Photovoltaic data acquisition equipment supporting frequency band switching based on Lora communication

Abstract

The utility model provides a photovoltaic data acquisition device supporting frequency band switching based on Lora communication, which can switch different frequency bands, accords with wireless communication standard requirements of global countries or regions, and reduces cost. The system comprises a power supply circuit, a dual-frequency Lora circuit, a control circuit and an acquisition interface circuit. Wherein the power supply circuit is used for converting voltage of an inverter or an external power supply into direct-current voltage required by power supply; the acquisition interface circuit is connected with acquired equipment and is used for acquiring signal data; the control circuit is connected with the acquisition interface circuit and is used for receiving the signal data output by the acquisition interface circuit so as to realize data communication with the acquired equipment; the dual-frequency Lora circuit comprises a multi-frequency-band transceiver which is connected with the control circuit and is used for switching working frequency bands according to signals output by the control circuit; and the multi-band transceiver adopts a transceiving chip with the model of LR1121, and has two working bands of SUB-1G and 2.4 GHz.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic data collection, in particular to a photovoltaic data collection device based on Lora communication supporting frequency band switching. Background Art

[0002] Existing photovoltaic data acquisition equipment based on Lora technology generally operates in fixed frequency bands of 410-525MHz and 803-930MHz. However, different countries around the world have different requirements for unlicensed ISM operating frequency bands for wireless communications. For example, the available ISM frequency bands in Europe are 868MHz and 2.4GHz, the available ISM frequency bands in North America are 915MHz and 2.4GHz, and the available ISM frequency bands in China are 490MHz and 2.4GHz. Therefore, photovoltaic data acquisition products require multiple product access certifications for different frequency bands, which increases both product preparation costs and product certification costs.

[0003] In summary, the existing photovoltaic data acquisition equipment based on Lora technology has the following shortcomings:

[0004] 1) The working frequency band is single and can only work within a fixed frequency band;

[0005] 2) It does not comply with the wireless communication specifications of countries or regions around the world. Therefore, for products used in different countries or regions, different versions of hardware are required to meet the local ISM frequency band requirements;

[0006] 3) High cost: It involves inventory and production costs, product certification costs, and labor costs for product development, testing, and maintenance. Utility Model Content

[0007] In view of the above problems, the utility model provides a photovoltaic data acquisition device based on Lora communication supporting frequency band switching, which can switch between different frequency bands, meet the wireless communication specifications of countries or regions around the world, and reduce costs.

[0008] The utility model adopts the following technical solution, a photovoltaic data acquisition device based on Lora communication supporting frequency band switching, including: a power supply circuit, a dual-frequency Lora circuit, a control circuit, and an acquisition interface circuit; wherein,

[0009] The power supply circuit is used to convert the voltage of the inverter or the external power supply into the DC voltage required for power supply;

[0010] The acquisition interface circuit is connected to the acquired device and is used to acquire signal data;

[0011] The control circuit is connected to the acquisition interface circuit and is used to receive the signal data output by the acquisition interface circuit to achieve data communication with the acquired device;

[0012] The dual-frequency Lora circuit includes a multi-band transceiver connected to the control circuit and used to switch the working frequency band according to the signal output by the control circuit;

[0013] The multi-band transceiver adopts the model LR1121 transceiver chip, which has two working frequency bands of SUB-1G and 2.4GHz.

[0014] Furthermore, the power supply circuit includes resistors R1~R4, capacitors C1~C6, a converter U1, and an inductor L1. The converter U1 adopts a model TMI3253T power converter; one end of the resistor R2 and the capacitor C1 are connected to pin 3 of the converter U1 and then connected to an input voltage of 5V, the other end of the capacitor C1 is grounded, the other end of the resistor R2 is connected to one end of the resistor R1 and pin 5 of the converter U1, the other end of the resistor R1 is connected to pin 1 of the converter U1 and then grounded, and one end of the capacitor C2 is connected to The 6th pin of the converter U1 is connected, the other end of the capacitor C2 is connected to the 2nd pin of the converter U1 and one end of the inductor L1, the 4th pin of the converter U1 is connected to one end of the resistors R3 and R4 and one end of the capacitor C3, and the other end of the resistor R4 is grounded; the other end of the inductor L1 is connected to the other end of the resistor R3, the other end of the capacitor C3, and one end of the capacitors C4, C5, and C6, and the connection point is used as a DC voltage 3.3V connection terminal; the other ends of the capacitors C4, C5, and C6 are connected and then grounded;

