Split type dew point detection system

Abstract

The utility model relates to a split type dew point detection system which comprises an execution end and a dew point detection sensor. The execution end comprises a single-chip microcomputer which is connected with the dew point detection sensor; the relay array unit is connected with the single chip microcomputer and the execution mechanism; a communication unit; the temperature controller is connected with the single chip microcomputer and an external temperature controller panel; the dew point detection sensor adopts a temperature and humidity sensor. According to the utility model, a split type dew point detection design is adopted, and the dew point detection sensor is separated from the controller, so that the requirement that the panel is convenient to operate and control is met, and the requirements that the dew point sensor can be better attached to the ground, the dew point temperature of the ground is accurately detected and the ground is effectively prevented from being dewed are met. Therefore, the effect of protecting the ground from condensation during ground refrigeration work is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of dew point detection technology, specifically relating to a split-type dew point detection system. Background Technology

[0002] While current thermostats have dew point detection capabilities, they are typically designed as a single unit. Because the thermostat is usually installed at a certain height from the ground, the sensor cannot make good contact with the ground. As a result, the detected dew point temperature deviates from the actual dew point temperature of the ground, and the thermostat cannot accurately reflect the ground's dew point temperature in a timely manner. Consequently, it cannot perform a series of necessary controls in a timely and accurate manner to ensure that the ground does not condense. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a split-type dew point detection system. This system employs a split-type dew point detection design, separating the dew point sensor from the controller. This allows the dew point sensor to better conform to the ground, accurately detect the ground's dew point temperature, and effectively prevent condensation on the ground.

[0004] The technical solution adopted by this utility model to achieve the above objectives is: a split dew point detection system, including an execution end and a dew point detection sensor;

[0005] The execution end includes:

[0006] A microcontroller is connected to a dew point detection sensor.

[0007] The relay array unit is connected to the microcontroller and the actuator;

[0008] Communication unit; connects to the microcontroller and the external temperature controller panel;

[0009] The dew point detection sensor is a temperature and humidity sensor.

[0010] The dew point detection sensor includes a temperature and humidity sensor chip, a resistor, and a capacitor;

[0011] The power supply terminal of the temperature and humidity sensor chip is connected to the power supply through resistor R16. The power supply is connected to the first sensor data terminal SCL through resistor R17 and to the second sensor data terminal SDA through resistor R18. It is also connected to the ground terminal of the temperature and humidity sensor chip through capacitor C12.

[0012] The first sensor data terminal SCL and the second sensor data terminal SDA are connected to the microcontroller.

[0013] The relay array unit includes a fan control circuit;

[0014] The fan control circuit includes a fan relay and a transistor Q1 connected thereto;

[0015] The normally open contact of the fan relay is connected to the fan control terminal, one end of the coil is connected to the power supply, and the other end is connected to the collector of transistor Q1; a first diode is connected in parallel with the coil.

[0016] The base of transistor Q1 is connected to the first I / O port of the microcontroller through resistor R12, and the emitter is grounded. It is also connected to the first I / O port of the microcontroller through resistor R13.

[0017] The relay array unit includes a valve control circuit:

[0018] The valve control circuit includes a valve relay and a transistor Q1 connected thereto;

[0019] The normally open contact of the valve relay is connected to the valve control terminal, one end of the coil is connected to the power supply, the other end is connected to the collector of transistor Q4, and it is also connected to the power supply through a second diode.

[0020] The base of the transistor Q4 is connected to the second I / O port of the microcontroller through resistor R15, and the emitter is grounded and also connected to the second I / O port of the microcontroller through resistor R19.

[0021] The power supply unit includes:

[0022] The first input terminal L of the power supply unit is connected to the first input terminal of the rectifier bridge BD1 in sequence through resistors FR1 and RV1, and the node between resistors FR1 and RV1 is connected to the second input terminal of the rectifier bridge.

[0023] The second input terminal N of the power supply unit is connected to the first input terminal of the rectifier bridge, the second output terminal of the rectifier bridge is connected to the A terminal of the first primary coil of the transformer, and the first output terminal of the rectifier bridge is connected to the A terminal of the first primary coil through capacitor C1.

[0024] The current detection pin CS of the isolated primary-side feedback chip U1 is grounded through resistor R1. The intelligent power pin SW of U1 is connected to the A terminal of the first primary coil of the transformer through diodes D2 and D1, and is directly connected to the B terminal of the first primary coil of the transformer. The feedback pin FB of U1 is connected to the two ends of the second primary coil of the transformer through resistors R3 and R4. The B terminal of the second primary coil is connected to the voltage input pin VDD of U1 through capacitor C2. The A terminal of the second primary coil is connected to the voltage input pin VDD of U1 through resistor R2 and diode D3. A capacitor C3 is connected between the feedback pin FB of U1 and the B terminal of the second primary coil.

[0025] The A terminal of the transformer secondary coil outputs a 5V voltage through diode D9, which serves as the power supply voltage; the B terminal of the transformer secondary coil is grounded, and the output terminal of diode D9 is grounded through capacitor C4 and resistor R5 respectively.

