CN202364149U - Current converting unit control board of photovoltaic inverter - Google Patents
Current converting unit control board of photovoltaic inverter Download PDFInfo
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- CN202364149U CN202364149U CN 201120521375 CN201120521375U CN202364149U CN 202364149 U CN202364149 U CN 202364149U CN 201120521375 CN201120521375 CN 201120521375 CN 201120521375 U CN201120521375 U CN 201120521375U CN 202364149 U CN202364149 U CN 202364149U
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- 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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses a current converting unit control board of a photovoltaic inverter. The current converting unit control board is connected between a main control board of the photovoltaic inverter and a current converting unit of the photovoltaic inverter, and is a series receiving and transmitting communication structure. The series receiving communication is defined between the main control board and the current converting unit, and the series transmitting communication is defined between the current converting unit and the main control board. Input series communication signals are firstly filtered through an input buffer filter circuit to remove interference signals, strengthen the current driving capability of the signals and the antijamming capability, so that the electromagnetic interference during communication is reduced to the largest extent. The current converting unit control board also comprises an address dip switch which is connected with a programmable logic device and corresponds to the address of a component in the current converting unit, so the accurate and reliable transmission of commands is guaranteed. The start-up voltage of the component is adjusted by measuring the temperature of the component in the current converting unit through a temperature sensor and transmitting a characteristic curve, so that the start-up loss of the component is optimized.
Description
Technical field
The utility model relates to a kind of current conversion (DC/AC, straight, interchange conversion) unit controls plate, particularly relates to a kind of current conversion (DC/AC) unit controls plate of photovoltaic DC-to-AC converter.
Background technology
Photovoltaic DC-to-AC converter is one of core technology of grid-connected photovoltaic system, but because the distributed architecture and the power capacity of photovoltaic system itself are different, the topological structure of photovoltaic DC-to-AC converter also has nothing in common with each other.For building in the large-sized photovoltaic power station of desert or opening, generally need and the grid parallel connection, carry through power transmission network, resupply after the step-down and use electric loading.In the scheme that has, because the restriction of single current conversion (DC/AC) unit self power capacity needs a plurality of DC/AC unit to connect and parallelly connected combination usually.This shows; The DC/AC unit that is used for photovoltaic DC-to-AC converter is the elementary cell that constitutes high-power photovoltaic DC-to-AC converter; The reliability of DC/AC unit concerns the reliability of entire equipment, and for the design of DC/AC unit, the basic design framework of industry is that typical structure is as shown in Figure 1.
As shown in Figure 1, main control board is through inverter unit control circuit board [or claiming current conversion (DC/AC) unit controls circuit board], in current conversion (DC/AC) unit; DC bus-bar voltage is from P and N input, and direct current gives capacitor C 1 charging, and the voltage on the electric capacity is directly by Q1; Q2, the H bridge that these four IGBT devices of Q3 and Q4 are formed is controlled, when Q1 and Q4 open (Q3 and Q2 are in closed condition); The output T1 of DC/AC unit, the voltage between the T2 just equals positive busbar voltage, when Q3 and Q2 open (Q1 and Q4 are in closed condition); The output T1 of DC/AC unit, the voltage between the T2 just equal the busbar voltage born.In the working control; DC/AC unit controls circuit board (being the inverter unit control circuit board among Fig. 1) receives from the order (communication between DC/AC unit controls circuit board and the main control board is the digital communication that utilizes optical fiber) of the main control board of photovoltaic DC-to-AC converter and carries out Q1; Q2, Q3 and Q4 open and turn-off control.
As previously mentioned, the DC/AC unit plays crucial effects to the unfailing performance of photovoltaic DC-to-AC converter, so the reliable DC/AC of design stability unit becomes the important process of research and development high reliability photovoltaic DC-to-AC converter.In the practical application, the reliability of DC/AC unit and not fully up to expectations, work is no more than six months usually just needs repair and replacement, has enumerated two major failures of DC/AC unit below:
A, anti-electromagnetic interference capability are limited.Each DC/AC unit of photovoltaic DC-to-AC converter is operated in high frequency, big electric current and the high-tension environment always, therefore, and the electromagnetism operational environment very severe of DC/AC unit controls plate.But, all the time, DC/AC unit controls plate must keep and master board between normal communication (receiving to Q1 Q2, the control command of Q3 and Q4 and the running status etc. of sending local DC/AC unit, the undesired DC/AC cell failure that means of communication).Though all existing products are to use optical fiber as the physical communication media between DC/AC unit controls circuit board and the master control circuit board at present, operate in the interference that signal in the optical fiber does not receive electromagnetic radiation.But because DC/AC unit controls plate self is to be operated in the abominable electromagnetic radiation environment; Communication signal might receive strong jamming on DC/AC unit controls plate; Cause Q1; Q2, the switch of Q3 and Q4 is incorrect, thus the information that perhaps causes the master board mistake to collect the DC/AC unit produces erroneous judgement.
