CN212627895U - Communication system and electrical equipment - Google Patents
Communication system and electrical equipment Download PDFInfo
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- CN212627895U CN212627895U CN202021024574.XU CN202021024574U CN212627895U CN 212627895 U CN212627895 U CN 212627895U CN 202021024574 U CN202021024574 U CN 202021024574U CN 212627895 U CN212627895 U CN 212627895U
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Abstract
The utility model is suitable for an electronic circuit technical field provides a communication system and electrical equipment, including host computer and slave computer, connect through two-wire cable between host computer and the slave computer, the host computer includes first MCU unit, constant voltage source unit and current detection unit, the slave computer includes second MCU unit, constant current source unit and voltage detection unit; the constant voltage source unit generates and sends a voltage signal to the slave; the constant current source unit generates and sends a current signal to the host; the current detection unit detects a current signal, converts the current signal into a binary state signal and sends the binary state signal to the first MCU unit; the voltage detection unit detects a voltage signal, converts the voltage signal into a binary state signal and sends the binary state signal to the second MCU unit; the first MCU unit converts the binary state signal expressed by the current signal into a binary signal; the second MCU unit converts the binary state signal expressed by the voltage signal into a binary signal. The communication system has stronger anti-interference capability and longer communication distance.
Description
Technical Field
The utility model belongs to the technical field of the electronic circuit, especially, relate to a communication system and electrical equipment.
Background
The continuously increasing number of power consuming devices is used in the present residential, work and leisure areas to provide the user with a variety of possibilities and convenience. At the same time, the comfort during the start-up, in particular during the operation of the individual consumers, is to be increasingly improved.
In the prior art, the power supply to the power consuming devices is usually wired, while the communication is usually performed wirelessly, for example, by radio transmission, infrared transmission, ultrasonic transmission, or the like. The wireless communication mode has poor anti-interference capability and is easy to interfere, so that the power consumption equipment can work wrongly and can not work according to the requirements of users.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a communication system aims at improving communication line's interference killing feature, improves its work accuracy to improve user experience.
The embodiment of the utility model provides a realize like this, a communication system, including host computer and follow machine, the host computer with pass through two line cable between the machine, the host computer includes first MCU unit, constant voltage source unit and current detection unit, follow machine and include second MCU unit, constant current source unit and voltage detection unit; the constant voltage source unit is used for generating and sending a voltage signal to the slave;
the constant current source unit is used for generating and sending a current signal to the host;
the current detection unit is used for detecting the current signal, converting the current signal into a binary state signal and sending the binary state signal to the first MCU unit;
the voltage detection unit is used for detecting the voltage signal, converting the voltage signal into a binary state signal and sending the binary state signal to the second MCU unit;
the first MCU unit is used for converting a binary state signal expressed by the current signal into a binary signal;
and the second MCU unit is used for converting the binary state signal expressed by the voltage signal into a binary signal.
Still further, the constant voltage power supply unit includes: the first triode, the first voltage-stabilizing diode and the second voltage-stabilizing diode, the emitting electrode of the first triode is connected with the two-wire cable and the negative electrode of the first voltage-stabilizing diode respectively, the collecting electrode of the first triode is connected with the positive electrode of the first voltage-stabilizing diode and the negative electrode of the second voltage-stabilizing diode respectively, and the positive electrode of the second voltage-stabilizing diode is connected with the grounding terminal.
Still further, the constant voltage power supply unit further includes: a second triode, a third triode, a fourth triode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a first capacitor, wherein an emitting electrode of the second triode is respectively connected with one end of the first resistor, one end of the second resistor and one end of the first capacitor, a collecting electrode of the second triode is respectively connected with the other end of the second resistor and one end of the third resistor, a base electrode of the second triode is respectively connected with the other end of the first resistor and a collecting electrode of the third triode, an emitting electrode of the third triode is connected with one end of the fourth resistor, a base electrode of the third triode is connected with a negative electrode of the second voltage stabilizing diode, a collecting electrode of the fourth triode is connected with the other end of the third resistor, and a base electrode of the fourth triode is respectively connected with the other end of the fourth resistor and the first MCU unit, and the emitter of the fourth triode is connected with one end of the fifth resistor, the other end of the fifth resistor is connected with the grounding end, and the other end of the first capacitor is connected with the base of the first triode.
Still further, the current detection unit includes: the sampling circuit comprises a comparator, a sampling resistor, a first threshold resistor, a second threshold resistor and a threshold adjusting resistor, wherein the in-phase input end of the comparator is connected with the threshold adjusting resistor, the other end of the threshold adjusting resistor is connected with the sampling resistor, the other end of the sampling resistor is connected with a grounding end, the reverse phase input end of the comparator is respectively connected with the first threshold resistor and the second threshold resistor, and the output end of the comparator is connected with a first MCU unit.
Still further, the current detection unit further includes: a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a second capacitor, a third capacitor and a fourth capacitor, wherein one end of the sixth resistor is connected to the first MCU, the other end of the sixth resistor is connected to the output end of the comparator, one end of the seventh resistor and one end of the eighth resistor, the other end of the seventh resistor is connected to the first threshold resistor and the power end, the other end of the eighth resistor is connected to the ground terminal, the ninth resistor is connected to the power end, the other end of the ninth resistor is connected to the non-inverting input end of the comparator and one end of the third capacitor, the other end of the third capacitor is connected to the ground terminal, the second capacitor is connected to the power end of the comparator, the other end of the second capacitor is connected to the ground terminal, and the fourth capacitor is connected to the second threshold resistor and the inverting input end of the comparator, the other end of the fourth capacitor is connected with a grounding end, and the other end of the second threshold resistor is connected with the grounding end.
