Reminding system of vehicle-mounted charger
By combining detection and alarm modules, and using resistors and logic gates or microprocessor control, the problem of the lack of forgetting reminders in vehicle wireless chargers is solved, realizing a low-cost mobile phone forgetting reminder function and reducing user safety risks.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-04-03
AI Technical Summary
Existing in-vehicle wireless chargers lack a phone forgetting reminder function, making it easy for users to forget their phones in the car, posing a security risk. In addition, the NFC implementation method is complex and expensive.
The system employs a detection module, a DC/DC conversion module, an energy storage module, and an alarm module. It detects changes in voltage levels to determine if a mobile phone has been forgotten. It uses resistors and logic gates or a microprocessor to control the alarm module to issue a notification.
It provides a simple and effective phone forgetting reminder, reduces costs, and avoids the inconvenience and security risks caused by users forgetting their phones.
Smart Images
Figure CN224082079U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vehicle charger technology, and in particular to a reminder system for vehicle chargers. Background Technology
[0002] Currently, most car wireless chargers only have mobile phone charging functionality and lack a phone forgetting reminder feature. When users place their phones on the wireless charging area of the car wireless charger, they are likely to forget their phones in the car after parking and turning off the engine. This not only causes inconvenience to users but may also cause them to miss business opportunities and poses security risks. For example, thieves may target phones forgotten in the car, smash car windows, and steal the phones, causing serious losses to users.
[0003] To prevent users from forgetting their phones in their cars while charging, existing technologies attempt to use NFC (Near Field Communication) to determine whether a user has left the car and to remind them if they have forgotten their phone. However, this method is complex and costly to implement. Utility Model Content
[0004] The main purpose of this invention is to propose a reminder system for vehicle chargers, which aims to solve the problems of complex implementation and high cost of existing reminder methods.
[0005] To achieve the above objectives, this utility model proposes a vehicle charger reminder system, comprising a detection module, a DC / DC conversion module, an energy storage module, and an alarm module. The first input terminal of the reminder system is connected to the detection module and the DC / DC conversion module, respectively. The DC / DC conversion module is connected to the energy storage module. The detection module is used to detect level changes in the input and output signals and, based on these level changes, detect the connection status of the vehicle charger to the load. The detection module is connected to the alarm module, which is used to issue an alarm when the vehicle charger is connected to the load.
[0006] In one embodiment, the detection module includes a first detection unit, a second detection unit, and a third detection unit, wherein the first detection unit is connected to the input terminal, and the first detection unit and the second detection unit are respectively connected to the third detection unit;
[0007] The first detection unit is used to detect the first level signal at the first input terminal;
[0008] The second detection unit is connected to the load and is used to detect the second level signal output by the load;
[0009] The third detection unit is used to receive the first level signal and the second level signal, and output a third level signal to the alarm module according to the first level signal and the second level signal.
[0010] In one embodiment, the third detection unit includes a logic gate and a first transistor. The first detection unit is connected to the second input terminal of the logic gate, the second detection unit is connected to the third input terminal of the logic gate, and the output terminal of the logic gate is connected to the input terminal of the first transistor. When the output terminal of the logic gate outputs a high level, the first transistor is turned on to trigger the alarm module to sound an alarm.
[0011] In one embodiment, the third detection unit includes a microprocessor, the first detection unit and the second detection unit are respectively connected to the microprocessor, the output terminal of the microprocessor is connected to the alarm module, and the microprocessor is used to detect the connection load when the car is turned on or off.
[0012] In one embodiment, the DC / DC conversion module includes a first switching transistor, a first capacitor, a first diode, and a first inductor. The drain of the first switching transistor is connected to the first input terminal, and the source of the first switching transistor is connected to the first capacitor and the first inductor.
[0013] In one embodiment, the alarm module includes an LED light and a buzzer. The input terminal of the LED light is connected to the output terminal of the detection module, and the buzzer is connected to the LED light and a first transistor.
[0014] In one embodiment, the logic gate is an AND gate.
[0015] In one embodiment, the first transistor is a bipolar transistor.
