Direct-current low-voltage control device for controlling alternating-current 220V alarm equipment

Abstract

The utility model discloses a direct-current low-voltage control device for controlling alternating-current 220V alarm equipment. The direct-current low-voltage control device comprises a relay execution module, an infrared induction module and a temperature and humidity sensor, the input end of the comparator module is connected with the infrared induction module, and the output end of the comparator module is connected with the relay execution module; the input end of the MCU is connected with the temperature and humidity sensor, the output end of the MCU is connected with the input end of the relay driving module, and the MCU is used for judging whether the temperature and humidity value in the electric cabinet exceeds a threshold value or not so as to output a control instruction to the relay driving module; the output end of the relay driving module is connected with the relay execution module, and the relay driving module is used for driving on-off of the relay execution module according to the control instruction; according to the utility model, the monitoring and alarming effects on the cabinet door state and the temperature and humidity in the cabinet are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a DC low-voltage control technology, in particular to a DC low-voltage control device for controlling AC 220V alarm equipment. Background Art

[0002] Electrical cabinets are becoming increasingly advanced and intelligent, and are widely used in computer rooms and electrical control equipment. Because these control devices are typically high-voltage components or valuable mainframe computers, they place high demands on the environment within. Therefore, these cabinets are typically enclosed to protect against moisture, collisions, and electric shock, thus safeguarding both equipment and personnel. Currently, when the cabinet door is open, it cannot sound an alarm, creating a potential safety hazard. This can also alter the temperature and humidity within the cabinet. Furthermore, even when the cabinet door is closed, the temperature and humidity within the cabinet can still fluctuate. These changes can affect the performance and lifespan of the components or mainframes within the cabinet, posing a potential safety hazard. Therefore, monitoring and alarming of the temperature and humidity within the cabinet are essential. Utility Model Content

[0003] The technical problem to be solved by the utility model is: when the electric cabinet is opened, an alarm is issued on the state of the cabinet door; when the temperature and humidity inside the electric cabinet change, an alarm is issued on the temperature and humidity change, and a 220V alarm device is driven efficiently.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is: a DC low voltage control device for controlling AC 220V alarm equipment, comprising

[0005] Relay execution module, used to connect AC220V power supply and alarm equipment, and control the power on and off of the alarm equipment;

[0006] The infrared sensing module is used to generate a sensing signal for the status of the electrical cabinet door; when the cabinet door is open, the infrared sensing module is at a low level.

[0007] The comparator module has an input end connected to the infrared sensing module and an output end connected to the relay execution module; it is used to drive the relay execution module to turn on and off according to the change of the sensing signal;

[0008] Temperature and humidity sensor, used to collect temperature and humidity information inside the electrical cabinet;

[0009] The MCU, whose input end is connected to the temperature and humidity sensor, and whose output end is connected to the input end of the relay driver module, is used to determine whether the temperature and humidity values in the cabinet exceed the threshold value, thereby outputting a control instruction to the relay driver module;

[0010] The relay driver module has an output terminal connected to the relay execution module, and is used to drive the relay execution module to turn on and off according to the control instructions;

[0011] The power supply module is used to convert AC220V voltage into 5V and 12V DC and provide the required power for the control device.

[0012] Furthermore, the relay execution module is composed of two relays, the control ends of the two relays are respectively connected to the output end of the comparator module and the output end of the relay drive module, and the execution ends of the two relays are used to connect the AC220V power supply and the alarm device. The use of dual relays can realize independent control of the on and off of the alarm device.

[0013] Furthermore, the comparator module includes a comparator, a voltage reference circuit, and a voltage feedback circuit. The output of the voltage reference circuit is connected to the comparator's non-inverting input, the output of the voltage feedback circuit is connected to the comparator's inverting input, a resistor R6 is connected between the comparator's output and its power input, and the power module is connected to the comparator's power input. This allows for efficient relay control, with a simple structure and low cost. When the cabinet door is open, the infrared device outputs a low level, resulting in the output voltage of the voltage feedback circuit being lower than the voltage output of the voltage reference circuit. The comparator outputs a high-level signal, driving the relay to close, and the alarm device to power on and alarm. When the cabinet door is closed, the infrared device outputs a high-resistance state, the output voltage of the voltage feedback circuit is greater than the output voltage of the voltage reference circuit, and the comparator outputs a low-level signal. The voltage at the relay control terminal is low, the relay opens, and the alarm device is de-energized and operates.

[0014] Compared with existing technologies, the present invention offers the following advantages: 1. The infrared sensor module senses the status of the electrical cabinet door. When the door is open, the comparator module outputs a high-level signal, controlling the relay to close and triggering an alarm. 2. The temperature and humidity inside the electrical cabinet are monitored. Regardless of whether the cabinet door is open or closed, as long as the temperature and humidity inside the cabinet exceed a threshold, the alarm device can be independently controlled to sound an alarm. This invention boasts a simple circuit structure, low cost, and strong practicality. It effectively monitors the temperature and humidity conditions of the cabinet door and interior, protecting components and electrical equipment within the cabinet and preventing potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the circuit structure of the control device of the utility model. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, an electrical connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two components. The circuit unit mentioned in the present invention is a basic functional circuit module, which is a conventional technology or existing technology. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0017] For example 1, please refer to Figure 1 , a DC low voltage control device for controlling AC 220V alarm equipment, comprising

[0018] The relay actuator module is used to connect the AC220V power supply and alarm device L, controlling the power on and off of alarm device L. Specifically, the relay actuator module consists of two relays, K1 and K2. The control terminals of the two relays are connected to the output of the comparator module and the output of the relay driver module, respectively. The actuator terminals of the two relays are used to connect the AC220V power supply and alarm device L. Using two relays can achieve independent control of the power on and off of alarm device L. When the output of the comparator module and the relay driver module output a high level, the actuator terminal of the relay closes, the alarm device L is connected to the AC220V power supply, and then the alarm is triggered.

[0019] An infrared sensing module is used to generate a sensing signal based on the status of the electrical cabinet door. The infrared sensing module includes a pair of infrared transmitting probes and a resistor R1. Infrared transmitting probe S1 is connected in series with resistor R1, a power module is connected to resistor R1, and the common terminal of infrared receiving probe S2 and infrared transmitting probe S1 is grounded. Infrared receiving probe S2 is connected to the inverting input of a comparator. Infrared transmitting probe S1 and infrared receiving probe S2 are mounted above and below the cabinet door frame. When the cabinet door is closed, infrared receiving probe S2 receives no signal from infrared transmitting probe S1 and is disconnected, with its output in a high resistance state. The voltage at the inverting input of the comparator depends on the output voltage of the voltage feedback circuit.

[0020] A comparator module, whose input end is connected to the infrared sensing module and whose output end is connected to the relay execution module; is used to drive the relay execution module to turn on and off according to the change of the sensing signal; preferably, the comparator module includes a comparator, a voltage reference circuit and a voltage feedback circuit, the output end of the voltage reference circuit is connected to the comparator non-inverting input end, the output end of the voltage feedback circuit is connected to the comparator inverting input end, a resistor R6 is connected between the output end of the comparator and its power input end, and the power module is connected to the power input end of the comparator. More specifically, the voltage reference circuit includes a resistor R4, a resistor R5 and a capacitor C2, one end of the resistor R4 is connected to one end of the resistor R5, one end of the capacitor C2, and the non-inverting input end of the comparator, the other end of the resistor R4 is connected to the power module, and the other end of the resistor R5 and the other end of the capacitor C2 are used for grounding; the voltage feedback circuit includes a resistor R2, a resistor R3 and a capacitor C1, one end of the resistor R2 is connected to one end of the capacitor C1, one end of the resistor R3, the inverting input end of the comparator and the infrared sensing module, the other end of the resistor R2 is connected to the power module, and the other end of the capacitor C1 and the other end of the resistor R3 are used for grounding. When the cabinet door is closed, infrared receiver S2 is not conducting. The output voltage of the voltage feedback circuit is the voltage applied to resistor R3 after the voltage is divided by resistors R2 and R3. The output voltage of the voltage reference circuit is the voltage applied to resistor R5 after the voltage is divided by resistors R4 and R5. The resistance of resistor R3 is 0.5-1 times greater than the resistance of resistor R5. The output voltage of the voltage feedback circuit is higher than the output voltage of the voltage reference circuit. As a result, the input voltage of the inverting input of the comparator is higher than the voltage of the non-inverting input. The comparator outputs a low level, the relay execution module is disconnected, and the alarm device is not powered. When the cabinet door is opened, infrared receiver S2 receives the signal and conducts, thus outputting a low level. The input voltage of the inverting input of the comparator is low, and the input voltage of the inverting input of the comparator is lower than the voltage of the non-inverting input. The comparator outputs a high level, the relay execution module is closed, and the alarm device is powered.

[0021] Temperature and humidity sensor, used to collect temperature and humidity information inside the electrical cabinet;

[0022] The MCU, with its input connected to the temperature and humidity sensor and its output connected to the input of the relay driver module, determines whether the temperature and humidity values inside the cabinet exceed thresholds (for example, a temperature threshold of 50°C or a humidity threshold of 35%), and then outputs control instructions to the relay driver module. The MCU uses a 5V single-chip microcontroller, model STC12C5A60S2.

[0023] The relay driver module has an output end connected to the relay execution module, which is used to drive the relay execution module to turn on and off according to the control instruction; preferably, the relay driver module includes a resistor R7, a diode D1 and a transistor Q1, and the power module is connected to the control end of the relay execution module and the cathode of the diode D1; the anode of the diode D1 is connected to the control end of the relay execution module and the collector of the transistor Q1, the emitter of the transistor Q1 is used for grounding, the base of the transistor Q1 is connected to one end of the resistor R7, and the other end of the resistor R7 is connected to the output end of the MCU, and the power module provides power to the MCU. When the MCU determines that the temperature and humidity values in the electrical cabinet exceed the threshold value, it outputs a high level, and the transistor Q1 is turned on, thereby turning on the relay driver module. The diode D1 serves to prevent the reverse voltage impact circuit in the relay after power failure.

[0024] The power module converts 220V AC to 5V and 12V DC, providing power to the control devices. The 12V power supply powers the infrared sensor module, comparator module, and relay driver module, while the 5V power supply powers the MCU and temperature and humidity sensor. This power module can use a common power supply circuit, such as one based on the 5.0V AMS1117 voltage regulator chip, to convert 220V AC power to +5V.

[0025] In the utility model, the circuit structure is simple, the cost is low, and the practicability is strong. The temperature and humidity conditions of the cabinet door and the cabinet can be effectively monitored to protect the components and electrical equipment in the cabinet and avoid potential safety hazards.

[0026] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of this module.

[0027] The above describes an embodiment of the present invention in detail. However, the above content is only a preferred embodiment of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent application of the present invention.

Claims

1. A DC low voltage control device for controlling an AC 220V alarm device, characterized in that: It includes a relay execution module, which is used to connect the AC220V power supply and the alarm device to control the power on and off of the alarm device; Infrared sensing module, used to generate sensing signals for the status of the electrical cabinet door; A comparator module, whose input end is connected to the infrared sensing module, and whose output end is connected to the relay execution module; Used to drive the relay execution module on and off according to the change of the sensing signal; Temperature and humidity sensor, used to collect temperature and humidity information inside the electrical cabinet; The MCU, whose input end is connected to the temperature and humidity sensor, and whose output end is connected to the input end of the relay driver module, is used to determine whether the temperature and humidity values in the cabinet exceed the threshold value, thereby outputting a control instruction to the relay driver module; The relay driver module has an output terminal connected to the relay execution module, and is used to drive the relay execution module to turn on and off according to the control instructions; The power supply module is used to convert AC220V voltage into 5V and 12V DC and provide the required power for the control device.

2. A DC low voltage control device for controlling an AC 220V alarm device according to claim 1, characterized in that: The relay execution module consists of two relays, the control ends of the two relays are respectively connected to the output end of the comparator module and the output end of the relay drive module, and the execution ends of the two relays are used to connect to the AC220V power supply and the alarm device.

3. A DC low voltage control device for controlling an AC 220V alarm device according to claim 1, characterized in that: The comparator module includes a comparator, a voltage reference circuit and a voltage feedback circuit. The output end of the voltage reference circuit is connected to the non-inverting input end of the comparator, the output end of the voltage feedback circuit is connected to the inverting input end of the comparator, a resistor R6 is connected between the output end of the comparator and its power input end, and the power module is connected to the power input end of the comparator.

4. A DC low voltage control device for controlling an AC 220V alarm device as claimed in claim 3, characterized in that: The voltage reference circuit includes a resistor R4, a resistor R5 and a capacitor C2, one end of the resistor R4 is connected to one end of the resistor R5, one end of the capacitor C2, and the non-inverting input end of the comparator, the other end of the resistor R4 is connected to the power module, and the other end of the resistor R5 and the other end of the capacitor C2 are used for grounding; the voltage feedback circuit includes a resistor R2, a resistor R3 and a capacitor C1, one end of the resistor R2 is connected to one end of the capacitor C1, one end of the resistor R3, the inverting input end of the comparator and the infrared sensing module, the other end of the resistor R2 is connected to the power module, and the other end of the capacitor C1 and the other end of the resistor R3 are used for grounding.

5. A DC low voltage control device for controlling an AC 220V alarm device as claimed in claim 4, characterized in that: The infrared sensing module includes a pair of infrared emitting probes and a resistor R1, wherein the infrared emitting probe S1 is connected in series with the resistor R1, the power supply module is connected to the resistor R1, the common end of the infrared receiving probe S2 and the infrared emitting probe S1 is used for grounding, and the infrared receiving probe S2 is connected to the inverting input end of the comparator.

6. A DC low voltage control device for controlling an AC 220V alarm device as claimed in claim 5, characterized in that: The relay drive module includes a resistor R7, a diode D1 and a transistor Q1. The power module is connected to the control end of the relay execution module and the cathode of the diode D1; the anode of the diode D1 is connected to the control end of the relay execution module and the collector of the transistor Q1, the emitter of the transistor Q1 is used for grounding, the base of the transistor Q1 is connected to one end of the resistor R7, and the other end of the resistor R7 is connected to the output end of the MCU. The power module provides power to the MCU.

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