CN112234818A - Converter and charging equipment - Google Patents
Converter and charging equipment Download PDFInfo
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- CN112234818A CN112234818A CN202011051264.1A CN202011051264A CN112234818A CN 112234818 A CN112234818 A CN 112234818A CN 202011051264 A CN202011051264 A CN 202011051264A CN 112234818 A CN112234818 A CN 112234818A
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- 238000004891 communication Methods 0.000 claims description 19
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The embodiment of the invention provides a converter and a charging device, wherein the converter is provided with a positive output end and a negative output end, the positive output end and the negative output end are respectively used for connecting a cable, and the converter comprises: the positive input end and the negative input end are used for being respectively connected with the positive electrode and the negative electrode of the power supply module, and the negative input end is electrically connected with the negative output end; the switch module is connected between the positive input end and the positive output end; the processing module receives the control signal and controls the switch module to be switched on or switched off based on the control signal; the one-way conduction device is connected between the anode output end and the cathode output end, the one-way conduction device is cut off during the conduction period of the switch module, and the processing module controls the one-way conduction device to be conducted during the closing period of the switch module based on the control signal. The converter and the charging equipment provided by the embodiment of the invention are beneficial to safely controlling the high-voltage direct current voltage.
Description
Technical Field
The embodiment of the invention relates to the field of photovoltaic systems, in particular to a converter and charging equipment.
Background
With the obvious problems of energy shortage, global temperature rise, increasingly worsened environment and the like, solar energy is receiving more and more attention as a green renewable energy source. A photovoltaic module is a device that converts renewable solar energy into electrical energy. At present, a photovoltaic system is formed by connecting a plurality of photovoltaic modules in series to form a photovoltaic module string, and then connecting the photovoltaic modules in series into an inverter, so that direct current provided by the photovoltaic module string is converted into alternating current and grid connection is realized.
However, the high dc voltage formed by the string of photovoltaic modules is likely to cause personal hazards and fire accidents. The existing photovoltaic module is connected with the input end of equipment through an inverter, and when the power input needs to be stopped, the equipment is short-circuited. However, the power supply has no reliable load due to the adoption of the method, high-voltage electric arcs and high current are easy to pass through, and the danger coefficient is large. Although the connection of a shutdown control output to a single photovoltaic module can also stop the power input, this also does not avoid the high voltage output by the entire plurality of photovoltaic modules, and is also dangerous.
Disclosure of Invention
The embodiment of the invention aims to provide a converter and charging equipment to solve the problems of low effectiveness and poor safety in a photovoltaic charging control process.
To solve the above problems, an embodiment of the present invention provides a converter having a positive output end and a negative output end, where the positive output end and the negative output end are respectively used for connecting cables, and the converter includes: the positive input end and the negative input end are used for being respectively connected with a positive electrode and a negative electrode of the power module, and the negative input end is electrically connected with the negative output end; a switch module connected between the positive input terminal and the positive output terminal; the processing module receives a control signal and controls the switch module to be switched on or switched off based on the control signal; the one-way conduction device is connected between the anode output end and the cathode output end, the one-way conduction device is cut off during the conduction period of the switch module, and the processing module controls the conduction of the one-way conduction device during the closing period of the switch module based on the control signal.
Additionally, the processing module includes: a communication unit and a control unit; the communication unit is used for receiving the control signal and sending the control signal to the control unit; the control unit is used for controlling the switch module and the unidirectional conduction module based on the control signal.
In addition, the control unit is provided with a first pin and a second pin, the first pin is connected with the anode output end, and the second pin is connected with the cathode output end; the control unit is used for adjusting the voltage of the first pin and the voltage of the second pin based on the control signal so as to enable the unidirectional conducting device to be conducted.
In addition, the unidirectional conducting device comprises a diode, the anode of the diode is connected with the cathode output end, and the cathode of the diode is connected with the anode output end.
In addition, the switching module comprises a MOS device or an IGBT device; the control unit further includes: and the third pin is electrically connected with the grid electrode of the MOS device or the grid electrode of the IGBT device.
