CN219063693U - Energy-saving control system of terminal air conditioner - Google Patents

Abstract

The utility model discloses an energy-saving control system of a terminal air conditioner, which comprises an MCU (micro control unit), a 485 communication unit, a Pyxos FT communication unit, two paths of digital quantity output units, two paths of analog quantity input units and two paths of digital quantity input units, wherein the 485 communication unit is used for receiving 485 signals and is connected with the MCU, the Pyxos FT communication unit is used for receiving field bus signals and is connected with the MCU, and the two paths of digital quantity input units are connected with the MCU. The utility model can realize the simultaneous transmission of the power supply signal and the communication signal through the field bus, simplifies the difficulty of field installation and wiring, improves the installation efficiency, reduces the construction cost and greatly reduces the difficulty of field debugging.

Description

Energy-saving control system of terminal air conditioner

Technical Field

The utility model relates to the technical field of intelligent home, in particular to an energy-saving control system of a terminal air conditioner.

Background

An air conditioner is an appliance that maintains indoor air comfort using a refrigeration cycle so as to be suitable for human activities. The air conditioner cools the indoor space by: the warm air is sucked into the indoor space, heat-exchanged with the low-temperature refrigerant, and then the heat-exchanged air is discharged to the indoor space. In addition, the air conditioner may heat the indoor space through the reverse operation. With the popularization of intelligent technology, intelligent air conditioners are indispensable devices in home life.

At present, a communication bus and a power-on bus of the intelligent air conditioner are generally separated, and wiring cost is high. And most intelligence is controlled according to a fixed method and cannot be reasonably modified according to the requirements of users. For this reason, it is necessary to develop a control system in which a module can control the air conditioner fan water valve according to the user's needs and in which wiring costs can be saved, so that the user can get better experience.

Disclosure of Invention

In order to solve the problems, the utility model provides the terminal air conditioner energy-saving control system which can reduce wiring cost and provide better experience for users.

In order to achieve the above purpose, the present utility model is realized by the following technical scheme:

the utility model relates to an energy-saving control system of a terminal air conditioner, which comprises a power management unit, an MCU microcontroller and a communication unit connected with the MCU microcontroller, wherein the communication unit comprises a 485 communication unit which receives 485 signals and is connected with the MCU microcontroller unit, and a Pyxos FT communication unit which receives communication signals isolated by a coupling isolation unit in a field bus and is connected with the MCU microcontroller unit, and the MCU microcontroller unit is provided with two paths of analog quantity input units which collect the ambient temperature, two paths of digital quantity output units which control the water valve of an air conditioner fan, and two paths of digital quantity input units which monitor the on-off state of the water valve of the air conditioner fan in real time.

The utility model further improves that: the power management unit comprises a rectifier bridge for rectifying a current bridge pile on a field bus link into direct current, a step-down DC chip for step-down the rectified direct current, and a voltage-stabilizing DC chip for converting the step-down current into a set voltage and providing the set voltage to the MCU.

The utility model further improves that: the Pyxos FT communication unit comprises a Pyxos FT chip embedded with a Pyxos FT protocol, and the Pyxos FT chip performs interactive transmission with the MCU through an SPI bus.

The utility model further improves that: the coupling isolation unit comprises a common-mode inductor, and the Pyxos FT chip is connected with the common-mode inductor through a field bus.

The utility model further improves that: the 485 communication unit is a 485 communication chip AZRS485.

The utility model further improves that: the two-path digital quantity input unit comprises a diode and a resistor capacitor.

The beneficial effects of the utility model are as follows: the tail end air conditioner energy-saving control system has a field communication bus interface, and the communication bus link has a power supply function, so that the real-time performance of the control system is greatly improved while the wiring cost is saved.

On the other hand, through 485 communication unit, can set up the operation mode of fan water valve when reaching appointed temperature, also can set up and use the resistance type temperature sensor of different grade type to can real-time supervision fan and the running state of water valve.

Drawings

FIG. 1 is a schematic diagram of a frame structure of the present utility model;

FIG. 2 is a schematic diagram of a frame structure according to an embodiment of the present utility model;

FIG. 3 is a circuit diagram of an MCU microcontroller according to the present utility model;

FIG. 4 is a circuit diagram of a power management unit according to the present utility model;

FIG. 5 is a circuit diagram of a Pyxos FT communication unit of the present utility model;

FIG. 6 is a circuit diagram of a 485 communication unit of the utility model;

FIG. 7 is a circuit diagram of a two-way digital quantity output unit according to the present utility model;

FIG. 8 is a circuit diagram of a two-way analog input unit according to the present utility model;

