Control circuit of automobile power adapter and automobile power adapter

Abstract

The utility model discloses a control circuit of an automobile power adapter, which comprises a main control module, an input module and a communication module, the input module is used for receiving external power input, and the main control module is electrically connected with the input module and the communication module respectively. The main control module is used for collecting the input voltage of the input module and sending the input voltage to the communication module, the communication module is in communication connection with an external receiver, and the communication module is used for sending the input voltage to the receiver. According to the utility model, the master control module acquires the voltage value of the automobile storage battery and sends the acquired voltage value to the external receiver through the communication module, so that the voltage of the automobile storage battery can be monitored in real time, and a user can quickly know the voltage condition of the automobile storage battery. Correspondingly, the utility model further discloses an automobile power adapter which comprises the control circuit.

Description

Technical Field

[0001] This utility model relates to the field of power adapter technology, and in particular to a control circuit for an automotive power adapter and an automotive power adapter. Background Technology

[0002] In the field of automotive electronics, dashcams are commonly used safety aids, and the performance of their power adapters directly affects device stability and user experience. Currently, most mainstream dashcam power adapters on the market suffer from the following technical bottlenecks: Most existing products only offer step-down power supply functionality, failing to monitor the car battery voltage in real time and provide feedback to the user. In actual use, dashcams typically use 5V power, making it impossible to directly obtain battery voltage data, thus hindering users' ability to assess the battery's health. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a control circuit and a car power adapter to solve the problem that existing car power adapters cannot monitor the car battery voltage in real time.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a control circuit for an automotive power adapter, comprising a main control module, an input module, and a communication module. The input module is used to receive external power input. The main control module is electrically connected to both the input module and the communication module. The main control module is used to acquire the input voltage of the input module and send the input voltage to the communication module. The communication module is communicatively connected to an external receiver and is used to send the input voltage to the receiver.

[0005] Furthermore, the control circuit described in this utility model also includes a DC-DC converter and a voltage output module. The DC-DC converter is electrically connected to the input module, the main control module, and the voltage output module, respectively. The DC-DC converter is used to step down and convert the input voltage of the input module to a preset working voltage and deliver the preset working voltage to the voltage output module. The voltage output module is used to provide working voltage to an external dashcam.

[0006] Furthermore, the control circuit described in this utility model also includes a gear control module, which is electrically connected to the main control module. The gear control module includes multiple low voltage threshold gears, and is used to send a target low voltage threshold gear among the multiple low voltage threshold gears to the main control module, so that the main control module performs a low voltage detection operation based on the target low voltage threshold gear.

[0007] Furthermore, in the control circuit described in this utility model, the number of low voltage threshold levels is four.

[0008] Furthermore, in the control circuit described in this utility model, the main control module includes an analog-to-digital converter module, which is electrically connected to the input module and is used to acquire the input voltage of the input module.

[0009] Furthermore, the control circuit described in this utility model also includes a low-dropout linear regulator, the input terminal of which is electrically connected to the input module, and the output terminal of which is electrically connected to the main control module.

[0010] Furthermore, the control circuit described in this utility model also includes a signal receiving module, which is connected to the main control module and is used to receive the ACC trigger signal output by the automotive ignition system.

[0011] Furthermore, the control circuit described in this utility model also includes a signal output module, which is connected to the main control module and is used to send the ACC output signal to an external dashcam.

[0012] Furthermore, in the control circuit described in this utility model, the communication module is a Bluetooth module.

[0013] Accordingly, this utility model also provides an automotive power adapter, which includes the control circuit described above.

