A redundant high-side drive circuit for dual flashers, a drive system and a vehicle

Abstract

This utility model discloses a redundant high-side drive circuit, drive system, and vehicle for hazard lights. It includes a detection module, a switch module, and a protection drive module. The input terminal of the detection module is connected to the power supply terminal of the hazard light load, and the output terminal of the detection module is connected to the input terminal of the TBOX controller. The input terminal of the switch module is connected to the output terminal of the TBOX controller, and the output terminal of the switch module is connected to the control terminal of the protection drive module. The input terminal of the protection drive module is connected to the TBOX backup battery, and the output terminal of the protection drive module is connected to the power supply terminal of the hazard light load. The TBOX controller controls the switch module to conduct based on the signal detected by the detection module, thus connecting the input and output terminals of the protection drive module. This utility model can effectively activate hazard lights in emergency situations, reducing safety risks.

Description

Technical Field

[0001] This utility model belongs to the field of automotive electrical component drive, specifically relating to a redundant high-side drive circuit for hazard lights, a drive system, and a vehicle. Background Technology

[0002] With the rapid advancement of new energy technologies, the electric vehicle industry is booming, and its market share is steadily increasing. Compared to traditional gasoline vehicles, new energy vehicles have a higher degree of electrification and intelligence, thus placing higher demands on vehicle functional safety. In specific scenarios, such as when the vehicle loses power or the drive control chip for the hazard lights fails, the hazard lights may not function properly, posing a potential threat to surrounding vehicles or pedestrians and creating a safety hazard. Utility Model Content

[0003] The purpose of this invention is to provide a redundant high-side drive circuit, drive system, and vehicle for hazard lights, so as to effectively activate hazard lights in emergency situations and reduce safety risks.

[0004] In a first aspect, this utility model provides a redundant high-side drive circuit for a hazard light, comprising: a detection module, a switch module, and a protection drive module. The input terminal of the detection module is connected to the power supply terminal of the hazard light load, and the output terminal of the detection module is connected to the input terminal of the TBOX controller. The input terminal of the switch module is connected to the output terminal of the TBOX controller, and the output terminal of the switch module is connected to the control terminal of the protection drive module. The input terminal of the protection drive module is connected to the TBOX backup battery, and the output terminal of the protection drive module is connected to the power supply terminal of the hazard light load. The TBOX controller controls the switch module to conduct according to the signal detected by the detection module, thereby connecting the input terminal and the output terminal of the protection drive module.

[0005] Preferably, the detection module includes resistors R7, R8, and R9, and capacitor C2. One end of resistor R7 is connected to the power supply terminal of the hazard flash load, and the other end of resistor R7 is connected to one end of resistor R8 and one end of resistor R9. The other end of resistor R9 is grounded. The other end of resistor R8 is connected to the input terminal of the TBOX controller and one end of capacitor C2, and the other end of capacitor C2 is grounded. This detection module, through a combination of resistor voltage division and RC filtering, safely and accurately converts the high-voltage drive signal into a low-voltage detection signal, possessing anti-interference, anti-false judgment, and input protection capabilities, ensuring real-time and reliable monitoring of the high-side drive state by the TBOX controller.

[0006] Preferably, the switching module includes resistors R4, R5, and R6, and transistor Q2. One end of resistor R5 is connected to the output terminal of the TBOX controller, and the other end is grounded. One end of resistor R6 is connected to the output terminal of the TBOX controller, and the other end is connected to the base of transistor Q2. The emitter of transistor Q2 is grounded, and the collector is connected to one end of resistor R4. The other end of resistor R4 is connected to the control terminal of the protection drive module (3). A transistor Q2 is used to convert the logic signal of the TBOX controller into an open-collector signal to control the protection drive module. At the same time, level clamping and anti-interference are achieved through resistors R5 and R6, and a logic high level is provided through resistor R4, ensuring reliable shutdown, surge protection, and simple wiring.

[0007] Preferably, the transistor Q2 is an NPN transistor.

