CN112460748B

CN112460748B - Communication device and method for internal and external machines and direct-current power supply variable frequency air conditioner

Info

Publication number: CN112460748B
Application number: CN202011320996.6A
Authority: CN
Inventors: 张嘉鑫; 李明; 张高廷; 徐娟; 毛龙
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-12-07
Anticipated expiration: 2040-11-23
Also published as: CN112460748A

Abstract

The invention discloses an internal and external machine communication device, a method and a direct current supply variable frequency air conditioner, wherein the device comprises: a first communication unit and a second communication unit; one communication unit is used as an internal unit communication unit, and the other communication unit is used as an external unit communication unit; the first communication unit and the second communication unit are provided with optical coupling modules; the first communication unit is connected with the second communication unit through a power line and a communication line; a negative line in the power line and the communication line form a communication loop of the first communication unit and the second communication unit; the first communication unit and the second communication unit realize half-duplex communication between the first communication unit and the second communication unit through the communication loop. According to the scheme, the communication between the internal machine and the external machine of the direct-current power supply variable-frequency air conditioner can be realized, and the hardware cost is not required to be additionally increased.

Description

Communication device and method for internal and external machines and direct-current power supply variable frequency air conditioner

Technical Field

The invention belongs to the technical field of air conditioners, and particularly relates to an internal and external machine communication device of a direct-current power supply variable-frequency air conditioner, the direct-current power supply variable-frequency air conditioner and an internal and external machine communication method of the direct-current power supply variable-frequency air conditioner, in particular to an internal and external machine communication circuit and method of a direct-current power supply variable-frequency split type air conditioner and the air conditioner.

Background

With the high development of science and technology, the direct current power supply and utilization technology has an important role today in more and more obvious resource waste and stricter environmental protection requirements. The direct current power supply technology can effectively prevent electric energy waste, improve the use efficiency of the electric energy and meet the requirement of sustainable development. In recent years, our country follows the international trend, strengthens the research strength on the direct current power supply and utilization technology, combines the direct current power supply and utilization technology with household appliances, and performs related trial in a plurality of trial areas.

Under the background, research and development of household direct current appliances are becoming a trend. In the related scheme, the technology of the household variable frequency air conditioner is mature, current loop communication based on a zero line is usually adopted for communication between an inner machine and an outer machine, the cost is low, and the reliability is high. In order to improve the communication reliability, the dc supply variable frequency air conditioner mostly adopts 485 communication, but the hardware cost of the part is additionally increased.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention aims to provide an inside and outside machine communication device of a direct-current power supply variable frequency air conditioner, the direct-current power supply variable frequency air conditioner and an inside and outside machine communication method of the direct-current power supply variable frequency air conditioner, so that the problem that the direct-current power supply variable frequency air conditioner adopts 485 communication and hardware cost is additionally increased is solved, and the effects that the inside and outside machine communication of the direct-current power supply variable frequency air conditioner can be realized and the hardware cost is not additionally increased are achieved.

The invention provides an inside and outside machine communication device of a DC power supply variable frequency air conditioner, comprising: a first communication unit and a second communication unit; one communication unit is used as an internal unit communication unit, and the other communication unit is used as an external unit communication unit; the first communication unit and the second communication unit are provided with optical coupling modules; the first communication unit is connected with the second communication unit through a power line and a communication line; a negative line in the power line and the communication line form a communication loop of the first communication unit and the second communication unit; the first communication unit and the second communication unit realize half-duplex communication between the first communication unit and the second communication unit through the communication loop.

In some embodiments, the first communication unit and the second communication unit, implementing half-duplex communication between the first communication unit and the second communication unit via the communication loop, includes: one communication unit is used as a master and the other communication unit is used as a slave in the first communication unit and the second communication unit; under the condition that the air conditioner is powered on, the host computer sends handshake data; after the host sends the handshake data, if the host receives a handshake success message fed back by the slave after receiving the handshake data, communication connection is established between the host and the slave, and half-duplex communication between the host and the slave is realized; after the host sends the handshake data, if the host does not receive a handshake success message fed back by the slave based on the handshake data, the host continues to send the handshake data after delaying a set time length.

In some embodiments, the optocoupler module includes: the circuit comprises a first optical coupler and a first resistor, and a second optical coupler and a second resistor; the first communication unit further includes: the device comprises a first sending module, a first receiving module, a stabilized voltage supply and a first reverse connection prevention module; the first transmitting module is connected to the side of a diode in the first optical coupler; the crystal light side in the first optical coupler is connected with the first resistor in parallel; a collector electrode on the transistor side in the first optical coupler is connected to the regulated power supply; the stabilized voltage power supply is connected to a wiring terminal of a power line of the first communication unit; the first receiving module is connected to the transistor side in the second optical coupler; the diode side in the second optical coupler is connected with the second resistor in parallel; an anode on the diode side in the second optocoupler connected to an emitter on the transistor side in the first optocoupler; and a cathode at the side of a diode in the second optical coupler is connected to a wiring terminal of a communication line of the first communication unit after passing through the first reverse connection prevention module.

In some embodiments, the first reverse-connection prevention module comprises: a third resistor and a first diode; and the cathode of the diode side in the second optocoupler is connected to the anode of the first diode after passing through the third resistor, and the cathode of the first diode is connected to a wiring terminal of the communication line of the first communication unit.

In some embodiments, the optocoupler module further comprises: a third optocoupler and a fifth resistor, and a fourth optocoupler and a sixth resistor; the second communication unit further includes: the second sending module, the second receiving module and the second reverse-connection preventing module; the second transmitting module is connected to the diode side in the third optical coupler; a crystal light side in the third optical coupler is connected with the fifth resistor in parallel; a collector electrode on the transistor side in the third optical coupler is connected to a wiring terminal of a communication line of the second communication unit after passing through the second reverse connection prevention module; the second receiving module is connected to the transistor side in the fourth optical coupler; the diode side in the fourth optocoupler is connected with the sixth resistor in parallel; an anode on the diode side in the fourth optocoupler connected to an emitter on the transistor side in the third optocoupler; and a cathode at the diode side in the fourth optocoupler is connected to a wiring terminal of a power line of the second communication unit.

