CN114938316B - Isolation asynchronous communication circuit and method of household appliance and household appliance - Google Patents
Isolation asynchronous communication circuit and method of household appliance and household appliance Download PDFInfo
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- CN114938316B CN114938316B CN202210556249.5A CN202210556249A CN114938316B CN 114938316 B CN114938316 B CN 114938316B CN 202210556249 A CN202210556249 A CN 202210556249A CN 114938316 B CN114938316 B CN 114938316B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/427—Loop networks with decentralised control
- H04L12/433—Loop networks with decentralised control with asynchronous transmission, e.g. token ring, register insertion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/35—Devices for recording or transmitting machine parameters, e.g. memory chips or radio transmitters for diagnosis
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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Abstract
The application discloses an isolated asynchronous communication circuit and method of household electrical appliance and the household electrical appliance, the household electrical appliance comprises a first control board and a second control board, the isolated asynchronous communication circuit comprises: the first optical coupler module, the second optical coupler module, the first interface, the transistor module and the second interface; when the second control board sends data to the first control board, the first control board outputs high level through a data sending end of the first control board and controls the first optocoupler module to be conducted so as to form a first communication loop between the second control board and the first control board; when the first control board sends data to the second control board, the second control board outputs high level through the data sending end, and the control transistor module is turned on or turned off according to the level of the data sending end of the first control board, so that a second communication loop is formed between the first control board and the second control board. Therefore, the isolation asynchronous communication circuit is simplified, and the use of connecting wires is reduced, so that the cost is reduced.
Description
Technical Field
The present application relates to the field of home appliance control technologies, and in particular, to an isolated asynchronous communication circuit and method for a home appliance, and a home appliance.
Background
In general, an electric control system of a home appliance including a motor includes three electric controllers including a dc motor driving board, a function main control board, and a man-machine interface display board. In the related art, three power lines (L, N, ground lines) and three communication lines (VCC, GND, DATA) are adopted between the functional main control board and the direct current motor driving board to perform isolated asynchronous communication; in some working cases, three power lines (L, N, ground lines) and four communication lines (VCC, GND, TXD, RXD) are needed between the functional main control board and the direct current motor driving board to perform isolated asynchronous communication.
Obviously, the above mode is adopted to realize the isolation asynchronous communication between the functional main control board and the direct current motor driving board, and the used connecting wires are more, so that the communication circuit is more complex, and the cost of the communication circuit is higher.
Disclosure of Invention
The present application aims to solve at least one of the technical problems in the related art to some extent.
Therefore, an object of the present application is to provide an isolated asynchronous communication circuit of a home appliance, so as to simplify the isolated asynchronous communication circuit and reduce the production cost of the isolated asynchronous communication circuit.
A second object of the present application is to provide an isolated asynchronous communication method for a home appliance.
A third object of the present application is to propose a home appliance.
To achieve the above object, an embodiment of a first aspect of the present application provides an isolated asynchronous communication circuit of a home appliance, the home appliance including a first control board and a second control board, the isolated asynchronous communication circuit including:
the first optical coupler module is respectively connected with the data transmitting end of the first control board, the second optical coupler module and the first pin of the first interface, and the second optical coupler module is respectively connected with the data receiving end of the first control board, the first optical coupler module and the second pin of the first interface;
the transistor module is respectively connected with the data transmitting end of the second control board, the data receiving end of the second control board, the first pin of the second interface and the second pin of the second interface, wherein the first pin of the second interface is used for being connected with the first pin of the first interface, and the second pin of the second interface is used for being connected with the second pin of the first interface;
when the second control board sends data to the first control board, the first control board outputs high level through a data sending end of the first control board, and controls the first optocoupler module to be conducted so as to form a first communication loop between the second control board and the first control board;
when the first control board sends data to the second control board, the second control board outputs high level through the data sending end of the second control board, and the transistor module is controlled to be turned on or turned off according to the level of the data sending end of the first control board, so that a second communication loop is formed between the first control board and the second control board.
When the second control board sends data to the first control board, the data sending end of the first control board is controlled to output high level to enable the first optocoupler module to be conducted, the first interface is connected with the second interface through the two connecting wires, and therefore a first communication loop is formed between the second control board and the first control board, and isolated asynchronous communication between the first control board and the second control board can be achieved; when the first control board sends data to the second control board, the sending end of the second control board is controlled to output high level, and the control transistor module is controlled to be turned on or turned off according to the level of the data sending end of the first control board, so that a second communication loop is formed between the first control board and the second control board; therefore, only two connecting wires are needed between the first control board and the second control board to serve as communication wires, and isolation asynchronous communication can be achieved, so that an isolation asynchronous communication circuit is simplified, and production cost is reduced.
