Safety control and detection circuit and method based on dc power control

Abstract

The embodiment of the application relates to the field of circuit detection control, and discloses a safety control and detection circuit and method based on direct-current power supply control, which comprises a power supply part, a control module and a detection module; the control module comprises MOS1, MOS2 and a main control board, the detection module comprises a first relay K1, a second relay K2 and a DC / DC voltage reduction module, the first relay K1 and the second relay K2 are connected in series; the first relay K1 and the second relay K2 are connected with the power supply part and the DC / DC voltage reduction module respectively, the DC / DC voltage reduction module is connected to a first main control input X1 and a second main control input X2 of the main control board, a first output end Y1 of the main control board is connected with a safety loop of an elevator and the detection module, and a second output end Y2 of the main control board is connected with the control module. The circuit structure of the application can quickly respond to emergency events on the direct-current side, reduce electric arc and prolong the service life of devices.

Description

Technical Field

[0001] This application relates to the field of circuit safety detection, and in particular to safety control and detection circuits and methods based on DC power supply control. Background Technology

[0002] In electrical appliances with contacts, the process of connecting and disconnecting current is often accompanied by the generation and extinguishing of an electric arc. An electric arc is a gas discharge phenomenon that poses a certain hazard to electrical appliances. Because alternating current has a current zero-crossing point, the arc is easily broken when the contacts operate. Therefore, the traditional arc extinguishing method uses AC power. However, considering factors such as response time, reliability, power supply failure design, and safety, direct DC control is often necessary, which leads to problems in product cost, size, and lifespan.

[0003] Therefore, there is an urgent need for a method for direct control on the DC side that achieves fast response time, simple failure mode design, high safety, and balances cost, size, and lifespan. Summary of the Invention

[0004] The purpose of this application is to provide a safety control and detection circuit and method based on DC power supply control. The safety control and detection circuit and method based on DC power supply control of this application can achieve the technical effects of fast response time, simple failure mode design, high safety, and consideration of cost, size and lifespan.

[0005] To address the aforementioned technical problems, embodiments of this application provide an active antenna state detection circuit, comprising: a power supply section, a control module, and a detection module;

[0006] The control module includes MOS1, MOS2 and a main control board, and the detection module includes a first relay K1, a second relay K2 and a DC / DC step-down module, wherein the first relay K1 and the second relay K2 are connected in series.

[0007] The first relay K1 and the second relay K2 are respectively connected to the power supply section and the DC / DC step-down module. The DC / DC step-down module is connected to the first main control input X1 and the second main control input X2 of the main control board. The first output terminal Y1 of the main control board is connected to the elevator's safety circuit and the detection module. The second output terminal Y2 of the main control board is connected to the control module. The power supply section is used to convert AC power to DC power and output DC power. The control module is used to control the opening and closing of MOS1 and MOS2 according to the opening and closing status of the second output terminal Y2 of the main control board. The detection module is used to control the opening and closing of the first relay K1 and the second relay K2 according to the opening and closing status of the first output terminal Y1 of the main control board.

[0008] As described above, in the safety control and detection circuit based on DC power supply control, the control module and the detection module are connected to the elevator's brake 1 and brake 2. Brake 1 is connected to K2; when K1, K2, and MOS1 are closed, brake 1 is lifted, and when one of K1, K2, and MOS1 is opened, brake 1 is released. Brake 2 is connected to K1; when K1, K2, and MOS2 are closed, brake 2 is lifted, and when one of K1, K2, and MOS2 is opened, brake 2 is released. After brake 1 and brake 2 are lifted, the elevator starts; after brake 1 and / or brake 2 are released, the elevator stops.

[0009] As described above, in the safety control and detection circuit based on DC power supply control, the DC / DC step-down module is used to convert high-voltage DC power into a low-voltage signal.

[0010] As described above, in the safety control and detection circuit based on DC power supply control, the first relay K1 and / or the second relay K2 are single-pole double-throw relays, with normally open contacts used to control the brake state and normally closed contacts used for relay state detection.

[0011] The safety control and detection circuit based on DC power supply control as described above also includes a freewheeling device, which is used to absorb the coil energy of the brake 1 and the brake 2.