In some embodiments, the second reverse-connection prevention module comprises: a fourth resistor and a second diode; and a collector electrode at the transistor side in the third optocoupler is connected to a cathode of the second diode after passing through the fourth resistor, and an anode of the second diode is connected to a wiring terminal of a communication line of the second communication unit.

In some embodiments, the connection terminal of the power line of the first communication unit includes: a first positive terminal and a first negative terminal; the binding post of the power cord of second communication unit includes: a second positive terminal and a second negative terminal; the first negative connecting terminal can be connected with the second negative connecting terminal, and the communication line connecting terminal of the first communication unit can be connected with the communication line connecting terminal of the second communication unit to form the communication loop; if the voltages of the first positive connecting terminal and the second positive connecting terminal are consistent, the first positive connecting terminal and the second positive connecting terminal can be directly connected; if the voltage of the first negative electrode wiring terminal is inconsistent with that of the second negative electrode wiring terminal, the first negative electrode wiring terminal can be connected with the power supply of the first communication unit, and the second negative electrode wiring terminal can be connected with the power supply of the second communication unit.

In another aspect, the present invention provides a dc-powered inverter air conditioner, including: the communication device for the internal and external machines of the direct current power supply variable frequency air conditioner is disclosed.

In another aspect, the present invention provides a method for communicating between an internal machine and an external machine of a dc-powered inverter air conditioner, the method comprising: the method comprises the steps that half-duplex communication between a first communication unit and a second communication unit is achieved through a communication loop between the first communication unit and the second communication unit; the first communication unit and the second communication unit are provided with optocoupler modules; the first communication unit is connected with the second communication unit through a power line and a communication line; and the negative line in the power line and the communication line form a communication loop of the first communication unit and the second communication unit.

In some embodiments, implementing half-duplex communication between a first communication unit and a second communication unit over a communication loop between the first communication unit and the second communication unit includes: one communication unit is used as a master and the other communication unit is used as a slave in the first communication unit and the second communication unit; under the condition that the air conditioner is powered on, the host computer sends handshake data; after the host sends the handshake data, if the host receives a handshake success message fed back by the slave after receiving the handshake data, communication connection is established between the host and the slave, and half-duplex communication between the host and the slave is realized; after the host sends the handshake data, if the host does not receive a handshake success message fed back by the slave based on the handshake data, the host continues to send the handshake data after delaying a set time length.

Therefore, according to the scheme of the invention, the optical coupler is used for replacing a 485 communication chip, only one communication line is adopted, so that the cathode of the inner machine and the cathode of the outer machine are used as a part of a communication loop of the inner machine and the outer machine, the cathode line and the communication line form the communication loop, the communication between the inner machine and the outer machine of the direct-current power supply air conditioner is realized, the communication between the inner machine and the outer machine of the direct-current power supply variable frequency air conditioner can be realized, and the hardware cost is not required to be additionally increased.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of an indoor and outdoor unit communication device of a dc power supply variable frequency air conditioner according to the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of a DC-powered variable frequency split air conditioner;

FIG. 3 is a schematic structural diagram of another embodiment of a DC-powered inverter split-type air conditioner;

FIG. 4 is a schematic structural diagram of an embodiment of an indoor and outdoor unit communication circuit of the DC powered variable frequency split air conditioner;

FIG. 5 is a schematic diagram illustrating the communication flow of the indoor unit and the outdoor unit of the DC powered inverter split type air conditioner according to an embodiment of the indoor unit and the outdoor unit communication circuit;

FIG. 6 is a schematic diagram showing waveforms of communications signals between the indoor unit and the outdoor unit of an embodiment of the indoor unit and outdoor unit communication circuit of the DC powered variable frequency split air conditioner;

fig. 7 is a schematic structural diagram of an embodiment of an internal and external machine communication circuit in which an internal and external machine communicates by 485;

fig. 8 is a schematic structural diagram of an embodiment of a communication circuit of the internal and external machines for communicating by using the communication method of the present invention;

fig. 9 is a flowchart illustrating an embodiment of a communication method between an internal machine and an external machine of the dc power inverter air conditioner according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

According to the embodiment of the invention, the communication device of the internal machine and the external machine of the direct-current power supply variable frequency air conditioner is provided. Referring to fig. 1, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The communication device of the internal and external machines of the direct current power supply variable frequency air conditioner can comprise: a first communication unit and a second communication unit. One of the first communication unit and the second communication unit serves as an internal unit communication unit, and the other communication unit serves as an external unit communication unit.

And the first communication unit and the second communication unit are provided with optocoupler modules. The first communication unit and the second communication unit are connected through a power line and a communication line. And the negative line in the power line and the communication line form a communication loop of the first communication unit and the second communication unit.

The first communication unit and the second communication unit realize half-duplex communication between the first communication unit and the second communication unit through the communication loop. And the positive connecting terminal of the first communication unit is connected with the positive connecting terminal of the first communication unit. And the negative connecting terminal of the first communication unit is connected with the negative connecting terminal of the first communication unit. And the communication terminal of the first communication unit is connected with the communication terminal of the first communication unit.

Therefore, the communication device of the internal machine and the external machine, which is formed by the first communication unit and the second communication unit, is used for the communication circuit of the low-cost internal machine and the external machine of the direct-current power supply variable frequency air conditioner, is suitable for the direct-current power supply variable frequency air conditioner of a direct-current power grid, does not need direct current-alternating current-direct current secondary energy conversion, and a PFC (power factor correction) link is omitted by the controller, so that the energy loss of the link is reduced, the whole air conditioner is more energy-saving, and the energy efficiency ratio is high. This inside and outside quick-witted communication device adopts low-cost opto-coupler to replace 485 communication chips, and negative pole line and communication line constitute the communication loop, and wherein the negative pole line is power and communication part multiplex, has reduced communication line quantity, the cost is reduced.

