Elevator safety gear driving circuit, method, driver and system

Abstract

The invention provides an elevator safety tongs driving circuit, method, driver and system, the elevator safety tongs driving circuit comprises a power supply circuit, a detection and diagnosis circuit, a first sampling circuit, a second sampling circuit, a driving control circuit and an overcurrent detection circuit, and the driving control circuit comprises a driving signal generation circuit, a high-side switch and a low-side switch; the first sampling circuit monitors the power supply voltage and the first working voltage; the second sampling circuit monitors a switch loop of an electromagnet of the elevator safety tongs; the overcurrent detection circuit monitors the current of an electromagnet of the elevator safety tongs; the detection and diagnosis circuit outputs PWM diagnosis signals regularly, and judges the condition of the elevator safety tongs according to the monitoring results of the first sampling circuit, the second sampling circuit and the over-current detection circuit; the drive signal generating circuit outputs a drive signal so that the high-side switch and the low-side switch control their switching states based on the drive signal. Faults of the safety tongs and the driver can be found in time, and effective braking of the safety tongs is improved.

Description

Technical Field

[0001] The present application relates to the technical field of elevator equipment, and in particular to an elevator safety clamp driving circuit, method, driver and system. Background Art

[0002] The safety clamp is a safety protection device for elevators. When the elevator speed exceeds the speed limit set by the elevator speed limiter, or the suspension rope breaks or loosens, the elevator car is stopped and clamped on the track. That is, as an emergency brake device for the elevator, the safety clamp can respond quickly and lock the guide rails when the elevator is running abnormally or in danger, so that the elevator can be instantly frozen in a safe position. Therefore, the safety clamp provides effective protection for the safe operation of the elevator.

[0003] The traditional elevator safety protection device is a speed limiter + safety clamp. This device is a semi-automatic device. The speed limiter and safety clamp can provide passive protection for the elevator, but the device occupies a large space. The electronic safety clamp overcomes the shortcomings of the traditional elevator safety protection device and has been widely used. Usually, the electronic safety clamp needs to be used in conjunction with the driver. When the driver receives the signal that triggers the safety clamp to act, it controls the safety clamp to act.

[0004] When the electronic components inside the driver fail, the safety clamp will not work, resulting in the failure of the safety clamp function. When the elevator is running abnormally or in danger, if the driver fails and the safety clamp function fails, the elevator cannot brake, which will have immeasurable consequences. Therefore, how to detect the failure of the safety clamp in time and how to improve the effective braking of the electronic safety clamp when the driver fails have become important issues that need to be solved. Summary of the invention

[0005] The present application provides an elevator safety clamp driving circuit, method, driver and system to timely detect the failure of the electronic safety clamp and the driver, and improve the effective braking of the electronic safety clamp. The specific technical solution is as follows:

[0006] In a first aspect, the present application provides an elevator safety clamp drive circuit, the circuit comprising: a power supply circuit, a detection and diagnosis circuit, a first sampling circuit, a second sampling circuit, a drive control circuit and an overcurrent detection circuit, wherein the drive control circuit comprises a drive signal generating circuit, a high-side switch and a low-side switch;

[0007] The power supply circuit is electrically connected to the first sampling circuit, the detection and diagnosis circuit is electrically connected to the first sampling circuit, the second sampling circuit, the drive control circuit and the overcurrent detection circuit respectively; the overcurrent detection circuit is electrically connected to the drive signal generating circuit; the output end of the drive signal generating circuit is electrically connected to the control end of the high side switch and the control end of the low side switch respectively; the first end of the high side switch is electrically connected to the positive pole of the first working voltage, and the second end of the high side switch is electrically connected to the positive pole of the electromagnet of the elevator safety clamp; the first end of the low side switch is electrically connected to the negative pole of the first working voltage, and the second end of the low side switch is electrically connected to the negative pole of the electromagnet of the elevator safety clamp;

[0008] The power supply circuit is used to receive a power supply voltage, convert the power supply voltage, and output the first working voltage;

[0009] The first sampling circuit is used to collect the power supply voltage and the first working voltage to obtain a power supply sampling signal;

[0010] The second sampling circuit is used to collect the voltage between the positive electrode and the negative electrode of the electromagnet of the elevator safety clamp to obtain a loop voltage signal;

[0011] The overcurrent detection circuit is used to monitor the current of the electromagnet of the elevator safety clamp, and obtain a circuit overcurrent signal when the current of the electromagnet of the elevator safety clamp is greater than a preset current threshold;

[0012] The detection and diagnosis circuit is used to regularly output a PWM diagnosis signal to the drive control circuit; it is also used to judge the condition of the elevator safety clamp according to the power sampling signal, the loop voltage signal and the loop overcurrent signal, and output a fault signal when judging that the elevator safety clamp is faulty;

[0013] The drive signal generating circuit is used to receive and output a drive signal according to a trigger signal, the loop overcurrent signal and the PWM diagnostic signal, so that the high-side switch and the low-side switch control their own switching states based on the drive signal.

