CN113829940A - NB-IOT-based intelligent electric bicycle charging system and working method thereof - Google Patents
NB-IOT-based intelligent electric bicycle charging system and working method thereof Download PDFInfo
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- 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
- B60L53/60—Monitoring or controlling charging stations
- B60L53/68—Off-site monitoring or control, e.g. remote control
-
- 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
- B60L53/60—Monitoring or controlling charging stations
- B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
-
- 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
- B60L53/60—Monitoring or controlling charging stations
- B60L53/66—Data transfer between charging stations and vehicles
- B60L53/665—Methods related to measuring, billing or payment
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- 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
- B60L2200/00—Type of vehicles
- B60L2200/46—Vehicles with auxiliary ad-on propulsions, e.g. add-on electric motor kits for bicycles
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- 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
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- 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
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- 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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- 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
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Abstract
The invention discloses an electric bicycle intelligent charging system based on NB-IOT (NB-internet of things), which comprises a user terminal, a cloud platform server and a plurality of direct current charging piles, wherein each direct current charging pile is provided with a first NB-IOT communication module which is in communication connection with the cloud platform server; the direct current charging pile is also provided with a control system, and the human-computer interaction module is used for receiving a charging instruction of the holder server; the microprocessor is used for controlling the operation of the direct current charging pile; the electrode detection module is used for detecting the polarity of a storage battery connected with the direct current charging pile; the power supply module is used for providing dynamic output voltage and current for charging the storage battery; the power module adopts a self-adjusting three-stage charging method to charge the storage battery; the electric energy output control module is used for controlling the on-off of the storage battery charging circuit. The invention can detect the polarity of the storage battery to avoid the damage of the storage battery, adopts a self-adjusting three-stage charging method to charge the storage battery, further avoids the damage of the storage battery caused by the charging when the storage battery is over-discharged, and provides a safe, convenient and efficient charging system for users.
Description
Technical Field
The invention belongs to the technical field of charging piles, and particularly relates to an electric bicycle intelligent charging system based on NB-IOT and a working method thereof.
Background
The electric bicycle is widely applied to daily life of people as a vehicle for short-distance travel. At present, the storage battery power supply of the electric bicycle mainly adopts two forms of a lead-acid storage battery and a lithium ion storage battery, and the storage battery power supply must be realized by a charging device.
However, the problem that the safety use knowledge of the charger is deficient generally exists in the industry at present, so that people often have non-compliant behaviors such as long-time charging, charging by using an inferior charger, private wiring, non-standard power utilization and the like in the use process, and the safety accidents of the storage battery in the charging process are more and more.
Among them, the existing electric bicycle generally uses three (36V) or four (48V)12V, 14Ah batteries in series to form the accumulator battery, which belongs to the dc circuit system, and it has the defect of easy short circuit, and causes fire. The main reason is that the storage battery of the electric bicycle has overlarge resistance when in contact with an electric circuit, a control circuit and the like connected with the storage battery in the using process, so that the high temperature and overload of components are caused, and finally, the heating explosion accident occurs. In addition, since most electric bicycles are charged at night, a sufficient charging time is required. However, if the battery continues to be charged while it is fully charged, the charger and the battery continue to generate heat, which may cause a fire.
Among them, the main cause of fire caused by the charger is unsafe charging behavior, such as: firstly, the battery is overcharged to cause fire, and the temperature is continuously raised due to the connection of a power supply, so that the fire is caused; secondly, due to temporary wiring, the power line is damaged due to an incorrect wiring mode, so that the metal copper wire is exposed, and a fire disaster is caused; thirdly, the user randomly uses the charger which is not matched with the model of the electric bicycle in the daily charging process, so that the storage battery is irreversibly damaged, and high-temperature explosion is caused.
With the development of technology, public charging carports have become essential infrastructure for cells. The public bicycle shed that charges makes the electric bicycle of district resident charge safe convenient more, has reduced the emergence of electric bicycle safety accident that charges to a great extent. However, the plugging and the storage of the charger are very complicated, and even the safety charging accident caused by the quality problem of the charger still happens occasionally.
Therefore, it is desirable to provide a convenient, safe and efficient charging system for electric bicycles to solve the above problems.
Disclosure of Invention
The invention aims to provide an NB-IOT (NB-IOT) -based intelligent electric bicycle charging system and a working method thereof, which are used for solving at least one technical problem in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides an electric bicycle intelligent charging system based on NB-IOT, which comprises a user terminal, a cloud platform server and a plurality of direct current charging piles, wherein the user terminal is in communication connection with the cloud platform server, and each direct current charging pile is provided with a first NB-IOT communication module and is in communication connection with the cloud platform server through the first NB-IOT communication module;
the direct current charging pile is also provided with a control system, and the control system comprises a human-computer interaction module, a microprocessor, an electrode detection module, a power supply module and an electric energy output control module;
the human-computer interaction module is used for displaying charging information of the direct-current charging pile and receiving a charging instruction of the holder server, wherein the charging instruction is generated after the cloud platform server responds to a charging request of the user terminal;
the microprocessor is used for processing the operation data of the direct current charging pile and controlling the operation of the direct current charging pile;
the electrode detection module is used for detecting the polarity of a storage battery connected with the direct current charging pile and adjusting the polarity of the output voltage of the direct current charging pile according to the polarity detection result;
the power supply module is used for providing a working power supply for the operation of the human-computer interaction module, the microprocessor, the electrode detection module and the electric energy output control module and providing dynamic output voltage and current for charging a storage battery; the power module adopts a self-adjusting three-stage charging method to charge the storage battery;
and the electric energy output control module is used for controlling the on-off of the storage battery charging circuit according to the instruction of the microprocessor.
