CN212692077U - Communication circuit and air conditioner - Google Patents
Communication circuit and air conditioner Download PDFInfo
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- CN212692077U CN212692077U CN202021397351.8U CN202021397351U CN212692077U CN 212692077 U CN212692077 U CN 212692077U CN 202021397351 U CN202021397351 U CN 202021397351U CN 212692077 U CN212692077 U CN 212692077U
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Abstract
The utility model provides a communication circuit and air conditioner, this communication circuit include the current input end of being connected with the air conditioner indoor set and the current output end of being connected with the air conditioner outdoor set, loop resistance module, controller, first controllable switch, second controllable switch, first resistance module, second resistance module and current acquisition circuit. The technical scheme of the utility model aim at solving because the resistance of loop resistance leads to the problem of the unable normal communication of air conditioner indoor set and off-premises station unusually.
Description
Technical Field
The utility model relates to an air conditioner technical field, in particular to communication circuit and air conditioner.
Background
At present, an indoor unit and an outdoor unit of a household variable frequency air conditioner mostly adopt a zero-live line communication circuit for communication, the zero-live line communication circuit is often composed of common devices such as a resistor, a capacitor, a diode, a triode, an optocoupler and the like, and hardware cost is low.
The on and off of the optocoupler in the zero-live wire communication circuit are determined by the loop current, and the magnitude of the loop current is influenced by the resistance value of the loop resistor, for example, when the resistance value of the loop resistor is abnormally increased, the loop current is reduced, which causes the optocoupler to be incapable of being switched on, and further causes the indoor unit and the outdoor unit to be incapable of normally communicating; when the resistance of the loop resistor is abnormally reduced, the loop current is increased, electronic components in the circuit are burnt out, the indoor unit and the outdoor unit can not normally communicate with each other, and normal use of the air conditioner by a user is affected.
SUMMERY OF THE UTILITY MODEL
The utility model provides a communication circuit and air conditioner aims at solving because the resistance of loop resistance leads to the problem of the unable normal communication of air conditioner indoor set and off-premises station unusually.
In order to achieve the above object, the present invention provides a communication circuit, which includes a current input terminal connected to an indoor unit of an air conditioner, and a current output terminal connected to the outdoor unit of the air conditioner, a loop resistance module, a controller, a first controllable switch, a second controllable switch, a first resistance module, a second resistance module, and a current collecting circuit;
the first end of the loop resistance module is connected with the current input end, and the second end of the loop resistance module is connected with the input end of the second controllable switch;
the output end of the second controllable switch is connected with the input end of the current acquisition circuit, the first output end of the current acquisition circuit is connected with the current output end, and the second output end of the current acquisition circuit is connected with the input end of the controller;
the first controllable switch is connected with the first resistance module in series and then connected with the loop resistance module in parallel, and the second resistance module is connected with the second controllable switch in parallel;
and a first output end of the controller is connected with a controlled end of the first controllable switch, and a second output end of the controller is connected with a controlled end of the second controllable switch.
Optionally, the current collecting circuit includes a sampling circuit and a signal amplifying circuit;
the input end of the sampling circuit is the input end of the current acquisition circuit; the output end of the sampling circuit is a first output end of the current acquisition circuit, and the output end of the sampling circuit is connected with the input end of the signal amplification circuit; the output end of the signal amplification circuit is the second output end of the current acquisition circuit.
Optionally, the sampling circuit includes a first resistor; the first end of the first resistor is the input end of the sampling circuit; the second end of the first resistor is the output end of the sampling circuit, and the second end of the first resistor is connected with the input end of the signal amplification circuit.
Optionally, the signal amplifying circuit includes a second resistor, a third resistor, a fourth resistor, and an operational amplifier;
a first end of the second resistor is an input end of the signal amplification circuit, and a second end of the second resistor is connected with a positive input end of the operational amplifier; the negative input end of the operational amplifier is connected with the first end of the third resistor and the first end of the fourth resistor; the second end of the third resistor is grounded; the output end of the operational amplifier is the output end of the signal amplification circuit, and the output end of the operational amplifier is connected with the second end of the fourth resistor.
Optionally, the loop resistance module includes a fifth resistor;
the first end of the fifth resistor is the first end of the loop resistor module, and the second end of the fifth resistor is the second end of the loop resistor module.
Optionally, the first resistance module includes a sixth resistance;
and the first controllable switch is connected with the sixth resistor in series and then connected with the loop resistor module in parallel.
