Optimizer and photovoltaic system

Abstract

The utility model provides an optimizer and a photovoltaic system. The optimizer comprises at least one drive circuit and an impedance matching circuit. The optimizer comprises a main impedance device and at least one parallel adjustment branch connected with the main impedance device in parallel, the parallel adjustment branch comprises an adjustment impedance device, the controllable switch is controlled to be switched off or switched on through the driving circuit, the parallel state of the parallel adjustment branch and the main impedance device is adjusted, and adjustment of impedance of the impedance matching circuit is achieved. And finally, the impedance of the impedance matching circuit is matched with the working frequency point of the communication main node, so that the impedance matching circuit can filter out signal waves outside the working frequency point in a transmission signal of the communication main node, the communication quality between the communication main node and the optimizer is improved, and the requirement of multiple working frequency points of the communication main node is met.

Description

Technical Field

[0001] The utility model relates to the technical field of communications, and more specifically, to an optimizer and a photovoltaic system. Background Art

[0002] In the photovoltaic system, it is necessary to collect data such as power generation and operating parameters of devices such as inverters, combiner boxes, and optimizers. Usually, the inverter serves as the communication master node, and the devices under the inverter (such as combiner boxes, optimizers, etc.) serve as communication slave nodes. Among them, the communication master node and the communication slave node can exchange data through PLC (Power Line Communication) to collect corresponding data. Therefore, PLC plays an important role in the operation of the communication slave node and the data exchange between the communication master node and the slave node.

[0003] Taking the optimizer as an example, the impedance of the communication structure in the existing optimizer is single, which can only meet the requirements of one working frequency point of the communication main node, and therefore cannot be applied to the operation of the communication main node including multiple working frequencies. Utility Model Content

[0004] In view of this, the utility model provides an optimizer and a photovoltaic system, which effectively solve the technical problems existing in the prior art. The optimizer can adjust the impedance through an impedance matching circuit, which not only improves the communication quality between the communication main node and the optimizer, but also meets the requirements of multiple working frequencies of the communication main node.

[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0006] An optimizer, wherein a first interactive end of the optimizer is electrically connected to a communication master node, a second interactive end of the optimizer is electrically connected to a photovoltaic module, and the optimizer comprises: at least one driving circuit and an impedance matching circuit;

[0007] The impedance matching circuit includes a main impedance device and at least one parallel adjustment branch connected in parallel with the main impedance device, any one of the parallel adjustment branches includes an adjustment impedance device, and at least one of the parallel adjustment branches also includes a controllable switch connected in series with the adjustment impedance device;

[0008] In the parallel adjustment branch including the controllable switch, when the controllable switch is disconnected, the parallel adjustment branch is disconnected from the main impedance device and connected in parallel; and when the controllable switch is closed, the parallel adjustment branch is connected in parallel with the main impedance device;

[0009] One of the drive circuits is electrically connected to one of the controllable switches, and the drive circuit is used to control the opening or closing of the controllable switch.

[0010] Optionally, the driving circuit includes: a pull-down circuit, a driving chip and a gate circuit;

[0011] The first end of the pull-down circuit is connected to the control signal, the second end of the pull-down circuit is electrically connected to the driving chip, and the pull-down circuit is used to pull down the loop voltage of the driving circuit to a set voltage when the control signal is not connected;

[0012] The driving chip is electrically connected between the pull-down circuit and the gate circuit, and the driving chip is used to increase the driving capability of the control signal;

[0013] The gate circuit is electrically connected to the control end of the controllable switch, and is used to convert the control signal into an impedance adjustment signal and output it to the control end of the controllable switch, wherein the impedance adjustment signal is used to control the controllable switch to close.

[0014] Optionally, the pull-down circuit includes a first resistor and a second resistor, a first end of the first resistor and a first end of the second resistor are electrically connected and connected to the control signal, a second end of the first resistor is grounded, and a second end of the second resistor is electrically connected to the driving chip;

[0015] The gate circuit includes a third resistor, a fourth resistor and a diode, the first end of the third resistor is electrically connected to the cathode of the diode and is electrically connected to the driving chip, the anode of the diode is electrically connected to the first end of the fourth resistor, the second end of the third resistor is electrically connected to the second end of the fourth resistor and is electrically connected to the control end of the controllable switch.

[0016] Optionally, the driving circuit further includes a current limiting resistor electrically connected to the control end of the controllable switch.