[0008] Preferably, the protection drive module includes a boost converter, resistors R1, R2, and R3, capacitor C1, transistor Q1, and MOSFET Q3. The input of the boost converter is connected to the TBOX backup battery, and its output is connected to one end of resistor R1 and the emitter of transistor Q1. The other end of resistor R1 is connected to one end of resistor R2, one end of resistor R3, one end of capacitor C1, and the source of MOSFET Q3. The other end of resistor R2 is connected to the base of transistor Q1, and the other end of resistor R3 is connected to the collector of transistor Q1, the other end of capacitor C1, the gate of MOSFET Q3, and the output of the switching module. The drain of MOSFET Q3 is connected to the power supply terminal of the hazard light load. This protection drive module achieves stable power supply for the hazard lights through boost voltage and high-side MOSFET drive. Simultaneously, it utilizes the mechanism of resistor R1 detecting current and transistor Q1 quickly turning off the MOSFET to rapidly cut off the power supply in case of short circuit or overload, achieving both reliable drive and fault self-protection. This is highly suitable for the need to activate hazard lights in emergency situations in automobiles.

[0009] Preferably, the protection drive module further includes a diode D1, with the anode of diode D1 connected to the drain of MOSFET Q3 and the cathode of diode D1 connected to the power supply terminal of the hazard lamp load. Adding diode D1 enables the protection drive module to have reverse polarity protection, preventing MOSFET Q3 and the boost converter from burning out due to reverse connection.

[0010] Preferably, the boost converter adopts a BOOST boost circuit, the transistor Q1 is a PNP type transistor, and the MOSFET Q3 is a PMOS type transistor.

[0011] Preferably, resistors R3 and R1 satisfy the following condition: R3 ≥ 10R1, and resistors R3 and R4 satisfy the following condition: R3 ≥ 10R4. The resistance of resistor R4 is greater than or equal to 10 times the resistance of the dummy flash load. This prevents excessive current shunting in the R3→R4→Q2→ground loop when MOSFET Q3 is turned on, avoiding insufficient drive current for the dummy flash load and thus better ensuring effective drive of the dummy flash load. Resistors R7, R9, and R3 satisfy the following condition: R7 + R9 ≥ 10R3. This ensures that the current in the R7→R9→ground loop is appropriate when MOSFET Q3 is turned on, which is more conducive to detection.

[0012] Secondly, this utility model provides a dual flash drive system, which includes a main high-side drive circuit connected to the power supply terminal of the dual flash load and the aforementioned dual flash redundant high-side drive circuit.

[0013] Thirdly, this utility model provides a vehicle that includes the aforementioned hazard light drive system.

[0014] This invention utilizes a TBOX backup battery as the power supply when the vehicle loses power, and employs a redundant high-side drive circuit as the drive circuit when the control chip of the main high-side drive circuit fails. This allows the hazard lights to continue to work effectively, enabling the vehicle to effectively activate the hazard lights in emergency situations to warn surrounding vehicles and pedestrians, thereby reducing safety risks. Attached Figure Description

[0015] Figure 1 This is a schematic diagram showing the connection between the redundant high-side drive circuit of the dual flash lamp, the TBOX backup battery, and the TBOX controller in an embodiment of this utility model.

[0016] Figure 2 This is a circuit diagram showing the connection between the redundant high-side drive circuit of the dual flash lamp, the TBOX backup battery, and the TBOX controller in an embodiment of this utility model. Detailed Implementation

[0017] To gain a more detailed understanding of the features and technical content of the embodiments of this utility model, the implementation of the embodiments of this utility model will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of this utility model.

[0018] 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 embodiments of the invention only and is not intended to limit the invention.

[0019] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0020] like Figure 1 As shown, the redundant high-side drive circuit for the dual flasher in this embodiment includes: a detection module 1, a switch module 2, and a protection drive module 3. The input terminal of the detection module 1 is connected to the power supply terminal of the dual flasher load 5 (which is also the output terminal of the main high-side drive circuit 4). The output terminal of the detection module 1 is connected to the input terminal of the TBOX controller 6. The input terminal of the switch module 2 is connected to the output terminal of the TBOX controller 6. The output terminal of the switch module 2 is connected to the control terminal of the protection drive module 3. The input terminal of the protection drive module 3 is connected to the TBOX backup battery 7. The output terminal of the protection drive module 3 is connected to the power supply terminal of the dual flasher load 5.

[0021] like Figure 2 As shown, in some embodiments, the detection module 1 includes resistors R7, R8, and R9, and capacitor C2. The switching module 2 includes resistors R4, R5, and R6, and transistor Q2. The protection drive module 3 includes a boost converter 31, resistors R1, R2, and R3, capacitor C1, transistor Q1, MOSFET Q3, and diode D1.