In one possible design, the direct current charging pile is further provided with a safety protection system, and the safety protection system comprises an electric protection module, an emergency stop module and a control guide module;
the electric protection module is used for electric protection of the power input side of the direct current charging pile and electric isolation protection of power supply of the control system;
the emergency stop module is provided with an emergency stop button and is used for cutting off the output of the power supply module by using the emergency stop button when a fault occurs in the charging process of the direct current charging pile;
the control and guide module is used for monitoring the charging interface of the direct current charging pile in real time, sending current maximum value data to the direct current charging pile and reading the saturation degree of the current charging storage battery.
In one possible design, the direct current charging pile is further provided with an operation management system, the operation management system comprises a second NB-IOT communication module, and data interaction is performed between the second NB-IOT communication module and the control system, so that transmission of consumption information of the direct current charging pile and monitoring of an operation state are achieved.
In a possible design, the control system further comprises a metering module, the metering module is provided with a communication interface, and sends real-time electric energy data in the operation process of the direct current charging pile to the microprocessor through the communication interface.
In one possible design, the control system further includes a transaction settlement module and a storage module;
the transaction settlement module is used for processing the charging transaction data of the user and transmitting the charging transaction data to the microprocessor, and providing an identity authentication management and third-party payment channel for the user terminal;
the storage module is used for storing the charging transaction data and the direct current charging pile operation parameters.
In one possible design, the microprocessor is provided with an FM33G048 chip with an ARM Cortex-M0 core.
In one possible design, the power supply module employs a high frequency switching power supply;
the main circuit of the high-frequency switching power supply comprises a phase-shifted full-bridge control circuit, and an output rectifying circuit of the phase-shifted full-bridge control circuit adopts a full-wave rectifying mode;
the control circuit of the high-frequency switching power supply comprises a phase-shifting control chip UC3875, wherein the phase-shifting control chip UC3875 is provided with a power supply phase-shifting PWM control integrated circuit, and is used for performing mobile control on the phases of two half-bridge switching circuits, realizing constant-frequency PWM control of a half-bridge power stage, and completing zero-voltage switching-on under the state that the output capacitor is discharged by virtue of charging and discharging of an output capacitor of a switching device.
In one possible design, when the power module charges the battery using a self-adjusting three-stage charging method, the power module is specifically configured to:
detecting whether the storage battery is overdischarged, if so, performing self-regulation activation charging on the storage battery by using the first constant current, and then boosting charging on the storage battery by using the second constant current when the voltage of the storage battery reaches a first voltage threshold value, otherwise, directly boosting charging on the storage battery by using the second constant current;
and when the voltage of the storage battery reaches a second voltage threshold value, directly charging the storage battery by using the first constant voltage until the storage battery is charged in a floating charge mode when the voltage of the storage battery reaches a third voltage threshold value.
In one possible design, the cloud platform server provides a plurality of functional modules to the user terminal, the plurality of functional modules including at least: the system comprises a user management module, a direct current charging pile positioning module, a reserved charging module and a charging payment module.
In a second aspect, the invention provides an operating method of an NB-IOT-based intelligent electric bicycle charging system, which includes:
the method comprises the steps that a user terminal sends a charging request to a cloud platform server, and the cloud platform server generates a charging instruction according to the charging request and sends the charging instruction to a direct current charging pile;
after receiving the charging instruction, the direct current charging pile detects the polarity of the storage battery to be charged and adjusts the polarity of the corresponding charging output voltage according to the polarity detection result;
judging the voltage model of the storage battery to be charged, and outputting a PWM signal through a microprocessor to control a driving power supply module to configure the charging voltage of the storage battery with the corresponding model;
a self-adjusting three-stage charging method is adopted to charge the storage battery;
when the charging is finished or the charging is abnormal, the microprocessor sends an instruction to the electric energy output control module to control the on-off of the storage battery charging circuit.
Has the advantages that:
the cloud management of the shared direct current charging pile is realized through the NB-IOT network, so that a user can conveniently operate the direct current charging pile through the mobile terminal, and the user experience is good; the modularized detachable control system is arranged in the direct current charging pile, so that the direct current charging pile can be widely applied to various application scenes, and the installation and wiring are simple; a man-machine interaction module is arranged in a control system to display charging information of the direct current charging pile and receive a charging instruction of the holder server; the microprocessor is used for processing the operation data of the direct current charging pile so as to control the operation of the direct current charging pile; the electrode detection module is arranged to detect the polarity of a storage battery connected with the direct current charging pile, and the polarity of the output voltage of the direct current charging pile is adjusted according to the polarity detection result so as to avoid the storage battery from being damaged; the power supply module is arranged to charge the storage battery by adopting a self-adjusting three-stage charging method, so that the storage battery is prevented from being damaged by adopting large-current charging when the storage battery is overdischarged; through setting up electric energy output control module, can be according to microprocessor's instruction control battery charging circuit's break-make, avoid overcharging to lead to the overheated explosion accident of battery to take place.