[0017] Optionally, the main impedance device includes an inductor, a first end of the inductor is electrically connected to the communication main node, and a second end of the inductor is electrically connected to the power topology circuit.

[0018] Optionally, the impedance adjustment device includes a capacitor;

[0019] In the parallel adjustment branch not including the controllable switch, the first end of the capacitor is electrically connected to the first end of the inductor, and the second end of the capacitor is electrically connected to the second end of the inductor;

[0020] In the parallel adjustment branch including the controllable switch, the capacitor is connected in series with the controllable switch, and the series-connected capacitor, the controllable switch and the inductor are connected in parallel.

[0021] Optionally, the impedance matching circuit further includes a resistor, the resistor is connected in series with any one of the parallel adjustment branches, and the series-connected resistor, the parallel adjustment branch and the main impedance device are connected in parallel.

[0022] Optionally, the optimizer includes: a main controller electrically connected between the communication main node and the driving circuit, the main controller including at least one control port, one of the control ports being electrically connected to one of the driving circuits, the main controller being used to determine the target impedance matching the operating frequency based on the operating frequency output by the communication main node, and output a control signal through the control port.

[0023] Optionally, the optimizer further includes: a conditioning circuit electrically connected between the communication main node and the main controller, the conditioning circuit being used for pre-processing the working frequency point and then outputting it to the main controller.

[0024] Correspondingly, the utility model also provides a photovoltaic system, which includes the above-mentioned optimizer.

[0025] Compared with the prior art, the technical solution provided by the utility model has at least the following advantages:

[0026] The utility model provides an optimizer and a photovoltaic system, comprising: a first interactive end of the optimizer is electrically connected to a communication main node, and a second interactive end of the optimizer is electrically connected to a photovoltaic component, characterized in that the optimizer comprises: at least one driving circuit and an impedance matching circuit; the impedance matching circuit comprises a main impedance device, and at least one parallel adjustment branch connected in parallel with the main impedance device, any one of the parallel adjustment branches comprises an adjustment impedance device, and at least one of the parallel adjustment branches also comprises a controllable switch connected in series with the adjustment impedance device; in the parallel adjustment branch comprising the controllable switch, when the controllable switch is disconnected, the parallel adjustment branch is disconnected from the main impedance device and connected in parallel; and when the controllable switch is closed, the parallel adjustment branch is connected in parallel with the main impedance device; one of the driving circuits is electrically connected to one of the controllable switches, and the driving circuit is used to control the disconnection or closing of the controllable switch.

[0027] From the above content, it can be seen that the technical solution provided by the utility model is that the optimizer includes a main impedance device and at least one parallel adjustment branch connected in parallel with the main impedance device, and the parallel adjustment branch includes an adjustment impedance device. The controllable switch is controlled to be opened or closed by the driving circuit, and the parallel state of the parallel adjustment branch and the main impedance device is adjusted to achieve the impedance adjustment of the impedance matching circuit, and finally the impedance of the impedance matching circuit is matched with the operating frequency of the communication main node, so that the impedance matching circuit can filter out the signal waves outside the operating frequency in the transmission signal of the communication main node, thereby improving the communication quality between the communication main node and the optimizer, and meeting the requirements of multiple operating frequencies of the communication main node. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the structure of an optimizer provided in an embodiment of the utility model;

[0030] Figure 2 A schematic diagram of the structure of another optimizer provided in an embodiment of the utility model;

[0031] Figure 3 A schematic diagram of the structure of another optimizer provided in an embodiment of the utility model;

[0032] Figure 4 A schematic diagram of the structure of another optimizer provided in an embodiment of the utility model;

[0033] Figure 5 A schematic diagram of the structure of another optimizer provided in an embodiment of the utility model;

[0034] Figure 6 A schematic diagram of the structure of another optimizer provided in an embodiment of the utility model;

[0035] Figure 7 A schematic diagram of the structure of another optimizer provided in an embodiment of the utility model;

[0036] Figure 8 A schematic diagram of the structure of another optimizer provided in an embodiment of the utility model;

[0037] Fig. 9 A schematic diagram of the structure of another optimizer provided in an embodiment of the utility model;

[0038] Fig.10 A schematic diagram of the structure of another optimizer provided in an embodiment of the utility model;

[0039] Fig.11 A schematic diagram of the structure of another optimizer provided in an embodiment of the utility model;

[0040] Fig.12 A schematic structural diagram of a photovoltaic system provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] As described in the background technology, the communication master node and the communication slave node can exchange data through PLC to collect corresponding data. Therefore, PLC plays an important role in the operation of the communication slave node and the data exchange between the communication master node and the slave node. Taking the optimizer as an example, the impedance of the communication structure in the existing optimizer is single, which can only meet the requirements of one working frequency point of the communication master node, and therefore cannot be applied to the operation of the communication master node including multiple working frequencies.

