Fusion circuit and method for machine room point location acquisition

Abstract

The invention relates to the technical field of air conditioner control, in particular to a fusion circuit and method for machine room point position collection, and the circuit comprises an indicator light state obtaining unit, a first photoelectric coupler U1 is provided with a first pin PI N1 at the output end and used for being connected with a processor, and the input end is connected with the direct current output end of a rectifier bridge D1; the alternating-current input end of the rectifier bridge D1 is connected with two ends of a to-be-detected point through a detection line; the output end of a second photoelectric coupler U2 is provided with a second pin PI N2 used for being connected with a processor, the anode input end of the second photoelectric coupler U2 is connected with an isolation power supply VCC2 and then is connected with one detection line through a first relay S1, and the cathode input end of the second photoelectric coupler U2 is connected with the other detection line through a second relay S2; the first pin PI N1 provides a level signal to control the first relay S1 and the second relay S2 to be opened and closed through the relay control circuit; the circuit is designed from the button and the indicating lamp, the button state and the indicating lamp state are obtained, and then the process of analyzing and transforming a cabinet in an existing method is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning control, and in particular to a fusion circuit and method for collecting points in a computer room. Background Art

[0002] The cold station (water-cooled central air-conditioning room) contains various components for the operation of the air-conditioning system, mainly including chillers, cooling water circulation pumps, chilled water circulation, cooling towers, water collectors, water distributors, electric regulating valves and other basic components. The various components in the cold station need to work together to ensure that the chilled water produced by the chiller is delivered to the room to achieve a cooling effect. The system that controls the linkage of these components can be called room group control, which is a wide application field of the Internet of Things in the future.

[0003] For cold stations without machine room group control, manual management is generally used. When starting up, the circulating water pump is manually turned on first to ensure the water circulation inside the pipe. After waiting for a period of time, the chiller is turned on to cool the cooling water inside the pipe, thereby starting the entire system. If the operation sequence of the equipment is wrong, it may cause damage to the equipment. For example, if the chiller is turned on first without turning on the cooling water pump, the cold water generated by the chiller is not taken away, which may cause ice and other damage to the equipment. Therefore, for systems with machine room group control, normal system startup and shutdown, safety protection, and timed power on and off functions can be achieved.

[0004] Computer room group control generally has high requirements for equipment. For newly built cold stations, if you want to configure computer room group control, you need to customize a special computer room group control cabinet and configure the external output interface separately.

[0005] For cold stations that have already been built, it is very complicated to add a new computer room group control system. The existing renovation plan requires the renovation of the original control cabinet. First, it is necessary to determine the wiring structure of the original control cabinet and analyze and restore the wiring schematic diagram of the original control. Since the design drawings of most projects are difficult to find, the process is extremely complicated. After the analysis is clear, the analyzed line schematic diagram is redesigned, and external interfaces are added through the secondary circuit. For example, for the water pump control cabinet, the original external output points such as turning on the water pump, turning off the water pump, water pump failure, manual and automatic status are added. After the cabinet renovation is completed, these points are connected to the PLC, and the water pump control and status detection are realized in the PLC. The whole process is very complicated and involves the renovation of the original equipment. Summary of the invention

[0006] The purpose of the present invention is to provide a fusion circuit and method for collecting points in a computer room. The present invention designs a fusion circuit for collecting points in a computer room starting from buttons and indicator lights, which can realize the acquisition of button status and indicator light status, thereby avoiding the process of analyzing and modifying the cabinet in the existing method. In order to achieve the above purpose, the present invention solves it through the following technical solutions:

[0007] In a first aspect, the present invention provides a fusion circuit for collecting data from computer room points, including:

[0008] The indicator light state acquisition unit includes a rectifier bridge D1 and a first photocoupler U1, wherein the output end of the first photocoupler U1 is provided with a first pin PIN1 for connecting to a processor, and the input end is connected to the DC output end of the rectifier bridge D1, and the AC input end of the rectifier bridge D1 is connected to both ends of a point to be detected through a detection line;

[0009] A switch state acquisition unit includes an isolated power supply VCC2, a second photocoupler U2, a first relay S1, a second relay S2 and a relay control circuit, wherein the output end of the second photocoupler U2 is provided with a second pin PIN2 for connecting to the processor, an anode input end is connected to the isolated power supply VCC2 and then connected to one of the detection lines through the first relay S1, and a cathode input end is connected to another detection line through the second relay S2; the first pin PIN1 provides a level signal to control the opening and closing of the first relay S1 and the second relay S2 through the relay control circuit.

