Self-recovery circuit

Abstract

The utility model provides a self-recovery circuit which comprises a vehicle lamp control module and a vehicle lamp module, the vehicle lamp control module is connected with the vehicle lamp module through a power supply module, and the vehicle lamp control module is in data intercommunication with the vehicle lamp module through a bus; a switch module used for cutting off power supply of the power module and a current monitoring module used for monitoring output current of the power module are connected between the power module and the automobile lamp module in series, the switch module and the current monitoring module are connected with a control module, and the control module is in data intercommunication with a bus through an information receiving and transmitting module. And the information receiving and transmitting module is used for receiving messages transmitted by the bus. According to the utility model, all faults recovered through a switch function or power-off restart can be self-recovered.

Description

Technical Field

[0001] This utility model relates to the field of vehicle lighting power supply technology, specifically to a self-recovery circuit. Background Technology

[0002] In modern automotive electrical systems, the headlight control module works closely with the headlight module to ensure the vehicle's lighting needs are met under various driving conditions. As vehicles become increasingly intelligent, the headlight control module is responsible for precisely controlling the headlight module's on / off state and brightness adjustment based on factors such as ambient light and vehicle driving status.

[0003] The vehicle lighting module encompasses various lights, including headlights, taillights, and turn signals, and their stable power supply is crucial for driving safety. Under normal circumstances, the vehicle's power system supplies power to the lighting control module through a specific circuit design, which then distributes the appropriate power to the lighting modules. However, due to the complex operating conditions encountered during vehicle operation, such as prolonged bumps and vibrations, wiring connections can easily become loose, leading to poor contact in the power supply lines. Furthermore, extreme temperature changes, whether extreme heat or cold, can cause performance degradation of electronic components, causing the failure of critical components such as capacitors and resistors in the power supply module, resulting in abnormal power supply. In addition, the complex electromagnetic environment inside the vehicle, especially when other high-power electronic devices are frequently started and stopped, can generate electromagnetic interference, interfering with power signal transmission and causing power interruptions or instability between the lighting control module and the lighting modules.

[0004] When such a power supply anomaly occurs, if power cannot be restored in time, the vehicle will face serious safety hazards. For example, if the headlights suddenly go out while driving at night, the driver's vision is instantly limited, making it difficult to see the road and obstacles ahead, which can easily lead to a collision. If the turn signals are not working due to a power problem, following vehicles cannot accurately judge the turning intentions of the vehicle in front, which can also easily lead to a rear-end collision. Given that the automatic power restoration mechanism may also fail due to a malfunction, manually restoring or restarting the power supply becomes a crucial emergency measure to ensure the vehicle's basic lighting function and maintain driving safety, and its importance cannot be overstated. Utility Model Content

[0005] In view of this, the problem to be solved by this utility model is to provide a self-recovery circuit that can self-recover all faults that can be recovered by switching on / off function or power-off restart.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A self-recovery circuit includes a headlight control module and a headlight module. The headlight control module is connected to the headlight module through a power module, and the headlight control module communicates with the headlight module via a bus.

[0008] The power module and the headlight module are connected in series with a switch module for disconnecting the power supply to the power module and a current monitoring module for monitoring the output current of the power module. The switch module and the current monitoring module are connected to the control module. The control module communicates with the bus data through an information transceiver module, which is used to receive messages transmitted by the bus.

[0009] Furthermore, the control module includes a control chip U4, and the information transceiver module includes a transceiver chip U1. The transceiver chip U1 communicates with the control chip U4 via the TX and RX pins, and communicates with the bus via the LIN pin.

[0010] Furthermore, a resistor R14 is connected in series between the power supply module and the vehicle light module. The current monitoring module includes a comparator chip U6. The IN+ and IN- pins of the comparator chip U6 are respectively connected to the two ends of the resistor R14. The OUT pin of the comparator chip U6 is connected to the ADC1 pin of the control chip U4.

[0011] Furthermore, the power supply module includes a RAT port for outputting electrical energy, the switching module includes a MOSFET Q3 whose source is connected to the RAT port, the drain of the MOSFET Q3 is connected to the vehicle lighting module, the gate of the MOSFET Q3 is connected to the collector of the transistor Q5, and the base of the transistor Q5 is connected to the EN pin of the control chip U4.

[0012] Furthermore, the gate of the MOS transistor Q3 is connected to the collector of the transistor Q4, the base of the transistor Q4 is connected to the collector of the transistor Q5, and a resistor R19 is connected in series between the base of the transistor Q4 and the output terminal of the power module.

[0013] Furthermore, a control startup module is connected in series between the power supply module and the control module. The control startup module includes a trigger circuit and a power supply circuit for supplying power to the control module. The trigger circuit is used to enable the power supply circuit, the control chip U4, and the transceiver chip U1 to work simultaneously.