[0043] Based on this, the embodiment of the utility model provides an optimizer and a photovoltaic system, which effectively solves the technical problems existing in the prior art. The optimizer can adjust the impedance through the impedance matching circuit, which not only improves the communication quality between the communication main node and the optimizer, but also meets the requirements of multiple working frequencies of the communication main node.

[0044] To achieve the above purpose, the technical solution provided by the embodiment of the utility model is as follows, specifically combined with Figures 1 to 12 The technical solution provided by the embodiment of the utility model is described in detail.

[0045] refer to Figure 1 , which is a schematic diagram of the structure of an optimizer provided by an embodiment of the utility model, wherein the first interactive end of the optimizer provided by the embodiment of the utility model is electrically connected to the communication main node, and the second interactive end of the optimizer is electrically connected to at least one photovoltaic module. The optimizer includes: at least one driving circuit 100 and an impedance matching circuit 200, and a power topology circuit.

[0046] The impedance matching circuit 200 includes a main impedance device 210 and at least one parallel adjustment branch 220 connected in parallel with the main impedance device 210, any one of the parallel adjustment branches 220 includes an adjustment impedance device 221, and at least one of the parallel adjustment branches 220 also includes a controllable switch K connected in series with the adjustment impedance device 221; in the parallel adjustment branch 220 including the controllable switch K, when the controllable switch K is disconnected, the parallel adjustment branch 220 is disconnected from the main impedance device 210 and connected in parallel; and when the controllable switch K is closed, the parallel adjustment branch 220 is connected in parallel with the main impedance device 210; one of the drive circuits 100 is electrically connected to one of the controllable switches K, and the drive circuit 100 is used to control the disconnection or closing of the controllable switch K.

[0047] It can be understood that the communication master node provided in the embodiment of the utility model communicates with the optimizer in real time, and the operating frequency is assigned to the optimizer according to the optimal power point voltage of the communication master node, and then the optimizer adjusts the impedance of the impedance matching circuit according to the operating frequency assigned by the communication master node, so that the impedance of the impedance matching circuit matches the operating frequency; the communication master node transmits the command signal to the optimizer, and the optimizer filters out the signal waves outside the operating frequency in the communication master node transmission signal, thereby improving the communication quality between the communication master node and the optimizer. At the same time, the optimizer transmits the command of the communication master node to the power topology circuit for processing, and adjusts the photovoltaic components according to the processing results to ensure that each photovoltaic component can output the maximum power under the current environmental conditions. Since the electrical parameters of each photovoltaic component may be inconsistent, or the output power is reduced due to factors such as light shielding and component damage, the optimizer can reduce this mismatch loss.

[0048] Furthermore, the optimizer provided by the embodiment of the utility model includes a main impedance device and at least one parallel adjustment branch connected in parallel with the main impedance device, and the parallel adjustment branch includes an adjustment impedance device. The controllable switch is controlled to be opened or closed by the driving circuit, and the parallel state of the parallel adjustment branch and the main impedance device is adjusted to achieve the impedance adjustment of the impedance matching circuit, and finally the impedance of the impedance matching circuit is matched with the operating frequency of the communication main node, so that the impedance matching circuit can filter out the signal waves outside the operating frequency in the transmission signal of the communication main node, thereby improving the communication quality between the communication main node and the optimizer and meeting the requirements of multiple operating frequencies of the communication main node.

[0049] refer to Figure 2 , which is a schematic diagram of the structure of another optimizer provided by an embodiment of the utility model, wherein the driving circuit 100 provided by the utility model includes: a pull-down circuit 110, a driving chip 120 and a gate circuit 130.

[0050] The first end of the pull-down circuit 110 is connected to the control signal, and the second end of the pull-down circuit 110 is electrically connected to the driver chip 120. The pull-down circuit 110 is used to pull down the loop voltage of the driver circuit 100 to a set voltage when the control signal is not connected, so as to control the controllable switch K to remain disconnected, such as pulling it down to the ground potential. The driver chip 120 is electrically connected between the pull-down circuit 110 and the gate circuit 130, and the driver chip 120 is used to increase the driving ability of the control signal. The gate circuit 130 is electrically connected to the control end of the controllable switch K, and the gate circuit 130 is used to convert the control signal into an impedance adjustment signal and output it to the control end of the controllable switch K, wherein the impedance adjustment signal is used to control the controllable switch K to close.