[0010] As a further technical solution, the point to be detected is an indicator light, when the light is on, the first pin PIN1 is at a low level, and when the light is off, the first pin PIN1 is at a high level; the point to be detected is a passive switch, when closed, the second pin PIN2 is at a low level, and when disconnected, the second pin PIN2 is at a high level; the point to be detected is an active switch, when closed, the second pin PIN2 is at a low level, and when disconnected, the first pin PIN1 is at a low level and controls the first relay S1 and the second relay S2 to be disconnected, and the second pin PIN2 is at a high level.

[0011] As a further technical solution, the relay control circuit includes a first MOS tube Q1, a second MOS tube Q2 and a power supply VCC1; the low-level signal provided by the first pin PIN1 drives the second MOS tube Q2 to turn on after being inverted into a high-level signal by the first MOS tube Q1, thereby turning on the relay control circuit and controlling the first relay S1 and the second relay S2 to be disconnected.

[0012] As a further technical solution, the first pin PIN1 is connected to the gate of the first MOS tube Q1 serving as an inverter, the drain of the first MOS tube Q1 is connected to the gate of the second MOS tube Q2, the sources of the first MOS tube Q1 and the second MOS tube Q2 are both grounded, and one side of the relay controller of the first relay S1 and the second relay S2 is connected to the power supply VCC1, and the other side is connected to the drain of the second MOS tube Q2.

[0013] As a further technical solution, an eighth resistor R34 is provided between the second relay S2 and the detection line, and the eighth resistor R34 is a PTC thermistor; and a bidirectional TVS tube D2 is connected in parallel to the isolation power supply VCC2.

[0014] As a further technical solution, a first capacitor C1, a first resistor R21 and a second capacitor C2 are connected in parallel between the rectifier bridge D1 and the first photocoupler U1 circuit.

[0015] As a further technical solution, the light-emitting end of the first photocoupler U1 is a light-emitting diode, the light-receiving end is an NPN photosensitive transistor, and its base is grounded through a third resistor R23, the emitter is grounded, and the collector is connected to the power supply through a fourth resistor R24.

[0016] As a further technical solution, the isolated power supply VCC2 is connected to the second photocoupler U2 via a fifth resistor R31.

[0017] As a further technical solution, the light-emitting end of the second photocoupler U2 is a light-emitting diode, the light-receiving end is an NPN photosensitive transistor, and its base is grounded through the seventh resistor R33, the emitter (pin 4) is grounded, and the collector is connected to the power supply through the sixth resistor R32.

[0018] In a second aspect, the present invention provides a method for detecting the operating status of a cold station room, comprising the following steps:

[0019] The indicator lights, active switches and passive switches of the equipment in the cold station room are used as the points to be detected for obtaining the operating status. The user sets the processor to the type of the point to be detected connected to the fusion circuit detection line for collecting points in the room as described in the first aspect; if it is an indicator light, the on and off state of the light is obtained; if it is an active switch or a passive switch, the on and off state of the switch is obtained; the state acquisition process is:

[0020] If the point to be detected is an indicator light, the first pin PIN1 is at a low level when the light is on, and at a high level when the light is off;

[0021] If the point to be detected is a passive switch, the second pin PIN2 is at a low level when closed, and at a high level when open;

[0022] If the point to be detected is an active switch, the second pin PIN2 is at a low level when closed, and the first pin PIN1 is at a low level and controls the first relay S1 and the second relay S2 to be disconnected when opened, and the second pin PIN2 is at a high level.

[0023] The beneficial effects of the present invention are as follows:

[0024] (1) The present invention designs a fusion circuit for collecting information from computer room points starting from buttons and indicator lights, which can realize the acquisition of button status and indicator light status, thereby avoiding the process of analyzing and modifying the cabinet in the existing method, which can greatly save on-site construction time and reduce manpower and material costs.

[0025] (2) The circuit of the present invention can fully meet the compatibility access requirements for indicator lights, active switches and passive switches in the industrial field by combining certain user configurations, and realizes all functions through two terminals, which greatly facilitates the on-site point collection process and improves construction efficiency.

[0026] (3) The circuit of the present invention has linkage protection logic inside. By utilizing the first pin PIN1 signal and the cooperation of the MOS tube, the first relay and the second relay can be controlled to be disconnected, so that the first pin PIN1 signal can be used as both a detection signal of the indicator light and a protection signal of the switch, thereby realizing stable operation of the circuit.