[0014] The beneficial effects of this utility model are as follows: This utility model provides a control circuit for an automotive power adapter. The control circuit includes a main control module, an input module, and a communication module. The main control module collects the input voltage (i.e., the voltage value of the car battery) and sends the collected voltage value to an external receiver through the communication module. For example, the voltage value can be fed back to a dashcam or mobile phone receiver through Bluetooth wireless transmission, thereby realizing real-time monitoring of the car battery voltage and making it easy for users to quickly understand the voltage status of the car battery. Attached Figure Description

[0015] Figure 1 This is a circuit diagram of the control circuit of the automotive power adapter described in this utility model under one embodiment. Detailed Implementation

[0016] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0017] Please refer to Figure 1This utility model provides a control circuit for an automotive power adapter, which includes a main control module (i.e., MCU), a communication module, and an input module. The input module is used to receive external power input. The main control module is electrically connected to the input module and the communication module respectively. The main control module is used to collect the input voltage of the input module and send the input voltage to the communication module. The communication module is communicatively connected to an external receiver and is used to send the input voltage to the receiver.

[0018] As described above, the beneficial effects of this utility model are as follows: This utility model provides a control circuit for a car power adapter. The control circuit includes a main control module, an input module, and a communication module. The main control module collects the input voltage (i.e., the voltage value of the car battery) and sends the collected voltage value to an external receiver via the communication module. For example, the voltage value can be wirelessly transmitted via Bluetooth to a dashcam or mobile phone receiver, thereby achieving real-time monitoring of the car battery voltage and allowing users to quickly understand the car battery's voltage status. Furthermore, by feeding the voltage value back to a dashcam or mobile phone receiver, it is possible to quickly determine whether the dashcam malfunctions due to low voltage, facilitating troubleshooting. In practical applications, after the main control module transmits the car battery voltage to the dashcam via the communication module (such as a Bluetooth module), the dashcam can switch operating modes according to the different car battery voltage levels, such as entering sleep mode when the car battery voltage is too low.

[0019] Furthermore, the control circuit described in this utility model also includes a DC-DC converter (i.e., a step-down module) and a voltage output module. The DC-DC converter is electrically connected to the input module, the main control module, and the voltage output module, respectively. The DC-DC converter is used to step down the input voltage of the input module to a preset working voltage and deliver the preset working voltage to the voltage output module. The voltage output module is used to provide working voltage to an external dashcam.

[0020] In practical applications, the DC-DC converter can convert a 12V~30V input voltage into a stable 5V output voltage, thereby providing a stable 5V operating voltage to the dashcam and achieving stable power supply. Simultaneously, the main control module controls the on / off state of the output voltage by controlling the EN terminal of the DC-DC converter, optimizing power management.

[0021] Furthermore, the control circuit described in this utility model also includes a gear control module, which is connected to the main control module. The gear control module includes multiple low voltage threshold gears (i.e., automatic shutdown / sleep voltage values). The gear control module is used to send a target low voltage threshold gear among the multiple low voltage threshold gears to the main control module, so that the main control module performs a low voltage detection operation based on the target low voltage threshold gear.

[0022] As described above, connecting the gear control module to the main control module and including multiple low-voltage threshold levels allows users to select different low-voltage protection thresholds based on the car battery's usage, preventing over-discharge and starting failure. Simultaneously, the tiered settings balance battery power utilization with protection requirements, improving power compatibility.

[0023] Furthermore, in the control circuit described in this utility model, the number of low voltage threshold levels is four.

[0024] In practical applications, the number of low-voltage threshold levels in the gear control module can be set according to actual conditions, such as four. Similarly, the value range of each low-voltage threshold level can be set according to actual conditions and is not limited here. The four-level automatic shutdown voltage selection allows users to choose an appropriate low-voltage protection setting based on their car battery usage, maximizing the use of the car battery while avoiding draining the battery and preventing the car from starting next time.

[0025] Furthermore, in the control circuit described in this utility model, the main control module includes an analog-to-digital converter module, which is electrically connected to the input module and is used to acquire the input voltage of the input module.

[0026] In practical applications, the main control module uses an analog-to-digital converter (ADC) module to detect the ADC value of the input voltage, converts it into a voltage value, and then sends the voltage value to devices such as dashcams or mobile phones through a communication module (such as a Bluetooth module).

[0027] Furthermore, the control circuit described in this utility model also includes a low-dropout linear regulator, the input terminal of which is electrically connected to the input module, and the output terminal of which is electrically connected to the main control module.

