CN106505846B - A kind of soft starting circuit and soft-start method and direct-current charging post - Google Patents
A kind of soft starting circuit and soft-start method and direct-current charging post Download PDFInfo
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- CN106505846B CN106505846B CN201611015271.XA CN201611015271A CN106505846B CN 106505846 B CN106505846 B CN 106505846B CN 201611015271 A CN201611015271 A CN 201611015271A CN 106505846 B CN106505846 B CN 106505846B
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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
- H02M1/36—Means for starting or stopping converters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/30—Constructional details of charging stations
- B60L53/31—Charging columns specially adapted for electric vehicles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention provides a kind of soft starting circuit and soft-start methods and direct-current charging post, including controller, rectification mould group, first switch, second switch, reverse-filling diode, the controller acquires the measured value of three test points in real time, and the information of battery pack charging voltage and electric current is obtained from Vehicular battery management system BMS, first test point detects the voltage between the rectification mould group positive output end and negative output terminal, second test point detection detection charging pile exports the voltage at positive and negative end, and third test point is used to detect charging pile and rectify the output electric current of mould group；The controller rectifies the output voltage and electric current of mould group, and the on-off timing of control first switch and the second switch by adjusting, so that avoiding the generation of surge current in starting charging process.The surge current when present invention effectively inhibits starting to charge avoids the damage of electrical part caused by due to inrush current shock, by the control to switching device timing, avoids the case where its contact is adhered.
Description
Technical field
The present invention relates to new-energy automobile charging technique fields, and in particular, to a kind of soft starting circuit, it is corresponding soft to open
Dynamic method, and the direct-current charging post using the soft starting circuit and method.
Background technique
Common starting charging scheme, mainly passes through controller and battery pack management system in direct-current charging post
(BMS) communicate, and obtain battery pack current voltage, highest allows charging voltage and initial charge current (usually battery pack is most
Big charging current), voltage and current target value when controller is in this, as rectification mould group starting.When rectifying the starting of mould group,
Output voltage rises rapidly, when output voltage is more than battery pack voltage, since charge circuit current-limiting resistance is very small, and electric current
It rises rapidly, before reaching cut-off current, rectification mould group output voltage continues rapid increase, causes to generate surge current；If
Switch-closed time is improper, will aggravate this surge current.It can be seen that this method merely by rectification mould group current limliting speed and
Precision, it is difficult to effectively suppress or eliminate surge current, each component life of charge circuit is be easy to cause to shorten or damage.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of soft starting circuit and soft-start method and directly
Current charge stake, the surge current being able to suppress in starting charging process, avoids surge current from causing impact failure to electrical part, leads to
The control to switching device timing is crossed, the case where its contact is adhered is avoided.
In order to achieve the above object, the present invention is realized by the following scheme:
According to an aspect of the present invention, a kind of soft starting circuit is provided, comprising: controller, rectification mould group, first open
Pass, second switch, reverse-filling diode, the first switch and the second switch include control terminal and a contact, institute
Stating rectification mould group includes positive and negative output end and control terminal, in which:
The control terminal of the first switch, the control terminal of the second switch, it is described rectification mould group control terminal respectively with
The positive output end of the controller electrical connection, the rectification mould group is connected with the anode of the reverse-filling diode, described anti-down
The cathode for filling diode is connected with the contact of the first switch, the negative output terminal and the second switch of the rectification mould group
Contact is connected；
The controller acquires the measured value of the first test point, the second test point, third test point in real time, and from vehicle electrical
Pond management system BMS obtains the information of battery pack charging voltage and electric current, and first test point is detecting the rectification mould group just
Voltage between output end and negative output terminal, the second test point detection detection charging pile exports the voltage at positive and negative end, described
Third test point be located at rectification mould group negative output terminal and the contact of second switch between, third test point for detect charging pile and
Rectify the output electric current of mould group；In order to provide the charging voltage and electric current of battery demand packet, the controller is by adjusting rectification
The output voltage and electric current of mould group, and the on-off timing of control first switch and the second switch, so that in starting charging process
In, avoid the generation of surge current.