[0022] As an example, transistor Q2 is an NPN transistor, boost converter 31 uses a BOOST boost circuit, transistor Q1 is a PNP transistor, and MOSFET Q3 is a PMOS transistor. Resistors R3 and R1 satisfy: R3 ≥ 10R1; resistors R3 and R4 satisfy: R3 ≥ 10R4; the resistance of resistor R4 is greater than or equal to 10 times the resistance of the hazard light load 5; resistors R7, R9, and R3 satisfy: R7 + R9 ≥ 10R3.

[0023] One end of resistor R7 is connected to the output terminal of the main high-side drive circuit 4. The other end of resistor R7 is connected to one end of resistor R8 and one end of resistor R9. The other end of resistor R9 is grounded. The other end of resistor R8 is connected to the input terminal of TBOX controller 6 (the voltage status signal TBOX_LED_ST_FB of the input drive port) and one end of capacitor C2. The other end of capacitor C2 is grounded. One end of resistor R5 is connected to the output terminal of TBOX controller 6 (output signal TBOX_LED_CTL). The other end of resistor R5 is grounded. One end of resistor R6 is connected to the output terminal of TBOX controller 6 (output signal TBOX_LED_CTL). The other end of resistor R6 is connected to the base of transistor Q2. The emitter of transistor Q2 is grounded. The collector of transistor Q2 is connected to one end of resistor R4. The input of boost converter 31 is connected to the TBOX backup battery 7. The output of boost converter 31 is connected to one end of resistor R1 and the emitter of transistor Q1. The other end of resistor R1 is connected to one end of resistor R2, one end of resistor R3, one end of capacitor C1 and the source of MOSFET Q3. The other end of resistor R2 is connected to the base of transistor Q1. The other end of resistor R3 is connected to the collector of transistor Q1, the other end of capacitor C1, the gate of MOSFET Q3 and the other end of resistor R4. The drain of MOSFET Q3 is connected to the anode of diode D1. The cathode of diode D1 is connected to the power supply terminal of hazard lamp load 5.

[0024] Since the current functional safety regulations for new energy vehicles require that the TBOX must be able to maintain communication function for a certain period of time after the vehicle loses power, the TBOX backup battery 7 can be used as the output power of the redundant high-side drive circuit of the hazard lights, so as to continue to drive the hazard lights in the event of a power failure of the vehicle or failure of the conventional drive of the hazard lights.

[0025] Its working principle is as follows: The TBOX controller 6 detects the driving status of the hazard flash load 5 based on the voltage status signal TBOX_LED_ST_FB of the input drive port. The TBOX controller 6 controls the on / off of the drive output through the output signal TBOX_LED_CTL. The TBOX backup battery 7, after being boosted by the BOOST boost circuit, serves as the output power supply V for the redundant high-side drive circuit of the hazard flash. in .

[0026] Under normal circumstances, the hazard flasher load 5 is driven by the main high-side drive circuit 4. The signal TBOX_LED_CTL output by the TBOX controller 6 remains at a low level, and the entire redundant high-side drive circuit of the hazard flasher does not work.

[0027] When the main high-side drive circuit 4 fails (e.g., the control chip of the main high-side drive circuit 4 fails), the detection module 1, composed of resistors R7, R8, R9, and capacitor C2, detects the signal reflecting the failure of the main high-side drive circuit 4 at its output terminal and converts it into a voltage status signal TBOS_LED_ST_FB at the drive port, which is then transmitted to the TBOX controller 6. The TBOX controller 6 determines that the main high-side drive circuit 4 (for the hazard lights) has no drive output and pulls the signal TBOX_LED_CTL high (i.e., the signal TBOX_LED_CTL is at a high level), at which point transistor Q2 is turned on. Since the resistance of resistor R3 is much greater than that of resistors R1 and R4, the voltage drop across resistor R3 is close to V. in If the voltage is greater than the gate-source voltage of MOSFET Q3, then MOSFET Q3 will conduct, forming a path V. in →R1→Q3→D1→Hazard light load, driving hazard light load 5 to continue working. When the vehicle loses power, the main high-side drive circuit 4 has no output, and the circuit operation logic is the same as above.