[0014] The trigger circuit includes a transistor Q2, and the power supply module includes an INH port that outputs high voltage. The INH port is connected to the INH pin of the transceiver chip U1 and the base of the transistor Q2. The base of the transistor Q2 is connected to the ENA pin of the control chip U4, and the collector of the transistor Q2 is connected to the power supply circuit.

[0015] Furthermore, the power supply circuit includes a transistor Q1 whose base is connected to the collector of transistor Q2, the collector of transistor Q1 is connected to the RAT port, the emitter of transistor Q1 is connected to the IN pin of voltage regulator chip U2, and the OUT pin of voltage regulator chip U2 outputs stable power.

[0016] The advantages and positive effects of this utility model are:

[0017] By setting up a switch module, a current monitoring module, an information transceiver module, and a control module, the control module controls the switch module to disconnect the connection between the power supply module and the headlight module based on the power supply data and control data collected by the current monitoring module and the information transceiver module. This enables the headlight module to restart after a power outage or switch on / off, thus restoring the headlight module from faults. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is an overall system structure diagram of a self-recovery circuit according to this utility model;

[0020] Figure 2 This is a circuit diagram of the control module of a self-recovery circuit according to this utility model;

[0021] Figure 3 This is a circuit diagram of an information transceiver module of a self-recovering circuit according to this utility model;

[0022] Figure 4 This is a circuit diagram of a self-recovery circuit switching module and a power monitoring module of the present invention;

[0023] Figure 5 This is a circuit diagram of a control start module for a self-recovery circuit according to this utility model. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] This utility model provides a self-recovery circuit, such as Figure 1 As shown, it includes a headlight control module and a headlight module. The headlight control module is connected to the headlight module through a power supply module to supply power to the headlight module. The headlight control module communicates with the headlight module via a LIN bus or a CAN bus.

[0027] The self-recovery circuit includes a control module, which controls the power supply module to supply power or controls the restart of the headlight module. The control module is connected to a switch module, a current monitoring module, and an information transceiver module. The current monitoring module monitors the output current of the power supply module, the information transceiver module receives messages transmitted via the LIN bus or CAN bus, and the switch module disconnects the connection between the voltage module and the headlight module. The headlight module's power-off restart or switching function restores the headlight module from fault.

[0028] The control module controls the switching module to disconnect the power supply to the headlight module or restart it after a power outage, based on the current monitoring module and the information transceiver module, in order to eliminate the headlight module malfunction.

[0029] like Figure 2 and Figure 3 As shown, the control module includes a control chip U4, and the information transceiver module includes a transceiver chip U1. Transceiver chip U1 includes TX and RX pins for connecting to the control chip U4, enabling data exchange between the two chips. Transceiver chip U1 also includes a LIN pin for connecting to a LIN or CAN bus, enabling message reception. The working process is as follows: transceiver chip U1 receives long-transmitted messages from the LIN or CAN bus and parses the message data. The control chip U4 receives the message data and controls the switching module to power off and restart the vehicle lighting module.

[0030] like Figure 4As shown, a resistor R14 is connected in series between the power supply module and the headlight module. The current monitoring module includes a comparator chip U6, which has IN+, IN-, and OUT pins. The IN+ and IN- pins are connected to the two ends of the resistor R14, and the OUT pin is connected to the ADC1 pin of the control chip U4. The operation is as follows: the power supply module outputs a supply current, which powers the headlight module through the resistor R14. If the current flowing through the resistor R14 is abnormal, the voltage across the resistor changes, and the output voltage of the OUT pin changes. The control chip U4 controls the switching module to operate based on the output of the OUT pin, or restarts the headlight module through the information transceiver module to eliminate the fault.

[0031] The switching module includes a MOSFET Q3. The source of MOSFET Q3 is connected to the RAT port of the power supply module, the drain of MOSFET Q3 is connected to the vehicle lighting module (or a resistor R14 is connected in series between the drain of MOSFET Q3 and the vehicle lighting module), the gate of MOSFET Q3 is connected to the collector of transistor Q5, and the base of transistor Q5 is connected to the EN pin of the control chip U4.

[0032] The working process of the switching module is as follows: Under normal circumstances, MOSFET Q3 is in the on state. When the current monitoring module detects an abnormal output current at the RAT port of the power supply module, the EN pin of the control chip U4 outputs a pulse signal, which turns on transistor Q5, grounds the drain of MOSFET Q3, and turns MOSFET Q3 into the off state, disconnecting the power supply between the power supply module and the vehicle lighting module; when the pulse signal ends, transistor Q5 turns off and MOSFET Q3 turns on.

[0033] The emitters of transistors Q4 and Q5 are both grounded. A voltage regulating resistor and a filter capacitor are connected in series between the emitter and base of transistors Q4 and Q5, respectively, to improve the stability of the base voltage of transistors Q4 and Q5.

