CN110779187B - Signal transmitting device, signal receiving device, communication device and air conditioner - Google Patents
Signal transmitting device, signal receiving device, communication device and air conditioner Download PDFInfo
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- CN110779187B CN110779187B CN201911065195.7A CN201911065195A CN110779187B CN 110779187 B CN110779187 B CN 110779187B CN 201911065195 A CN201911065195 A CN 201911065195A CN 110779187 B CN110779187 B CN 110779187B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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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]
- H04L12/2803—Home automation networks
- H04L12/2807—Exchanging configuration information on appliance services in a home automation network
- H04L12/2814—Exchanging control software or macros for controlling appliance services in a home automation network
Abstract
The invention provides a signal sending device, a signal receiving device, a communication device and an air conditioner. Wherein, the signal transmission device includes: a modulation circuit configured to replace a high level of a communication signal with a pulse signal of a set frequency to obtain the communication signal after frequency modulation, wherein the set frequency is greater than the frequency of the communication signal; a transmitting circuit connected to the modulating circuit, the transmitting circuit configured to transmit the communication signal after frequency modulation to a signal receiving apparatus. According to the technical scheme, the high-level part of the communication signal to be sent is replaced by the pulse signal with higher frequency, so that the frequency of the high level of the communication signal to be sent is different from that of the low level, the high level and the low level are distinguished through the frequency, the determination of the high level and the low level cannot be influenced even if the transmission line is reversely connected, the non-polarity of communication is realized, and the normal communication is ensured.
Description
Technical Field
The invention relates to the technical field of signal communication, in particular to a signal sending device, a signal receiving device, a communication device and an air conditioner.
Background
Most of communication signals adopted in the existing air conditioner are 2-core differential signals, such as RS-485 communication, CAN (Controller Area Network) communication, and the like. The polarity of the interface of the communication chip for 2-core differential signals is specified, as shown in FIG. 1, a wire P and a wire Q are connected between the RS-485 transmitter 102 and the RS-485 receiver 104, and the differential signals are usedDifference (V) between line P level and line Q levelP-VQ) To represent 0 (or 1), by the difference (V) between the level of line Q and the level of line PQ-VP) To represent 1 (or 0). However, when communication connection between devices is performed, interfaces led out by each product are different, or a communication line is turned during wiring in engineering, which easily causes reverse connection of signal polarity, as shown in fig. 2, if a line P and a line Q are reversely connected, a signal error occurs, and further a communication chip of the air conditioner has a communication fault.
Aiming at the problem that a communication fault easily occurs to a communication chip of an air conditioner, software is usually used for controlling a relay or a control logic gate to perform non-polarity switching in the related technology, but the communication reaction time needs to be increased when the non-polarity switching is performed through the software, and the hidden danger of the communication fault caused by the mechanical failure of the relay can also exist when the relay is used for performing the non-polarity switching.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, an aspect of the present invention is to provide a signal transmission apparatus.
Another aspect of the present invention is to provide a signal receiving apparatus.
In yet another aspect, a communication device is provided.
Yet another aspect of the present invention is to provide an air conditioner.
In view of the above, according to an aspect of the present invention, there is provided a signal transmission apparatus, including: a modulation circuit configured to replace a high level of the communication signal with a pulse signal of a set frequency to obtain a frequency-modulated communication signal, wherein the set frequency is greater than the frequency of the communication signal; and the transmitting circuit is connected to the modulating circuit and is configured to transmit the communication signal after frequency modulation to the signal receiving device.
The signal transmitting device provided by the invention can be arranged in household appliances, such as air conditioners, cooking utensils and other appliances, and is used for transmitting the communication signal of the household appliances to other appliances communicated with the household appliances, or can be arranged in an indoor unit and an outdoor unit and is used for transmitting the communication signal of one of the indoor unit and the outdoor unit to the other. The signal transmitting device comprises a modulation circuit and a transmitting circuit, wherein the modulation circuit acquires a communication signal to be transmitted and replaces the high level of the communication signal to be transmitted with a pulse signal with a larger frequency, and the frequency of the low level part is kept unchanged. Further, the communication signal after frequency modulation is sent to a signal receiving device through a sending circuit (the device provided with the signal receiving device and the device provided with the signal sending device communicate with each other), so that the signal receiving device demodulates the pulse signal with larger frequency in the communication signal after frequency modulation into high level, and the part with smaller frequency is kept as low level to obtain the communication signal. According to the technical scheme, the high-level part of the communication signal to be sent is replaced by the pulse signal with higher frequency, so that the frequency of the high level of the communication signal to be sent is different from that of the low level, the high level and the low level are distinguished through the frequency, the determination of the high level and the low level cannot be influenced even if the transmission line is reversely connected, the non-polarity of communication is realized, and the normal communication is ensured.
The signal transmission device according to the present invention may further include:
in the above technical solution, the method further comprises: and the pulse generation circuit is connected to the modulation circuit and is configured to generate a pulse signal with a set frequency.
In the technical scheme, the pulse generating circuit is connected to the modulation circuit and is used for generating a pulse signal with a set frequency, the set frequency is greater than the frequency of the communication signal to be sent, and the pulse signal with the set frequency is used for replacing the high level of the communication signal to be sent, so that the frequency of the high level and the frequency of the low level of the communication signal to be sent are different, the high level and the low level are distinguished through the frequencies, and the communication nonpolarity is realized.
In any of the above technical solutions, the method further includes: and the frequency modulation circuit is connected to the pulse generation circuit and is configured to adjust the set frequency.
