Airbag drive circuit, airbag system and safety seat

Abstract

The application discloses an airbag driving circuit, an airbag system and a safety seat, and relates to the technical field of airbags, wherein the airbag driving circuit comprises a power input end, a power output end, a capacitor series circuit, a charging control circuit and an airbag control circuit. The capacitor series circuit comprises a plurality of capacitor groups connected in series between a first end and a ground end; the first end is connected to a line between the power input end and the power output end. The charging control circuit is connected with the capacitor series circuit; the charging control circuit has a signal input end for receiving a control signal; the charging control circuit is used for controlling the plurality of capacitor groups to store energy of power input by the power input end respectively and output in series after energy storage, so that the voltage of the first end is output through the power output end after being superimposed with the voltage of the plurality of capacitor groups. The airbag driving circuit provided by the application aims to improve the use stability of the airbag.

Description

Technical Field

[0001] This application relates to the technical field of airbags, and particularly to an airbag drive circuit, an airbag system, and a child safety seat. Background Technology

[0002] Existing child safety seats include an airbag and a drive mechanism for actuating the airbag, wherein the drive mechanism includes a drive circuit and a power supply module connected to the drive circuit. However, considering that the child safety seat needs to be compatible with various vehicle models, it is difficult to achieve power supply compatibility across all models. Furthermore, considering convenience, high-capacity, high-voltage rechargeable batteries cannot be used for power supply; therefore, disposable batteries are typically used. Consequently, due to the low voltage of disposable batteries, situations may arise where the airbag cannot be actuated, resulting in low stability. Utility Model Content

[0003] The main purpose of this application is to provide an airbag drive circuit, an airbag system, and a child safety seat, which aims to improve the stability of airbag use.

[0004] To achieve the above objectives, the airbag driving circuit proposed in this application includes:

[0005] Power input terminal and power output terminal;

[0006] A capacitor series circuit includes multiple capacitor groups connected in series between a first terminal and a ground terminal; the first terminal is connected to a line between the power input terminal and the power output terminal.

[0007] A charging control circuit is connected to the capacitor series circuit. The charging control circuit has a signal input terminal for receiving control signals. The charging control circuit is used to control multiple capacitor groups to store electrical energy input to the power input terminal according to the received control signals, and output the stored energy in series so that the voltage of the first terminal is superimposed with the voltage of multiple capacitor groups and then output through the power output terminal.

[0008] An airbag control circuit, wherein the input terminal of the airbag control circuit is connected to the power output terminal, and the airbag control circuit is used to connect to the airbag deployment drive component.

[0009] In one embodiment, the plurality of capacitor banks are respectively connected to the power input terminal.

[0010] In one embodiment, the charging control circuit includes:

[0011] At least one energy storage control unit is provided between every two capacitor banks. The energy storage control unit has a first signal input terminal for receiving a first control signal. The energy storage control unit is used to control one of the two corresponding capacitor banks closest to the first terminal to store the electrical energy input to the power input terminal according to the received first control signal.

[0012] At least one superposition control unit is disposed between every two capacitor groups. The energy storage control unit has a second signal input terminal for receiving a second control signal. The energy storage control unit is used to control the connection of the line between the corresponding two capacitor groups according to the received second control signal, so that the voltages of the two capacitor groups are superimposed.

[0013] In one embodiment, each capacitor bank includes a corresponding start end and a finish end, and the finish end of the previous capacitor bank in a plurality of capacitor banks is connected to the start end of the next capacitor bank in sequence through the energy storage control unit and the superposition control unit.

[0014] The first end of the first of the plurality of capacitor groups is connected to the first terminal, and the last end of the plurality of capacitor groups is connected to the ground terminal.

[0015] In one embodiment, the superposition control unit includes a first switch transistor, which is connected in series between the tail end of the previous capacitor group and the head end of the next capacitor group, and the controlled terminal of the first switch transistor is used as the second signal input terminal.

[0016] In one embodiment, the superposition control unit further includes a pull-up unit connected between the second signal input terminal and the power input terminal.

[0017] In one embodiment, the energy storage control unit includes a second switch transistor. The first conducting terminal of the second switch transistor is connected to the line between the tail end of the previous capacitor bank and the head end of the next capacitor bank. The second conducting terminal of the second switch transistor is grounded. The controlled terminal of the second switch transistor is used for the first signal input terminal.

[0018] In one embodiment, the energy storage control unit further includes a pull-up unit connected between the first signal input terminal and the power input terminal.

[0019] In one embodiment, the charging control circuit further includes multiple current limiting units, with the input terminal of one current limiting unit connected to the power input terminal and the output terminal of the current limiting unit connected to the first signal input terminal;

[0020] And / or, the input terminal of one of the current limiting units is connected to the power input terminal, and the output terminal of the current limiting unit is connected to the second signal input terminal.

[0021] In one embodiment, the airbag driving circuit further includes a plurality of current limiting input units, which are disposed in the line between each of the capacitor banks and the power input terminal.