Optionally, the second resistance module includes a seventh resistance;
the seventh resistor is connected in parallel with the second controllable switch.
Optionally, the first controllable switch is an NPN triode or a PNP triode; the second controllable switch is an NPN triode or a PNP triode.
In order to achieve the above object, the present invention provides an air conditioner, the air conditioner includes indoor set, off-premises station and as above arbitrary communication circuit, the indoor set with communication circuit's current input end is connected, the off-premises station with communication circuit's current output end is connected.
Optionally, the air conditioner further includes a power supply module, the indoor unit includes a first optical coupling switch circuit, and the outdoor unit includes a second optical coupling switch circuit;
the anode of the power supply module is connected with the input end of the first optical coupling switch circuit, and the output end of the first optical coupling switch circuit is connected with the current input end of the communication circuit;
the input end of the second optical coupling switch circuit is connected with the current output end of the communication circuit, and the output end of the second optical coupling switch circuit is connected with the negative electrode of the power supply module.
The technical scheme of the utility model is that the loop current in the circuit is collected by the current collecting circuit and fed back to the controller; when the loop current is too small, the controller controls the first controllable switch to be conducted, so that the first resistance module and the loop resistance module are connected in parallel to the circuit, the total resistance value in the circuit is reduced, the loop current is increased, and the photoelectric coupler in the indoor unit and the outdoor unit can be ensured to normally operate; when the loop current is too large, the controller controls the second controllable switch to be switched off, so that the second resistance module and the loop resistance module are connected in series to the circuit, the total resistance value in the circuit is increased, the loop current is reduced, electronic components in the circuit are prevented from being burnt out due to the fact that the loop current is too large, and by the arrangement, normal communication between the indoor unit and the outdoor unit of the air conditioner can be guaranteed, and the situation that the indoor unit and the outdoor unit of the air conditioner cannot normally communicate due to the fact that the loop resistance is abnormal is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a block diagram of a communication circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a hardware structure of an air conditioner according to an embodiment of the present invention;
fig. 3 is a block diagram of another embodiment of the communication circuit of the present invention;
fig. 4 is a schematic circuit diagram of a communication circuit according to an embodiment of the present invention.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Fig. 1 is a block diagram of a communication circuit according to an embodiment of the present invention.
Referring to fig. 1, the communication circuit 300 is applied to an air conditioner, such as an inverter air conditioner, and the communication circuit 300 includes a current input terminal IN connected to an indoor unit of the air conditioner, a current output terminal OUT connected to the outdoor unit of the air conditioner, a loop resistance module 20, a controller 10, a first controllable switch 30, a second controllable switch 50, a first resistance module 40, a second resistance module 60, and a current collecting circuit 70.
A first terminal of the loop resistance module 20 is connected to the current input terminal IN, and a second terminal of the loop resistance module 20 is connected to the input terminal 502 of the second controllable switch 50; the output 503 of the second controllable switch 50 is connected to the input 701 of the current collecting circuit 70; the first output terminal 702 of the current collecting circuit 70 is connected to the current output terminal OUT, and the second output terminal 703 of the current collecting circuit 70 is connected to the input terminal 101 of the controller 10; the first controllable switch 30 is connected in series with the first resistor module 40 and then connected in parallel with the loop resistor module 20; and a second resistance module 60 is connected in parallel with the second controllable switch 50; the first output terminal 102 of the controller 10 is connected to the controlled terminal 301 of the first controllable switch 30, and the second output terminal 103 of the controller 10 is connected to the controlled terminal 501 of the second controllable switch 50.
The controller 10 may be a single chip, a DSP or a microprocessor such as an FPGA.
The first controllable switch 30 has two states of on or off, and the first controllable switch 30 may be an NPN transistor or a PNP transistor, an N-MOS transistor or a P-MOS transistor, or other switch transistors capable of being implemented.
The second controllable switch 50 has two states of on or off, and the second controllable switch 50 may be an NPN transistor or a PNP transistor, an N-MOS transistor or a P-MOS transistor, or other switch transistors capable of being implemented.
The first resistor module 40 is connected in parallel with the loop resistor module 20 to the circuit when the first controllable switch 30 is turned on, so as to reduce the total resistance of the communication circuit 300. The first resistor module 40 may be composed of a single resistor or a plurality of resistors connected in series.
