Two-wire elevator button drive system and control method

Abstract

The present invention belongs to the field of elevator control technology and provides a two-wire elevator button drive system and control method. The system includes a current detection circuit connected to an elevator button module, configured to collect the current value flowing through the corresponding elevator button module when the button switch is triggered; and a control circuit configured to receive the current value collected by the current detection circuit, calculate the current change value, and output an indicator light signal to the button switch through the current detection circuit, thereby illuminating the indicator light on the button switch. The present invention has the advantage that only two wiring harnesses are required to connect each elevator button module to the elevator button control panel. By adopting a novel two-wire elevator button drive system and control method, control of elevator car floor buttons or hall up / down call buttons can be achieved. The system can also achieve dual-color mixed indication of the elevator buttons, significantly reducing the number of button wiring harnesses and wiring space.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator control, and in particular to a two-wire elevator button driving system and a control method. Background Art

[0002] At present, elevator control boxes (including control boxes for disabled people used in handicap elevators) and hall call boxes are becoming increasingly miniaturized, while the elevator car floor or hall call buttons mostly use 6-wire two-color buttons and 4-wire single-color buttons, that is, 6-core and 4-core wiring harnesses. The more floor buttons an elevator has, the more corresponding floor button wires there are in the elevator car control box, resulting in messy button wiring harnesses in the narrow elevator control box space, which brings inconvenience to workshop production and on-site installation and maintenance, and also increases the corresponding fault points. Summary of the Invention

[0003] The object of the present invention is to provide a two-wire elevator button drive system and control method to solve the above problems.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A two-wire elevator button drive system is provided with a plurality of elevator button modules, each of which is provided with a button switch capable of triggering elevator operation, and includes a current detection circuit connected to the elevator button module, which is configured to collect the current value flowing through the corresponding elevator button module when the button switch is triggered;

[0006] The control circuit is configured to receive the current value collected by the current collection circuit, calculate the current change value, and output an indicator light signal to the button switch through the current detection circuit, so that the indicator light on the button switch lights up.

[0007] Furthermore, a button drive circuit is provided between the control circuit and the current detection circuit, which amplifies the indicator light signal output by the control circuit and isolates the output voltage signal to the button switch.

[0008] Furthermore, a current sampling resistor is provided in the current detection circuit, which is connected in series between the button drive circuit and the elevator button module. The current signal on the elevator button module is converted into a first voltage signal by the current sampling resistor and output to the control circuit.

[0009] Furthermore, the first voltage signal generated by the current sampling resistor is introduced into the input end of the signal isolation chip, and after isolation and transmission by the signal isolation chip, the differential voltage signal is output to the operational amplifier. The operational amplifier amplifies the differential voltage signal and then outputs a second voltage signal to the control circuit.

[0010] Furthermore, a button current increasing circuit is provided in the elevator button module, which increases the current flowing through the button switch when the button switch is triggered, and the increased current value can be collected by the current detection circuit.

[0011] Furthermore, the control circuit is configured to be able to determine the working status of the indicator light according to the current value of the current detection circuit and issue an early warning to the elevator main controller.

[0012] Another aspect of the present invention further provides a two-wire elevator button drive control method, comprising:

[0013] After the elevator is powered on, the control circuit outputs a backlight indication signal to each button switch, so that the backlight on the button switch lights up, and the current detection circuit collects the first current value flowing through the button switch at this time and sends it to the control circuit for storage;

[0014] When the button switch is triggered, the current detection circuit collects a second current value flowing through the button switch and sends it to the control circuit for storage;

[0015] The control circuit calculates the variation between the first current value and the second current value, and when the variation exceeds a preset threshold, outputs an indicator light signal to the button switch via the current detection circuit, so that the backlight on the corresponding button switch becomes an indicator light.

[0016] Furthermore, the indicator light signal output by the control circuit is amplified by the button drive circuit and the output voltage signal is isolated and sent to each button switch.

[0017] Furthermore, the step of controlling the circuit to receive the current value includes:

[0018] Converting the current signal flowing through the push button switch into a first voltage signal through the current sampling resistor;

[0019] The first voltage signal is isolated and transmitted by the signal isolation chip, and then outputs a differential voltage signal to the operational amplifier. The operational amplifier amplifies the differential voltage signal and then outputs a second voltage signal to the control circuit.