In some embodiments, the first communication unit and the second communication unit, implementing half-duplex communication between the first communication unit and the second communication unit via the communication loop, includes: one of the first communication unit and the second communication unit serves as a master, and the other communication unit serves as a slave.

And under the condition that the air conditioner is powered on, the host sends handshake data. After the host sends the handshake data, if the host receives a handshake success message fed back by the slave after receiving the handshake data, the host establishes communication connection with the slave, and half-duplex communication between the host and the slave is realized. After the host sends the handshake data, if the host does not receive a handshake success message fed back by the slave based on the handshake data, the host continues to send the handshake data after delaying a set time length.

Specifically, a part a of the loop regulated power supply is generally selected as a master, and a part B is selected as a slave. After the power is on, the master machine and the slave machine firstly hold hands to suggest communication, then the indoor machine and the outdoor machine send communication data at fixed time according to a protocol or send the data according to the content of the protocol as required, and only one sending source is ensured to be arranged on the communication loop of the indoor machine and the outdoor machine at the same time.

In some embodiments, the optocoupler module includes: a first optical coupler (such as an optical coupler U1) and a first resistor (such as a resistor R1), and a second optical coupler (such as an optical coupler U2) and a second resistor (such as a resistor R2).

The first communication unit (e.g., part a) further includes: the system comprises a first sending module (such as an A sending circuit), a first receiving module (such as an A receiving circuit), a stabilized voltage power supply (such as an A stabilized voltage power supply) and a first reverse connection prevention module.

The first transmitting module is connected to the diode side in the first optical coupler. And the crystal light side in the first optical coupler is connected with the first resistor in parallel. And the collector electrode on the transistor side in the first optical coupler is connected to the stabilized voltage power supply. The stabilized voltage power supply is connected to a terminal of a power line of the first communication unit.

The first receiving module is connected to the transistor side in the second optical coupler. And the diode side in the second optical coupler is connected with the second resistor in parallel. And the anode on the diode side in the second optical coupler is connected to the emitter on the transistor side in the first optical coupler. And a cathode at the side of a diode in the second optical coupler is connected to a wiring terminal of a communication line of the first communication unit after passing through the first reverse connection prevention module.

Specifically, the a transmission circuit: and the part A chip actively sends a communication control signal. A receiving circuit: and the part A chip passively receives communication control signals. And the optical coupler U1 is used for generating the change of loop current on a loop of the communication between the internal and external units by the control signal sent by the main chip of the part A, and can select controllable elements such as an optical coupler, a photoelectric relay, a photoelectric MOS tube and the like. And the optical coupler U2 is used for converting the change of loop current on a loop for communication between an internal machine and an external machine into a communication control signal which can be received by the main chip of the part A, and can select controllable elements such as an optical coupler, a photoelectric relay, a photoelectric MOS tube and the like. The resistor R1 controls whether two ends of the resistor R1 are short-circuited or not through the optocoupler U1, so that loop current of the communication loop of the internal and external machines is changed. The loop current change of the internal and external machine communication loop of the resistor R2 generates voltage change on the resistor R2, so that the communication optocoupler U2 is switched on or off. And the A voltage-stabilized power supply is used for providing a stable voltage source required by the communication loop of the internal and external machines.

Therefore, by replacing a 485 universal chip with a low-cost optical coupler and a peripheral circuit thereof, only one communication line is needed, the cathode of the internal and external units is used as a part of a communication loop, and the cathode line is used for both power transmission and communication transmission. The communication between the internal machine and the external machine of the direct current power supply air conditioner is realized, and the hardware cost is low.

In some embodiments, the first reverse-connection prevention module comprises: a third resistor (e.g., resistor R3) and a first diode (e.g., diode D1).

And the cathode of the diode side in the second optocoupler is connected to the anode of the first diode after passing through the third resistor, and the cathode of the first diode is connected to a wiring terminal of the communication line of the first communication unit.

Specifically, the resistor R3 is used to limit the maximum loop current of the communication loop of the inner and outer units. Diode D1, the protection of preventing connecing wrong, prevent that the terminal power cord from inserting wrong to damage the internal circuit. The reverse cutoff voltage of the diode D1 should be greater than the anode voltage of a, and the diode turn-on voltage drop should be as small as possible.

Therefore, the input polarity reverse connection prevention protection circuit is added to the internal machine and the external machine of the direct current power supply air conditioner, so that the air conditioner and internal parts cannot be damaged when the positive polarity and the negative polarity are reversely connected, and the reliability and the safety of communication are improved.

In some embodiments, the optocoupler module further comprises: a third optical coupler (such as an optical coupler U3) and a fifth resistor (such as a resistor R5), and a fourth optical coupler (such as an optical coupler U4) and a sixth resistor (such as a resistor R6).

The second communication unit (e.g., part B) further includes: a second sending module (such as a B sending circuit), a second receiving module (such as a B receiving circuit) and a second reverse-connection prevention module.

And the second sending module is connected to the diode side in the third optical coupler. And the crystal light side in the third optical coupler is connected with the fifth resistor in parallel. And a collector electrode on the transistor side in the third optical coupler is connected to a wiring terminal of a communication line of the second communication unit after passing through the second reverse connection prevention module.

And the second receiving module is connected to the transistor side in the fourth optical coupler. And the diode side in the fourth optocoupler is connected with the sixth resistor in parallel. And the anode on the diode side in the fourth optical coupler is connected to the emitter on the transistor side in the third optical coupler. And a cathode at the diode side in the fourth optocoupler is connected to a wiring terminal of a power line of the second communication unit.

