CN109292556B - Control method and device of elevator brake, band-type brake power supply and storage medium - Google Patents

Abstract

The invention discloses a control method and device of an elevator brake, a band-type brake power supply and a storage medium. The method comprises the following steps: in the brake opening process of an elevator brake, acquiring the signal intensity of an electric signal input to the brake by a converter, wherein the converter is an alternating current/direct current converter and is connected in series between the brake and an alternating current power supply, and the brake opening process comprises a strong excitation stage and a weak excitation stage; and if the signal intensity is out of the normal signal intensity range of the brake at the current stage, adjusting the brake to be in a closing state according to a preset rule. By adopting the technical scheme, the embodiment of the invention can improve the safety factor of the elevator and the service life of the elevator brake and reduce the maintenance cost of the elevator brake.

Description

Control method and device of elevator brake, band-type brake power supply and storage medium

Technical Field

The invention relates to the technical field of elevator control, in particular to a control method and device of an elevator brake, a band-type brake power supply and a storage medium.

Background

At present, elevator band-type brake power supplies mainly comprise a constant-voltage type band-type brake power supply and a constant-current type band-type brake power supply (as shown in figure 1). The constant-voltage band-type brake power supply generally achieves the purpose of constant-voltage control through the cooperation of the power frequency transformer and the rectifying circuit. However, since the output of the constant voltage type band-type brake power supply is affected by the power grid fluctuation and the temperature rise of the brake coil, a large margin needs to be set, which leads to an increase in the cost of the band-type brake power supply. Therefore, in practical applications, the constant voltage type band-type brake power supply is generally used only for controlling the high-impedance brake. Because of the influence of factors such as brake design and processing cost, the elevator brake mostly adopts a low-impedance coil, and therefore, compared with a constant-voltage band-type brake power supply, the constant-current band-type brake power supply has stronger practicability.

The constant current type band-type brake power supply mainly adopts silicon controlled rectifier power frequency rectification control or high-frequency constant current control, but no matter what constant current control mode is adopted, the problem that the output current is larger or smaller can exist in practical application. The larger output current can cause the temperature rise amplitude of the brake coil to be larger, the aging of the coil can be accelerated after the brake coil is operated for a long time, the burning of the brake coil can be caused seriously, and the maintenance cost of the elevator is greatly increased; the output current is small, so that the elevator drags a brake to run, and the brake shoe of the brake is abraded due to long-time dragging of the brake, so that the side length of the emergency stop distance of the brake is long, and the safety of the elevator and passengers of the elevator is seriously endangered.

Disclosure of Invention

In view of this, embodiments of the present invention provide a method and an apparatus for controlling an elevator brake, a band-type brake power supply, and a storage medium, so as to improve the service life of the elevator brake.

In a first aspect, an embodiment of the present invention provides a control method for an elevator brake, including:

in the brake opening process of an elevator brake, acquiring the signal intensity of an electric signal input to the brake by a converter, wherein the converter is an alternating current/direct current converter and is connected in series between the brake and an alternating current power supply, and the brake opening process comprises a strong excitation stage and a weak excitation stage;

and if the signal intensity is out of the normal signal intensity range of the brake at the current stage, adjusting the brake to be in a closing state according to a preset rule.

In a second aspect, an embodiment of the present invention provides a control device for an elevator brake, including:

the system comprises a signal intensity acquisition module, a control module and a control module, wherein the signal intensity acquisition module is used for acquiring the signal intensity of an electric signal input to a brake by a converter in the brake opening process of an elevator brake, the converter is an alternating current/direct current converter and is connected in series between the brake and an alternating current power supply, and the brake opening process comprises a strong excitation stage and a weak excitation stage;

and the state adjusting module is used for adjusting the brake to be in a closing state according to a preset rule when the signal intensity is out of the normal signal intensity range of the brake at the current stage.

In a third aspect, an embodiment of the present invention provides an elevator brake power supply, including a converter connected in series between an elevator brake and an ac power supply, further including:

one or more processors;

a memory for storing one or more programs,

when the one or more programs are executed by the one or more processors, the one or more processors implement the control method of the elevator brake according to the embodiment of the present invention.

In a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, wherein the program is implemented by a processor to implement the control method of the elevator brake according to the embodiment of the present invention.

In the technical scheme for controlling the elevator brake, the signal intensity of an electric signal input to the brake by a converter is obtained in the brake opening process of the elevator brake, and the brake is adjusted to be in a switch-on state when the signal intensity is out of the normal signal intensity range of the brake at the current stage. By adopting the technical scheme, when the signal intensity is out of the normal signal intensity range, the brake is closed, the safety factor of the elevator and the service life of the brake of the elevator can be improved, the loss of the brake is reduced, the service life of the brake is prolonged, and the maintenance cost of the brake is reduced.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

fig. 1 is a constant current band-type brake power supply for an elevator in the prior art;

fig. 2 is a schematic flow chart of a control method of an elevator brake according to an embodiment of the present invention;

fig. 3 is a flow chart of a control method of an elevator brake according to a second embodiment of the present invention;

fig. 4 is a schematic flow chart of a control method of an elevator brake according to a third embodiment of the present invention;

fig. 5A is a schematic flow chart of a preferred control method of an elevator brake according to a fourth embodiment of the present invention;

fig. 5B is a timing chart of the elevator brake control according to the fourth embodiment of the present invention;

fig. 6 is a block diagram showing a control apparatus of an elevator brake according to a fifth embodiment of the present invention;

fig. 7 is a schematic structural diagram of an elevator band-type brake power supply according to a sixth embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.

Example one

The embodiment of the invention provides a control method of an elevator brake. The method can be carried out by a control device of the elevator brake, wherein the device can be implemented by software and/or hardware and can be integrated into the elevator brake power supply in general. Fig. 2 is a schematic flow chart of a control method of an elevator brake according to an embodiment of the present invention, as shown in fig. 2, the method includes:

s110, in the process of opening a brake of the elevator brake, obtaining the signal intensity of an electric signal input to the brake by a converter, wherein the converter is an alternating current/direct current converter and is connected in series between the brake and an alternating current power supply, and the process of opening the brake comprises a strong excitation stage and a weak excitation stage.

In this embodiment, the signal strength of the electric signal input to the brake by the converter may be obtained only during the opening of the elevator brake, or may be obtained after the elevator is powered on. Since the signal strength of the electrical signal input by the converter to the brake is zero only when the converter inputs the electrical signal to the brake during opening of the elevator brake, i.e. when the elevator brake is not in the process of opening, it is preferable to obtain the signal strength of the electrical signal input by the converter to the brake only during opening of the elevator brake, in order to reduce the amount of calculation required to obtain the signal strength.

