Intelligent charging system for electric bicycle

Abstract

The utility model relates to an intelligent charging system for an electric bicycle. The intelligent charging system comprises a main control module, a multi-path charging unit, a composite detection module, a safety control module, a communication module and a cloud service platform, the multi-path charging unit comprises at least ten paths of independent charging loops, and each path is composed of a relay driving circuit, a charging socket, a state indicating lamp and an independent fuse; the composite detection module is integrated in each charging loop and comprises a current sensor, a temperature sensor and a voltage ripple detection circuit; the safety control module comprises a bleeder circuit connected with relay contacts in parallel and an encryption authentication unit connected with the input end of the charging socket; the main control module comprises a current waveform analysis circuit and is used for identifying the battery type through a charging current curve; through the system, multi-fault synchronous protection, hardware-level battery identification and independent fusing can be realized, early warning can be carried out on faults, single-path faults are not diffused, and the fuse replacement frequency is remarkably reduced.

Description

Technical Field

[0001] This utility model relates to the field of charging pile technology, and in particular to an intelligent charging system for electric bicycles. Background Technology

[0002] Charging stations are energy-saving devices that provide charging services for electric vehicles, electric bicycles, and other equipment. During use, electric bicycles often experience low or depleted battery power due to the limited battery capacity, causing inconvenience. Therefore, charging stations for electric bicycles are particularly important. Electric bicycle charging stations function similarly to gas pumps at gas stations. They can be fixed to the ground or walls and installed in public buildings, residential parking lots, or charging stations.

[0003] There are many brands of electric bicycle charging stations available, but some lack comprehensive safety features. Many electric bicycle chargers have poor warranty coverage or are used improperly, leading to short circuits. This results in repeated fuse blowouts and overloading of the charging stations. Repeated fuse blowouts require on-site replacement, increasing operating costs. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an intelligent charging system for electric bicycles, which can effectively solve the aforementioned problems.

[0005] To achieve the above requirements, the technical solution adopted by this utility model to solve its technical problem is as follows:

[0006] An intelligent charging system for electric bicycles is provided, including a main control module, a multi-channel charging unit, a composite detection module, a safety control module, a communication module, and a cloud service platform;

[0007] The multi-channel charging unit includes at least 10 independent charging circuits, each consisting of a relay drive circuit, a charging socket, a status indicator light, and an independent fuse.

[0008] The composite detection module is integrated into each charging circuit and includes a current sensor, a temperature sensor and a voltage ripple detection circuit.

[0009] The security control module includes a discharge circuit for parallel relay contacts and an encryption authentication unit connected to the input terminal of the charging socket;

[0010] The main control module includes a current waveform analysis circuit, which is used to identify the battery type by analyzing the charging current curve.

[0011] The intelligent charging system for electric bicycles described in this utility model includes a main control module connected to a PWM controller. The main control module achieves dynamic load balancing by adjusting the duty cycle of the relays. When the current in a single circuit exceeds a threshold A, the duty cycle of that circuit is reduced, while the duty cycle of the low-load circuit is increased.

[0012] The intelligent charging system for electric bicycles described in this utility model includes a voltage ripple detection circuit comprising a high-speed ADC sampling unit and a ripple coefficient calculation unit, wherein the ripple coefficient calculation unit is configured to perform calculations and output the results to the main control module.

[0013] The intelligent charging system for electric bicycles described in this utility model includes an encryption authentication unit containing a security chip programmed to execute a charger handshake protocol.

[0014] The intelligent charging system for electric bicycles according to this utility model includes a discharge circuit comprising:

[0015] TVS diodes in parallel relay contacts;

[0016] An energy recovery unit, comprising a rectifier bridge and an inverter, is used to feed the induced electromotive force back to the power grid.

[0017] The intelligent charging system for electric bicycles according to this utility model includes a communication module comprising:

[0018] The 4G / WiFi wireless unit has its antenna integrated into the edge of the PCB board.

[0019] The power line carrier PLC unit includes a coupling transformer and a carrier frequency adaptive circuit.

[0020] The intelligent charging system for electric bicycles according to this utility model includes a main control module connected to a graded protection circuit, which comprises:

[0021] Overcurrent lockout module, response lasting longer than 10ms with a current greater than 50A;

[0022] The pulse attempt module, consisting of a timer chip and a current comparator, is used to trigger three power supply attempts with a 5-second interval.

[0023] The electric bicycle intelligent charging system of this utility model includes a voice warning module, whose storage chip pre-stores multilingual audio files, and the voice content is updated by scanning a QR code on the device.

