A photovoltaic DC isolated electric switch drive circuit and photovoltaic equipment

Abstract

This utility model relates to the field of photovoltaic equipment technology, and in particular to a photovoltaic DC-isolated electric switch drive circuit and photovoltaic equipment. The photovoltaic DC-isolated electric switch drive circuit includes: a drive module and an electric disconnect switch; the drive module is connected to the power supply terminal of the electric disconnect switch and an inverter respectively; the input terminal of the electric disconnect switch is connected to the photovoltaic panel, and the output terminal of the electric disconnect switch is connected to the inverter; the drive module is used to output a disconnect signal to the electric disconnect switch when a fault signal is received, the fault signal being a signal generated by the inverter when a fault occurs; the electric disconnect switch is used to disconnect the circuit between the photovoltaic panel and the inverter when the disconnect signal is received. Compared to existing DC disconnect switches that require manual disconnection by the user, this utility model can automatically control the disconnection of the electric disconnect switch through the drive module, improving the timeliness of circuit protection.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic equipment technology, and in particular to a photovoltaic DC isolated electric switch drive circuit and photovoltaic equipment. Background Technology

[0002] Currently, in photovoltaic power generation systems, photovoltaic panels can be connected to the inverter via a DC disconnect switch, thereby ensuring that the circuit connection between the photovoltaic panels and the inverter can be disconnected via the DC disconnect switch when the inverter fails.

[0003] However, when existing inverters malfunction, users typically manually disconnect the DC isolating switch. If users are not aware of the fault in time, the manual disconnection may not be timely, resulting in low circuit protection timeliness. Utility Model Content

[0004] The main purpose of this utility model is to provide a photovoltaic DC isolation electric switch drive circuit and photovoltaic equipment, which aims to solve the technical problem that when the inverter fails, the user needs to manually disconnect the DC isolation switch, resulting in low protection timeliness.

[0005] To achieve the above objectives, this utility model proposes a photovoltaic DC isolated electric switch drive circuit, which includes: a drive module and an electric isolating switch; The drive module is connected to the power supply terminal of the electric disconnect switch and the inverter respectively. The input terminal of the electric disconnect switch is connected to the photovoltaic panel, and the output terminal of the electric disconnect switch is connected to the inverter. The drive module is used to output a disconnect signal to the electric disconnect switch when a fault signal is received, wherein the fault signal is a signal generated by the inverter when a fault occurs. The electric disconnect switch is used to disconnect the circuit between the photovoltaic panel and the inverter when the disconnection signal is received.

[0006] In one embodiment, the driving module includes: a first switching unit and a first switching unit; The first switching unit is connected to the inverter and the first switching unit respectively, and the first switching unit is connected to the power supply of the drive power supply and the power supply terminal of the electric disconnect switch respectively. The first switching unit is configured to output a first switching signal to the first switching unit when the fault signal is received; The first switching unit is configured to, upon receiving the first switching signal, connect the circuit between the driving power supply and the power supply terminal of the electric disconnect switch, so that the driving power supply transmits a disconnect signal to the electric disconnect switch.

[0007] In one embodiment, the driving module further includes: a first locking unit; The first locking unit is connected to both the first switching unit and the first switch unit. The first locking unit is used to output a first locking signal to the first switching unit when the first switching unit connects the circuit between the driving power supply and the power supply terminal of the electric disconnect switch; The first switching unit is further configured to continuously output the first switching signal to the first switching unit when receiving the first locking signal, so that the first switching unit continuously connects the circuit between the driving power supply and the power supply terminal of the electric disconnect switch.

[0008] In one embodiment, the driving module further includes: a first unlocking unit; The first unlocking unit is connected to both the inverter and the first switching unit. The first unlocking unit is used to output a first unlocking signal to the first switching unit when a reset signal is received, wherein the reset signal is a signal generated by the inverter when the electric disconnecting switch needs to stop receiving the disconnect signal; The first switching unit is further configured to stop outputting the first switching signal to the first switching unit when it receives the first unlocking signal; The first switching unit is further configured to disconnect the circuit between the drive power supply and the power supply terminal of the electric disconnect switch when it stops receiving the first switching signal.

[0009] In one embodiment, the driving module includes: a second switching unit, a third switching unit, and a second switching unit; The second switching unit is connected to the inverter and the third switching unit respectively. The third switching unit is connected to the drive power supply, the power supply terminal of the electric disconnect switch and the second switching unit respectively. The second switching unit is connected to the ground terminal of the electric disconnect switch. The second switching unit is configured to output a second switching signal to the third switching unit when the fault signal is received; The third switching unit is used to output a third switching signal to the second switching unit when it receives the second switching signal; The second switching unit is used to connect the circuit between the grounding terminal of the electric disconnect switch and the reference ground when the third switching signal is received, so that the drive power supply transmits the disconnect signal to the electric disconnect switch.

[0010] In one embodiment, the driving module further includes: a second locking unit; The second locking unit is connected to both the third switching unit and the second switching unit. The second locking unit is used to output a second locking signal to the second switching unit when the third switching unit outputs the third switching signal; The second switching unit is further configured to continuously output the second switching signal to the third switching unit when receiving the second locking signal, so that the third switching unit continuously outputs the third switching signal.

[0011] In one embodiment, the driving module further includes: a second unlocking unit; The second unlocking unit is connected to both the inverter and the second switching unit. The second unlocking unit is used to output a second unlocking signal to the second switching unit when a reset signal is received. The reset signal is a signal generated by the inverter when the electric disconnecting switch needs to stop receiving the disconnect signal. The second switching unit is further configured to stop outputting the second switching signal to the third switching unit upon receiving the second unlocking signal. The third switching unit is further configured to stop outputting the third switching signal to the second switching unit when it stops receiving the second switching signal; The second switching unit is further configured to disconnect the circuit between the grounding terminal of the electric disconnecting switch and the reference ground when it stops receiving the third switching signal.

[0012] In one embodiment, the driving module further includes: a third locking unit; The third locking unit is connected to both the third switching unit and the second switching unit; The third locking unit is used to output a third locking signal to the third switching unit when the third switching unit outputs the third switching signal; The third switching unit is also configured to continuously output the third switching signal to the second switching unit when the third locking signal is received.

[0013] In one embodiment, the driving module further includes: a third unlocking unit; The third unlocking unit is connected to both the inverter and the third locking unit. The third unlocking unit is used to output a third unlocking signal to the third locking unit when a reset signal is received. The reset signal is a signal generated by the inverter when the electric disconnect switch needs to stop receiving the disconnect signal. The third locking unit is further configured to stop outputting the third locking signal to the third switching unit when the third unlocking signal is received; The third switching unit is also used to stop outputting the third switching signal to the second switching unit when it stops receiving the third locking signal; The second switching unit is further configured to disconnect the circuit between the grounding terminal of the electric disconnecting switch and the reference ground when it stops receiving the third switching signal.

[0014] In addition, to achieve the above objectives, this utility model also proposes a photovoltaic device, which includes the photovoltaic DC isolated electric switch drive circuit as described above.

