CN220510764U - Braking protection circuit and elevator braking system - Google Patents

Abstract

The application discloses braking protection circuit and elevator braking system, braking protection circuit is applied to elevator braking circuit, includes: the voltage input end is electrically connected with the tail end of the safety loop so as to detect the tail end voltage of the safety loop; the signal output end is triggered by the terminal voltage to output a switching signal; the signal output end is electrically connected with the enabling end of the braking power supply in the elevator braking circuit, or is electrically connected with the controlled end of the switching element in the braking protection circuit, and the switching element is connected in series in the output loop of the braking power supply. Through the structure, the safety of elevator braking is improved.

Description

Braking protection circuit and elevator braking system

Technical Field

The application relates to the technical field of elevator braking, in particular to a braking protection circuit and an elevator braking system.

Background

In an elevator system, an auxiliary contact of an operation contactor is connected in series in a band-type brake loop of an elevator, when a safety loop of the elevator is suddenly disconnected or the system is accidentally powered down, the auxiliary contact is disconnected, trailing current in a brake coil can be rapidly cut off, an oversized sliding falling distance of a car is prevented, and operation safety is guaranteed.

In practical application, an absorption loop is connected to a brake loop connected with a contactor contact, and the absorption loop is used for absorbing arc discharge energy when the contactor is disconnected, so as to protect the contactor. However, the additional absorption loop can slow down the current attenuation speed in the brake coil, so that the brake can not act rapidly easily, and the elevator has an excessive sliding falling distance, so that the operation safety is affected. In view of this, how to improve the safety of elevator braking is a problem to be solved.

Disclosure of Invention

The technical problem that this application mainly solves is to provide a braking protection circuit and elevator braking system, helps improving the security of elevator braking.

To solve the above-mentioned problem, a first aspect of the present application provides a brake protection circuit applied to an elevator brake circuit, the brake protection circuit comprising: the voltage input end is electrically connected with the tail end of the safety loop so as to detect the tail end voltage of the safety loop; the signal output end is triggered by the terminal voltage to output a switching signal; the signal output end is electrically connected with the enabling end of the braking power supply in the elevator braking circuit, or is electrically connected with the controlled end of the switching element in the braking protection circuit, and the switching element is connected in series in the output loop of the braking power supply.

Therefore, the voltage input end of the brake protection circuit is electrically connected with the tail end of the safety loop to detect the tail end voltage of the safety loop, the tail end voltage can be used for judging whether the current elevator normally operates, the signal output end of the brake protection circuit is triggered by the tail end voltage to generate and output a switching signal, and the switching signal is connected into the elevator brake circuit, the signal output end is electrically connected with the enabling end of a brake power supply in the elevator brake circuit, or the signal output end is electrically connected with the controlled end of a switching element in the brake protection circuit, and the switching signal is connected in series in the output loop of the brake power supply, or is used for controlling the on-off of the brake power supply, or controlling the on-off of the switching element, when the elevator does not normally operate, the voltage input end detects the tail end voltage abnormality, and outputs the switching signal for switching off the brake power supply or switching off the switching element, so that the current loop in the elevator brake circuit is timely cut off, and the current loop in the elevator brake circuit is cut off due to the fact that the transmission speed of the switching signal in the elevator brake circuit is higher than the cutting-off speed of a contactor contact in the elevator brake circuit, when the elevator operation abnormality leads to the break of the contactor contact in the elevator, the current loop in the elevator brake circuit is cut off, the phenomenon of the elevator brake circuit is as well, the contact is caused, the contact is broken, the damage, and the occurrence, the brake is caused, and the brake coil is as well, the brake is as the, and the safety phenomenon is better, and the response to the elevator brake coil is effectively is shortened.

The brake protection circuit comprises an analog-to-digital conversion circuit, wherein the input end of the analog-to-digital conversion circuit is electrically connected with the voltage input end so as to carry out analog-to-digital conversion on the terminal voltage, and the output end of the analog-to-digital conversion circuit is electrically connected with the signal output end.

