A bicycle light

Abstract

The utility model discloses a bicycle car light includes car light module, input protection and rectification filter module, boost -buck voltage stabilizing module, MCU and power management module, lithium battery charging and management module, lithium battery and system power supply bus. The utility model uses lithium battery as power supply buffer unit, stores the redundant electric energy of motorized hub and provides system energy when motorized hub power insufficiency or stop, and the endurance of the prior farad capacitor scheme is obviously superior. In addition, the utility model still adopts two high -power zener diode series connection circuit and pinches the high voltage peak (maximum 58V) of motorized hub output to below safe voltage, can inhibit instantaneous overvoltage, avoids the damage of the back -stage circuit because of overvoltage.

Description

Technical Field

[0001] This utility model relates to the technical field of bicycle lights, specifically to a bicycle light. Background Technology

[0002] Currently, bicycles typically generate electricity by using a 6V / 3W electric hub to produce AC power for the headlights. However, the actual voltage of the electric hub varies greatly depending on the load. Under no-load conditions, it can easily reach over 30V (58V peak), while at low speeds (below 15 km / h) in busy traffic or complex road conditions, the voltage may drop below 2V. This reduces the brightness of the headlights, causing them to flicker and affecting illumination. Furthermore, the significant output fluctuations can easily burn out downstream circuitry. When braking, the electric hub stops generating electricity, and the headlights turn off, making high brightness impossible.

[0003] The lights that come with electric hubs on the market usually contain farad capacitors, but farad capacitors have limited capacity and can barely light up the taillights, not the headlights. Utility Model Content

[0004] In order to overcome the defects and shortcomings of the prior art, this utility model provides a bicycle light.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a bicycle light, including a light module, an input protection and rectification filter module, a step-up and step-down voltage regulator module, an MCU and power management module, a lithium battery charging and management module, a lithium battery and a system power supply bus; The vehicle light module is used for lighting or warning purposes; The input protection and rectification filtering module is connected to an external electric hub and to the system power supply bus via a buck-boost voltage regulator module. The input protection and rectification filtering module is used to clamp, rectify, and filter the voltage input to the electric hub. The buck-boost voltage regulator module is used to regulate the DC voltage output from the input protection and rectification filtering module to a second threshold and provide it to the system power supply bus. The system power supply bus is connected to the MCU and power management module, the vehicle lighting module and the lithium battery charging and management module respectively, and is used to provide power. The MCU and power management module are connected to the lithium battery through the lithium battery charging and management module, and are configured to control the charging of the lithium battery, discharge or shut down the system power supply bus through the lithium battery charging and management module.

[0006] As a preferred technical solution, the input protection and rectification filtering module includes a clamping circuit composed of two Zener diodes connected in series, a full-bridge rectifier circuit, and a filter capacitor circuit; the clamping voltage of the clamping circuit is set to 12V.

[0007] As a preferred technical solution, the MCU and power management module are equipped with a voltage detection unit, and are configured as follows: When the voltage detection unit detects that the power supply voltage of the electric hub is greater than or equal to the first threshold, or the power supply voltage of the system power supply bus is equal to the second threshold, it sends a control signal to the lithium battery charging and management module to control the lithium battery to charge and stop discharging. When the voltage detection unit detects that the supply voltage of the system power supply bus is less than the first threshold or the supply voltage of the system power supply bus is less than the second threshold, it sends a control signal to the lithium battery charging and management module to control the lithium battery to discharge and provide power to the system power supply bus. When the voltage detection unit detects that the output voltage of the lithium battery is lower than the third threshold, it sends a control signal to the lithium battery charging and management module to cut off the lithium battery discharge circuit.

[0008] As a preferred technical solution, the MCU and power management module also include a timer, configured as follows: When the electric hub is detected to have no power supply for a threshold time, the headlight module is turned off. When the electric hub is detected to start generating electricity, the headlight module is activated.

[0009] As a preferred technical solution, the vehicle lighting module includes a front LED module and a rear LED module, wherein the front LED module is located at the front of the vehicle and serves as the main lighting source, and the rear LED module is located at the rear of the vehicle and is used to indicate braking or provide visibility; both the front LED module and the rear LED module include LED beads and a TVS protection circuit.

[0010] As a preferred technical solution, the front LED module and the rear LED module are connected using one of the following connection methods: 1) The input protection and rectification filtering module, buck-boost voltage regulator module, MCU and power management module, lithium battery charging and management module, lithium battery and system power supply bus are integrated into the front LED module, and the rear LED module is connected to the system power supply bus; 2) The input protection and rectification filtering module, buck-boost voltage regulator module, MCU and power management module, lithium battery charging and management module, lithium battery and system power supply bus are integrated into the rear LED module, and the front LED module is connected to the system power supply bus; 3) The input protection and rectification filtering module, buck-boost voltage regulator module, MCU and power management module, lithium battery charging and management module, lithium battery and system power supply bus are integrated into a separate module, which supplies power to the front LED module and the rear LED module respectively through the system power supply bus.

[0011] As a preferred technical solution, the first threshold is set to 2V, the second threshold is set to 5V, and the third threshold is set to 3V.

[0012] As a preferred technical solution, the threshold time is set to 2-4 minutes.

[0013] Compared with the prior art, this utility model has the following advantages and beneficial effects: (1) This utility model uses two high-power Zener diodes connected in series (clamping 12V) in the input protection and rectification filter module to clamp the high voltage spikes output by the electric hub to below the safe voltage, covering the power generation range of the electric hub (low speed <2V, spike 58V), solving the problem of insufficient voltage adaptation in the existing solution and the problem of damage to the subsequent circuit due to overvoltage.

[0014] (2) This utility model converts the unstable DC power (DC 2-12V) output by the input protection and rectification filter module into a stable DC power (DC 5V) through the step-up and step-down voltage regulator module, which can prevent the vehicle lights from flickering and ensure stable lighting effect.

[0015] (3) This utility model uses a lithium battery as a power supply buffer unit to store excess electrical energy of the electric hub and provide power to the system power supply bus when the electric hub is underpowered. At 3.7V, the 300mAh lithium battery stores 1.11Wh (3996J) of energy, which is equivalent to the energy storage of a 584F farad capacitor. It can maintain the high brightness of the front and rear lights for 2-4 minutes after the electric hub stops generating electricity (the farad capacitor can only maintain it for a few seconds). This is significantly better than the battery life of the existing farad capacitor solution and overcomes the defect of the electric hub not being able to supply power to light up the front lights when the riding speed is low or when braking in the existing technology.

[0016] (4) This utility model detects the duration of the electric hub's power supply stop. If the time exceeds the preset duration, it will enter the sleep mode, reducing ineffective power consumption. It also avoids damage to the lithium battery through 3V over-discharge protection, thereby increasing the lithium battery cycle life to more than 500 times.

[0017] (5) This utility model simplifies the front or rear light into a structure of “LED bead + TVS circuit + power taken from another lamp or a separate integrated module”, which reduces material costs by more than 30% compared to the solution of integrating module circuits for both front and rear lights. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the overall frame structure of a bicycle lamp according to this utility model. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0020] Example 1: like Figure 1 As shown, this embodiment provides a bicycle light, including a light module, an input protection and rectification filtering module, a buck-boost voltage regulator module, an MCU and power management module, a lithium battery charging and management module, a lithium battery and a system power supply bus; The vehicle light module is used for lighting or warning purposes; The input protection and rectification filtering module is connected to an external electric hub (preferably 6V / 3W, a common market model; this invention can also be adapted to electric hubs of other power ratings, requiring only adjustment of the parameters of the subsequent clamping circuit and buck-boost voltage regulator module), and is connected to the system power supply bus via the buck-boost voltage regulator module; the input protection and rectification filtering module is used to clamp, rectify, and filter the voltage input to the electric hub; the buck-boost voltage regulator module is used to regulate the DC voltage output from the input protection and rectification filtering module to a second threshold and provide it to the system power supply bus; The system power supply bus is connected to the vehicle lighting module, MCU and power management module and lithium battery charging and management module respectively to provide power. The MCU and power management module are connected to the lithium battery through the lithium battery charging and management module, and are configured as follows: The lithium battery charging and management module controls the following functions of the lithium battery: 1) charging; 2) discharging to the system power supply bus; 3) shutting down the discharge circuit. The lithium battery is used to store excess power provided by the electric hub and to provide power to the system power bus when the electric hub's power supply is insufficient or stops.

[0021] In one or more preferred embodiments, the input protection and rectification filtering module includes a clamping circuit consisting of two high-power Zener diodes connected in series, a full-bridge rectifier circuit, and a filter capacitor circuit. When the electric hub generates a voltage above 30V or a 58V spike under no-load conditions, the Zener diode breaks down in reverse, stabilizing the voltage below the safe voltage (clamping voltage) to prevent damage to the subsequent rectification and filtering sections and the buck-boost voltage regulator module due to overvoltage; the Zener diode can be a 12V / 5W specification. The full-bridge rectifier circuit is used to convert the input AC voltage into DC voltage (preferably DC2-12V) output.

[0022] In one or more preferred embodiments, the buck-boost regulator module is used to regulate the unstable DC voltage (preferably DC 2-12V) output from the input protection and rectification filter module to a constant DC voltage (preferably DC 5V) and provide it to the system power supply bus. The buck-boost regulator module chip can be either TPS63070RNMT (Texas Instruments) or the domestic MT3608. The TPS63070RNMT offers higher voltage regulation accuracy and faster dynamic response when the input voltage fluctuates (2-12V), making it suitable for scenarios where the voltage of the electric hub changes frequently.

[0023] In one or more preferred embodiments, the output voltage of the system power supply bus is set to 5V.

[0024] In one or more preferred embodiments, the vehicle lighting module includes a front LED module and a rear LED module, wherein the front LED module is located at the front of the vehicle and serves as the main lighting source, and the rear LED module is located at the rear of the vehicle and is used to indicate braking or show the outline. Furthermore, both the front LED module and the rear LED module include LED beads and TVS protection circuits. Furthermore, the headlight LED module and the taillight LED module are connected using one of the following connection methods: (1) The input protection and rectification filtering module, buck-boost voltage regulator module, MCU and power management module, lithium battery charging and management module, lithium battery and system power supply bus are integrated in the front LED module. The rear LED module only contains LED beads and TVS protection circuit, and is connected to the system power supply bus in the front LED module to draw power. (2) The input protection and rectification filtering module, buck-boost voltage regulator module, MCU and power management module, lithium battery charging and management module, lithium battery and system power supply bus are integrated in the rear LED module. The front LED module only contains LED beads and TVS protection circuit, and is connected to the system power supply bus in the rear LED module to draw power. (3) If there is insufficient space in the front LED module and the rear LED module, the input protection and rectification filtering module, the step-up and step-down voltage regulator module, the MCU and power management module, the lithium battery charging and management module, the lithium battery and the system power supply bus can be integrated into a separate module, and the front LED module and the rear LED module can be powered through the system power supply bus respectively. The preferred connection method for the front LED module and the rear LED module can reduce the number of circuit components in the front LED module or the rear LED module, reduce the overall production cost of the front LED module and the rear LED module, and simplify the vehicle wiring (only one power supply line is needed to connect the front LED module and the rear LED module).

[0025] The output power of the electric hub is equal to the sum of the power of the headlight LED module, the power of the taillight LED module, the lithium battery charging power, and the circuit loss power.

[0026] In one or more preferred embodiments, the MCU and power management module include a voltage detection unit, configured as follows: When the voltage detection unit detects that the power supply voltage of the electric hub is greater than or equal to the first threshold, or the power supply voltage of the system power supply bus is equal to the second threshold, it sends a control signal to the lithium battery charging and management module to control the lithium battery to charge and stop discharging. When the voltage detection unit detects that the supply voltage of the system power supply bus is less than the first threshold or the supply voltage of the system power supply bus is less than the second threshold, it sends a control signal to the lithium battery charging and management module to control the lithium battery to discharge and provide power to the system power supply bus. When the voltage detection unit detects that the output voltage of the lithium battery is lower than the third threshold, it sends a control signal to the lithium battery charging and management module to forcibly cut off the lithium battery discharge circuit and prevent over-discharge from damaging the lithium battery.

[0027] Furthermore, the first threshold is set to 2V, the second threshold is set to 5V, and the third threshold is set to 3V.

[0028] In one or more preferred embodiments, the MCU and power management module further include a timer, configured as follows: When the electric hub is detected to be without power for a threshold time (when the vehicle is stopped), the headlight module is turned off and enters sleep mode. When the electric hub is detected to start generating electricity (when riding resumes), the MCU and power management module are woken up, the headlight module is activated to light up the headlights and taillights, and the charging process is started according to the current voltage of the lithium battery.

[0029] Furthermore, the threshold time is set to 2-4 minutes.

[0030] In one or more preferred embodiments, the lithium battery is a 3.7V / 300mAh pouch cell.

[0031] In another aspect of this embodiment, the control chain of the MCU and power management module is described to enable those skilled in the art to better understand the solution and principle of this utility model.

[0032] Control Link 1 - When power generation is sufficient: The MCU and power management module prohibit the lithium battery from discharging and prioritize the use of the hub for power supply; Control Link 2 - In case of insufficient / stopped power generation: The MCU and power management module control the switch to lithium battery power supply (boosted to 5V to maintain the system power supply bus); Control Link 3 - After Parking: The MCU and power management module use a timer to count the time. When the duration of continuous power failure of the electric hub reaches a threshold time (preferably 2-4 minutes), the entire circuit is shut down and enters sleep mode. Control Link 4 - Battery Protection: When the MCU and power management module detect that the lithium battery voltage is lower than the set third threshold (preferably 3V), the discharge circuit is completely shut off, thus achieving over-discharge protection; Control Link 5 - Restarting the Ride: When the MCU and power management module detect the reconstruction of the system power supply bus, they wake up and turn on the lights to resume charging of the lithium battery.

[0033] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A bicycle light, characterized in that, Includes vehicle lighting module, input protection and rectification filtering module, buck-boost voltage regulator module, MCU and power management module, lithium battery charging and management module, lithium battery and system power supply bus; The vehicle light module is used for lighting or warning purposes; The input protection and rectification filtering module is connected to an external electric hub and to the system power supply bus via a buck-boost voltage regulator module. The input protection and rectification filtering module is used to clamp, rectify, and filter the voltage input to the electric hub. The buck-boost voltage regulator module is used to regulate the DC voltage output from the input protection and rectification filtering module to a second threshold and provide it to the system power supply bus. The system power supply bus is connected to the MCU and power management module, the vehicle lighting module and the lithium battery charging and management module respectively, and is used to provide power. The MCU and power management module are connected to the lithium battery through the lithium battery charging and management module, and are configured to control the charging of the lithium battery, discharge or shut down the system power supply bus through the lithium battery charging and management module.

2. A bicycle light according to claim 1, characterized in that, The input protection and rectification filtering module includes a clamping circuit consisting of two Zener diodes connected in series, a full-bridge rectifier circuit, and a filter capacitor circuit; the clamping voltage of the clamping circuit is set to 12V.

3. A bicycle light according to claim 1, characterized in that, The MCU and power management module are equipped with a voltage detection unit, and are configured as follows: When the voltage detection unit detects that the power supply voltage of the electric hub is greater than or equal to the first threshold, or the power supply voltage of the system power supply bus is equal to the second threshold, it sends a control signal to the lithium battery charging and management module to control the lithium battery to charge and stop discharging. When the voltage detection unit detects that the supply voltage of the system power supply bus is less than the first threshold or the supply voltage of the system power supply bus is less than the second threshold, it sends a control signal to the lithium battery charging and management module to control the lithium battery to discharge and provide power to the system power supply bus. When the voltage detection unit detects that the output voltage of the lithium battery is lower than the third threshold, it sends a control signal to the lithium battery charging and management module to cut off the lithium battery discharge circuit.

4. A bicycle light according to claim 1 or 3, characterized in that, The MCU and power management module also include a timer, configured as follows: When the electric hub is detected to have no power supply for a threshold time, the headlight module is turned off. When the electric hub is detected to start generating electricity, the headlight module is activated.

5. A bicycle light according to claim 1, characterized in that, The vehicle lighting module includes a front LED module and a rear LED module. The front LED module is located at the front of the vehicle and serves as the main lighting source, while the rear LED module is located at the rear of the vehicle and is used to indicate braking or provide visibility. Both the front LED module and the rear LED module include LED beads and a TVS protection circuit.

6. A bicycle light according to claim 5, characterized in that, The front LED module and the rear LED module are connected using one of the following connection methods: 1) The input protection and rectification filtering module, buck-boost voltage regulator module, MCU and power management module, lithium battery charging and management module, lithium battery and system power supply bus are integrated into the front LED module, and the rear LED module is connected to the system power supply bus; 2) The input protection and rectification filtering module, buck-boost voltage regulator module, MCU and power management module, lithium battery charging and management module, lithium battery and system power supply bus are integrated into the rear LED module, and the front LED module is connected to the system power supply bus; 3) The input protection and rectification filtering module, buck-boost voltage regulator module, MCU and power management module, lithium battery charging and management module, lithium battery and system power supply bus are integrated into a separate module, which supplies power to the front LED module and the rear LED module respectively through the system power supply bus.

7. A bicycle light according to claim 3, characterized in that, The first threshold is set to 2V, the second threshold is set to 5V, and the third threshold is set to 3V.

8. A bicycle light according to claim 4, characterized in that, The threshold time is set to 2-4 minutes.

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