CN219105028U - Switch current detection device of elevator button - Google Patents

Abstract

The utility model provides a switching current detection device of an elevator button, which mainly comprises a main control circuit board, pin terminals electrically connected with the main control circuit board and the like. Wherein the pin terminals have connection ends for electrically connecting with the pins of the elevator button, respectively. Wherein, the main control circuit board includes: a microcontroller, a relay switching circuit and a switching current detection circuit electrically connected with the microcontroller and the pin terminal, etc. Compared with the prior art, the switch current detection device of the elevator button can perform current test on the working state of the elevator button, so that the test efficiency is improved.

Description

Switch current detection device of elevator button

Technical Field

The utility model relates to the field of elevators, in particular to a switch current detection device of an elevator button.

Background

An elevator button, which is a common component in elevators, is provided to facilitate the corresponding operation by the user.

However, in the prior art, prior elevators have required button testing to verify the reliability and compatibility of the buttons before shipment. However, since the corresponding plug-ins of the buttons of each elevator brand are different, when the main circuit board of the elevator is connected, at least two pins are usually switch pins and two pins are LED pins of LED lamps, wherein the LED lamps are used for lighting the elevator buttons due to different definition of pins of the buttons.

In the existing test mode, a professional technician is usually required to connect a corresponding button test line and test equipment, such as a universal meter, to each elevator button, so that an operator can produce the test, the operation is inconvenient, time and labor are consumed, and the current when the LED cathode pin and the LED anode pin are communicated cannot be detected, namely the working state of the elevator button is tested.

Therefore, how to test the working state of the elevator button conveniently to improve the test efficiency is a technical problem to be solved in the utility model.

Disclosure of Invention

The utility model aims at facilitating the current test on the working state of the elevator button so as to improve the test efficiency.

To this end, the utility model proposes a switching current detection device of an elevator push button, comprising:

a main control circuit board;

a pin terminal electrically connected with the main control circuit board and provided with connection ports respectively used for electrically connecting with the pins of the elevator button;

wherein, the main control circuit board includes: the microcontroller, the relay switching circuit and the switch current detection circuit are electrically connected with the microcontroller and the pin terminal;

one end of the switching current detection circuit is electrically connected with the microcontroller, and the other end of the switching current detection circuit is electrically connected with the pin terminal through the relay switching circuit;

wherein, the relay switching circuit has a current protection circuit.

Further preferably, the relay switching circuit includes: an electromagnetic relay switching circuit; a power relay electrically connected to the electromagnetic relay switching circuit, and a solid state relay switching circuit electrically connected to the electromagnetic relay switching circuit and the power relay and forming the current protection circuit; wherein the electromagnetic relay switching circuit includes: and the output terminals of the electromagnetic relays are respectively and electrically connected with the power supply relay and a corresponding connection port.

Further preferably, the solid state relay switching circuit includes: and one end of the input end of each solid-state relay is electrically connected with the microcontroller while the other end is grounded, one end of the output end of each solid-state relay is electrically connected with the corresponding connecting port through a fuse, and the other end of each solid-state relay is electrically connected with the power relay.

Further preferably, the switching current detection circuit includes: the first transistor, the first resistor, the second resistor, the third resistor and the fourth resistor; after the second resistor and the third resistor are connected in parallel, one end of the second resistor is grounded, and the other end of the second resistor is electrically connected with the microcontroller through the first resistor connected in series; the emitter of the first triode is electrically connected with the output end of the solid-state relay through the fuse; one end of the fourth resistor is electrically connected with the first direct current voltage, and the other end of the fourth resistor is electrically connected with the base electrode of the first triode; the collector electrode of the first triode is connected with the second resistor and the third resistor which are connected in parallel in series so as to be connected with the ground; the fourth resistor is grounded through the fifth resistor.

Further preferably, the current detection circuit further includes: a protection circuit connected in parallel with the second resistor and the third resistor; wherein, the protection circuit includes: a sixth resistor, a seventh resistor, and a second triode; the base electrode of the second triode is electrically connected with the sixth resistor and the seventh resistor; the collector electrode of the second triode is electrically connected with the second resistor and the third resistor; the emitter of the second triode is electrically connected with the fourth resistor and the base electrode of the first triode; one end of the seventh resistor is connected with the second direct current voltage.

