CN111181233A - Digital charging device - Google Patents
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- CN111181233A CN111181233A CN201811339620.2A CN201811339620A CN111181233A CN 111181233 A CN111181233 A CN 111181233A CN 201811339620 A CN201811339620 A CN 201811339620A CN 111181233 A CN111181233 A CN 111181233A
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Abstract
The invention discloses a digital charging device. The device includes: the main power circuit module converts the received power frequency direct current voltage into charging voltage and outputs the charging voltage to the battery load of the electric automobile; the first sampling module is used for collecting the charging voltage and the output current of the main power circuit module and outputting the collected first sampling voltage and the collected first sampling current; and when the first sampling voltage is less than or equal to a first preset voltage value or the first sampling current is less than or equal to a first preset current value, the digital control circuit module regulates the PWM output signal by utilizing a PID (proportion integration differentiation) regulation subprogram and amplifies the PWM output signal to obtain a DSP (digital signal processor) driving signal. The service life of the battery can not be influenced in the process of charging the battery.
Description
Technical Field
The invention relates to the technical field of power battery charging, in particular to a digital charging device.
Background
The electric automobile is a vehicle which takes a vehicle-mounted power supply as power and drives wheels to run by a motor, and meets various requirements of road traffic and safety regulations. Because the influence on the environment is smaller than that of the traditional automobile, the automobile occupies a leading position in the new energy market in China. With the rapid development of electric vehicles, the requirements for charging devices for electric vehicles are also increasing.
At present, a plurality of electric automobiles at home and abroad are provided with vehicle-mounted chargers, and the vehicle-mounted chargers mainly adopt an analog control method to charge batteries. However, during the charging process, the battery is seriously damaged due to a single constant voltage or constant current charging mode, so that the service life of the battery is influenced.
Therefore, there is a technical problem that the charging device affects the service life of the battery during the process of charging the battery.
Disclosure of Invention
The embodiment of the invention provides a digital charging device which can not influence the service life of a battery in the charging process of the battery
In one aspect of the embodiments of the present invention, a digital charging apparatus is provided, which includes: the main power circuit module is configured to convert the received power frequency direct current voltage into a charging voltage and output the charging voltage to an electric vehicle battery load;
the first sampling module is configured to collect charging voltage and collect output current of the main power circuit module, obtain first sampling voltage and first sampling current, and output the first sampling voltage and the first sampling current;
and the digital control circuit module is configured to output a PWM output signal according to the received first sampling voltage and the received first sampling current, when the first sampling voltage is less than or equal to a first preset voltage value or the first sampling current is less than or equal to a first preset current value, the digital control circuit module adjusts the PWM driving waveform by using a PID (proportion integration differentiation) adjusting subprogram and performs signal amplification processing on the PWM driving waveform to obtain the PWM output signal, and the PWM output signal of the digital control circuit module is used for controlling the main power circuit module to output the charging voltage.
According to the digital charging device provided by the embodiment of the invention, the feedback loop is formed by the main power circuit module, the first sampling circuit and the digital control circuit module, so that the digital control circuit module can adjust the PWM output signal according to the first sampling voltage and the first sampling current acquired by the first sampling module, and further control the main power circuit module to output the charging voltage through the PWM output signal. The charging voltage output by the main power circuit can be adjusted in real time according to the PWM output signal output by the digital control circuit module, so that the service life of the battery can not be influenced when the charging device charges the battery.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a digital charging device according to an embodiment of the present invention;
FIG. 2 illustrates a schematic structural diagram of a main power circuit module according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a power factor correction circuit according to an embodiment of the invention;
FIG. 4 is a flow chart of a digital charging method according to an embodiment of the invention;
fig. 5 shows a flowchart of a method of five-stage charging according to an embodiment of the invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
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. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The following describes a digital charging apparatus according to an embodiment of the present invention in detail with reference to the accompanying drawings. It should be noted that these examples are not intended to limit the scope of the present disclosure.
