CN211953182U - Current loop communication circuit - Google Patents
Current loop communication circuit Download PDFInfo
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- CN211953182U CN211953182U CN201921994932.7U CN201921994932U CN211953182U CN 211953182 U CN211953182 U CN 211953182U CN 201921994932 U CN201921994932 U CN 201921994932U CN 211953182 U CN211953182 U CN 211953182U
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Abstract
The utility model discloses a current loop communication circuit, which comprises a switching module, a power module, a detection module, a working module and a current loop communication module, wherein the current loop communication module is used for transmitting communication signals between the detection module and the working module, and the power module is used for providing working current for the current loop communication module; the detection module is used for detecting the working current of the current loop communication module, and when the working current is smaller than a preset current value, a detection signal is output to the working module, the working module controls the working state of the switching module according to the detection signal, the switching module is used for adjusting the power supply current of the power supply module, and stable communication between the indoor unit and the outdoor unit can be effectively realized under the condition that the air conditioner is at normal voltage or low voltage.
Description
Technical Field
The utility model relates to an air conditioning equipment technical field, in particular to electric current loop communication circuit.
Background
The current loop communication circuit has the advantages of convenience in installation and low cost, and is widely applied to communication between the indoor unit and the outdoor unit of the variable frequency air conditioner at present. Under normal conditions, the communication logic of the internal and external machines of the variable frequency air conditioner is that after power is input, alternating current high voltage is converted into direct current low voltage through voltage division, rectification and voltage stabilization and then is output to an isolation optocoupler, and then the isolation optocoupler and the internal and external machines form a current loop communication circuit.
However, the existing current communication circuit has the defects that when the voltage of an input power supply is lower, the current in the current ring is too small, and at the moment, the isolation optocoupler cannot be effectively saturated and conducted, so that communication data of an internal machine and an external machine are distorted, and the air conditioner is abnormally shut down.
Thus, the prior art has yet to be improved and enhanced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an electric current loop communication circuit can effectively realize the air conditioner under the condition of normal voltage or low-voltage, can both stable communication between the indoor set of air conditioner and the off-premises station.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a current loop communication circuit comprises a switching module, a power module, a detection module, a working module and a current loop communication module, wherein the switching module is connected with the power module, the power module is also connected with the current loop communication module, and the current loop communication module is also respectively connected with the detection module and the working module; the current loop communication module is used for transmitting a communication signal between the detection module and the working module, and the power supply module is used for providing working current for the current loop communication module; the detection module is used for detecting the working current of the current loop communication module, and when the working current is smaller than a preset current value, a detection signal is output to the working module, the working module controls the working state of the switching module according to the detection signal, and the switching module is used for adjusting the power supply current of the power supply module.
In the current loop communication circuit, the power module comprises a voltage sampling unit, a rectification voltage-stabilizing unit and a filtering unit, the voltage sampling unit is used for sampling and dividing voltage of a power supply and then outputting the voltage to the rectification voltage-stabilizing unit, the rectification voltage-stabilizing unit is used for rectifying the power supply and then outputting direct current to the filtering unit, and the filtering unit is used for filtering the direct current and then outputting the direct current to the current loop module.
In the current loop communication circuit, the switching module is specifically configured to adjust a voltage division value of the voltage sampling unit, and further adjust the working current.
In the current loop communication circuit, the current loop communication module includes a first communication unit, a second communication unit and a current loop unit, and the first communication unit is used for outputting a first communication signal output by the detection module to the second communication unit and receiving a second communication signal output by the second communication unit; the second communication unit is used for outputting a second communication signal output by the working module to the first communication unit and receiving the first communication signal, and the current loop unit is used for transmitting the first communication signal and the second communication signal.
The current loop communication circuit, among the voltage sampling unit includes first resistance and second resistance, the one end of first resistance is connected switch module and live wire end, the other end of first resistance is connected switch module with the one end of second resistance, the other end of second resistance is connected rectification voltage stabilizing unit.
In the current loop communication circuit, the rectification voltage-stabilizing unit comprises a first diode, a third resistor and a first voltage-stabilizing diode, the anode of the first diode is connected with the other end of the second resistor, the cathode of the first diode is connected with one end of the third resistor, the cathode of the first voltage-stabilizing diode and the filtering unit, and the other end of the third resistor and the anode of the first voltage-stabilizing diode are connected with a zero line end.