The method for judging whether the elevator brake is in the opening process can be set according to requirements, such as whether the elevator brake is in the opening process can be judged based on the pressure of the brake on the elevator, whether the elevator runs, whether a command for controlling the brake to open or controlling a converter to input an electric signal to the brake is generated and sent, whether an opening command initiated by an elevator main control system is received, and the like.

When the signal intensity is obtained, the intensity of the electric signal input to the brake by the transducer may be directly detected, or the intensity of the electric signal input to the brake by the transducer may be detected by another device. Taking the example of detecting the signal intensity of the electrical signal input to the brake by the converter through other devices, such as a current detection circuit in the band-type brake power supply, the current detection circuit may detect the signal intensity of the electrical signal input to the brake by the converter in real time or according to a set period, and send the detected signal intensity to the control device in real time or according to the set period or when the signal intensity changes, and accordingly, the control device may receive the signal intensity sent by the current detection circuit and perform subsequent operations.

Here, the signal intensity of the electrical signal may be a voltage intensity of the detected electrical signal (i.e., a detection voltage intensity) and/or a current intensity of the detected electrical signal (i.e., a detection current intensity). In order to further improve the accuracy of the subsequent adjustment of the brake to the closing state, preferably, the type of the signal strength of the electric signal may be determined according to the control mode of the elevator brake at the current stage of the opening process, that is, when the signal strength of the electric signal input to the brake by the converter is obtained, the control mode of the brake at the current stage may be determined, and the signal strength of the electric signal input to the brake by the converter is obtained according to the control mode. The control mode can be constant voltage control or constant current control. For example, when the control mode is constant voltage control, the signal intensity may be a detection voltage intensity; when the control mode is constant current control, the signal intensity may be a detection current intensity. Hereinafter, the control mode is a constant current control mode, and the signal intensity is a detection current intensity.

And S120, if the signal intensity is out of the normal signal intensity range of the brake at the current stage, adjusting the brake to be in a closing state according to a preset rule.

In this step, the current stage is a brake-off stage of the brake-off process where the brake is currently located, such as a strong excitation stage or a weak excitation stage. Namely, if the brake is currently in the strong excitation stage, when the signal intensity is out of the normal signal intensity range of the brake in the strong excitation stage, the brake is adjusted to be in a closing state according to the adjustment rule of the strong excitation stage; and if the brake is in the weak excitation stage at present, when the signal intensity is out of the normal signal intensity range of the brake in the weak excitation stage, adjusting the brake to be in a closing state according to the adjustment rule of the weak excitation stage. The normal signal intensity ranges of the brake in the strong excitation stage and the weak excitation stage can be set as required; the regulation rule of the brake in the strong excitation stage and/or the weak excitation stage can be that the elevator is stopped immediately or is stopped nearby, and the two can be the same or different.

According to the control method of the elevator brake provided by the embodiment of the invention, in the brake opening process of the elevator brake, the signal intensity of an electric signal input to the brake by a converter is obtained, and when the signal intensity is out of the normal signal intensity range of the brake at the current stage, the brake is adjusted to be in a switch-on state. This embodiment is through adopting above-mentioned technical scheme, and when signal strength was located outside the normal signal strength scope, closing the stopper, can improve the factor of safety of elevator and the life of elevator stopper, reduces the loss of stopper, prolongs the life of stopper, reduces the cost of maintenance of stopper.

On the basis of the above embodiment, after the brake is adjusted to the closing state according to the set rule, the method further includes: and generating a fault warning message and feeding the fault warning message back to an elevator master control system. In this embodiment, after the brake is adjusted to the closing state, the current fault information may be carried in the fault warning message and reported to the elevator main control system, so that the elevator main control system records the current fault information, so that the worker can check the current fault information, and/or notify the maintenance worker to overhaul the elevator. The fault information may include one or more of a fault type (e.g., too large or too small current), a stage of the fault, and a signal strength when the fault occurs.

Example two

Fig. 3 is a flowchart illustrating a control method for an elevator brake according to a second embodiment of the present invention. In this embodiment, a process of adjusting the brake to the closed state is detailed based on the above embodiment, and as shown in fig. 3, the method for controlling the elevator brake provided in this embodiment includes:

s210, in the process of opening the brake of the elevator, determining the constant current control of the brake at the current stage, acquiring the detected current intensity of an electric signal input to the brake by a converter, and executing S220 or S230, wherein the converter is an alternating current/direct current converter and is connected in series between the brake and an alternating current power supply, and the process of opening the brake comprises a strong excitation stage and a weak excitation stage.

And S220, if the current stage is a strong excitation stage and the detected current intensity is greater than the maximum current threshold value of the brake strong excitation stage, sending a blocking instruction to a blocking output circuit to instruct the blocking output circuit to block the output of the converter, and finishing the operation.

Correspondingly, if the current stage is a strong excitation stage and the detected current intensity is smaller than the maximum current threshold value of the brake strong excitation stage, returning to execute the operation of acquiring the detected current intensity of the electric signal input to the brake by the converter.

The maximum current threshold value of the brake strong excitation stage can be set according to requirements, for example, the maximum current threshold value can be set to be 1.2 times or 1.3 times of the first theoretical current intensity; the lockout output circuit can be directly connected with the converter and directly lockout the output of the converter based on the instruction of the control device, and can also be connected between the control device and a Pulse Width Modulation (PWM) control circuit connected with the converter and used for lockout the output of the converter by lockout the output of the PWM control circuit.

For example, after acquiring the detected current intensity of the electric signal input to the brake by the converter, the control device determines that the current stage of the brake is a strong excitation stage, and judges whether the detected current intensity is greater than the maximum current threshold value of the strong excitation stage, if not, the control device does not generate a blocking instruction; if yes, a blocking instruction is generated and sent to a blocking output circuit, the blocking output circuit generates a stopping input instruction when receiving the blocking instruction and sends the stopping output instruction to a PWM control circuit, the PWM control circuit stops inputting pulses to the converter when receiving the stopping output instruction sent by the blocking output circuit, the converter stops inputting electric signals to the brake, the brake is switched on, and the elevator immediately stops. Whether the brake is in the strong excitation stage can be determined by judging whether the control device sends a control signal for controlling the brake to be converted into the weak excitation stage to the brake and whether the time length after the control signal is sent is less than the set time length, and if the control signal for controlling the brake to be converted into the weak excitation stage is not sent to the brake in the brake opening process or the time length after the control signal is sent is less than the set time length, the brake is judged to be in the strong excitation stage, so that a certain response time is reserved for the brake.

And S230, if the current stage is a weak excitation stage and the detected current intensity is out of the normal threshold range of the brake weak excitation stage current, determining a target floor which is closest to the current position in the running direction according to the current position of the elevator and the running direction of the elevator, and sending a blocking instruction to a blocking output circuit to instruct the blocking output circuit to block the output of the converter when the elevator runs to the target floor.