The digital charging device according to the embodiment of the invention is described in detail by fig. 1 to 3.
For better understanding of the present invention, a digital charging device according to an embodiment of the present invention is described in detail below with reference to fig. 1, and fig. 1 is a schematic structural diagram illustrating the digital charging device according to an embodiment of the present invention.
As shown in fig. 1, a schematic structural diagram 100 of a digital charging apparatus in an embodiment of the present invention includes:
and the main power circuit module 11, the main power circuit module 11 is configured to convert the received power frequency direct current voltage into a charging voltage, and output the charging voltage to the electric vehicle battery load.
As shown in fig. 2, fig. 2 is a schematic diagram illustrating a structure of a main power circuit module 11 according to an embodiment of the present invention.
The power tube module 111, the half-bridge LLC circuit module 112 and the high-frequency isolation transformer module 113 are connected in series in sequence to form the main power circuit module 11. The power transistor module 111 forms a complementary symmetric structure by two power metal-oxide semiconductor field effect transistors (MOSFETs) and two rectifier diodes, so that the two MOSFETs are respectively turned on by 50% to turn on a Zero Voltage Switch (ZVS), and the two rectifier diodes turn off a Zero Current Switch (ZCS).
Wherein, the high frequency transformer adopts PMI5027 magnetic core and uses sandwich winding. The conducting wire adopts a multi-strand parallel winding mode, the conducting wire is wound in layers, and the secondary side is arranged between the primary sides.
In one embodiment of the invention, two power MOSFET transistors Q3 and Q4 are connected in series. The drain electrode of the MOSFET Q3 is connected with the positive electrode of the PFC output, the gate electrode is connected with the source electrode of the MOSFET Q4, and the source electrode of the MOSFET Q4 is connected with the negative electrode of the PFC. The gate signals of the MOSFET transistors Q3 and Q4 are controlled by the DSP via an isolation transformer T1 circuit and a MOSFET drive circuit. The MOSFET tubes Q3, Q4, resonant inductors Lr, Lm, resonant capacitor Cr and high frequency transformer T2 constitute an LLC resonant circuit. The topological structure in the half-bridge LLC resonant circuit adopts a frequency conversion modulation mode, and the output voltage is stabilized by changing the frequency.
It should be noted that the resonant inductors Lr, Lm and the high-frequency transformer T2 are wound using PQ and PMI cores, respectively. The inductor and the transformer adopt a sandwich type winding method. The conducting wire adopts a multi-strand winding mode and then is wound in layers, and the secondary side is arranged between the primary sides.
The first sampling module 12, the first sampling module 12 is configured to collect the charging voltage and collect the output current of the main power circuit module 11, obtain a first sampling voltage and a first sampling current, and output the first sampling voltage and the first sampling current.
And the digital control circuit module 13, the digital control circuit module 13 is configured to output a PWM output signal according to the received first sampling voltage and the received first sampling current, when the first sampling voltage is less than or equal to a first preset voltage value or the first sampling current is less than or equal to a first preset current value, the digital control circuit module 13 adjusts the PWM output signal by using a PID adjustment subroutine, and performs signal amplification processing on the PWM output signal to obtain a DSP drive signal, and the DSP drive signal of the digital control circuit module 13 is used for controlling the main power circuit module 11 to output the charging voltage.
In an embodiment of the present invention, the digital control circuit module 13 compares the collected first sampling voltage and the collected first sampling current with a first preset voltage value and a first preset current value set inside the digital control circuit module 13, and when the collected first sampling voltage is greater than the first preset voltage value or the first sampling current value is greater than the first preset current value, the output of the PWM output signal is stopped, otherwise, the PWM output signal is compensated by the PI compensator, and the effect of stabilizing the output voltage is achieved by adjusting the frequency of the driving signal.
In one embodiment of the present invention, the digital control circuit module 13 includes: a first digital control circuit 131 and a first driving circuit 132.