[0024] The intelligent charging system for electric bicycles according to this utility model includes a current waveform analysis circuit comprising:

[0025] Differential amplifier circuit is used to obtain the second derivative signal of current;

[0026] The voltage comparator compares the differential signal with the characteristic threshold of a lead-acid / lithium battery.

[0027] The beneficial effects of this utility model are as follows:

[0028] 1. It can achieve multi-fault synchronous protection, and realize early warning of overload, overheating and deterioration of the charger through triple detection of current, temperature and ripple;

[0029] 2. It can also realize hardware-level battery identification. The current waveform analysis circuit can directly distinguish between lead-acid and lithium batteries, avoid cloud delay, and improve the response speed of charging strategy.

[0030] 3. It can also achieve independent fuse breaking, preventing single-circuit faults from spreading and reducing the frequency of fuse replacement. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the overall circuit principle of this utility model.

[0033] Figure 2 This is a schematic diagram of the voltage ripple detection circuit of this utility model.

[0034] Figure 3 This is a schematic diagram of the discharge circuit principle of this utility model.

[0035] Figure 4 This is a schematic diagram of the current waveform analysis circuit of this utility model. Detailed Implementation

[0036] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0037] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0039] Furthermore, the terms indicating orientation, such as "up," "down," "left," "right," "upper end," "lower end," and "longitudinal," are all based on the posture and position of the device or equipment described in this solution during normal use.

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are some, but not all, embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0041] The preferred embodiment of this utility model is an intelligent charging system for electric bicycles, such as... Figure 1-4 As shown, it includes a main control module 1, a multi-channel charging unit 2, a composite detection module 3, a safety control module 4, a communication module 5, and a cloud service platform 6;

[0042] The multi-channel charging unit 2 contains at least 10 independent charging circuits, each consisting of a relay drive circuit, a charging socket, a status indicator light, and an independent fuse.

[0043] The composite detection module 3 is integrated into each charging circuit and includes a current sensor 31, a temperature sensor 32 and a voltage ripple detection circuit 33.

[0044] The safety control module 4 includes a discharge circuit 41 with parallel relay contacts and an encryption authentication unit connected to the input terminal of the charging socket;

[0045] The main control module 1 includes a current waveform analysis circuit 11, which is used to identify the battery type through the charging current curve.

[0046] This system enables simultaneous protection against multiple faults. It provides early warnings for overload, overheating, and deteriorated chargers through triple detection of current, temperature, and ripple. It also enables hardware-level battery identification, with the current waveform analysis circuit directly distinguishing between lead-acid and lithium batteries, avoiding cloud delays and improving the response speed of charging strategies. Furthermore, it enables independent fuse breaking, preventing single-path faults from spreading and reducing the frequency of fuse replacements.

[0047] In this embodiment, the main control module 1 is connected to the PWM controller 12. Dynamic load balancing is achieved by adjusting the duty cycle of the relay. When the current of a single circuit exceeds the threshold A, the duty cycle of that circuit is reduced, while the duty cycle of the low-load circuit is increased. Through real-time duty cycle adjustment, the number of vehicles that a single pile can serve is increased. Moreover, more devices can be connected under the original line capacity, saving cable modification costs.

[0048] In this embodiment, the voltage ripple detection circuit 33 includes a high-speed ADC sampling unit 331 and a ripple coefficient calculation unit 332. The ripple coefficient calculation unit is configured to perform calculations and output the results to the main control module. The formula for calculating the ripple coefficient is K. r =(V PP / V avg K in the formula is 100% * 100%. r V is the ripple factor, characterizing the severity of voltage fluctuations. PP V represents the peak-to-peak voltage value, which is the voltage difference between the highest and lowest points of the waveform. avg The voltage average is the arithmetic mean of the voltage over one cycle. In actual operation, when the internal capacitors of the charger malfunction or age, their filtering capability decreases, leading to a drop in voltage (V). pp Increase, thus making K r The value increases, therefore, it can be controlled by a preset threshold K. r To trigger fault diagnosis.

[0049] In this embodiment, the encryption authentication unit includes a security chip that is programmed to execute the charger handshake protocol. Hardware encryption authentication can prevent unauthenticated chargers from accessing the network, reducing short-circuit accidents, while the security chip stores keys to prevent network cracking.

