is detected in the second and third LC oscillating circuits. The elevator manager may determine that an open circuit exists at the intersection of the second and third LC tank circuits based on the test failure signal.

In another example, the elevator manager does not require to precisely locate the part of the brake circuit to be serviced, the microcontroller 131 may be programmed to stop working without outputting any signal if the excitation signal is applied to the first to third LC oscillating circuits in turn and at least one of the three detection signals out_uv, out_vw and out_uw indicates that no oscillation is generated. In this case, an external device such as an elevator main controller connected to the microcontroller 131 may judge that the Test fails according to the Test passing signal test_pass not being received for a predetermined threshold period of time, and then an audible or visual signal that can be heard or seen by an elevator manager and understood as the Test failure is emitted by the external device. Further, to save power consumption and resources, in this example, the microcontroller 131 may be further programmed to stop operation once a detection signal is detected indicating that the corresponding LC tank circuit is not generating oscillations, not to regenerate the excitation signal nor to output any signal. For example, upon receiving a detection out_uv indicating that no LC oscillation is generated in the first LC oscillating circuit, the microcontroller 131 does not regenerate an excitation signal to detect the second LC oscillating circuit, nor outputs any signal.

Therefore, the detection part in the control device 1 is constructed through the microcontroller 131 and the detection circuit 132, so that the control device has simple structure, low cost and strong practicability.

Having described the control device 1 according to the embodiment of the present disclosure, a control system including the control device 1 is described below with reference to fig. 4 and 5.

Fig. 4 shows a schematic block diagram of a control system for an elevator according to an embodiment of the disclosure. Fig. 5 shows an example of a test enable signal and a test pass signal.

Referring to fig. 4, a control system 40 according to an embodiment of the present disclosure includes a main controller 41 of an elevator and the aforementioned control apparatus 1. The elevator main controller 41 here refers to a device responsible for monitoring the operating state of the elevator, controlling the starting and stopping of the elevator, the direction change and the opening and closing of the car doors. The main controller 41 may comprise, for example, a central processor to control the operating state of the elevator and to monitor various parameters of the elevator, an integrated circuit to perform the transfer and conversion of signals between the central processor, relays, frequency converters etc. The main contactor 62 and the frequency converter 63 in fig. 1 may be part of the main controller 41.

In the embodiment of the present disclosure, the main controller 41 is electrically connected with the control device 1 to transmit the reception Test ENABLE signal test_enable to the control device 1 and receive the Test PASS signal test_pass from the control device 1 when the elevator is idle (as previously described, when the elevator is idle, the switching device 12 switches each phase terminal of the three-phase motor M to a capacitor circuit). In the case where the control apparatus 1 is configured to output the Test failure signal test_fail, the Test failure signal test_fail is also output to the main controller 41.

In one example, if the main controller 41 receives the Test PASS signal test_pass within a predetermined threshold period of time, it is considered that there is no open circuit in the brake circuit without changing the elevator status. In contrast, if the main controller 41 does not receive the Test PASS signal test_pass for a predetermined threshold period of time or receives the Test FAIL signal test_fail if the control device 1 is configured to output the Test FAIL signal test_fail, it is considered that an open circuit exists in the brake circuit, thereby stopping the elevator to be serviced.

As shown in diagrams 51 and 52 in fig. 5, given that the Test PASS signal test_pass is a pulse signal having a voltage of 5V and a pulse width of 10 seconds, the test_pass is a pulse signal having a voltage of 5V and a pulse width of 2 seconds, and thus the predetermined threshold period is 8 seconds. As shown, the main controller 41 receives the Test PASS signal Test PASS from the control device 1 within 7 seconds after the Test ENABLE signal test_enable is issued, and does not change the elevator status.

In another example, to ensure the accuracy of the detection, if the main controller 41 receives the Test FAIL signal test_pass in response to not receiving the Test PASS signal test_pass within a predetermined threshold period of time or receives the Test FAIL signal test_fail if the control apparatus 1 is configured to output the Test FAIL signal test_fail, the Test ENABLE signal test_enable is again transmitted to the control apparatus 1 to perform the detection again, and the elevator is stopped to be serviced if the Test PASS signal test_pass is not received for a predetermined time threshold for the second time or the Test FAIL signal test_fail is received for the second time.