[0014] In one possible design, the power supply circuit includes: a first voltage stabilizing circuit, a charging circuit, a supercapacitor circuit, a balancing circuit, a first grid-connected circuit, a second voltage stabilizing circuit, and a third voltage stabilizing circuit;

[0015] The input end of the first voltage stabilizing circuit is connected to the supply voltage, the output end of the first voltage stabilizing circuit is electrically connected to the first input end of the charging circuit and the first grid-connected circuit respectively, the output end of the charging circuit is electrically connected to the first input end of the supercapacitor circuit, the output end of the balancing circuit is electrically connected to the second input end of the supercapacitor circuit, the output end of the supercapacitor circuit is electrically connected to the second input end of the first grid-connected circuit, and the output end of the first grid-connected circuit is electrically connected to the first sampling circuit, the second voltage stabilizing circuit and the third voltage stabilizing circuit respectively;

[0016] The first voltage stabilizing circuit is used to convert the supply voltage and output a first voltage;

[0017] The charging circuit is used to charge the supercapacitor circuit based on the first voltage;

[0018] The supercapacitor circuit is used to generate a first charging voltage;

[0019] The balancing circuit is used to balance the voltage of the capacitor of the supercapacitor circuit;

[0020] The first grid-connected circuit is used to combine the first voltage and the first charging voltage to obtain a first working voltage;

[0021] The second voltage stabilizing circuit is used to convert the first operating voltage to obtain a second voltage;

[0022] The third voltage stabilizing circuit is used to convert the first operating voltage to obtain a second operating voltage.

[0023] In a possible design, the drive control circuit further includes: an excitation switch, a delay circuit and a second grid-connected circuit;

[0024] The first input end of the drive signal generating circuit is used to access the trigger signal, the second input end of the drive signal generating circuit is used to access the PWM diagnostic signal, the third input end of the drive signal generating circuit is used to access the loop overcurrent signal, the fourth input end of the drive signal generating circuit is used to access the second working voltage, and the output end of the drive signal generating circuit is electrically connected to the first control end of the excitation switch; the first end of the excitation switch is connected to the supply voltage, the second end of the excitation switch is electrically connected to the first input end of the second grid-connected circuit, and the second control end of the excitation switch is electrically connected to the output end of the delay circuit; the second end of the high-side switch is electrically connected to the input end of the delay circuit and the second input end of the second grid-connected circuit respectively; the output end of the second grid-connected circuit is electrically connected to the positive pole of the electromagnet of the elevator safety clamp; the input end of the overcurrent detection circuit is electrically connected to the low-side switch;

[0025] The delay circuit is used to output a delay signal;

[0026] The excitation switch is used to output the supply voltage according to the drive signal so that the electromagnet of the elevator safety clamp is attracted; and is also used to control itself to stop outputting the supply voltage when receiving the delay signal so that the electromagnet of the elevator safety clamp continues to be attracted under the control of the first working voltage;

[0027] The second grid-connected circuit is used to combine the first working voltage and the power supply voltage to obtain a driving voltage to drive the elevator safety clamp.

[0028] In one possible design, the circuit further includes: a protection circuit;

[0029] The input end of the protection circuit is used to access the power supply input voltage, and the output end of the protection circuit is electrically connected to the input end of the power supply circuit;

[0030] The protection circuit is used to protect the power input voltage from reverse connection and surge, and output the power supply voltage.

[0031] In one possible design, the supercapacitor circuit includes a plurality of supercapacitors connected in series.

[0032] In a second aspect, the present application provides an elevator safety clamp driving method, the method comprising:

[0033] Monitoring the power supply voltage and the first working voltage to obtain a power supply sampling signal;

[0034] Monitoring the voltage between the positive and negative electrodes of the electromagnet of the elevator safety clamp to obtain a loop voltage signal;

[0035] The current of the electromagnet of the elevator safety clamp is monitored, and when the current of the electromagnet of the elevator safety clamp is greater than a preset current threshold, a circuit overcurrent signal is obtained;

[0036] Output PWM diagnostic signal regularly;

[0037] Outputting a fault signal according to the power sampling signal, the loop voltage signal and the loop overcurrent signal;

[0038] A driving signal is received and output according to the trigger signal, the loop overcurrent signal and the PWM diagnostic signal, so that the high-side switch and the low-side switch control their switching states based on the driving signal.

[0039] In one possible design, after receiving and outputting a drive signal according to the trigger signal, the loop overcurrent signal, and the PWM diagnostic signal so that the high-side switch and the low-side switch control their own switch states based on the drive signal, the method further includes:

[0040] Get the delayed signal;

[0041] According to the driving signal, outputting an excitation voltage to attract the electromagnet of the elevator safety clamp;

[0042] When the delay signal is received, the excitation voltage is no longer output, so that the electromagnet of the elevator safety clamp continues to be attracted under the control of the first working voltage.

[0043] In a third aspect, the present application provides a driver, comprising: the elevator safety clamp driving circuit as described in the first aspect.

[0044] In a fourth aspect, the present application provides an elevator safety clamp driving system, comprising: a trigger switch, an elevator safety clamp, an elevator controller, and the driver as described in the third aspect; the driver is electrically connected to the trigger switch, the elevator safety clamp, and the elevator controller, respectively;

[0045] The trigger switch is used to output a trigger signal;

[0046] The elevator controller is used to receive a fault signal.

[0047] In a fifth aspect, the present application provides an electronic device, including a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

[0048] Memory, used to store computer programs;

[0049] The processor is used to implement the steps of the elevator safety clamp driving method described in the second aspect when executing the program stored in the memory.

[0050] In a sixth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the elevator safety clamp driving method described in the second aspect are implemented.