[0020] Furthermore, the control circuit determines the working status of the backlight and the indicator light on the push button switch according to the collected first current value and the second current value and issues an early warning to the elevator main controller.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] (1) By adopting a novel two-wire elevator button drive system and control method, the floor buttons in the elevator car or the up and down call buttons outside the hall can be controlled, and the elevator buttons can be indicated by a mixed color of two colors at most, which greatly reduces the button wiring harness, reduces the wiring space, improves the workshop production efficiency, reduces wiring errors, and brings great convenience to on-site installation and maintenance;

[0023] (2) The control circuit can self-learn the current value of the indicator light in each elevator button to achieve self-monitoring of the quality of the elevator button indicator light. If there is any abnormality, it can be directly notified to the elevator main controller to achieve an early warning function. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 1 is a schematic diagram of the framework of an elevator button driving system according to an embodiment of the present invention;

[0025] Figure 2 is a circuit diagram of a current detection circuit in an embodiment of the present invention;

[0026] Figure 3 1 is a flowchart of the steps of the elevator button drive control method in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] It should be noted that terms such as "first," "second," and "one" in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0028] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0029] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0031] like Figure 1 As shown, the present invention provides a two-wire elevator button drive system, which is provided with multiple elevator button modules, a current detection circuit, a control circuit and a button drive circuit. The elevator button module is provided with a button switch that can be triggered to run the elevator and a button current increasing circuit.

[0032] The control circuit is the system control and data processing center, and this circuit is also the center for data interaction with the elevator main controller. It mainly controls the button drive circuit and receives the current value of each button switch output collected by the current detection circuit, and controls the current value and the indicator light on the corresponding button switch.

[0033] The button drive circuit is used to receive the elevator button drive signal sent by the control circuit, amplify each drive control signal and isolate the output voltage to the corresponding button switch.

[0034] The current detection circuit is configured to collect the current value flowing through the corresponding elevator button module and transmit the current value signal to the control circuit in real time.

[0035] like Figure 2 As shown, the current detection circuit is provided with a mΩ-level current sampling resistor RS1, which is connected in series between the button driving circuit and the elevator button module, and converts the current signal on the elevator button module into a first voltage signal through the current sampling resistor.

[0036] Figure 2 In the circuit, resistors R1 and R2 are current-limiting resistors and form a 5V voltage loop with the power chip ZD1, and provide voltage to the VDD1 port of the signal isolation chip IC1. Resistor R8 is the output current-limiting resistor of the operational amplifier. Capacitors C1, C2, and C5 are power supply or signal anti-interference filter capacitors. Resistors R6, R7 and capacitors C3, C4 together with the operational amplifier IC2 form an integrating operational amplifier circuit.

[0037] The first voltage signal generated by the current sampling resistor is introduced into the IN+ input terminal of the signal isolation chip IC1. After the sampling signal is optically isolated and linearly transmitted by the signal isolation chip IC1, the differential voltage signal is output through the OUT+ and OUT- ports to the operational amplifier IC2. The operational amplifier IC2 amplifies the differential voltage signal and then outputs a second voltage signal to the control circuit for further analysis and processing.

[0038] The indicator light on the button switch is used to indicate the elevator button background light or that the elevator button has been selected and registered. The button current increasing circuit increases the current value flowing through the button switch when the button switch is triggered.

[0039] Elevator buttons are divided into floor buttons in the elevator car and up and down direction call buttons. They are used by passengers to select the destination floor or call the elevator. At the same time, when the elevator is in normal mode, when the passenger presses the corresponding elevator floor and direction call button, the indicator light in the button will light up, indicating that the floor button has been registered and the floor selection is successful.

[0040] The control circuit, button drive circuit and current detection circuit can be integrated into an elevator button control panel, or can be streamlined and integrated into a single hall call serial communication display, which greatly reduces the button wiring harness, reduces the wiring space, improves workshop production efficiency, reduces wiring errors, and brings great convenience to on-site installation and maintenance.

[0041] When the system is working, the control circuit will first send the backlight indication signal of the button switch to the corresponding elevator button signal input terminal of the button drive circuit. The button drive circuit amplifies and isolates the indication signal, sends it to the corresponding elevator button module through the corresponding current detection circuit, and then outputs a voltage signal to the actual button switch. When the indicator light on the button switch receives the voltage signal, the backlight on the button switch lights up. At the same time, the current detection circuit collects the first current value flowing through the button switch and sends it to the control circuit to confirm that the indicator light of the button switch has been energized. At the same time, the actual current value of the button indicator light is stored.

[0042] When a passenger presses the button switch, the button switch is turned on, and the button current increase circuit in the elevator button module is triggered at the same time, causing the loop load current of the elevator button module in the current detection circuit to increase. This second current value is directly output to the control circuit. After logical calculation by the control circuit and data exchange with the elevator main control, the control circuit outputs the indicator light signal of the button switch to the button drive circuit, which amplifies and isolates the output high-voltage signal through the current detection circuit to the button switch, and the backlight on the corresponding button switch becomes an indicator light.