[0015] This utility model proposes a photovoltaic DC isolated electric switch drive circuit and a photovoltaic device. The photovoltaic DC isolated electric switch drive circuit includes: a drive module and an electric disconnect switch; the drive module is connected to the power supply terminal of the electric disconnect switch and an inverter respectively; the input terminal of the electric disconnect switch is connected to the photovoltaic panel; and the output terminal of the electric disconnect switch is connected to the inverter; the drive module is used to output a disconnect signal to the electric disconnect switch when a fault signal is received, wherein the fault signal is a signal generated by the inverter when a fault occurs; and the electric disconnect switch is used to disconnect the circuit between the photovoltaic panel and the inverter when the disconnect signal is received.

[0016] In this invention, the DC disconnect switch can be replaced with an electrically operated disconnect switch. When the drive module receives a fault signal generated by the inverter in the event of a fault, it outputs a disconnect signal to the electrically operated disconnect switch, which then disconnects the circuit between the photovoltaic panel and the inverter. Compared to existing methods that require manual disconnection of the DC disconnect switch by the user, this invention automatically controls the disconnection of the electrically operated disconnect switch through the drive module, improving the timeliness of circuit protection. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the first embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model. Figure 2The circuit diagram of the drive module in the first embodiment of the photovoltaic DC isolation electric switch drive circuit proposed in this utility model embodiment; Figure 3 This is a circuit diagram of the drive module in the second embodiment of the photovoltaic DC isolation electric switch drive circuit proposed in this utility model. Figure 4 This is an overall architecture diagram of the second embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model. Figure 5 This is a timing diagram of the second embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model. Figure 6 This is another circuit diagram of the drive module in the second embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model embodiment; Figure 7 This is another circuit schematic diagram of the drive module in the second embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model embodiment; Figure 8 The circuit diagram of the drive module in the third embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model embodiment is shown. Figure 9 This is another circuit schematic diagram of the drive module in the third embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model embodiment; Figure 10 This is another circuit diagram of the third embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model.

[0019] Explanation of icon numbers:

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0024] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0025] It should be noted that, currently, in photovoltaic power generation systems, photovoltaic panel 3 can be connected to inverter 4 via a DC disconnect switch, thereby ensuring that in the event of a fault in inverter 4, the circuit connection between photovoltaic panel 3 and inverter 4 can be disconnected via the DC disconnect switch.

[0026] However, when existing inverters 4 malfunction, users usually manually disconnect the DC isolation switch. If users are not aware of the fault in time, the manual disconnection may not be timely, resulting in low timeliness of circuit protection.

[0027] To address the aforementioned technical issues, this embodiment provides a photovoltaic DC-DC isolated electric switch drive circuit. The DC-DC isolated switch can be replaced with an electric isolated switch 2. When the drive module 1 receives a fault signal generated by the inverter 4 due to a fault, it outputs a disconnect signal to the electric isolated switch 2, which then disconnects the circuit between the photovoltaic panel 3 and the inverter 4. Compared to existing methods that require manual disconnection of the DC-DC isolated switch, this embodiment allows the drive module 1 to automatically control the disconnection of the electric isolated switch 2, improving the circuit's timely protection.

[0028] For ease of understanding, the following is combined with Figures 1 to 10 The photovoltaic DC isolated electric switch drive circuit provided in the embodiments of this utility model will be described in detail.

[0029] Reference Figure 1 , Figure 1 This is a schematic diagram of the first embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model.

[0030] like Figure 1As shown, in this embodiment, the photovoltaic DC isolation electric switch drive circuit may include: a drive module 1 and an electric isolation switch 2; The drive module 1 is connected to the power supply terminal of the electric disconnect switch 2 and the inverter 4 respectively. The input terminal of the electric disconnect switch 2 is connected to the photovoltaic panel 3, and the output terminal of the electric disconnect switch 2 is connected to the inverter 4.

[0031] It should be noted that the photovoltaic DC isolated electric switch drive circuit provided in this embodiment can be applied in a photovoltaic power generation scenario, specifically between the photovoltaic panel 3 and the inverter 4. The photovoltaic panel 3 can be any solar panel used for photovoltaic power generation, and the inverter 4 can be a device that converts the DC power generated by the photovoltaic panel 3 into AC power and outputs it to the power grid.

[0032] It should also be noted that, in this embodiment, in order to replace the traditional manual disconnection with automatic disconnection, the traditional DC disconnect switch is replaced with an electric disconnect switch 2. The electric disconnect switch 2 can be any switch that supports electric control of on / off states, and it can have four terminals: a power supply terminal, a ground terminal, an input terminal, and an output terminal. The input terminal of the electric disconnect switch 2 can be connected to the photovoltaic panel 3 to receive the DC power generated by the photovoltaic panel 3. The output terminal of the electric disconnect switch 2 can be connected to the inverter 4 to transmit the DC power to the inverter 4 for inversion. The power supply terminal and the ground terminal of the electric disconnect switch 2 can be used as the terminals for on / off control. After the ground terminal of the electric disconnect switch 2 is grounded, if the power supply terminal of the electric disconnect switch 2 receives power, the on / off control of the electric disconnect switch 2 can be achieved.

[0033] In this embodiment, a motor may be installed inside the electric disconnect switch 2. The power supply terminal and the grounding terminal of the electric disconnect switch 2 can be the power supply terminal and the grounding terminal of the motor. Therefore, if the power supply terminal of the electric disconnect switch 2 receives power, the motor can be powered and work, thereby switching the on and off states of the electric disconnect switch 2.

[0034] In this embodiment, the drive module 1 is used to output a disconnect signal to the electric disconnect switch 2 when a fault signal is received, and the fault signal is a signal generated by the inverter 4 when a fault occurs; The electric disconnect switch 2 is used to disconnect the circuit between the photovoltaic panel 3 and the inverter 4 when the disconnection signal is received.

[0035] It is understood that in this embodiment, inverter 4 can generate a fault signal when a fault occurs, and the fault may include, but is not limited to: MPPT short circuit, MPPT reverse connection, photovoltaic string reverse connection / short circuit, bus BUS+ / - ​​short circuit to BUS_N, or PV string arcing, etc. This embodiment does not limit this.

[0036] Furthermore, the inverter 4 in this embodiment can be an inverter 4 with a processor function, which can then determine whether there is a fault through the internal processor, and generate the above-mentioned fault signal when a fault occurs and transmit it to the drive module 1. For ease of subsequent explanation, this embodiment and the following implementations refer to the fault signal as Signal1.

[0037] It should be emphasized that in this embodiment, the drive module 1 can be connected to any I / O terminal of the processor in the inverter 4 to obtain the fault signal. Furthermore, the fault identification function of the processor in the inverter 4 is existing technology, and this embodiment will not elaborate on it.