Further preferably, the number of the solid state relays is four; the number of the electromagnetic relays is four.

Further preferably, the fusing current of the fuse is 0.1A; the withstand voltage value of the fuse was 30V.

Further preferably, the method further comprises: a communication circuit electrically connected to the microcontroller; the communication circuit is used for being in communication connection with the intelligent terminal so as to conduct a circuit between two corresponding connection ports through the relay switching circuit after receiving a detection signal sent by the intelligent terminal; wherein the communication circuit includes: the communication interface or the wireless communication module is electrically connected with the microcontroller and is used for being in communication connection with the intelligent terminal; the intelligent terminal is any one of a computer, a mobile phone or a tablet.

Further preferably, the method further comprises: a shell provided with the main control circuit board inside; the display panel is electrically connected with the main control circuit board and is arranged on the shell; the indication lamp is electrically connected with the main control circuit board and is arranged on the shell; the status display lamp is electrically connected with the main control circuit board and is arranged on the shell; the voltage adjusting button is arranged on the side wall of the shell and is electrically connected with the main control circuit board; the pin test button is arranged on the side wall of the shell and is electrically connected with the main control circuit board; and the alarm buzzer is electrically connected with the main control circuit board.

Compared with the prior art, the utility model has the beneficial effects that: the switch current detection device of the elevator button carries out current test on the working state of the elevator button so as to improve the test efficiency.

Drawings

Fig. 1 is a schematic circuit diagram of a switching current detecting device of an elevator button according to a first embodiment of the present utility model;

fig. 2 is a schematic diagram showing a partial circuit configuration of an elevator button switch current detecting device according to a first embodiment of the present utility model when the elevator button switch current detecting device is connected to the elevator button;

FIG. 3 is a schematic diagram of the wiring of a solid state relay in a first embodiment of the present utility model;

FIG. 4 is a schematic diagram of the power relay according to the first embodiment of the present utility model;

fig. 5 is a schematic structural view of an electromagnetic relay according to a first embodiment of the present utility model;

FIG. 6 is a schematic diagram of a preferred current detection circuit according to the first embodiment of the present utility model;

FIG. 7 is a schematic diagram of a preferred current detection circuit according to the first embodiment of the present utility model;

fig. 8 is a circuit block diagram of a switching current detecting device of an elevator button in the first embodiment of the present utility model;

fig. 9 is a schematic circuit diagram of a switching current detecting device of an elevator button according to a second embodiment of the present utility model;

fig. 10 is a schematic diagram showing a partial circuit configuration of an elevator button switch current detecting device according to a second embodiment of the present utility model when the elevator button switch current detecting device is connected to the elevator button;

FIG. 11 is a schematic circuit diagram of a switching voltage circuit according to a second embodiment of the present utility model;

fig. 12 is a schematic view showing a back structure of a switching current detecting device of an elevator button according to a third embodiment of the present utility model;

fig. 13 is a schematic diagram showing a front structure of a switching current detecting device of an elevator button according to a third embodiment of the present utility model.

Fig. 14 is a circuit block diagram of a switching current detecting device of an elevator button in a third embodiment of the present utility model.

Detailed Description

The switching current detecting device of the elevator push button of the present utility model will be described in more detail with reference to the accompanying schematic drawings, in which preferred embodiments of the present utility model are shown, it being understood that the present utility model described herein can be modified by those skilled in the art, while still achieving the advantageous effects of the present utility model. Accordingly, the following description is to be construed as broadly known to those skilled in the art and not as limiting the utility model.

Example 1

Referring to fig. 1 to 8, in the present embodiment, a switching current detecting device of an elevator button is provided, which is mainly composed of a main control circuit board 10, a pin terminal 1 electrically connected with the main control circuit board 10, and the like. Wherein the PIN terminal 1 has connection ports for electrical connection with the PINs of the elevator button 8, respectively, specifically referring to connection port PIN1, connection port PIN2, connection port PIN3 and connection port PIN4 in fig. 1.

Wherein, the main control circuit board includes: a Microcontroller (MCU), a relay switching circuit and a switching current detection circuit 6 electrically connected with the Microcontroller (MCU) and the pin terminal 1, etc.