Drawings
Fig. 1 is a block diagram of an intelligent NB-IOT-based electric bicycle charging system in this embodiment;
FIG. 2 is a schematic diagram of the microprocessor chip connections in this embodiment;
FIG. 3 is a circuit configuration diagram of an electrode detection module in the present embodiment;
fig. 4 is a block diagram of the power supply module in the present embodiment;
FIG. 5 is a schematic structural diagram of the phase-shifted full-bridge control circuit in the present embodiment;
fig. 6 is a schematic structural view of the full-wave rectifier circuit in the present embodiment;
fig. 7 is a schematic wiring diagram of the phase shift control chip UC3875 in this embodiment;
fig. 8 is a schematic circuit diagram of the protection circuit in the present embodiment;
fig. 9 is a schematic circuit diagram showing an HLW8112 chip in the present embodiment;
fig. 10 is a schematic circuit configuration diagram showing a memory module chip in this embodiment;
FIG. 11 is a flowchart illustrating a method of operating the NB-IOT based intelligent charging system for electric bicycles in the present embodiment;
fig. 12 is a flowchart of a practical application in the present embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments in the present description, belong to the protection scope of the present invention.
Examples
As shown in fig. 1 to 10, in a first aspect, the present invention provides an NB-IOT based intelligent charging system for an electric bicycle, including a user terminal, a cloud platform server, and a plurality of dc charging piles, where the user terminal is in communication connection with the cloud platform server, and each dc charging pile is provided with a first NB-IOT communication module and is in communication connection with the cloud platform server through the first NB-IOT communication module;
the direct current charging pile is also provided with a control system, and the control system comprises a human-computer interaction module, a microprocessor, an electrode detection module, a power supply module and an electric energy output control module;
the human-computer interaction module is used for displaying charging information of the direct-current charging pile and receiving a charging instruction of the holder server, wherein the charging instruction is generated after the cloud platform server responds to a charging request of the user terminal;
the microprocessor is used for processing the operation data of the direct current charging pile so as to control the operation of the direct current charging pile;
it should be noted that, preferably, the main chip of the microprocessor adopts an FM33G048 chip of an ARM Cortex-M0 core, the microprocessor further specifically includes a large-capacity memory Flash chip and an EEPROM chip (M24256B), a 485 interface chip (ADM87E), a 232 interface chip (ADM202E), an electrical isolation chip (LTV816S), a power supply, a system clock, and the like, and a specific connection principle of the microprocessor is as shown in fig. 2, so that the microprocessor is used for processing the operation data of the dc charging pile to control the operation of the dc charging pile.
The electrode detection module is used for detecting the polarity of a storage battery connected with the direct current charging pile and adjusting the polarity of the output voltage of the direct current charging pile according to the polarity detection result;
it should be noted that, because electric bicycles in the current market have various brands, the charging interfaces and specifications of the storage batteries are not uniform, and the situation that the positive electrode and the negative electrode are connected in a wrong way easily occurs in the charging process, the damage of the charger and the storage battery can be caused, and even a fire accident can be caused. Therefore, this embodiment is through setting up polarity detection module for carry out automatic identification and detection to the polarity of battery, and adjust according to the testing result the direct current fills electric pile output voltage polarity, thereby has effectively improved the suitability that the direct current fills electric pile, the guarantee safety of charging.
As shown in fig. 3, a circuit structure diagram of the electrode detection module is shown, which includes relays K1 and K2, optical couplers U1 and U2, darlington tube Q1, diodes D1 and D3, resistors, capacitors, and the like. The + symbol represents a positive power output terminal, the-symbol represents a negative power output terminal, and the terminals a and B are connected to a charging terminal of the battery. When not having the battery, the electric pile is filled to the direct current does not have output voltage to guarantee safety, after inserting the battery, the polarity of electric pile automatic identification battery is filled to the direct current, and to battery output charging energy, can avoid damaging the battery, thereby reduced the possibility of damaging the battery, improved the life of battery. During the use, as long as will charge the interface access battery charge the jack can, and this embodiment can be applicable to the stake of charging of different voltage and electric current specifications.
The power supply module is used for providing a working power supply for the operation of the control system and providing dynamic output voltage and current for the charging of a storage battery; the power module adopts a self-adjusting three-stage charging method to charge the storage battery;
fig. 4 shows a block diagram of a power module in this example, and preferably, the power module employs a high-frequency switching power supply, and the switching power supply includes a main circuit, a control circuit, a protection circuit, and an auxiliary power supply.
Specifically, the main circuit comprises a phase-shifted full-bridge control circuit, and an output rectifying circuit of the phase-shifted full-bridge control circuit adopts a full-wave rectification mode; the phase-shifted full-bridge control circuit has the advantage of keeping the switching loss of the quasi-resonant circuit small, and works at a fixed switching frequency; the circuit adopts phase shift control, realizes zero voltage switching-on of a switching device by utilizing a resonance element during current conversion, reduces the switching-on loss of a power tube, improves the efficiency and enables the switching frequency to reach 50 KHZ-100 KHZ. The circuit structure is shown in fig. 5, wherein Tr is a high-frequency transformer, Ql-Q4 is a power tube, Dl-D4 is an internal parasitic diode of Q1-Q4, Cl-C4 is a sum of an internal parasitic capacitor and an external capacitor of Ql-Q4, and Lr resonant inductor includes leakage inductance of the transformer, two power tubes of each bridge arm form 180 degrees and are in complementary conduction, two power tubes on different diagonal lines of the bridge arm have a phase difference in turn-off time, the phase difference is a phase shift angle, and output voltage is adjusted by adjusting the size of the phase shift angle. In this embodiment, the leg composed of Q1 and Q3 is the leading leg, and the leg composed of Q2 and Q4 is the lagging leg.
