Power supply device for airbag firing actuators, system

Abstract

The present disclosure relates to a power supply device and system of an airbag ignition actuator. The device provided by the present disclosure implements frequency modulation control on the internal resonant circuit unit through a preset algorithm in the clock module, dynamically adjusts the modulation parameters, monitors and feeds back the real-time modulation clock signal, effectively guarantees the stability of the modulation clock signal, and avoids frequency exceeding the preset stable interval. In the main power module of the power supply module, the architecture of the boost power supply, the system-level step-down power supply, multiple candidate power supplies and the multiplexer realizes multi-stage conversion and flexible selection of voltage, the actuator charging unit can guarantee the ignition energy supply, and the main power module provides the modulation clock signal, thereby building a bidirectional support of power supply and timing, significantly improving the adaptation ability of the device to complex working conditions, avoiding system failure caused by single module abnormal working, and ensuring stable and reliable operation of the airbag ignition actuator.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of automotive electronic chip, in particular to a power supply device and system of airbag ignition executor. BACKGROUND

[0002] As an auxiliary protection system on the car, the airbag system, in combination with the seat belt, can provide effective anti-collision protection for the driver and passengers when the car is hit, effectively reducing the casualty rate.

[0003] As an auxiliary protection system on the car, the airbag system, in combination with the seat belt, can provide effective anti-collision protection for the driver and passengers when the car is hit, effectively reducing the casualty rate. Among them, the power supply device of the airbag ignition executor is the core component to ensure the normal work of the airbag system, which needs to provide stable and reliable power supply for the ignition executor, microcontroller (MCU, Microcontroller Unit), clock module and other key components, and at the same time, the clock module needs to provide accurate timing reference to ensure the accurate execution of key operations such as collision intensity calculation and ignition instruction triggering.

[0004] However, the working conditions of the car during driving are complex and changeable, and the power supply device is easily affected by various external disturbances, such as load mutation caused by the start-stop of vehicle-mounted electrical appliances, external electromagnetic radiation coupling, electromagnetic interference generated by the ignition system, etc. These disturbances may cause abnormality such as transient fluctuation and sharp pulse of power supply voltage, and if not effectively handled, may cause problems such as power module false triggering and system false reset; at the same time, if the clock signal is disturbed by electromagnetic interference, frequency deviation and loss may occur, resulting in timing disorder and affecting the timely triggering of the ignition instruction.

[0005] In the prior art, the power supply device and clock module of the airbag ignition executor often lack deep collaborative design, the anti-interference ability of the power supply is insufficient, the clock modulation method is single, and the power-on sequence lacks strict control, which is difficult to adapt to the complex needs of the whole working condition of the car. For example, the voltage monitoring result of the power module is not dynamically linked with the frequency modulation parameter of the clock module, and the anti-interference ability of the clock signal is limited; the candidate power supply switching of the power module lacks flexible adaptation mechanism, and cannot balance energy efficiency and power supply stability according to different load demands; the simultaneous start of multiple modules in the power-on process may cause large current impact, affecting the system stability readiness. These problems may cause the airbag ignition executor to malfunction, which greatly endangers the life safety of the driver and passengers.

[0006] Therefore, there is an urgent need for a power supply device and system of airbag ignition executor with high anti-interference ability, flexible adaptability and high reliability to solve the above technical problems. SUMMARY

[0007] The present disclosure provides a power supply device for an airbag firing actuator, and a system, and at least one embodiment can improve the anti-interference ability, adaptability and reliability of the system by deep coordination design of a power module and a clock module, and ensure stable operation of the airbag firing actuator under complex working conditions. The technical solutions of the present disclosure include the following:

[0008] According to a first aspect of an embodiment of the present disclosure, a power supply device for an airbag firing actuator is provided, comprising:

[0009] The device comprises a power module and a clock module, wherein the clock module comprises a frequency modulation control unit, an internal resonant circuit unit and a clock monitoring unit, the frequency modulation control unit is connected with the internal resonant circuit unit and the clock monitoring unit, is used to generate a control instruction according to a preset algorithm, the control instruction is used to modulate and control the internal resonant circuit unit, and is also used to adjust the parameters of frequency modulation control based on the monitoring feedback signal fed back by the clock monitoring unit and / or the monitoring result of voltage; the internal resonant circuit unit is used to generate a clock signal, and perform corresponding frequency modulation based on the control instruction and output a modulated clock signal after frequency modulation; the clock monitoring unit is connected with the internal resonant circuit unit, is used to monitor the received modulated clock signal, and send a monitoring feedback signal to the frequency modulation control unit when detecting that the frequency of the modulated clock signal exceeds a preset stable interval range;

[0010] The power module comprises a main power module and a voltage monitoring module, wherein the main power module comprises a boost power supply, an actuator charging unit connected with the boost power supply, a system-level step-down power supply connected with the boost power supply, a plurality of candidate power supplies connected with the system-level step-down power supply, and one or more multiplexers connected with the plurality of candidate power supplies and used to select the candidate power supplies to output the voltage of the corresponding candidate power supply; the voltage monitoring module is connected with the voltage output end of the main power module, is used to feed back the monitoring result of voltage to the main power module and / or the clock module, so that the main power module and / or the clock module perform corresponding control processing;

[0011] The clock module is connected with the power supply in the main power module, and is used to provide a modulated clock signal for the power supply in the main power module.

[0012] In some embodiments of the device, the modulation control processing of the internal resonant circuit unit comprises at least one of the following:

[0013] The frequency calibration port of the internal resonant circuit unit is controlled to change with a random number sequence;

[0014] The center frequency point of the internal resonant circuit unit is linearly increased or decreased by a preset step size;

[0015] The period of frequency modulation is controlled;

[0016] The bandwidth of frequency adjustment is controlled.