Correspondingly, if the current stage is a weak excitation stage and the detected current intensity is within the range of the syndrome threshold value of the current in the weak excitation stage of the brake, returning to execute the operation of acquiring the detected current intensity of the electric signal input to the brake by the converter.

In this embodiment, the normal threshold range of the brake weak excitation stage may be set as required, for example, may be set to 80% of the second theoretical current intensity to 120% of the second theoretical current intensity; the target floor is determined according to the current position and the running direction of the elevator, for example, if the elevator is currently located between the 4 th floor and the 5 th floor, if the running direction of the elevator is upward, the target floor is the 5 th floor; if the running direction of the elevator is downward, the destination floor is 4 floors.

For example, after obtaining the detected current intensity of the electric signal input to the brake by the converter, the control device determines that the current stage of the brake is the weak excitation stage, and determines whether the detected current intensity is within the normal threshold range of the weak excitation stage, if so, the control device does not execute the subsequent operation; if not, determining the current position and the running direction of the elevator through a speed sensor and/or an acceleration sensor arranged on the elevator, or requesting to obtain the current position and the running direction of the elevator from an elevator main control system, determining a target floor according to the current position and the running direction, generating a blocking instruction when the elevator runs to the target floor, and sending the blocking instruction to a blocking output circuit; when the lockout output circuit receives the lockout instruction, a stop input instruction is generated, and the stop output instruction is sent to the PWM control circuit; when the PWM control circuit receives an output stopping instruction sent by the blocking output circuit, the pulse input to the converter is stopped, the converter stops inputting electric signals to the brake, and the brake is switched on, so that the aim of controlling the elevator to stop nearby is fulfilled. Whether the brake is in the strong excitation stage can be determined by judging whether a control device sends a control signal for controlling the brake to be converted into the weak excitation stage to the brake and whether the time length after the control signal is sent is less than a set time length, and if the time length after the brake sends the control signal for controlling the brake to be converted into the weak excitation stage to the brake in the brake opening process is greater than or equal to the set time length, the brake is judged to be in the weak excitation stage so as to ensure that the brake completes the conversion from the strong excitation stage to the weak excitation stage.

In the step, in the weak excitation stage, the control device can control the elevator to stop nearby when the detected current value is out of the normal threshold range of the current in the weak excitation stage of the brake; and when the detected current value is determined to be out of the normal threshold range of the current in the weak excitation stage of the brake, whether the detected current is larger than the maximum current threshold in the strong excitation stage or not can be further judged, if so, the elevator is controlled to stop immediately, and if not, the elevator is controlled to stop nearby, so that the safety coefficient of the elevator is further improved, and the loss of the brake of the elevator is reduced.

The control method of the elevator brake provided by the embodiment of the invention controls the elevator to immediately stop when the brake is in the strong excitation stage and the intensity of the detected current input to the brake by the converter exceeds the maximum current threshold value of the strong excitation stage of the brake, controls the elevator to stop nearby when the brake is in the weak excitation stage and the intensity of the detected current input to the brake by the converter is out of the normal threshold value range of the weak excitation stage of the brake, can further improve the safety factor of the elevator and the service life of the elevator brake,

EXAMPLE III

Fig. 4 is a flowchart illustrating a control method of an elevator brake according to a third embodiment of the present invention. In this embodiment, a switching process of strong and weak excitation of a brake and a control process of a weak excitation protection circuit are added on the basis of the above embodiment, as shown in fig. 4, the control method of an elevator brake provided in this embodiment includes:

s310, when a brake opening command sent by an elevator main control system is received, the control parameters of the brake of the elevator are obtained.

In this embodiment, the elevator main control system may generate an opening instruction when a passenger triggers (e.g., clicks a button on a floor) to generate an elevator riding instruction or needs to control the elevator to move to a floor based on a control logic of the elevator itself, and directly or indirectly send the opening instruction to the control device of the elevator brake, e.g., directly establish a connection with the control device and send the generated opening instruction to the control device through the connection, or send the opening instruction to another module or device (e.g., a control and feedback interface circuit in a band-type brake power supply integrated with the control device) to send the opening instruction to the control device through the other module or device. Correspondingly, the control device can acquire the control parameters of the elevator brake after receiving the opening command directly or indirectly sent by the elevator master control system.

In this embodiment, the control parameters of the brake may include the theoretical voltage intensity and/or the theoretical current intensity of the brake at each stage of the brake opening process, and the duration of the strong excitation stage. The control parameters of the brake can be set by the operator (e.g. input via an input device of the elevator master control or an input device of the brake power supply) or can be set by the control device or the elevator master control system according to a given setting rule based on the impedance of the brake. When the control parameters are set for each brake, only one group of control parameters can be set for each brake, and a plurality of groups of different control parameters can also be set for each brake, so that the brakes of the elevator can be controlled by adopting different control parameters in different application scenes, and the requirements of passengers or workers in different scenes can be met.

In practical application, the set control parameters can be pre-stored in a local brake power supply or carried in a brake opening instruction. Correspondingly, the control device can obtain the control parameters of the brake locally from the band-type brake power supply, and can also analyze the brake opening instruction to obtain the control parameters of the brake. Considering that the brake controlled by the band-type brake power supply is generally fixed after the band-type brake power supply is configured, it is preferable that the control parameters of the brake controlled by the band-type brake power supply are preset and stored in the band-type brake power supply, so as to simplify the brake opening command and reduce the operation required for transmitting the brake opening command.

Wherein the opening command may or may not contain identification information of the elevator or the elevator brake. For example, when the control device controls only one elevator, the brake opening instruction may not include identification information of the elevator or the elevator brake, and at this time, the control device may directly obtain the control parameters of the brake of the elevator controlled by the control device after receiving the brake opening instruction; when the control device controls a plurality of elevators, the brake opening instruction preferably comprises identification information of the elevator or the elevator brake to be controlled at the time, so that after the control device receives the brake opening instruction, the brake needing to be controlled at the time can be determined according to the identification information carried in the brake opening instruction, and the control parameter of the brake can be obtained.

In addition, when the brake has multiple groups of control parameters, the opening instruction preferably carries group information of the brake control parameters, so that the control device can determine the control parameters adopted in the current brake control according to the information after receiving the opening instruction. At the moment, the elevator master control system can carry the group information of the control parameters in the opening command when sending the opening command each time; the default adopted control parameters can also be preset, when the control parameters are the same as the default adopted control parameters, the group information of the control parameters is not carried in the brake opening instruction, when the control parameters are different from the default adopted control parameters, the group information of the adopted control parameters is carried in the brake opening instruction, correspondingly, after the control device receives the brake opening instruction, whether the brake opening instruction carries the group information of the control parameters or not is judged, if yes, the control parameters of the group corresponding to the group information are adopted to control the brake, and if not, the default control parameters are adopted to control the brake. The group information of the control parameter may be a group number of the control parameter or control mode information of the brake, and the like, and the control mode of the brake may represent a control mode of the brake and/or the group information of the control parameter in a certain control mode, and the like.