[0050] In this embodiment, the discharge circuit 41 includes:

[0051] TVS diode 411 is used in parallel relay contacts to absorb arc energy and reduce contact loss;

[0052] The energy recovery unit 412 includes a rectifier bridge 4121 and an inverter 4122, which is used to feed the induced electromotive force back to the power grid, thereby saving power and preventing arcing from causing fire hazards.

[0053] In this embodiment, the communication module 5 includes:

[0054] The 4G / WiFi wireless unit 51 integrates its antenna on the edge of the PCB board, eliminating the need for a dedicated communication cable and reducing installation costs;

[0055] The power line carrier PLC unit 52 includes a coupling transformer and a carrier frequency adaptive circuit to avoid power grid harmonics.

[0056] In this embodiment, the main control module 1 is connected to the graded protection circuit 13, which includes:

[0057] Overcurrent lockout module, response lasting longer than 10ms with a current greater than 50A;

[0058] The pulse attempt module, consisting of a timer chip and a current comparator, is used to trigger three power supply attempts with a 5-second interval. The pulse attempt automatically recovers from intermittent faults, reducing the need for on-site reset.

[0059] In this embodiment, the system includes a voice alert module, which has multilingual audio files pre-stored in its storage chip. The voice content is updated by scanning a QR code on the device. The remote update of the voice content via QR code can reduce maintenance costs and provide users with different fault playback content.

[0060] In this embodiment, the current waveform analysis circuit includes:

[0061] Differential amplifier circuit 111 is used to obtain the second derivative signal of the current to achieve a fast response, which is faster than the software response method and improves the user experience.

[0062] The voltage comparator 112 compares the differential signal with the characteristic threshold of lead-acid / lithium batteries, automatically adapts to the battery type, corrects user operation errors, and prevents overcharging for lead-acid batteries and undercharging for lithium batteries, thus protecting the user's battery life.

[0063] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. An electric bicycle intelligent charging system, characterized in that, It includes a main control module, a multi-channel charging unit, a composite detection module, a safety control module, a communication module, and a cloud service platform; The multi-channel charging unit includes at least 10 independent charging circuits, each consisting of a relay drive circuit, a charging socket, a status indicator light, and an independent fuse. The composite detection module is integrated into each charging circuit and includes a current sensor, a temperature sensor and a voltage ripple detection circuit. The security control module includes a discharge circuit for parallel relay contacts and an encryption authentication unit connected to the input terminal of the charging socket; The main control module includes a current waveform analysis circuit, which is used to identify the battery type by analyzing the charging current curve.

2. The intelligent charging system for electric bicycles according to claim 1, characterized in that, The main control module is connected to the PWM controller and achieves dynamic load balancing by adjusting the duty cycle of the relays. When the current of a single circuit exceeds the threshold A, the duty cycle of that circuit is reduced, while the duty cycle of the low-load circuit is increased.

3. The electric bicycle intelligent charging system of claim 1, wherein, The voltage ripple detection circuit includes a high-speed ADC sampling unit and a ripple coefficient calculation unit. The ripple coefficient calculation unit is configured to perform calculations and output the results to the main control module.

4. The electric bicycle intelligent charging system of claim 1, wherein, The encryption authentication unit includes a security chip programmed to perform a charger handshake protocol.

5. The electric bicycle intelligent charging system of claim 1, wherein, The discharge circuit includes: TVS diodes in parallel relay contacts; An energy recovery unit, comprising a rectifier bridge and an inverter, is used to feed the induced electromotive force back to the power grid.

6. The electric bicycle intelligent charging system of claim 1, wherein, The communication module includes: The 4G / WiFi wireless unit has its antenna integrated into the edge of the PCB board. The power line carrier PLC unit includes a coupling transformer and a carrier frequency adaptive circuit.

7. The electric bicycle intelligent charging system of claim 1, wherein, The main control module is connected to a hierarchical protection circuit, which includes: Overcurrent lockout module, response lasting longer than 10ms with a current greater than 50A; The pulse attempt module, consisting of a timer chip and a current comparator, is used to trigger three power supply attempts with a 5-second interval.

8. The electric bicycle intelligent charging system of claim 1, wherein, The system includes a voice alert module, whose storage chip pre-stores multilingual audio files, and the voice content is updated by scanning a QR code on the device.

9. The electric bicycle intelligent charging system of claim 1, wherein, The current waveform analysis circuit includes: Differential amplifier circuit is used to obtain the second derivative signal of current; The voltage comparator compares the differential signal with the characteristic threshold of a lead-acid / lithium battery.

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