In addition, still include: the positive output end, the negative output end, the positive input end and the negative input end are led out of the shell; and the switch module, the processing module and the one-way conduction device are positioned inside the shell.
Correspondingly, an embodiment of the present invention further provides a charging device, which has a total positive input end and a total negative output end, and includes: a plurality of converters as described above; a plurality of cables connected in series between two adjacent converters to connect the positive output end and the negative output end of one converter; the positive pole and the negative pole of each power module are respectively connected with the positive pole input end and the negative pole input end of the corresponding converter, and the power modules are connected in series between the total positive pole input end and the total negative pole output end.
Additionally, the power module includes a photovoltaic assembly.
In addition, still include: the inverter is connected with the total positive electrode input end and the total negative electrode output end.
In addition, still include: a DC-DC converter connected to the total positive input and the total negative output.
Compared with the prior art, the technical scheme provided by the embodiment of the invention has the following advantages:
the converter and the charging device provided by the embodiment of the invention have a positive output end and a negative output end, wherein the positive output end and the negative output end are respectively used for connecting a cable, and the converter and the charging device comprise: the positive input end and the negative input end are used for being respectively connected with the positive electrode and the negative electrode of the power supply module, and the negative input end is electrically connected with the negative output end; the switch module is connected between the positive input end and the positive output end; the processing module receives the control signal and controls the switch module to be switched on or switched off based on the control signal; the one-way conduction device is connected between the anode output end and the cathode output end, the one-way conduction device is cut off during the conduction period of the switch module, and the processing module controls the one-way conduction device to be conducted during the closing period of the switch module based on the control signal. According to the converter and the charging equipment provided by the embodiment of the invention, the converter and the power supply are mutually independent, the phenomenon that the charging equipment cannot be used due to the failure of a single power supply is effectively avoided, the high-voltage direct-current voltage can be remotely controlled, and the safety performance of the charging equipment is improved.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 to 2 are structural diagrams of a converter according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of a connection between a converter and a cable according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of a charging apparatus according to a second embodiment of the present invention;
fig. 5 is a structural diagram of a charging device according to a second embodiment of the present invention.
Detailed Description
Known from the background art, the photovoltaic charging control process has the problems of low effectiveness and poor safety.
The analysis finds that the main reasons comprise: the charging equipment needs to be directly coupled with the power supply module and cannot be connected with a plurality of power supply modules simultaneously; or, a plurality of power supply modules are connected to the same processing module, so that the number of the connected power supply modules is limited; or, an independent power supply is needed to supply power to the control circuit, and only the voltage and current of the total output of the equipment can be reduced, and if the output of the power supply is grounded, high voltage can also occur, which causes danger.
In order to solve the above problem, embodiments of the present invention provide a converter and a charging device, where a processing module of the converter controls on/off of a switch module and off/on of a unidirectional conducting device based on a control signal. Therefore, the converter can realize effective control on the power supply under the condition of not directly contacting the charging high-voltage cable, thereby improving the safety of the charging equipment; in addition, the converter and the power supply are mutually independent, the problem that the charging equipment cannot be used due to failure of a single power supply can be effectively avoided, the high-voltage direct-current voltage can be remotely controlled, and the safety performance of the charging equipment is improved.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
Fig. 1 to 2 are structural diagrams of a converter according to a first embodiment of the present invention.
Referring to fig. 1, in the present embodiment, a converter 100 has a positive output terminal 101 and a negative output terminal 102, and the positive output terminal 101 and the negative output terminal 102 are respectively used for connecting cables, and includes: the positive input end 103 and the negative input end 104 are used for being respectively connected with a positive electrode and a negative electrode of the power supply module, and the negative input end 104 is electrically connected with the negative output end 102; the switch module 111, the switch module 111 is connected between the positive input end 103 and the positive output end 101; the processing module 121, the processing module 121 receives the control signal and controls the switch module 111 to be switched on or switched off based on the control signal; the unidirectional conducting device 131, the unidirectional conducting device 131 is connected between the positive output terminal 101 and the negative output terminal 102, the unidirectional conducting device 131 is turned off during the conducting period of the switch module 111, and the processing module 121 controls the unidirectional conducting device 131 to be turned on during the turning-off period of the switch module 111 based on the control signal.
The following detailed description will be made in conjunction with the accompanying drawings.
Referring to fig. 2, the processing module 121 (refer to fig. 1) includes: a communication unit 123 and a control unit 122; the communication unit 123 is configured to receive the control signal and send the control signal to the control unit 122; the control unit 122 is configured to control the switch module 111 and the unidirectional conducting module 131 based on the control signal.
The control signal received by the communication unit 123 is mainly a specific signal given by the user terminal or the main output terminal, and specifically a Programmable Logic Controller (PLC) signal or a wireless signal.
The control unit 122 includes a control chip and a circuit, and the control unit 122 is configured to control the switch module 111 to be turned on or off and the unidirectional conducting module 131 to be turned off or on based on the control signal.
Specifically, when the control signal received by the communication unit 123 is an enable signal, the control unit 122 controls the switch module 111 to be turned on based on the enable signal, that is, the power module is connected to the circuit to turn on the circuit and output a high voltage, at this time, the one-way conduction device 131 is turned off, and the line on which the power module is located serves as a conduction path. When the control signal received by the communication unit 123 is a non-permission signal or does not receive a permission signal, the control unit 122 controls the switch module 111 to be turned off based on the non-permission signal, and controls the one-way conduction device 131 to be turned on, so that a line on which the one-way conduction device 131 is located serves as a conduction path.
In one example, when the communication unit 123 receives different control signals, the control unit 122 can implement a fast response based on the control signals and control the switch module 111 or the one-way conducting device 131, and the time of the whole process is controlled within 30 s.
It is understood that, in the present embodiment, the communication unit 123 and the control unit 122 are two independent unit modules. In other embodiments, the communication unit and the control unit may also be integrated in the same module.
In this embodiment, the control unit 122 has a first pin 141 and a second pin 142, and the first pin 141 is connected to the positive output terminal 101, and the second pin 142 is connected to the negative output terminal 102; the control unit 122 is configured to adjust a voltage of the first pin 141 and a voltage of the second pin 142 based on the control signal, so as to turn on the unidirectional conducting device 131.
Specifically, when the communication unit 123 receives the non-enable signal, the internal control chip and circuit of the control unit 122 adjust the voltage of the first pin 141 to be lower than the voltage of the second pin 142 based on the non-enable signal, and the voltage difference between the two is greater than the turn-on voltage of the unidirectional device 131, so as to turn on the unidirectional device 131.
In this embodiment, the on-state current and the on-state voltage are respectively limited to 0.5A/42V. The conduction current and the voltage are kept in a small range, and the safety of the charging control process can be improved.
In this embodiment, the unidirectional conducting device 131 includes a diode, and the anode of the diode is connected to the cathode output terminal 102, and the cathode of the diode is connected to the anode output terminal 101. In other embodiments, the unidirectional device may also be a triode or Silicon Controlled Rectifier (SCR).
It should be noted that, in other embodiments, the communication unit may also be used to control whether the unidirectional conducting module is turned on or off.
The switching module 111 includes a MOS device or an IGBT device; the control unit 122 further includes: and a third pin 143, and the third pin 143 is electrically connected to a gate of the MOS device or a gate of the IGBT device. The control unit 122 controls the voltage of the third pin 143 to turn on and off the MOS device or the IGBT device.
In this embodiment, the converter 100 further includes: the positive output end 101, the negative output end 102, the positive input end 103 and the negative input end 104 are led out of the shell 151; and the switching module 111, the processing module 121 (refer to fig. 1), and the one-way conduction device 131 are located inside the housing 151.
In summary, the converter provided by this embodiment includes a processing module, a switch module and a unidirectional conducting device, and the processing module controls the switch module and the unidirectional conducting device based on the received control signal, so as to be beneficial to remotely controlling the high-voltage direct-current voltage and improve the safety performance of the charging device.
A second embodiment of the present invention provides a charging apparatus including the converter provided in the above embodiment.
The charging device provided by the second embodiment of the present invention will be described in detail below with reference to the accompanying drawings, and the same or corresponding parts as those in the previous embodiment may be referred to in the description of the previous embodiment, which will not be described in detail below. Fig. 3 is a schematic diagram of a connection between a converter and a cable according to a second embodiment of the present invention; fig. 4 is a schematic diagram of a charging apparatus according to a second embodiment of the present invention; fig. 5 is a structural diagram of a charging device according to a second embodiment of the present invention.
Referring to fig. 3 to 5, in the present embodiment, the charging device has a total positive input terminal and a total negative output terminal, and includes: in the foregoing embodiments, the converters 200 include a switch module 211, a communication unit 223, a control unit 222, and a unidirectional conducting device 231; a plurality of cables 261, the cables 261 being connected in series between two adjacent converters 200 to connect the positive output terminal and the negative output terminal of one converter 200; a plurality of power modules 271, the positive pole and the negative pole of each power module 271 are respectively connected to the positive input terminal 203 and the negative input terminal 204 of the corresponding converter 200, and the plurality of power modules 271 are connected in series between the total positive input terminal and the total negative output terminal.
The positive input end 203 and the negative input end 204 of the converter 200 are respectively connected to the positive electrode and the negative electrode of the power module 271, and when the control signal received by the communication unit 223 is an enable signal, the control unit 222 controls the switch module 211 to be turned on based on the enable signal, that is, the power module 271 is connected to a circuit to realize circuit conduction, and outputs high voltage and current to the outside; when the control signal received by the communication unit 223 is a non-permission signal or a permission signal is not received, the control unit 222 controls the switch module 211 to be turned off based on the non-permission signal, the power module 271 supplies power to the processing module, and the control unit 222 adjusts the voltage of the first pin and the voltage of the second pin based on the internal circuit, so that the voltage of the first pin of the control unit 222 is lower than the voltage of the second pin, the unidirectional conducting device 231 is turned on, and a low voltage is output.
In this embodiment, the one-way conduction device 231 is turned on after the single power module 271 is shielded or the output voltage is biased, so that the influence of the failure of the single power module 271 on the whole charging device can be reduced.
It should be noted that when the communication unit 223 receives different control signals, the control unit 222 can implement a fast response based on the control signals, and control the switch module 211 or the one-way conducting device 231 to adjust the voltage of the whole device from KV to within 42V, and control the time of the whole process within 30 s.
In addition, in this embodiment, the switch module 211 is a MOS transistor, and the unidirectional conducting device 231 is a diode. In other embodiments, the switch module and the one-way conduction device may have other structures.
It can be understood that, when a certain power module 271 in the charging device fails, the control unit 222 can adjust the voltage across the unidirectional conducting device 231 to achieve the conduction of the unidirectional conducting device 231, so that the use and operation of the entire charging device are not affected by the failure of the certain power module 271.
When a single converter 200 fails, only a single power supply module 271 is affected, and the whole charging device is not affected.
In addition, adjacent converters 200 are directly connected through a cable 261, so that an additional physical joint does not exist, and the influence on the total output of the power supply due to the difference of the joints is avoided, and the reduction of the total output efficiency of the power supply is avoided.
Meanwhile, the converters 200 are connected in series through cables 261, so that the series connection of 1-500 power modules 271 in a long distance can be realized.
In this embodiment, the power module 271 includes a photovoltaic module. The power module 271 can also directly supply power to the processing module to ensure the operation of the communication unit 223 and the control unit 222, without the need of an additional auxiliary power supply, thereby reducing the energy configuration. In other embodiments, the power module may also match any other dc power supply according to the requirement.
The power modules 271 are integrated separately from the converter 200, so that when a single power module 271 is damaged and needs to be replaced, the power supply is directly replaced without disconnecting the total power supply.
In this embodiment, the charging device further includes: and the inverter 281 are connected with a total positive electrode input end and a total negative electrode output end.
In this embodiment, the method further includes: and a DC-DC converter (not shown) connected to the total positive input terminal and the total negative output terminal.
The total output of the charging device is connected to an inverter 281 or a DC-DC converter to supply power to the load.