For example, different control modes may be set for the brake in advance, and a set of corresponding control parameters may be set for each control mode. In this case, the different control modes can represent different control modes, such as constant voltage control or constant current control. In order to reduce the difficulty of controlling the brake, when the brake is a high-impedance brake, the brake is preferably controlled by adopting a constant-voltage control and constant-current control mode; when the brake is a low-impedance brake, the brake is preferably controlled in a constant-current mode. The resistance ranges of the high impedance and the low impedance may be set as required, for example, the brake with the resistance greater than or equal to 15 Ω may be determined as a high impedance brake, and the brake with the resistance less than 15 Ω may be determined as a low impedance brake, and the like, which is not limited in this embodiment.

It should be noted that, although this embodiment is described by taking an example in which the control system carries the control mode information in the opening instruction and sends the control mode information to the control device, this embodiment may also send the opening instruction and the control mode information to the control device respectively, for example, send the opening instruction and the mode selection instruction carrying the control mode information used this time to the control device respectively, at this time, the control device may determine the control mode information used in this time of control according to the received mode selection instruction, and search for the control parameter used in this time of control according to the control mode information.

S320, controlling a converter to input a first electric signal to the brake through a first control module so that the brake enters a strong excitation stage, wherein the current intensity of the first electric signal is consistent with a first theoretical current intensity of the brake in the strong excitation stage, wherein the first theoretical current intensity is contained in the control parameters.

In this embodiment, the control device may directly control the converter; the inverter may be controlled by a PWM control circuit in the band-type brake power supply, in this case, the control device may generate and transmit a first control command for controlling the inverter to generate the first electric signal to the PWM control circuit, the PWM control circuit may receive the first control command transmitted by the control device, generate a pulse (i.e., a first output command) having a corresponding pulse width and intensity according to the first control command, and transmit the pulse to the inverter, and the inverter may input the first electric signal to the brake based on the pulse.

S330, acquiring first detection current intensity of the first electric signal, and executing S340 or S350.

S340, if the first detected current intensity is larger than the maximum current threshold value of the strong excitation stage, adjusting the brake to be in a closing state according to a preset rule of the strong excitation stage, and ending the operation

The preset rule of the strong magnetic stage can be that the elevator is immediately stopped, for example, a blocking instruction is sent to a blocking output circuit to instruct the blocking output circuit to block the output of the converter.

S350, if the detected current intensity is smaller than the maximum current threshold value in the strong excitation stage, controlling the converter to input a second electric signal to the brake through a first control module when the input duration of the first electric signal reaches a first set duration, so that the brake enters the weak excitation stage, wherein the current intensity of the second electric signal is consistent with a second theoretical current intensity of the brake in the weak excitation stage, which is contained in the control parameters, and the first theoretical current intensity is larger than the second theoretical current intensity.

In this embodiment, the first electrical signal is used to switch the brake from on to off, i.e. the brake performs an opening action; the second electrical signal is used to maintain the brake in an open state, i.e., in an unbraked state. The first set time length can be determined according to the time spent on switching the brake from on to off, and can be generally set to be equal to or slightly more than the time spent on switching the brake from on to off, so that the loss of the brake coil caused by the overlarge current for a long time can be reduced on the premise of ensuring that the brake can be switched to off. For example, when the brake is opened quickly and the time for switching to open is short, the first set time period may be set to a small time period such as 0.3s, 0.5s, etc.; when the brake is opened slowly and the time for switching to open is long, the first set time length can be set to be 1s, 1.1s and other long time lengths.

For example, if the control device controls the converter through the PWM control circuit in the band-type brake power supply, when the input duration of the first electric signal reaches the first set duration, the control device may generate and send a second control instruction to the PWM control circuit to control the converter to generate the second electric signal; the PWM control circuit receives a second control command transmitted from the control device, generates a pulse having a corresponding pulse width and intensity (i.e., a second output command) in accordance with the second control command, and transmits the pulse to the inverter, which inputs a second electric signal to the brake based on the pulse.

And S360, acquiring second detection current intensity of the second electric signal, and executing S370 or S380.

And S370, if the second detected current intensity is out of the normal threshold range of the current of the brake weak excitation stage, adjusting the brake to be in a closing state according to a preset rule of the weak excitation stage, and ending the operation.

The preset rule of the weak excitation stage can be that the elevator is stopped nearby, for example, according to the current position of the elevator and the running direction of the elevator, a target floor which is closest to the current position in the running direction is determined, and when the elevator runs to the target floor, a blocking instruction is sent to a blocking output circuit to instruct the blocking output circuit to block the output of the converter.

And S380, if the second detected current intensity is within the normal threshold range of the brake weak excitation stage current, sending a starting instruction to a weak excitation protection circuit through a second control module when the input duration of the second electric signal reaches a second set duration to start the weak excitation protection circuit, wherein the weak excitation protection circuit is used for sending an alarm message to an elevator main control system when the detected current intensity is outside the normal threshold range of the brake weak excitation stage current.

In this embodiment, a weak excitation protection circuit may be provided in the band-type brake power supply, so as to monitor the current intensity of the brake at the weak excitation stage through the weak excitation protection circuit and the control device, thereby improving the safety of the elevator. At this time, the control device can control the weak excitation protection circuit to be started after the second electric signal input duration reaches a second set duration, so as to ensure that the current input to the brake by the converter is reduced from the first theoretical current intensity to the normal threshold range of the current in the weak excitation stage, and avoid the condition of false alarm of the weak excitation protection circuit. In addition, the second control module different from the first control module is used for controlling the opening of the weak excitation protection circuit, namely the strong and weak excitation switching and the weak excitation protection circuit switch are controlled by different control modules in a control device (such as a processor), even if the first control module fails to cause the normal switching of strong and weak excitation, the opening of the weak excitation protection circuit cannot be influenced, and the weak excitation protection circuit detects that the strong excitation stage is not normally switched to the weak excitation stage after being opened, namely the detected current intensity of the electric signal is not normally reduced to the normal range of the weak excitation stage from the current intensity of the strong excitation stage, the elevator can be controlled to be nearly stopped by an elevator main control system, so that the common cause failure risk of the control device is reduced, and the safety coefficient of the elevator is further improved.

The second set time period may be determined according to a time consumed by the brake coil current to switch from the strong excitation stage to the weak excitation stage, for example, a time consumed by the brake coil current to decrease from the first theoretical current intensity to within a normal threshold range of the brake coil current in the weak excitation stage.

And S390, when an elevator near stopping instruction sent by an elevator main control system based on the alarm message is received through the elevator near stopping module, determining a target floor which is closest to the current position in the running direction according to the current position of the elevator and the running direction of the elevator, and sending a blocking instruction to a blocking output circuit to instruct the blocking output circuit to block the output of the converter when the elevator runs to the target floor.

