CN210518322U - Twisted-pair carrier communication circuit - Google Patents
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- CN210518322U CN210518322U CN201922287545.6U CN201922287545U CN210518322U CN 210518322 U CN210518322 U CN 210518322U CN 201922287545 U CN201922287545 U CN 201922287545U CN 210518322 U CN210518322 U CN 210518322U
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Abstract
The utility model relates to the field of electronic technology, concretely relates to twisted pair line carrier communication circuit. The circuit is connected with a communication bus and comprises: a coupling circuit connected with the communication bus; the control demodulation circuit is connected with the coupling circuit and used for receiving the carrier signal of the communication bus; and the transmitting circuit is connected with the coupling circuit, is also connected with the control demodulation circuit and is used for receiving the carrier signal output by the control demodulation circuit, and the coupling circuit carries out data transmission. By using the coupling circuit, the control demodulation circuit and the transmission circuit, wherein the control demodulation circuit outputs a 50kHZ communication carrier and a carrier signal of the control demodulation circuit, circuit elements are reduced, and the circuit is simplified, thereby reducing the power consumption of the circuit.
Description
Technical Field
The utility model relates to the field of electronic technology, concretely relates to twisted pair line carrier communication circuit.
Background
The communication automatic meter reading function is one of important parts of the intelligent electric meter. In the international standard IEC62056-31, a 50kHz carrier based twisted pair communication scheme is specified. The scheme has stronger anti-interference performance, longer transmission distance and communication meter reading scheme with the maximum communication speed of 9600 bps.
Since the carrier signal is modulated by a 50kHz carrier according to the international standard, a 50kHz carrier signal generation circuit is required to be added when designing a twisted pair carrier communication circuit. In the prior art, a twisted pair carrier communication circuit has large power consumption and influences the service life of an ammeter.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a twisted pair carrier communication circuit to reduce the problem of high power consumption of the twisted pair carrier communication circuit.
According to a first aspect, a twisted pair carrier communication circuit, coupled to a communication bus, comprises:
a coupling circuit connected with the communication bus;
the control demodulation circuit is connected with the coupling circuit and used for receiving the carrier signal of the communication bus;
and the transmitting circuit is connected with the coupling circuit, is also connected with the control demodulation circuit and is used for receiving the carrier signal output by the control demodulation circuit, and the coupling circuit carries out data transmission.
By using the coupling circuit, the control demodulation circuit and the transmission circuit, wherein the control demodulation circuit outputs a 50kHZ communication carrier signal, circuit elements are reduced, and the circuit is simplified, thereby reducing the power consumption of the circuit.
With reference to the first aspect, in a first implementation manner of the first aspect, the control demodulation circuit includes: the controller is electrically connected with the bias circuit and the direct current isolation circuit.
With reference to the first aspect, in a second implementation manner of the first aspect, the bias circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor and a fourth resistor; a first input end of the controller is connected with first ends of the first resistor and the second resistor, a second end of the first resistor is connected with a power supply, and a second end of the second resistor is grounded; the first ends of the third resistor and the fourth resistor are connected with the first input end of the controller, the second end of the third resistor is connected with the power supply, and the second end of the fourth resistor is grounded.
With reference to the first aspect, in a third implementation manner of the first aspect, the dc isolation circuit includes a first capacitor connected in series between first ends of the first resistor and the second resistor and first ends of the third resistor and the fourth resistor.
The controller is connected with the bias circuit and the direct-current isolation circuit to ensure that clutter signals in received signals can be eliminated, the bias filter circuit is formed by the bias resistor and the filter capacitor, so that the circuit is ensured to be in a normal working state, and clutter is filtered by adding the first capacitor, and the working stability of the control demodulation circuit is ensured.
With reference to the first aspect, in a fourth implementation manner of the first aspect, the coupling circuit includes:
a first end of the second capacitor is connected with the first input end of the controller, and a second end of the second capacitor is connected with the first end of the coupling element;
a second end of the coupling element is grounded, a third end of the coupling element is connected with a first end of the third capacitor, and a second end of the third capacitor is connected with the communication bus; a fourth end of the coupling element is connected with a first end of the seventh resistor, and a second end of the seventh resistor is connected with the communication bus; the first end of the coupling element is connected with the first end of the fourth capacitor, and the second end of the fourth capacitor is grounded.
A diode having a first end connected to the first end of the coupling element and a second end connected to the second end of the coupling element.
The coupling circuit realizes the transmission of energy and signals by using the coupling element, ensures the normal work of the circuit, realizes impedance transformation and ensures the full utilization of the circuit function. And the accuracy of the transmitted signal is ensured by the combined LC circuit.
With reference to the first aspect, in a fifth implementation manner of the first aspect, the transmission circuit includes:
the modulation circuit comprises a modulator, wherein a first end of the modulator is connected with a first output end of the controller, and a second end of the modulator is connected with a second output end of the controller; the modulation circuit receives a carrier signal for controlling the demodulation circuit, modulates the received carrier signal and transmits the modulated carrier signal to the coupling circuit;
a first end of the switch circuit is connected with an enabling end of the controller, and a second end of the switch circuit is connected with the coupling circuit; the switch circuit is used for receiving the level signal sent by the controller and controlling the modulation circuit to be switched on or switched off.
With reference to the first aspect, in a sixth implementation manner of the first aspect, the modulator further includes a third terminal, a fourth terminal, and a fifth terminal, the third terminal of the modulator is grounded, the fourth terminal of the modulator is connected to the first terminal of the second capacitor, and the fifth terminal of the modulator is connected to the power supply.
With reference to the first aspect, in a seventh implementation manner of the first aspect, the switching circuit includes a first switching tube, a first end of the first switching tube is connected to an enable end of the controller, a second end of the first switching tube is connected to a power supply, and a third end of the first switching tube is connected to first ends of a second switching tube and a third switching tube; a second end of the second switching tube is connected with a third end of the third switching tube, and the third end of the second switching tube is grounded; and the second end of the third switching tube is connected with the second end of the second capacitor.
With reference to the first aspect, in an eighth implementation manner of the first aspect, the transmission circuit includes:
and a first end of the eighth resistor is connected with the third end of the first switching tube, and a second end of the eighth resistor is connected with the second end of the second switching tube or the third end of the third switching tube.
With reference to the first aspect, in a ninth implementation manner of the first aspect, the transmitting circuit further includes:
a fifth capacitor connected in series between the five terminals of the modulator and ground.
The transmitting circuit is used for adjusting the impedance of the modulation signal and the carrier signal output from the controller, so that signal clutter generated by parasitic parameters is eliminated, and the signal quality during signal transmission is ensured.
Drawings
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 embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of a twisted pair carrier communication circuit according to an embodiment of the present invention;
fig. 2 is a structural diagram of a control demodulation circuit of a twisted pair carrier communication circuit according to an embodiment of the present invention;
fig. 3 is a structural diagram of a coupling circuit of a twisted pair carrier communication circuit according to an embodiment of the present invention;
fig. 4 is a structural diagram of a transmitting circuit of a twisted pair carrier communication circuit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of an alternative embodiment of the present invention;
reference numerals:
10-control the demodulation circuit; 20-a coupling circuit; 30-a communication bus; 40-a transmission circuit; u1-controller; r1 — first resistance; r2 — second resistance; r3 — third resistance; r4-fourth resistor; r5-fifth resistor; r6-sixth resistance; c1 — first capacitance; c2 — second capacitance; c3 — third capacitance; c4-fourth capacitance; c5 — fifth capacitance; c6 — bypass capacitance; c7 — seventh capacitance; x1-crystal oscillator; t1-coupling element; r7 — seventh resistor; u2-modulator; q1-first switch tube; q2-second switch tube; q3-third switch tube; r8 — eighth resistance; r9 — ninth resistor; r10 — tenth resistance; r11-pull-up resistor.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
The embodiment of the utility model provides a twisted-pair line carrier communication circuit, as shown in fig. 1, be connected with communication bus 30, include:
a coupling circuit 20 connected to the communication bus 30; the coupling circuit 20 is connected to a communication device as a receiving or transmitting end of a carrier signal, and is used for transmitting the carrier signal, and needs to transmit the signal through the communication bus 30 as a transmission medium.
A control demodulation circuit 10 electrically connected to the coupling circuit 20 for receiving and transmitting the carrier signal of the communication bus 30; the control demodulation circuit 10 receives the carrier signal, judges and processes the carrier signal, and outputs the modulation signal by controlling the demodulation circuit 10, thereby realizing the simplification of the circuit, further reducing the problem of circuit power consumption on the basis of ensuring the basic function of the existing design, and further prolonging the service life of the circuit.