[0026] The distance between the dew point detection sensor and the surface to be measured is at least 10 cm.

[0027] The actuator and the dew point detection sensor are each equipped with a housing.

[0028] This utility model has the following beneficial effects and advantages:

[0029] 1. This utility model adopts a split dew point detection design, separating the dew point sensor from the controller. This ensures both convenient operation and control via the panel, and allows the dew point sensor to better conform to the ground, accurately detecting the dew point temperature and effectively preventing condensation. This significantly improves the effectiveness of preventing condensation on the ground during refrigeration.

[0030] 2. This utility model uses a temperature and humidity sensor, which can improve the accuracy of dew point temperature detection through relevant data correction.

[0031] 3. This utility model uses a relay array unit, and a microcontroller automatically controls the opening and closing of the fan and valve based on the feedback from the dew point detection sensor to ensure that the ground does not condense.

[0032] 4. This utility model adopts a power supply unit to provide a stable 5V voltage to all other active components such as the microcontroller, relay array unit, temperature and humidity sensor, and communication unit, ensuring stable power supply and normal operation. Attached Figure Description

[0033] Figure 1 This is a general structural block diagram of the present invention;

[0034] Figure 2 This is the circuit diagram of a dew point detection sensor;

[0035] Figure 3 This is the circuit diagram of the power supply unit;

[0036] Figure 4a It is the fan control circuit in the relay array unit. Figure 1 ;

[0037] Figure 4b It is the fan control circuit in the relay array unit. Figure 2 ;

[0038] Figure 5a It is the valve control circuit in the relay array unit. Figure 1 ;

[0039] Figure 5b It is the valve control circuit in the relay array unit. Figure 2 ;

[0040] Figure 5c It is the valve control circuit in the relay array unit. Figure 3 ;

[0041] Figure 6 This is a pin diagram of a microcontroller circuit. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0043] like Figure 1 As shown, this utility model is a split-type dew point detection temperature controller system, which consists of a temperature controller panel, an actuator, and a dew point detection unit.

[0044] The temperature controller panel consists of a display unit, a 485 communication unit, a touch button unit, a buzzer unit, and a microcontroller minimum system. It displays and processes data, then transmits the processed data to the actuator via the 485 communication unit, thereby achieving the purpose of controlling the actuator.

[0045] The actuator unit consists of a power supply unit, a microcontroller minimum system, a relay array unit, a RS-485 communication unit, and a dew point detection probe receiving unit. The power supply unit converts 220V AC to 5V DC to power the actuator, temperature and humidity sensors, and the thermostat panel. The relay array unit controls the low, medium, and high fan speeds of the valve and fan. The RS-485 communication unit facilitates data transmission between the actuator and the thermostat panel. The dew point probe receiving unit transmits and receives data via IIC communication. The microcontroller minimum system receives and processes the data from the dew point probe, performs calculations to obtain temperature and humidity data, and then transmits this data to the RS-485 communication unit. The RS-485 communication unit then transmits the relevant data to the thermostat panel and receives and processes the information returned by the panel, thereby controlling the relay array unit to perform the corresponding actions.

[0046] Dew point detection unit: A separate design, using an external data acquisition method. Equipped with temperature and humidity sensors, it transmits the detected data to the actuator for reception. After processing by the temperature controller panel, the dew point temperature is obtained. Calculating the dew point temperature based on temperature and humidity is existing technology. An AHT20 sensor is used as the core component for temperature and humidity acquisition. External anti-interference devices ensure stable sensor operation and communication. The acquired temperature and humidity data is transmitted to the actuator via IIC communication.

[0047] By separating the dew point sensor from the actuator, a split-type design is achieved. This ensures that the normal operation of the thermostat panel and actuator is not affected, while accurately detecting the dew point temperature of the ground. The thermostat panel then controls the actuator to perform necessary actions based on the dew point temperature, achieving optimal cooling without condensation on the ground. This split-type design offers higher precision, providing more accurate and better reflection of the ground dew point condition.

[0048] like Figure 2 As shown, the dew point sensor circuit uses the AHT20 temperature and humidity sensor chip. Resistors R17 and R18 are pull-up resistors to ensure the accuracy of IIC communication. Capacitor C12 and resistor R16 are components to ensure power supply stability and prevent interference from the power supply. VCC is the power supply interface, and SDA and SCL are the communication interface.

[0049] like Figure 3 As shown, in the power supply unit circuit of the execution end, the power supply unit converts the input AC power into 5V DC power output to supply other parts.

[0050] The 485 communication unit uses a 485 communication chip to realize data communication between the microcontroller and the temperature controller panel.

[0051] like Figures 4a-4b As shown, the normally open contact HIGH of the fan relay K1 is connected to the fan control terminal, and coil pins 1 and 2 are connected to the collector O1 terminal of transistor Q1 and the 5V power supply, respectively. A diode D4 is connected in parallel with the coil to protect the entire system from reverse current. The base of transistor Q1 is connected to the IO terminal of the microcontroller through resistor R12, and the emitter is grounded.