The too high DC/AC of causing of the H bridge working temperature unit that B, IGBT device form to work on (particularly local) in the higher work of ambient temperature such as desert.Because H bridge (Q1; Q2; Q3 and Q4 totally four IGBT devices form) be operated in frequent conducting and cut-off state; All the certain power loss can be arranged when opening and closing, the power of loss changes into heat and can cause the temperature of DC/AC unit to rise, and (complete machine changes the wind passage and goes wrong if DC/AC unit heat dissipating state is bad; Ambient temperature is crossed high factor and all possibly caused this phenomenon to occur), thus the too high phenomenon of damaging components and parts of working temperature caused behind the long-play inevitably.The power loss of IGBT device is relevant with the working temperature of IGBT device drive voltage Vgs and IGBT device; Power loss when increasing the opening driving voltage Vge and can reduce the IGBT device and open of IGBT device; But turning-on voltage can not unrestrictedly increase, and when greater than certain value the time, can damage IGBT device self.Therefore, when taking all factors into consideration factor such as load and stray inductance electric capacity, generally speaking, the turning-on voltage of IGBT device all is to be fixed on the safety value that a producer is thought at present, but so-called safety value is not the optimum value that makes the IGBT device loss minimum.
Summary of the invention
The purpose of the utility model provides a kind of current conversion (DC/AC) unit controls plate of photovoltaic DC-to-AC converter; Overcome two major failures that occur easily in the above-mentioned prior art; The one, the antijamming capability of enhancing current conversion (DC/AC) unit controls plate, the electromagnetic interference effect when reducing current conversion (DC/AC) unit controls plate and master board communication to greatest extent; Another purpose is through the indicatrix of the temperature monitoring of the components and parts (IGBT device) in current conversion (DC/AC) unit and components and parts (IGBT device) being regulated the turning-on voltage of components and parts (IGBT device), being made the turn-on consumption of components and parts (IGBT device) reach optimum.
For reaching above-mentioned purpose, the technical solution of the utility model is:
A kind of current conversion (DC/AC) unit controls plate of photovoltaic DC-to-AC converter is provided, and said current conversion unit control board is connected between the current conversion unit of master board and said photovoltaic DC-to-AC converter of said photovoltaic DC-to-AC converter, is the serial communication structure of receiving and sending out.Be defined as the serial communication of receipts by master board to current conversion unit, be defined as the serial communication of sending out by current conversion unit to master board:
Said current conversion unit control board comprises fiber optical transceiver, input buffering filter circuit, programmable logic device; The crystal oscillator device that is connected with programmable logic device with the input buffering filter circuit; That be connected with programmable logic device and with said current conversion unit in corresponding address, components and parts address DIP switch, photoisolator, digital to analog converter; Temperature sensor, analog to digital converter and output buffer;
The current conversion unit of said master board to photovoltaic DC-to-AC converter by photovoltaic DC-to-AC converter is defined as the serial communication of receipts; Be to receive the serial communication signals that master board is sent by fiber optical transceiver; Through input buffering filter circuit and connected crystal oscillator device filtering interference signals; Import programmable logic device behind the enhancing signal electric current; Programmable logic device receives and resolves the content of the serial data packet of this serial communication signals, according to the content of serial data packet, after comparing for the address in the serial data packet and said address DIP switch; Components and parts send the control commands corresponding signal or send the monitor data signal according to the requirement of serial data packet in the corresponding current conversion unit in address, and this signal is delivered to said current conversion unit through photoisolator and digital to analog converter;
The master board of said current conversion unit to photovoltaic DC-to-AC converter by photovoltaic DC-to-AC converter is defined as the serial communication of sending out; Be to be input in the programmable logic device after the temperature of components and parts in the said current conversion unit that is recorded by temperature sensor becomes digital signal through analog to digital converter with analog signal conversion; The requirement of the serial data packet content that programmable logic device sends according to master board sends to said master board with the temperature of on off state, voltage, electric current and the actual measurement of components and parts in the said current conversion unit through output buffer and fiber optical transceiver;
Programmable logic device also sends the signal to this components and parts adjustment turning-on voltage according to the temperature of components and parts in temperature of surveying and the said current conversion unit and the relation of components and parts voltage; The signal of this adjustment turning-on voltage is through photoisolator, and the drive circuit of components and parts is adjusted the turning-on voltage of these components and parts in digital to analog converter and the said current conversion unit.
Further, the content of the serial data packet of communications protocol comprises frame head, current conversion unit address, order data, data check, reply data and frame end in the said programmable logic device.
Again, the said input buffering filter circuit of the utility model comprises buffer and the filter circuit that is made up of logical device series connection that is connected with its output.
In addition, the components and parts in the said current conversion unit are IGBT electronic devices and components.
The current conversion unit control board of the utility model has outstanding advantage.
Structure like above-mentioned the utility model; Because; The utility model said be in the serial communication of receiving by master board to current conversion unit, after the serial communication signals of being sent by master board receives through fiber optical transceiver, at first pass through input buffering filter circuit and connected crystal oscillator device filtering interference signals; Strengthened the current driving ability of signal; Satisfied the current drives requirement of subsequent conditioning circuit, strengthened antijamming capability, the electromagnetic interference effect when having reduced communication between current conversion unit control board and the said master board of the utility model to greatest extent.So, strengthened the job stability and the reliability of the current conversion unit control board of the utility model and the useful life that has prolonged it.
Structure like above-mentioned the utility model; Because; The utility model in the said serial communication of receiving by master board and current conversion unit, comprise be connected with programmable logic device with said current conversion unit in corresponding address, components and parts address DIP switch.Behind the serial communication signals entering programmable logic device through filtering and increase electric current; Programmable logic device receives and resolves the content of the serial data packet of this serial communication signals; Content according to serial data packet; Compare for address in the serial data packet and said address DIP switch; Have only when the address date in the serial data packet certain with " address DIP switch " in address date when consistent, ability to the corresponding current conversion unit of address DIP switch in the components and parts address send control command.Because address date in the serial data packet and the striking resemblances of the address date in the programmable logic device, then the address of address DIP switch again with current conversion unit in the address of components and parts be corresponding.So, just guaranteed that also the address of components and parts in the current conversion unit that serial data packet requires to send to is consistent with the actual address that will be delivered to the interior components and parts of current conversion unit.And the different address data therefrom are stripped from out.Therefore, the current conversion unit control board of the utility model not only transmits order accurately and reliably, and maintenance control panel is simple and convenient.
Structure like above-mentioned the utility model; Because; The utility model is at the said serial communication of sending out that is defined as by current conversion unit to master board; Be to be input in the programmable logic device after temperature by components and parts (like the IGBT device) in the actual said current conversion unit that records of temperature sensor becomes digital signal through analog to digital converter with analog signal conversion; The requirement of the serial data packet content that programmable logic device sends according to master board on the one hand sends to master board with the temperature of this actual measurement through output buffer and fiber optical transceiver; Send signal according to the temperature of components and parts (like the IGBT device) in temperature of surveying and the current conversion unit and the indicatrix relation of voltage on the other hand to this components and parts adjustment turning-on voltage.The signal of this adjustment turning-on voltage is through photoisolator, and the drive circuit of components and parts is adjusted the turning-on voltage of these components and parts (IGBT device) in digital to analog converter and the current conversion unit, makes the turn-on consumption of components and parts (IGBT device) reach optimum.
Description of drawings
Fig. 1 is the sketch map of said photovoltaic DC-to-AC converter current conversion (DC/AC is that direct current is delivered stream) unit one typical structure;
Fig. 2 is the structural representation of the utility model current conversion (DC/AC) unit controls plate one embodiment;
Fig. 3 is the structural representation of input buffering filter circuit one embodiment among Fig. 2;
Fig. 4 is transmission characteristic and the temperature relation curve chart of components and parts IGBT in said current conversion (DC/AC) unit.
Embodiment
Further specify the architectural feature of the utility model current conversion (DC/AC) unit controls plate below in conjunction with accompanying drawing.
As shown in Figure 1; The described current conversion of the utility model (DC/AC) unit controls plate (or is claimed DC/AC unit controls circuit board; Or claim the inverter unit control circuit board) between the master board (or claiming master control circuit board) that is connected in said photovoltaic DC-to-AC converter and the current conversion unit of said photovoltaic DC-to-AC converter, be receive and the serial communication structure.Be defined as the serial communication of receipts by master board to current conversion unit, be defined as the serial communication of sending out by current conversion unit to master board.
As shown in Figure 2; The said current conversion unit control board of the utility model comprises fiber optical transceiver 1, input buffering filter circuit 2, programmable logic device 3; The crystal oscillator device 4 that is connected with programmable logic device 3 with input buffering filter circuit 2; That be connected with programmable logic device 3 and with said current conversion unit in corresponding address, components and parts address DIP switch 5, photoisolator 12, digital to analog converter 11; Temperature sensor 6,7,8,9, analog to digital converter 10 and output buffer 13.
As shown in Figure 2; The serial communication that said master board to current conversion unit is defined as receipts is to import programmable logic device 3 by the serial communication signals that fiber optical transceiver 1 reception master board is sent through 2 filtering of input buffering filter circuit with after strengthening current signal; Programmable logic device 3 receives and resolves the content of the serial data packet (or claiming serial data frame) of this serial communication signals; Content according to serial data packet; After comparing for the address in the serial data packet and said address DIP switch 5; Components and parts to appropriate address send the control commands corresponding signal or send the monitor data signal according to the requirement of serial data packet, and this signal is delivered to said current conversion unit through photoisolator 12 and digital to analog converter 11.
As shown in Figure 2; The said serial communication of sending out that is defined as by current conversion unit to master board; Be to be input to programmable logic device 3 after the temperature of components and parts Q1, Q3, Q4, Q2 in the said current conversion unit that is recorded by temperature sensor 6,7,8,9 becomes digital signal through analog to digital converter 10 with analog signal conversion; The requirement of the serial data packet content that programmable logic device 3 sends according to master board sends to said master board with the temperature of on off state, voltage, electric current and the actual measurement of components and parts Q1, Q2, Q3, Q4 in the said current conversion unit through output buffer 13 and fiber optical transceiver 1.
As shown in Figure 2; Programmable logic device 3 also sends the signal of these components and parts Q1, Q2, Q3, Q4 being adjusted turning-on voltage according to components and parts Q1, Q2, Q3, the temperature of Q4 and the relation (temperature as shown in Figure 6 and the indicatrix of voltage) of components and parts voltage in the temperature of temperature sensor 6,7,8,9 actual measurement and the said current conversion unit; The signal of this adjustment turning-on voltage is through photoisolator 12; The drive circuit of components and parts is adjusted the turning-on voltage of these components and parts Q1, Q2, Q3, Q4 in digital to analog converter 11 and the said current conversion unit, so that the turn-on consumption of components and parts Q1, Q2, Q3, Q4 reaches optimum.
In the present embodiment, said programmable logic device 3 adopts the serial 5CEA7 of CycloneV that altera corp provides.The used communications protocol program of inner above-mentioned the utility model of writable special use.The included content of the serial data frame (serial data packet) of special communication protocol is as shown in table 1 in the said programmable logic device 3.
Table 1
As shown in table 1, the content of the communications protocol in the said programmable logic device 3 (the utility model is special-purpose) serial data packet comprises frame head, current conversion unit address, order data, data check, reply data and frame end.Wherein " frame head " is to be used for identifying the initial of frame data; The power unit address be meant components and parts in the said photovoltaic DC-to-AC converter current conversion unit the address (in order to above-mentioned and current conversion unit in data in the components and parts address corresponding " address DIP switch " compare), the components and parts in the different current conversion unit have different address; Order data be master board will with the content of the real communication of current conversion unit, comprise that monitor data (temperature, voltage, electric current etc.) is sent in requirement or to Q1, Q2, the switch control command of Q3 and Q4.If certain reason (electromagnetic interference or master board fault), address error or check errors, the current conversion unit control board must send miscue and retransmission requesting in reply data.