According to the second aspect of the invention, a kind of soft-start method using foregoing circuit is provided, the method includes such as
Lower step:
Step 1: the voltage of controller real-time monitoring the first test point and the second test point, the first test point and the second detection
The voltage measurement error precision of point is respectively ± M1%, ± M2%, the electric current of real-time monitoring third test point, measures second this moment
The voltage of test point is V2；
Step 2: controller sets rectification mould group output voltage target value as zero, set rectification mould group output current limit as
Zero；Controller starting rectification mould group output, while rectification mould group output voltage target value is controlled by zero with normal speed C1Rise
For
Step 3: when the voltage of the first test point reaches the voltage-target in step 2When, keep voltage target
ValueOutput current limit constant, in step 2 is constant, and controller controls first switch and the second switch closure；
Step 4: after controller detects first switch and the second switch closure, voltage-target is basic in step 2
On, with rate C2Increase the output voltage of rectification mould group, while controlling rectification mould group output current limit by zero jump is I1；
Step 5: when the current value of third test point is more than or equal to current limit I1When, controller is with rate B1Increase rectification
Mould group exports current limit, until rectification mould group output current limit increases to BMS request charging current I0；Meanwhile rectifying mould
The target voltage of group continues growing；
Step 6: when the target voltage of rectification mould group increases toWhen, the output target of controller control rectification mould group
Voltage jump is that the battery pack highest of BMS request allows charging voltage Vbat；
So far, soft start charging process terminates, into normal charging process.
Preferably, in step 1, the M1% < 1%, the M2% < 5%.
Preferably, in step 2 and step 4, the rate C1>=5 times of rate C2。
Preferably, in step 5, the current limit I1For 5~10A；The rate B1, recommend 4A/S≤B1≤ 25A/S,
Under conditions of meeting starting time requirement, low rate is selected as far as possible.
According to the third aspect of the invention we, it provides a kind of comprising above-mentioned soft starting circuit and using above-mentioned soft-start method
Direct-current charging post.
Compared with prior art, the present invention have it is following the utility model has the advantages that
The present invention uses above-mentioned soft start-up scheme, in its applicable charge circuit, when starting effectively being inhibited to charge
Surge current avoids the damage of electrical part caused by due to inrush current shock, by the control to switching device timing, avoids
The case where its contact is adhered.
The present invention uses above-mentioned soft start-up scheme, can be good at suitable for direct-current charging post.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the soft start charging circuit block diagram of one embodiment of the invention；
Fig. 2 is the soft start charging flow figure of one embodiment of the invention；
Fig. 3 is the soft start charging process each point waveform timing chart of one embodiment of the invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
As shown in Figure 1, a kind of soft starting circuit, including it is controller, rectification mould group, first switch K1, second switch K2, anti-
Flow backward diode D1, the first switch K1, the second switch K2 respectively include control terminal and a contact, the rectification mould group
Including positive-negative output end and control terminal；The controller connects the first test point, the second test point, third test point, in which:
The control terminal of the first switch K1, the control terminal of the second switch K2, the control terminal point of the rectification mould group
It is not electrically connected with the controller, the anode of the rectification mould group is connected with the anode of the reverse-filling diode D1, described anti-
The cathode for flowing backward diode D1 is connected with the contact of the first switch K1；The cathode and the second switch of the rectification mould group
The contact of K2 is connected；
First test point detects the voltage between the rectification mould group positive output end and negative output terminal, the detection of the second test point
Detection charging pile exports the voltage at positive and negative end, third test point be located at rectification mould group negative output terminal and second switch contact it
Between, third test point is used to detect charging pile and rectify the output electric current of mould group.The controller is from Vehicular battery management system
BMS obtains the information of battery pack charging voltage and electric current, and the controller acquires the first test point, the second test point, the in real time
The measured value of three test points.
In order to provide the charging voltage and electric current of battery demand packet, the controller is electric by the output for adjusting rectification mould group
Pressure and electric current, and the on-off timing of control first switch and the second switch, so that avoiding surge in starting charging process
The generation of electric current.
In an alternative embodiment of the invention, soft start is carried out using foregoing circuit, the steps include:
Step 1: the voltage of controller real-time monitoring the first test point and the second test point, the first test point and the second detection
The voltage measurement error precision of point is respectively ± M1%, ± M2%；The electric current of real-time monitoring third test point, measures second this moment
The voltage of test point is V2；
Step 2: controller sets rectification mould group output voltage target value as zero, set rectification mould group output current limit as
Zero.Controller starting rectification mould group output, while rectification mould group output voltage target value is controlled by zero with normal speed C1 rising
For
Step 3: when the voltage of the first test point reaches the voltage-target in step 2, keep voltage-target it is constant,
Output current limit in step 2 is constant, control first switch and the second switch closure；
Step 4: after detecting first switch and the second switch closure, in step 2 on the basis of voltage-target, with speed
Rate C2 increases the output voltage of rectification mould group, while controlling rectification mould group output current limit and jumping I by zero1；
Step 5: when the current value of third test point is greater than, equal to current limit I1When, rectification mould group is increased with rate B 1
Current limit is exported, until rectification mould group output current limit increases to BMS request charging current I0；Meanwhile rectifying mould group
Target voltage continues growing；
Step 6: when the target voltage of rectification mould group increases toWhen, the output target voltage jump of control rectification mould group
Battery pack highest for BMS request allows charging voltage Vbat；
So far, soft start charging process terminates, into normal charging process.