One end of the switching current detection circuit 6 is electrically connected to the microcontroller, and the other end is electrically connected to the pin terminal through the relay switching circuit. Wherein, the relay switching circuit has a current protection circuit.

From the above, it can be seen that: the switching current detecting device in this embodiment can electrically connect each port in the pin terminal 1 with each pin of the elevator button by means of the relevant connecting means, such as a connecting wire, when the elevator button is tested. During actual testing, the relay switching circuit can be controlled manually or remotely and automatically, and the circuit between the two corresponding connection ports is automatically conducted for testing, so that the pin of the elevator button 8, such as whether the LED anode pin is connected with the corresponding LED cathode pin in a conducting way, is convenient for subsequent measurement, and is used for detecting whether the LEDs on the elevator button are in a normal working state and whether various performances meet requirements or not. And when the LED pin communicated with the elevator button can be detected through the switch current detection circuit 6, the output current of the elevator button is used for detecting the current of the elevator button in the working state, and whether the working state of the elevator button is normal or not is detected through the current, so that the test efficiency is improved. And moreover, the current protection circuit can prevent the damage of the LED lamp caused by overlarge current.

In addition, in general, at least two elevator buttons are LED pins, and the other two pins are SW switch pins. The switch current detection circuit in this embodiment is switched by the relay switching circuit, and after two LED pins are connected and tested, the other two pins are determined as the pins of the SW switch, so as to facilitate subsequent testing. Of course, the switching current detection circuit in this embodiment can test the two pins corresponding to the LEDs of the two elevator buttons respectively through the switching of the relay switching circuit.

Specifically, the relay switching circuit may be constituted by the electromagnetic relay switching circuit 5, the power relay 3 to which the electromagnetic relay switching circuit 5 is electrically connected, the solid-state relay switching circuit 2 to which the electromagnetic relay switching circuit and the power relay 3 are electrically connected and which forms the above-described current protection circuit, and the like. The electromagnetic relay switching circuit is mainly composed of a plurality of electromagnetic relays 5 and the like electrically connected with the microcontroller, and output terminals of the electromagnetic relays 5 are respectively electrically connected with the power relay 3 and a corresponding connection port.

Specifically, the solid-state relay switching circuit 2 includes: and one end of the input end of each solid state relay is electrically connected with the microcontroller, the other end of the input end of each solid state relay is grounded, one end of the output end of each solid state relay is electrically connected with the corresponding connecting port through a fuse, and the other end of the output end of each solid state relay is electrically connected with the power relay 3. The electromagnetic relay switching circuit 5 includes: and the output terminals of the electromagnetic relays are respectively and electrically connected with the power relay 3 and a corresponding connection port. Wherein the solid state relay control switch is six to twelve. As shown in fig. 1, only four solid state relays and four electromagnetic relays are taken as an example for illustration, and in practical application, the number of solid state relays 2a, 2b, 2c, 2d and electromagnetic relays 5a, 5b, 5c, 5d may be other, for example, six, eight, twenty, etc. to meet different test requirements. In fig. 3, a specific connection circuit of the solid-state relay 2a is only described as an example. In fig. 4, a specific connection circuit of the power relay is only described as an example. In addition, the fuses F3 in fig. 3 may function as protection circuits, respectively, to form the above-described current protection circuits. In addition, it should be noted that, in the present embodiment, the maximum fusing currents of the fuse F3 and the fuse F11 in the power relay 3 are both 0.1A, and the maximum withstand voltage is 30V.

In addition, through the switching cooperation of the solid-state relay switching circuit 2 and the electromagnetic relay switching circuit 5, two different connection ports on the pin terminal 1 can be automatically conducted and tested, then the situation that the same connection port is conducted simultaneously to generate a short circuit can be avoided by binding opposite serial numbers, the circuit diagram shown in fig. 1 is referred to, the connection mode of the current detection circuit and the corresponding solid-state relay in fig. 1 is only one of the preferred connection modes, only the reference explanation is provided, the current detection circuit can be composed of one or more than one current detection circuits and respectively connected with the corresponding solid-state relay or electromagnetic relay, and specific limitation and redundant description are omitted. In addition, through the cooperation of solid-state relay control switch and normally open relay control switch, can play the guard action to solid-state relay control switch, when being unlikely to the test, elevator button's output current is too big.

