CN112583281A - AC voltage-regulating power supply - Google Patents
AC voltage-regulating power supply Download PDFInfo
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- CN112583281A CN112583281A CN202011359158.XA CN202011359158A CN112583281A CN 112583281 A CN112583281 A CN 112583281A CN 202011359158 A CN202011359158 A CN 202011359158A CN 112583281 A CN112583281 A CN 112583281A
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- module
- adjusting knob
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
- H05K7/20918—Forced ventilation, e.g. on heat dissipaters coupled to components the components being isolated from air flow, e.g. hollow heat sinks, wind tunnels or funnels
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The invention discloses an alternating current voltage-regulating power supply which comprises a shell, wherein an input module, an input circuit switch module, an IGBT module, a regulation and control module, a display module, a transformer, a voltage stabilizing circuit module, a protection circuit module, an output circuit switch module and an output module are arranged in the shell. This alternating current voltage regulation power supply, through setting gradually input switch and output switch at the output kneck and the output kneck of device, thereby make the device when not using, can be through input switch and output switch with the power in its device temporarily disconnection, make the device can not be in operating condition for a long time to a certain extent, thereby the practicality life-span of device has been improved greatly, voltage stabilizing circuit module and protection circuit module have been added in the device simultaneously, transformer and IGBT module have been avoided when the switch to a certain extent, high frequency interference is too big, lead to driven out of control, cause the problem of alternating current voltage regulation power supply damage.
Description
Technical Field
The invention relates to the technical field of alternating-current voltage-regulating power supplies, in particular to an alternating-current voltage-regulating power supply.
Background
The alternating current voltage regulating power supply outputs pure sine waves by alternating current (AC → DC → AC) conversion in commercial power, and the output frequency and voltage are adjustable within a certain range. It is different from frequency-changing speed-regulating controller for motor speed regulation and common AC voltage-stabilizing power supply. The ideal AC power supply features stable frequency, stable voltage, zero internal resistance and pure sine wave voltage waveform (no distortion). The alternating current voltage-regulating power supply is very close to an ideal alternating current power supply, so that advanced and developed countries increasingly use the variable frequency power supply as a standard power supply so as to provide the most excellent power supply environment for electrical appliances and be convenient for objectively examining the technical performance of the electrical appliances.
However, the existing ac voltage-regulating power supply generally adopts a method of directly and sequentially connecting frequency conversion elements in the device, and has no any cutoff switch, so that the device is in an operating state for a long time, and the fatigue of the elements is caused, thereby causing the low service life of the device; meanwhile, for an internal zero-crossing detection circuit, because a transformer and an IGBT (insulated gate bipolar transistor) are not provided with a voltage stabilizing circuit and a protection circuit when being switched on and switched off, high-frequency interference is large, real zero-crossing points are easily lost, drive is out of control, and an alternating-current voltage-regulating power supply is damaged.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an alternating current voltage-regulating power supply, which solves the problems that the prior alternating current voltage-regulating power supply generally adopts a method of directly and sequentially connecting frequency conversion elements in the device, and has no any cutoff switch, so that the device is in an operating state for a long time, the elements are weak, and the service life of the device is low; meanwhile, for an internal zero-crossing detection circuit, because a transformer and an IGBT (insulated gate bipolar transistor) are not provided with a voltage stabilizing circuit and a protection circuit when being switched on and switched off, high-frequency interference is large, real zero-crossing points are easily lost, drive is out of control, and the problem that an alternating-current voltage-regulating power supply is damaged is caused.