Therefore, the input end of the analog-to-digital conversion circuit is electrically connected with the voltage input end, the terminal voltage detected by the safety loop is subjected to analog-to-digital conversion to obtain a digital signal for controlling the braking power supply or the switching element, the output end of the analog-to-digital conversion circuit is electrically connected with the signal output end, the digital signal is transmitted to the enabling end of the braking power supply or the controlled end of the switching element as a switching signal, the elevator braking circuit is effectively protected, and the safety of elevator braking is improved.

The brake protection circuit further comprises a filter circuit, wherein the input end of the filter circuit is electrically connected with the voltage input end, and the output end of the filter circuit is electrically connected with the input end of the analog-to-digital conversion circuit.

Therefore, the input end of the filter circuit is electrically connected with the voltage input end to filter the terminal voltage, and the output end of the filter circuit is electrically connected with the input end of the analog-to-digital conversion circuit to improve the accuracy of analog-to-digital conversion.

The brake protection circuit comprises a transformer, wherein a primary coil of the transformer is electrically connected with the voltage input end, and a secondary coil of the transformer is electrically connected with the signal output end.

Therefore, a primary coil of the transformer in the brake protection circuit is electrically connected with the voltage input end so as to be connected with the tail end voltage of the safety loop transmitted from the voltage input end, voltage conversion is realized, the tail end voltage is converted into a switching signal, a secondary coil of the transformer is electrically connected with the signal output end, transmission of the switching signal is realized, and the practicability of the brake protection circuit is improved.

The braking protection circuit comprises a photoelectric coupler, a light emitting source of the photoelectric coupler is electrically connected with the voltage input end, and a light receiver of the photoelectric coupler is electrically connected with the signal output end.

Therefore, a light emitting source of the photoelectric coupler in the brake protection circuit is electrically connected with the voltage input end so as to be connected with the tail end voltage of the safety loop transmitted from the voltage input end, voltage conversion is realized, the tail end voltage is converted into a switching signal, the light receiving end of the photoelectric coupler is electrically connected with the signal output end, the transmission of the switching signal is realized, and the practicability of the brake protection circuit is improved.

The switching element comprises any one of a MOS tube, an IGBT and a triode.

Therefore, the electronic switch is used as a switching element to be connected to the brake circuit, and the practicability of the brake protection circuit is improved.

The brake protection circuit further comprises a voltage sampling circuit, the input end of the voltage sampling circuit is electrically connected with the tail end of the safety loop, and the output end of the voltage sampling circuit is electrically connected with the voltage input end.

Therefore, the input end of the voltage sampling circuit is electrically connected with the tail end of the safety circuit, so that the voltage of the safety circuit is sampled, the output end of the voltage sampling circuit is electrically connected with the voltage input end to transmit the sampled voltage, the accuracy of sampling the voltage at the tail end of the safety circuit is improved, and the accuracy of the brake protection circuit is improved.

The brake protection circuit further comprises a voltage follower circuit, the input end of the voltage follower circuit is electrically connected with the tail end of the safety loop, and the output end of the voltage follower circuit is electrically connected with the input end of the voltage sampler.

Therefore, the input end of the voltage follower circuit is electrically connected with the tail end of the safety loop, and the output end of the voltage follower circuit is electrically connected with the input end of the voltage sampler, so as to buffer the tail end voltage of the safety loop and improve the safety of the brake protection loop.

In order to solve the above problem, a second aspect of the present application provides an elevator brake system, which comprises a safety circuit, an elevator brake circuit and the brake protection circuit described in the first aspect, wherein the safety circuit and the elevator brake circuit are respectively electrically connected with the brake protection circuit.

Therefore, the brake protection circuit is connected to the terminal voltage of the safety circuit and triggered by the terminal voltage to generate a switch signal, and the on-off of the brake power supply output circuit in the brake circuit is controlled based on the switch signal, so that the elevator brake circuit is effectively protected, and the safety of elevator brake is improved.

The elevator braking circuit comprises a braking power supply, a contactor contact and a band-type brake coil of the traction machine, wherein the contactor contact and the band-type brake coil are connected in series to an output loop of the braking power supply.

Therefore, when the elevator does not normally run, the voltage input end detects the abnormal terminal voltage, outputs a switching signal for switching off a braking power supply or switching off a switching element, and realizes timely cutting off of a current loop in the elevator braking circuit.

Drawings

FIG. 1 is a schematic circuit diagram of one embodiment of a brake protection circuit of the present application;

FIG. 2 is a circuit schematic of yet another embodiment of the brake protection circuit of the present application;

fig. 3 is a schematic frame diagram of an embodiment of an elevator brake system of the present application.

Detailed Description

The following describes the embodiments of the present application in detail with reference to the drawings.

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, interfaces, techniques, etc., in order to provide a thorough understanding of the present application.

The terms "system" and "network" are often used interchangeably herein. The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship. Further, "a plurality" herein means two or more than two.

Referring to fig. 1 and 2 in combination, fig. 1 is a circuit schematic of an embodiment of a brake protection circuit 10 of the present application, and fig. 2 is a circuit schematic of another embodiment of the brake protection circuit 10 of the present application. As shown in fig. 1 and fig. 2, the brake protection circuit 10 is applied to an elevator brake circuit 20, and comprises a voltage input end 11 and a signal output end 12, when the elevator does not normally operate, the voltage input end 11 detects that the terminal voltage is abnormal, outputs a switching signal for switching off a brake power supply 21 or a switching element 13, and realizes timely switching off of a current loop in the elevator brake circuit 20, and since the transmission speed of the switching signal in the elevator brake circuit 20 is faster than the switching-off speed of a contactor contact 22, when the contactor contact 22 is switched off due to abnormal elevator operation, the brake protection circuit 10 switches off the current loop in the elevator brake circuit 20, so that the phenomenon that the contactor is damaged due to the arcing phenomenon of the contactor is reduced as much as possible, and the response speed of elevator braking is improved as much as possible, so as to shorten the braking distance of a band-type brake coil 23, thereby effectively protecting the elevator brake circuit 20 and being beneficial to improving the safety of elevator braking.

In one implementation scenario, the voltage input end 11 of the brake protection circuit 10 is electrically connected with the end of the safety loop 30 to detect the end voltage of the safety loop 30, the end voltage can be used for judging whether the current elevator is operating normally, the signal output end 12 of the brake protection circuit 10 is triggered by the end voltage to generate and output a switch signal, the switch signal is connected to the elevator brake circuit 20, the on and off of the brake power supply 21 output loop in the brake circuit is controlled based on the switch signal, the situation that the contactor is damaged due to the arcing phenomenon of the contactor contacts 22 is reduced, and the elevator brake circuit 20 is further effectively protected, so that the safety of elevator braking is improved.

In a specific implementation scenario, the signal output end 12 is electrically connected with the enabling end 211 of the brake power supply 21 in the elevator brake circuit 20, the signal output end 12 is triggered by the safety loop 30 to generate a switching signal for controlling the brake power supply 21, when an accident and emergency braking happen to the elevator, the switching signal is used for rapidly cutting off the current output of the brake power supply 21, and since the transmission speed of the switching signal in the elevator brake circuit 20 is faster than the opening speed of the contactor contact 22, when the contactor contact 22 is opened due to abnormal operation of the elevator, the brake protection circuit 10 cuts off the current loop in the elevator brake circuit 20, the phenomenon that the contactor is damaged due to the arcing phenomenon of the contactor is reduced as much as possible, the braking distance of the band-type brake coil 23 is not influenced, the elevator brake circuit 20 is effectively protected, and the safety of elevator braking is improved.

In another specific implementation scenario, the signal output end 12 is electrically connected with the controlled end 131 of the switching element 13 in the brake protection circuit 10, and the switching element 13 is connected in series in an output loop of the brake power supply 21, when an accident and emergency braking occurs to the elevator, the switching signal is used for rapidly switching off the switching element 13 and cutting off the current output in the output loop, and since the transmission speed of the switching signal in the elevator brake circuit 20 is faster than the opening speed of the contactor contact 22, when the contactor contact 22 is opened due to the abnormal operation of the elevator, the brake protection circuit 10 cuts off the current loop in the elevator brake circuit 20, so that the arcing phenomenon of the contact does not occur, thereby effectively protecting the elevator brake circuit 20 and helping to improve the safety of the elevator brake.

The type of the brake power supply 21 and the position of the switching element 13 connected in series in the brake circuit are not limited in this application.

In one implementation scenario, the contactor contacts 22 in the braking circuit include an operation contactor contact 221 and a band-type brake contactor contact 222, in order to prevent the band-type brake contactor contact 222 from being opened under a high current condition to generate arc-pulling energy, an absorption loop 24 is connected in series to the rear end of the band-type brake contactor contact 222, and when the band-type brake contactor contact 222 is suddenly opened, the absorption loop 24 can effectively absorb the arc-pulling energy to protect the contact. When the safety circuit 30 of the elevator is suddenly disconnected or the system is accidentally powered down, the running contactor contact 221 is disconnected, so that the trailing current in the band-type brake coil 23 can be rapidly cut off, the excessive sliding falling distance of the elevator car is prevented, and the running safety is ensured, at the moment, the brake protection circuit 10 cuts off the current circuit in the elevator brake circuit 20, so that the generation of arc-pulling energy is reduced as much as possible under the condition that the elevator brake circuit 20 is not connected into the absorption circuit 24, the elevator brake circuit 20 is further effectively protected, and the safety of elevator brake is improved.

In a specific implementation, the switching element 13 is a MOS transistor, typically a metal-oxide-semiconductor field effect transistor, or metal-insulator-semiconductor. There are three poles, G (gate), S (source), D (drain), respectively. The source and drain of the MOS transistor are interchangeable, and they are both N-type regions formed in the P-type back gate. The high-voltage power supply has the advantages of high input resistance (107-1015 omega), low noise, low power consumption, large dynamic range, easiness in integration, no secondary breakdown phenomenon, wide safe working area and the like. The MOS tube is connected in series to the braking circuit, and when the elevator is accidentally braked and emergently braked, the switching signal is used for rapidly switching off the MOS tube, cutting off the current output in the output loop and improving the safety of elevator braking.

In another specific implementation scenario, the switching element 13 is an IGBT, and the IGBT (Insulated Gate Bipolar Transistor ) is a composite fully-controlled voltage-driven power semiconductor device composed of a (Bipolar Junction Transistor, BJT) bipolar Transistor and an insulated gate field effect Transistor (Metal Oxide Semiconductor, MOS), and has advantages of both high input impedance of the (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET) MOSFET and low on-voltage drop of the power Transistor (Giant Transistor, GTR). The GTR saturation voltage is reduced, the current carrying density is high, but the driving current is high; the MOSFET has small driving power, high switching speed, large conduction voltage drop and small current carrying density. The IGBT combines the advantages of the two devices, and has small driving power and reduced saturation voltage. The IGBT is connected in series to the braking circuit, when the elevator is braked accidentally and emergently, the switch signal is used for rapidly switching off the IGBT, cutting off the current output in the output loop, and improving the safety of elevator braking.

In another specific implementation scenario, the switching element 13 is a transistor, which is referred to as a semiconductor transistor, also referred to as a bipolar transistor or a transistor, and is a semiconductor device for controlling current. The function of the circuit is to amplify weak signals into electric signals with larger amplitude values, and the circuit is also used as a contactless switch. The triode is connected in series to the braking circuit, and when the elevator is unexpected and braked urgently, the switching signal is used for rapidly switching off the triode, cutting off the current output in the output loop and improving the safety of elevator braking.

In one implementation scenario, the brake protection circuit 10 includes an analog-to-digital conversion circuit (not shown), where an input end of the analog-to-digital conversion circuit is electrically connected to the voltage input end 11, and performs analog-to-digital conversion on the terminal voltage detected by the safety circuit 30 to obtain a digital signal for controlling the brake power supply 21 or the switching element 13, and an output end of the analog-to-digital conversion circuit is electrically connected to the signal output end 12, and transmits the digital signal as a switching signal to the enable end 211 of the brake power supply 21 or the controlled end 131 of the switching element 13, so as to effectively protect the elevator brake circuit 20, and help to improve the safety of elevator braking.

