CN208952322U - Optocoupler communicating circuit, communication chip and air-conditioning - Google Patents
Optocoupler communicating circuit, communication chip and air-conditioning Download PDFInfo
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- CN208952322U CN208952322U CN201821246598.2U CN201821246598U CN208952322U CN 208952322 U CN208952322 U CN 208952322U CN 201821246598 U CN201821246598 U CN 201821246598U CN 208952322 U CN208952322 U CN 208952322U
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Abstract
This application involves a kind of optocoupler communicating circuit, communication chip and air-conditionings, including signal delivery module, amplification module, photo-coupler and signal receiving module；The photo-coupler includes input terminal and output end；The signal delivery module, the amplification module and the input terminal form the first circuit；The signal receiving module and the output end form second servo loop；When the signal delivery module inputs the first signal, first circuit is in the conductive state, the amplification module amplifies the electric current in first circuit, and the electric current of the second servo loop is made to be less than the product of the electric current in first circuit and the current transfer ratio of the photo-coupler.Using the technical solution of the application, communication abnormality phenomenon can be reduced, reduces communication failure rate.
Description
Technical field
This application involves optocoupler communication technique fields, and in particular to a kind of optocoupler communicating circuit, communication chip and air-conditioning.
Background technique
Air conditioner industry mainstream communication modes are at present with 485 communications and universal asynchronous receiving-transmitting transmitter (Universal
Asynchronous Receiver/Transmitter, UART) communication based on.Both communication modes communication both ends require
Signal isolation processing is carried out, and it is exactly to be isolated by optocoupler that the processing mode being isolated is most generally most suitable.
But due to optocoupler self-characteristic, temperature to current transfer ratio (Current transfer ratio,
CTR) influence is very big, may cause signal identification mistake, to communication abnormality occur, communication failure rate is higher.
Utility model content
In view of this, the application provides a kind of optocoupler communicating circuit, communication chip and air-conditioning, it is in the prior art to solve
The higher problem of optocoupler communicating circuit communication failure rate.
According to the embodiment of the present application in a first aspect, provide a kind of optocoupler communicating circuit, including signal delivery module, amplification
Module, photo-coupler and signal receiving module；
The photo-coupler includes input terminal and output end；
The signal delivery module, the amplification module and the input terminal form the first circuit；
The signal receiving module and the output end form second servo loop；
When the signal delivery module inputs the first signal, first circuit is in the conductive state, the amplification module
The electric current in first circuit is amplified, make the second servo loop electric current be less than first circuit electric current with it is described
The product of the current transfer ratio of photo-coupler.
Further, in optocoupler communicating circuit described above, the amplification module includes amplifier and first resistor；
The amplifier and the signal delivery module are connected with the first resistor.
Further, in optocoupler communicating circuit described above, the amplifier is NPN type triode；
The first resistor is connected with the base stage of the NPN type triode；
The collector of the NPN type triode is connected with the cathode of the input terminal；
The emitter of the NPN type triode is connected with ground terminal.
Further, in optocoupler communicating circuit described above, first signal is high level signal.
Further, in optocoupler communicating circuit described above, the amplifier is PNP type triode；
The first resistor is connected with the base stage of the PNP type triode；
The collector of the PNP type triode is connected with the anode of the input terminal；
The emitter of the PNP type triode is connected with power supply.
Further, in optocoupler communicating circuit described above, first signal is low level signal.
Further, in optocoupler communicating circuit described above, the amplifier is NMOS tube；
The first resistor is connected with the grid of the NMOS tube；
The drain electrode of the NMOS tube is connected with the cathode of the input terminal；
The source electrode of the NMOS tube is connected with ground terminal.
Further, in optocoupler communicating circuit described above, the amplifier is PMOS tube；
The first resistor is connected with the grid of the PMOS tube；
The drain electrode of the PMOS tube is connected with the anode of the input terminal；
The source electrode of the PMOS tube is connected with power supply.
It further, further include second resistance in optocoupler communicating circuit described above；
The second resistance is serially connected between power supply and the input terminal, alternatively, second resistance concatenation ground connection
Between end and the input terminal.
Further, in optocoupler communicating circuit described above, the optocoupler communicating circuit is applied to 485 communication modes
In communication apparatus.