[0017] In some embodiments of the device, the preset step size is configured to be adjustable for adjusting the preset step size in response to change information of application working condition scenarios.

[0018] In some embodiments of the device, the main power module further includes an internal voltage regulator connected with the system-level voltage reduction power supply, and the power supply is derived from a chip main power supply or a system-level voltage reduction voltage, the plurality of candidate power supplies include: a dedicated level voltage reduction power supply connected with the system-level voltage reduction power supply, and a microcontroller power supply connected with the system-level voltage reduction power supply and the internal voltage regulator, and the dedicated level voltage reduction power supply and the microcontroller power supply are connected with a first multiplexer.

[0019] In some embodiments of the device, the main power module further includes a reference reset unit connected with the internal voltage regulator, for generating a power-on reset signal, and generating a plurality of bandgap reference voltages, one of which is used as a reference voltage for the voltage monitoring module to monitor the bandgap reference voltages of different power supplies, and the plurality of bandgap reference voltage sources are connected with a second multiplexer.

[0020] In some embodiments of the device, the internal voltage regulator is configured to include a shield mode, in which the chip is prohibited from entering a sleep mode by shielding the level input of the input and output port.

[0021] In some embodiments of the device, the power-on sequence of the main power module is: chip main power supply, boost voltage, internal voltage, reference reset unit, microcontroller power supply, and ignition actuator charging unit.

[0022] In some embodiments of the device, the power module further includes a filter connected with the output end of the voltage monitoring module, a reset source, a register, and a power enable switch in the main power module, the filter is used for digitally filtering the power monitoring results of the voltage monitoring module, and according to the digitally filtered results, the power enable switch is controlled or the reset source is controlled to reset the system or store alarm information of abnormal voltage.

[0023] In some embodiments of the device, the filter time of the filter is configured to be adjustable, and the filter time is adjusted in response to change information of application working condition scenarios.

[0024] According to a second aspect of the embodiments of the present disclosure, a power supply system of an airbag firing actuator is provided, comprising: a clock system and a power supply system, which realize the power supply device of the airbag firing actuator according to any of the embodiments of the present disclosure;

[0025] According to a third aspect of the embodiments of the present disclosure, a computer readable storage medium is further provided, when instructions in the computer readable storage medium are executed by a processor of an electronic device, the clock system comprises the clock device of the airbag firing actuator according to any of the embodiments of the present disclosure, and the power supply system comprises the power supply device of the airbag firing actuator according to any of the embodiments of the present disclosure.

[0026] According to the embodiments of the present disclosure, the power supply device of the airbag firing actuator is designed in cooperation with the clock module and the power supply module, high reliability and strong adaptability are realized: the frequency modulation control unit in the clock module modulates and controls the internal resonant circuit unit through a preset algorithm, dynamically adjusts the modulation parameters in combination with the feedback signal of the clock monitoring unit and the voltage monitoring result, cooperates with the real-time monitoring and abnormal feedback of the clock monitoring unit on the modulated clock signal, effectively guarantees the stability of the modulated clock signal, and avoids the frequency exceeding the preset stable interval; the main power supply module in the power supply module realizes multi-stage conversion and flexible selection of voltage through the architecture of the boost power supply, the system-level buck power supply, the multiple candidate power supplies and the multiplexer, the actuator charging unit can guarantee the supply of firing energy, and the voltage monitoring module feeds back the monitoring result to the main power supply module and / or the clock module, realizing the linkage control of the two; at the same time, the clock module provides the modulated clock signal for the main power supply module, builds a bidirectional support of power supply and timing, significantly improves the adaptability of the device to complex working conditions, avoids system failure caused by abnormal work of a single module, and ensures the stable and reliable operation of the airbag firing actuator.

[0027] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings herein are incorporated into the specification and form part of the specification, show embodiments consistent with the present disclosure, and together with the specification serve to explain the principles of the present disclosure, and do not constitute undue limitation on the present disclosure.

[0029] Figure 1 is a system structure schematic diagram of a power supply device of an airbag firing actuator according to an exemplary embodiment;

[0030] Figure 2 is a flowchart of a power supply device of an airbag firing actuator according to an exemplary embodiment;

[0031] Figure 3This is a schematic diagram of the structure of a power supply device embodiment that implements an airbag ignition actuator provided in this disclosure;

[0032] Figure 4 This is a schematic diagram illustrating a power-on sequence according to an exemplary embodiment. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solutions of this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, product, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, product, or apparatus. Without further limitation, the presence of other identical or equivalent elements in a process, method, product, or apparatus that includes said elements is not excluded. For example, the use of terms such as "first" and "second" is to denote names and does not indicate any specific order. Features defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this disclosure, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. When direction is mentioned in the description of this disclosure, the direction is relative, not absolute, and is only used to explain the relative positional relationships and motion of components in a specific orientation. When the specific orientation changes, the direction indication may also change accordingly.

[0035] This disclosure provides a power supply device for an airbag ignition actuator, which can be applied to, for example... Figure 1 In the implementation scenario shown. Figure 1According to an example embodiment, a power supply system structure diagram of a power supply device for implementing an airbag ignition actuator is shown. The system can be divided into multiple modules or units according to physical or logical functions, or a certain functional module can also include multiple units that implement specific functions. In some specific embodiments, the device can include a processor unit (dashed part), which can include at least one processor, can be connected with the power supply device, and can implement frequency modulation control, parameter adjustment, power supply enable / disable in the power supply module, signal monitoring / processing / feedback, etc. in the power supply device. The processor can store / load / execute executable instructions of a pre-constructed algorithm to implement the functions of the modules or units described in any embodiment of the present disclosure. The processor can have functions of data receiving, processing, storage, sending, etc., and can interact with other devices or units. The processor can include a local terminal processor such as an MCU (Microcontroller Unit), and can also include a remote server processor. In some embodiments, the local processor and the remote server processor can jointly assist in determining the optical attenuation characteristics of the display device. The processor can be integrated into various terminal devices, and the terminal devices described in the present disclosure can include but are not limited to vehicle-mounted devices, personal computers, notebook computers, smart phones, tablet computers, wearable devices, medical devices, VR (Virtual Reality) virtual devices, etc. The server can be a single server, a server cluster, a distributed system, a cloud processing platform, a server containing a blockchain node, and a combination of the above devices. The processor described in the present disclosure can include various control units that can implement logical processing functions, including but not limited to CPU (Central Processing Unit), PLC (Programmable Logic Controller), ECU (Electronic Control Unit), MCU (Microcontroller Unit), etc., as well as one or more logical function units, chips, etc. combination of controllers.