In the technical scheme, the frequency modulation circuit is used for adjusting a set frequency, and the set frequency is limited to be larger than the frequency of a communication signal to be transmitted, so that the high level and the low level can be distinguished according to the frequency.
In any of the above technical solutions, the method further includes: and the bus is connected between the sending circuit and the signal receiving device and is configured to transmit the communication signals after frequency modulation.
In this solution, the signal transmitter is provided with a bus for connecting the transmitter circuit and the signal receiver, i.e. the transmitter circuit can be connected to at least one signal receiver via the bus, so as to be able to communicate with at least one signal receiver.
In any of the above technical solutions, the method further includes: and the controller is connected with the modulation circuit, and the signal controller is configured to control the modulation circuit according to the control signal.
In the technical scheme, the controller is connected to the modulation circuit and controls the modulation circuit according to the control signal, and the controller can also be connected with the pulse generation circuit and used for controlling the pulse generation circuit. The modulation circuit and the pulse generating circuit are enabled to work normally, so that the non-polar communication between the signal sending device and the signal receiving device is realized.
The controller can be connected with a microprocessor except the signal sending device, the microprocessor can generate a control signal and send the control signal to the controller, and the controller transmits the control signal to the modulation circuit and the pulse generating circuit.
In any of the above technical solutions, the modulation circuit includes a logic device and a switching device, a first input end of the logic device is connected to an input end of the communication signal, a second input end of the logic device is connected to the controller, an output end of the logic device is connected to an input end of the switching device, an output end of the switching device is connected to the transmission circuit, a controlled end of the switching device is connected to the controller, and the switching device is connected in parallel to the pulse generating circuit, wherein the switching device is configured to be opened or closed in response to the control signal, the switching device is opened, an output of the modulation circuit is a sum signal of an output signal of the logic device and a pulse signal of a set frequency, the switching device is closed, and an output of the modulation circuit is an output.
In the technical scheme, the modulation circuit comprises a logic device and a switch device, the logic device and the switch device are controlled by a control signal, so that the high level of a communication signal to be transmitted is replaced by a pulse signal with higher frequency by the modulation circuit, the frequency of the low level is kept unchanged, the high level and the low level are distinguished by the frequency, and the determination of the high level and the low level cannot be influenced even if the transmission line is reversely connected. For example, the logic device is an exclusive-or gate, the switching device is a normally closed switch, if the communication signal time sequence to be transmitted is 0-1-0-1-0-1, when the control signal time sequence is 0-1-0-1-0-1, the output signal time sequence of the logic device is 0-0-0-0, and the switching device time sequence is on-off-on, because the switching device is connected in parallel with the pulse generating circuit, when the switching device is off, the pulse generating circuit is short-circuited, the modulation circuit outputs the output signal of the logic device, and when the switching device is on, the output signal of the modulation circuit is the sum signal of the output signal of the logic device and the pulse signal with the set frequency, the output of the modulation circuit is 0-pulse signal with the set frequency-0-pulse signal with the set frequency The pulse signal with fixed frequency obviously replaces the high level of the communication signal to be transmitted with the pulse signal with the set frequency, and the low level is kept unchanged.
In any of the above technical solutions, the pulse generating circuit is a square wave generator; the frequency modulation circuit is a frequency modulation resistor.
In the technical scheme, the pulse generating circuit is a square wave generator and generates a square wave signal with set frequency for replacing the high level of the communication signal to be sent. The frequency modulation circuit is a frequency modulation resistor, and the purpose of adjusting the set frequency is achieved by adjusting the frequency modulation resistor to different resistance values.
According to another aspect of the present invention, there is provided a signal receiving apparatus including: a receiving circuit configured to receive the frequency modulated communication signal; and the demodulation circuit is connected to the receiving circuit and is configured to demodulate a pulse signal with a set frequency in the communication signal after frequency modulation to a high level so as to obtain the communication signal, wherein the set frequency is greater than the frequency of the communication signal.
The signal receiving device provided by the invention can be arranged in household appliances, such as air conditioners, cooking utensils and other appliances, and is used for receiving communication signals sent by other appliances communicating with the household appliances, and also can be arranged in indoor units and outdoor units and used for receiving communication signals sent by the indoor units or the outdoor units to the outdoor units or the indoor units. The signal receiving device comprises a receiving circuit and a demodulation circuit, the receiving circuit receives the communication signal which is sent by the signal sending device and subjected to frequency modulation, and the equipment provided with the signal receiving device and the equipment provided with the signal sending device are communicated with each other. Further, the demodulation circuit sets a pulse signal of a set frequency in the frequency-modulated communication signal to a high level, while a portion of the frequency smaller than the set frequency is kept unchanged to obtain the communication signal. According to the technical scheme, the high and low levels of the communication signals after frequency modulation are distinguished through the frequency, even if the transmission lines are reversely connected, the determination of the high and low levels of the communication signals cannot be influenced, the non-polarity communication is realized, and the normal communication is ensured.
The signal receiving apparatus according to the present invention may further include:
in the above technical solution, the method further comprises: and the bus is connected between the receiving circuit and the signal transmitting device and is configured to transmit the communication signals after frequency modulation.
In this solution, the signal receiving device is provided with a bus for connecting the receiving circuit and the signal transmitting device, i.e. the receiving circuit can be connected to at least one signal transmitting device via the bus, so as to be able to communicate with at least one signal transmitting device.
In any of the above technical solutions, the demodulation circuit is an envelope detection circuit.