[0027] (4) Since the first pin PIN1 is a signal generated by rectification and filtering, the signal state change time is relatively long. In the present invention, the protection of the isolated power supply VCC2 is performed through a bidirectional TVS tube and a PTC resistor to ensure that the isolated power supply VCC2 is not damaged during the hysteresis process of the state change of the first pin PIN1. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their description are used to explain the present invention and do not constitute a limitation of the present invention. It should also be understood that these drawings are shown for simplicity and clarity and are not necessarily drawn to scale. The present invention will now be described and explained with additional features and details through the use of the accompanying drawings, in which:

[0029] Figure 1 The fusion circuit diagram for data collection in the computer room according to the embodiment of the present invention is shown;

[0030] Figure 2 A schematic diagram of the on / off detection point of the indicator light in an embodiment of the present invention is shown;

[0031] Figure 3 A schematic diagram of the active switch opening and closing detection points in an embodiment of the present invention is shown;

[0032] Figure 4 A schematic diagram of the passive switch opening and closing detection points in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0033] The technical solutions in typical embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] For cold stations that do not have a computer room group control system installed, all equipment is generally controlled manually, and the status of the equipment is prompted by indicator lights. Buttons and indicator lights are minimal components that all cold station cabinets have.

[0035] The present invention starts with buttons and indicator lights. The points that need to be collected and controlled in the field of industrial control mainly include indicator lights, active switches and passive switches (passive dry contacts). The original circuits and detection points are as follows: Figure 2 , Figure 3 and Figure 4 shown.

[0036] like Figure 2 As shown in the figure, the indicator light is turned on and off when the switch is closed, and the indicator light is turned off when the switch is opened. The black circles on the right are the wiring terminals at both ends of the indicator light.

[0037] like Figure 3 As shown, this is to detect the closing status of the active switch. When the active switch is closed, the coil is energized, and when the active switch is opened, the coil is de-energized. The black circles on the right are the wiring terminals at both ends of the active switch.

[0038] like Figure 4 The figure shows a passive switch, and the black circles on the right are the wiring terminals at both ends of the passive switch.

[0039] like Figure 1 As shown, this embodiment provides a fusion circuit for data acquisition in a computer room, including an indicator light status acquisition unit and a switch status acquisition unit.

[0040] The indicator light state acquisition unit includes a rectifier bridge D1 and a first photocoupler U1. The output end of the first photocoupler U1 is provided with a first pin PIN1 for connecting to a processor, and the input end is connected to the DC output end of the rectifier bridge D1. The AC input end of the rectifier bridge D1 is connected to both ends of the point to be detected through a detection line. In this embodiment, the processor selects MCU. It can be understood that in some other embodiments, it is not limited to the selection method of this embodiment, and other types of processors can also be selected.

[0041] Specifically, the light-emitting end of the first photocoupler U1 is a light-emitting diode, and the light-receiving end is an NPN phototransistor. The DC output end of the rectifier bridge D1 is respectively connected to the anode (pin 1) and cathode (pin 2) of the light-emitting diode in the first photocoupler U1.

[0042] A first capacitor C1, a first resistor R21 and a second capacitor C2 are connected in parallel between the rectifier bridge D1 and the first photocoupler U1 circuit, and the anode (pin 1) of the light emitting diode is connected by setting a second resistor R22.

[0043] The base (pin 6) of the NPN phototransistor is grounded through the third resistor R23, the emitter (pin 4) is grounded, and the collector (pin 5) is connected to the 5V power supply VCC1 through the fourth resistor R24. The first pin PIN1 is used as a level signal output pin.

[0044] When the point to be detected is an indicator light, the detection point is connected in parallel at both ends of the indicator light. When the indicator light is on, there is a potential difference at both ends of the detection point. After filtering by the rectifier bridge D1 and the capacitor, the first photocoupler U1 is turned on, and the first pin PIN1 is at a low level. When the indicator light is off, there is no potential difference at both ends of the indicator light, the first photocoupler U1 is not turned on, and the first pin PIN1 is at a high level.

[0045] The switch state acquisition unit includes an isolated power supply VCC2, a second photocoupler U2, a first relay S1, a second relay S2 and a relay control circuit.

[0046] The output end of the second photocoupler U2 is provided with a second pin PIN2 for connecting to the processor; the anode input end is connected to the isolated power supply VCC2 and then connected to one of the detection lines through the first relay S1; the cathode input end is connected to the other detection line through the second relay S2; the first pin PIN1 provides a level signal to control the opening and closing of the first relay S1 and the second relay S2 through the relay control circuit.

[0047] The first relay S1 and the second relay S2 can isolate this part of the circuit from the two detection points. The isolated power supply VCC2 is an independent isolated power supply. When the detection points are connected to both ends of the 220V active switch and the switch is closed, the isolated power supply VCC2 can provide an additional potential difference.

[0048] The 5V isolated power source VCC2 is connected to the second photocoupler U2 via the fifth resistor R31.

