Power supply circuit and automobile data recorder

Abstract

The embodiment of the utility model discloses a power supply circuit and an automobile data recorder, the power supply circuit comprises a first one-way conduction piece, a super capacitor, a second one-way conduction piece and a first switch module, the first one-way conduction piece is arranged between an external power supply end and an output end, and the super capacitor is connected with the external power supply end and the output end; the second one-way conduction piece is arranged between the external power supply end and the super capacitor; the first switch module is arranged between the super capacitor and the output end, the controlled end of the first switch module is connected with the system power supply end, and when the external power supply end is powered off, the system power supply end is powered off; when the external power supply end is powered off, the first switch module is switched on, and the super capacitor supplies power to the output end. According to the embodiment of the invention, the recorder is provided with the super capacitor, and the power supply circuit can supply power to the recorder body for a short time when the vehicle flames out and is powered off, so that the recorder body can complete a shutdown process, and the probability of damage of video files is reduced.

Description

Technical Field

[0001] This application relates to the technical field of driving recorders, and in particular, to a power supply circuit and a driving recorder. Background Art

[0002] A driving recorder is mainly used to record images, sounds, vehicle conditions and other data during vehicle driving. In related technologies, the driving recorder does not have its own battery, so it needs to be powered on in the vehicle during normal operation. When the vehicle is turned off and the power is cut off, the driving recorder may cause damage to the video file because it is too late to save the data. Summary of the Utility Model

[0003] An embodiment of this application provides a power supply circuit and a driving recorder. When the vehicle is turned off and the power is cut off, the power supply circuit can supply power to the recorder body for a short time, so that the recorder body can complete the shutdown process and reduce the probability of damage to the video file.

[0004] In a first aspect, an embodiment of this application provides a power supply circuit applied to a driving recorder. The power supply circuit includes a first one-way conduction component, a super capacitor, a second one-way conduction component, and a first switch module. The first one-way conduction component is arranged between an external power supply terminal and an output terminal. The external power supply terminal is used to provide electric energy, and the output terminal is used to connect to a load. The super capacitor is connected to the external power supply terminal and the output terminal. The second one-way conduction component is arranged between the external power supply terminal and the super capacitor. The first switch module is arranged between the super capacitor and the output terminal. The controlled end of the first switch module is connected to a system power supply terminal. When the external power supply terminal is powered off, the system power supply terminal is powered off. Among them, when the external power supply terminal is energized, the first switch module is turned off, and the external power supply terminal supplies power to the output terminal. When the external power supply terminal is powered off, the first switch module is turned on, and the super capacitor supplies power to the output terminal.

[0005] In some exemplary embodiments, the first switch module includes: a first capacitor, the first end of the first capacitor is connected to the system power supply terminal, and the second end of the first capacitor is grounded; a first switch component, the controlled end of the first switch component is connected to the first end of the first capacitor, and the output end of the first switch is grounded; a second switch component, the controlled end of the second switch component is connected to the input end of the first switch, the input end of the second switch component is connected to the super capacitor, and the output end of the second switch component is connected to the output terminal.

[0006] In some exemplary embodiments, the first switch module further includes: a first voltage-dividing resistor, a first end of the first voltage-dividing resistor is connected to the external power supply terminal; a second voltage-dividing resistor, a first end of the second voltage-dividing resistor is connected to a second end of the first voltage-dividing resistor, and a second end of the second voltage-dividing resistor is grounded; a third switching element, a controlled end of the third switching element is connected to the first end of the second voltage-dividing resistor, an input end of the third switching element is connected to an output end of the second switching element, and an output end of the third switching element is connected to the output terminal.

[0007] In some exemplary embodiments, the power supply duration of the super capacitor is 4 seconds to 6 seconds.

[0008] In some exemplary embodiments, the power supply circuit further includes: a first current-limiting resistor, disposed between the first unidirectional conduction element and the super capacitor; a second current-limiting resistor, connected in parallel with the first current-limiting resistor.

[0009] In some exemplary embodiments, the power supply circuit further includes: a second switch module, a controlled end of the second switch module is connected to the system power supply terminal, an input end of the second switch module is connected to the super capacitor, an output end of the second switch module is connected to a detection terminal, and the detection terminal is used to detect the voltage of the super capacitor.

[0010] In some exemplary embodiments, the second switch module includes: a fourth switching element, a controlled end of the fourth switching element is connected to the system power supply terminal, and an output end of the fourth switching element is grounded; a fifth switching element, a controlled end of the fifth switching element is connected to an input end of the fourth switching element, an input end of the fifth switching element is connected to the super capacitor, and an output end of the fifth switching element is connected to the detection terminal.