The second resistor module 60 is used to connect in series with the loop resistor module 20 to increase the total resistance of the communication circuit 300 when the second controllable switch 50 is turned off. The second resistor module 60 may be composed of a single resistor or a plurality of resistors connected in series.
The loop resistance module 20 may be composed of a single resistor or a plurality of resistors connected in series.
The current collection circuit 70 may be composed of a sampling circuit and a signal amplification circuit, or may be a dedicated device or module having a current collection function.
In this embodiment, the communication circuit 300 is used to realize communication between the indoor unit and the outdoor unit of the air conditioner. In an embodiment, referring to fig. 2, the air conditioner includes an indoor unit, an outdoor unit and a power module 100, and the indoor unit of the air conditioner includes a first optical coupling switch circuit 200, and the first optical coupling switch circuit 200 includes a first optical coupler OP1, a third optical coupler OP3 and a first switch tube T1.
A collector of the third photoelectric coupler OP3 is connected to a power supply VCC, and an emitter of the third photoelectric coupler OP3 is connected to a signal receiving terminal RXD1 of the indoor unit; the positive electrode of the light emitting diode of the third photocoupler OP3 is connected with the positive electrode of the power module 100 of the air conditioner, and the negative electrode of the light emitting diode of the third photocoupler OP3 is connected with the collector of the first photocoupler OP 1; the emitter of the first photocoupler OP1 is connected with the current input end of the communication circuit 300; the anode of the light emitting diode of the first photocoupler OP1 is connected with a power supply VCC, and the cathode of the light emitting diode of the first photocoupler OP1 is connected with the input end of the first switch tube T1; the output terminal of the first switch tube T1 is grounded, and the controlled terminal of the first switch tube T1 is connected to the signal transmitting terminal TXD1 of the indoor unit.
The outdoor unit of the air conditioner includes a second optical coupling switch circuit 400, and the second optical coupling switch circuit 400 includes a second optical coupler OP2, a fourth optical coupler OP4, and a second switching tube T2.
A collector of the fourth photoelectric coupler OP4 is connected to a power VCC, and an emitter of the fourth photoelectric coupler OP4 is connected to a signal receiving terminal RXD2 of the outdoor unit; the negative electrode of the light emitting diode of the fourth photocoupler OP4 is connected with the negative electrode of the power module 100 of the air conditioner, and the positive electrode of the light emitting diode of the fourth photocoupler OP4 is connected with the emitter of the second photocoupler OP 2; the collector of the second photocoupler OP2 is connected with the current output end of the communication circuit 300; the anode of the light emitting diode of the second photocoupler OP2 is connected with a power supply VCC; the cathode of the light emitting diode of the second photocoupler OP2 is connected with the input end of a second switch tube T2; the output terminal of the second switch tube T2 is grounded, and the controlled terminal of the second switch tube T2 is connected to the signal transmitting terminal TXD2 of the outdoor unit of the air conditioner. The communication circuit 300 of the present embodiment is used to realize the communication connection between the first optical coupling switch circuit 200 of the indoor unit of the air conditioner and the second optical coupling switch circuit 400 of the outdoor unit of the air conditioner.
The specific working principle of the communication circuit 300 is as follows: when the air conditioner is powered on, the first controllable switch 30 is off and the second controllable switch 50 is on by default. In this case, the total resistance value of the communication circuit 300 is approximately equal to the resistance value of the loop resistor module 20, i.e. only the loop resistor module 20 of the communication circuit 300 plays a role of current limiting. Meanwhile, the current collecting circuit 70 collects the current signal flowing through the loop resistor module 20 in real time, converts the collected current signal into a voltage signal, amplifies the voltage signal, and feeds the amplified voltage signal back to the input terminal 101 of the controller 10.
The controller 10 analyzes and judges the voltage signal fed back by the current collecting circuit 70 by calling a program or a module therein to determine whether the loop current in the circuit is normal. Specifically, a first preset current is used as a lower limit value of the current range, a second preset current is used as an upper limit value of the current range, and the first preset current is smaller than the second preset current. The first preset current may be set according to a minimum current required for the turn-on of the photo-couplers in the first photo-coupler switch circuit 200 of the indoor unit and the second photo-coupler switch circuit 400 of the outdoor unit, for example, the minimum current required for the turn-on of the photo-couplers in the first photo-coupler switch circuit 200 of the indoor unit and the second photo-coupler switch circuit 400 of the outdoor unit is used as the first preset current. The second preset current can be set according to the maximum current value that each electronic component in the circuit can bear.
If the loop current in the circuit is greater than the first preset current and less than the second preset current when the first controllable switch 30 is turned off and the second controllable switch 50 is turned on, it indicates that the resistance of the loop resistance module 20 is normal, then the controller 10 controls the first controllable switch 30 to be kept in the off state, the second controllable switch 50 is kept in the on state, and the air conditioner indoor unit and the air conditioner outdoor unit are in normal communication.
If the loop current in the circuit is smaller than the first preset current when the first controllable switch 30 is turned off and the second controllable switch 50 is turned on, it indicates that the loop current is abnormally decreased due to the abnormally increased resistance of the loop resistor module 20 in the communication circuit 300. In this case, the controller 10 controls the first controllable switch 30 to switch from the off state to the on state, and controls the second controllable switch 50 to maintain the on state, so that the first resistance module 40 and the loop resistance module 20 are connected in parallel to the circuit. Since the total resistance value in the communication circuit 300 is decreased after the first resistance module 40 is connected in parallel with the loop resistance module 20, the loop current in the circuit is increased under the condition that the voltage provided by the power supply module 100 of the air conditioner is not changed, and thus, the situation that the loop current is abnormally decreased due to the abnormally increased resistance value of the loop resistance module 20, and further the photoelectric coupler in the indoor unit and the outdoor unit cannot be conducted due to the excessively small loop current can be avoided.
If the loop current in the circuit is greater than the second preset current when the first controllable switch 30 is turned off and the second controllable switch 50 is turned on, it indicates that the resistance value of the loop resistance module 20 in the communication circuit 300 is abnormally decreased, which results in an abnormally increased loop current in the circuit. In this case, the controller 10 controls the first controllable switch 30 to maintain the off state, controls the second controllable switch 50 to switch from the on state to the off state, and controls the second controllable switch 50 to be switched off, so that the second resistance module 60 and the loop resistance module 20 are connected in series to the circuit. Since the total resistance value of the communication circuit 300 is increased after the second resistor module 60 is connected in series with the loop resistor module 20, the loop current in the circuit is decreased under the condition that the voltage provided by the power supply module 100 of the air conditioner is not changed, and thus, the electronic components in the circuit can be prevented from being burned out due to the abnormal increase of the loop current in the circuit caused by the abnormal decrease of the resistance value of the loop resistor module 20.
The technical scheme of the utility model is that the loop current in the circuit is collected by the current collecting circuit 70 and fed back to the controller 10; when the loop current is too small, the controller 10 controls the first controllable switch 30 to be conducted, so that the first resistor module 40 and the loop resistor module 20 are connected in parallel to a circuit, the total resistance value in the circuit is reduced, the loop current is increased, and the normal operation of the photoelectric couplers in the indoor unit and the outdoor unit is ensured; when the loop current is too large, the controller 10 controls the second controllable switch 50 to be switched off, so that the second resistor module 60 and the loop resistor module 20 are connected in series to the circuit, the total resistance value in the circuit is increased, the loop current is reduced, and electronic components in the circuit are prevented from being burnt out due to the too large loop current.
Optionally, referring to fig. 3, in an embodiment, the current collecting circuit 70 includes a sampling circuit 71 and a signal amplifying circuit 72; the input end of the sampling circuit 71 is the input end 701 of the current collecting circuit 70, that is, the input end of the sampling circuit 71 is connected with the output end of the second controllable switch 50; the output end of the sampling circuit 71 is the first output end 702 of the current collecting circuit 70, and the output end of the sampling circuit 71 is connected with the input end of the signal amplifying circuit 72; the output terminal of the signal amplifying circuit 72 is the second output terminal 703 of the current collecting circuit 70.
The sampling circuit 71 is configured to collect a current signal in the circuit, convert the current signal into a voltage signal, and transmit the voltage signal to the signal amplifying circuit 72. The sampling circuit 71 may be implemented by a single resistor, or may be implemented by a plurality of resistors connected in series.
The signal amplifying circuit 72, which may be implemented by an operational amplifying circuit, is configured to amplify the voltage signal of the sampling circuit 71 and feed the amplified voltage signal back to the controller 10, so that the controller 10 can analyze and determine whether the loop current in the circuit is normal according to the received voltage signal, and perform corresponding operations, for example, control the first controllable switch 30 to be turned on or off, and control the second controllable switch 50 to be turned on or off.
Optionally, referring to fig. 4, in one embodiment, the sampling circuit 71 includes a first resistor R1; a first end of the first resistor R1 is an input end of the sampling circuit 71; the second terminal of the first resistor R1 is the output terminal of the sampling circuit 71, and the second terminal of the first resistor R1 is connected to the input terminal of the signal amplifying circuit 72.
In a specific embodiment, the sampling circuit 71 can be implemented by a single resistor to collect the loop current in the circuit, and the sampling circuit 71 is formed by a single resistor, so that the circuit cost can be reduced, and the circuit structure can be simplified. Specifically, when the loop current flows through the first resistor R1, a voltage is formed across the first resistor R1, and the signal amplifying circuit 72 amplifies the voltage across the first resistor R1 and feeds the amplified voltage back to the controller 10, so that the controller 10 can analyze and determine whether the loop current in the circuit is normal according to the received voltage signal, and perform corresponding operations.
Optionally, referring to fig. 4, in an embodiment, the signal amplifying circuit 72 includes a second resistor R2, a third resistor R3, a fourth resistor R4, and an operational amplifier U1;
a first end of the second resistor R2 is an input end of the signal amplifying circuit 72, and a second end of the second resistor R2 is connected to the positive input end of the operational amplifier U1; a negative input terminal of the operational amplifier U1 is connected with a first terminal of the third resistor R3 and a first terminal of the fourth resistor R4; the second end of the third resistor R3 is grounded; the output terminal of the operational amplifier U1 is the output terminal of the signal amplifying circuit 72, and the output terminal of the operational amplifier U1 is connected to the second terminal of the fourth resistor R4.
The third resistor R3 and the fourth resistor R4 are used for determining the amplification factor of the operational amplifier U1 for the voltage signal, and the voltage signal output by the acquisition circuit 701 is amplified by the signal amplification circuit 72 composed of the second resistor R2, the third resistor R3, the fourth resistor R4 and the operational amplifier U1 and then fed back to the controller 10.
Optionally, referring to fig. 4, in an embodiment, the loop resistance module 20 includes a fifth resistor R5; the first terminal of the fifth resistor R5 is the first terminal of the loop resistor module 20, and the second terminal of the fifth resistor R5 is the second terminal of the loop resistor module 20.
Specifically, when the air conditioner is powered on, the first controllable switch 30 is off and the second controllable switch 50 is on by default. In this case, the total resistance of the communication circuit 300 is approximately equal to the resistance of the fifth resistor R5, i.e. only the fifth resistor R5 of the communication circuit 300 plays a role of current limiting.
If the loop current in the circuit is greater than the first preset current and less than the second preset current when the first controllable switch 30 is turned off and the second controllable switch 50 is turned on, which indicates that the resistance of the fifth resistor R5 is normal, then the controller 10 controls the first controllable switch 30 to keep the off state and the second controllable switch 50 to keep the on state.
If the loop current in the circuit is smaller than the first preset current when the first controllable switch 30 is turned off and the second controllable switch 50 is turned on, it indicates that the loop current is abnormally decreased due to the abnormally increased resistance of the fifth resistor R5 in the communication circuit 300. In this case, the controller 10 controls the first controllable switch 30 to switch from the off state to the on state, and controls the second controllable switch 50 to maintain the on state, so that the first resistance module 40 and the fifth resistance R5 are connected in parallel to the circuit. Since the total resistance of the communication circuit 300 is decreased after the first resistor module 40 and the fifth resistor R5 are connected in parallel, the loop current in the circuit is increased under the condition that the voltage provided by the power supply module 100 of the air conditioner is not changed, and thus, the situation that the loop current is abnormally decreased due to the abnormal increase of the resistance of the fifth resistor R5, and further, the photoelectric coupler in the indoor unit and the outdoor unit cannot be conducted due to the excessively small loop current can be avoided.
If the loop current in the circuit is larger than the second preset current when the first controllable switch 30 is turned off and the second controllable switch 50 is turned on, it indicates that the resistance of the fifth resistor R5 in the communication circuit 300 is abnormally reduced, which results in an abnormally increased loop current in the circuit. In this case, the controller 10 controls the first controllable switch 30 to maintain the off state, controls the second controllable switch 50 to switch from the on state to the off state, and controls the second controllable switch 50 to be switched off, so that the second resistance module 60 and the fifth resistor R5 are connected in series to the circuit. Since the total resistance of the communication circuit 300 is increased after the second resistor module 60 and the fifth resistor R5 are connected in series, the loop current in the circuit is decreased under the condition that the voltage provided by the power supply module 100 of the air conditioner is not changed, and thus, the electronic components in the circuit can be prevented from being burned out due to the abnormal increase of the loop current in the circuit caused by the abnormal decrease of the resistance of the fifth resistor R5.
Optionally, referring to fig. 4, in an embodiment, the first resistance module 40 includes a sixth resistance R6; and the first controllable switch 30 is connected in series with the sixth resistor R6 and then connected in parallel with the loop resistance module 20.
The sixth resistor R6 is used to connect the circuit in parallel with the loop resistor module 20 when the first controllable switch 30 is turned on, so as to reduce the total resistance value in the communication circuit 300 and increase the loop current in the circuit, thereby avoiding the problem that the loop current is abnormally reduced due to the abnormal increase of the resistance value of the loop resistor module 20, which further causes the abnormal operation of the photoelectric coupler in the indoor unit of the air conditioner and the outdoor unit of the air conditioner, and affects the normal communication between the indoor unit of the air conditioner and the outdoor unit of the air conditioner.
Optionally, referring to fig. 4, in an embodiment, the second resistance module 60 includes a seventh resistance R7; the seventh resistor R7 is connected in parallel with the second controllable switch 50.
The seventh resistor R7 is used to connect in series with the loop resistor module 20 to the circuit when the second controllable switch 50 is turned off, so as to increase the total resistance value in the communication circuit 300 and reduce the loop current in the circuit, thereby avoiding the abnormal increase of the loop current caused by the abnormal decrease of the resistance value of the loop resistor module 20 and further damaging the electronic components in the circuit.
In order to better explain the inventive concept of the present invention, the inventive concept of the present invention is explained below with reference to fig. 1 and 4.
When the air conditioner is powered on, the first controllable switch Q1 is off and the second controllable switch Q2 is on by default. At this time, the current inputted from the current input terminal IN is conducted to the current output terminal OUT through the fifth resistor R5, the second controllable switch Q2 and the first resistor R1. At this time, the first resistor R1 collects the loop current in the circuit, converts the loop current into voltage, amplifies the voltage by the signal amplifying circuit 72, and feeds the amplified voltage back to the controller 10.
The controller 10 analyzes the received voltage signal by calling an internal program or module thereof to determine the magnitude of the loop current, and if the loop current is greater than the first preset current and less than the second preset current, the controller 10 controls the first controllable switch Q1 to maintain the off state, the second controllable switch Q2 to maintain the on state, and the air conditioner indoor unit and the air conditioner outdoor unit normally communicate with each other.
If the loop current is smaller than the first preset current, the resistance value of the fifth resistor R5 in the circuit is abnormally increased, so that the loop current is abnormally reduced. In this case, the controller 10 controls the first controllable switch 30 to switch from the off state to the on state, and controls the second controllable switch 50 to maintain the on state, so that the fifth resistor R5 and the sixth resistor R6 are connected in parallel to the circuit. Since the total resistance of the communication circuit 300 is approximately equal to the ratio of the product of the resistance of the fifth resistor R5 and the resistance of the sixth resistor R6 to the sum of the resistance of the fifth resistor R5 and the resistance of the sixth resistor R6 after the fifth resistor R5 and the sixth resistor R6 are connected in parallel, that is, the total resistance of the communication circuit 300 is approximately equal to R5R 6/(R5+ R6), the total resistance of the communication circuit 300 is decreased. Under the condition that the voltage provided by the power supply module 100 of the air conditioner is not changed, the total resistance value in the circuit is reduced, and the loop current is increased, so that the situation that the loop current is abnormally reduced due to the abnormal increase of the resistance value of the fifth resistor R5, and further a photoelectric coupler in an indoor unit and an outdoor unit cannot be conducted due to the excessively small loop current can be avoided, and the normal communication between the indoor unit of the air conditioner and the outdoor unit of the air conditioner is ensured.
If the loop current is greater than the second predetermined current, it indicates that the resistance of the fifth resistor R5 in the communication circuit 300 is abnormally decreased, resulting in an abnormally increased loop current. In this case, the controller 10 controls the first controllable switch 30 to maintain the off state, and controls the second controllable switch 50 to switch from the on state to the off state, so that the fifth resistor R5 and the seventh resistor R7 are connected in series to the circuit. Since the fifth resistor R5 and the seventh resistor R7 are connected in series, the total resistance of the communication circuit 300 is approximately equal to the sum of the resistance of the fifth resistor R5 and the resistance of the seventh resistor R7, i.e., the total resistance of the communication circuit 300 is increased. Under the condition that the voltage provided by the power supply module 100 of the air conditioner is not changed, the total resistance value in the communication circuit 300 is increased, and the loop current is reduced, so that electronic components in the circuit can be prevented from being burnt due to abnormal increase of the loop current in the circuit caused by abnormal reduction of the resistance value of the fifth resistor R5.
The utility model also provides an air conditioner, this air conditioner include indoor set, off-premises station and as above communication circuit, this communication circuit's current input end and this indoor set are connected, and this communication circuit's current output end is connected with this off-premises station. Further, the air conditioner further comprises a power supply module 100, the indoor unit comprises a first optical coupling switch circuit 200, and the outdoor unit comprises a second optical coupling switch circuit 400; the positive pole of the power supply module 100 is connected with the input end of a first optical coupling switch circuit 200 on the indoor unit side, and the output end of the first optical coupling switch circuit 200 is connected with the current input end of a communication circuit 300; the input end of the second optical coupling switch circuit 400 on the outdoor unit side is connected to the current output end of the communication circuit 300, and the output end of the second optical coupling switch circuit 400 is connected to the negative electrode of the power supply module 100.
In an embodiment, referring to fig. 2, the first optical coupling switching circuit 200 of the indoor unit side, the first optical coupling switching circuit 200 includes a first optical coupler OP1, a third optical coupler OP3, and a first switching tube T1.
A collector of the third photoelectric coupler OP3 is connected to a power supply VCC, and an emitter of the third photoelectric coupler OP3 is connected to a signal receiving terminal RXD1 of the indoor unit; the positive electrode of the light emitting diode of the third photocoupler OP3 is connected with the positive electrode of the power module 100 of the air conditioner, and the negative electrode of the light emitting diode of the third photocoupler OP3 is connected with the collector of the first photocoupler OP 1; the emitter of the first photocoupler OP1 is connected with the current input end of the communication circuit 300; the anode of the light emitting diode of the first photocoupler OP1 is connected with a power supply VCC, and the cathode of the light emitting diode of the first photocoupler OP1 is connected with the input end of the first switch tube T1; the output terminal of the first switch tube T1 is grounded, and the controlled terminal of the first switch tube T1 is connected to the signal transmitting terminal TXD1 of the indoor unit.
The second photo coupler switch circuit 400 of the outdoor unit side includes a second photo coupler OP2, a fourth photo coupler OP4, and a second switch tube T2.
A collector of the fourth photoelectric coupler OP4 is connected to a power VCC, and an emitter of the fourth photoelectric coupler OP4 is connected to a signal receiving terminal RXD2 of the outdoor unit; the negative electrode of the light emitting diode of the fourth photocoupler OP4 is connected with the negative electrode of the power module 100 of the air conditioner, and the positive electrode of the light emitting diode of the fourth photocoupler OP4 is connected with the emitter of the second photocoupler OP 2; the collector of the second photocoupler OP2 is connected with the current output end of the communication circuit 300; the anode of the light emitting diode of the second photocoupler OP2 is connected with a power supply VCC; the cathode of the light emitting diode of the second photocoupler OP2 is connected with the input end of a second switch tube T2; the output terminal of the second switch tube T2 is grounded, and the controlled terminal of the second switch tube T2 is connected to the signal transmitting terminal TXD2 of the outdoor unit of the air conditioner.
And the communication circuit 300 is used for realizing the communication connection between the first optical coupling switch circuit 200 of the air conditioner indoor unit and the second optical coupling switch circuit 400 of the air conditioner outdoor unit. The detailed structure of the communication circuit can refer to the above embodiments, and is not described herein; it can be understood that, because the utility model discloses an above-mentioned communication circuit has been used in the air conditioner, consequently, the utility model discloses an embodiment of air conditioner includes all technical scheme of the whole embodiments of above-mentioned communication circuit, and the technical effect who reaches is also identical, no longer gives unnecessary details here.
The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (10)
1. A communication circuit is characterized by comprising a current input end connected with an air conditioner indoor unit, a current output end connected with the air conditioner outdoor unit, a loop resistance module, a controller, a first controllable switch, a second controllable switch, a first resistance module, a second resistance module and a current acquisition circuit;
the first end of the loop resistance module is connected with the current input end, and the second end of the loop resistance module is connected with the input end of the second controllable switch;
the output end of the second controllable switch is connected with the input end of the current acquisition circuit, the first output end of the current acquisition circuit is connected with the current output end, and the second output end of the current acquisition circuit is connected with the input end of the controller;
the first controllable switch is connected with the first resistance module in series and then connected with the loop resistance module in parallel, and the second resistance module is connected with the second controllable switch in parallel;
and a first output end of the controller is connected with a controlled end of the first controllable switch, and a second output end of the controller is connected with a controlled end of the second controllable switch.
2. The communication circuit of claim 1, wherein the current collection circuit comprises a sampling circuit and a signal amplification circuit;
the input end of the sampling circuit is the input end of the current acquisition circuit; the output end of the sampling circuit is a first output end of the current acquisition circuit, and the output end of the sampling circuit is connected with the input end of the signal amplification circuit; the output end of the signal amplification circuit is the second output end of the current acquisition circuit.
3. The communication circuit of claim 2, wherein the sampling circuit comprises a first resistor; the first end of the first resistor is the input end of the sampling circuit; the second end of the first resistor is the output end of the sampling circuit, and the second end of the first resistor is connected with the input end of the signal amplification circuit.
4. The communication circuit of claim 3, wherein the signal amplification circuit comprises a second resistor, a third resistor, a fourth resistor, and an operational amplifier;
a first end of the second resistor is an input end of the signal amplification circuit, and a second end of the second resistor is connected with a positive input end of the operational amplifier; the negative input end of the operational amplifier is connected with the first end of the third resistor and the first end of the fourth resistor; the second end of the third resistor is grounded; the output end of the operational amplifier is the output end of the signal amplification circuit, and the output end of the operational amplifier is connected with the second end of the fourth resistor.
5. The communication circuit of claim 1, wherein the loop resistance module comprises a fifth resistor;
the first end of the fifth resistor is the first end of the loop resistor module, and the second end of the fifth resistor is the second end of the loop resistor module.
6. The communication circuit of claim 1, wherein the first resistor module comprises a sixth resistor;
and the first controllable switch is connected with the sixth resistor in series and then connected with the loop resistor module in parallel.
7. The communication circuit of claim 1, wherein the second resistor module comprises a seventh resistor;
the seventh resistor is connected in parallel with the second controllable switch.
8. The communication circuit of claim 1, wherein the first controllable switch is an NPN transistor or a PNP transistor; the second controllable switch is an NPN triode or a PNP triode.
9. An air conditioner, characterized in that, the air conditioner includes an indoor unit, an outdoor unit and the communication circuit of any one of claims 1-8, the indoor unit is connected with the current input end of the communication circuit, and the outdoor unit is connected with the current output end of the communication circuit.
10. The air conditioner of claim 9, further comprising a power supply module, wherein the indoor unit comprises a first optical coupling switch circuit, and wherein the outdoor unit comprises a second optical coupling switch circuit;
the anode of the power supply module is connected with the input end of the first optical coupling switch circuit, and the output end of the first optical coupling switch circuit is connected with the current input end of the communication circuit;
the input end of the second optical coupling switch circuit is connected with the current output end of the communication circuit, and the output end of the second optical coupling switch circuit is connected with the negative electrode of the power supply module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021397351.8U CN212692077U (en) | 2020-07-15 | 2020-07-15 | Communication circuit and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021397351.8U CN212692077U (en) | 2020-07-15 | 2020-07-15 | Communication circuit and air conditioner |
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| CN212692077U true CN212692077U (en) | 2021-03-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114791157A (en) * | 2022-04-15 | 2022-07-26 | 珠海格力电器股份有限公司 | Communication device of air conditioner outdoor unit and communication system of air conditioner |
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2020
- 2020-07-15 CN CN202021397351.8U patent/CN212692077U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114791157A (en) * | 2022-04-15 | 2022-07-26 | 珠海格力电器股份有限公司 | Communication device of air conditioner outdoor unit and communication system of air conditioner |
| CN114791157B (en) * | 2022-04-15 | 2023-09-26 | 珠海格力电器股份有限公司 | Communication device of air conditioner external unit and communication system of air conditioner |
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