Photovoltaic module turn-off device based on power line carrier communication

Abstract

The utility model belongs to the technical field of photovoltaic module turn-off devices, and particularly relates to a photovoltaic module turn-off device based on power line carrier communication, which is characterized in that a PLC chip realizes PLC communication with a power line through a PLC transformer, and is connected with a first field-effect tube and a second field-effect tube through a control end to realize connection and disconnection of power output of a photovoltaic module; according to the utility model, communication is realized through the power line, additional communication line arrangement and original line reconstruction are not needed, the layout and maintenance cost is reduced, and the network flexibility is higher; and the switching-off is realized through the field effect transistor, so that the switching loss of the circuit is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic component switches, and in particular relates to a photovoltaic component switch based on power line carrier communication. Background Art

[0002] Photovoltaic shut-off device is an electrical protection device in photovoltaic power generation system. Its main function is to quickly and safely disconnect the photovoltaic array from the power grid or energy storage system when necessary to ensure personnel safety, system equipment protection and meet fire safety requirements. Photovoltaic shut-off device is usually integrated into the electrical protection and control system of photovoltaic system, and works together with inverter, monitoring system, etc. Photovoltaic shut-off device monitors the operating status of photovoltaic system (such as current, voltage, etc.), and automatically or manually starts the shutdown mechanism to cut off the circuit when abnormal conditions (such as overload, short circuit, overvoltage) are detected or external control instructions are received.

[0003] In the prior art, photovoltaic circuit breakers are usually connected to the control system via RS485 bus communication. RS485 bus communication has strong long-distance transmission capability, strong anti-interference ability, mature technology, strong compatibility, and is widely used in the communication of photovoltaic circuit breakers. At the same time, RS485 bus requires special twisted pair cables for data transmission, which requires additional wiring work, increases construction difficulty and cost, and also requires additional line maintenance costs. In addition, RS485 bus usually adopts a terminal matching bus structure, which limits its flexibility in network layout. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of the photovoltaic switch in the prior art that the communication cost is high and the flexibility is poor, thereby providing a photovoltaic assembly switch based on power line carrier communication.

[0005] The utility model discloses a photovoltaic component switch based on power line carrier communication, comprising a PLC chip, a PLC transformer, a first field effect transistor and a second field effect transistor; a PLC communication end of the PLC chip is connected to the output winding of the PCL transformer through a coupling capacitor, and the input winding of the PLC transformer is connected in series to the power line; a control end of the PLC chip is connected to the gates of the first field effect transistor and the second field effect transistor, a drain of the first field effect transistor and a source of the second field effect transistor are connected to the positive power output end of the photovoltaic component, and a negative power output end of the photovoltaic component is grounded; a positive power output end of the switch is connected to the source of the first field effect transistor and the drain of the second field effect transistor, and a negative power output end of the switch is grounded through an inductor.

[0006] Furthermore, the inductance of the input winding and the output winding of the PLC transformer are both 63 μh.

[0007] Furthermore, the PLC communication terminal of the PLC chip includes a PLC positive communication terminal and a PLC negative communication terminal, which are respectively connected to two ends of the output winding of the PLC transformer via a coupling capacitor.

[0008] Furthermore, it also includes a first transient voltage suppression diode, wherein the anode of the first transient voltage suppression diode is connected to the negative power output terminal of the photovoltaic component, and the cathode of the first transient voltage suppression diode is connected to the positive power output terminal of the photovoltaic component.

[0009] Furthermore, it also includes a second transient voltage suppression diode, wherein the anode of the second transient voltage suppression diode is connected to the negative power output terminal of the circuit breaker, and the cathode of the second transient voltage suppression diode is connected to the positive power output terminal of the circuit breaker.

[0010] Furthermore, a first resistor is connected between the gate and drain of the second field effect transistor.

[0011] Furthermore, the positive power output terminal of the circuit breaker is grounded via a fourth capacitor.

[0012] Furthermore, it also includes a third transient voltage suppression diode and a fourth transient voltage suppression diode, wherein the cathodes of the third transient voltage suppression diode and the fourth transient voltage suppression diode are respectively connected to the positive power output terminal of the circuit breaker, and the anodes are grounded.