[0049] The light-emitting end of the second photocoupler U2 is a light-emitting diode, and the light-receiving end is an NPN photosensitive transistor, and its base (pin 6) is grounded through the seventh resistor R33, the emitter (pin 4) is grounded, and the collector (pin 5) is connected to the 5V power supply VCC1 through the sixth resistor R32.

[0050] The relay control circuit includes a first MOS tube Q1, a second MOS tube Q2 and a power supply VCC1; the low-level signal provided by the first pin PIN1 drives the second MOS tube Q2 to turn on after being inverted into a high-level signal by the first MOS tube Q1, thereby turning on the relay control circuit and controlling the first relay S1 and the second relay S2 to be disconnected.

[0051] The first pin PIN1 is connected to the gate of the first MOS tube Q1 as an inverter, the drain of the first MOS tube Q1 is connected to the gate of the second MOS tube Q2, the sources of the first MOS tube Q1 and the second MOS tube Q2 are both grounded, and one side of the relay controller of the first relay S1 and the second relay S2 is connected to the 5V power supply VCC1, and the other side is connected to the drain of the second MOS tube Q2.

[0052] If the point to be detected is an active switch or a passive switch, the second pin PIN2 is at a low level when the switch is closed, and the second pin PIN2 is at a high level when the switch is opened.

[0053] If it is a passive switch, after the switch is closed, the isolated power supply VCC2 provides current, the second photocoupler U2 is turned on, and the second pin PIN2 outputs a low level; if the switch is opened, the second photocoupler U2 is not turned on, and the second pin PIN2 outputs a high level.

[0054] If it is an active switch, when the switch is closed, the potentials at the two positions of the detection point are equal, and the isolated power supply VCC2 provides a 5V potential difference. At this time, the second photocoupler U2 is turned on, and the second pin PIN2 outputs a low level; when the switch is disconnected, there is a large voltage difference at both ends of the detection point. At this time, the first pin PIN1 is at a low level. The first pin PIN1 is connected to the first MOS tube Q1, and the low level signal of the first pin PIN1 is reversed to a high level, thereby controlling the first relay S1 and the second relay S2 to be disconnected, and the entire 5V isolated power supply VCC2 is isolated from the strong electricity. At this time, the second photocoupler U2 is not turned on, and the second pin PIN2 outputs a high level.

[0055] Finally, when the switch is selected, the second pin PIN2 is at a low level when the switch is closed, and the second pin PIN2 is at a high level when the switch is opened.

[0056] An eighth resistor R34 is provided between the second relay S2 and the detection line, and the eighth resistor R34 is a PTC thermistor; a bidirectional TVS tube D2 is connected in parallel to the isolation power supply VCC2.

[0057] The eighth resistor R34 and the bidirectional TVS tube D2 form a protection circuit. Once the voltage across the detection point is high, the bidirectional TVS tube D2 is turned on. The eighth resistor R34 is a thermistor. The large current generated by the bidirectional TVS tube D2 turning on will double the resistance of the eighth resistor R37, thereby achieving the purpose of protecting the subsequent power supply.

[0058] Since the first pin PIN1 is a signal generated by rectification and filtering, the signal state change time is relatively long, so the protection of the isolated power supply VCC2 can be performed through a bidirectional TVS tube and a PTC resistor to ensure that the isolated power supply VCC2 is not damaged during the hysteresis process of the state change of the first pin PIN1.

[0059] Embodiment 2

[0060] This embodiment provides a method for detecting the operating status of a cold station room, comprising the following steps:

[0061] The indicator lights, active switches and passive switches of the equipment in the cold station room are used as the points to be detected for obtaining the operating status. The user sets the type of the point to be detected connected to the fusion circuit detection line for room point acquisition as described in the first embodiment for the processor; if it is an indicator light, the on and off state of the light is obtained; if it is an active switch or a passive switch, the on and off state of the switch is obtained; the state acquisition process is:

[0062] If the point to be detected is an indicator light, the first pin PIN1 is at a low level when the light is on, and at a high level when the light is off;

[0063] If the point to be detected is a passive switch, the second pin PIN2 is at a low level when closed, and at a high level when open;

[0064] If the point to be detected is an active switch, the second pin PIN2 is at a low level when closed, and the first pin PIN1 is at a low level and controls the first relay S1 and the second relay S2 to be disconnected when opened, and the second pin PIN2 is at a high level.

