CN111614272A - Centralized power supply type load driving method and system - Google Patents
Centralized power supply type load driving method and system Download PDFInfo
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- CN111614272A CN111614272A CN202010560702.0A CN202010560702A CN111614272A CN 111614272 A CN111614272 A CN 111614272A CN 202010560702 A CN202010560702 A CN 202010560702A CN 111614272 A CN111614272 A CN 111614272A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
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Abstract
The invention discloses a centralized power supply type load driving method and system, wherein the load driving system comprises a power adapter, a load unit and a PWM unit; the power adapter comprises an AC input interface, a conversion control board and a DC output interface; the load unit is connected with a DC output interface of the power adapter through a power connecting line; the PWM unit comprises a first PWM module and a second PWM module, the first PWM module is connected in parallel with one end of the power connecting line connected with the power adapter, and the second PWM module is connected in parallel with the other end of the power connecting line connected with the load unit; the first PWM module is connected with the power adapter, and the second PWM module is connected with the first PWM module. Through the interaction of the first PWM module and the second PWM module, the power required by the current load unit connected to the power grid during working can be accurately calculated, and then the power adapter is controlled to output the total current with the corresponding magnitude, so that the overall power of the power grid is flexibly controlled.
Description
Technical Field
The invention relates to the field of power supply systems, in particular to a centralized power supply type load driving method and system.
Background
With the continuous development of the LED plant lighting technology, the requirements of various lighting modes on the driving power supply are higher and higher. In practical application, the lighting system is often required to have higher lighting efficiency, larger and more uniform illumination area, lower failure rate, lower cost and more intelligent lighting mode. To meet the above requirements, centralized power supply is currently a widely regarded effective means.
The centralized power supply system is to drive a plurality of different load units (such as LED lamps) by the same power supply. In a centralized power supply system, a common implementation manner is to adopt an AC-DC constant voltage module as a primary drive at the front end, output a constant voltage, and adopt n DC-DC constant current modules as a secondary drive at the rear end to supply power for the operating characteristics of the LED lamp. The existence of the two-stage circuit severely limits the working efficiency of the whole system, and when dimming is involved, the two-stage circuit can only be operated on the back-end DC-DC module one by one, thereby increasing the complexity of the circuit and the instability of signals.
Disclosure of Invention
Therefore, a technical scheme of a centralized power supply type load drive is needed to be provided for solving the problems of low working efficiency, complex circuit and the like of the existing centralized power supply mode.
In order to achieve the above object, the present invention provides a concentrated power supply type load driving system, which includes a power adapter, a load unit, and a PWM unit;
the power adapter comprises an AC input interface, a conversion control board and a DC output interface; the AC input interface is connected with the DC output interface through the conversion control board, and the conversion control board is used for converting AC voltage into DC voltage;
the load unit is connected with a DC output interface of the power adapter through a power connecting line;
the PWM unit comprises a first PWM module and a second PWM module, the first PWM module is connected in parallel with one end of the power connecting line connected with the power adapter, and the second PWM module is connected in parallel with the other end of the power connecting line connected with the load unit;
the first PWM module is connected with the power adapter, and the second PWM module is connected with the first PWM module.
As an optional embodiment, the number of the load units is multiple, and each load unit corresponds to one second PWM module; different load units are connected in parallel, and the second PWM module is connected in parallel to a power supply connecting line between the corresponding load unit and the power adapter.
As an optional embodiment, the first PWM module includes a first isolation transformation acquisition circuit and a first MCU module, and the first isolation transformation acquisition circuit includes a first isolation circuit, a first transformation circuit and a first rectification circuit;
the first isolation circuit is used for isolating the direct current signal from the power supply connecting line and enabling the alternating current signal to pass;
the first transformation signal is used for reducing the alternating current signal passed by the isolation circuit, and the first rectification circuit is used for rectifying the reduced alternating current signal and transmitting the rectified signal to the first MCU module.
As an optional embodiment, the second PWM module includes a second isolation transformation acquisition circuit and a second MCU module, and the second isolation transformation acquisition circuit includes a second isolation circuit and a second transformation circuit;
the first isolation circuit is used for isolating the direct current signal from the power supply connecting line and enabling the alternating current signal to pass;
the first voltage transformation signal is used for amplifying the alternating current signal passing through the isolation circuit and transmitting the amplified signal to the second MCU module.