In an alternative embodiment of the invention, it using foregoing circuit and method, charges for direct-current charging post, charging pile is specific
The course of work it is as follows:
Firstly, charging pile self-test is completed, and shakes hands success with Vehicular battery management system (BMS), charging pile is obtained from BMS
Battery highest allows charging voltage Vbat, request charging current I0；Vehicle enters the ready state of charging.It is opened below into soft
The dynamic charging stage:
Step 1: the voltage of controller real-time monitoring the first test point 1 and the second test point 2, measurement error precision difference
For ± M1%, ± M2%；The electric current of real-time monitoring third test point 3, the voltage for measuring the second test point 2 this moment is V2。
Step 2: controller control rectification mould group output voltage target value is by zero with rate C1It rises toAnd start
The output of mould group is rectified, while controlling rectification mould group output current limit is zero；If with this moment for t0Moment indicates t with t0Moment it
Any time afterwards, then the voltage of the first test point 1 and the relationship of time can be expressed as: vO(t)=C1×(t-t0)。
Step 3:t1The voltage at moment, the first test point 1 reaches the target voltage in step 2When, keep target electricity
Pressure value is constant, and current limit is constant, first switch K1, second switch K2 closure.
Step 4: after detecting first switch K1, second switch K2 closure, in step 2 on the basis of target voltage, with
Rate C2Increase output voltage, while controlling output current limit by zero jump is I1, this moment for t2, then first test point 1
Voltage follow rectifies mould group output voltage, and the voltage of the first test point and the relationship of time can be expressed as: vO(t)=C1×(t1-
t0)+C2×(t-t2).The current limit I1It is small as far as possible, such as I1It can be 5~10A.
Step 5:t3The current value at moment, third test point 3 is equal to current limit I described in step 41, with low rate B1Increase
It is powered on restriction value, until current limit increases to BMS request charging current I0, then the current value of third test point 3 and time
Relationship can be expressed as: iO(t)=B1×(t-t3)+I1；Meanwhile the target voltage for rectifying mould group continues with low rate C2Increase,
But the voltage of the first test point 1 is in t3Do not increase followed by target voltage after moment, but as cell voltage is slowly increased.
t4Moment, the electric current of third test point 3 reach BMS request charging current I0.
Step 6:t6Moment, rectification mould group target voltage increase toThe output target voltage of control rectification mould group is jumped
The battery pack highest for becoming BMS request allows charging voltage Vbat；So far, soft start charging process terminates, into charging normal
Process.
As a preferred embodiment, the rate C1>=5C2, t0~t4 are controlled in 8~10S；4A/S≤B1≤25A/
S selects low rate under conditions of meeting starting time requirement as far as possible.
As a preferred embodiment, in step 1, the measurement error essence of first test point 1 and the second test point 2
Spend voltage M1、M2It is small as far as possible, M2% < 5%, M1% < 1%.
It can see from the expression formula of the electric current of third test point 3, entire start-up course effectively inhibits surge current,
The damage of electrical part caused by due to inrush current shock is avoided, by the control to switching device timing, avoids its contact
The case where being adhered.
The waveform timing chart of the above stage each point, referring to Fig. 3.
The present invention effectively inhibits surge current when starting charging, avoids because of wave in its applicable charge circuit
Gush rush of current and caused by electrical part damage, by the control to switching device timing, avoid the case where its contact is adhered.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (6)
1. a kind of soft-start method, which is characterized in that the method uses soft starting circuit, and the soft starting circuit includes: control
Device processed, rectification mould group, first switch, second switch, reverse-filling diode, the first switch and the second switch include
Control terminal and a contact, the rectification mould group includes positive and negative output end and control terminal, in which:
The control terminal of the first switch, the control terminal of the second switch, it is described rectification mould group control terminal respectively with it is described
The positive output end of controller electrical connection, the rectification mould group is connected with the anode of the reverse-filling diode, the reverse-filling two
The cathode of pole pipe is connected with the contact of the first switch, the negative output terminal of the rectification mould group and the contact of the second switch
It is connected；
The controller acquires the measured value of the first test point, the second test point, third test point in real time, and from Vehicular battery pipe
Reason system BMS obtains the information of battery pack charging voltage and electric current, the first test point detect the rectification mould group positive output end and
Voltage between negative output terminal, the second test point detection detection charging pile export the voltage at positive and negative end, and third test point is located at whole
It flows between mould group negative output terminal and the contact of second switch, third test point is used to detect charging pile and rectifies the output electricity of mould group
Stream；In order to provide the charging voltage and electric current of battery demand packet, the controller by adjust rectification mould group output voltage and
Electric current, and the on-off timing of control first switch and the second switch, so that avoiding surge current in starting charging process
Generation；
Described method includes following steps:
Step 1: the voltage of controller real-time monitoring the first test point and the second test point, the first test point and the second test point
Voltage measurement error precision is respectively ± M1%, ± M2%, the electric current of real-time monitoring third test point, measures the second detection this moment
The voltage of point is V2；
Step 2: controller sets rectification mould group output voltage target value as zero, set rectification mould group output current limit as zero；Control
Device starting rectification mould group output, while rectification mould group output voltage target value is controlled by zero with normal speed C1It rises to
Step 3: when the voltage of the first test point reaches the voltage-target in step 2When, keep voltage-targetOutput current limit constant, in step 2 is constant, and controller controls first switch and the second switch closure；
Step 4: after controller detects first switch and the second switch closure, in step 2 on the basis of voltage-target, with
Rate C2Increase the output voltage of rectification mould group, while controlling rectification mould group output current limit by zero jump is I1；
Step 5: when the current value of third test point is more than or equal to current limit I1When, controller is with rate B1Increase rectification mould group
Current limit is exported, until rectification mould group output current limit increases to BMS request charging current I0；Meanwhile rectifying mould group
Target voltage continues growing；
Step 6: when the target voltage of rectification mould group increases toWhen, the output target voltage of controller control rectification mould group is jumped
The battery pack highest for becoming BMS request allows charging voltage Vbat；
So far, soft start charging process terminates, into normal charging process.
2. a kind of soft-start method according to claim 1, which is characterized in that in step 1, the M1% < 1%, it is described
M2% < 5%.
3. a kind of soft-start method according to claim 1, which is characterized in that in step 2 and step 4, the positive constant speed
Rate C1>=5 times of rate C2。
4. a kind of soft-start method according to claim 1-3, which is characterized in that in step 5, the electric current limit
Value I1For 5~10A.
5. a kind of soft-start method according to claim 4, which is characterized in that in step 5, the rate B1, value are as follows:
4A/S≤B1≤ 25A/S selects low rate under conditions of meeting starting time requirement as far as possible.
6. a kind of direct-current charging post using any one of the claims 1-5 the method.
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| CN201611015271.XA CN106505846B (en) | 2016-11-15 | 2016-11-15 | A kind of soft starting circuit and soft-start method and direct-current charging post |
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| CN201611015271.XA CN106505846B (en) | 2016-11-15 | 2016-11-15 | A kind of soft starting circuit and soft-start method and direct-current charging post |
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| CN106505846B true CN106505846B (en) | 2019-03-26 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110103737B (en) * | 2018-01-19 | 2021-05-14 | 郑州宇通客车股份有限公司 | Mobile charging control method and device for electric automobile |
| CN108839581B (en) * | 2018-06-29 | 2021-06-22 | 北京新能源汽车股份有限公司 | Power supply control method, device and equipment for electric automobile |
| CN110588436A (en) * | 2019-10-23 | 2019-12-20 | 清远市昭元电力科技有限公司 | Charging pile control module |
| CN110979080B (en) * | 2019-12-20 | 2021-03-16 | 北京理工大学 | BMS self-adaptive control method and system for charging voltage |
| EP4283316A4 (en) * | 2021-03-04 | 2024-05-15 | Huawei Digital Power Tech Co Ltd | Detection circuit, backflow prevention system, and charging pile |
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| CN205319756U (en) * | 2016-01-19 | 2016-06-15 | 江门市甜的电器有限公司 | Fill electric pile control circuit |
| CN105730265A (en) * | 2016-01-21 | 2016-07-06 | 易事特集团股份有限公司 | Charging starting device for DC charging pile for electric automobile |
| CN205429808U (en) * | 2016-03-16 | 2016-08-03 | 广州冠廷机电设备有限公司 | Electric automobile removes on -vehicle machine that charges of quick direct current of pocket non - |
| CN105871000A (en) * | 2016-04-08 | 2016-08-17 | 深圳市清友能源技术有限公司 | Current control method for direct current charger |
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Denomination of invention: A Soft Start Circuit, Soft Start Method and DC Charging station Effective date of registration: 20230616 Granted publication date: 20190326 Pledgee: The Bank of Shanghai branch Caohejing Limited by Share Ltd. Pledgor: SHANGHAI ENNEAGON ENERGY TECHNOLOGY Co.,Ltd. Registration number: Y2023310000261 |