Preferably, the output rectifying circuit of the phase-shifted full-bridge control circuit adopts a double half-wave rectifying mode formed by two fast recovery diodes, namely a full-wave rectifying mode. When the output voltage ratio is low and the output current ratio is high, a full-wave rectification mode is generally selected in order to reduce the on-state loss of the rectifier bridge and improve the efficiency of the converter. The specific circuit is shown in fig. 6. Wherein Tr is a high-frequency transformer, Lf is an output filter inductor, and C0Df is a rectifier diode for outputting a filter capacitor, and Cf and Rf form an RC absorption circuit.
Preferably, the specific parameters of the high-frequency transformer of the phase-shifted full-bridge control circuit are set as follows:
(1) voltage ratio
In order for the high frequency transformer to output a desired voltage within a predetermined input voltage range, the transformation ratio of the transformer should be selected in accordance with the lowest input voltage Vin. Considering the loss of the secondary duty ratio in the phase shift control, the present embodiment selects the maximum secondary duty ratio Dmax to be 0.85, and obtains the original secondary ratio:
where vo (max) is the maximum output voltage, VDFor outputting the on-state voltage drop of the rectifier diode, VLfIs the dc voltage drop across the output filter inductor.
(2) Selection of iron cores
After the voltage ratio is calculated, a suitable iron core can be selected according to the following formula:
wherein Ae is the cross-sectional area of the magnetic circuit of the iron core, Aw is the window area of the iron core, PTFor transmitting power to the transformer, fsFor the switching frequency,. DELTA.B is the maximum flux density transformation range allowed for the core material, dcIs the current density, k, of the transformer winding conductorcIs the fill factor of the windings in the core windows.
Wherein the transmission voltage V of the transformer in the circuitDR＝2Vin/n，PT1500W, switching frequency fs85KHZ, the core material is ferrite with Δ B of 0.2T and conductor current density dcSelecting 4A/mm2Window fill factor kcSelecting 0.5, and substituting the data into a formula to obtain
AeAw≥4.4×10-8m2；
According to the manual provided by ferrite core manufacturers, the core type is EE55, and the sectional area of the core is 3.53 multiplied by 10-4m2The window area is 2.80 multiplied by 10-4m2The requirements of the present embodiment can be satisfied.
(3) Number of turns of winding
After the core is selected, the number of turns of the winding can be calculated by:
and the data is substituted into the formula, so that the number of turns of the secondary winding of the transformer is 6.2, the actually selected number of turns is 7, and the primary winding of the transformer can be calculated to be 19 according to the transformation ratio of the transformer.
(4) Cross sectional area of winding wire
The sectional area A of the secondary winding wire can be calculated by the following formulac2：
Substituting data to obtain the sectional area A of the secondary winding wirec2Is 6.25mm2Obtaining the wire sectional area A of the primary winding according to the voltage ratioc2Is 2.27mm2. To reduce the skin effect of the wire, a multi-strand wire winding is generally used.
Preferably, the output filter inductor of the phase-shifted full-bridge control circuit is set as follows:
in a DC/DC full bridge converter, the primary voltage is transformed and rectified to be square wave voltage. Viewed from the output filter side, this circuit is similar to a BUCK converter, which operates at a frequency 2 times the switching frequency. Therefore, the output filter inductance and capacitance can be calculated according to the formula of the BUCK converter.
In order to ensure that the output filter inductor current is continuous at a certain minimum current, the minimum output current is set to be 1A, and then the output filter inductor can be calculated according to the following formula:
preferably, the output filter capacitor of the phase-shifted full-bridge control circuit is set as follows:
the selection of the output filter capacitor needs to consider not only the capacitance value, but also the Equivalent Series Resistance (ESR) and the withstand voltage value of the capacitor, and the output capacitor needs to have a sufficiently small ESR so as to meet the requirements of output ripple and load dynamic response; at the same time, the ESR must be sufficiently high to meet the stability requirements. The capacitance is also large enough to accommodate the need for absorbing the stored energy of the inductor during a full load to no load transition.
The calculation formula of the output filter capacitor is as follows:
let the peak value of AC ripple of output voltage be DeltaVOPPAnd (3) substituting the formula into 50mV to obtain:
the equivalent impedance of the capacitor is:
wherein:
Δ V is the effective value of the output voltage ripple, Δ IoppFor the peak value of the output current ripple, typically 20% of the output current nominal value, the parameters are substituted to obtain: xcLess than or equal to 0.135. By searching the handbook of electrolytic capacitors, four electrolytic capacitors with the capacity of 220uF/250V are selected for parallel use in the embodiment.
Preferably, the absorption circuit device of the phase-shifted full-bridge control circuit is arranged as follows: this example employs an RC snubber circuit whose parameters are calculated as follows:
the capacitance C of the buffer circuit can be obtained by the following formula
Wherein L is the main loopStray inductance, I is the drain current when the device is turned off, VCEPFor the steady-state value of the voltage of the buffer capacitor, EdIs a dc supply voltage.
The resistance of the buffer circuit is selected to discharge the accumulated charge of the buffer capacitor before the turn-off signal arrives according to the desired device, and can be estimated by the following formula:
if the buffer circuit resistance is too small, the current will fluctuate, and the initial value of the drain current when the device is turned on will increase, so on the premise of satisfying the above formula, it is desirable to select as large a resistance as possible, and the power consumption of the buffer resistor is independent of the resistance, and can be found by the following formula:
the absorption diode D must be a fast recovery diode with a rated current not less than 1/10 of the rated current of the main circuit device, and in addition, the line inductance should be minimized and an absorption capacitor with a small internal inductance should be used.