As an alternative embodiment, the load unit is an LED lamp.
As an optional embodiment, the LED lamp includes a lamp body and a light emitting diode, the light emitting diode is disposed in the lamp body, and a control switch for controlling the light emitting diode to be turned on or off is further disposed on the lamp body.
The inventor also provides a centralized power supply type load driving method, which is applied to the centralized power supply type load driving system as described in the foregoing, and the method comprises the following steps:
the first PWM module receives the electric signals fed back by the second PWM modules, counts the number of the currently accessed load units according to the electric signals fed back by the second PWM modules, and calculates the total power required by all the load units during working according to the number of the currently accessed load units;
the first PWM module sends a starting control signal to the power adapter, so that the power adapter outputs total current with corresponding size according to the total power size required by all the load units in working states.
As an alternative embodiment, the method comprises:
when the power adapter outputs the total current with corresponding magnitude according to the total power magnitude required by all the load units in working states, the first PWM module is no longer coupled with the signal on the power connecting line.
Different from the prior art, the load driving method and system of the centralized power supply type related to the scheme comprise a power adapter, a load unit and a PWM unit; the power adapter comprises an AC input interface, a conversion control board and a DC output interface; the load unit is connected with a DC output interface of the power adapter through a power connecting line; the PWM unit comprises a first PWM module and a second PWM module, the first PWM module is connected in parallel with one end of the power connecting line connected with the power adapter, and the second PWM module is connected in parallel with the other end of the power connecting line connected with the load unit; the first PWM module is connected with the power adapter, and the second PWM module is connected with the first PWM module. Through the interaction of the first PWM module and the second PWM module, the power required by the current load unit connected to the power grid during working can be accurately calculated, and then the power adapter is controlled to output the total current with the corresponding magnitude, so that the overall power of the power grid is flexibly controlled.
Drawings
Fig. 1 is a schematic circuit diagram of a centralized power supply type load driving system according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a first PWM module according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a second PWM module according to an embodiment of the present invention;
fig. 4 is a flowchart of a centralized power supply type load driving system according to an embodiment of the present invention.
Reference numerals:
10. a power adapter;
11. a load unit;
12. a first PWM module; 121. a first demodulation circuit chip; 122. a first modulation circuit chip;
13. a second PWM module; 131. a first demodulation circuit chip; 132. and a second modulation circuit chip.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Fig. 1 is a schematic circuit diagram of a centralized power supply type load driving system according to an embodiment of the present invention. The load driving system comprises a power adapter 10, a load unit 11 and a PWM unit;
the power adapter 10 comprises an AC input interface, a conversion control board and a DC output interface; the AC input interface is connected with the DC output interface through the conversion control board, and the conversion control board is used for converting AC voltage into DC voltage;
the load unit 11 is connected with a DC output interface of the power adapter 10 through a power connecting line;
the PWM unit comprises a first PWM module 12 and a second PWM module 13, the first PWM module 12 is connected in parallel with one end of the power connecting line connected with the power adapter 10, and the second PWM module 13 is connected in parallel with the other end of the power connecting line connected with the load unit 11;
the first PWM module 12 is connected to the power adapter 10, and the second PWM module 13 is connected to the first PWM module 12.
In the practical application process, the AC input end of the power adapter 10 is connected to the zero line and the live line, the alternating current is converted into direct current through the power adapter 10, and the direct current is connected to the load unit 11 through the positive power line and the negative power line, so as to supply power to the load unit 11. The first PWM module 12 is connected to one end of the positive power line and one end of the negative power line in parallel, the second PWM module 13 is connected to the other end of the positive power line and the other end of the negative power line in parallel, the first PWM module 12 is arranged close to the power adapter 10, and the second PWM module 13 is arranged close to the load unit 11.