[0038] In practical use, under normal circumstances, the electric disconnect switch 2 remains in the conducting state, and the DC power generated by the photovoltaic panel 3 is transmitted to the inverter 4 through the electric disconnect switch 2. When the inverter 4 detects a fault, it can output a fault signal to the drive module 1, which in turn outputs a disconnect signal to the electric disconnect switch 2. Upon receiving the disconnect signal, the electric disconnect switch 2 disconnects the circuit between the inverter 4 and the photovoltaic panel 3, thereby achieving automatic disconnection. Compared to existing systems that require manual disconnection of the DC disconnect switch by the user, this embodiment can automatically control the disconnection of the electric disconnect switch 2 through the drive module 1, improving the timeliness of circuit protection. It also reduces the scope of damage, lowers the risk of machine combustion and maintenance difficulty, protects the photovoltaic power generation site, reduces maintenance costs and inverter 4 failure losses, and can meet various application requirements, such as AFCI and RSD; the circuit design and application are highly portable and easy to promote.

[0039] Furthermore, in order to achieve the disconnection of the drive motor disconnect switch 2, refer to Figure 2 , Figure 2 This is a circuit diagram of the drive module 1 in the first embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model.

[0040] like Figure 2 As shown, in this embodiment, the driving module 1 includes: a first switching unit 11 and a first switching unit 12; The first switching unit 11 is connected to the inverter 4 and the first switching unit 12 respectively, and the first switching unit 12 is connected to the power supply of the drive power supply and the power supply terminal of the electric disconnect switch 2 respectively.

[0041] It should be understood that the aforementioned first switching unit 11 can be connected to the IO terminal of the processor in the inverter 4 used to output fault signals, in order to receive fault signals (i.e., Figure 2(Singal1). One end of the first switching unit 12 can be connected to a drive power supply. This drive power supply can be any power source that drives the motor in the electric disconnect switch 2, or it can be provided by any device capable of providing power. In this embodiment, it can be directly provided by the inverter 4. That is, in this embodiment, one end of the first switching unit 12 can be connected to the inverter 4 to access the drive power supply (i.e., Figure 2 (VCC in China).

[0042] It should also be understood that, in this embodiment, the power supply terminal of the electric disconnect switch 2 is connected to the first switching unit 12, and the grounding terminal of the electric disconnect switch 2 is grounded.

[0043] The first switching unit 11 is used to output a first switching signal to the first switching unit 12 when the fault signal is received; The first switching unit 12 is used to connect the circuit between the driving power supply and the power supply terminal of the electric disconnect switch 2 when it receives the first switching signal, so that the driving power supply transmits the disconnect signal to the electric disconnect switch 2.

[0044] It should be noted that the first switching unit 11 and the first switching unit 12 described above can be any unit with on / off switching function, such as a switching transistor. Figure 2 As shown, in this embodiment, the first switching unit 12 can be set on the circuit between the drive power supply and the power supply terminal of the electric disconnect switch 2. In actual use, after the first switching unit 11 receives a fault signal, it can first output a first switching signal to the first switching unit 12. After receiving the first switching signal, the first switching unit 12 can connect the drive power supply and the power supply terminal of the electric disconnect switch 2, so that the drive power supply can transmit a disconnect signal to the electric disconnect switch 2, so that the motor in the electric disconnect switch 2 is powered and driven, disconnecting the path between the photovoltaic panel 3 and the inverter 4.

[0045] Furthermore, in order to provide a stable power supply to the electric disconnect switch 2 and improve safety, the following continues... Figure 2 As shown, in this embodiment, the driving module 1 further includes: a first filtering unit 15; The first filtering unit 15 is connected to both the driving power supply and the first switching unit 12. The first filtering unit 15 is used to filter the disconnect signal and transmit the filtered disconnect signal to the electric disconnect switch 2 through the first switching unit 12.

[0046] It should be noted that the first filtering unit 15 mentioned above can be any unit with filtering and anti-reverse functions, such as diodes, filter capacitors, etc., and this embodiment does not limit it.

[0047] In actual use, when the first switching unit 12 receives the first switching signal, the drive power supply outputs a disconnect signal. The first filtering unit 15 filters the disconnect signal and transmits it through the first switching unit 12 to the power supply terminal of the electric disconnect switch 2 to supply power to the motor.

[0048] Furthermore, considering that in order to ensure that the motor has sufficient excitation energy to work after the fault signal disappears, in this embodiment, the drive module 1 further includes: a first locking unit 13; The first locking unit 13 is connected to the first switching unit 12 and the first switching unit 11 respectively; The first locking unit 13 is used to output a first locking signal to the first switching unit 11 when the first switching unit 12 connects the circuit between the driving power supply and the power supply terminal of the electric disconnect switch 2; The first switching unit 11 is further configured to continuously output the first switching signal to the first switching unit 12 when receiving the first locking signal, so that the first switching unit 12 continuously connects the circuit between the driving power supply and the power supply terminal of the electric disconnect switch 2.

[0049] It is understood that the first locking unit 13 can be any unit that enables the first switching unit 11 to continuously output the first switching signal.

[0050] like Figure 2 As shown, in this embodiment, the first switching unit 11 can be set to output a first switching signal at a high level. The first locking unit 13 connects the output of the first switching unit 12 with the first switching unit 11. When the first switching unit 12 outputs a disconnect signal, since the disconnect signal is at a high level, the first locking unit 13 can transmit the high-level signal as the first locking signal to the first switching unit 11. After receiving the high-level first locking signal, the first switching unit 11 can continuously output the first switching signal, thereby ensuring that the first switching unit 12 continuously receives the first switching signal to continuously connect the circuit between the driving power supply and the power supply terminal of the electric disconnect switch 2.

[0051] Furthermore, considering that existing systems typically have multiple pathways between photovoltaic panels 3 and inverters 4, multiple electric disconnect switches 2 are also provided to protect each group. If only one group experiences a short circuit or fault, only the electric disconnect switch 2 corresponding to that group needs to be disconnected, while the other pathways continue to operate normally. At this time, the drive power supply is normally powered, but the motor of the disconnected electric disconnect switch 2 cannot continuously receive power. Therefore, in this embodiment, the drive module 1 further includes: a first unlocking unit 14. The first unlocking unit 14 is connected to the inverter 4 and the first switching unit 11 respectively; The first unlocking unit 14 is used to output a first unlocking signal to the first switching unit 11 when a reset signal is received. The reset signal is a signal generated by the inverter 4 when the electric disconnecting switch 2 needs to stop receiving the disconnect signal. The first switching unit 11 is further configured to stop outputting the first switching signal to the first switching unit 12 when it receives the first unlocking signal; The first switching unit 12 is further configured to disconnect the circuit between the drive power supply and the power supply terminal of the electric disconnect switch 2 when it stops receiving the first switching signal.

[0052] It should be understood that the aforementioned reset signal can be a signal generated by the inverter 4 when a certain group of electric disconnect switches 2 is opened, and its motor needs to stop receiving the disconnection signal. For ease of explanation, the reset signal is referred to as Signal2. Exemplarily, the processor of the inverter 4 can generate and output a reset signal within a preset time after outputting a fault signal. This preset time can be the time required to ensure that the motor drive completely disconnects the electric disconnect switch 2, and can be set according to actual conditions. Furthermore, any I / O terminal on the processor of the inverter 4 can be used as a port for outputting the reset signal and connected to the first unlocking unit 14.