The first digital control circuit 131 is configured to receive a first sampled voltage and to receive a first sampled current. The first digital control circuit 131 compares the collected first sampling voltage and first sampling current with a first preset voltage value and a first preset current value set inside the digital control circuit module 13.
And when the collected first sampling voltage is greater than a first preset voltage value or the first sampling current is greater than a first preset current value, stopping outputting the PWM output signal, otherwise, compensating the PWM output signal through the PI compensator, and outputting a stable PWM output signal by adjusting the frequency of the driving signal.
The microprocessor of the first digital control circuit 131 is a MPC5604P chip based on Power PC architecture. Green Hills Tools are selected as a compiler of the digital control circuit.
The first driving circuit 132 is configured to perform signal amplification processing on the received PWM output signal of the first digital control circuit 131 to obtain a DSP driving signal, and the DSP driving signal is used to control the main power circuit module 11 to output the charging voltage.
In one embodiment of the present invention, the digital charging apparatus further includes a protection circuit module 14. The protection circuit module 14 is configured to receive the operation stop signal output by the digital control circuit module 13 when the first sampling voltage is greater than the first preset voltage value or the first sampling current is greater than the first preset current value, so that the protection circuit module 14 is in an open circuit state.
In one embodiment of the present invention, the protection circuit module 14 is configured to judge the voltage value of the received sampling circuit in real time by the digital control circuit module 13, and when the voltage value of the sampling circuit is judged to deviate from the preset value, the digital control circuit module 13 controls the switch of the relay in the protection circuit module 14, thereby controlling the charger output to be turned off.
In one embodiment of the present invention, the digital charging apparatus further includes a front stage circuit module 15. The input end of the preceding stage circuit module 15 is connected to the power frequency ac input power grid, and the preceding stage circuit module 15 obtains a power frequency dc voltage by rectifying, filtering and power factor correcting the received power frequency ac, and outputs the power frequency dc voltage to the main power circuit module 11.
In one embodiment of the present invention, the front-stage circuit module 15 may include: a power factor correction circuit 151, a second sampling module 152, a second digital control circuit 153, and a second driving circuit 154.
As shown in fig. 3, fig. 3 is a schematic diagram illustrating a structure of a power factor correction circuit according to an embodiment of the present invention. The bridge rectifier module 154a, the boost inductor module 154b, and the power switch module 154c are sequentially connected in series to form the power factor correction circuit 151.
The input end of the power factor correction circuit 151 is connected to the power frequency ac input grid, and the power factor correction circuit 151 performs rectification filtering and power factor correction on the received power frequency ac to obtain a power frequency dc voltage, and outputs the power frequency dc voltage to the main power circuit module 11.
The second sampling module 152 is configured to collect an input voltage of the power factor correction circuit 151 and an input current of the power factor correction circuit 151, obtain a second sampling voltage and a second sampling current, and output the second sampling voltage and the second sampling current.
The second digital control circuit 153 is configured to receive the second sampling voltage and the second sampling current, and when it is determined that the second sampling voltage is less than or equal to a second preset voltage value or when it is determined that the second sampling current is less than or equal to a second preset current value, the second digital control circuit 153 adjusts the PWM output signal of the second digital control circuit 153 using a duty-cycle predictive digital control algorithm.
The second driving circuit 154 is configured to perform signal amplification processing on the received PWM output signal of the second digital control circuit 153, and control the power factor correction circuit 151 to output the power frequency direct current voltage based on the PWM output signal of the second digital control circuit 153 after the signal amplification processing.
In one embodiment of the present invention, the PFC circuit 151 is implemented by digitally controlled two-phase interleaved PFC (Power Factor Correction).
The two-phase interleaved digital control PFC circuit adopts a two-channel interleaved parallel structure.
The first phase includes: the positive electrode output end of the rectifier bridge is connected with one end of an inductor L1, the other end of the inductor L1 is connected with the drain electrode of a power MOSFET Q1 and the positive electrode of a freewheeling diode D1, two ends of the inductor L1 are connected with a protection diode, the grid electrode of the power MOSFET Q1 is connected with the PWM-1A driving waveform of the DSP, and the drain electrode of the power MOSFET Q1 is grounded.
The second phase includes: the positive electrode output end of the rectifier bridge is connected with one end of an inductor L2, the other end of the inductor L2 is connected with the drain electrode of a power MOSFET Q2 and the positive electrode of a freewheeling diode D2, the two ends of the inductor L2 are connected with a protection diode, the grid electrode of the power MOSFET Q2 is connected with the PWM-1B driving waveform of the DSP, and the source electrode of the power MOSFET Q2 is grounded.
The negative electrodes of a freewheeling diode D1 and a diode D2 in the two-phase interleaved digital control PFC circuit are connected with a high-frequency filter capacitor Cr and an electrolytic energy storage capacitor, the electrolytic energy storage capacitor is connected with a cement resistor in series, and the cement resistor is connected with a normally open switch of the relay in parallel.
The two-phase interleaved digital control circuit is formed by components made of SiC materials, and the power MOSFET adopts a CMOS metal oxide semiconductor field effect transistor.
In the embodiment of the invention, the digitally controlled two-phase interleaved power factor can reach 0.998 in a steady state, which is obviously higher than that of an analog control mode, and the boost bidirectional interleaved PFC circuit is adopted, so that the power factor correction function can be realized and the stable low-ripple direct-current voltage can be output.
In an embodiment of the present invention, the second driving circuit 154 is configured to perform signal amplification processing on the received PWM output signal of the digital control circuit module 13 and the received PWM output signal of the second digital control circuit 153, and control the power factor correction circuit 151 to output the power frequency dc voltage based on the PWM output signal of the digital control circuit module 13 and the PWM output signal of the second digital control circuit 153 after the signal amplification processing.
In one embodiment of the present invention, the digital charging apparatus further includes a rectifying and filtering module 16. The rectifying and filtering module 16 is configured to perform rectifying and filtering processing on the received charging voltage output by the main power circuit module 11 to obtain a stable direct current voltage, and output the stable direct current voltage to the electric vehicle battery load.
In one embodiment of the present invention, the digital charging apparatus further includes a display module 17 and a Controller Area Network (CAN) communication module.
The input end of the display module 17 is connected with the output end of the digital control circuit module 13, and the display module 17 is configured to display the current charging state during the charging process of the electric vehicle.
An input of the CAN communication module 18 is connected to an output of the digital control circuit module 13, and the CAN communication module 18 is configured to communicate with the digital control circuit module 13. Wherein, the CAN communication tool selects Kvaser Leaf USB card.
According to the CAN communication module 18 in the embodiment of the invention, the data communication between the digital electric automobile charging device and the automobile body CAN be realized.
In one embodiment of the invention, the digital charging device further comprises an auxiliary power supply. The auxiliary power supply is configured to provide voltage signals to components and chips in the front-stage circuit module 15 and the digital control circuit module 13.
In one embodiment of the present invention, the auxiliary power input voltage is DC330V-440V, and 3 stable DC voltages are output through the isolation transformer to provide voltage signals to the components and chips in the front-stage circuit module 15 and the digital control circuit module 13. The main control chip in the auxiliary power supply adopts NCP1207A, and the main topological structure of the auxiliary power supply is flyback conversion.
The digital charging device of the embodiment has the advantages of small volume, intelligent charging and stable output voltage and current, so that the service life of the storage battery is prolonged. The device adopts the control topological structure, not only provides high efficiency, low-loss charging scheme, can make the battery full charge in order to reach very big protection battery not by the purpose of bad moreover fast. The problems of low conversion efficiency and low reliability in the automobile charging process are effectively solved, and therefore the service life of the battery is not influenced in the process of charging the battery by the charging device.
A digital charging method that can be implemented by the digital charging apparatus according to the embodiment of the invention is described below with reference to fig. 4.
Fig. 4 is a flowchart of a digital charging method according to an embodiment of the invention. As shown in fig. 4.
And S410, the charger starts to work after being connected with 220V mains supply.
And S420, initializing the system.
And S430, judging whether a storage battery pack is connected to the output end of the charger or not by detecting the voltage of the battery, if not, waiting, and if so, entering S440.
And S440, detecting whether the charger is over-temperature, if so, entering a charger protection state, and if not, entering S450.
And S450, entering five-stage charging selection.
And S460, detecting whether the battery is fully charged, returning to charging stage selection if the voltage of the system battery does not reach a system threshold value, and stopping charging if the battery is fully charged.
And S470, ending the charging.
Fig. 5 is a flowchart of a five-stage charging method according to an embodiment of the invention. As shown in fig. 5.
S451, the system enters a pre-charging stage, and the current is 7A for constant current charging. If the voltage of the single battery reaches 10.8V, the system proceeds to S452.
And S452, the system carries out charging overtime detection, if the time of the pre-charging stage exceeds 4 hours, the charger stops working, otherwise, the system enters the stage of S453 constant current charging 1.
At S453, the stage is constant current charged with a large current of 20A. When the voltage of the single battery reaches 14.4V, the process proceeds to S454.
And S454, detecting whether the charging time of the constant current charging 2 stage is over, and when the charging time is over 12 hours or the battery capacity is over 160AH, the system forcibly jumps to S455, otherwise, the system returns to S453.
At S455, this stage uses 16A current constant current charging. When the voltage of the single battery reaches 14.7V, S456 is entered.
S456, this stage is charged with a constant voltage of 14.7V. When the charging current drops to 3A, S457 is entered.
And S457, detecting the charging time overtime, stopping charging when the time exceeds 5 hours, and otherwise, entering the floating charging stage of S458.
S458, this stage is a floating charge stage, and the charging is terminated after the cumulative charging time of this stage is judged only by trickle charging at a constant voltage of 14.7V and the charging is terminated after exceeding 2 hours.
And S459, ending charging.
According to the embodiment of the invention, the technology of stopping immediately after full charge is adopted, and the charging is stopped immediately when the set condition is reached by detecting the voltage and the charging time of the battery, so that the technical problem that the service life of the battery is influenced in the process of charging the battery in the analog control charging method is effectively solved.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The method embodiment is described in a simpler way, and for the relevant points, reference is made to the description of the system embodiment. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications and additions or change the order between the steps after appreciating the spirit of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The functional blocks (such as the first sampling module, the main power circuit module, the digital circuit control module and the protection circuit module) in the above embodiments may be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A digital charging apparatus, comprising:
the main power circuit module is configured to convert the received power frequency direct current voltage into a charging voltage and output the charging voltage to an electric vehicle battery load;
a first sampling module configured to collect the charging voltage and collect an output current of the main power circuit module, obtain a first sampling voltage and a first sampling current, and output the first sampling voltage and the first sampling current;
the digital control circuit module is configured to output a PWM output signal according to the received first sampling voltage and the received first sampling current, when the first sampling voltage is smaller than or equal to a first preset voltage value or the first sampling current is smaller than or equal to a first preset current value, the digital control circuit module adjusts the PWM output signal by using a PID (proportion integration differentiation) adjusting subprogram and performs signal amplification processing on the PWM output signal to obtain the DSP driving signal, and the DSP driving signal of the digital control circuit module is used for controlling the main power circuit module to output the charging voltage.
2. The digital charging device of claim 1, wherein the digital control circuit module comprises:
a first digital control circuit configured to receive the first sampling voltage and receive the first sampling current, and when it is determined that the first sampling voltage is less than or equal to the first preset voltage value or it is determined that the first sampling current is less than or equal to the first preset current value, the first digital control circuit adjusts the PWM output signal using a PID adjustment subroutine and outputs the adjusted PWM output signal;
the first driving circuit is configured to perform signal amplification processing on the received PWM output signal of the first digital control circuit to obtain the DSP driving signal, and the DSP driving signal is used for controlling the main power circuit module to output the charging voltage.
3. The digital charging device of claim 1, further comprising:
a protection circuit module configured to receive a work stop signal output by the digital control circuit module when the first sampling voltage is greater than the first preset voltage value or the first sampling current is greater than the first preset current value, so that the protection circuit module is in an open circuit state.
4. The digital charging apparatus according to any one of claims 1 to 3, further comprising:
the power frequency alternating current power supply comprises a pre-stage circuit module, wherein the input end of the pre-stage circuit module is connected with a power frequency alternating current input power grid, the pre-stage circuit module obtains the power frequency direct current voltage by rectifying, filtering and power factor correcting the received power frequency alternating current, and outputs the power frequency direct current voltage to the main power circuit module.
5. The digital charging apparatus of claim 4, wherein the front stage circuit module comprises:
the input end of the power factor correction circuit is connected with the power frequency alternating current input power grid, the power factor correction circuit obtains the power frequency direct current voltage by rectifying, filtering and power factor correcting the received power frequency alternating current, and outputs the power frequency direct current voltage to the main power circuit module;
a second sampling module configured to collect an input voltage of the power factor correction circuit and an input current of the power factor correction circuit, obtain a second sampling voltage and a second sampling current, and output the second sampling voltage and the second sampling current;
a second digital control circuit configured to receive the second sampled voltage and the second sampled current, the second digital control circuit adjusting a PWM output signal of the second digital control circuit using a duty cycle predictive digital control algorithm when the second sampled voltage is determined to be less than or equal to the second preset voltage value or when the second sampled current is determined to be less than or equal to the second preset current value;
the second drive circuit is configured to perform signal amplification processing on the received PWM output signal of the second digital control circuit, and the power factor correction circuit is controlled to output power frequency direct current voltage based on the PWM output signal of the second digital control circuit after the signal amplification processing.
6. The digital charging device according to claim 5, wherein the second driving circuit is configured to perform signal amplification processing on the received PWM output signal of the digital control circuit module and the received PWM output signal of the second digital control circuit, and control the power factor correction circuit to output the power frequency direct current voltage based on the PWM output signal of the digital control circuit module and the received PWM output signal of the second digital control circuit after the signal amplification processing.
7. The digital charging device of claim 1, further comprising:
and the rectification filtering module is configured to perform rectification filtering processing on the received charging voltage output by the main power circuit module to obtain stable direct-current voltage, and output the stable direct-current voltage to an electric vehicle battery load.
8. The digital charging device of claim 1, further comprising:
the input end of the display module is connected with the output end of the digital control circuit module, and the display module is configured to display the current charging state in the charging process of the electric automobile;
the input end of the CAN communication module is connected with the output end of the digital control circuit module, and the CAN communication module is configured to communicate with the digital control circuit module.
9. The digital charging device of claim 4, further comprising:
an auxiliary power supply configured to provide voltage signals to components and chips in the pre-stage circuit module and the digital control circuit module.
10. The digital charging device according to claim 5, wherein the power factor correction circuit employs a two-phase interleaved Boost chopper power factor Boost PFC circuit.
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| CN201811339620.2A CN111181233A (en) | 2018-11-12 | 2018-11-12 | Digital charging device |
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| CN201811339620.2A CN111181233A (en) | 2018-11-12 | 2018-11-12 | Digital charging device |
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| CN103618366A (en) * | 2013-11-22 | 2014-03-05 | 镇江赛尔尼柯自动化有限公司 | Intelligent ship charging machine and charging method |
| CN103754133A (en) * | 2014-01-26 | 2014-04-30 | 方贵龙 | Parallel high-power electromobile direct-current charging power system based on STM32 |
| CN107852008A (en) * | 2015-07-21 | 2018-03-27 | 戴森技术有限公司 | Power supply |
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Application publication date: 20200519 |
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| RJ01 | Rejection of invention patent application after publication |