[0028] As described above, the input voltage is converted to 3.3V by a 3.3V low dropout linear regulator (LDO) to power the main control module and ensure that the main control module obtains a stable operating voltage.

[0029] Furthermore, the control circuit described in this utility model also includes a signal receiving module, which is connected to the main control module and is used to receive the ACC trigger signal output by the automotive ignition system.

[0030] As described above, the vehicle's ignition / off state is identified by a trigger signal (i.e., the ACC trigger signal), and the power supply working mode is automatically switched (e.g., normal power supply when igniting, and low voltage detection when the vehicle is off), thereby improving the level of intelligence.

[0031] Furthermore, the control circuit described in this utility model also includes a signal output module, which is connected to the main control module and is used to send the ACC (Accessory Power Signal) output signal to an external dashcam.

[0032] As described above, after the main control module determines the current state of the car based on the ACC trigger signal, it will synchronize the current state of the car to the dashcam through the signal output module. The dashcam's working mode (such as start-stop recording) can be adjusted synchronously to optimize the user experience.

[0033] In practical applications, when the car is ignited, the ACC trigger signal is a high-level signal, which triggers the main control module to enter normal operation from sleep mode. Simultaneously, the main control module controls the ACC output signal from the signal output module to be high, sending this high-level signal to the dashcam, informing the dashcam that the car is currently ignited. When the car is turned off, the ACC trigger signal is a low-level signal. After receiving the ACC trigger signal from the signal receiving module, the main control module initiates the low-voltage detection function / operation. Simultaneously, the main control module controls the ACC output signal from the signal output module to be low, sending this low-level signal to the dashcam, informing the dashcam that the car is currently off.

[0034] Furthermore, in the control circuit described in this utility model, the communication module is a Bluetooth module.

[0035] As described above, by utilizing the low-power characteristics of Bluetooth, power consumption is reduced while transmitting voltage data, thus extending battery standby time. Furthermore, by making the communication module a Bluetooth module, it is compatible with the Bluetooth functions of devices such as dashcams, requiring no additional hardware adaptation and improving compatibility and user convenience.

[0036] Based on the control circuit described above, the following... Figure 1 The present invention also provides a specific application example to illustrate the working principle of the control circuit of the automotive power adapter.

[0037] First, it should be noted that the input voltage of the control circuit of the aforementioned car power adapter is provided by the car battery, and its operating range is 11V~30V. The input of this control circuit consists of three wires: positive, negative, and ACC. The positive and negative wires are the car battery voltage, and the ACC wire is the engine voltage after the car engine is ignited.

[0038] (1) When the car is started, the main control module can be woken up based on the ACC trigger signal of the signal receiving module, and the dashcam can be notified based on the ACC output signal. After being woken up, the input voltage is detected and Bluetooth transmission is performed, while a 5V working voltage is output to power the dashcam, as follows:

[0039] After the car is started, the ACC trigger signal is a high-level signal, triggering the main control module to start normal operation from sleep mode. At the same time, the main control module controls the ACC output signal to be high-level, and sends this high-level signal to the dashcam through the output ACC wire, so that the dashcam knows that the car is currently ignited.

[0040] The main control module detects the ADC value of the input voltage through an ADC conversion module, converts it into a voltage value, and then sends the voltage value to a dashcam or mobile phone via a Bluetooth module so that the user can obtain the car battery voltage value in real time. It should be noted that this ADC conversion module is integrated within the main control module. To effectively obtain the input voltage value, a corresponding voltage divider circuit (such as multiple voltage divider resistors) can be set up, which is electrically connected to both the input module and the main control module. In practical applications, the ADC conversion module obtains the divided analog voltage based on the voltage divider circuit. After obtaining the analog voltage, the ADC conversion module converts the analog voltage into a digital signal (i.e., the ADC value). Based on this, the main control module can calculate the actual input voltage value according to the voltage division ratio and the ADC value.

[0041] The main control module controls the EN terminal of the DC-DC converter (i.e., the 12V to 5V circuit) to output a maximum current of 4A at 5V, which provides a stable power supply to the dashcam through the positive and negative output wires.