[0015] Furthermore, the dual-frequency Lora circuit also includes resistors R5-R10, capacitors C7-C38, capacitors C42, C43, inductors L2-L13, crystal oscillators Y1, Y2, TVS tubes D1, D2, and a radio frequency switch U2. The multi-band transceiver is a multi-band transceiver U3. The radio frequency switch U2 adopts a single-pole triple-throw radio frequency switch chip model SKY13588-460LF; the crystal oscillator Y1 adopts a 32MHz passive crystal oscillator, and the crystal oscillator Y2 adopts a 32MHz passive crystal oscillator. A 32.768KHz passive crystal oscillator is used; one end of the resistor R6 is connected to the 20th pin of the multi-band transceiver U3, the other end of the resistor R6 is connected to one end of the capacitor C33 and the 4th pin of the RF switch U2, one end of the resistor R7 is connected to the 19th pin of the multi-band transceiver U3, the other end of the resistor R7 is connected to one end of the capacitor C32 and the 5th pin of the RF switch U2, and the other ends of the capacitors C32 and C33 are grounded;

[0016] Furthermore, the control circuit includes a controller U4, capacitors C39, C40, resistors R11, R12, and the controller U4 adopts a model STM32F070 chip; one end of the capacitors C39 and C40 are connected and then connected to the DC voltage 3.3V, the other ends of the capacitors C39 and C40 are connected and then grounded, one end of the resistor R11 is connected to the DC voltage 3.3V, one end of the resistor R12 is grounded, and the other ends of the resistors R11 and R12 are connected and then connected to pin 11 of the controller U4;

[0017] Furthermore, the acquisition interface circuit includes a transceiver U5, resistors R13 to R20, a capacitor C41, a transistor Q1, and a TVS tube D3; the transceiver U5 adopts a model TP8485E-SR transceiver chip; one end of the resistor R15 is connected to pin 12 of the controller U4, pin 1 of the transceiver U5 is connected to pin 13 of the controller U4, the other end of the resistor R15 is connected to the base of the transistor Q1, one end of the resistor R14 is connected to the DC voltage 3.3V, the other end of the resistor R14 is connected to the collector of the transistor Q1, and pins 2 and 3 of the transceiver U5, and pin 4 of the transceiver U5 is connected to the resistor R 13 is then grounded, the 8th pin of the transceiver U5 is connected to one end of the capacitor C41 and then connected to the DC voltage 3.3V, the other end of the capacitor C41 is grounded, the 6th pin of the transceiver U5 is connected to one end of the resistors R16, R17, and R19, the 7th pin of the transceiver U5 is connected to the other end of the resistor R17 and one end of the resistors R18 and R20, the other end of the resistor R16 is connected to the DC voltage 3.3V, the other end of the resistor R18 is grounded, the other end of the resistor R19 is connected to the 2nd pin of the TVS tube D3, the other end of the resistor R20 is connected to the 1st pin of the TVS tube D3, and the 3rd pin of the TVS tube D3 is grounded.

[0018] The beneficial effect of the utility model is that, by setting a power supply circuit, a dual-frequency Lora circuit, a control circuit, and an acquisition interface circuit, and the dual-frequency Lora circuit includes a model LR1121 transceiver chip, which has two working frequency bands of SUB-1G and 2.4GHz. After the control circuit outputs the corresponding signal, the two working frequency bands of SUB-1G and 2.4GHz can be switched accordingly according to the situation, so that only one hardware version is needed to meet the wireless communication specifications of countries or regions around the world, reducing costs and having good economic use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural block diagram of the utility model;

[0020] Figure 2It is a circuit schematic diagram of the power supply circuit in the utility model;

[0021] Figure 3 It is a circuit schematic diagram of the dual-frequency Lora circuit in the utility model;

[0022] Figure 4 It is a circuit schematic diagram of the control circuit in the utility model;

[0023] Figure 5 It is a circuit principle diagram of the acquisition interface circuit in the utility model. DETAILED DESCRIPTION

[0024] like Figure 1 to Figure 5 As shown, the utility model is a photovoltaic data acquisition device based on Lora communication supporting frequency band switching, including: a power supply circuit, a dual-frequency Lora circuit, a control circuit, and an acquisition interface circuit; wherein,