In the current loop communication circuit, the filtering unit comprises a first capacitor and a second capacitor, one end of the first capacitor and the second capacitor are both connected with the cathode of the first voltage stabilizing diode, and the other end of the first capacitor and the other end of the second capacitor are both connected with a zero line end.
In the current loop communication circuit, the switching module comprises a current relay, a moving contact of the current relay is connected with one end of the first resistor, and a normally open contact of the current relay is connected with the other end of the first resistor and one end of the second resistor.
In the current loop communication circuit, the current loop unit comprises a fourth resistor, a fifth resistor, a first current limiting resistor, a second current limiting resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a second voltage stabilizing diode, a third voltage stabilizing diode, a second diode and a third diode; one end of the fourth resistor, one end of the third capacitor, the cathode of the second zener diode and one end of the fourth capacitor are all connected to the power module and the second communication unit, the other end of the fourth resistor and the other end of the third capacitor are all connected to the second communication unit, the anode of the second zener diode is connected to the cathode of the third zener diode, the anode of the third zener diode and the other end of the fourth capacitor are both connected to the anode of the second communication unit and the anode of the second diode, the cathode of the second diode is connected to one end of the first current limiting resistor, the other end of the first current limiting resistor is connected to the anode of the third diode through the second current limiting resistor, the cathode of the third diode is connected to the first communication unit, one end of the fifth resistor and one end of the fifth capacitor are both connected to the zero line and the first communication unit, the other end of the fifth resistor and the other end of the fifth capacitor are both connected with the first communication unit.
In the current loop communication circuit, the first communication unit comprises a first photoelectric coupler, a second photoelectric coupler, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a first triode; a 1 st pin of the first photoelectric coupler is connected with one end of the fifth resistor and one end of the fifth capacitor; a 2 nd pin of the first photoelectric coupler is connected with the other end of the fifth resistor, the other end of the fifth capacitor and a 3 rd pin of the second photoelectric coupler, the 3 rd pin of the first photoelectric coupler is connected with one end of the sixth resistor and one end of the seventh resistor, the other end of the sixth resistor is connected with one end of the sixth capacitor and the RXD1 signal end, and the other end of the sixth capacitor and the other end of the seventh resistor are grounded; a pin 4 of the second photoelectric coupler is connected with a negative electrode of the third diode, a pin 1 of the second photoelectric coupler is connected with a collector of the first triode and one end of the tenth resistor, a pin 2 of the second photoelectric coupler is connected with the other end of the tenth resistor and one end of the eleventh resistor, and the other end of the eleventh resistor is connected with power; one end of the emitter of the first triode and one end of the eighth resistor are grounded, and the other end of the eighth resistor is connected with a TXD1 signal end through the ninth resistor.
Compared with the prior art, the utility model provides a current loop communication circuit, including switching module, power module, detection module, work module and current loop communication module, the switching module is connected with the power module, the power module is still connected with the current loop communication module, the current loop communication module is still connected with the detection module and the work module respectively; the current loop communication module is used for transmitting a communication signal between the detection module and the working module, and the power supply module is used for providing working current for the current loop communication module; the detection module is used for detecting the working current of the current loop communication module, and when the working current is smaller than a preset current value, a detection signal is output to the working module, the working module controls the working state of the switching module according to the detection signal, the switching module is used for adjusting the power supply current of the power supply module, and stable communication between the indoor unit and the outdoor unit can be effectively realized under the condition that the air conditioner is at normal voltage or low voltage.
Drawings
Fig. 1 is a block diagram of a current loop communication circuit according to the present invention;
fig. 2 is a schematic circuit diagram of the current loop communication circuit provided by the present invention.
Detailed Description
An object of the utility model is to provide an electric current loop communication circuit can effectively realize the air conditioner under the condition of normal voltage or low-voltage, can both stable communication between indoor set and the off-premises station.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the following description of the present invention will refer to the accompanying drawings and illustrate embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 1, the present invention provides a current loop communication circuit, including a switching module 100, a power module 200, a detection module 300, a working module 400 and a current loop communication module 500, wherein the switching module 100 is connected to the power module 200, the power module 200 is further connected to the current loop communication module 500, the current loop communication module 500 is further connected to the detection module 300 and the working module 400, respectively, and the power module 200 is further connected to a live wire end and a neutral wire end; the current loop communication module 500 is configured to transmit a communication signal between the detection module 300 and the working module 400, and the power supply module 200 is configured to provide a working current for the current loop communication module 500; the detection module 300 is configured to detect a working current of the current loop communication module 500, and output a detection signal to the working module 400 when the working current is smaller than a preset voltage value, the working module 400 controls a working state of the switching module 100 according to the detection signal, and the switching module 100 is configured to adjust a power supply current of the power supply module 200.
In specific implementation, in this embodiment, the detection module 300 is a control part of an outdoor unit of an air conditioner, and the working module 400 is a control part of an indoor unit of the air conditioner; when the power supply is normally powered, that is, the working current of the current loop communication module 500 is in a normal state, at this time, the switching module 100 does not participate in the work, and the detection module 300 and the working module 400 are normally communicated through the current loop communication module 500; when the power supply voltage of the power supply is lower than the preset voltage value, the working current of the current loop communication module 500 is reduced under the condition that the total resistance in the current loop circuit does not change, so that when the working module 400 detects that the working current of the current loop communication module 500 is lower than the preset current value, the switching module 100 is controlled to access the circuit, the power supply current of the power supply module 200 is adjusted, the power supply current is increased, and the normal and stable communication between the detection module 300 and the detection module 300 is ensured. Preferably, the preset voltage value is 45V, the preset current value is 1mA in this embodiment, and the preset voltage value and the preset current value can be set by the detection module 300 according to actual conditions, which is not limited by the present invention.
Further, referring to fig. 2, the power module 200 includes a voltage sampling unit 210, a rectifying and voltage-stabilizing unit 220, and a filtering unit 230, wherein the voltage sampling unit 210 is connected to a live line end and a neutral line end, the voltage sampling unit 210 is further connected to the rectifying and voltage-stabilizing unit 220, the rectifying and voltage-stabilizing unit 220 is further connected to the filtering unit 230, and the filtering unit 230 is further connected to the current loop communication module 500; the voltage sampling unit 210 is configured to sample and divide a voltage of a power supply and output the voltage to the rectifying and voltage-stabilizing unit 220, the rectifying and voltage-stabilizing unit 220 is configured to rectify the power supply and output a direct current to the filtering unit 230, and the filtering unit 230 is configured to filter the direct current and output the filtered direct current to the current loop module.
When the power supply is normal, the power supply is sampled and limited by the voltage sampling unit 210 and then output to the rectifying and voltage stabilizing unit 220, the rectifying and voltage stabilizing unit 220 converts the power supply into direct current and then outputs the direct current to the filtering module, and the filtering unit 230 filters the direct current and then outputs the direct current to the current loop communication module 500, so as to provide stable working current for the current loop communication module 500 and ensure stable communication of the current communication module.
Further, the switching module 100 is specifically configured to adjust the voltage division value of the voltage sampling unit 210, and then adjust the working current, the switching module 100 is connected in parallel with the voltage sampling unit 210, when the power supply is too low, the detection module 300 outputs a detection signal to the working module 400, and then the working module 400 controls the switching module 100 to access the circuit, and then the voltage sampling unit 210 bypasses, and then the voltage division of the voltage sampling unit 210 is reduced, and then the voltage division of the current loop communication module 500 is increased, and the working current of the current loop communication module 500 is improved, so that the current loop communication unit obtains the normal working current, and performs stable communication.
Further, referring to fig. 2, the voltage sampling unit 210 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the switching module 100 and the live line end, the other end of the first resistor R1 is connected to one ends of the switching module 100 and the second resistor R2, the other end of the second resistor R2 is connected to the rectifying and voltage-stabilizing unit 220, and the switching module 100 is connected in parallel to two ends of the first resistor R1; when the power supply is normal, the power supply passes through the first resistor R1 to the second resistor R2, and then outputs a dc power to the current loop communication module 500 through the rectifying and voltage stabilizing unit 220 and the filtering unit 230; when the power supply is abnormal, the working module 400 controls the switching module 100 to access the circuit, so as to bypass the first resistor R1, thereby reducing the total resistance of the current loop communication circuit, increasing the working current of the current loop communication module 500, and ensuring that the communication of the current loop communication module 500 is normal.