[0043] In addition, the control circuit can determine the working status of the backlight and indicator light on the button switch based on the collected first current value and second current value, thereby realizing self-monitoring of the quality of the elevator button indicator light. If any abnormality occurs, it can be directly notified to the elevator main controller, thereby realizing an early warning function.

[0044] In the present invention, only two wire harnesses are needed to connect each elevator button module to the elevator button control panel. By adopting a novel two-wire elevator button drive system and control method, control of the elevator car floor buttons or the up and down call buttons outside the hall can be achieved. In addition, the elevator buttons can be provided with a dual-color mixed indication of up to two colors. This greatly reduces the number of button wire harnesses, reduces wiring space, improves workshop production efficiency, reduces wiring errors, and greatly facilitates on-site installation and maintenance.

[0045] like Figure 3 As shown, the present invention also provides a two-wire elevator button drive control method, which includes:

[0046] S1. After the elevator is powered on, the control circuit outputs a backlight indication signal to each button switch, so that the backlight on the button switch lights up, and the current detection circuit collects the first current value flowing through the button switch at this time and sends it to the control circuit for storage.

[0047] The indicator light signal output by the control circuit is amplified by the button drive circuit and the output voltage signal is isolated and sent to each button switch.

[0048] S2. When the push button switch is triggered, the current detection circuit collects a second current value flowing through the push button switch and sends it to the control circuit for storage.

[0049] Among them, the step of the control circuit receiving the current value includes: converting the current signal flowing through the button switch into a first voltage signal by the current sampling resistor; the first voltage signal is isolated and transmitted by the signal isolation chip, and then outputs a differential voltage signal to the operational amplifier, and the operational amplifier amplifies the differential voltage signal and then outputs a second voltage signal to the control circuit.

[0050] S3. The control circuit calculates the difference between the first current value and the second current value. When the difference exceeds a preset threshold, the control circuit outputs an indicator light signal to the button switch via the current detection circuit, so that the backlight on the corresponding button switch becomes an indicator light.

[0051] The invention adopts a novel two-wire elevator button driving control method to control the floor buttons in the elevator car or the up and down call buttons outside the hall, and can realize the mixed two-color indication of the elevator buttons at most.

[0052] The control circuit can also determine the working status of the backlight and indicator light on the button switch based on the collected first current value and second current value, thereby realizing self-monitoring of the quality of the elevator button indicator light. If any abnormality occurs, it can directly inform the elevator main controller, thereby realizing an early warning function.

[0053] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A two-wire, two-color elevator button drive system, comprising a plurality of elevator button modules, each of which is provided with a button switch capable of triggering elevator operation, characterized in that: The current detection circuit includes a current detection circuit connected to the elevator button module, the current detection circuit is configured to collect the current value flowing through the corresponding elevator button module and transmit the current value signal to the control circuit in real time; A button drive circuit is provided between the control circuit and the current detection circuit, and is used to receive the elevator button drive signal sent by the control circuit, amplify each drive control signal and isolate the output voltage to the corresponding button switch; The control circuit exchanges data with the elevator main controller, controls the button drive circuit, receives the current value output by each button switch collected by the current detection circuit, and controls the current value and the indicator light on the corresponding button switch; The elevator button module is provided with a button current increasing circuit, which increases the current flowing through the button switch when the button switch is triggered; After the elevator is powered on, the control circuit outputs a backlight indication signal, which is amplified and isolated by the button drive circuit and outputted as a voltage signal to each button switch, so that the backlight on the button switch lights up. The current detection circuit collects the first current value flowing through the button switch at this time and sends it to the control circuit for storage. When the button switch is triggered, the current detection circuit collects a second current value flowing through the button switch and sends it to the control circuit for storage; The control circuit calculates the variation between the first current value and the second current value, and when the variation exceeds a preset threshold, outputs an indicator light signal to the button switch via the current detection circuit, so that the backlight on the corresponding button switch becomes an indicator light.

2. A two-wire two-color elevator button drive system according to claim 1, characterized in that: The current detection circuit is provided with a current sampling resistor, which is connected in series between the button drive circuit and the elevator button module. The current signal on the elevator button module is converted into a first voltage signal by the current sampling resistor and output to the control circuit.

3. A two-wire two-color elevator button drive system according to claim 2, characterized in that: The first voltage signal generated by the current sampling resistor is introduced into the input end of the signal isolation chip. After isolation and transmission by the signal isolation chip, the differential voltage signal is output to the operational amplifier. The operational amplifier amplifies the differential voltage signal and then outputs a second voltage signal to the control circuit.

4. A two-wire two-color elevator button drive system according to claim 1, characterized in that: The control circuit is configured to be able to determine the working state of the indicator light according to the current value of the current detection circuit and issue an early warning to the elevator main controller.

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