[0012] Embodiments of the present invention also provide a safety control and detection method based on DC power supply control, comprising: a startup phase, first closing the first output terminal Y1 of the main control board, closing the first relay K1 and the second relay K2, delaying for time T1, closing the second output terminal Y2 of the main control board, closing MOS1 and MOS2, and lifting the elevator's brake 1 and brake 2 to complete the startup; a running phase, simultaneously closing the first output terminal Y1 and the second output terminal Y2 of the main control board; a stopping phase, opening the second output terminal Y2 of the main control board, releasing the brake 1 and / or the brake 2, and stopping the elevator; and an emergency stop phase, in the event of a safety circuit disconnection during operation, simultaneously opening the first output terminal Y1 and the second output terminal Y2 of the main control board, releasing the brake 1 and / or the brake 2, and stopping the elevator.

[0013] As described above, the safety control and detection method based on DC power supply control, in the stopping phase, opening the second output terminal Y2 of the main control board, releasing the brake 1 and / or the brake 2, and stopping the elevator operation includes: opening the second output terminal Y2 of the main control board, turning on MOS1 and MOS2; after a delay of T2, opening the first output terminal Y1 of the main control board, turning on the first relay K1 and the second relay K2; releasing the brake 1 and / or the brake 2, and stopping the elevator operation.

[0014] As described above, in the safety control and detection method based on DC power supply control, during the emergency stop phase, if a safety circuit is disconnected during operation, and the first output terminal Y1 and the second output terminal Y2 of the main control board are opened simultaneously, the brake 1 and / or the brake 2 are released. This includes: in an emergency, if the safety circuit is disconnected, the first output terminal Y1 of the main control board is opened, and the first relay K1 and the second relay K2 are disconnected; simultaneously, the second output terminal Y2 of the main control board is opened, and the MOS1 and MOS2 are opened; the brake 1 and / or the brake 2 are released, and the elevator stops running.

[0015] As described above, the safety control and detection method based on DC power supply control further includes the following steps during the stopping phase: after the brake 1 is released, the coil energy of the brake 1 is absorbed through the circuit formed by D1, K1 and K2 to form a freewheeling current; after the brake 2 is released, the coil energy of the brake 2 is absorbed through the circuit formed by D2, K1 and K2 to form a freewheeling current.

[0016] As described above, the safety control and detection method based on DC power supply control further includes the following emergency stop phase: after the brake 1 is released, the coil energy of the brake 1 is rapidly absorbed through the RV1 circuit to complete the elevator stop action; after the brake 2 is released, the coil energy of the brake 2 is rapidly absorbed through the RV2 circuit to complete the elevator stop action.

[0017] In this embodiment, by directly controlling the load with DC, the load power supply can be quickly cut off in an emergency (safety circuit disconnection), achieving rapid shutdown. The K1 / K2 switching contact detection can determine the main circuit continuity. The structure is simple, small in size, and low in cost. The redundant design, using two independent electromechanical devices K1 / K2 connected in series, ensures that even if one device fails, one device can still reliably disconnect the main circuit, guaranteeing safety. In an emergency, when the safety circuit disconnects, K1 / K2 and MOS1 / MOS2 disconnect simultaneously. The disconnection time of the MOS1 / MOS2 semiconductor switching devices is in the microsecond (µs) range, and the disconnection time of the K1 / K2 power relays is in the millisecond (ms) range, ensuring that K1 / K2 does not arc, thus guaranteeing device lifespan. Attached Figure Description

[0018] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments, and unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0019] Figure 1 This is a diagram of the forced-guided contact structure in the prior art of this application;

[0020] Figure 2This is a schematic diagram of a safety control and detection circuit based on DC power supply control provided in one embodiment of this application;

[0021] Figure 3 This is a schematic diagram of a safety control timing based on DC power supply control provided in one embodiment of this application;

[0022] Figure 4 This is a flowchart illustrating a safety control and detection method based on DC power supply control, provided in one embodiment of this application. Detailed Implementation

[0023] In existing technologies, because there is a current zero-crossing point in AC power, the arc is easily broken when the contacts are activated. Therefore, arc extinguishing control is usually performed in AC power. However, AC control cannot cut off the power bus capacitor, and the capacitor continues to discharge.