Based on the above analysis, the buffer circuit parameters can be selected as:
C＝1.1nF/400V；
R＝150Ω/5W。
preferably, the power devices of the phase-shifted full-bridge control circuit are set as follows:
the maximum value of the direct-current voltage after rectification and filtering is 358V, the rated voltage of a power switch tube is generally required to be two times higher than the direct-current bus voltage, the rated voltage of the power switch tube can be more than 700V, the maximum value of the output filtering inductive current is 27.5A, and the maximum value of the primary side current of a transformer is IP(MAX)When 27.5A/n is 27.5A/2.75 is 10A, which is also the maximum current in the power transistor, the power switch transistor with the rated current of 20A can be selected in consideration of the margin of 2 times.
By synthesizing the requirements on rated voltage and rated current, the power switch tube selects IXFX27N80Q, the drain-source voltage of the power switch tube is 800V, and the maximum current of the power switch tube is 27A.
The power module of this embodiment has a switching frequency of 85KHz, the output rectifier diode is a fast recovery diode, the secondary side of the transformer is a full-wave rectifier circuit, and the reverse voltage applied to the rectifier circuit is VDR＝2VinAnd/n (2 × 358)/2.75 ═ 260V. When the rectifier tube is switched on and off, certain voltage oscillation exists, a fast recovery diode with the withstand voltage higher than 520V can be selected in consideration of 2 times of allowance, and the maximum current flowing through the rectifier tube is 27.5A.
According to the voltage born in the reverse direction and the maximum current flowing, the fast recovery diode DSEI60-06C is selected, the reverse withstand voltage is 600V, the maximum current flowing is 60A, and the reverse recovery time is 35ns, which is relatively short.
The control circuit of the high-frequency switching power supply comprises a phase-shifting control chip UC3875, wherein the phase-shifting control chip UC3875 is provided with a power supply phase-shifting PWM control integrated circuit, and is used for performing mobile control on the phases of two half-bridge switching circuits, realizing constant-frequency PWM control of a half-bridge power stage, and completing zero-voltage switching-on under the state that the output capacitor is discharged by virtue of charging and discharging of an output capacitor of a switching device.
It should be noted that, when the phase shift control chip UC3875 performs phase control, 4 output column ends of the chip respectively drive the a/B half bridge and the C/D half bridge, both of which can perform adjustment control of conduction delay (i.e. dead time), and during the dead time, it is ensured that the output capacitor of the next conduction tube is discharged completely, and a zero-voltage turn-on condition is provided for the switching tube to be conducted.
Because the working frequency of the oscillator is more than 2MHz, the actual working frequency of the whole circuit can reach 2 MHz. The chip can work in a common mode, and can receive an external synchronous Clock signal through a Clock/Sync pin, and meanwhile, the external Clock frequency is greater than the chip frequency. When a plurality of UC3875 with different frequencies act together in the circuit, the UC3875 can synchronously work at the highest frequency through connecting pins.
The protection functions of the chip include: under-voltage locking, namely, before the bias voltage of the chip reaches a threshold value, four output ends of the chip can be kept in a low active output state; the built-in 1.5V lag ensures reliable work; with overcurrent protection, the protection circuit can shut down all output terminals within 70ns once a fault occurs, and fault handling can be restarted in a full cycle range. Other properties of the chip include: an error amplifier having a bandwidth in excess of 7 MHz; a reference voltage of 5V; soft starting; a slope compensation circuit for a ramp voltage generator.
Preferably, as shown in fig. 7, a wiring schematic diagram of the phase shift control chip UC3875 is shown, and the wiring principle specifically includes:
setting of switching frequency
The setting of FREQSET pin determines the magnitude of the switching frequency, and the calculation formula is as follows:
in the figure, R and C determine the frequency of the switching power supply module, the switching frequency is preset to be 85kHz in the present embodiment, and according to the formula, C is 1000pF, R is 47K, and f is 85 kHz.
② setting of dead time
The delay times of the output drive signal of UC3875 and the zero voltage switch are determined by R and C of the delay setting terminals (DELAY SETA-B, DELAY SETC-D), respectively. Two pairs of switch tubes of the super front arm and the lagging arm can be respectively arranged. The delay time is controlled by the resistance of the delay terminal to ground, and is given by the following equation:
wherein
Always 25uA or less than IDelay≤1mA；
In general, the delay voltage is 2.4V, and when a MOSFET is used as a power switch tube, the delay time can be set to several hundred ns, and in the present power supply, the dead time setting of the leading arm and the lagging arm is the same, and is set by a resistor R, and is set to a resistance value of 20K. C is 4700 pF. The 20K resistor can set the delay time to be 500ns, the power tube in the bridge circuit is IXFX27N80Q, the turn-off time is 75ns, sufficient time is provided for realizing soft switching, and the circuit cannot break down because two power tubes on the same bridge arm are in a conducting state at the same time. However, the dead time cannot be prolonged at one step, is too long, is difficult to realize by a soft switch, and must be reasonably selected.
And connecting Vref with an internal 5V precision reference voltage. When used as an output end, the current limiting circuit can provide 60mA current for an external circuit and has short-circuit current limiting protection. To obtain the best reference voltage, the equivalent series resistance and the capacitance of 0.1uF with small inductance should be between the Vref pin and GND pin.
The respective output terminals OUTA-OUTD are able to provide a 2A push-pull output current which enables optimum driving of the MOSFET gate. The four output ends are divided into two groups to alternately output signals, the maximum duty ratio is 50%, and the output ends A and B drive a half-bridge topology of an external bridge type conversion circuit and are synchronous with the clock waveform. The outputs C and D drive the other half-bridge, which has a certain switching phase shift from the a and B output signals.