To achieve the above object, an embodiment of a second aspect of the present application provides an isolated asynchronous communication method of a home appliance, where the home appliance includes a first control board, a second control board, and an isolated asynchronous communication circuit according to the first aspect, and the method includes:
determining a data transceiver between the first control board and the second control board; when the second control board is a data sender and the first control board is a data receiver, the first control board outputs high level through a data sending end of the first control board and controls the first optocoupler module to be conducted so as to form a first communication loop between the second control board and the first control board; when the first control board is a data sender and the second control board is a data receiver, the second control board outputs high level through the data sender, and controls the transistor module to be turned on or turned off according to the level of the data sender of the first control board, so that a second communication loop is formed between the first control board and the second control board.
According to the isolated asynchronous communication method of the household appliance, when the second control board sends data to the first control board, the data sending end of the first control board is controlled to output high level to enable the first optocoupler module to be conducted, the first interface is connected with the second interface through the two connecting wires, so that a first communication loop is formed between the second control board and the first control board, and isolated asynchronous communication between the first control board and the second control board can be achieved; when the first control board sends data to the second control board, the sending end of the second control board is controlled to output high level, and the control transistor module is controlled to be turned on or turned off according to the level of the data sending end of the first control board, so that a second communication loop is formed between the first control board and the second control board; therefore, only two connecting wires are needed between the first control board and the second control board to serve as communication wires, and isolation asynchronous communication can be achieved, so that an isolation asynchronous communication circuit is simplified, and production cost is reduced.
To achieve the above objective, an embodiment of a third aspect of the present application provides a home appliance, which includes the isolated asynchronous communication circuit described in the embodiment of the first aspect, a first control board, and a second control board, where the first control board and the second control board perform asynchronous communication through the isolated asynchronous communication circuit.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
FIG. 1 is a block diagram of an isolated asynchronous communication circuit of a home device in accordance with an embodiment of the present application;
FIG. 2 is a circuit diagram of an isolated asynchronous communication circuit according to a first embodiment of the present application;
FIG. 3 is a control flow diagram of isolated asynchronous communications according to an embodiment of the present application;
FIG. 4 is a circuit diagram of an isolated asynchronous communication circuit according to a second embodiment of the present application;
FIG. 5 is a circuit diagram of an isolated asynchronous communication circuit according to a third embodiment of the present application;
FIG. 6 is a circuit diagram of an isolated asynchronous communication circuit according to a fourth embodiment of the present application;
FIG. 7 is a circuit diagram of an isolated asynchronous communication circuit according to a fifth embodiment of the present application;
fig. 8 is a flowchart of an isolated asynchronous communication method of a home device according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
The following describes an isolated asynchronous communication circuit, a method and a home appliance of the home appliance according to the embodiments of the present application with reference to the accompanying drawings. Here, the home appliance may be a washing machine.
Fig. 1 is a block diagram of an isolated asynchronous communication circuit of a home device according to an embodiment of the present application.
As shown in fig. 1, the home appliance includes a first control board 110 and a second control board 120, and the isolated asynchronous communication circuit 100 includes: the first optocoupler module 130, the second optocoupler module 140, the first interface 150, the second interface 160, and the transistor module 170.
The first optocoupler module 130 is connected to the data transmitting end TXD of the first control board 110, the second optocoupler module 140, and a first pin of the first interface 150, respectively. The second optocoupler module 140 is connected to the data receiving end RXD of the first control board 110, the first optocoupler module 130, and the second pin of the first interface 150, respectively. The transistor module 170 is connected to the data transmitting terminal TXD of the second control board 120, the data receiving terminal RXD of the second control board 120, the first pin of the second interface 160, and the second pin of the second interface 160, respectively. The first pin of the second interface 160 is used to connect the first pin of the first interface 150, and the second pin of the second interface 160 is used to connect the second pin of the first interface 150.