According to the control method of the elevator brake provided by the third embodiment of the invention, the switching of the strong and weak excitation and the switching of the weak excitation protection circuit are controlled through different control modules of the control device, and the brake is controlled through the weak excitation protection circuit and the control device, so that the common cause failure risk of the control device can be reduced, and the safety coefficient of the elevator and the service life of the brake are further improved.

Example four

The fourth embodiment of the invention provides a preferable control method of the elevator brake. The method can be carried out by a control device of the elevator brake, wherein the device can be implemented by software and/or hardware and can be integrated into the elevator brake power supply in general. Fig. 5A is a schematic flow chart of a preferred elevator brake control method according to a fourth embodiment of the present invention, as shown in fig. 5A, the method includes:

s401, receiving an EN opening instruction and a mode selection instruction.

Wherein, the EN opening instruction is an opening instruction. The elevator master control system can only send a mode selection instruction when the elevator is powered on, and can also send the mode selection instruction when the elevator is started every time.

S402, returning a receiving message to the elevator master control system, and determining a control parameter according to the mode selection instruction.

The receiving message is used for informing the main control system that the local end receives the EN opening instruction.

S403, the converter is turned on, and the converter enters a standby state.

And S404, controlling the converter to output a first electric signal in a strong excitation stage so as to enable the brake to enter the strong excitation stage.

S405, judging whether the duration time of the strong excitation stage is greater than or equal to T1, if so, executing S408; if not, go to step S406.

Where T1 is the first set duration.

S406, judging whether I1 is greater than Imax1, if so, returning to S405; if yes, go to S407.

Wherein, I1 is the first detection current intensity, and Imax1 is the first theoretical current intensity.

And S407, blocking the output of the converter to switch on the brake, and ending the operation.

And S408, controlling the converter to output a second electric signal in the weak excitation stage so as to enable the brake to enter the weak excitation stage.

And S409, after a time delay of T2, the weak excitation protection circuit is started.

Where T2 is the second set duration.

S410, judging whether Imin2 is more than or equal to I2 and more than or equal to Imax2, if yes, returning to execute S410; if yes, go to S411.

Wherein I2 is the second detected current intensity, ini 2 is the minimum value of the normal threshold range, and Imax2 is the maximum value of the normal threshold range.

S411, controlling the elevator to stop nearby, and feeding back weak exciting current warning fault notification to an elevator main control system.

A timing chart of controlling the brake by adopting the method is shown in fig. 5B, wherein EN _ FB is a feedback signal sent by the band-type brake power supply to the elevator main control system, such as a receiving notification and a weak exciting current warning fault notification of the band-type brake power supply to the elevator main control system, by taking EN low level effective as an example; t3 and T4 characterize the length of time that EN _ FB is delayed with respect to EN, and may or may not be equal.

The preferable control method of the elevator brake provided by the fourth embodiment of the invention can improve the control precision of the brake, reduce the loss of the brake and prolong the service life of the brake on the premise of ensuring the safe operation of the elevator.

EXAMPLE five

The fifth embodiment of the invention provides a control device of an elevator brake. The device can be realized by software and/or hardware, can be generally integrated in an elevator band-type brake power supply, and can control the elevator brake by executing the control method of the elevator brake. Fig. 6 is a block diagram showing a structure of a control device of an elevator brake according to a fifth embodiment of the present invention, and as shown in fig. 6, the device includes:

the signal strength acquisition module 501 is configured to acquire the signal strength of an electrical signal input to a brake by a converter in the brake opening process of an elevator brake, where the converter is an ac/dc converter and is connected in series between the brake and an ac power supply, and the brake opening process includes a strong excitation stage and a weak excitation stage;

a state adjusting module 502, configured to adjust the brake to a closing state according to a preset rule when the signal strength is outside a normal signal strength range of the brake at the current stage.

According to the control device of the elevator brake provided by the fifth embodiment of the invention, the signal intensity of the electric signal input to the brake by the converter is obtained by the signal intensity obtaining module in the brake opening process of the elevator brake, and the brake is adjusted to be in the closing state by the state adjusting module when the signal intensity is out of the normal signal intensity range of the brake at the current stage. This embodiment is through adopting above-mentioned technical scheme, and when signal strength was located outside the normal signal strength scope, closing the stopper, can improve the factor of safety of elevator and the life of elevator stopper, reduces the loss of stopper, prolongs the life of stopper, reduces the cost of maintenance of stopper.

In the above scheme, the signal strength obtaining module 501 may be configured to: and determining the control mode of the brake at the current stage, and acquiring the signal intensity of the electric signal input to the brake by the converter according to the control mode.

In the above scheme, the control mode may be constant current control, and the signal strength may be a detection current strength.

In the above solution, the state adjustment module 502 may include: the strong excitation adjusting unit is used for sending a blocking instruction to a blocking output circuit to indicate the blocking output circuit to block the output of the converter when the current stage is a strong excitation stage and the detected current intensity is greater than the maximum current threshold value of the brake strong excitation stage; and/or the weak excitation adjusting unit is used for determining a target floor which is closest to the current position in the running direction according to the current position of the elevator and the running direction of the elevator when the current stage is the weak excitation stage and the detected current intensity is out of the normal threshold range of the current in the brake weak excitation stage, and sending a blocking instruction to a blocking output circuit to instruct the blocking output circuit to block the output of the converter when the elevator runs to the target floor.

Further, the control device of the elevator brake may further include: the parameter acquisition module is used for acquiring control parameters of a brake of the elevator when receiving a brake opening instruction sent by an elevator main control system; the first control module is used for controlling the converter to input a first electric signal to the brake so that the brake enters a strong excitation stage, and controlling the converter to input a second electric signal to the brake so that the brake enters a weak excitation stage when the input duration of the first electric signal reaches a first set duration, wherein the current intensity of the first electric signal is consistent with a first theoretical current intensity of the brake in the strong excitation stage contained in the control parameter, the current intensity of the second electric signal is consistent with a second theoretical current intensity of the brake in the weak excitation stage contained in the control parameter, and the first theoretical current intensity is greater than the second theoretical current intensity.

Further, the control device of the elevator brake may further include a second control module, configured to send a start instruction to a weak excitation protection circuit to start the weak excitation protection circuit when an input duration of the second electrical signal reaches a second set duration, where the weak excitation protection circuit is configured to send an alarm message to an elevator main control system when the detected current intensity is outside a normal threshold range of the current in the weak excitation phase of the brake; and the nearby elevator stopping module is used for determining a target floor which is closest to the current position in the running direction according to the current position of the elevator and the running direction of the elevator when receiving an nearby elevator stopping instruction sent by an elevator main control system based on the alarm message, and sending a blocking instruction to a blocking output circuit to instruct the blocking output circuit to block the output of the converter when the elevator runs to the target floor.