In the present embodiment, said input buffering filter circuit 2 comprises buffer and the filter circuit that is made up of logical device series connection that is connected with its output.As shown in Figure 3, in the present embodiment, buffer 21 (adopting the 74LVC1G07SE-7 chip that is provided by DIODE company in the present embodiment) is to be used for the current driving ability of enhancing signal, satisfies the current drives requirement of subsequent conditioning circuit.As shown in Figure 3, in the present embodiment, filter circuit 22 is to constitute (in the present embodiment, U6, U7, U8 adopt the SN74AUC1G74 chip of TI company) by three logical devices (or claiming logic chip) U6, U7, U8 series connection.The signal one tunnel of buffer 21 outputs directly gets into the logical device U6 (D triggering) in the filter circuit 22; Other one the tunnel as logical device U6, the input that resets of U7 (D triggering) and U8 (D triggering).The crystal oscillator signal of crystal oscillator device 4 output is as logical device U6, the clock signal of U7 and U8.Output signal at buffer 21 is high; The crystal oscillator signal is by low uprising the time; Logical device U6, the D end signal of U7 and U8 are latched into Q end (the output signal of buffer is high width greater than the crystal oscillator signal be 3 times of high width time, the output Q end of U8 is for high); It is low exporting signals when buffer 21, and the variation of crystal oscillator signal will be left in the basket, and the output Q end of U8 is forced and drags down.Therefore, the crystal oscillator signal suitable according to the speed selection of serial communication, can the undesired interference signal of filtering (for example, the speed of serial communication is 5KHz, selects the crystal oscillator signal of 24KHz, utilizes the interference signal that this circuit just can the above speed of filtering 8KHz).
In the present embodiment, components and parts Q1, Q2, Q3, Q4 are the IGBT electronic devices and components in the said current conversion unit.Fig. 4 is transmission characteristic and the temperature relation curve chart of components and parts IGBT in the said current conversion unit.As shown in Figure 4, the transmission characteristic between the collector electrode conducting electric current I c (electric current of collector) of components and parts IGBT and the turning-on voltage Vge under different temperatures Tj (IGBT junction temperature).Among Fig. 4, under the constant situation of Vce (voltage between the collector and emitter of IGBT), Tj in 125 ℃ and 25 ℃, the curve (identical physical phenomenon is arranged under remaining temperature) that Ic changes with Vge.Curve shows among Fig. 4 below different temperature, inching Vge just can adjust turn-on consumption (turn-on consumption=Vce*Ic of IGBT.Under the situation that Vge changes, if Vce is constant, then Ic changes.If Ic is constant, then Vce changes.No matter which kind of situation all can be regulated turn-on consumption).
As shown in Figure 2, the temperature of components and parts IGBT Q1, Q2, Q3, Q4 is sent to analog to digital conversion circuit 10 after through temperature sensor 6,7,8,9 perception, gets into programmable logic device 3 then.The size that programmable logic device is adjusted components and parts IGBT turning-on voltage Vge according to the temperature and the relation between the turning-on voltage Vge (being stored in the programmable logic device the inside) of actual measurement.Programmable logic device gives the drive signal of components and parts IGBT Q1, Q2, Q3, Q4 at first through photoisolator, and then carries out digital-to-analogue conversion, and the analog signal after the conversion is adjusted the turning-on voltage Vge of components and parts IGBT through components and parts IGBT drive circuit.
Simultaneously, the described current conversion unit control board of the utility model can also perhaps be adjusted the turning-on voltage Vge of components and parts IGBT according to the signal optimizing that master board sends.When driving the components and parts IGBT of different model, need not change on the current conversion unit control board other components and parts like this.