Specifically, the B part chip is used for actively sending communication control signals. And the B part chip passively receives the communication control signal. And the optical coupler U3 is used for generating the change of loop current on a loop of the communication between the internal and external units by the control signal sent by the main chip of the part B. And the optical coupler U4 is used for converting the change of loop current on a loop for communication between an internal machine and an external machine into a communication control signal which can be received by the main chip of the part B, and can select controllable elements such as an optical coupler, a photoelectric relay, a photoelectric MOS tube and the like. The resistor R5 controls whether two ends of the resistor R5 are short-circuited or not through the optocoupler U3, so that loop current of an internal and external machine communication loop is changed, and controllable elements such as a photocoupler, a photoelectric relay, a photoelectric MOS tube and the like can be selected. The loop current change of the internal and external machine communication loop of the resistor R6 generates voltage change on the resistor R6, so that the communication optocoupler U4 is switched on or off.

In some embodiments, the second reverse-connection prevention module comprises: a fourth resistor (e.g., resistor R4) and a second diode (e.g., diode D2).

And a collector electrode at the transistor side in the third optocoupler is connected to a cathode of the second diode after passing through the fourth resistor, and an anode of the second diode is connected to a wiring terminal of a communication line of the second communication unit.

Specifically, the resistor R4 is used to limit the maximum loop current of the communication loop of the inner and outer units. Diode D2, the protection of preventing connecing wrong, prevent that the terminal power cord from inserting wrong to damage the internal circuit. The reverse cutoff voltage of D2 should be greater than the B positive voltage and the diode turn-on voltage drop should be as small as possible.

In some embodiments, the connection terminal of the power line of the first communication unit includes: a first positive terminal (e.g., a positive pole) and a first negative terminal (e.g., a negative pole). The binding post of the power cord of second communication unit includes: a second positive terminal (e.g., B positive) and a second negative terminal (e.g., B negative). The A anode, the A cathode and the A communication wiring terminal are used for wiring. And the B anode, the B cathode and a connecting terminal for communication of the B are used for wiring. The negative electrodes of the internal and external machines are equipotential and are connected by a lead.

The first negative terminal can be connected with the second negative terminal, and the communication line terminal of the first communication unit can be connected with the communication line terminal of the second communication unit to form the communication loop. If the voltages of the first positive wiring terminal and the second positive wiring terminal are consistent, the first positive wiring terminal and the second positive wiring terminal can be directly connected. If the voltage of the first negative electrode wiring terminal is inconsistent with that of the second negative electrode wiring terminal, the first negative electrode wiring terminal can be connected with the power supply of the first communication unit, and the second negative electrode wiring terminal can be connected with the power supply of the second communication unit.

Specifically, the negative pole A and the communication A of the part A are directly connected with the negative pole B and the communication B of the part B respectively to form a whole communication loop of the internal and external machines. If the voltage of the anode A is consistent with that of the anode B, the anode A can be directly connected with the anode B; and if the voltages of the anode A and the anode B are not consistent, the anode A and the anode B are respectively connected with the anodes of the respective power supply sources. The indoor unit part and the outdoor unit part share the same current loop, and only the indoor unit or the outdoor unit can send information at the same time, so that the indoor unit and the outdoor unit can work in a half-duplex state.

Through a large number of tests, the technical scheme of the invention is adopted, a 485 communication chip is replaced by the optical coupler, only one communication line is adopted, the cathode of the inner machine and the cathode of the outer machine are used as a part of a communication loop of the inner machine and the outer machine, the cathode line and the communication line form the communication loop, the communication between the inner machine and the outer machine of the direct-current power supply air conditioner is realized, the communication between the inner machine and the outer machine of the direct-current power supply variable frequency air conditioner can be realized, and the hardware cost is not required to be additionally increased.

According to the embodiment of the invention, the direct-current power supply variable frequency air conditioner corresponding to the communication device of the internal machine and the external machine of the direct-current power supply variable frequency air conditioner is also provided. The dc supply inverter air conditioner may include: the communication device for the internal and external machines of the direct current power supply variable frequency air conditioner is disclosed.

Generally, a conventional ac-powered variable frequency air conditioner is also called a dc variable frequency air conditioner in a habitual way, through ac-dc-ac conversion and a dc link in the middle. The direct current power supply air conditioner in the scheme of the invention only has direct current-alternating current conversion, is also a direct current variable frequency air conditioner, is different from the conventional alternating current power supply, and is uniformly called as the direct current power supply variable frequency air conditioner in the specification and the following.

In some embodiments, the invention provides a direct current supply variable frequency air conditioner with reverse connection prevention of input polarity, and an internal and external machine communication circuit and a control method thereof. Compared with an alternating current power supply air conditioner, the scheme of the invention is suitable for the direct current power supply variable frequency air conditioner of the direct current power grid, direct current-alternating current-direct current secondary energy conversion is not needed, a PFC (power factor correction) link is omitted for the controller, the energy loss of the link is reduced, the whole air conditioner is more energy-saving, and the energy efficiency ratio is high.

The scheme of the invention provides an internal and external machine communication circuit and a communication control method for a direct-current power supply variable frequency air conditioner, which meet the requirement of data exchange of an internal machine and an external machine and have stronger reliability. Specifically, the scheme of the invention is used for a low-cost internal and external machine communication circuit of a direct-current power supply variable frequency air conditioner, a 485 communication chip is replaced by a low-cost optocoupler, and a negative wire and a communication wire form a communication loop, wherein the negative wire is used for multiplexing a power and communication part, so that the number of the communication wires is reduced, and the cost is reduced. Meanwhile, the communication control method provided by the scheme of the invention realizes half-duplex communication of the internal and external units and can realize stronger communication reliability.

The following describes an exemplary implementation process of the scheme of the present invention with reference to the examples shown in fig. 2 to 8.

Fig. 2 is a schematic structural diagram of an embodiment of a dc-powered variable frequency split air conditioner. As shown in fig. 2, the dc-powered variable frequency split type air conditioner includes: the system comprises an input reverse connection prevention unit, a filtering unit, a direct current fan unit, a compressor unit, a sensor unit, a display unit, a remote control receiving unit, a communication unit, an electric auxiliary heating unit, an external machine power supply unit, a voltage-stabilizing power supply and a main control unit.