[0016] In one embodiment, the alert system further includes a USB interface connected to the detection module, the USB interface being used to connect a load.
[0017] In one embodiment, both the first detection unit and the second detection unit are resistors.
[0018] This invention employs a detection module, a DC / DC conversion module, an energy storage module, and an alarm module to issue an alarm when the car is turned off while the phone is charging in the vehicle, preventing the phone from being left inside. The detection method is simple, and using the detection module and alarm module instead of NFC saves costs. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0020] Figure 1 A schematic diagram of a reminder system for vehicle chargers;
[0021] Figure 2 This is a circuit diagram of the first embodiment;
[0022] Figure 3 This is a circuit diagram of the second embodiment;
[0023] Figure 4 This is a circuit diagram of the third embodiment.
[0024] Explanation of icon numbers:
[0025] 1. DC / DC converter module; 2. Detection module; C1. Energy storage module; 3. Alarm module; VIN, first input terminal; R5, first detection unit; R8, second detection unit; 21, third detection unit; U2A, logic gate; Q1, first transistor; U4, microprocessor; 4. Load; 5. H-bridge; U1, MCU module; Q2, first switching transistor; C3, first capacitor; D4, first diode; L1, first inductor; D5, LED; B1, buzzer; J2, USB interface.
[0026] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0028] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.
[0029] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0030] This utility model proposes a reminder system for vehicle chargers.
[0031] In the embodiments of this utility model, such as Figure 1 As shown, the reminder system includes a detection module 2, a DC / DC conversion module 1, an energy storage module C1, and an alarm module 3. The first input terminal VIN of the reminder system is connected to the detection module 2 and the DC / DC conversion module 1, respectively. The DC / DC conversion module 1 is connected to the energy storage module C1. The detection module 2 is used to detect changes in the level of the input signal and the output signal and to detect the connection status of the vehicle charger to the load 4 based on the changes in the level. The detection module 2 is connected to the alarm module 3, which is used to issue an alarm when the vehicle charger is connected to the load 4.
[0032] This invention employs a detection module 2, a DC / DC conversion module 1, an energy storage module C1, and an alarm module 3 to issue an alarm when the car is turned off while the phone is charging in the vehicle, preventing the phone from being left inside. The detection method is simple, and using the detection module 2 and alarm module 3 instead of NFC saves costs. When the first input terminal VIN is powered, it instantly charges the energy storage module C1. The energy storage module C1 is used to power the detection module 2 and provide power to the alarm module 3 after the first input terminal VIN is de-energized. The energy storage components include, but are not limited to, supercapacitors (farad capacitors) and energy storage batteries. The first transistor Q1 is a triode.
[0033] The detection module 2 includes a first detection unit R5, a second detection unit R8, and a third detection unit 21. The first detection unit R5 is connected to the input terminal, and the first detection unit R5 and the second detection unit R8 are respectively connected to the third detection unit 21. The first detection unit R5 is used to detect the first level signal of the first input terminal VIN. The second detection unit R8 is connected to the load 4 and is used to detect the second level signal output by the load 4. The third detection unit 21 is used to receive the first level signal and the second level signal and output a third level signal to the alarm module 3 according to the first level signal and the second level signal.
[0034] The first, second, and third level signals can be defined as high or low levels respectively, depending on the actual situation. The first detection unit R5 and the second detection unit R8 are both resistors. Resistors can be combined with other components (such as capacitors and transistors) to form a voltage divider circuit for detecting the level of the input signal. By using resistor voltage division, high-voltage signals can be reduced to a level suitable for processing by subsequent circuits (such as microcontrollers and comparators). Resistors are common and inexpensive components, easy to obtain and use, thus reducing costs.
[0035] First Embodiment
[0036] like Figure 2 As shown, the third detection unit 21 includes a logic gate U2A and a first transistor Q1. The first detection unit R5 is connected to the second input terminal of the logic gate U2A, and the second detection unit R8 is connected to the third input terminal of the logic gate U2A. The output terminal of the logic gate U2A is connected to the input terminal of the first transistor Q1. When the output terminal of the logic gate U2A outputs a high level, the first transistor Q1 is turned on to trigger the alarm module 3 to alarm.