[0053] like Figure 2 As shown, in actual use, after receiving the reset signal, the first unlocking unit 14 can output the first unlocking signal to the first switching unit 11. The first switching unit 11 then stops outputting the first switching signal, and the first switching unit 12 disconnects the power supply of the drive power supply from the power supply terminal of the motor of the electric disconnecting switch 2. As a result, the motor stops receiving the disconnection signal and does not need to continue working.

[0054] Furthermore, such as Figure 2 As shown, in order to output the first switching signal, the first switching unit 11 includes: a first diode D1, a first resistor R1, and a first switching transistor Q1; The anode of the first diode D1 is connected to the inverter 4, the cathode of the first diode D1 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the control terminal of the first switch Q1, the input terminal of the first switch Q1 is connected to the first switching unit 12, and the output terminal of the first switch Q1 is grounded.

[0055] It should be noted that the first switching transistor Q1 mentioned above can be any switching device such as a transistor, MOSFET, optocoupler, or solid-state relay. Furthermore, the first switching transistor Q1 can be used to support high-level conduction. Figure 2 The explanation uses transistors.

[0056] like Figure 2As shown, in actual use, after the anode of the first diode D1 receives the fault signal, it can be transmitted to the control terminal of the first switch Q1. Since the fault signal is high level, the input terminal of the first switch Q1 is connected to the output terminal of the first switch Q1 and grounded, so the input terminal of the first switch Q1 is pulled low as the first switch signal and transmitted to the first switching unit 12.

[0057] Furthermore, such as Figure 2 As shown, the first switching unit 12 includes: a second resistor R2, a third resistor R3, and a second switching transistor Q2; The second end of the second resistor R2 is connected to the input end of the first switch Q1. The first end of the second resistor R2 is connected to the second end of the third resistor R3 and the control end of the second switch Q2. The first end of the third resistor R3 is connected to the first filter unit 15 and the input end of the second switch Q2. The output end of the second switch Q2 is connected to the power supply end of the electric disconnect switch 2.

[0058] Understandably, the second switch Q2 can be any switching device such as a transistor, MOSFET, optocoupler, or solid-state relay. Furthermore, the second switch Q2 can be used to support low-level conduction. Figure 2 The explanation uses transistors.

[0059] In actual use, the first switch signal can be transmitted to the control terminal of the second switch transistor Q2 through the second resistor R2. Since the first switch signal is low level, the second switch transistor Q2 is turned on, connecting the drive power supply to the power supply terminal of the electric disconnect switch 2, and outputting a disconnect signal to the electric disconnect switch 2.

[0060] Furthermore, continue as Figure 2 As shown, the first locking unit 13 includes: a fourth resistor R4; The first end of the fourth resistor R4 is connected to the output end of the second switch Q2, and the second end of the fourth resistor R4 is connected to the first end of the first resistor R1.

[0061] In actual use, when the output terminal of the second switch Q2 outputs a disconnect signal, the first locking unit 13 can transmit the high-level disconnect signal as the first locking signal to the control terminal of the first switch Q1. Therefore, the first switch Q1 can continuously conduct and output the first switching signal to the second switch Q2, and the second switch Q2 remains continuously conducting.

[0062] Furthermore, continue as Figure 2 As shown, the first unlocking unit 14 includes: a fifth resistor R5, a third switch Q3, and a sixth resistor R6; The first end of the fifth resistor R5 is connected to the inverter 4, the second end of the fifth resistor R5 is connected to the control terminal of the third switch Q3, the input terminal of the third switch Q3 is connected to the first end of the first resistor R1 and the first end of the sixth resistor R6, and the output terminal of the third switch Q3 is connected to the second end of the sixth resistor R6 and the output terminal of the first switch Q1.

[0063] It should be understood that the aforementioned third switch Q3 can be any switching device such as a transistor, MOSFET, optocoupler, or solid-state relay. Furthermore, the aforementioned third switch Q3 can be used to support high-level conduction. Figure 2 The explanation uses transistors.

[0064] In actual use, when the first end of the fifth resistor R5 receives the reset signal, since the reset signal is a high-level signal, the third switch Q3 is grounded and the input of the third switch Q3 is low-level, outputting a low-level first unlock signal. The first switch Q1 is then switched off, so the input of the first switch Q1 returns to a high level, stopping the output of the first switch signal to the second switch Q2. The second switch Q2 is disconnected, and the circuit between the drive power supply and the power supply terminal of the electric isolating switch 2 is disconnected.

[0065] Furthermore, continue as Figure 2 As shown, in this embodiment, the first filtering unit 15 includes: a second diode D2 and a first capacitor C1; The anode of the second diode D2 is connected to the driving power supply, the cathode of the second diode D2 is connected to the first terminal of the first capacitor C1 and the input terminal of the second switch Q2, and the second terminal of the first capacitor C1 is grounded.

[0066] In practical use, the second diode D2 can transmit a disconnect signal to the second switch Q2, and the second diode D2 can be used for reverse protection. The first capacitor C1 can filter the disconnect signal.

[0067] As another implementation, in this embodiment, the first switch Q1, the second switch Q2, or the third switch Q3 can be replaced with MOSFETs, and the specific connection relationships can be the same as those in the previous embodiment. Figure 2 The same applies, and this embodiment will not elaborate further.

[0068] In this embodiment, the DC disconnect switch can be replaced with an electrically operated disconnect switch 2. When the drive module 1 receives a fault signal generated when the inverter 4 malfunctions, it outputs a disconnect signal to the electrically operated disconnect switch 2, which then disconnects the circuit between the photovoltaic panel 3 and the inverter 4. Compared to the existing method that requires the user to manually disconnect the DC disconnect switch, this embodiment can automatically control the disconnection of the electrically operated disconnect switch 2 through the drive module 1, improving the timeliness of circuit protection.

[0069] Reference Figure 3 , Figure 3 The circuit diagram of the drive module 1 in the second embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model is shown.

[0070] Based on the above embodiments, a second embodiment of the present invention is proposed. As another implementation, besides... Figure 2 The electric disconnect switch 2 is driven by controlling the on / off state of its power supply terminal, and can also be driven by controlling the on / off state of its grounding terminal. Figure 3 As shown, in this embodiment, the driving module 1 includes: a second switching unit 16, a third switching unit 17, and a second switching unit 18; The second switching unit 16 is connected to the inverter 4 and the third switching unit 17 respectively. The third switching unit 17 is connected to the drive power supply, the power supply terminal of the electric disconnect switch 2 and the second switching unit 18 respectively. The second switching unit 18 is connected to the ground terminal of the electric disconnect switch 2.

[0071] It should be understood that the aforementioned second switching unit 16 can be connected to the IO terminal of the processor in the inverter 4 used to output fault signals, in order to receive fault signals (i.e., Figure 3 (Singal1). One end of the third switching unit 17 can be connected to the power supply of the drive power supply and the power supply terminal of the electric disconnect switch 2. The drive power supply can be any power supply that drives the motor in the electric disconnect switch 2, and can be provided by any device capable of providing power. In this embodiment, it can be directly provided by the inverter 4 (i.e. Figure 2 (VCC). One end of the second switching unit 18 mentioned above can be grounded.

