CN214412311U - High-power direct current remote supply system - Google Patents
High-power direct current remote supply system Download PDFInfo
- Publication number
- CN214412311U CN214412311U CN202023331960.6U CN202023331960U CN214412311U CN 214412311 U CN214412311 U CN 214412311U CN 202023331960 U CN202023331960 U CN 202023331960U CN 214412311 U CN214412311 U CN 214412311U
- Authority
- CN
- China
- Prior art keywords
- diode
- direct current
- capacitor
- bridge inverter
- anode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Landscapes
- Inverter Devices (AREA)
Abstract
The utility model discloses a high-power direct current remote supply system, include: the local side conversion equipment comprises a power factor correction unit and a switching regulator unit; the far-end conversion equipment comprises a filter, a high-frequency full-bridge resonant converter and an alternating current transformer; the alternating current transformer comprises a first part and a second part, and the first part is connected with the high-frequency full-bridge resonant converter; one end of the second part is connected with the anode of the first diode, and the other end of the second part is connected with the cathode of the second diode; the cathode of the first diode is connected with the half-bridge inverter, and the anode of the second diode is connected with the half-bridge inverter; the first lead is connected with the second part and the half-bridge inverter, and a zero line is connected between the second part and the half-bridge inverter; one end of the coil is connected with the half-bridge inverter, and the other end of the coil is connected with the live wire; the local side conversion equipment is connected with a mains supply and is converted into high-voltage direct current, the high-voltage direct current is connected with the far-end conversion equipment in a long distance, the far-end equipment converts the high-voltage direct current into alternating current, and the direct current input and the alternating current output can be electrically isolated without single-point faults.
Description
Technical Field
The utility model relates to a power supply field, more specifically relates to a high-power direct current remote supply system.
Background
The direct current remote power supply has the advantages of high power transmission efficiency, low cost of a power transmission line, safety, controllability and the like, and is widely applied to power supply of RRU (radio remote unit) equipment, an indoor subsystem, a low-power-consumption base station, an outdoor base station, a repeater and other equipment of a mobile communication network. In the prior art, an existing central office side direct current-48V basic power supply is boosted into high-voltage direct current through a central office side device, and the high-voltage direct current is transmitted to a far-end load device side, and then is transformed into standard input voltage required by the load device to supply power to the far-end (load) device. However, the direct current remote supply system needs direct current power supply, but the commercial power is power frequency alternating current and cannot be directly used, and with the development of 5G communication, the power requirement of a switching regulator unit in the local-side equipment is higher and higher, a plurality of modules in the local-side equipment are connected in parallel, and different modules have differences, so that the distribution of the running current of the modules connected in parallel is uneven, and the reliability is reduced.
Therefore, it is an urgent need to provide a high-power dc remote supply system.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a high-power direct current remote supply system, include:
a local side conversion device and a far side conversion device,
the office-side conversion device includes a digital signal processor,
the power factor correction unit is connected with the switching regulator unit;
the far-end transformation device comprises a remote transformation device,
the filter is connected with the high-frequency full-bridge resonant converter;
one end of the high-frequency full-bridge resonant converter is connected with the filter, and the other end of the high-frequency full-bridge resonant converter is connected with the alternating current transformer;
the alternating current transformer comprises a first part and a second part, the first part is connected with the second part, and the first part is connected with the high-frequency full-bridge resonant converter;
one end of the second part is connected with the anode of the first diode, and the other end of the second part is connected with the cathode of the second diode;
the cathode of the first diode is connected with the half-bridge inverter, and the anode of the second diode is connected with the half-bridge inverter;
one end of the first lead is connected with the second part, the other end of the first lead is connected with the half-bridge inverter, the first lead is connected with a zero line between the second part and the half-bridge inverter, and the joint of the first lead and the zero line is a first connecting point;
one end of the coil is connected with the half-bridge inverter, and the other end of the coil is connected with a live wire;
and one end of the first capacitor is connected with the zero line, and the other end of the first capacitor is connected with the live line.
Preferably, a third diode and a fourth diode are further included;
the cathode of the third diode is connected with the anode of the first diode, and the anode of the third diode is connected with the anode of the second diode;
and the cathode of the fourth diode is connected with the cathode of the first diode, and the anode of the fourth diode is connected with the cathode of the second diode.