It should be noted that, the first control board 110 can control on or off of the first optocoupler module 130 and the second optocoupler module 140; the second control board 120 can control the on or off of the transistor module 170. In some embodiments, the first control board 110 and the second control board 120 may be microprocessor MCUs. When the home appliance is a device including a motor, such as a washing machine, the first control board 110 may be a dc motor driving board, and the second control board 120 may be a functional main control board.
In addition, each of the first interface 150 and the second interface 160 includes at least two pins, and the communication connection between the first control board 110 and the second control board 120 is realized by connecting the two pins of the first interface 150 and the second interface 160.
Specifically, when the second control board 120 sends data to the first control board 110, the data sending end TXD of the first control board 110 is controlled to output a high level to turn on the first optocoupler module 130, and the first interface 150 and the second interface 160 are connected by two communication connection lines, so that a first communication loop is formed between the second control board 120 and the first control board 110, and isolated asynchronous communication between the first control board 110 and the second control board 120 can be realized; when the first control board 110 sends data to the second control board 120, the transmitting terminal TXD of the second control board 120 is controlled to output a high level, and the control transistor module 170 is controlled to be turned on or off according to the data transmitting terminal level of the first control board 110, so that a second communication loop is formed between the first control board 110 and the second control board 120. Therefore, only two communication connection lines are needed between the first control board 110 and the second control board 120 to realize isolated asynchronous communication, thereby simplifying the isolated asynchronous communication circuit and reducing the production cost.
In some embodiments, as shown in fig. 2, the first optocoupler module 130 includes a first resistor R1 and a first optocoupler U1. One end of the first resistor R1 is connected to the data transmitting end TXD of the first control board 110. The anode of the photodiode in the first optical coupler U1 is connected with the other end of the first resistor R1, and the cathode of the photodiode in the first optical coupler U1 is connected to the second ground end GND2; the emitter of the phototriode in the first optocoupler U1 is connected with the second optocoupler module 140, and the collector of the phototriode in the first optocoupler U1 is connected to the first pin of the first interface 150 through the second resistor R2.
When the light emitting diode in the first optocoupler U1 is turned on, the phototransistor in the first optocoupler U1 is turned on (i.e., the collector of the phototransistor inputs a high level, the emitter outputs a high level, the collector of the phototransistor inputs a low level, and the emitter outputs a low level). For example, when the data transmitting terminal TXD of the first control board 110 outputs a high level, the photodiode in the first optocoupler U1 is input with a high level, so that the photodiode in the first optocoupler U1 emits light, the phototransistor in the first optocoupler U1 receives light to be turned on, and generates a photocurrent, the magnitude of the photocurrent depends on the magnitude of the voltage input by the collector of the phototransistor, so that the first optocoupler U1 is turned on.
With continued reference to fig. 2, in some embodiments, the second optocoupler module 140 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, and a second optocoupler U2.
One end of the third resistor R3 is connected to the data receiving end RXD of the first control board 110. One end of the fourth resistor R4 is connected to the other end of the third resistor R3 and has a first node, and the other end of the fourth resistor R4 is connected to the second ground GND2. One end of the first capacitor C1 is connected with one end of the third resistor R3, and the other end of the first capacitor C1 is connected with the other end of the fourth resistor R4. The collector of the phototriode in the second optocoupler U2 is connected to a second power supply VCC2, the emitter of the phototriode in the second optocoupler U2 is connected with the first node, the anode of the phototriode in the second optocoupler U2 is connected with the emitter of the phototriode in the first optocoupler U1, and the cathode of the phototriode in the second optocoupler U2 is connected to the second pin of the first interface 150 through a fifth resistor R5. To ensure that the voltage across the photodiode in the second optocoupler U2 is not too high, a current bleed resistor r1 may be connected in parallel across the photodiode, see fig. 2.
With continued reference to fig. 2, in some embodiments, the transistor module 170 includes a sixth resistor R6, a transistor Q1, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a second capacitor C2.
One end of the sixth resistor R6 is connected to the data transmitting end TXD of the second control board 120. The emitter of the transistor Q1 is connected to the other end of the sixth resistor R6. One end of the seventh resistor R7 is connected with the base electrode of the triode Q1; the other end is connected to a first pin of the second interface 160. One end of the eighth resistor R8 is connected to the data receiving end RXD of the second control board 120. One end of the ninth resistor R9 is connected with the other end of the eighth resistor R8 and is provided with a second node; the other end of the ninth resistor R9 is connected to the first ground GND1, and the second node is connected to the collector of the transistor Q1. One end of the second capacitor C2 is connected to one end of the eighth resistor R8, and the other end of the second capacitor C2 is connected to the other end of the ninth resistor R9 and then connected to the second pin of the second interface 160.