After the power grid is connected, the first PWM module 12 counts the number of load units 11 connected to the power grid according to the feedback signal and the number of the load units 11 connected to the power grid is obtained, and after the total power required by the current power grid is obtained (the total power is equal to the sum of the powers required by the work of the load units 11), the first PWM module 12 provides a start signal to the power adapter 10 (i.e., an AC-DC module) to control the power adapter 10 to output the total current required by the rear-end load units 11, thereby flexibly controlling the overall power. Meanwhile, the first PWM module 12 is not operated after the power adapter 10 (i.e., the AC-DC module) is started. The system is safe and efficient, the number of the load units 11 required by the rear end can be flexibly adjusted according to the actual application condition under the condition that no additional line is added, and the requirements of different application scenes are met.
In some embodiments, the number of the load units 11 is multiple, and each load unit 11 corresponds to one second PWM module 13; the different load units 11 are connected in parallel, and the second PWM module 13 is connected in parallel to the power connection line between the corresponding load unit 11 and the power adapter 10. In short, each load unit 11 has a corresponding second PWM module 13, which is used to monitor the power required by the working state of the load unit 11, and when the power is obtained, the second PWM module 13 sends a signal containing the power to the first PWM module 12.
After receiving the power sent by each second PWM module 13, the first PWM module 12 sums up the total power required by the operation of each connected load unit 11 in the current power grid, and sends a control signal to the power adapter 10, so that the power adapter 10 outputs the total current corresponding to the total power. When the number of the load units 11 is adjusted, the total power counted by the first PWM module 12 is also adjusted, and the total current outputted by the power adapter 10 controlled by the total power counted by the first PWM module is also adaptively adjusted. Therefore, under the condition of not increasing additional lines, the number of the load units 11 required by the rear end can be flexibly adjusted in practical application, and the overall power of the power grid can be flexibly controlled.
In some embodiments, the load unit 11 is an LED lamp. The LED lamp comprises a lamp body and a light emitting diode, wherein the light emitting diode is arranged in the lamp body, and the lamp body is also provided with a control switch for controlling the light emitting diode to be turned on or off. The load units 11 can be quickly turned on or off by controlling the switches, so that the number of the whole load units 11 connected to the power grid is controlled, and the requirements of different application scenes are met. Of course, in other embodiments, the load unit 11 may also be other light emitting elements.
In certain embodiments, the first PWM module 12 comprises a first isolation transformer acquisition circuit comprising a first isolation circuit, a first transformer circuit, and a first rectifier circuit, and a first MCU module; the first isolation circuit is used for isolating the direct current signal from the power supply connecting line and enabling the alternating current signal to pass; the first transformation signal is used for reducing the alternating current signal passed by the isolation circuit, and the first rectification circuit is used for rectifying the reduced alternating current signal and transmitting the rectified signal to the first MCU module.
Fig. 2 is a circuit diagram of the first PWM module 12 according to an embodiment of the present invention. The first MCU module includes a first demodulation circuit chip 121 and a first modulation circuit chip 122. The first demodulation circuit chip 121 may be implemented by a chip of model LM567, and the first modulation circuit chip 122 may be implemented by a chip of model NE 555.
The purpose of modulation is to convert an analog or digital signal to be transmitted into a signal suitable for channel transmission, which means to convert a baseband signal (source) into a band-pass signal of very high frequency relative to the baseband frequency, called modulated signal, and the baseband signal called modulated signal. Modulation may be achieved by varying the amplitude, phase or frequency of the high frequency carrier as the signal amplitude varies. The modulation process is used at the transmitting end of the communication system. At the receiving end, the modulated signal is restored to the original signal to be transmitted, i.e., the baseband signal is extracted from the carrier wave for processing and understanding by the intended recipient (sink), which is called demodulation.
Capacitors C4, C5, and C6 (i.e., "first isolation circuit") in the circuit shown in fig. 2 are used to isolate the dc signal and let the ac signal pass, and an isolation transformer T2 (i.e., "first transformer circuit") is used to further isolate the signal of the MCU module from the current of the load unit 11 to avoid interference, and at the same time, to reduce the signal, and then the electrical signal is limited by a resistor R5 connected in series, and is limited by bridge rectifiers D1 to D4 (i.e., "first rectifier circuit") connected in parallel, thereby ensuring the stability of the electrical signal entering the MCU module.