In order to achieve the purpose, the invention adopts the following technical scheme:
an alternating current voltage-regulating power supply comprises a shell, wherein an input module, an input circuit switch module, an IGBT module, a regulation and control module, a display module, a transformer, a voltage stabilizing circuit module, a protection circuit module, an output circuit switch module and an output module are arranged in the shell, the input module, the input circuit switch module, the IGBT module, the regulation and control module, the display module, the transformer, the voltage stabilizing circuit module, the protection circuit module, the output circuit switch module and the output module are connected in sequence, the IGBT module consists of bipolar triodes and MOS effect transistors, supporting legs are welded and installed at the bottom of the shell, the number of the supporting legs is four and are arranged in a rectangular array, rubber insulating pads are arranged at the bottoms of the supporting legs, a first mounting plate is welded and installed on the front side wall of the shell, a display is arranged on the first mounting plate, a display switch is arranged on one side wall, a voltage adjusting knob, a current adjusting knob and a frequency adjusting knob are rotatably arranged on the front side wall of the shell under the first mounting plate, corresponding adjusting scales are arranged at the joints of the voltage adjusting knob, the current adjusting knob and the frequency adjusting knob and the shell, the wiring terminals of the voltage adjusting knob, the current adjusting knob and the frequency adjusting knob are electrically connected with the regulating module, a host switch is arranged on one side of the front side wall of the shell at the voltage adjusting knob, the current adjusting knob and the frequency adjusting knob, a second mounting plate is welded and arranged on one side of the front side wall of the shell at the first mounting plate, output interfaces are arranged on the second mounting plate, the number of the output interfaces is two, the wiring terminals of the output interfaces are electrically connected with the output module, and an output power switch is arranged on one side of the front side wall of the shell at the second mounting plate, output power switch is connected the setting with the output module electricity, the back lateral wall of casing is provided with the heat dissipation fan, the outer wall welding that the back lateral wall of casing is located the heat dissipation fan installs the heat dissipation fan protection network, the back lateral wall welding of casing installs the third mounting panel, be provided with input interface on the third mounting panel, input interface's quantity is a set of, input interface's wiring end and input module electricity are connected the setting, one side that the back lateral wall of casing is located the third mounting panel is provided with input power switch, input power switch's wiring end and input module electricity are connected the setting, the dead lever is installed in the top welding of casing, the quantity of dead lever is four groups and is the installation of rectangular array arrangement, the horizontal pole is installed.
Preferably, the inside of the display is divided into three groups for independent display, and the three groups of independent display modules are used for voltage display, current display and frequency display in sequence.
Preferably, the terminals of the display and the display switch are electrically connected with the display module.
Preferably, the voltage adjusting knob, the current adjusting knob and the frequency adjusting knob correspond to three groups of single display modules of the display in sequence.
Preferably, the radiating holes are formed in two side walls of the shell, the dust guard is welded to the top of the outer side of the radiating holes, and the dust guard is arranged in an inclined mode.
Preferably, the cross rod is sleeved with an insulating sleeve, and the insulating sleeve is mainly made of rubber.
Compared with the prior art, the invention has the beneficial effects that: this alternating current voltage regulation power supply, through setting gradually input switch and output switch at the output kneck and the output kneck of device, thereby make the device when not using, can be through input switch and output switch with the power in its device temporarily disconnection, make the device can not be in operating condition for a long time to a certain extent, thereby the practicality life-span of device has been improved greatly, voltage stabilizing circuit module and protection circuit module have been added in the device simultaneously, transformer and IGBT module have been avoided when the switch to a certain extent, high frequency interference is too big, lead to driven out of control, cause the problem of alternating current voltage regulation power supply damage.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic side view of the present invention;
FIG. 3 is a rear view of the present invention;
FIG. 4 is a block diagram of a process according to the present invention.