[0011] In some exemplary embodiments, the second switch module further includes: a third voltage-dividing resistor, a first end of the third voltage-dividing resistor is connected to the output end of the fifth switching element; a fourth voltage-dividing resistor, a first end of the fourth voltage-dividing resistor is connected to a second end of the third voltage-dividing resistor and the detection terminal, and a second end of the fourth voltage-dividing resistor is grounded.

[0012] In some exemplary embodiments, the power supply circuit further includes: a filtering module, connected to the output terminal, for filtering the output terminal.

[0013] In a second aspect, an embodiment of the present application provides a driving recorder, which includes a power supply circuit, a first connection terminal, and a power management module. The first connection terminal is connected to the external power supply terminal; the power management module is connected to the output terminal, and the power management module is used to output multiple power supplies.

[0014] Beneficial effects: The embodiment of the present application has a super capacitor. When the vehicle is turned off and powered off, the power supply circuit can supply power to the recorder body for a short time, so that the recorder body can complete the shutdown process and reduce the probability of video file damage. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 Structural schematic diagram of the recorder body and vehicle accessories in an embodiment of the present application;

[0017] Figure 2 Structural schematic diagram of the recorder body in an embodiment of the present application;

[0018] Figure 3 Structural schematic diagram of the combination of the recorder body and vehicle accessories in another embodiment of the present application;

[0019] Figure 4 Structural schematic diagram of the battery compartment in an embodiment of the present application;

[0020] Figure 5 Structural schematic diagram of the combination of the recorder body and the battery compartment in an embodiment of the present application;

[0021] Figure 6 Structural schematic diagram of the combination of the recorder body and the battery compartment in another embodiment of the present application;

[0022] Figure 7 Block diagram of the recorder body in an embodiment of the present application;

[0023] Figure 8 Block diagram of the battery compartment in an embodiment of the present application;

[0024] Figure 9 Pin schematic diagram of the connection terminal or mating terminal in an embodiment of the present application;

[0025] Figure 10 Pin schematic diagram of the external terminal in an embodiment of the present application;

[0026] Figure 11 Block diagram of the recorder body in another embodiment of the present application;

[0027] Figure 12 Block diagram of the power supply circuit in an embodiment of the present application;

[0028] Figure 13 Partial circuit schematic diagram of a power supply circuit in an embodiment of the present application;

[0029] Figure 14 Partial circuit schematic diagram of a power supply circuit in another embodiment of the present application;

[0030] Figure 15 Block diagram of a power supply circuit in another embodiment of the present application;

[0031] Figure 16 Partial circuit schematic diagram of a power supply circuit in yet another embodiment of the present application;

[0032] Figure 17 Block diagram of a battery compartment in another embodiment of the present application;

[0033] Figure 18 Circuit schematic diagram of a protection circuit and a boost module in yet another embodiment of the present application;

[0034] Figure 19 Block diagram of a battery compartment in yet another embodiment of the present application;

[0035] Figure 20 Circuit schematic diagram of a switching module in an embodiment of the present application.

[0036] Explanation of reference numerals: 10, driving recorder;

[0037] 100, recorder body; 110, first housing; 120, camera; 130, main display screen; 140, control module; 150, connection terminal; 151, first data pin; 152, first power supply pin; 153, first display pin; 154, detection pin; 160, WiFi module; 170, voice module; 190, power management module;

[0038] 200, vehicle accessory;

[0039] 300, battery compartment; 310, second housing; 320, battery compartment display screen; 330, battery; 340, mating terminal; 341, second data pin; 342, second power supply pin; 343, second display pin; 344, signal pin; 350, external terminal; 351, third data pin; 352, third power supply pin; 360, fast charging module; 370, boost module; 380, protection circuit; U5, voltage detection component; Q2, first protection switch; Q1, second protection switch; U3, boost chip; L3, power inductor; D4, power diode; 390, switching module; U4, switching chip; R24, first resistor; R2, second resistor;

[0040] 400, power supply circuit; 410, first unidirectional conduction component; 420, super capacitor; 430, second unidirectional conduction component; 440, first switch module; C1, first capacitor; Q5, first switch component; Q4, second switch component; R12, first voltage dividing resistor; R17, second voltage dividing resistor; Q1, third switch component; 450, second switch module; Q7, fourth switch component; Q6, fifth switch component; R32, third voltage dividing resistor; R35, fourth voltage dividing resistor; 460, filtering module; 471, external power supply terminal; 472, output terminal; 473, system power supply terminal; 474, detection terminal; R18, first current limiting resistor; R19, second current limiting resistor. Detailed implementation manners

[0041] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] As Figures 1 - 3 shown, in the first aspect of the embodiment of the present application, a driving recorder 10 is provided. The driving recorder 10 includes a recorder body 100 and a vehicle accessory 200.

[0043] The recorder body 100 is used to record video recordings, emergency recordings, photos, etc. during driving. The vehicle accessory 200 is used to be electrically connected to the power supply component of the vehicle, and the vehicle accessory 200 can be electrically connected to the recorder body 100, so that the vehicle supplies power to the recorder body 100 through the vehicle accessory 200. Exemplarily, the power supply component in the vehicle can be, for example, a vehicle charger, a step-down wire, etc. The vehicle accessory 200 can be connected to the vehicle charger or the vehicle step-down wire. Generally speaking, the vehicle charger is arranged on the panel of the vehicle interior, and the connection between the vehicle accessory 200 and the vehicle charger is relatively simple and convenient. The vehicle step-down wire is relatively more concealed, so that the wiring of the driving recorder 10 is more concealed, the wiring inside the vehicle is cleaner, and at the same time, it does not need to occupy the charging interface.

[0044] An in-vehicle charger can be, for example, a cigarette lighter, a USB interface, etc. It should be noted that the USB interface in the vehicle is indirectly powered by the car battery. The output voltage of the USB interface is usually 5V, while the output voltage of the car battery is usually 12V. Therefore, a step-down wire needs to be set between the car battery and the USB interface to reduce the 12V voltage to about 5V. The step-down wire usually includes a positive wire, a ground wire, and an ACC wire. The positive wire is used for power supply, the negative wire is used for grounding, and the ACC wire is used to reflect the ignition state of the vehicle. The positive wire of the step-down wire is connected to the car battery, and the positive wire of the step-down wire is a constant power supply, that is, regardless of whether the vehicle is turned off or not, the positive wire of the step-down wire is charged. To avoid the load connected to the in-vehicle charger draining the power of the car battery when the vehicle is turned off, the in-vehicle charger usually connects the ACC wire. When the vehicle is started, the ACC wire is at a high level and the in-vehicle charger is powered on. When the vehicle is turned off, the ACC wire is at a low level and the in-vehicle charger is powered off.

[0045] When the vehicle accessory 200 is connected to the in-vehicle charger, since the in-vehicle charger itself can be controlled through the ACC wire, the recorder body 100 can start and stop with the vehicle. Specifically, when the vehicle is ignited, the in-vehicle charger is powered on and the recorder body 100 is turned on; when the vehicle is turned off, the in-vehicle charger is powered off and the recorder body 100 is turned off.

[0046] When the vehicle accessory 200 is connected to the in-vehicle step-down wire, the recorder body 100 can control the start and stop according to the level signal of the ACC wire, or can be turned off after the vehicle has been turned off for a period of time.

[0047] As Figures 4 - 6 shown, in some embodiments, the driving recorder 10 further includes a battery compartment 300 for storing electrical energy, and the battery compartment 300 can be electrically connected to the recorder body 100. The battery compartment 300 and the recorder body 100 are separately arranged. The recorder body 100 can be used alone without the battery compartment 300, or can be used in combination with the battery compartment 300.

[0048] Correspondingly, the recorder body 100 has a driving mode and a mobile mode, and the settings for shooting videos are different when the recorder body 100 is in different modes. Exemplarily, when the recorder body 100 is in the driving mode, due to the limited memory space, the previous regular videos will be overwritten, and only some special videos such as emergency videos and user-marked videos will be retained. When the recorder body 100 is in the mobile mode, most of the videos and photos taken are those needed by the user, so the taken videos and photos will not be overwritten and deleted. Or, when the recorder body 100 is in the driving mode, the clarity of the video is prioritized, and when the recorder body 100 is in the mobile mode, the color accuracy of the video is prioritized. Of course, other parameter settings can be adjusted, which are not limited here.

[0049] When the recorder main body 100 is electrically connected to the vehicle accessory 200, the recorder main body 100 is in the driving mode, and the vehicle supplies power to the recorder main body 100. When the recorder main body 100 is electrically connected to the battery compartment 300, the recorder main body 100 is in the mobile mode, and the battery compartment 300 can supply power to the recorder main body 100 so that the recorder main body 100 can take pictures away from the vehicle.

[0050] Since the recorder main body 100 can be selectively connected to the vehicle accessory 200 or the battery compartment 300, the driving recorder 10 of the embodiment of the present application can not only be placed on the vehicle to record driving videos, but also be used as a mobile camera away from the vehicle, thus having relatively rich functions.

[0051] In some embodiments, as Figures 1 - 2 shown, the recorder main body 100 includes a first housing 110, a camera 120 and a main body display screen 130. The first housing 110 has a first surface and a second surface arranged opposite to each other. The camera 120 is arranged on the first surface, and the main body display screen 130 is arranged on the second surface. As Figure 3 shown, when the vehicle accessory 200 is combined with the recorder main body 100, the driving video can be observed in real time or the driving video can be played back through the main body display screen 130.

[0052] As Figure 4 shown, the battery compartment 300 includes a second housing 310 and a battery compartment display screen 320 arranged on the second housing 310. The battery compartment display screen 320 is driven by the recorder main body 100. As Figure 5 shown, when the battery compartment 300 is combined with the recorder main body 100, the video content of the shot can be observed in real time through the main body display screen 130. As Figure 6 shown, when the battery compartment 300 is combined with the recorder main body 100, the orientation of the battery compartment display screen 320 is the same as the orientation of the camera 120. The user can switch to display the video content of the shot by the main body display screen 130 or by the battery compartment display screen 320, so as to facilitate self-shooting.

[0053] As Figure 7 shown, in some embodiments, the recorder main body 100 includes a WiFi module 160. The control module 140 is connected to the WiFi module 160. The WiFi module 160 is used to connect to a mobile phone. The user can access the video data and photo data stored in the recorder main body 100 through a mobile phone app. Optionally, the WiFi module 160 supports WiFi6, so as to have a relatively high transmission speed.

[0054] As Figure 7As shown, in some embodiments, the recorder body 100 includes a voice module 170. The control module 140 is connected to the voice module 170, and the voice module 170 is used to convert the user's voice into an operation instruction. The user can control the operation of the recorder body 100 by speaking a wake-up word. For example, commonly used ones such as "I want to take a photo", "I want to record a video", "Capture a photo", "Turn on the screen", "Turn off the screen", etc.

[0055] As Figure 8 shown, in some embodiments, the battery compartment 300 includes a boost module 370. The boost module 370 is connected between the battery 330 and the second power supply pin 342. The voltage of the battery 330 is usually different from the power supply voltage of the recorder body 100. Therefore, by setting the boost module 370, the output voltage of the battery compartment 300 can provide the voltage required by the recorder body 100.

[0056] As Figures 7 - 8 shown, in some embodiments, the recorder body 100 includes a control module 140 and a connection terminal 150 electrically connected to the control module 140. The connection terminal 150 includes a detection pin 154.

[0057] The battery compartment 300 includes a battery 330 and a mating terminal 340 electrically connected to the battery 330. The mating terminal 340 can be plugged and mated with the connection terminal 150. The connection terminal 150 can be exemplarily a USB-C female port, and the mating terminal 340 can be exemplarily a USB-C male port. The capacity of the battery 330 can be exemplarily 1700 mAh. When the mating terminal 340 is plugged into the connection terminal 150, the potential of the detection pin 154 changes, and the control module 140 can switch the mode of the recorder body 100 according to the potential of the detection pin 154. For example, as Figure 8 shown, the mating terminal 340 includes a signal pin 344. The signal pin 344 is connected to the battery 330. When the mating terminal 340 is plugged into the connection terminal 150, the signal pin 344 abuts against the detection pin 154, and the detection pin 154 changes from a low potential to a high potential.

[0058] In some embodiments, the battery compartment 300 is detachably connected to the recorder body 100. Exemplarily, the battery compartment 300 is snap-connected to the recorder body 100. When the battery compartment 300 is connected to the recorder body 100, the connection terminal 150 is plugged and mated with the mating terminal 340, so as to realize the electrical connection between the two while realizing the physical connection between the battery compartment 300 and the recorder, making the assembly more convenient.

[0059] As Figures 7 - 8As shown, in some embodiments, the connection terminal 150 includes a first data pin 151, the mating terminal 340 includes a second data pin 341, the battery compartment 300 further includes an external terminal 350, the external terminal 350 includes a third data pin 351, the second data pin 341 is electrically connected to the third data pin 351, and when the connection terminal 150 is plugged into the mating terminal 340, the first data pin 151 is electrically connected to the second data pin 341. When the battery compartment 300 is connected to the recorder body 100, a computer can read data such as photos and videos in the recorder body through the terminal connecting the battery compartment 300, so that it is not necessary to separate the battery compartment 300 from the recorder body 100, facilitating data transmission when the battery compartment 300 and the recorder body 100 are combined.

[0060] As Figures 7 - 8 shown, in some embodiments, the connection terminal 150 includes a first power supply pin 152, the mating terminal 340 includes a second power supply pin 342, and when the connection terminal 150 is plugged into the mating terminal 340, the first power supply pin 152 abuts against the second power supply pin 342, so that the battery 330 can supply power to the recorder body 100. Optionally, the recorder body 100 further includes a power management module 190, the power management module 190 is connected to the first power supply pin 152, and the power management module 190 can output multiple power supplies to supply power to different components of the recorder body 100. Figure 7 Only the power supply of the control module 140 by the power management module 190 is schematically shown in the figure. Actually, the power management module 190 can also supply power to the camera 120, the host display screen 130, the WiFi module 160, the voice module 170, etc.

[0061] The external terminal 350 includes a third power supply pin 352, the battery compartment 300 includes a fast charging module 360, and the fast charging module 360 is connected between the third power supply pin 352 and the battery 330.

[0062] When the battery compartment 300 is not combined with the recorder body 100, that is, when the first power supply pin 152 is disconnected from the second power supply pin 342, the fast charging module 360 can operate and can fast charge the battery 330, thereby increasing the charging speed of the battery compartment 300.

[0063] When the first power supply pin 152 is connected to the second power supply pin 342, the fast charging module 360 stops operating.

[0064] As Figures 7 - 8As shown, in some embodiments, the connection terminal 150 includes a first display pin 153, the mating terminal 340 includes a second display pin 343, the battery compartment 300 further includes a battery compartment display screen 320, the battery compartment display screen 320 is connected to the second display pin 343, and the control module 140 can transmit the video data of the battery compartment display screen 320 through the connection terminal 150 so that the battery compartment display screen 320 displays a corresponding picture. In the embodiments of the present application, the connection terminal 150 can transmit the video data of the battery compartment display screen 320, supply power to the recorder body 100, and transmit the video data in the recorder body 100, with high integration and convenience.

[0065] Exemplarily, the pin schematic diagram of the connection terminal 150 or the mating terminal 340 can refer to Figure 9 , Figure 9 In it, the pin A11 is used to detect whether the recorder body 100 is connected to the battery compartment 300. If the battery compartment 300 is connected, the pin A11 is at a high level; if the battery compartment 300 is not connected, the pin A11 is at a low level.

[0066] The pins B11, B10, A2, A3, B8, and B3 are the signal transmission pins of the battery compartment display screen 320. The pins A6, A7, B6, and B7 are the data transmission pins.

[0067] Exemplarily, the pin schematic diagram of the external terminal 350 can refer to Figure 10 , Figure 10 Compared with the pins in Figure 11 , the pins B11, B10, A2, A3, B8, and B3, which are the 6 signal transmission pins of the battery compartment display screen 320, are missing.

[0068] As Figure 11 shown, in the second aspect of the embodiments of the present application, a recorder body 100 is provided. The recorder body 100 includes a power supply circuit 400, and the power supply circuit 400 is electrically connected to the connection terminal 150. Specifically, the power supply circuit 400 is electrically connected to the first power supply pin 152. When the vehicle shuts off and loses power, the recorder body 100 may cause damage to the video file because it is too late to save the data. In this embodiment, by setting the power supply circuit 400, when the vehicle shuts off and loses power, the power supply circuit 400 can supply power to the recorder body 100 for a short time so that the recorder body 100 can complete the shutdown process and reduce the probability of video file damage. When the vehicle ignites and supplies power, the first power supply pin 152 can charge the power supply circuit 400 for use in the next shutdown.

[0069] As Figure 12As shown, the power supply circuit 400 includes a first unidirectional conduction component 410, a super capacitor 420, a second unidirectional conduction component 430, and a first switch module 440.

[0070] The first unidirectional conduction component 410 is disposed between the external power supply terminal 471 and the output terminal 472. The external power supply terminal 471 is used to supply electrical energy, and the output terminal 472 is used to connect to a load. Under normal circumstances, the external power supply terminal 471 supplies power to the output terminal 472, and the first unidirectional conduction component 410 can prevent the current at the output terminal 472 from flowing back to the external power supply terminal 471. Exemplarily, the external power supply terminal 471 is connected to the first power supply pin 152, and the output terminal 472 is connected to the power management module 190.

[0071] The super capacitor 420 is connected to the external power supply terminal 471 and the output terminal 472. The second unidirectional conduction component 430 is disposed between the external power supply terminal 471 and the super capacitor 420. The first switch module 440 is disposed between the super capacitor 420 and the output terminal 472. The controlled terminal of the first switch module 440 is connected to the system power supply terminal 473. When the external power supply terminal 471 loses power, the system power supply terminal 473 also loses power. The super capacitor 420 has a long charge-discharge cycle life, is not prone to spontaneous combustion, and can withstand high temperatures. Exemplarily, the system power supply terminal 473 is output by the power management module 190. The voltage of the external power supply terminal 471 is 5V, and the voltage of the system power supply terminal 473 is 3.3V.

[0072] When the external power supply terminal 471 is powered on, the first switch module 440 is turned off. The external power supply terminal 471 supplies power to the output terminal 472, and the external power supply terminal 471 can also charge the super capacitor 420. When the external power supply terminal 471 loses power, the first switch module 440 is turned on, and the super capacitor 420 supplies power to the output terminal 472.

[0073] Exemplarily, Figure 13 in which VBUS serves as the external power supply terminal 471, PWR serves as the output terminal 472, and the external power supply terminal 471 supplies power to the output terminal 472 through the diode D1. Figure 14 Another path of VBUS is connected to the contact point CAP-VOT through the diode D2, and the super capacitor 420 is powered through the contact point CAP-VOT. When the first switch module 440 is turned on, the super capacitor 420 can supply power to PWR through CAP-VOT.

[0074] As Figure 14 shown, in some embodiments, the first switch module 440 includes a first capacitor C1, a first switch component Q5, and a second switch component Q4.

[0075] The first end of the first capacitor C1 is connected to the system power supply terminal 473, and the second end of the first capacitor C1 is grounded; the controlled end of the first switch Q5 is connected to the first end of the first capacitor C1, and the output terminal 472 of the first switch is grounded; the controlled end of the second switch Q4 is connected to the input end of the first switch, the input end of the second switch Q4 is connected to the super capacitor 420, and the output terminal 472 of the second switch Q4 is connected to the output terminal 472.

[0076] When the external power supply terminal 471 is powered off, the system power supply terminal 473 is powered off. At this time, the first capacitor C1 discharges, so that the first switch Q5 is turned on, and then the second switch Q4 is turned on. At this time, the super capacitor 420 can be connected to the output terminal 472 to supply power to the output terminal 472.

[0077] In some embodiments, the first switch module 440 further includes a first voltage dividing resistor R12, a second voltage dividing resistor R17 and a third switch Q1. The setting of the third switch Q1 can further prevent the current at the output terminal 472 from flowing back to the super capacitor 420.

[0078] Specifically, the first end of the first voltage dividing resistor R12 is connected to the external power supply terminal 471, the first end of the second voltage dividing resistor R17 is connected to the second end of the first voltage dividing resistor R12, the second end of the second voltage dividing resistor R17 is grounded, the controlled end of the third switch Q1 is connected to the first end of the second voltage dividing resistor R17, the input end of the third switch Q1 is connected to the output terminal 472 of the second switch Q4, and the output terminal 472 of the third switch Q1 is connected to the output terminal 472.

[0079] In some embodiments, the power supply duration of the super capacitor 420 is 4 seconds - 6 seconds. If the power supply duration of the super capacitor 420 is too long, a larger super capacitor 420 for power-off needs to be set, resulting in high cost. If the power supply duration of the super capacitor 420 is too short, it may cause the recorder body 100 to not have enough time to complete the shutdown process and the video retention fails. In this embodiment, the capacity of the super capacitor 420 is relatively appropriate, enabling the recorder body 100 to complete the shutdown process, and making the capacity of the super capacitor 420 relatively small, thus saving cost and space occupancy.

[0080] As Figure 14 shown, in some embodiments, the power supply circuit 400 further includes a first current limiting resistor R18 and a second current limiting resistor R19. The first current limiting resistor R18 is arranged between the first one-way conduction component 410 and the super capacitor 420, and the second current limiting resistor R19 is connected in parallel with the first current limiting resistor R18. The first current limiting resistor R18 and the second current limiting resistor R19 mainly control the charging power consumption of the super capacitor 420 and limit the current when the super capacitor 420 is charging. The setting of two resistors can reduce heat generation.

[0081] AsFigure 15 As shown, in some embodiments, the power supply circuit 400 further includes a filtering module 460, which is connected to the output terminal 472 and is used to filter the output terminal 472 to make the power supply at the output terminal 472 purer. The filtering module 460 may refer to Figure 13 capacitor C394, capacitor C3, and capacitor C2 in

[0082] As Figure 15 shown, in some embodiments, the power supply circuit 400 further includes a second switch module 450. The controlled end of the second switch module 450 is connected to the system power supply terminal 473, the input end of the second switch module 450 is connected to the super capacitor 420, and the output terminal 472 of the second switch module 450 is connected to the detection terminal 474. The detection terminal 474 is used to detect the voltage of the super capacitor 420 in real time and monitor whether the state of the super capacitor 420 is normal.

[0083] As Figure 16 shown, in some embodiments, the second switch module 450 includes a fourth switch element Q7 and a fifth switch element Q6. The controlled end of the fourth switch element Q7 is connected to the system power supply terminal 473, and the output terminal 472 of the fourth switch element Q7 is grounded. The controlled end of the fifth switch element Q6 is connected to the input end of the fourth switch element Q7. The input end of the fifth switch element Q6 is connected to the super capacitor 420, and the output terminal 472 of the fifth switch element Q6 is connected to the detection terminal 474. The detection terminal 474 is Figure 16 the VCAP-ADC in

[0084] When the system power supply terminal 473 is powered off, the second switch module 450 is powered off, thereby preventing the detection terminal 474 from consuming the power of the super capacitor 420, so that the power of the super capacitor 420 can be supplied to the recorder body 100. Figure 16 shown, in some embodiments, the second switch module 450 further includes a third voltage dividing resistor R32 and a fourth voltage dividing resistor R35. The first end of the third voltage dividing resistor R32 is connected to the output terminal 472 of the fifth switch element Q6. The first end of the fourth voltage dividing resistor R35 is connected to the second end of the third voltage dividing resistor R32 and the detection terminal 474, and the second end of the fourth voltage dividing resistor R35 is grounded. By first reducing the voltage of the super capacitor 420 and then measuring it, the out-of-range situation is avoided.

[0085] As Figure 17As shown in the figure, in the third aspect of the embodiments of the present application, a battery compartment 300 is provided. The battery compartment 300 is used to supply power to the recorder body 100 after being combined with the recorder body 100. The battery compartment 300 includes a mating terminal 340, a battery 330, and a battery compartment display screen 320. The mating terminal 340 is used to connect to the recorder body 100; the battery 330 is connected to the mating terminal 340; the battery compartment display screen 320 is connected to the mating terminal 340, and the battery compartment display screen 320 is used for self-timer; wherein, when the battery compartment 300 is connected to the recorder body 100, the battery 330 supplies power to the recorder body 100 through the mating terminal 340, and the recorder body 100 can control the battery compartment display screen 320 through the mating terminal 340.

[0086] As Figure 17 shown, in some embodiments, the battery compartment 300 further includes a protection circuit 380. The protection circuit 380 is used to protect the battery 330 and prevent the battery 330 from over-discharging. The protection circuit 380 is connected between the battery 330 and the mating terminal 340. When the voltage of the battery 330 is lower than the preset voltage, the protection circuit 380 is disconnected. When the voltage of the battery 330 is higher than the preset voltage, the protection circuit 380 is turned on. For example, when the voltage of the battery 330 is lower than 3.3V, the protection circuit 380 is disconnected, and the battery 330 stops supplying power, thereby protecting the battery 330 and extending the service life of the battery 330.

[0087] As Figure 18 shown, in some embodiments, the protection circuit 380 includes a voltage detection component U5, a first protection switch Q2, and a second protection switch Q1. The input end of the voltage detection component U5 is connected to the battery 330, and the ground end of the voltage detection component U5 is grounded; the controlled end of the first protection switch Q2 is connected to the output end 472 of the voltage detection component U5, and the output end 472 of the first protection switch Q2 is grounded; the controlled end of the second protection switch Q1 is connected to the input end of the first protection switch Q2, the input end of the second protection switch Q1 is connected to the battery 330, and the output end 472 of the second protection switch Q1 is connected to the mating terminal 340. When the voltage detection component U5 detects that the voltage of the VDD pin is lower than 3.3V, the OUT pin of the voltage detection component U5 outputs a low level, so that the first protection switch Q2 is turned off and the second protection switch Q1 is turned off, and the battery 330 stops supplying power.

[0088] As Figure 17 shown, in some embodiments, the battery compartment 300 further includes a boost module 370. The boost module 370 is connected between the protection circuit 380 and the mating terminal 340.

[0089] As Figure 18As shown, in some embodiments, the boost module 370 includes a boost chip U3, a power inductor L3, and a power diode D4. The input terminal of the boost chip U3 is connected to the protection circuit 380, and the output terminal 472 of the boost chip U3 is connected to the mating terminal 340. The power inductor L3 is disposed between the input terminal and the output terminal 472 of the boost chip U3. The anode of the power diode D4 is connected to the output terminal 472 of the boost chip U3, and the cathode is connected to the mating terminal 340. The model of the boost chip U3 can be exemplarily LP6222SPF.

[0090] As Figure 17 shown, in some embodiments, the battery compartment 300 further includes a fast charging module 360, and the fast charging module 360 is disposed between the battery 330 and the mating terminal 340. The chip model of the fast charging module 360 can be exemplarily IP2315.

[0091] As Figure 19 shown, in some embodiments, the battery compartment 300 further includes a switching module 390 and an external terminal 350. The input terminal of the switching module 390 is connected to the external terminal 350, and the output terminal 472 of the switching module 390 is connected to the fast charging module 360 and the mating terminal 340. The switching module 390 can connect the external terminal 350 to the mating terminal 340 or connect the external terminal 350 to the fast charging module 360.

[0092] As Figure 20 shown, in some embodiments, the switching module 390 includes a switching chip U4. The input terminal of the switching chip U4 is connected to the external terminal 350, and the output terminal 472 of the switching chip U4 is connected to the fast charging module 360 and the mating terminal 340. The control pin of the switching chip U4 is connected to the system power supply terminal 473.

[0093] When the battery compartment 300 is combined with the recorder body 100, the system power supply terminal 473 is at a high level, and the external terminal 350 is connected to the mating terminal 340 through the switching chip U4. When the battery compartment 300 is separated from the recorder body 100, the system power supply terminal 473 is at a low level, and the external terminal 350 is connected to the fast charging module 360 through the switching chip U4. Specifically, when the SEL pin of the switching chip U4 detects a high level, the pin D+ is connected to the pin D2+, and the pin D- is connected to the pin D2-. At this time, data can be transmitted. When the SEL pin of the switching chip U4 detects a low level, the pin D+ is connected to the pin DP, and the pin D- is connected to the pin DM. At this time, the battery can be fast charged.

[0094] As Figure 20As shown, in some embodiments, the switching module 390 further includes a first resistor R24 and a second resistor R2. The first end of the first resistor R24 is connected to the system power supply terminal 473; the first end of the second resistor R2 is connected to the second end of the first resistor R24, and the second end of the second resistor R2 is grounded. The first resistor R24 and the second resistor R2 are used for voltage division to reduce the voltage to a range that the SEL pin can withstand.

[0095] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation of the present application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0096] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. A power supply circuit, characterized in that: Applied to a driving recorder, the power supply circuit includes: A first unidirectional conductive member is disposed between an external power supply terminal and an output terminal, wherein the external power supply terminal is used to provide electrical energy, and the output terminal is used to connect to a load; A supercapacitor connected to the external power supply end and the output end; A second unidirectional conductive member is disposed between the external power supply end and the super capacitor; A first switch module is arranged between the supercapacitor and the output end, wherein a controlled end of the first switch module is connected to a system power supply end, and when the external power supply end is powered off, the system power supply end is powered off; When the external power supply end is powered, the first switch module is disconnected, and the external power supply end supplies power to the output end; when the external power supply end is powered off, the first switch module is turned on, and the supercapacitor supplies power to the output end.

2. The power supply circuit according to claim 1, characterized in that: The first switch module comprises: A first capacitor, wherein a first end of the first capacitor is connected to the system power supply end, and a second end of the first capacitor is grounded; a first switch element, wherein a controlled end of the first switch element is connected to a first end of the first capacitor, and an output end of the first switch is grounded; A second switch element, wherein a controlled end of the second switch element is connected to an input end of the first switch, an input end of the second switch element is connected to the supercapacitor, and an output end of the second switch element is connected to the output end.

3. The power supply circuit according to claim 2, characterized in that: The first switch module further includes: A first voltage-dividing resistor, wherein a first end of the first voltage-dividing resistor is connected to the external power supply end; a second voltage-dividing resistor, wherein a first end of the second voltage-dividing resistor is connected to a second end of the first voltage-dividing resistor, and a second end of the second voltage-dividing resistor is grounded; A third switch element, wherein a controlled end of the third switch element is connected to the first end of the second voltage-dividing resistor, an input end of the third switch element is connected to the output end of the second switch element, and an output end of the third switch element is connected to the output end.

4. The power supply circuit according to claim 1, characterized in that: The power supply time of the supercapacitor is 4 seconds to 6 seconds.

5. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes: A first current limiting resistor is arranged between the first unidirectional conductive member and the super capacitor; A second current limiting resistor is connected in parallel with the first current limiting resistor.

6. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes: A second switch module, wherein a controlled end of the second switch module is connected to the system power supply end, an input end of the second switch module is connected to the super capacitor, an output end of the second switch module is connected to a detection end, and the detection end is used to detect the voltage of the super capacitor.

7. The power supply circuit according to claim 6, characterized in that: The second switch module includes: a fourth switch element, wherein a controlled end of the fourth switch element is connected to the system power supply end, and an output end of the fourth switch element is grounded; A fifth switch element, wherein the controlled end of the fifth switch element is connected to the input end of the fourth switch element, the input end of the fifth switch element is connected to the super capacitor, and the output end of the fifth switch element is connected to the detection end.

8. The power supply circuit according to claim 7, characterized in that: The second switch module further includes: a third voltage-dividing resistor, a first end of the third voltage-dividing resistor being connected to the output end of the fifth switch; a fourth voltage-dividing resistor, wherein a first end of the fourth voltage-dividing resistor is connected to the second end of the third voltage-dividing resistor and the detection end, and a second end of the fourth voltage-dividing resistor is grounded.

9. The power supply circuit according to claim 1, characterized in that: The power supply circuit further includes: A filtering module is connected to the output end and is used to filter the output end.

10. A driving recorder, characterized in that: include: The power supply circuit according to any one of claims 1 to 9; A first connecting terminal connected to the external power supply terminal; and A power management module is connected to the output end, and the power management module is used to output multi-channel power supply.

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