In summary, in the charging device provided by this embodiment, the converter and the power supply module are independent from each other, which effectively avoids the problem that the charging device cannot be used due to the failure of a single power supply module, and is beneficial to remotely controlling the high-voltage direct-current voltage, and improving the safety performance of the charging device. In addition, the charging equipment can integrate a plurality of power modules, and the power modules are connected through pure cables, so that the running power consumption of the charging equipment can be reduced.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A converter having a positive output and a negative output, and the positive output and the negative output are for connection to a cable, respectively, comprising:
the positive input end and the negative input end are used for being respectively connected with a positive electrode and a negative electrode of the power module, and the negative input end is electrically connected with the negative output end;
a switch module connected between the positive input terminal and the positive output terminal;
the processing module receives a control signal and controls the switch module to be switched on or switched off based on the control signal;
the one-way conduction device is connected between the anode output end and the cathode output end, the one-way conduction device is cut off during the conduction period of the switch module, and the processing module controls the conduction of the one-way conduction device during the closing period of the switch module based on the control signal.
2. The converter according to claim 1, wherein the processing module comprises: a communication unit and a control unit; the communication unit is used for receiving the control signal and sending the control signal to the control unit; the control unit is used for controlling the switch module and the unidirectional conduction module based on the control signal.
3. The converter according to claim 2, wherein the control unit has a first pin and a second pin, and the first pin is connected to the positive output terminal and the second pin is connected to the negative output terminal; the control unit is used for adjusting the voltage of the first pin and the voltage of the second pin based on the control signal so as to enable the unidirectional conducting device to be conducted.
4. A converter according to claim 1 or 3, wherein the unidirectional conducting device comprises a diode, and wherein the anode of the diode is connected to the cathode output and the cathode of the diode is connected to the anode output.
5. The converter according to claim 2, wherein the switching module comprises a MOS device or an IGBT device; the control unit further includes: and the third pin is electrically connected with the grid electrode of the MOS device or the grid electrode of the IGBT device.
6. The converter of claim 1, further comprising: the positive output end, the negative output end, the positive input end and the negative input end are led out of the shell; and the switch module, the processing module and the one-way conduction device are positioned inside the shell.
7. A charging device having a total positive input and a total negative output, comprising:
a plurality of converters according to any one of claims 1-6;
a plurality of cables connected in series between two adjacent converters to connect the positive output end and the negative output end of one converter;
the positive pole and the negative pole of each power module are respectively connected with the positive pole input end and the negative pole input end of the corresponding converter, and the power modules are connected in series between the total positive pole input end and the total negative pole output end.
8. The charging apparatus of claim 7, wherein the power module comprises a photovoltaic assembly.
9. The charging apparatus according to claim 7, further comprising: the inverter is connected with the total positive electrode input end and the total negative electrode output end.
10. The charging apparatus according to claim 7, further comprising: a DC-DC converter connected to the total positive input and the total negative output.
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|---|---|---|---|
| CN202011051264.1A CN112234818A (en) | 2020-09-29 | 2020-09-29 | Converter and charging equipment |
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| CN202011051264.1A CN112234818A (en) | 2020-09-29 | 2020-09-29 | Converter and charging equipment |
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| CN112234818A true CN112234818A (en) | 2021-01-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258874A (en) * | 2021-06-16 | 2021-08-13 | 浙江英达威芯电子有限公司 | Shutoff device and photovoltaic system |
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| CN103227588A (en) * | 2012-01-30 | 2013-07-31 | 太阳能安吉科技有限公司 | Photovoltaic panel circuitry |
| CN111431232A (en) * | 2020-03-31 | 2020-07-17 | 清华大学 | Retired battery module protected by flexible connection |
Cited By (2)
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| CN113258874A (en) * | 2021-06-16 | 2021-08-13 | 浙江英达威芯电子有限公司 | Shutoff device and photovoltaic system |
| WO2022262112A1 (en) * | 2021-06-16 | 2022-12-22 | 浙江英达威芯电子有限公司 | Shutoff device and photovoltaic system |
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