FIG. 9 is a circuit diagram of a two-way analog input unit according to the present utility model;

wherein: 1. an MCU microcontroller; 2. 485 communication unit; 3. two paths of digital quantity output units; 4. two paths of digital quantity input units; 5. two paths of analog quantity input units; 6. a Pyxos FT communication unit; 7. a coupling isolation unit; 8. a power management unit; 61. a rectifier bridge; 62. a step-down DC chip; 63. and a voltage stabilizing DC chip.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1-3, the utility model is an energy-saving control system of a terminal air conditioner, comprising an MCU microcontroller 1, a 485 communication unit 2 which receives 485 signals and is connected with the MCU microcontroller 1 unit, two paths of analog quantity input units 3 which collect ambient temperature, two paths of digital quantity input units 4 which monitor the air conditioner fan water valve in real time, two paths of digital quantity output units 5 which control the air conditioner fan water valve, and a Pyxos FT communication unit 6 which receives communication signals of a field bus and is connected with the MCU microcontroller unit 1; the Pyxos FT communication unit 6, the MCU microcontrollers 1 and 485 communication unit 2, the power management unit 8, the two-way analog quantity input unit 5, the two-way digital quantity input unit 4 and the two-way digital quantity output unit 3 are welded on the same circuit board, and the circuit board is fixed in the shell of the air conditioner controller through 4 screws.

As shown in fig. 3, the MCU microcontroller 1 adopts an STM32G070CBT6 chip, the STM32G070CBT6 is a 32-bit low-power-consumption microcontroller, and the air conditioner fan water valve is controlled in the module to realize signal acquisition on each bus, process setting information input by key signals, and return corresponding information.

The 485 communication unit 2 comprises a 485 communication chip and is used for processing 485 interface signals and performing bidirectional interaction of functional parameters with the MCU microcontroller 1.

The Pyxos FT communication unit 3 comprises a Pyxos FT chip embedded with a Pyxos FT protocol, the Pyxos FT chip performs interactive transmission with the MCU microcontroller 1 through an SPI bus, the Pyxos FT chip is connected with a common mode inductor through a field bus, processes field communication bus signals and performs bidirectional interaction of functional parameters with the MCU microcontroller 1.

As shown in fig. 7, the two-path digital quantity output unit 3 comprises a relay HF32FA012-ZS1, and the MCU microcontroller 1 outputs high and low level control triode conduction through an I/O port, so as to control the relay HF32FA012-ZS1 coil to be on or off, realize switching of on and off states, and control a fan and a water valve of an air conditioner.

As shown in fig. 8, the two-path analog input unit 4 includes a diode and a resistor and a capacitor, and the real-time monitoring of the air conditioner fan water valve is realized by collecting the feedback signal of the air conditioner fan water valve.

As shown in fig. 9, the two paths of analog input units 5 include an analog switch RT9701, after the MCU microcontroller 1 collects the adc circuit, the switching of the internal resistance is realized by controlling the switch of the RT9701, and the collection of the temperature of the current environment is realized by collecting the voltage divided by the thermistor, so that the accuracy of the collection of the external temperature can be improved.

The coupling isolation unit 7 comprises two 680uH common mode inductances; the field bus is a 2-core field twisted pair bus, and the field bus is used for transmitting communication signals and 24VAC/DC power signals, so that the communication signals and the power signals are required to be separated, and the field bus is isolated through 680uH common mode inductance because the field bus communication signals are high-frequency carrier signals; the two 680uH common mode inductors are arranged at the inlet of a power supply, and the power supply of the whole system takes power from the rear stage of the inductors.

As shown in fig. 4, the power management unit 8 is configured to convert a power signal isolated from the fieldbus, and output a power source used by the system control circuit, and includes a rectifier bridge 61 configured to rectify a current bridge stack on the fieldbus link into a direct current, a step-down DC chip 62 configured to step down the rectified direct current, and a voltage-stabilizing DC chip 63 configured to convert the step-down current into a set voltage and provide the set voltage to the MCU microcontroller 1, where the voltage-stabilizing DC chip 63 has a model AMS1117, and the step-down DC chip 62 has a model AX3007.