Further, in optocoupler communicating circuit described above, the optocoupler communicating circuit is applied to universal asynchronous receiving-transmitting
In the communication apparatus of transmitter UART communication modes.
Further, described when the signal delivery module inputs second signal in optocoupler communicating circuit described above
First circuit and the second servo loop are in off state.
According to the second aspect of the embodiment of the present application, a kind of communication chip is provided, is provided with optocoupler communication as described above
Circuit.
According to the third aspect of the embodiment of the present application, a kind of air-conditioning, including interior mainboard, outer mainboard and institute as above are provided
The optocoupler communicating circuit stated；
The interior mainboard and the outer mainboard are connected with the optocoupler communicating circuit respectively.
Optocoupler communicating circuit, communication chip and the air-conditioning of the application, by the defeated of signal delivery module and photo-coupler
Enter and amplification module is set between end, when so that photo-coupler being connected, the electric current I in the first circuitFIt is amplified, guarantees photo-coupler temperature
When degree changes, still meet IC≤IF* CTR realizes mainboard in the case where temperature changes, still can be with identification signal
The input signal of delivery module.Using the technical solution of the application, communication abnormality phenomenon can be reduced, reduces communication failure rate.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The application can be limited.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the application
Example, and together with specification it is used to explain the principle of the application.
Fig. 1 is the schematic diagram of the optocoupler communicating circuit of the prior art；
Fig. 2 is the application schematic diagram of optocoupler communicating circuit in Fig. 1；
Fig. 3 is the structural schematic diagram of the optocoupler communicating circuit of the application；
Fig. 4 is a kind of schematic diagram of the optocoupler communicating circuit of the application.
Fig. 5 is another schematic diagram of the optocoupler communicating circuit of the application.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects be described in detail in claims, the application.
Fig. 1 is the schematic diagram of the optocoupler communicating circuit of the prior art, and Fig. 2 is the application signal of optocoupler communicating circuit in Fig. 1
Figure, as depicted in figs. 1 and 2, optocoupler communicating circuit in the prior art is by signal delivery module TX, second resistance R2, optical coupling
Device U1, signal receiving module RX and 3rd resistor R3 composition, signal delivery module TX, second resistance R2 and photo-coupler U1 are formed
First circuit, photo-coupler U1, signal receiving module RX and 3rd resistor R3 form second servo loop.The optocoupler communicating circuit structure
Simply, low in cost, only two optocoupler communicating circuits need to be set, the communication between two communication mainboard U2 can be realized, still
It is confined to the influence of communication two party mainboard U2, mainboard U2 is received, and transmission electric current needs to be less than 4mA or less and guarantees that mainboard U2 is long-term
Reliability service.In addition mainboard U2 identifies the low and high level for receiving signal, and level is greater than 2.4V and is considered high electricity
Flat, level is less than 0.6V and is considered low level, and level level between 0.6V-2.4V can not identify.So while mainboard
The parameter of U2 are as follows: electric current I≤4mA, high level VH>=2.4V, low level VL≤0.6V。
Specifically, as shown in Figure 1, IF≤ 4mA, power supply VCC are loaded after second resistance R2, when signal delivery module
When TX input high level, the first loop current IF=0, second servo loop electric current IC(the secondary side output end U12 of=0, photo-coupler U1
Triode) cut-off, the voltage of signal receiving module RX is 3.3V, is met the requirements；When signal delivery module TX input low level,
Need to guarantee the output end U12 saturation conduction I of photo-coupler U1C≤IF* when CTR, the voltage of signal receiving module RX is equal to optocoupler
Output end U12 saturation conduction the pressure drop 0.4V, i.e. V of clutch U1ce=0.4V, meets the requirements less than 0.6V；Assuming that optical coupling secondary edges three
Pole pipe saturation conduction state IC=(3.3-0.4)/R3, as long as R3 is sufficiently large, ICCondition can be met: IC≤IF*CTR.But
When being less than milliampere rank for ordinary optical coupler U11, photo-coupler U1 switch time will become very long, may cause letter
Number identification mistake, be greater than 9600bps baud rate communication on be easy to appear communication abnormality.Under condition limitation as above, work as light
Coupler U1, since CTR changes, may cause I under the influence of temperatureC≥IF*CTR.Photo-coupler U1 not in saturation conduction, this
When RX=3.3-ICR3 >=0.6V identify mainboard U2 can not, lead to communication failure.
