Electric bicycle safety charging device and charging pile

Abstract

The utility model provides an electric bicycle safety charging device and a charging pile, in the electric bicycle safety charging device, a power supply end of a power-adjustable power supply is used for providing a charging power supply to the outside, and a current sampling end of the power-adjustable power supply is electrically connected with an input end of a current acquisition module; the control end of the controller is electrically connected with the output end of the power regulator; the output end of the current acquisition module is electrically connected with the input end of the core processor and the first input end of the proportional controller. The first output end of the core processor is electrically connected with the second input end of the proportional controller, and the second output end of the core processor is electrically connected with the first input end of the power regulator; and the output end of the proportional controller is electrically connected with the second input end of the power regulator, so that the current in the charging process can be calculated and controlled in real time, the stability of the charging current is kept, and the safety of the charging process of the electric bicycle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric bicycle charging, in particular to a safe charging device and a charging pile for an electric bicycle. Background Art

[0002] Driven by the goals of energy security and addressing climate change, reusable lithium batteries are recognized as a key driver of green energy transformation and an important component of electric bicycles, electric vehicles, and green energy storage devices. With the promotion of green travel, the use of electric bicycles is becoming more and more popular, and the charging piles they need have become more and more common equipment in public places such as communities, schools, and shopping malls. Among the energy sources of electric bicycles, lithium batteries are widely used due to their high energy density, and the safety of their charging is also tested. Accidents involving heating, spontaneous combustion, and explosions of lithium batteries, including electric vehicles, electric bicycles, and electrochemical energy storage power stations, have exposed the severity of battery safety issues. The resulting personal injuries and huge property losses have severely hit consumers and the market's confidence in battery products.

[0003] At present, centralized charging stations for electric bicycles generally have insufficient design carrying capacity and are unable to cope with the situation where a large number of electric bicycles are charging at the same time. There is no corresponding current warning design and safety protection mechanism during charging, and circuit overload and overheating are very likely to cause serious dangers such as fire.

[0004] Therefore, it is necessary to provide a technical solution for intelligently controlling current overload and adjusting the charging current in real time to improve the charging safety of electric bicycles. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a safe charging device and a charging pile for an electric bicycle.

[0006] The utility model solves the technical problem by adopting a technical solution: an electric bicycle safety charging device, comprising: an adjustable power supply, a current acquisition module, a core processor, a proportional controller, and a power regulator;

[0007] The power supply end of the adjustable power supply is used to provide external charging power, the current sampling end thereof is electrically connected to the input end of the current acquisition module, and the control end thereof is electrically connected to the output end of the power regulator;

[0008] The output end of the current acquisition module is electrically connected to the input end of the core processor and the first input end of the proportional controller respectively;

[0009] The first output terminal of the core processor is electrically connected to the second input terminal of the proportional controller, and the second output terminal of the core processor is electrically connected to the first input terminal of the power regulator;

[0010] The output end of the proportional controller is electrically connected to the second input end of the power regulator.

[0011] In a possible implementation, the current acquisition module uses a Hall element to implement current acquisition.

[0012] In a possible implementation, the proportional controller includes a calculation unit and a storage unit;

[0013] The data end of the computing unit is electrically connected to the data end of the storage unit;

[0014] The first input terminal, the second input terminal and the output terminal of the calculation unit are electrically connected to the output terminal of the current acquisition module, the first output terminal of the core processor and the second input terminal of the power regulator respectively.

[0015] The utility model also provides a charging pile, comprising the electric bicycle safety charging device as described above.

[0016] In a possible implementation, in the charging pile, the current collection module uses a Hall element to implement current collection.

[0017] In a possible implementation, in the charging pile, the proportional controller includes a calculation unit and a storage unit;

[0018] The data end of the computing unit is electrically connected to the data end of the storage unit;

[0019] The first input terminal, the second input terminal and the output terminal of the calculation unit are electrically connected to the output terminal of the current acquisition module, the first output terminal of the core processor and the second input terminal of the power regulator respectively.

[0020] Beneficial effects of the utility model:

[0021] By sampling the current during the charging process of the adjustable power supply, the core processor and the proportional controller can readjust the PWM signal output by the power regulator according to the current sampling result. The adjustable power supply can adjust the power under the PWM signal to maintain the stability of the charging current, thereby improving the safety of the electric bicycle charging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a safe charging device for an electric bicycle provided by an embodiment of the utility model;

[0023] Figure 2 This is a working flow chart of the electric bicycle safety charging device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0024] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0025] Please refer to Figure 1 , the embodiment disclosed in the present application relates to a technical solution: a safe charging device for an electric bicycle, comprising: an adjustable power supply, a current acquisition module, a core processor, a proportional controller, and a power regulator;

[0026] The power supply end of the adjustable power supply is used to provide external charging power, the current sampling end thereof is electrically connected to the input end of the current acquisition module, and the control end thereof is electrically connected to the output end of the power regulator;

[0027] The output end of the current acquisition module is electrically connected to the input end of the core processor and the first input end of the proportional controller respectively;

[0028] The first output terminal of the core processor is electrically connected to the second input terminal of the proportional controller, and the second output terminal of the core processor is electrically connected to the first input terminal of the power regulator;

[0029] The output end of the proportional controller is electrically connected to the second input end of the power regulator.

[0030] In this embodiment, the adjustable power supply provides energy for battery charging, and can adjust the output power (current) through PWM signals, thereby adjusting the size of the charging current, and a conventional model can be used. The current acquisition module is a conventional current acquisition module, and Hall elements can be used to collect the current currently charging the battery, and the collected current can be shaped and amplified to obtain the corresponding sampling signal value. The core processor can use a conventional embedded device, which has strong computing power and runs the corresponding algorithm, and is the control core of safe charging. The proportional controller adopts a conventional model, and the input content is the sampling signal value corresponding to the charging current. During operation, the current current is subtracted from the sampling signal value corresponding to the current at the previous moment to obtain a signed error value, and the output value is adjusted by the size and positive and negative of the error. When the error is large, the output signal is also large, and the positive and negative can be distinguished by the polarity of the output waveform. The power regulator adopts a conventional model, and the PWM signal can be output according to the size and polarity of the input waveform.

[0031] In a specific embodiment, Figure 2The electric bicycle is connected to an adjustable power supply through an electric bicycle charger. The adjustable power supply charges the battery of the electric bicycle. The charging power of the adjustable power supply is controlled by the PWM signal output by the power regulator. The current acquisition module performs current acquisition operation on the charging current through the Hall sensor, converts the current into the corresponding linearly transformed voltage value, and then obtains the corresponding sampling signal value after operations such as shaping, filtering, and amplification, and outputs the sampling signal value to the core processor and the proportional controller respectively. The core processor runs a charging current empirical model, fits the charging current empirical model with the input real-time value, obtains the current change trend, and converts it into a polarity signal to output to the proportional controller. The polarity model is an important parameter for predicting the charging current change trend. The core processor also performs conventional output control on the power regulator. The proportional controller receives the sampling signal value output from the current acquisition module and saves its value in real time in the internal memory. During operation, the current sampled current is subtracted from the current at the previous moment, that is, the sampling signal value, to obtain the signed error value, and the output value is adjusted according to the size and positive and negative of the error value and the polarity signal output by the core processor. The output value of the proportional controller is sent to the power regulator for fine-tuning. By adjusting the duty cycle of the power regulator PWM signal, the output power and charging size of the adjustable power supply are controlled. The power regulator adjusts the power under the conventional output control of the core processor and the fine-tuning control of the proportional controller, thereby outputting a PWM signal to control the charging power of the adjustable power supply.

[0032] It should be noted that the polarity signal output by the core processor can be used to control whether the output of the proportional controller is amplified or attenuated. For example, positive polarity indicates that the output of the proportional controller is amplified, while negative polarity indicates attenuation. The polarity signal output by the core processor is calculated by the current sampling signal, i.e., the sampling signal value, and the built-in empirical algorithm model. This model can be replaced according to different battery models. It is a calculation based on the empirical model. The front and rear current subtraction performed by the proportional controller itself is applicable to any connected battery. Both methods will obtain polarity signals and are superimposed inside the proportional controller. It can be considered that the polarity signal output by the core processor is based on the current trend control based on experience, which is a general direction. The polarity signal after the front and rear current subtraction of the proportional controller itself is real-time and is a relatively microscopic control.

