CN218379838U - Current loop communication circuit and air conditioner - Google Patents
Current loop communication circuit and air conditioner Download PDFInfo
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- CN218379838U CN218379838U CN202221644723.1U CN202221644723U CN218379838U CN 218379838 U CN218379838 U CN 218379838U CN 202221644723 U CN202221644723 U CN 202221644723U CN 218379838 U CN218379838 U CN 218379838U
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Abstract
The utility model relates to an electric current loop communication circuit and air conditioner, include: the power supply comprises a power supply input end, a voltage stabilizing unit, a first control unit, a second control unit, a first optical coupler unit, a second optical coupler unit, a third optical coupler unit and a fourth optical coupler unit; the control end of the first optical coupling unit is connected with the signal output end of the first control unit, a first receiving end of the first optical coupling unit and a second receiving end of the fourth optical coupling unit are connected with the voltage stabilizing unit, and the second receiving end of the first optical coupling unit is connected with the first control end of the second optical coupling unit; the receiving end of the second optical coupling unit is connected with the signal input end of the first control unit, and the second control end of the second optical coupling unit is connected with the first control end of the third optical coupling unit; the receiving end of the third optical coupling unit is connected with the signal input end of the second control unit, and the second control end of the third optical coupling unit is connected with the first receiving end of the fourth optical coupling unit; and the control end of the fourth optical coupling unit is connected with the signal output end of the second control unit. Implement the utility model discloses can realize current loop communication circuit's wide voltage power supply.
Description
Technical Field
The utility model relates to the field of communication technology, more specifically say, relate to a current loop communication circuit and air conditioner.
Background
The supply voltages may vary from country to country and from region to region. Electronic devices are used in different countries and regions, taking into account the range of voltages they can withstand. The power supply of the current loop communication circuit is usually resistance voltage reduction and voltage stabilization of a voltage stabilizing tube to 24V, when the current loop communication circuit is applied to wide voltage input, the voltage cannot be stabilized to 24V under the working condition of low voltage, so that communication faults are caused, and under the working condition of high voltage, the voltage reducing resistance generates heat seriously, so that the service life and the reliability are reduced.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, a current loop communication circuit and air conditioner are provided.
The utility model provides a technical scheme that its technical problem adopted is: constructing a current loop communication circuit comprising: the device comprises a power input end, a voltage stabilizing unit, a first control unit, a second control unit, a first optical coupling unit, a second optical coupling unit, a third optical coupling unit and a fourth optical coupling unit;
the voltage stabilizing unit is connected with the power supply input end and used for outputting a stable voltage;
the control end of the first optical coupling unit is connected with the signal output end of the first control unit, the first receiving end of the first optical coupling unit is connected with the voltage stabilizing unit, and the second receiving end of the first optical coupling unit is connected with the first control end of the second optical coupling unit;
the receiving end of the second optical coupling unit is connected with the signal input end of the first control unit, and the second control end of the second optical coupling unit is connected with the first control end of the third optical coupling unit;
the receiving end of the third optical coupling unit is connected with the signal input end of the second control unit, and the second control end of the third optical coupling unit is connected with the first receiving end of the fourth optical coupling unit;
the control end of the fourth optical coupling unit is connected with the signal output end of the second control unit, and the second receiving end of the fourth optical coupling unit is connected with the voltage stabilizing unit.
Preferably, in the current loop communication circuit of the present invention, the voltage stabilizing unit includes a transistor Q1, a transistor Q2, a resistor R1, a resistor R2, a resistor R3, and a charging capacitor E1;
a collector of the triode Q1 is connected with the first end of the resistor R1 and a live wire input end of the power input end, a base of the triode Q1 is connected with the second end of the resistor R1 and a collector of the triode Q2, and an emitter of the triode Q1 is connected with the first end of the resistor R2, the first end of the charging capacitor E1 and a first receiving end of the first optocoupler unit;
the base electrode of the triode Q2 is connected with the second end of the resistor R2 and the first end of the resistor R3, and the emitting electrode of the triode Q2 is connected with the second end of the charging capacitor E1, the second end of the resistor R3, the zero line input end of the power input end and the second receiving end of the fourth optical coupling unit.
