CN108278743B - Communication circuit and communication method of variable frequency air conditioner - Google Patents
Communication circuit and communication method of variable frequency air conditioner Download PDFInfo
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- CN108278743B CN108278743B CN201711390798.5A CN201711390798A CN108278743B CN 108278743 B CN108278743 B CN 108278743B CN 201711390798 A CN201711390798 A CN 201711390798A CN 108278743 B CN108278743 B CN 108278743B
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Abstract
The invention discloses a communication circuit and a communication method of a variable frequency air conditioner, wherein the communication circuit comprises the following components: the system comprises an indoor unit electric control unit, a relay, a live wire and an airborne press driver arranged on a variable frequency compressor of an outdoor unit; the indoor unit electric control unit comprises a first zero-crossing detection circuit and a first control unit which are connected, and the airborne press driver comprises a second zero-crossing detection circuit and a second control unit which are connected; the first control unit is also connected with a second control unit through a relay and a live wire in sequence; the first control unit is used for controlling the on-off of the relay according to a preset on-off period when the first zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire; the second control unit is used for controlling and operating according to the preset on-off period when the second zero-crossing detection circuit detects the alternating current zero crossing point of the live wire, so that information transmission is realized. The invention can realize the information transmission between the indoor unit electric control unit and the airborne press driver on the basis of reducing the cost of communication hardware.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a communication circuit and a communication method of a variable frequency air conditioner.
Background
Along with the improvement of the requirement of people on the comfort level of the air conditioner and the increase of environmental awareness, the variable frequency air conditioner is more and more accepted by people, but the cost of the variable frequency air conditioner is generally higher than that of a fixed frequency air conditioner. The fixed-frequency outdoor unit is not provided with an electric controller, the outdoor compressor and the fan are electrified through an outdoor electrifying relay of an electric control board of the indoor unit, and the specific connection schematic diagram is shown in figure 1. When the indoor machine judges that the press needs to be started, the power-on relay is closed, and the outdoor fan and the press are powered on to operate. The indoor unit and the outdoor unit of the frequency converter are provided with controllers, and the internal and external electric controllers are provided with corresponding communication circuits, so that the message exchange and transmission of the indoor unit and the outdoor unit are realized; the outdoor electronic control controls the operation of the compressor and the fan through various temperature information transmitted indoors and detected outdoor temperature information, and the specific connection schematic diagram is shown in figure 2.
As can be seen from the above description, the communication of the existing frequency conversion scheme requires a special communication module circuit on the indoor and outdoor boards, and the hardware circuit configuration is complex and costly.
Disclosure of Invention
In view of the above, the present invention is directed to a communication circuit and a communication method for an inverter air conditioner, so as to achieve communication between an indoor unit and an outdoor unit of the inverter air conditioner on the basis of reducing communication hardware cost.
Specifically, the invention relates to a communication circuit of a variable frequency air conditioner, comprising: the indoor unit comprises an indoor unit electric control unit, a relay, a live wire and an airborne compressor driver arranged on a variable frequency compressor of the outdoor unit; the indoor unit electric control unit comprises a first zero-crossing detection circuit and a first control unit which are connected, and the airborne press driver comprises a second zero-crossing detection circuit and a second control unit which are connected; the first control unit is also connected with the second control unit through a relay and a live wire in sequence; the first control unit is used for controlling the on-off of the relay according to a preset on-off period when the first zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire; the second control unit is used for controlling and operating according to the preset on-off period when the second zero-crossing detection circuit detects the alternating current zero crossing point of the live wire, so that information transmission is realized.
The invention relates to a communication method of a variable frequency air conditioner, wherein a communication circuit of the variable frequency air conditioner is the communication circuit of the variable frequency air conditioner; the communication method comprises the following steps:
when the first zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire, the first control unit controls the on-off of the relay according to a preset on-off period;
and the second control unit controls to carry out control operation according to the preset on-off period when the second zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire, so as to realize information transmission.
The communication circuit and the communication method of the variable frequency air conditioner do not need to increase extra hardware cost on the basis of the electric control in the fixed frequency machine, the original electric control of the fixed frequency machine can be directly used as the indoor electric control of the variable frequency machine, the online wire does not need to increase a communication wire, and the development and hardware material cost is greatly reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. In the drawings, like reference numerals are used to indicate like elements. The drawings in the following description are directed to some, but not all embodiments of the invention. For a person skilled in the art, other figures can be derived from these figures without inventive effort.