[0024] In existing technologies, utilizing such Figure 1 The forced-guided contact structure shown has contacts rigidly connected by a mechanical linkage, conforming to a symmetrical contact structure. It can detect adhesion of contact a and construct a safety circuit. Contacts a and b cannot close simultaneously. When contact a is adhered, it ensures that contact b has a gap of more than 0.5mm. The contact action on this linkage is consistent, which can ensure consistency between detection and action and ensure the accuracy of detection. However, the above contact structure is large in size, expensive, and has complex failure modes.

[0025] To address the aforementioned problems, this application proposes a safety control and detection circuit based on DC power supply control, comprising: a power supply section, a control module, and a detection module; the control module includes MOS1, MOS2, and a main control board; the detection module includes a first relay K1, a second relay K2, and a DC / DC step-down module, wherein the first relay K1 and the second relay K2 are connected in series; the first relay K1 and the second relay K2 are respectively connected to the power supply section and the DC / DC step-down module; the DC / DC step-down module is connected to the first main control input X1 and the second main control input X2 of the main control board; the first output terminal Y1 of the main control board is connected to the elevator's safety circuit and the detection module; the second output terminal Y2 of the main control board is connected to the control module; the power supply section is used to convert AC power to DC power and output DC power; the control module is used to control the opening and closing of MOS1 and MOS2 according to the opening and closing status of the second output terminal Y2 of the main control board; the detection module is used to control the opening and closing of the first relay K1 and the second relay K2 according to the opening and closing status of the first output terminal Y1 of the main control board.

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this application to help readers better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the various embodiments below is for the convenience of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.

[0027] refer to Figure 2 The following is a detailed description of the implementation details of the safety control and detection circuit based on DC power supply control in this embodiment. The following content is only for the convenience of understanding and is not necessary for implementing this solution.

[0028] The safety control and detection circuit based on DC power supply control in this embodiment includes: a power supply section, a control module, and a detection module; the control module includes MOS1, MOS2, and a main control board; the detection module includes a first relay K1, a second relay K2, and a DC / DC step-down module, with the first relay K1 and the second relay K2 connected in series; the first relay K1 and the second relay K2 are respectively connected to the power supply section and the DC / DC step-down module; the DC / DC step-down module is connected to the first main control input X1 and the second main control input X2 of the main control board; the first output terminal Y1 of the main control board is connected to the elevator's safety circuit and the detection module; the second output terminal Y2 of the main control board is connected to the control module; the power supply section is used to convert AC power to DC power and output DC power; the control module is used to control the opening and closing of MOS1 and MOS2 according to the opening and closing status of the second output terminal Y2 of the main control board; the detection module is used to control the opening and closing of the first relay K1 and the second relay K2 according to the opening and closing status of the first output terminal Y1 of the main control board.

[0029] The power supply section in this application uses rectifiers, linear power supplies, switching power supplies, or AC / DC power modules, etc. A rectifier is a rectification device, simply put, a device that converts alternating current (AC) into direct current (DC). A rectifier circuit basically consists of a transformer, a main rectifier circuit, a filter capacitor circuit, and a voltage regulator circuit. The transformer reduces the AC voltage to a usable AC voltage. The main rectifier circuit typically uses a bridge rectifier circuit to convert AC to DC. Filtering commonly uses capacitors and inductors to reduce the amplitude of periodically changing current fluctuations. Voltage regulation typically uses a three-terminal regulator to stabilize the voltage at a fixed value, becoming standard DC.

[0030] In the embodiments of this application, the AC power is converted into DC power by the power supply section, and the load is directly controlled on the DC side. This enables the power load to be quickly cut off in an emergency, thus achieving rapid stopping and ensuring elevator safety.

[0031] The elevator brake is a crucial safety device, and its safety and reliability are essential for ensuring safe elevator operation. A bidirectional thrust elevator brake generates bidirectional electromagnetic thrust when energized, disengaging the braking mechanism from the rotating parts of the motor (i.e., releasing it). When power is off, the electromagnetic force disappears, and under the pressure of an external braking spring, a friction brake (hereinafter referred to as the brake) is formed, achieving power-off braking. It is mainly used in conjunction with the drive motor of the escalator traction machine to form an electromagnetic braking three-phase asynchronous motor for escalators, widely applicable in situations requiring smooth stopping, rapid starting, and safe (risk-prevention) braking during power outages.

