Vehicle-mounted data recorder power supply

Abstract

The utility model relates to a vehicle-mounted data recorder power supply, and relates to the technical field of automotive electronics. The power supply comprises a power supply management circuit and a voltage output circuit, efficient management of the power supply is achieved through a switching power supply module and a DCDC conversion module, and meanwhile stable power supply of the vehicle-mounted data recorder is ensured through a relay and a double-electric-layer capacitor. According to the technical scheme, the universality and reliability of the vehicle-mounted data recorder power supply are improved, and the data recording requirements under different vehicle types and working conditions are met.

Description

Technical Field

[0001] The present application relates to the field of power supply equipment, and in particular to a power supply for a vehicle-mounted data recorder. Background Art

[0002] With the development of intelligent automobiles, there are more and more sensors in automobiles, and the data of these sensors need to be stored through data recorders. In addition, data recorders can help vehicle manufacturers record the data generated by the vehicle under different working conditions during the test process, so as to analyze the operating status of components and facilitate continuous optimization of the vehicle status and controller software. If the vehicle fails, the data recorder can help analyze and locate the problem, so as to solve the problem and repair the vehicle more quickly.

[0003] Since there are two types of car power supplies, one is 12V power supply and the other is 24V power supply. 12V power supply is usually used in small cars such as sedans, and 24V power supply is usually used in large cars such as trucks. In general, data loggers are difficult to be compatible with 12V power supply and 24V power supply, which leads to poor versatility of data loggers. Utility Model Content

[0004] In order to improve the versatility of a data recorder, the present application provides a vehicle-mounted data recorder power supply.

[0005] The power supply of the vehicle data recorder provided in this application adopts the following technical solution:

[0006] A vehicle-mounted data recorder power supply comprises a power management circuit, wherein the power management circuit comprises a switching power module and a DCDC conversion module; an input end of the switching power module serves as an input end of the power management circuit and is electrically connected to a car battery, the DCDC conversion module is electrically connected to the switching power module, and an output end of the DCDC conversion module serves as an output end of the power management circuit;

[0007] A voltage output circuit, wherein the input end of the voltage output circuit is electrically connected to the output end of the power management circuit, and the output end of the voltage output circuit is used to connect to the vehicle-mounted data recorder, thereby realizing power supply for the vehicle-mounted data recorder.

[0008] By adopting the above technical solution, the switching power supply and the DCDC conversion module are used in combination to achieve more sophisticated power management. The switching power supply is used as the main power converter of the vehicle data recorder power supply, and the DC-DC conversion module is the follow-up of the switching power supply output. They are specifically used to further adjust the DC voltage provided by the main power supply to the precise voltage level required by the vehicle data recorder, which can make the vehicle data recorder compatible with 12V and 24V car batteries and provide better voltage isolation and load regulation.

[0009] Preferably, an EMC filter circuit is further included, wherein the input end of the EMC filter circuit is electrically connected to the output end of the power management circuit, and the output end of the EMC filter circuit is electrically connected to the input end of the voltage output circuit.

[0010] By adopting the above technical solution, the EMC filter circuit is used to filter out electromagnetic interference in the power supply and improve the stability of the power supply.

[0011] Preferably, a reverse connection protection circuit is also included, which includes a first NMOS tube and a first controller, the source of the NMOS tube is the input end of the reverse connection protection circuit and is electrically connected to the output end of the EMC filter circuit, and the drain of the NMOS tube serves as the output end of the reverse connection protection circuit and is electrically connected to the input end of the voltage output circuit; the first controller provides a gate drive voltage for the first NMOS tube.

[0012] By adopting the above technical solution, the first controller provides a gate drive voltage for the first NMOS tube, thereby realizing rapid protection in the case of reverse connection.

[0013] Preferably, the first controller is a LM74610 and has a fast response internal comparator for discharging the MOSFET gate in reverse polarity conditions.

[0014] By adopting the above technical solution, the first controller can discharge the MOSFET gate under reverse polarity conditions, thereby effectively limiting the magnitude and duration of the reverse current and achieving reverse connection protection.

[0015] Preferably, it also includes a voltage protection circuit;

[0016] The voltage protection circuit includes a second NMOS tube and a second controller, wherein the second controller is LM5060, and is used to drive the second NMOS tube.

[0017] By adopting the above technical solution, the second controller provides a gate drive voltage for the second NMOS tube, thereby achieving overvoltage and low voltage protection.

[0018] Preferably, the output circuit includes a relay and a capacitor; the relay has two terminals, the two terminals are respectively connected to the power management circuit and the vehicle-mounted data recorder, and the terminal connected to the vehicle-mounted data recorder is also electrically connected to the positive electrode of the capacitor; the negative electrode of the capacitor is grounded.