In this embodiment, referring to fig. 2, the transistor Q1 is a PNP transistor Q1, and a pull-up resistor r2 is connected between a base and an emitter of the transistor Q1. When the base electrode of the PNP type triode is at a high level, the PNP type triode is in an off state (an off state), and the voltage of the collector electrode end of the PNP type triode is the same as the voltage at the second node; when the base electrode of the PNP type triode is at a low level, the PNP type triode is in a conducting state, and the collector voltage is the same as the emitter voltage.
The following describes the data transmission process of the isolated asynchronous communication circuit through several working states:
operating state 1 (second control board 120 sends data, first control board 110 receives data):
first, the first control board 110 controls the data transmitting terminal TXD to output a high level, so that the first optocoupler U1 is in a conductive state, and the second control board 120 transmits data through the data transmitting terminal TXD.
Referring to fig. 2, when the second control board 120 transmits data 1 (high level) through the data transmitting terminal TXD, the high level reaches the first pin of the second interface 160 through the sixth resistor R6, the transistor Q1, and the seventh resistor R7; the high level is made to reach the first pin of the first interface 150 through a communication line connected between the first pin of the second interface 160 and the first pin of the first interface 150; then the second resistor R2 reaches the collector electrode of the phototriode in the first optocoupler U1, and the emitter electrode of the phototriode in the first optocoupler U1 outputs high level because the first optocoupler U1 is in a conducting state; the high level reaches the first ground GND1 through the photodiode in the second optocoupler U2, the fifth resistor R5, the second pin of the first interface 150, and the second pin of the second interface 160.
Since the photodiode in the second optocoupler U2 inputs a high level, the second optocoupler U2 is turned on, and the collector of the phototransistor Q1 in the second optocoupler U2 inputs a high level through the second power VCC2, the emitter of the phototransistor in the second optocoupler U2 outputs a high level, and the first control board 110 receives the data 1 (high level).
With continued reference to fig. 2, when the second control board 120 transmits data 0 (low level) through the data transmitting terminal TXD, the low level passes through the sixth resistor R6, the triode Q1, the seventh resistor R7, the first pin of the second interface 160, the first pin of the first interface 150, and the second resistor R2 to reach the collector of the phototransistor Q1 in the first optocoupler U1, and since the first optocoupler U1 is in a conductive state, the emitter of the phototransistor Q1 in the first optocoupler U1 outputs a low level; the low level reaches the first ground GND1 through the photodiode in the second optocoupler U2, the fifth resistor R5, the second pin of the first interface 150, and the second pin of the second interface 160.
Since the photodiode in the second optocoupler U2 inputs a low level, the second optocoupler U2 is turned off, and thus the collector of the phototransistor Q1 in the second optocoupler U2 inputs a high level, but the emitter outputs a low level, and the first control board 110 receives data 0 (low level).
Operating state 2 (first control board 110 transmitting data, second control board 120 receiving data):
first, the second control board 120 controls the data transmission terminal TXD to output a high level, and the first control board 110 transmits data through the data transmission terminal TXD.
Referring to fig. 2, when the first control board 110 outputs data 1 (high level) through the data transmission terminal TXD, the first optocoupler U1 is in a conductive state; since the data transmitting end TXD of the second control board 120 outputs a high level, the high level reaches the collector of the phototransistor in the first optocoupler U1 through the sixth resistor R6, the triode Q1, the seventh resistor R7, the first pin of the second interface 160, the first pin of the first interface 150, and the second resistor R2, and since the first optocoupler U1 is in a conductive state, the emitter of the phototransistor in the first optocoupler U1 outputs a high level; the high level reaches the first ground GND1 through the photodiode in the second optocoupler U2, the fifth resistor R5, the second pin of the first interface 150, and the second pin of the second interface 160.
Accordingly, the transistor Q1 is turned on, and the voltage of the collector of the transistor Q1 is equal to the voltage of the emitter, so that the emitter of the transistor Q1 outputs a high level, and the data receiving terminal RXD of the second control board 120 receives the data 1 (high level).
With continued reference to fig. 2, when the first control board 110 outputs data 0 (low level) through the data transmission terminal TXD, the first optocoupler U1 is in an off state; since the data transmitting terminal TXD of the second control board 120 outputs a high level, the high level reaches the collector of the phototransistor Q1 in the first optocoupler U1 through the sixth resistor R6, the triode Q1, the seventh resistor R7, the first pin of the second interface 160, the first pin of the first interface 150, and the second resistor R2, and since the first optocoupler U1 is in an off state, the emitter of the phototransistor in the first optocoupler U1 outputs a low level; the low level reaches the first ground GND1 through the photodiode in the second optocoupler U2, the fifth resistor R5, the second pin of the first interface 150, and the second pin of the second interface 160.
Thereby, the transistor Q1 is turned off, and the voltage of the collector of the transistor Q1 is equal to the voltage at the first ground GND1, so that the emitter of the transistor Q1 outputs a low level, and further, the data receiving terminal RXD of the second control board 120 receives the data 0 (low level).
It should be noted that, in the present embodiment, the voltage from the collector to the base of the triode Q1 in the isolated asynchronous communication circuit needs at least 0.7V, the voltage drop of the output of the first optocoupler U1 is about 0.3V, and the input voltage of the second optocoupler U2 is about 1.2V. The normal working voltage of the isolated asynchronous communication circuit is calculated to be more than 2.2V (namely 0.7V+0.3V+1.2V), and the lowest power supply voltage value used by a microprocessor MCU in the household appliance is 3.3V. The common voltage of the second resistor R2, the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 in the circuit is 1V, so when the isolated asynchronous communication circuit is used in a 3.3V power supply system, the triode Q1, the first optocoupler U1 and the second optocoupler U2 in the circuit can all be in a normal working state to complete the required communication function.
Therefore, the voltage application range of the isolated asynchronous communication circuit 100 of the embodiment of the application can be as wide as 3.3V, and the microprocessor MCU using a 3.3V power supply system can be satisfied, thereby improving the application value thereof.
FIG. 3 is a control flow diagram of isolated asynchronous communication according to an embodiment of the present application. The following describes the data transceiving process of the isolated asynchronous communication, taking the example that the second control board 120 transmits data and the first control board 110 receives data.
As shown in fig. 3, the data transmitting terminal TXD of the second control board 120 starts transmitting data, and at the same time, the first control board 110 controls the data transmitting terminal TXD to output a high level; the data receiving end RXD of the first control board 110 receives a data start bit; the first control board 110 determines whether a data start bit is received, if yes, the data receiving end RXD of the first control board 110 starts to receive data, and if not, the data receiving end RXD of the first control board 110 continues to receive the data start bit; after the data receiving end RXD of the first control board 110 receives data, the first control board 110 detects whether the data receiving end RXD receives a data end bit, if yes, the data transmission is completed, and if not, the first control board 110 controls the data receiving end RXD to continue to receive data.
It should be noted that, in asynchronous communication, the data format includes a start bit, a data bit, a parity bit and an end bit, and by receiving the data start bit, the data receiving end RXD can be prompted that data transmission is about to start; and receiving the data end bit, and prompting the data receiving end RXD to end data transmission. Illustratively, the data start bit is signal 0 (low), taking up one bit; the data bits may be multiple bits; the last bit is the end of data bit, represented by signal 1 (high). When the data receiving end RXD of the first control board 110 receives the signal 0, it represents that a data start bit is received, that is, data transmission starts; when the data receiving terminal RXD of the first control board 110 receives the signal 1, it represents that the data end bit is received, and the data transmission ends.
In the embodiment of the present application, the types and the number of the connection lines used between the first interface 150 and the second interface 160 may be set according to different application scenario requirements.
In some embodiments, the second pins of the first and second interfaces 150 and 160 may be multiplexed with the neutral pin, and the first and second interfaces 150 and 160 may further include a live pin and a ground pin, respectively. Fig. 4 is a circuit diagram of an isolated asynchronous communication circuit according to a second embodiment of the present application. As shown in fig. 4, a communication line is used between a first pin of the first interface 150 and a second pin of the second interface 160, the second pin is a zero line pin, a connection line between two second pins is a multiplexing line of the communication line and a power line, the third pin is a fire wire pin, the fourth pin is a ground wire pin, and the two third pins and the two fourth pins are all connected by using the power line. Thus, communication between the first control board 110 and the second control board 120 can be achieved through one communication line and one zero line.
In some embodiments, the first interface 150 and the second interface 160 may further include a hot pin, a neutral pin, and a ground pin, respectively. Fig. 5 is a circuit diagram of an isolated asynchronous communication circuit according to a third embodiment of the present application. As shown in fig. 5, the first interface 150 and the second interface 160 are connected by using communication lines between the first pins and between the second pins; the third pin, the fourth pin and the fifth pin are respectively a fire wire pin, a zero wire pin and a ground wire pin, and the two corresponding pins are connected by using a power wire.
In some embodiments, the second pins of the first interface 150 and the second interface 160 may be multiplexed with the neutral pin, and may further include a fire wire pin, respectively. Fig. 6 is a circuit diagram of an isolated asynchronous communication circuit according to a fourth embodiment of the present application. As shown in fig. 6, the first pins of the first interface 150 and the second interface 160 are connected by using a communication line, the second pin is a zero line pin, the connection line between the two second pins is a multiplexing line of the communication line and the power line, the third pin is a fire wire pin, and the connection line between the two third pins is a power line.
In some embodiments, the first interface 150 and the second interface 160 may further include a hot pin and a neutral pin, respectively. Fig. 7 is a circuit diagram of an isolated asynchronous communication circuit according to a fifth embodiment of the present application. As shown in fig. 7, the first pins and the second pins of the first interface 150 and the second interface 160 are connected by using communication wires; the third pin and the fourth pin are a live wire pin and a zero wire pin respectively, and the corresponding pins are connected by using a power line.
Therefore, in the isolated asynchronous communication circuit of the embodiment of the application, the data transmission between the first control board 110 and the second control board 120 is realized through the regulation and control of the first optical coupler U1, the second optical coupler U2 and the triode Q1 by the first control board 110 and the second control board 120, and the isolated asynchronous communication circuit is simplified; and, the number of connection lines between the first control board 110 and the second control board 120 can be reduced to three, thereby reducing the use cost of the connection lines. In addition, the voltage application range of the isolated asynchronous communication circuit of the embodiment of the application can be as wide as 3.3V, and the microprocessor MCU using a 3.3V power supply system can be satisfied, so that the isolated asynchronous communication circuit has higher engineering application value.
Based on the isolation asynchronous communication circuit of the household electrical appliance, the application further provides an isolation asynchronous communication method of the household electrical appliance.
Fig. 8 is a flowchart of an isolated asynchronous communication method of a home device according to an embodiment of the present application. As shown in fig. 8, the method includes the steps of:
step S810: a data transceiver between the first control board and the second control board is determined.
Step S820: when the second control board is a data sender and the first control board is a data receiver, the first control board outputs high level through the data sender to control the first optocoupler module to be conducted so as to form a first communication loop between the second control board and the first control board.
Step S830: when the first control board is a data sender and the second control board is a data receiver, the second control board outputs a high level through the data sender, and the control transistor module is turned on or off according to the level of the data sender of the first control board, so that a second communication loop is formed between the first control board and the second control board.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the described modules may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.
It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present application is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are alternative embodiments, and that the acts and modules referred to are not necessarily required for the present application.
In order to achieve the above embodiment, the present application further provides a home appliance, which includes the isolated asynchronous communication circuit, the first control board, and the second control board provided in the above embodiment. The first control board and the second control board are in asynchronous communication through an isolated asynchronous communication circuit.
In addition, it should be noted that other structures and functions of the home appliance according to the embodiments of the present application are known to those skilled in the art, and are not described herein for redundancy reduction.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application is not limited to the specific combinations of the features described above, but also covers other embodiments which may be formed by any combination of the features described above or their equivalents without departing from the spirit of the application. Such as the above-mentioned features and the technical features having similar functions (but not limited to) applied for in the present application are replaced with each other.