Further, the control device of the elevator brake may further include: and the fault warning module is used for generating a fault warning message after the brake is adjusted to be in a closing state according to the set rule and feeding the fault warning message back to the elevator main control system.

The control device of the elevator brake provided by the fifth embodiment of the invention can execute the control method of the elevator brake provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the control method of the elevator brake. The details of the elevator brake, which are not described in detail in the present embodiment, can be referred to the control method of the elevator brake provided in any embodiment of the present invention.

EXAMPLE six

Fig. 7 is a schematic structural diagram of an elevator brake power supply according to a sixth embodiment of the present invention, as shown in fig. 7, the elevator brake power supply includes a processor 60, a memory 61, and an inverter 62 connected in series between an elevator brake 10 and an ac power source 20, and may further include an input device 63 connected to the processor 60, a freewheeling circuit 40 connected in parallel with the brake 10, a load resistor 50 connected in series between the brake 10 and the inverter 62, a first contactor KM1, and a second contactor KM 2; the number of the processors 60 in the band-type brake power supply may be one or more, and in fig. 7, one processor 60 is taken as an example, and the processor may be a Microcontroller Unit (MCU).

The memory 61 is a computer-readable storage medium for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the control method of the elevator brake power supply in the embodiment of the present invention (e.g., the signal strength acquisition module 501 and the status adjustment module 502 in the control device of the elevator brake power supply). The processor 60 executes various functional applications and data processing of the band-type brake power supply by running software programs, instructions and modules stored in the memory 61, so as to realize the control method of the elevator brake power supply.

The memory 61 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 61 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 61 may further include a memory remotely located from the processor 60, and these remote memories may be connected to the brake power supply via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Further, the input device 63 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the band-type brake power supply. The freewheel circuit 40 can be used to form a closed loop with the coil of the brake 10 at the instant when the brake 10 is de-energized, to suppress the rise in the self-inductance voltage of the coil. The contactor KM1 and the contactor KM2 can be opened based on the control of a contactor control circuit (not shown) when the current in the circuit is excessive, so as to prevent the brake 10 from being damaged by the excessive current.

Further, the band-type brake power supply can also include: a current sense circuit 64, a PWM control circuit 65, a lockout output circuit 66, and a control and feedback interface circuit 67, wherein,

the current detection circuit 64 is respectively connected with the processor 60 and a load resistor R connected in series between the converter 62 and the brake 10, and is configured to detect a detected current intensity of an electric signal input to the brake 10 by the converter 62 and send the detected current intensity to the processor 60;

the processor 60 is connected to the control and feedback interface circuit 67 and the lockout output circuit 66, and is configured to receive the detection signal strength, send a lockout instruction to the lockout circuit when the current stage is a strong excitation stage and the detection current strength exceeds a maximum current threshold of the brake 10 in the strong excitation stage, or determine a target floor closest to the current position of the elevator in the current operation direction when the current stage is a weak excitation stage and the detection current strength is outside a normal threshold range of the current in the weak excitation stage of the brake 10, and send a lockout instruction to the lockout output circuit 66 when the elevator is operated to the target floor, generate a fault alarm message, and send the fault alarm message to the control and feedback interface circuit 67; after receiving the switching-off command forwarded by the control and feedback interface circuit 67, generating a control command for controlling the PWM control circuit 65, and sending the control command to the lockout output circuit 66;

the lockout output circuit 66 is connected to the PWM control circuit 65, and is configured to send an output stop instruction to the PWM control circuit 65 when receiving the lockout instruction; and, when receiving the control instruction, forwarding the control instruction to the PWM control circuit 65;

the PWM control circuit 65 is connected to the converter 62, and configured to send an output instruction to the converter 62 to control the converter 62 to output an electrical signal when receiving the control instruction; and, when receiving the lockout command, stopping sending the output command to control the converter 62 to stop outputting electrical signals;

the control and feedback interface circuit 67 is connected to the elevator master control system 30, and is configured to receive the fault warning message sent by the processor 60, and send the fault warning message to the elevator master control system 30; and receives the opening command sent by the elevator master control system 30, and forwards the opening command to the processor 60.

The PWM control circuit 65 may be powered by the ac power supply 20; and may also be powered by an auxiliary power supply 50, and when powered by the auxiliary power supply 50, as shown in fig. 7, the band-type brake power supply may preferably further include an auxiliary power supply 50 connected to the PWM control circuit 65 for powering the PWM control circuit 65.

Illustratively, the control process for opening the brake 10 is as follows: the elevator master control system 30 generates an opening command and sends the opening command to the control and feedback interface circuit 67; the control and feedback interface circuit 67 receives the switching-off command sent by the elevator master control system 30 and forwards the switching-off command to the processor 60; after receiving the switching-off command forwarded by the control and feedback interface circuit 67, the processor 60 generates a control command for controlling the PWM control circuit 65, and sends the control command to the lockout output circuit 66; the lockout output circuit 66 receives the control command sent by the processor 60 and forwards the control command to the PWM control circuit 65; when receiving the control command forwarded by the lock-out output circuit 66, the PWM control circuit 65 generates an output command based on the control command and sends the output command to the converter 62; inverter 62 inputs an electric signal to brake 10 based on a control command sent from PWM control circuit 65. Specifically, the processor 60 may generate and send a first control instruction to the lockout output circuit 66 to enable the PWM control circuit 65 to control the converter 62 to generate the first electric signal so as to enable the brake 10 to enter the strong excitation phase when receiving the opening instruction, and generate and send a second control instruction to the lockout output circuit 66 to enable the PWM control circuit 65 to control the converter 62 to generate the second electric signal so as to enable the brake 10 to be switched from the strong excitation phase to the weak excitation phase after the set time length.

It should be noted that, although the present embodiment is described by taking the processor 60 as an example of forwarding the control command to the PWM control circuit 65 through the lockout output circuit 66, it should be understood by those skilled in the art that the present embodiment may also directly establish a connection between the PWM control circuit 65 and the processor 60, in this case, the processor 60 may directly send the generated control command to the PWM control circuit 65 after generating the control command, but whatever sending method is included in the protection scope of the present invention.