[0051] In one embodiment of the present invention, the control signal provided by the embodiment of the present invention can be a control voltage, and the impedance adjustment signal can be an impedance adjustment voltage, wherein the drive circuit converts the control voltage into the impedance adjustment voltage. In addition, the control signals connected to different drive circuits provided by the present invention are different, that is, different drive circuits are electrically connected to their respective corresponding control ports for providing control signals.

[0052] It can be understood that after the driving circuit provided by the embodiment of the utility model is connected to the control signal, the control signal is transmitted to the driving chip by the pull-down circuit. The driving chip enhances the driving capability of the control signal and then outputs it to the gate circuit. The gate circuit converts the control signal into an impedance adjustment signal and transmits it to the control end of the controllable switch to control its closure, thereby achieving the purpose of adjusting the impedance of the impedance matching circuit. Also, when the driving circuit is not connected to the control signal, the pull-down circuit pulls down the loop voltage of the driving circuit to a set voltage to keep the controllable switch disconnected, thereby also achieving the purpose of adjusting the impedance of the impedance matching circuit. Thus, the impedance of the impedance matching circuit is adjusted by the way that the driving circuit is connected or not connected to the control signal, and the impedance of the impedance matching circuit is optimized and adjusted to match the working frequency point assigned by the communication main node, so that the impedance matching circuit can filter out the signal wave outside the working frequency point in the transmission signal of the communication main node, thereby improving the communication quality and meeting the requirements of multiple working frequencies of the communication main node.

[0053] refer to Figure 3 As shown, it is a structural schematic diagram of another optimizer provided by an embodiment of the utility model, wherein the pull-down circuit provided by the utility model includes a first resistor R1 and a second resistor R2, the first end of the first resistor R1 and the first end of the second resistor R2 are electrically connected and connected to the control signal, the second end of the first resistor R1 is grounded, and the second end of the second resistor R2 is electrically connected to the driving chip 130.

[0054] The gate circuit includes a third resistor R3, a fourth resistor R4 and a diode D, the first end of the third resistor R3 is electrically connected to the cathode of the diode D and is electrically connected to the driving chip 120, the anode of the diode D is electrically connected to the first end of the fourth resistor R4, the second end of the third resistor R3 is electrically connected to the second end of the fourth resistor R4 and is electrically connected to the control end of the controllable switch K.

[0055] It should be noted that the composition and connection structure of the pull-down circuit and the gate circuit provided in the embodiment of the utility model include but are not limited to the above Figure 3 The structure shown in the figure may also be other components and connection structures in other embodiments of the present invention.

[0056] Furthermore, in order to improve the reliability of the optimizer and avoid damage to the controllable switch, the control end of the controllable switch provided in the embodiment of the utility model can also be electrically connected to a current limiting resistor. Figure 4 As shown, it is a structural schematic diagram of another optimizer provided by an embodiment of the utility model, wherein the driving circuit provided by the utility model also includes a current limiting resistor Rx electrically connected to the control end of the controllable switch K.

[0057] Continue as Figure 4 As shown, when the controllable switch K provided in the embodiment of the utility model is a transistor, the current limiting resistor Rx provided in the embodiment of the utility model can be connected in series between the gate of the controllable switch K and its source.

[0058] It should be noted that the controllable switch provided in the embodiment of the utility model can be a relay, a transistor, etc., and the utility model does not make any specific limitation on this.

[0059] The impedance matching circuit provided by the embodiment of the utility model is described in more detail below in conjunction with the accompanying drawings. Figure 5 As shown, it is a structural schematic diagram of another optimizer provided in an embodiment of the utility model, wherein the main impedance device 210 provided in the embodiment of the utility model includes an inductor, a first end of the inductor is electrically connected to the communication main node, and a second end of the inductor is electrically connected to the power topology circuit.

[0060] It can be understood that the impedance matching circuit provided in the embodiment of the utility model adjusts its own impedance to the target impedance through the cooperation of the inductor and the parallel adjustment branch. If all the parallel adjustment branches include controllable switches, all the parallel adjustment branches connected in parallel with the inductor can be disconnected by the controllable switch, so that the impedance matching circuit is a pure inductor circuit; or, according to the adjustment requirements, the corresponding controllable switch is selected to be closed, and the parallel adjustment branch is connected in parallel with the inductor to achieve the purpose of adjusting the own impedance.

[0061] In one embodiment of the utility model, the main impedance device provided by the utility model embodiment may include an inductor, and the parallel adjustment branch may include a capacitor, so that the impedance matching circuit forms an LC resonant circuit, and the impedance of the LC resonant circuit is adjusted to achieve the purpose of adjusting its resonant frequency to match the working frequency assigned to the communication main node; further, when the communication main node transmits a signal to the LC resonant circuit, the LC resonant circuit blocks the signal waves outside the working frequency, thereby improving the wave blocking effect on the signal transmitted by the communication main node and improving the communication quality. Specifically, Figure 6 , which is a schematic diagram of the structure of another optimizer provided by an embodiment of the utility model, wherein the impedance adjustment device 221 provided by the embodiment of the utility model includes a capacitor C, and in the parallel adjustment branch 220 not including the controllable switch K, the first end of the capacitor C is electrically connected to the first end of the inductor, and the second end of the capacitor C is electrically connected to the second end of the inductor. And, in the parallel adjustment branch 220 including the controllable switch K, the capacitor C is connected in series with the controllable switch K, and the capacitor and the controllable switch K connected in series are connected in parallel with the inductor as a whole.

[0062] It can be understood that the impedance matching circuit provided in the embodiment of the utility model does not need to amplify the capacity of the inductor, and does not need to increase the volume and cost of the inductor. It only needs to match the inductor with at least one capacitor to achieve the purpose of adjusting the impedance of the impedance matching circuit, thereby improving the PLC communication quality of the signal path between the communication main node, the impedance matching circuit and the power topology circuit.

[0063] Further references Figure 7 As shown, it is a structural schematic diagram of another optimizer provided in an embodiment of the utility model, wherein the impedance matching circuit provided in the embodiment of the utility model also includes a resistor R, and the resistor R is connected in series with any one of the parallel adjustment branches 220, and the series-connected resistor R and the parallel adjustment branch 220 are connected in parallel with the main impedance device 210 as a whole, so that the oscillation of the transmission signal can be reduced by the resistor R, thereby improving the performance of the impedance matching circuit.

[0064] The following is a more detailed description of several representative impedance matching circuits provided by the embodiments of the present invention in conjunction with the accompanying drawings. Figure 8As shown, it is a structural schematic diagram of another optimizer provided in an embodiment of the utility model, wherein the impedance matching circuit provided in the embodiment of the utility model includes a parallel adjustment branch, the impedance adjustment device in the parallel adjustment branch includes the capacitor C, and the parallel adjustment branch includes the controllable switch K, wherein the first end of the capacitor C is electrically connected to the first end of the inductor branch 210, the second end of the capacitor C is electrically connected to the first end of the controllable switch K, the second end of the controllable switch K is electrically connected to the first end of the resistor R, and the second end of the resistor R is electrically connected to the second end of the inductor branch 210.

[0065] Continue as Figure 8 As shown, when the controllable switch K provided in the embodiment of the utility model is closed, the capacitor C and the inductor L form an LC resonant circuit, and the resonant frequency is 1 / (2*π*√(L*C)). And, when the controllable switch K is disconnected, the impedance matching circuit is a pure inductance circuit. Therefore, the resonant frequency of the impedance matching circuit is adjusted by closing or disconnecting the controllable switch K, thereby achieving the purpose of adjusting the self-impedance.

[0066] It can be understood that in the optimizer provided by the embodiment of the utility model, the impedance matching circuit can be a two-stage impedance adjustable circuit, that is, the impedance can be adjusted twice. When the communication main node allocates the working frequency, the matching target impedance is calculated according to the analysis of the working frequency, and then the driving circuit outputs an impedance adjustment signal carrying the target impedance information. The controllable switch closes in response to the impedance adjustment signal, so that the resonant frequency of the impedance matching circuit matches the working frequency, thereby adjusting the impedance of the impedance matching circuit to the target impedance. As a result, the communication main node can block signal waves outside the working frequency through the impedance matching circuit when transmitting signals, thereby improving the communication quality between the communication main node and the power topology circuit, and at the same time meeting the operation requirements of multiple working frequencies of the communication main node.