[0072] The second switching unit 16 is used to output a second switching signal to the third switching unit 17 when the fault signal is received; The third switching unit 17 is used to output a third switching signal to the second switching unit 18 when it receives the second switching signal; The second switching unit 18 is used to connect the circuit between the ground terminal of the electric disconnect switch 2 and the reference ground when the third switching signal is received, so that the driving power supply transmits the disconnect signal to the electric disconnect switch 2.

[0073] It should be noted that the aforementioned second switching unit 16, third switching unit 17, and second switching unit 18 can be any unit with on / off switching function, such as a switching transistor. Figure 3 As shown, in this embodiment, the second switching unit 18 can be set on the loop between the grounding terminal of the disconnecting switch and the reference ground.

[0074] In actual use, after receiving a fault signal, the second switching unit 16 can first output a second switching signal to the third switching unit 17. The third switching unit 17 can output a third switching signal to the second switching unit 18. After receiving the third switching signal, the second switching unit 18 can connect the grounding terminal of the electric disconnect switch 2 with the reference ground, so that the driving power supply can transmit the disconnect signal to the electric disconnect switch 2, so that the motor in the electric disconnect switch 2 can be powered and driven to disconnect the path between the photovoltaic panel 3 and the inverter 4.

[0075] Furthermore, in order to provide a stable power supply to the electric disconnect switch 2 and improve safety, the following continues... Figure 2 As shown, in this embodiment, the driving module 1 further includes: a second filtering unit 21; The second filter unit 21 is connected to the power supply terminals of the drive power supply, the third switch unit 17, and the electric disconnect switch 2, respectively. The second filtering unit 21 is used to filter the disconnect signal and transmit the filtered disconnect signal to the electric disconnect switch 2.

[0076] It should be noted that the second filtering unit 21 mentioned above can be any unit with filtering and anti-reverse functions, such as diodes, filter capacitors, etc., and this embodiment does not limit it.

[0077] In actual use, the second filtering unit 21 filters the disconnection signal and transmits it to the power supply terminal of the electric disconnect switch 2 to supply power to the motor.

[0078] Furthermore, considering that in order to ensure that the motor has sufficient excitation energy to work after the fault signal disappears, in this embodiment, the drive module 1 further includes: a second locking unit 19; The second locking unit 19 is connected to both the third switching unit 17 and the second switching unit 16. The second locking unit 19 is used to output a second locking signal to the second switching unit 16 when the third switching unit 17 outputs the third switching signal; The second switching unit 16 is further configured to continuously output the second switching signal to the third switching unit 17 when receiving the second locking signal, so that the third switching unit 17 continuously outputs the third switching signal.

[0079] It is understood that the second locking unit 19 can be any unit that enables the second switching unit 16 to continuously output the second switching signal.

[0080] like Figure 3As shown, in this embodiment, the second switch unit 16 can be set to output a second switch signal at a high level. The second locking unit 19 connects the output of the third switch unit 17 with the second switch unit 16. When the third switch unit 17 outputs the third switch signal, since the third switch signal is at a high level, the second locking unit 19 can transmit the high-level signal as the second locking signal to the second switch unit 16. After receiving the high-level second locking signal, the second switch unit 16 can continuously output the second switch signal, thereby ensuring that the third switch unit 17 continuously receives the second switch signal and the second switching unit 18 continuously receives the third switch signal, so as to continuously connect the circuit between the grounding terminal of the electric disconnect switch 2 and the reference ground.

[0081] Furthermore, considering that existing systems typically have multiple pathways between photovoltaic panels 3 and inverters 4, multiple electric disconnect switches 2 are also provided to protect each group. If only one group experiences a short circuit or fault, only the electric disconnect switch 2 corresponding to that group needs to be disconnected, while the other pathways continue to operate normally. At this time, the drive power supply is normally powered, but the motor of the disconnected electric disconnect switch 2 cannot continuously receive power. Therefore, in this embodiment, the drive module 1 further includes a second unlocking unit 20. The second unlocking unit 20 is connected to the inverter 4 and the second switching unit 16 respectively; The second unlocking unit 20 is used to output a second unlocking signal to the second switching unit 16 when a reset signal is received. The reset signal is a signal generated by the inverter 4 when the electric disconnecting switch 2 needs to stop receiving the disconnect signal. The second switching unit 16 is further configured to stop outputting the second switching signal to the third switching unit 17 when it receives the second unlocking signal. The third switching unit 17 is also used to stop outputting the third switching signal to the second switching unit 18 when it stops receiving the second switching signal; The second switching unit 18 is also used to disconnect the circuit between the grounding terminal of the electric disconnecting switch 2 and the reference ground when it stops receiving the third switching signal.

[0082] It should be understood that the aforementioned reset signal can be a signal generated by the inverter 4 when its motor needs to stop receiving the disconnection signal after a certain group of electric disconnect switches 2 is opened. For ease of explanation, the reset signal is referred to as Signal2. For example, the processor of the inverter 4 can generate and output a reset signal within a preset time after outputting a fault signal. This preset time can be the time required to ensure that the motor drive completely disconnects the electric disconnect switch 2, and can be set according to actual conditions. Furthermore, any I / O terminal on the processor of the inverter 4 can be used as a port for outputting the reset signal and connected to the second unlocking unit 20.

[0083] like Figure 3 As shown, in actual use, after receiving the reset signal, the second unlocking unit 20 can output the second unlocking signal to the second switching unit 16. The second switching unit 16 then stops outputting the second switching signal, the third switching unit 17 stops outputting the third switching signal, and the second switching unit 18 disconnects the grounding terminal of the motor of the electric disconnecting switch 2 from the reference ground, so that the motor stops receiving the disconnection signal and does not need to continue working.

[0084] Furthermore, such as Figure 3 As shown, in order to output the second switching signal, the second switching unit 16 includes: a third diode D3, a seventh resistor R7, and a fourth switching transistor Q4; The anode of the third diode D3 is connected to the inverter 4, the cathode of the third diode D3 is connected to the first end of the seventh resistor R7, the second end of the seventh resistor R7 is connected to the control terminal of the fourth switch Q4, the input terminal of the fourth switch Q4 is connected to the third switch unit 17, and the output terminal of the fourth switch Q4 is grounded.

[0085] It should be noted that the aforementioned fourth switch Q4 can be any switching device, such as a transistor, MOSFET, optocoupler, or solid-state relay. Furthermore, the aforementioned fourth switch Q4 can be used to support high-level conduction. Figure 3 The explanation uses transistors.

[0086] like Figure 3 As shown, in actual use, after the anode of the third diode D3 receives the fault signal, it can be transmitted to the control terminal of the fourth switch Q4. Since the fault signal is high level, the input terminal and the output terminal of the fourth switch Q4 are connected to ground, thereby pulling the input terminal of the fourth switch Q4 low as the second switch signal to be transmitted to the third switch unit 17.