[0051] Beneficial effects of the embodiments of the present application:

[0052] In the embodiment of the present application, through the redundant design of the high-side switch and the low-side switch, when one of the switches has a short-circuit fault, the other switch can still drive the elevator safety clamp to operate according to the driving signal, thereby improving the effective braking of the elevator safety clamp; in addition, the PWM diagnostic signal is outputted regularly through the detection and diagnosis circuit, and the key voltage, the electromagnet of the elevator safety clamp and the status of its switch circuit are monitored and diagnosed in real time based on the first sampling circuit, the second sampling circuit and the overcurrent detection circuit. When the electromagnet of the elevator safety clamp and its switch circuit fail, the key voltage is abnormal or the electromagnet has an overcurrent, a fault signal is output and the fault signal is reported to the elevator controller in time, so as to facilitate timely detection and processing of the fault.

[0053] The beneficial effects provided in the above-mentioned second aspect and various possible designs of the above-mentioned second aspect can refer to the beneficial effects brought about by the above-mentioned first aspect and various possible implementation methods of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0055] Figure 1 A schematic diagram of the structure of an elevator safety clamp driving circuit provided in an embodiment of the present application;

[0056] Figure 2 A working diagram of an elevator safety clamp driving system provided in an embodiment of the present application;

[0057] Figure 3 A schematic diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0058] In this application, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c alone can represent: a, b, c, a and b, a and c, or a, b, and c, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0059] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0060] The terms "connected" and "connected" should be understood in a broad sense. For example, the "connected" or "connected" of a circuit structure can refer to not only physical connection, but also electrical connection or signal connection. For example, it can be directly connected, that is, physically connected, or indirectly connected through at least one intermediate element, as long as the circuit is connected, or it can be the internal connection of two elements; signal connection can refer to signal connection through a circuit or through a media medium, such as radio waves. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0061] In order to improve the effective braking of the electronic safety gear in the event of a drive failure, see Figure 1 , Figure 1 An elevator safety clamp driving circuit 1000 provided in an embodiment of the present application is as follows: Figure 1 As shown, the circuit 1000 includes: a power supply circuit 100, a detection and diagnosis circuit 200, a first sampling circuit 300, a second sampling circuit 400, a drive control circuit 500 and an overcurrent detection circuit 600, wherein the drive control circuit 500 includes a drive signal generating circuit 501, a high-side switch 502 and a low-side switch 503.

[0062] The power supply circuit 100 is electrically connected to the first sampling circuit 300, and the detection and diagnosis circuit 200 is electrically connected to the first sampling circuit 300, the second sampling circuit 400, the drive control circuit 500 and the overcurrent detection circuit 600 respectively; the overcurrent detection circuit 600 is electrically connected to the drive signal generating circuit 501; the output end of the drive signal generating circuit 501 is electrically connected to the control end of the high side switch 502 and the control end of the low side switch 503 respectively; the first end of the high side switch 502 is electrically connected to the positive pole of the first working voltage 9VB, and the second end of the high side switch 502 is electrically connected to the positive pole of the electromagnet of the elevator safety clamp; the first end of the low side switch 503 is electrically connected to the negative pole of the first working voltage 9VB, and the second end of the low side switch 503 is electrically connected to the negative pole of the electromagnet of the elevator safety clamp.

[0063] The power supply circuit 100 is used to receive a power supply voltage, convert the power supply voltage, and output a first working voltage 9VB.

[0064] The first sampling circuit 300 is used to collect the power supply voltage and the first working voltage 9VB to obtain a power supply sampling signal.

[0065] The second sampling circuit 400 is used to collect the voltage between the positive electrode and the negative electrode of the electromagnet of the elevator safety clamp to obtain a loop voltage signal.

[0066] The overcurrent detection circuit 600 is used to monitor the current of the electromagnet of the elevator safety clamp, and obtain a loop overcurrent signal when the current of the electromagnet of the elevator safety clamp is greater than a preset current threshold.

[0067] The detection and diagnosis circuit 200 is used to regularly output a PWM diagnosis signal to the drive control circuit 500; and is also used to output a fault signal according to a power sampling signal, a loop voltage signal and a loop overcurrent signal.

[0068] The driving signal generating circuit 501 is used to receive and output a driving signal according to a trigger signal, a loop overcurrent signal and a PWM diagnostic signal, so that the high-side switch 502 and the low-side switch 503 control their switching states based on the driving signal.

[0069] The elevator safety clamp driving circuit in the present application can be a circuit module or a circuit in a driver of an electronic safety clamp, and the present application does not make specific restrictions on this. In addition, the elevator safety clamp in the present application is an electronic safety clamp, which needs to be driven by a driver. The electronic safety clamp includes an electromagnet, which is controlled to be in an attracted or released state by controlling whether the positive and negative poles of the electromagnet are energized, thereby controlling the state of the safety clamp, and further achieving the purpose of controlling the operation or braking of the elevator.

[0070] In one application scenario of this application, see Figure 1The elevator safety clamp driving circuit can be electrically connected to an external circuit or device, and the external circuit or device provides the power supply (including the positive pole and ground) required by the elevator safety clamp driving circuit, the safety ground, the trigger signal, the positive and negative pole interfaces of the electromagnet of the elevator safety clamp, and the fault port.

[0071] See also Figure 1 In one example, a trigger signal can be provided by turning on or off a trigger switch, and the safety clamp can be controlled by a drive control circuit, thereby controlling the state of the elevator. For example, when the trigger switch is turned on, the drive control circuit is used to close the electromagnet, the safety clamp is released, and the elevator runs normally; when the trigger switch is turned off, the drive control circuit is used to release the electromagnet, the safety clamp is closed, the elevator is braked, and the elevator car is clamped.