[0067] refer to Fig. 9As shown, it is a structural schematic diagram of another optimizer provided by an embodiment of the utility model, wherein the impedance matching circuit provided by the embodiment of the utility model includes two parallel adjustment branches, namely a first parallel adjustment branch and a second parallel adjustment branch, the capacitor included in the impedance adjustment device in the first parallel adjustment branch is a first capacitor C1, the capacitor included in the impedance adjustment device in the second parallel adjustment branch is a second capacitor C2, and the second parallel adjustment branch includes the controllable switch K, wherein the first end of the first capacitor C1 is electrically connected to the first end of the inductor branch 210, the second end of the first capacitor C1 is electrically connected to the first end of the resistor R, and the second end of the resistor R is electrically connected to the second end of the inductor branch 210; the first end of the second capacitor C2 is electrically connected to the first end of the inductor branch 210, the second end of the second capacitor C2 is electrically connected to the first end of the controllable switch K, and the second end of the controllable switch K is electrically connected to both the second end of the first capacitor C1 and the first end of the resistor R.

[0068] Continue as Fig. 9 As shown, when the controllable switch K provided in the embodiment of the utility model is closed, the first capacitor C1 and the second capacitor C2 are connected in parallel to form an LC resonant circuit with the inductor L, and the resonant frequency is 1 / (2*π*√(L*(C1+C2))). And, when the controllable switch K is disconnected, the first capacitor C1 and the inductor L form an LC resonant circuit, and the resonant frequency is 1 / (2*π*√(L*C1)). Therefore, the resonant frequency of the impedance matching circuit is adjusted by closing or disconnecting the controllable switch K, thereby achieving the purpose of adjusting the self-impedance.

[0069] It can be understood that in the optimizer provided by the embodiment of the utility model, the impedance matching circuit can be a two-stage impedance adjustable circuit. When the communication main node allocates the working frequency, the matching target impedance is calculated according to the analysis of the working frequency, and then the driving circuit outputs an impedance adjustment signal carrying the target impedance. The controllable switch closes in response to the impedance adjustment signal, so that the resonant frequency of the impedance matching circuit matches the working frequency, thereby adjusting the impedance of the impedance matching circuit to the target impedance. As a result, the communication main node can block signal waves outside the working frequency through the impedance matching circuit when transmitting signals, thereby improving the communication quality between the communication main node and the power topology circuit, and at the same time meeting the operation requirements of multiple working frequencies of the communication main node.

[0070] refer to Fig.10As shown, it is a structural schematic diagram of another optimizer provided by an embodiment of the utility model, wherein the impedance matching circuit provided by the embodiment of the utility model includes a plurality of parallel adjustment branches, namely, a first parallel adjustment branch to an Nth parallel adjustment branch, the capacitor included in the impedance adjustment device in the i-th parallel adjustment branch is the i-th capacitor Ci, and the controllable switch included in the i-th parallel adjustment branch is the i-th controllable switch Ki, N is an integer greater than 1, and i is a positive integer not greater than N, wherein the first end of the i-th capacitor Ci is electrically connected to the first end of the inductor branch 210, the second end of the i-th capacitor Ci is electrically connected to the first end of the i-th controllable switch Ki, the second end of the i-th controllable switch Ki is electrically connected to the first end of the resistor R, and the second end of the resistor R is electrically connected to the second end of the inductor branch 210.

[0071] Continue as Fig.10 As shown, when at least one of the first controllable switch K1 to the Nth controllable switch Kn provided by the embodiment of the utility model is closed, the corresponding capacitors of the first capacitor C1 to the Nth capacitor Cn are connected in parallel to form an LC resonant circuit with the inductor L. When all the controllable switches are closed, the resonant frequency is 1 / (2*π*√(L*(C1+......+Cn))). And, when all the controllable switches of the first controllable switch K1 to the Nth controllable switch Kn are disconnected, the impedance matching circuit is a pure inductance circuit. Therefore, the resonant frequency of the impedance matching circuit is adjusted by closing or disconnecting the controllable switch K, thereby achieving the purpose of adjusting the self-impedance.

[0072] It can be understood that in the optimizer provided by the embodiment of the utility model, the impedance matching circuit can be a two-stage, three-stage or more stage impedance adjustable circuit. When the communication main node allocates the working frequency, the matching target impedance is calculated according to the analysis of the working frequency, and then the driving circuit outputs an impedance adjustment signal carrying the target impedance. The first controllable switch to the Nth controllable switch respond to the impedance adjustment signal and choose to close, so that the resonant frequency of the impedance matching circuit matches the working frequency, thereby adjusting the impedance of the impedance matching circuit to the target impedance. As a result, the communication main node can block signal waves outside the working frequency through the impedance matching circuit when transmitting signals, thereby improving the communication quality between the communication main node and the power topology circuit, and at the same time meeting the operation requirements of multiple working frequencies of the communication main node.

[0073] It should be noted that the optimizer provided in the embodiment of the utility model includes but is not limited to the above Figures 8 to 10The several specific components and connection structures shown, in other embodiments of the present invention, the optimizer can also be other components and connection structures, and the present invention does not make specific restrictions on this. Optionally, the impedance matching circuit provided by the embodiment of the present invention can also include a total controllable switch, wherein the total controllable switch is connected in series with the resistor, and the control end of the total controllable switch is electrically connected to a total drive circuit, and the structure of the total drive circuit can be the same as the structure of the drive circuit provided in any of the above embodiments, wherein the total control switch can be closed in response to the impedance adjustment signal to participate in the impedance adjustment. In addition, the total controllable switch can also be disconnected in response to a fault control signal to improve the safety of the circuit.

[0074] refer to Fig.11 As shown, it is a structural schematic diagram of another optimizer provided by an embodiment of the utility model, wherein the optimizer provided by an embodiment of the utility model includes: a main controller 300 electrically connected between the communication main node and the drive circuit 100, the main controller 300 includes at least one control port, one control port is electrically connected to one drive circuit, and the main controller is used to determine the target impedance matching the working frequency point according to the working frequency point output by the communication main node, and output a control signal through the control port. Then, the control signal is transmitted to the drive circuit, so that the drive circuit outputs an impedance adjustment signal to the control end of the corresponding controllable switch to control its closure.

[0075] Furthermore, the optimizer provided in the embodiment of the utility model further includes: a conditioning circuit 400 electrically connected between the communication main node and the main controller 300, and the conditioning circuit 400 is used to pre-process the working frequency point and then output it to the main controller 300.

[0076] It can be understood that the conditioning circuit provided in the embodiment of the utility model performs preprocessing on the working frequency point, which may include at least one of filtering, amplification, etc. The filtering process can filter out the stray components in the working frequency point, and improve the quality and accuracy of the working frequency point transmitted to the processing unit; while the amplification process can amplify the signal strength of the working frequency point, which is convenient for the processing unit to perform signal analysis processing, thereby improving the processing effect of the optimizer on the working frequency point.

[0077] Accordingly, the embodiment of the utility model also provides a photovoltaic system. Fig.12As shown, it is a schematic diagram of the structure of a photovoltaic system provided by an embodiment of the utility model, wherein the photovoltaic system provided by the embodiment of the utility model includes the optimizer 1 provided by any of the above embodiments. Among them, the first interactive end of the optimizer 1 is electrically connected to the communication master node, and the second interactive end of the optimizer 1 is electrically connected to the photovoltaic component 3. Optionally, the communication master node provided by the embodiment of the utility model may include an inverter 2, and the utility model does not make specific restrictions on this.

[0078] An embodiment of the utility model provides an optimizer and a photovoltaic system, comprising: a first interactive end of the optimizer is electrically connected to a communication main node, and a second interactive end of the optimizer is electrically connected to a photovoltaic component, characterized in that the optimizer comprises: at least one driving circuit and an impedance matching circuit; the impedance matching circuit comprises a main impedance device, and at least one parallel adjustment branch connected in parallel with the main impedance device, any one of the parallel adjustment branches comprises an adjustment impedance device, and at least one of the parallel adjustment branches also comprises a controllable switch connected in series with the adjustment impedance device; in the parallel adjustment branch comprising the controllable switch, when the controllable switch is disconnected, the parallel adjustment branch is disconnected from the main impedance device and connected in parallel; and when the controllable switch is closed, the parallel adjustment branch is connected in parallel with the main impedance device; one driving circuit is electrically connected to one controllable switch, and the driving circuit is used to control the disconnection or closing of the controllable switch.

[0079] From the above content, it can be seen that the technical solution provided by the embodiment of the utility model, the optimizer includes a main impedance device and at least one parallel adjustment branch connected in parallel with the main impedance device, and the parallel adjustment branch includes an adjustment impedance device, and the controllable switch is controlled by the driving circuit to be opened or closed, and the parallel state of the parallel adjustment branch and the main impedance device is adjusted to achieve the impedance adjustment of the impedance matching circuit, and finally the impedance of the impedance matching circuit is matched with the operating frequency of the communication main node, so that the impedance matching circuit can filter out the signal waves outside the operating frequency in the transmission signal of the communication main node, thereby improving the communication quality between the communication main node and the optimizer, and meeting the requirements of multiple operating frequencies of the communication main node.

[0080] In the description of the present invention, it should be understood that the orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0081] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0082] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0084] In the present utility model, if the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0085] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An optimizer, wherein a first interactive end of the optimizer is electrically connected to a communication master node, and a second interactive end of the optimizer is electrically connected to a photovoltaic module, characterized in that: The optimizer includes: at least one driving circuit and an impedance matching circuit; The impedance matching circuit includes a main impedance device and at least one parallel adjustment branch connected in parallel with the main impedance device, any one of the parallel adjustment branches includes an adjustment impedance device, and at least one of the parallel adjustment branches also includes a controllable switch connected in series with the adjustment impedance device; In the parallel adjustment branch including the controllable switch, when the controllable switch is disconnected, the parallel adjustment branch is disconnected from the main impedance device and connected in parallel; and when the controllable switch is closed, the parallel adjustment branch is connected in parallel with the main impedance device; One of the drive circuits is electrically connected to one of the controllable switches, and the drive circuit is used to control the opening or closing of the controllable switch.

2. The optimizer according to claim 1, characterized in that The driving circuit comprises: a pull-down circuit, a driving chip and a gate circuit; The first end of the pull-down circuit is connected to the control signal, the second end of the pull-down circuit is electrically connected to the driving chip, and the pull-down circuit is used to pull down the loop voltage of the driving circuit to a set voltage when the control signal is not connected; The driving chip is electrically connected between the pull-down circuit and the gate circuit, and the driving chip is used to increase the driving capability of the control signal; The gate circuit is electrically connected to the control end of the controllable switch, and is used to convert the control signal into an impedance adjustment signal and output it to the control end of the controllable switch, wherein the impedance adjustment signal is used to control the controllable switch to close.

3. The optimizer according to claim 2, characterized in that The pull-down circuit comprises a first resistor and a second resistor, wherein a first end of the first resistor is electrically connected to a first end of the second resistor and receives the control signal, a second end of the first resistor is grounded, and a second end of the second resistor is electrically connected to the driving chip; The gate circuit includes a third resistor, a fourth resistor and a diode, the first end of the third resistor is electrically connected to the cathode of the diode and is electrically connected to the driving chip, the anode of the diode is electrically connected to the first end of the fourth resistor, the second end of the third resistor is electrically connected to the second end of the fourth resistor and is electrically connected to the control end of the controllable switch.

4. The optimizer according to claim 2, characterized in that The driving circuit also includes a current limiting resistor electrically connected to the control terminal of the controllable switch.

5. The optimizer according to claim 1, characterized in that The main impedance device includes an inductor, a first end of the inductor is electrically connected to the communication main node, and a second end of the inductor is electrically connected to the power topology circuit.

6. The optimizer according to claim 5, characterized in that The impedance adjustment device includes a capacitor; In the parallel adjustment branch not including the controllable switch, the first end of the capacitor is electrically connected to the first end of the inductor, and the second end of the capacitor is electrically connected to the second end of the inductor; In the parallel adjustment branch including the controllable switch, the capacitor is connected in series with the controllable switch, and the capacitor, the controllable switch and the inductor are connected in parallel.

7. The optimizer according to claim 6, characterized in that The impedance matching circuit further includes a resistor, which is connected in series with any one of the parallel adjustment branches, and the series-connected resistor, the parallel adjustment branch and the main impedance device are connected in parallel.

8. The optimizer according to claim 1, characterized in that The optimizer includes: a main controller electrically connected between the communication main node and the driving circuit, the main controller includes at least one control port, one of the control ports is electrically connected to one of the driving circuits, the main controller is used to determine a target impedance matching the operating frequency according to the operating frequency output by the communication main node, and output a control signal through the control port.

9. The optimizer according to claim 8, characterized in that The optimizer also includes: a conditioning circuit electrically connected between the communication main node and the main controller, and the conditioning circuit is used to pre-process the working frequency point and then output it to the main controller.

10. A photovoltaic system, characterized in that: The photovoltaic system comprises the optimizer according to any one of claims 1-9.

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