Further, the switching module 100 includes a current relay K1, a moving contact of the current relay K1 is connected to one end of the first resistor R1, a normally open contact of the current relay K1 is connected to the other end of the first resistor R1 and one end of the second resistor R2, when the operating module 400 controls the current relay K1 to be connected to the circuit, the normally open contact of the current relay K1 is closed, so that the first resistor R1 is bypassed, the total resistance of the current loop communication circuit is reduced, the operating current is increased, the normal and stable communication of the current loop communication module 500 is ensured, and the stable communication of the indoor unit and the outdoor unit of the air conditioner can be ensured when the power voltage of the air conditioner is too low; meanwhile, the reliable operation of the air conditioner under the normal power supply voltage is not influenced, the voltage working range of the air conditioner allowed to operate is greatly widened, and the requirements of power grids in different regions are better met.
Further, the rectifying and voltage-stabilizing unit 220 includes a first diode D1, a third resistor R3, and a first zener diode ZD1, an anode of the first diode D1 is connected to the other end of the second resistor R2, a cathode of the first diode D1 is connected to one end of the third resistor R3, a cathode of the first zener diode ZD1, and the filtering unit 230, another end of the third resistor R3 and an anode of the first zener diode ZD1 are connected to a zero line, the first diode D1 is configured to perform half-wave rectification on the power supply to output direct current, and output the direct current to the filtering unit 230 after being stabilized by the first zener diode ZD1, so as to ensure that the current loop communication module 500 obtains stable working current.
Further, the filtering unit 230 includes a first capacitor C1 and a second capacitor C2, one end of the first capacitor C1 and the second capacitor C2 are both connected to the cathode of the first zener diode ZD1, the other end of the first capacitor C1 and the other end of the second capacitor C2 are both connected to the zero line end, and the direct current stabilized by the first zener diode ZD1 is filtered by the first capacitor C1 and the second capacitor C2 to obtain a stable direct current, so as to ensure normal communication of the current loop communication module 500.
Furthermore, the current loop communication module 500 includes a first communication unit 510, a second communication unit 520, and a current loop unit 530, where the first communication unit 510 is configured to output a first communication signal output by the detection module 300 to the second communication unit 520, and receive a second communication signal output by the second communication unit 520; the second communication unit 520 is configured to output a second communication signal output by the working module 400 to the first communication unit 510 and receive the first communication signal, and the current loop unit 530 is configured to transmit the first communication signal and the second communication signal, in this embodiment, the first communication unit 510 is a communication part of an outdoor unit, the second communication unit 520 is a communication part of an indoor unit, and communication between an indoor unit and an outdoor unit of an air conditioner is achieved through the first communication unit 510 and the second communication unit 520.
Preferably, the detection module 300 includes a first control chip, the working module 400 includes a second control chip, the first control chip is connected to the first communication unit 510, and the second control chip is connected to the second communication unit 520, in this embodiment, the models of the first control chip and the second control chip are both R5F100LE, although in other embodiments, control chips with the same function may be selected, which is not limited in this embodiment; the first control chip detects the working current of the current loop communication module 500, when the working current is smaller than a preset value, a detection signal is output to the second control chip, the second control chip controls the normally open contact of the current relay K1 to be closed, the first resistor R1 is bypassed, the total resistance of the current loop communication circuit is reduced, and the working current of the current loop communication module 500 is increased; certainly, when the working current of the current loop communication module 500 is too small, the communication of the current loop communication module 500 is abnormal, and at this time, the second control chip cannot receive the communication signal correspondingly, so that the normally open contact of the current relay K1 can be controlled to be closed, and the working current of the current loop communication module 500 is adjusted.
Further, the current loop unit 530 includes a fourth resistor R4, a fifth resistor R5, a first current limiting resistor RC1, a second current limiting resistor RC2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a second zener diode ZD2, a third zener diode ZD3, a second diode D2, and a third diode D3; one end of the fourth resistor R4, one end of the third capacitor C3, a cathode of the second zener diode ZD2, and one end of the fourth capacitor C4 are all connected to the power module 200 and the second communication unit 520, the other end of the fourth resistor R4 and the other end of the third capacitor C3 are all connected to the second communication unit 520, an anode of the second zener diode ZD2 is connected to a cathode of the third zener diode ZD3, an anode of the third zener diode ZD3 and the other end of the fourth capacitor C4 are both connected to an anode of the second communication unit 520 and an anode of the second diode D2, a cathode of the second diode D2 is connected to one end of the first current limiting resistor RC1, the other end of the first current limiting resistor RC1 is connected to an anode of the third diode D3 through the second current limiting resistor RC2, and a cathode of the third diode D3 is connected to the first communication unit 510, one end of the fifth resistor R5 and one end of the fifth capacitor C5 are both connected to the neutral terminal and the first communication unit 510, and the other end of the fifth resistor R5 and the other end of the fifth capacitor C5 are both connected to the first communication unit 510, wherein the current in the current loop unit 530 is kept within a certain range by the current limitation of the first current limiting resistor RC1 and the second current limiting resistor RC2, so that the stable communication of the current loop unit 530 is ensured.
Further, the first communication unit 510 includes a first photocoupler PC1, a second photocoupler PC2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a first triode Q1; a 1 st pin of the first photocoupler PC1 is connected with one end of the fifth resistor R5 and one end of the fifth capacitor C5; a 2 nd pin of the first photocoupler PC1 is connected with the other end of the fifth resistor R5, the other end of the fifth capacitor C5 and a 3 rd pin of the second photocoupler PC2, a 3 rd pin of the first photocoupler PC1 is connected with one end of the sixth resistor R6 and one end of the seventh resistor R7, the other end of the sixth resistor R6 is connected with one end of the sixth capacitor C6 and the RXD1 signal end, and the other end of the sixth capacitor C6 and the other end of the seventh resistor R7 are grounded; a 4 th pin of the second photocoupler PC2 is connected to a negative electrode of the third diode D3, a 1 st pin of the second photocoupler PC2 is connected to a collector of the first transistor Q1 and one end of the tenth resistor R10, a 2 nd pin of the second photocoupler PC2 is connected to the other end of the tenth resistor R10 and one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is electrically connected; the emitter of the first triode Q1 and one end of the eighth resistor R8 are grounded, the other end of the eighth resistor R8 is connected to the TXD1 signal terminal through the ninth resistor R9, and the first control chip is connected to the RXD1 signal terminal and the TXD1 signal terminal.
The first photocoupler PC1, the sixth resistor R6, the seventh resistor R7 and the sixth resistor R6 form an outdoor unit receiving circuit, and the second photocoupler PC2, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11 and the first triode Q1 form an outdoor unit transmitting circuit, so that the receiving and the transmitting of communication signals are completed.
Further, the second communication unit 520 includes a third photo coupler PC3, a fourth photo coupler PC4, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, a second triode Q2, and a seventh capacitor C7; one end of the twelfth resistor R12 and one end of the seventh capacitor C7 are both connected to the RXD2 signal terminal, the other end of the seventh capacitor C7 is grounded, the other end of the twelfth resistor R12 and one end of the thirteenth resistor R13 are both connected to the 3 rd pin of the third photocoupler PC3, the other end of the thirteenth resistor R13 is grounded, the 4 th pin of the third photocoupler PC3 is electrically connected, the 1 st pin of the third photocoupler PC3 is connected to the other end of the fourth resistor R4, the other end of the third capacitor C3 and the 4 th pin of the fourth photocoupler PC4, the 3 rd pin of the fourth photocoupler PC4 is connected to the positive electrode of the third zener diode 3, the positive electrode of the second diode D2 and the other end of the fourth capacitor C4, the 1 st pin of the fourth photocoupler PC4 is connected to the fifteenth terminal of the resistor R6327 and the collector ZD Q2 of the fourth capacitor C15, the 2 nd pin of the fourth photocoupler PC4 is connected to the other end of the fifteenth resistor R15 and one end of the fourteenth resistor R14, the other end of the fourteenth resistor R14 is connected to power, the emitter of the second triode Q2 and one end of the seventeenth resistor R17 are both grounded, the collector of the second triode Q2 is connected to the other end of the seventeenth resistor R17 and is connected to the TXD2 signal terminal through the sixteenth resistor R16, and the second control chip is connected to the TXD2 signal terminal and the RXD2 signal terminal.
The third photocoupler PC3, the twelfth resistor R12, the thirteenth resistor R13 and the seventh capacitor C7 form an indoor unit receiving circuit, and the fourth photocoupler PC4, the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16, the seventeenth resistor R17 and the second triode Q2 form an indoor unit transmitting circuit.