[0013] Beneficial effects: The utility model discloses a photovoltaic module shut-down device based on power line carrier communication. The PLC chip realizes PLC communication with the power line through a PLC transformer, and the power output of the photovoltaic module is turned on and off by connecting the first field effect transistor and the second field effect transistor at the control end. By realizing communication through the power line, the utility model does not require additional communication line settings and original line modifications, thus reducing deployment and maintenance costs and having higher network flexibility. And by realizing shutdown through the field effect transistor, the switching loss of the circuit is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application 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 described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the overall circuit principle of the utility model.

[0016] Explanation of the accompanying drawings: U1, PLC chip; Q1, first field effect transistor; Q2, second field effect transistor; T1, PLC transformer; D1, first transient voltage suppression diode; D2, second transient voltage suppression diode; D3, third transient voltage suppression diode; D4, fourth state voltage suppression diode; Z1, crystal oscillator; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; C5, fifth capacitor; C6, sixth capacitor; C7, seventh capacitor; C8, eighth capacitor; C9, ninth capacitor; C10, tenth capacitor; C11, eleventh capacitor; C12, twelfth capacitor; C13, thirteenth capacitor; C14, fourteenth capacitor; L1, inductor; R1, first resistor; R2, second resistor; R3, third resistor. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0018] In the description of the present application, it should be understood that 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0019] In this application, unless otherwise clearly specified 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 connection; it can be a mechanical connection or an electrical connection; 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 this application can be understood according to specific circumstances.

[0020] Reference Figure 1As shown, this embodiment provides a photovoltaic module shut-off device based on power line carrier communication, including a PLC chip U1, a PLC transformer T1, a first field effect transistor Q1 and a second field effect transistor Q2; the PLC communication end of the PLC chip U1 is connected to the output winding of the PLC transformer T1 through a coupling capacitor, and the input winding of the PLC transformer T1 is connected in series to the power line; the control end of the PLC chip T1 is connected to the gates of the first field effect transistor Q1 and the second field effect transistor Q2, the drain of the first field effect transistor Q1 and the source of the second field effect transistor Q2 are connected to the positive power output end of the photovoltaic module, and the negative power output end of the photovoltaic module is grounded; the positive power output end of the shut-off device is connected to the source of the first field effect transistor Q1 and the drain of the second field effect transistor Q1, and the negative power output end of the shut-off device is grounded through an inductor.

[0021] The present embodiment discloses a photovoltaic module switch based on power line carrier communication, in which the PLC chip U1 realizes PLC communication with the power line through the PLC transformer T1, and connects the first field effect transistor Q1 and the second field effect transistor Q2 through the control end to realize the connection and shutdown of the photovoltaic module power output; by realizing communication through the power line, the utility model does not need additional communication line setting and original line modification, thus reducing the layout and maintenance costs and having higher network flexibility; and by realizing shutdown through the field effect transistor, the switching loss of the circuit is reduced.

[0022] Specifically, the specific model of the PLC transformer T1 is T0867CE, and the inductance of the input winding and the output winding are both 63 μh.

[0023] The specific model of the PLC chip U1 is SG100. The PLC communication terminal includes a PLC positive communication terminal PLC+ and a PLC negative communication terminal PLC-, which are connected to the two ends of the output winding of the PLC transformer through a coupling capacitor, namely the seventh capacitor C7 and the eighth capacitor C8; the positive power supply terminal PV+ is connected to the positive power output end of the photovoltaic module, and is grounded through the first capacitor C1 of 2.2μ, the second capacitor C2 of 2.2μ and the third capacitor C3 of 100n respectively; the negative power supply terminal PV- is grounded; the OOR terminal is grounded; the XTAL1 terminal is connected to the first end of the crystal oscillator Z1, and is grounded through the fifth capacitor C5 of 27p; the XTAL2 terminal is connected The third end of the crystal oscillator Z1 is grounded through the 27p sixth capacitor C6; a 1M second resistor R2 is connected between the XTAL1 end and the XTAL2 end; the second end and the fourth end of the crystal oscillator Z1 are grounded; the control end OL is connected to the gate of the first field effect transistor Q1 and the second field effect transistor Q2; the TM end is grounded; the STYB end is connected to the drain of the second field effect transistor Q2; the BP1V end is grounded through the 1μ thirteenth capacitor C13; the BP5V end is grounded through the 1μ eleventh capacitor C11 and the 1μ twelfth capacitor C12 respectively; the BP18V end is grounded through the 1μ ninth capacitor C9 and the 1μ tenth capacitor C10 respectively; the CND end is grounded.