Claims (4)
1. the current conversion unit control board of a photovoltaic DC-to-AC converter; Said current conversion unit control board is connected between the current conversion unit of master board and said photovoltaic DC-to-AC converter of said photovoltaic DC-to-AC converter; It is the serial communication structure of receiving and sending out; Be defined as the serial communication of receipts by the current conversion unit of the master board of said photovoltaic DC-to-AC converter to said photovoltaic DC-to-AC converter, be defined as the serial communication of sending out by the master board of current conversion unit to the said photovoltaic DC-to-AC converter of said photovoltaic DC-to-AC converter; It is characterized in that:
Said current conversion unit control board comprises fiber optical transceiver, input buffering filter circuit, programmable logic device; The crystal oscillator device that is connected with programmable logic device with the input buffering filter circuit; That be connected with programmable logic device and with said current conversion unit in corresponding address, components and parts address DIP switch, photoisolator, digital to analog converter; Temperature sensor, analog to digital converter and output buffer;
The current conversion unit of said master board to photovoltaic DC-to-AC converter by photovoltaic DC-to-AC converter is defined as the serial communication of receipts; Be to receive the serial communication signals that master board is sent by fiber optical transceiver; Through input buffering filter circuit and connected crystal oscillator device filtering interference signals; Import programmable logic device behind the enhancing signal electric current; Programmable logic device receives and resolves the content of the serial data packet of this serial communication signals, according to the content of serial data packet, after comparing for the address in the serial data packet and said address DIP switch; Send the control commands corresponding signal or send the monitor data signal according to the requirement of serial data packet, this signal is delivered to the current conversion unit of said photovoltaic DC-to-AC converter through photoisolator and digital to analog converter;
The master board of said current conversion unit to photovoltaic DC-to-AC converter by photovoltaic DC-to-AC converter is defined as the serial communication of sending out; Be to be input in the programmable logic device after the temperature of components and parts in the said current conversion unit that is recorded by temperature sensor becomes digital signal through analog to digital converter with analog signal conversion; The requirement of the serial data packet content that programmable logic device sends according to master board sends to the temperature of on off state, voltage, electric current and the actual measurement of components and parts in the said current conversion unit master board of said photovoltaic DC-to-AC converter through output buffer and fiber optical transceiver;
Programmable logic device also sends the signal to this components and parts adjustment turning-on voltage according to the temperature of components and parts in temperature of surveying and the said current conversion unit and the relation of components and parts voltage; The signal of this adjustment turning-on voltage is through photoisolator, and the drive circuit of components and parts is adjusted the turning-on voltage of these components and parts in digital to analog converter and the said current conversion unit.
2. the current conversion unit control board of photovoltaic DC-to-AC converter according to claim 1 is characterized in that, the content of the serial data packet of communications protocol comprises frame head in the said programmable logic device; The current conversion unit address; Order data, data check, reply data and frame end.
3. the current conversion unit control board of photovoltaic DC-to-AC converter according to claim 1 is characterized in that, said input buffering filter circuit comprises buffer and the filter circuit that is made up of logical device series connection that is connected with its output.
4. the current conversion unit control board of photovoltaic DC-to-AC converter according to claim 1 is characterized in that, the components and parts in the said current conversion unit are IGBT electronic devices and components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120521375 CN202364149U (en) | 2011-12-14 | 2011-12-14 | Current converting unit control board of photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120521375 CN202364149U (en) | 2011-12-14 | 2011-12-14 | Current converting unit control board of photovoltaic inverter |
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| Publication Number | Publication Date |
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| CN202364149U true CN202364149U (en) | 2012-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120521375 Withdrawn - After Issue CN202364149U (en) | 2011-12-14 | 2011-12-14 | Current converting unit control board of photovoltaic inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570888A (en) * | 2011-12-14 | 2012-07-11 | 上海嘉翔自动化科技有限公司 | Current conversion unit control board for photovoltaic inverter |
| CN112712689A (en) * | 2020-12-29 | 2021-04-27 | 中车永济电机有限公司 | Multifunctional photoelectric signal acquisition device |
-
2011
- 2011-12-14 CN CN 201120521375 patent/CN202364149U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570888A (en) * | 2011-12-14 | 2012-07-11 | 上海嘉翔自动化科技有限公司 | Current conversion unit control board for photovoltaic inverter |
| CN102570888B (en) * | 2011-12-14 | 2014-08-06 | 上海嘉翔自动化科技有限公司 | Current conversion unit control board for photovoltaic inverter |
| CN112712689A (en) * | 2020-12-29 | 2021-04-27 | 中车永济电机有限公司 | Multifunctional photoelectric signal acquisition device |
| CN112712689B (en) * | 2020-12-29 | 2022-06-14 | 中车永济电机有限公司 | Multifunctional photoelectric signal acquisition device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120801 Effective date of abandoning: 20140806 |
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| RGAV | Abandon patent right to avoid regrant |