[0052] like Figures 5a-5c As shown, the normally open contact 1 of the valve relay is connected to the valve control terminal, and the common terminal is connected to the live wire L; the coil pin 4 is connected to the 5V power supply, and the pin 3 is connected to the collector O4 terminal of the transistor Q4. It is also connected to the 5V power supply through diode D7, which provides reverse current protection for the entire system; the base of the transistor Q4 is connected to the I / O terminal of the microcontroller through resistor R15, and the emitter is grounded.

[0053] The fan and valve are controlled by two different relays to blow air and spray water onto the test surface, ensuring no condensation occurs. Relays K1 and K4 control the switches, with relays K1 and K4 controlling output at their respective interfaces by opening and closing. A microcontroller controls the conduction of transistors Q1 and Q4 to control the relay's opening and closing. The relay array unit only needs to interpret the control signal from the microcontroller. The fan relay is an electromagnetic relay, model GK3FF; the valve relay is an electromagnetic relay, model GK23F.

[0054] like Figure 6 As shown, the microcontroller circuit is the core of the entire execution end. It receives external information through various interfaces, processes and analyzes the information, and performs a series of actions such as transmission and control based on the analysis results.

Claims

1. A split-type dew point detection system, characterized in that, Including the actuator and dew point detection sensor; The execution end includes: A microcontroller is connected to a dew point detection sensor. The relay array unit is connected to the microcontroller and the actuator; Communication unit; connects to the microcontroller and the external temperature controller panel; The dew point detection sensor is a temperature and humidity sensor.

2. The split-type dew point detection system according to claim 1, characterized in that, The dew point detection sensor includes a temperature and humidity sensor chip, a resistor, and a capacitor; The power supply terminal of the temperature and humidity sensor chip is connected to the power supply through resistor R16. The power supply is connected to the first sensor data terminal SCL through resistor R17 and to the second sensor data terminal SDA through resistor R18. It is also connected to the ground terminal of the temperature and humidity sensor chip through capacitor C12. The first sensor data terminal SCL and the second sensor data terminal SDA are connected to the microcontroller.

3. The split-type dew point detection system according to claim 1, characterized in that, The relay array unit includes a fan control circuit; The fan control circuit includes a fan relay and a transistor Q1 connected thereto; The normally open contact of the fan relay is connected to the fan control terminal, one end of the coil is connected to the power supply, and the other end is connected to the collector of transistor Q1; a first diode is connected in parallel with the coil. The base of transistor Q1 is connected to the first I / O port of the microcontroller through resistor R12, and the emitter is grounded. It is also connected to the first I / O port of the microcontroller through resistor R13.

4. The split-type dew point detection system according to claim 1, characterized in that, The relay array unit includes a valve control circuit: The valve control circuit includes a valve relay and a transistor Q1 connected thereto; The normally open contact of the valve relay is connected to the valve control terminal, one end of the coil is connected to the power supply, the other end is connected to the collector of transistor Q4, and it is also connected to the power supply through a second diode. The base of transistor Q4 is connected to the second I / O port of the microcontroller through resistor R15, and the emitter is grounded and also connected to the second I / O port of the microcontroller through resistor R19.

5. A split-type dew point detection system according to claim 1, characterized in that, The power supply unit includes: The first input terminal L of the power supply unit is connected to the first input terminal of the rectifier bridge BD1 in sequence through resistors FR1 and RV1, and the node between resistors FR1 and RV1 is connected to the second input terminal of the rectifier bridge. The second input terminal N of the power supply unit is connected to the first input terminal of the rectifier bridge, the second output terminal of the rectifier bridge is connected to the A terminal of the first primary coil of the transformer, and the first output terminal of the rectifier bridge is connected to the A terminal of the first primary coil through capacitor C1. The current detection pin CS of the isolated primary-side feedback chip U1 is grounded through resistor R1. The intelligent power pin SW of U1 is connected to the A terminal of the first primary coil of the transformer through diodes D2 and D1, and is directly connected to the B terminal of the first primary coil of the transformer. The feedback pin FB of U1 is connected to the two ends of the second primary coil of the transformer through resistors R3 and R4. The B terminal of the second primary coil is connected to the voltage input pin VDD of U1 through capacitor C2. The A terminal of the second primary coil is connected to the voltage input pin VDD of U1 through resistor R2 and diode D3. A capacitor C3 is connected between the feedback pin FB of U1 and the B terminal of the second primary coil. The A terminal of the transformer secondary coil outputs a 5V voltage through diode D9, which serves as the power supply voltage; the B terminal of the transformer secondary coil is grounded, and the output terminal of diode D9 is grounded through capacitor C4 and resistor R5 respectively.

6. The split-type dew point detection system according to claim 1, characterized in that, The distance between the dew point detection sensor and the surface to be measured is at least 10 cm.

7. A split-type dew point detection system according to claim 1, characterized in that, The actuator and the dew point detection sensor are each equipped with a housing.

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