In a specific implementation scenario, the analog-to-digital conversion circuit is an analog-to-digital converter, and converts an analog signal with continuous time and continuous amplitude into a digital signal with discrete time and discrete amplitude, so that the analog-to-digital conversion generally includes 4 processes of sampling, holding, quantizing and encoding. In practical circuits, some of these processes are combined, e.g., sample and hold, quantization and encoding are often performed simultaneously during the conversion process. Specifically, the terminal voltage of the input safety circuit 30 is sampled at predetermined time intervals, and compared with a series of standard digital signals, the digital signals are successively converged until the two signals are equal, and then a binary number representing the signal is displayed, to obtain a switching signal usable for controlling the brake power supply 21 or the switching element 13.

In one implementation scenario, the brake protection circuit 10 further includes a filter circuit (not shown), where an input end of the filter circuit is electrically connected to the voltage input end 11, and filters the terminal voltage, and an output end of the filter circuit is electrically connected to an input end of the analog-to-digital conversion circuit, so as to improve accuracy of analog-to-digital conversion.

In one specific implementation scenario, the filter circuit is composed of reactive elements, such as a capacitor connected in parallel across a load resistor, or an inductor connected in series with the load, and various complex filter circuits composed of capacitors and inductors. When the current flowing through the inductor changes, the induced electromotive force generated in the inductor coil will prevent the change in current. When the current passing through the inductance coil increases, the self-induced electromotive force generated by the inductance coil is opposite to the current direction, so that the increase of the current is prevented, and meanwhile, a part of electric energy is converted into magnetic field energy to be stored in the inductance; when the current through the inductor decreases, the self-induced electromotive force is in the same direction as the current, preventing the decrease in current, while releasing the stored energy to compensate for the decrease in current. Therefore, after the inductance filtering, not only the pulsation of the load current and the voltage is reduced, the waveform becomes smooth, but also the conduction angle of the rectifier diode is increased, the interference on the terminal voltage acquisition of the safety loop 30 is reduced as much as possible, and the accuracy of the terminal voltage acquisition is improved.

In one implementation scenario, the brake protection circuit 10 includes a transformer (not shown), a primary coil of the transformer in the brake protection circuit 10 is electrically connected to the voltage input terminal 11 to access an end voltage of the safety circuit 30 transmitted from the voltage input terminal 11, to implement voltage conversion, to convert the end voltage into a switching signal, and a secondary coil of the transformer is electrically connected to the signal output terminal 12, to implement transmission of the switching signal, and to improve the practicality of the brake protection circuit 10.

In one particular implementation, the primary components of the transformer are a primary coil, a secondary coil, and an iron core (magnetic core).

In one implementation scenario, the brake protection circuit 10 includes a photo coupler (not shown), where a light emitting source of the photo coupler is electrically connected to the voltage input terminal 11 to access an end voltage of the safety circuit 30 transmitted from the voltage input terminal 11, so as to implement voltage conversion, convert the end voltage into a switching signal, and a light receiving terminal of the photo coupler is electrically connected to the signal output terminal 12, so as to implement transmission of the switching signal, thereby improving the practicality of the brake protection circuit 10.

In one particular implementation, the optocoupler is an electro-optic-to-electrical conversion device that transmits electrical signals over an optical medium. It is composed of two parts of light source and light receiver. The light source and the light receiver are assembled in the same airtight shell and are isolated by a transparent insulator. The pins of the light-emitting source are input ends, the pins of the light receiver are output ends, the common light-emitting source is a light-emitting diode, and the light receiver is a photodiode, a phototriode and the like. The use of the photocoupler can improve the anti-interference capability of the brake protection circuit 10, thereby contributing to the improvement of the safety of elevator braking.

In one implementation scenario, the brake protection circuit 10 further includes a voltage sampling circuit (not shown), where an input end of the voltage sampling circuit is electrically connected to an end of the safety circuit 30, so as to sample the voltage of the safety circuit 30, and an output end of the voltage sampling circuit is electrically connected to the voltage input end 11 to transmit the sampled voltage, so that accuracy of sampling the voltage of the end of the safety circuit 30 is improved, and accuracy of the brake protection circuit 10 is improved.

