CN202014233U - Digital signal communication circuit and air conditioner equipped therewith - Google Patents
Digital signal communication circuit and air conditioner equipped therewith Download PDFInfo
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- CN202014233U CN202014233U CN2010206959226U CN201020695922U CN202014233U CN 202014233 U CN202014233 U CN 202014233U CN 2010206959226 U CN2010206959226 U CN 2010206959226U CN 201020695922 U CN201020695922 U CN 201020695922U CN 202014233 U CN202014233 U CN 202014233U
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- digital signal
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Abstract
The utility model discloses a digital signal communication circuit and an air conditioner equipped therewith, comprising an input terminal for receiving a digital signal and an output terminal for outputting the digital signal. A comparator is connected in a digital signal transmission line between the input terminal and the output terminal, the level of the received signal and the reference voltage are compared by the comparator and outputted thereafter. By adding a comparator in the transmission line of digital signal, the anti-interference capability of signal transmission is enhanced, and the reliability of the communication circuit is improved. After applying the digital signal communication circuit in the system circuit design of an air conditioner, fault due to data error in communication process is effectively avoided, accurate transmission of signal is ensured even if the data communication baud rate is increased, thus improving the reliability and stability of operation of the air conditioner.
Description
Technical field
The utility model belongs to the signal transmission technology field, specifically, relates to a kind of air conditioner that is used for the communicating circuit of transmission of digital signals and adopts described digital signal communicating circuit design.
Background technology
Along with the continuous lifting of air-conditioning intelligent product level, the function that air conditioner can be realized is more and more.Increasing of function brings its internal circuit complex system degree constantly to aggravate, and increasing functional module need be carried out data communication with the CPU on the air conditioner mainboard, to finish corresponding separately task.Therefore, guaranteeing the reliable transmission of data-signal between CPU and each functional module, is one of key that is related to the machine system reliability service.
Present air conditioner is when its digital signal communicating circuit of design, the most of employing directly drives (promptly directly driving the functional module that is attached thereto by CPU) or triode drives (digital signal that is about to CPU output improve the load capacity of digital signal by the triode that is attached thereto after, transfer to other functional module again) dual mode.Such as just needing the such digital telecommunication circuit of design between CPU in air conditioner room unit and the display, with the digital data transmission of CPU output to display, driving display shows information such as the operational mode of current air conditioner or temperature.
The communicating circuit that adopts the design of above-mentioned traditional approach can be stablized operate as normal usually when the lower digital signal of Transmission bit rate.If but the baud rate of signal and communication improves, problems such as communication data mistake or communication be bad then might occur, thereby reduce air-conditioning product reliability of operation, even cause air conditioner to break down.
Based on this, how to improve the stability and the reliability of communicating circuit transmission of digital signals, be the subject matter that present electronic product research staff needs to be resolved hurrily.
The utility model content
The utility model occurs the problem of communication data mistake when the higher digital signal of Transmission bit rate easily at existing communicating circuit, provides a kind of new Digital signal and communication circuit, to realize the transmission accurately and reliably of digital signal.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of digital signal communicating circuit comprises input terminal that is used for receiving digital signals and the lead-out terminal that is used to export digital signal; Wherein, be connected with comparator in the digital data transmission circuit between described input terminal and lead-out terminal, digital signal level and the reference voltage that receives compared back output by described comparator.
Further, between the input of described input terminal and comparator, be connected with first triode that drives usefulness; Between the output of described comparator and described lead-out terminal, be connected with second triode that is used for the digital signal level of comparator output is carried out matched transform.
Further again, described first triode is a NPN type triode, and its base stage connects described input terminal, grounded emitter, collector electrode respectively with corresponding connection of in-phase input end of first DC power supply and described comparator, the inverting input of described comparator connects reference voltage; The amplitude of described reference voltage is lower than the amplitude of described first DC power supply.
Further again, described second triode is a NPN type triode, and its base stage connects the output of described comparator, grounded emitter, and collector electrode is connected with described lead-out terminal is corresponding with second DC power supply respectively; The amplitude of described second DC power supply equals the desired level magnitude of digital signal input pin of digital signal receiver module.
Further, the amplitude of described first DC power supply is greater than the amplitude of second DC power supply.
Based on above-mentioned digital signal communicating circuit structure, the utility model provides a kind of air conditioner that adopts described digital signal communicating circuit design again, specifically be connected between the CPU and display of air conditioner, to improve the reliability of digital data transmission between CPU and the display; Specifically, be connected with one road comparator in the digital data transmission circuit between the digital signal input end of the digital signal output end of described CPU and display; Be connected with other one road comparator in the digital data transmission circuit between the digital signal input end of the digital signal output end of described display and CPU; Line output again after by the two-way comparator digital signal level that receives and reference voltage being compared.
Further, between the input of the digital signal output end of described CPU or display and comparator, be connected with the triode that is used to drive; Between the digital signal input end of the output of described comparator and described display or CPU, be connected with the triode that is used for the level match conversion.
Further again, the described triode that is used to drive is a NPN type triode, its base stage connects the digital signal output end of described CPU or display, grounded emitter, collector electrode respectively with corresponding connection of in-phase input end of first DC power supply and comparator, the inverting input of described comparator connects reference voltage; The amplitude of described reference voltage is lower than the amplitude of described first DC power supply.
Further again, the described triode that is used for the level match conversion is a NPN type triode, and its base stage connects the output of comparator, grounded emitter, collector electrode respectively with corresponding connection of digital signal input end of second DC power supply and described display or CPU; The amplitude of described second DC power supply equals the desired level magnitude of digital signal input end of described display or CPU.
Further, the amplitude of described first DC power supply is greater than the amplitude of second DC power supply.
Compared with prior art, advantage of the present utility model and good effect are: digital signal communicating circuit of the present utility model is by increasing comparator in the transmission line of digital signal, can enhancing signal the antijamming capability of transmission, improve the reliability of communicating circuit.Be applied in the circuit system design of air-conditioning product, the generation of the problems such as air conditioner fault that can effectively avoid data mistake in communication process, to occur and cause, even improve the baud rate of data communication, also can guarantee the accurate transmission of signal, thereby improve air-conditioning product reliability of operation and stability.
After reading the detailed description of the utility model execution mode in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the circuit theory diagrams of a kind of embodiment of the digital signal communicating circuit that proposes of the utility model;
Fig. 2 is the schematic diagram of the digital signal communicating circuit on the display panel in the air conditioner;
Fig. 3 is the schematic diagram of the digital signal communicating circuit on the control board in the air conditioner.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
Embodiment one, present embodiment is in order to improve the antijamming capability of digital signal in communication process, increase comparator at the circuit that is used for transmission of digital signals, the digital signal level and the reference voltage of input are compared back output, thereby make the digital signal waveform of output not only have stronger load capacity, and can filter out the interference signal of sneaking in the waveform, the reliability of enhancing signal transmission.
Referring to shown in Figure 1, IN is the input terminal that is used for receiving digital signals; OUT is the lead-out terminal that is used to export digital signal, is provided with comparator IC01 in the digital data transmission circuit between described input terminal IN and lead-out terminal OUT, to be used for that the waveform of digital signal is carried out shaping output.
In order further to improve driving force, in the communicating circuit of present embodiment, also be provided with the first triode Q01 that drives usefulness, as shown in Figure 1, can specifically select a NPN type triode to carry out circuit design.The base stage of described triode Q01 is connected input terminal IN by resistance R 01, grounded emitter, collector electrode connects the first DC power supply VCC1 by current-limiting resistance R02 on the one hand, connects the input of comparator IC01 on the other hand, and present embodiment is to connect in-phase input end+be that example describes.The inverting input of comparator IC01-connection reference voltage VREF, output connects the second triode Q02.The amplitude of described reference voltage VREF should be lower than the amplitude of the first DC power supply VCC1, and the potential-divider network that specifically can adopt divider resistance R03, R04 to form carries out obtaining after the dividing potential drop to the first DC power supply VCC1.Can change the amplitude of reference voltage VREF by the resistance of adjusting divider resistance R03, R04.For the communicating circuit of present embodiment, the amplitude of described reference voltage VREF is preferably smaller or equal to half of the described first DC power supply VCC1 amplitude, to realize the accurate shaping to digital signal waveform.Certainly, described reference voltage VREF also can directly adopt independent voltage source output to provide, and present embodiment is not limited in above giving an example.
