CN212413152U - Alternating current power grid communication circuit, electrical equipment and communication system - Google Patents

Abstract

The utility model relates to an alternating current power grid communication circuit, electrical equipment, communication system, include: the system comprises an alternating current input end, a zero-crossing detection circuit, a control circuit and a communication level processing circuit, wherein the alternating current input end is used for connecting an alternating current power grid, the zero-crossing detection circuit is connected with the alternating current input end and used for outputting a zero-crossing detection level when the alternating current input of the alternating current input end is zero, the control circuit is connected with the zero-crossing detection circuit and used for working in a first state or a second state when receiving the zero-crossing detection level, and the communication level processing circuit is; when the control circuit is in a first state, the communication signal is sent to the alternating current input end through the communication level processing circuit; when the control circuit is in the second state, the communication signal input by the alternating current input end is received by the communication level processing circuit. Implement the utility model discloses can simple structure, alternating current network communication is realized to overall arrangement that can be convenient.

Description

Alternating current power grid communication circuit, electrical equipment and communication system

Technical Field

The utility model relates to the field of communication technology, more specifically say, relate to an alternating current power grid communication circuit, electrical equipment, communication system.

Background

Because of the wide range of wiring of the ac power grid, how to transmit communication signals by using the ac power grid is an important issue for research on power communication technology. The power line carrier technology mainly adopted at present refers to a special communication mode for voice or data transmission by using a power line as an information transmission medium. The existing mature power carrier technology has the defects of large circuit modification and high circuit cost.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to the above-mentioned partial technical defect of prior art, provide an alternating current power grid communication circuit, electrical equipment, communication system.

The utility model provides a technical scheme that its technical problem adopted is: constructing an alternating current grid communication circuit comprising:

a zero-crossing detection circuit for connecting the AC input end of the AC power grid, for outputting a zero-crossing detection level when the AC input at the AC input end is zero,

the control circuit is connected with the zero-crossing detection circuit and used for working in a first state or a second state when receiving the zero detection level, and the communication level processing circuit is connected with the alternating current input end and the control circuit;

when the control circuit is in the first state, a communication signal is sent to the alternating current input end through the communication level processing circuit;

and when the control circuit is in the second state, the communication signal input by the alternating current input end is received by the communication level processing circuit.

Preferably, the alternating current input end comprises an L end and an N end, and the communication level processing circuit comprises a communication signal extraction circuit and a frequency selection circuit;

the first end of the communication signal extraction circuit is connected with the N end, and the second end of the communication signal extraction circuit is connected with the L end;

and the first end of the frequency selection circuit is connected with the communication signal extraction circuit, and the second end of the frequency selection circuit is connected with the control circuit.

Preferably, the frequency selection circuit comprises a first capacitor C1, a second capacitor C2 and a resistor R1, a first end of the first capacitor C1 is connected to a first end of the communication signal extraction circuit, a second end of the first capacitor C1 is connected to the control circuit through the resistor R1, a first end of the second capacitor C2 is connected to a second end of the communication signal extraction circuit, and a second end of the second capacitor C2 is grounded; and/or

The communication signal extraction circuit comprises a third capacitor C3, one end of the third capacitor C3 is connected with the N end, and the other end of the third capacitor C3 is connected with the L end.

Preferably, the communication level processing circuit further comprises a first diode D1, the anode of the first diode D1 is grounded, and the cathode of the first diode D1 is connected to the control circuit.

Preferably, the zero-crossing detection circuit includes a photocoupler U1, a second diode D2, and a resistor R3;

the first end of the photoelectric coupler U1 is respectively connected with the cathode of the second diode D2 and the first end of the resistor R3, the second end of the photoelectric coupler U1 is respectively connected with the anode of the second diode D2 and the N end, the third end of the photoelectric coupler U1 is grounded, the fourth end of the photoelectric coupler U1 is connected with the control circuit, and the second end of the resistor R3 is connected with the L end.

Preferably, the control circuit includes a control chip IC1, a second pin of the control chip IC1 is connected to the communication level processing circuit, and a tenth pin of the control chip IC1 is connected to the zero-crossing detection circuit.

The utility model discloses still construct an electrical equipment, include: an alternating current mains communication circuit as claimed in any preceding claim.

The utility model also constructs an AC power grid communication system, which comprises a plurality of electrical equipment as described above, wherein the electrical equipment is connected with the same AC power grid, one electrical equipment is arbitrarily selected to be used as a main equipment, and the other electrical equipment is a slave equipment,

the slave devices receive communication signals transmitted by the master device through the alternating current power grid.

The utility model discloses still construct an alternating current power grid communication method, be applied to as above alternating current power grid communication system, include:

the master device sends a single pulse when detecting that the alternating current input of the master device is zero, and the slave device receives and records the pulse;

continuously performing the above process at least twice to transmit at least two pulses;

the slave device groups the at least two received pulses in a reception order to obtain a communication instruction.

Preferably, the first and second electrodes are formed of a metal,

the master device sending a single pulse when it detects that its ac input is zero, comprising: the master device sends the pulse each time the alternating current input is detected to be zero, or the master device sends the pulse once each time the alternating current input is detected to be zero for a plurality of times.

Preferably, the utility model discloses an alternating current grid communication method still includes:

the master device generates a plurality of pulses according to a preset coding rule;

the slave device receives the plurality of pulses and decodes the pulses according to the preset coding rule to obtain the communication instruction.

Implement the utility model discloses an alternating current network communication circuit, electrical equipment, communication system have following beneficial effect: simple structure, the overall arrangement that can be convenient realizes alternating current network communication.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a logic block diagram of an ac power grid communication circuit according to the present invention;

fig. 2 is a schematic circuit diagram of an embodiment of an ac power network communication circuit according to the present invention;

fig. 3 is a logic block diagram of an embodiment of an electrical device according to the present invention;

fig. 4 is a logic block diagram of an embodiment of an ac power network communication system of the present invention;

fig. 5 is a flowchart of the procedure of an embodiment of the ac power grid communication method of the present invention;

fig. 6 is a flowchart of another embodiment of the ac power grid communication method according to the present invention.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, in a first embodiment of an ac power grid communication circuit 100 of the present invention, the ac power grid communication circuit includes: an alternating current input terminal 110 for connecting an alternating current grid, a zero-crossing detection circuit 130 connected to the alternating current input terminal 110 for outputting a zero-crossing detection level when an alternating current input at the alternating current input terminal 110 is zero, a control circuit 140 connected to the zero-crossing detection circuit 130 for operating in a first state or a second state when receiving the zero-crossing detection level, and a communication level processing circuit 120 connected to the alternating current input terminal 110 and the control circuit 140; when the control circuit 140 is in the first state, the communication level processing circuit 120 sends a communication signal to the ac input terminal 110; when the control circuit 140 is in the second state, the communication signal input from the ac input terminal 110 is received by the communication level processing circuit 120. Specifically, the ac input terminal 110 is used for connecting to an ac power grid, which may be used for receiving ac input from the ac power grid, and the communication signal of the communication circuit is also transmitted to the ac power grid through the ac input terminal 110 to communicate with other devices through the ac power grid. The zero-crossing detection circuit 130 is connected to the ac input terminal 110, and is configured to detect an ac input at the ac input terminal 110 and output a zero-crossing detection level when the ac input at the ac input terminal 110 crosses zero, where zero-crossing detection refers to detection performed by the zero-crossing detection circuit 130 when a waveform transitions from a positive half cycle to a negative half cycle in the ac system. The control circuit 140 is connected to the zero-crossing detection circuit 130, and when receiving the zero-crossing detection level of the zero-crossing detection circuit 130, it triggers its operating state. The working state of the communication system may include a communication signal transmitting state and a communication signal receiving state, that is, the communication system corresponds to a first state and a second state respectively, and a communication level processing circuit 120 is connected between the control circuit 140 and the ac input terminal 110, and is configured to process the communication signal input from the ac input terminal 110 and output the processed communication signal to the control circuit 140 for receiving, or is configured to process the communication signal output by the control circuit 140 and output the processed communication signal to the ac input terminal 110, and output the processed communication signal to the ac power grid through the ac input terminal 110.

Optionally, as shown in fig. 2, the ac input terminal 110 includes an L terminal 111 and an N terminal 112, and the communication level processing circuit 120 includes a communication signal extracting circuit 121 and a frequency selecting circuit 122; a first end of the communication signal extraction circuit 121 is connected to the N terminal 112, and a second end of the communication signal extraction circuit 121 is connected to the L terminal 111; a first terminal of the frequency selecting circuit 122 is connected to the communication signal extracting circuit 121, and a second terminal of the frequency selecting circuit 122 is connected to the control circuit 140. Specifically, when the zero-crossing point occurs, the instantaneous potentials between the L terminal 111 and the N terminal 112 of the ac input terminal 110 are the same, and there is no relative voltage, at this time, a communication signal input through the ac input terminal 110 forms a communication signal voltage on the communication signal extraction circuit 121 connected between the L terminal 111 and the N terminal 112, the communication signal voltage enters the main control circuit after being frequency-selected by the frequency-selecting circuit 122, and meanwhile, a communication signal sent by the main control circuit is processed by the frequency-selecting circuit 122, forms a communication signal voltage on the communication signal extraction circuit 121, is output to the ac power grid through the ac input terminal 110, and can be transmitted to other devices through the ac power grid.

Optionally, the communication signal extraction circuit 121 includes a third capacitor C3, one end of the third capacitor C3 is connected to the N terminal 112, and the other end of the third capacitor C3 is connected to the L terminal 111; the communication signal extraction circuit 121 may be implemented by a voltage dividing resistor, and includes a third capacitor C3, and the third capacitor C3 is connected between the N terminal 112 and the L terminal 111 of the ac input to form a voltage at the L terminal 111 and the N terminal 112.

Optionally, the frequency selecting circuit 122 includes a first capacitor C1, a second capacitor C2, and a resistor R1, a first end of the first capacitor C1 is connected to the first end of the communication signal extracting circuit 121, and a second end of the first capacitor C1 is connected to the control circuit 140 through a resistor R1; a first terminal of the second capacitor C2 is connected to the second terminal of the communication signal extraction circuit 121, and a second terminal of the second capacitor C2 is grounded. Specifically, through the arrangement of the capacitor C1, the capacitor C2, and the resistor R1 and the corresponding values thereof, the frequency of the signal passing through the frequency selection circuit 122 can be controlled to just pass through the communication signal. Meanwhile, the frequency selecting circuit 122 can prevent the ac input of the ac input terminal 110 from entering the control circuit 140 and causing damage to the control circuit 140.

Optionally, the communication level processing circuit 120 further includes a first diode D1, an anode of the first diode D1 is grounded, and a cathode of the first diode D1 is connected to the control circuit 140. Specifically, the diode D1 is used for voltage stabilization and protection, and it can stabilize the communication signal output by the main control circuit to ensure that the voltage of the communication signal output by the main control circuit meets the requirement, and ensure that the communication signal can be recognized and received by other devices after being output through the ac power input terminal. When the current voltage input to the control circuit 140 is too high, the diode D1 diode breaks down in the reverse direction and short-circuits to ground, preventing the control circuit 140 from being damaged by an excessive level output.

Optionally, the zero-crossing detection circuit 130 includes a photocoupler U1, a second diode D2, and a resistor R3; the first end of the photoelectric coupler U1 is connected with the negative electrode of the second diode D2 and the first end of the resistor R3 respectively, the second end of the photoelectric coupler U1 is connected with the positive electrode and the N end 112 of the second diode D2 respectively, the third end of the photoelectric coupler U1 is grounded, the fourth end of the photoelectric coupler U1 is connected with the control circuit 140, and the second end of the resistor R3 is connected with the L end 111. Specifically, the light emitting tube of the photocoupler U1 is connected to the power input end, that is, the positive electrode and the negative electrode of the photocoupler U1 are respectively connected to the L end 111 and the N end 112 of the ac input end 110, when the ac input end 110 performs ac input, the L end 111 and the N end 112 of the ac input end 110 have a voltage difference, the voltage difference enables the light emitting tube of the photocoupler to be turned on to emit light, and triggers the conduction of the photosensitive tube of the photocoupler, the photocoupler U1 connects the third pin and the fourth pin of the photosensitive tube to be turned on and grounded, and the fourth pin outputs a low level, that is, the pin of the control circuit 140 connected to the photocoupler U1. When the ac input between the ac input terminals 110 is zero, that is, there is no voltage at the L terminal 111 and the N terminal 112, there is no voltage between the positive electrode and the negative electrode of the light emitting tube, and the light sensitive tube stops conducting, the third pin and the fourth pin of the photocoupler U1 are disconnected, the fourth pin forms a high level due to the action of the upper resistor R4, and the pin of the control circuit 140 connected to the photocoupler U1 receives the high level, so that it can be understood that the high level output by the fourth pin of the photocoupler U1 is the corresponding zero-crossing detection level.

Optionally, the control circuit 140 includes a control chip IC1, a second pin of the control chip IC1 is connected to the communication level processing circuit 120, and a tenth pin of the control chip IC1 is connected to the zero-crossing detection circuit 130. Specifically, the control circuit 140 includes a control chip IC1 that receives or transmits a communication signal via the second pin connection communication level processing circuit 120 and that is connected to the zero-crossing detection circuit 130 via the tenth pin to receive the zero-crossing detection level. Wherein the control chip IC1 can adopt a device model 96F 8216D.

In addition, as shown in fig. 3, the electrical equipment 10 of the present invention includes the ac power grid communication circuit 100 of any one of the above items, that is, the electrical equipment 10 is provided with the working circuit 200 and the ac power grid communication circuit 100, and the communication signal of the ac power grid communication circuit 100 can be used to control the working circuit 200 of the electrical equipment 10 to perform corresponding actions. By providing the ac power grid communication circuit 100 in the electric appliance 10, the electric appliance 10 can communicate through the ac power grid.

In addition, as shown in fig. 4, the utility model discloses an alternating current power grid communication system, including a plurality of electrical equipment 10 as above, a plurality of electrical equipment 10 all are connected with same alternating current power grid, choose an electrical equipment 10 wantonly to set up to the master, and other electrical equipment 10 are slave units, and the slave unit all receives the communication signal that the master unit passes through alternating current power grid transmission. Specifically, the electrical devices 10 are connected in a networking manner, so that communication between the electrical devices 10 through an alternating current power grid can be formed. The electrical equipment 10 which are independent of each other do not need to be connected with other lines, and communication can be realized only by connecting the electrical equipment with the alternating current of the same power grid, and the communication is realized through the power grid. In the communication process, one electric appliance device 10 is set as a master device at will, and the other devices are slave devices, wherein the master device outputs a communication signal when detecting that the alternating current input passes through zero, and the slave devices receive the communication signal through a power grid, so that the communication between the master device and the slave devices is realized. It can be understood that, in order to ensure the communication effect, the networking of the electrical equipment 10 is the same ac power grid, and the ac power grid is a local power grid as much as possible, for example, the communication between all the electrical equipment 10 in the same household and the same site may be set, and the scene of the local power grid design is closer to the actual requirement.

In addition, as shown in fig. 5, the utility model discloses an ac power grid communication method is applied to ac power grid communication system as above, including:

s1, the master device sends a single pulse when detecting that the alternating current input of the master device is zero, and the slave device receives and records the pulse;

s2, continuously executing the above process at least twice to transmit at least two pulses;

and S3, the slave device groups the received at least two pulses according to the receiving sequence to obtain a communication instruction.

Specifically, in the communication process of the above ac power grid communication system, due to the zero-crossing time limitation, in order to ensure the communication effect, the master device starts to send a single pulse signal when detecting that the ac input has passed zero, the slave device receives the pulse signal and then records, the master device continuously executes the action of S1, so that at least two pulse signals are transmitted between the master device and the slave device, the slave device receives at least two pulses and then groups the pulses according to the receiving sequence, and demodulates the pulse signal according to the preset grouping rule to obtain the communication instruction, so as to perform the corresponding action.

Optionally, the master device sends a single pulse when detecting that its ac input is zero, including: the master device sends a pulse each time it detects that the ac input is zero, or the master device sends a pulse each time it detects that the ac input is zero multiple times. Specifically, the master device may send a single pulse when the ac input is zero, and may send a pulse signal every time it detects that the ac input is zero, and may send a pulse signal at intervals according to a preset rule, that is, send a pulse signal only when it detects that the ac input is zero for a certain number of times.

Optionally, as shown in fig. 6, the communication method of the present invention further includes:

s01, the master device generates a plurality of pulses according to a preset coding rule;

and S02, receiving a plurality of pulses from the equipment, and decoding the pulses according to a preset coding rule to obtain a communication instruction.

Specifically, before the master device sends the pulse signal, the command may be generated into a pulse according to a preset encoding rule, and sent according to the above steps, and after receiving the pulse, the slave device decodes according to the preset encoding to obtain the communication command. The preset encoding rule can be preset according to the requirement so as to achieve the consistency of output and reception.

It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims (8)

1. An alternating current network communication circuit, comprising:

a zero-crossing detection circuit for connecting the AC input end of the AC power grid, for outputting a zero-crossing detection level when the AC input at the AC input end is zero,

the control circuit is connected with the zero-crossing detection circuit and used for working in a first state or a second state when receiving the zero detection level, and the communication level processing circuit is connected with the alternating current input end and the control circuit;

when the control circuit is in the first state, a communication signal is sent to the alternating current input end through the communication level processing circuit;

and when the control circuit is in the second state, the communication signal input by the alternating current input end is received by the communication level processing circuit.

2. The ac power grid communication circuit according to claim 1, wherein the ac input terminal includes an L terminal and an N terminal, and the communication level processing circuit includes a communication signal extraction circuit and a frequency selection circuit;

the first end of the communication signal extraction circuit is connected with the N end, and the second end of the communication signal extraction circuit is connected with the L end;

and the first end of the frequency selection circuit is connected with the communication signal extraction circuit, and the second end of the frequency selection circuit is connected with the control circuit.

3. The alternating current grid communication circuit according to claim 2, wherein the frequency selection circuit comprises a first capacitor C1, a second capacitor C2 and a resistor R1, a first end of the first capacitor C1 is connected to a first end of the communication signal extraction circuit, a second end of the first capacitor C1 is connected to the control circuit through the resistor R1, a first end of the second capacitor C2 is connected to a second end of the communication signal extraction circuit, and a second end of the second capacitor C2 is grounded; and/or

The communication signal extraction circuit comprises a third capacitor C3, one end of the third capacitor C3 is connected with the N end, and the other end of the third capacitor C3 is connected with the L end.

4. The ac power grid communication circuit according to claim 2, wherein the communication level processing circuit further comprises a first diode D1, the anode of the first diode D1 is connected to ground, and the cathode of the first diode D1 is connected to the control circuit.

5. The alternating current grid communication circuit according to claim 2, wherein the zero crossing detection circuit comprises a photocoupler U1, a second diode D2 and a resistor R3;

the first end of the photoelectric coupler U1 is respectively connected with the cathode of the second diode D2 and the first end of the resistor R3, the second end of the photoelectric coupler U1 is respectively connected with the anode of the second diode D2 and the N end, the third end of the photoelectric coupler U1 is grounded, the fourth end of the photoelectric coupler U1 is connected with the control circuit, and the second end of the resistor R3 is connected with the L end.

6. The AC power grid communication circuit according to claim 1, wherein the control circuit comprises a control chip IC1, a second pin of the control chip IC1 is connected to the communication level processing circuit, and a tenth pin of the control chip IC1 is connected to the zero-crossing detection circuit.

7. An electrical device, comprising: an alternating current electrical network communications circuit as claimed in any one of claims 1 to 6.

8. An AC power grid communication system, comprising a plurality of electrical devices according to claim 7, wherein the electrical devices are all connected to the same AC power grid, any one of the electrical devices is set as a master device, and the other electrical devices are slave devices,

the slave devices receive communication signals transmitted by the master device through the alternating current power grid.

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