[0032] In the embodiments of this application, the control module and the detection module are connected to the elevator's brake 1 and brake 2; the specific structure is as follows: Figure 2 As shown,

[0033] In this system, brake 1 is connected to K2, and brake 1, K2, K1, and the current-carrying device D1 form a circuit. After K1, K2, and MOS1 are closed, brake 1 is lifted, and when one of K1, K2, and MOS1 is opened, brake 1 is released. Brake 2 is connected to K1, and brake 2, K1, K2, and the current-carrying device D2 form a circuit. After K1, K2, and MOS2 are closed, brake 2 is lifted, and when one of K1, K2, and MOS2 is opened, brake 2 is released. After both brake 1 and brake 2 are lifted, the elevator starts. After either brake 1 or brake 2 is released, the elevator stops.

[0034] In the embodiments of this application, the continuity of the main circuit can be determined by detecting the contacts of K1 and K2. When the main circuit is disconnected, the detection mode is quickly activated, the failure mode is simple, and the response speed is fast. At the same time, by redundantly setting K1 and K2 relays, it is ensured that if any one device fails, there is still one device that can reliably disconnect the main circuit, thus ensuring elevator safety.

[0035] In embodiments of this application, the DC / DC buck module is used to convert a high-voltage DC power signal into a low-voltage signal.

[0036] like Figure 2As shown, after K1 or K2 is connected to the DC / DC step-down module, the DC / DC step-down module converts the high-voltage DC power into a low-voltage signal for detection by the main control board. The DC / DC step-down module achieves voltage reduction by changing the duty cycle. Through an IC chip, it outputs a square wave signal to control the opening and closing of a switch, thereby controlling the duration of the input voltage's effect on the output. The larger the duty cycle of the square wave signal, the higher the output voltage; the smaller the duty cycle, the lower the output voltage.

[0037] In the embodiments of this application, the first relay K1 and / or the second relay K2 are single-pole double-throw relays, with normally open contacts used to control the brake state and normally closed contacts used for relay state detection.

[0038] A single-pole double-throw (SPDT) relay is used for switching circuits. It consists of a coil, a magnetic circuit system, a contact system, and a base. When current is applied through the coil, the magnetic circuit system generates a magnetic field. This magnetic field causes the contacts to actuate, thereby changing the state of the circuit. In a SPDT relay, a pair of switches operate, connecting or disconnecting one circuit while simultaneously switching the circuit to a switch in the opposite direction. SPDT relays have two states: normally open and normally closed. Normally open refers to the relay's state when it is not energized, i.e., not connected; normally closed refers to the connected state. In this application, the normally open contacts are used to control the brake's state, and the normally closed contacts are used for relay state detection.

[0039] In embodiments of this application, a current-retaining device is also included, which is used to absorb the coil energy of the brake 1 and the brake 2.

[0040] like Figure 2 As shown, D1 is a freewheeling device. After MOS1 is turned off, brake 1 is released, and the coil energy of brake 1 is absorbed through the circuit formed by D1, K1 and K2 to form a freewheeling current. D2 is a freewheeling device. After MOS2 is turned off, brake 2 is released, and the coil energy of brake 2 is absorbed through the circuit formed by D2, K1 and K2 to form a freewheeling current.

[0041] D1 and D2 can be a circuit consisting of an RD resistor and a diode connected in series, or a circuit consisting of an RC resistor and a capacitor connected in series.

[0042] The current-carrying device also includes RV1 and RV2. After the brake 1 is released, the coil energy of the brake 1 is quickly absorbed through the RV1 circuit to complete the elevator stopping action; in another case, after the brake 2 is released, the coil energy of the brake 2 is quickly absorbed through the RV2 circuit to complete the elevator stopping action.

[0043] In the embodiments of this application, the elevator control timing diagram is referenced. Figure 3As shown.

[0044] In the embodiments of this application, during the elevator startup phase, the first output terminal Y1 of the main control board is first closed, the detection module closes the first relay K1 and the second relay K2, and after a delay of T1, the second output terminal Y2 of the main control board is closed. The control module closes MOS1 and MOS2, and the elevator brakes 1 and 2 are lifted, completing the startup. The delay of T1 ensures that the contact switching of the first relay K1 and the second relay K2 is performed with zero current, ensuring the safety of the first relay and the second relay and extending the service life of the devices.

[0045] In the embodiments of this application, during the elevator's stopping phase, the second output terminal Y2 of the main control board is opened, the control module activates MOS1 and MOS2, and after a delay of T2, the first output terminal Y1 of the main control board is opened. The detection module activates the first relay K1 and the second relay K2, brake 1 and / or brake 2 are released, and the elevator stops running. Because MOS1 and MOS2 are disconnected in advance, and the first relay K1 and the second relay K2 are opened after a delay of T2, it is ensured that the contacts of the first relay K1 and the second relay K2 are in a zero-current mode when switching, thus extending the service life of the devices.

[0046] T1 and T2 are determined based on the device's action delay time, while also taking into account the loop absorption time. They are generally 10-1000ms, but their specific values ​​are not limited here.

[0047] In an embodiment of this application, when an emergency occurs in the elevator, the safety circuit is disconnected, the first output terminal Y1 of the main control board is opened, the first relay K1 and the second relay K2 are disconnected, the second output terminal Y2 of the main control board is opened at the same time, the MOS1 and the MOS2 are opened, the brake 1 and / or the brake 2 are released, and the elevator stops running.

[0048] Because MOS1 / MOS2 switches rapidly, the safety circuit disconnects in an emergency, and K1 / K2 and MOS1 / MOS2 disconnect simultaneously. The disconnection time of the MOS1 / MOS2 semiconductor switching devices is in the microsecond range, and the disconnection time of the K1 / K2 power relays is in the millisecond range, which can ensure that K1 / K2 does not arc, thereby ensuring the device lifespan.

[0049] In the embodiments of this application, by directly controlling the load with DC, the load power supply can be quickly cut off in an emergency (safety circuit disconnection), achieving rapid shutdown. The continuity of the main circuit can be determined using the K1 / K2 switching contact detection. The structure is simple, small in size, and low in cost. The redundant design, using two independent electromechanical devices K1 / K2 connected in series, ensures that even if one device fails, one device can still reliably disconnect the main circuit, guaranteeing safety. In an emergency, when the safety circuit disconnects, K1 / K2 and MOS1 / MOS2 disconnect simultaneously. The disconnection time of the MOS1 / MOS2 semiconductor switching devices is in the microsecond (µs) range, and the disconnection time of the K1 / K2 power relays is in the millisecond (ms) range, ensuring that K1 / K2 does not arc, thereby guaranteeing device lifespan.

[0050] It is worth mentioning that all units involved in this embodiment are logical units. In practical applications, a logical unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. Furthermore, to highlight the innovative aspects of this invention, this embodiment does not introduce units that are not closely related to solving the technical problem proposed by this invention; however, this does not mean that other units are absent from this embodiment.

[0051] Furthermore, the examples mentioned in the above embodiments can be freely combined, and any combination can be understood as an embodiment. The terms "embodiment" or "example" appearing in various locations in the specification do not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand that the embodiments described herein can be combined with other embodiments.

[0052] Another embodiment of the present invention relates to a safety control and detection method based on DC power supply control, applied to the aforementioned safety control and detection circuit based on DC power supply control, see reference. Figure 4 The process of safety control and detection methods based on DC power supply control includes:

[0053] Step S41, the start-up phase: First, close the first output terminal Y1 of the main control board, then close the first relay K1 and the second relay K2. After a delay of T1, close the second output terminal Y2 of the main control board, then close MOS1 and MOS2. The elevator's brakes 1 and 2 are then lifted, completing the start-up.

[0054] In the embodiments of this application, during the elevator startup phase, the first output terminal Y1 of the main control board is first closed, the detection module closes the first relay K1 and the second relay K2, and after a delay of T1, the second output terminal Y2 of the main control board is closed. The control module closes MOS1 and MOS2, and the elevator brakes 1 and 2 are lifted, completing the startup. The delay of T1 ensures that the contact switching of the first relay K1 and the second relay K2 is performed with zero current, ensuring the safety of the first relay and the second relay and extending the service life of the devices.

[0055] Step S42, during the operation phase, simultaneously close the first output terminal Y1 and the second output terminal Y2 of the main control board.

[0056] Step S43, Stopping Phase: Open the second output terminal Y2 of the main control board, release the brake 1 and / or the brake 2, and the elevator stops running.

[0057] During the stopping phase, opening the second output terminal Y2 of the main control board and releasing the brake 1 and / or the brake 2 to stop the elevator includes: opening the second output terminal Y2 of the main control board, turning on MOS1 and MOS2; after a delay of T2, opening the first output terminal Y1 of the main control board, turning on the first relay K1 and the second relay K2; releasing the brake 1 and / or the brake 2, and stopping the elevator.

[0058] T1 and T2 are determined based on the device's action delay time, while also taking into account the loop absorption time. They are generally 10-1000ms, but their specific values ​​are not limited here.

[0059] The stopping phase also includes: after the brake 1 is released, the coil energy of the brake 1 is absorbed through the circuit formed by D1, K1 and K2 to form a freewheeling current; after the brake 2 is released, the coil energy of the brake 2 is absorbed through the circuit formed by D2, K1 and K2 to form a freewheeling current.

[0060] Step S44, emergency stop phase: If the safety circuit is disconnected during operation, the first output terminal Y1 and the second output terminal Y2 of the main control board are opened simultaneously, the brake 1 and / or the brake 2 are released, and the elevator stops running.

[0061] In an embodiment of this application, when an emergency occurs in the elevator, the safety circuit is disconnected, the first output terminal Y1 of the main control board is opened, the first relay K1 and the second relay K2 are disconnected, the second output terminal Y2 of the main control board is opened at the same time, the MOS1 and the MOS2 are opened, the brake 1 and / or the brake 2 are released, and the elevator stops running.

[0062] The emergency stop phase also includes: after the brake 1 is released, the coil energy of the brake 1 is quickly absorbed through the RV1 circuit to complete the elevator stop action; after the brake 2 is released, the coil energy of the brake 2 is quickly absorbed through the RV2 circuit to complete the elevator stop action.

[0063] In this embodiment, by directly controlling the load with DC, the load power supply can be quickly cut off in an emergency (safety circuit disconnection), achieving rapid shutdown. The K1 / K2 switching contact detection can determine the main circuit continuity. The structure is simple, small in size, and low in cost. The redundant design, using two independent electromechanical devices K1 / K2 connected in series, ensures that even if one device fails, one device can still reliably disconnect the main circuit, guaranteeing safety. In an emergency, when the safety circuit disconnects, K1 / K2 and MOS1 / MOS2 disconnect simultaneously. The disconnection time of the MOS1 / MOS2 semiconductor switching devices is in the microsecond (µs) range, and the disconnection time of the K1 / K2 power relays is in the millisecond (ms) range, ensuring that K1 / K2 does not arc, thus guaranteeing device lifespan.

[0064] The various steps described above are only for clarity. In practice, they can be combined into one step or some steps can be broken down into multiple steps. As long as they include the same logical relationship, they are all within the scope of protection of this patent. Adding insignificant modifications or introducing insignificant designs to the process, but without changing the core design of the process, are also within the scope of protection of this patent.

[0065] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing this application, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of this application.

Claims

1. A safety control and detection circuit based on DC power supply control, characterized in that, include: Power supply section, control module, and detection module; The control module includes MOS1, MOS2 and a main control board, and the detection module includes a first relay K1, a second relay K2 and a DC / DC step-down module, wherein the first relay K1 and the second relay K2 are connected in series. The first relay K1 and the second relay K2 are respectively connected to the power supply section and the DC / DC step-down module. The DC / DC step-down module is connected to the first main control input X1 and the second main control input X2 of the main control board. The first output terminal Y1 of the main control board is connected to the elevator's safety circuit and the detection module. The second output terminal Y2 of the main control board is connected to the control module. The power supply section is used to convert AC power into DC power and output DC power. The control module is used to control the opening and closing of MOS1 and MOS2 according to the opening and closing status of the second output terminal Y2 of the main control board; The detection module is used to control the opening and closing of the first relay K1 and the second relay K2 according to the opening and closing status of the first output terminal Y1 of the main control board.