In the figure: the device comprises a first mounting plate 1, a shell 2, a host switch 3, a voltage adjusting knob 4, a current adjusting knob 5, a frequency adjusting knob 6, an output power switch 7, an output interface 8, a second mounting plate 9, a display switch 10, a display 11, a heat dissipation fan protective screen 12, an input power switch 13, a third mounting plate 14, an input interface 15, supporting legs 16, heat dissipation holes 17, fixing rods 18, a cross rod 19 and an insulating sleeve 20.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: referring to fig. 1-4, the ac voltage-regulating power supply comprises a casing 2, an input module, an input circuit switch module, an IGBT module, a regulation module, a display module, a transformer, a voltage stabilizing circuit module, a protection circuit module, an output circuit switch module and an output module are arranged in the casing 2, the input module, the input circuit switch module, the IGBT module, the regulation module, the display module, the transformer, the voltage stabilizing circuit module, the protection circuit module, the output circuit switch module and the output module are all connected in this order, the IGBT module is composed of a bipolar triode and a MOS effect transistor, support legs 16 are welded and installed at the bottom of the casing 2, the number of the support legs 16 is four groups and are arranged in a rectangular array, rubber insulating pads are arranged at the bottoms of the support legs 16, a first mounting plate 1 is welded and installed at the front side wall of the casing 2, and, the inside of the display 11 is divided into three groups for independent display, the three groups of independent display modules are sequentially voltage display, current display and frequency display, a display switch 10 is arranged on one side wall of the display 11 on the first mounting plate 1, the terminals of the display 11 and the display switch 10 are electrically connected with the display modules, a voltage adjusting knob 4, a current adjusting knob 5 and a frequency adjusting knob 6 are rotatably arranged on the front side wall of the shell 2 under the first mounting plate 1, the voltage adjusting knob 4, the current adjusting knob 5 and the frequency adjusting knob 6 sequentially correspond to the three groups of independent display modules of the display 11, corresponding adjusting scales are arranged at the joints of the voltage adjusting knob 4, the current adjusting knob 5 and the frequency adjusting knob 6 and the shell 2 on the front side wall of the shell 2, the terminals of the voltage adjusting knob 4, the current adjusting knob 5 and the frequency adjusting knob 6 are electrically connected with the adjusting modules, a host switch 3 is arranged on one side of the front side wall of the shell 2, which is positioned on the voltage adjusting knob 4, the current adjusting knob 5 and the frequency adjusting knob 6, a second mounting plate 9 is welded and mounted on one side of the front side wall of the shell 2, an output interface 8 is arranged on the second mounting plate 9, the number of the output interfaces 8 is two, the wiring ends of the output interfaces 8 are electrically connected with an output module, heat dissipation holes 17 are respectively arranged on both side walls of the shell 2, a dust guard is welded and mounted on the top of the outer side of each heat dissipation hole 17, the dust guard is obliquely arranged, a heat dissipation fan is arranged on the rear side wall of the shell 2, a heat dissipation fan protective screen 12 is welded and mounted on the outer wall of the heat dissipation fan on the rear side wall of the shell 2, a third mounting plate 14 is welded and mounted on the rear side wall of the shell 2, an input interface 15 is arranged on, the top welding of casing 2 installs dead lever 18, and the quantity of dead lever 18 is four groups and is the installation of rectangular array arrangement, and the adjacent two sets of top welding of dead lever 18 installs horizontal pole 19, and the cover is equipped with insulating cover 20 on the horizontal pole 19, and the main material of insulating cover 20 is rubber.
Example two: referring to fig. 1-4, the ac voltage-regulating power supply comprises a casing 2, an input module, an input circuit switch module, an IGBT module, a regulation module, a display module, a transformer, a voltage stabilizing circuit module, a protection circuit module, an output circuit switch module and an output module are arranged in the casing 2, the input module, the input circuit switch module, the IGBT module, the regulation module, the display module, the transformer, the voltage stabilizing circuit module, the protection circuit module, the output circuit switch module and the output module are all connected in this order, the IGBT module is composed of a bipolar triode and a MOS effect transistor, support legs 16 are welded and installed at the bottom of the casing 2, the number of the support legs 16 is four groups and are arranged in a rectangular array, rubber insulating pads are arranged at the bottoms of the support legs 16, a first mounting plate 1 is welded and installed at the front side wall of the casing 2, and, the inside of the display 11 is divided into three groups for independent display, the three groups of independent display modules are sequentially voltage display, current display and frequency display, a display switch 10 is arranged on one side wall of the display 11 on the first mounting plate 1, the terminals of the display 11 