CN104080257A - DC centralized power supply dimming monitoring system and method used for public lighting - Google Patents
DC centralized power supply dimming monitoring system and method used for public lighting Download PDFInfo
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Abstract
The invention relates to the technical field of electricity regulation equipment, in particular to a DC centralized power supply dimming monitoring system used for public lighting. The system is characterized by being provided with an AC/DC conversion module, an AC power supply detection module, a control module, a DC power supply detection module, a dimming module and a central controller. Compared with the prior art, the system is especially suitable for public lighting, the energy consumption of lighting devices is lowered, the service life of lamps is prolonged, the daily maintenance cost of the lighting devices is lowered, and the distribution three-phase loads of the lighting devices are balanced.
Description
Technical field:
The present invention relates to power regulation equipment technical field, specifically a kind of be specially adapted to public place illumination with, reduce the energy consumption of lighting device, improve the useful life of light fixture, reduce the regular maintenance cost of lighting device, and can make direct current centrally connected power supply light modulation supervisory control system and the method for public illumination of lighting device distribution threephase load equilibrium.
Background technology:
Public illumination is such as road lighting, park illumination, plaza lighting and the illumination of office building, auditoriums, hotels common part etc., one of public utility that it is maximum as density in city, quantity is maximum, be related to traffic safety and the lives of the people convenient, and become the important component part of modern city view and common people's daily life.In public lighting system, carry out direct current supply---concentrate light modulating device, for energy-saving and emission-reduction, reduce invalid illumination, saves energy has great importance.In general, the supply network of public lighting device is relatively independent, is relatively applicable to the application of direct current supply technology.The Alternating Current Power Supply of comparing, direct current supply has many-sided potential advantages, efficiency is higher, it is mainly reflected in the following aspects: (1) is in direct current transmission and distribution device, the via net loss not causing because transmitting reactive power, also the loss not producing because of kelvin effect, has far below the line loss that exchanges power transmission and distribution; (2) there is no the problems such as frequency stabilization, reactive power and AC charging electric current; (3) DC distribution net also has that electric energy distribution capacity is strong, radius of electricity supply is large, can improve the quality of power supply, be easy to realize the advantages such as distributed power source is interconnected; (4) can solve the unbalanced problem of the common threephase load of public lighting device.
In addition, along with LED light source technology is ripe day by day, LED lamp applications is more and more extensive.But the useful life of LED lamp power drive part is far below the useful life of LED light source itself, be almost its 1/2 to 1/3.Take LED street lamp as example, and the fault of LED light fixture more than 90% occurs in power supply driver AC/DC conversion portion.
Extensively there is at present excess illumination and the large phenomenon of illumination ineffective energy consumption in public illumination.The dead of night often, illuminated place is empty, brilliantly illuminated, has wasted a large amount of electric energy.Take city illumination as example, and for this situation, a lot of places are all in " evening lamp, bright every the small cup " pattern of execution, but this measure causes road surface brightness irregularities, easily causes people's visual fatigue, brings out accident, also runs counter to existing road lighting code requirement.
Summary of the invention:
The problem that the present invention exists current public lighting device, a kind of energy consumption that lighting device was used, reduced in public place illumination that is specially adapted to is proposed, improve the useful life of light fixture, reduce the regular maintenance cost of lighting device, and can make direct current centrally connected power supply light modulation supervisory control system and the method for public illumination of lighting device distribution threephase load equilibrium.