Preferably, in the current loop communication circuit of the present invention, the first optical coupler unit includes a transistor Q4, a resistor R4, and an optical coupler IC1;
a power supply voltage is input to the anode of a light emitting tube of the optical coupler IC1, the cathode of the light emitting tube of the optical coupler IC1 is connected with the first end of the resistor R4, the first end of a photosensitive tube of the optical coupler IC1 is connected with the emitting electrode of the triode Q1, and the second end of the photosensitive tube of the optical coupler IC1 is connected with the first control end of the second optical coupler unit;
the second end of the resistor R4 is connected with the collector of the triode Q4, the base of the triode Q4 is connected with the signal output end of the first control unit, and the emitter of the triode Q4 is grounded.
Preferably, in the current loop communication circuit of the present invention, the fourth optical coupler unit includes a transistor Q3, a resistor R5, and an optical coupler IC2;
the anode of the light emitting tube of the optical coupler IC2 is used for inputting a power supply voltage, the cathode of the light emitting tube of the optical coupler IC2 is connected with the first end of the resistor R5, the first end of the photosensitive tube of the optical coupler IC2 is connected with the second control end of the third optical coupler unit, and the second end of the photosensitive tube of the optical coupler IC2 is connected with the zero line input end of the power supply input end;
the second end of the resistor R5 is connected with the collector of the triode Q3, the base of the triode Q3 is connected with the signal output end of the second control unit, and the third end of the triode Q3 is grounded.
Preferably, in the current loop communication circuit of the present invention, the second optical coupling unit includes an optical coupling IC3, a resistor R11, a resistor R12, a resistor R8, and a capacitor C7;
the positive pole of opto-coupler IC 3's luminotron is connected the second receiving terminal of first opto-coupler unit the first end of resistance R8 with the first end of electric capacity C7, the negative pole of opto-coupler IC 3's luminotron is connected the first control end of third opto-coupler unit the second end of resistance R8 with the second end of electric capacity C7, a mains voltage is connected to the first end of opto-coupler IC 3's photosensitive tube, the second end of opto-coupler IC 3's photosensitive tube is connected the first end of resistance R11 with the first end of resistance R12, the second end of resistance R11 is connected the signal input part of first control unit, the second end ground connection of resistance R12.
Preferably, in the current loop communication circuit of the present invention, the second optical coupling unit further includes a diode D2, an anode of the diode D2 is connected to the second end of the light emitting tube of the optical coupling IC3, and a cathode of the diode D2 is connected to the first control end of the third optical coupling unit.
Preferably, in the current loop communication circuit of the present invention, the third optical coupling unit includes an optical coupling IC4, a resistor R10, a resistor R9, and a capacitor C8;
the positive pole of opto-coupler IC 4's luminotron is connected the second control end of third opto-coupler unit the first end of resistance R9 with electric capacity C8's first end, the negative pole of opto-coupler IC 4's luminotron is connected the first receiving terminal of fourth opto-coupler unit the second end of resistance R9 with electric capacity C8's second end, a mains voltage is connected to the first end of opto-coupler IC 4's photosensitive tube, the second end of opto-coupler IC 4's photosensitive tube is connected the first end of resistance R10, the second end of resistance R10 is connected the signal input part of second control unit.
Preferably, the utility model discloses an among the current loop communication circuit, the third opto-coupler unit still includes diode D1, diode D1's positive pole is connected the second control end of second opto-coupler unit, diode D1's negative pole is connected the first end of opto-coupler IC 4's luminotron.
Preferably, the current loop communication circuit of the present invention further comprises a current adjusting unit connected to the second control end of the second optical coupling unit and the first control end of the third optical coupling unit; the current adjusting unit is used for adjusting the output current of the second control end of the second optical coupling unit.