FIG. 1 is a schematic diagram of connection between internal and external electrical devices of a conventional fixed frequency transmitter;
FIG. 2 is a schematic diagram of connection between internal and external electrical appliances of a conventional frequency converter;
fig. 3 is a schematic structural diagram of a communication circuit of an inverter air conditioner according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a communication circuit of another inverter air conditioner according to an embodiment of the present invention;
FIG. 5 is a waveform diagram illustrating the communication content of the communication circuit shown in FIG. 4;
fig. 6 is a flowchart of a communication method of an inverter air conditioner according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present 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. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The communication circuit and system of the inverter air conditioner according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 3, in order to improve the energy efficiency of the air conditioner, the outdoor fixed-frequency compressor is replaced by the inverter compressor on the basis of the existing fixed-frequency compressor, and the compressor controller is integrated on the compressor body; the indoor machine only needs to provide 220V power supply for the compressor, and the compressor driver can control the compressor to operate in a self-adaptive mode according to a certain frequency. In order to solve some situations, the indoor unit needs to give a certain frequency command to the press controller, so that the press can run according to the frequency required by the indoor unit, such as defrosting. Certain information transmission between the indoor unit and the press driver is required. The following explains a specific communication procedure with reference to specific embodiments.
The first embodiment is as follows:
referring to fig. 4, a communication circuit of an inverter air conditioner includes: the indoor unit comprises an indoor unit electric control unit, a relay, a live wire and an airborne compressor driver arranged on a variable frequency compressor of the outdoor unit; the indoor unit electric control unit comprises a first zero-crossing detection circuit and a first control unit which are connected, and the airborne press driver comprises a second zero-crossing detection circuit and a second control unit which are connected; the first control unit is also connected with the second control unit sequentially through the relay and the live wire;
the first control unit is used for controlling the on-off of the relay according to a preset on-off period when the first zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire;
and the second control unit is used for carrying out control operation according to the preset on-off period control when the second zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire, so as to realize information transmission.
In particular operation, the onboard press drive may further comprise: and the voltage reduction circuit is used for reducing the voltage on the live wire and then inputting the voltage to the second control unit.
The airborne press drive may further comprise: and the voltage holding circuit is connected with the second control unit and used for storing electric energy and supplying power to the airborne press driver when the relay is disconnected.
The communication circuit of the variable frequency air conditioner further comprises a relay driving circuit, and the first control unit is connected with the relay through the relay driving circuit.
The period of the alternating current may be 0.02 seconds. The conduction time in the preset on-off period is equal to or more than 3 times of the period of the alternating current.
The functions of each part of the communication circuit of the variable frequency air conditioner are as follows: a first control unit Mcu1 and a second control unit Mcu2 for controlling or detecting output or input signals of the respective modules; the first and second zero-crossing detection circuits are used for detecting the zero-crossing point of the 220V alternating current so as to synchronize the communication time sequence; a relay drive circuit for driving the relay; the relay is used for switching on or off a 220V live wire (L); the voltage holding circuit is used for storing electric energy and supplying power to the airborne press driver circuit when the relay is disconnected; the voltage reduction circuit converts the 220V voltage into a low-voltage input signal which can be detected by Mcu 2; the working process of the communication circuit of the variable frequency air conditioner is briefly described as follows:
indoor side: the relay pull-in time T1; the first control unit MCU1 turns off the relay for a time T2 after detecting the zero-crossing signal, wherein T2 is an integer multiple of the period of 50Hz alternating current; the point in time of the opening of the relay is when a zero crossing is detected. After the MCU1 detects the zero-crossing signal, the effective data bit T3 is sent, wherein T3 is integral multiple of the period of the 50Hz alternating current, and T3 is more than or equal to 3T (T represents the period of the 50Hz alternating current). For example, the pull-in relay T3 time represents data 1, the open relay T2 time represents data 0, and the time points of the pull-in and the open of the relay are pull-in or open when zero-crossing is detected, and the specific waveforms are shown in fig. 5.
The press side: the second control unit MCU2 detects the determination time T2 and T3 according to the zero-crossing signal, and completes decoding verification, thereby implementing information transfer between the internal machine and the onboard press driver.
In the embodiment, the communication between the indoor unit and the onboard press driver is realized by only utilizing the press power-on relay, the internal and external machine on-line live wire (L) and the zero-crossing detection circuit of the original fixed frequency machine without adding an additional hardware circuit. The scheme directly borrows the indoor set electronic control of fixed frequency and need not to increase the indoor and outdoor communication circuit that present converter needs, utilizes the relay of fixed frequency machine and original online can accomplish the communication with airborne compressor driver, need not to change the automatically controlled structure of indoor set, need not to increase indoor and outdoor communication line, can furthest's reduction converter's development cost and hardware material cost.
Example two:
referring to fig. 6, a communication method of an inverter air conditioner is applied to a communication circuit of the inverter air conditioner, and the explanation of the communication circuit is also applicable to the present embodiment; the communication method comprises the following steps:
when the first zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire, the first control unit controls the on-off of the relay according to a preset on-off period;
and the second control unit controls to carry out control operation according to the preset on-off period when the second zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire, so as to realize information transmission.
Specifically, when the first zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire, the step of controlling the on-off of the relay according to a preset on-off period by the first control unit comprises the following steps:
the first control unit controls the relay to be switched off for a first preset time according to a preset on-off period when the first zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire; the first preset time length is a first integral multiple of the period time length of the alternating current;
when the first zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire, the first control unit controls the relay according to a preset on-off periodConduction ofA second preset time length; the sum of the first preset time length and the second preset time length is the preset on-off period, and the second preset time length is the second integral multiple of the period time length of the alternating current.
In the embodiment, under the condition that an additional hardware circuit is not added to the fixed-frequency indoor unit, the communication between the electric control of the indoor unit and a driver of the airborne press is realized by utilizing the electrified relay, the online live wire (L) and the zero-crossing detection circuit of the outdoor unit of the original fixed-frequency indoor unit. The scheme directly borrows the fixed-frequency indoor unit for electric control, does not need to change the structure of an electric control box of the indoor unit and increase indoor and outdoor communication lines, and can reduce the development cost and the hardware material cost of the frequency converter to the maximum extent.
It will be understood by those skilled in the art that all or part of the steps/units/modules for implementing the embodiments may be implemented by hardware associated with program instructions, and the program may be stored in a computer-readable storage medium, and when executed, the program performs the steps corresponding to the units in the embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a frequency conversion air conditioner's communication circuit, includes indoor set electrical unit, relay and live wire, its characterized in that, frequency conversion air conditioner's communication circuit still includes: the machine-mounted press driver is arranged on the variable-frequency compressor of the outdoor unit;
the indoor unit electric control unit comprises a first zero-crossing detection circuit and a first control unit which are connected, and the airborne press driver comprises a second zero-crossing detection circuit and a second control unit which are connected; the first control unit is also connected with the second control unit sequentially through the relay and the live wire;
the first control unit is used for controlling the on-off of the relay according to a preset on-off period when the first zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire;
and the second control unit is used for carrying out control operation according to the preset on-off period control when the second zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire, so as to realize information transmission.
2. The communication circuit of the inverter air conditioner as claimed in claim 1, wherein the airborne press driver further comprises: and the voltage reduction circuit is used for reducing the voltage on the live wire and then inputting the voltage to the second control unit.
3. The communication circuit of the inverter air conditioner according to claim 1 or 2, wherein the airborne press driver further comprises: and the voltage holding circuit is connected with the second control unit and used for storing electric energy and supplying power to the airborne press driver when the relay is disconnected.
4. The communication circuit of the inverter air conditioner as claimed in claim 3, further comprising a relay driving circuit, wherein the first control unit is connected to the relay through the relay driving circuit.
5. The communication circuit of the inverter air conditioner according to claim 4, wherein the period of the alternating current is 0.02 seconds.
6. The communication circuit of the inverter air conditioner according to claim 5, wherein the on-time in the preset on-off period is equal to or greater than 3 times of the period of the alternating current.
7. The communication method of the inverter air conditioner is characterized in that the communication circuit of the inverter air conditioner is the communication circuit of the inverter air conditioner as claimed in any one of claims 1 to 6; the communication method comprises the following steps:
when the first zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire, the first control unit controls the on-off of the relay according to a preset on-off period;
and the second control unit controls to carry out control operation according to the preset on-off period when the second zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire, so as to realize information transmission.
8. The communication method according to claim 7, wherein the step of controlling the on/off of the relay according to a preset on/off period when the first zero-crossing detection circuit detects the zero crossing point of the alternating current in the live wire comprises:
the first control unit controls the relay to be switched off for a first preset time according to a preset on-off period when the first zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire; the first preset time length is a first integral multiple of the period time length of the alternating current;
the first control unit controls the conduction of the relay for a second preset time length according to a preset on-off period when the first zero-crossing detection circuit detects the zero crossing point of the alternating current of the live wire; the sum of the first preset time length and the second preset time length is the preset on-off period, and the second preset time length is the second integral multiple of the period time length of the alternating current.
9. The communication method according to claim 8, wherein the period of the alternating current is 0.02 seconds.
10. The communication method of claim 9, wherein the second integer multiple is equal to or greater than 3 times.
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| CN201711390798.5A CN108278743B (en) | 2017-12-21 | 2017-12-21 | Communication circuit and communication method of variable frequency air conditioner |
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| CN201711390798.5A CN108278743B (en) | 2017-12-21 | 2017-12-21 | Communication circuit and communication method of variable frequency air conditioner |
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| CN108278743A CN108278743A (en) | 2018-07-13 |
| CN108278743B true CN108278743B (en) | 2020-10-09 |
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| CN110762808A (en) * | 2019-10-31 | 2020-02-07 | 广东美的制冷设备有限公司 | Drive control circuit and air conditioner |
| CN115076938B (en) * | 2022-06-23 | 2023-10-27 | 海信（广东）空调有限公司 | Indoor and outdoor unit communication circuit, air conditioner and communication control method of air conditioner |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000205627A (en) * | 1999-01-07 | 2000-07-28 | Matsushita Electric Ind Co Ltd | Waiting operation controller for air conditioner |
| JP2006153346A (en) * | 2004-11-29 | 2006-06-15 | Daikin Ind Ltd | Air conditioner |
| CN101741428A (en) * | 2010-01-12 | 2010-06-16 | 国电龙源电气有限公司 | Electric line carrier communication circuit and modulating and demodulating methods thereof |
| CN202172403U (en) * | 2011-09-08 | 2012-03-21 | 长沙威胜信息技术有限公司 | Low voltage power line carrier communication module |
| CN104425184A (en) * | 2013-08-23 | 2015-03-18 | 海尔集团公司 | Control device for switching on and switching off relay and air conditioner |
| KR101587066B1 (en) * | 2010-08-05 | 2016-01-21 | 삼성전자 주식회사 | Air conditioner and communication method thereof |
| CN206073362U (en) * | 2016-07-05 | 2017-04-05 | 广东美的制冷设备有限公司 | A kind of communicator of air conditioner indoor and outdoor machine |
-
2017
- 2017-12-21 CN CN201711390798.5A patent/CN108278743B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000205627A (en) * | 1999-01-07 | 2000-07-28 | Matsushita Electric Ind Co Ltd | Waiting operation controller for air conditioner |
| JP2006153346A (en) * | 2004-11-29 | 2006-06-15 | Daikin Ind Ltd | Air conditioner |
| CN101741428A (en) * | 2010-01-12 | 2010-06-16 | 国电龙源电气有限公司 | Electric line carrier communication circuit and modulating and demodulating methods thereof |
| KR101587066B1 (en) * | 2010-08-05 | 2016-01-21 | 삼성전자 주식회사 | Air conditioner and communication method thereof |
| CN202172403U (en) * | 2011-09-08 | 2012-03-21 | 长沙威胜信息技术有限公司 | Low voltage power line carrier communication module |
| CN104425184A (en) * | 2013-08-23 | 2015-03-18 | 海尔集团公司 | Control device for switching on and switching off relay and air conditioner |
| CN206073362U (en) * | 2016-07-05 | 2017-04-05 | 广东美的制冷设备有限公司 | A kind of communicator of air conditioner indoor and outdoor machine |
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Effective date of registration: 20210108 Address after: 266101 Haier Industrial Park, 1 Haier Road, Shandong, Qingdao Patentee after: QINGDAO HAIER TECHNOLOGY Co.,Ltd. Patentee after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao Patentee before: QINGDAO HAIER TECHNOLOGY Co.,Ltd. |
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Address after: 266101 Haier Road, Laoshan District, Qingdao, Qingdao, Shandong Province, No. 1 Patentee after: Qingdao Haier Technology Co., Ltd. Patentee after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Industrial Park, 1 Haier Road, Shandong, Qingdao Patentee before: Qingdao Haier Technology Co., Ltd. Patentee before: Haier Zhijia Co.,Ltd. |
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