Fig. 3 is a schematic structural diagram of another embodiment of the dc-powered variable frequency split air conditioner. As shown in fig. 3, the dc-powered variable frequency split type air conditioner includes: the device comprises an input reverse connection prevention unit, a filtering unit, a direct current fan unit, a compressor unit, a sensor unit, a boosting unit, an expansion valve unit, a four-way valve unit, a communication unit, a voltage-stabilizing power supply and a main control unit.

In the solution of the present invention, the dc-powered inverter air conditioner is divided into an indoor unit and an outdoor unit, and reference may be made to the examples shown in fig. 2 and 3.

In some embodiments, the indoor unit is comprised of all or a portion of the following:

the input reverse connection prevention unit is used for protecting the input direct-current power supply when the input direct-current power supply is connected reversely, and has the following two realization modes:

in the first implementation mode, normal power supply is ensured when the input direct current power supply is correct in polarity, the power supply cannot be switched on when the input direct current power supply is reversely connected, the air conditioner cannot work, and the air conditioner and parts cannot be damaged.

In the second implementation mode, the input direct current power source is connected correctly or reversely, so that the correct power supply polarity of the rear-stage bus and the normal operation of the air conditioner are ensured, namely the unit has the function of wrong polarity conversion. For example: it can be realized by using a full-bridge rectifying circuit similar to a rectifying bridge.

The invention provides a direct current supply variable frequency air conditioner with an input polarity reverse connection prevention function, which can prevent the air conditioner and internal parts from being damaged when the voltage input polarity is wrong. Specifically, the power supply voltage of the dc power supply air conditioner is unipolar, and if the positive electrode and the negative electrode are connected in reverse, the internal elements of the air conditioner are irreversibly damaged, and the controller is damaged. According to the scheme of the invention, the input polarity reverse connection prevention protection circuit is added to the internal machine and the external machine of the direct current power supply air conditioner, so that the air conditioner and internal parts cannot be damaged when the positive polarity and the negative polarity are reversely connected.

The filtering unit is used for filtering the interference from the power supply and ensuring the normal work of the internal unit of the air conditioner; on the other hand, clutter interference generated when the interior of the air conditioner works is filtered, and normal work of other equipment on the same power supply is guaranteed not to be interfered.

And the voltage-stabilizing power supply unit is used for generating a stable power supply required by the control signal.

And the direct current fan unit drives the fan blades of the indoor unit to generate circulating air quantity required by heat exchange by a direct current motor.

The wind sweeping motor unit drives the air deflector of the indoor unit by the stepping motor to change the air supply direction.

A sensor unit, consisting of a series of sensors, for real-time acquisition of input variables required for control, including but not limited to: temperature sensors, light sensitive sensors, humidity sensors, infrared sensors, etc.

The display unit is used for displaying various control or state information and consists of one or more elements such as a light-emitting diode, an LED display screen, a nixie tube and the like.

And the remote control receiving unit is used for receiving the control information set by the user, receiving and transmitting one or more signals such as infrared, radio frequency or WIFI (wireless fidelity).

The communication unit is used for information transmission between the indoor unit and the outdoor unit, and the communication circuit of the indoor unit and the outdoor unit is adopted.

Electric auxiliary heating unit: the main heating element is composed of metal or composite material, the power on or off is controlled by a controllable switch, and the main heating element can be installed or not according to different models.

The outdoor unit power supply unit is used for controlling a circuit device of an outdoor unit power supply, the indoor unit power supply model comprises the outdoor unit power supply unit, and the outdoor unit power supply or the indoor unit and the outdoor unit power supply do not involve.

The main control unit: and the control center controls each controlled unit of the air conditioner to act according to certain functional logic by receiving user set information and collecting external information.

In some embodiments, the outdoor unit is comprised of all or a portion of:

and the input reverse connection preventing unit is connected with the indoor unit input reverse connection preventing unit. Namely, the input reverse connection prevention unit is used for protecting the input direct current power supply when the input direct current power supply is connected reversely, and the input reverse connection prevention unit has the following two realization modes:

In the second implementation mode, the input direct current power source is connected correctly or reversely, so that the correct power supply polarity of the rear-stage bus and the normal operation of the air conditioner are ensured, namely the unit has the function of wrong polarity conversion.

In the scheme of the invention, the variable frequency air conditioner is in direct current power supply (the power supply voltages of the indoor unit and the outdoor unit can be different), the air conditioner is in a split type (the indoor unit and the outdoor unit are separated), the indoor unit and the outdoor unit have input reverse connection prevention protection, an indoor unit and outdoor unit communication circuit is used for the variable frequency split type air conditioner in direct current (a direct current power supply or a battery) power supply, and the negative electrodes of the indoor unit and the outdoor unit are equipotential and are connected by a lead.

And the filtering unit is the same as the indoor unit filtering unit.

And the voltage-stabilizing power supply unit is the same as the indoor unit voltage-stabilizing power supply unit.

And the direct current fan unit drives the fan blades of the outdoor unit to generate circulating air volume required by heat exchange by a direct current motor.

The compressor unit is driven by the rotation of a motor inside the compressor to compress the refrigerant inside the cylinder to generate pressure and temperature changes, and the rotation speed of the compressor is variably controllable.

A sensor unit, consisting of a series of sensors, for real-time acquisition of input variables required for control, including but not limited to: temperature sensors, pressure sensors, current sensors, voltage sensors, etc.

And the boosting unit is used for boosting the input direct-current power supply voltage to the bus voltage required by the normal work of the compressor, and part of machine types do not relate to the unit according to the difference of the compressor and the input direct-current power supply voltage.

The expansion valve unit is used for adjusting a throttling control device of the refrigerant flowing into the indoor unit, and the flow of the refrigerant can be accurately controlled by adjusting the opening of the valve, so that the effect of improving the energy efficiency is achieved. And a capillary throttling mode is adopted in part of models, and the unit is not involved if the opening degree is fixed and not adjustable.

And the four-way valve unit is used for controlling equipment for controlling the flow direction of the refrigerant and can realize the conversion between indoor side refrigeration and heating. Some models have only a cooling function, and the unit is not involved.