Further preferably, the power relay 3 is a single pole double throw relay; the power supply circuit to which the power relay 3 is electrically connected includes at least: a first power supply circuit outputting 12V voltage; and a second power supply circuit with an output voltage of 24V. Through this structure, can realize the different operating voltage of elevator button test to satisfy corresponding electric current test demand.

As shown in fig. 6, the current detection circuit in the present embodiment includes a first transistor Q2, a first resistor R40, a second resistor R41, a third resistor R69, a fourth resistor R32, and the like. After the second resistor R41 and the third resistor R69 are connected in parallel, one end of the second resistor R41 is grounded, and the other end of the second resistor R69 is electrically connected with the microcontroller through the first resistor R40 connected in series; the emitter of the first triode Q2 is electrically connected with the output end of the solid-state relay through a first fuse F12; one end of the fourth resistor R32 is electrically connected with the first direct current voltage, and the other end of the fourth resistor R is electrically connected with the base electrode of the first triode Q2; the collector of the first triode Q2 is connected with a second resistor R41 and a third resistor R69 which are connected in parallel in series so as to be grounded; the fourth resistor R32 is grounded through a fifth resistor R35. It should be noted that fig. 1 in this embodiment only illustrates a preferred connection circuit of the current detection circuit 6 as a connection port for connecting PIN1 shown in fig. 2, and in this embodiment, different connection ports can be electrically connected to the current detection circuit 6 through a relay switching circuit. In addition, the resistance value of each resistor in the current detection circuit 6 of the present embodiment is 1K to 4.7K, and more preferably 2.4kΩ.

With this structure, the output current of the elevator button can be detected well. The specific procedure is briefly described as follows:

the voltage formed by the parallel connection of the second resistor R41 and the third resistor R69 is used for obtaining the voltage at two ends of the LEDs of the elevator buttons which are connected IN parallel, so that the voltage at two ends of the LEDs of the elevator buttons is obtained through the level signal obtained by the IN_MCU pin of the microcontroller, and the working current of the LEDs of the elevator buttons when the LEDs of the elevator buttons are lightened is calculated according to the resistance (preset resistance value determined according to the type and production parameters of the elevator buttons) IN the elevator buttons. In addition, through the detected current, whether the solid state relay switching circuit 2 is communicated with the LED anode pin and the LED cathode pin of the elevator button after being switched to be communicated with the corresponding pin terminal 1 is automatically judged, so that whether the elevator button is in a normal working state is conveniently judged. For example, if the LED anode pin and the LED cathode pin of the elevator button are in a conductive state, the first transistor Q2 is turned on. In addition, the first fuse F12 can protect the circuit and prevent the electronic device from being damaged due to overlarge current.

Further preferably, as shown in fig. 7, the current detection circuit 6 further includes: and a protection circuit connected in parallel with the second resistor R41 and the third resistor R69. Wherein, the protection circuit includes: a sixth resistor R38, a seventh resistor R35, a second transistor Q4, and the like. The base of the second triode Q4 is electrically connected to the sixth resistor R38 and the seventh resistor R35. The collector electrode of the second triode Q4 is electrically connected with a second resistor R41 and a third resistor R69; the emitter of the second triode Q4 is electrically connected with the fourth resistor R32 and the base electrode of the first triode Q2; one end of the seventh resistor R35 is connected to the second dc voltage. By the cooperation of the second transistor Q4 and the third resistor R69, the reverse current generated by the excessive current can be prevented, so that the electronic devices such as the first transistor Q2 and the LED lamp are damaged.

In the present embodiment, the maximum fusing currents of the fuse F11 and the fuse F12 are 0.1A, and the maximum withstand voltage is 30V.

As a further preference, the main control circuit board 10 further includes: and the communication circuit is electrically connected with the Microcontroller (MCU) and the pin terminal 1, wherein the communication circuit is used for being in communication connection with the intelligent terminal so as to conduct a circuit between the two corresponding connection ports through the relay switching circuit after receiving a detection signal sent by the intelligent terminal.