Preferably, in the current loop communication circuit of the present invention, the current adjusting unit includes a resistor R13 and a linear optocoupler IC5;
the first end of linear opto-coupler IC5 is connected first the control unit, the second end ground connection of linear opto-coupler IC5, the third end of linear opto-coupler IC5 is connected the first end of resistance R13 with the first control end of third opto-coupler unit, the fourth end of linear opto-coupler IC5 is connected the second end of resistance R13 with the second control end of second opto-coupler unit.
The utility model discloses still construct an air conditioner, include as above arbitrary the electric current loop communication circuit, wherein, first the control unit set up in the indoor set of air conditioner, the second the control unit set up in the off-premises station of air conditioner.
Implement the utility model discloses an electric current loop communication circuit and air conditioner has following beneficial effect: wide voltage supply of the current loop communication circuit can be realized.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of an embodiment of a current loop communication circuit according to the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the current loop communication circuit of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, the embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, in an embodiment of the present invention, a current loop communication circuit includes: the power supply comprises a power supply input end 110, a voltage stabilizing unit 120, a first control unit 131, a second control unit 132, a first optical coupling unit 141, a second optical coupling unit 142, a third optical coupling unit 143 and a fourth optical coupling unit 144; the voltage stabilizing unit 120 is connected to the power input terminal 110 and configured to output a stable voltage; a control end of the first optical coupler unit 141 is connected to a signal output end of the first control unit 131, a first receiving end of the first optical coupler unit 141 is connected to the voltage stabilizing unit 120, and a second receiving end of the first optical coupler unit 141 is connected to a first control end of the second optical coupler unit 142; a receiving end of the second optical coupler unit 142 is connected to a signal input end of the first control unit 131, and a second control end of the second optical coupler unit 142 is connected to a first control end of the third optical coupler unit 143; a receiving end of the third optical coupling unit 143 is connected to a signal input end of the second control unit 132, and a second control end of the third optical coupling unit 143 is connected to a first receiving end of the fourth optical coupling unit 144; a control end of the fourth optical coupling unit 144 is connected to the signal output end of the second control unit 132, and a second receiving end of the fourth optical coupling unit 144 is connected to the voltage stabilizing unit 120. Specifically, the power input of the power input terminal 110 is stabilized by the voltage stabilizing unit 120 to output a stabilized voltage. A signal output end of the first control unit 131 outputs a control level to enable the first optical coupler unit 141 to be in an on or off state, and a signal output end of the second control unit 132 outputs a control level to enable the fourth optical coupler unit 144 to be in an on or off state. The second and third light coupling units 142 and 143 are turned on or off correspondingly according to the turning on or off of the first and fourth light coupling units 141 and 144. When the signal output end of the first control unit 131 outputs a corresponding level to turn on the first optical coupler unit 141, and the second control unit 132 controls the fourth optical coupler unit 144 to turn on, at this time, the second optical coupler unit 142 and the third optical coupler unit 143 are turned on, and the signal receiving end of the second control unit 132 generates a corresponding level. When the signal output end of the first control unit 131 outputs the corresponding level to turn on the second optical coupler unit 142, the second control unit 132 controls the fourth optical coupler unit 144 to turn on, the second optical coupler unit 142 and the third optical coupler unit 143 are turned off, and the signal receiving end of the corresponding second control unit 132 receives another level, so that the communication signal is finally transmitted from the first control unit 131 to the second control unit 132. Likewise, the transmission of the communication signal from the second control unit 132 to the first control unit 131 may also be implemented. It is understood that the second optical coupling unit 142 and the third optical coupling unit 143 are connected by a signal line.