[0037] In this embodiment, logic gate U2A is selected as an AND gate, which can be used to implement complex logic control functions. For example, when both the second and third inputs of the AND gate are low, the output of the AND gate is high, triggering alarm module 3 to sound an alarm.
[0038] The first input terminal VIN is the vehicle's power input terminal. When VIN is high, the DC / DC converter module 1 outputs a charging voltage, simultaneously charging the supercapacitor (or battery). When the vehicle engine is off, VIN is de-energized and goes low. The first detection unit R5 and the second detection unit R8 detect this low level, logic gate U2A outputs a high level, and the first transistor Q1 conducts, driving the alarm unit to sound or flash. If no load 4 (such as a mobile phone) is connected, the second detection unit R8 is high. Logic gate U2A outputs a low level, and the first transistor Q1 fails to conduct, so the alarm unit is not activated.
[0039] Second Embodiment
[0040] like Figure 3 As shown, the third detection unit 21 includes a microprocessor U4. The first detection unit R5 and the second detection unit R8 are respectively connected to the microprocessor U4. The output terminal of the microprocessor U4 is connected to the alarm module 3. The microprocessor U4 is used to detect the connection status of the load 4 when the car is turned on or off.
[0041] When the car engine is running, power is supplied by the first input terminal VIN, which charges the energy storage module C1. When the engine is off, power is supplied by the energy storage module C1. When the car is off, the first detection unit R5 detects a low-level input voltage, and the second detection unit R8 detects a high-level voltage, indicating that load 4 is not connected. If the second detection unit R8 detects a sudden low-level change, it indicates that the car engine is off and the onboard charger is connected to load 4, which includes household appliances such as mobile phones and computers. When the system detects that the power supply to the first input terminal VIN is off, indicating that load 4 is connected to the system output terminal, it drives the detection module 2 to emit an sound or flash, reminding the consumer that the electrical appliance has not been removed.
[0042] Third Embodiment
[0043] like Figure 4As shown, the reminder system includes a first input terminal VIN, an H-bridge 5, an MCU module U1, and an alarm module 3. The first input terminal VIN is connected to the H-bridge 5 and the MCU module U1, respectively. The alarm module 3 is connected to the H-bridge 5 and the MCU module U1, respectively. The H-bridge 5 includes switches Q4, Q5, Q6, and Q7. The drain of switch Q4 is connected to the first input terminal VIN, and the source of switch Q4 is connected to the drain of switch Q5, the source of switch Q6, and the drain of switch Q7. The source of switch Q6 is connected to the drain of switch Q7. The detection of the first input terminal VIN and the detection of the output terminal of the reminder system are completed internally by the MCU. When the input voltage is disconnected, switches Q4 and Q6 of the H-bridge 5 are turned off to prevent reverse current flow. When load 4 is present, current flows through it. The MCU module U1 can remember the charging state. When load 4 is removed, the output voltage will change abruptly and the output current will be unloaded. This can be used to determine the presence of load 4.
[0044] In addition to input and output detection, the presence of load 4 can also be detected through the communication protocol related to the USB data pin DM / DP. When load 4 is connected, communication is normal; when load 4 is disconnected, communication is not normal.
[0045] The MCU module U1 can detect multiple loads 4 simultaneously. If any of the loads 4 is connected to the charger, it can drive the alarm module 3 when the first input terminal VIN is de-energized. When the MCU module U1 determines that there is a load 4 connected and the first input terminal VIN is de-energized, it drives the alarm module 3 to emit a sound or flash to remind consumers to remove the loads 4 such as electrical appliances in time.
[0046] The DC / DC conversion module 1 includes a first switch Q2, a first capacitor C3, a first diode D4, and a first inductor L1. The drain of the first switch Q2 is connected to the first input terminal VIN, and the source of the first switch Q2 is connected to the first capacitor C3 and the first inductor L1.