And a transmitting circuit 40 connected to the coupling circuit 20, wherein the transmitting circuit 40 is further connected to the control demodulation circuit 10, and is configured to receive the carrier signal output by the control demodulation circuit 10, and the coupling circuit 20 performs data transmission. The transmitting circuit 40 receives the carrier signal for controlling the demodulating circuit 10, the transmitting circuit 40 modulates the carrier signal and outputs a square wave signal meeting the requirement, and in the modulating process, the transmitting circuit 40 eliminates clutter parameters of the received carrier signal, so that the accuracy of the signal in the transmitting process is ensured.
The carrier signal on the communication bus 30 passes through the coupling circuit 20 and then enters the control demodulation circuit 10, the control demodulation circuit 10 processes the received carrier signal, wherein the control demodulation circuit 10 needs to output a 50kHZ communication carrier signal; the 50kHZ communication carrier signal is sent to the transmitting circuit 40, and the transmitting circuit 40 modulates the 50kHZ communication carrier signal and transmits the modulated signal to the communication bus 30 through the coupling circuit 20 for data communication.
By using the coupling circuit 20, the control demodulation circuit 10, and the transmission circuit 40, wherein the control demodulation circuit 10 outputs a 50kHZ communication carrier signal, the circuit is simplified, and circuit elements are reduced, thereby reducing the power consumption of the circuit.
Specifically, as shown in fig. 2 to 4, the control demodulation circuit 10 includes a controller U1, a comparison circuit, a bias circuit, and a dc isolation circuit. The comparison circuit comprises a fifth resistor R5 and a sixth resistor R6, the bias circuit comprises a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, and the direct-current isolation circuit comprises a first capacitor C1; the first input end 12 of the controller U1 is connected to the first end of the fifth resistor R5 and the first end of the sixth resistor R6, the second end of the fifth resistor R5 is connected to a power supply, and the second end of the sixth resistor R6 is connected to ground; the second input end 11 of the controller U1 is connected to the first end of the first resistor R1 and the first end of the second resistor R2, the second end of the first resistor R1 is connected to a power supply, and the second end of the second resistor R2 is connected to ground; the second input end 11 of the controller U1 is also connected to a first end of the first capacitor C1; the second end of the first capacitor C1 is connected to the first ends of the third resistor R3 and the fourth resistor R4, the second end of the third resistor R3 is connected to the power supply, and the second end of the fourth resistor R4 is connected to the ground.
The first resistor R1 to the fourth resistor R4 form a bias circuit to ensure stable operation of the circuit, the first capacitor C1 is used for isolating direct current signals, only alternating current signals are allowed to pass, and the carrier signals are ensured to be stably input to a comparison (logic judgment) end in the controller U1 for comparison and judgment, so that the accuracy of the input carrier signals is ensured.
In addition, in order to make the circuit work normally, the controller U1 needs to design peripheral circuits to make the controller U1 work normally. For example: A12M/24M/33M clock crystal oscillator X1 is externally connected to pins 2 and 3 of the controller U1 to ensure that the controller U1 works normally, or a seventh capacitor C7 and a pull-up resistor R11 are connected to a reset pin 4 of the controller U1, and a key can be connected for manual reset.
Optionally, a bypass capacitor C6 is connected to a power supply terminal of the controller U1 to prevent interference of the ac signal.
Optionally, resistors are connected to the input terminals 11, 12/output terminal 13 of the controller U1 to ensure that the subsequent circuit can work normally, so as to prevent the circuit from being damaged due to sudden current/voltage changes.
The coupling circuit 20 includes: a second capacitor C2, a first terminal of the second capacitor C2 is connected to the second input terminal of the controller U1, and a second terminal of the second capacitor C2 is connected to the first terminal of the coupling element T1;
a coupling element T1, wherein the second terminal of the coupling element T1 is grounded, the third terminal of the coupling element T1 is connected to the first terminal of the third capacitor C3, and the second terminal of the third capacitor C3 is connected to the communication bus 30; the fourth end of the coupling element T1 is connected to the first end of the seventh resistor R7, and the second end of the seventh resistor R7 is connected to the communication bus 30; the first end of the coupling element T1 is connected with the first end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is grounded;
a diode D1, a first terminal of the diode D1 being connected to a first terminal of the coupling element T1, a second terminal of the diode D1 being connected to a second terminal of the coupling element T1.
The coupling circuit 20, which is composed of the coupling element T1, can be connected with the diode D1 and the resistor and the capacitor, thereby ensuring the transmission of energy and signals. The diode D1 can prevent the damage of the signal current to the post-stage equipment and circuit, and play roles of surge protection and electrostatic protection.
The transmission circuit 40 includes: the modulation circuit comprises a modulator U2, a first end of the modulator U2 is connected with a first output end 13 of the controller U1, a second end of the modulator U2 is connected with a second output end 5 of the controller U1, a third end GND of the modulator U2 is grounded, a fourth end of the modulator U2 is connected with a first end of the second capacitor C2, and a fifth end of the modulator U2 is connected with a power supply; specifically, the modulator U2 receives a carrier signal sent by the controller U1, where the carrier signal is data exchanged through a serial port, and the modulator U2 receives a 50Khz signal and the carrier signal, sends the signal to the modulator U2, and outputs a 50Khz rectangular wave, thereby ensuring normal operation of the circuit, where the modulator U2 may be a tri-state gate, ensuring that "0" or "1" can be transmitted when the circuit is connected, and when the circuit is disconnected, no influence is generated on information on a signal line, and ensuring that the circuit can operate normally.
The switching circuit includes: a first switch tube Q1, a first end of the first switch tube Q1 is connected to the enable end 8 of the controller U1, a second end of the first switch tube Q1 is connected to a power supply, and a third end of the first switch tube Q1 is connected to first ends of a second switch tube Q2 and a third switch tube Q3; a second terminal of the second switching tube Q2 is connected to a third terminal of the third switching tube Q3, and a third terminal of the second switching tube Q2 is grounded; a second terminal of the third switching tube Q3 is connected to a second terminal of the second capacitor C2. The first open tube adjusts impedance through connecting an enabling signal, so that clutter signals generated by parasitic parameters are eliminated, and the second switch tube Q2 and the third switch tube Q3 are combined to form a push-pull circuit, so that static working current of the circuit is improved, output loss of the circuit is reduced, and working efficiency of the circuit is improved.
Preferably, the first switching tube Q1 is a triode, and the second switching tube Q2 and the third switching tube Q3 are MOS tubes.
The switch circuit further includes an eighth resistor R8, a first end of the eighth resistor R8 is connected to the third end of the first switch transistor Q1, a second end of the eighth resistor R8 is connected to the second end of the second switch transistor Q2, or the third end of the third switch transistor Q3.
The modulation circuit further comprises a fifth capacitor C5, and the fifth capacitor C5 is connected between the fifth terminal of the modulator U2 and the ground in series and plays a role in filtering.
The transmitting circuit 40 transmits the received signal, transmits the signal by coupling reception and transmission coupling, and integrally outputs the modulation signal by using the control demodulation circuit 10, thereby simplifying the circuit, ensuring that the circuit can meet the functions of the prior art, reducing elements and further reducing power consumption due to the simplification of the circuit.
Alternatively, the coupling element T1 may be a coupling inductor, and/or a coupling transformer.
Alternatively, the coupling method may be direct coupling, transformer coupling, or the like; for example: the transformer coupling or the capacitance coupling is used, wherein the working point of the next stage is mainly not influenced by the previous stage, the previous stage and the next stage are required to be separated in terms of direct current, and meanwhile, an alternating current signal can be smoothly transmitted from the previous stage to the next stage, so that the quality of the signal is ensured, wherein the transformer coupling is more suitable for large signals or strong signals.
Optionally, the diode D1 includes: an electrostatic protector.
An embodiment of the present invention provides an optional circuit, as shown in fig. 5, including: control and demodulation circuit, signal transmission circuit 40, signal coupling circuit 20.
The control demodulation circuit 10 adopts an intelligent controller U1, and further comprises a comparison part, a bias part and a direct current isolation part, so that the normal operation of the controller U1 is ensured, 50kHz square waves for modulation can be output, and meanwhile, the controller U1 controls the whole circuit. The main chip of the electric energy meter can also control the switch of the whole circuit, so that the requirements of low power consumption and the like are met. And the bias part and the direct current isolation part are used for carrying out bias and direct current isolation on the input signal and inputting the input signal to a comparator pin of the intelligent controller U1, wherein the bias voltage takes an intermediate voltage, such as: R1/R2, the value is 3.3V/2. The signal is demodulated and filtered through the single chip microcomputer, and finally, standard serial port signals are output to all circuits to ensure that all circuits work normally.
Wherein, the output pin of the signal of the control and demodulation circuit is also connected with a transmitting circuit 40; the transmitting circuit 40 is composed of a tristate output gate U2, a capacitor C5, resistors R10, R9 and R8, a triode Q1, and MOS transistors Q2 and Q3. The serial port signal outputs a square wave signal with 50kHz modulation through the U2, and the impedance is adjusted through the output enable signal, so that the clutter signal generated by the parasitic parameter is eliminated, and the output waveform is smoother. In addition, the coupling circuit 20 includes capacitors C2, C3, C4, a TVS tube D1, a coupling transformer T1, a resistor R7, and a connection terminal J1. The transmitted signal is filtered by the C2 to remove the direct current, and the leakage inductance of the C2 and the T1 can also form an LC filter.
Optionally, the controller U1 may be a single chip, an ARM, or other control chips, wherein the controller U1 needs to meet the minimum operating system during normal operation, that is, a clock circuit and a reset circuit are needed.
The reset circuit can be composed of a capacitor and a resistor, and the clock circuit can be composed of a clock crystal oscillator and a capacitor, so that the accuracy of the circuit in operation is ensured.
Alternatively, the sending circuit 40 may be formed by a nand gate logic device, or a nand gate logic device.
Optionally, the sending circuit 40 performs power amplification through a circuit composed of transistors, so as to reduce circuit damage caused by circuit fluctuation and ensure normal operation of the circuit.
The utility model provides an embodiment uses the power supply of 3.3V system, and carrier signal is from control bus 30 interface access coupling circuit 20, and coupling circuit 20 enlargies and keeps apart DC signal and transmits for biasing circuit received carrier signal, and biasing circuit becomes DC signal with AC signal to transmit for controller U1. And a comparison circuit is arranged at the periphery of the controller U1, and an input end of the comparison circuit can be a receiving end of the controller U1, and the receiving end can access 2 comparison signals, wherein one comparison signal is a received carrier signal. One end of the coupling circuit 20 outputting the carrier signal is connected with a pin 11 of the receiving end of the controller, a pin 12 of the receiving end of the controller is connected with a power supply, and circuit control is executed by comparing and judging the signal. After the controller U1 determines that the carrier signal is complete, the controller U1 outputs a 50Khz carrier signal to the modulation circuit of the transmitting circuit 40, the modulation circuit modulates the received signal and transmits the signal to the coupling circuit 20, the enable terminal 8 of the controller U1 further needs to send an instruction to the switch circuit of the transmitting circuit 40, when the enable terminal of the controller U1 outputs a low level, the base of the first switch tube Q1 receives the low level, the third switch tube Q3 outputs a high level, the carrier signal modulated by the modulation circuit can be transmitted to the control bus 30 through the coupling circuit, and the communication circuit is in a signal transmitting state. The signal is amplified through the first switch tube Q1, and impedance adjustment is performed, so that parasitic parameters are eliminated, and stability of the output signal is ensured. When the controller U1 is in the signal receiving state, the enable terminal 8 of the controller U1 outputs a high impedance state to the first switch Q1, then the third switch Q3 outputs a high impedance state, and at this time, no signal is output from the modulation circuit to the coupling circuit, and at this time, the communication circuit is in the signal receiving state.
Optionally, the carrier signal comprises data information.
Optionally, the output of the controller U1 is a serial port signal, and data are communicated with each other by using a serial port.
Alternatively, the consumed quiescent current is reduced by simplifying the circuit, thereby suppressing noise interference.
Optionally, hardware filtering using discrete components in the prior art is changed into software filtering controlled by a single chip microcomputer, the construction of a 50Khz circuit which needs to be designed independently is reduced, the circuit is directly integrated in the controller U1, and a 50Khz carrier signal is directly output through reasonable circuit combination, so that the use of electronic components is reduced, the circuit is simplified, and the power consumption is reduced.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (10)
1. A twisted pair carrier communication circuit coupled to a communication bus, comprising:
a coupling circuit connected with the communication bus;
the control demodulation circuit is connected with the coupling circuit and used for receiving the carrier signal of the communication bus;
and the transmitting circuit is connected with the coupling circuit, is also connected with the control demodulation circuit and is used for receiving the carrier signal output by the control demodulation circuit, and the coupling circuit carries out data transmission.
2. The twisted pair carrier communication circuit of claim 1, wherein the control demodulation circuit comprises: the controller is electrically connected with the bias circuit and the direct current isolation circuit.
3. The twisted pair carrier communication circuit of claim 2, wherein the bias circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor and a fourth resistor; a first input end of the controller is connected with first ends of the first resistor and the second resistor, a second end of the first resistor is connected with a power supply, and a second end of the second resistor is grounded; the first ends of the third resistor and the fourth resistor are connected with the first input end of the controller, the second end of the third resistor is connected with the power supply, and the second end of the fourth resistor is grounded.
4. The twisted pair carrier communication circuit of claim 3, wherein the DC isolation circuit comprises a first capacitor connected in series between first ends of the first and second resistors and first ends of the third and fourth resistors.
5. The twisted pair carrier communication circuit of claim 1, wherein the coupling circuit comprises:
a first end of the second capacitor is connected with a first input end of the controller, and a second end of the second capacitor is connected with a first end of the coupling element;
a second end of the coupling element is grounded, a third end of the coupling element is connected with a first end of a third capacitor, and a second end of the third capacitor is connected with the communication bus; a fourth end of the coupling element is connected with a first end of a seventh resistor, and a second end of the seventh resistor is connected with the communication bus; the first end of the coupling element is connected with the first end of a fourth capacitor, and the second end of the fourth capacitor is grounded;
a diode having a first end connected to the first end of the coupling element and a second end connected to the second end of the coupling element.
6. The twisted pair carrier communication circuit of claim 2, wherein the transmit circuit comprises:
the modulation circuit comprises a modulator, wherein a first end of the modulator is connected with a first output end of the controller, and a second end of the modulator is connected with a second output end of the controller; the modulation circuit receives a carrier signal for controlling the demodulation circuit, modulates the received carrier signal and transmits the modulated carrier signal to the coupling circuit;
a first end of the switch circuit is connected with an enabling end of the controller, and a second end of the switch circuit is connected with the coupling circuit; the switch circuit is used for receiving the level signal sent by the controller and controlling the modulation circuit to be switched on or switched off.
7. The twisted pair carrier communication circuit of claim 6, wherein the modulator further comprises a third terminal, a fourth terminal, and a fifth terminal, wherein the third terminal of the modulator is coupled to ground, wherein the fourth terminal of the modulator is coupled to the first terminal of the second capacitor, and wherein the fifth terminal of the modulator is coupled to a power supply.
8. The twisted-pair carrier communication circuit according to claim 7, wherein the switching circuit comprises a first switching tube, a first end of the first switching tube is connected to the enable end of the controller, a second end of the first switching tube is connected to the power supply, and a third end of the first switching tube is connected to first ends of a second switching tube and a third switching tube; a second end of the second switching tube is connected with a third end of a third switching tube, and the third end of the second switching tube is grounded; and the second end of the third switching tube is connected with the second end of the second capacitor.
9. The twisted pair carrier communication circuit of claim 8, wherein the switching circuit further comprises:
and a first end of the eighth resistor is connected with the third end of the first switching tube, and a second end of the eighth resistor is connected with the second end of the second switching tube or the third end of the third switching tube.
10. The twisted pair carrier communication circuit of claim 7, wherein the modulation circuit further comprises:
a fifth capacitance connected in series between a fifth terminal of the modulator and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922287545.6U CN210518322U (en) | 2019-12-18 | 2019-12-18 | Twisted-pair carrier communication circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922287545.6U CN210518322U (en) | 2019-12-18 | 2019-12-18 | Twisted-pair carrier communication circuit |
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| Publication Number | Publication Date |
|---|---|
| CN210518322U true CN210518322U (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922287545.6U Active CN210518322U (en) | 2019-12-18 | 2019-12-18 | Twisted-pair carrier communication circuit |
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Address after: Zhengtai Instrument Measurement Industrial Park, No.1 Liangce Road, Beibaixiang Town, Leqing City, Wenzhou City, Zhejiang Province, 325603 Patentee after: ZHEJIANG CHINT INSTRUMENT & METER Co.,Ltd. Address before: 325603 Wenzhou Daqiao Industrial Park, Yueqing City, Wenzhou City, Zhejiang Province Patentee before: ZHEJIANG CHINT INSTRUMENT & METER Co.,Ltd. |