In one specific implementation, the voltage sampling circuit receives the end voltage of the safety loop 30 at a prescribed time and holds the voltage at the output until the next sampling begins. The sampling circuit is typically constructed with an analog switch, a holding capacitor and an in-phase circuit with a unity gain of 1. The sampling operates in one of two states, a sampling state and a holding state. In the sampling state, the switch is turned on, it tracks the level change of the analog input signal as fast as possible until the arrival of the hold signal; in the hold state the switch is opened and the tracking process is stopped, which is always held at the instantaneous value of the input signal before the switch is opened.

In one implementation scenario, the brake protection circuit 10 further includes a voltage follower circuit (not shown), an input end of the voltage follower circuit is electrically connected to an end of the safety circuit 30, and an output end of the voltage follower circuit is electrically connected to an input end of the voltage sampler, so as to buffer an end voltage of the safety circuit 30 and improve safety of the brake protection circuit.

In a specific implementation scenario, the voltage follower circuit is a voltage follower, and is used as a buffer stage and an isolation stage in the brake protection circuit 10, the output impedance of the safety circuit 30 is generally higher, if the input impedance of the subsequent stage is smaller, a considerable part of the signal is lost in the output resistor of the previous stage, and at this time, the voltage follower is required to buffer the signal, so as to play a role in starting up and down, and improve the safety of the brake protection circuit.

Through the structure, the voltage input end 11 of the brake protection circuit 10 is electrically connected with the tail end of the safety circuit 30 to detect the tail end voltage of the safety circuit 30, the tail end voltage can be used for judging whether the current elevator normally operates, the signal output end 12 of the brake protection circuit 10 is triggered by the tail end voltage to generate and output a switching signal, and the switching signal is connected into the elevator brake circuit 20, wherein the signal output end 12 is electrically connected with the enabling end 211 of the brake power supply 21 in the elevator brake circuit 20, or the signal output end 12 is electrically connected with the controlled end 131 of the switching element 13 in the brake protection circuit 10, and the switching element 13 is connected in series in the output circuit of the brake power supply 21, or the switching signal is used for controlling the on and off of the switching element 13, when the elevator does not normally operate, the voltage input end 11 detects the tail end voltage abnormality, and outputs the switching signal for switching off the brake power supply 21 or switching element 13, so that the current loop in the elevator brake circuit 20 is cut off in time, and the transmission speed of the switching signal is higher than the switching signal in the elevator brake circuit 20, or the switching signal is higher than the switching-off speed of the enabling contact 22 in the elevator brake circuit 20, the switching signal is disconnected in the elevator brake circuit 10, the contact is disconnected in the elevator brake circuit is disconnected, the elevator brake circuit is damaged, the situation that the elevator is damaged in the elevator brake is damaged, and the elevator is damaged, and the brake is damaged, and the phenomenon is damaged.

Referring to fig. 3, fig. 3 is a schematic diagram of a frame of an embodiment of an elevator braking system 100 of the present application. The elevator brake system 100 includes a safety circuit 30, an elevator brake circuit 20, and the brake protection circuit 10 described in any of the above embodiments, the safety circuit 30 and the elevator brake circuit 20 being electrically connected to the brake protection circuit 10, respectively. The brake protection circuit 10 is connected with the terminal voltage of the safety circuit 30, is triggered by the terminal voltage to generate a switch signal, controls the on and off of the output circuit of the brake power supply 21 in the brake circuit based on the switch signal, effectively protects the elevator brake circuit 20, and is beneficial to improving the safety of elevator braking.

In one implementation, the elevator braking circuit 20 includes a braking power supply 21, contactor contacts 22, and a band-type brake coil 23 of the traction machine, the contactor contacts 22 and band-type brake coil 23 being connected in series into an output loop of the braking power supply 21. Therefore, when the elevator does not normally run, the voltage input end 11 detects the abnormal end voltage, outputs a switching signal for switching off the braking power supply 21 or switching off the switching element 13, and timely cutting off of a current loop in the elevator braking circuit 20 is realized, and since the transmission speed of the switching signal in the elevator braking circuit 20 is higher than the switching-off speed of the contactor contact 22, when the contactor contact 22 is switched off due to abnormal elevator running, the braking protection circuit 10 cuts off the current loop in the elevator braking circuit 20, so that the phenomenon that the contactor is damaged due to the arcing phenomenon of the contact is reduced as much as possible, the braking distance of the band-type brake coil 23 is not influenced, the elevator braking circuit 20 is effectively protected, and the safety of elevator braking is improved.