Preferably, a second capacitor and a third capacitor are further included;
one end of the second capacitor is connected with the cathode of the first diode, the other end of the second capacitor is connected with the first lead between the second part and the first connecting point, and the connecting position of the first lead and the second capacitor is a second connecting point;
one end of the third capacitor is connected with the second connection point, and the other end of the third capacitor is connected with the anode of the second diode.
Preferably, a control switch is arranged at one end of the live wire close to the first capacitor.
Preferably, the filter is an electromagnetic interference power filter.
Preferably, the half-bridge inverter outputs 220 vac.
Compared with the prior art, the utility model provides a high-power direct current remote supply system has realized following beneficial effect at least:
1. the utility model provides a local side transformation equipment of high-power direct current remote supply system includes power factor correction unit and switching regulator unit, and power factor correction unit makes the phase place of input current the same with input voltage to filter the non-sinusoidal input current of high harmonic content; the switch regulator unit completes voltage conversion, and the switch regulator unit in the local side conversion equipment can be connected in parallel to form an N +1 power supply structure, so that no single-point fault is strictly realized.
2. The utility model provides a first diode is anodal in second portion one end connection in the high-power direct current remote supply system, and the second diode negative pole is connected to the other end, guarantees that the electric current of second portion transmission can be transmitted to the direction of negative pole along first diode positive pole.
3. The utility model provides a far-end transform equipment of high-power direct current remote supply system can realize direct current input and the complete electric isolation of alternating current output.
Of course, it is not necessary for any product of the present invention to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of a far-end transformation apparatus provided by the present invention;
fig. 2 is a schematic structural diagram of a local side conversion device provided by the present invention;
fig. 3 is a circuit diagram of a power factor correction unit in the local side conversion device according to the present invention;
fig. 4 is a circuit diagram of a switching regulator unit in the local side conversion device of the present invention;
the power factor correction device comprises a 1-local side conversion device, a 2-power factor correction unit, a 3-switching regulator unit, a 4-far end conversion device, a 5-filter, a 6-high frequency full bridge resonant converter, a 7-alternating current transformer, a 8-first part, a 9-second part, a 10-first diode, a 11-second diode, a 12-third diode, a 13-fourth diode, a 14-half bridge inverter, a 15-first lead, a 16-coil, a 17-first capacitor, an 18-live wire, a 19-zero wire, a 20-second capacitor, a 21-third capacitor and a 22-control switch.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Example 1
A specific embodiment of the high power dc remote supply system according to the present invention is described below with reference to fig. 1 and fig. 2, which includes: a local side conversion device 1 and a far side conversion device 4,
the office-side conversion apparatus 1 includes,
the power factor correction unit 2 and the switching regulator unit 3, wherein the power factor correction unit 2 is connected with the switching regulator unit 3; the power factor correction unit 2 makes the phase of the input current and the input voltage the same, thereby filtering the non-sinusoidal input current with high harmonic content; the switching regulator unit 3 completes voltage conversion, and the switching regulator unit 3 in the local side conversion device 1 can be connected in parallel to form an N +1 power supply structure, so that no single-point fault is realized in a strict sense.
The far-end transformation device 4 comprises,
the filter 5, the filter 5 is connected with the high-frequency full-bridge resonant converter 6;
one end of the high-frequency full-bridge resonant converter 6 is connected with the filter 5, and the other end of the high-frequency full-bridge resonant converter is connected with the alternating current transformer 7; the operating frequency of the high frequency full bridge resonant converter 6 is typically greater than 100 KHz.
The alternating current transformer 7, the alternating current transformer 7 includes the first part 8 and the second part 9, the first part 8 is connected with the high-frequency full-bridge resonant converter 6; the direct current input and the alternating current output can be completely and electrically isolated.
One end of the second part 9 is connected with the anode of a first diode 10, and the other end is connected with the cathode of a second diode 11;
the negative electrode of the first diode 10 is connected with the half-bridge inverter 14, and the positive electrode of the second diode 11 is connected with the half-bridge inverter 14;
it is ensured that the current delivered by the second part 9 can be delivered in the direction from the anode to the cathode of the first diode 10.
A first lead 15, one end of which is connected with the second part 9, the other end of which is connected with the half-bridge inverter 14, wherein the first lead 15 is connected with a zero line 19 between the second part 9 and the half-bridge inverter 14, and the joint of the first lead 15 and the zero line 19 is a first connecting point;
a coil 16, one end of which is connected with the half-bridge inverter 14 and the other end of which is connected with a live wire 18;
the first capacitor 17 has one end connected to the neutral line 19 and the other end connected to the live line 18.