[0072] The power supply circuit converts the level of the connected power supply voltage and outputs the first working voltage. The first working voltage can be connected to the positive and negative poles of the electromagnet to energize the electromagnet, so that the electromagnet is attracted, the safety clamp is released, and the elevator operates normally. The power supply voltage can be 36VDC or 48VDC, and the first working voltage can be 9VDC.

[0073] The first sampling circuit monitors the power supply voltage and the first working voltage in real time, monitors the power supply by collecting the input voltage and the output voltage of the power supply circuit, obtains the power supply sampling signal, and sends the power supply sampling signal to the detection and diagnosis circuit, so that the detection and diagnosis circuit can monitor the key voltage (i.e., the input voltage and the output voltage of the power supply circuit) and handle in time when the key voltage is too high or too low.

[0074] The second sampling circuit is electrically connected to the positive and negative electrodes of the electromagnet of the elevator safety clamp, collects the voltage between the positive and negative electrodes of the electromagnet, obtains a loop voltage signal, and sends the loop voltage signal to the detection and diagnosis circuit, so that the detection and diagnosis circuit can monitor the switching loop of the electromagnet (i.e., the loop composed of the electromagnet, the high-side switch and the low-side switch), and can handle the fault in time when the switching loop of the electromagnet fails.

[0075] The overcurrent detection circuit monitors the current of the electromagnet of the elevator safety clamp. When the electromagnet has a large current or a short circuit, the current of the electromagnet will be greater than the preset current threshold, and the circuit overcurrent signal will be output, and the circuit overcurrent signal will be sent to the detection and diagnosis circuit and the drive signal generation circuit, so that the detection and diagnosis circuit can monitor the electromagnet and handle it in time when the electromagnet is short-circuited; and the drive signal generation circuit can control the high-side switch and the low-side switch to turn off by outputting a drive signal when the electromagnet is short-circuited. Among them, the preset current threshold can be set according to the needs of the user.

[0076] The detection and diagnosis circuit regularly outputs a PWM diagnosis signal to the drive control circuit, and the electromagnet of the elevator safety clamp is driven by the drive control circuit. After the detection and diagnosis circuit regularly outputs the PWM diagnosis signal, the voltage between the positive and negative poles of the electromagnet of the elevator safety clamp will change, and the second sampling circuit is used to monitor and diagnose the status of the electromagnet of the elevator safety clamp and its switch circuit in real time; the key voltage (i.e., the input voltage and output voltage of the power supply circuit) is monitored by the first sampling circuit, and the detection and diagnosis circuit determines whether there is an abnormality in the key voltage; the current of the electromagnet of the elevator safety clamp is monitored by the overcurrent detection circuit, and the detection and diagnosis circuit determines whether the electromagnet has an overcurrent. When the electromagnet of the elevator safety clamp and its switch circuit fail, the key voltage is abnormal, or the electromagnet has an overcurrent, a fault signal is output, and the fault signal is reported to the elevator controller through the fault port. It can be understood that the detection and diagnosis circuit regularly outputs a PWM diagnosis signal without affecting the normal operation of the electromagnet of the elevator safety clamp.

[0077] The drive signal generating circuit outputs a drive signal according to the trigger signal, the circuit overcurrent signal and the PWM diagnostic signal, so that the high-side switch and the low-side switch control their own switch states based on the drive signal. The high-side switch and the low-side switch receive the drive signal and control their own switch states according to the drive signal. For example, when the drive signal is at a high level, the high-side switch and the low-side switch are in the on state, the electromagnet is attracted, the safety clamp is released, and the elevator operates normally; when the drive signal is at a low level, the high-side switch and the low-side switch are in the off state, the electromagnet is released, the safety clamp is attracted, and the elevator brakes.

[0078] The high-side switch and low-side switch designed in the present application are redundant designs, the positive and negative electrodes of the first working voltage are electrically connected to the first end of the high-side switch and the first end of the low-side switch, respectively, the positive and negative electrodes of the electromagnet of the elevator safety clamp are electrically connected to the second end of the high-side switch and the second end of the low-side switch, respectively, and a current loop is formed through the high-side switch and the low-side switch. By designing two switches, when one of the switches has a short-circuit failure and cannot drive the elevator safety clamp to operate, the other switch can still drive the elevator safety clamp to operate according to the driving signal, thereby ensuring the braking effect of the elevator safety clamp and providing double safety protection for the elevator.

[0079] In the embodiment of the present application, through the redundant design of the high-side switch and the low-side switch, when one of the switches has a short-circuit fault, the other switch can still drive the elevator safety clamp to operate according to the driving signal, thereby improving the effective braking of the elevator safety clamp; in addition, the PWM diagnostic signal is outputted regularly through the detection and diagnosis circuit, and the key voltage, the electromagnet of the elevator safety clamp and the status of its switch circuit are monitored and diagnosed in real time based on the first sampling circuit, the second sampling circuit and the overcurrent detection circuit. When the electromagnet of the elevator safety clamp and its switch circuit fail, the key voltage is abnormal or the electromagnet has an overcurrent, a fault signal is output and the fault signal is reported to the elevator controller in time, so as to facilitate timely detection and processing of the fault.

[0080] In one possible embodiment, see Figure 1 The power supply circuit 100 includes: a first voltage stabilizing circuit 101, a charging circuit 102, a super capacitor circuit 103, a balancing circuit 104, a first grid-connected circuit 105, a second voltage stabilizing circuit 106 and a third voltage stabilizing circuit 107.