And the communication unit is communicated with the indoor unit.

And the main control unit is the same as the main control unit of the indoor unit.

Fig. 4 is a schematic structural diagram of an embodiment of the communication circuit between the internal and external devices of the dc powered variable frequency split air conditioner. As shown in fig. 4, the present invention provides an internal/external device communication circuit, including: part a and part B. The circuits and terminals of parts a and B are located respectively on the indoor side and the outdoor side, or respectively on the outdoor side and the indoor side (i.e., a is on the indoor side, then B is on the outdoor side, or a is on the outdoor side, then B is on the indoor side).

The key difference between the part a and the part B is that the part a provides a regulated power supply (part a regulated power supply in fig. 4) required by a communication circuit loop, the regulated power supply can be obtained by voltage conversion of input power supplies of the anode and the cathode of the part a, and can also be directly provided by the anode of the part a under the condition that the input voltage of the part a is lower, namely the regulated power supply voltage is less than or equal to the input voltage of the anode of the part a.

In the scheme of the invention, the communication circuit of the part A at least comprises the following parts:

a transmission circuit: and the part A chip actively sends a communication control signal.

A receiving circuit: and the part A chip passively receives communication control signals.

And the optical coupler U1 is used for generating the change of loop current on a loop of the communication between the internal and external units by the control signal sent by the main chip of the part A, and can select controllable elements such as an optical coupler, a photoelectric relay, a photoelectric MOS tube and the like.

For example: the photoelectric relay and the photoelectric MOS tube are similar to an optical coupler in form, the primary side of the photoelectric relay and the photoelectric MOS tube is a light emitting diode, the secondary side of the optical coupler is a light receiving triode, the secondary side of the photoelectric relay is a light receiving controllable contact, and the secondary side of the photoelectric MOS tube is a light receiving controllable MOS tube.

And the optical coupler U2 is used for converting the change of loop current on a loop for communication between an internal machine and an external machine into a communication control signal which can be received by the main chip of the part A, and can select controllable elements such as an optical coupler, a photoelectric relay, a photoelectric MOS tube and the like.

The resistor R1 controls whether two ends of the resistor R1 are short-circuited or not through the optocoupler U1, so that loop current of the communication loop of the internal and external machines is changed.

The loop current change of the internal and external machine communication loop of the resistor R2 generates voltage change on the resistor R2, so that the communication optocoupler U2 is switched on or off.

And the resistor R3 is used for limiting the maximum loop current of the communication loop of the inner machine and the outer machine.

Diode D1, the protection of preventing connecing wrong, prevent that the terminal power cord from inserting wrong to damage the internal circuit. The reverse cutoff voltage of the diode D1 should be greater than the anode voltage of a, and the diode turn-on voltage drop should be as small as possible.

The A anode, the A cathode and the A communication wiring terminal are used for wiring.

And the A voltage-stabilized power supply is used for providing a stable voltage source required by the communication loop of the internal and external machines.

The part B communication circuit at least comprises the following parts:

and the part B is a communication control signal actively transmitted by the chip.

And the B part chip passively receives the communication control signal.

And the optical coupler U3 is used for generating the change of loop current on a loop of the communication between the internal and external units by the control signal sent by the main chip of the part B.

And the optical coupler U4 is used for converting the change of loop current on a loop for communication between an internal machine and an external machine into a communication control signal which can be received by the main chip of the part B, and can select controllable elements such as an optical coupler, a photoelectric relay, a photoelectric MOS tube and the like.

The resistor R5 controls whether two ends of the resistor R5 are short-circuited or not through the optocoupler U3, so that loop current of an internal and external machine communication loop is changed, and controllable elements such as a photocoupler, a photoelectric relay, a photoelectric MOS tube and the like can be selected.

The loop current change of the internal and external machine communication loop of the resistor R6 generates voltage change on the resistor R6, so that the communication optocoupler U4 is switched on or off.

And the resistor R4 is used for limiting the maximum loop current of the communication loop of the inner machine and the outer machine.

Diode D2, the protection of preventing connecing wrong, prevent that the terminal power cord from inserting wrong to damage the internal circuit. The reverse cutoff voltage of D2 should be greater than the B positive voltage and the diode turn-on voltage drop should be as small as possible.

And the B anode, the B cathode and a connecting terminal for communication of the B are used for wiring.

The A negative electrode and the A communication of the part A are directly connected with the B negative electrode and the B communication of the part B respectively to form a whole communication loop of the internal and external machines. If the voltage of the anode A is consistent with that of the anode B, the anode A can be directly connected with the anode B; and if the voltages of the anode A and the anode B are not consistent, the anode A and the anode B are respectively connected with the anodes of the respective power supply sources.

In the communication circuit between the indoor unit and the outdoor unit shown in fig. 4, the indoor unit and the outdoor unit share the same current loop, and only the indoor unit or the outdoor unit can transmit information at the same time, so that the communication circuit can operate in a half-duplex state.

The communication circuit of the internal and external machines of the invention can only work in a half-duplex state, and needs to communicate according to an agreed protocol. Fig. 5 is a schematic diagram of the communication flow of the indoor unit and the outdoor unit of the dc powered variable frequency split air conditioner according to an embodiment of the communication circuit. As shown in fig. 5, the communication flow of the indoor and outdoor units of the indoor and outdoor unit communication circuit of the dc supply frequency conversion split type air conditioner includes:

step 1, powering on the air conditioner, starting up, and initializing a program.

And step 2, the host sends handshake data.

And 3, judging whether the slave receives handshake data, if so, sending a handshake success message by the slave, establishing communication between the master and the slave, and executing the step 4. Otherwise, delaying and returning to the step 2, and waiting for the host to send the handshake data.

Step 4, sending by the host and receiving by the slave; the slave machine sends, the master machine receives and the master machine and the slave machine carry out communication.