A power factor correction unit 2 in the local side conversion equipment 1 filters non-sinusoidal input current with high harmonic content, converts alternating current into direct current, and a switching regulator unit 3 regulates the direct current; the distance between the far-end transformation equipment 4 and the local-side transformation equipment 1 can be set according to actual requirements, and the far-end transformation equipment 4 is remotely connected with the local-side transformation equipment 1; the regulated direct current is subjected to electromagnetic interference suppression through a filter 5, particularly noise in a power supply circuit or a control signal circuit, is transmitted to a high-frequency full-bridge resonant converter 6, is isolated and output to a half-bridge inverter 14 through an alternating current transformer 7, the half-bridge inverter 14 converts the direct current into 220-volt alternating current, and frequency points of specific frequency or frequencies except the specific frequency points are effectively filtered through a filtering combination formed by a coil 16 and a first capacitor 17.
Another specific embodiment of the high power dc remote supply system according to the present invention is described below with reference to fig. 1, fig. 2, fig. 3 and fig. 4.
Example 2
This is another specific embodiment of the present invention, including: a local side conversion device 1 and a far side conversion device 4,
the office-side conversion apparatus 1 includes,
the power factor correction unit 2 and the switching regulator unit 3, wherein the power factor correction unit 2 is connected with the switching regulator unit 3; the power factor correction unit 2 makes the phase of the input current and the input voltage the same, thereby filtering the non-sinusoidal input current with high harmonic content; the switching regulator unit 3 completes voltage conversion, and the switching regulator unit 3 in the local side conversion device 1 can be connected in parallel to form an N +1 power supply structure, so that no single-point fault is realized in a strict sense.
The power factor correction unit 2 follows the principle of the main topology of three-phase vienna power factor correction, and the switching regulator unit 3 follows the principle of DCDC (direct current to direct current).
The far-end transformation device 4 comprises,
the filter 5, the filter 5 is connected with the high-frequency full-bridge resonant converter 6; the filter 5 is an electromagnetic interference power filter.
One end of the high-frequency full-bridge resonant converter 6 is connected with the filter 5, and the other end of the high-frequency full-bridge resonant converter is connected with the alternating current transformer 7;
the operating frequency of the high frequency full bridge resonant converter 6 is typically greater than 100 KHz.
The alternating current transformer 7, the alternating current transformer 7 includes the first part 8 and the second part 9, the first part 8 is connected with the high-frequency full-bridge resonant converter 6; the direct current input and the alternating current output can be completely and electrically isolated.
One end of the second part 9 is connected with the anode of a first diode 10, and the other end is connected with the cathode of a second diode 11;
the negative electrode of the first diode 10 is connected with the half-bridge inverter 14, and the positive electrode of the second diode 11 is connected with the half-bridge inverter 14;
it is ensured that the current delivered by the second part 9 can be delivered in the direction from the anode to the cathode of the first diode 10.
The half-bridge inverter 14 outputs 220 vac.
A third diode 12 and a fourth diode 13; a conduction circuit that increases current.
The cathode of the third diode 12 is connected with the anode of the first diode 10, and the anode is connected with the anode of the second diode 11;
the cathode of the fourth diode 13 is connected with the cathode of the first diode 10, and the anode is connected with the cathode of the second diode 11.
A first lead 15, one end of which is connected with the second part 9, the other end of which is connected with the half-bridge inverter 14, wherein the first lead 15 is connected with a zero line 19 between the second part 9 and the half-bridge inverter 14, and the joint of the first lead 15 and the zero line 19 is a first connecting point;
a coil 16, one end of which is connected with the half-bridge inverter 14 and the other end of which is connected with a live wire 18;
the first capacitor 17 has one end connected to the neutral line 19 and the other end connected to the live line 18.
The live line 18 is provided with a control switch 22 near one end of the first capacitor 17. The connection of the control circuit is facilitated.
A second capacitor 20 and a third capacitor 21;
a second capacitor 20, one end of which is connected with the cathode of the first diode 10, and the other end of which is connected with the first wire 15 between the second part 9 and the first connection point, wherein the connection point of the first wire 15 and the second capacitor 20 is a second connection point;
one end of the third capacitor 21 is connected to the second connection point, and the other end is connected to the anode of the second diode 11.