From the above, it can be seen that: by means of the above-described circuit in the main control circuit board 10, the switching current detecting device of the elevator button can electrically connect the ports in the pin terminal 1 with the pins of the elevator button through the relevant connecting devices, such as connecting wires, when the elevator button is tested. In addition, the circuit communication circuit in the main control circuit board 10 can be in communication connection with the intelligent terminal, so that after receiving a detection signal sent by the intelligent terminal, the circuit between the two corresponding connection ports is automatically conducted through the relay switching circuit to test, thereby being convenient for detecting whether the pins of the elevator button are connected in a conducting manner, for example, whether the LED pins are connected in a conducting manner, being convenient for subsequent measurement, so as to detect whether the elevator button is in a normal working state or not and whether all performances meet requirements or not, and the like.

Example two

In this embodiment, there is further provided a switching current detecting device of an elevator button, which is a further improvement of the above embodiment, as shown in fig. 9 to 10, the main control circuit board 10 in this embodiment further includes: and a switching voltage detection circuit 7 electrically connected to one end of the output terminal of the solid state relay in the above embodiment and the other end thereof to the microcontroller. The switching voltage detection circuit 7 may be configured by a voltage detection transistor Q6, a first voltage dividing resistor R47, a second voltage dividing resistor R50, a third voltage dividing resistor R46, and the like. One end of the first voltage dividing resistor R47 is electrically connected with the output end of the electromagnetic relay switching circuit or the solid-state relay switching circuit; one end of the second voltage dividing resistor R50 is electrically connected with the first voltage dividing resistor R47, and the other end of the second voltage dividing resistor R is grounded; the base electrode and the collector electrode of the voltage detection triode Q6 are respectively connected with two ends of the second voltage dividing resistor R50 in parallel; one end of the third voltage dividing resistor R46 is electrically connected to the third direct-current voltage and the microcontroller, and the other end is electrically connected to the emitter of the voltage detecting transistor Q6.

The switching voltage detection circuit can be used for: when the SW switch anode pin and the SW switch cathode pin of the elevator button are switched to be communicated with the corresponding pin terminals 1 by the first relay switching circuit 2, a short circuit is formed, so that the voltage detection triode Q6 is in a non-conducting state, the voltage between the base electrode and the emitter is close to 0, the level signal acquired by the microcontroller is 0, and the SW switch anode pin and the SW switch cathode pin of the elevator button can be judged to be in a communicating state.

Here, since the voltage is tested without considering the influence of the current, the relay switching circuit may be configured only by the electromagnetic relay switching circuit and the power relay 3, and in this embodiment, the relay switching circuit is further provided with a solid-state relay switching circuit based on the requirements of other tests, such as the requirements of current detection, and the switching voltage detection circuit is electrically connected to one end of the solid-state relay switching circuit. As shown in fig. 9 and 10, only one preferred connection circuit of the switching voltage detection circuit 7 is illustrated in the present embodiment, which connects the connection ports of PIN1 and PIN2, but in the present embodiment, different connection ports may be electrically connected to the switching voltage detection circuit 7 through a relay switching circuit.

Further preferably, one end of the first voltage dividing resistor R50 is electrically connected to an output terminal of the solid-state relay.

Further preferably, the switching voltage detection circuit 7 further includes: and a capacitor C39 provided in parallel with the second voltage dividing resistor R50. The capacitor can play roles in filtering clutter and protecting a switching voltage detection circuit. The capacitance of the capacitor C39 in this embodiment may be preferably 0.047 to 0.22uF.

In addition, it should be noted that, in fig. 9, the connection manner between the switching voltage detection circuit and the current detection circuit and the corresponding solid-state relay is only one preferred method, and only reference is made to the description, and the switching voltage detection circuit and the current detection circuit may be each formed by one or more of them and respectively connected to the corresponding solid-state relay or electromagnetic relay, which is not specifically limited and described herein.

Example III

Referring to fig. 12 to 14, in this embodiment, there is provided a switching current detecting device of an elevator button, which is a further improvement of any of the above embodiments, the improvement comprising: a housing 9 in which the main control circuit board 10 is disposed; a display panel electrically connected with the main control circuit board 10 and arranged on the shell 9; and a status display lamp electrically connected with the main control circuit board 10 and arranged on the shell 9.

Through display panel, can make the switch current detection device of elevator button in this embodiment when using, can be through pressing pin test button, so that main control circuit board 10 tests elevator button according to the output voltage who matches with pin test button, for example 12V or 24V, test elevator button's LED lamp, and show the output current of elevator button that detects at display panel, in order to judge whether belong to normal scope, and whole process, need not to carry out alone to connect wire elevator button, upper computer or main control panel through main control circuit board 10 and control elevator button carries out communication connection, can realize showing elevator button's output current, that is the current when the LED pin of intercommunication elevator button carries out the inspection, and can realize the output adjustment to the output voltage who matches with pin test button according to the voltage adjustment button who sets up on the display panel.

Further, as a further preferable mode, if the main control circuit board 10 is provided with a switching voltage detection circuit, the display panel may display whether or not the voltage is a normal value when the switching pin of the elevator button is connected.

Further preferably, the switching current detecting device of the elevator button further includes: and a warning lamp 96 which is electrically connected with the main control circuit board 10 and is arranged on the side wall of the shell 9. When the detected current of the elevator button is abnormal, the fuse is fused, or the voltage of the switch pin of the elevator button is abnormal, the warning lamp 96 can give a warning.

Further preferably, the switching current detecting device of the elevator button further includes: and an alarm buzzer electrically connected with the main control circuit board 10. When the detected current or voltage of the elevator button is abnormal, a warning can be sent out through warning.

Further preferably, the pin test button includes: a plurality of pin test buttons 92 are electrically connected with the main control circuit board 10. Through the pin button according to different port configurations, can make the relay switch circuit install the signal that matches the binding with the pin button, switch over to switch on corresponding port, with above-mentioned elevator button test, with the SW switch positive pole pin of detecting elevator button and SW switch negative pole pin whether normally communicate, and LED positive pole pin and LED negative pole pin whether normally communicate. In this embodiment, the number of pin test buttons 92 is preferably 12, which is illustrated as an example, but in practice, the number may be four or other numbers to meet the actual needs, and will not be described herein.

Further preferably, the switching current detecting device of the elevator button further includes: a voltage adjusting button 98 provided on a side wall of the housing 9 is electrically connected to the main control circuit board 10. The voltage required to test the elevator button is determined by pressing the voltage adjustment button, e.g. 24V or 12V. Also, the voltage adjustment button 98 in this embodiment is preferably a toggle switch.

Further preferably, the switching current detecting device of the elevator button further includes: and the communication module is used for being electrically connected with an upper computer of the elevator button so as to facilitate information transmission and signal control, in particular to remote control and information acquisition. The communication module may be preferably a wireless communication module, such as a WIFI module or a bluetooth module.

Further preferably, the number of status display lamps in the switch current detecting device of the elevator button is plural, and each status display lamp is respectively bound with the corresponding position of the elevator button, so that the connection line of the abnormal button pin on the elevator button can be accurately obtained.

In addition, the two status display lamps in this embodiment may be preferably in different color states when they are turned on, wherein, as shown in fig. 13, the first status display lamp 93 is used for being turned on in green when the LED anode pin and the LED cathode pin of the elevator button are connected, that is, the corresponding connection ports are connected. The second status indicator lamp 95 is used for being turned on in red when the SW switch anode pin and the SW switch cathode pin of the elevator button are communicated, and the rest states are turned off. It should be noted that, the status display lamp 93 in the present embodiment may be limited to the first status display lamp 93 and not include the second status display lamp 95 to meet the actual testing requirement.

Further preferably, the switching current detecting device of the elevator button further includes: the indicator lamps 97 are electrically connected with the main control circuit board 10 and are arranged on the shell 9, and the number of the indicator lamps 97 is at least four, and the indicator lamps respectively display different colors so as to match and bind corresponding connection ports. Through this structure, can realize fast switching the difference of connecting port to the relay to the port of connecting elevator button's switch pin is found out to the manual work, thereby promotes efficiency of software testing.

It can be seen from the above that: the switch current detection device of the elevator button does not need to manually connect and test pins of the elevator button one by one, so that the operation is simplified, and the testing efficiency is improved.

The foregoing is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any person skilled in the art will make any equivalent substitution or modification to the technical solution and technical content disclosed in the utility model without departing from the scope of the technical solution of the utility model, and the technical solution of the utility model is not departing from the scope of the utility model.