Further, the constant current source unit includes: the emitter of the fifth triode is connected with the eleventh resistor, the base of the fifth triode is respectively connected with the twelfth resistor and the collector of the sixth triode, the emitter of the sixth triode is connected with the thirteenth resistor, and the base of the sixth triode is respectively connected with the fourteenth resistor and the fifteenth resistor.
Still further, the constant current source unit further includes: the high-voltage switch comprises a third diode, a fourth diode and a sixteenth resistor, wherein one end of the sixteenth resistor is connected with the negative electrode of the third diode and the positive electrode of the fourth diode respectively, the other end of the sixteenth resistor is connected with the collector electrode of the fifth triode, the positive electrode of the third diode is connected with the thirteenth resistor and the grounding end respectively, and the negative electrode of the fourth diode is connected with the other end of the eleventh resistor and the other end of the twelfth resistor respectively.
Still further, the voltage detection unit includes: the collector of the seventh triode is connected with the seventeenth resistor, and the negative electrode of the fifth voltage-stabilizing diode is connected with the two-wire cable.
Still further, the voltage detection unit further includes: the high-voltage power supply comprises an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a fifth capacitor, a sixth capacitor and a seventh capacitor, wherein one end of the eighteenth resistor is connected with the anode of the fifth voltage stabilizing diode, the other end of the eighteenth resistor is respectively connected with the nineteenth resistor, the sixth capacitor and the base electrode of the seventh triode, the fifth capacitor is connected with the cathode of the fifth voltage stabilizing diode, one end of the seventh capacitor is respectively connected with the collector electrode of the seventh triode and the twentieth resistor, the other end of the seventh capacitor is respectively connected with the emitter electrode and the grounding terminal of the seventh triode, and the other end of the nineteenth resistor is respectively connected with the other end of the fifth capacitor, the other end of the sixth capacitor and the grounding terminal.
Furthermore, the system also comprises a power-taking control unit and a DC-DC unit,
the power-taking control unit is used for controlling a path of the DC-DC unit to acquire an input voltage according to the power consumption of the host under the control of the first MCU unit;
and the DC-DC unit is used for converting the received voltage signal and current signal into power supply voltage required by the work of the host machine by the host machine.
Further, the power-taking control unit includes: an eighth triode, a ninth triode, a thirteenth triode, an eleventh triode, a twelfth triode, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor and a thirty-third resistor, wherein an emitter of the eighth triode is connected with one end of the twenty-first resistor, a base of the eighth triode is respectively connected with the other end of the twenty-first resistor and one end of the twenty-second resistor, a collector of the eighth triode is connected with one end of the twenty-fifth resistor, a collector of the ninth triode is connected with the other end of the twenty-second resistor, a base of the ninth triode is connected with the twenty-third resistor, an emitter of the ninth triode is connected with the twenty-fourth resistor, and a base of the thirteenth triode is connected with one end of the twenty-sixth resistor, the twenty-fifth resistor other end and the collecting electrode of eleventh triode are connected respectively to the twenty-sixth resistor other end, twenty-seventh resistor is connected to the projecting pole of eleventh triode, the base of eleventh triode is connected twenty-eighth resistor one end, the twenty-eighth resistor other end is connected respectively the twenty-ninth resistor and the collecting electrode of twelfth triode, the base of twelfth triode is connected the thirty resistance, the earthing terminal is connected to the projecting pole of twelfth triode.
The embodiment of the utility model provides an electrical equipment is still provided, including above-mentioned embodiment communication system.
Compared with the prior art, the utility model provides a pair of communication system has following beneficial effect: in the application, the master machine and the slave machine are connected through a two-wire cable, the master machine sends a voltage signal to the slave machine, the slave machine sends a current signal to the master machine, a second MCU unit in the slave machine converts the received voltage signal into a binary signal to perform corresponding communication work, and a first MCU unit in the master machine converts the received current signal into the binary signal to perform corresponding communication work. Because the current signal has stronger interference resistance to the outside, the communication system has stronger interference resistance and longer communication distance, and improves the working accuracy of the communication system so as to improve the user experience.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a communication system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another communication system according to an embodiment of the present invention;
fig. 4 is a circuit diagram of another communication system according to an embodiment of the present invention;
fig. 5 is a circuit diagram of another communication system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to effectively explain the embodiments of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the prior art, the power supply to the power consuming devices is usually wired, while the communication is usually performed wirelessly, for example by radio transmission, infrared transmission, ultrasonic transmission, or the like. The wireless communication mode has poor anti-interference capability and is easy to interfere, so that the power consumption equipment can work wrongly and can not work according to the requirements of users.
In the present application, the master unit 8 and the slave unit 9 are connected by the two-wire cable 7, the master unit 8 sends a voltage signal to the slave unit 9, the slave unit 9 sends a current signal to the master unit 8, the second MCU unit 11 in the slave unit 9 converts the received voltage signal into a binary signal to perform a corresponding communication operation, and the first MCU unit 10 in the master unit 8 converts the received current signal into a binary signal to perform a corresponding communication operation. Because the current signal has stronger interference resistance to the outside, the communication circuit has stronger interference resistance and longer communication distance, and improves the working accuracy of the communication circuit so as to improve the user experience.