The present invention adopts following technical scheme to reach:
Direct current centrally connected power supply light modulation supervisory control system for a kind of public illumination, it is characterized in that being provided with AC/DC conversion module, AC power detection module, control module, DC power supply detection module, light-adjusting module, communication module and central controller, wherein the input of AC/DC conversion module is connected with outside three-phase alternating-current supply input branch road, output is through the power supply of direct current output branch road DC load, in AC/DC conversion module, be provided with at least one AC/DC converter, AC/DC converter is connected with central controller by the mode of bus;
For detection of the signals collecting end of AC power detection module of the input AC electrical quantity of AC/DC conversion module and A.C. contactor and the AC current transformer on the AC power of AC/DC conversion module input branch road, be connected, and be connected with central controller;
Be used for the control module that receives the instruction of central controller and control peripheral circuit operating state, be connected with the control coil of AC/DC conversion module input/output terminal contactor, and be connected with central processing unit;
DC power supply detection module for detection of AC/DC conversion module output direct current relevant parameter is connected with D.C. contactor and DC current transformer on direct current output branch road, and is connected with central controller;
For receiving the instruction that the external world sends system to, and to the communication module of extraneous appointing system or the real-time status of equipment (such as monitoring central server, designated mobile phone etc.) transfer system and the data of detection, be connected with central controller;
For generation of light modulation instruction and send to the light-adjusting module of dimmable load, logically, be connected with tunable optical driver in load, and be connected with central controller;
For receiving the instruction that the external world sends system to, and to the real-time status of extraneous appointing system or equipment (such as monitoring central server, designated mobile phone etc.) transfer system and the communication module that detects data, be connected with central controller;
For the collaborative work of each parts of coherent system, the central controller of realizing systemic-function is connected with AD/DC conversion module, AC power detection module connects, control module connects, DC power supply detection module connects, light-adjusting module connects, communication module connects;
Direct current centrally connected power supply and a light modulation method for supervising for public illumination, is characterized in that comprising the following steps:
Step 1: system powers on, in holding state.
Step 2: under system standby state, whether normal by AC power detection module and DC power supply detection module monitoring light system mode, if normal, carry out next step, if undesired, send failure alarm signal, and failure alarm signal also should be published to extraneous appointing system or equipment by communication module in real time;
Step 3: the system monitoring order of whether turning on light, if do not have, system continues to keep holding state, if turn on light order, carries out next step.The order of turning on light is by system, to meet the pre-set condition of turning on light to produce;
Step 4: system sends A.C. contactor adhesive order by control module, controls the A.C. contactor adhesive of AC power input branch road, makes AC power feed AC/DC modular converter, and carries out next step;
Step 5: system is by the PORT COM of AC/DC modular converter, whether the work of monitoring AC/DC modular converter is normal, if normal, carry out next step, if undesired, control module is turn-offed A.C. contactor, stops the program of turning on light, the concurrent alarm signal that is out of order, and failure alarm signal also should be published to extraneous appointing system or equipment by communication module in real time;
Step 6: system sends D.C. contactor adhesive order by control module, makes the conducting of DC power supply output branch road, and carries out next step;
Step 7: load obtains electric, bright light operation, and carry out next step;
Step 8: system is under bright light running status, whether normal by AC power detection module and DC power supply detection module monitoring bright light running status, if normal, carry out next step, if undesired, system, according to the difference of abnormality classification, is correspondingly processed according to pre-set program, send failure alarm signal, and failure alarm signal also should be published to extraneous appointing system or equipment by communication module in real time simultaneously;
Step 9: whether system monitoring has dimmer command, if having, carries out next step, if do not have, performs step 12; Dimmer command can be that program presets, also external command.
Step 10: system sends dim signal to the tunable optical driver of load by light-adjusting module, and carries out next step; Load tunable optical driver is according to the dim signal that receives, and regulation output electric current is controlled the power output of lamp load, reaches the object of light modulation;
Step 11: system is by monitoring dimmer command implementation status such as DC power supply detection modules, if step 7 is got back in executed, if do not carry out, or it is undesired to carry out, send failure alarm signal, and failure alarm signal also should be published to extraneous appointing system or equipment by communication module in real time;
Step 12: the system monitoring order of whether turning off the light, if having, carry out next step, if do not have, turn back to step 7; The order of turning off the light can be that program presets, also external command;
Step 13: system is sent and disconnected D.C. contactor order by control module, controls D.C. contactor and turn-offs, and system is turned off the light, and next step is carried out in time delay;
Step 14: system is sent and disconnected A.C. contactor order by control module, controls A.C. contactor and disconnects, and system comes back to step 1 holding state.
Application of the present invention, has the following advantages: (1) can reduce the energy consumption of illuminator.The present invention reduces illuminator energy consumption by two approach, and the one, by direct current centrally connected power supply, reduce the electric energy loss of transmission of electricity link; The 2nd, according to actual illumination needs, utilize the present invention as required lamp load to be carried out to light modulation, saves energy; (2) improve the useful life of light fixture.Because flimsy AC/DC parts concentrate on AC/DC conversion control module, the life-span of light fixture driving power can be greatly improved, thereby improves the useful life of light fixture; (3) reduce the regular maintenance cost of lighting device.Due to the raising of lamp life, the maintenance of lighting device significantly reduces, thereby reduces the regular maintenance cost of public lighting device; (4) also can make in addition lighting device distribution threephase load balance.The present invention can balancedly distribute threephase load, reduces the pollution to AC network.
Accompanying drawing explanation:
Accompanying drawing 1 is structured flowchart of the present invention.
Accompanying drawing 2 is one embodiment of the present invention system diagrams.
Accompanying drawing 3 is workflow diagrams of the present invention
Reference numeral: AC/DC conversion module 1, AC power detection module 2, control module 3, DC power supply detection module 4, light-adjusting module 5 and central controller 6, communication module 7, AC/DC converter 8.
Embodiment:
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As shown in accompanying drawing 1 and accompanying drawing 2, the present invention proposes direct current centrally connected power supply light modulation supervisory control system for a kind of public illumination, it is characterized in that being provided with AC/DC conversion module 1, AC power detection module 2, control module 3, DC power supply detection module 4, light-adjusting module 5 and central controller 6, communication module 7, wherein the input of AC/DC conversion module 1 is connected with outside three-phase alternating-current supply, output is DC load power supply through direct current cables, in AC/DC conversion module 1, be provided with at least one AC/DC converter, the mode of passing through bus of AC/DC converter 8 is connected with central controller 6,
For detection of the signals collecting end of AC power detection module 2 of the input AC electrical quantity of AC/DC conversion module 1 and A.C. contactor and the AC current transformer on the AC power of AC/DC conversion module 1 input branch road, be connected, and be connected with central controller 6;
Be used for the control module 3 that receives the instruction of central controller 6 and control peripheral circuit operating state, be connected with the control coil of AC/DC conversion module 1 input/output terminal contactor, and be connected with central processing unit 6;
DC power supply detection module 4 for detection of AC/DC conversion module 1 output direct current relevant parameter is connected with D.C. contactor and DC current transformer on direct current output branch road, and is connected with central controller 6;
For generation of light modulation instruction and send to the light-adjusting module 5 of dimmable load, be connected with central controller 6;
For receiving the instruction that the external world sends system to, and to the real-time status of extraneous appointing system or equipment (such as monitoring central server, designated mobile phone etc.) transfer system and the communication module 7 that detects data, be connected 6 with central controller;
For the collaborative work of each parts of coherent system, the central controller 6 of realizing systemic-function is connected with AD/DC conversion module 1, AC power detection module 2 connects, control module 3 connects, DC power supply detection module 4 connects, light-adjusting module 5 connects, communication module 7 connects;
Embodiment:
As shown in Figure 2, provided a concrete application case of the present invention, it is characterized in that being provided with a road and exchange input branch road, four road direct current output branch roads, and application the present invention is directed to the supervisory control system that present case arranges.
Exchange input branch road and be provided with circuit breaker Q F, D.C mutual-inductor TA/TB/TC, A.C. contactor KM.The extraneous three-phase alternating-current supply L1/L2/L3 introducing connects respectively AC input terminal U/V/W of the present invention through circuit breaker Q F, D.C mutual-inductor TA/TB/TC, A.C. contactor KM.
Direct current output branch road is provided with DC bus DC+/DC-, D.C. contactor DKM1/DKM2/DKM3/DKM4, and DC current transformer DTA1/DTA2/DTA3/DTA4.DC bus DC+/DC-is connected with direct current output OUT+/OUT-of the present invention, and D.C. contactor DKM1/DKM2/DKM3/DKM4 input is connected with DC bus DC+/DC-, and output is through DC current transformer DTA1/DTA2/DTA3/DTA4 output.
In application case shown in accompanying drawing 2, supervisory control system is provided with AC/DC conversion module, AC power detection module, control module, DC power supply detection module, light-adjusting module, communication module and central controller equally, wherein
AC/DC conversion module is provided with three AC/DC converters, the three-phase input end U/V/W on converter and supervising device ac input end sub-connection, the DC output end sub-connection of output OUT+/OUT-and supervising device.The PORT COM of AC/DC converter is interconnected in the mode of bus, and is connected with central controller, and central controller is by the operation of monitoring bus AC/DC converter.
AC power detection module is provided with alternating voltage detection terminal Ua/Ub/Uc, alternating current detection terminal (Ia1, Ia2)/(Ib1, Ib2)/(Ic1, Ic2), and A.C. contactor state-detection terminal KM.Ua/Ub/Uc is connected with the three-phase output of QF respectively, and (Ia1, Ia2)/(Ib1, Ib2)/(Ic1, Ic2) is connected with the secondary side port of TA/TB/TC respectively, detects the size of current that exchanges input branch road; Terminal KM connects the auxiliary contact of A.C. contactor, detects the state of contactor.
Control module is provided with and exchanges input branch road control port K, direct current output branch road control port DK1/DK2/DK3/DK4.K is connected with the control coil that exchanges the A.C. contactor KM of input branch road, controls adhesive/disconnection of KM; DK1/DK2/DK3/DK4 is connected with the control coil of the D.C. contactor DKM1/DKM2/DKM3/DKM4 of direct current output branch road respectively, the adhesive/disconnection of control D.C. contactor.
DC power supply detection module is provided with direct current detection terminal (DI11, DI12)/(DI21, DI22)/(DI31, DI32)/(DI41, DI42), and D.C. contactor state-detection terminal DKM1/DKM2/DKM3/DKM4.(DI11, DI12)/(DI21, DI22)/(DI31, DI32)/(DI41, DI42) is connected with the secondary side port that direct current is exported the DC current transformer DTA1/DTA2/DTA3/DTA4 on branch road, detects the size of current of direct current output branch road; Terminal DKM1/DKM2/DKM3/DKM4 is connected with the D.C. contactor auxiliary contact on the road of direct current output respectively, detects the state of D.C. contactor.
Light-adjusting module is connected with central controller, receives the instruction of central controller, produces dim signal, sends to tunable optical lamp load.
Communication module is connected with central controller, receives the extraneous instruction sending, and to the real-time status of extraneous appointing system or equipment (such as monitoring central server, designated mobile phone etc.) transfer system and detect data.
Central controller AD/DC conversion module connects, AC power detection module connects, control module connects, DC power supply detection module connects, light-adjusting module connects, communication module connects; Collaborative work with for each parts of coherent system, realizes systemic-function.
As shown in Figure 3, the direct current centrally connected power supply in this application case and light modulation method for supervising, is characterized in that comprising the following steps:
Step 1: system powers on, in holding state.
Step 2: under system standby state, by the voltage detection terminal Ua/Ub/Uc of AC power detection module, current detecting terminal (Ia1, Ia2)/(Ib1, Ib2)/(Ic1, Ic2) and A.C. contactor state-detection terminal KM detect respectively whether normal/electric current whether normal (being zero)/A.C. contactor whether normal (disconnection) of alternating voltage; Whether normally direct current detection terminal (DI11, DI12)/(DI21, DI22)/(DI31, DI32)/(DI41, DI42) and D.C. contactor state-detection terminal DKM1/DKM2/DKM3/DKM4 by DC power supply detection module detect direct current branch electric current whether normal (being zero)/D.C. contactor (disconnection); If normal, carry out next step, if undesired, according to abnormal contents, send failure alarm signal, and failure alarm signal is also published to extraneous appointing system or equipment by communication module in real time;
Step 3: the system monitoring order of whether turning on light, if do not have, system continues to keep holding state, if turn on light order, carries out next step.The order of turning on light is by system, to meet the pre-set condition of turning on light to produce;
Step 4: system sends A.C. contactor adhesive order by the K terminal of control module, controls the A.C. contactor KM adhesive of AC power input branch road, makes AC power feed AC/DC modular converter, and AC/DC modular converter is started working, and carries out next step;
Step 5: system is by the PORT COM of AC/DC modular converter, whether the work of monitoring AC/DC modular converter is normal, if normal, carry out next step, if undesired, control module is turn-offed A.C. contactor by terminal K, stops the program of turning on light, the concurrent alarm signal that is out of order, and failure alarm signal also should be published to extraneous appointing system or equipment by communication module in real time;
Step 6: system sends D.C. contactor DKM1/DKM2/DKM3/DKM4 adhesive order by control module DK1/DK2/DK3/DK4 terminal, makes the conducting of DC power supply output branch road, and carries out next step;
Step 7: load obtains electric, bright light operation, and carry out next step;
Step 8: system is under bright light running status, by the voltage detection terminal Ua/Ub/Uc of AC power detection module, current detecting terminal (Ia1, Ia2)/(Ib1, Ib2)/(Ic1, Ic2) and A.C. contactor state-detection terminal KM detect respectively whether whether normal (the operating current)/A.C. contactor of normal/electric current whether normal (closure) of alternating voltage; And detect whether normal (the operating current)/D.C. contactor of direct current branch electric current whether normally (closure) by direct current detection terminal (DI11, DI12)/(DI21, DI22)/(DI31, DI32)/(DI41, DI42) and the D.C. contactor state-detection terminal DKM1/DKM2/DKM3/DKM4 of DC power supply detection module; Whether normally monitor bright light running status, if normal, carry out next step, if undesired, system is according to abnormal contents, according to pre-set program, be correspondingly processed, send failure alarm signal simultaneously, and failure alarm signal also should be published to extraneous appointing system or equipment by communication module in real time;
Step 9: whether system monitoring has dimmer command, if having, carries out next step, if do not have, performs step 12; Dimmer command can be that program presets, also external command.
Step 10: system sends dim signal to the tunable optical driver of load by light-adjusting module, and carries out next step; Load tunable optical driver is according to the dim signal that receives, and regulation output electric current is controlled the power output of lamp load, reaches the object of light modulation;
Step 11: whether normally direct current detection terminal (DI11, DI12)/(DI21, DI22)/(DI31, DI32)/(DI41, the DI42) that system is passed through DC power supply detection module by DC power supply detection module detect direct current branch electric current (light modulation electric current), monitoring dimmer command implementation status, if normal, get back to step 7, if undesired, send failure alarm signal, and failure alarm signal also should be published to extraneous appointing system or equipment by communication module in real time;
Step 12: the system monitoring order of whether turning off the light, if having, carry out next step, if do not have, turn back to step 7; The order of turning off the light can be that program presets, also external command;
Step 13: system sends the order of disconnection D.C. contactor by the DK1/DK2/DK3/DK4 terminal of control module, controls D.C. contactor DKM1/DKM2/DKM3/DKM4 and turn-offs, and system is turned off the light, and next step is carried out in time delay;
Step 14: system is sent and disconnected A.C. contactor order by control module K terminal, controls A.C. contactor KM and disconnects, and system comes back to step 1 holding state.
The present invention compared with prior art, has the following advantages: (1) reduces the energy consumption of lighting device.The present invention reduces lighting device energy consumption by two approach, and the one, by direct current supply, reduce the electric energy loss of transmission of electricity link; The 2nd, according to actual illumination needs, utilize the present invention as required light fixture to be carried out to switch lamp and brightness adjustment control, saves energy; (2) improve the useful life of light fixture.Because flimsy AC/DC parts concentrate on AC/DC conversion control unit, the life-span of light fixture driving power can be greatly improved, thereby improves the useful life of light fixture; (3) reduce the regular maintenance cost of lighting device.Due to the raising of lamp life, the maintenance of lighting device significantly reduces, thereby reduces the regular maintenance cost of public lighting device; (4) also can make in addition lighting device distribution threephase load balance.The present invention can balancedly distribute threephase load, reduces the pollution to AC network.
Claims (3)
1. a direct current centrally connected power supply light modulation supervisory control system for public illumination, is characterized in that being provided with AC/DC conversion module, AC power detection module, control module, DC power supply detection module, light-adjusting module, communication module and central controller, wherein
The input of AC/DC conversion module is connected with outside three-phase alternating-current supply input branch road, output is through the power supply of direct current output branch road DC load, in AC/DC conversion module, be provided with at least one AC/DC converter, AC/DC converter is connected with central controller by the mode of bus;
For detection of the signals collecting end of AC power detection module of the input AC electrical quantity of AC/DC conversion module and A.C. contactor and the AC current transformer on the AC power of AC/DC conversion module input branch road, be connected, and be connected with central controller;
Be used for the control module that receives the instruction of central controller and control peripheral circuit operating state, be connected with the control coil of AC/DC conversion module input/output terminal contactor, and be connected with central processing unit;
DC power supply detection module for detection of AC/DC conversion module output direct current relevant parameter is connected with D.C. contactor and DC current transformer on direct current output branch road, and is connected with central controller;
For receiving the instruction that the external world sends system to, and to the communication module of extraneous appointing system or the real-time status of equipment transfer system and the data of detection, be connected with central controller;
For generation of light modulation instruction and send to the light-adjusting module of dimmable load, logically, be connected with tunable optical driver in load, and be connected with central controller;
For receiving the instruction that the external world sends system to, and to the real-time status of extraneous appointing system or equipment transfer system and the communication module that detects data, be connected with central controller;
For the collaborative work of each parts of coherent system, the central controller of realizing systemic-function is connected with AD/DC conversion module, AC power detection module connects, control module connects, DC power supply detection module connects, light-adjusting module connects, communication module connects.