Through the above structure, the voltage input end 11 of the brake protection circuit 10 in the elevator brake system 100 is electrically connected with the tail end of the safety circuit 30 to detect the tail end voltage of the safety circuit 30, the tail end voltage can be used for judging whether the current elevator runs normally, the signal output end 12 of the brake protection circuit 10 is triggered by the tail end voltage to generate and output a switch signal, and the switch signal is connected into the elevator brake circuit 20, wherein the signal output end 12 is electrically connected with the enabling end 211 of the brake power supply 21 in the elevator brake circuit 20, or the signal output end 12 is electrically connected with the controlled end 131 of the switch element 13 in the brake protection circuit 10, and the switch signal is used for controlling the on-off of the brake power supply 21, or controlling the on-off of the switch element 13, when the elevator does not run normally, the voltage input end 11 detects the tail end voltage abnormality, and outputs the switch signal for switching off the brake power supply 21 or switching off the switch element 13, so that the current loop in the elevator brake circuit 20 is cut off in time, the transmission speed of the switch signal in the elevator brake circuit 20 is faster than the opening speed of the contactor 22 in the elevator brake circuit 20, or the switching off speed of the contactor 22 in the elevator brake circuit is cut off, the contact point 22 is reduced when the elevator contact is opened, the brake loop is broken, the contact is broken, the situation of the elevator is broken, and the elevator coil is broken, the elevator is broken, and the safety phenomenon is effectively damaged, and the elevator is prevented, and the elevator is damaged, and the braking is in the time.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., a division of circuits or elements, merely a division of logic functions, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical, or other forms.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

Claims (10)

1. A brake protection circuit for use in an elevator brake circuit, the brake protection circuit comprising:

the voltage input end is electrically connected with the tail end of the safety loop so as to detect the tail end voltage of the safety loop;

the signal output end is triggered by the terminal voltage to output a switching signal; the signal output end is electrically connected with an enabling end of a braking power supply in the elevator braking circuit, or is electrically connected with a controlled end of a switching element in the braking protection circuit, and the switching element is connected in series in an output loop of the braking power supply.

2. The brake protection circuit of claim 1, wherein the brake protection circuit comprises an analog-to-digital conversion circuit having an input electrically coupled to the voltage input for analog-to-digital conversion of the terminal voltage, an output electrically coupled to the signal output.

3. The brake protection circuit of claim 2, further comprising a filter circuit having an input electrically coupled to the voltage input and an output electrically coupled to the input of the analog-to-digital conversion circuit.

4. The brake protection circuit of claim 1, wherein the brake protection circuit comprises a transformer, a primary winding of the transformer being electrically connected to the voltage input, and a secondary winding of the transformer being electrically connected to the signal output.

5. The brake protection circuit of claim 1, wherein the brake protection circuit comprises a photo coupler, a light emitting source of the photo coupler is electrically connected to the voltage input terminal, and a light receiver of the photo coupler is electrically connected to the signal output terminal.

6. The brake protection circuit according to claim 1, wherein the switching element includes any one of a MOS transistor, an IGBT, and a triode.

7. The brake protection circuit of claim 1, further comprising a voltage sampling circuit having an input electrically connected to an end of the safety circuit and an output electrically connected to the voltage input.

8. The brake protection circuit of claim 7, further comprising a voltage follower circuit having an input electrically connected to an end of the safety loop and an output electrically connected to an input of the voltage sampling circuit.

9. An elevator brake system comprising a safety circuit, an elevator brake circuit and a brake protection circuit according to any one of claims 1 to 8, the safety circuit and the elevator brake circuit being electrically connected to the brake protection circuit, respectively.

10. The elevator braking system of claim 9, wherein the elevator braking circuit includes a braking power supply, a contactor contact, and a band-type brake coil of the traction machine, the contactor contact and the band-type brake coil being connected in series into an output loop of the braking power supply.