Claims (10)

1. An elevator button switch current detection device, characterized by comprising:

a main control circuit board;

a pin terminal electrically connected with the main control circuit board and provided with connection ports respectively used for electrically connecting with the pins of the elevator button;

wherein, the main control circuit board includes: the microcontroller, the relay switching circuit and the switch current detection circuit are electrically connected with the microcontroller and the pin terminal;

one end of the switching current detection circuit is electrically connected with the microcontroller, and the other end of the switching current detection circuit is electrically connected with the pin terminal through the relay switching circuit;

wherein, the relay switching circuit has a current protection circuit.

2. The switching current detecting device of an elevator button according to claim 1, wherein the relay switching circuit includes: an electromagnetic relay switching circuit; a power relay electrically connected to the electromagnetic relay switching circuit, and a solid state relay switching circuit electrically connected to the electromagnetic relay switching circuit and the power relay and forming the current protection circuit; wherein the electromagnetic relay switching circuit includes: and the output terminals of the electromagnetic relays are respectively and electrically connected with the power supply relay and a corresponding connection port.

3. The switching current detecting device of an elevator button according to claim 2, wherein the solid state relay switching circuit includes: and one end of the input end of each solid-state relay is electrically connected with the microcontroller while the other end is grounded, one end of the output end of each solid-state relay is electrically connected with the corresponding connecting port through a fuse, and the other end of each solid-state relay is electrically connected with the power relay.

4. The switching current detecting device of an elevator button according to claim 2, wherein the switching current detecting circuit includes: the first transistor, the first resistor, the second resistor, the third resistor and the fourth resistor; after the second resistor and the third resistor are connected in parallel, one end of the second resistor is grounded, and the other end of the second resistor is electrically connected with the microcontroller through the first resistor connected in series; the emitter of the first triode is electrically connected with the output end of the solid-state relay through a fuse; one end of the fourth resistor is electrically connected with the first direct current voltage, and the other end of the fourth resistor is electrically connected with the base electrode of the first triode; the collector electrode of the first triode is connected with the second resistor and the third resistor which are connected in parallel in series so as to be connected with the ground; the fourth resistor is grounded through a fifth resistor.

5. The switching current detecting device of an elevator button according to claim 4, wherein the current detecting circuit further comprises: a protection circuit connected in parallel with the second resistor and the third resistor; wherein, the protection circuit includes: a sixth resistor, a seventh resistor, and a second triode; the base electrode of the second triode is electrically connected with the sixth resistor and the seventh resistor; the collector electrode of the second triode is electrically connected with the second resistor and the third resistor; the emitter of the second triode is electrically connected with the fourth resistor and the base electrode of the first triode; one end of the seventh resistor is connected with the second direct current voltage.

6. The switching current detecting device of an elevator button according to claim 2, wherein the number of the solid state relays is four; the number of the electromagnetic relays is four.

7. The switching current detecting device for an elevator button according to claim 4, wherein a fusing current of the fuse is 0.1A; the withstand voltage value of the fuse was 30V.

8. The switching current detecting device of an elevator button according to claim 2, further comprising: a communication circuit electrically connected to the microcontroller; the communication circuit is used for being in communication connection with the intelligent terminal so as to conduct a circuit between two corresponding connection ports through the relay switching circuit after receiving a detection signal sent by the intelligent terminal; wherein the communication circuit includes: the communication interface or the wireless communication module is electrically connected with the microcontroller and is used for being in communication connection with the intelligent terminal; the intelligent terminal is any one of a computer, a mobile phone or a tablet.

9. The switching current detecting device for an elevator button according to claim 1, further comprising: a shell provided with the main control circuit board inside; the display panel is electrically connected with the main control circuit board and is arranged on the shell; the indication lamp is electrically connected with the main control circuit board and is arranged on the shell; the status display lamp is electrically connected with the main control circuit board and is arranged on the shell; the pin test button is arranged on the side wall of the shell and is electrically connected with the main control circuit board; the voltage adjusting button is arranged on the side wall of the shell and is electrically connected with the main control circuit board; and the alarm buzzer is electrically connected with the main control circuit board.

10. The switching current detecting device for an elevator button according to claim 9, wherein the number of the indication lamps is at least four, which respectively display different colors to match the corresponding connection ports.

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