In the technical scheme, the envelope detection circuit is used for connecting peak points of a high-frequency signal with one end of time length, and because the frequency of a pulse signal with set frequency in a communication signal after frequency modulation is greater than the frequency of low level in the communication signal after frequency modulation, the peak points of the pulse signal with set frequency are connected, namely the pulse signal with set frequency is changed into a section of high level, so that an initial communication signal which is expected to be sent by a signal sending device is restored, the problem that the correct communication signal cannot be received due to reverse connection of a transmission line is avoided, and communication nonpolarity is realized.
According to a further aspect of the present invention, a communication device is provided, which includes a signal transmitting device according to any one of the above-mentioned technical solutions, and a signal receiving device according to any one of the above-mentioned technical solutions.
The communication device provided by the invention comprises the signal sending device according to any one of the above technical schemes and the signal receiving device according to any one of the above technical schemes, that is, the communication device integrates the signal sending device and the signal receiving device, and can be an integrated chip. The signal transmitting device communicates with the signal receiving device of other communication device, and the signal receiving device communicates with the signal transmitting device of other communication device. The signal transmitting device acquires a communication signal to be transmitted, replaces the high level of the communication signal to be transmitted with a pulse signal with a higher frequency, keeps the frequency of the low level part unchanged, and further transmits the communication signal after frequency modulation to the signal receiving device of other communication devices. The signal receiving device receives the communication signal after frequency modulation sent by the signal sending device of other communication devices, and demodulates the pulse signal with larger frequency in the communication signal after frequency modulation into high level, and the part with smaller frequency is kept as low level to obtain the communication signal. In the technical scheme of the invention, the signal transmitting device replaces the high-level part of the communication signal to be transmitted with the pulse signal with higher frequency, so that the frequency of the high level of the communication signal to be transmitted is different from the frequency of the low level. The signal receiving device connects peak points of pulse signals with set frequency, namely, the pulse signals with the set frequency are changed into a section of high level, so that high and low levels are distinguished through the frequency, even if transmission lines are reversely connected, the determination of the high and low levels cannot be influenced, the non-polarity of communication is realized, and the normal communication is ensured.
The communication device according to the present invention may further have the following technical features:
in the above technical solution, the method further comprises: and the mode switching circuit is respectively connected with the signal transmitting device and the signal receiving device and is configured to switch and control the signal transmitting device or the signal receiving device to work.
In the technical solution, the mode switching circuit is connected to the signal transmitting device and the signal receiving device, and is configured to control the signal transmitting device or the signal receiving device to operate according to a switching signal of a microprocessor (not disposed in the communication device), that is, to control an operating mode of the communication device, so that the communication device can implement a function of transmitting and receiving a communication nonpolar signal.
In any of the above technical solutions, the method further includes: and the bus port is respectively connected with the signal transmitting device and the signal receiving device, and the signal transmitting device and/or the signal receiving device are/is connected with other communication devices through the bus port.
In this solution, the communication device is provided with a bus port, that is to say the signal sending device can be connected to the signal receiving device of at least one other communication device via a bus, so as to be able to communicate with at least one other communication device. The signal receiving device can be connected to the signal transmitting device of at least one other communication device through the bus, so that the signal receiving device can communicate with the at least one other communication device.
According to another aspect of the present invention, an air conditioner is provided, which includes the communication device according to any one of the above-mentioned technical solutions.
The intelligent device provided by the invention comprises the communication device of any one of the technical schemes, and all beneficial technical effects of the communication device of any one of the technical schemes can be realized.
In the above technical solution, the method further comprises: the communication device is arranged in the indoor unit; the outdoor unit and the communication device are arranged in the outdoor unit.
In the technical scheme, the communication device can be installed in the indoor unit and is used for communicating with the outdoor unit or other equipment, and the communication device can also be installed in the outdoor unit and is used for communicating with the indoor unit or other equipment, so that the polarity of communication is nonpolarity, and communication faults are avoided.
Additional aspects and advantages of the invention 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 invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram illustrating a data transmission forward connection of RS-485 communication in the related art;
FIG. 2 is a schematic diagram showing a data transmission reversal of RS-485 communication in the related art;
fig. 3 shows a schematic block diagram of a signal transmission apparatus of a first embodiment of the present invention;
fig. 4 shows a schematic block diagram of a signal transmission apparatus of a second embodiment of the present invention;
fig. 5 shows a schematic block diagram of a signal transmission apparatus of a third embodiment of the present invention;
fig. 6 shows a schematic block diagram of a signal transmission apparatus of a fourth embodiment of the present invention;
fig. 7 shows a schematic block diagram of a signal transmission apparatus of a fifth embodiment of the present invention;
fig. 8 shows a schematic block diagram of a signal receiving apparatus of a first embodiment of the present invention;
fig. 9 shows a schematic block diagram of a signal receiving apparatus of a second embodiment of the present invention;
fig. 10 shows a schematic block diagram of a communication device according to a first embodiment of the present invention;
fig. 11 shows a schematic block diagram of a communication device according to a second embodiment of the present invention;
fig. 12 is a schematic block diagram showing a communication apparatus according to a third embodiment of the present invention;
fig. 13 is a schematic structural diagram of a communication device according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of a communication device according to another embodiment of the present invention;
fig. 15 is a communication topology diagram of a communication device according to an embodiment of the present invention;
FIG. 16 shows a block diagram of a transceiver chip of one embodiment of the invention;
fig. 17 shows a block diagram of a transceiver chip of one embodiment of the invention.
Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 17 is:
102 RS-485 transmitter, 104 RS-485 receiver, 602 modulation module, 604 clock module, 606 driver module, 702 receive module, 704 envelope detection module, 802 bus, 804 control module, 6022 logic device, 6024 switching device.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
In an embodiment of the first aspect of the present invention, a signal transmitting apparatus is provided, and the signal transmitting apparatus is described in detail by the following embodiments.
First embodiment, fig. 3 shows a schematic block diagram of a signal transmission apparatus 300 according to a first embodiment of the present invention. Wherein, this signal transmission device 300 includes:
a modulation circuit 302, the modulation circuit 302 being configured to replace a high level of the communication signal with a pulse signal of a set frequency to obtain a frequency-modulated communication signal, wherein the set frequency is greater than the frequency of the communication signal;
a transmitting circuit 304, the transmitting circuit 304 being connected to the modulating circuit 302, the transmitting circuit 304 being configured to transmit the frequency modulated communication signal to the signal receiving device.
The signal transmitting device 300 of the present invention may be installed in a home appliance, for example, an air conditioner, a cooking appliance, or the like, for transmitting a communication signal of the home appliance to another device communicating with the home appliance, or may be installed in an indoor unit or an outdoor unit for transmitting a communication signal of one of the indoor unit and the outdoor unit to the other. The signal transmitting device comprises a modulation circuit 302 and a transmitting circuit 304, wherein the modulation circuit 302 acquires a communication signal to be transmitted and replaces the high level of the communication signal to be transmitted with a pulse signal with a larger frequency, and the frequency of the low level part is kept unchanged. Further, the communication signal after frequency modulation is transmitted to a signal receiving apparatus through the transmitting circuit 304 (the device provided with the signal receiving apparatus and the device provided with the signal transmitting apparatus communicate with each other), so that the signal receiving apparatus demodulates the pulse signal with larger frequency in the communication signal after frequency modulation to high level, and the part with smaller frequency is kept to low level to obtain the communication signal. In the embodiment of the invention, the high-level part of the communication signal to be sent is replaced by the pulse signal with higher frequency, so that the frequency of the high level of the communication signal to be sent is different from that of the low level, the high level and the low level are distinguished through the frequency, the determination of the high level and the low level cannot be influenced even if the transmission line is reversely connected, the non-polarity of communication is realized, and the normal communication is ensured.
Second embodiment, fig. 4 is a schematic block diagram of a signal transmission apparatus 300 according to a second embodiment of the present invention. Wherein, this signal transmission device 300 includes:
a modulation circuit 302, the modulation circuit 302 being configured to replace a high level of the communication signal with a pulse signal of a set frequency to obtain a frequency-modulated communication signal, wherein the set frequency is greater than the frequency of the communication signal;
a transmitting circuit 304, the transmitting circuit 304 being connected to the modulating circuit 302, the transmitting circuit 304 being configured to transmit the frequency-modulated communication signal to the signal receiving device;
a pulse generating circuit 306, the pulse generating circuit 306 being connected to the modulating circuit 302, the pulse generating circuit 306 being configured to generate a pulse signal of a set frequency.
In this embodiment, the pulse generating circuit 306 is connected to the modulating circuit 302, and is configured to generate a pulse signal with a set frequency, where the set frequency is greater than the frequency of the communication signal to be sent, and replace the high level of the communication signal to be sent with the pulse signal with the set frequency, so that the frequency of the high level and the frequency of the low level of the communication signal to be sent are different, so as to distinguish the high level from the low level by the frequency, and implement communication non-polarity.
In some embodiments, pulse generating circuit 306 may be a square wave generator that generates a square wave signal of a set frequency for replacing the high level of the pending communication signal. The pulse generating circuit 306 may also be another waveform generator, and then converts another waveform into a square wave by waveform conversion.
Third embodiment, fig. 5 is a schematic block diagram of a signal transmission apparatus 300 according to a third embodiment of the present invention. Wherein, this signal transmission device 300 includes:
a modulation circuit 302, the modulation circuit 302 being configured to replace a high level of the communication signal with a pulse signal of a set frequency to obtain a frequency-modulated communication signal, wherein the set frequency is greater than the frequency of the communication signal;
a transmitting circuit 304, the transmitting circuit 304 being connected to the modulating circuit 302, the transmitting circuit 304 being configured to transmit the frequency-modulated communication signal to the signal receiving device;
a pulse generating circuit 306, the pulse generating circuit 306 being connected to the modulating circuit 302, the pulse generating circuit 306 being configured to generate a pulse signal of a set frequency;
a frequency modulation circuit 308, the frequency modulation circuit 308 connected to the pulse generation circuit 306, the frequency modulation circuit 308 configured to adjust the set frequency.
In this embodiment, the frequency modulation circuit 308 is used to adjust a set frequency that is defined to be greater than the frequency of the communication signal to be transmitted, so that the high and low levels are distinguished by the magnitude of the frequency.
In some embodiments, the frequency tuning circuit 308 is a frequency tuning resistor, and the tuning resistor is adjusted to a different resistance value to adjust the set frequency.