[0025] A power supply circuit, used for converting the voltage of the inverter or external power supply into the 3.3V DC voltage required for power supply;

[0026] A collection interface circuit is connected to a collected device (such as an inverter) to collect signal data;

[0027] The control circuit is connected to the acquisition interface circuit and is used to receive the signal data output by the acquisition interface circuit to realize data communication with the acquired device;

[0028] The dual-frequency Lora circuit includes a multi-band transceiver connected to the control circuit and used to switch the working frequency band according to the signal output by the control circuit;

[0029] The multi-band transceiver uses the LR1121 transceiver chip, which has two operating frequency bands: SUB-1G and 2.4GHz. Specifically, LR1121 is an ultra-low power, long-distance LORA transceiver that supports terrestrial ISM band communications in the 150-960MHz (sub-1GHz) and global 2.4GHz spectrum. LR1121 complies with the physical layer requirements of the LoRaWAN specification released by the LoRa Alliance, and is highly configurable to meet different application requirements and proprietary protocols. The transceiver is suitable for systems that comply with radio standards, including but not limited to ETSI EN 300 220, FCC CFR 47Part 15, ARIB and Chinese regulatory requirements.

[0030] The power supply circuit includes resistors R1 to R4, capacitors C1 to C6, a converter U1, and an inductor L1. The converter U1 adopts a model TMI3253T power converter; one end of the resistor R2 and the capacitor C1 is connected to the 3rd pin of the converter U1 and then connected to the input voltage 5V. The power supply circuit in the utility model can allow 4.5V to 18V power input. The 5V input voltage is used in this embodiment; the other end of the capacitor C1 is grounded, the other end of the resistor R2 is connected to one end of the resistor R1 and the 5th pin of the converter U1, and the other end of the resistor R1 is connected to the converter U1 Pin 1 of the converter U1 is connected to ground, one end of the capacitor C2 is connected to pin 6 of the converter U1, the other end of the capacitor C2 is connected to pin 2 of the converter U1 and one end of the inductor L1, pin 4 of the converter U1 is connected to one end of the resistors R3 and R4 and one end of the capacitor C3, and the other end of the resistor R4 is grounded; the other end of the inductor L1 is connected to the other end of the resistor R3, the other end of the capacitor C3, and one end of the capacitors C4, C5, and C6, and the connection point serves as a DC voltage 3.3V connection terminal; the other ends of the capacitors C4, C5, and C6 are connected and then grounded.

[0031] The dual-band Lora circuit also includes resistors R5-R10, capacitors C7-C38, capacitors C42, C43, inductors L2-L13, crystal oscillators Y1, Y2, TVS tubes D1, D2, and RF switch U2. The multi-band transceiver is used as the multi-band transceiver U3. The RF switch U2 adopts the single-pole triple-throw RF switch chip model SKY13588-460LF. The function of the RF switch U2 is mainly to realize the time-sharing switching of the RF transceiver of the SUB-1G RF antenna port. Its conduction logic is connected by the 4th and 5th pins of the RF switch U2 to the other end of the resistors R6 and R7, which is equivalent to being controlled by the 19th and 20th pins of the multi-band transceiver U3; the crystal oscillator Y1 adopts a 32MHz passive crystal oscillator, and the crystal oscillator Y2 adopts a 32.768KHz passive crystal oscillator; one end of the resistor R6 is connected to the 20th pin of the multi-band transceiver U3. The other end of the resistor R6 is connected to one end of the capacitor C33 and the 4th pin of the RF switch U2, one end of the resistor R7 is connected to the 19th pin of the multi-band transceiver U3, the other end of the resistor R7 is connected to one end of the capacitor C32 and the 5th pin of the RF switch U2, and the other ends of the capacitors C32 and C33 are grounded; wherein, the resistors, capacitors, and inductors led out from the 32nd, 31st, 30th, and 29th pins of the multi-band transceiver U3 constitute the harmonic filter and Rx filter of the SUB-1G band; the resistors, capacitors, and inductors led out from the 26th pin of the multi-band transceiver U3 constitute the harmonic filter and Rx filter of the 2.4G band; the 2nd and 15th pins of the multi-band transceiver U3 are power input pins, and the power circuit provides 3.3V to connect these two pins; one end of the resistor R10 is connected to the 25th pin of the controller U4.