Optionally, as shown in fig. 2, the voltage stabilizing unit 120 includes a transistor Q1, a transistor Q2, a resistor R1, a resistor R2, a resistor R3, and a charging capacitor E1; a collector of the triode Q1 is connected with the first end of the resistor R1 and the live wire input end of the power input end 110, a base of the triode Q1 is connected with the second end of the resistor R1 and a collector of the triode Q2, and an emitter of the triode Q1 is connected with the first end of the resistor R2, the first end of the charging capacitor E1 and the first receiving end of the first optocoupler unit 141; a base electrode of the triode Q2 is connected to the second end of the resistor R2 and the first end of the resistor R3, and an emitter electrode of the triode Q2 is connected to the second end of the charging capacitor E1, the second end of the resistor R3, the zero line input end of the power input end 110, and the second receiving end of the fourth optical coupling unit 144. Specifically, the resistor R2, the resistor R3, and the transistor Q2 are used as negative feedback, the resistor R2 and the resistor R3 divide voltage to generate a target voltage, and the voltage Vf of the base of the transistor to the emitter is generally about 0.7V, so that the single jade ring Vout = Vf (R2 + R3)/R3 of the text segment can be calculated, and the transistor Q1 is turned on to charge the capacitor E1 only when the positive half wave of the alternating current is generated and the input voltage is greater than the output voltage. When the emitter input Vin of the triode Q1 is greater than the emitter output Vout of the triode Q1, the BE current Ib1 of the triode Q1 is gradually increased, the CE current Ic1= beta Ib1 of the triode Q1, beta is the current gain of the triode, the capacitor is charged, when the Vout is higher than a preset value, the BE current Ib2 of the triode Q2 is gradually increased, the CE current Ic2= beta Ib2 of the triode Q1 is gradually increased, and the Ic2 is also gradually increased, then Ib1 is decreased, and Ic1 is also decreased, so that negative feedback is formed, and the voltage is stabilized near the preset value. Through the circuit, a stable power supply can be provided under the condition of wide voltage input, the heat generation is less than that of a pure voltage reduction and voltage stabilization circuit, the output voltage fluctuation is small when low voltage is input, the heat generation is less when high voltage is input, and the communication circuit is more stable and reliable.
Optionally, the first optical coupler unit 141 includes a transistor Q4, a resistor R4, and an optical coupler IC1; the anode of the light-emitting tube of the optocoupler IC1 inputs a power supply voltage, the cathode of the light-emitting tube of the optocoupler IC1 is connected with the first end of the resistor R4, the first end of the photosensitive tube of the optocoupler IC1 is connected with the emitting electrode of the triode Q1, and the second end of the photosensitive tube of the optocoupler IC1 is connected with the first control end of the second optocoupler unit 142; the second end of the resistor R4 is connected to the collector of the transistor Q4, the base of the transistor Q4 is connected to the signal output terminal of the first control unit 131, and the emitter of the transistor Q4 is grounded. Specifically, in the first optical coupler unit 141, a signal output end of the first control unit 131 outputs a signal to drive the transistor Q4 to be turned on or off. When the triode Q4 is conducted, the optocoupler IC1 is conducted. When the triode Q4 is turned off, the optocoupler IC1 is turned off.
Optionally, the fourth optical coupler unit 144 includes a transistor Q3, a resistor R5, and an optical coupler IC2; the anode of the light emitting tube of the optical coupler IC2 is used for inputting a power supply voltage, the cathode of the light emitting tube of the optical coupler IC2 is connected with the first end of the resistor R5, the first end of the photosensitive tube of the optical coupler IC2 is connected with the second control end of the third optical coupler unit 143, and the second end of the photosensitive tube of the optical coupler IC2 is connected with the zero line input end of the power supply input end 110; the second end of the resistor R5 is connected to the collector of the transistor Q3, the base of the transistor Q3 is connected to the signal output end of the second control unit 132, and the third end of the transistor Q3 is grounded. Specifically, in the fourth optical coupler unit 144, a signal output end of the second control unit 132 outputs a signal to drive the transistor Q3 to be turned on or turned off. When the triode Q3 is conducted, the optocoupler IC2 is conducted. When the triode Q3 is turned off, the optocoupler IC2 is turned off.