As shown in fig. 1, the present application provides a communication system comprising: the master 8 comprises a first MCU unit 10, a constant voltage source unit 2 and a current detection unit 1, and the slave 9 comprises a second MCU unit 11, a constant current source unit 6 and a voltage detection unit 5.
A constant voltage source unit 2 for generating and sending a voltage signal to the slave 9.
And the constant current source unit 6 is used for generating and sending a current signal to the host 8.
And a current detection unit 1 for detecting the current signal and transmitting the current signal to the first MCU unit 10.
And a voltage detection unit 5 for detecting the voltage signal and transmitting the voltage signal to the second MCU unit 11.
The first MCU unit 10 is configured to convert the binary state signal expressed by the current signal into a binary signal.
And the second MCU unit 11 is used for converting the binary state signal expressed by the voltage signal into a binary signal.
The master machine 8 and the slave machine 9 are connected by a two-wire cable 7, the constant voltage source unit 2 in the master machine 8 generates and sends a voltage signal to the slave machine 9, the voltage detection unit 5 in the slave machine 9 detects the voltage signal and converts the voltage signal into a binary state signal to send the binary state signal to the second MCU unit 11, the second MCU unit 11 converts the received binary state signal into a binary signal, and the slave machine 9 performs corresponding operation according to the binary signal. For example, the second MCU 11 receives a high voltage, and a low voltage, and converts the signals into binary signals 110, where the binary signals 110 represent some control signals, and the slave 9 performs corresponding actions according to the control signals. For example, the communication system may be applied to heating and ventilation equipment, and 110 may represent temperature rise, and the slave 9 performs corresponding temperature rise operation according to the received control signal.
The constant current source unit 6 in the slave 9 generates and transmits a current signal to the master 8, the current detection unit 1 in the master 8 detects the current signal transmitted from the slave 9, converts the current signal into a binary state signal and transmits the binary state signal to the first MCU unit 10, the first MCU unit 10 converts the received binary state signal into a binary signal, and the master 8 performs corresponding operations according to the binary signal.
Further, a bridge rectifier circuit D1 is connected between the two-wire cable 7 and the main unit 8. The bridge rectifier circuit D1 includes 4 port pins, where the port pin 1 and the port pin 2 of the bridge rectifier circuit D1 are connected to one end of the interface 2 and one end of the interface 1 of the interface CN1, respectively. The other end of the interface 2 and the other end of the interface 1 of the interface CN1 are connected to the two-wire cable 7. The port pin 3 of the bridge rectifier circuit D1 is connected to the constant voltage power supply unit 2. The port pin 4 of the bridge rectifier circuit D1 is connected to the current detection unit 1
Further, as shown in fig. 2, the constant voltage source unit 2 includes: the first triode T4, the first zener diode DZ1 and the second zener diode DZ203, the emitter of the first triode T4 is connected to the two-wire cable 7 and the cathode of the first zener diode DZ1 respectively, the collector of the first triode T4 is connected to the anode of the first zener diode DZ1 and the cathode of the second zener diode DZ203 respectively, and the anode of the second zener diode DZ203 is connected to the ground terminal. (the following parts are to be consistent with the description of the preceding claims)
Further, the constant voltage source unit 2 further includes: a second triode T20, a third triode T2, a fourth triode T3, a first resistor RT1, a second resistor R99, a third resistor R98, a fourth resistor R97, a fifth resistor RT27 and a first capacitor CT19, wherein an emitter of the second triode T20 is connected to one end of the first resistor RT1, one end of the second resistor R99 and one end of the first capacitor CT19, a collector of the second triode T20 is connected to the other end of the second resistor R99 and one end of the third resistor R98, a base of the second triode T20 is connected to the other end of the first resistor RT1 and a collector of the third triode T2, an emitter of the third triode T2 is connected to one end of the fourth resistor R97, a base of the third triode T2 is connected to a cathode of the second zener diode DZ203, a collector of the fourth triode T3 is connected to the other end of the third resistor R98, a base of the fourth triode T3 is connected to the other end of the third resistor R97 and the first MCU 3910, an emitter of the fourth triode T3 is connected to one end of a fifth resistor RT27, the other end of the fifth resistor RT27 is connected to the ground terminal, and the other end of the first capacitor CT19 is connected to the base of the first triode T4. The other end of the first capacitor CT19 is further connected to the collector of the fourth transistor T3 and the other end of the third resistor R98.
Specifically, the constant voltage power supply unit 2 is a high and low level generation output circuit of the host 8. The first zener diode DZ1 and the second zener diode DZ203 are connected in series when the first transistor T4 is turned off. The first transistor T4 is a switch, when the first transistor T4 is turned on in saturation, the voltage outputted from the host to the two-wire cable 7 is a low voltage, and the voltage value of the low level is determined by the voltage value of the second zener diode DZ 203. When T4 is turned off, the voltage output from the host to the two-wire cable 7 is a high voltage determined by the voltage value of the series connection of the second zener diode DZ203 and the first zener diode DZ 1. The third transistor T2, the fourth transistor T3, and the second transistor T20 assist the first transistor T4 in performing more reliable switching control, and the MASTER-Tx is a control signal for switching between high and low voltages and is sent by the first MCU unit 10. The third triode T2 works in a micro-conducting state, when the control signal MASTER-Tx sent by the first MCU unit 10 is a control signal of high voltage, the collector current of the third triode T2 is small, and since the current on the first resistor RT1 is fixed, the base current of the second triode T20 is small, at this time, the second triode T20 is in a cut-off state, the current of the third resistor R98 is small, and the collector current of the fourth triode T3 is large, so that the base current of the first triode T4 is large, at this time, the first triode T4 is in a saturated state, and the voltage output by the host to the two-wire cable 7 is determined by the voltage of the DZ203 and is low voltage; when the control signal MASTER-Tx sent by the first MCU unit 10 is a low-voltage control signal, the collector current of the third transistor T2 is large, and the base current of the second transistor T20 is large due to the constant current of the first resistor RT1, at this time, the second transistor T20 is in a saturation state, the current of the third resistor R98 is large, and the fourth transistor T3 is in a cut-off state, so that the base current of the first transistor T4 is almost zero, at this time, the first transistor T4 is in a cut-off state, and the voltage output by the host to the two-wire cable 7 is determined by the voltage value of the series connection of the second zener diode DZ203 and the first zener diode DZ1, and is a high voltage.
Note that, the port pin 3 of the bridge rectifier circuit D1 is connected to one end of the first resistor RT 1.
Further, referring to fig. 2, the current detection unit 1 includes: the circuit comprises a comparator IC1A, a sampling resistor RT13, a first threshold resistor RT9, a second threshold resistor RT22 and a threshold adjusting resistor RT12, wherein the non-inverting input end of the comparator IC1A is connected with the threshold adjusting resistor RT12, the other end of the threshold adjusting resistor RT12 is connected with the sampling resistor RT13, the other end of the sampling resistor RT13 is connected with the ground terminal, the inverting input end of the comparator IC1A is respectively connected with the first threshold resistor RT9 and the second threshold resistor RT22, and the output end of the comparator IC1A is connected with the first MCU 10.
Further, referring to fig. 2, the current detection unit 1 further includes: a sixth resistor RT25, a seventh resistor RT11, an eighth resistor RT21, a ninth resistor RT10, a second capacitor CT21, a third capacitor CT20 and a fourth capacitor CT7, wherein one end of the sixth resistor RT25 is connected to the first MCU unit 10, the other end of the sixth resistor RT25 is connected to the output terminal of the comparator IC1A, one end of the seventh resistor RT11 and one end of the eighth resistor RT21, the other end of the seventh resistor RT11 is connected to the first threshold resistor 9 and the power terminal, the other end of the eighth resistor RT21 is connected to the ground terminal, the ninth resistor RT10 is connected to the power terminal, the other end of the ninth resistor RT10 is connected to the non-inverting input terminal of the comparator IC1A and one end of the third capacitor CT20, the other end of the third capacitor CT20 is connected to the ground terminal, the second capacitor CT21 is connected to the power terminal of the comparator IC1A, the other end of the second capacitor CT A is connected to the ground terminal, and the fourth capacitor CT A is connected to the inverting input terminal of the second threshold. The other end of the fourth capacitor CT7 is connected to ground, and the other end of the second threshold resistor RT22 is connected to ground. The threshold adjustment resistor RT12 is connected between one end of the third capacitor CT20 and the sampling resistor RT 13. That is, one end of the threshold adjusting resistor RT12 is connected to one end of the third capacitor CT20, the other end of the threshold adjusting resistor RT12 is connected to one end of the sampling resistor RT13, and the other end of the sampling resistor RT13 is connected to the ground.
Specifically, the current detection unit 1 is a current detection circuit of the host computer 8. The sampling resistor RT13 is used for current sampling, and the voltage divider circuit of the first threshold resistor RT9 and the second threshold resistor RT22 determines the voltage of the inverting terminal 2 pin of the comparator IC1A, and the voltage determines the magnitude of the current detection threshold. The voltage of the sampling resistor RT13 is obtained according to the current flowing through the sampling resistor RT13, the voltage of the sampling resistor RT13 is compared with the threshold voltage through the comparator IC1A, and if the voltage of the sampling resistor RT13 is larger than the threshold voltage, the MASTER-Rx output by the pin 1 at the output end of the comparator IC1A is a high-level VCC voltage signal. If the voltage of the sampling resistor RT13 is less than the threshold voltage, the output terminal pin 1 output MASTER-Rx of the comparator IC1A is a low level 0V signal. The ninth resistor RT10 is a bias resistor, the threshold adjustment resistor RT12 can fine-tune the threshold current, and the seventh resistor RT11 is a pull-up resistor at the output terminal 1 pin of the comparator IC 1A. The eighth resistor RT21 is a pull-down resistor at pin 1 of the output of the comparator IC 1A. The output signal MASTER-Rx varies in both 0V and VCC and represents binary information sent from the slave 9 to the MASTER 8.
It should be noted that the threshold voltage is preset, and the application is not limited to this.
The port pin 4 of the bridge rectifier circuit D1 is connected to the other end of the threshold adjustment resistor RT12 and one end of the sampling resistor RT 13.
Further, as shown in fig. 5, the constant current source unit 6 includes: the transistor comprises a fifth triode TN1, a sixth triode TTN12, an eleventh resistor R2, a twelfth resistor RR56, a thirteenth resistor RR55, a fourteenth resistor RR58 and a fifteenth resistor RR59, wherein an emitter of the fifth triode TN1 is connected with the eleventh resistor R2, a base of the fifth triode TN1 is respectively connected with collectors of the twelfth resistor RR56 and the sixth triode TTN12, an emitter of the sixth triode TTN12 is connected with the thirteenth resistor RR55, and a base of the sixth triode TTN12 is respectively connected with the fourteenth resistor RR58 and the fifteenth resistor RR 59.
As shown with reference to fig. 5, the constant current source unit 6 further includes: one end of a sixteenth resistor R1 is connected to the negative electrode of the third diode D35 and the positive electrode of the fourth diode D34, the other end of the sixteenth resistor R1 is connected to the collector of the fifth triode TN1, the positive electrode of the third diode D35 is connected to the thirteenth resistor RR55 and the ground, and the negative electrode of the fourth diode D34 is connected to the other end of the eleventh resistor R2 and the other end of the twelfth resistor RR 56. The other end of the twelfth resistor RR56 is connected to a power supply, and the other end of the eleventh resistor R2 is also connected to the power supply.
Specifically, the constant current source unit 6 is a constant current source circuit that controls output of high and low currents from the SLAVE 9, the fifth transistor TN1 and the sixth transistor TTN12 are in a micro-conducting or amplifying state, when the SLAVE-Tx signal is the high level signal VDD, the emitter current of the sixth transistor TTN12 is large, which results in a large current of the twelfth resistor RR56, which further results in a large current of the eleventh resistor R2, and the current of the eleventh resistor R2 is the current output by the constant current source circuit to the two-wire cable 7, at this time, the current output by the constant current source unit 6 to the two-wire cable 7 is in a high current state. When the SLAVE-Tx signal is a low level signal 0V, the emitter current of the sixth transistor TTN12 is small, which results in a small current of the twelfth resistor RR56 and further results in a small current of the eleventh resistor R2, and the current of the eleventh resistor R2 is the current output by the constant current source circuit to the two-wire cable 7, and at this time, the current output by the constant current source unit 6 to the two-wire cable 7 is in a low current state.
The circuit controls the generation of high and low currents from the slave 9 and outputs the high and low currents to the master 8 through the two-wire cable 7.
Further, referring to fig. 5, the voltage detection unit 5 includes: a seventh triode TTN10, a fifth zener diode ZD2 and a seventeenth resistor RR52, wherein the collector of the seventh triode TTN10 is connected to the seventeenth resistor RR52, the base of the seventh triode TTN10 is connected to the anode of the fifth zener diode ZD2, and the cathode of the fifth zener diode ZD2 is connected to the two-wire cable 7. The other end of the seventeenth resistor RR52 is connected to a power supply.
Referring to fig. 5, the voltage detection unit 5 further includes: an eighteenth resistor RR11, a nineteenth resistor RR42, a twentieth resistor RR9, a fifth capacitor C2, a sixth capacitor CC2 and a seventh capacitor CC18, wherein one end of the eighteenth resistor RR11 is connected to the anode of the fifth zener diode ZD2, the other end of the eighteenth resistor RR11 is connected to the bases of the nineteenth resistor RR42, the sixth capacitor CC2 and the seventh transistor TTN10, the fifth capacitor C2 is connected to the cathode of the fifth zener diode ZD2, one end of the seventh capacitor CC18 is connected to the collector of the seventh transistor TTN10 and the twentieth resistor RR9, and the other end of the seventh capacitor CC18 is connected to the emitter and the ground of the seventh transistor TTN 10. The other end of the nineteenth resistor RR42 is connected to the other end of the fifth capacitor C2, the other end of the sixth capacitor CC2, and the ground, respectively.
Specifically, the voltage detection unit 5 is a voltage detection circuit of the slave 9. When the voltage between the two wire cables 7 is greater than the second threshold voltage, the fifth zener diode ZD2 is broken down, and the base of the seventh transistor TTN10 is supplied with current through the eighteenth resistor RR11, at this time, the seventh transistor TTN10 is in saturation conduction, the collector voltage of the seventh transistor TTN10 is close to 0V, and the signal SLAVE-Rx output from the SLAVE 9 is 0V. When the voltage between the two wire cables 7 is smaller than the second threshold voltage, the fifth zener diode ZD2 is turned off, the voltage at the two wire cables 7 cannot be transmitted to the base of the seventh transistor TTN10, so that the base current of the seventh transistor TTN10 is small, at this time, the seventh transistor TTN10 is turned off, the collector current of the seventh transistor TTN10 is almost zero, so that the collector voltage of the seventh transistor TTN10 is VDD, and a high level state is output to the SLAVE-Rx through the twentieth resistor RR9, that is, the signal SLAVE-Rx output from the SLAVE 9 is VDD. It can be seen that the output signal SLAVE-Rx varies between 0V and VDD, representing binary information sent by the master 8 to the SLAVE 9.
Further, the communication system, as shown in fig. 3, includes: a power-taking control unit 4 and a DC-DC (Direct Current-Direct Current) unit 3.
And the power taking control unit 4 is used for controlling the path of the DC-DC unit 3 to acquire the input voltage according to the power consumption of the host 8 under the control of the first MCU unit 10.
And the DC-DC unit 3 is used for converting the received voltage signal and current signal into power supply voltage required by the operation of the host machine 8 by the host machine 8.
Specifically, the first MCU unit 10 sends a variable power supply demand in a manner of sending an intelligent power-taking instruction to the slave 9 according to the power consumption requirement of the host 8, and the power-taking control unit 4 controls the path of the input voltage of the DC-DC unit 3, so that the DC-DC unit 3 outputs a variable power supply, thereby achieving an energy-saving effect.
Further, the port pin 3 of the bridge rectifier circuit D1 is also connected to the power-taking control unit 4.
Further, as shown in fig. 4, the power-taking control unit 4 includes: an eighth triode T22, a ninth triode T7, a thirteenth diode T21, an eleventh triode T5, a twelfth triode T8, a twenty-first resistor RT37, a twenty-second resistor RT34, a twenty-third resistor RT36, a twenty-fourth resistor RT35, a twenty-fifth resistor RT33, a twenty-sixth resistor RT30, a twenty-seventh resistor RT31, a twenty-eighth resistor RT32, a twenty-ninth resistor RT38 and a thirty resistor RT39, an emitter of the eighth triode T22 is connected with one end of the twenty-first resistor RT37, a base of the eighth triode T22 is connected with the other end of the twenty-first resistor RT37 and one end of the twenty-second resistor RT34 respectively, a collector of the eighth triode T22 is connected with one end of the twenty-fifth resistor RT33, a collector of the ninth triode T7 is connected with the other end of the twenty-second resistor RT34, a base of the ninth triode T7 is connected with the twenty-third resistor RT36, an emitter of the ninth triode T7 is connected with the fourth resistor RT35, the base of a thirteenth polar tube T21 is connected with one end of a twenty-sixth resistor RT30, the other end of the twenty-sixth resistor RT30 is respectively connected with the other end of a twenty-fifth resistor RT33 and the collector of an eleventh triode T5, the emitter of the eleventh triode T5 is connected with a twenty-seventh resistor RT31, the base of the eleventh triode T5 is connected with one end of a twenty-eighth resistor RT32, the other end of the twenty-eighth resistor RT32 is respectively connected with the collectors of a twenty-ninth resistor RT38 and a twelfth polar tube T8, the base of the twelfth polar tube T8 is connected with a thirty-th resistor RT39, and the emitter of the twelfth polar tube T8 is connected with the ground terminal. The other end of the twenty-third resistor RT36 is connected to the first MCU unit 10.
Further, the DC-DC unit 3 is a power-taking circuit of the host 8, and the power-taking circuit is formed by a DC-DC chip circuit, and realizes a function of taking power from the two-wire cable 7 by the host 8.
It should be noted that the DC-DC chip circuit in the DC-DC unit 3 is a circuit existing in the prior art, and is not described herein again.
The input of the DC-DC unit 3 has two paths, wherein, in one path, the output current of the slave 9 flows to the host 8 through the two-wire cable 7, flows into the port pin 3 of the bridge rectifier circuit D1, flows into the DC-DC input circuit through the first triode T4 or the first zener diode DZ1, and flows into the DC-DC input circuit through the thirteenth diode T21 in the power control unit 4; secondly, the output current of the slave 9 flows to the host 8 through the two-wire cable 7, flows into the port pin 3 of the bridge rectifier circuit D1, and directly flows into the DC-DC input circuit through the eighth triode T22 in the power-taking control unit 4. The current flows to the ground after passing through the DC-DC circuit, then flows out from the terminal pin 4 which flows back to the bridge rectifier circuit D1 through the sampling resistor RT13, and flows back to the slave 9 through the two-wire cable 7, and the circuit path of the series circuit is formed. Since almost all of the current flows through the DC-DC circuit, the DC-DC circuit draws maximum power from the series circuit, and the DC-DC output provides the power for operation of the main machine 8.
In the power-taking control unit 4, the base of the ninth triode T7 is connected to the first MCU unit 10 through the thirteenth resistor RT 36. At this time, when the control signal POWER-CNTR sent by the first MCU unit 10 to the base of the ninth transistor T7 is a high level signal, the ninth transistor T7 is operated in an amplification state, and the collector current of the ninth transistor T7 can maintain the base current required for the eighth transistor T22 to be in saturation conduction.
At this time, the output current of the slave 9 flows to the host 8 through the two-wire cable 7, flows into the port pin 3 of the bridge rectifier circuit D1, and directly flows into the DC-DC input circuit through the eighth transistor T22 in the power-taking control unit 4, and the DC-DC unit 3 can obtain the maximum power from the two-wire cable 7. When the POWER-CNTR signal sent by the first MCU unit 10 to the base of the ninth transistor T7 is a low level signal, the eleventh transistor T5 is operated in an amplification state, and the collector current of the eleventh transistor T5 can maintain the base current required for the thirteenth transistor T21 to be in saturation conduction, at this time, the output current of the slave 9 flows to the host 8 through the two-wire cable 7, flows into the port pin 3 of the bridge rectifier circuit D1, flows into the DC-DC input circuit through the first transistor T4 or the first zener diode DZ1, and flows into the DC-DC input circuit through the thirteenth transistor T21 in the POWER-taking control unit 4, and at this time, the POWER of the POWER source obtained by the DC-DC unit 3 from the two-wire cable 7 is variable but not maximum.
Further, the host 8, as the party for actively sending out information in the two-party communication, uses the CN1 interface as the communication connection port of the host 8. The slave 9, as one side of the two-side communication response, the power on the communication line is provided by VEE, and the interface CN2 is used as the communication connection port of the slave 9.
In this way, in the present application, the master and the slave are connected by a two-wire cable, the master sends a voltage signal to the slave, the slave sends a current signal to the master, the second MCU unit in the slave converts the received voltage signal into a binary signal to perform a corresponding communication operation, and the first MCU unit in the master converts the received current signal into a binary signal to perform a corresponding communication operation. Because the current signal has stronger interference resistance to the outside, the communication circuit has stronger interference resistance and longer communication distance, the working accuracy of the communication circuit is improved, and the user experience is improved. And the host can send variable power supply requirements to the slave according to the actual power consumption of the host, so that energy can be saved.
Furthermore, the slave computer provides a power supply with variable power for the host computer according to the request of the host computer, thereby ensuring that the energy is saved to the maximum extent.
The application provides electrical equipment, which comprises the communication system in the embodiment.
Further, the electrical equipment may be heating and ventilation equipment. The heating and ventilation equipment comprises: the heating, ventilation and air conditioning are integrated and called as heating ventilation air conditioning. The central air conditioner is characterized by creating a comfortable indoor environment. The communication system is applied to the heating and ventilation equipment, so that the communication between the host and the slave of the heating and ventilation equipment can be completed through the voltage signal and the current signal, the anti-interference performance of the communication of the heating and ventilation equipment is improved, the variable power supply requirement can be sent to the slave according to the actual power consumption requirement of the host of the heating and ventilation equipment, and the energy can be saved.
In this way, in the present application, the master and the slave are connected by a two-wire cable, the master sends a voltage signal to the slave, the slave sends a current signal to the master, the second MCU unit in the slave converts the received voltage signal into a binary signal to perform a corresponding communication operation, and the first MCU unit in the master converts the received current signal into a binary signal to perform a corresponding communication operation. Because the current signal has stronger interference resistance to the outside, the communication circuit has stronger interference resistance and longer communication distance, and improves the working accuracy of the communication circuit so as to improve the user experience. And the host can send variable power supply requirements to the slave according to the actual power consumption of the host, so that energy can be saved.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (12)
1. A communication system is characterized by comprising a host and a slave, wherein the host and the slave are connected through a two-wire cable, the host comprises a first MCU unit, a constant voltage source unit and a current detection unit, and the slave comprises a second MCU unit, a constant current source unit and a voltage detection unit;
the constant voltage source unit is used for generating and sending a voltage signal to the slave;
the constant current source unit is used for generating and sending a current signal to the host;
the current detection unit is used for detecting the current signal, converting the current signal into a binary state signal and sending the binary state signal to the first MCU unit;
the voltage detection unit is used for detecting the voltage signal, converting the voltage signal into a binary state signal and sending the binary state signal to the second MCU unit;
the first MCU unit is used for converting a binary state signal expressed by the current signal into a binary signal;
and the second MCU unit is used for converting the binary state signal expressed by the voltage signal into a binary signal.
2. The communication system according to claim 1, wherein the constant voltage source unit comprises: the first triode, the first voltage-stabilizing diode and the second voltage-stabilizing diode, the emitting electrode of the first triode is connected with the two-wire cable and the negative electrode of the first voltage-stabilizing diode respectively, the collecting electrode of the first triode is connected with the positive electrode of the first voltage-stabilizing diode and the negative electrode of the second voltage-stabilizing diode respectively, and the positive electrode of the second voltage-stabilizing diode is connected with the grounding terminal.
3. The communication system of claim 2, wherein the constant voltage source unit further comprises: a second triode, a third triode, a fourth triode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a first capacitor, wherein an emitting electrode of the second triode is respectively connected with one end of the first resistor, one end of the second resistor and one end of the first capacitor, a collecting electrode of the second triode is respectively connected with the other end of the second resistor and one end of the third resistor, a base electrode of the second triode is respectively connected with the other end of the first resistor and a collecting electrode of the third triode, an emitting electrode of the third triode is connected with one end of the fourth resistor, a base electrode of the third triode is connected with a negative electrode of the second voltage stabilizing diode, a collecting electrode of the fourth triode is connected with the other end of the third resistor, and a base electrode of the fourth triode is respectively connected with the other end of the fourth resistor and the first MCU unit, and the emitter of the fourth triode is connected with one end of the fifth resistor, the other end of the fifth resistor is connected with the grounding end, and the other end of the first capacitor is connected with the base of the first triode.
4. The communication system according to claim 1, wherein the current detection unit comprises: the sampling circuit comprises a comparator, a sampling resistor, a first threshold resistor, a second threshold resistor and a threshold adjusting resistor, wherein the in-phase input end of the comparator is connected with the threshold adjusting resistor, the other end of the threshold adjusting resistor is connected with the sampling resistor, the other end of the sampling resistor is connected with a grounding end, the reverse phase input end of the comparator is respectively connected with the first threshold resistor and the second threshold resistor, and the output end of the comparator is connected with a first MCU unit.