Working principle: the terminal air conditioner energy-saving control system supports the transmission of 24VAC/DC power supply on a pair of 2-core field twisted pair buses through taking a Pyxos FT communication chip as a field bus communication interface link of the terminal air conditioner energy-saving control system, and the transmission rate reaches 312.5Kbps due to the fact that a communication protocol processor and a field bus network transceiver are embedded in the Pyxos FT chip,

the power supply of the tail end air conditioner energy-saving control system is obtained by coupling, isolating and processing a field bus at a transceiver end of a Pyxos FT chip by a power management circuit, and the MCU microcontroller 1 carries out protocol data interaction with the Pyxos FT chip to transmit a communication data frame of the tail end air conditioner energy-saving control system through a high-speed field bus and also supports the field bus power supply;

the power supply signal in the field bus is 24VAC/DC signal, the 24VDC/AC power supply signal in the field bus is separated through the coupling isolation unit 5, the power supply part adopts MB6S bridge rectifier to convert the 24VDC into direct current 24V, adopts the voltage-reducing DC chip 62 with the model number of AX3007 to convert the 24VDC into 5VDC, and further adopts the voltage-stabilizing DC chip 63 with the model number of AMS1117 to convert the 5VDC into 3.3VDC, and the voltage-stabilizing DC chip is used as the circuit power supply of the MCU microcontroller 1, the Pyxos FT chip and the 485 communication chip of the tail-end air conditioner energy-saving control system.

The 485 communication unit 4 uses a 485 communication chip AZRS485, the receiving and transmitting pins of the 485 communication chip are controlled by the MCU microcontroller 1 to realize switching of signal receiving and transmitting, when the MCU microcontroller 1 needs to transmit data, the 485 communication chip is switched to a transmitting mode, the data is transmitted through TXD, when the MCU microcontroller 1 needs to receive the data, the 485 communication chip is switched to a receiving mode, and the data is received back through RXD.

According to the utility model, the external real-time temperature is acquired through the two paths of analog quantity input units 5, the MCU microcontroller 1 compares the external real-time temperature with the current set temperature, and the MCU microcontroller 1 controls the two paths of digital quantity output units according to the internal logic, so that the intelligent control of the terminal air conditioner is realized, and the effects of energy conservation and emission reduction are achieved. The internal logic is specifically as follows: (1) When the fan is started, and the water valve is controlled according to the mode and the temperature difference; when the fan is shut down, the water valve is closed firstly, and then the fan is closed;

(2) When cooling, the water valve is opened at room temperature (set temperature +0.2 ℃); the water valve is closed when the room temperature is < (the set temperature is minus 0.2 ℃);

(3) When heating, the water valve is opened at room temperature < (set temperature-0.2 ℃), and the water valve is closed at room temperature > (set temperature +0.2 ℃);

(4) When ventilation is performed, only the fan is started, and the water valve is not opened;

(5) When the fan stops, the valve must be closed;

(6) If the "wind-off" mode is configured, the fan is stopped after the valve is closed.

According to the utility model, the terminal air conditioner is remotely controlled by using the Pyxos FT communication unit or the 485 communication unit, and when the Pyxos FT communication unit is used, the power supply signal and the communication signal can be transmitted on a field bus link, so that the difficulty of field installation wiring is simplified, the installation efficiency is improved, the construction cost is reduced, and the difficulty of field debugging is greatly reduced.

Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present utility model, and although the present utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present utility model.

Claims (7)

1. The utility model provides an end air conditioner energy-saving control system, includes power management unit, MCU microcontroller and with MCU microcontroller connects's communication unit, its characterized in that: the communication unit comprises a 485 communication unit which receives 485 signals and is connected with the MCU micro-controller unit, and a Pyxos FT communication unit which receives communication signals isolated by the coupling isolation unit in the field bus and is connected with the MCU micro-controller unit, wherein the MCU micro-controller unit is provided with two paths of analog quantity input units which collect ambient temperature, two paths of digital quantity output units which control the water valve of the air conditioner fan, and two paths of digital quantity input units which monitor the on-off state of the water valve of the air conditioner fan in real time.

2. The energy-saving control system for a terminal air conditioner according to claim 1, wherein: the power management unit comprises a rectifier bridge for rectifying a current bridge pile on a field bus link into direct current, a step-down DC chip for step-down the rectified direct current, and a voltage-stabilizing DC chip for converting the step-down current into a set voltage and providing the set voltage to the MCU.

3. The energy-saving control system for a terminal air conditioner according to claim 1, wherein: the Pyxos FT communication unit comprises a Pyxos FT chip embedded with a Pyxos FT protocol, and the Pyxos FT chip performs interactive transmission with the MCU through an SPI bus.

4. A terminal air conditioner energy saving control system according to claim 3, wherein: the coupling isolation unit comprises 680uH common mode inductance, and the Pyxos FT chip is connected with the common mode inductance through a field bus.

5. A terminal air conditioner energy saving control system according to claim 3, wherein: the 485 communication unit is a 485 communication chip AZRS485.

6. The energy-saving control system for a terminal air conditioner according to claim 1, wherein: the two-path digital quantity input unit comprises a diode and a resistor capacitor.

7. The energy-saving control system for a terminal air conditioner according to claim 1, wherein: the two paths of digital quantity output units comprise relays, and the MCU microcontroller controls the relays through driving the three-stage tube.

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