Fig. 5 shows an inter-machine communication method of an inter-machine communication circuit according to the present invention, in which a portion a providing a loop regulated power supply is generally selected as a master and a portion B is selected as a slave. After the power is on, the master machine and the slave machine firstly hold hands to suggest communication, then the indoor machine and the outdoor machine send communication data at fixed time according to a protocol or send the data according to the content of the protocol as required, and only one sending source is ensured to be arranged on the communication loop of the indoor machine and the outdoor machine at the same time.

In some embodiments, since the communication circuit of the present invention can only operate in the half-duplex state, the communication circuit needs to communicate according to the agreed protocol.

The protocol is a communication rule agreed by both communication parties, such as communication baud rate, communication data packet format, communication packet number, word length, bit definition and the like, and the both communication parties perform encoding and analysis according to the defined rule to complete communication.

Fig. 6 is a schematic diagram of signal waveforms of the communication between the indoor unit and the outdoor unit of the dc powered variable frequency split air conditioner according to an embodiment of the communication circuit between the indoor unit and the outdoor unit of the dc powered variable frequency split air conditioner. Fig. 6 shows the resistance parameter values of the communication circuit of the internal and external machines according to the present invention: r1 ═ R5, R2 ═ R6, R3 ═ R4, and D1 ═ D2, and when the communication method of fig. 5 was used, the voltage waveform measured between the communication-negative electrodes was used.

When the communication loop is idle, the A transmitting circuit and the B transmitting circuit are both high voltage, and the ideal voltage measured between the communication and the negative electrode is V_{Voltage stabilization}/2。

When the A sending circuit starts to send communication data, when the sending level is low, the ideal voltage measured between the communication and the negative pole is 0V (the actual value is slightly larger than 0V under the influence of the diode conduction voltage drop and the loop current, and when the sending level is high, the ideal voltage measured between the communication and the negative pole is V_{Voltage stabilization}2 (actually affected by diode conduction voltage drop and resistance accuracy, actual value and V_{Voltage stabilization}Slightly different/2).

When the B transmitting circuit starts to transmit the communication data, when the transmitting level is low, the ideal voltage measured between the communication-negative electrode is V_{Voltage stabilization}(actually affected by the diode conduction voltage drop and the loop current,the actual value will be slightly lower than V_{Voltage stabilization}(ii) a When the transmission level is high, the ideal voltage measured between the communication-negative electrode at this time is V_{Voltage stabilization}2 (actually affected by diode conduction voltage drop and resistance accuracy, actual value and V_{Voltage stabilization}Slightly different/2).

Fig. 7 is a schematic structural diagram of an embodiment of an internal and external unit communication circuit in which an internal and external unit communicates with each other by 485. As shown in fig. 7, the positive terminal of the indoor unit is connected to the positive terminal of the outdoor unit, the negative terminal of the indoor unit is connected to the negative terminal of the outdoor unit, the a terminal of the indoor unit is connected to the a terminal of the outdoor unit, and the B terminal of the indoor unit is connected to the B terminal of the outdoor unit. In the example shown in fig. 7, two communication lines are required for 485 communication. In fig. 7, A, B indicates 485 communication, and the 485 communication line has two communication lines, i.e., a line a and a line B, which is defined in the specification of 485 communication.

Fig. 8 is a schematic structural diagram of an embodiment of a communication circuit between an internal machine and an external machine for communicating by using the communication method of the present invention. As shown in fig. 8, the positive terminal of the indoor unit is connected to the positive terminal of the outdoor unit, the negative terminal of the indoor unit is connected to the negative terminal of the outdoor unit, and the communication line terminal of the indoor unit is connected to the communication line terminal of the outdoor unit.

According to the scheme of the invention, a 485 universal chip is replaced by a low-cost optical coupler and a peripheral circuit thereof, so that communication between the direct-current power supply air conditioner internal and external units is realized. In the example shown in fig. 8, only one communication line is required, and the negative pole of the inner and outer units is used as a part of the communication loop, so that the negative pole line is used for both power transmission and communication transmission.

Since the processes and functions of the dc-powered inverter air conditioner of this embodiment are basically corresponding to the embodiments, principles and examples of the apparatus shown in fig. 1, the description of this embodiment is not detailed, and reference may be made to the related descriptions in the foregoing embodiments, which are not described herein again.

Through a large number of tests, the technical scheme of the invention replaces 485 communication chips with the optical couplers, only one communication line is adopted, so that the cathode of the inner machine and the cathode of the outer machine are used as a part of a communication loop of the inner machine and the cathode line is used for multiplexing the power and the communication part, the number of the communication lines is reduced, and the cost is reduced.

According to the embodiment of the invention, the invention also provides an internal and external machine communication method of the direct-current power supply variable frequency air conditioner, which corresponds to the direct-current power supply variable frequency air conditioner. The communication method of the internal and external machines of the direct current power supply variable frequency air conditioner can comprise the following steps: the method comprises the steps that half-duplex communication between a first communication unit and a second communication unit is achieved through a communication loop between the first communication unit and the second communication unit; the first communication unit and the second communication unit are provided with optocoupler modules; the first communication unit is connected with the second communication unit through a power line and a communication line; and the negative line in the power line and the communication line form a communication loop of the first communication unit and the second communication unit. The positive connecting terminal of the first communication unit is connected with the positive connecting terminal of the first communication unit; the negative connecting terminal of the first communication unit is connected with the negative connecting terminal of the first communication unit; and the communication terminal of the first communication unit is connected with the communication terminal of the first communication unit.

In some embodiments, a specific process of implementing half-duplex communication between a first communication unit and a second communication unit through a communication loop between the first communication unit and the second communication unit, which may be further described with reference to a flowchart of an embodiment of an inside-outside machine communication method of a dc-powered inverter air conditioner shown in fig. 9, includes: step S110 to step S130.

Step S110, one communication unit is used as a master and the other communication unit is used as a slave in the first communication unit and the second communication unit; and under the condition that the air conditioner is powered on, the host sends handshake data.