[0032] The control circuit includes a controller U4, capacitors C39, C40, resistors R11, R12, and the controller U4 adopts the STM32F070 chip; one ends of the capacitors C39 and C40 are connected and then connected to a DC voltage of 3.3V, the other ends of the capacitors C39 and C40 are connected and then grounded, one end of the resistor R11 is connected to a DC voltage of 3.3V, one end of the resistor R12 is grounded, and the other ends of the resistors R11 and R12 are connected and then connected to pin 11 of the controller U4; pins 14 to 17 of the controller U4 are respectively connected to pins 24, 23, 21, and 22 of the multi-band transceiver U3, so that data interaction can be performed.

[0033] The acquisition interface circuit includes a transceiver U5, resistors R13 to R20, a capacitor C41, a transistor Q1, and a TVS tube D3; the transceiver U5 adopts a transceiver chip model TP8485E-SR; one end of the resistor R15 is connected to the 12th pin of the controller U4, the 1st pin of the transceiver U5 is connected to the 13th pin of the controller U4, the other end of the resistor R15 is connected to the base of the transistor Q1, one end of the resistor R14 is connected to a DC voltage of 3.3V, the other end of the resistor R14 is connected to the collector of the transistor Q1, and the 2nd and 3rd pins of the transceiver U5, and the 4th pin of the transceiver U5 is connected to the resistor R 13 is then grounded, the 8th pin of the transceiver U5 is connected to one end of the capacitor C41 and then to a DC voltage of 3.3V, the other end of the capacitor C41 is grounded, the 6th pin of the transceiver U5 is connected to one end of the resistors R16, R17, and R19, the 7th pin of the transceiver U5 is connected to the other end of the resistor R17 and one end of the resistors R18 and R20, the other end of the resistor R16 is connected to a DC voltage of 3.3V, the other end of the resistor R18 is grounded, the other end of the resistor R19 is connected to the 2nd pin of the TVS tube D3, the other end of the resistor R20 is connected to the 1st pin of the TVS tube D3, and the 3rd pin of the TVS tube D3 is grounded.

[0034] The utility model can realize switching between SUB-1GHz and 2.4GHz frequency bands in one piece of hardware, and is suitable for multi-scenario applications. Specifically, the globally common ISM license-free frequency band 2.4GHz is used as the main working frequency band, and SUB-1GHz is used as the backup working frequency band, thereby reducing the stocking and production costs of the hardware of the same product, and reducing the certification costs. Since 2.4GHz is a globally common license-free ISM working frequency band, only one hardware version is needed to meet the wireless communication specifications of countries or regions around the world. In summary, for products used in different countries or regions, only one version of hardware is needed to meet the local ISM frequency band requirements, that is, the main working frequency band adopts the globally common ISM license-free frequency band 2.4GHz, and the auxiliary working frequency band can adopt SUB-1G, so that it can meet the certification requirements of various countries, and can also use sub-1G to achieve longer-distance communication under specific conditions, and can avoid redundant stocking and production costs for products of different frequency bands, product certification costs, and labor costs for product development, testing and maintenance.

[0035] Figure 3 The ANT_LR112X end is used as the RF (SUB-1G) radio frequency SMA interface; the ANT_WIFI end is used as the 2.4G radio frequency SMA interface; the ANT_LR112X end and the ANT_WIFI end are used to connect the antennas of the corresponding frequency bands respectively;

[0036] Figure 5 The RS485-A and RS485-B terminals in the module are used as signal interfaces to connect to the inverter and other collected devices.

[0037] 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.

[0038] 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 Lora communication supporting frequency band switching, characterized in that: include: Power supply circuit, dual-frequency Lora circuit, control circuit, acquisition interface circuit; among them, The power supply circuit is used to convert the voltage of the inverter or the external power supply into the DC voltage required for power supply; The acquisition interface circuit is connected to the acquired device and is used to acquire signal data; The control circuit is connected to the acquisition interface circuit and is used to receive the signal data output by the acquisition interface circuit to achieve data communication with the acquired device; The dual-frequency Lora circuit includes a multi-band transceiver connected to the control circuit and used to switch the working frequency band according to the signal output by the control circuit; The multi-band transceiver adopts the model LR1121 transceiver chip, which has two working frequency bands of SUB-1G and 2.4GHz.