[0028] In the protection drive module 3, resistors R1 and R2, along with transistor Q1, form an overcurrent protection mechanism. When the drive output current exceeds the overcurrent, the voltage across resistor R1 exceeds the turn-on voltage of transistor Q1, causing Q1 to conduct and pull the gate voltage of MOSFET Q3 up to near V. in At this time, the voltage between the gate and source of MOSFET Q3 is less than the turn-on voltage of MOSFET Q3, causing MOSFET Q3 to turn off, thus achieving overcurrent protection. The resistance value of resistor R1 can be adjusted according to the required output current. Furthermore, the presence of diode D1 provides the circuit with reverse polarity protection.

[0029] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A dual flash lamp redundant high-side driver circuit, comprising: include: The detection module (1), switch module (2), and protection drive module (3) are configured such that the input terminal of the detection module (1) is connected to the power supply terminal of the double flash load (5), the output terminal of the detection module (1) is connected to the input terminal of the TBOX controller (6), the input terminal of the switch module (2) is connected to the output terminal of the TBOX controller (6), the output terminal of the switch module (2) is connected to the control terminal of the protection drive module (3), the input terminal of the protection drive module (3) is connected to the TBOX backup battery (7), and the output terminal of the protection drive module (3) is connected to the power supply terminal of the double flash load (5). The TBOX controller (6) controls the switch module (2) to conduct according to the signal detected by the detection module (1), so that the input terminal and output terminal of the protection drive module (3) are connected.

2. The dual flash lamp redundant high-side driver circuit of claim 1, wherein: The detection module (1) includes resistors R7, R8, R9 and capacitor C2. One end of resistor R7 is connected to the power supply terminal of the double flash load (5). The other end of resistor R7 is connected to one end of resistor R8 and one end of resistor R9. The other end of resistor R9 is grounded. The other end of resistor R8 is connected to the input terminal of TBOX controller (6) and one end of capacitor C2. The other end of capacitor C2 is grounded.

3. The dual flash lamp redundant high-side driver circuit of claim 2, wherein: The switching module (2) includes resistors R4, R5, and R6 and transistor Q2. One end of resistor R5 is connected to the output terminal of TBOX controller (6) and the other end is grounded. One end of resistor R6 is connected to the output terminal of TBOX controller (6) and the other end is connected to the base of transistor Q2. The emitter of transistor Q2 is grounded and the collector is connected to one end of resistor R4. The other end of resistor R4 is connected to the control terminal of protection drive module (3).

4. The dual flash lamp redundant high-side driver circuit of claim 3, wherein: The transistor Q2 is an NPN transistor.

5. The dual flash lamp redundant high-side driver circuit of claim 3, wherein: The protection drive module (3) includes a boost converter (31), resistors R1, R2, and R3, capacitor C1, transistor Q1, and MOSFET Q3. The input of the boost converter (31) is connected to the TBOX backup battery (7), and the output is connected to one end of resistor R1 and the emitter of transistor Q1. The other end of resistor R1 is connected to one end of resistor R2, one end of resistor R3, one end of capacitor C1, and the source of MOSFET Q3. The other end of resistor R2 is connected to the base of transistor Q1. The other end of resistor R3 is connected to the collector of transistor Q1, the other end of capacitor C1, the gate of MOSFET Q3, and the output of the switch module (2). The drain of MOSFET Q3 is connected to the power supply of the dual flashing lamp load (5).

6. The redundant high-side drive circuit for dual flash lamps according to claim 5, characterized in that: The protection drive module (3) also includes a diode D1, the anode of which is connected to the drain of the MOS transistor Q3, and the cathode of which is connected to the power supply terminal of the double flashing lamp load (5).

7. The dual flash lamp redundant high-side driver circuit of claim 5, wherein: The boost converter (31) adopts a BOOST boost circuit, the transistor Q1 is a PNP transistor, and the MOS transistor Q3 is a PMOS transistor.

8. The dual flash lamp redundant high-side driver circuit of any of claims 5-7, wherein: The resistors R3 and R1 satisfy: R3≥10R1; the resistors R3 and R4 satisfy: R3≥10R4; the resistance of the resistor R4 is greater than or equal to 10 times the resistance of the double flash load (5); the resistors R7, R9 and R3 satisfy: R7+R9≥10R3.

9. A dual flash lamp driving system comprising a main high-side driving circuit (4) connected to a power terminal of a dual flash lamp load (5), characterized in that: Also included is a dual flash lamp redundant high-side driver circuit as claimed in any one of claims 1 to 8.

10. A vehicle characterized by: Also included is a dual flash lamp drive system as claimed in claim 9.

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