Photovoltaic data acquisition device based on broadband PLC communication

Abstract

According to the photovoltaic data acquisition device based on broadband PLC communication provided by the utility model, south data acquisition can be completed only through two power lines, limitation of installation positions is avoided, repeated wiring is avoided, and cost is reduced; comprising a power supply circuit used for converting voltage of an inverter or an external power supply into direct current voltage required by power supply; the PLC coupling circuit is connected with the alternating current power line and is used for isolating and coupling and outputting the PLC signal on the alternating current power line; a PLC transmit-receive circuit connected with the power supply circuit and the PLC coupling circuit and used for receiving the isolated and coupled PLC signals and realizing PLC carrier communication; and the WiFi wireless circuit is connected with the power supply circuit and the PLC transceiver circuit and is used for realizing northbound data wireless interaction.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic data collection, and in particular relates to a photovoltaic data collection device based on broadband PLC communication. Background Art

[0002] The general circuit implementation architecture of existing photovoltaic data acquisition equipment is southbound acquisition, mainly RS485, RS232, Uart TTL, USB and other digital acquisition methods, and northbound data upload methods are mainly CAT-1 (4G), WiFi and other wireless connection methods; and this type of RS485, RS232, Uart TTL, USB and other digital acquisition methods are mainly southbound data acquisition, mainly RS485, RS232, Uart TTL, USB and other digital acquisition methods, and northbound data upload methods are mainly CAT-1 (4G), WiFi and other wireless connection methods. Conventional southbound acquisition interfaces such as TTL and USB all have one thing in common, that is, they not only require data cables corresponding to the interfaces, but also require the acquired devices (such as inverters, micro-inverters, energy storage devices, etc.) to provide two power cables specifically for the photovoltaic data acquisition devices. Therefore, the photovoltaic data acquisition devices are connected to the acquired devices such as inverters, and at least four independent cables including data cables and power cables are required. Therefore, the photovoltaic data acquisition devices are limited by the length of the connecting cables and can only be placed nearby the acquired devices such as inverters, and the application scenarios are also limited. However, the acquired devices such as inverters are located in remote areas, and the CAT-1 (4G) signal strength is generally weak. The WiFi signal is even more difficult to guarantee due to the wall between it and the home router. At the same time, due to the need for power supply and data transmission, separate repeated wiring is required, which increases the cost of wires and labor construction. Utility Model Content

[0003] In view of the above problems, the utility model provides a photovoltaic data acquisition device based on broadband PLC communication, which only needs two power lines to complete southbound data acquisition and is no longer limited by the installation location, thus avoiding repeated wiring and reducing costs.

[0004] The utility model adopts the following technical solution: the utility model is a photovoltaic data acquisition device based on broadband PLC communication, comprising: a power supply circuit, used to convert the voltage of an inverter or an external power supply into a DC voltage required for power supply;

[0005] A PLC coupling circuit, connected to the AC power line, for isolating and coupling the PLC signal on the AC power line for output;

[0006] A PLC transceiver circuit is connected to the power supply circuit and the PLC coupling circuit, and is used to receive the isolated and coupled PLC signal to realize PLC carrier communication;

[0007] The WiFi wireless circuit is connected to the power supply circuit and the PLC transceiver circuit, and is used to realize northbound wireless data interaction.

[0008] Furthermore, the power supply circuit includes an AC / DC power supply module J1, capacitors C1 to C5, inductors L1 and L2, a diode D1, resistors R1 to R8, and DCDC chips U1 and U2. The DCDC chips U1 and U2 use the MP1470 chip model, and the AC / DC power supply module J1 uses the AP12N03-Zero chip model; the 2nd foot of the AC / DC power supply module J1 is connected to one end of the capacitor C1, and the 1st foot of the AC / DC power supply module J1 is connected to the other end of the capacitor C1. The 3rd pin of the AC / DC power module J1 is connected to one end of the capacitors C2 and C3 and the cathode of the diode D1, and the connected connection point is used as the voltage 12V output terminal; the 4th pin of the AC / DC power module J1 is connected to the other end of the capacitors C2 and C3 and the anode of the diode D1 and then grounded; the 3rd pin of the DCDC chip U1 is connected to one end of the resistor R1 and then connected to the voltage 12V, the 6th pin of the DCDC chip U1 is connected to one end of the capacitor C4, and the DCDC chip The 2nd pin of U1 is connected to the other end of the capacitor C4 and one end of the inductor L1. The 4th pin of the DCDC chip U1 is connected to one end of the resistor R2. The other end of the resistor R2 is connected to one end of the resistors R3 and R4. The other end of the resistor R4 is grounded. The resistor R3 is connected to the other end of the inductor L1, and the connection point is used as the voltage 3.3V output terminal. The 3rd pin of the DCDC chip U2 is connected to the voltage 12V. One end of the resistor R5 is connected to the 5th pin of the DCDC chip U2. Pin 1, one end of the resistor R5 is grounded, pin 6 of the DCDC chip U2 is connected to one end of the capacitor C5, pin 2 of the DCDC chip U2 is connected to the other end of the capacitor C5 and one end of the inductor L2, pin 4 of the DCDC chip U2 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to one end of the resistors R7 and R8, and the other end of the resistor R8 is grounded; the resistor R7 is connected to the other end of the inductor L2, and the connection point is used as a voltage 7V output end;

[0009] Further, the PLC coupling circuit includes a transformer T1, a fuse protector F1, a varistor RV1, a capacitor C6, an inductor L3, L4, a TSS protection tube D2, D3, and a TVS tube D4, D5; one end of the fuse protector F1 is connected to the L_IN end of the AC power line, one end of the varistor RV1 is connected to the N_IN end of the AC power line, and one end of the varistor RV1 is also connected to the inductor L4, one end of the TSS protection tube D2, and pin 7 of the transformer T1, the other end of the inductor L4 is connected to pin 1 of the AC / DC power module J1, and the fuse protector F1 is connected to the L_IN end of the AC power line, and the TSS protection tube D2 is connected to the N_IN end of the AC power line. The other end of the protector F1 is connected to the other end of the varistor RV1, the capacitor C6, and one end of the inductor L3. The other end of the inductor L3 is connected to the 2nd pin of the AC / DC power module J1. The other end of the capacitor C6 is connected to the other end of the TSS protection tube D2 and the 8th pin of the transformer T1. The 6th pin of the transformer T1 is connected to the TSS protection tube D3 and one end of the TVS tube D5. The 4th pin of the transformer T1 is connected to the other end of the TSS protection tube D3 and one end of the TVS tube D4. The other ends of the TVS tubes D4 and D5 are connected and grounded.

[0010] Furthermore, the PLC transceiver circuit includes a PLC carrier communication chip U3, the PLC carrier communication chip U3 adopts a model S222T-ISF chip, the 1st and 2nd pins of the LC carrier communication chip U3 are respectively connected to the 4th and 6th pins of the transformer T1, the 4th pin of the LC carrier communication chip U3 is connected to a voltage of 3.3V, and the 17th pin of the LC carrier communication chip U3 is connected to a voltage of 7V;

[0011] Furthermore, the WiFi wireless circuit includes a wireless module U4, resistors R9 and R10, and the wireless module U4 adopts a model LPT270 chip; pin 4 of the wireless module U4 is connected to pin 22 of the PLC carrier communication chip U3, pin 13 of the wireless module U4 is connected to pin 5 of the DCDC chip U2, one end of the resistor R9 is connected to pin 5 of the PLC carrier communication chip U3, one end of the resistor R10 is connected to pin 6 of the PLC carrier communication chip U3, the other ends of the resistors R9 and R10 are respectively connected to pins 5 and 6 of the wireless module U4, and pin 15 of the wireless module U4 is connected to a voltage of 3.3V.

[0012] The beneficial effect of the utility model is that when connected to the collected equipment such as the inverter, it only needs to connect the power circuit and the PLC coupling circuit respectively through two power lines to complete the southbound data collection. That is, the two power lines can not only power the photovoltaic data collection device, but also serve as channels for data transmission, avoiding repeated wiring on site. At the same time, the photovoltaic data collection device is no longer limited by the installation position and can be installed at any interface position of the existing wiring power channel, so that a suitable strong signal position can be selected, so that wireless methods such as CAT-1 (4G) or WiFi can be stably connected to the server, which has good economic use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural block diagram of the utility model;

[0014] Figure 2 It is a circuit schematic diagram of the power supply circuit in the utility model;

[0015] Figure 3 It is a circuit schematic diagram of the PLC coupling circuit in the utility model;

[0016] Figure 4 It is a circuit schematic diagram of the PLC transceiver circuit in the utility model;

[0017] Figure 5 It is a circuit principle diagram of the WiFi wireless circuit in the utility model. DETAILED DESCRIPTION

[0018] like Figure 1 to Figure 5 As shown, the utility model is a photovoltaic data acquisition device based on broadband PLC communication, including: a power supply circuit, used to convert the voltage of an inverter or an external power supply into 7V and 3.3V DC voltages required for power supply; wherein 3.3V is used to power the WiFi wireless circuit and the SoC part in the PLC transceiver circuit; 7V is used to power the high-gain Line driver in the PLC transceiver circuit;

[0019] A PLC coupling circuit is connected to the AC power line and is used to isolate and couple the PLC signal on the AC power line, that is, it can couple the AC side power carrier signal to the PLC transceiver circuit;

[0020] The PLC transceiver circuit is connected to the power supply circuit and the PLC coupling circuit, and is used to receive the isolated and coupled PLC signal to realize PLC carrier communication;

[0021] The WiFi wireless circuit is connected to the power circuit and the PLC transceiver circuit to realize northbound wireless data interaction.

[0022] The power supply circuit includes an AC / DC power supply module J1, capacitors C1~C5, inductors L1, L2, a diode D1, resistors R1~R8, and DCDC chips U1, U2. The DCDC chips U1, U2 use the MP1470 chip model, and the AC / DC power supply module J1 uses the AP12N03-Zero chip model; Pin 2 of the AC / DC power supply module J1 is connected to one end of the capacitor C1, and pin 1 of the AC / DC power supply module J1 is connected to the other end of the capacitor C1; Pin 3 of the AC / DC power supply module J1 is connected to one end of the capacitors C2 and C3 and the negative electrode of the diode D1, and the connected connection point is used as a voltage 12V output terminal; Pin 4 of the AC / DC power supply module J1 is connected to the other end of the capacitors C2 and C3 and the positive electrode of the diode D1 and then grounded; Pin 3 of the DCDC chip U1 is connected to one end of the resistor R1 and then connected to the voltage 12V, and pin 6 of the DCDC chip U1 is connected to one end of the capacitor C4, and the DC Pin 2 of the DC chip U1 is connected to the other end of the capacitor C4 and one end of the inductor L1, pin 4 of the DCDC chip U1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to one end of the resistors R3 and R4, and the other end of the resistor R4 is grounded; resistor R3 is connected to the other end of the inductor L1, and the connected connection point is used as a voltage 3.3V output terminal; pin 3 of the DCDC chip U2 is connected to the voltage 12V, one end of the resistor R5 is connected to pin 5 of the DCDC chip U2, one end of the resistor R5 is grounded, pin 6 of the DCDC chip U2 is connected to one end of the capacitor C5, pin 2 of the DCDC chip U2 is connected to the other end of the capacitor C5 and one end of the inductor L2, pin 4 of the DCDC chip U2 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to one end of the resistors R7 and R8, and the other end of the resistor R8 is grounded; resistor R7 is connected to the other end of the inductor L2, and the connected connection point is used as a voltage 7V output terminal.

[0023] The PLC coupling circuit includes a transformer T1, a fuse protector F1, a varistor RV1, a capacitor C6, an inductor L3, L4, TSS protection tubes D2, D3, and TVS tubes D4, D5; the transformer T1 adopts a 400uH 1:1 signal transformer; one end of the fuse protector F1 is connected to the L_IN end of the AC power line, one end of the varistor RV1 is connected to the N_IN end of the AC power line, and one end of the varistor RV1 is also connected to the inductor L4, one end of the TSS protection tube D2, and the 7th pin of the transformer T1, the other end of the inductor L4 is connected to the 1st pin of the AC / DC power module J1, the other end of the fuse protector F1 is connected to the other end of the varistor RV1, the capacitor C6, and one end of the inductor L3, and the other end of the inductor L3 is connected to the 2nd pin of the AC / DC power module J1. The other end of capacitor C6 is connected to the other end of TSS protection tube D2 and pin 8 of transformer T1, pin 6 of transformer T1 is connected to TSS protection tube D3 and one end of TVS tube D5, pin 4 of transformer T1 is connected to the other end of TSS protection tube D3 and one end of TVS tube D4, and the other ends of TVS tubes D4 and D5 are connected and then grounded; wherein, L_IN and N_IN ends are contacts connected to the AC power grid; L_OUT and N_OUT are signals isolated from L_IN and N_IN ends by inductors L3 and L4, and L_OUT and N_OUT provide ACDC conversion power supply to the system power supply network (that is, the power supply circuit); the function of inductors L3 and L4 is to separate the system power supply network from the PLC coupling signal channel (power grid) to reduce electromagnetic interference.