[0019] By adopting the above technical solution, the relay can achieve electrical isolation to ensure the safety of the power supply and the on-board data recorder, and the capacitor is used to store electrical energy and provide power supply to the on-board data recorder when needed.

[0020] Preferably, the capacitor is configured as a double-layer capacitor.

[0021] By adopting the above technical solution, the double-layer capacitor has the advantages of fast charging, long life, good temperature characteristics, energy saving and environmental protection. At the same time, it can ensure that after an abnormal power outage, a stable power supply is provided to the vehicle data recorder in a short time to ensure the security of the data.

[0022] Preferably, the voltage output circuit further includes a voltage detection unit for detecting whether the output voltage is stable.

[0023] By adopting the above technical solution, it is possible to effectively detect whether the output voltage is stable, so as to take corresponding protection measures when the output voltage is unstable.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. Since the present application adopts a switching power supply module and a DCDC conversion module to achieve efficient power management, the conversion efficiency and stability of the power supply are improved.

[0026] 2. In this application, relays and double-layer capacitors are preferably used to ensure stable power supply to the vehicle data recorder, avoiding data loss or damage due to power fluctuations or short interruptions.

[0027] 3. This application improves the reliability and safety of the power supply by setting up multiple protection mechanisms such as EMC filtering circuit, reverse connection protection circuit and voltage protection circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the circuit principle of the vehicle-mounted data recorder power supply in the embodiment of the present application;

[0029] Figure 2 It is a circuit structure diagram of an EMC filter circuit and a reverse connection protection circuit in an embodiment of the present application;

[0030] Figure 3 Schematic diagram of the circuit structure of the voltage protection circuit in the embodiment of the present application.

[0031] Markings in the attached figure: 1. power management circuit; 11. switching power supply module; 12. DCDC conversion module; 2. voltage output circuit; 21. relay; 22. capacitor; 23. voltage detection unit; 3. EMC filter circuit; 4. reverse connection protection circuit; 41. first NMOS tube; 42. first controller; 5. voltage protection circuit; 51. second NMOS tube; 52. second controller. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-3 This application is described in further detail.

[0033] The vehicle data recorder power supply provided in the embodiment of the present application refers to Figure 1 The power supply of the vehicle-mounted data recorder includes a power management circuit 1, an EMC filter circuit 3, a reverse connection protection circuit 4, a voltage protection circuit 5 and a voltage output circuit 2.

[0034] The power management circuit 1 includes a switching power module 11 and a DCDC conversion module 12. The input end of the switching power module 11 serves as the input end of the power management circuit 1 and is electrically connected to the car battery, and is used to receive the 12V or 24V voltage provided by the car battery. The DCDC conversion module 12 is electrically connected to the switching power module 11, and is used to convert the voltage output by the switching power module 11 into a stable 5V voltage. The output end of the DCDC conversion module 12 serves as the output end of the power management circuit 1.

[0035] The EMC filter circuit 3, the reverse connection protection circuit 4 and the voltage protection circuit 5 are all located between the power management circuit 1 and the voltage output circuit 2, and the voltage signal is processed by the power management circuit 1 in sequence through the EMC filter circuit 3, the reverse connection protection circuit 4 and the voltage protection circuit 5, and finally output by the voltage output circuit 2.

[0036] The input end of the EMC filter circuit 3 is electrically connected to the output end of the power management circuit 1, and the output end of the EMC filter circuit 3 is electrically connected to the input end of the voltage output circuit 2. The EMC filter circuit 3 is used to filter out electromagnetic interference in the power supply and improve the stability and reliability of the power supply.

[0037] Reference Figure 1 and reference Figure 2 , the reverse connection protection circuit 4 includes a first NMOS tube 41 and a first controller 42. The source of the first NMOS tube 41 serves as the input end of the reverse connection protection circuit 4 and is electrically connected to the output end of the EMC filter circuit 3, and the drain of the first NMOS tube 41 serves as the output end of the reverse connection protection circuit 4 and is electrically connected to the input end of the voltage output circuit 2. The first controller 42 adopts the LM74610 model and has a fast response internal comparator. When the power supply is reversed, the first controller 42 drives the first NMOS tube 41 to turn on, short-circuiting the reverse power supply to the ground, thereby protecting the subsequent circuit from damage. At the same time, the fast response internal comparator of the first controller 42 can quickly discharge the MOSFET gate under reverse polarity conditions, effectively limit the magnitude and duration of the reverse current, and further improve the safety and reliability of the power supply.

[0038] Reference Figure 1 and Figure 3The voltage protection circuit 5 includes a second NMOS transistor 51 and a second controller 52. The input end of the second controller 52 is electrically connected to the output end of the power management circuit 1, and the output end of the second controller 52 is electrically connected to the gate of the second NMOS transistor 51. The source of the second NMOS transistor 51 is grounded, and the drain of the second NMOS transistor 51 serves as the output end of the voltage protection circuit 5 and is electrically connected to the input end of the voltage output circuit 2.

[0039] The second controller 52 adopts the LM5060 model and has overvoltage and undervoltage protection functions. When the voltage output by the power management circuit 1 is too high or too low, the second controller 52 drives the second NMOS tube 51 to conduct, short-circuiting the power supply to the ground, thereby protecting the subsequent circuits from damage. At the same time, the second controller 52 can also monitor the stability of the power supply voltage and take corresponding protection measures when necessary to ensure the safety and reliability of the power supply.

[0040] The voltage output circuit 2 includes a voltage detection unit 23, a relay 21 and a double-layer capacitor 22. The input end of the voltage detection unit 23 is electrically connected to the output end of the voltage protection circuit 5 to detect whether the output voltage is stable. When the output voltage is unstable, the voltage detection unit 23 can monitor the change of the output voltage in real time, providing important reference information for power management.

[0041] The relay 21 has two terminals, which are respectively connected to the power management circuit 1 and the on-board data recorder, and the terminal connected to the on-board data recorder is also electrically connected to the positive electrode of the capacitor 22; the negative electrode of the capacitor 22 is grounded. When the relay 21 is closed, the 5V voltage output by the power management circuit 1 supplies power to the on-board data recorder through the relay 21, and charges the double-layer capacitor 22 at the same time. When the relay 21 is disconnected, the double-layer capacitor 22 releases the stored electrical energy to provide a short-term power supply for the on-board data recorder to ensure the integrity and security of the data.

[0042] To sum up, the vehicle-mounted data recorder power supply of the present application improves the reliability and safety of the power supply through multiple protection mechanisms, adopts a modular design to reduce maintenance costs and difficulty of use, and uses a double-layer capacitor 22 to ensure stable power supply for the vehicle-mounted data recorder, avoiding data loss or damage caused by power fluctuations or short interruptions.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A vehicle-mounted data recorder power supply, characterized in that: The invention comprises a power management circuit (1), wherein the power management circuit (1) comprises a switching power module (11) and a DCDC conversion module (12); the input end of the switching power module (11) serves as the input end of the power management circuit (1) and is electrically connected to a car battery, the DCDC conversion module (12) is electrically connected to the switching power module (11), and the output end of the DCDC conversion module (12) serves as the output end of the power management circuit (1); A voltage output circuit (2), wherein an input end of the voltage output circuit (2) is electrically connected to an output end of the power management circuit (1), and an output end of the voltage output circuit (2) is used to be connected to an on-board data recorder, thereby realizing power supply for the on-board data recorder.

2. The vehicle-mounted data recorder power supply according to claim 1, characterized in that: It also comprises an EMC filter circuit (3), wherein the input end of the EMC filter circuit (3) is electrically connected to the output end of the power management circuit (1), and the output end of the EMC filter circuit (3) is electrically connected to the input end of the voltage output circuit (2).

3. The vehicle-mounted data recorder power supply according to claim 2, characterized in that: It also includes a reverse connection protection circuit (4), the reverse connection protection circuit (4) comprising a first NMOS tube (41) and a first controller (42), the source of the NMOS tube being the input end of the reverse connection protection circuit (4) and being electrically connected to the output end of the EMC filter circuit (3), the drain of the NMOS tube being the output end of the reverse connection protection circuit (4) and being electrically connected to the input end of the voltage output circuit (2); the first controller (42) providing a gate drive voltage for the first NMOS tube (41).

4. The vehicle-mounted data recorder power supply according to claim 3, characterized in that: The first controller (42) is a LM74610 and has a fast response internal comparator for discharging the MOSFET gate in reverse polarity conditions.

5. The vehicle-mounted data recorder power supply according to claim 1, characterized in that: Also includes a voltage protection circuit (5); The voltage protection circuit (5) comprises a second NMOS tube (51) and a second controller (52); the second controller (52) is LM5060 and is used to drive the second NMOS tube (51).

6. The vehicle-mounted data recorder power supply according to claim 1, characterized in that: The output circuit comprises a relay (21) and a capacitor (22); the relay (21) has two terminals, the two terminals are respectively connected to the power management circuit (1) and the on-board data recorder, and the terminal connected to the on-board data recorder is also electrically connected to the positive electrode of the capacitor (22); the negative electrode of the capacitor (22) is grounded.

7. The vehicle-mounted data recorder power supply according to claim 6, characterized in that: The capacitor (22) is configured as a double-layer capacitor (22).

8. The vehicle-mounted data recorder power supply according to claim 6, characterized in that: The voltage output circuit (2) also includes a voltage detection unit (23) for detecting whether the output voltage is stable.

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