Optionally, the second optical coupler unit 142 includes an optical coupler IC3, a resistor R11, a resistor R12, a resistor R8, and a capacitor C7; the second receiving terminal of first opto-coupler unit 141 is connected to the positive pole of the luminotron of opto-coupler IC3, the first end of resistance R8 and the first end of electric capacity C7, the first control end of third opto-coupler unit 143 is connected to the negative pole of the luminotron of opto-coupler IC3, the second end of resistance R8 and the second end of electric capacity C7, a mains voltage is connected to the first end of opto-coupler IC 3's photosensitive tube, the first end of second end connecting resistance R11 and the first end of resistance R12 of opto-coupler IC 3's photosensitive tube, the signal input part of first control unit 131 is connected to resistance R11's second end, resistance R12's second end ground connection. Specifically, in the second optical coupler unit 142, the optical coupler IC3 is turned on when the first optical coupler unit 141 and the fourth optical coupler unit 144 are turned on, a signal receiving end of the first control unit 131 receives a high level when the optical coupler IC3 is turned on, and is pulled down by the resistor R12 to receive a low level when the optical coupler IC3 is turned off.
Optionally, the second optical coupler unit 142 further includes a diode D2, an anode of the diode D2 is connected to the second end of the light emitting tube of the optical coupler IC3, and a cathode of the diode D2 is connected to the first control end of the third optical coupler unit 143. Specifically, the second optical coupling unit 142 is further provided with a diode D2 for forward conduction and reverse isolation.
Optionally, the third optical coupler unit 143 includes an optical coupler IC4, a resistor R10, a resistor R9, and a capacitor C8; the second control end of third opto-coupler unit 143 is connected to the positive pole of the luminotron of opto-coupler IC4, the first end of resistance R9 and the first end of electric capacity C8, the first receiving terminal of fourth opto-coupler unit 144 is connected to the negative pole of the luminotron of opto-coupler IC4, the second end of resistance R9 and the second end of electric capacity C8, a mains voltage is connected to the first end of the photosensitive tube of opto-coupler IC4, the first end of second end connecting resistance R10 of the photosensitive tube of opto-coupler IC4, the signal input part of second control unit 132 is connected to the second end of resistance R10. Specifically, in the third optical coupler unit 143, the optical coupler IC4 is turned on when the first optical coupler unit 141 and the fourth optical coupler unit 144 are turned on, and a signal receiving end of the second control unit 132 receives a high level when the optical coupler IC4 is turned on, and is pulled down by the resistor R12 to receive a low level when the optical coupler IC4 is turned off. When the indoor unit is used as a host, the outdoor unit controls the IC2 to be conducted when the indoor unit sends data, current flows from the positive electrode of the electrolytic capacitor E1 through the ICs 1, 3, 5, R13, IC4 and IC2 to return to the negative electrode of the electrolytic capacitor, the current flows through the IC4, the IC4 is conducted, high level is supplied to the outdoor unit, and the low level is achieved when no current exists.
Optionally, the third optical coupler unit 143 further includes a diode D1, an anode of the diode D1 is connected to the second control end of the second optical coupler unit 142, and a cathode of the diode D1 is connected to the first end of the light emitting tube of the optical coupler IC 4. Specifically, a diode D1 is further disposed in the third optical coupling unit 143 for forward conduction and reverse isolation.
The current loop communication circuit of the present invention further comprises a current adjusting unit connected to the second control end of the second optical coupling unit 142 and the first control end of the third optical coupling unit 143; the current adjusting unit is configured to adjust an output current of the second control terminal of the second optical coupling unit 142. Specifically, a current adjusting unit may be further disposed on a signal line between the second optical coupling unit 142 and the third optical coupling unit 143 through the current adjusting unit for adjusting a transmitted current, which may increase the current to increase the length of the signal line.
Optionally, the current adjusting unit includes a resistor R13 and a linear optocoupler IC5; the first end of the linear optocoupler IC5 is connected with the first control unit 131, the second end of the linear optocoupler IC5 is grounded, the third end of the linear optocoupler IC5 is connected with the first end of the resistor R13 and the first control end of the third optocoupler unit 143, and the fourth end of the linear optocoupler IC5 is connected with the second end of the resistor R13 and the second control end of the second optocoupler unit 142. Specifically, the resistance value of the signal line can be adjusted by adjusting the resistance of the linear optocoupler IC5, and finally the current of the signal line is adjusted.
