CN206559307U - A kind of photovoltaic DC anti-reverse device - Google Patents
A kind of photovoltaic DC anti-reverse device Download PDFInfo
- Publication number
- CN206559307U CN206559307U CN201720126615.8U CN201720126615U CN206559307U CN 206559307 U CN206559307 U CN 206559307U CN 201720126615 U CN201720126615 U CN 201720126615U CN 206559307 U CN206559307 U CN 206559307U
- Authority
- CN
- China
- Prior art keywords
- photovoltaic
- group string
- power supply
- photovoltaic group
- reverse device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000004065 semiconductor Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Photovoltaic Devices (AREA)
Abstract
The utility model provides a kind of photovoltaic DC anti-reverse device, is connected by driving power supply with the output end of photovoltaic group string, when the output voltage of photovoltaic group string is not enough, and linear stabilized power supply or DC/DC Switching Power Supplies, being capable of the disconnections of controlling switch device as driving power supply；Because switching device is arranged between photovoltaic group string and inverter direct-flow side, after switching device disconnects, photovoltaic group string can be avoided to receive reverse current, and then avoid the permanent damage of photovoltaic module in active loss and photovoltaic group string of the inverter when night SVG is run；Simultaneously as increasing counnter attack diode not in main circuit, therefore prior art is avoided because diode forward conduction voltage drop brings the problem of system generated energy loses.
Description
Technical field
The utility model is related to technical field of photovoltaic power generation, more particularly to a kind of photovoltaic DC anti-reverse device.
Background technology
General connected by multiple photovoltaic modulies forms photovoltaic group string in grid-connected photovoltaic system, to obtain higher direct current
Voltage；Photovoltaic module in photovoltaic group string generates positive direct current energy, exchange is reverse into by inverter when receiving illumination
Electric energy sends into power network.
At night, photovoltaic group string output voltage is essentially 0, if now inverter is according to SVG (Static Var
Generating, static reacance occurs) function operation, higher DC voltage can be formed in photovoltaic DC side, if the voltage is super
The breakdown reverse voltage of photovoltaic group string is crossed, reverse electric current can be formed on photovoltaic module.Reverse current can increase inverter and exist
Night SVG run when active loss, in addition larger reverse current be likely to result in photovoltaic module it is permanent damage.
Prior art typically prevents light to prevent above-mentioned phenomenon from occurring by increasing counnter attack diode in main circuit
Lie prostrate component and receive reverse current, but be due to that diode forward conduction voltage drop is larger, can be caused in photovoltaic module normal power generation
The loss for the system generated energy that can not ignore.
Utility model content
In view of this, the utility model provides a kind of photovoltaic DC anti-reverse device, to solve in the prior art due to two
Pole pipe forward conduction voltage drop brings the problem of system generated energy loses.
To achieve the above object, the technical scheme that the application is provided is as follows：
A kind of photovoltaic DC anti-reverse device, including：Driving power supply and switching device；Wherein：
The input of the driving power supply is connected with the output end of photovoltaic group string；
The output end of the driving power supply is connected with the control end of the switching device；
The switching device is arranged between the photovoltaic group string and inverter direct-flow side；
The driving power supply is linear stabilized power supply, or is DC/DC Switching Power Supplies.
It is preferred that, the driving power supply includes the multistage linear voltage-stabilized power supply of series connection.
It is preferred that, the photovoltaic DC anti-reverse device also includes：Telecommunication circuit；
The input of the telecommunication circuit receives external control instruction；
The output end of the telecommunication circuit is connected with the control end of the switching device.
It is preferred that, the input of the driving power supply is connected with the output end of the photovoltaic group string after header box confluxes.
It is preferred that, the photovoltaic DC anti-reverse device is integrated in inverter.
It is preferred that, the photovoltaic DC anti-reverse device is integrated in header box, the header box and N number of photovoltaic group string
It is connected；N is the positive integer more than 1；
The input of the driving power supply is connected with the output end of any photovoltaic group string in N number of photovoltaic group string；
The photovoltaic DC anti-reverse device also includes：N-1 switching device；
A switch is each provided between the output end and the inverter direct-flow side of each photovoltaic group string
Device；
Output end of the control end of N number of switching device with the driving power supply is connected.
It is preferred that, the photovoltaic DC anti-reverse device also includes：N number of diode；
Positive pole of the anode of N number of diode respectively with N number of photovoltaic group string is connected；
The negative electrode of N number of diode is connected, and the negative electrode common point being formed by connecting and the input of the driving power supply are rectified
Extremely it is connected.
It is preferred that, N number of photovoltaic DC anti-reverse device is integrated in header box, the header box and N number of photovoltaic
Group string is connected；N is the positive integer more than 1；
N number of photovoltaic DC anti-reverse device is connected with N number of photovoltaic group string respectively.
It is preferred that, the switching device is arranged between the positive pole of the photovoltaic group string and inverter direct-flow side positive pole；
Or, the switching device is arranged between the negative pole of the photovoltaic group string and inverter direct-flow side negative pole；
Or, the switching device includes：Two switches；One switchs positive pole and the inversion for being arranged at the photovoltaic group string
Between device DC side positive pole, another switch is arranged between the negative pole of the photovoltaic group string and inverter direct-flow side negative pole.
It is preferred that, the switching device is electronically controlled mechanical switch, or, controllable semiconductor switch.
The photovoltaic DC anti-reverse device provided from such scheme, the utility model, passes through driving power supply and photovoltaic group
The output end of string is connected, and when the output voltage of photovoltaic group string is not enough, linear stabilized power supply or DC/DC Switching Power Supplies are used as drive
Dynamic power supply, being capable of the disconnection of controlling switch device；Because switching device is arranged between photovoltaic group string and inverter direct-flow side, when opening
Close after device disconnection, photovoltaic group string can be avoided to receive reverse current, and then from avoiding inverter active when night SVG is run
Photovoltaic module is permanent in loss and photovoltaic group string damages；Simultaneously as increasing counnter attack diode not in main circuit, therefore
Prior art is avoided because diode forward conduction voltage drop brings the problem of system generated energy loses.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used required in description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
The structural representation for the photovoltaic DC anti-reverse device that Fig. 1 provides for the utility model embodiment；
The structural representation for the photovoltaic DC anti-reverse device that Fig. 2 provides for the utility model embodiment；
The structural representation for the photovoltaic DC anti-reverse device that Fig. 3 provides for the utility model embodiment；
The structural representation for the photovoltaic DC anti-reverse device that Fig. 4 provides for the utility model embodiment；
The structural representation for the photovoltaic DC anti-reverse device that Fig. 5 provides for the utility model embodiment；
The structural representation for the photovoltaic DC anti-reverse device that Fig. 6 provides for the utility model embodiment；
The structural representation for the photovoltaic DC anti-reverse device that Fig. 7 provides for the utility model embodiment；
The connection diagram for the photovoltaic DC anti-reverse device that Fig. 8 provides for the utility model embodiment；
The connection diagram for the photovoltaic DC anti-reverse device that Fig. 9 provides for the utility model embodiment；
The connection diagram for the photovoltaic DC anti-reverse device that Figure 10 provides for the utility model embodiment；
The connection diagram for the photovoltaic DC anti-reverse device that Figure 11 provides for the utility model embodiment；
The structural representation for the photovoltaic DC anti-reverse device that Figure 12 provides for the utility model embodiment；
The structural representation for the photovoltaic DC anti-reverse device that Figure 13 provides for the utility model embodiment；
The structural representation for the photovoltaic DC anti-reverse device that Figure 14 provides for the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
The utility model provides a kind of photovoltaic DC anti-reverse device, to solve in the prior art because diode forward is led
Logical pressure drop brings the problem of system generated energy loses.
Specifically, the photovoltaic DC anti-reverse device, referring to Fig. 1, including：Driving power supply 100 and switching device 200；Wherein：
The input of driving power supply 100 is connected with the output end of photovoltaic group string；
The output end of driving power supply 100 is connected with the control end of switching device 200；
Switching device 200 is arranged between photovoltaic group string and inverter direct-flow side；
Driving power supply 100 is linear stabilized power supply, or is DC/DC Switching Power Supplies.
Specifically operation principle is：
When the output voltage of photovoltaic group string exceedes the startup voltage of driving power supply 100, driving power supply 100 normally starts,
Controlling switch device 200 is closed so that connected between photovoltaic group string and inverter direct-flow side.
When the output voltage of photovoltaic group string is less than the maintenance working voltage of driving power supply 100, driving power supply 100 stops work
Make, the control end power-off of switching device 200, therefore switching device 200 disconnects；After switching device 200 disconnects, inverter according to
When SVG functions are run the DC voltage that is formed on photovoltaic DC side will not be applied in photovoltaic group string, it is to avoid photovoltaic group string
Reverse current is received, and then avoids photovoltaic module in active loss and photovoltaic group string of the inverter when night SVG is run permanent
The damage of property.
In specific practical application, driving power supply 100 can be linear stabilized power supply, referring to Fig. 2；Or driving power supply
100 can also be DC/DC Switching Power Supplies, and the main topology of the inverse-excitation type switch power-supply as shown in Fig. 3, Fig. 5 to Fig. 7, complete is anti-
Excitation type switch power-supply also includes control chip, chip start-up circuit and feedback winding power supply circuit, output voltage benchmark and feedback
Circuit, some protection circuits etc., are prior art, here is omitted；Fig. 2, Fig. 3, Fig. 5 are a kind of example to Fig. 7, are driven
The form that implements of dynamic power supply 100 is not limited to this, can also be selected according to its concrete application environment, in this Shen
In protection domain please.
Because switching device 200 is arranged between photovoltaic group string and inverter direct-flow side, to its particular location not
It is specifically limited, such as, switching device 200 is arranged between the positive pole of photovoltaic group string and inverter direct-flow side positive pole；Referring to Fig. 1
To Fig. 5.
Or, switching device 200 is arranged between the negative pole of photovoltaic group string and inverter direct-flow side negative pole；Referring to Fig. 6.
Or, switching device 200 includes：Two switches；The positive pole and inverter that one switch is arranged at photovoltaic group string are straight
Flow between the positive pole of side, another switch is arranged between the negative pole of photovoltaic group string and inverter direct-flow side negative pole；Referring to Fig. 7.
It is preferred that, switching device 200 be electronically controlled mechanical switch, such as relay, contactor, such as Fig. 2 to Fig. 4 and
Shown in Fig. 6, switching device 200 is electromagnetic relay；Or, switching device 200 can also be controllable semiconductor switch, such as
IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), SCR (Silicon
Controlled Rectifier, silicon controlled rectifier (SCR)) and Fig. 5 shown in MOSFET (Metal-Oxide-
Semiconductor Field Effect Transistor, mos field effect transistor) etc..
The photovoltaic DC anti-reverse device that the present embodiment is provided, increases counnter attack diode not in main circuit, and can lead to
Above-mentioned principle is crossed, when the output voltage of photovoltaic group string is not enough, drive is used as by linear stabilized power supply or DC/DC Switching Power Supplies
Dynamic power supply 100, controlling switch device 200 disconnects, so as to avoid photovoltaic group string from receiving reverse current, and then avoids inverter at night
Between SVG run when active loss and photovoltaic group string in photovoltaic module it is permanent damage；Therefore avoid prior art due to
Diode forward conduction voltage drop brings the problem of system generated energy loses.
In addition, also there is a kind of digital control scheme in the prior art, by comparing DC side voltage of converter and light
The output voltage of volt group string, when DC side voltage of converter is higher than the output voltage of photovoltaic group string, disconnects company between the two
Connect；But the program needs complicated digital control circuit, adds the infrastructure cost of anti-reverse device.
And the present embodiment is used as driving power supply 100, controlling switch dress by linear stabilized power supply or DC/DC Switching Power Supplies
Put 200 anti-reflection functions that photovoltaic group strings can be achieved, compared with prior art in digital control scheme, its circuit structure is simple,
Cost is low, and reliability is high.
In specific practical application, because the input and output pressure drop of driving power supply 100 is larger, therefore, work as driving power supply
100 be linear stabilized power supply when, it would however also be possible to employ the mode of multistage linear power sources in series, to reduce single linear power supply switching tube
On voltage and power consumption, the output voltage of prime is more than the output voltage of rear class in multistage linear voltage-stabilized power supply.
Therefore, when driving power supply 100 is linear stabilized power supply, it is preferred that driving power supply 100 includes the multistage line of series connection
Property voltage-stabilized power supply.
Referring to Fig. 4, driving power supply 100 is composed in series using two-stage linear stabilized power supply.
It is preferred that, photovoltaic DC anti-reverse device also includes：Telecommunication circuit；
The input of telecommunication circuit receives external control instruction；
The output end of telecommunication circuit is connected with the control end of switching device 200.
Telecommunication circuit is also capable of turning on and off for controlling switch device 200, is inversion by receiving external control instruction
Break-make between device and photovoltaic group string provides a kind of manual control mode, and being applied to detection of system etc., other are operated.
In grid-connected photovoltaic system：
When inverter is group string inverter, the connection of multiple photovoltaic DC anti-reverse devices and photovoltaic group string and inverter
Relation is referring to Fig. 8.
When inverter is concentrated inverter, inverter direct-flow side is typically provided with header box, now, and multiple photovoltaics are straight
Anti-reverse device is flowed with photovoltaic group string and the annexation of inverter referring to Fig. 9；That is, the driving power supply 100 in above-described embodiment
Input be connected with the output end of the photovoltaic group string after header box confluxes.
In addition, the photovoltaic DC anti-reverse device can be separately provided in grid-connected photovoltaic system, also can be integrally disposed
In other equipment, such as, the photovoltaic DC anti-reverse device can also be integrated in inverter；Now, inverter includes the light
Direct current anti-reverse device and DC/AC Converting Units are lied prostrate, as shown in Figure 10.
Or, when inverter is concentrated inverter, photovoltaic DC anti-reverse device can also be integrated in header box, converged
Stream case is connected with N number of photovoltaic group string, referring to Figure 11；N is the positive integer more than 1；
The input of driving power supply 100 is connected with the output end of any photovoltaic group string in N number of photovoltaic group string；
Photovoltaic DC anti-reverse device also includes：N-1 switching device 200；
A switching device 200 is each provided between the output end and inverter direct-flow side of each photovoltaic group string；
Output end of the control end of N number of switching device 200 with driving power supply 100 is connected.
Figure 12 is shown by taking N=2 as an example, and two switching devices 200 share a driving power supply 100, save device into
This.
It is preferred that, photovoltaic DC anti-reverse device also includes：N number of diode；
Positive pole of the anode of N number of diode respectively with N number of photovoltaic group string is connected；
The negative electrode of N number of diode is connected, the negative electrode common point being formed by connecting and the input anode phase of driving power supply 100
Even.
Figure 13 is also shown by taking N=2 as an example, when two switching devices 200 share a driving power supply 100, driving
The input anode of power supply 100 can also be connected two-way simultaneously by diode and be inputted, wherein all the way because barrier is blocked
Or photovoltaic module failure and when causing photovoltaic group string there is no normal output voltage, the switching device in photovoltaic DC anti-reverse device
200 still can normally, have no effect on the normal work for other photovoltaic group strings being connected with the header box.
In addition, when inverter is concentrated inverter, can also be simultaneously integrated in using N number of photovoltaic DC anti-reverse device
In header box, header box is connected with N number of photovoltaic group string；N is the positive integer more than 1；
N number of photovoltaic DC anti-reverse device is connected with N number of photovoltaic group string respectively.
Figure 14 is also shown by taking N=2 as an example, and driving power supply 100 therein and switching device 200 may refer to above-mentioned
One embodiment, and other specific operation principles are same as the previously described embodiments, no longer repeat one by one herein.
The embodiment of each in this specification is described by the way of progressive, what each embodiment was stressed be with it is other
Between the difference of embodiment, each embodiment same or similar part mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or new using this practicality
Type.A variety of modifications to these embodiments will be apparent for those skilled in the art, determine herein
The General Principle of justice can in other embodiments be realized in the case where not departing from spirit or scope of the present utility model.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The most wide scope consistent with features of novelty.
Claims (10)
1. a kind of photovoltaic DC anti-reverse device, it is characterised in that including：Driving power supply and switching device；Wherein：
The input of the driving power supply is connected with the output end of photovoltaic group string；
The output end of the driving power supply is connected with the control end of the switching device；
The switching device is arranged between the photovoltaic group string and inverter direct-flow side；
The driving power supply is linear stabilized power supply, or is DC/DC Switching Power Supplies.
2. photovoltaic DC anti-reverse device according to claim 1, it is characterised in that the driving power supply includes many of series connection
Level linear stabilized power supply.
3. photovoltaic DC anti-reverse device according to claim 1, it is characterised in that the photovoltaic DC anti-reverse device is also wrapped
Include：Telecommunication circuit；
The input of the telecommunication circuit receives external control instruction；
The output end of the telecommunication circuit is connected with the control end of the switching device.
4. photovoltaic DC anti-reverse device according to claim 1, it is characterised in that the input and warp of the driving power supply
The output end for crossing the photovoltaic group string after header box confluxes is connected.
5. photovoltaic DC anti-reverse device according to claim 1, it is characterised in that the photovoltaic DC anti-reverse device is integrated
In inverter.
6. photovoltaic DC anti-reverse device according to claim 1, it is characterised in that the photovoltaic DC anti-reverse device is integrated
In header box, the header box is connected with N number of photovoltaic group string；N is the positive integer more than 1；
The input of the driving power supply is connected with the output end of any photovoltaic group string in N number of photovoltaic group string；
The photovoltaic DC anti-reverse device also includes：N-1 switching device；
A switching device is each provided between the output end and the inverter direct-flow side of each photovoltaic group string；
Output end of the control end of N number of switching device with the driving power supply is connected.
7. photovoltaic DC anti-reverse device according to claim 6, it is characterised in that the photovoltaic DC anti-reverse device is also wrapped
Include：N number of diode；
Positive pole of the anode of N number of diode respectively with N number of photovoltaic group string is connected；
The negative electrode of N number of diode is connected, the negative electrode common point being formed by connecting and the input anode phase of the driving power supply
Even.
8. photovoltaic DC anti-reverse device according to claim 1, it is characterised in that N number of photovoltaic DC anti-reverse device
It is integrated in header box, the header box is connected with N number of photovoltaic group string；N is the positive integer more than 1；
N number of photovoltaic DC anti-reverse device is connected with N number of photovoltaic group string respectively.
9. according to any described photovoltaic DC anti-reverse device of claim 1 to 8, it is characterised in that the switching device is set
Between the positive pole and inverter direct-flow side positive pole of the photovoltaic group string；
Or, the switching device is arranged between the negative pole of the photovoltaic group string and inverter direct-flow side negative pole；
Or, the switching device includes：Two switches；The positive pole and inverter that one switch is arranged at the photovoltaic group string are straight
Flow between the positive pole of side, another switch is arranged between the negative pole of the photovoltaic group string and inverter direct-flow side negative pole.
10. photovoltaic DC anti-reverse device according to claim 9, it is characterised in that the switching device is Electronic Control
Mechanical switch, or, controllable semiconductor switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720126615.8U CN206559307U (en) | 2017-02-10 | 2017-02-10 | A kind of photovoltaic DC anti-reverse device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720126615.8U CN206559307U (en) | 2017-02-10 | 2017-02-10 | A kind of photovoltaic DC anti-reverse device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206559307U true CN206559307U (en) | 2017-10-13 |
Family
ID=60011074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720126615.8U Active CN206559307U (en) | 2017-02-10 | 2017-02-10 | A kind of photovoltaic DC anti-reverse device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206559307U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066721A (en) * | 2018-09-29 | 2018-12-21 | 阳光电源（上海）有限公司 | A kind of photovoltaic generating system and its controller |
| CN113258552A (en) * | 2021-06-23 | 2021-08-13 | 阳光电源股份有限公司 | Reverse connection prevention control circuit and application device thereof |
-
2017
- 2017-02-10 CN CN201720126615.8U patent/CN206559307U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066721A (en) * | 2018-09-29 | 2018-12-21 | 阳光电源（上海）有限公司 | A kind of photovoltaic generating system and its controller |
| CN113258552A (en) * | 2021-06-23 | 2021-08-13 | 阳光电源股份有限公司 | Reverse connection prevention control circuit and application device thereof |
| CN113258552B (en) * | 2021-06-23 | 2024-02-09 | 阳光电源股份有限公司 | Reverse connection prevention control circuit and application device thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101715264A (en) | Over-voltage lockout protection circuit and LED drive circuit using same | |
| CN103683263A (en) | Circuit for preventing reverse plug in of direct current power supply and lamp | |
| CN107039980B (en) | A high-voltage DC power flow controller | |
| US11637431B2 (en) | Inverter | |
| CN102185480A (en) | Bidirectional isolation direct-current converter | |
| CN106169885B (en) | A cascaded six-switch multilevel inverter | |
| CN106533144B (en) | Anti-reverse and current flowing backwards circuit | |
| CN206559307U (en) | A kind of photovoltaic DC anti-reverse device | |
| CN103683264B (en) | A kind of anti-reverse connection circuit of direct current power supply and light fixture | |
| WO2020198960A1 (en) | Photovoltaic converter module string, control method, and system | |
| CN102842954B (en) | A kind of dual power automatic transfer switching equipment of to and fro flow of power | |
| CN110571782B (en) | Energy control circuit and method | |
| CN109921674B (en) | An improved Cockcroft-Walton single-stage step-up inverter appliance | |
| US20230299690A1 (en) | Neutral point clamped inverter and photovoltaic power supply system | |
| CN115514237B (en) | A low-loss standby method for energy router | |
| CN108649606B (en) | On-grid and off-grid switching device | |
| CN103684019A (en) | Five-level inverter and control method thereof | |
| CN101854115B (en) | Time retention circuit for preventing current from back pumping and power inverter | |
| CN202652136U (en) | Alternating current fan control circuit | |
| CN108521248B (en) | A movable cabinet-type photovoltaic water pump realizing distributed MPPT | |
| CN202737742U (en) | DC-DC booster converter | |
| CN208656632U (en) | A kind of metal-oxide-semiconductor driving circuit inhibiting driving voltage spike | |
| CN220775800U (en) | Shutoff, electric energy unit and photovoltaic system | |
| CN109525116A (en) | A kind of synchronous rectification driving circuit with maximum duty cycle limitation | |
| CN104009496A (en) | Dual-threshold judgment switching circuit for micro grid backflow protection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |