Vehicle-mounted monitoring power supply for automobile data recorder

Abstract

The utility model discloses a vehicle-mounted monitoring power supply for an automobile data recorder, which can supply power to the automobile data recorder after an automobile is shut down, prevent a storage battery of the automobile from being overdischarged, and also can provide an automobile shut-down identification signal for the automobile data recorder, so that the automobile data recorder enters a parking monitoring mode to continue working after the automobile is shut down. The vehicle-mounted monitoring power supply comprises a battery pack, a BMS module, a DC-DC module, an MCU module, an input interface, a DC output module, an output interface and a switch. Wherein the BMS module is used for monitoring and managing the working state of the battery pack; the DC-DC module is used for providing a constant-current and constant-voltage power supply required by charging for the battery pack; the MCU module is used for controlling the working state of the vehicle-mounted monitoring power supply; the input interface is connected with the DC-DC module, and the DC output module is connected with the automobile data recorder through the output interface and a voltage reduction line; the output interface comprises an ACC signal end used for recognizing the state of the vehicle so as to judge whether the vehicle is in a shutdown state or not, and the automobile data recorder enters or exits from a parking monitoring mode. And the switch is connected with the MCU module.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle monitoring technical field especially relates to a vehicle monitoring power supply for automobile data recorder. BACKGROUND

[0002] With the economic development and the acceleration of urbanization, the popularity rate of household cars as a travel tool is higher and higher, and the market demand of automobile data recorder products is also growing; the automobile data recorder product is used for recording and storing the image and sound information in the vehicle driving process; after installing the automobile data recorder, not only can the video image and sound in the automobile driving process be recorded and checked, but also the evidence for traffic accidents can be provided, and the parking monitoring function can be provided after parking.

[0003] The parking monitoring principle of the automobile data recorder is as follows: the automobile data recorder is connected with the vehicle safety box and ACC output through the step-down line, the step-down line is a direct current step-down module, the input end of the step-down line is connected with the output (VCC, GND and ACC) of the vehicle safety box, the VCC is the output voltage of the vehicle battery, the ACC is the output voltage of the vehicle battery after the ignition switch control, and the output end of the step-down line is connected with the power input end of the automobile data recorder; when the vehicle is started, the ACC output of the vehicle safety box is high level, and when the vehicle is stopped, the output is closed, the ACC voltage is provided to the automobile data recorder after being stepped down by the step-down line, the automobile data recorder recognizes the vehicle state (start / running or stop) through the ACC voltage provided by the step-down line, and then enters or exits the parking monitoring mode.

[0004] The parking monitoring mode of the automobile data recorder is usually started automatically when the sensor detects the vehicle vibration or the moving image, and if the vehicle is damaged during parking, the parking monitoring image can be checked.

[0005] When the vehicle is stopped, if the vehicle safety box is used excessively, the vehicle battery will be discharged, the vehicle cannot be started, and the vehicle battery is damaged, so how to prevent the vehicle battery from being discharged excessively and obtain continuous power supply in the vehicle stop state is a problem to be solved in the use of the automobile data recorder. UTILITY MODEL CONTENTS

[0006] One of the purposes of the utility model at least is to provide a vehicle monitoring power supply for automobile data recorder, which can provide power supply for the automobile data recorder when the vehicle is stopped, prevent the vehicle battery from being discharged excessively, and provide the vehicle stop identification signal for the automobile data recorder, so that the automobile data recorder enters the parking monitoring mode and continues to work after the vehicle is stopped.

[0007] In order to achieve the above purpose, the utility model adopts the following technical schemes.

[0008] A vehicle-mounted monitoring power supply for a driving recorder, comprising:

[0009] a battery pack for providing electric energy for the driving recorder;

[0010] a BMS module connected with the battery pack and the MCU module respectively, for monitoring and managing the working state of the battery pack;

[0011] a DC-DC module connected with the BMS module and the MCU module respectively, for providing constant current and constant voltage power supply required for charging the battery pack;

[0012] an MCU module for controlling the working state of the vehicle-mounted monitoring power supply;

[0013] an input interface connected with the DC-DC module, for connecting a vehicle fuse box or a vehicle cigarette lighter;

[0014] a DC output module connected with the BMS module and the MCU module respectively, for connecting the driving recorder through an output interface and a step-down line;

[0015] the output interface comprises a first output interface connected with the DC output module, and the first output interface comprises an ACC signal end for identifying the state of the vehicle, so that the driving recorder can determine whether the vehicle is in a shutdown state, and the driving recorder can enter or exit a parking monitoring mode;

[0016] a switch connected with the MCU module, for controlling the on or off state of the vehicle-mounted monitoring power supply.

[0017] Preferably, the first output interface further comprises a VCC end and a GND end, the ACC signal end of the first output interface is connected with the ACC end of the input end of the step-down line, the VCC end of the first output interface is connected with the VCC end of the input end of the step-down line, the GND end of the first output interface is connected with the GND end of the input end of the step-down line, the output end of the step-down line comprises an ACC end, a VCC end and a GND end, the input end of the driving recorder comprises an ACC end, a VCC end and a GND end, and the output end of the step-down line is connected with the input end of the driving recorder.

[0018] Preferably, the output interface further comprises a second output interface, the second output interface is connected with a USB output module, the USB output module is connected with the BMS module, and the USB output module is further connected with the MCU module.

[0019] Preferably, the second output interface is a USB interface, and the USB interface adopts a USB-A, USB-C, USB-Micro or USB-Mini interface.

[0020] Preferably, the second output interface is integrated with an ACC signal terminal for identifying the vehicle state.

[0021] Preferably, the USB output module comprises an overcurrent protection circuit and a short-circuit protection circuit, and the DC output module comprises an overcurrent protection circuit and a short-circuit protection circuit.

[0022] Preferably, the DC-DC module comprises an overvoltage detection circuit and an undervoltage detection circuit.

[0023] Preferably, the vehicle-mounted monitoring power supply further comprises an LED display module for displaying the power, and the LED display module is electrically connected with the MCU module.

[0024] Preferably, the input interface is connected with a vehicle cigar lighter port through a cigar lighter connecting line, and an ACC terminal, a VCC terminal and a GND terminal are arranged at the output end of the cigar lighter connecting line, and the ACC terminal of the output end of the cigar lighter connecting line is connected with the GND terminal through a resistor.

[0025] In summary, due to the adoption of the above technical scheme, the vehicle-mounted monitoring power supply for a vehicle recorders has at least the following beneficial effects:

[0026] The vehicle-mounted monitoring power supply for a vehicle recorders can provide power for the vehicle recorder after the vehicle is turned off, which is beneficial to prevent the vehicle battery from being over-discharged and damaged.

[0027] By arranging the ACC signal terminal for identifying the vehicle state at the output interface, the vehicle recorder can identify whether the vehicle is in the off state according to the ACC voltage of the output interface after the output interface is connected with the vehicle recorder through a step-down line or directly, so as to control the vehicle recorder to enter or exit the parking monitoring mode.

[0028] The input interface is connected with the DC-DC module, and the input interface can be connected with the vehicle fuse box for charging or connected with the vehicle cigar lighter port for charging, and can determine the charging type and automatically adjust the charging power by detecting the voltage and state of the ACC terminal of the input interface, which is beneficial to improve the flexibility of the use occasion of the vehicle-mounted monitoring power supply. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structure schematic view of the vehicle-mounted monitoring power supply for a vehicle recorder of an exemplary embodiment of the present application.

[0030] Figure 2 is a cigar lighter connecting line schematic view of an exemplary embodiment of the present application.

[0031] Identified in the figure: 1-battery pack, 2-BMS module, 3-DC-DC module, 4-MCU module, 5-input interface, 6-DC output module, 7-output interface, 71-first output interface, 72-second output interface, 8-switch, 9-USB output module, 10-LED display module, 11-cigar lighter connecting line, 12-resistor. DETAILED DESCRIPTION

[0032] The utility model will be further explained in detail in combination with the drawings and examples, so that the purpose, technical scheme and advantages of the utility model are more clear and explicit. It should be understood that the specific examples described here are only used to explain the utility model and are not used to limit the utility model.

[0033] Reference Figure 1 The vehicle-mounted monitoring power supply for the driving recorder of the exemplary embodiment of the utility model comprises:

[0034] The battery pack 1 is used for providing electric energy for the driving recorder;

[0035] The BMS module 2 is connected with the battery pack 1 and the MCU module 4 respectively, and is used for monitoring and managing the working state of the battery pack 1;

[0036] The DC-DC module 3 is connected with the BMS module 2 and the MCU module 4 respectively, and is used for providing the constant current and constant voltage power supply required for charging the battery pack 1;

[0037] The MCU module 4 is used for controlling the working state of the vehicle-mounted monitoring power supply;

[0038] The input interface 5 is connected with the DC-DC module 3, and is used for connecting the vehicle fuse box or the vehicle cigar lighter;

[0039] The DC output module 6 is connected with the BMS module 2 and the MCU module 4 respectively, and is connected with the driving recorder through the output interface and the voltage reduction line;

[0040] The output interface 7 comprises the first output interface 71 connected with the DC output module 6, and the first output interface 71 comprises the ACC signal end used for identifying the vehicle state, so that the driving recorder can identify whether the vehicle is in the off state, and the driving recorder can enter or exit the parking monitoring mode;

[0041] The switch 8 is connected with the MCU module 4, and is used for controlling the opening or closing state of the vehicle-mounted monitoring power supply.

[0042] The vehicle-mounted monitoring power supply can supply power to the driving recorder in the vehicle shutdown state, can distinguish the vehicle state according to the input ACC voltage and VCC voltage and output an ACC identification signal, and can make the driving recorder enter the parking monitoring mode after the vehicle is shutdown according to the ACC identification signal, compared with the driving recorder directly connected with the vehicle fuse box through the voltage reduction line for power supply, the vehicle-mounted monitoring power supply can supply power to the driving recorder in the vehicle shutdown state, and prevents the vehicle storage battery from being over-discharged to cause the vehicle to be unable to start and the vehicle storage battery to be damaged.

[0043] The first output interface 71 further comprises a VCC terminal and a GND terminal, the ACC signal terminal of the first output interface 71 is connected with the ACC terminal of the input end of the voltage reduction line, the VCC terminal of the first output interface 71 is connected with the VCC terminal of the input end of the voltage reduction line, the GND terminal of the first output interface 71 is connected with the GND terminal of the input end of the voltage reduction line, the output end of the voltage reduction line comprises an ACC terminal, a VCC terminal and a GND terminal, the input end of the driving recorder comprises an ACC terminal, a VCC terminal and a GND terminal, the ACC terminal of the output end of the voltage reduction line is connected with the ACC terminal of the input end of the driving recorder, the VCC terminal of the output end of the voltage reduction line is connected with the VCC terminal of the input end of the driving recorder, and the GND terminal of the output end of the voltage reduction line is connected with the GND terminal of the input end of the driving recorder; the ACC identification signal output by the ACC signal terminal of the first output interface 71 is transmitted to the control module of the driving recorder through the voltage reduction line, the control module of the driving recorder judges whether the vehicle is in the shutdown state according to the ACC identification signal, and according to the judgment result, the driving recorder is controlled to enter or exit the parking monitoring mode.

[0044] The output interface 7 further comprises a second output interface 72, the second output interface 72 is a USB interface, and the driving recorder can be directly connected through the USB interface, so that the flexibility of the use occasion of the vehicle-mounted monitoring power supply is improved. The second output interface 72 is connected with a USB output module 9, and the USB output module 9 is connected with the BMS module 2 and the MCU module 4 respectively; after the vehicle is shutdown, the battery pack 1 outputs power through the BMS module 2, and the output power supplies power to the driving recorder through the USB output module 9 and the second output interface 72. The USB interface can be a USB-A, USB-C, USB-Micro or USB-Mini interface, and the USB interface can directly connect the driving recorder through a connecting line to supply power to the driving recorder.

[0045] The second output interface 72 also integrally has an ACC signal terminal for identifying the vehicle state, when the vehicle is in the start state, the ACC identification output signal is high level, when the vehicle is in the shutdown state, the ACC identification output signal is low level, and the high-low level identification result can be used to control the driving recorder to enter or exit the parking monitoring mode.

[0046] The USB output module 9 comprises an overcurrent protection circuit and a short circuit protection circuit, the USB output of the vehicle monitoring power supply can be turned off through the overcurrent protection circuit when the output current exceeds a preset value, and the USB output can be turned off through the short circuit protection circuit when a short circuit occurs, so as to prevent the vehicle monitoring power supply and the vehicle recorders from being damaged.

[0047] The DC-DC module 3 comprises an overvoltage detection circuit and an undervoltage detection circuit, the overvoltage detection circuit and the undervoltage detection circuit are used for detecting whether the charging voltage is higher or lower than a safety threshold, so as to prevent the vehicle monitoring power supply from being damaged due to the charging voltage being higher than the safety threshold, and the undervoltage detection circuit can prevent the vehicle battery from being over-discharged, that is, when the detection voltage is too low, the charging is stopped.

[0048] The vehicle monitoring power supply further comprises an LED display module 10, the LED display module 10 is electrically connected with the MCU module 4, and is used for displaying the electric quantity in the charging state or the discharging state.

[0049] The input interface 5 is provided with an ACC end, a VCC end and a GND end, the three ports are connected with the corresponding ports of the vehicle fuse box through connecting lines, so as to charge the vehicle monitoring power supply through the vehicle fuse box.

[0050] In the use process, the vehicle monitoring power supply can also be connected with the vehicle lighter through the input interface 5, when connected, the lighter connecting line 11 is used for connection, and the lighter connecting line 11 is connected with the vehicle lighter port through the input end, and the output end of the lighter connecting line 11 is connected with the corresponding ports of the input interface 5. Figure 2

[0051] Under the cooperation of the input interface and the lighter connecting line, the vehicle monitoring power supply can identify the charging type through the output end of the lighter connecting line, and the charging power of the vehicle monitoring power supply can be adjusted according to the identified charging type, so as to improve the charging speed of the vehicle monitoring power supply.

[0052] The working process of the vehicle monitoring power supply for the vehicle recorder is as follows:

[0053] ​In the process of vehicle driving, the vehicle fuse box or the vehicle cigarette lighter port is connected through the input interface and the connecting line (the vehicle fuse box connecting line or the cigarette lighter connecting line) for charging. According to the different connecting lines, the charging type can be identified through the ACC voltage of the input interface, and the charging power is automatically adjusted according to the identified charging type, so as to improve the charging speed. The DC-DC module outputs the constant voltage and constant current power required by the battery pack charging through the boost-buck circuit, and charges the battery pack through the BMS module. After the vehicle monitoring power is connected to the vehicle event data recorder through the first output interface and the voltage reduction line or connected to the vehicle event data recorder through the second output interface, the vehicle event data recorder can be provided with power. In the charging process, the ACC signal end of the first output interface and the second output interface outputs a high level identification signal, and after the ACC end of the input end of the vehicle event data recorder receives the high level identification signal, the high level identification signal is transmitted to the control module. After the control module receives the high level identification signal, the vehicle state is identified as the start / drive state, so as to control the vehicle event data recorder to exit the parking monitoring mode. After the vehicle is turned off, the DC-DC module stops charging, the battery pack outputs power through the BMS module, and the vehicle event data recorder is powered through the DC output module, the first output interface and the voltage reduction line, or powered through the USB output module and the second output interface. At this time, since the DC-DC module stops charging, the ACC signal end of the first output interface and the second output interface is turned off, the ACC signal end is at low level, and after the ACC end of the input end of the vehicle event data recorder detects the low level signal, the low level signal is transmitted to the control module. After the control module receives the low level signal, the vehicle state is identified as the off state, so as to control the vehicle event data recorder to enter the parking monitoring mode.

[0054] The working processes of connecting the vehicle fuse box and the vehicle cigarette lighter port are described below:

[0055] The VCC port of the vehicle fuse box has electricity in the start or off state of the vehicle, the ACC end of the vehicle fuse box is controlled by the ignition switch, and the vehicle has electricity when the vehicle is started / driven and is powered off when the vehicle is turned off. When the vehicle monitoring power is not connected to the vehicle fuse box, the initial voltage of the ACC end of the input interface 5 is about 5V.

[0056] When the vehicle is started, the ACC terminal of the vehicle fuse box outputs high level (i.e. the voltage of the vehicle battery, usually 12V for a passenger car and 24V for a truck), the initial voltage of the ACC terminal of the input interface of the vehicle monitoring power supply is raised to the voltage of the vehicle battery, and the vehicle monitoring power supply is connected to the vehicle fuse box by detecting the voltage of the ACC terminal of the input interface of the vehicle monitoring power supply, and the DC-DC module is controlled to charge the battery pack in a high-power fast charging mode; during the charging process, the ACC signal terminal of the output interface of the vehicle monitoring power supply outputs a high level recognition signal (the ACC output voltage of the first output interface is about 12V, and the ACC output voltage of the second output interface is about 5V), and the vehicle state is recognized as started / driving state by the vehicle recorders, and the vehicle recorders are controlled to exit the parking monitoring mode.

[0057] When the vehicle is stopped, the ACC port of the vehicle fuse box is turned off (i.e. in an open circuit state), the voltage of the ACC terminal of the input interface of the vehicle monitoring power supply is lowered to the initial voltage, and the vehicle monitoring power supply detects the voltage of the ACC terminal of the input interface to determine that the vehicle is stopped, and the DC-DC module is controlled to stop charging to prevent the vehicle battery from being over-discharged and causing the vehicle to be unable to start; after the DC-DC module stops charging, the ACC signal terminal of the output interface of the vehicle monitoring power supply is turned off, and the ACC signal terminal of the output interface is at low level (about 0V), and the control module of the vehicle recorders detects the low level signal to recognize that the vehicle is stopped, and the vehicle recorders are controlled to enter the parking monitoring mode.

[0058] The vehicle lighter port has no ACC signal, and the VCC power supply of the vehicle lighter port is controlled by the ignition switch, which is powered when the vehicle is started / driving and is powered off when the vehicle is stopped, and when the vehicle monitoring power supply is not connected to the vehicle lighter connection line, the initial voltage of the ACC terminal of the input interface is about 5V.

[0059] After the lighter connection line is connected to the vehicle monitoring power supply and the vehicle lighter port, the ACC terminal of the output end of the lighter connection line is connected to the GND terminal through a resistor, the ACC terminal of the input interface of the vehicle monitoring power supply is also connected to the GND terminal through this resistor, and the initial voltage of the ACC terminal of the input interface is lowered (the voltage of the ACC terminal of the input interface is about 1V), the vehicle monitoring power supply is connected to the vehicle lighter port for charging, and the DC-DC module is controlled to charge the battery pack in a low-power slow charging mode; during the charging process, the ACC signal terminal of the output interface of the vehicle monitoring power supply outputs a high level recognition signal (the ACC output voltage of the first output interface is about 12V, and the ACC output voltage of the second output interface is about 5V), and the vehicle state is recognized as started / driving state by the vehicle recorders, and the vehicle recorders are controlled to exit the parking monitoring mode.

[0060] When the vehicle is turned off, the VCC of the vehicle cigarette lighter port has no voltage output, the vehicle cigarette lighter port stops supplying power, and the DC-DC module closes the charging; at the output interface, the ACC is turned off, the ACC signal end of the output interface is at a low level (about 0V), and after the control module of the vehicle event data recorder detects the low level signal, it is identified that the vehicle is in the off state, and the control module controls the vehicle event data recorder to enter the parking monitoring mode.

[0061] It should be noted that the initial voltage value of the ACC end of the input interface of the vehicle monitoring power supply when the input interface is not connected to the vehicle fuse box or the cigarette lighter connection line is only for reference, and the specific initial voltage value can be set as needed; after the input interface of the vehicle monitoring power supply is connected to the output end of the cigarette lighter connection line, the specific value of the initial voltage of the ACC end of the input interface after reduction is also only for reference, and the specific value after reduction can be determined according to the circuit design and the specific specifications of the resistor. Similarly, the high level voltage value and the low level voltage value of the ACC signal end of the first output interface or the second output interface are also only for reference, and the specific voltage values can be set as needed.

[0062] The above is only a detailed description of the specific implementation of the present application, and is not a limitation of the present application. Various substitutions, modifications and improvements made by those skilled in the related technical field without departing from the principles and scope of the present application shall be included in the protection scope of the present application.

Claims

1. A vehicle monitoring power supply for a vehicle event data recorder, characterized by, The application relates to a vehicle-mounted monitoring power supply. The vehicle-mounted monitoring power supply comprises a battery group for providing electric energy for a vehicle record device; a BMS module connected with the battery group and an MCU module respectively, for monitoring and managing the working state of the battery group; a DC-DC module connected with the BMS module and the MCU module respectively, for providing a constant-current constant-voltage power supply required by the battery group; the MCU module for controlling the working state of the vehicle-mounted monitoring power supply; an input interface connected with the DC-DC module, for connecting a vehicle safety box or a vehicle lighter; a DC output module connected with the BMS module and the MCU module respectively, for connecting the vehicle record device through an output interface and a voltage reduction line; an output interface comprising a first output interface connected with the DC output module, wherein the first output interface comprises an ACC signal end for identifying the state of the vehicle, so that the vehicle record device can determine whether the vehicle is in a shutdown state, and the vehicle record device can enter or exit a parking monitoring mode; and a switch connected with the MCU module, for controlling the opening or closing state of the vehicle-mounted monitoring power supply. The first output interface further comprises a VCC end and a GND end, the ACC signal end of the first output interface is connected with the ACC end of the input end of the voltage reduction line, the VCC end of the first output interface is connected with the VCC end of the input end of the voltage reduction line, the GND end of the first output interface is connected with the GND end of the input end of the voltage reduction line, the output end of the voltage reduction line comprises an ACC end, a VCC end and a GND end, the input end of the vehicle record device comprises an ACC end, a VCC end and a GND end, and the output end of the voltage reduction line is connected with the input end of the vehicle record device. The output interface further comprises a second output interface, the second output interface is connected with a USB output module, the USB output module is connected with the BMS module, and the USB output module is further connected with the MCU module. The second output interface is a USB interface, and the USB interface adopts a USB-A, USB-C, USB-Micro or USB-Mini interface. The second output interface is integrated with an ACC signal end for identifying the state of the vehicle. The DC output module comprises an overcurrent protection circuit and a short-circuit protection circuit. The DC-DC module comprises an overvoltage detection circuit and an undervoltage detection circuit. The vehicle-mounted monitoring power supply further comprises an LED display module for displaying the electric quantity, and the LED display module is electrically connected with the MCU module.

2. The on-board monitor power supply according to claim 1, characterized in that The input interface is connected with a vehicle lighter port through a lighter connecting line, the output end of the lighter connecting line is provided with an ACC end, a VCC end and a GND end, and the ACC end of the output end of the lighter connecting line is connected with the GND end through a resistor.

3. The vehicle monitoring power supply of claim 1, wherein ​ 4. The vehicle monitoring power supply of claim 3, wherein ​ 5. The vehicle monitoring power supply of claim 3, wherein, ​ 6. The vehicle monitoring power supply of claim 3, wherein ​ 7. The vehicle monitoring power supply of claim 1, wherein ​ 8. The vehicle monitoring power supply of claim 1, wherein, ​ 9. The vehicle monitoring power supply of claim 1, wherein, ​

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