In addition, the present invention provides an air conditioner, comprising the current loop communication circuit as described above, wherein the first control unit 131 is disposed in an indoor unit of the air conditioner, and the second control unit 132 is disposed in an outdoor unit of the air conditioner. Specifically, a first control unit 131 may be disposed in an indoor unit of the air conditioner, a second control unit 132 may be disposed in an outdoor unit of the air conditioner, and a communication process between the indoor unit of the air conditioner and the outdoor unit of the air conditioner may be implemented through communication between the first control unit 131 and the second control unit 132.
It should be understood that the above examples only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but should not be construed as limiting the scope of the present invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (11)
1. A current loop communication circuit, comprising: the device comprises a power input end, a voltage stabilizing unit, a first control unit, a second control unit, a first optical coupler unit, a second optical coupler unit, a third optical coupler unit and a fourth optical coupler unit;
the voltage stabilizing unit is connected with the power supply input end and used for outputting a stable voltage;
the control end of the first optical coupling unit is connected with the signal output end of the first control unit, the first receiving end of the first optical coupling unit is connected with the voltage stabilizing unit, and the second receiving end of the first optical coupling unit is connected with the first control end of the second optical coupling unit;
the receiving end of the second optical coupling unit is connected with the signal input end of the first control unit, and the second control end of the second optical coupling unit is connected with the first control end of the third optical coupling unit;
the receiving end of the third optical coupling unit is connected with the signal input end of the second control unit, and the second control end of the third optical coupling unit is connected with the first receiving end of the fourth optical coupling unit;
the control end of the fourth optical coupling unit is connected with the signal output end of the second control unit, and the second receiving end of the fourth optical coupling unit is connected with the voltage stabilizing unit.
2. A current loop communication circuit according to claim 1, wherein the voltage regulation unit comprises a transistor Q1, a transistor Q2, a resistor R1, a resistor R2, a resistor R3 and a charging capacitor E1;
a collector of the triode Q1 is connected with the first end of the resistor R1 and a live wire input end of the power input end, a base of the triode Q1 is connected with the second end of the resistor R1 and a collector of the triode Q2, and an emitter of the triode Q1 is connected with the first end of the resistor R2, the first end of the charging capacitor E1 and a first receiving end of the first optocoupler unit;
the base electrode of the triode Q2 is connected with the second end of the resistor R2 and the first end of the resistor R3, and the emitting electrode of the triode Q2 is connected with the second end of the charging capacitor E1, the second end of the resistor R3, the zero line input end of the power input end and the second receiving end of the fourth optical coupling unit.
3. A current loop communication circuit according to claim 2, wherein the first optocoupler unit comprises a transistor Q4, a resistor R4 and an optocoupler IC1;
a power supply voltage is input to the anode of a light emitting tube of the optical coupler IC1, the cathode of the light emitting tube of the optical coupler IC1 is connected with the first end of the resistor R4, the first end of a photosensitive tube of the optical coupler IC1 is connected with the emitting electrode of the triode Q1, and the second end of the photosensitive tube of the optical coupler IC1 is connected with the first control end of the second optical coupler unit;
the second end of the resistor R4 is connected with the collector of the triode Q4, the base of the triode Q4 is connected with the signal output end of the first control unit, and the emitting electrode of the triode Q4 is grounded.
4. A current loop communication circuit according to claim 2, wherein the fourth optocoupler unit comprises a transistor Q3, a resistor R5 and an optocoupler IC2;
the anode of a light emitting tube of the optical coupler IC2 is used for inputting a power supply voltage, the cathode of the light emitting tube of the optical coupler IC2 is connected with the first end of the resistor R5, the first end of a photosensitive tube of the optical coupler IC2 is connected with the second control end of the third optical coupler unit, and the second end of the photosensitive tube of the optical coupler IC2 is connected with the zero line input end of the power supply input end;
the second end of the resistor R5 is connected with the collector of the triode Q3, the base of the triode Q3 is connected with the signal output end of the second control unit, and the third end of the triode Q3 is grounded.