[0042] (2) When the car is turned off, the main control module can start low voltage detection based on the ACC trigger signal of the signal receiving module, and determine whether to perform sleep operation based on the input voltage value and the target low voltage threshold, as follows:

[0043] When the car is turned off, the ACC trigger signal is a low-level signal, at which point the main control module activates the low-voltage detection function. Simultaneously, the main control module controls the ACC output signal to be low, informing the dashcam that the car is currently off.

[0044] Depending on the location of the four low voltage threshold settings, the voltage value detected by low voltage will also be adjusted accordingly. In practical applications, users can select the appropriate low voltage threshold setting according to the actual situation, and no restrictions are imposed here.

[0045] After selecting the appropriate target low voltage threshold, the main control module will perform corresponding low voltage detection operations. Specifically: when the main control module detects that the input voltage value is higher than the target low voltage threshold (selected from multiple (four) low voltage thresholds), it will maintain a 5V operating voltage output and ensure the Bluetooth module's communication function remains normal. When the main control module detects that the input voltage is lower than the target low voltage threshold, it will turn off the 5V operating voltage output and disable the Bluetooth module's communication function after a preset time (e.g., 90 seconds), entering sleep mode to prevent excessive drain of the car battery and avoid starting failure the next time the car is started.

[0046] Accordingly, this utility model also provides an automotive power adapter, which includes the control circuit described above.

[0047] As described above, the system integrates functions such as voltage monitoring, step-down power supply, Bluetooth communication, and gear control to provide an integrated power solution for dashcams.

[0048] In summary, the control circuit and car power adapter provided by this utility model have Bluetooth communication functionality, which can transmit the detected battery voltage to a dashcam or mobile phone via Bluetooth module. The dashcam can then display the battery voltage value in the recorded video, allowing users to easily understand the car battery's voltage status. Simultaneously, the multiple voltage selection options for automatic shutdown allow users to choose an appropriate low-voltage protection setting based on their car battery's usage, thereby maximizing the use of the car battery's power supply while preventing the battery from being completely drained and preventing the car from starting next time.

[0049] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A control circuit for an automotive power adapter, characterized in that, It includes a main control module, an input module, and a communication module. The input module is used to receive external power input. The main control module is electrically connected to the input module and the communication module respectively. The main control module is used to collect the input voltage of the input module and send the input voltage to the communication module. The communication module is communicatively connected to an external receiver and is used to send the input voltage to the receiver.

2. The control circuit according to claim 1, characterized in that, It also includes a DC-DC converter and a voltage output module. The DC-DC converter is electrically connected to the input module, the main control module and the voltage output module respectively. The DC-DC converter is used to step down and convert the input voltage of the input module to a preset working voltage and deliver the preset working voltage to the voltage output module. The voltage output module is used to provide the preset working voltage to an external dashcam.

3. The control circuit according to claim 1, characterized in that, It also includes a gear control module, which is electrically connected to the main control module. The gear control module includes multiple low voltage threshold gears. The gear control module is used to send a target low voltage threshold gear among the multiple low voltage threshold gears to the main control module, so that the main control module performs a low voltage detection operation based on the target low voltage threshold gear.

4. The control circuit according to claim 3, characterized in that, There are four low voltage threshold settings.

5. The control circuit according to claim 1, characterized in that, The main control module includes an analog-to-digital converter module, which is electrically connected to the input module and is used to acquire the input voltage of the input module.

6. The control circuit according to claim 1, characterized in that, It also includes a low-dropout linear regulator, the input terminal of which is electrically connected to the input module, and the output terminal of which is electrically connected to the main control module.

7. The control circuit according to claim 1, characterized in that, It also includes a signal receiving module, which is connected to the main control module and is used to receive the ACC trigger signal output by the automotive ignition system.

8. The control circuit according to claim 7, characterized in that, It also includes a signal output module, which is connected to the main control module and is used to send the ACC output signal to an external dashcam.

9. The control circuit according to claim 1, characterized in that, The communication module is a Bluetooth module.

10. A car power adapter, characterized in that, The automotive power adapter includes the control circuit described in any one of claims 1-9.

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