For example, the process of monitoring the current input to the brake 10 by the processor 60 may be: the current detection circuit 64 detects the current intensity of the electric signal input to the brake 10 by the inverter 62 and sends the current intensity to the processor 60; after receiving the current intensity sent by the current detection circuit 64, the processor 60 determines whether the current intensity is lower than the maximum current threshold of the current stage (for the case that the current stage of the brake 10 is the strong excitation stage) or whether the current intensity is within the normal threshold range of the current stage (for the case that the current stage of the brake 10 is the weak excitation stage) according to the current stage (the strong excitation stage or the weak excitation stage) of the brake 10, if so, determines whether the current intensity matches the theoretical current intensity corresponding to the current stage, if so, sends a maintaining instruction for instructing the PWM control circuit 65 to control the converter 62 according to the current pulse width and intensity to the blocking output circuit 66, and if not, sends an adjusting instruction for instructing the PWM control circuit 65 to correspondingly increase or decrease the width and/or intensity of the output pulse to the blocking output circuit 66, and returns to the operation of executing the current intensity sent by the above-mentioned receiving current detection circuit 64 and judging whether it is lower than the maximum current threshold or within the normal threshold range until the current intensity detected by the current detection circuit 64 is in accordance with the theoretical current intensity; if not, generating a blocking instruction (aiming at the condition that the brake 10 is in the strong excitation stage) according to the current stage of the brake 10 or generating a blocking instruction (aiming at the condition that the brake 10 is in the weak excitation stage) when the elevator runs to the floor nearest to the current position of the elevator in the current running direction, and sending the generated blocking instruction to a blocking output circuit 66; the lockout output circuit 66 sends the maintenance instruction or the adjustment instruction to the PWM control circuit 65 when receiving the maintenance instruction or the adjustment instruction, and sends the output stop instruction to the PWM control circuit 65 when receiving the lockout instruction; the PWM control circuit 65 continues to control the converter 62 to output the electric signal in accordance with the current pulse when receiving the maintenance command forwarded by the lockout output circuit 66, adjusts the pulse output by itself in accordance with the adjustment command when receiving the adjustment command forwarded by the lockout output circuit 66, controls the converter 62 to output the electric signal using the adjusted pulse, and stops inputting the pulse to the converter 62 to stop the converter 62 from outputting the electric signal when receiving the output stop command transmitted by the lockout output circuit 66.

Further, the band-type brake power supply may further include a strong excitation protection circuit 68, where the strong excitation protection circuit 68 is respectively connected to the current detection circuit 64 and the lockout output circuit 66, and is configured to obtain a detected current intensity detected by the current detection circuit 64, and send a lockout instruction to the lockout output circuit 66 when the detected current intensity exceeds a maximum current threshold value of the brake 10 in the strong excitation stage, so as to instruct the lockout output circuit 66 to lockout the output of the converter 62 by sending a stop output instruction to the PWM control circuit 65.

For example, the current detection circuit 64 detects the detected current intensity of the electric signal input to the brake 10 by the converter 62 and sends the detected current intensity to the strong excitation protection circuit 68; the strong excitation protection circuit 68 receives the detected current intensity sent by the current detection circuit 64, judges whether the detected current intensity is greater than the maximum current threshold value in the strong excitation stage, if so, generates a blocking instruction, and sends the blocking instruction to the blocking output circuit 66, correspondingly, after receiving the blocking instruction sent by the strong excitation protection circuit 68, the blocking output circuit 66 sends an output stopping instruction to the PWM control circuit 65, and when receiving the output stopping instruction sent by the blocking output circuit 66, the PWM control circuit 65 stops inputting pulses to the converter 62, so that the converter 62 stops outputting electric signals; if not, the operation of returning to the detection current intensity sent by the received current detection circuit 64 and judging whether the detected current intensity is larger than the maximum current threshold value in the strong excitation stage is carried out until the converter 62 stops inputting the electric signal to the brake 10.

In addition, after sending the blocking output command to the blocking output circuit 68, the strong excitation protection circuit 68 may also feed back the current fault information to the elevator main control system 30, such as generating a fault warning message, and send the fault warning message to the elevator main control system 30 through the control and feedback interface circuit 67, at this time, preferably, the strong excitation protection circuit 68 may also be connected to the control and feedback interface circuit 67.

Further, the band-type brake power supply may further include a weak excitation protection circuit 69, where the weak excitation protection circuit 69 is respectively connected to the current detection circuit 64, the processor 60, and the control and feedback interface circuit 67, and is configured to obtain a detected current strength detected by the current detection circuit 64, generate a fault warning message when the detected current strength is outside a normal threshold range of the current in the weak excitation stage of the brake 10, and send the fault warning message to the elevator main control system 30 through the control and feedback interface circuit 67; correspondingly, the processor 60 is further configured to, upon receiving an approaching stop command generated by the elevator main control system 30 forwarded by the control and feedback interface circuit 67 based on the fault warning message, determine a target floor closest to the current position in the operation direction according to the current position of the elevator and the operation direction of the elevator, and send a first blocking command to the blocking output circuit 66 to instruct the blocking output circuit 66 to block the output of the converter 62 when the elevator operates to the target floor.

The maximum current threshold value of the brake 10 in the strong excitation phase is preferably greater than the maximum current intensity in the normal threshold value range of the current in the weak excitation phase of the brake 10.

For example, the current detection circuit 64 detects the intensity of the detected current input by the converter 62 to the brake 10 and sends the detected current to the field weakening protection circuit 69; after receiving the detection circuit strength sent by the current detection circuit 64, the weak excitation protection circuit 69 determines whether the detection current strength is within the normal threshold range of the current in the weak excitation stage of the brake 10, and if so, returns the current strength sent by the current detection circuit 64 and determines whether the current strength is within the normal threshold range until the weak excitation protection circuit turns off itself or the converter 62 stops inputting the electric signal to the brake 10; if not, generating a fault alarm message, and sending the fault alarm message to the control and feedback interface circuit 67; correspondingly, the control and feedback interface circuit 67 forwards the received fault warning message to the elevator master control system 30; after receiving the fault alarm message forwarded by the control and feedback interface circuit 67, the elevator master control system 30 generates an nearby elevator stopping instruction and sends the nearby elevator stopping instruction to the control and feedback interface circuit 67; the control and feedback interface circuit 67 forwards the received nearby elevator stopping instruction to the processor 60; after receiving the nearby elevator stopping instruction forwarded by the control and feedback interface circuit 67, the processor 60 determines a target floor closest to the current position in the running direction according to the current position of the elevator and the running direction of the elevator, and sends a first blocking instruction to the blocking output circuit 66 when the elevator runs to the target floor; the lockout output circuit 66 transmits an output stop command to the PWM control circuit 65 after receiving the first lockout command transmitted from the processor 60, and the PWM control circuit 65 stops inputting pulses to the inverter 62 to stop the inverter 62 from outputting electric signals when receiving the output stop command transmitted from the lockout output circuit 66.

An embodiment of the present invention also provides a storage medium containing computer-executable instructions which, when executed by a computer processor, perform a method of controlling an elevator brake power supply, the method comprising:

in the brake opening process of an elevator brake, acquiring the signal intensity of an electric signal input to the brake by a converter, wherein the converter is an alternating current/direct current converter and is connected in series between the brake and an alternating current power supply, and the brake opening process comprises a strong excitation stage and a weak excitation stage;

and if the signal intensity is out of the normal signal intensity range of the brake at the current stage, adjusting the brake to be in a closing state according to a preset rule.