Fourth embodiment, fig. 6 is a schematic block diagram of a signal transmission apparatus 300 according to a fourth embodiment of the present invention. Wherein, this signal transmission device 300 includes:
a modulation circuit 302, the modulation circuit 302 being configured to replace a high level of the communication signal with a pulse signal of a set frequency to obtain a frequency-modulated communication signal, wherein the set frequency is greater than the frequency of the communication signal;
a transmitting circuit 304, the transmitting circuit 304 being connected to the modulating circuit 302, the transmitting circuit 304 being configured to transmit the frequency-modulated communication signal to the signal receiving device;
a pulse generating circuit 306, the pulse generating circuit 306 being connected to the modulating circuit 302, the pulse generating circuit 306 being configured to generate a pulse signal of a set frequency;
a frequency modulation circuit 308, the frequency modulation circuit 308 being connected to the pulse generation circuit 306, the frequency modulation circuit 308 being configured to adjust the set frequency;
and a transmission bus 310, wherein the transmission bus 310 is connected between the transmission circuit 304 and the signal receiving device, and the transmission bus 310 is configured to transmit the communication signal after frequency modulation.
In this embodiment, the signal transmitting device is provided with a transmission bus 310 to connect the transmitting circuit 304 and the signal receiving device, that is, the transmitting circuit 304 can be connected with at least one signal receiving device through the transmission bus 310 to be able to communicate with at least one signal receiving device.
Fifth embodiment, fig. 7 is a schematic block diagram of a signal transmission apparatus 300 according to a fifth embodiment of the present invention. Wherein, this signal transmission device 300 includes:
a modulation circuit 302, the modulation circuit 302 being configured to replace a high level of the communication signal with a pulse signal of a set frequency to obtain a frequency-modulated communication signal, wherein the set frequency is greater than the frequency of the communication signal;
a transmitting circuit 304, the transmitting circuit 304 being connected to the modulating circuit 302, the transmitting circuit 304 being configured to transmit the frequency-modulated communication signal to the signal receiving device;
a pulse generating circuit 306, the pulse generating circuit 306 being connected to the modulating circuit 302, the pulse generating circuit 306 being configured to generate a pulse signal of a set frequency;
a frequency modulation circuit 308, the frequency modulation circuit 308 being connected to the pulse generation circuit 306, the frequency modulation circuit 308 being configured to adjust the set frequency;
a transmission bus 310, the transmission bus 310 being connected between the transmission circuit 304 and the signal receiving device, the transmission bus 310 being configured to transmit the frequency-modulated communication signal;
a controller 312, the controller 312 being connected to the modulation circuit 302, the signal controller 312 being configured to control the modulation circuit 302 according to a control signal;
the modulation circuit 302 includes:
a logic device 3022 and a switch device 3024, a first input terminal of the logic device 3022 is connected to the input terminal of the communication signal, a second input terminal of the logic device 3022 is connected to the controller 312, an output terminal of the logic device 3022 is connected to the input terminal of the switch device 3024, an output terminal of the switch device 3024 is connected to the transmitting circuit 304, a controlled terminal of the switch device 3024 is connected to the controller 312, and the switch device 3024 is connected in parallel with the pulse generating circuit 306, wherein the switch device 3024 is configured to be opened or closed in response to the control signal, the switch device 3024 is opened, the output of the modulation circuit 302 is a sum signal of the output signal of the logic device 3022 and the pulse signal with the set frequency, the switch device 3024 is closed, and the output of the modulation circuit 302 is an output signal of the logic.
In this embodiment, the controller 312 is connected to the modulation circuit 302, and controls the modulation circuit 302 according to the control signal, and the controller 312 may also be connected to the pulse generation circuit 306 for controlling the pulse generation circuit 306. So that the modulation circuit 302 and the pulse generation circuit 306 work normally to realize the non-polar communication between the signal transmitting device and the signal receiving device.
The controller 312 may be connected to a microprocessor other than the signal transmission device, and the microprocessor may generate a control signal and transmit the control signal to the controller 312, and the controller 312 transmits the control signal to the modulation circuit 302 and the pulse generation circuit 306.
In this embodiment, the modulation circuit 302 includes a logic device 3022 and a switch 3024, and the logic device 3022 and the switch 3024 are controlled by the control signal so that the modulation circuit 302 replaces the high level of the communication signal to be transmitted with a pulse signal with a higher frequency, and the frequency of the low level is kept unchanged, so as to realize the high and low levels by frequency discrimination without affecting the determination of the high and low levels even if the transmission line is reversely connected. For example, the logic device 3022 is an exclusive or gate, the switch device 3024 is a normally closed switch, if the timing of the communication signal to be transmitted is 0-1-0-1-0-1, when the timing of the control signal is 0-1-0-1-0-1, the timing of the output signal of the logic device 3022 is 0-0-0-0-0, and the timing of the switch device 3024 is off-on, because the switch device 3024 is connected in parallel with the pulse generating circuit 306, when the switch device 3024 is off, the pulse generating circuit 306 is short-circuited, the output signal of the logic device 3022 is output from the modulation circuit 302, and when the switch device 3024 is on, the output signal of the modulation circuit 302 is the sum signal of the output signal of the logic device 3022 and the pulse signal with the set frequency, the output signal of the modulation circuit 302 is a pulse signal with 0-0-set frequency-0 Rate pulse signal-0-pulse signal of set frequency, obviously, the high level of the communication signal to be transmitted is replaced by the pulse signal of set frequency, and the low level is kept unchanged.
In an embodiment of the second aspect of the present invention, a signal receiving apparatus is provided, and the signal receiving apparatus is described in detail by the following embodiments.