Claims (10)
1. An isolated asynchronous communication circuit of a home appliance, wherein the home appliance comprises a first control board and a second control board, the isolated asynchronous communication circuit comprising:
the first optical coupler module is respectively connected with the data transmitting end of the first control board, the second optical coupler module and the first pin of the first interface, and the second optical coupler module is respectively connected with the data receiving end of the first control board, the first optical coupler module and the second pin of the first interface;
the transistor module is respectively connected with the data transmitting end of the second control board, the data receiving end of the second control board, the first pin of the second interface and the second pin of the second interface, wherein the first pin of the second interface is used for being connected with the first pin of the first interface, and the second pin of the second interface is used for being connected with the second pin of the first interface;
when the second control board sends data to the first control board, the first control board outputs high level through a data sending end of the first control board, and controls the first optocoupler module to be conducted so as to form a first communication loop between the second control board and the first control board;
when the first control board sends data to the second control board, the second control board outputs high level through a data sending end of the second control board, and the transistor module is controlled to be turned on or turned off according to the level of the data sending end of the first control board, so that a second communication loop is formed between the first control board and the second control board;
wherein, the first optocoupler module includes: the anode of the photodiode in the first optocoupler is connected with the data transmitting end of the first control board, the cathode of the photodiode in the first optocoupler is connected to the second ground end, and the collector of the phototriode in the first optocoupler is connected to the first pin of the first interface;
the second optocoupler module includes: the collector of the phototriode in the second optocoupler is connected to a second power supply, the emitter of the phototriode in the second optocoupler is connected with the data receiving end of the first control board, the anode of the phototriode in the second optocoupler is connected with the emitter of the phototriode in the first optocoupler, and the cathode of the phototriode in the second optocoupler is connected to the second pin of the first interface.
2. The isolated asynchronous communication circuit of claim 1 wherein the first optocoupler module further comprises:
and one end of the first resistor is connected with the data transmitting end of the first control board, and the other end of the first resistor is connected with the anode of the photodiode in the first optocoupler, wherein the collector of the phototriode in the first optocoupler is connected to the first pin of the first interface through the second resistor.
3. The isolated asynchronous communication circuit of claim 2 wherein the second optocoupler module further comprises:
one end of the third resistor is connected with the data receiving end of the first control board;
one end of the fourth resistor is connected with the other end of the third resistor and is provided with a first node, the other end of the fourth resistor is connected to the second ground, the first node is connected with an emitter of a phototriode in the second optocoupler, and a cathode of the photodiode in the second optocoupler is connected to a second pin of the first interface through a fifth resistor;
and one end of the first capacitor is connected with one end of the third resistor, and the other end of the first capacitor is connected with the other end of the fourth resistor.
4. An isolated asynchronous communication circuit according to any of claims 1-3, wherein the transistor module comprises:
one end of the sixth resistor is connected with the data transmitting end of the second control board;
the emitting electrode of the triode is connected with the other end of the sixth resistor;
one end of the seventh resistor is connected with the base electrode of the triode, and the other end of the seventh resistor is connected to the first pin of the second interface;
one end of the eighth resistor is connected with the data receiving end of the second control board;
a ninth resistor, one end of which is connected with the other end of the eighth resistor and is provided with a second node, the other end of the ninth resistor is connected to the first ground, and the second node is connected with the collector electrode of the triode;
and one end of the second capacitor is connected with one end of the eighth resistor, and the other end of the second capacitor is connected with the other end of the ninth resistor and then connected to a second pin of the second interface.
5. The isolated asynchronous communication circuit of claim 1 wherein the second pins of the first interface and the second interface are multiplexed with a neutral pin and further comprise a hot pin and a ground pin, respectively.
6. The isolated asynchronous communication circuit of claim 1 wherein the first interface and the second interface further comprise a hot pin, a neutral pin, and a ground pin, respectively.
7. The isolated asynchronous communication circuit of claim 1 wherein the second pins of the first interface and the second interface are multiplexed with a neutral pin and further comprise a fire wire pin, respectively.
8. The isolated asynchronous communication circuit of claim 1 wherein the first interface and the second interface further comprise a hot pin and a neutral pin, respectively.
9. An electrical home appliance, comprising:
the isolated asynchronous communication circuit of any of claims 1-8;
the first control board and the second control board are in asynchronous communication through the isolation asynchronous communication circuit.
10. A method of isolated asynchronous communication of a home appliance comprising a first control board, a second control board, and an isolated asynchronous communication circuit according to any of claims 1-8, the method comprising:
determining a data transceiver between the first control board and the second control board;
when the second control board is a data sender and the first control board is a data receiver, the first control board outputs high level through a data sending end of the first control board and controls the first optocoupler module to be conducted so as to form a first communication loop between the second control board and the first control board;
when the first control board is a data sender and the second control board is a data receiver, the second control board outputs high level through the data sender, and controls the transistor module to be turned on or turned off according to the level of the data sender of the first control board, so that a second communication loop is formed between the first control board and the second control board.
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