[0065] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A fusion circuit for data collection in a computer room, characterized in that: include: The indicator light state acquisition unit includes a rectifier bridge D1 and a first photocoupler U1, wherein the output end of the first photocoupler U1 is provided with a first pin PIN1 for connecting to a processor, and the input end is connected to the DC output end of the rectifier bridge D1, and the AC input end of the rectifier bridge D1 is connected to both ends of a point to be detected through a detection line; A switch state acquisition unit includes an isolated power supply VCC2, a second photocoupler U2, a first relay S1, a second relay S2 and a relay control circuit, wherein the output end of the second photocoupler U2 is provided with a second pin PIN2 for connecting to the processor, an anode input end is connected to the isolated power supply VCC2 and then connected to one of the detection lines through the first relay S1, and a cathode input end is connected to another detection line through the second relay S2; the first pin PIN1 provides a level signal to control the opening and closing of the first relay S1 and the second relay S2 through the relay control circuit.

2. A fusion circuit for collecting data from computer room points as claimed in claim 1, characterized in that: The point to be detected is an indicator light. When the light is on, the first pin PIN1 is at a low level, and when the light is off, the first pin PIN1 is at a high level; the point to be detected is a passive switch. When it is closed, the second pin PIN2 is at a low level, and when it is disconnected, the second pin PIN2 is at a high level; the point to be detected is an active switch. When it is closed, the second pin PIN2 is at a low level, and when it is disconnected, the first pin PIN1 is at a low level and controls the first relay S1 and the second relay S2 to be disconnected, and the second pin PIN2 is at a high level.

3. A fusion circuit for collecting data from computer room points as described in claim 2, characterized in that: The relay control circuit includes a first MOS transistor Q1, a second MOS transistor Q2 and a power supply VCC1; the low-level signal provided by the first pin PIN1 drives the second MOS transistor Q2 to turn on after being inverted into a high-level signal by the first MOS transistor Q1, thereby turning on the relay control circuit and controlling the first relay S1 and the second relay S2 to be disconnected.

4. A fusion circuit for collecting data from computer room points as claimed in claim 3, characterized in that: The first pin PIN1 is connected to the gate of the first MOS transistor Q1 as an inverter, the drain of the first MOS transistor Q1 is connected to the gate of the second MOS transistor Q2, the sources of the first MOS transistor Q1 and the second MOS transistor Q2 are both grounded, and one side of the relay controller of the first relay S1 and the second relay S2 is connected to the power supply VCC1, and the other side is connected to the drain of the second MOS transistor Q2.

5. A fusion circuit for collecting data from computer room points as claimed in claim 4, characterized in that: An eighth resistor R34 is provided between the second relay S2 and the detection line, and the eighth resistor R34 is a PTC thermistor; a bidirectional TVS tube D2 is connected in parallel to the isolation power supply VCC2.

6. The fusion circuit for collecting data from computer room points as claimed in claim 1, characterized in that: A first capacitor C1 , a first resistor R21 , and a second capacitor C2 are connected in parallel between the rectifier bridge D1 and the first photocoupler U1 .

7. The fusion circuit for collecting data from computer room points as claimed in claim 1, characterized in that: The light-emitting end of the first photocoupler U1 is a light-emitting diode, the light-receiving end is an NPN-type photosensitive transistor, and the base is grounded through a third resistor R23, the emitter is grounded, and the collector is connected to the power supply through a fourth resistor R24.

8. The fusion circuit for collecting data from computer room points as claimed in claim 1, characterized in that: The isolated power source VCC2 is connected to the second photocoupler U2 via a fifth resistor R31.

9. The fusion circuit for collecting data from computer room points as claimed in claim 1, characterized in that: The light-emitting end of the second photocoupler U2 is a light-emitting diode, the light-receiving end is an NPN-type photosensitive transistor, and the base is grounded through the seventh resistor R33, the emitter is grounded, and the collector is connected to the power supply through the sixth resistor R32.

10. A method for detecting the operating status of a cold station room, characterized in that: The following steps are involved: The indicator lights, active switches and passive switches of the equipment in the cold station room are used as the points to be detected for obtaining the operating status. The user sets the processor to the type of the point to be detected connected to the fusion circuit detection line for collecting points in the room as described in any one of claims 1 to 9; if it is an indicator light, the on and off state of the light is obtained; if it is an active switch or a passive switch, the on and off state of the switch is obtained; the state acquisition process is: If the point to be detected is an indicator light, the first pin PIN1 is at a low level when the light is on, and at a high level when the light is off; If the point to be detected is a passive switch, the second pin PIN2 is at a low level when closed, and the second pin PIN2 is at a high level when open; If the point to be detected is an active switch, the second pin PIN2 is at a low level when closed, and the first pin PIN1 is at a low level and controls the first relay S1 and the second relay S2 to be disconnected when opened, and the second pin PIN2 is at a high level.

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