When the current loop communication circuit is in a state that the outdoor unit sends a communication signal and the indoor unit receives the communication signal, the indoor unit TXD2 is set to be at a high level, the fourth photoelectric coupler PC4 is in a conducting state at this time, if the outdoor unit sends a high level "1", the second photoelectric coupler PC2 is conducted, the current loop module is closed loop, the first photoelectric coupler PC1 and the third photoelectric coupler PC3 are both conducted, and the RXD2 receives a high level "1"; if the outdoor unit sends a low level "0", the second photoelectric coupler PC2 is cut off, the current loop communication module 500 is opened, the first photoelectric coupler PC1 and the third photoelectric coupler PC3 are both cut off, and the RXD2 signal end receives a low level "0", thereby completing transmission of communication signals from the outdoor unit to the indoor unit; similarly, when a communication signal is sent from the indoor unit to the outdoor unit, the principle is the same, and details are not repeated herein, wherein the first photocoupler PC1, the second photocoupler PC2, the third photocoupler PC3 and the fourth photocoupler PC4 all play an isolating role, so that a strong current in the current loop unit 530 can be effectively prevented from being connected in series to the first control chip and the second control chip, and the first control chip and the second control chip are damaged.
When the power voltage is too low, the working current of the current loop unit 530 is small enough to make the isolation optocoupler saturated and conducted, so that communication data in the current loop unit 530 is distorted, the second control chip will detect that the communication is abnormal, and the first control chip will also detect that the working current of the current loop is too small, so that the second control chip will control the current relay K1 to be closed, the first resistor R1 is bypassed, the total resistance in the current loop communication circuit becomes small, so that the working current of the current loop unit 530 is increased, and the communication returns to normal, the current loop communication circuit of the present embodiment can ensure stable communication between the indoor unit and the outdoor unit under the condition that the power voltage is too low, and meanwhile, the reliable operation of the air conditioner under the normal power voltage is not affected, so that the voltage working range of the air conditioner allowed to operate is greatly widened, the power grid requirements of different regions are better met.
To sum up, the current loop communication circuit of the present invention comprises a switching module, a power module, a detection module, a working module and a current loop communication module, wherein the switching module is connected to the power module, the power module is further connected to the current loop communication module, and the current loop communication module is further connected to the detection module and the working module respectively; the current loop communication module is used for transmitting a communication signal between the detection module and the working module, and the power supply module is used for providing working current for the current loop communication module; the detection module is used for detecting the working current of the current loop communication module, and when the working current is smaller than a preset current value, a detection signal is output to the working module, the working module controls the working state of the switching module according to the detection signal, the switching module is used for adjusting the power supply current of the power supply module, and stable communication between the indoor unit and the outdoor unit can be effectively realized under the condition that the air conditioner is at normal voltage or low voltage.
It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.
Claims (10)
1. A current loop communication circuit is characterized by comprising a switching module, a power supply module, a detection module, a working module and a current loop communication module, wherein the switching module is connected with the power supply module, the power supply module is also connected with the current loop communication module, and the current loop communication module is also respectively connected with the detection module and the working module; the current loop communication module is used for transmitting a communication signal between the detection module and the working module, and the power supply module is used for providing working current for the current loop communication module; the detection module is used for detecting the working current of the current loop communication module, and when the working current is smaller than a preset current value, a detection signal is output to the working module, the working module controls the working state of the switching module according to the detection signal, and the switching module is used for adjusting the power supply current of the power supply module.
2. The current loop communication circuit according to claim 1, wherein the power module comprises a voltage sampling unit, a rectifying and voltage-stabilizing unit and a filtering unit, the voltage sampling unit is configured to sample and divide a power supply and output the power supply to the rectifying and voltage-stabilizing unit, the rectifying and voltage-stabilizing unit is configured to rectify the power supply and output a direct current to the filtering unit, and the filtering unit is configured to filter the direct current and output the direct current to the current loop communication module.
3. A current loop communication circuit according to claim 2, wherein the switching module is specifically configured to adjust a voltage division value of the voltage sampling unit, thereby adjusting the operating current.
4. The current loop communication circuit according to claim 1, wherein the current loop communication module comprises a first communication unit, a second communication unit and a current loop unit, the first communication unit is configured to output a first communication signal output by the detection module to the second communication unit and receive a second communication signal output by the second communication unit; the second communication unit is used for outputting a second communication signal output by the working module to the first communication unit and receiving the first communication signal, and the current loop unit is used for transmitting the first communication signal and the second communication signal.
5. A current loop communication circuit according to claim 2, wherein the voltage sampling unit comprises a first resistor and a second resistor, one end of the first resistor is connected to the switching module and the live wire end, the other end of the first resistor is connected to the switching module and one end of the second resistor, and the other end of the second resistor is connected to the rectifying and voltage stabilizing unit.
6. A current loop communication circuit according to claim 5, wherein the rectifying and voltage stabilizing unit comprises a first diode, a third resistor and a first voltage stabilizing diode, wherein an anode of the first diode is connected to the other end of the second resistor, a cathode of the first diode is connected to one end of the third resistor, a cathode of the first voltage stabilizing diode and the filtering unit, and the other end of the third resistor and an anode of the first voltage stabilizing diode are connected to a zero line end.
7. A current loop communication circuit according to claim 6, wherein the filtering unit comprises a first capacitor and a second capacitor, one end of the first capacitor and the second capacitor are both connected to the cathode of the first zener diode, and the other end of the first capacitor and the other end of the second capacitor are both connected to a neutral terminal.
8. A current loop communication circuit according to claim 5, wherein said switching module comprises a current relay having a movable contact connected to one end of said first resistor and a normally open contact connected to the other end of said first resistor and one end of said second resistor.
9. A current loop communication circuit according to claim 4, wherein the current loop unit comprises a fourth resistor, a fifth resistor, a first current limiting resistor, a second current limiting resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a second zener diode, a third zener diode, a second diode, and a third diode; one end of the fourth resistor, one end of the third capacitor, the cathode of the second zener diode and one end of the fourth capacitor are all connected to the power module and the second communication unit, the other end of the fourth resistor and the other end of the third capacitor are all connected to the second communication unit, the anode of the second zener diode is connected to the cathode of the third zener diode, the anode of the third zener diode and the other end of the fourth capacitor are both connected to the anode of the second communication unit and the anode of the second diode, the cathode of the second diode is connected to one end of the first current limiting resistor, the other end of the first current limiting resistor is connected to the anode of the third diode through the second current limiting resistor, the cathode of the third diode is connected to the first communication unit, one end of the fifth resistor and one end of the fifth capacitor are both connected to the zero line and the first communication unit, the other end of the fifth resistor and the other end of the fifth capacitor are both connected with the first communication unit.
10. A current loop communication circuit according to claim 9, wherein the first communication unit comprises a first photocoupler, a second photocoupler, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a sixth capacitor and a first triode; a 1 st pin of the first photoelectric coupler is connected with one end of the fifth resistor and one end of the fifth capacitor; a 2 nd pin of the first photoelectric coupler is connected with the other end of the fifth resistor, the other end of the fifth capacitor and a 3 rd pin of the second photoelectric coupler, the 3 rd pin of the first photoelectric coupler is connected with one end of the sixth resistor and one end of the seventh resistor, the other end of the sixth resistor is connected with one end of the sixth capacitor and an RXD1 signal end, and the other end of the sixth capacitor and the other end of the seventh resistor are grounded; a pin 4 of the second photoelectric coupler is connected with a negative electrode of the third diode, a pin 1 of the second photoelectric coupler is connected with a collector of the first triode and one end of the tenth resistor, a pin 2 of the second photoelectric coupler is connected with the other end of the tenth resistor and one end of the eleventh resistor, and the other end of the eleventh resistor is connected with power; one end of the emitter of the first triode and one end of the eighth resistor are grounded, and the other end of the eighth resistor is connected with a TXD1 signal end through the ninth resistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921994932.7U CN211953182U (en) | 2019-11-18 | 2019-11-18 | Current loop communication circuit |
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| CN201921994932.7U CN211953182U (en) | 2019-11-18 | 2019-11-18 | Current loop communication circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112524686A (en) * | 2020-11-30 | 2021-03-19 | 青岛海尔空调器有限总公司 | Air conditioner |
| CN114285439A (en) * | 2021-12-22 | 2022-04-05 | 珠海格力电器股份有限公司 | Current loop communication circuit and air conditioner |
| CN114576702A (en) * | 2020-11-30 | 2022-06-03 | 青岛海尔空调器有限总公司 | Air conditioner |
-
2019
- 2019-11-18 CN CN201921994932.7U patent/CN211953182U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112524686A (en) * | 2020-11-30 | 2021-03-19 | 青岛海尔空调器有限总公司 | Air conditioner |
| CN114576702A (en) * | 2020-11-30 | 2022-06-03 | 青岛海尔空调器有限总公司 | Air conditioner |
| CN114576702B (en) * | 2020-11-30 | 2024-02-20 | 青岛海尔空调器有限总公司 | Air conditioner |
| CN114285439A (en) * | 2021-12-22 | 2022-04-05 | 珠海格力电器股份有限公司 | Current loop communication circuit and air conditioner |
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