and the display switch 10 are electrically connected with the display modules, a voltage adjusting knob 4, a current adjusting knob 5 and a frequency adjusting knob 6 are rotatably arranged on the front side wall of the shell 2 under the first mounting plate 1, the voltage adjusting knob 4, the current adjusting knob 5 and the frequency adjusting knob 6 sequentially correspond to the three groups of independent display modules of the display 11, corresponding adjusting scales are arranged at the joints of the voltage adjusting knob 4, the current adjusting knob 5 and the frequency adjusting knob 6 and the shell 2 on the front side wall of the shell 2, the terminals of the voltage adjusting knob 4, the current adjusting knob 5 and the frequency adjusting knob 6 are electrically connected with the adjusting modules, a host switch 3 is arranged on one side of the front side wall of the shell 2, which is positioned on the voltage adjusting knob 4, the current adjusting knob 5 and the frequency adjusting knob 6, a second mounting plate 9 is welded and installed on one side of the front side wall of the shell 2, which is positioned on one side of the first mounting plate 1, an output interface 8 is arranged on the second mounting plate 9, the number of the output interfaces 8 is two, the wiring ends of the output interfaces 8 are electrically connected with the output module, an output power switch 7 is arranged on one side of the front side wall of the shell 2, which is positioned on one side of the second mounting plate 9, the output power switch 7 is electrically connected with the output module, heat dissipation holes 17 are respectively arranged on two side walls of the shell 2, dust shields are welded and installed on the top of the outer sides of the heat dissipation holes 17, the dust shields are arranged in an inclined manner, a heat dissipation fan is arranged on the rear side wall of, be provided with input interface 15 on the third mounting panel 14, input interface 15's quantity is a set of, input interface 15's wiring end and input module electricity are connected and are set up, one side that the rear side wall of casing 2 is located third mounting panel 14 is provided with input switch 13, input switch 13's wiring end and input module electricity are connected and are set up, casing 2's top welded mounting has dead lever 18, dead lever 18's quantity is four groups and is the installation of rectangular array arrangement, horizontal pole 19 is installed in the adjacent two sets of top welded mounting of dead lever 18, the cover is equipped with insulating cover 20 on the horizontal pole 19, the main material of insulating cover 20 is rubber.
The working principle is as follows: when the device starts to be used, an external alternating current power supply is in butt joint with the input interface 15, an electric appliance needing voltage regulation is in butt joint with the output interface 8, the host switch 3 is turned on, the driving device operates, the input power switch 13 is turned on, the external alternating current enters the device and is rectified and inverted by the IGBT module, the required power supply voltage is regulated by the voltage regulating knob 4, the current regulating knob 5 and the frequency regulating knob 6, meanwhile, the external alternating current enters the transformer and is subjected to voltage stabilization and protection by the voltage stabilizing circuit module and the protection circuit module, the output power switch 7 is turned on, and voltage regulation of the device is completed.
In summary, the following steps: this alternating current voltage regulation power, through input interface 15 department and output interface 8 department at the device set gradually input switch 13 and output switch 7, thereby make the device when not using, can be through input switch 13 and output switch 7 with the power in its device temporarily disconnection, make the device can not be in operating condition for a long time to a certain extent, thereby the practicality life-span of device has been improved greatly, voltage stabilizing circuit module and protection circuit module have been added in the device simultaneously, transformer and IGBT module have been avoided when the switch to a certain extent, high frequency interference is too big, lead to driven out of control, cause the occurence of failure of alternating current voltage regulation power damage.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An alternating current voltage-regulating power supply comprises a shell (2) and is characterized in that an input module, an input circuit switch module, an IGBT module, a regulation and control module, a display module, a transformer, a voltage stabilizing circuit module, a protection circuit module, an output circuit switch module and an output module are arranged in the shell (2), the input module, the input circuit switch module, the IGBT module, the regulation and control module, the display module, the transformer, the voltage stabilizing circuit module, the protection circuit module, the output circuit switch module and the output module are connected in sequence, the IGBT module comprises a bipolar triode and a MOS effect transistor, supporting legs (16) are welded and installed at the bottom of the shell (2), the number of the supporting legs (16) is four groups and are arranged in a rectangular array, rubber insulating pads are arranged at the bottoms of the supporting legs (16), a first mounting plate (1) is welded and installed on the front side wall of the, a