[0087] Furthermore, such as Figure 3 As shown, the third switching unit 17 includes: an eighth resistor R8, a ninth resistor R9, and a fifth switching transistor Q5. The second end of the eighth resistor R8 is connected to the input end of the fourth switch Q4. The first end of the eighth resistor R8 is connected to the second end of the ninth resistor R9 and the control end of the fifth switch Q5. The first end of the ninth resistor R9 is connected to the second filter unit 21 and the input end of the fifth switch Q5. The output end of the fifth switch Q5 is connected to the second switching unit 18. The power supply end of the electric disconnect switch 2 is directly connected to the drive power supply through the second filter unit 21.

[0088] Understandably, the aforementioned fifth switch Q5 can be any switching device such as a transistor, MOSFET, optocoupler, or solid-state relay. Furthermore, the aforementioned fifth switch Q5 can be used to support low-level conduction. Figure 3 The explanation uses transistors.

[0089] In actual use, the second switch signal can be transmitted to the control terminal of the fifth switch transistor Q5 through the eighth resistor R8. Since the second switch signal is at a low level, the fifth switch transistor Q5 is turned on and outputs the third switch signal to the second switching unit 18.

[0090] Furthermore, continue as Figure 3 As shown, the second switching unit 18 includes: an eleventh resistor R11, a twelfth resistor R12, and a sixth switch Q6; The first end of the eleventh resistor R11 is connected to the output terminal of the fifth switch Q5. The second end of the eleventh resistor R11 is connected to the first end of the twelfth resistor R12 and the control terminal of the sixth switch Q6. The output terminal of the sixth switch Q6 is connected to the second end of the twelfth resistor R12 and the output terminal of the fourth switch Q4.

[0091] Understandably, the aforementioned sixth switch Q6 can be any switching device, such as a transistor, MOSFET, optocoupler, or solid-state relay. Furthermore, the aforementioned sixth switch Q6 can be used to support high-level conduction. Figure 3 The explanation uses a MOSFET.

[0092] In practical use, refer to Figure 4 as well as Figure 5 , Figure 4 This is an overall architecture diagram of the second embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model. Figure 5 This is a timing diagram of the second embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model. Figure 4 M represents electric disconnect switch 2, and S represents... Figure 3 The sixth switch, Q6, is used in the circuit, and the logic circuit consists of the remaining parts excluding Q6. During the time period T0 to T1, inverter 4 operates normally, and the port outputting the fault signal is at a low level (i.e.,...). Figure 5(Signal1 is low) At time T1, inverter 4 detects a fault and outputs a fault signal during the period from T1 to T2 (i.e., Signal1 is low). Figure 5 (Signal1 is high level). After the eleventh resistor R11 receives the third switch signal, it can transmit it to the control terminal of the sixth switch Q6. Since the third switch signal is high level, the control terminal of the sixth switch Q6 becomes high level (i.e., Figure 5 When S1-Gate is high, the sixth switch Q6 is turned on, therefore the input of the sixth switch Q6 becomes low (i.e., Figure 5 When the voltage of S1 becomes low, the grounding terminal of the electric disconnector 2 is connected to ground, and the electric disconnector 2 starts to work.

[0093] Furthermore, continue as Figure 3 As shown, the second locking unit 19 includes: a tenth resistor R10; The first end of the tenth resistor R10 is connected to the output end of the fifth switch Q5, and the second end of the tenth resistor R10 is connected to the first end of the seventh resistor R7.

[0094] In actual use, when the output terminal of the fifth switch transistor Q5 outputs the third switch signal, the second locking unit 19 can transmit the high-level third switch signal as the second locking signal to the control terminal of the fourth switch transistor Q4. Therefore, the fourth switch transistor Q4 can continuously conduct and output the second switch signal to the fifth switch transistor Q5, and the fifth switch transistor Q5 remains continuously on.

[0095] Furthermore, continue as Figure 3 As shown, the second unlocking unit 20 includes: a thirteenth resistor R13, a seventh switch Q7, and a fourteenth resistor R14; The first end of the thirteenth resistor R13 is connected to inverter 4, the second end of the thirteenth resistor R13 is connected to the control terminal of the seventh switch Q7, the input terminal of the seventh switch Q7 is connected to the first end of the seventh resistor R7 and the first end of the fourteenth resistor R14, and the output terminal of the seventh switch Q7 is connected to the second end of the fourteenth resistor R14 and the output terminal of the fourth switch Q4.

[0096] It should be understood that the aforementioned seventh switch Q7 can be any switching device such as a transistor, MOSFET, optocoupler, or solid-state relay. Furthermore, the aforementioned seventh switch Q7 can be used to support high-level conduction. Figure 3 The explanation uses transistors.

[0097] In actual use, continue as follows Figure 3 as well as Figure 5 As shown, when the first terminal of the thirteenth resistor R13 receives a reset signal during the time period T3 to T4, since the reset signal is a high-level signal (i.e., Figure 5 (Signal2 is high), thus the seventh switch Q7 is grounded, the input of the seventh switch Q7 is low, and the output of the second unlock signal is low. The fourth switch Q4 is switched off, thus the input of the fourth switch Q4 returns to high, stopping the output of the second switch signal to the fifth switch Q5. The fifth switch Q5 is off, stopping the output of the third switch signal to the sixth switch Q6. The control terminal of the sixth switch Q6 becomes low (i.e.,...). Figure 5 When S1-Gate is low, the sixth switch Q6 is open, and the circuit between the ground terminal of the electric disconnect switch 2 and the reference ground is broken (i.e., Figure 5 (S1 Voltage is high).

[0098] During the T4-T5 time period, drive module 1 is in a reset and unlock state. If the drive power supply is still normal, drive module 1 is unlocked, and the input of the sixth switch Q6 becomes low. During this period, the motor of the disconnected switch will not be continuously powered and will wait for manual inspection and manual reset.

[0099] Furthermore, continue as Figure 3 As shown, in this embodiment, the second filter unit 21 includes: a fourth diode D4 and a second capacitor C2; The anode of the fourth diode D4 is connected to the driving power supply, the cathode of the fourth diode D4 is connected to the first terminal of the second capacitor C2, the power supply terminal of the electric disconnect switch 2, and the input terminal of the fifth switch Q5, and the second terminal of the second capacitor C2 is grounded.

[0100] In practical use, the fourth diode D4 can transmit a disconnect signal to the electric disconnect switch 2 and provide a high level to the fifth switch Q5. The fourth diode D4 can also be used for reverse protection, and the second capacitor C2 can filter the disconnect signal.

[0101] As another implementation method, refer to Figure 6 as well as Figure 7 , Figure 6 This is another circuit diagram of the drive module 1 in the second embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model. Figure 7 This is another circuit diagram of the drive module 1 in the second embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model embodiment, as shown below. Figure 6 As shown, in this embodiment, the fifth switch Q5 can also be replaced with a MOSFET, and the specific connection relationship can be the same as... Figure 3 The same applies, and this embodiment will not elaborate further; such as Figure 7 As shown, in this embodiment, the fourth switch Q4, the fifth switch Q5, and the seventh switch Q7 can also be replaced with MOSFETs, and the specific connection relationships can be the same as those shown. Figure 3 The same applies, and this embodiment will not elaborate further.

[0102] Reference Figure 8 , Figure 8 The circuit diagram of the drive module 1 in the third embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model is shown.

[0103] Based on the above embodiments, a third embodiment of the present invention is proposed as another implementation of the second embodiment, such as... Figure 8 As shown, in this embodiment, the driving module 1 further includes: a third locking unit 22; The third locking unit 22 is connected to the third switching unit 17 and the second switching unit 16 respectively; The third locking unit 22 is used to output a third locking signal to the third switching unit 17 when the third switching unit 17 outputs the third switching signal; The third switching unit 17 is also used to continuously output the third switching signal to the second switching unit 18 when the third locking signal is received.

[0104] like Figure 8 As shown, another locking method can also be used in this embodiment, that is, the third locking unit 22 is directly connected to the third switching unit 17. When the third switching unit 17 outputs the third switching signal, the third locking unit 22 can directly output a low-level third locking signal to the third switching unit 17, thereby ensuring that the third switching unit 17 can continuously output the third switching signal.

[0105] Furthermore, in order to unlock the third locking unit 22, the drive module 1 also includes a third unlocking unit 23; The third unlocking unit 23 is connected to the inverter 4 and the third locking unit 22 respectively; The third unlocking unit 23 is used to output a third unlocking signal to the third locking unit 22 when a reset signal is received. The reset signal is a signal generated by the inverter 4 when the electric disconnecting switch 2 needs to stop receiving the disconnect signal. The third locking unit 22 is also used to stop outputting the third locking signal to the third switching unit 17 when the third unlocking signal is received; The third switching unit 17 is also used to stop outputting the third switching signal to the second switching unit 18 when it stops receiving the third locking signal; The second switching unit 18 is also used to disconnect the circuit between the grounding terminal of the electric disconnecting switch 2 and the reference ground when it stops receiving the third switching signal.

[0106] It should be understood that the aforementioned reset signal can be a signal generated by the inverter 4 when its motor needs to stop receiving the disconnection signal after a certain group of electric disconnect switches 2 is opened. For ease of explanation, the reset signal is referred to as Signal2. Exemplarily, the processor of the inverter 4 can generate and output a reset signal within a preset time after outputting a fault signal. This preset time can be the time required to ensure that the motor drive completely disconnects the electric disconnect switch 2, and can be set according to actual conditions. Furthermore, any I / O terminal on the processor of the inverter 4 can be used as a port for outputting the reset signal and connected to the third unlocking unit 23.

[0107] like Figure 3 As shown, in actual use, after receiving the reset signal, the third unlocking unit 23 can output the third unlocking signal to the third locking unit 22, and the third locking unit 22 will stop outputting the third locking signal. The third switching unit 17 will stop outputting the third switching signal, and the second switching unit 18 will disconnect the grounding terminal of the motor of the electric disconnecting switch 2 from the reference ground, so that the motor stops receiving the disconnection signal and does not need to continue working.

[0108] Furthermore, such as Figure 8 As shown, in this embodiment, the second switching unit 16 includes: a fifteenth resistor R15 and an eighth switching transistor Q8; The first end of the fifteenth resistor R15 is connected to the inverter, the second end of the fifteenth resistor R15 is connected to the control terminal of the eighth switch Q8, the input terminal of the eighth switch Q8 is connected to the first end of the eighth resistor, and the output terminal of the eighth switch Q8 is connected to the output terminal of the ninth switch Q9.

[0109] The eighth switch Q8 mentioned above can be a transistor that conducts at a high level. In actual use, the eighth switch Q8 can be turned on after receiving a reset signal.

[0110] It should be emphasized that the specific implementation methods and connection relationships of the third switching unit 17, the second switching unit 18 and the second filtering unit 21 in this embodiment can be referred to the description in the second embodiment, and will not be repeated in this embodiment.

[0111] Furthermore, such as Figure 8 As shown, in this embodiment, the third locking unit 22 includes: a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, and a ninth switch Q9; The first end of the sixteenth resistor R16 is connected to the output terminal of the fifth switch Q5. The second end of the sixteenth resistor R16 is connected to the first end of the seventeenth resistor R17 and the first end of the eighteenth resistor R18. The second end of the seventeenth resistor R17 is connected to the control terminal of the ninth switch Q9. The input terminal of the ninth switch Q9 is connected to the second end of the eighth resistor R8. The output terminal of the ninth switch Q9 is connected to the second end of the eighteenth resistor R18. The output terminal of the ninth switch Q9 is also grounded.

[0112] It should be noted that the aforementioned ninth switch Q9 can be any switching device, such as a transistor, MOSFET, optocoupler, or solid-state relay. Furthermore, the aforementioned ninth switch Q9 can be used to support high-level conduction. Figure 8 The explanation uses transistors.

[0113] In practical use, the sixteenth resistor R16 transmits the high-level third switch signal to the control terminal of the ninth switch Q9. The ninth switch Q9 turns on, which in turn grounds the control terminal of the fifth switch Q5. The ninth switch Q9 outputs a low-level third lock signal to the fifth switch Q5, thereby enabling the fifth switch Q5 to continuously output the third switch signal.

[0114] Furthermore, the third unlocking unit 23 includes: a nineteenth resistor R19 and a tenth switching transistor; The first end of the nineteenth resistor R19 is connected to inverter 4, the second end of the nineteenth resistor R19 is connected to the control terminal of the tenth switch transistor, the input terminal of the tenth switch transistor is connected to the first end of the seventeenth resistor R17, and the output terminal of the tenth switch transistor is connected to the second end of the eighteenth resistor R18.

[0115] It should be understood that the aforementioned tenth switch can be any switching device, such as a transistor, MOSFET, optocoupler, or solid-state relay. Furthermore, the aforementioned tenth switch can be used to support high-level conduction. Figure 8 The explanation uses transistors.

[0116] In actual use, when the first terminal of the nineteenth resistor R19 receives a reset signal, since the reset signal is a high-level signal, the tenth switch is grounded and the input terminal of the tenth switch is low-level, outputting a low-level third unlock signal. The ninth switch Q9 then switches to open, and the input terminal of the ninth switch Q9 returns to a high level, stopping the output of the third lock signal to the fifth switch Q5. The fifth switch Q5 is open, stopping the output of the third switch signal to the sixth switch Q6. The sixth switch Q6 is open, and the circuit between the ground terminal of the electric disconnect switch 2 and the reference ground is broken.

[0117] Reference Figure 9 , Figure 9This is another circuit diagram of the drive module 1 in the third embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model.

[0118] It should be emphasized that the specific implementation methods and connection relationships of the third switching unit 17, the second switching unit 18, the second filtering unit 21, the third locking unit 22, and the third unlocking unit 23 in this embodiment can be found in the following descriptions. Figure 8 The descriptions in the corresponding embodiments will not be repeated in this embodiment.

[0119] As another implementation method, in order to achieve this through an optocoupler, in this embodiment, the second switching unit 16 includes: a twentieth resistor R20, an optocoupler G, and a twenty-first resistor R21; The first end of the twentieth resistor R20 is connected to inverter 4. The second end of the twentieth resistor R20 is connected to the anode of the photodiode in optocoupler G. The cathode of the photodiode in optocoupler G is connected to the second end of the twentieth resistor R21. The first end of the twentieth resistor R21 is connected to the power supply. The input end of the phototransistor in optocoupler G is connected to the second end of the eighth resistor R8. The output end of the phototransistor in optocoupler G is connected to the second end of the eighteenth resistor R18.

[0120] In actual use, when the twentieth resistor R20 receives a fault signal, the photodiode can emit light and the phototransistor can conduct, thereby outputting a low-level second switching signal to the fifth switching transistor Q5.

[0121] As another implementation method, refer to Figure 10 , Figure 10 This is another circuit schematic diagram of the third embodiment of the photovoltaic DC isolated electric switch drive circuit proposed in this utility model. When no reset signal is set, it can be directly based on... Figure 3 Simply remove the second unlocking unit 20 to form... Figure 10 The format and other specific connections can be referenced. Figure 3 This embodiment will not elaborate on this point.

[0122] To achieve the above objectives, this utility model also proposes a photovoltaic device, which includes: Photovoltaic panel 3, inverter 4, and photovoltaic DC isolated electric switch drive circuit as described above.

[0123] It should be noted that the specific implementation methods of the photovoltaic equipment provided in this embodiment can all refer to the above embodiments, and this embodiment will not elaborate on them. Therefore, the effects achieved by the photovoltaic equipment in this embodiment can also refer to the above embodiments, and this embodiment will not elaborate on them either.

[0124] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A photovoltaic DC isolated electric switch drive circuit, characterized in that, The photovoltaic DC isolation electric switch drive circuit includes: a drive module and an electric isolation switch; The drive module is connected to the power supply terminal of the electric disconnect switch and the inverter respectively. The input terminal of the electric disconnect switch is connected to the photovoltaic panel, and the output terminal of the electric disconnect switch is connected to the inverter. The drive module is used to output a disconnect signal to the electric disconnect switch when a fault signal is received, wherein the fault signal is a signal generated by the inverter when a fault occurs. The electric disconnect switch is used to disconnect the circuit between the photovoltaic panel and the inverter when the disconnection signal is received.

2. The photovoltaic DC isolated electric switch drive circuit as described in claim 1, characterized in that, The drive module includes: a first switch unit and a first switching unit; The first switching unit is connected to the inverter and the first switching unit respectively, and the first switching unit is connected to the power supply of the drive power supply and the power supply terminal of the electric disconnect switch respectively. The first switching unit is configured to output a first switching signal to the first switching unit when the fault signal is received; The first switching unit is configured to, upon receiving the first switching signal, connect the circuit between the driving power supply and the power supply terminal of the electric disconnect switch, so that the driving power supply transmits a disconnect signal to the electric disconnect switch.

3. The photovoltaic DC isolated electric switch drive circuit as described in claim 2, characterized in that, The drive module further includes: a first locking unit; The first locking unit is connected to both the first switching unit and the first switch unit. The first locking unit is used to output a first locking signal to the first switching unit when the first switching unit connects the circuit between the driving power supply and the power supply terminal of the electric disconnect switch; The first switching unit is further configured to continuously output the first switching signal to the first switching unit when receiving the first locking signal, so that the first switching unit continuously connects the circuit between the driving power supply and the power supply terminal of the electric disconnect switch.

4. The photovoltaic DC isolated electric switch drive circuit as described in claim 3, characterized in that, The driving module further includes: a first unlocking unit; The first unlocking unit is connected to both the inverter and the first switching unit. The first unlocking unit is used to output a first unlocking signal to the first switching unit when a reset signal is received, wherein the reset signal is a signal generated by the inverter when the electric disconnecting switch needs to stop receiving the disconnect signal; The first switching unit is further configured to stop outputting the first switching signal to the first switching unit when it receives the first unlocking signal; The first switching unit is further configured to disconnect the circuit between the drive power supply and the power supply terminal of the electric disconnect switch when it stops receiving the first switching signal.

5. The photovoltaic DC isolated electric switch drive circuit as described in claim 1, characterized in that, The drive module includes: a second switch unit, a third switch unit, and a second switching unit; The second switching unit is connected to the inverter and the third switching unit respectively. The third switching unit is connected to the drive power supply, the power supply terminal of the electric disconnect switch and the second switching unit respectively. The second switching unit is connected to the ground terminal of the electric disconnect switch. The second switching unit is configured to output a second switching signal to the third switching unit when the fault signal is received; The third switching unit is used to output a third switching signal to the second switching unit when it receives the second switching signal; The second switching unit is used to connect the circuit between the grounding terminal of the electric disconnect switch and the reference ground when the third switching signal is received, so that the drive power supply transmits the disconnect signal to the electric disconnect switch.

6. The photovoltaic DC isolated electric switch drive circuit as described in claim 5, characterized in that, The drive module further includes: a second locking unit; The second locking unit is connected to both the third switching unit and the second switching unit. The second locking unit is used to output a second locking signal to the second switching unit when the third switching unit outputs the third switching signal; The second switching unit is further configured to continuously output the second switching signal to the third switching unit when receiving the second locking signal, so that the third switching unit continuously outputs the third switching signal.

7. The photovoltaic DC isolated electric switch drive circuit as described in claim 6, characterized in that, The driving module further includes: a second unlocking unit; The second unlocking unit is connected to both the inverter and the second switching unit. The second unlocking unit is used to output a second unlocking signal to the second switching unit when a reset signal is received. The reset signal is a signal generated by the inverter when the electric disconnecting switch needs to stop receiving the disconnect signal. The second switching unit is further configured to stop outputting the second switching signal to the third switching unit upon receiving the second unlocking signal. The third switching unit is further configured to stop outputting the third switching signal to the second switching unit when it stops receiving the second switching signal; The second switching unit is further configured to disconnect the circuit between the grounding terminal of the electric disconnecting switch and the reference ground when it stops receiving the third switching signal.

8. The photovoltaic DC isolated electric switch drive circuit as described in claim 5, characterized in that, The drive module further includes: a third locking unit; The third locking unit is connected to both the third switching unit and the second switching unit; The third locking unit is used to output a third locking signal to the third switching unit when the third switching unit outputs the third switching signal; The third switching unit is also configured to continuously output the third switching signal to the second switching unit when the third locking signal is received.

9. The photovoltaic DC isolated electric switch drive circuit as described in claim 8, characterized in that, The driving module further includes: a third unlocking unit; The third unlocking unit is connected to both the inverter and the third locking unit. The third unlocking unit is used to output a third unlocking signal to the third locking unit when a reset signal is received. The reset signal is a signal generated by the inverter when the electric disconnect switch needs to stop receiving the disconnect signal. The third locking unit is further configured to stop outputting the third locking signal to the third switching unit when the third unlocking signal is received; The third switching unit is also used to stop outputting the third switching signal to the second switching unit when it stops receiving the third locking signal; The second switching unit is further configured to disconnect the circuit between the grounding terminal of the electric disconnecting switch and the reference ground when it stops receiving the third switching signal.

10. A photovoltaic device, characterized in that, The photovoltaic equipment includes: a photovoltaic panel, an inverter, and a photovoltaic DC isolated electric switch drive circuit as described in any one of claims 1 to 9.

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