[0033] It should be pointed out that the utility model proposes a device for adjusting the charging current change of electric bicycles by sampling, calculation, and feedback control. The charging current empirical model used on the core processor of the device can be replaced according to different battery models, which solves the problem that the charging current is unstable after the charging pile cannot be correctly matched due to different battery models of existing electric vehicles. At the same time, when the charging current empirical model uses a certain battery model, the proportional controller can automatically take over the control and use the current difference to stabilize the charging current, providing double insurance for the safe charging of electric bicycles.

[0034] In a possible implementation, the current acquisition module uses a Hall element to implement current acquisition.

[0035] In this embodiment, the Hall element may be a conventional Hall sensor.

[0036] In a possible implementation, the proportional controller includes a calculation unit and a storage unit;

[0037] The data end of the computing unit is electrically connected to the data end of the storage unit;

[0038] The first input terminal, the second input terminal and the output terminal of the calculation unit are electrically connected to the output terminal of the current acquisition module, the first output terminal of the core processor and the second input terminal of the power regulator respectively.

[0039] In this embodiment, the proportional controller is composed of a conventional computing unit and a storage unit, which is equivalent to a computing unit with a memory function. The input content is the sampled current, that is, the sampling signal value. During operation, the current current is subtracted from the sampling signal value of the current at the previous moment to obtain a signed error value. The output value is adjusted by the size and positive and negative of the error. When the error is large, the output signal is also large, and the positive and negative can be distinguished by the polarity of the output waveform.

[0040] The utility model also provides a charging pile, comprising the electric bicycle safety charging device as described above.

[0041] In a possible implementation, in the charging pile, the current collection module uses a Hall element to implement current collection.

[0042] In a possible implementation, in the charging pile, the proportional controller includes a calculation unit and a storage unit;

[0043] The data end of the computing unit is electrically connected to the data end of the storage unit;

[0044] The first input terminal, the second input terminal and the output terminal of the calculation unit are electrically connected to the output terminal of the current acquisition module, the first output terminal of the core processor and the second input terminal of the power regulator respectively.

[0045] The above embodiments should not limit the present invention in any way, and any technical solutions obtained by equivalent replacement or equivalent conversion shall fall within the protection scope of the present invention.

Claims

1. A safe charging device for electric bicycles, characterized in that: include: Adjustable power supply, current acquisition module, core processor, proportional controller, power regulator; The power supply end of the adjustable power supply is used to provide external charging power, the current sampling end thereof is electrically connected to the input end of the current acquisition module, and the control end thereof is electrically connected to the output end of the power regulator; The output end of the current acquisition module is electrically connected to the input end of the core processor and the first input end of the proportional controller respectively; The first output terminal of the core processor is electrically connected to the second input terminal of the proportional controller, and the second output terminal of the core processor is electrically connected to the first input terminal of the power regulator; The output end of the proportional controller is electrically connected to the second input end of the power regulator.

2. The electric bicycle safety charging device according to claim 1, characterized in that: The current acquisition module uses Hall elements to realize current acquisition.

3. The electric bicycle safety charging device according to claim 1, characterized in that: The proportional controller includes a calculation unit and a storage unit; The data end of the computing unit is electrically connected to the data end of the storage unit; The first input terminal, the second input terminal and the output terminal of the calculation unit are electrically connected to the output terminal of the current acquisition module, the first output terminal of the core processor and the second input terminal of the power regulator respectively.

4. A charging pile, characterized in that: It comprises the electric bicycle safety charging device as claimed in claim 1.

5. The charging pile according to claim 4, characterized in that: The current acquisition module uses Hall elements to realize current acquisition.

6. The charging pile according to claim 4, characterized in that: The proportional controller includes a calculation unit and a storage unit; The data end of the computing unit is electrically connected to the data end of the storage unit; The first input terminal, the second input terminal and the output terminal of the calculation unit are electrically connected to the output terminal of the current acquisition module, the first output terminal of the core processor and the second input terminal of the power regulator respectively.

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