[0081] The input end of the first voltage stabilizing circuit 101 is connected to the power supply voltage, the output end of the first voltage stabilizing circuit 101 is electrically connected to the first input end of the charging circuit 102 and the first grid-connected circuit 105 respectively, the output end of the charging circuit 102 is electrically connected to the first input end of the supercapacitor circuit 103, the output end of the balancing circuit 104 is electrically connected to the second input end of the supercapacitor circuit 103, the output end of the supercapacitor circuit 103 is electrically connected to the second input end of the first grid-connected circuit 105, and the output end of the first grid-connected circuit 105 is electrically connected to the first sampling circuit 300, the second voltage stabilizing circuit 106 and the third voltage stabilizing circuit 107 respectively.

[0082] The first voltage stabilizing circuit 101 is used to convert the supply voltage and output a first voltage of 10V.

[0083] The charging circuit 102 is used to charge the super capacitor circuit 103 based on the first voltage 10V.

[0084] The supercapacitor circuit 103 is used to generate a first charging voltage of 9VA.

[0085] The balancing circuit 104 is used to balance the voltage of the capacitor of the supercapacitor circuit 103 .

[0086] The first grid-connected circuit 105 is used for combining the first voltage 10V and the first charging voltage 9VA to obtain a first working voltage 9VB.

[0087] The second voltage stabilizing circuit 106 is used for converting the first working voltage 9VB to obtain a second voltage 3.3V.

[0088] The third voltage stabilizing circuit 107 is used for converting the first working voltage 9VB to obtain a second working voltage 15V.

[0089] The first voltage stabilizing circuit performs level conversion on the power supply voltage, processes the power supply voltage of 36VDC or 48VDC, and outputs a first voltage of 10V. The first voltage of 10V is used as an input voltage of the first grid-connected circuit and also as an input voltage of the charging circuit, so that the charging circuit charges the supercapacitor circuit.

[0090] After charging, the supercapacitor circuit generates a first charging voltage of 9VA. When the power input voltage of the external circuit is cut off, the power stored in the supercapacitor circuit can continue to maintain the circuit operation for a period of time, thereby avoiding malfunction of the electromagnet of the elevator safety clamp due to a short-term power outage of the external circuit.

[0091] In a possible embodiment, the supercapacitor circuit includes a plurality of supercapacitors connected in series.

[0092] The balancing circuit can prevent the problem of over-voltage of some supercapacitors due to inconsistent capacitance when multiple supercapacitors are connected in series in the supercapacitor circuit. That is, the balancing circuit can balance the voltage of the capacitors in the supercapacitor circuit.

[0093] The first grid-connected circuit combines the first voltage 10V and the first charging voltage 9VA, and obtains the first working voltage 9VB according to the principle of high voltage priority output.

[0094] The second voltage stabilizing circuit performs level conversion on the first working voltage 9VB to obtain a second voltage 3.3V, which is used to power the devices in the elevator safety clamp driving circuit.

[0095] The third voltage stabilizing circuit performs level conversion on the first working voltage 9VB to obtain a second working voltage 15V, which is used to power the devices in the elevator safety clamp driving circuit.

[0096] In a possible embodiment, the drive control circuit further includes: an excitation switch 504 , a delay circuit 505 and a second grid-connected circuit 506 .

[0097] The first input end of the drive signal generating circuit 501 is used to access the trigger signal, the second input end of the drive signal generating circuit 501 is used to access the PWM diagnostic signal, the third input end of the drive signal generating circuit 501 is used to access the loop overcurrent signal, the fourth input end of the drive signal generating circuit 501 is used to access the second working voltage 15V, and the output end of the drive signal generating circuit 501 is electrically connected to the first control end of the excitation switch 504; the first end of the excitation switch 504 is connected to the power supply voltage, the second end of the excitation switch 504 is electrically connected to the first input end of the second grid-connected circuit 506, and the second control end of the excitation switch 504 is electrically connected to the output end of the delay circuit 505; the second end of the high-side switch 502 is electrically connected to the input end of the delay circuit 505 and the second input end of the second grid-connected circuit 506 respectively; the output end of the second grid-connected circuit 506 is electrically connected to the positive pole of the electromagnet of the elevator safety clamp; the input end of the overcurrent detection circuit 600 is electrically connected to the low-side switch 503.

[0098] The delay circuit 505 is used to output a delay signal.

[0099] The excitation switch 504 is used to output a power supply voltage according to a driving signal so that the electromagnet of the elevator safety clamp is attracted; it is also used to control itself to no longer output a power supply voltage when receiving a delay signal so that the electromagnet of the elevator safety clamp continues to be attracted under the control of the first working voltage.

[0100] The second grid-connected circuit 506 is used to combine the first working voltage and the power supply voltage to obtain a driving voltage to drive the elevator safety clamp.

[0101] After the delay circuit detects the signal output by the high-side switch that drives the electromagnet of the elevator safety clamp, it starts timing, outputs a delay signal after a preset delay time, and transmits the delay signal to the excitation switch, so that when the excitation switch receives the delay signal, it controls itself to no longer output the power supply voltage.

[0102] The second grid-connected circuit combines the first working voltage 9VB and the power supply voltage, obtains a driving voltage based on the principle of high voltage priority output, and transmits the driving voltage to the positive electrode of the electromagnet of the elevator safety clamp to drive the elevator safety clamp.

[0103] The first end of the excitation switch is connected to the power supply voltage, and the second end of the excitation switch is electrically connected to the first input end of the second grid-connected circuit, which can provide a high voltage for the electromagnet of the elevator safety clamp to effectively attract it. The second control end of the excitation switch is electrically connected to the output end of the delay circuit, and its own state can be controlled by the delay signal output by the delay circuit.

[0104] The excitation switch only works in the initial stage when the electromagnet of the driving safety clamp is attracted and then releases the brake on the elevator car. Specifically, at the first power-on operation after the elevator is installed or the starting working stage when the elevator car needs to be released after being braked by the safety clamp, after the driving signal generating circuit outputs the driving signal, the excitation switch, the high-side switch and the low-side switch are all turned on. Based on the principle of high voltage priority output of the second grid-connected circuit, since the power supply voltage is higher than the first working voltage, at this time, the second grid-connected circuit outputs the power supply voltage to make the electromagnet of the elevator safety clamp attracted, that is, the elevator safety clamp is working normally under the drive of the power supply voltage; in order to save electric energy during the normal operation of the elevator, it is necessary to start timing after the normal operation of the elevator, output a delay signal after a preset delay time, and turn off the power supply voltage output by the excitation switch through the delay signal. At this time, the second grid-connected circuit outputs the first working voltage, and the electromagnet of the elevator safety clamp continues to be attracted under the action of the first working voltage, and the elevator can still operate normally.

[0105] In a possible embodiment, the circuit 1000 further includes: a protection circuit 700 .

[0106] The input end of the protection circuit 700 is used to access the power input voltage, and the output end of the protection circuit 700 is electrically connected to the input end of the power circuit 100 .

[0107] The protection circuit 700 is used to protect the power input voltage from reverse connection and surge, and output the power supply voltage.

[0108] The power input voltage is connected from an external circuit and needs to be protected against reverse connection and surge before being input to the power circuit. In an example, a diode and a TVS tube (Transient Voltage Suppressor) can be used for reverse connection and surge protection.

[0109] An embodiment of the present application also provides an elevator safety clamp driving method, which is as follows.

[0110] S1, monitoring the power supply voltage and the first working voltage to obtain a power supply sampling signal.

[0111] S2, monitoring the voltage between the positive and negative electrodes of the electromagnet of the elevator safety clamp to obtain a loop voltage signal.

[0112] S3, monitoring the current of the electromagnet of the elevator safety clamp, and obtaining a circuit overcurrent signal when the current of the electromagnet of the elevator safety clamp is greater than a preset current threshold.

[0113] S4, output PWM diagnostic signal regularly.

[0114] S5, outputting a fault signal according to the power sampling signal, the loop voltage signal and the loop overcurrent signal.

[0115] S6, receiving and outputting a driving signal according to the trigger signal, the loop overcurrent signal and the PWM diagnostic signal, so that the high-side switch and the low-side switch control their own switching states based on the driving signal.

[0116] In a possible embodiment, after executing the above step S6, the method further includes:

[0117] S7, obtain the delayed signal.

[0118] S8, outputting an excitation voltage according to the driving signal to attract the electromagnet of the elevator safety clamp.

[0119] S9, when the delay signal is received, the excitation voltage is no longer output, so that the electromagnet of the elevator safety clamp continues to be attracted under the control of the first working voltage.

[0120] The embodiment of the present application further provides a driver, comprising: the elevator safety clamp driving circuit as described above. The driver is used in conjunction with the elevator safety clamp to drive the elevator safety clamp.

[0121] The present application also provides an elevator safety clamp driving system, see Figure 1 ,like Figure 1 As shown, the system includes: a trigger switch, an elevator safety clamp, an elevator controller and the above-mentioned driver; the driver is electrically connected to the trigger switch, the elevator safety clamp and the elevator controller respectively.

[0122] Trigger switch, used to output trigger signal.

[0123] The elevator controller is used to receive the fault signal.

[0124] The elevator controller can control the operation of the elevator. After receiving a fault signal, it processes the fault signal and makes a decision on whether to control the elevator to continue running based on the fault signal.

[0125] See also Figure 1 The present application provides an elevator safety clamp drive system. In one example, the system can be a test device for a driver, wherein a trigger switch, an elevator safety clamp, and an elevator controller are all external circuits. At the same time, the external circuit also provides the driver's power supply (i.e., power input voltage and power ground) and safety ground.

[0126] For the test device of the driver, a trigger signal can be provided by the state of the trigger switch, so that the drive signal generating circuit outputs a drive signal. For example, when the trigger switch is turned on, the drive signal is used to make the electromagnet close, the safety clamp is released, and the elevator runs normally; when the trigger switch is turned off, the drive signal is used to make the electromagnet release, the safety clamp is closed, the elevator brakes, and the elevator car is clamped.

[0127] When the detection and diagnosis circuit determines that the elevator safety clamp is faulty, it outputs a fault signal and transmits the fault signal to the elevator controller, which determines the operation of the elevator, fault prompts, etc.

[0128] See also Figure 2 , Figure 2 A working diagram of an elevator safety clamp driving system provided in an embodiment of the present application is as follows: Figure 2 As shown, the workflow is as follows:

[0129] First, the power input voltage of the external circuit is connected, and the supercapacitor circuit is charged with the voltage until the charging is completed, so as to obtain all the voltages required by the elevator safety clamp drive circuit.