As shown in diagrams 53 and 54 in fig. 5, given that the Test PASS signal test_pass is a pulse signal having a voltage of 5V and a pulse width of 10 seconds, the test_pass is a pulse signal having a voltage of 5V and a pulse width of 2 seconds, and thus the predetermined threshold period is 8 seconds. As shown, the main controller 41 does not receive any signal from the control device 1 within 8 seconds after issuing the Test ENABLE signal test_enable, and then sends the Test ENABLE signal test_enable to the control device 1 again after being spaced from the pulse of the last test_pass by a predetermined period of time (3 seconds as shown in the figure). After 7 seconds have elapsed, the Test PASS signal Test PASS is received and the elevator status is not changed.

The example of fig. 5 is for illustration purposes only, and the present disclosure is not limited to the form of the test enable signal and the test pass signal and the duration of the predetermined threshold period of time.

Therefore, the control device and the control system according to the embodiment of the disclosure not only provide the function of limiting the elevator sliding speed, but also provide additional guarantee for the normal operation of the function, and improve the overall safety of the elevator.

The block diagrams of circuits, devices, apparatuses, devices, systems referred to in this disclosure are only illustrative examples and are not intended to require or imply that connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, these circuits, devices, apparatuses, devices, systems may be connected, arranged, configured in any manner so long as the desired purpose is achieved.

It will be appreciated by persons skilled in the art that the above-described embodiments are merely examples and that various modifications, combinations, partial combinations and substitutions may be made to the embodiments of the present disclosure according to design requirements and other factors, provided that they fall within the scope of the appended claims or their equivalents, i.e., within the scope of the claims to be protected by the present disclosure.

Claims

1. A control device for an elevator, which elevator is served as its hoisting machine by a three-phase motor and which three-phase motor is supplied by a drive circuit, the control device comprising:

a capacitor circuit for increasing a braking torque of the three-phase motor by communicating each phase terminal of the three-phase motor when connected to each phase terminal of the three-phase motor;

a switching means for switching each phase terminal of the three-phase motor between the drive circuit and the capacitor circuit; and

and a detection section that, in response to receiving a test enable signal in a case where each phase terminal of the three-phase motor is switched to the capacitor circuit by the switching section, sequentially applies an excitation signal to one or more of a plurality of LC oscillating circuits in a brake circuit constituted by the capacitor circuit and each phase line of the three-phase motor and detects whether LC oscillation is generated in the LC oscillating circuit to which the excitation signal is applied, and outputs a test pass signal to indicate that no open circuit exists in the brake circuit in a case where LC oscillation is generated in each of the plurality of LC oscillating circuits.

2. The control device according to claim 1, wherein,

the detection section does not output any signal in the case where it is detected that at least one of the plurality of LC oscillation circuits does not generate LC oscillation.

3. The control device according to claim 2, wherein,

the detection means does not generate an excitation signal upon detecting that one of the plurality of LC oscillating circuits does not generate LC oscillation.

4. The control device according to claim 1, wherein,

the detection section outputs a test failure signal including information indicating which LC oscillation circuits among the plurality of LC oscillation circuits have not detected LC oscillation in a case where it is detected that at least one of the plurality of LC oscillation circuits has not generated LC oscillation.

5. The control device according to claim 1, wherein the detecting means includes:

a microcontroller that generates the stimulus signal for application to one of the plurality of LC oscillating circuits for the first time in response to receiving the test enable signal; and

a detection circuit connected to each of the plurality of LC oscillation circuits to detect whether LC oscillation is generated in the LC oscillation circuit to which the excitation signal is applied, and outputting a detection signal indicating whether the LC oscillation is detected to the microcontroller,

wherein the microcontroller generates the excitation signal again to be applied to a next LC oscillating circuit among the plurality of LC oscillating circuits after receiving the detection signals, and outputs the test passing signal if each of the plurality of detection signals received respectively corresponding to the plurality of LC oscillating circuits indicates that LC oscillation is detected.

6. The control device according to claim 5, the excitation signal being a pulse width modulated signal, the detection means further comprising:

a conversion circuit coupled between the microcontroller and the brake circuit for converting the pulse width modulated signal into a voltage signal or a current signal suitable for application to the LC tank in the brake circuit.

7. The control device according to claim 5, wherein,

the detection circuit includes an operational amplifier and a comparator.

8. The control device according to claim 1, wherein,

the capacitor circuit includes capacitors connected in a star or delta connection.

9. The control device according to claim 1, further comprising:

and the power supply component is used for supplying power to the control device.

10. A control system for an elevator, comprising:

the control device according to any one of claims 1 to 9;

and the main controller is used for sending the test permission signal to the control device under the condition that the elevator is idle.

11. The control system of claim 10, wherein,

the main controller transmits the test enable signal again to the control device in response to the test pass signal not being received within a predetermined threshold period of time, and deactivates the elevator in response to the test pass signal not being received a second time within a predetermined threshold period of time.