First embodiment, fig. 8 shows a schematic block diagram of a signal receiving apparatus 400 according to a first embodiment of the present invention. The signal receiving apparatus 400 includes:
a receiving circuit 402, the receiving circuit 402 configured to receive the frequency modulated communication signal;
a demodulation circuit 404, the demodulation circuit 404 is connected to the receiving circuit 402, and the demodulation circuit 404 is configured to demodulate a pulse signal with a set frequency in the communication signal after frequency modulation to a high level to obtain the communication signal, wherein the set frequency is greater than the frequency of the communication signal.
The signal receiving device 400 of the present invention can be installed in a household appliance, for example, an air conditioner, a cooking appliance, etc., for receiving a communication signal transmitted from another device communicating with the household appliance, or can be installed in an indoor unit or an outdoor unit for receiving a communication signal transmitted from the indoor unit or the outdoor unit to the outdoor unit or the indoor unit. The signal receiving apparatus includes a receiving circuit 402 and a demodulating circuit 404, the receiving circuit 402 receives the communication signal which is sent by the signal sending apparatus and is subjected to frequency modulation, and the device provided with the signal receiving apparatus communicates with the device provided with the signal sending apparatus. Further, the demodulation circuit 404 sets a pulse signal of a set frequency in the frequency-modulated communication signal to a high level, while a portion of the frequency smaller than the set frequency is kept unchanged, to obtain a communication signal. In the embodiment of the invention, the high and low levels of the communication signals after frequency modulation are distinguished through the frequency, so that the determination of the high and low levels of the communication signals cannot be influenced even if the transmission lines are reversely connected, the non-polarity communication is realized, and the normal communication is ensured.
In some embodiments, the demodulation circuit 404 is an envelope detection circuit, and the envelope detection circuit is configured to connect peak points of a high-frequency signal of a certain duration, and since a frequency of a pulse signal with a set frequency in the frequency-modulated communication signal is greater than a frequency of a low level in the frequency-modulated communication signal, the peak points of the pulse signal with the set frequency are connected, that is, the pulse signal with the set frequency is changed to a high level, so as to restore an initial communication signal that the signal transmitting apparatus wants to transmit, thereby avoiding a problem that the communication signal cannot be received correctly due to reverse connection of a transmission line, and achieving communication nonpolarity.
Second embodiment, fig. 9 shows a schematic block diagram of a signal receiving apparatus 400 according to a second embodiment of the present invention. The signal receiving apparatus 400 includes:
a receiving circuit 402, the receiving circuit 402 configured to receive the frequency modulated communication signal;
a demodulation circuit 404, the demodulation circuit 404 is connected to the receiving circuit 402, and the demodulation circuit 404 is configured to demodulate a pulse signal with a set frequency in the communication signal after frequency modulation to a high level to obtain the communication signal, wherein the set frequency is greater than the frequency of the communication signal;
and a receiving bus 406, wherein the receiving bus 406 is connected between the receiving circuit 402 and the signal transmitting device, and the receiving bus 406 is configured to transmit the communication signal after frequency modulation.
In this embodiment, the signal receiving device is provided with a receiving bus 406 to connect the receiving circuit 402 and the signal transmitting device, that is, the receiving circuit 402 can be connected to at least one signal transmitting device through the receiving bus 406 to be able to communicate with at least one signal transmitting device.
In any of the above embodiments, the demodulation circuit 404 is an envelope detection circuit.
In an embodiment of the third aspect of the present invention, a communication device is provided, which is described in detail by the following embodiments.
First embodiment, fig. 10 shows a schematic block diagram of a communication device 500 according to a first embodiment of the present invention. The communication device 500 includes:
a signal transmitting apparatus 300 according to any of the embodiments described above, and a signal receiving apparatus 400 according to any of the embodiments described above.
The communication device 500 provided by the present invention includes the signal transmitting device 300 according to any of the above embodiments and the signal receiving device 400 according to any of the above embodiments, that is, the communication device integrates the signal transmitting device 300 and the signal receiving device 400, and may be an integrated chip. The signal transmitting device 300 communicates with the signal receiving device 400 of other communication device, and the signal receiving device 400 communicates with the signal transmitting device 300 of other communication device. The signal transmitting device 300 acquires the communication signal to be transmitted, replaces the high level of the communication signal to be transmitted with a pulse signal with a higher frequency, and further transmits the communication signal after frequency modulation to the signal receiving device 400 of another communication device, while the frequency of the low level part remains unchanged. The signal receiving apparatus 400 receives the frequency-modulated communication signal transmitted from the signal transmitting apparatus 300 of the other communication apparatus, and demodulates the pulse signal of the larger frequency in the frequency-modulated communication signal to a high level, and the portion of the smaller frequency is kept at a low level to obtain the communication signal. In the embodiment of the present invention, the signal transmitting apparatus 300 replaces the high level part of the communication signal to be transmitted with the pulse signal with a higher frequency, so that the frequency of the high level of the communication signal to be transmitted is different from the frequency of the low level. The signal receiving apparatus 400 connects peak points of the pulse signal with the set frequency, that is, changes the pulse signal with the set frequency into a section of high level, so as to realize the purpose of distinguishing the high level and the low level by the frequency, and even if the transmission lines are reversely connected, the determination of the high level and the low level is not influenced, thereby realizing the non-polarity of communication and ensuring the normal communication.
Second embodiment, fig. 11 shows a schematic block diagram of a communication device 500 according to a second embodiment of the present invention. The communication device 500 includes:
the signal transmission apparatus 300 according to any of the above embodiments;
the signal receiving apparatus 400 according to any of the above embodiments;
and a mode switching circuit 502 connected to the signal transmitting apparatus 300 and the signal receiving apparatus 400, respectively, wherein the mode switching circuit 502 is configured to switch and control the operation of the signal transmitting apparatus 300 or the signal receiving apparatus 400.
In this embodiment, the mode switching circuit 502 is connected to the signal transmitting device 300 and the signal receiving device 400, and is configured to control the signal transmitting device 300 or the signal receiving device 400 to operate according to a switching signal of a microprocessor (not disposed in the communication device), that is, to control an operating mode of the communication device, so that the communication device can implement a function of transmitting and receiving signals without polarity.
Third embodiment, fig. 12 is a schematic block diagram of a communication device 500 according to a third embodiment of the present invention. The communication device 500 includes:
the signal transmission apparatus 300 according to any of the above embodiments;
the signal receiving apparatus 400 according to any of the above embodiments;
a mode switching circuit 502 connected to the signal transmitting apparatus 300 and the signal receiving apparatus 400, respectively, the mode switching circuit 502 configured to switch the operation of the signal transmitting apparatus 300 or the signal receiving apparatus 400;
the bus port 504 is connected to the signal transmitting device 300 and the signal receiving device 400, respectively, and the signal transmitting device 300 and/or the signal receiving device 400 are connected to other communication devices through the bus port 504.
In this embodiment, the communication device is provided with a bus port 504, that is, the signal sending device 300 can be connected to the signal receiving device 400 of at least one other communication device through a bus so as to be able to communicate with at least one other communication device. The signal receiving apparatus 400 can be connected to the signal transmitting apparatus 300 of at least one other communication apparatus through a bus, thereby enabling communication with the at least one other communication apparatus.
In the fourth embodiment, the differential signal of the communication device is represented by 0 (or 1) by the frequency of the difference between the first transmission line level and the second transmission line level, thereby realizing non-polar communication. As shown in fig. 13 and 14, the communication device includes a transmitter 600 and a receiver 700, the transmitter 600 includes a modulation module 602, a clock module 604 and a driving module 606; the receiver 700 comprises a receiving module 702 and an envelope detection module 704. The communication device may be in the form of a bus, including the bus 802 (as shown in fig. 13), in which case the driving module 606 is a bus-type driving module and the receiving module 702 is a bus-type receiving module, or may not be in the form of a bus (as shown in fig. 14).
As shown in fig. 15, the communication topology of the communication device is that communication data is a square wave with a first frequency, and the communication data is modulated by a modulation module 602, specifically, a low level of the communication data is kept as the first frequency, and a high level of the communication data is replaced by a square wave with a second frequency, where the second frequency is greater than the first frequency, and the second frequency is input to a driving module 606, and the driving module 606 loads the modulated communication data on a bus 802. The receiving module 702 receives the modulated communication data from the bus 802, and restores the modulated communication data through the envelope detecting module 704 to obtain the communication data. The clock module 604 can adjust the pulse frequency of the modulation module 602, i.e., adjust the second frequency. The driver module 606 may be a driver conforming to the RS-485 electrical standard or other drivers, and is primarily responsible for transmitting communication data to the bus 802. For example, the pulse frequency of the modulation module 602 is set to 200kHz, the transmission rate of the communication data is set to 20kHz, and the pulse of 200kHz is used to replace the data of the high level part of the original communication data through the modulation module 602, and the data is sent to the bus 802 through the driving module 606. The receiving module 702 (which may be a receiver conforming to the RS-485 electrical standard) receives the communication data, and detects the modulation pulse of 200kHz as a high level by the envelope detecting module 704, so as to obtain the original communication data.
In some embodiments, the transmitter 600 and the receiver 700 may be combined into a transceiver chip, the structure of which is shown in fig. 16 and 17. The transceiver chip has a data transmitting port D and a data receiving port R, both of which are in data communication with a microprocessor (not shown). The transceiver chip has a bus port A and a bus port B for bus connection. With the mode switch port M, it is possible to select whether the transceiver chip is used as a transmitter or a receiver. The transceiver chip has a frequency setting port F _ SET for setting the modulation frequency of the modulation module 602. When the transmitter is selected to be used, the frequency setting port F _ SET may design a required modulation frequency at a chip external resistor (not shown in the figure), the modulation frequency is sent to the clock module 604 through processing of the control module 804, the clock module 604 generates a pulse signal of the modulation frequency and sends the pulse signal of the modulation frequency to the modulation module 602, the modulation module 602 modulates communication data, and the driving module 606 sends the modulated communication data to the bus 802. When the communication data is selected to be used as a receiver, the receiving module 702 receives the modulated communication data through the bus 802, and the envelope detecting module 704 demodulates the modulated communication data to obtain the original communication data.
If the device is compatible with a 485 chip, 485 data can be directly sent by grounding, and 485 data of inverse logic can be sent in a floating mode.
As shown in fig. 17, the modulation module 602 includes a logic device 6022 and a switch device 6024, and the logic device 6022 and the switch device 6024 are controlled by an external control signal, so that the modulation module 602 replaces a high level of a communication signal to be transmitted with a pulse signal with a higher frequency, and the frequency of a low level is kept unchanged, so as to realize that the high level and the low level are distinguished by the frequency, and even if a situation that the transmission line is reversely connected does not affect the determination of the high level and the low level. For example, the logic device 6022 is an exclusive or gate, the switch device 6024 is a normally closed switch, if the timing of the communication signal to be transmitted is 0-1-0-1-0-1, when the timing of the external control signal is 0-1-0-1-0-1, the timing of the output signal of the logic device 6022 is 0-0-0-0-0-0, and the timing of the switch device 6024 is off-on, since the switch device 6024 is connected in parallel with the clock module 604, when the switch device 6024 is off, the clock module 604 is short-circuited, the modulation module 602 outputs the output signal of the logic device 6022, and when the switch device 6024 is on, the output of the modulation module 602 is the sum signal of the output signal of the logic device 6022 and the pulse signal of the set frequency, so that the output of the modulation module 602 is the sum signal of the pulse signal of 0-0 of the set frequency and the pulse Pulse signal-0-pulse signal of set frequency. For another example, the logic device 6022 is an and gate, the switching device 6024 is a normally open switch, if the timing sequence of the communication signal to be transmitted is 0-1-0-1-0-1, when the timing sequence of the external control signal is 1-0-1-0-1-0, the timing sequence of the output signal of the logic device 6022 is 0-0-0-0, and the timing sequence of the switching device 6024 is off-on-off-on, because the switching device 6024 is connected in parallel with the clock module 604, when the switching device 6024 is off, the clock module 604 is short-circuited, the modulation module 602 outputs the output signal of the logic device 6022, and when the switching device 6024 is on, the output of the modulation module 602 is the sum signal of the output signal of the logic device 6022 and the pulse signal with the set frequency, so that the output of the modulation module 602 is the sum signal of the pulse signal with the set frequency from 0 Pulse signal-0-pulse signal of set frequency. Obviously, the high level of the communication signal to be transmitted is replaced by a pulse signal with a set frequency, and the low level is kept unchanged.
In an embodiment of a fourth aspect of the present invention, an air conditioner is provided, including the communication device according to any of the above embodiments.
The intelligent device provided by the invention comprises the communication device of any one of the embodiments, and all beneficial technical effects of the communication device of any one of the embodiments can be realized.
In the above embodiment, the method further includes: the communication device is arranged in the indoor unit; the outdoor unit and the communication device are arranged in the outdoor unit.
In this embodiment, the indoor unit can be equipped with the communication device for communicating with the outdoor unit or other devices, and the outdoor unit can also be equipped with the communication device for communicating with the indoor unit or other devices, so as to realize polarity-free communication and avoid communication failure.
In the description herein, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly stated or limited otherwise; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. A signal transmission device, comprising:
a modulation circuit configured to replace a high level of a communication signal with a pulse signal of a set frequency, the frequency of a low level portion of the communication signal being maintained constant, to obtain the communication signal after frequency modulation, wherein the set frequency is greater than the frequency of the communication signal;
a transmitting circuit connected to the modulating circuit, the transmitting circuit configured to transmit the communication signal after frequency modulation to a signal receiving apparatus.
2. The signal transmission apparatus according to claim 1, further comprising:
a pulse generation circuit connected to the modulation circuit, the pulse generation circuit configured to generate a pulse signal of the set frequency.
3. The signal transmission apparatus according to claim 2, further comprising:
a frequency modulation circuit connected to the pulse generation circuit, the frequency modulation circuit configured to adjust the set frequency.
4. The signal transmission device according to any one of claims 1 to 3, characterized by further comprising:
a bus connected between the transmitting circuit and the signal receiving device, the bus configured to transmit the communication signal after frequency modulation.
5. The signal transmission apparatus according to claim 2, further comprising:
a controller connected to the modulation circuit, the signal controller configured to control the modulation circuit according to a control signal.
6. The signal transmission apparatus according to claim 5,
the modulation circuit comprises a logic device and a switch device, wherein a first input end of the logic device is connected to an input end of the communication signal, a second input end of the logic device is connected to the controller, an output end of the logic device is connected to an input end of the switch device, an output end of the switch device is connected to the sending circuit, a controlled end of the switch device is connected to the controller, and the switch device is connected with the pulse generation circuit in parallel,
wherein the switching device is configured to open or close in response to the control signal, the switching device is open, the output of the modulation circuit is a summation signal of the output signal of the logic device and the pulse signal of the set frequency, the switching device is closed, and the output of the modulation circuit is the output signal of the logic device.
7. The signal transmission apparatus according to claim 3,
the pulse generating circuit is a square wave generator;
the frequency modulation circuit is a frequency modulation resistor.
8. A signal receiving apparatus, comprising:
a receive circuit configured to receive a frequency modulated communication signal;
a demodulation circuit connected to the receiving circuit, the demodulation circuit being configured to demodulate a pulse signal with a set frequency in the communication signal after frequency modulation to a high level, and a portion smaller than the set frequency in the communication signal remains unchanged to obtain the communication signal, wherein the set frequency is larger than the frequency of the communication signal.
9. The signal receiving apparatus according to claim 8, further comprising:
a bus connected between the receiving circuit and a signal transmitting device, the bus configured to transmit the communication signal after frequency modulation.
10. The signal receiving apparatus according to claim 8 or 9,
the demodulation circuit is an envelope detection circuit.
11. A communication device, comprising:
the signal transmission device according to any one of claims 1 to 7; and
a signal receiving device as claimed in any one of claims 8 to 10.
12. The communication device of claim 11, further comprising:
and the mode switching circuit is respectively connected with the signal transmitting device and the signal receiving device and is configured to switch and control the signal transmitting device or the signal receiving device to work.
13. The communication device according to claim 11 or 12, further comprising:
and the bus port is respectively connected with the signal transmitting device and the signal receiving device, and the signal transmitting device and/or the signal receiving device are/is connected with other communication devices through the bus port.
14. An air conditioner, comprising:
the communication device of any one of claims 11 to 13.
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