Fifthly, sawtooth wave generation
A resistor R is connected between the SLOPE setting pin SLOPE and a certain power supply VxSLOPEProviding a current V to the sawtooth RAMPX/RSLOPEThe constant current source of (2). A capacitor C is connected between RAMP and signal groundRAMPThis determines the slope of the sawtooth waveform, typically in a voltage mode regulation mode, where Vx is tied directly to a 5V reference voltage. The slope of the ramp voltage is determined by:
RAMP is one input of the PWM comparator and the other input of the PWM comparator is the output of the error amplifier. In RAMP andthe input of the PWM comparator has a 1.3V offset between them, so that C is chosen appropriatelyRAMPAnd RSLOPEThe output voltage of the error amplifier does not exceed the amplitude of the sawtooth wave, and the maximum duty ratio is realized.
Vc power supply voltage of output stage switch tube and its bias circuit
A bypass capacitor with very small equivalent series resistance and inductance should be connected between this pin and the PWMGND pin.
In is the power supply voltage of logic and analog circuit in chip
The analog circuits and the logic circuits provide driving signals for the output switch tube. A bypass capacitor with very small equivalent series resistance and inductance should be connected between this pin and the GND pin.
V protective circuit arrangement
When the voltage of the C/S + end is higher than 2.5V, the current comparator outputs high level, the four output ends are completely blocked, and no energy is output. At the same time, the voltage of the soft start pin is pulled down to zero volts. When the voltage of the C/S + end is lower than 2.5V, the current comparator outputs low level, the soft start circuit works, and the phase shift angle of the output stage is gradually reduced from 180 degrees. In an actual circuit, the C/S + terminal can be used as a fault protection terminal, for example, detection signals of overvoltage, overcurrent, overheat and the like are output and are connected to the C/S + terminal through certain circuit conversion. When some fault occurs, the voltage of the C/S + end is higher than 2.5V, so that the circuit is protected.
Ninthly GND pin, all voltages using the potential of the GND pin as a base point
The timing capacitor connected to the frequency setting pin, the bypass capacitor connected to the reference voltage pin, the bypass capacitor connected to the input voltage pin, and the RAMP capacitor connected to the RAMP pin should all be directly connected to the ground line near the signal ground pin.
Pin R PWMGND, pin Vc should be connected to a bypass capacitor
The other end of the capacitor should be connected to the power line connected to the PWMGND pin. Any storage capacitor required in the circuit should be in parallel with this capacitor. The signal ground and power ground may also be connected together at some point in order to suppress noise and reduce dc voltage drop.
When Vin exceeds the undervoltage locking threshold, the capacitor is charged through the internal 9uA current source, and the voltage of the soft start pin is increased to about 4.8V. In the event of a current fault, the soft-start pin voltage will drop to a low potential and then rise to 4.8V. If a fault occurs during soft start, the outputs go low immediately and the soft start capacitor must be fully charged before the fault can be reset.
Preferably, in order to ensure that the switching power supply is not damaged under normal and abnormal use conditions of the switching power supply, the control circuit of the high-frequency switching power supply is further provided with a protection circuit.
As shown in fig. 8, a schematic diagram of a circuit structure of the protection circuit is shown, in which a current comparator in the UC3875 phase shift control chip is applied. The protection circuit of output current, output voltage, temperature, etc. is connected to the current detection end C/S + of UC3875 through certain circuit conversion, so as to realize the protection of the whole circuit.
And the electric energy output control module is used for controlling the on-off of the storage battery charging circuit according to the instruction of the microprocessor.
In a possible design, the control system further comprises a metering module, the metering module is provided with a communication interface, and sends real-time electric energy data in the operation process of the direct current charging pile to the microprocessor through the communication interface. Preferably, the core chip of the metering module adopts HLW8112, as shown in fig. 9, a schematic circuit diagram of the HLW8112 chip is shown, and details are not repeated here.
In one possible design, the control system further includes a transaction settlement module and a storage module;
the transaction settlement module is used for processing the charging transaction data of the user and transmitting the charging transaction data to the microprocessor, and providing an identity authentication management and third-party payment channel for the user terminal;
the storage module is used for storing the charging transaction data and the direct current charging pile operation parameters.
Preferably, as shown in fig. 10, a schematic circuit diagram of a 256Kb nonvolatile memory FM24C256A selected by the storage module is shown, where the chip is used to store setting parameters of the dc charging pile and a current device operating state, such as: the charging time and cost of the user and the current timing cost of the user for recovering the power failure.
In one possible design, the control system further comprises a voice module for reminding a user of the charging operation process and error alarm information.
In one possible design, when the power module charges the battery using a self-adjusting three-stage charging method, the power module is specifically configured to:
detecting whether the storage battery is overdischarged, if so, performing self-regulation activation charging on the storage battery by using the first constant current, and then boosting charging on the storage battery by using the second constant current when the voltage of the storage battery reaches a first voltage threshold value, otherwise, directly boosting charging on the storage battery by using the second constant current;
and when the voltage reaches a second voltage threshold value, directly charging the storage battery by using the first constant voltage, and when the voltage reaches a third voltage threshold value, charging the storage battery by using a floating charging mode.
In one possible design, the direct current charging pile is further provided with a safety protection system, and the safety protection system comprises an electric protection module, an emergency stop module and a control guide module;
the electric protection module is used for electric protection of the power input side of the direct current charging pile and electric isolation protection of power supply of the control system;
the emergency stop module is provided with an emergency stop button and is used for cutting off the output of the power supply module by using the emergency stop button when a fault occurs in the charging of the direct current charging pile;
the control and guide module is used for monitoring the charging interface of the direct current charging pile in real time, sending current maximum value data to the direct current charging pile and reading the saturation degree of the current charging storage battery.