[0047] By controlling the on / off state of the first switch Q2, the transmission of the input voltage is adjusted to achieve voltage rise / fall or stable output. The first capacitor C3 stores energy when the first switch Q2 is turned on and releases energy when it is turned off, which helps to smooth the output voltage and reduce ripple. The first diode D4 provides a freewheeling path when the first switch Q2 is turned off, prevents sudden current changes in the first inductor L1, protects the first switch Q2 and maintains continuous current. The first inductor L1 stores energy when the first switch Q2 is turned on and releases energy when it is turned off, thus achieving voltage conversion and stabilization.
[0048] The alarm module 3 includes an LED light D5 and a buzzer B1. The input terminal of the LED light D5 is connected to the output terminal of the detection module 2, and the buzzer B1 is connected to the LED light D5 and the first transistor Q1. In this embodiment, the sound-emitting components include, but are not limited to, the buzzer B1 and a speaker. The sound emitted can be a simple "beep" or a personalized piece of music. The light-emitting components include those that are constantly lit and those that flash, which can provide timely visual reminders.
[0049] In this embodiment, the reminder system further includes a USB interface J2, which is connected to the detection module 2 and is used to connect to the load 4 and supply power to the load 4.
[0050] It should be noted that the alarm module 3 described in this utility model is existing technology, and the improvement of this utility model does not lie in the technology of this module itself.
[0051] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. For those skilled in the art, this utility model can have various modifications, combinations, and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of the claims of this utility model.
Claims
1. A reminder system for a vehicle charger, characterized in that, The system includes a detection module, a DC / DC conversion module, an energy storage module, and an alarm module. The first input terminal of the alarm system is connected to the detection module and the DC / DC conversion module, respectively. The DC / DC conversion module is connected to the energy storage module. The detection module is used to detect changes in the levels of the input and output signals and to detect the connection status of the on-board charger to the load based on the changes in the levels. The detection module is connected to the alarm module, which is used to issue an alarm when the on-board charger is connected to the load.
2. The reminder system as described in claim 1, characterized in that, The detection module includes a first detection unit, a second detection unit, and a third detection unit. The first detection unit is connected to the input terminal, and the first detection unit and the second detection unit are respectively connected to the third detection unit. The first detection unit is used to detect the first level signal at the first input terminal; The second detection unit is connected to the load and is used to detect the second level signal output by the load; The third detection unit is used to receive the first level signal and the second level signal, and output a third level signal to the alarm module according to the first level signal and the second level signal.
3. The reminder system as described in claim 2, characterized in that, The third detection unit includes a logic gate and a first transistor. The first detection unit is connected to the second input terminal of the logic gate, and the second detection unit is connected to the third input terminal of the logic gate. The output terminal of the logic gate is connected to the input terminal of the first transistor. When the output terminal of the logic gate outputs a high level, the first transistor is turned on to trigger the alarm module to sound an alarm.
4. The reminder system as described in claim 2, characterized in that, The third detection unit includes a microprocessor. The first detection unit and the second detection unit are respectively connected to the microprocessor. The output terminal of the microprocessor is connected to the alarm module. The microprocessor is used to detect the connection load when the car is turned on or off.
5. The reminder system as described in claim 1, characterized in that, The DC / DC conversion module includes a first switching transistor, a first capacitor, a first diode, and a first inductor. The drain of the first switching transistor is connected to the first input terminal, and the source of the first switching transistor is connected to the first capacitor and the first inductor.
6. The reminder system as described in claim 1, characterized in that, The alarm module includes an LED light and a buzzer. The input terminal of the LED light is connected to the output terminal of the detection module, and the buzzer is connected to the LED light and the first transistor.
7. The reminder system as described in claim 3, characterized in that, The logic gate is an AND gate.
8. The reminder system as described in claim 3, characterized in that, The first transistor is a triode.
9. The reminder system as described in claim 1, characterized in that, The alert system also includes a USB interface, which is connected to the detection module and is used to connect a load.
10. The reminder system as described in claim 2, characterized in that, Both the first detection unit and the second detection unit are resistors.