5. A current loop communication circuit according to claim 1, wherein the second optical coupler unit comprises an optical coupler IC3, a resistor R11, a resistor R12, a resistor R8 and a capacitor C7;
the positive pole of opto-coupler IC 3's luminotron is connected the second receiving terminal of first opto-coupler unit the first end of resistance R8 with the first end of electric capacity C7, the negative pole of opto-coupler IC 3's luminotron is connected the first control end of third opto-coupler unit the second end of resistance R8 with the second end of electric capacity C7, a mains voltage is connected to the first end of opto-coupler IC 3's photosensitive tube, the second end of opto-coupler IC 3's photosensitive tube is connected the first end of resistance R11 with the first end of resistance R12, the second end of resistance R11 is connected the signal input part of first control unit, the second end ground connection of resistance R12.
6. A current loop communication circuit according to claim 5, wherein the second optocoupler unit further comprises a diode D2, an anode of the diode D2 is connected to the second end of the light emitting tube of the optocoupler IC3, and a cathode of the diode D2 is connected to the first control end of the third optocoupler unit.
7. A current loop communication circuit according to claim 1, wherein the third optical coupler unit comprises an optical coupler IC4, a resistor R10, a resistor R9 and a capacitor C8;
the positive pole of the luminotron of opto-coupler IC4 is connected the second control end of third opto-coupler unit the first end of resistance R9 with the first end of electric capacity C8, the negative pole of the luminotron of opto-coupler IC4 is connected the first receiving terminal of fourth opto-coupler unit the second end of resistance R9 with the second end of electric capacity C8, a mains voltage is connected to the first end of the photosensitive tube of opto-coupler IC4, the second end of the photosensitive tube of opto-coupler IC4 is connected the first end of resistance R10, the second end of resistance R10 is connected the signal input part of second control unit.
8. A current loop communication circuit according to claim 7, wherein the third optocoupler unit further comprises a diode D1, an anode of the diode D1 is connected to the second control terminal of the second optocoupler unit, and a cathode of the diode D1 is connected to the first terminal of the light emitting tube of the optocoupler IC 4.
9. A current loop communication circuit according to claim 1, further comprising a current regulation unit connected to the second control terminal of the second optical coupler unit and the first control terminal of the third optical coupler unit; the current adjusting unit is used for adjusting the output current of the second control end of the second optical coupler unit.
10. A current loop communication circuit according to claim 9, wherein the current regulation unit comprises a resistor R13 and a linear optocoupler IC5;
the first end of linear opto-coupler IC5 is connected first the control unit, the second end ground connection of linear opto-coupler IC5, the third end of linear opto-coupler IC5 is connected the first end of resistance R13 with the first control end of third opto-coupler unit, the fourth end of linear opto-coupler IC5 is connected the second end of resistance R13 with the second control end of second opto-coupler unit.
11. An air conditioner comprising the current loop communication circuit according to any one of claims 1 to 10, wherein the first control unit is disposed in an indoor unit of the air conditioner, and the second control unit is disposed in an outdoor unit of the air conditioner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221644723.1U CN218379838U (en) | 2022-06-29 | 2022-06-29 | Current loop communication circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221644723.1U CN218379838U (en) | 2022-06-29 | 2022-06-29 | Current loop communication circuit and air conditioner |
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| Publication Number | Publication Date |
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| CN218379838U true CN218379838U (en) | 2023-01-24 |
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| CN202221644723.1U Active CN218379838U (en) | 2022-06-29 | 2022-06-29 | Current loop communication circuit and air conditioner |
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- 2022-06-29 CN CN202221644723.1U patent/CN218379838U/en active Active
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