In one possible design, the direct current charging pile is further provided with an operation management system, the operation management system comprises a second NB-IOT communication module, and data interaction is performed between the second NB-IOT communication module and the control system, so that transmission of consumption information of the direct current charging pile and monitoring of an operation state are achieved.
Preferably, in the embodiment, the first NB-IOT communication module and the second NB-IOT communication module are BC-95 communication modules, and the BC95 is a high-performance and low-power NB-IOT wireless communication module. The size of the module is only 19.9 multiplied by 23.6 multiplied by 2.2mm, the requirement of terminal equipment on small-size module products can be met to the maximum extent, and meanwhile, the module effectively helps users to reduce the product size and optimize the product cost. The BC95 is compatible with the M95 module of GSM/GPRS series of mobile communication in design, thereby facilitating the user to quickly and flexibly design and upgrade the product.
In one possible design, the cloud platform server provides a plurality of functional modules to the user terminal, the plurality of functional modules including at least: the system comprises a user management module, a direct current charging pile positioning module, a reserved charging module and a charging payment module.
The system comprises a user management module, a direct current charging pile positioning module, a reservation charging module and a charging payment module, wherein the user management module comprises user login registration, user homepage management, user personal center management, user electric pile using management and the like, the direct current charging pile positioning module is used for returning searched position information of the direct current charging pile to a user, the reservation charging module is used for responding to a user reservation charging request and generating a reservation order for the user, and the charging payment module is used for providing a charging payment channel for the user.
Based on the above disclosure, the cloud management of the shared direct current charging pile is realized through the NB-IOT network, so that a user can conveniently operate the direct current charging pile through a mobile terminal, and the user experience is good; the modularized detachable control system is arranged in the direct current charging pile, so that the direct current charging pile can be widely applied to various application scenes, and the installation and wiring are simple; a man-machine interaction module is arranged in a control system to display charging information of the direct current charging pile and receive a charging instruction of the holder server; the microprocessor is used for processing the operation data of the direct current charging pile so as to control the operation of the direct current charging pile; the electrode detection module is arranged to detect the polarity of a storage battery connected with the direct current charging pile, and the polarity of the output voltage of the direct current charging pile is adjusted according to the polarity detection result so as to avoid the storage battery from being damaged; the power supply module is arranged to charge the storage battery by adopting a self-adjusting three-stage charging method, so that the storage battery is prevented from being damaged by adopting large-current charging when the storage battery is overdischarged; through setting up electric energy output control module, can be according to microprocessor's instruction control battery charging circuit's break-make, avoid overcharging to lead to the overheated explosion accident of battery to take place.
As shown in fig. 11, in a second aspect, the present invention provides a method for operating an NB-IOT based intelligent charging system for electric bicycles, which includes but is not limited to steps S101 to S105:
s101, a user terminal sends a charging request to a cloud platform server, and the cloud platform server generates a charging instruction according to the charging request and sends the charging instruction to a direct current charging pile;
s102, after receiving the charging instruction, the direct current charging pile detects the polarity of a storage battery to be charged and adjusts the polarity of corresponding charging output voltage according to a polarity detection result;
s103, judging the voltage model of the storage battery to be charged, and outputting a PWM signal through a microprocessor to control a driving power supply module to configure the charging voltage of the storage battery with the corresponding model;
s104, charging the storage battery by adopting a self-adjusting three-stage charging method;
and S105, when the charging is finished or the charging is abnormal, the microprocessor sends an instruction to the electric energy output control module to control the on-off of the storage battery charging circuit.
As shown in fig. 12, as a practical application of the present embodiment, when the dc charging pile in the present embodiment is used to charge a 36V lead-acid battery, the working principle thereof includes:
firstly, whether the lead-acid storage battery is overdischarged or even damaged is judged, and if the detected voltage is lower than 30.6V, the lead-acid storage battery is judged to be damaged. When the voltage is between 30.6V and 32.4V, the storage battery is in an over-discharge state, charging is carried out in a self-regulation charging mode, and the pulse duty ratio is regulated, so that the equivalent charging voltage is about 36V; when the voltage of the storage battery is detected to reach 32.4V, the duty ratio of the charging pulse is increased, the reduced current is activated into a charging mode, and the equivalent charging voltage is about 50V until the voltage of the storage battery is detected to be 41.4V; at the moment, the pulse duty ratio is reduced, the boost charging mode is changed into a direct charging mode, the direct charging equivalent voltage is 46.8V, until the voltage of the storage battery terminal is detected to be 44.1V, the direct charging is finished, and the floating charging mode is entered; the float equivalent voltage is 41.4V. Wherein, the charging voltage value of each storage battery is obtained according to the charging characteristics of the lead-acid storage battery.
Of course, it can be understood that the dc charging pile in this embodiment may also charge a 48V lead-acid battery, and the working principle of the dc charging pile is the same as that of a 36V lead-acid battery, but the set threshold voltage is different, and details are not described here.
Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An NB-IOT-based intelligent charging system for an electric bicycle is characterized by comprising a user terminal, a cloud platform server and a plurality of direct current charging piles, wherein the user terminal is in communication connection with the cloud platform server, and each direct current charging pile is provided with a first NB-IOT communication module and is in communication connection with the cloud platform server through the first NB-IOT communication module;
the direct current charging pile is also provided with a control system, and the control system comprises a human-computer interaction module, a microprocessor, an electrode detection module, a power supply module and an electric energy output control module;
the human-computer interaction module is used for displaying charging information of the direct-current charging pile and receiving a charging instruction of the holder server, wherein the charging instruction is generated after the cloud platform server responds to a charging request of the user terminal;
the microprocessor is used for processing the operation data of the direct current charging pile and controlling the operation of the direct current charging pile;
the electrode detection module is used for detecting the polarity of a storage battery connected with the direct current charging pile and adjusting the polarity of the output voltage of the direct current charging pile according to the polarity detection result;
the power supply module is used for providing a working power supply for the operation of the human-computer interaction module, the microprocessor, the electrode detection module and the electric energy output control module and providing dynamic output voltage and current for charging a storage battery; the power module adopts a self-adjusting three-stage charging method to charge the storage battery;
and the electric energy output control module is used for controlling the on-off of the storage battery charging circuit according to the instruction of the microprocessor.
2. The NB-IOT based intelligent electric bicycle charging system according to claim 1, wherein the DC charging post is further provided with a safety protection system, the safety protection system comprises an electric protection module, an emergency stop module and a control guidance module;
the electric protection module is used for electric protection of the power input side of the direct current charging pile and electric isolation protection of power supply of the control system;
the emergency stop module is provided with an emergency stop button and is used for cutting off the output of the power supply module by using the emergency stop button when a fault occurs in the charging process of the direct current charging pile;
the control and guide module is used for monitoring the charging interface of the direct current charging pile in real time, sending current maximum value data to the direct current charging pile and reading the saturation degree of the current charging storage battery.
3. The NB-IOT based intelligent electric bicycle charging system according to claim 1, wherein the DC charging post is further provided with an operation management system, the operation management system comprises a second NB-IOT communication module, and data interaction is performed with the control system through the second NB-IOT communication module, so that transmission of consumption information of the DC charging post and monitoring of an operation state are realized.
4. The NB-IOT based intelligent electric bicycle charging system of claim 1, wherein the control system further comprises a metering module, the metering module is provided with a communication interface, and sends real-time electric energy data of the DC charging pile in the operation process to the microprocessor through the communication interface.
5. The NB-IOT based intelligent electric bicycle charging system according to claim 1, wherein the control system further comprises a transaction settlement module and a storage module;
the transaction settlement module is used for processing the charging transaction data of the user and transmitting the charging transaction data to the microprocessor, and providing an identity authentication management and third-party payment channel for the user terminal;
the storage module is used for storing the charging transaction data and the direct current charging pile operation parameters.
6. The NB-IOT based intelligent charging system for electric bicycles of claim 1, wherein the microprocessor is provided with an FM33G048 chip with ARM Cortex-M0 kernel.
7. The NB-IOT based intelligent electric bicycle charging system of claim 1, wherein the power module employs a high frequency switching power supply;
the main circuit of the high-frequency switching power supply comprises a phase-shifted full-bridge control circuit, and an output rectifying circuit of the phase-shifted full-bridge control circuit adopts a full-wave rectifying mode;
the control circuit of the high-frequency switching power supply comprises a phase-shifting control chip UC3875, wherein the phase-shifting control chip UC3875 is provided with a power supply phase-shifting PWM control integrated circuit, and is used for performing mobile control on the phases of two half-bridge switching circuits, realizing constant-frequency PWM control of a half-bridge power stage, and completing zero-voltage switching-on under the state that the output capacitor is discharged by virtue of charging and discharging of an output capacitor of a switching device.
8. The NB-IOT based intelligent charging system for electric bicycles as recited in claim 1, wherein when the power module charges the battery using a self-adjusting three-stage charging method, the power module is specifically configured to:
detecting whether the storage battery is overdischarged, if so, performing self-regulation activation charging on the storage battery by using the first constant current, and then boosting charging on the storage battery by using the second constant current when the voltage of the storage battery reaches a first voltage threshold value, otherwise, directly boosting charging on the storage battery by using the second constant current;
and when the voltage of the storage battery reaches a second voltage threshold value, directly charging the storage battery by using the first constant voltage, and when the voltage of the storage battery reaches a third voltage threshold value, charging the storage battery by using a floating charge mode.
9. The NB-IOT based intelligent electric bicycle charging system according to claim 1, wherein the cloud platform server provides a plurality of functional modules to the user terminal, the plurality of functional modules including at least: the system comprises a user management module, a direct current charging pile positioning module, a reserved charging module and a charging payment module.
10. An operating method of an NB-IOT based intelligent charging system for an electric bicycle is characterized by comprising the following steps:
the method comprises the steps that a user terminal sends a charging request to a cloud platform server, and the cloud platform server generates a charging instruction according to the charging request and sends the charging instruction to a direct current charging pile;
after receiving the charging instruction, the direct current charging pile detects the polarity of the storage battery to be charged and adjusts the polarity of the corresponding charging output voltage according to the polarity detection result;
judging the voltage model of the storage battery to be charged, and outputting a PWM signal through a microprocessor to control a driving power supply module to configure the charging voltage of the storage battery with the corresponding model;
a self-adjusting three-stage charging method is adopted to charge the storage battery;
when the charging is finished or the charging is abnormal, the microprocessor sends an instruction to the electric energy output control module to control the on-off of the storage battery charging circuit.
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| CN114290938A (en) * | 2021-12-29 | 2022-04-08 | 国网新疆电力有限公司经济技术研究院 | DC charging pile current error compensation method, system, device and readable storage medium |
| CN116853057A (en) * | 2023-08-04 | 2023-10-10 | 小米汽车科技有限公司 | Charging method, device, storage medium and vehicle |
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Application publication date: 20211224 |