display (11) is arranged on the first mounting plate (1), a display switch (10) is arranged on one side wall of the first mounting plate (1) which is positioned on the display (11), a voltage adjusting knob (4), a current adjusting knob (5) and a frequency adjusting knob (6) are rotatably arranged on the front side wall of the shell (2) which is positioned under the first mounting plate (1), corresponding adjusting scales are arranged at the joints of the voltage adjusting knob (4), the current adjusting knob (5) and the frequency adjusting knob (6) and the shell (2), terminals of the voltage adjusting knob (4), the current adjusting knob (5) and the frequency adjusting knob (6) are electrically connected with the adjusting and controlling module, a host switch (3) is arranged on one side of the front side wall of the shell (2) which is positioned on the voltage adjusting knob (4), the current adjusting knob (5) and the frequency adjusting knob (6), a second mounting plate (9) is welded and mounted on one side, located on the first mounting plate (1), of the front side wall of the shell (2), output interfaces (8) are arranged on the second mounting plate (9), the number of the output interfaces (8) is two, wiring terminals of the output interfaces (8) are electrically connected with the output module, an output power switch (7) is arranged on one side, located on the second mounting plate (9), of the front side wall of the shell (2), the output power switch (7) is electrically connected with the output module, a heat dissipation fan is arranged on the rear side wall of the shell (2), a heat dissipation fan protective screen (12) is welded and mounted on the outer wall, located on the heat dissipation fan, of the rear side wall of the shell (2), a third mounting plate (14) is welded and mounted on the rear side wall of the shell (2), input interfaces (15) are arranged on the third mounting plate (14), the number of the input interfaces (15) is one, and, one side that the rear side wall of casing (2) is located third mounting panel (14) is provided with input switch (13), and input switch (13)'s wiring end and input module electricity are connected and are set up, and dead lever (18) are installed in the top welding of casing (2), and the quantity of dead lever (18) is four groups and is the installation of rectangle array arrangement, and horizontal pole (19) are installed in the top welding of adjacent two sets of dead lever (18).
2. An AC voltage-regulating power supply according to claim 1, characterized in that the display (11) is internally divided into three groups of individual display modules, which are sequentially voltage display, current display and frequency display.
3. An AC voltage-regulated power supply according to claim 1, wherein the terminals of the display (11) and the display switch (10) are both electrically connected to the display module.
4. An alternating current voltage-regulated power supply according to claim 1, characterized in that the voltage adjusting knob (4), the current adjusting knob (5) and the frequency adjusting knob (6) correspond in sequence to three groups of individual display modules of the display (11).
5. An AC voltage-regulating power supply according to claim 1, wherein both side walls of the casing (2) are provided with heat dissipation holes (17), and the top of the outer side of each heat dissipation hole (17) is welded with a dust guard which is arranged in an inclined manner.
6. An AC voltage-regulating power supply according to claim 1, characterized in that the cross bar (19) is sleeved with an insulating sleeve (20), and the insulating sleeve (20) is mainly made of rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011359158.XA CN112583281A (en) | 2020-11-27 | 2020-11-27 | AC voltage-regulating power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011359158.XA CN112583281A (en) | 2020-11-27 | 2020-11-27 | AC voltage-regulating power supply |
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| Publication Number | Publication Date |
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| CN112583281A true CN112583281A (en) | 2021-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011359158.XA Pending CN112583281A (en) | 2020-11-27 | 2020-11-27 | AC voltage-regulating power supply |
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| CN (1) | CN112583281A (en) |
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| CN210404401U (en) * | 2019-09-17 | 2020-04-24 | 广州华智能源技术有限公司 | Power frequency module UPS integrated power supply |
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| CN104065278A (en) * | 2013-03-22 | 2014-09-24 | 佛山市顺德区尚研电子科技有限公司 | Variable frequency power supply |
| CN104578809A (en) * | 2013-10-16 | 2015-04-29 | 鸿富锦精密电子(天津)有限公司 | Power output device and power socket |
| CN203734555U (en) * | 2014-03-14 | 2014-07-23 | 艾默生网络能源有限公司 | Output panel for communication power supply and communication power supply |
| CN204649860U (en) * | 2015-05-05 | 2015-09-16 | 云南电网有限责任公司电力科学研究院 | A kind of multifunctional high pressure fuse device for detecting performance |
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| CN108199587A (en) * | 2017-12-30 | 2018-06-22 | 中国船舶重工集团公司第七〇二研究所 | A kind of electric railway AC frequency conversion supply unit |
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| CN209344843U (en) * | 2019-03-06 | 2019-09-03 | 中国有色桂林矿产地质研究院有限公司 | A kind of portable middle low power direct current mobile power source of exploration |
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Application publication date: 20210330 |