Elevator car weighing device based on floor position

Abstract

The utility model discloses an elevator car weighing device based on a floor position, which relates to the field of elevator car weighing and comprises a weighing controller used for analyzing a real-time weight signal processed by a weighing module according to a car empty weight reference value corresponding to a floor position signal, and sending the real-time weight signal to the weighing module when an elevator is overloaded; the overload prompting module is controlled to be turned on, and an overload signal is sent to an elevator main controller; the monostable switches are installed on a straight beam of the elevator car and used for forming a state combination of absolute position information of the corresponding floor based on the on-off state of each switch; the magnetic bean assemblies are installed at the elevator car leveling positions corresponding to all the floors along the elevator guide rails, and the number of the magnetic bean sets in the magnetic bean assemblies corresponding to all the floors and the installation positions of the magnetic bean sets are determined according to the state combination corresponding to the floors; the problems that the prior art depends on floor signals provided by an encoder or a master control system and is easily affected by electromagnetic interference or mechanical wear are solved.

Description

Technical Field

[0001] This utility model relates to the field of elevator car weighing, and in particular to an elevator car weighing device based on floor location. Background Technology

[0002] Existing technologies largely rely on floor signals provided by encoders or main control systems for overload detection. However, these signals have significant drawbacks: First, floor signals from encoders or main control systems are susceptible to electromagnetic interference or mechanical wear and cannot independently verify the accuracy of floor positions, resulting in insufficient reliability of overload detection. Second, traditional overload warning modules (such as relays + indicator lights) often experience false triggering due to short circuits or interference in the signal transmission path, and lack physical isolation design, making them prone to damaging the controller. These problems limit the reliability and applicability of traditional elevator weighing devices. Utility Model Content

[0003] To address at least one of the aforementioned technical problems, this utility model proposes an elevator car weighing device based on floor location, comprising:

[0004] The weighing module is used to acquire and process the real-time weight signal of the elevator car;

[0005] The overload warning module is used to issue an overload warning signal when an overload is detected.

[0006] The weighing controller is connected to the weighing module and the overload warning module. It is used to receive the floor position signal, analyze the real-time weight signal processed by the weighing module based on the car empty weight reference value corresponding to the floor position signal, and control the overload warning module to light up and send an overload signal to the elevator main controller when overloaded.

[0007] Multiple monostable switches are installed on the elevator car beam. The number of these switches is determined by the total number of target floors. They are used to form a combination of absolute position information for each floor based on the opening and closing state of each switch.

[0008] The magnetic bead assembly is installed along the elevator guide rail at the leveling position of the elevator car corresponding to each floor. The magnetic bead assembly includes at least one magnetic bead group, and the number of magnetic bead groups in the magnetic bead assembly corresponding to each floor and the installation position of the magnetic bead groups are determined according to the state combination corresponding to that floor.

[0009] The floor position signal is generated by each monostable switch and magnetic bead assembly.

[0010] Furthermore, the weighing module includes:

[0011] A weighing sensor is used to collect the real-time weight signal of the elevator car; the real-time weight signal is a voltage signal.

[0012] The AD conversion chip U1 is used to convert the real-time weight signal collected by the weighing sensor into a digital signal and output it to the weighing controller.

[0013] Furthermore, the elevator car weighing device also includes:

[0014] The position signal access module is connected to each monostable switch and is used to collect the opening and closing status signals of each monostable switch and transmit the signals to the weighing controller so that the weighing controller can analyze the absolute position of the current floor; the opening and closing status signals of each monostable switch form a state combination, i.e., the floor position signal.

[0015] Furthermore, the location signal access module includes:

[0016] Multiple position signal access units are connected one-to-one with the monostable switch to collect the opening and closing status signals of the corresponding monostable switch and transmit them to the weighing controller.

[0017] Furthermore, the location signal access module also includes:

[0018] Multiple pull-up resistors are connected one-to-one with the position signal access unit to enhance the anti-interference capability of the position signal access unit output.

[0019] Furthermore, the location signal access unit includes:

[0020] Current-limiting resistor and optocoupler; where:

[0021] One end of the current-limiting resistor is connected to the corresponding monostable switch, and the other end is connected to the negative terminal of the LED in the optocoupler; the positive terminal of the LED in the optocoupler is connected to a 24V power supply; the emitter of the phototransistor in the optocoupler is grounded, and the collector is connected to one end of the corresponding pull-up resistor and then connected to the weighing controller; the other end of the pull-up resistor is connected to a +5V power supply.

[0022] Furthermore, the overload warning module includes:

[0023] An amplifier, whose input is connected to the weighing controller, is used to receive and amplify the overload control signal;

[0024] The relay includes a coil and a normally open contact; one end of the coil is connected to the output of an amplifier, and the other end is connected to a +5V power supply; the two terminals of the normally open contact are respectively connected to the overload signal input terminals (KY1 and M1) of the external elevator main controller.

[0025] When the weighing controller detects an overload, it sends an overload control signal to the amplifier, energizing the relay coil and closing the normally open contact, thereby outputting the overload signal to the elevator main controller.

[0026] Furthermore, the overload warning module also includes:

[0027] An indicator unit, connected to the relay, is used to illuminate the indicator light when the normally open contact is closed.

[0028] Furthermore, the amplifier includes:

[0029] The twelfth resistor R12 is connected to the transistor Q1; one end of the twelfth resistor R12 is connected to the weighing controller, and the other end is connected to the base of the transistor Q1; the emitter of the transistor Q1 is grounded, and the collector is connected to one end of the coil in the relay.

[0030] Furthermore, the indicating unit includes:

[0031] The eleventh resistor R11, the first diode D1, and the indicator light LED1; where:

[0032] One end of the eleventh resistor R11 is connected in sequence to the positive terminal of the first diode D1 and one end of the coil in the relay, and the other end is connected to the negative terminal of the indicator LED1; the positive terminal of the indicator LED1 is connected in sequence to the negative terminal of the first diode D1 and the other end of the coil in the relay.

[0033] Compared with the prior art, the present invention has at least the following beneficial effects:

[0034] (1) The elevator car weighing device proposed in this utility model includes: a weighing controller, used to receive floor position signals, and analyze the real-time weight signal processed by the weighing module according to the car empty weight benchmark value corresponding to the floor position signal, and control the overload warning module to light up and send an overload signal to the elevator main controller when the elevator is overloaded; multiple monostable switches, installed on the straight beam of the elevator car, the number of which is determined according to the total number of target floors, used to form a state combination of the absolute position information of the corresponding floor based on the opening and closing state of each switch; a magnetic bead assembly, installed along the elevator guide rail at the elevator car leveling position corresponding to each floor, the magnetic bead assembly includes at least one magnetic bead group, and the number of magnetic bead groups in the magnetic bead assembly corresponding to each floor and the installation position of the magnetic bead groups are determined according to the state combination corresponding to that floor; the floor position signal is generated by each monostable switch and the magnetic bead assembly; it solves the problems of existing technologies that rely on the floor signals provided by encoders or main control systems and are easily affected by electromagnetic interference or mechanical wear.

[0035] (2) The position signal access module of this utility model achieves electrical isolation between input and output through an optocoupler, effectively blocking external electromagnetic interference from intruding into the weighing controller, and significantly improving the anti-interference capability and safety of the device. Simultaneously, the pull-up resistor configured in the module maintains a stable signal level when the monostable switch is not triggered, avoiding false triggering caused by signal drift. Furthermore, the current-limiting resistor is designed to limit the current flowing through the LED in the optocoupler, preventing overcurrent damage to the LED components, thereby extending the service life of the hardware and ensuring the reliability of signal transmission.

[0036] (3) In the overload warning module, transistor Q1 acts as the core signal amplifier. It receives the control signal from the weighing controller through its base and amplifies the signal power to drive the coil of relay K1. This design ensures that the relay coil can obtain sufficient drive current, thereby stably triggering the closing action of the normally open contact and realizing the reliable output of the overload signal. Through the amplification function of the transistor, the device can still maintain the timeliness and accuracy of response when dealing with high load demands, avoiding action delay or failure due to signal weakening.

[0037] (4) The indicator unit of this utility model absorbs the reverse electromotive force when the relay K1 coil is disconnected through diode D1, effectively suppressing the damage of transient voltage spikes to circuit components (such as transistor Q1 or weighing controller) and extending the overall life of the device. At the same time, the indicator LED1 is lit by current limiting through resistor R11 when the overload signal is triggered, providing users with intuitive visual prompts and enhancing users' safety perception of the overload state. Attached Figure Description

[0038] Figure 1 This is a circuit diagram of an elevator car weighing device based on floor location;

[0039] Figure 2 This is a schematic diagram showing the installation positions of the monostable switch and the magnetic bead assembly.

[0040] In the picture:

[0041] 1. Magnetic bead assembly; 2. Monostable switch; 3. Elevator guide rail; 4. Elevator car straight beam. Detailed Implementation

[0042] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0043] To address the problem that existing technologies often rely on floor signals provided by encoders or main control systems, which are susceptible to electromagnetic interference or mechanical wear, this invention proposes an elevator car weighing device based on floor location, comprising:

[0044] The weighing module is used to acquire and process the real-time weight signal of the elevator car;

[0045] The weighing module includes:

[0046] A weighing sensor is used to collect the real-time weight signal of the elevator car; the real-time weight signal is a voltage signal.

[0047] The AD conversion chip U1 is used to convert the real-time weight signal collected by the weighing sensor into a digital signal and output it to the weighing controller.

[0048] The weighing controller MCU is connected to the weighing module and the overload warning module. It is used to receive the floor position signal, analyze the real-time weight signal processed by the weighing module based on the car empty weight reference value corresponding to the floor position signal, and control the overload warning module to light up and send an overload signal to the elevator main controller when overloaded.

[0049] Multiple monostable switches 2 are installed on the elevator car straight beam 4. The number of them is determined according to the total number of target floors. They are used to form a state combination of the absolute position information of the corresponding floor based on the opening and closing state of each switch.

[0050] The magnetic bead assembly is installed along the elevator guide rail 3 at the leveling position of the elevator car corresponding to each floor. The magnetic bead assembly includes at least one magnetic bead group 1, and the number of magnetic bead groups in the magnetic bead assembly corresponding to each floor and the installation position of the magnetic bead group 1 are determined according to the state combination corresponding to that floor.

[0051] The floor position signal is generated by each monostable switch 2 and the magnetic bead assembly.

[0052] The elevator car weighing device also includes:

[0053] The position signal access module is connected to each monostable switch 2 and is used to collect the opening and closing state signals of each monostable switch 2 and transmit the signals to the weighing controller so that the weighing controller can analyze the absolute position of the current floor; the opening and closing state signals of each monostable switch 2 form a state combination, i.e., the floor position signal.

[0054] like Figure 1 As shown:

[0055] The location signal access module includes:

[0056] Multiple position signal access units are connected one-to-one with the monostable switch 2 to collect the opening and closing state signals of the corresponding monostable switch 2 and transmit them to the weighing controller.

[0057] The location signal access module further includes:

[0058] Multiple pull-up resistors (R6 to R10) are connected one-to-one with the position signal access unit to enhance the anti-interference capability of the position signal access unit output.

[0059] The location signal access unit includes:

[0060] Current-limiting resistor and optocoupler; where:

[0061] One end of the current-limiting resistor is connected to the corresponding monostable switch 2, and the other end is connected to the negative terminal of the LED in the optocoupler; the positive terminal of the LED in the optocoupler is connected to a 24V power supply; the emitter of the phototransistor in the optocoupler is grounded, and the collector is connected to one end of the corresponding pull-up resistor and then connected to the weighing controller; the other end of the pull-up resistor is connected to a +5V power supply.

[0062] Figure 1 In this context, the current-limiting resistor R1 and the optocoupler PC1 together represent a position signal access unit.

[0063] This utility model's position signal access module achieves electrical isolation between input and output through an optocoupler, effectively blocking external electromagnetic interference from intruding into the weighing controller and significantly improving the device's anti-interference capability and safety. Simultaneously, the pull-up resistor configured in the module maintains a stable signal level when the monostable switch is not triggered, avoiding false triggering caused by signal drift. Furthermore, a current-limiting resistor is designed to limit the current flowing through the LED in the optocoupler, preventing overcurrent damage to the LED components, thereby extending the hardware's lifespan and ensuring the reliability of signal transmission.

[0064] The overload warning module is used to issue an overload warning signal when an overload is detected.

[0065] The overload warning module includes:

[0066] An amplifier, whose input is connected to the weighing controller, is used to receive and amplify the overload control signal;

[0067] The amplifier includes:

[0068] The twelfth resistor R12 is connected to the transistor Q1; one end of the twelfth resistor R12 is connected to the weighing controller, and the other end is connected to the base of the transistor Q1; the emitter of the transistor Q1 is grounded, and the collector is connected to one end of the coil in the relay.

[0069] Relay K1 includes a coil and a normally open contact; one end of the coil is connected to the output of an amplifier, and the other end is connected to a +5V power supply; the two terminals of the normally open contact are respectively connected to the overload signal input terminals (KY1 and M1) of the external elevator main controller.

[0070] When the weighing controller MCU detects an overload, it sends an overload control signal to the amplifier, energizing the coil of relay K1 and closing its normally open contact, thereby outputting the overload signal to the elevator main controller.

[0071] In the overload warning module, transistor Q1 acts as the core signal amplifier. It receives the control signal from the weighing controller through its base and amplifies the signal power to drive the coil of relay K1. This design ensures that the relay coil receives sufficient drive current to stably trigger the closing action of the normally open contacts, achieving reliable output of the overload signal. Through the transistor's amplification function, the device maintains timely and accurate response even under high load demands, avoiding delays or failures caused by signal weakening.

[0072] The overload warning module also includes:

[0073] The indicator unit, connected to the relay K1, is used to illuminate the indicator light when the normally open contact is closed.

[0074] The indicating unit includes:

[0075] The eleventh resistor R11, the first diode D1, and the indicator light LED1; where:

[0076] One end of the eleventh resistor R11 is connected in sequence to the positive terminal of the first diode D1 and one end of the coil in the relay, and the other end is connected to the negative terminal of the indicator LED1; the positive terminal of the indicator LED1 is connected in sequence to the negative terminal of the first diode D1 and the other end of the coil in the relay.

[0077] The indicator unit of this invention absorbs the reverse electromotive force when the relay K1 coil is disconnected via diode D1, effectively suppressing damage to circuit components (such as transistor Q1 or the weighing controller) from transient voltage spikes and extending the overall lifespan of the device. Simultaneously, indicator LED1 illuminates through current-limiting resistor R11 when an overload signal is triggered, providing users with an intuitive visual cue and enhancing their safety awareness of overload conditions. Specifically, this design solves the problems in the prior art through the following methods:

[0078] Diode D1 absorbs the reverse electromotive force of the coil, reducing the risk of circuit false triggering;

[0079] The current-limiting resistor R11 of LED1 is combined with the reverse electromotive force protection of the relay coil to form a dual protection mechanism, avoiding false triggering of traditional relay + indicator light devices due to signal short circuit or interference.

[0080] The following example illustrates the combinations of on / off states using five monostable switches (A, B, C, D, E):

[0081] Table 1 (This embodiment shows the combinations of open and closed states for layers 1 to 4):

[0082]

[0083] In this embodiment, as Figure 2 As shown, five monostable switches (A, B, C, D, and E) are installed on the straight beam of the elevator car, with evenly spaced intervals (20mm in this embodiment). Each switch has a built-in passive reed switch contact, allowing it to operate without external power supply.

[0084] Each switch corresponds to a binary bit, and the 5 switches can be combined to generate 32 unique on / off states (2⁵ = 32), covering the needs of a 31-story building. In Table 1, ON represents 1 (switch signal valid), and empty represents 0 (switch signal invalid); the weighing controller defines a unique combination of on / off states for each floor.

[0085] The magnetic bead assemblies are installed along the elevator guide rail 3 (i.e., the car guide rail) at the corresponding car leveling position on each floor. The number and installation position of each magnetic bead assembly 1 are determined according to the binary code of the corresponding floor. Specifically: 1-5 magnetic bead assemblies 1 are installed at each leveling position. The number and position are designed according to the floor code. For example, the first floor code 00001 → only triggers switch A (therefore, in this floor, magnetic bead assembly 1 is installed along the elevator guide rail 3 at the leveling position and aligned with the position of switch A, so that switch A is triggered when the car runs to this floor). The second floor code 00010 → triggers switch B (therefore, in this floor, magnetic bead assembly 1 is aligned with the position of switch B, so that switch B is triggered when the car runs to this floor). The third floor code 00011 → triggers switches A and B (therefore, in this floor, two magnetic bead assemblies 1 are provided, and the two magnetic bead assemblies 1 are aligned with the positions of switches A and B respectively, so that switches A and B are triggered when the car runs to this floor).

[0086] When the car reaches a certain floor, the magnetic bead group 1 triggers the reed switch contact of the corresponding monostable switch 2 to close, forming an open / closed state combination signal (e.g., the code for the 3rd floor is 00011, which triggers switches A and B).

[0087] Each monostable switch 2 is connected to the LED terminal of the optocoupler via a current-limiting resistor (e.g., powered by a 24V power supply). The output signal of the phototransistor is transmitted to the weighing controller via a pull-up resistor (+5V). The optocoupler provides electrical isolation, blocking external interference; the pull-up resistor maintains a high-level signal when not triggered, preventing drift that could lead to false triggering.

[0088] The weighing controller receives the opening and closing status signal (e.g., 00011 → 3rd floor) and analyzes the absolute position of the current floor (3rd floor). Combined with the pre-stored car empty load weight reference value table, it obtains the car empty load weight reference value for the current floor. Then, it subtracts the car empty load weight reference value from the processed real-time weight signal to obtain the actual weight value of the car load. When the actual weight value of the car load exceeds the elevator's set rated load, the controller sends an overload control signal to the overload warning module.

[0089] The transistor Q1 amplifies the overload signal from the controller, energizing the coil of relay K1. The normally open contact closes, transmitting the overload signal to the elevator main controller.

[0090] Diode D1 absorbs the reverse electromotive force when the relay coil is disconnected, protecting the circuit components; LED1 illuminates to provide a visual indication.

[0091] It should be explained that the table of reference values ​​for the empty car weight mentioned in this embodiment can be obtained through existing patent application (application number: 202110525576X), which includes the reference value for the empty car weight for each floor.

[0092] The elevator car weighing device proposed in this utility model includes: a weighing controller, used to receive floor position signals, and analyze the real-time weight signal processed by the weighing module based on the car empty load weight benchmark value corresponding to the floor position signal, and control the overload warning module to light up and send an overload signal to the elevator main controller when the elevator is overloaded; multiple monostable switches, installed on the straight beam of the elevator car, the number of which is determined according to the total number of target floors, used to form a state combination of the absolute position information of the corresponding floor based on the opening and closing state of each switch; magnetic bead assembly, installed along the elevator guide rail at the elevator car leveling position corresponding to each floor, the magnetic bead assembly includes at least one magnetic bead group, and the number of magnetic bead groups in the magnetic bead assembly corresponding to each floor and the installation position of the magnetic bead groups are determined according to the state combination corresponding to that floor; the floor position signal is generated by each monostable switch and the magnetic bead assembly; this solves the problems of existing technologies that rely heavily on floor signals provided by encoders or main control systems and are easily affected by electromagnetic interference or mechanical wear.

[0093] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0094] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0095] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0096] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. An elevator car weighing device based on floor location, characterized in that, include: The weighing module is used to acquire and process the real-time weight signal of the elevator car; The overload warning module is used to issue an overload warning signal when an overload is detected. The weighing controller is connected to the weighing module and the overload warning module. It is used to receive the floor position signal, analyze the real-time weight signal processed by the weighing module based on the car empty weight reference value corresponding to the floor position signal, and control the overload warning module to light up and send an overload signal to the elevator main controller when overloaded. Multiple monostable switches are installed on the elevator car beam. The number of these switches is determined by the total number of target floors. They are used to form a combination of absolute position information for each floor based on the opening and closing state of each switch. The magnetic bead assembly is installed along the elevator guide rail at the leveling position of the elevator car corresponding to each floor. The magnetic bead assembly includes at least one magnetic bead group, and the number of magnetic bead groups in the magnetic bead assembly corresponding to each floor and the installation position of the magnetic bead groups are determined according to the state combination corresponding to that floor. The floor position signal is generated by each monostable switch and magnetic bead assembly.

2. The elevator car weighing device based on floor location according to claim 1, characterized in that, The weighing module includes: A weighing sensor is used to collect the real-time weight signal of the elevator car; the real-time weight signal is a voltage signal. The AD conversion chip U1 is used to convert the real-time weight signal collected by the weighing sensor into a digital signal and output it to the weighing controller.

3. The elevator car weighing device based on floor location according to claim 1, characterized in that, The elevator car weighing device also includes: The position signal access module is connected to each monostable switch and is used to collect the opening and closing status signals of each monostable switch and transmit the signals to the weighing controller so that the weighing controller can analyze the absolute position of the current floor; the opening and closing status signals of each monostable switch form a state combination, i.e., the floor position signal.

4. The elevator car weighing device based on floor location according to claim 3, characterized in that, The location signal access module includes: Multiple position signal access units are connected one-to-one with the monostable switch to collect the opening and closing status signals of the corresponding monostable switch and transmit them to the weighing controller.

5. The elevator car weighing device based on floor location according to claim 4, characterized in that, The location signal access module further includes: Multiple pull-up resistors are connected one-to-one with the position signal access unit to enhance the anti-interference capability of the position signal access unit output.

6. The elevator car weighing device based on floor location according to claim 5, characterized in that, The location signal access unit includes: Current-limiting resistor and optocoupler; where: One end of the current-limiting resistor is connected to the corresponding monostable switch, and the other end is connected to the negative terminal of the LED in the optocoupler; the positive terminal of the LED in the optocoupler is connected to a 24V power supply; the emitter of the phototransistor in the optocoupler is grounded, and the collector is connected to one end of the corresponding pull-up resistor and then connected to the weighing controller; the other end of the pull-up resistor is connected to a +5V power supply.

7. The elevator car weighing device based on floor location according to claim 1, characterized in that, The overload warning module includes: An amplifier, whose input is connected to the weighing controller, is used to receive and amplify the overload control signal; The relay includes a coil and a normally open contact; one end of the coil is connected to the output of an amplifier, and the other end is connected to a +5V power supply; the two terminals of the normally open contact are respectively connected to the overload signal input terminal of an external elevator main controller. When the weighing controller detects an overload, it sends an overload control signal to the amplifier, energizing the relay coil and closing the normally open contact, thereby outputting the overload signal to the elevator main controller.

8. The elevator car weighing device based on floor location according to claim 7, characterized in that, The overload warning module also includes: An indicator unit, connected to the relay, is used to illuminate the indicator light when the normally open contact is closed.

9. The elevator car weighing device based on floor location according to claim 8, characterized in that, The amplifier includes: The twelfth resistor R12 is connected to the transistor Q1; one end of the twelfth resistor R12 is connected to the weighing controller, and the other end is connected to the base of the transistor Q1; the emitter of the transistor Q1 is grounded, and the collector is connected to one end of the coil in the relay.

10. An elevator car weighing device based on floor location according to claim 9, characterized in that, The indicating unit includes: The eleventh resistor R11, the first diode D1, and the indicator light LED1; where: One end of the eleventh resistor R11 is connected in sequence to the positive terminal of the first diode D1 and one end of the coil in the relay, and the other end is connected to the negative terminal of the indicator LED1; the positive terminal of the indicator LED1 is connected in sequence to the negative terminal of the first diode D1 and the other end of the coil in the relay.

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