Step S120, after the host sends the handshake data, if the host receives a handshake success message fed back after the slave receives the handshake data, the host establishes a communication connection with the slave, so as to implement half-duplex communication between the host and the slave.

Step S130, after the host sends the handshake data, if the host does not receive a handshake success message fed back by the slave based on the handshake data, the host delays for a set duration and then continues to send the handshake data.

Since the processing and functions implemented by the method of this embodiment substantially correspond to the embodiments, principles, and examples of the dc-powered inverter air conditioner, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.

Through a large number of tests, the technical scheme of the embodiment is adopted, a 485 communication chip is replaced by the optical coupler, only one communication line is needed between the indoor unit and the outdoor unit, the indoor unit part and the outdoor unit part share the same current loop, and the cathode of the indoor unit and the cathode of the outdoor unit are used as one part of the communication loop, so that half-duplex communication of the indoor unit and the outdoor unit is realized, and stronger communication reliability can be realized.

In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.

The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An intercom communication device, comprising: a first communication unit and a second communication unit; one communication unit is used as an internal unit communication unit, and the other communication unit is used as an external unit communication unit; wherein the content of the first and second substances,

the first communication unit and the second communication unit are provided with optocoupler modules; the first communication unit is connected with the second communication unit through a power line and a communication line; a negative line in the power line and the communication line form a communication loop of the first communication unit and the second communication unit; the optical coupling module includes: the circuit comprises a first optical coupler and a first resistor, and a second optical coupler and a second resistor; the first communication unit further includes: the device comprises a first sending module, a first receiving module, a stabilized voltage supply and a first reverse connection prevention module; the first transmitting module is connected to the side of a diode in the first optical coupler; the crystal light side in the first optical coupler is connected with the first resistor in parallel; a collector electrode on the transistor side in the first optical coupler is connected to the regulated power supply; the stabilized voltage power supply is connected to a wiring terminal of a power line of the first communication unit; the first receiving module is connected to the transistor side in the second optical coupler; the diode side in the second optical coupler is connected with the second resistor in parallel; an anode on the diode side in the second optocoupler connected to an emitter on the transistor side in the first optocoupler; a cathode at the side of a diode in the second optocoupler is connected to a wiring terminal of a communication line of the first communication unit after passing through the first reverse connection prevention module;

the first communication unit and the second communication unit realize half-duplex communication between the first communication unit and the second communication unit through the communication loop.

2. The intercom communication device according to claim 1, wherein said first communication unit and said second communication unit implement half-duplex communication between said first communication unit and said second communication unit over said communication loop, comprising:

one communication unit is used as a master and the other communication unit is used as a slave in the first communication unit and the second communication unit; under the condition that the air conditioner is powered on, the host computer sends handshake data;

after the host sends the handshake data, if the host receives a handshake success message fed back by the slave after receiving the handshake data, communication connection is established between the host and the slave, and half-duplex communication between the host and the slave is realized;

after the host sends the handshake data, if the host does not receive a handshake success message fed back by the slave based on the handshake data, the host continues to send the handshake data after delaying a set time length.

3. The intercom communication device according to claim 1, characterized in that said first anti-reverse module comprises: a third resistor and a first diode; wherein the content of the first and second substances,

4. The intercom communication device according to claim 1 or 2, characterized in that said optocoupler module further comprises: a third optocoupler and a fifth resistor, and a fourth optocoupler and a sixth resistor;

the second communication unit further includes: the second sending module, the second receiving module and the second reverse-connection preventing module;

wherein the content of the first and second substances,

the second sending module is connected to the side of a diode in the third optocoupler; a crystal light side in the third optical coupler is connected with the fifth resistor in parallel; a collector electrode on the transistor side in the third optical coupler is connected to a wiring terminal of a communication line of the second communication unit after passing through the second reverse connection prevention module;

the second receiving module is connected to the transistor side in the fourth optical coupler; the diode side in the fourth optocoupler is connected with the sixth resistor in parallel; an anode on the diode side in the fourth optocoupler connected to an emitter on the transistor side in the third optocoupler; and a cathode at the diode side in the fourth optocoupler is connected to a wiring terminal of a power line of the second communication unit.

5. The intercom communication device according to claim 4, wherein said second anti-reverse module comprises: a fourth resistor and a second diode; wherein the content of the first and second substances,

6. The intercom communication device as claimed in claim 1 or 2, wherein the connection terminal of the power line of said first communication unit comprises: a first positive terminal and a first negative terminal; the binding post of the power cord of second communication unit includes: a second positive terminal and a second negative terminal; wherein the content of the first and second substances,

the first negative connecting terminal can be connected with the second negative connecting terminal, and the communication line connecting terminal of the first communication unit can be connected with the communication line connecting terminal of the second communication unit to form the communication loop;

if the voltages of the first positive connecting terminal and the second positive connecting terminal are consistent, the first positive connecting terminal and the second positive connecting terminal can be directly connected;

if the voltage of the first negative electrode wiring terminal is inconsistent with that of the second negative electrode wiring terminal, the first negative electrode wiring terminal can be connected with the power supply of the first communication unit, and the second negative electrode wiring terminal can be connected with the power supply of the second communication unit.

7. The utility model provides a DC supply variable frequency air conditioner which characterized in that includes: the communication device between the internal machine and the external machine of the DC power supply frequency conversion air conditioner as claimed in any one of claims 1 to 6.

8. The communication method for the indoor unit and the outdoor unit of the direct current power supply variable frequency air conditioner as claimed in claim 7, comprising the following steps:

the method comprises the steps that half-duplex communication between a first communication unit and a second communication unit is achieved through a communication loop between the first communication unit and the second communication unit; the first communication unit and the second communication unit are provided with optocoupler modules; the first communication unit is connected with the second communication unit through a power line and a communication line; and the negative line in the power line and the communication line form a communication loop of the first communication unit and the second communication unit.

9. The method of claim 8, wherein the half-duplex communication between the first communication unit and the second communication unit is implemented by a communication loop between the first communication unit and the second communication unit, and comprises: