Electric quantity display and positioning circuit of lithium battery for bicycle

Abstract

The utility model belongs to the field of lithium batteries, in particular to an electric quantity display and positioning circuit for a lithium battery for a bicycle, which comprises an electric quantity display module, a Bluetooth positioning module and a power management module, and is characterized in that the electric quantity display module is connected with the battery and used for displaying the electric quantity of the battery; the Bluetooth positioning module is connected with the battery and the electric quantity display module, and the Bluetooth positioning module periodically broadcasts a data packet containing an equipment identifier and electric quantity information and is used for positioning a bicycle; and the power management module is connected with the electric quantity display module, the Bluetooth positioning module and the battery and is used for distributing the electric quantity of the electric quantity display module and the Bluetooth positioning module. According to the utility model, through the visual electric quantity display of the electric quantity display module, the convenient positioning function of the Bluetooth positioning module and the low-power-consumption electric quantity distribution mode of the power management module, the problems of inaccurate electric quantity judgment and inconvenient positioning in the use process of the lithium battery of the existing electric bicycle are solved; and the use experience of the user and the management efficiency of the battery are improved.

Description

Technical Field

[0001] This utility model belongs to the field of lithium batteries and electronic appliances, and in particular to a lithium battery power display and positioning circuit for bicycles. Background Technology

[0002] With increasing environmental awareness and the growing problem of urban traffic congestion, bicycles, as a green mode of transportation, have gained popularity. Electric bicycles, in particular, have become a significant choice for daily commutes due to their convenience and efficiency. However, the lithium batteries in electric bicycles present several challenges. For example, the battery level display is not intuitive, making it difficult for users to accurately assess the remaining charge and thus affecting their travel plans. Furthermore, the current chaotic bicycle parking management system often makes it difficult for users to quickly locate their bicycles, wasting time and energy. Battery theft is also a common problem, causing financial losses and inconvenience for users. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a lithium battery power display and positioning circuit for bicycles. This solves the problems of inaccurate power judgment and inconvenient positioning of lithium batteries in electric bicycles during use, improves the user experience and battery management efficiency, and has broad application prospects.

[0004] The technical solution adopted by this utility model to solve the technical problem is:

[0005] This utility model provides a lithium battery power display and positioning circuit for bicycles, including: a power display module, a Bluetooth positioning module, and a power management module. The power display module is connected to the battery and is used to display the battery power. The Bluetooth positioning module is connected to the battery and the power display module, and periodically broadcasts data packets containing device identifiers and power information to achieve bicycle positioning. The power management module is connected to the power display module, the Bluetooth positioning module, and the battery, and is used to allocate power to the power display module and the Bluetooth positioning module.

[0006] Furthermore, the user receives signals sent by the Bluetooth positioning module through the Find My network.

[0007] Furthermore, the power display module includes multiple comparators, which display the current power level by comparing the comparator voltages.

[0008] Furthermore, the power display module includes multiple LED beads for displaying the current power level. Each comparator corresponds to a power level segment, and the number of lit LEDs indicates the current power level.

[0009] Furthermore, the power management module includes a primary power supply and a secondary power supply, wherein the primary power supply uses a dual Zener diode series configuration to regulate the NMOS gate voltage.

[0010] Furthermore, it also includes a button level conversion circuit, which converts the power supply of the power display module into button signals, enabling single-button control of the power display module and the Bluetooth positioning module.

[0011] Furthermore, it also includes a buzzer for emitting a sound when the device is being located.

[0012] Furthermore, it also includes a variety of external interfaces for connecting different types of power supplies or signals.

[0013] The advantages and positive effects of this utility model are:

[0014] 1. Intuitive power display: This utility model uses LED beads in the power display module to intuitively display the remaining battery power, making it convenient for users to know the battery status at any time and make reasonable travel plans.

[0015] 2. Convenient positioning function: This utility model utilizes the BLE broadcast function of the Bluetooth positioning module and Apple Find My network, allowing users to view the location of the battery anytime and anywhere through the user's wireless network device application, making it convenient and quick to find the battery or bicycle, especially performing excellently in complex parking environments.

[0016] 3. Low power consumption design: This utility model optimizes power management through a power management module to ensure that the battery life is extended without affecting the main functions.

[0017] 4. User-friendly: This utility model enables remote monitoring and location display through a user wireless network device application, allowing users to easily monitor battery status anytime, anywhere.

[0018] 5. Privacy Protection: This utility model utilizes Apple's Find My Network's end-to-end encryption technology to ensure the security and privacy of user data. Attached Figure Description

[0019] Figure 1 This is a circuit block diagram of the lithium battery power display and positioning circuit for bicycles according to this utility model;

[0020] Figure 2 This is a circuit diagram of the power display module of this utility model;

[0021] Figure 3 This is a circuit diagram of the Bluetooth positioning module of this utility model;

[0022] Figure 4 This is the circuit diagram of the buzzer of this utility model;

[0023] Figure 5 Circuit diagram of primary power supply of power management module of the utility model;

[0024] Figure 6 Circuit diagram of secondary power supply of power management module of the utility model;

[0025] Figure 7 Circuit diagram of key level conversion circuit of the utility model;

[0026] Figure 8 Circuit diagram of external interface of the utility model. DETAILED DESCRIPTION

[0027] It should be noted that the embodiments and the features in the embodiments in the present application can be combined with each other without conflict.The present utility model will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0028] It should be noted that all the technical and scientific terms used in the present application have the same meaning as that generally understood by the ordinary skilled in the art to which the present application belongs unless otherwise specified.

[0029] As shown in Figure 1 The utility model provides a kind of lithium battery electric quantity display and positioning circuit for bicycle, including: electric quantity display module, bluetooth positioning module, power management module.Electric quantity display module is connected with battery, for showing the electric quantity of battery.Blue tooth positioning module is connected with battery and electric quantity display module, the data packet containing equipment identifier and electric quantity information is periodically broadcasted by the blue tooth positioning module, for realizing the positioning of bicycle.Power management module connects electric quantity display module, bluetooth positioning module and battery, for distributing the electric quantity of electric quantity display module and bluetooth positioning module.

[0030] As shown in Figure 2As shown, the power display module includes a key switch S1, a capacitor C6, a plurality of resistors, a plurality of LEDs, a plurality of comparators, and a diode DZ1. The power display module uses a 2.5V power supply, which is connected to the positive input terminal of the comparator through resistors R13 and R6. Each comparator has two input terminals (positive input and negative input) and one output terminal. The positive input terminal is connected to the ground through resistors (R29, R30, R9). The output terminal of the comparator is connected to the LED (D2, D3, D4, D5) through current-limiting resistors (R4, R10). When the positive input voltage of the comparator is higher than the negative input voltage, the comparator outputs a high level, and the LED is lit. By observing the number of lit LEDs, the current power can be intuitively displayed. By adjusting the resistance values (R29, R30, R9), different voltage thresholds can be set to achieve segmented display of the power. Resistors R3, R11, R4, and R10 are used for current limiting to protect the LED and the comparator. Diode DZ1 is used to prevent damage to the comparator and protect the circuit from incorrect voltage platforms or surge voltages. The key S1 and the capacitor C6 form a debounce circuit to stabilize the key input signal. When the key is pressed, the KEY node is connected to the Pack power supply, which powers the comparator. The power display module displays the current power by comparing the voltages of the comparators. The plurality of LED lamp beads of the power display module are used to display the current power. Each comparator corresponds to a power segment, and the number of lit LEDs represents the level of the current power.

[0031] The power detection principle of the power display module is to estimate the remaining power by detecting the voltage of the lithium battery. There is a certain relationship between the voltage of the lithium battery and the remaining power. By using a pre-set voltage and power corresponding relationship curve, the remaining power of the battery can be accurately estimated. A voltage sensor is embedded in the circuit board (power display board), which includes a comparator and a voltage dividing resistor. When the key is pressed, the comparator is powered on, and the power is estimated by voltage. The estimated power value is displayed through the LED lamp beads. That is, the power display module collects the battery voltage through the voltage sensor, calculates the power percentage according to the voltage value, and controls the LED lamp beads to display.

[0032] The power display module displays the remaining power of the battery directly by using LED light groups. The power display module displays the current power by comparing the voltage. Different number of LED light beads represent different power intervals. For example, 4 LED light beads represent more than 75% power, 3 LED light beads represent 50%-75% power, 2 LED light beads represent 25%-50% power, and 1 LED light bead represents less than 25% power. In addition, different colors of LED light beads can further indicate the power status. For example, blue represents sufficient power, green represents medium power, and red represents low power, reminding the user to charge in time.