[0024] The PLC transceiver circuit includes a PLC carrier communication chip U3. The PLC carrier communication chip U3 adopts the model S222T-ISF chip. The 1st and 2nd pins of the LC carrier communication chip U3 correspond to the 4th and 6th pins of the transformer T1 respectively. The 4th pin of the LC carrier communication chip U3 is connected to a voltage of 3.3V, and the 17th pin of the LC carrier communication chip U3 is connected to a voltage of 7V.

[0025] The WiFi wireless circuit includes a wireless module U4, resistors R9 and R10. The wireless module U4 adopts the LPT270 chip. Pin 4 of the wireless module U4 is connected to pin 22 of the PLC carrier communication chip U3, pin 13 of the wireless module U4 is connected to pin 5 of the DCDC chip U2, one end of the resistor R9 is connected to pin 5 of the PLC carrier communication chip U3, one end of the resistor R10 is connected to pin 6 of the PLC carrier communication chip U3, the other ends of the resistors R9 and R10 are connected to pins 5 and 6 of the wireless module U4 respectively, and pin 15 of the wireless module U4 is connected to a voltage of 3.3V.

[0026] The working principle of the utility model is to convert the voltage on the power line of the inverter or external power supply into 12V DC through the AC / DC power module J1, and then convert it into 7V and 3.3V DC voltages required by the system through two independent DCDC chips (U1, U2), of which 3.3V is used to power the SoC part in the WiFi wireless circuit and the PLC transceiver circuit. 7V is used to power the high-gain Line driver (PA) in the PLC transceiver circuit; at the same time, the AC power line first passes through the fuse protector F1 and the varistor RV1, and one branch is introduced into the AC-N and AC-L pins of the AC / DC power module J1 in the power circuit through the inductor L3 and L4 that isolates the PLC signal and the power supply, and the other branch enters the transformer T1 through the capacitor C6 and the TSS protection tube D2. The transformer T1 isolates and couples the PLC signal on the power line, and the PLCP+ and PLCN- pins on the PLC transceiver circuit are connected to the secondary of the transformer T1 in the PLC coupling circuit, and the PLC transceiver circuit is connected to the serial port of the WiFi wireless circuit to realize northbound data interaction.

[0027] In the present invention, only two power lines are needed to connect the photovoltaic data acquisition device and the collected equipment such as the inverter, so as to complete the southbound data acquisition function. The two power lines can not only supply power to the photovoltaic data acquisition device, but also serve as channels for data transmission, thus avoiding repeated wiring on site and reducing wiring costs and on-site construction labor costs. At the same time, the photovoltaic data acquisition device is no longer limited by the installation location, and the photovoltaic data acquisition device based on PLC (power carrier) communication of the present invention can be installed at any interface position of the power channel of the existing wiring, so that a suitable strong signal position can be selected, so that wireless methods such as CAT-1 (4G) or WiFi can be stably connected to the server, thereby improving the stability and reliability of photovoltaic data acquisition. In addition, the present invention realizes a broadband PLC power carrier through a PLC transceiver circuit, and its operating frequency band is <12MHz, avoiding the power supply noise of electrical equipment basically distributed around 100KHZ, and therefore has a good anti-interference ability.

[0028] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0029] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A photovoltaic data acquisition device based on broadband PLC communication, characterized in that: include: A power supply circuit, used for converting the voltage of an inverter or an external power supply into a DC voltage required for power supply; A PLC coupling circuit, connected to the AC power line, for isolating and coupling the PLC signal on the AC power line for output; A PLC transceiver circuit is connected to the power supply circuit and the PLC coupling circuit, and is used to receive the isolated and coupled PLC signal to realize PLC carrier communication; The WiFi wireless circuit is connected to the power supply circuit and the PLC transceiver circuit, and is used to realize northbound wireless data interaction.

2. A photovoltaic data acquisition device based on broadband PLC communication according to claim 1, characterized in that: The power supply circuit includes an AC / DC power supply module J1, capacitors C1-C5, inductors L1, L2, a diode D1, resistors R1-R8, and DCDC chips U1 and U2. The DCDC chips U1 and U2 are MP1470 chips, and the AC / DC power supply module J1 is AP12N03-Zero chip. Pin 2 of the AC / DC power supply module J1 is connected to one end of the capacitor C1, and pin 1 of the AC / DC power supply module J1 is connected to the other end of the capacitor C1. The 3rd pin of the AC / DC power module J1 is connected to one end of the capacitors C2 and C3 and the cathode of the diode D1, and the connected connection point is used as the voltage 12V output terminal; the 4th pin of the AC / DC power module J1 is connected to the other end of the capacitors C2 and C3 and the anode of the diode D1 and then grounded; the 3rd pin of the DCDC chip U1 is connected to one end of the resistor R1 and then connected to the voltage 12V, the 6th pin of the DCDC chip U1 is connected to one end of the capacitor C4, and the Pin 2 is connected to the other end of the capacitor C4 and one end of the inductor L1, pin 4 of the DCDC chip U1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to one end of the resistors R3 and R4, and the other end of the resistor R4 is grounded; the resistor R3 is connected to the other end of the inductor L1, and the connection point is used as the voltage 3.3V output end; pin 3 of the DCDC chip U2 is connected to the voltage 12V, and one end of the resistor R5 is connected to pin 5 of the DCDC chip U2 , one end of the resistor R5 is grounded, pin 6 of the DCDC chip U2 is connected to one end of the capacitor C5, pin 2 of the DCDC chip U2 is connected to the other end of the capacitor C5 and one end of the inductor L2, pin 4 of the DCDC chip U2 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to one end of the resistors R7 and R8, and the other end of the resistor R8 is grounded; the resistor R7 is connected to the other end of the inductor L2, and the connected connection point serves as a voltage 7V output end.

3. A photovoltaic data acquisition device based on broadband PLC communication according to claim 2, characterized in that: The PLC coupling circuit includes a transformer T1, a fuse protector F1, a varistor RV1, a capacitor C6, an inductor L3, L4, a TSS protection tube D2, D3, and a TVS tube D4, D5; one end of the fuse protector F1 is connected to the L_IN end of the AC power line, one end of the varistor RV1 is connected to the N_IN end of the AC power line, and one end of the varistor RV1 is also connected to the inductor L4, one end of the TSS protection tube D2, and the 7th pin of the transformer T1, and the other end of the inductor L4 is connected to the 1st pin of the AC / DC power module J1. The other end of 1 is connected to the other end of the varistor RV1, the capacitor C6, and one end of the inductor L3. The other end of the inductor L3 is connected to pin 2 of the AC / DC power module J1. The other end of the capacitor C6 is connected to the other end of the TSS protection tube D2 and pin 8 of the transformer T1. Pin 6 of the transformer T1 is connected to one end of the TSS protection tube D3 and the TVS tube D5. Pin 4 of the transformer T1 is connected to the other end of the TSS protection tube D3 and one end of the TVS tube D4. The other ends of the TVS tubes D4 and D5 are connected and grounded.

4. A photovoltaic data acquisition device based on broadband PLC communication according to claim 3, characterized in that: The PLC transceiver circuit includes a PLC carrier communication chip U3, which adopts the model S222T-ISF chip. The 1st and 2nd pins of the LC carrier communication chip U3 are respectively connected to the 4th and 6th pins of the transformer T1. The 4th pin of the LC carrier communication chip U3 is connected to the voltage of 3.3V, and the 17th pin of the LC carrier communication chip U3 is connected to the voltage of 7V.

5. A photovoltaic data acquisition device based on broadband PLC communication according to claim 4, characterized in that: The WiFi wireless circuit includes a wireless module U4, resistors R9 and R10. The wireless module U4 adopts a model LPT270 chip; pin 4 of the wireless module U4 is connected to pin 22 of the PLC carrier communication chip U3, pin 13 of the wireless module U4 is connected to pin 5 of the DCDC chip U2, one end of the resistor R9 is connected to pin 5 of the PLC carrier communication chip U3, one end of the resistor R10 is connected to pin 6 of the PLC carrier communication chip U3, the other ends of the resistors R9 and R10 are respectively connected to pins 5 and 6 of the wireless module U4, and pin 15 of the wireless module U4 is connected to a voltage of 3.3V.

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