In the present embodiment, use the second triode Q02 to be used for the digital signal level by comparator IC01 output is carried out matched transform, so that can satisfy the desired level magnitude of digital signal input pin of back level receiver module by the digital signal level of lead-out terminal OUT output.The described second triode Q02 also can adopt a NPN type triode to carry out circuit design, as shown in Figure 1, its base stage connects the output of comparator IC01 by resistance R 05, grounded emitter, collector electrode connects the second DC power supply VCC2 by current-limiting resistance R06 on the one hand, connects described lead-out terminal OUT on the other hand.Wherein, the amplitude of the described second DC power supply VCC2 should equal the desired level magnitude of digital signal input pin of back level receiver module.Because the first triode Q01 and comparator IC01 are used to improve the driving force of communicating circuit, therefore, the amplitude of the first DC power supply VCC1 should be higher than the amplitude of the second DC power supply VCC2, improves communicating circuit voltage to reach, and reduces the purpose of design that signal disturbs.
The operation principle of communicating circuit shown in Figure 1 is: after the digital signal waveform that receives by input terminal IN carries out anti-phase processing through the first triode Q01, output amplitude is the pulse waveform signal of VCC1, transfer to the in-phase input end of comparator IC01+, and then with inverting input-on reference voltage VREF compare after, the impulse waveform behind the output Shaping.Use comparator IC01, disturb the ripple of making an uproar even in transmission course, sneak into by the pulse waveform signal of first triode Q01 output, make and produce burr on the waveform, but after comparing through comparator IC01 and reference voltage VREF, can filtering burr on it, make the waveform signal of output totally stable.At this moment, still the waveform with the digital signal that receives is opposite for the impulse waveform of exporting by comparator IC01, after utilizing the second triode Q02 that this impulse waveform is done further reciprocal transformation, can output amplitude be VCC2 and with the synchronous digital signal of the digital signal waveform that receives, then, export back grade digital signal receiver module to by lead-out terminal OUT, finish communication task.
Be example with the air-conditioning product below, elaborate the concrete application of digital signal communicating circuit shown in Figure 1 in electronic product.
Embodiment two, and present embodiment is that example describes so that digital signal communicating circuit shown in Figure 1 to be set between CPU in air conditioner room unit and the display, referring to Fig. 2, shown in Figure 3.
In present air conditioner room unit, the CPU operated by rotary motion is on control board, and the display operated by rotary motion is carried out data communication by the digital data transmission cable that is plugged between socket CN08, the CN2 between control board and the display panel on display panel.Fig. 2 is the communicating circuit schematic diagram that is arranged on the display panel, and wherein, input terminal IN2 connects the digital signal output end of display, and lead-out terminal OUT1 connects the digital signal input end of display.Fig. 3 is the communicating circuit schematic diagram that is arranged on the control board, and wherein, input terminal IN1 connects the digital signal output end of CPU, and lead-out terminal OUT2 connects the digital signal input end of CPU.Between input terminal IN1 on the control board and the lead-out terminal OUT1 on the display panel, be connected with triode Q1, the comparator IC2 that is used to drive and be used for triode Q2 that the digital signal of comparator IC2 output is carried out the level match conversion.Between input terminal IN2 on the display panel and the lead-out terminal OUT2 on the control board, be connected with triode Q3, the comparator IC4 that is used to drive and be used for triode Q4 that the digital signal of comparator IC4 output is carried out the level match conversion.Described triode Q1～Q4 can adopt NPN type triode to carry out concrete circuit design equally.
In the present embodiment, connect to drive with first DC power supply of triode Q1, Q3 with+the 12V DC power supply is that example describes, this DC power supply provides operating voltage for comparator IC2, IC4 simultaneously; Connect the level match conversion with second DC power supply of triode Q2, Q4 with+the 5V DC power supply is that example describes, with CPU and display in the coupling air-conditioning system to the level requirement of its access signal.
Its operation principle is: when CPU need be when display sends digital signal, CPU is by its digital signal output end output digital signal, transfer to triode Q1 through IN1 and carry out the waveform reciprocal transformation, and after improving its waveforms amplitude, 3 pin by socket CN08 transfer to display panel through cable.Described display panel receives the digital signal that control board is sent by 3 pin of socket CN2, transfer to after comparator IC2 and reference voltage (reference voltage by+12V DC power supply dividing potential drop obtain) compare, export stable waveform signal, after triode Q2 does further reciprocal transformation, output amplitude is+digital signal waveform of 5V, OUT1 is sent to display through lead-out terminal, shows that with control relevant informations such as operational mode to current air conditioner, indoor temperature, design temperature show.
When display needs feedback digital signal to CPU, display is by its digital signal output end output digital signal, transfer to after triode Q3 carries out waveform transformation and improve its load capacity through the IN2 on the display panel, 3 pin by socket CN2 transfer to control board equally.Described control board receives the digital signal that display panel is sent by 3 pin of the socket CN08 on it, transfer to comparator IC4 with after filtering out the disturbing pulse on the digital signal waveform, after triode Q4 carries out waveform reciprocal transformation and amplitude matching treatment, OUT2 transfers to CPU by lead-out terminal, to finish the feedback transmission process of digital signal.
By the communicating circuit of Fig. 2, Fig. 3 as can be seen: because digital signal all needs to transmit through 3 pin of socket CN2, CN08 in transmission course, therefore, CPU is when display sends digital signal, waveform signal by triode Q1 conversion output also has been transferred on the digital signal input end of CPU through comparator IC4 and triode Q4 on the control board when transferring to display panel.Can normally move in order to ensure system, the CPU of present embodiment should be operated under the semiduplex mode, the digital signal that its digital signal input end of shielding receives in the process that sends data; Pending data is opened its digital signal input end after sending and finishing, and waits for the digital signal that receives the display feedback.In like manner, the display part also needs to be operated under the semiduplex mode, with accurate receiving digital signals.
Adopt the digital signal communicating circuit that the utility model proposed, can strengthen the driving force of communicating circuit, improve the reliability of signal transmission, satisfy different communication speeds, reduce the fault probability of happening of air conditioner.
Certainly; the above only is a kind of preferred implementation of the present utility model; should be noted that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1. digital signal communicating circuit, comprise input terminal that is used for receiving digital signals and the lead-out terminal that is used to export digital signal, it is characterized in that: be connected with comparator in the digital data transmission circuit between described input terminal and lead-out terminal, digital signal level and the reference voltage that receives compared back output by described comparator.
2. digital signal communicating circuit according to claim 1 is characterized in that: be connected with first triode that drives usefulness between the input of described input terminal and comparator; Between the output of described comparator and described lead-out terminal, be connected with second triode that is used for the digital signal level of comparator output is carried out matched transform.
3. digital signal communicating circuit according to claim 2, it is characterized in that: described first triode is a NPN type triode, its base stage connects described input terminal, grounded emitter, collector electrode respectively with corresponding connection of in-phase input end of first DC power supply and described comparator, the inverting input of described comparator connects reference voltage; The amplitude of described reference voltage is lower than the amplitude of described first DC power supply.
4. according to claim 2 or 3 described digital signal communicating circuits, it is characterized in that: described second triode is a NPN type triode, its base stage connects the output of described comparator, grounded emitter, and collector electrode is connected with described lead-out terminal is corresponding with second DC power supply respectively; The amplitude of described second DC power supply equals the desired level magnitude of digital signal input pin of digital signal receiver module.
5. digital signal communicating circuit according to claim 4 is characterized in that: the amplitude of described first DC power supply is greater than the amplitude of second DC power supply.
6. an air conditioner comprises CPU and display, it is characterized in that: be connected with one road comparator in the digital data transmission circuit between the digital signal input end of the digital signal output end of described CPU and display; Be connected with other one road comparator in the digital data transmission circuit between the digital signal input end of the digital signal output end of described display and CPU; By the two-way comparator digital signal level and the reference voltage that receives compared back output.
7. air conditioner according to claim 6 is characterized in that: be connected with the triode that is used to drive between the input of the digital signal output end of described CPU or display and comparator; Between the digital signal input end of the output of described comparator and described display or CPU, be connected with the triode that is used for the level match conversion.
8. air conditioner according to claim 7, it is characterized in that: the described triode that is used to drive is a NPN type triode, its base stage connects the digital signal output end of described CPU or display, grounded emitter, collector electrode respectively with corresponding connection of in-phase input end of first DC power supply and comparator, the inverting input of described comparator connects reference voltage; The amplitude of described reference voltage is lower than the amplitude of described first DC power supply.
9. according to claim 7 or 8 described air conditioners, it is characterized in that: the described triode that is used for the level match conversion is a NPN type triode, its base stage connects the output of comparator, grounded emitter, collector electrode respectively with corresponding connection of digital signal input end of second DC power supply and described display or CPU; The amplitude of described second DC power supply equals the desired level magnitude of digital signal input end of described display or CPU.
10. air conditioner according to claim 9 is characterized in that: the amplitude of described first DC power supply is greater than the amplitude of second DC power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206959226U CN202014233U (en) | 2010-12-24 | 2010-12-24 | Digital signal communication circuit and air conditioner equipped therewith |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206959226U CN202014233U (en) | 2010-12-24 | 2010-12-24 | Digital signal communication circuit and air conditioner equipped therewith |
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| CN202014233U true CN202014233U (en) | 2011-10-19 |
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| CN2010206959226U Expired - Fee Related CN202014233U (en) | 2010-12-24 | 2010-12-24 | Digital signal communication circuit and air conditioner equipped therewith |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296918A (en) * | 2013-07-03 | 2013-09-11 | 中国船舶重工集团公司第七二四研究所 | Generating circuit for applying transient interference signals to low-voltage direct-current power supply |
| CN103363616A (en) * | 2012-04-06 | 2013-10-23 | 珠海格力电器股份有限公司 | Air conditioner and controlling method, controlling terminal and controlling system of air conditioner |
| CN105352138A (en) * | 2015-12-04 | 2016-02-24 | 珠海格力电器股份有限公司 | Null line and firing line communication monitoring method and device for indoor unit and outdoor unit of inverter air conditioner and air conditioner system |
| CN105391657A (en) * | 2015-11-09 | 2016-03-09 | 上海斐讯数据通信技术有限公司 | Anti-interference apparatus of series signal and network equipment |
| CN107544300A (en) * | 2017-08-21 | 2018-01-05 | 珠海格力电器股份有限公司 | A kind of interface processing device and its control method |
-
2010
- 2010-12-24 CN CN2010206959226U patent/CN202014233U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103363616A (en) * | 2012-04-06 | 2013-10-23 | 珠海格力电器股份有限公司 | Air conditioner and controlling method, controlling terminal and controlling system of air conditioner |
| CN103363616B (en) * | 2012-04-06 | 2016-04-20 | 珠海格力电器股份有限公司 | Air-conditioner and control method, control terminal and control system |
| CN103296918A (en) * | 2013-07-03 | 2013-09-11 | 中国船舶重工集团公司第七二四研究所 | Generating circuit for applying transient interference signals to low-voltage direct-current power supply |
| CN105391657A (en) * | 2015-11-09 | 2016-03-09 | 上海斐讯数据通信技术有限公司 | Anti-interference apparatus of series signal and network equipment |
| CN105352138A (en) * | 2015-12-04 | 2016-02-24 | 珠海格力电器股份有限公司 | Null line and firing line communication monitoring method and device for indoor unit and outdoor unit of inverter air conditioner and air conditioner system |
| CN105352138B (en) * | 2015-12-04 | 2018-06-22 | 珠海格力电器股份有限公司 | Zero firewire of transducer air conditioning internal-external machine communication monitoring method, device and air-conditioning system |
| CN107544300A (en) * | 2017-08-21 | 2018-01-05 | 珠海格力电器股份有限公司 | A kind of interface processing device and its control method |
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Granted publication date: 20111019 Termination date: 20171224 |
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