2. The safety control and detection circuit based on DC power supply control according to claim 1, characterized in that, The control module and the detection module are connected to the elevator's brake 1 and brake 2; Brake 1 is connected to K2. When K1, K2 and MOS1 are closed, brake 1 is lifted and one of the components of K1, K2 and MOS1 is opened, thus releasing brake 1. Brake 2 is connected to K1. After K1, K2 and MOS2 are closed, brake 2 is lifted. When one of K1, K2 and MOS2 is opened, brake 2 is released. After brake 1 and brake 2 are lifted, the elevator starts; The elevator stops after brake 1 and / or brake 2 are released.

3. The safety control and detection circuit based on DC power supply control according to claim 1, characterized in that, The DC / DC step-down module is used to convert high-voltage DC power into a low-voltage signal.

4. The safety control and detection circuit based on DC power supply control according to claim 1, characterized in that, The first relay K1 and / or the second relay K2 are single-pole double-throw relays, with normally open contacts used to control the brake state and normally closed contacts used for relay state detection.

5. The safety control and detection circuit based on DC power supply control according to claim 1, characterized in that, It also includes a current-retaining device for absorbing the coil energy of the brake 1 and the brake 2.

6. A safety control and detection method based on DC power supply control, applied to the circuit as described in any one of claims 1-5, characterized in that, include: During the startup phase, the first output terminal Y1 of the main control board is closed, the first relay K1 and the second relay K2 are closed, and after a delay of T1 time, the second output terminal Y2 of the main control board is closed, MOS1 and MOS2 are closed, and the elevator's brakes 1 and 2 are lifted, completing the startup. During operation, the first output terminal Y1 and the second output terminal Y2 of the main control board are closed simultaneously. During the stopping phase, the second output terminal Y2 of the main control board is opened, the brake 1 and / or the brake 2 are released, and the elevator stops running; During the emergency stop phase, if the safety circuit is disconnected during operation, the first output terminal Y1 and the second output terminal Y2 of the main control board will be opened simultaneously, the brake 1 and / or the brake 2 will be released, and the elevator will stop running.

7. The safety control and detection method based on DC power supply control according to claim 6, characterized in that, During the stopping phase, opening the second output terminal Y2 of the main control board releases brake 1 and / or brake 2, causing the elevator to stop operating. Turn on the second output terminal Y2 of the main control board; MOS1 and MOS2 will then be turned on. After a delay of T2, the first output terminal Y1 of the main control board is opened, and the first relay K1 and the second relay K2 are turned on. Brake 1 and / or brake 2 are released, and the elevator stops running.

8. The safety control and detection method based on DC power supply control according to claim 6, characterized in that, During the emergency stop phase, if a safety circuit disconnects during operation, and simultaneously the first output terminal Y1 and the second output terminal Y2 of the main control board are opened, the brake 1 and / or the brake 2 are released, including: In an emergency, the safety circuit is disconnected, opening the first output terminal Y1 of the main control board disconnects the first relay K1 and the second relay K2. Simultaneously, the second output terminal Y2 of the main control board is turned on, and MOS1 and MOS2 are turned on; When brake 1 and / or brake 2 are released, the elevator stops running.

9. The safety control and detection method based on DC power supply control according to claim 6, characterized in that, The stopping phase also includes; After the brake 1 is released, the coil energy of the brake 1 is absorbed through the circuit formed by D1, K1 and K2, forming a freewheeling current; After the brake 2 is released, the coil energy of the brake 2 is absorbed through the circuit formed by D2, K1 and K2, forming a freewheeling current.

10. The safety control and detection method based on DC power supply control according to claim 6, characterized in that, The emergency stop phase also includes: After the brake 1 is released, the coil energy of the brake 1 is quickly absorbed through the RV1 circuit, completing the elevator stop action; After the brake 2 is released, the coil energy of the brake 2 is quickly absorbed through the RV2 circuit, completing the elevator stopping action.

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