The second capacitor 20 and the third capacitor 21 are arranged to prevent the high-frequency signal and the power frequency signal from generating intermodulation on the diode, so that an interference signal is generated to interfere the normal operation of the equipment.
A power factor correction unit 2 in the local side conversion equipment 1 filters non-sinusoidal input current with high harmonic content, converts alternating current into direct current, and a switching regulator unit 3 boosts the direct current, wherein the range of direct current voltage is +/-200 volts to +/-380 volts; the local side conversion equipment 1 inherits the modularized design concept, adopts the DSP (digital signal processing) digital control technology and the high-frequency soft switching technology, and has high reliability; a DSP (digital signal processing) controller is adopted to take charge of control, switching, parallel algorithm, fault processing and the like of the whole module, and the system has good consistency and strong anti-interference capability. By adopting the autonomous current sharing technology, the system consisting of the parallel modules completely realizes no single-point fault in a strict sense, and the parallel modules can also form a high-reliability N +1 power supply system. The automatic current sharing technology realizes automatic load current distribution among modules, and if a module fails in operation, the failed module automatically quits the system without influencing the normal work of the whole system. The distance between the far-end conversion equipment 4 and the local side conversion equipment 1 can be set according to actual requirements, the far-end conversion equipment 4 is connected with the local side conversion equipment 1 in a long distance, and loss is caused in the transmission process; the boosted direct current passes through a filter 5 of a remote device, the filter 5 is an EMI (electromagnetic interference) filter, electromagnetic interference is suppressed, particularly noise in a power supply circuit or a control signal circuit is transmitted to a high-frequency full-bridge resonant converter 6, the high-frequency full-bridge resonant converter 6 is an LLC (resonant circuit) high-frequency full-bridge resonant converter 6, the noise is isolated and output to a half-bridge inverter 14 through an alternating current transformer 7, the only current flowing direction is determined by a first diode 10 and a second diode 11 in the transmission process, the half-bridge inverter 14 converts the direct current into 220V alternating current, and the frequency points of specific frequency or frequencies except the specific frequency points are effectively filtered through a filtering combination formed by a coil 16 and a first capacitor 17. The remote converting apparatus 4 adopts an apparatus link structure of DC/DC and DC/AC, in which the preceding stage DC/DC realizes isolation of direct current input and alternating current output. The DC/DC conversion adopts LLC (resonant circuit) soft switching.
According to the above embodiment, the utility model provides a high-power direct current remote supply system has realized following beneficial effect at least:
1. the utility model provides a local side transformation equipment of high-power direct current remote supply system includes power factor correction unit and switching regulator unit, and power factor correction unit makes the phase place of input current the same with input voltage to filter the non-sinusoidal input current of high harmonic content; the switch regulator unit completes voltage conversion, and the switch regulator unit in the local side conversion equipment can be connected in parallel to form an N +1 power supply structure, so that no single-point fault is strictly realized.
2. The utility model provides a first diode is anodal in second portion one end connection in the high-power direct current remote supply system, and the second diode negative pole is connected to the other end, guarantees that the electric current of second portion transmission can be transmitted to the direction of negative pole along first diode positive pole.
3. The utility model provides a far-end transform equipment of high-power direct current remote supply system can realize direct current input and the complete electric isolation of alternating current output.
Although certain specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (6)
1. A high-power direct current remote supply system is characterized by comprising:
a local side conversion device and a far side conversion device,
the office-side conversion device includes a digital signal processor,
the power factor correction unit is connected with the switching regulator unit;
the far-end transformation device comprises a remote transformation device,
the filter is connected with the high-frequency full-bridge resonant converter;
one end of the high-frequency full-bridge resonant converter is connected with the filter, and the other end of the high-frequency full-bridge resonant converter is connected with the alternating current transformer;
the alternating current transformer comprises a first part and a second part, the first part is connected with the second part, and the first part is connected with the high-frequency full-bridge resonant converter;
one end of the second part is connected with the anode of the first diode, and the other end of the second part is connected with the cathode of the second diode;
the cathode of the first diode is connected with the half-bridge inverter, and the anode of the second diode is connected with the half-bridge inverter;
one end of the first lead is connected with the second part, the other end of the first lead is connected with the half-bridge inverter, the first lead is connected with a zero line between the second part and the half-bridge inverter, and the joint of the first lead and the zero line is a first connecting point;
one end of the coil is connected with the half-bridge inverter, and the other end of the coil is connected with a live wire;
and one end of the first capacitor is connected with the zero line, and the other end of the first capacitor is connected with the live line.