5. The communication system of claim 4, wherein the current detection unit further comprises: a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a second capacitor, a third capacitor and a fourth capacitor, wherein one end of the sixth resistor is connected to the first MCU, the other end of the sixth resistor is connected to the output end of the comparator, one end of the seventh resistor and one end of the eighth resistor, the other end of the seventh resistor is connected to the first threshold resistor and the power end, the other end of the eighth resistor is connected to the ground terminal, the ninth resistor is connected to the power end, the other end of the ninth resistor is connected to the non-inverting input end of the comparator and one end of the third capacitor, the other end of the third capacitor is connected to the ground terminal, the second capacitor is connected to the power end of the comparator, the other end of the second capacitor is connected to the ground terminal, and the fourth capacitor is connected to the second threshold resistor and the inverting input end of the comparator, the other end of the fourth capacitor is connected with a grounding end, and the other end of the second threshold resistor is connected with the grounding end.
6. The communication system according to claim 1, wherein the constant current source unit comprises: the emitter of the fifth triode is connected with the eleventh resistor, the base of the fifth triode is respectively connected with the twelfth resistor and the collector of the sixth triode, the emitter of the sixth triode is connected with the thirteenth resistor, and the base of the sixth triode is respectively connected with the fourteenth resistor and the fifteenth resistor.
7. The communication system according to claim 6, wherein the constant current source unit further comprises: the high-voltage switch comprises a third diode, a fourth diode and a sixteenth resistor, wherein one end of the sixteenth resistor is connected with the negative electrode of the third diode and the positive electrode of the fourth diode respectively, the other end of the sixteenth resistor is connected with the collector electrode of the fifth triode, the positive electrode of the third diode is connected with the thirteenth resistor and the grounding end respectively, and the negative electrode of the fourth diode is connected with the other end of the eleventh resistor and the other end of the twelfth resistor respectively.
8. The communication system of claim 1, wherein the voltage detection unit comprises: the collector of the seventh triode is connected with the seventeenth resistor, and the negative electrode of the fifth voltage-stabilizing diode is connected with the two-wire cable.
9. The communication system of claim 8, wherein the voltage detection unit further comprises: the high-voltage power supply comprises an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a fifth capacitor, a sixth capacitor and a seventh capacitor, wherein one end of the eighteenth resistor is connected with the anode of the fifth voltage stabilizing diode, the other end of the eighteenth resistor is respectively connected with the nineteenth resistor, the sixth capacitor and the base electrode of the seventh triode, the fifth capacitor is connected with the cathode of the fifth voltage stabilizing diode, one end of the seventh capacitor is respectively connected with the collector electrode of the seventh triode and the twentieth resistor, the other end of the seventh capacitor is respectively connected with the emitter electrode and the grounding terminal of the seventh triode, and the other end of the nineteenth resistor is respectively connected with the other end of the fifth capacitor, the other end of the sixth capacitor and the grounding terminal.
10. The communication system according to any one of claims 1 to 9, wherein the system further comprises a power-taking control unit and a DC-DC unit,
the power-taking control unit is used for controlling a path of the DC-DC unit to acquire an input voltage according to the power consumption of the host under the control of the first MCU unit;
and the DC-DC unit is used for converting the received voltage signal and current signal into power supply voltage required by the work of the host machine by the host machine.
11. The communication system according to claim 10, wherein the power-taking control unit comprises: an eighth triode, a ninth triode, a thirteenth triode, an eleventh triode, a twelfth triode, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor and a thirty-third resistor, wherein an emitter of the eighth triode is connected with one end of the twenty-first resistor, a base of the eighth triode is respectively connected with the other end of the twenty-first resistor and one end of the twenty-second resistor, a collector of the eighth triode is connected with one end of the twenty-fifth resistor, a collector of the ninth triode is connected with the other end of the twenty-second resistor, a base of the ninth triode is connected with the twenty-third resistor, an emitter of the ninth triode is connected with the twenty-fourth resistor, and a base of the thirteenth triode is connected with one end of the twenty-sixth resistor, the twenty-fifth resistor other end and the collecting electrode of eleventh triode are connected respectively to the twenty-sixth resistor other end, twenty-seventh resistor is connected to the projecting pole of eleventh triode, the base of eleventh triode is connected twenty-eighth resistor one end, the twenty-eighth resistor other end is connected respectively the twenty-ninth resistor and the collecting electrode of twelfth triode, the base of twelfth triode is connected the thirty resistance, the earthing terminal is connected to the projecting pole of twelfth triode.
12. An electrical appliance comprising a communication system as claimed in any one of claims 1 to 11.
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| CN202021024574.XU CN212627895U (en) | 2020-06-05 | 2020-06-05 | Communication system and electrical equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230038599A1 (en) * | 2021-08-03 | 2023-02-09 | Potens Semiconductor Corp. | Electromagnetic interference regulator by use of capacitive parameters of field-effect transistor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230038599A1 (en) * | 2021-08-03 | 2023-02-09 | Potens Semiconductor Corp. | Electromagnetic interference regulator by use of capacitive parameters of field-effect transistor |
| US11804834B2 (en) * | 2021-08-03 | 2023-10-31 | Potens Semiconductor Corp. | Electromagnetic interference regulator by use of capacitive parameters of field-effect transistor |
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