Low voltage switch cabinet fire linkage intelligent control device

Abstract

The invention relates to an intelligent control system, and in particular to an intelligent control device for fire linkage of a low-voltage switch cabinet, comprising a control module, a dry-wet node acquisition module, an AD conversion module and a dry-node output module. The dry-wet node acquisition module acquires a fire linkage signal of the switch cabinet and transmits the acquired signal to the AD conversion module. The AD conversion module amplifies the acquired signal and transmits the amplified signal to the control module. The control module switches the on-off state between dry nodes through the dry node output module according to the amplified signal, and the dry node is connected to an external alarm module. The technical solution provided by the invention can effectively overcome the defects of the prior art that the type of fire linkage signal needs to be manually judged and the corresponding connection method is adopted according to the type of the fire linkage signal.

Description

Technical Field

[0001] The invention relates to an intelligent control system, in particular to a fire-fighting linkage intelligent control device for a low-voltage switch cabinet. Background Art

[0002] At present, the fire linkage signals on the market are dry node signals and wet node signals. The dry node has two states: closed and open. There is no polarity between the two dry nodes and they can be interchanged. There is a voltage difference between the wet nodes and there is polarity between the two wet nodes and they cannot be reversed.

[0003] There are two types of fire linkage signals for GCS switch cabinet, dry node signal and wet node signal (DC24V signal). The connection methods between the two types of fire linkage signals and external alarm modules are different. The dry node signal can be directly connected to the external alarm module; but the wet node signal (DC24V signal) needs to be connected to a set of relays to output a dry node signal to connect to the external alarm module. In actual application, it is necessary to manually determine the type of fire linkage signal and then use different connection methods, which is very troublesome to use. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a low-voltage switch cabinet fire linkage intelligent control device, which can effectively overcome the defects of the prior art that manual judgment of the type of fire linkage signal is required and corresponding connection method is adopted according to the type of fire linkage signal.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] The low-voltage switch cabinet fire linkage intelligent control device includes a control module, a dry-wet node acquisition module, an AD conversion module and a dry node output module. The dry-wet node acquisition module acquires the fire linkage signal of the switch cabinet and transmits the acquired signal to the AD conversion module. The AD conversion module amplifies the acquired signal and transmits the amplified signal to the control module. The control module switches the on-off state between the dry nodes through the dry node output module according to the amplified signal. The dry node is connected to an external alarm module.

[0009] Preferably, the dry-wet node acquisition module includes an optical coupler U4 and a wiring terminal P3, the input end of the optical coupler U4 is connected to the first power supply voltage through a resistor R2, and the input end of the optical coupler U4 is connected to the wiring terminal P3 through a voltage regulator diode D4;

[0010] The output end of the optical coupler U4 is connected to the second power supply voltage through the resistor R3, and the output end of the optical coupler U4 is connected to the resistor R5.

[0011] Preferably, the AD conversion module includes two stages of cascaded in-phase proportional circuits.

[0012] Preferably, the AD conversion module includes a first operational amplifier U6A and a second operational amplifier U6B, the in-phase input terminal of the first operational amplifier U6A is connected to the acquisition signal IN of the output terminal of the optical coupler U4 through resistors R8 and R9, and the output terminal of the first operational amplifier U6A is connected to the inverting input terminal;

[0013] The output end of the first operational amplifier U6A is connected to the non-inverting input end of the second operational amplifier U6B through a resistor R7, the output end of the second operational amplifier U6B is connected to the inverting input end through a resistor R11, a resistor R12, and a capacitor C12, and the output end of the second operational amplifier U6B is connected to the control module through a resistor R10.

[0014] Preferably, the dry node output module comprises a transistor Q1 and an electromagnet K1. The transistor Q1 receives a control signal from the control module and switches the on / off state between the dry nodes COM1 and COM2 by controlling the on / off state of the electromagnet K1.

[0015] Preferably, the base of the transistor Q1 is connected to the control module through the resistor R6, and the collector of the transistor Q1 is connected to the first power supply voltage through the electromagnet K1, and the electromagnet K1 is connected between the dry nodes COM1 and COM2, and the dry nodes COM1 and COM2 are connected to the wiring terminal P3.

[0016] Preferably, the first supply voltage is connected to the cathode of the diode D3, and the anode of the diode D3 is connected to the collector of the transistor Q1.

[0017] Preferably, it also includes an isolated power supply module for providing a first power supply voltage, a voltage stabilizing module connected to the isolated power supply module for providing a second power supply voltage, and an indicating module connected to the control module.