The first PWM module 12 sends a signal through an LED +/-connection line (i.e., a positive and negative connection line of a power supply), receives a feedback signal from the second PWM module 13, counts the current power required by all the load units 11 according to the feedback signal of all the second PWM modules 13, outputs an accurate PWM signal to the AC-DC module according to the current power required by all the load units 11, and further adjusts the maximum current output by the AC-DC module, thereby flexibly controlling the overall power. When the AC-DC module is completely started, the MCU module no longer couples signals to the LED +/-wires (i.e., the positive and negative connection wires of the power supply), thereby avoiding interference with the normal use of the load unit 11.
In some embodiments, the second PWM module 13 includes a second isolation transformation acquisition circuit and a second MCU module, the second isolation transformation acquisition circuit includes a second isolation circuit and a second transformation circuit;
the first isolation circuit is used for isolating the direct current signal from the power supply connecting line and enabling the alternating current signal to pass; the first voltage transformation signal is used for amplifying the alternating current signal passing through the isolation circuit and transmitting the amplified signal to the second MCU module.
Fig. 3 is a circuit diagram of the second PWM module 13 according to an embodiment of the present invention. The second MCU module includes a second demodulation circuit chip 131 and a second modulation circuit chip 132. The second demodulation circuit chip 131 may be implemented by a chip of model LM567, and the second modulation circuit chip 132 may be implemented by a chip of model NE 555.
In the second isolation transformation acquisition circuit, the capacitors C1, C2 and C3 (i.e., "second isolation circuit") are used for communicating alternating current signals to the LED +/-connection line (i.e., the positive and negative connection lines of the power supply), and meanwhile, the direct current components in the circuit are prevented from influencing the second MCU module and the LED +/-line, the isolation transformer T1 (i.e., "second transformation circuit") is used for amplifying the alternating current signals, and meanwhile, the signals of the MCU and the current of the LED lamp (i.e., the load unit 11) are isolated to avoid interference, so that the purity of the MCU electrical signals is ensured and the safety requirements are met. The second MCU module is composed of NE555, LM567 chips and peripheral circuits thereof, and forms a modulation circuit and a demodulation circuit. When the second PWM module 13 collects the signal from the LED +/-the signal is demodulated and a default signal containing the power requirement is sent through the modulation circuit and fed back to the first MCU module through the LED +/-line. And after receiving the feedback signals of the second PWM modules 13, the first MCU module counts the overall power required by the load unit 11 accessed to the power grid.
As shown in fig. 4, the inventor further provides a centralized power supply type load driving method, which is applied to the system of centralized power supply type load driving as described above, and the method comprises the following steps:
firstly, step S401 is entered, wherein a first PWM module receives electric signals fed back by each second PWM module, counts the number of load units accessed currently according to the electric signals fed back by each second PWM module, and calculates the total power required by all the load units during working according to the number of the load units accessed currently;
then, step S402 is executed to enable the first PWM module to send a start control signal to the power adapter, so that the power adapter outputs a total current with a corresponding magnitude according to the total power magnitude required by the working states of all the load units.
Preferably, in order to avoid interfering with the normal operation of the load unit 11, the method comprises: when the power adapter 10 outputs a total current of a corresponding magnitude according to the total power magnitude required by all the load units 11 in the operating state, the first PWM module 12 stops operating. The stopping of the first PWM module 12 specifically includes: the first MCU module does not perform decoupling signals on the positive and negative connecting wires of the power supply any more.
The invention discloses a centralized power supply type load driving method and system, wherein the load driving system comprises a power adapter, a load unit and a PWM unit; the power adapter comprises an AC input interface, a conversion control board and a DC output interface; the load unit is connected with a DC output interface of the power adapter through a power connecting line; the PWM unit comprises a first PWM module and a second PWM module, the first PWM module is connected in parallel with one end of the power connecting line connected with the power adapter, and the second PWM module is connected in parallel with the other end of the power connecting line connected with the load unit; the first PWM module is connected with the power adapter, and the second PWM module is connected with the first PWM module. Through the interaction of the first PWM module and the second PWM module, the power required by the current load unit connected to the power grid during working can be accurately calculated, and then the power adapter is controlled to output the total current with the corresponding magnitude, so that the overall power of the power grid is flexibly controlled.