Therefore, in order to solve the above-mentioned technical problem, following technical scheme is present embodiments provided.
Fig. 3 is the structural schematic diagram of the optocoupler communicating circuit of the application, as shown in figure 3, the optocoupler of the present embodiment communicates electricity
Road is additionally arranged amplification module T on the basis of Fig. 1, can specifically include signal delivery module TX, amplification module T, the second electricity
Hinder R2, photo-coupler U1 and signal receiving module RX；Photo-coupler U1 includes input terminal U11 and output end U12；Signal transmits mould
Block TX, amplification module T and input terminal U11 form the first circuit, for example, second resistance R2 concatenates power supply in the first loop
Between VCC and input terminal, alternatively, second resistance R2 is concatenated in the first loop between ground terminal GND and input terminal；Signal receives
Module RX and output end U12 forms second servo loop.
During a specific implementation, amplification module T can be controlled by second resistance R2 and is in saturation region, signal passes
Send module TX input the first signal when, can with when amplification module T be connected so that input terminal U11 be connected, such first circuit
I.e. in the conductive state, the electric current in the first circuit can be amplified module T and amplify an order of magnitude, in the feelings that other designs are constant
It is to change on the former order of magnitude, and the electric current in the first circuit increases an order of magnitude when being affected by temperature due to CTR under condition
Afterwards, the electric current I of second servo loop can be madeCLess than the electric current I in the first circuitFWith the product of the CRT of photo-coupler U1, that is, meet IC
≤IF* CTR, mainboard U2 can be reduced with the input signal of identification signal delivery module TX and the phenomenon that communication abnormality occurred, be reduced
Communication failure rate.When signal delivery module TX inputs second signal, the first circuit is in off state, so that second
Circuit is also at off state, and RX=3.3V meets the requirements.
It should be noted that photo-coupler U1 electric current itself cannot be too big, the present embodiment is preferably amplified first time
Road electric current is less than 100mA.
The optocoupler communicating circuit of the present embodiment, by the input terminal U11 of signal delivery module TX and photo-coupler U1 it
Between be arranged amplification module T so that photo-coupler U1 be connected when, the electric current I in the first circuitFIt is amplified, guarantees photo-coupler U1 temperature
When degree changes, still meet IC≤IF* CTR realizes mainboard U2 in the case where temperature changes, can still identify letter
The input signal of number delivery module TX.Using the technical solution of the application, communication abnormality phenomenon can be reduced, reduces communication failure
Rate.
Fig. 4 is a kind of schematic diagram of the optocoupler communicating circuit of the application, as shown in figure 4, in the present embodiment, amplification module T
Including amplifier and first resistor R1, amplifier and signal delivery module TX are connected with first resistor R1.Wherein, amplifier can
Think NPN type triode Q1；First resistor R1 is connected with the base stage b1 of NPN type triode Q1；The collector of NPN type triode Q1
C1 is connected with the cathode of input terminal U11；The emitter e 1 of NPN type triode Q1 is connected with ground terminal GND；Second resistance R2 with it is defeated
Enter to hold the anode of U11 to be connected.
During a specific implementation, NPN type triode Q1 can be controlled by second resistance R2 and be maintained at saturation region,
In this way, being divided by first resistor R1 so that NPN type triode Q1 is led when signal delivery module TX input high level signal
It is logical, when power supply VCC powers to photo-coupler U1, through second resistance R2 current limliting, partial pressure so that LEDs ON, in turn
Phototriode is connected, the first loop current IFAn order of magnitude can be amplified by NPN type triode Q1, obtain one relatively
Biggish electric current, and the electric current of no longer acceptor's plate U2 influences, and improves communication quality.
Specifically, when signal delivery module TX input high level signal, NPN type triode Q1 are connected, photo-coupler U1 is led
Lead to, at this moment IF=(VCC-VF-VCES)/(R4+RCE), wherein VFFor light emitting diode saturation voltage drop, 1.3V, V are generally takenCESFor
NPN type triode Q1 saturation voltage drop, generally takes 0.2V, RCEFor the equivalent electricity between NPN type triode Q1 collector and emitter
Resistance, NPN type triode Q1 are equivalent to 0, i.e. I when being saturatedF=(VCC-VF-VCES)/R4, so IFIt is determined by R4, and no longer acceptor's plate
The electric current of U2 influences, and can satisfy IC≤IF* CTR, realizing mainboard U2 still can transmit mould at any temperature with identification signal
The input signal of block TX.Using the technical solution of the application, communication abnormality phenomenon can be reduced, reduces communication failure rate.
In practical applications, NPN type triode Q1 can also be replaced with NMOS tube by amplifier；Accordingly, first resistor
R1 is connected with the grid of NMOS tube；The drain electrode of NMOS tube is connected with the cathode of input terminal U11；The source electrode and ground terminal of NMOS tube
GND is connected；Second resistance R2 is connected with the anode of input terminal U11.The optocoupler of its realization principle and embodiment illustrated in fig. 4 communication electricity
The realization mechanism on road is identical, please refers to above-mentioned related record in detail, details are not described herein.
Fig. 5 is another schematic diagram of the optocoupler communicating circuit of the application, as shown in figure 5, amplifier can in the present embodiment
Think PNP type triode Q2；First resistor R1 is connected with the base stage of PNP type triode Q2；The collector of PNP type triode Q2 with
The anode of input terminal U11 is connected；The emitter of PNP type triode Q2 is connected with power supply VCC；Second resistance R2 respectively with it is defeated
Enter to hold the cathode of U11 to be connected with ground terminal GND.
The present embodiment is only that the triode model of use is different from the difference of embodiment illustrated in fig. 4, and when signal transmits
When module TX input high level signal, the conducting of the first circuit, when signal delivery module TX input low level signal, the first circuit is cut
Only, but its realization principle is identical as the realization mechanism of optocoupler communicating circuit of embodiment illustrated in fig. 4, please refers to above-mentioned correlation in detail
It records, details are not described herein.
In practical applications, PNP type triode Q2 can also be replaced with PMOS tube by amplifier；Accordingly, first resistor
R1 is connected with the grid of PMOS tube；The drain electrode of PMOS tube is connected with the anode of input terminal U11；The source electrode and power supply of PMOS tube
VCC is connected；Second resistance R2 is connected with the cathode of input terminal U11 and ground terminal GND respectively.Its realization principle and reality shown in Fig. 5
The realization mechanism for applying the optocoupler communicating circuit of example is identical, please refers to above-mentioned related record in detail, details are not described herein.
In practical applications, the optocoupler communicating circuit of the present embodiment can be applied in the communication apparatus of 485 communication modes,
It can also apply in the communication apparatus of UART communication modes, the present embodiment is not particularly limited.
The application also provides a kind of communication chip, and the communication electricity of optocoupler described in embodiment as above is provided in the communication chip
Road.
The application also provides a kind of air-conditioning, which includes interior mainboard U2, outer mainboard U2 and as weighed upper embodiment
Optocoupler communicating circuit；
Interior mainboard U2 and outer mainboard U2 are connected with optocoupler communicating circuit respectively, interior mainboard U2 and outer mainboard U2 benefit
It is realized and is communicated with the optocoupler communicating circuit.
It is understood that same or similar part can mutually refer in the various embodiments described above, in some embodiments
Unspecified content may refer to the same or similar content in other embodiments.
It should be noted that term " first ", " second " etc. are used for description purposes only in the description of the present application, without
It can be interpreted as indication or suggestion relative importance.In addition, in the description of the present application, unless otherwise indicated, the meaning of " multiple "
Refer at least two.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the application.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although embodiments herein has been shown and described above, it is to be understood that above-described embodiment is example
Property, it should not be understood as the limitation to the application, those skilled in the art within the scope of application can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (14)
1. a kind of optocoupler communicating circuit, which is characterized in that connect including signal delivery module, amplification module, photo-coupler and signal
Receive module；
The photo-coupler includes input terminal and output end；
The signal delivery module, the amplification module and the input terminal form the first circuit；
The signal receiving module and the output end form second servo loop；
When the signal delivery module inputs the first signal, first circuit is in the conductive state, and the amplification module is to institute
The electric current for stating the first circuit amplifies, and the electric current of the second servo loop is made to be less than the electric current and the optocoupler in first circuit
The product of the current transfer ratio of clutch.
2. optocoupler communicating circuit according to claim 1, which is characterized in that the amplification module includes amplifier and first
Resistance；
The amplifier and the signal delivery module are connected with the first resistor.
3. optocoupler communicating circuit according to claim 2, which is characterized in that the amplifier is NPN type triode；
The first resistor is connected with the base stage of the NPN type triode；
The collector of the NPN type triode is connected with the cathode of the input terminal；
The emitter of the NPN type triode is connected with ground terminal.
4. optocoupler communicating circuit according to claim 3, which is characterized in that first signal is high level signal.
5. optocoupler communicating circuit according to claim 2, which is characterized in that the amplifier is PNP type triode；
The first resistor is connected with the base stage of the PNP type triode；
The collector of the PNP type triode is connected with the anode of the input terminal；
The emitter of the PNP type triode is connected with power supply.
6. optocoupler communicating circuit according to claim 5, which is characterized in that first signal is low level signal.
7. optocoupler communicating circuit according to claim 2, which is characterized in that the amplifier is NMOS tube；
The first resistor is connected with the grid of the NMOS tube；
The drain electrode of the NMOS tube is connected with the cathode of the input terminal；
The source electrode of the NMOS tube is connected with ground terminal.
8. optocoupler communicating circuit according to claim 2, which is characterized in that the amplifier is PMOS tube；
The first resistor is connected with the grid of the PMOS tube；
The drain electrode of the PMOS tube is connected with the anode of the input terminal；
The source electrode of the PMOS tube is connected with power supply.
9. optocoupler communicating circuit according to claim 1, which is characterized in that further include second resistance；
The second resistance is serially connected between power supply and the input terminal, alternatively, the second resistance concatenation ground terminal and
Between the input terminal.
10. -9 any optocoupler communicating circuit according to claim 1, which is characterized in that the optocoupler communicating circuit application
In the communication apparatus of 485 communication modes.
11. -9 any optocoupler communicating circuit according to claim 1, which is characterized in that the optocoupler communicating circuit application
In the communication apparatus of universal asynchronous receiving-transmitting transmitter UART communication modes.
12. -9 any optocoupler communicating circuit according to claim 1, which is characterized in that the signal delivery module input
When second signal, first circuit and the second servo loop are in off state.
13. a kind of communication chip, which is characterized in that be provided with optocoupler communicating circuit as claimed in claim 1.
14. a kind of air-conditioning, which is characterized in that including interior mainboard, outer mainboard and light as claimed in claim 1
Coupling communicating circuit；
The interior mainboard and the outer mainboard are connected with the optocoupler communicating circuit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821246598.2U CN208952322U (en) | 2018-08-03 | 2018-08-03 | Optocoupler communicating circuit, communication chip and air-conditioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821246598.2U CN208952322U (en) | 2018-08-03 | 2018-08-03 | Optocoupler communicating circuit, communication chip and air-conditioning |
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| Publication Number | Publication Date |
|---|---|
| CN208952322U true CN208952322U (en) | 2019-06-07 |
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| CN201821246598.2U Active CN208952322U (en) | 2018-08-03 | 2018-08-03 | Optocoupler communicating circuit, communication chip and air-conditioning |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108931034A (en) * | 2018-08-03 | 2018-12-04 | 珠海格力电器股份有限公司 | Optocoupler communicating circuit, communication chip and air-conditioning |
| CN113587385A (en) * | 2021-07-13 | 2021-11-02 | Tcl空调器(中山)有限公司 | Communication fault processing method and control system for indoor and outdoor units of air conditioner and air conditioner |
-
2018
- 2018-08-03 CN CN201821246598.2U patent/CN208952322U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108931034A (en) * | 2018-08-03 | 2018-12-04 | 珠海格力电器股份有限公司 | Optocoupler communicating circuit, communication chip and air-conditioning |
| CN108931034B (en) * | 2018-08-03 | 2023-11-17 | 珠海格力电器股份有限公司 | Optocoupler communication circuit, communication chip and air conditioner |
| CN113587385A (en) * | 2021-07-13 | 2021-11-02 | Tcl空调器(中山)有限公司 | Communication fault processing method and control system for indoor and outdoor units of air conditioner and air conditioner |
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