According to claim 1 described direct current centrally connected power supply light modulation supervisory control system for public illumination, it is characterized in that being arranged on for illumination during control cabinet, control cubicle or case become.
3. a direct current centrally connected power supply light modulation method for supervising for public illumination, is characterized in that comprising the following steps:
Step 1: system powers on, in holding state.
Step 2: under system standby state, whether normal by AC power detection module and DC power supply detection module monitoring light system mode, if normal, carry out next step, if undesired, send failure alarm signal, and failure alarm signal also should be published to extraneous appointing system or equipment by communication module in real time;
Step 3: the system monitoring order of whether turning on light, if do not have, system continues to keep holding state, if turn on light order, carries out next step.The order of turning on light is by system, to meet the pre-set condition of turning on light to produce;
Step 4: system sends A.C. contactor adhesive order by control module, controls the A.C. contactor adhesive of AC power input branch road, makes AC power feed AC/DC modular converter, and carries out next step;
Step 5: system is by the PORT COM of AC/DC modular converter, whether the work of monitoring AC/DC modular converter is normal, if normal, carry out next step, if undesired, control module is turn-offed A.C. contactor, stops the program of turning on light, the concurrent alarm signal that is out of order, and failure alarm signal also should be published to extraneous appointing system or equipment by communication module in real time;
Step 6: system sends D.C. contactor adhesive order by control module, makes the conducting of DC power supply output branch road, and carries out next step;
Step 7: load obtains electric, bright light operation, and carry out next step;
Step 8: system is under bright light running status, whether normal by AC power detection module and DC power supply detection module monitoring bright light running status, if normal, carry out next step, if undesired, system, according to the difference of abnormality classification, is correspondingly processed according to pre-set program, send failure alarm signal, and failure alarm signal also should be published to extraneous appointing system or equipment by communication module in real time simultaneously;
Step 9: whether system monitoring has dimmer command, if having, carries out next step, if do not have, performs step 12; Dimmer command can be that program presets, also external command.
Step 10: system sends dim signal to the tunable optical driver of load by light-adjusting module, and carries out next step; Load tunable optical driver is according to the dim signal that receives, and regulation output electric current is controlled the power output of lamp load, reaches the object of light modulation;
Step 11: system is by monitoring dimmer command implementation status such as DC power supply detection modules, if step 7 is got back in executed, if do not carry out, or it is undesired to carry out, send failure alarm signal, and failure alarm signal also should be published to extraneous appointing system or equipment by communication module in real time;
Step 12: the system monitoring order of whether turning off the light, if having, carry out next step, if do not have, turn back to step 7; The order of turning off the light can be that program presets, also external command;
Step 13: system is sent and disconnected D.C. contactor order by control module, controls D.C. contactor and turn-offs, and system is turned off the light, and next step is carried out in time delay;
Step 14: system is sent and disconnected A.C. contactor order by control module, controls A.C. contactor and disconnects, and system comes back to step 1 holding state.
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| CN201410334879.3A CN104080257B (en) | 2014-07-15 | 2014-07-15 | Public illumination direct current centrally connected power supply dims monitoring system and method |
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| CN201410334879.3A CN104080257B (en) | 2014-07-15 | 2014-07-15 | Public illumination direct current centrally connected power supply dims monitoring system and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332952A (en) * | 2014-10-23 | 2015-02-04 | 苏州市吴中区大陆电子设备厂 | Power distribution system for transformer |
| CN104333233A (en) * | 2014-10-23 | 2015-02-04 | 苏州市吴中区大陆电子设备厂 | Power distribution circuit for transformer |
| CN107454725A (en) * | 2017-09-27 | 2017-12-08 | 中船第九设计研究院工程有限公司 | A kind of ship's space modular optical environmental system |
| CN113938030A (en) * | 2021-09-26 | 2022-01-14 | 华为数字能源技术有限公司 | AC/DC converter and charging device |
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