[0036] To more clearly illustrate the technical solutions of the present disclosure, some embodiments provided by the present disclosure are described below in conjunction with the implementation scenarios shown in the accompanying drawings. As shown in the accompanying drawings, the device can include a power supply module 200 and a clock module 100. Figure 1 Figure 1

[0037] ​​The clock module 100 comprises a frequency modulation control unit 10, an internal resonator circuit unit 12 (also referred to as IRC, Internal Resonator Circuit, a chip internal crystal oscillator module, which can generate a basic clock signal and can perform frequency modulation based on a received control instruction), a clock monitoring unit 13, the frequency modulation control unit 10 is connected with the internal resonator circuit unit 12 and the clock monitoring unit 13, and is used to generate a control instruction according to a preset algorithm, the control instruction is used to perform modulation control processing on the internal resonator circuit unit 12, and is also used to adjust the frequency modulation control parameters based on the monitoring feedback signal fed back by the clock monitoring unit 13 and / or the monitoring result of the voltage; the internal resonator circuit unit 12 is used to generate a clock signal, perform corresponding frequency modulation based on the control instruction, and output a modulated clock signal after frequency modulation; the clock monitoring unit 13 is connected with the internal resonator circuit unit 12, and is used to monitor the received modulated clock signal, and send a monitoring feedback signal to the frequency modulation control unit 10 when it is detected that the frequency of the modulated clock signal exceeds a preset stable interval range;

[0038] The power module 200 comprises a main power module 20 and a voltage monitoring module 22, wherein the main power module 20 comprises a boost power supply, an actuator charging unit connected with the boost power supply, a system-level step-down power supply connected with the boost power supply, a plurality of candidate power supplies (such as a candidate power supply 1, a candidate power supply 2, etc.) connected with the system-level step-down power supply, and one or more multiplexers (MUX, Multiplexer) connected with the plurality of candidate power supplies, which are used to select the candidate power supplies to output the voltage of the corresponding candidate power supply; the voltage monitoring module 22 is connected with the voltage output end of the main power module, and is used to feed back the monitoring result of the voltage to the main power module and / or the clock module, so that the main power module and / or the clock module perform corresponding control processing;

[0039] The clock module 100 is connected with the power supply in the main power module 20, and is used to provide a modulated clock signal for the power supply in the main power module 20.

[0040] In this embodiment, the power supply device of the airbag ignition executor is designed by the clock module and the power module, realizing high reliability and strong adaptability: the frequency modulation control unit in the clock module modulates and controls the internal resonant circuit unit through a preset algorithm, dynamically adjusts the modulation parameters combined with the feedback signal of the clock monitoring unit and the voltage monitoring result, cooperates with the real-time monitoring and abnormal feedback of the clock monitoring unit to the modulated clock signal, effectively guarantees the stability of the modulated clock signal, and avoids the frequency exceeding the preset stable interval; the main power module in the power module realizes multi-stage conversion and flexible selection of voltage through the architecture of the boost power supply, the system-level step-down power supply, multiple candidate power supplies and the multiplexer, the executor charging unit can guarantee the ignition energy supply, the voltage monitoring module feeds back the monitoring result to the main power module and / or the clock module, realizing the linkage control of the two; at the same time, the clock module provides the modulated clock signal for the main power module, building the bidirectional support of power supply and timing, significantly improving the adaptability of the device to complex working conditions, avoiding the system failure caused by the abnormal working of a single module, and ensuring the stable and reliable operation of the airbag ignition executor.

[0041] In some embodiments, the clock module 100 can include a frequency modulation control unit 10, an internal resonant circuit unit (IRC) 12, and a clock monitoring unit 13 (CMU), which form a closed-loop control to ensure stable output and anti-interference capability of the clock signal.

[0042] The frequency modulation control unit 10 can be connected to the internal resonant circuit unit and the clock monitoring unit as the core control component of the clock module. Its functions or execution steps include:

[0043] Generating control instructions according to a preset algorithm to perform multi-dimensional modulation control processing on the internal resonant circuit unit;

[0044] Real-time receiving of the monitoring feedback signal fed back by the clock monitoring unit and the voltage monitoring result output by the voltage monitoring module, dynamic adjustment of the frequency modulation control parameters, and realization of the collaborative adaptation of the clock module and the power module.

[0045] The internal resonant circuit unit 12, i.e. the crystal oscillator module inside the chip, is used to generate a basic clock signal and perform corresponding frequency modulation based on the control instructions of the frequency modulation control unit, and finally output a modulated clock signal.

[0046] The clock monitoring unit 13 is connected to the internal resonant circuit unit and real-time receives and monitors the modulated clock signal. When it is detected that the frequency of the modulated clock signal exceeds the preset stable interval range, it sends a monitoring feedback signal to the frequency modulation control unit to trigger the frequency modulation control unit to adjust the modulation parameters, so as to ensure that the clock frequency returns to the stable interval and avoid timing disorder.

[0047] The power module 200 can include a main power module 20, which can adopt a multi-stage power architecture + multiplexer design, and a voltage monitoring module 22, which can realize accurate monitoring and feedback control, to jointly ensure stable power supply.

[0048] The main power module 20 can include a boost power supply (also referred to as a BOOST power supply or BOOST circuit), an actuator charging unit, a system-level buck power supply (BUCK power supply, also referred to as a step-down power supply, the system-level buck power supply can be referred to as SYS BUCK), a plurality of candidate power supplies, and one or more multiplexers (MUX, Multiplexer, selector). Each component is started in a predetermined power-on sequence to ensure system stability. The specific structure and functions include:

[0049] The boost power supply is connected to the chip main power supply and is used for boost processing of the chip main power supply. On the one hand, it can supply power to the actuator charging unit, and on the other hand, it can serve as a main power supply source for the system-level buck power supply to meet the power supply needs of high-voltage domain devices.

[0050] The actuator charging unit is connected to the boost power supply and works in the high-voltage domain. After the chip is powered on, the charging is controlled by software instructions. After the charging is completed, the stored energy can be released in the case of main power supply failure to ensure the ignition energy supply of the airbag ignition actuator and realize safety redundancy.

[0051] The system-level buck power supply is connected to the boost power supply and reduces the high voltage output by the boost power supply to a general intermediate voltage to provide stable input for subsequent modules such as internal voltage regulator, special-level buck power supply, and microcontroller power supply.

[0052] The plurality of candidate power supplies include a special-level buck power supply (also referred to as VCC BUCK) and a microcontroller power supply (LDOTO MCU). LDO (Low Dropout Regulator), also known as low dropout linear regulator, has low output ripple and low noise characteristics. Some embodiments of the present disclosure can include internal voltage regulator, microcontroller power supply, etc. In addition, the POR (Power-On Reset) in some embodiments of the present disclosure receives digital main power supply and analog main power supply generated from the internal LDO, generates a power-on reset signal, and generates two bandgap reference voltages. BANDGAP represents bandgap reference voltage, IO (Input / Output) represents input / output port, PG (Power Good) represents power good signal, and step represents step length.

[0053] The dedicated level voltage reduction power supply is connected with the system level voltage reduction power supply, and further reduces the intermediate voltage to supply power for the external MCU; the microcontroller power supply is connected with the system level voltage reduction power supply and the internal voltage stabilization power supply, and has small ripple and low noise. The dedicated level voltage reduction power supply and the microcontroller power supply are connected with the first multiplexer, and can flexibly switch the power supply path according to the working requirement (such as efficiency priority or low noise priority) of the external MCU.

[0054] The multiplexer can include the first multiplexer and the second multiplexer. The first multiplexer realizes switching of the dedicated level voltage reduction power supply and the microcontroller power supply, and the second multiplexer realizes redundant switching of the multiple band gap reference voltages, and ensures that the system can still work normally when a single reference source fails.

[0055] As shown in Figure 3 , the power supply device for the airbag ignition executor provided by the present disclosure includes a voltage monitoring module, a main power supply module, a clock module, a filter, a reset source, a register, a power supply enable switch, and a filter. Figure 3 The voltage monitoring module is connected with the voltage output end of the main power supply module, and monitors the output voltage state of each power supply module in real time, and feeds back the monitoring result to the main power supply module and / or the clock module. The feedback signal provides a basis for the enable control and fault processing of the power supply module, and provides a reference for the frequency modulation parameter adjustment of the clock module, so as to realize the coordinated adaptation of the power supply and the clock.

[0056] The filter can adopt a sliding average or median filtering algorithm to perform smoothing processing on the original voltage data collected by the voltage monitoring module, filter out the voltage fluctuation caused by short-term interference, avoid problems such as power supply false shutdown and system false reset caused by instantaneous voltage fluctuation, and ensure the authenticity of the voltage monitoring result. The three control logics can take differential processing for voltage abnormalities of different severity, which can avoid system shutdown caused by slight abnormalities, and quickly cut off the risk in serious abnormalities, so as to ensure the safety of the core function.

[0057] In other embodiments of the device provided in this disclosure, the filtering duration of the filter is configured to be adjustable, and the filtering duration is adjusted accordingly in response to changes in the application operating conditions. The filter can automatically or manually adjust its filtering duration in response to changes in the application operating conditions. For example, a longer filtering duration (500µs-1ms) is configured for operating conditions with high interference intensity (such as high-speed driving or frequent electromagnetic interference) to enhance anti-interference capability, while a shorter filtering duration (100µs-300µs) is configured for operating conditions with low interference intensity (such as low-speed driving or sleep mode) to improve the response speed to abnormal voltages. This allows for precise filtering duration configuration for different operating conditions, reducing false abnormality triggers due to insufficient filtering or missed detection of real abnormalities due to excessive filtering, thus ensuring the reliability of the feedback control logic.

[0058] In some embodiments, the power module 200 may also include a filter connected to the output of the voltage monitoring module, a reset source, a register, and a power enable switch in the main power module. The filter is used to digitally filter the power monitoring results of the voltage monitoring module and, based on the digitally filtered results, control the power enable switch or the reset source to perform a system reset or store alarm information for abnormal voltage. The filter is connected to the output of the voltage monitoring module and also to the reset source, the register, and the power enable switch in the main power module. Based on the digitally filtered results, the filter can achieve at least three control functions: controlling the on / off state of the power enable switch to shut down the abnormal power module; controlling the reset source to trigger a system reset to prevent the module from operating abnormally under undervoltage conditions; and storing alarm information for abnormal voltage in the register to provide a basis for fault diagnosis. One of the core functions of this filter is to digitally filter the voltage monitoring results, filtering out short-term voltage fluctuations caused by external interference and preventing false abnormal signals from triggering malfunctions. The filter duration is configurable and can be flexibly adjusted in response to changes in application conditions. For example, a longer filter duration can be configured when driving at high speed or when there is frequent electromagnetic interference, while a shorter filter duration can be configured when driving at low speed or when there is less interference, thus balancing anti-interference capability and response speed.

[0059] The following is based on Figure 1 The apparatus provided in some embodiments of this disclosure is described as examples. The following description is intended to illustrate some implementation scenarios of the technical solutions of this disclosure more clearly. Some embodiments of this disclosure achieve deep collaboration between a clock module and a main power module through bidirectional connection, jointly ensuring the stable operation of the airbag ignition actuator. In some embodiments, such as... Figure 2 As shown, Figure 2 This is a schematic diagram illustrating the clock module processing flow in an airbag ignition actuator according to an exemplary embodiment. The specific working process may include:

[0060] S20: After the system is powered on, the main power module supplies power to the clock module according to a preset power-on sequence, and the frequency modulation control unit initializes a preset algorithm and modulation parameters;

[0061] S22: The internal resonant circuit unit starts after the power supply is stable, generates a basic clock signal, and performs frequency modulation according to the control instructions of the frequency modulation control unit. For example, in complex urban road conditions, the control frequency calibration port is changed with a random number sequence to disperse clock energy and resist broad-spectrum electromagnetic interference; when a specific frequency band interference is detected, the control center frequency point is linearly incremented by 10 kHz steps to avoid the interference frequency band.

[0062] S24: The clock monitoring unit monitors the frequency of the modulated clock signal in real time, and sends a monitoring feedback signal to the frequency modulation control unit if the frequency is detected to be out of a preset stable interval (such as 16 MHz ± 0.1 MHz).

[0063] S26: After receiving the monitoring feedback signal, the frequency modulation control unit adjusts the modulation parameters (such as reducing the bandwidth and adjusting the step size), and dynamically optimizes the frequency modulation strategy in combination with the voltage state feedback of the voltage monitoring module to ensure stable output of the clock signal.

[0064] In some embodiments, the working process of the power module can include:

[0065] In the power-on stage, after the chip main power supply is started, it is confirmed that the voltage meets the threshold value (such as ≥ 5V), triggering the boost power supply to start; after the boost power supply stably outputs a high voltage (such as 24V), its voltage ready signal triggers the system-level step-down power supply to start, reducing 24V to 6.7V. After the system-level step-down power supply is stable, the internal voltage regulator starts, and the power supply source is switched to the system-level step-down power supply by default. After the internal voltage regulator outputs stably, the reference reset unit starts to generate a power-on reset signal and two-way bandgap reference voltage. After the reference reset unit is ready, the first multiplexer selects the dedicated step-down power supply for external MCU power supply by default, and the microcontroller power supply is in standby state. Then, the actuator charging unit starts to charge and store ignition energy.

[0066] Under normal working conditions, the voltage monitoring module monitors the output voltage of each power supply in real time, and the filter configures the filtering time length, for example, 300us, to filter short-term interference. When the external MCU performs high-precision signal processing, the first multiplexer is switched to the microcontroller power supply by software control to ensure low noise demand. The precise clock signal output by the clock module provides a timing reference for actuator charging timing, power module switching delay, etc.

[0067] In the sleep mode, the internal voltage regulator is automatically switched to the system-level voltage reducer for power supply to reduce power consumption. In some embodiments of the present disclosure, if it is necessary to avoid chip sleep, the internal voltage regulator is switched to a shielding mode by software configuration to shield the input of the IO level. The frequency modulation control unit of the clock module adjusts the parameters to extend the modulation period, for example, to 500us, to reduce the power consumption of the clock module.

[0068] In the abnormal condition, when the voltage monitoring module detects overvoltage / undervoltage abnormality, the filter performs 500us digital filtering, and after confirming that the abnormality is a real fault, at least one of the following three operations can be triggered: controlling the power supply enable switch to close the abnormal power module; controlling the reset source to trigger system reset; storing abnormal information to the register; feeding back the voltage monitoring result to the clock module, and the frequency modulation control unit is switched to a random number sequence modulation mode to enhance the anti-interference ability of the clock signal.

[0069] If the main power supply of the chip fails due to the collision trigger condition, the actuator charging unit can immediately release the stored energy to supply power to the ignition actuator and the core module; the clock monitoring unit of the clock module prioritizes the stability of the clock frequency, suspends unnecessary modulation adjustment, and provides accurate timing for the ignition command trigger.

[0070] In the embodiments provided by the present disclosure, the power module and the clock module are deeply coordinated through the power supply link, the timing reference, and the feedback signal. The multi-level architecture and the multi-selector design of the power module ensure the stability and flexible adaptability of the power supply, and the multi-mode frequency modulation and closed-loop monitoring of the clock module improve the anti-interference ability of the timing signal. In some other embodiments, the voltage monitoring and digital filtering mechanism avoids false abnormality triggering, and the strict power-up sequence ensures that the system is quickly and stably ready. The mutual coordination between the modules / units can effectively resist various disturbances during vehicle driving and ensure that the airbag ignition actuator can accurately and timely perform the ignition operation under complex conditions, providing reliable protection for the driver and passengers.

[0071] In some other embodiments of the device described in the present disclosure, the modulation control processing of the internal resonant circuit unit supports multiple modulation modes, including at least one of the following:

[0072] The frequency calibration port of the internal resonant circuit unit is controlled to change with a random number sequence to disperse the clock signal energy and weaken the broadband electromagnetic interference;

[0073] The control center frequency is linearly increased or decreased according to a preset step size to more accurately avoid interference in a specific frequency band;

[0074] The period of frequency modulation (configurable from several us to several hundred us) is adapted to the anti-interference requirements and power consumption balance under different conditions;

[0075] The bandwidth of the frequency modulation can be adjusted by adjusting the preset step length. The step length can be flexibly adjusted according to the change information of the application working condition scene. When the interference is strong, the bandwidth is widened. When the interference is weak, the bandwidth is narrowed.

[0076] The above-mentioned modes can be used alone or in combination. For example, when the frequency calibration port of the internal resonant circuit unit is controlled to change with a random number sequence, the frequency modulation control unit can internally build a pseudo-random number generator to generate a random number sequence that is irregular but within a preset range. The random number sequence is converted into a voltage / logic control signal to input the frequency calibration port of the IRC, so that the clock frequency output by the IRC jumps irregularly around the center frequency point (for example, the center frequency is 16 MHz, and the jump range is 15.5 MHz-16.5 MHz).

[0077] When the center frequency point of the internal resonant circuit unit is linearly increased or decreased by a preset step length, for example, the preset step length is the minimum unit of frequency adjustment (for example, 10 kHz / step), the frequency modulation control unit outputs the control signal according to the center frequency point→center frequency point+1step→…→center frequency point+maximum step number or in the reverse direction, so that the clock frequency changes linearly (for example, 16 MHz→16.01 MHz→16.02 MHz→…→16.8 MHz, and then the cycle is completed or the direction is switched).

[0078] The modulation period length can be configured by software. The period length can be flexibly set in the range of several us to several hundred us, such as 5 us, 50 us, 500 us, etc. The period length directly determines the speed of the change of the clock frequency. The bandwidth can be achieved by adjusting the number of preset step lengths. The more the step lengths, the wider the bandwidth. For example, 80 steps correspond to a bandwidth of 0.8 MHz, and 40 steps correspond to a bandwidth of 0.4 MHz. The bandwidth range determines the maximum jump amplitude of the clock frequency.

[0079] In the embodiments of the present disclosure, the random number sequence modulation makes the clock frequency irregularly distributed, avoids that the fixed frequency point is locked by the external same-frequency electromagnetic interference, disperses the signal energy, and weakens the influence of complex interference sources such as vehicle-mounted radars and wireless communication. The linear increase and decrease modulation can specifically cover the fixed interference frequency band (for example, the interference frequency band of a certain sensor is 16.2-16.8 MHz). The clock signal is quickly swept through the interference frequency band through linear change, so as to avoid time sequence disorder caused by long-time stay, and accurately avoid specific frequency band interference. The controllability of the period and the bandwidth enables the clock module to dynamically balance the anti-interference performance and the power consumption. For example, a short period and a wide bandwidth are used for high-speed driving (interference is frequent), a long period and a narrow bandwidth are used for sleep mode (low power consumption requirement), and multiple working condition requirements are adapted. Multiple modulation modes are developed around the center frequency point to avoid unbounded frequency drift. In combination with the closed-loop control of the clock monitoring unit, the clock signal is ensured to be anti-interference and meet the system time sequence requirement, and the stability of the clock time sequence is ensured.

[0080] The preset step of frequency modulation in the embodiments of the present disclosure is a configurable parameter, and the frequency modulation control unit can adjust the step size in real time in response to application working condition scene change information. The working condition scene change information sources include monitoring results of a voltage monitoring module (such as frequent voltage fluctuation indicating strong interference), driving state signals (such as high speed / low speed, urban / highway conditions) transmitted by a vehicle CAN bus, and interference feedback signals of a clock monitoring unit (such as an increase in clock frequency deviation times), and the like. In some embodiments of the present disclosure, the step adjustment logic can be: for working conditions with high interference intensity, such as high-speed driving and intensive start of on-board electrical appliances, the step size is increased, such as from 10 kHz / step to 20 kHz / step, the frequency coverage range is quickly expanded, and the anti-interference ability is enhanced; and for working conditions with low interference intensity, such as low-speed driving and parking standby, the step size is reduced, such as from 10 kHz / step to 5 kHz / step, and the influence of frequency fluctuation on timing is reduced.

[0081] In this way, in the embodiments, without modifying hardware, the working conditions with different interference intensities can be adapted only by adjusting the step size through software, avoiding the problems of insufficient anti-interference or excessive timing fluctuation caused by a fixed step size, and improving the flexibility of anti-interference. Moreover, a relatively small step size is used when the interference is weak, the basic anti-interference ability is ensured, the frequency jump range is reduced, and the timing stability of the clock signal is improved, and a relatively large step size is used when the interference is strong, the signal energy can be quickly dispersed, the anti-interference effect is strengthened, and the timing precision optimization and anti-interference balance are achieved.

[0082] In some embodiments of the device provided by the present disclosure, the main power supply module further includes an internal voltage stabilizing power supply connected with the system-level voltage reducing power supply, and the power supply is derived from a chip main power supply or a system-level voltage reducing voltage. The plurality of candidate power supplies include: a special-level voltage reducing power supply connected with the system-level voltage reducing power supply, and a microcontroller power supply connected with the system-level voltage reducing power supply and the internal voltage stabilizing power supply, and the special-level voltage reducing power supply and the microcontroller power supply are connected with a first multiplexer. The core functions of the internal voltage stabilizing power supply include: generating a power-on reset signal to ensure that each module is started in an orderly manner from an initial state when the system is powered on, and to avoid power-on disorder; and generating a plurality of independent BANDGAP reference voltages (BANDGAP1, BANDGAP2, etc.), and a plurality of BANDGAP reference voltage sources are connected with a second multiplexer, one of which is used as a reference voltage of the voltage monitoring module to realize the accuracy and functional safety redundancy of voltage monitoring.

[0083] The internal voltage stabilizing power supply (internal LDO) is connected with the system-level voltage reducing power supply (SYS BUCK), and the power supply source can be automatically switched between the chip main power supply and the SYS BUCK through a multiplexer (MUX) hardware to adapt to the power supply demand in different working conditions such as sleep mode and power-on and power-off.

[0084] The specific configuration of the plurality of candidate power supplies can include:

[0085] The dedicated level buck power supply (VCC BUCK) is directly connected with the SYS BUCK, receives the intermediate voltage (such as 6.7V) output by the SYS BUCK, and outputs the working voltage (such as 1.8V / 3.3V) adapted to the external MCU after voltage reduction, and has high energy conversion efficiency.

[0086] The microcontroller power supply (LDO TO MCU) is connected with the SYS BUCK and the internal LDO at the same time, outputs small ripple (≤50mV) and low power supply noise, and is suitable for the MCU high-precision signal processing scene.

[0087] In some embodiments, the LDO TO EXT (external power supply) can also be included, which is connected with the SYS BUCK and used for supplying power to the peripheral circuit, sensor, external IO and the like.

[0088] The dedicated level buck power supply and the microcontroller power supply are connected with the first multiplexer (MUX1), and the MUX1 can select the optimal power supply path according to the working state (such as normal operation and high-precision calculation) of the external MCU. Through the switching of the MUX1, the dedicated level buck power supply (efficiency priority) is selected when the MCU normally operates, and the microcontroller power supply (low noise priority) is selected when the high-precision signal is processed, so as to balance the energy efficiency and the power supply stability, and realize the precise adaptation of the power supply demand. In addition, the double-path design of the candidate power supply of the double power supply paths of the internal LDO avoids the interruption of the MCU power supply caused by the failure of the single power supply module, improves the power supply redundancy, and guarantees the continuous work of the core computing components.

[0089] In another embodiment of the disclosure, the main power supply module further includes a reference reset unit connected with the internal voltage regulator, which is used for generating a power-on reset signal and generating a plurality of bandgap reference voltages, one of which is used as a reference voltage for monitoring the bandgap reference voltages of different power supplies by the voltage monitoring module, and the plurality of bandgap reference voltage sources are connected with the second multiplexer.

[0090] The internal voltage regulator is connected with the system level buck power supply, and the power supply source can be automatically switched between the chip main power supply and the system level buck power supply, and is suitable for multiple working conditions such as sleep mode and power-on / off. The power supply has a shielding mode, in which the level input of the input / output (IO) port is shielded, the chip is prohibited from entering the sleep mode, and the interruption of the ignition process caused by abnormality such as IO interference and battery power-off is prevented. In this embodiment, the reference reset unit is directly connected with the internal voltage regulator (internal LDO), and only receives the stable main power (such as analog main power 4.75V and digital main power 1.8V) output by the internal LDO, so as to ensure the stability of its own work.

[0091] The reference reset unit in the embodiment can generate a power-on reset signal (POR signal). When the power supply system is powered on, the reference reset unit detects the input voltage, and when the voltage reaches a preset threshold (such as 4.25V) and is stable for ≥100ns, the reset signal is released, ensuring that the chip and each module are started in an orderly manner from the initial state. When the power supply system is powered off or the voltage is abnormal, the reset signal is retriggered to prevent the module from working under voltage. At the same time, multiple bandgap reference voltages are generated, for example, two independent bandgap reference sources (BANDGAP1 / BANDGAP2) are generated, which are two physically isolated and consistent performance reference voltages. Both of the two reference voltage sources are connected to a second multiplexer (MUX2). One of the bandgap reference voltages is output through the MUX2 and can be used as a reference voltage for each module; the other can be used as a reference voltage for the voltage monitoring module for voltage monitoring, which can avoid common cause failure and meet functional safety requirements, and can also be used as a backup reference. When one of the reference sources fails, the MUX2 automatically switches to the backup reference.

[0092] As described above, the internal regulated power supply is configured to include a shielding mode in which the chip is prohibited from entering a sleep mode by shielding the level input of the input and output port. In this way, it can be avoided that the chip mistakenly enters the sleep mode due to abnormal situations such as interference of the IO port, power-off of the battery, etc., and it can be ensured that the ignition actuator charging unit continuously maintains a full power state and can release ignition energy in time in the event of a collision. Shielding the IO level input can also effectively resist the influence of external electromagnetic interference on the power supply control logic and prevent problems such as abnormal power supply switching and module sleep failure caused by interference signals.

[0093] In another embodiment of the device provided by the present disclosure, the power-on sequence of the main power supply module is: the chip main power supply, the boost voltage, the internal regulated voltage, the reference reset unit, the microcontroller power supply, and the ignition actuator charging unit (which can also be referred to as the ignition actuator charging module).

[0094] The embodiment can be set to power on in the order of basic power supply→core reference→load module→high-power actuator, which can prevent power voltage abnormalities caused by simultaneous start of multiple modules and avoid large current impact. For example, if the start current of the actuator charging unit is large, the last start can avoid affecting the power supply of other modules. Figure 4 is a power-on sequence timing diagram according to an exemplary embodiment. Following a strict power-on sequence can ensure that each power supply is powered on in the correct order and with a delay, ensuring that the system quickly and stably enters a ready state, avoiding problems such as module initialization failure and voltage fluctuation caused by power-on disorder, and improving the reliability of the system during the start-up phase.

[0095] It can be understood that each of the above-described apparatuses in the specification is described in a progressive manner, and the same / similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments. The related parts can be referred to the description of other method embodiments.

[0096] It should be understood that, although each step in the flowchart involved in the accompanying drawings is shown in sequence according to the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other orders. Moreover, at least part of the steps in the accompanying drawings can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or other steps or stages.

[0097] Based on the description of the above-mentioned power supply device embodiments of the airbag ignition executor, the present disclosure further provides a power supply system of the airbag ignition executor. The power supply system can include functional modules, software (application), units, components, controllers, servers, terminals, etc. using the devices described in the embodiments of the present disclosure, combined with the necessary implementation hardware. Since the implementation scheme of the power supply system solves the problem and the device is similar, the specific implementation of the power supply system in the embodiments of the present disclosure can refer to the implementation of the foregoing device, and the repeated parts will not be described again. The term "unit" or "module" described in the embodiments of the present disclosure can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, hardware, or a combination of software and hardware is also possible and is conceived.

[0098] Those skilled in the art can understand that, Figure 1 The structure shown in the above-mentioned structure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the device to which the scheme of the present application is applied. The specific device can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0099] It should be noted that the above-mentioned devices, systems, etc. according to the description of the device embodiments can also include other implementations. At the same time, the new embodiments formed by the mutual combination of the features of each device, system embodiment still belong to the implementation range covered by the present disclosure, and will not be described one by one here.

[0100] For ease of description, the above apparatus is described in various modules with functions respectively. Of course, when implementing one or more of the present specification, the functions of each module can be implemented in the same or more software and / or hardware, or the modules implementing the same function can be implemented by a combination of multiple sub-modules or sub-units, etc. The above-described apparatus embodiments are only illustrative, for example, the division of modules or units is only a logical function division, and actual implementation can have another division manner, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the coupling, communication connection, etc. between the apparatuses or units shown or described can be directly and / or indirectly coupled / connected in a manner, which can be through some standard or self-defined interface, protocol, etc., which is electrically, mechanically or other form.

[0101] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the one or more aspects of the present disclosure. It is intended that the present disclosure cover any and all variations of the one or more aspects of the present disclosure which come within the scope of the present disclosure. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the present disclosure being indicated by the substance of the specification.

[0102] It should be understood that the present disclosure is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof.

Claims

1. A power supply device for an airbag ignition actuator, characterized by comprising: The device comprises a power module and a clock module, wherein: The clock module comprises a frequency modulation control unit, an internal resonant circuit unit and a clock monitoring unit. The frequency modulation control unit is connected with the internal resonant circuit unit and the clock monitoring unit, and is configured to generate a control instruction according to a preset algorithm. The control instruction is used for modulating and controlling the internal resonant circuit unit, and is also used for adjusting the parameters of frequency modulation control based on the monitoring feedback signal fed back by the clock monitoring unit and / or the monitoring result of voltage. The internal resonant circuit unit is configured to generate a clock signal, and perform corresponding frequency modulation based on the control instruction, and output a modulated clock signal. The clock monitoring unit is connected with the internal resonant circuit unit, and is configured to monitor the received modulated clock signal, and send a monitoring feedback signal to the frequency modulation control unit when detecting that the frequency of the modulated clock signal exceeds a preset stable interval range. The power module comprises a main power module and a voltage monitoring module. The main power module comprises a boost power supply, an actuator charging unit connected with the boost power supply, a system-level step-down power supply connected with the boost power supply, a plurality of candidate power supplies connected with the system-level step-down power supply, and one or more multiplexers connected with the plurality of candidate power supplies and configured to select the candidate power supplies to output the voltage of the corresponding candidate power supply. The voltage monitoring module is connected with the voltage output end of the main power module, and is configured to feed back the monitoring result of voltage to the main power module and the clock module, so that the main power module and / or the clock module perform corresponding control processing. The clock module is connected with the power supply in the main power module, and is configured to provide a modulated clock signal for the power supply in the main power module.

2. The power supply device for an airbag ignition actuator according to claim 1, wherein The modulating and controlling of the internal resonant circuit unit comprises at least one of the following: Controlling the frequency calibration port of the internal resonant circuit unit to change with a random number sequence; Controlling the center frequency point of the internal resonant circuit unit to linearly increase or decrease by a preset step length; Controlling the period of frequency modulation; Controlling the bandwidth of frequency adjustment.

3. The power supply device for an airbag ignition actuator according to claim 2, wherein The preset step length is configured to be adjustable, and is used for adjusting the preset step length in response to the change information of the application working condition scene.

4. The power supply device for an airbag ignition actuator according to claim 1, wherein The main power module further comprises an internal voltage stabilizing power supply connected with the system-level step-down power supply, and the power supply is derived from the chip main power supply or the system-level step-down power supply. The plurality of candidate power supplies comprise a dedicated step-down power supply connected with the system-level step-down power supply and a microcontroller power supply connected with the system-level step-down power supply and the internal voltage stabilizing power supply. The dedicated step-down power supply and the microcontroller power supply are connected with a first multiplexer.

5. The power supply device for an airbag ignition actuator according to claim 4, wherein The main power module further comprises a reference reset unit connected with the internal voltage stabilizing power supply, which is configured to generate a power-on reset signal and a plurality of bandgap reference voltages. One of the bandgap reference voltages is used as a reference voltage for the voltage monitoring module to monitor the bandgap reference voltages of different power supplies. The plurality of bandgap reference voltages are connected with a second multiplexer.

6. The power supply device for an airbag ignition actuator according to claim 4, wherein The internal voltage stabilizing power supply is configured to include a shielding mode, in which a level input of an input / output port is shielded to prohibit the chip from entering a sleep mode.

7. The power supply device for an airbag ignition actuator according to claim 5, wherein The power-on sequence of the main power supply module is: a chip main power supply, a boost power supply, an internal voltage stabilizing power supply, a reference reset unit, a microcontroller power supply, and an actuator charging unit.

8. The power supply device for an airbag ignition actuator according to claim 4, wherein The power supply module further comprises a filter connected to an output end of the voltage monitoring module, a reset source, a register, and a power supply enable switch in the main power supply module, the filter is used for digitally filtering the power supply monitoring result of the voltage monitoring module, and the power supply enable switch or the reset source is controlled according to the digitally filtered result to reset the system or store the alarm information of the abnormal voltage.

9. The power supply device for an airbag ignition actuator according to claim 8, wherein The filtering duration of the filter is configured to be adjustable, and the filtering duration is adjusted in response to the change information of the application working condition scene.

10. A power supply system for an airbag ignition actuator, characterized by comprising: The power supply system comprises the power supply device according to any one of claims 1 to 9.

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