A step-up constant current charger

Abstract

The application relates to a step-up constant-current charger, which comprises a signal acquisition module, a main power supply step-up module and an MCU control module, the signal acquisition module is used for collecting the riding state parameters of a leisure scooter in real time, the main power supply step-up module is used for stepping up the three-phase alternating current generated by a pedal generator of the leisure scooter to a preset charging voltage, the main power supply step-up module comprises a main control chip U1 and a constant-current loop, the constant-current loop is electrically connected with the main control chip U1 and is used for controlling the main power supply step-up module to perform constant-current output, the MCU control module can judge whether the riding state parameters meet the charging condition, and controls the main power supply step-up module to charge the battery pack when the charging condition is met. The low-voltage input problem is solved through the setting of the main power supply step-up module, and the charging current of the charger is controlled through the setting of the constant-current loop, the pedal has good smoothness, and the user experience is improved.

Description

Technical Field

[0001] This invention relates to the field of charging control technology, and in particular to a boost constant current charger. Background Technology

[0002] With the popularization of healthy living concepts, recreational bicycles with power generation functions are attracting more and more attention, such as senior fitness tricycles and exercise bikes. Users convert mechanical energy into electrical energy by pedaling, which charges the battery of the recreational bicycle and meets their needs for leisure, fitness and entertainment.

[0003] Traditional chargers are typically designed for stable AC power with a voltage higher than the battery voltage. However, the generators in recreational bicycles output unstable, low-voltage three-phase AC power, often lower than the battery pack voltage, making traditional step-down chargers inadequate. Furthermore, because batteries are inherently capacitive loads, their voltage cannot change abruptly, resulting in a very high current absorption capacity. If the charging current is not limited during riding, the extremely high instantaneous charging current will lead to extremely high instantaneous power, causing the user to experience unusually heavy pedaling resistance, affecting pedaling smoothness and resulting in a poor user experience. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned in the background art and to provide a boost constant current charger.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A boost constant current charger, the charger comprising:

[0007] The signal acquisition module is used to collect the riding status parameters of the recreational bicycle in real time.

[0008] The main power boost module is used to boost the three-phase AC power generated by the pedal generator of the recreational bicycle to a preset charging voltage to charge the battery pack of the recreational bicycle; the main power boost module includes a main control chip U1 and a constant current ring, the constant current ring is electrically connected to the main control chip U1, and is used to control the main power boost module to perform constant current output;

[0009] The MCU control module is electrically connected to the signal acquisition module and the main power boost module respectively. The MCU control module can determine whether the riding status parameters meet the charging conditions, and control the main power boost module to charge the battery pack when the charging conditions are met.

[0010] In one embodiment, the riding status parameters include the pedal frequency of the recreational bicycle and the direction of the pedal generator. When the pedal generator is rotating forward and the pedal frequency is higher than a preset pedal frequency threshold, the MCU control module controls the main power boost module to charge the battery pack.

[0011] In one embodiment, the constant current loop includes a detection unit and a comparator chip U4; the detection unit is connected to the comparator chip U4 and is used to acquire a detection voltage value and input the detection voltage value to pin 2 of the comparator chip U4;

[0012] The comparator chip U4 has a preset voltage value input at pin 3. The comparator chip U4 is used to compare the detected voltage value with the preset voltage value, and control the output terminal of the main power boost module to output a constant current based on the comparison result.

[0013] In one embodiment, the constant current loop includes resistors R36, R34-1, and R8, wherein the current value at the output terminal of the main power boost module is R36 / (R36+(R34-1))*3.3 / R8.

[0014] In one embodiment, the constant current loop further includes a multi-level adjustment circuit, which is connected to the MCU control module. The multi-level adjustment circuit includes multiple resistors connected in parallel. One end of each of the multiple resistors connected in parallel is connected to pin 3 of the comparator chip U4, and the other end is connected to the corresponding pin of the main control chip U5 in the MCU control module. The main control chip U5 controls the on / off state of the corresponding resistor branch according to the level signal fed back by the multi-level adjustment circuit.

[0015] In one embodiment, the charger further includes an input voltage acquisition circuit, which is connected to the MCU control module and is used to acquire the voltage value at the input terminal of the main power boost module;

[0016] The MCU control module can receive feedback signals from the input voltage acquisition circuit and control the switching of MOS transistor Q7 through pin 5 of its main control chip U5 and the back-end circuit of the main power boost module to control whether the charger is charging.

[0017] In one embodiment, the charger further includes an output voltage acquisition circuit connected to the MCU control module. The output voltage acquisition circuit is used to acquire the voltage at the output terminal of the main power boost module and feed it back to the MCU control module so that the MCU control module can monitor the operating status of the main power boost module.

[0018] In one embodiment, the charger further includes a power supply module, which is connected to both the battery pack and the main power boost module, and is used to convert the voltage of the battery pack into the operating voltage required by the main power boost module.

[0019] In one embodiment, the charger further includes a secondary voltage conversion module connected to the MCU control module for supplying power to the MCU control module.

[0020] Effects of the invention:

[0021] This invention claims a boost constant current charger that solves the low-voltage input problem by setting up a main power boost module and controls the charging current of the charger by setting up a constant current loop, thereby achieving smooth charging intervention and preventing the battery from drawing too much current as a capacitive load, which would cause the pedal to become heavy. The pedal has good smoothness and improves the user experience. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a circuit diagram of an MCU control module provided in an embodiment of the present invention;

[0024] Figure 2 A circuit diagram of a main power supply boost module with a constant current loop provided in an embodiment of the present invention;

[0025] Figure 3 This is a tread frequency Hall signal acquisition circuit provided in an embodiment of the present invention;

[0026] Figure 4 This is a Hall signal acquisition circuit for a pedal generator provided in an embodiment of the present invention;

[0027] Figure 5 The input voltage acquisition circuit and output voltage acquisition circuit provided in one embodiment of the present invention;

[0028] Figure 6 The circuit diagram is provided for a power supply module according to an embodiment of the present invention;

[0029] Figure 7 This is a circuit diagram of a two-stage voltage conversion module provided in an embodiment of the present invention.

[0030] Figure reference numerals: 10, constant current ring; 11, detection unit; 12, multi-level adjustment circuit; 20, back-end circuit. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] This invention claims the protection of a charger and charging control system for use on recreational bicycles, such as senior citizen exercise tricycles and exercise bikes.

[0033] Please see Figures 1 to 4 An embodiment of the present invention provides a boost constant current charger, including a signal acquisition module, a main power boost module, and an MCU control module. The signal acquisition module is used to acquire the riding status parameters of a recreational bicycle in real time. The main power boost module is used to boost the three-phase AC power generated by the pedal generator of the recreational bicycle to a preset charging voltage to charge the battery pack of the recreational bicycle.

[0034] like Figure 2 As shown, the main power boost module includes a main control chip U1 and a constant current loop 10. The constant current loop 10 is electrically connected to pin 7 of the main control chip U1 and is used to control the main power boost module to output a constant current. The MCU control module is electrically connected to both the signal acquisition module and the main power boost module. The MCU control module can determine whether the riding status parameters meet the charging conditions, and when the charging conditions are met, it controls the main power boost module to charge the battery pack. In this way, by setting the main power boost module to solve the low voltage input problem, and by setting the constant current loop 10 to control the charging current of the charger, a smooth charging intervention is achieved, preventing the battery from absorbing excessive current as a capacitive load, which would cause the pedals to feel heavy. This results in smoother pedaling and a better user experience.

[0035] Specifically, the three-phase AC power converted by the foot-operated generator is rectified and filtered, and then used as the input voltage of the main power boost module. This input voltage is unstable, ranging from 0V to 60V. The output terminal of the main power boost module is connected to the positive terminal of the battery pack.

[0036] For example, the battery pack includes four batteries connected in series, with each battery having a full-charge voltage of approximately 14V. Calculations show that the preset charging voltage is 56V. Of course, in other embodiments, the battery pack voltage can be designed to other values, and the preset charging voltage can also be adjusted according to the battery pack.

[0037] like Figure 3 and Figure 4 As shown, the signal acquisition module includes a pedal generator Hall signal acquisition circuit and a pedal frequency Hall signal acquisition circuit.

[0038] In this embodiment, the riding status parameters include the pedaling frequency of the recreational bicycle and the direction of the pedal generator. When the pedal generator is rotating forward and the pedaling frequency is higher than a preset pedaling frequency threshold, the MCU control module controls the main power boost module to charge the battery pack. This ensures that charging is only initiated when riding in the correct direction and reaching a certain pedaling frequency, intervening at the optimal time to avoid pedaling heaviness and optimize the user experience.

[0039] As is understandable, when a user rides forward, they pedal the pedals of a recreational bicycle. The pedals drive the pedal generator via the chain, and the higher the pedaling frequency, the higher the generator's speed. Conversely, if the user rides in the opposite direction, the pedals rotate in the opposite direction, and the chain spins freely, unable to drive the pedal generator. Therefore, charging only begins when the pedal generator is rotating forward. Furthermore, if a load is applied at the beginning of charging, the instantaneous current will be extremely high, making it difficult for the user to pedal and causing the pedals to feel heavy. Therefore, a load is only applied to charge when the pedaling frequency exceeds a preset threshold. In other words, charging only begins when the pedaling frequency reaches a certain level, ensuring a smooth ride and a superior user experience.

[0040] like Figure 2 As shown, in this embodiment, the constant current loop 10 includes a detection unit 11 and a comparator chip U4. The detection unit 11 is connected to the comparator chip U4 and is used to acquire the detection voltage value and input the detection voltage value to pin 2 of the comparator chip U4. The current from the output of the main power supply boost module passes through resistor R8, causing a voltage difference across resistor R8. One end of resistor R8 is grounded, and the voltage value at the other end is the detection voltage value.

[0041] The comparator chip U4 has a preset voltage value at pin 3. The comparator chip U4 is used to compare the detected voltage value with the preset voltage value and control the output of the main power boost module to output a constant current based on the comparison result.

[0042] Specifically, comparator chip U4 is a dual operational amplifier integrated circuit chip. Detection unit 11 obtains the detected voltage value by detecting the voltage across the current sensing resistor, and inputs this detected voltage value to pin 2 of comparator chip U4. A preset voltage value is input to pin 3 of comparator chip U4. Comparator chip U4 controls the level change of pin 1, thereby changing the input value of pin 7 of the main control chip U1 of the main power boost module, thus controlling the output of the main power boost module to output a constant current, ensuring the charging current remains stable and guaranteeing a smooth ride.

[0043] Furthermore, the constant current loop 10 includes resistors R36, R34-1, and R8, wherein the current value at the output terminal of the main power boost module is R36 / (R36+(R34-1))*3.3 / R8.

[0044] In this embodiment, the constant current loop 10 further includes a multi-level adjustment circuit 12, which is connected to the MCU control module. The multi-level adjustment circuit 12 includes multiple resistors connected in parallel. One end of each resistor is connected to pin 3 of the comparator chip U4, and the other end is connected to the corresponding pin of the main control chip U5 in the MCU control module. The main control chip U5 receives the level signal provided by the multi-level adjustment circuit 12 and controls the on / off state of the corresponding resistor branch according to the level signal to adjust the voltage value, thereby providing a controllable preset voltage value to pin 3 of the comparator chip U4 so that the constant current loop 10 can perform constant current output.

[0045] Specifically, such as Figure 2 As shown, the multi-level adjustment circuit 12 includes resistors R34-3, R34-4, R34-5, R34-6, and R34-7 connected in parallel. Figure 1 As shown, the V1 terminal of the main control chip U5 is connected to resistor R34-7; the V2 terminal of the main control chip U5 is connected to resistor R34-6; the V3 terminal of the main control chip U5 is connected to resistor R34-5; the V4 terminal of the main control chip U5 is connected to resistor R34-4; and the V5 terminal of the main control chip U5 is connected to resistor R34-3. The connection pins between the main control chip U5 and multiple parallel resistors are active high. Whether the MCU pin is set to high determines the reference voltage. When resistor R34-3 is high, the reference voltage is R35 / (R34-3+R35); when resistor R34-4 is high, the reference voltage is R35 / (R34-4+R35); when resistor R34-5 is high, the reference voltage is R35 / (R34-5+R35); when resistor R34-6 is high, the reference voltage is R35 / (R34-6+R35); when resistor R34-7 is high, the reference voltage is R35 / (R34-7+R35).

[0046] like Figure 5As shown, in this embodiment, the charger also includes an input voltage acquisition circuit, which is connected to the MCU control module and is used to acquire the voltage value at the input terminal of the main power boost module. The MCU control module can receive the feedback signal from the input voltage acquisition circuit and control the switching of the MOS transistor Q7 through pin 5 of its main control chip U5 and the back-end circuit 20 of the main power boost module to control whether the charger is charging.

[0047] like Figure 2 As shown, specifically, the back-end circuit 20 of the main power boost module is located between Vout-key and MOSFET Q7. The MCU control module is connected to the Vout-key position in the main power boost module via the Vout-key pin. When the voltage value acquired by the input voltage acquisition circuit exceeds 60V, the main power boost module is inactive; that is, the main power boost module is directly connected, and the input voltage value is the same as the output voltage value. Because the input voltage is unstable and may exceed 60V, it is necessary to acquire the input voltage. If the voltage acquired by the input voltage acquisition circuit is less than the battery pack voltage, MOSFET Q7 is turned on to start charging; if the voltage acquired by the input voltage acquisition circuit is greater than the battery pack voltage, MOSFET Q7 is turned off to stop charging.

[0048] like Figure 5 As shown, in this embodiment, the charger also includes an output voltage acquisition circuit, which is connected to the MCU control module. This circuit acquires the voltage at the output terminal of the main power boost module and feeds it back to the MCU control module, enabling the MCU control module to monitor the operating status of the main power boost module. This allows the MCU control module to diagnose whether the charging circuit is working properly, enhancing the maintainability and safety of the charger.

[0049] like Figure 6 As shown, in this embodiment, the charger also includes a power supply module, which is connected to the battery pack and the main power boost module respectively, and is used to convert the voltage of the battery pack into the operating voltage required by the main power boost module.

[0050] like Figure 7 As shown, in this embodiment, the charger also includes a secondary voltage conversion module, which is connected to the MCU control module and is used to supply power to the MCU control module.

[0051] For example, the battery pack consists of four 12V single cells, with a total battery pack voltage of 48V. The power supply module converts this battery pack voltage to 12V to power the main power boost module. A secondary voltage conversion module converts the 12V voltage to 5V to provide the required operating voltage for the MCU control module.

[0052] This invention also provides a charging control system for use on a recreational bicycle. The charging control system includes a pedal generator, a battery pack, sensor components, and the aforementioned charger. The charger is connected to both the pedal generator and the battery pack. The charger selectively uses the energy generated by the pedal generator for power generation or not, and charges the battery pack when charging conditions are met. The charger includes a PCB board, on which a signal acquisition module, a main power boost module, a constant current control circuit, and an MCU control module are all mounted. The signal acquisition module is connected to the sensor components.

[0053] The sensor assembly includes a cadence sensor and a pedal generator signal sensor. The cadence sensor is connected to a cadence Hall effect signal acquisition circuit, which acquires the cadence Hall effect signal through the cadence sensor and feeds it back to the MCU control module. The pedal generator signal sensor is connected to a pedal generator Hall effect signal acquisition circuit, which acquires the pedal generator Hall effect signal through the cadence sensor and feeds it back to the MCU control module. The MCU control module determines whether to charge based on the received signals.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A boost constant current charger, used in recreational bicycles, characterized in that, The charger includes: The signal acquisition module is used to collect the riding status parameters of the recreational bicycle in real time. The main power boost module is used to boost the three-phase AC power generated by the pedal generator of the recreational bicycle to a preset charging voltage to charge the battery pack of the recreational bicycle; the main power boost module includes a main control chip U1 and a constant current ring, the constant current ring is electrically connected to the main control chip U1, and is used to control the main power boost module to perform constant current output; The MCU control module is electrically connected to the signal acquisition module and the main power boost module respectively. The MCU control module can determine whether the riding status parameters meet the charging conditions, and control the main power boost module to charge the battery pack when the charging conditions are met. The riding status parameters include the pedal frequency of the leisure bicycle and the direction of the pedal generator. When the pedal generator is rotating forward and the pedal frequency is higher than a preset pedal frequency threshold, the MCU control module controls the main power boost module to charge the battery pack.

2. The boost constant current charger according to claim 1, characterized in that, The constant current loop includes a detection unit and a comparator chip U4; the detection unit is connected to the comparator chip U4 and is used to acquire the detection voltage value and input the detection voltage value to pin 2 of the comparator chip U4. The comparator chip U4 has a preset voltage value input at pin 3. The comparator chip U4 is used to compare the detected voltage value with the preset voltage value, and control the output terminal of the main power boost module to output a constant current based on the comparison result.

3. The boost constant current charger according to claim 1, characterized in that, The constant current loop includes resistors R36, R34-1, and R8, wherein the current value at the output terminal of the main power boost module is R36 / (R36+(R34-1))*3.3 / R8.

4. The boost constant current charger according to claim 2, characterized in that, The constant current loop also includes a multi-level adjustment circuit, which is connected to the MCU control module. The multi-level adjustment circuit includes multiple resistors connected in parallel. One end of each of the multiple resistors connected in parallel is connected to pin 3 of the comparator chip U4, and the other end is connected to the corresponding pin of the main control chip U5 in the MCU control module. The main control chip U5 controls the on / off state of the corresponding resistor branch according to the level signal fed back by the multi-level adjustment circuit.

5. The boost constant current charger according to claim 2, characterized in that, The charger also includes an input voltage acquisition circuit, which is connected to the MCU control module and is used to acquire the voltage value at the input terminal of the main power boost module. The MCU control module can receive feedback signals from the input voltage acquisition circuit and control the switching of MOS transistor Q7 through pin 5 of its main control chip U5 and the back-end circuit of the main power boost module to control whether the charger is charging.

6. The boost constant current charger according to claim 2, characterized in that, The charger also includes an output voltage acquisition circuit, which is connected to the MCU control module and is used to acquire the voltage at the output terminal of the main power boost module and feed it back to the MCU control module so that the MCU control module can monitor the working status of the main power boost module.

7. The boost constant current charger according to claim 1, characterized in that, The charger also includes a power supply module, which is connected to the battery pack and the main power boost module respectively, and is used to convert the voltage of the battery pack into the operating voltage required by the main power boost module.

8. The boost constant current charger according to claim 1, characterized in that, The charger also includes a secondary voltage conversion module, which is connected to the MCU control module and is used to supply power to the MCU control module.

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