2. The high power direct current remote supply system according to claim 1, further comprising a third diode and a fourth diode;
the cathode of the third diode is connected with the anode of the first diode, and the anode of the third diode is connected with the anode of the second diode;
and the cathode of the fourth diode is connected with the cathode of the first diode, and the anode of the fourth diode is connected with the cathode of the second diode.
3. The high-power direct-current remote supply system according to claim 2, further comprising a second capacitor and a third capacitor;
one end of the second capacitor is connected with the cathode of the first diode, the other end of the second capacitor is connected with the first lead between the second part and the first connecting point, and the connecting position of the first lead and the second capacitor is a second connecting point;
one end of the third capacitor is connected with the second connection point, and the other end of the third capacitor is connected with the anode of the second diode.
4. The high power direct current remote supply system according to claim 1, wherein a control switch is provided at an end of the live line near the first capacitor.
5. The high power direct current remote supply system according to claim 1, wherein the filter is an electromagnetic interference power filter.
6. The high power direct current remote supply system according to claim 1, wherein the half bridge inverter outputs 220V alternating voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023331960.6U CN214412311U (en) | 2020-12-31 | 2020-12-31 | High-power direct current remote supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023331960.6U CN214412311U (en) | 2020-12-31 | 2020-12-31 | High-power direct current remote supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214412311U true CN214412311U (en) | 2021-10-15 |
Family
ID=78043641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023331960.6U Active CN214412311U (en) | 2020-12-31 | 2020-12-31 | High-power direct current remote supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214412311U (en) |
-
2020
- 2020-12-31 CN CN202023331960.6U patent/CN214412311U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4322250B2 (en) | Transformer-less grid-connected power conversion circuit | |
| CN100507590C (en) | Multiple input path modular high frequency isolation single phase power feedback type electronic load | |
| CN1808832B (en) | Circuit apparatus applicable to middle and high power UPS | |
| CN201072438Y (en) | Multi-input channel modularized high-frequency isolation single phase electric energy feedback type electronic load | |
| CN102025145B (en) | Bidirectional chopper-based direct current active power filter and control method thereof | |
| US9906169B1 (en) | DC-AC conversion circuit having a first double ended DC pulse stage and a second AC stage | |
| CN102291014A (en) | Alternating-current chopping-full-bridge rectification AC-DC (alternating current-to-direct current) converter | |
| EP2882090A1 (en) | Single-phase fullbridge inverter with switchable output filter | |
| CN114123268A (en) | Concentrated conversion high-frequency boosting thermal power energy storage system | |
| CN104578455A (en) | Novel high-power wireless charging system and control method thereof | |
| CN214412311U (en) | High-power direct current remote supply system | |
| CN209345007U (en) | Frequency conversion light modulator based on PFC and T-type inverter circuit | |
| CN102222966A (en) | Uninterrupted power supply | |
| CN112736958A (en) | High-power direct current remote supply system | |
| CN209845399U (en) | Variable-frequency dimmer based on Vienna PFC and full-bridge inverter circuit | |
| CN209435131U (en) | Frequency conversion light modulator based on Vienna PFC and three-level inverter circuit | |
| CN208782738U (en) | It is a kind of based on magnetic switch control distributed electrical source device, charging pile, charger, protection circuit device | |
| Ferreira et al. | Alternative power distribution in residential and commercial buildings | |
| CN203057066U (en) | Feedforward compensation energy-saving control converter | |
| CN217335440U (en) | Low common mode interference's intermediate frequency static power supply circuit | |
| CN104218809A (en) | A circuit device integrating power factor correction and DC-DC conversion | |
| CN213879295U (en) | Local side power supply and alternating current remote power supply system | |
| CN218772026U (en) | Coupling device for photovoltaic module level communication | |
| CN216794637U (en) | Concentrated conversion high-frequency boosting thermal power energy storage system | |
| CN209345019U (en) | Frequency conversion light modulator based on dual switch PFC and full-bridge inverter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |