Light drive system and engine system

Abstract

The present invention provides a lamp drive system and an engine system. The lamp drive system is integrated within a chip and includes at least one lamp drive module. The wire width of each lamp drive module is less than 120 μm. Each lamp drive module includes: a lamp control unit that outputs a drive control signal based on a fault detection signal and a serial lamp drive control signal from an SPI module; a driver unit that controls the operating state of the corresponding LED lamp bead based on the drive control signal; and a fault detection module that detects faults in the lamp drive module. Thus, the present invention integrates multiple lamp drive modules within the chip, enabling the chip to independently drive and detect faults for each LED lamp bead. While reducing peripheral circuitry, the chip offers improved reliability, reduced complexity, and lowered operating costs.

Description

Technical Field

[0001] The present invention relates to the field of small engines, and in particular to a lamp driving system and an engine system. Background Art

[0002] With increasingly stringent environmental regulations, motorcycle fuel systems are rapidly transitioning from traditional carburetor technology to electronically controlled injection (EFI). EFI achieves efficient fuel utilization and significantly reduces pollutant emissions by precisely controlling injection and ignition.

[0003] In motorcycle electronic fuel injection systems, the chip typically integrates a driver module for the fault indicator light. This module is solely responsible for providing the corresponding on / off drive function for the fault indicator light. Designed primarily to support the high current requirements of traditional light bulbs, the typical drive capability is up to 1.2A.

[0004] However, as LEDs gradually replace traditional bulbs as the mainstream choice for fault indicators, this high-current design is no longer feasible. Clearly, the driver module's functionality is simple and its current draw is excessive. To implement diagnostic functionality for the fault indicator, users must design complex peripheral circuitry and diagnostic circuits, increasing hardware costs and design complexity while also reducing system reliability.

[0005] Therefore, how to ensure the independent driving of the fault indicator light with good reliability, low complexity of the peripheral circuit and low power consumption has become a technical problem that urgently needs to be solved in the industry. Summary of the Invention

[0006] The present invention provides a lamp driving system and an engine system, which solve the technical problems of ensuring independent driving of a fault indicator light with good reliability, low complexity of peripheral circuits and low power consumption.

[0007] According to a first aspect of the present invention, an embodiment of the present invention provides a lamp driving system, the lamp driving system being integrated within a chip. The system includes N street lamp driving modules, each lamp driving module being configured to drive a corresponding LED lamp bead. The wire width of the lamp driving module is less than 120 μm, where N is an integer greater than or equal to 1.

[0008] The chip includes an SPI module, which is used to receive an SPI control signal and output a corresponding serial lamp driving control signal to each lamp driving module based on the SPI control signal;

[0009] The lamp driving module includes:

[0010] a lamp control unit, receiving the serial lamp drive control signal and the fault detection signal, and configured to output a drive control signal based on the serial lamp drive control signal and the fault detection signal;

[0011] A driving unit, comprising a high-side driver, a clamping sub-unit, and a first MOS transistor, wherein an input end of the high-side driver receives the driving control signal, and an output end thereof is respectively coupled to a first end of the clamping sub-unit and a control end of the first MOS transistor, a second end of the clamping sub-unit and a drain of the first MOS transistor are both coupled to a first node, the first node is further coupled to a first end of a corresponding LED lamp bead, and a source of the first MOS transistor is grounded;

[0012] A fault detection module, having a first end coupled to the source of the first MOS transistor, a second end coupled to the first node, and an output end coupled to the lamp control unit, for outputting the fault detection signal based on the current flowing through the source of the first MOS transistor and the voltage of the first node.

[0013] Optionally, the drive control signal includes an on-drive signal and an off-drive signal, and outputting the drive control signal based on the serial lamp drive control signal and the fault detection signal includes:

[0014] When the fault detection signal is normal and the serial lamp drive control signal is off, the lamp control unit outputs the on drive signal;

[0015] When the fault detection signal indicates normal and the serial lamp driving control signal indicates on, the lamp control unit outputs the on driving signal;

[0016] When the fault detection signal indicates an abnormality, the lamp control unit outputs the shutoff driving signal.

[0017] Optionally, the fault detection module is further configured to:

[0018] When the lamp control unit outputs the turn-on drive signal, outputting the fault detection signal based on the current flowing through the source of the first MOS transistor;

[0019] When the lamp control unit outputs the off driving signal, the fault detection signal is output based on the voltage of the first node.

[0020] Optionally, the method of outputting the fault detection signal based on the current flowing through the source of the first MOS transistor and the voltage of the first node includes:

[0021] When the lamp control unit outputs the turn-on drive signal, if the current flowing through the source of the first MOS transistor is greater than or equal to a first current threshold, outputting the fault detection signal indicating an abnormality;

[0022] When the lamp control unit outputs the on-drive signal, if the current flowing through the source of the first MOS transistor is less than the first current threshold, outputting the fault detection signal indicating that the lamp is normal;

[0023] When the lamp control unit outputs the shutdown driving signal, if the voltage of the first node does not fall within a second threshold voltage range, outputting the fault detection signal indicating an abnormality;

[0024] When the lamp control unit outputs the shutoff driving signal, if the voltage of the first node falls within the second threshold voltage range, the fault detection signal indicating normality is output.

[0025] Optionally, the fault detection signal includes an overcurrent detection signal, and the fault detection module includes an overcurrent detection unit; the overcurrent detection unit includes a first amplifier and a detection resistor;

[0026] A first end of the detection resistor is coupled to the source of the first MOS transistor, and a second end thereof is grounded;

[0027] The first input terminal of the first amplifier is coupled to the first terminal of the detection resistor, the second terminal thereof is coupled to the second terminal of the detection resistor, and the output terminal thereof is coupled to the lamp control unit for outputting the overcurrent detection signal.

[0028] Optionally, the light control unit is configured to:

[0029] Based on the overcurrent detection signal and the overcurrent filtering time, it is determined whether a circuit fault occurs, wherein:

[0030] If the overcurrent detection signal is abnormal and lasts longer than the overcurrent filtering time, it is determined that the circuit has an overcurrent and the shutdown drive signal is output.

[0031] Optionally, the fault detection signal includes an open circuit detection signal and a short circuit detection signal; the maximum value of the second threshold voltage range is a first set voltage, and the minimum value thereof is a second set voltage; the fault detection module includes an open circuit detection unit, a short circuit detection unit, and a voltage setting unit;

[0032] The voltage setting unit includes a second amplifier and a first switch, wherein a first input terminal of the second amplifier receives the first setting voltage, a second input terminal of the second amplifier is coupled to an output terminal of the second amplifier, an output terminal of the second amplifier is coupled to a first terminal of the first switch, and a second terminal of the first switch is coupled to the first node;

[0033] The open circuit detection unit includes a third amplifier, wherein a first input terminal of the third amplifier receives a third set voltage, a second input terminal of the third amplifier is coupled to the first terminal of the first switch, and an output terminal of the third amplifier is coupled to the lamp control unit, wherein the third set voltage is greater than the first set voltage;

[0034] The short circuit detection unit includes a fourth amplifier, a first input terminal of the fourth amplifier receives the second set voltage, a second input terminal of the fourth amplifier is coupled to the first terminal of the first switch, and an output terminal of the fourth amplifier is coupled to the lamp control unit.

[0035] Optionally, the light control unit is further coupled to the control end of the first switch, and the light control unit is configured as follows:

[0036] When the lamp control unit outputs the turn-off driving signal, the first switch is controlled to be turned on.

[0037] Optionally, the light control unit is configured to:

[0038] Based on the open circuit detection signal and the open circuit filtering time, it is determined whether a circuit fault occurs, wherein:

[0039] If the open circuit detection signal is abnormal and the duration is greater than the open circuit filtering time, it is determined that the circuit is open circuited and the shutdown drive signal is output; and

[0040] Based on the short-circuit detection signal and the short-circuit filtering time, it is determined whether a circuit fault occurs, wherein:

[0041] If the short-circuit detection signal is abnormal and lasts longer than the short-circuit filtering time, it is determined that a short circuit to ground occurs in the circuit, and the shutdown drive signal is output.

[0042] Optionally, each lamp driving module is used to provide a driving current less than or equal to 70mA to the corresponding LED lamp bead.

[0043] According to a second aspect of the present invention, an embodiment of the present invention provides an engine system, comprising a main control chip and a lamp driving system according to any one of the first aspects of the present invention;

[0044] The chip is electrically connected to a main control chip, and the main control chip is used to send the SPI control signal.

[0045] Optionally, the chip further includes:

[0046] a power supply module, configured to supply power to the chip and a sensor electrically connected to the chip;

[0047] A mode control module receives a key signal and is used to control the state of the chip to be an operating mode or a standby mode based on the key signal;

[0048] an injector driving module, coupled to the injector, for driving the injector when the chip is in a working mode;

[0049] a relay driving module, coupled to the relay, for driving the relay when the chip is in a working mode;

[0050] a rotation speed module, coupled to the tachometer, for outputting a rotation speed signal when the chip is in a working mode;

[0051] an oxygen heating module, configured to be coupled to an oxygen sensor heater and to drive the oxygen sensor heater when the chip is in an operating mode;

[0052] an idle stepper motor driving module, coupled to the idle stepper motor, and configured to drive the idle stepper motor when the chip is in a working mode;

[0053] a magnetoelectric signal processing module, configured to convert crankshaft magnetoelectric signals when the chip is in working mode;

[0054] K-LINE communication module, used to implement OBD communication.

[0055] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0056] The lamp drive system and engine system of the present invention include at least one lamp drive module, each having a wire width of less than 120 μm. Each lamp drive module includes: a lamp control unit that outputs a drive control signal based on a fault detection signal and a serial lamp drive control signal from an SPI module; a driver unit that controls the operating state of the corresponding LED lamp bead based on the drive control signal; and a fault detection module that detects faults in the lamp drive module. Thus, the present invention integrates multiple lamp drive modules within a chip, enabling the chip to independently drive and detect faults for each LED lamp bead. This reduces peripheral circuitry while also offering improved reliability, reduced complexity, and lowered operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0058] Figure 1 It is a structural diagram of an engine chip in the prior art;

[0059] Figure 2 is a schematic structural diagram of a chip provided by an embodiment of the present invention;

[0060] Figure 3 This is a schematic diagram of the structure of a lamp driving system provided by an embodiment of the present invention. Figure 1 ;

[0061] Figure 4 corresponds to Figure 3 The working waveform of the lamp driving system;

[0062] Figure 5 This is a schematic diagram of the structure of a lamp driving system provided by an embodiment of the present invention. Figure 2 ;

[0063] Figure 6 corresponds to Figure 5 The working waveform of the lamp driving system;

[0064] Figure 7 It is a schematic structural diagram of a chip provided in another embodiment of the present invention.

[0065] Reference numerals:

[0066] 11-SPI module;

[0067] 12-lamp driving system;

[0068] 13-bus;

[0069] 121-lamp driver module;

[0070] 1211-light control unit;

[0071] 12121-high side driver;

[0072] 12122-clamp subunit;

[0073] 1213-Fault detection module;

[0074] 12131-first amplifier;

[0075] 12132-second amplifier;

[0076] S1-first switch;

[0077] 12133-third amplifier;

[0078] 12134-fourth amplifier;

[0079] R sense - Sense resistor;

[0080] 1214-LED lamp beads;

[0081] M1-first MOS tube. DETAILED DESCRIPTION

[0082] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0083] The terms "first," "second," "third," "fourth," and the like (if any) in the description and claims of the present invention and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions, e.g., a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or apparatus.

[0084] The technical solution of the present invention is described in detail below with reference to specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0085] As described in the background art, it is difficult to achieve independent driving of a fault indicator light with good reliability and low complexity of the peripheral circuits in the existing technology.

[0086] Figure 1 It is a schematic diagram of the structure of the engine chip in an embodiment.

[0087] As you can see, the chip includes:

[0088] VDD module, used to power the engine chip;

[0089] The VDD follower module is used to power external sensors. Its voltage output VDD_TR follows the voltage output VDD of the VDD module.

[0090] KEY module, used to power on the chip;

[0091] Specifically, when the KEY signal is high, the chip enters the working mode;

[0092] When the KEY signal is low, the chip enters standby mode.

[0093] The SPI module is used for communication between the main chip and the engine chip to open the ignition switch and read diagnostic information.

[0094] Stepper Driver: used to drive the engine's idle air stepper motor.

[0095] Injector driver module (INJ), used to drive the engine's injectors.

[0096] The O2H module is used to drive the oxygen sensor heater and provide the necessary preheating function for the oxygen sensor to quickly enter the working state. The oxygen sensor is used for exhaust gas detection.

[0097] The relay driver module (Relay Driver) is used to drive the oil pump relay and other relays to realize the start and stop control of external devices (such as oil pumps, fans, etc.).

[0098] The LSD module is used to drive the fault light. When a system fault (such as overcurrent or short circuit) is detected, the fault light will be turned on to alert the user.

[0099] The speed output drive module (TACH) is used to drive the speed output. Specifically, it can drive the tachometer display to output the real-time engine speed signal.

[0100] K-line is used for OBD (On-Board Diagnostics) communication, transmitting diagnostic information and system status.

[0101] It can be seen that the LSD module can only be used to provide high driving current for the fault lamp, which makes this driving solution difficult to apply in modern electronic fuel injection engines.

[0102] This is because with the rapid development of LED technology, motorcycle fault lights have gradually changed from traditional bulbs to LED lights. LED lights have become the mainstream choice for fault indicator lights due to their advantages such as high brightness, low power consumption, long life and low cost.

[0103] In this case, the driving current of the LSD module is too high, which will lead to resource waste and increased power consumption.

[0104] Furthermore, because the LSD module only has a simple on / off function and lacks LED fault diagnosis capabilities, it fails to meet the intelligent and reliable requirements of modern vehicles. To implement fault indicator light diagnostics, chip users must design complex peripheral circuits and diagnostic circuits, which not only increases hardware cost and design difficulty, but also reduces system reliability.

[0105] In light of this, the present invention provides a lamp driver system integrated within a chip electrically connected to a main control chip. The system includes at least one lamp driver module, wherein the wire width of each lamp driver module is less than 120 μm. Each lamp driver module includes: a lamp control unit that outputs a drive control signal based on a serial lamp drive control signal and a fault detection signal; a driver unit that controls the operating state of the corresponding LED lamp bead based on the drive control signal; and a fault detection module that detects faults in the lamp driver module. Thus, the present invention integrates multiple lamp driver modules within the chip, enabling the chip to independently drive and detect faults for each LED lamp bead. This reduces peripheral circuitry while also offering improved reliability, reduced complexity, and lowered operating costs.

[0106] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0107] In the embodiments of the present invention, please refer to Figure 2 The lamp driving system 12 is integrated inside the chip 1. The system includes N street lamp driving modules 121. Each lamp driving module 121 is used to drive the corresponding LED lamp bead 1214. The line width of the wire in the lamp driving module 121 is less than 120um, where N is an integer greater than or equal to 1.

[0108] As can be seen, the present invention reduces the circuit area of ​​the lamp driver module 121 by limiting the wire width, thereby controlling the driving current flowing through the LED lamp beads 1214. Furthermore, since the driving current provided by the present invention is reduced, the area of ​​the driver tube can be reduced. Generally, the circuit area provided by the present invention can be reduced by about 35% compared to the circuit of the prior art, thereby improving chip utilization.

[0109] Taking into account the actual current demand of the LED lamp beads 1214 , in a preferred embodiment, each lamp driving module 121 is configured to provide a driving current less than or equal to 70 mA to the corresponding LED lamp bead 1214 .

[0110] The chip includes an SPI module 11 , which is used to receive an SPI control signal and output a corresponding serial lamp driving control signal to each lamp driving module 121 based on the SPI control signal.

[0111] In a specific embodiment, please continue to refer to Figure 2 , each lamp driving module 121 can communicate with the SPI module 11 through the bus 13.

[0112] In practical applications, the SPI module 11 has a register, and each lamp driving module 121 in the register corresponds to two SPI bits, and the values ​​of the two SPI bits are controlled by the SPI control signal.

[0113] Table 1 Status table of two SPI bits corresponding to the x-th lamp driving module 121

[0114]

[0115] Table 1 shows the bit operations corresponding to the xth lamp driver module 121 in the register and the corresponding serial lamp driver control signal status provided by an embodiment of the present invention. It can be seen that the operating status of each lamp driver module 121 is independently controlled. Here, x is an integer, and 1≤x≤N.

[0116] Each lamp driving module 121 of the present invention is controlled by a corresponding serial oxygen heating control signal.

[0117] The structure of a single lamp driving module 121 will now be further described.

[0118] Please refer to Figure 3 In a specific embodiment, the lamp driving module 121 includes:

[0119] The lamp control unit 1211 receives the serial lamp driving control signal and the fault detection signal, and is configured to output a driving control signal based on the serial lamp driving control signal and the fault detection signal;

[0120] A driving unit includes a high-side driver 12121, a clamping sub-unit 12122, and a first MOS transistor M1. The input end of the high-side driver 12121 receives the driving control signal, and the output end thereof is coupled to the first end of the clamping sub-unit 12122 and the control end of the first MOS transistor M1, respectively. The second end of the clamping sub-unit 12122 and the drain of the first MOS transistor M1 are both coupled to a first node, which is also coupled to the first end of the corresponding LED lamp bead 1214. The source of the first MOS transistor M1 is grounded.

[0121] The fault detection module 1213 has a first end coupled to the source of the first MOS transistor M1, a second end coupled to the first node, and an output end coupled to the lamp control unit 1211, and is used to output the fault detection signal based on the current flowing through the source of the first MOS transistor M1 and the voltage of the first node.

[0122] exist Figure 3 In the example, the clamping subunit 12122 includes a clamping diode. It should be understood that the present invention is not limited to the specific structure of the clamping subunit 12122. As long as the circuit can achieve the clamping function, it is within the protection scope of the present invention.

[0123] As an example, in Figure 3 In the example, the first MOS transistor M1 may be an NDMOS transistor. Of course, the present invention is not limited to a specific type of MOS transistor, and may also be a BJT transistor, etc. Those skilled in the art may select a suitable component as needed.

[0124] It can be seen that the present invention integrates multiple street lamp driving modules 121 inside the chip, so that the chip can meet the independent heating and independent fault detection of each LED lamp bead 1214. While reducing the peripheral circuit, it has better reliability and low complexity, thereby reducing the cost of use.

[0125] In this case, in a specific implementation, the driving control signal includes an on-driving signal and an off-driving signal.

[0126] Outputting a drive control signal based on the serial lamp drive control signal and the fault detection signal includes:

[0127] When the fault detection signal is normal and the serial lamp driving control signal is off, the lamp control unit 1211 outputs the on driving signal;

[0128] When the fault detection signal indicates normal and the serial lamp driving control signal indicates on, the lamp control unit 1211 outputs the on driving signal;

[0129] When the fault detection signal indicates an abnormality, the lamp control unit 1211 outputs the shutoff driving signal.

[0130] Now combined Figure 4 The change of the driving control signal is described. Figure 4 FIG1 shows a working waveform diagram of the light control unit 1211, wherein:

[0131] SPI can be understood as the serial lamp driving control signal corresponding to the lamp driving module 121;

[0132] LED can be understood as the driving control signal corresponding to the lamp driving module 121.

[0133] It can be seen that, for the lamp control unit 1211 , the LED lamp beads 1214 of the present invention are only controlled by the serial lamp driving control signal.

[0134] In one implementation, the fault detection module 1213 1213 performs different detections on the lamp driving module 121 when the lamp control unit 1211 outputs different driving control signals.

[0135] In this case, in a specific implementation, the fault detection module 1213 is further configured to:

[0136] When the lamp control unit 1211 outputs the on-drive signal, the fault detection signal is output based on the current flowing through the source of the first MOS transistor M1;

[0137] When the lamp control unit 1211 outputs the turn-off driving signal, the fault detection signal is output based on the voltage of the first node.

[0138] On this basis, the method for outputting the fault detection signal based on the current flowing through the source of the first MOS transistor M1 and the voltage of the first node includes:

[0139] When the lamp control unit 1211 outputs the on-drive signal, if the current flowing through the source of the first MOS transistor M1 is greater than or equal to the first current threshold, the fault detection signal indicating abnormality is output;

[0140] When the lamp control unit 1211 outputs the on-driving signal, if the current flowing through the source of the first MOS transistor M1 is less than the first current threshold, the fault detection signal indicating normal operation is output;

[0141] When the lamp control unit 1211 outputs the shutdown driving signal, if the voltage of the first node does not fall within the second threshold voltage range, the fault detection signal indicating abnormality is output;

[0142] When the lamp control unit 1211 outputs the shutoff driving signal, if the voltage of the first node falls within the second threshold voltage range, the fault detection signal indicating normal operation is output.

[0143] In an embodiment of the present invention, the maximum value of the second threshold voltage range is the first set voltage, and the minimum value thereof is the second set voltage.

[0144] The structure of the fault detection module 12131213 is now further explained.

[0145] In one implementation, the fault detection signal includes an overcurrent detection signal.

[0146] Please refer to Figure 5 The fault detection module 1213 includes an overcurrent detection unit; the overcurrent detection unit includes a first amplifier 12131 and a detection resistor R sense ;

[0147] The detection resistor R sense A first end of the transistor is coupled to the source of the first MOS transistor M1, and a second end of the transistor is grounded;

[0148] The first input terminal of the first amplifier 12131 is coupled to the detection resistor R sense The first end thereof is coupled to the detection resistor R sense The second end of the MOSFET has an output end coupled to the lamp control unit 1211 for outputting the overcurrent detection signal.

[0149] In this case, the light control unit 1211 is configured to:

[0150] Based on the overcurrent detection signal and the overcurrent filtering time, it is determined whether a circuit fault occurs, wherein:

[0151] If the overcurrent detection signal is abnormal and lasts longer than the overcurrent filtering time, it is determined that the circuit has an overcurrent and the shutdown drive signal is output.

[0152] The overcurrent filtering time is used to avoid false alarms and ensure the reliability of fault detection.

[0153] exist Figure 5 In the example, the fault detection signal also includes an open circuit detection signal and a short circuit detection signal.

[0154] The fault detection module 1213 also includes an open circuit detection unit, a short circuit detection unit and a voltage setting unit;

[0155] The voltage setting unit includes a second amplifier 12132 and a first switch S1. The first input terminal of the second amplifier 12132 receives the first setting voltage, and the second input terminal of the second amplifier 12132 is coupled to the output terminal of the second amplifier 12132. The output terminal of the second amplifier 12132 is coupled to the first terminal of the first switch S1. The second terminal of the first switch S1 is coupled to the first node.

[0156] The open circuit detection unit includes a third amplifier 12133, wherein a first input terminal of the third amplifier 12133 receives a third set voltage, a second input terminal of the third amplifier 12133 is coupled to the first terminal of the first switch S1, and an output terminal of the third amplifier 12133 is coupled to the lamp control unit 1211, wherein the third set voltage is greater than the first set voltage;

[0157] The short circuit detection unit includes a fourth amplifier 12134 , a first input terminal of the fourth amplifier 12134 receives the second set voltage, a second input terminal of the fourth amplifier 12134 is coupled to the first terminal of the first switch S1 , and an output terminal of the fourth amplifier 12134 is coupled to the lamp control unit 1211 .

[0158] exist Figure 5 In the example, the first set voltage is 0.5VDD, the second set voltage is 0.4VDD, and the third set voltage is 0.6VDD. The VDD can be understood as the power supply voltage of the chip.

[0159] Of course, the present invention is not limited thereto, and those skilled in the art can set the first set voltage, the second set voltage, and the third set voltage as needed.

[0160] On this basis, the voltage of the first node is detected only when the lamp control unit 1211 outputs the turn-off driving signal. Figure 5 The light control unit 1211 is further coupled to the control end of the first switch S1, and is configured as follows:

[0161] When the lamp control unit 1211 outputs the turn-off driving signal, the first switch S1 is controlled to be turned on.

[0162] In a preferred embodiment, the light control unit 1211 is further configured to:

[0163] Based on the open circuit detection signal and the open circuit filtering time, it is determined whether a circuit fault occurs, wherein:

[0164] If the open circuit detection signal is abnormal and the duration is greater than the open circuit filtering time, it is determined that the circuit is open circuited and the shutdown drive signal is output; and

[0165] Based on the short-circuit detection signal and the short-circuit filtering time, it is determined whether a circuit fault occurs, wherein:

[0166] If the short-circuit detection signal is abnormal and lasts longer than the short-circuit filtering time, it is determined that a short circuit to ground occurs in the circuit, and the shutdown drive signal is output.

[0167] The open-circuit filtering time and the short-circuit filtering time are used to avoid false alarms and ensure the reliability of fault detection.

[0168] Now combined Figure 6 The waveform of Figure 5 The working principle of the fault detection module 1213 of the present invention is described as follows. Figure 6 FIG1 shows a working waveform diagram of the fault detection module 1213, wherein:

[0169] V_LEDx, which can be understood as the voltage of the first node;

[0170] I_LEDx can be understood as the current flowing through the source of the first MOS tube M1;

[0171] LEDx can be understood as the actual driving control signal corresponding to the lamp driving module 121.

[0172] It can be seen that during the time period t1 to t2, the lamp driving module 121 is in a normal working state, the lamp control unit 1211 outputs the shutdown driving signal, the voltage of the first node is the system power supply voltage, and the current flowing through the source of the first MOS transistor M1 is the normal diagnostic current.

[0173] During the time period from t2 to t3, the lamp control unit 1211 outputs the on-driving signal, and the current flowing through the source of the first MOS transistor M1 increases rapidly and is equal to the first current threshold at time t3, and the lamp driving module 121 enters an overcurrent fault state;

[0174] During the time period t3 to t4, the lamp driving module 121 is continuously in the overcurrent fault state, and the duration is longer than the overcurrent filtering time, the lamp control unit 1211 outputs the shutdown driving signal to control the lamp driving module 121 to stop working;

[0175] The time period from t4 to t5 can be understood as the mask time (Tmask time), which is used to ignore the noise signal during the transition period. At this time, the lamp driving module 121 is in a stopped working state, and the voltage of the first node is a clamping voltage. Until the voltage of the first node recovers to the system power supply voltage, the current flowing through the source of the first MOS transistor M1M1 is a normal diagnostic current.

[0176] During the time period t5 to t6, the lamp driving module 121 is in a stopped working state, but the voltage of the first node drops to a third set voltage, and the lamp driving module 121 enters an open circuit fault state;

[0177] During the time period t6 to t7, the lamp driver module 121 is continuously in an open circuit fault state, the voltage of the first node is continuously greater than 0.5VDD, and the duration is greater than the open circuit filter time. The lamp control unit 1211 determines that the circuit is in an open circuit fault state and controls the lamp driver module 121 to stop working.

[0178] During the time period from t7 to t8, the voltage of the first node returns to the normal 0.5 VDD, and drops to 0.4 VDD at time t8, and the lamp driving module 121 enters a short-circuit fault state to ground;

[0179] During the time period from t8 to t9, the lamp driving module 121 is continuously in a short-circuit fault state to ground, the voltage of the first node is continuously less than 0.4VDD, and the duration is greater than the short-circuit filter time. The lamp control unit 1211 determines that the circuit is in a short-circuit fault state to ground and controls the lamp driving module 121 to stop working.

[0180] As can be seen from the above content, the fault detection signal in the present invention can inform the lamp control unit 1211 of specific fault information, so that the lamp control unit 1211 can output a corresponding driving control signal as needed.

[0181] In summary, the present invention provides a lamp driver system 12 comprising at least one lamp driver module 121. The wire width of each lamp driver module 121 is less than 120 μm. Each lamp driver module 121 includes: a lamp control unit that outputs a drive control signal based on a fault detection signal and a serial lamp drive control signal from an SPI module; a driver unit that controls the operating state of a corresponding LED lamp bead 1214 based on the drive control signal; and a fault detection module 1213 that performs fault detection on the lamp driver module 121. Thus, the present invention integrates multiple lamp driver modules 121 within a chip, enabling the chip to independently drive and detect faults for each LED lamp bead 1214. This reduces peripheral circuitry while improving reliability, reducing complexity, and lowering operating costs.

[0182] In addition, the present invention also provides an engine system, comprising a main control chip and the lamp driving system 12 as described in any one of the above items.

[0183] Since the lamp driving system 12 of the present invention is integrated into a chip, in actual application, the chip is electrically connected to a main control chip, and the main control chip is used to send the SPI control signal.

[0184] In practical applications, the engine system may have multiple chips. For example, the chip of the present invention may be an engine chip. Of course, the present invention does not limit the integration position of the lamp driving system 12. Those skilled in the art may select a suitable position as needed.

[0185] As an example, see Figure 7 , the chip in the embodiment of the present invention may further include:

[0186] A power supply module 13, configured to supply power to the chip and sensors electrically connected to the chip;

[0187] A mode control module 14 receives a key signal KEY and is configured to control the chip to be in a working mode or a standby mode based on the key signal KEY;

[0188] an injector driving module 15, coupled to the injector, for driving the injector when the chip is in working mode;

[0189] a relay driving module 16 , coupled to the relay, for driving the relay when the chip is in a working mode;

[0190] a rotation speed module 17, coupled to the tachometer, for outputting a rotation speed signal when the chip is in working mode;

[0191] an oxygen heating module 18 , configured to be coupled to an oxygen sensor heater and to drive the oxygen sensor heater when the chip 1 is in a working mode;

[0192] an idle stepper motor driving module 19, coupled to the idle stepper motor, for driving the idle stepper motor when the chip is in working mode;

[0193] a magnetoelectric signal processing module 20 for converting crankshaft magnetoelectric signals when the chip is in working mode;

[0194] The K-LINE communication module 21 is used to implement OBD communication.

[0195] In summary, the embodiment of the present invention integrates multiple street lamp driving modules 121 inside the chip, so that the chip can meet the independent driving and independent fault detection of each LED lamp bead 1214. While reducing the peripheral circuit, it has better reliability, lower complexity, and reduced usage costs.

[0196] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A lamp driving system, characterized in that: The lamp driving system is integrated inside the chip. The system includes N street lamp driving modules, each of which is used to drive a corresponding LED lamp bead. The wire width of the lamp driving module is less than 120 μm, where N is an integer greater than or equal to 1. The chip includes an SPI module, which is used to receive an SPI control signal and output a corresponding serial lamp driving control signal to each lamp driving module based on the SPI control signal; The lamp driving module includes: a lamp control unit, receiving the serial lamp drive control signal and the fault detection signal, and configured to output a drive control signal based on the serial lamp drive control signal and the fault detection signal; A driving unit, comprising a high-side driver, a clamping sub-unit, and a first MOS transistor, wherein an input end of the high-side driver receives the driving control signal, and an output end thereof is respectively coupled to a first end of the clamping sub-unit and a control end of the first MOS transistor, a second end of the clamping sub-unit and a drain of the first MOS transistor are both coupled to a first node, the first node is further coupled to a first end of a corresponding LED lamp bead, and a source of the first MOS transistor is grounded; A fault detection module, having a first end coupled to the source of the first MOS transistor, a second end coupled to the first node, and an output end coupled to the lamp control unit, for outputting the fault detection signal based on the current flowing through the source of the first MOS transistor and the voltage of the first node.

2. The lamp driving system according to claim 1, wherein: The driving control signal includes an on-driving signal and an off-driving signal, and outputting a driving control signal based on the serial lamp driving control signal and the fault detection signal includes: When the fault detection signal is normal and the serial lamp drive control signal is off, the lamp control unit outputs the on drive signal; When the fault detection signal indicates normal and the serial lamp driving control signal indicates on, the lamp control unit outputs the on driving signal; When the fault detection signal indicates an abnormality, the lamp control unit outputs the shutoff driving signal.

3. The lamp driving system according to claim 2, wherein: The fault detection module is further configured to: When the lamp control unit outputs the turn-on drive signal, outputting the fault detection signal based on the current flowing through the source of the first MOS transistor; When the lamp control unit outputs the off driving signal, the fault detection signal is output based on the voltage of the first node.

4. The lamp driving system according to claim 3, wherein: The method for outputting the fault detection signal based on the current flowing through the source of the first MOS transistor and the voltage of the first node includes: When the lamp control unit outputs the turn-on drive signal, if the current flowing through the source of the first MOS transistor is greater than or equal to a first current threshold, outputting the fault detection signal indicating an abnormality; When the lamp control unit outputs the on-drive signal, if the current flowing through the source of the first MOS transistor is less than the first current threshold, outputting the fault detection signal indicating that the lamp is normal; When the lamp control unit outputs the shutdown driving signal, if the voltage of the first node does not fall within a second threshold voltage range, outputting the fault detection signal indicating an abnormality; When the lamp control unit outputs the shutoff driving signal, if the voltage of the first node falls within the second threshold voltage range, the fault detection signal indicating normality is output.

5. The lamp driving system according to claim 4, wherein: The fault detection signal includes an overcurrent detection signal, and the fault detection module includes an overcurrent detection unit; the overcurrent detection unit includes a first amplifier and a detection resistor; A first end of the detection resistor is coupled to the source of the first MOS transistor, and a second end thereof is grounded; The first input terminal of the first amplifier is coupled to the first terminal of the detection resistor, the second terminal thereof is coupled to the second terminal of the detection resistor, and the output terminal thereof is coupled to the lamp control unit for outputting the overcurrent detection signal.

6. The lamp driving system according to claim 5, wherein: The lamp control unit is configured to determine whether a circuit fault occurs based on the overcurrent detection signal and the overcurrent filtering time, wherein: If the overcurrent detection signal is abnormal and lasts longer than the overcurrent filtering time, it is determined that the circuit has an overcurrent and the shutdown drive signal is output.

7. The lamp driving system according to claim 4, wherein: The fault detection signal includes an open circuit detection signal and a short circuit detection signal; the maximum value of the second threshold voltage range is a first set voltage, and the minimum value thereof is a second set voltage; the fault detection module includes an open circuit detection unit, a short circuit detection unit, and a voltage setting unit; The voltage setting unit includes a second amplifier and a first switch, wherein a first input terminal of the second amplifier receives the first setting voltage, a second input terminal of the second amplifier is coupled to an output terminal of the second amplifier, an output terminal of the second amplifier is coupled to a first terminal of the first switch, and a second terminal of the first switch is coupled to the first node; The open circuit detection unit includes a third amplifier, wherein a first input terminal of the third amplifier receives a third set voltage, a second input terminal of the third amplifier is coupled to the first terminal of the first switch, and an output terminal of the third amplifier is coupled to the lamp control unit, wherein the third set voltage is greater than the first set voltage; The short circuit detection unit includes a fourth amplifier, a first input terminal of the fourth amplifier receives the second set voltage, a second input terminal of the fourth amplifier is coupled to the first terminal of the first switch, and an output terminal of the fourth amplifier is coupled to the lamp control unit.

8. The lamp driving system according to claim 7, wherein: The light control unit is further coupled to the control terminal of the first switch, and is configured to: When the lamp control unit outputs the turn-off driving signal, the first switch is controlled to be turned on.

9. The lamp driving system according to claim 7, wherein: The lamp control unit is configured to determine whether a circuit fault occurs based on the open circuit detection signal and the open circuit filtering time, wherein: If the open circuit detection signal is abnormal and the duration is greater than the open circuit filtering time, it is determined that the circuit is open circuited and the shutdown drive signal is output; and Based on the short-circuit detection signal and the short-circuit filtering time, it is determined whether a circuit fault occurs, wherein: If the short-circuit detection signal is abnormal and lasts longer than the short-circuit filtering time, it is determined that a short circuit to ground occurs in the circuit, and the shutdown drive signal is output.

10. The lamp driving system according to claim 1, wherein: Each lamp driving module is used to provide a driving current less than or equal to 70mA to the corresponding LED lamp bead.

11. An engine system, characterized in that: It comprises a main control chip and a lamp driving system according to any one of claims 1 to 10; The chip is electrically connected to a main control chip, and the main control chip is used to send the SPI control signal.

12. The engine system according to claim 11, wherein: The chip further includes: a power supply module, configured to supply power to the chip and a sensor electrically connected to the chip; A mode control module receives a key signal and is used to control the state of the chip to be an operating mode or a standby mode based on the key signal; an injector driving module, coupled to the injector, for driving the injector when the chip is in a working mode; a relay driving module, coupled to the relay, for driving the relay when the chip is in a working mode; a rotation speed module, coupled to the tachometer, for outputting a rotation speed signal when the chip is in a working mode; an oxygen heating module, configured to be coupled to an oxygen sensor heater and to drive the oxygen sensor heater when the chip is in an operating mode; an idle stepper motor driving module, coupled to the idle stepper motor, and configured to drive the idle stepper motor when the chip is in working mode; a magnetoelectric signal processing module, configured to convert crankshaft magnetoelectric signals when the chip is in working mode; K-LINE communication module, used to implement OBD communication.

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