[0024] It also includes a first transient voltage suppression diode D1, specifically a SMBJ70CA, wherein the positive electrode of the first transient voltage suppression diode D1 is connected to the negative power output terminal of the photovoltaic component, and the negative electrode is connected to the positive power output terminal of the photovoltaic component.

[0025] It also includes a second transient voltage suppression diode D2, the specific model is SMBJ100A, the anode of the second transient voltage suppression diode D2 is connected to the negative power output terminal of the circuit breaker, and the cathode is connected to the positive power output terminal of the circuit breaker.

[0026] A first resistor R1 of 3M is connected between the gate and drain of the second field effect tube to suppress the output load of SG100 and play a stabilizing role of clamping.

[0027] The positive power output terminal of the shutdown device is connected to the ground through a fourth capacitor C4 of 2.2μ.

[0028] It also includes a third transient voltage suppression diode D3 and a fourth transient voltage suppression diode D4, which are used to cooperate with the fourth capacitor C4 to buffer the transient voltage. The cathodes of the third transient voltage suppression diode D3 and the fourth transient voltage suppression diode D4 are respectively connected to the positive power output terminal of the circuit breaker, and the anodes are grounded. The third transient voltage suppression diode D3 and the fourth transient voltage suppression diode D4 are two diodes connected in parallel, and the specific model is TP60100C. In this embodiment, the specific model of the first field effect transistor Q1 is RS60N130G, and its three drains are connected to each other, and the four sources are connected to each other. The specific model of the second field effect transistor Q2 is SFS10R10DF.

[0029] In this embodiment, the first ends of the inductor L1, 330n, the fourteenth capacitor C14, and the third resistor R3 are grounded, and the second ends are connected to the first end of the output winding of the PLC transformer T1 to form a PLC receiving resonator to receive signals from the PLC signal transmitter.

[0030] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0031] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A photovoltaic module switch based on power line carrier communication, characterized in that: It includes a PLC chip, a PLC transformer, a first field effect transistor and a second field effect transistor; the PLC communication end of the PLC chip is connected to the output winding of the PLC transformer through a coupling capacitor, and the input winding of the PLC transformer is connected in series to the power line; the control end of the PLC chip is connected to the gates of the first field effect transistor and the second field effect transistor, the drain of the first field effect transistor and the source of the second field effect transistor are connected to the positive power output end of the photovoltaic component, and the negative power output end of the photovoltaic component is grounded; the positive power output end of the shutdown device is connected to the source of the first field effect transistor and the drain of the second field effect transistor, and the negative power output end of the shutdown device is grounded through an inductor.

2. A photovoltaic module switch based on power line carrier communication according to claim 1, characterized in that: The inductance of the input winding and the output winding of the PLC transformer are both 63 μh.

3. A photovoltaic module switch based on power line carrier communication according to claim 1, characterized in that: The PLC communication terminal of the PLC chip includes a PLC positive communication terminal and a PLC negative communication terminal, which are respectively connected to two ends of the output winding of the PLC transformer via a coupling capacitor.

4. A photovoltaic module switch based on power line carrier communication according to claim 1, characterized in that: It also includes a first transient voltage suppression diode, wherein the anode of the first transient voltage suppression diode is connected to the negative power output terminal of the photovoltaic component, and the cathode of the first transient voltage suppression diode is connected to the positive power output terminal of the photovoltaic component.

5. A photovoltaic module switch based on power line carrier communication according to claim 1, characterized in that: It also includes a second transient voltage suppression diode, wherein the anode of the second transient voltage suppression diode is connected to the negative power output terminal of the circuit breaker, and the cathode of the second transient voltage suppression diode is connected to the positive power output terminal of the circuit breaker.

6. A photovoltaic assembly switch based on power line carrier communication according to claim 1, characterized in that: A first resistor is connected between the gate and the drain of the second field effect transistor.

7. A photovoltaic assembly switch based on power line carrier communication according to claim 1, characterized in that: The positive power output terminal of the shutdown device is grounded via a fourth capacitor.

8. A photovoltaic assembly switch based on power line carrier communication according to claim 1, characterized in that: It also includes a third transient voltage suppression diode and a fourth transient voltage suppression diode, wherein the cathodes of the third transient voltage suppression diode and the fourth transient voltage suppression diode are respectively connected to the positive power output terminal of the circuit breaker, and the anodes are grounded.

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