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 terminal 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 terminal. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.
Although the embodiments have been described, once the basic inventive concept is obtained, other variations and modifications of these embodiments can be made by those skilled in the art, so that the above embodiments are only examples of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes using the contents of the present specification and drawings, or any other related technical fields, which are directly or indirectly applied thereto, are included in the scope of the present invention.
Claims (8)
1. The centralized power supply type load driving system is characterized by comprising a power adapter, a load unit and a PWM unit;
the power adapter comprises an AC input interface, a conversion control board and a DC output interface; the AC input interface is connected with the DC output interface through the conversion control board, and the conversion control board is used for converting AC voltage into DC voltage;
the load unit is connected with a DC output interface of the power adapter through a power connecting line;
the PWM unit comprises a first PWM module and a second PWM module, the first PWM module is connected in parallel with one end of the power connecting line connected with the power adapter, and the second PWM module is connected in parallel with the other end of the power connecting line connected with the load unit;
the first PWM module is connected with the power adapter, and the second PWM module is connected with the first PWM module.
2. The concentrated power supply type load driving system according to claim 1, wherein the number of the load units is plural, and each load unit corresponds to one second PWM module; different load units are connected in parallel, and the second PWM module is connected in parallel to a power supply connecting line between the corresponding load unit and the power adapter.
3. The centrally-powered load driving system according to claim 1, wherein the first PWM module comprises a first isolation transformer acquisition circuit and a first MCU module, the first isolation transformer acquisition circuit comprising a first isolation circuit, a first transformer circuit and a first rectifier circuit;
the first isolation circuit is used for isolating the direct current signal from the power supply connecting line and enabling the alternating current signal to pass;
the first transformation signal is used for reducing the alternating current signal passed by the isolation circuit, and the first rectification circuit is used for rectifying the reduced alternating current signal and transmitting the rectified signal to the first MCU module.
4. The concentrated powered load driving system of claim 1, wherein the second PWM module comprises a second isolation transformer acquisition circuit and a second MCU module, the second isolation transformer acquisition circuit comprising a second isolation circuit and a second transformer circuit;
the first isolation circuit is used for isolating the direct current signal from the power supply connecting line and enabling the alternating current signal to pass;
the first voltage transformation signal is used for amplifying the alternating current signal passing through the isolation circuit and transmitting the amplified signal to the second MCU module.
5. The centrally powered load driving system of claim 1, wherein the load unit is an LED light fixture.
6. The system according to claim 5, wherein the LED lamp comprises a lamp body and a light emitting diode, the light emitting diode is disposed in the lamp body, and a control switch for controlling the light emitting diode to be turned on or off is further disposed on the lamp body.
7. A method for driving a concentrated power supply type load, which is applied to the system for driving a concentrated power supply type load according to any one of claims 1 to 6, the method comprising the steps of:
the first PWM module receives the electric signals fed back by the second PWM modules, counts the number of the currently accessed load units according to the electric signals fed back by the second PWM modules, and calculates the total power required by all the load units during working according to the number of the currently accessed load units;
the first PWM module sends a starting control signal to the power adapter, so that the power adapter outputs total current with corresponding size according to the total power size required by all the load units in working states.
8. The method for driving a concentrated power supply type load according to claim 7, wherein the method comprises:
when the power adapter outputs the total current with corresponding magnitude according to the total power magnitude required by all the load units in working states, the first PWM module is no longer coupled with the signal on the power connecting line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010560702.0A CN111614272A (en) | 2020-06-18 | 2020-06-18 | Centralized power supply type load driving method and system |
| PCT/CN2021/082926 WO2021253908A1 (en) | 2020-06-18 | 2021-03-25 | Centralized power supply-based load drive method, and system |
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| CN202010560702.0A CN111614272A (en) | 2020-06-18 | 2020-06-18 | Centralized power supply type load driving method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021253908A1 (en) * | 2020-06-18 | 2021-12-23 | 福建省中科生物股份有限公司 | Centralized power supply-based load drive method, and system |
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| WO2021253908A1 (en) | 2021-12-23 |
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