[0130] Secondly, it is detected whether the trigger switch is turned on. When the trigger switch is turned off, the driving signal is used to release the electromagnet, the safety clamp is attracted, the elevator is braked, and the elevator car is clamped; when the trigger switch is turned on, the driving signal generating circuit outputs a driving signal to the excitation switch, the high-side switch and the low-side switch, and the electromagnet of the elevator safety clamp is attracted after receiving the power supply voltage output by the excitation switch. At this time, the safety clamp is released and the elevator runs normally. Before the delay time is up, the electromagnet of the elevator safety clamp is attracted under the action of the power supply voltage output by the excitation switch, and the elevator runs normally; after the delay time is up, the delay circuit outputs a delay signal, and the power supply voltage output by the excitation switch is turned off through the delay signal. At this time, the second grid-connected circuit outputs the first working voltage 9VB, and the electromagnet of the elevator safety clamp continues to be attracted under the action of the first working voltage 9VB, and the elevator can still run normally.

[0131] Before the timing time is up, it is detected whether the trigger switch is turned on. When the trigger switch is turned off, the electromagnet is released by the driving signal, the safety clamp is attracted, the elevator is braked, and the elevator car is clamped. When the trigger switch is turned on, the electromagnet of the elevator safety clamp continues to be attracted under the action of the first working voltage 9VB, and the elevator can still operate normally. After the timing time is up, the detection and diagnosis circuit outputs a PWM diagnosis signal to the drive control circuit at a regular time, and the voltage between the positive and negative poles of the electromagnet is collected through the second sampling circuit. The detection and diagnosis circuit determines whether the switch circuit of the electromagnet (i.e., the circuit composed of the electromagnet, the high-side switch, and the low-side switch) has a short circuit or a circuit break; the key voltage (i.e., the input voltage and output voltage of the power supply circuit) is monitored by the first sampling circuit, and the detection and diagnosis circuit determines whether the key voltage is abnormal; the current of the electromagnet of the elevator safety clamp is monitored by the overcurrent detection circuit, and the detection and diagnosis circuit determines whether the electromagnet has an overcurrent. When any of the above faults occurs, the detection and diagnosis circuit outputs a fault signal and reports the fault signal to the elevator controller. When the above faults do not occur, continue to detect whether the trigger switch is turned on. After reporting the fault signal to the elevator controller, continue to detect whether the trigger switch is turned on.

[0132] The present application also provides an electronic device, see Figure 3 , including a processor 301, a communication interface 302, a memory 303 and a communication bus 304, wherein the processor 301, the communication interface 302, and the memory 303 communicate with each other through the communication bus 304;

[0133] Memory 303, used for storing computer programs;

[0134] The processor 301 is used to implement any step of the elevator safety clamp driving method described in the present application when executing the program stored in the memory 303.

[0135] The communication bus mentioned in the above electronic device can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0136] The communication interface is used for communication between the above electronic device and other devices.

[0137] The memory may include a random access memory (RAM) or a non-volatile memory (NVM), such as at least one disk memory. Optionally, the memory may also be at least one storage device located away from the aforementioned processor.

[0138] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0139] In another embodiment provided in the present application, a computer-readable storage medium is provided, in which a computer program is stored. When the computer program is executed by a processor, the steps of any of the above-mentioned elevator safety clamp driving methods are implemented.

[0140] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state hard disk Solid State Disk (SSD)), etc.

[0141] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An elevator safety clamp driving circuit, characterized in that: The circuit comprises: a power supply circuit, a detection and diagnosis circuit, a first sampling circuit, a second sampling circuit, a drive control circuit and an overcurrent detection circuit, wherein the drive control circuit comprises a drive signal generating circuit, a high-side switch and a low-side switch; The power supply circuit is electrically connected to the first sampling circuit, the detection and diagnosis circuit is electrically connected to the first sampling circuit, the second sampling circuit, the drive control circuit and the overcurrent detection circuit respectively; the overcurrent detection circuit is electrically connected to the drive signal generating circuit; the output end of the drive signal generating circuit is electrically connected to the control end of the high side switch and the control end of the low side switch respectively; the first end of the high side switch is electrically connected to the positive pole of the first working voltage, and the second end of the high side switch is electrically connected to the positive pole of the electromagnet of the elevator safety clamp; the first end of the low side switch is electrically connected to the negative pole of the first working voltage, and the second end of the low side switch is electrically connected to the negative pole of the electromagnet of the elevator safety clamp; The power supply circuit is used to receive a power supply voltage, convert the power supply voltage, and output the first working voltage; The first sampling circuit is used to collect the power supply voltage and the first working voltage to obtain a power supply sampling signal; The second sampling circuit is used to collect the voltage between the positive electrode and the negative electrode of the electromagnet of the elevator safety clamp to obtain a loop voltage signal; The overcurrent detection circuit is used to monitor the current of the electromagnet of the elevator safety clamp, and obtain a circuit overcurrent signal when the current of the electromagnet of the elevator safety clamp is greater than a preset current threshold; The detection and diagnosis circuit is used to regularly output a PWM diagnosis signal to the drive control circuit; and is also used to output a fault signal according to the power sampling signal, the loop voltage signal and the loop overcurrent signal; The drive signal generating circuit is used to receive and output a drive signal according to a trigger signal, the loop overcurrent signal and the PWM diagnostic signal, so that the high-side switch and the low-side switch control their own switching states based on the drive signal.