2. A photovoltaic data acquisition device based on Lora communication and supporting frequency band switching according to claim 1, characterized in that: The power supply circuit includes resistors R1-R4, capacitors C1-C6, a converter U1, and an inductor L1. The converter U1 adopts a model TMI3253T power converter; one end of the resistor R2 and the capacitor C1 are connected to the 3rd pin of the converter U1 and then connected to the input voltage 5V, the other end of the capacitor C1 is grounded, the other end of the resistor R2 is connected to one end of the resistor R1 and the 5th pin of the converter U1, the other end of the resistor R1 is connected to the 1st pin of the converter U1 and then grounded, one end of the capacitor C2 is connected to the converter The 6th pin of the converter U1 is connected, the other end of the capacitor C2 is connected to the 2nd pin of the converter U1 and one end of the inductor L1, the 4th pin of the converter U1 is connected to one end of the resistors R3 and R4 and one end of the capacitor C3, and the other end of the resistor R4 is grounded; the other end of the inductor L1 is connected to the other end of the resistor R3, the other end of the capacitor C3, and one end of the capacitors C4, C5, and C6, and the connection point serves as a DC voltage 3.3V connection terminal; the other ends of the capacitors C4, C5, and C6 are connected and then grounded.

3. A photovoltaic data acquisition device based on Lora communication and supporting frequency band switching according to claim 2, characterized in that: The dual-frequency Lora circuit also includes resistors R5-R10, capacitors C7-C38, capacitors C42, C43, inductors L2-L13, crystal oscillators Y1, Y2, TVS tubes D1, D2, and a radio frequency switch U2. The multi-band transceiver is a multi-band transceiver U3. The radio frequency switch U2 adopts a single-pole triple-throw radio frequency switch chip model SKY13588-460LF; the crystal oscillator Y1 adopts a 32MHz passive crystal oscillator, and the crystal oscillator Y2 adopts a 3 2.768KHz passive crystal oscillator; one end of the resistor R6 is connected to pin 20 of the multi-band transceiver U3, the other end of the resistor R6 is connected to one end of the capacitor C33 and pin 4 of the RF switch U2, one end of the resistor R7 is connected to pin 19 of the multi-band transceiver U3, the other end of the resistor R7 is connected to one end of the capacitor C32 and pin 5 of the RF switch U2, and the other ends of the capacitors C32 and C33 are grounded.

4. A photovoltaic data acquisition device based on Lora communication and supporting frequency band switching according to claim 3, characterized in that: The control circuit includes a controller U4, capacitors C39, C40, resistors R11, R12, and the controller U4 adopts the STM32F070 chip; one ends of the capacitors C39 and C40 are connected and then connected to the DC voltage 3.3V, the other ends of the capacitors C39 and C40 are connected and then grounded, one end of the resistor R11 is connected to the DC voltage 3.3V, one end of the resistor R12 is grounded, and the other ends of the resistors R11 and R12 are connected and then connected to pin 11 of the controller U4.

5. A photovoltaic data acquisition device based on Lora communication and supporting frequency band switching according to claim 4, characterized in that: The acquisition interface circuit includes a transceiver U5, resistors R13 to R20, a capacitor C41, a transistor Q1, and a TVS tube D3; the transceiver U5 adopts a transceiver chip model TP8485E-SR; one end of the resistor R15 is connected to pin 12 of the controller U4, pin 1 of the transceiver U5 is connected to pin 13 of the controller U4, the other end of the resistor R15 is connected to the base of the transistor Q1, one end of the resistor R14 is connected to the DC voltage 3.3V, the other end of the resistor R14 is connected to the collector of the transistor Q1, and pins 2 and 3 of the transceiver U5, and pin 4 of the transceiver U5 is connected to the resistor R13. Grounded, pin 8 of the transceiver U5 is connected to one end of the capacitor C41 and then connected to the DC voltage 3.3V, the other end of the capacitor C41 is grounded, pin 6 of the transceiver U5 is connected to one end of the resistors R16, R17, and R19, pin 7 of the transceiver U5 is connected to the other end of the resistor R17 and one end of the resistors R18 and R20, the other end of the resistor R16 is connected to the DC voltage 3.3V, the other end of the resistor R18 is grounded, the other end of the resistor R19 is connected to pin 2 of the TVS tube D3, the other end of the resistor R20 is connected to pin 1 of the TVS tube D3, and pin 3 of the TVS tube D3 is grounded.

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