Of course, the embodiment of the present invention provides a storage medium containing computer-executable instructions, and the computer-executable instructions are not limited to the operations of the method described above, and can also execute the related operations in the control method of the elevator brake power supply provided by any embodiment of the present invention.

From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.

It should be noted that, in the embodiment of the control device of the elevator brake power supply, the units and modules included in the control device are only divided according to the function logic, but are not limited to the above division as long as the corresponding functions can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (8)

1. A method of controlling an elevator brake, comprising:

in the process of opening a brake of an elevator brake, determining a control mode of the brake at the current stage, and acquiring the signal intensity of an electric signal input to the brake by a converter according to the control mode, wherein the converter is an alternating current/direct current converter and is connected in series between the brake and an alternating current power supply, and the process of opening the brake comprises a strong excitation stage and a weak excitation stage;

if the signal intensity is out of the normal signal intensity range of the brake at the current stage, adjusting the brake to be in a closing state according to a preset rule;

the control mode is constant current control, the signal intensity is detection current intensity, and if the signal intensity is out of the normal signal intensity range of the brake at the current stage, the brake is adjusted to be in a closing state according to a set rule, including:

if the current stage is a strong excitation stage and the detected current intensity is greater than the maximum current threshold value of the brake strong excitation stage, sending a blocking instruction to a blocking output circuit to instruct the blocking output circuit to block the output of the converter;

if the current stage is a weak excitation stage and the detected current intensity is out of the normal threshold range of the brake weak excitation stage current, determining a target floor which is closest to the current position in the running direction according to the current position of the elevator and the running direction of the elevator, and sending a blocking instruction to a blocking output circuit to instruct the blocking output circuit to block the output of the converter when the elevator runs to the target floor.

2. The method of claim 1, further comprising:

when a brake opening command sent by an elevator master control system is received, acquiring control parameters of a brake of the elevator;

controlling a converter to input a first electric signal to the brake through a first control module so as to enable the brake to enter a strong excitation stage, wherein the current intensity of the first electric signal is consistent with a first theoretical current intensity of the brake in the strong excitation stage, wherein the first theoretical current intensity is contained in the control parameters;

and controlling the converter to input a second electric signal to the brake through a first control module when the input duration of the first electric signal reaches a first set duration, so that the brake enters a weak excitation stage, wherein the current intensity of the second electric signal is consistent with a second theoretical current intensity of the brake in the weak excitation stage, which is included in the control parameters, and the first theoretical current intensity is greater than the second theoretical current intensity.

3. The method of claim 2, after the controlling the converter to input a second electrical signal to the brake to cause the brake to enter a field weakening stage, further comprising:

when the input duration of the second electric signal reaches a second set duration, a second control module sends a starting instruction to a weak excitation protection circuit to start the weak excitation protection circuit, wherein the weak excitation protection circuit is used for sending an alarm message to an elevator main control system when the detected current intensity is out of a normal threshold range of the brake weak excitation stage current;

when an elevator close stopping instruction sent by an elevator main control system based on the alarm message is received through an elevator close stopping module, a target floor which is closest to the current position in the running direction is determined according to the current position of the elevator and the running direction of the elevator, and when the elevator runs to the target floor, a blocking instruction is sent to a blocking output circuit to indicate the blocking output circuit to block the output of the converter.

4. The method of claim 1, further comprising, after the adjusting the brake to a closed state according to a set rule:

and generating a fault warning message and feeding the fault warning message back to an elevator master control system.

5. A control device for an elevator brake, comprising:

the signal intensity acquisition module is used for determining a control mode of the brake at the current stage in the brake opening process of the elevator brake and acquiring the signal intensity of an electric signal input to the brake by a converter according to the control mode, wherein the converter is an alternating current/direct current converter and is connected in series between the brake and an alternating current power supply, and the brake opening process comprises a strong excitation stage and a weak excitation stage;

the state adjusting module is used for adjusting the brake to be in a closing state according to a preset rule when the signal intensity is out of the normal signal intensity range of the brake at the current stage;

wherein, the control mode is constant current control, signal intensity is detection current intensity, state adjustment module includes:

the strong excitation adjusting unit is used for sending a blocking instruction to a blocking output circuit to indicate the blocking output circuit to block the output of the converter when the current stage is a strong excitation stage and the detected current intensity is greater than the maximum current threshold value of the brake strong excitation stage;

and the weak excitation adjusting unit is used for determining a target floor which is closest to the current position in the running direction according to the current position of the elevator and the running direction of the elevator when the current stage is a weak excitation stage and the detected current intensity is out of the normal threshold range of the current in the brake weak excitation stage, and sending a blocking instruction to a blocking output circuit to instruct the blocking output circuit to block the output of the converter when the elevator runs to the target floor.

6. An elevator band-type brake power supply is characterized by comprising a converter connected between an elevator brake and an alternating current power supply in series, and further comprising:

one or more processors;

a memory for storing one or more programs,

when executed by the one or more processors, cause the one or more processors to implement the method of controlling an elevator brake of any of claims 1-4.

7. The band-type brake power supply according to claim 6, further comprising: a current detection circuit, a PWM control circuit, a blocking output circuit, a control and feedback interface circuit, a strong excitation protection circuit and a weak excitation protection circuit,

the current detection circuit is respectively connected with the processor, the load resistor connected between the converter and the brake in series, the strong excitation protection circuit and the weak excitation protection circuit; the PWM control circuit is respectively connected with the converter and the blocking output circuit; the blocking output circuit is respectively connected with the processor and the strong excitation protection circuit; the control and feedback interface circuit is respectively connected with the processor and the weak excitation protection circuit; the weak excitation protection circuit is connected with the processor;

the current detection circuit is used for detecting the detection current intensity of the electric signal input to the brake by the converter;

the strong excitation protection circuit is used for acquiring the detected current intensity, and sending a blocking instruction to the blocking output circuit when the detected current intensity exceeds the maximum current threshold value of the brake strong excitation stage so as to instruct the blocking output circuit to block the output of the converter by sending a stop output instruction to the PWM control circuit;

the weak excitation protection circuit is used for acquiring the detection current intensity after being started based on a starting instruction sent by the processor, generating an alarm message when the detection current intensity is out of the normal threshold range of the current in the weak excitation stage of the brake, and sending the alarm message to an elevator main control system through the control and feedback interface circuit;

correspondingly, the processor is further configured to, when an elevator main control system forwarded by the control and feedback interface circuit receives an approaching elevator stopping instruction generated based on the alarm message, determine a target floor closest to the current position in the operation direction according to the current position of the elevator and the operation direction of the elevator, and send a blocking instruction to a blocking output circuit to instruct the blocking output circuit to block the output of the converter by sending a stopping output instruction to the PWM control circuit when the elevator operates to the target floor.

8. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, carries out the control method of an elevator brake according to any one of claims 1-4.

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