2. The elevator safety clamp driving circuit according to claim 1, characterized in that: The power supply circuit includes: a first voltage stabilizing circuit, a charging circuit, a super capacitor circuit, a balancing circuit, a first grid-connected circuit, a second voltage stabilizing circuit and a third voltage stabilizing circuit; The input end of the first voltage stabilizing circuit is connected to the supply voltage, the output end of the first voltage stabilizing circuit is electrically connected to the first input end of the charging circuit and the first grid-connected circuit respectively, the output end of the charging circuit is electrically connected to the first input end of the supercapacitor circuit, the output end of the balancing circuit is electrically connected to the second input end of the supercapacitor circuit, the output end of the supercapacitor circuit is electrically connected to the second input end of the first grid-connected circuit, and the output end of the first grid-connected circuit is electrically connected to the first sampling circuit, the second voltage stabilizing circuit and the third voltage stabilizing circuit respectively; The first voltage stabilizing circuit is used to convert the supply voltage and output a first voltage; The charging circuit is used to charge the supercapacitor circuit based on the first voltage; The supercapacitor circuit is used to generate a first charging voltage; The balancing circuit is used to balance the voltage of the capacitor of the supercapacitor circuit; The first grid-connected circuit is used to combine the first voltage and the first charging voltage to obtain a first working voltage; The second voltage stabilizing circuit is used to convert the first operating voltage to obtain a second voltage; The third voltage stabilizing circuit is used to convert the first operating voltage to obtain a second operating voltage.

3. The elevator safety clamp driving circuit according to claim 2, characterized in that: The drive control circuit also includes: an excitation switch, a delay circuit and a second grid-connected circuit; The first input end of the drive signal generating circuit is used to access the trigger signal, the second input end of the drive signal generating circuit is used to access the PWM diagnostic signal, the third input end of the drive signal generating circuit is used to access the loop overcurrent signal, the fourth input end of the drive signal generating circuit is used to access the second working voltage, and the output end of the drive signal generating circuit is electrically connected to the first control end of the excitation switch; the first end of the excitation switch is connected to the supply voltage, the second end of the excitation switch is electrically connected to the first input end of the second grid-connected circuit, and the second control end of the excitation switch is electrically connected to the output end of the delay circuit; the second end of the high-side switch is electrically connected to the input end of the delay circuit and the second input end of the second grid-connected circuit respectively; the output end of the second grid-connected circuit is electrically connected to the positive pole of the electromagnet of the elevator safety clamp; the input end of the overcurrent detection circuit is electrically connected to the low-side switch; The delay circuit is used to output a delay signal; The excitation switch is used to output the supply voltage according to the drive signal so that the electromagnet of the elevator safety clamp is attracted; and is also used to control itself to stop outputting the supply voltage when receiving the delay signal so that the electromagnet of the elevator safety clamp continues to be attracted under the control of the first working voltage; The second grid-connected circuit is used to combine the first working voltage and the power supply voltage to obtain a driving voltage to drive the elevator safety clamp.

4. The elevator safety clamp driving circuit according to claim 1, characterized in that: The circuit further comprises: a protection circuit; The input end of the protection circuit is used to access the power supply input voltage, and the output end of the protection circuit is electrically connected to the input end of the power supply circuit; The protection circuit is used to protect the power input voltage from reverse connection and surge, and output the power supply voltage.

5. The elevator safety clamp driving circuit according to claim 2, characterized in that: The supercapacitor circuit includes a plurality of supercapacitors connected in series.

6. A method for driving an elevator safety clamp, characterized in that: The method comprises: Monitoring the power supply voltage and the first working voltage to obtain a power supply sampling signal; Monitoring the voltage between the positive and negative electrodes of the electromagnet of the elevator safety clamp to obtain a loop voltage signal; The current of the electromagnet of the elevator safety clamp is monitored, and when the current of the electromagnet of the elevator safety clamp is greater than a preset current threshold, a circuit overcurrent signal is obtained; Output PWM diagnostic signal regularly; Outputting a fault signal according to the power sampling signal, the loop voltage signal and the loop overcurrent signal; A driving signal is received and output according to the trigger signal, the loop overcurrent signal and the PWM diagnostic signal, so that the high-side switch and the low-side switch control their switching states based on the driving signal.

7. The elevator safety clamp driving method according to claim 6, characterized in that: After receiving and outputting a drive signal according to the trigger signal, the loop overcurrent signal and the PWM diagnostic signal, so that the high-side switch and the low-side switch control their own switch states based on the drive signal, the method further includes: Get the delayed signal; According to the driving signal, outputting an excitation voltage to attract the electromagnet of the elevator safety clamp; When the delay signal is received, the excitation voltage is no longer output, so that the electromagnet of the elevator safety clamp continues to be attracted under the control of the first working voltage.

8. A driver, characterized in that: include: An elevator safety clamp drive circuit as described in any one of claims 1 to 5.

9. An elevator safety clamp driving system, characterized in that: include: A trigger switch, an elevator safety clamp, an elevator controller, and a driver as claimed in claim 8; The driver is electrically connected to the trigger switch, the elevator safety clamp and the elevator controller respectively; The trigger switch is used to output a trigger signal; The elevator controller is used to receive a fault signal.

10. An electronic device, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; Memory, used to store computer programs; The processor is used to implement the steps of the elevator safety clamp driving method described in any one of claims 6-7 when executing the program stored in the memory.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the elevator safety clamp driving method according to any one of claims 6 to 7 are implemented.

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