[0018] Preferably, the fire linkage signal includes a dry node signal and a wet node signal.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the low-voltage switch cabinet fire linkage intelligent control device provided by the present invention can convert both the dry node signal and the wet node signal output by the switch cabinet into dry node signals, so that it can be directly connected to the external alarm module. There is no need for manual judgment of the type of fire linkage signal, and it is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a circuit diagram of a control module in the present invention;

[0023] Figure 2 It is a circuit diagram of the dry and wet node acquisition module in the present invention;

[0024] Figure 3 is a circuit diagram of the AD conversion module in the present invention;

[0025] Figure 4 It is a circuit diagram of the dry node output module in the present invention;

[0026] Figure 5 It is a circuit diagram of the isolated power supply module in the present invention;

[0027] Figure 6 It is a circuit diagram of the voltage stabilizing module in the present invention;

[0028] Figure 7 It is a circuit diagram of the indicator module in the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Low voltage switch cabinet fire linkage intelligent control device, such as Figures 1 to 4 As shown, it includes a control module, a dry-wet node acquisition module, an AD conversion module and a dry node output module. The dry-wet node acquisition module acquires the fire linkage signal of the switch cabinet and transmits the acquired signal to the AD conversion module. The AD conversion module amplifies the acquired signal and transmits the amplified signal to the control module. The control module switches the on-off state between the dry nodes through the dry node output module according to the amplified signal, and the dry node is connected to the external alarm module.

[0031] like Figure 2As shown, the dry and wet node acquisition module includes an optical coupler U4 and a wiring terminal P3, the input end of the optical coupler U4 is connected to the first power supply voltage through a resistor R2, and the input end of the optical coupler U4 is connected to the wiring terminal P3 through a voltage regulator diode D4;

[0032] The output end of the optocoupler U4 is connected to the second power supply voltage through the resistor R3, and the output end of the optocoupler U4 is connected to the resistor R5.

[0033] like Figure 3 As shown, the AD conversion module includes two stages of cascaded in-phase proportional circuits: a first operational amplifier U6A and a second operational amplifier U6B, the in-phase input terminal of the first operational amplifier U6A is connected to the acquisition signal IN of the output terminal of the optical coupler U4 through resistors R8 and R9, and the output terminal of the first operational amplifier U6A is connected to the inverting input terminal;

[0034] The output end of the first operational amplifier U6A is connected to the non-inverting input end of the second operational amplifier U6B through a resistor R7, the output end of the second operational amplifier U6B is connected to the inverting input end through resistors R11, R12 and capacitor C12, and the output end of the second operational amplifier U6B is connected to the control module through a resistor R10.

[0035] like Figure 4 As shown, the dry node output module includes a transistor Q1 and an electromagnet K1. The transistor Q1 receives a control signal from the control module and switches the on-off state between the dry nodes COM1 and COM2 by controlling the on-off of the electromagnet K1.

[0036] The base of transistor Q1 is connected to the control module through resistor R6, and the collector of transistor Q1 is connected to the first power supply voltage through electromagnet K1. Electromagnet K1 is connected between dry nodes COM1 and COM2. Dry nodes COM1 and COM2 are connected to terminal P3.

[0037] The first supply voltage is connected to the cathode of the diode D3, and the anode of the diode D3 is connected to the collector of the transistor Q1. The diode D3 in the dry node output module mainly plays the role of freewheeling protection.

[0038] In the technical solution of the present application, the fire linkage signal includes a dry node signal and a wet node signal. When the dry node signal is connected to the 1 and 2 pins of the wiring terminal P3, the two pins are turned on, and the current flows from the resistor R2 into the optocoupler U4, passes through the voltage regulator diode D4 and reaches GND, making the optocoupler U4 turned on.

[0039] The AD conversion module detects the voltage at the acquisition signal IN and amplifies it by 10 times through the first operational amplifier U6A and the second operational amplifier U6B. When the control module calculates that the voltage at the acquisition signal IN is greater than 4V, the control module sends a high-level signal to the base of the transistor Q1 to control the dry nodes COM1 and COM2 to be turned on, so that the external alarm module works.

[0040] When the 1st and 2nd pins of the wiring terminal P3 are not connected to the dry node signal, these two pins are disconnected, the optocoupler U4 cannot be turned on, and when the control module calculates that the voltage at the acquisition signal IN is less than 0.5V, the control module sends a low-level signal to the base of the transistor Q1, and controls the dry nodes COM1 and COM2 to be disconnected, so that the external alarm module stops working.

[0041] When the fire linkage signal is a wet node signal, the pin 1 of the wiring terminal P3 is connected to the negative electrode of the wet node signal, and the pin 2 of the wiring terminal P3 is connected to the positive electrode of the wet node signal. The current flows from the resistor R2 into the optocoupler U4, passes through the voltage regulator diode D4 and reaches GND, making the optocoupler U4 conductive.

[0042] The AD conversion module detects the voltage at the acquisition signal IN and amplifies it by 10 times through the first operational amplifier U6A and the second operational amplifier U6B. When the control module calculates that the voltage at the acquisition signal IN is greater than 4V, the control module sends a high-level signal to the base of the transistor Q1 to control the dry nodes COM1 and COM2 to be turned on, so that the external alarm module works.

[0043] When the 1st and 2nd pins of the wiring terminal P3 are not connected to the wet node signal, the optocoupler U4 cannot be turned on. When the control module calculates that the voltage at the acquisition signal IN is less than 0.5V, the control module sends a low-level signal to the base of the transistor Q1 to control the dry nodes COM1 and COM2 to be disconnected, so that the external alarm module stops working.

[0044] It can be seen from this that as long as pin 1 of terminal P3 is connected to the negative pole of the wet node signal and pin 2 of terminal P3 is connected to the positive pole of the wet node signal, the dry node signal and wet node signal output by the switch cabinet can be converted into dry node signals, so that they can be directly connected to the external alarm module.

[0045] The technical solution of the present application also includes an isolated power supply module for providing a first power supply voltage, a voltage stabilizing module connected to the isolated power supply module for providing a second power supply voltage, and an indication module connected to the control module.

[0046] like Figure 5 As shown, the isolated power supply module provides a first power supply voltage of 24V, which is used to power the dry and wet node acquisition module, the dry node output module and the voltage stabilizing module.

[0047] like Figure 6 As shown, the voltage stabilizing module provides a second power supply voltage of 5V for powering the control module, the dry and wet node acquisition module and the indication module.

[0048] like Figure 7 As shown, the indication module is provided with two paths, one for indicating the power supply status, and the other for indicating the on / off status between the dry nodes COM1 and COM2.

[0049] It is worth noting that the purpose of the technical solution of this application is only to provide a hardware configuration different from the prior art, so that technicians can achieve further development under such hardware configuration. As for the software program, it can be programmed by programmers in this field at a later stage according to actual effect requirements.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Low-voltage switch cabinet fire linkage intelligent control device, characterized by: It includes a control module, a dry-wet node acquisition module, an AD conversion module and a dry node output module. The dry-wet node acquisition module acquires the fire linkage signal of the switch cabinet and transmits the acquired signal to the AD conversion module. The AD conversion module amplifies the acquired signal and transmits the amplified signal to the control module. The control module switches the on-off state between the dry nodes through the dry node output module according to the amplified signal. The dry node is connected to the external alarm module; The dry and wet node acquisition module includes an optical coupler U4 and a wiring terminal P3, the input end of the optical coupler U4 is connected to the first power supply voltage through a resistor R2, and the input end of the optical coupler U4 is connected to the wiring terminal P3 through a voltage regulator diode D4; The output end of the optical coupler U4 is connected to the second power supply voltage through the resistor R3, and the output end of the optical coupler U4 is connected to the resistor R5; The AD conversion module includes a two-stage cascaded in-phase proportional circuit, and the AD conversion module includes a first operational amplifier U6A and a second operational amplifier U6B. The in-phase input terminal of the first operational amplifier U6A is connected to the acquisition signal IN of the output terminal of the optical coupler U4 through resistors R8 and R9, and the output terminal of the first operational amplifier U6A is connected to the inverting input terminal; The output end of the first operational amplifier U6A is connected to the non-inverting input end of the second operational amplifier U6B through a resistor R7, the output end of the second operational amplifier U6B is connected to the inverting input end through a resistor R11, a resistor R12, and a capacitor C12, and the output end of the second operational amplifier U6B is connected to the control module through a resistor R10; The dry node output module includes a transistor Q1 and an electromagnet K1. The transistor Q1 receives a control signal from the control module and switches the on-off state between the dry nodes COM1 and COM2 by controlling the on-off of the electromagnet K1.

2. The low-voltage switch cabinet fire linkage intelligent control device according to claim 1 is characterized in that: The base of the transistor Q1 is connected to the control module through the resistor R6, and the collector of the transistor Q1 is connected to the first power supply voltage through the electromagnet K1. The electromagnet K1 is connected between the dry nodes COM1 and COM2. The dry nodes COM1 and COM2 are connected to the wiring terminal P3.

3. The low-voltage switch cabinet fire linkage intelligent control device according to claim 2 is characterized in that: The first supply voltage is connected to the cathode of the diode D3, and the anode of the diode D3 is connected to the collector of the transistor Q1.

4. The low-voltage switch cabinet fire linkage intelligent control device according to any one of claims 1 to 3, characterized in that: It also includes an isolated power supply module for providing a first power supply voltage, a voltage stabilizing module connected to the isolated power supply module for providing a second power supply voltage, and an indicating module connected to the control module.

5. The low-voltage switch cabinet fire linkage intelligent control device according to claim 4 is characterized in that: The fire linkage signal includes a dry node signal and a wet node signal.

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