[0033] Implementation of the power display function: After the user installs the circuit board (power display board), the circuit board (power display board) can start working by simple settings (such as adjusting the rated voltage through the switch). During the riding process, the user can check the status of the LED light at any time to understand the remaining power of the battery.

[0034] Figure 3The Bluetooth positioning module is positioned. U6 is the core board of the Bluetooth module, responsible for processing Bluetooth communication and control. Among them, the user receives the signal sent by the Bluetooth positioning module through the Find My network. The Bluetooth module core board U6 cooperates with the program through the internal dedicated MCU, and transmits the BLE broadcast signal to the outside world, which is used to access the FindMy network. In the circuit board (power display board), the Bluetooth module core board U6 integrates the Bluetooth Low Energy (BLE, Bluetooth Low Energy) module, which periodically sends data packets containing device unique identifier (UUID, Universally Unique Identifier) and power information through the BLE broadcast function. These data packets can be received by nearby Apple devices (such as iPhone, iPad, etc.). Through the BLE broadcast function of the Bluetooth Low Energy module, the data packet is broadcasted once every certain time (such as 1 second), ensuring that nearby devices can receive the signal in time. Using Apple's Find My network, nearby Apple devices (user wireless network devices) receive BLE broadcast signals, which will upload the device's location information to the cloud through Apple's server anonymously. Device owners can view the current location of the device through the Find My application, thereby realizing remote positioning and tracking of the battery or bicycle. FindMy network uses end-to-end encryption to ensure user privacy and data security. Through Bluetooth RSSI (signal strength indication) technology, nearby Apple devices can estimate the distance from the broadcasting device, and combined with three coordinate technology, achieve meter-level positioning accuracy. In indoor environments, FindMy network can use the GPS and Wi-Fi positioning functions of Apple devices to further improve positioning accuracy. That is, the Bluetooth positioning module is used to periodically broadcast data packets containing device identifiers, and remote positioning is realized through the Apple Find My network. The FindMy network device (user wireless network device) is used to display the current location of the device, making it easy for users to find.

[0035] Implementation of positioning function: after installing the circuit board (power display board), the user binds the device through the mobile phone application. During riding or after parking, the user can check the current location of the battery at any time through the mobile phone application. For example, in a large parking lot or complex environment, the user can quickly find the location of the bicycle through the positioning function, saving time and effort.

[0036] Figure 4The buzzer driving circuit is used to emit sound when the user searches for the device. The buzzer driving circuit comprises a triode Q6, a resistor R1, a diode D10, a resistor R2, a buzzer BUZZER1, the No. 1 pin of the buzzer BUZZER1 is connected with the negative electrode of the diode D10 and the resistor R2, the other end of the resistor R2 is connected with the positive electrode VCC of the power supply, the No. 2 pin of the buzzer BUZZER1 is connected with the positive electrode of the diode D10 and the collector of the triode Q6, the base of the triode Q6 is connected with the resistor R1, the other end of the resistor R1 is connected with the No. 2 pin of the Bluetooth module core board U6, and the emitter of the triode Q6 is grounded. When the BEEP signal is high, the triode Q6 is turned on, the current flows through the resistor R2 to the buzzer, and the buzzer emits sound. The diode D10 provides reverse voltage protection to prevent the reverse electromotive force generated when the buzzer is turned off from damaging the triode Q6. When the buzzer is turned off, the diode D10 is turned on to provide a path for the reverse electromotive force to be released, thereby protecting the triode Q6 from being damaged. When the BEEP signal is low, the triode Q6 is turned off, and the buzzer stops emitting sound.

[0037] The power management module comprises a primary power supply and a secondary power supply. Figure 5 The primary power supply circuit comprises a power input end B+, a plurality of resistors, an NMOS tube Q1, two voltage stabilizing tubes, and two capacitors. The source of the NMOS tube Q1 is connected with the resistor R19, the capacitor C4, and a 5V voltage, the other end of the resistor R19 and the capacitor C4 are grounded, the gate of the NMOS tube Q1 is connected with the capacitor C1, the negative electrode of the voltage stabilizing tube D1, and the positive electrode of the voltage stabilizing tube D9, the other end of the capacitor C1 and the positive electrode of the voltage stabilizing tube D1 are grounded, the negative electrode of the voltage stabilizing tube D9 is connected with the resistor R15, the other end of the resistor R15 is connected with the resistor R16, the drain of the NMOS tube Q1 is connected with the resistor R17 and the resistor R18, and the other end of the resistor R17, the other end of the resistor R18, and the other end of the resistor R16 are all connected with the power input end B+.

[0038] The primary power supply of the power management module adopts a double voltage stabilizing tube series connection mode to adjust the gate voltage of the NMOS. When the power supply voltage gradually decreases to the design threshold value, the MOS output voltage gradually decreases linearly. The Bluetooth module can judge the power supply state through voltage change and correctly report low power prompt information and the like. When the power supply voltage further decreases, the output is completely turned off to prevent the battery from being over-discharged due to the Find My network module. At this time, the power of the battery will be distributed to other places.

[0039] Figure 6The secondary power supply of the power management module is used for reducing the voltage of the primary power supply to a voltage suitable for other circuits.

[0040] Figure 7 The key level conversion circuit is used for converting the power supply of the power display module into a key signal, and realizing single-key control of the power display module and the Bluetooth positioning module.

[0041] The user can control the connection or disconnection of the total power supply of the power display module through the key KEY. When the key KEY is not pressed, the power display module is completely disconnected, and the power is saved. At this time, there is no base current, the triode Q4 is cut off, the LED_SW is pulled up to VCC, and the Bluetooth positioning module (Bluetooth module core board) considers that the key is not pressed. When the key is pressed, the KEY node is connected to PACK+, at this time the power display module is connected, and the power is normally displayed. At the same time, through the resistance R21, the triode Q4 has a base current, the triode Q4 is turned on, the LED_SW is pulled down, and the Bluetooth positioning module (Bluetooth module core board) receives that the key is pressed. Thus, the single key is used to control the power display module and the Bluetooth module.

[0042] The power management module can ensure the normal work of the positioning and power display functions, and has a good power management function. When the battery power is sufficient, the positioning and power display functions are normally operated. When the battery power is low, the normal operation of the power display function is preferentially ensured, and the power consumption of the Bluetooth positioning module is reduced, thereby prolonging the service life of the battery. The power management module is used for managing power distribution and ensuring the operation of key functions, and preventing the damage of the lithium battery due to over-discharge.

[0043] In addition, as Figure 8 shown, the utility model still has H1, H2, USB1, U2 and the like rich external interface, can conveniently link different types of power supply, signal, is used for communication or charging.

[0044] The above only describes preferred embodiments of the utility model, and is not used for limiting the utility model. For those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A lithium battery power display and positioning circuit for a bicycle, characterized by, The application relates to a bicycle power management system, which comprises the following modules: a power display module connected with a battery, used for displaying the power of the battery; a Bluetooth positioning module connected with the battery and the power display module, which periodically broadcasts data packets containing device identifiers and power information, used for realizing the positioning of the bicycle; a power management module connected with the power display module, the Bluetooth positioning module and the battery, used for distributing the power of the power display module and the Bluetooth positioning module.

2. The lithium battery power display and positioning circuit for bicycle according to claim 1, characterized in that, Users receive the signals sent by the Bluetooth positioning module through the FindMy network.

3. The lithium battery power display and positioning circuit for bicycle of claim 1, wherein, The power display module comprises multiple comparators, which display the current power through the voltage comparison of the comparators.

4. The lithium battery power display and positioning circuit for bicycle according to claim 3, characterized in that, The power display module comprises multiple LED lamp beads, used for displaying the current power, each comparator corresponds to a power section, and the number of the lighted LED lamp beads represents the level of the current power.

5. The lithium battery power display and positioning circuit for bicycle of claim 1, wherein, The power management module comprises a primary power supply and a secondary power supply, and the primary power supply adopts a double-stable voltage tube series connection mode to adjust the gate voltage of an NMOS.

6. The lithium battery power display and positioning circuit for bicycle of claim 1, wherein, The application further comprises a key level conversion circuit, which is used for converting the power supply of the power display module into a key signal, so as to realize the single-key control of the power display module and the Bluetooth positioning module.

7. The lithium battery power display and positioning circuit for bicycle of claim 1, wherein, The application further comprises a buzzer, which is used for emitting sound when the device is searched.

8. The lithium battery power display and positioning circuit for bicycle of claim 1, wherein, The application further comprises multiple external interfaces, which are used for linking different types of power supplies or signals.

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