[0034] Because the voltage transition range of the EN pin of the control chip U4 is small, in order to improve the control accuracy of the control chip U4, the gate of MOSFET Q3 is connected to the collector of transistor Q4, and the base of transistor Q4 is connected to the collector of transistor Q5. A resistor R19 is connected in series between the base of transistor Q4 and the output terminal of the power module. By raising the base voltage of transistor Q4, the effectiveness of transistors Q4 and Q5 in controlling the operation of MOSFET Q3 is improved.

[0035] The power module includes a RAT port for outputting electrical power. A transient voltage suppression diode TVS1 and a capacitor C18 are connected in series between the RAT port and ground to improve the stability of the power module's output voltage.

[0036] like Figure 1 and Figure 5As shown, a control startup module is connected in series between the power supply module and the control module. The control startup module includes a trigger circuit and a power supply circuit. The power supply circuit is used to provide 5V power to the control chip U4, and the trigger circuit is used to activate the power supply circuit to power the control chip U4.

[0037] The trigger circuit includes transistor Q2 and an INH port that provides high voltage. The INH port is connected to the INH pin of transceiver chip U1. The emitter of transistor Q2 is grounded, and a resistor R8 is connected in series between the base of transistor Q2 and the INH port. A resistor R5 is connected in series between the base of transistor Q2 and the ENA pin of control chip U4. When the voltage on the ENA pin is pulled high, control chip U4 starts to work. The working process is as follows: the high voltage output from the INH port directly causes transceiver chip U1 and control chip U4 to start working.

[0038] The power supply circuit includes transistor Q1. The base of transistor Q1 is connected to the collector of transistor Q2. The collector of transistor Q1 is connected to the RAT port. The emitter of transistor Q1 is connected to the IN pin of voltage regulator chip U2. The OUT pin of voltage regulator chip U2 outputs a stable 5V voltage. While the trigger circuit enables the control chip U4 to work, the power supply circuit provides 5V power to the control chip U4.

[0039] To improve the stability of the received voltage at the IN pin of the voltage regulator chip U2, capacitors C8, C9, C10, and C11 are connected in series between the IN pin and ground, respectively. To improve the stability of the output voltage at the OUT pin of the voltage regulator chip U2, capacitors C5, C6, and C7 are connected in series between the OUT pin and ground, respectively.

[0040] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this patent.

Claims

1. A self-restoring circuit, characterized by, The vehicle lamp control module is connected with the vehicle lamp module through a power module, and the vehicle lamp control module is in data intercommunication with the vehicle lamp module through a bus; A switch module for disconnecting the power module and a current monitoring module for monitoring the output current of the power module are connected in series between the power module and the vehicle lamp module, the switch module and the current monitoring module are connected with the control module, the control module is in data intercommunication with the bus through an information transceiving module, and the information transceiving module is used for receiving messages transmitted by the bus.

2. A self-restoring circuit according to claim 1, characterized in that The control module includes a control chip U4, the information transceiving module includes a transceiving chip U1, the transceiving chip U1 is in data intercommunication with the control chip U4 through a TX pin and an RX pin, and the transceiving chip U1 is in data intercommunication with the bus through a LIN pin.

3. A self-restoring circuit according to claim 1, characterized in that The self-recovery circuit further includes a power supply module, a resistor R14 is connected in series between the power supply module and the vehicle lamp module, the current monitoring module includes a comparison chip U6, an IN+ pin and an IN- pin of the comparison chip U6 are respectively connected to both ends of the resistor R14, and an OUT pin of the comparison chip U6 is connected with an ADC1 pin of the control chip U4.

4. A self-restoring circuit according to claim 1, characterized in that, The power module includes an RAT port for outputting electric energy, the switch module includes a MOS tube Q3 with a source electrode connected with the RAT port, a drain electrode of the MOS tube Q3 is connected with the vehicle lamp module, a gate electrode of the MOS tube Q3 is connected with a collector electrode of a triode Q5, and a base electrode of the triode Q5 is connected with an EN pin of the control chip U4.

5. A self-restoring circuit according to claim 4, characterised in that, A gate electrode of the MOS tube Q3 is connected with a collector electrode of a triode Q4, a base electrode of the triode Q4 is connected with a collector electrode of the triode Q5, and a resistor R19 is connected in series between the base electrode of the triode Q4 and an output terminal of the power module.

6. A self-restoring circuit according to claim 1, characterized in that A control starting module is connected in series between the power module and the control module, the control starting module includes a trigger circuit and a power supply circuit for supplying power to the control module, and the trigger circuit is used for simultaneously working the power supply circuit, the control chip U4 and the transceiving chip U1; The trigger circuit includes a triode Q2, the power module includes an INH port for outputting high-voltage electricity, the INH port is respectively connected with an INH pin of the transceiving chip U1 and a base electrode of the triode Q2, the base electrode of the triode Q2 is connected with an ENA pin of the control chip U4, and a collector electrode of the triode Q2 is connected with the power supply circuit.

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