[0022] In one embodiment, the current-limiting input unit includes a unidirectional conduction circuit and a current-limiting circuit connected in series. The unidirectional conduction circuit is used to transmit electrical energy output from the power input terminal to the capacitor bank, and the current-limiting circuit is used to limit the current of the electrical energy.

[0023] In one embodiment, the airbag driving circuit further includes a filtering circuit, which is disposed between the power input terminal and the capacitor series circuit, and is used to filter the electrical energy input from the power input terminal to the capacitor series circuit.

[0024] In one embodiment, the capacitor bank includes a first capacitor bank and a second capacitor bank, wherein the first capacitor bank and the second capacitor bank have a head end and a tail end disposed opposite to each other.

[0025] The number of the energy storage control unit and the superimposed control unit is one; the energy storage control unit includes a second switching transistor, and the superimposed control unit includes a first switching transistor.

[0026] The first end of the first capacitor bank is connected to the first terminal, and the last end of the first capacitor bank is sequentially connected to the first conducting terminal of the second switch and the first conducting terminal of the first switch. The second conducting terminal of the second switch is grounded, and the controlled terminal of the second switch is used for the first signal input terminal. The second conducting terminal of the first switch is connected to the power input terminal and the first end of the second capacitor bank. The last end of the second capacitor bank is grounded, and the controlled terminal of the first switch is used for the second signal input terminal.

[0027] In one embodiment, the number of capacitors in the first capacitor group and the second capacitor group is one.

[0028] This application also provides an airbag system, the airbag system comprising:

[0029] airbags;

[0030] A driving device, the driving device including an airbag driving circuit as described in any of the above, the driving device being connected to the airbag driving circuit, the driving device being used to deploy the airbag.

[0031] This application also provides a safety seat, which includes the airbag system described above.

[0032] This application provides an airbag driving circuit, including a power input terminal, a power output terminal, a capacitor series circuit, a charging control circuit, and an airbag control circuit. The power input terminal is used to connect to a power source, and the power output terminal is used to output boosted power. The boosting process is achieved through the capacitor series circuit and the charging control circuit. The capacitor series circuit includes multiple capacitor groups connected in series between a first terminal and a ground terminal. The first terminal is connected to a line between the power input terminal and the power output terminal. The charging control circuit is connected to the capacitor series circuit. The charging control circuit has a signal input terminal for receiving control signals. The charging control circuit controls the multiple capacitor groups to store energy input from the power input terminal according to the received control signals, and then outputs the stored energy in series, so that the voltage at the first terminal is superimposed with the voltages of the multiple capacitor groups and output through the power output terminal. The input terminal of the airbag control circuit is connected to the power output terminal, and the airbag control circuit is used to connect to the airbag's deployment drive component.

[0033] In summary, it can be understood that after receiving the corresponding control signal, the charging control circuit can control multiple capacitor groups in the capacitor series circuit to charge. Subsequently, the charging control circuit will also control the capacitance between each capacitor group to be superimposed according to the received control signal. In this way, the voltage of the power input terminal can be increased, thereby providing sufficient electrical energy to drive the airbag and improve its stability. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0035] Figure 1 A schematic diagram of the airbag driving circuit provided in this application;

[0036] Figure 2 A circuit diagram of an embodiment of the airbag driving circuit provided in this application;

[0037] Figure 3 A circuit diagram of another embodiment of the airbag driving circuit provided in this application.

[0038] Explanation of icon numbers:

[0039] The system includes an airbag drive circuit 10, a power input terminal 110, a power output terminal 120, a first terminal 130, a capacitor series circuit 200, a charging control circuit 300, an energy storage control unit 310, a superposition control unit 320, and an airbag control circuit 400.

[0040] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0043] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0044] Modern car seats, especially child seats, incorporate protective mechanisms designed to enhance occupant safety. To ensure children's safety, a stable protective mechanism is essential. Understandably, a car seat may include one or more airbags. These airbags inflate rapidly upon impact to cushion the impact and protect passengers from injury. However, to ensure proper airbag deployment when needed, a drive unit is installed within the seat. This unit includes a drive circuit and a power supply module. The drive circuit monitors the collision and triggers airbag deployment; the power supply module provides the necessary electrical power. This power supply can be drawn from the vehicle, simplifying the internal structure of the airbag system; alternatively, it can be powered from a separate backup power source, allowing the car seat to operate independently of the vehicle's power system, increasing flexibility and convenience.

[0045] However, achieving power supply compatibility across different vehicle brands and models is a significant challenge because child safety seats need to be compatible. Directly drawing power from the vehicle results in poor usability and limited airbag applicability. Furthermore, when using a backup power source, large-capacity, high-voltage rechargeable batteries are not a viable option due to size, weight, and cost considerations. Therefore, existing child safety seats often use disposable low-voltage batteries, but this introduces new problems: low-voltage batteries may not provide enough energy to reliably activate the airbag, especially when the battery is low. This not only affects system stability but also poses a potential threat to passenger safety. Therefore, finding a solution to improve the stability of child safety seats has become an urgent issue.

[0046] To improve the stability of car seat use, such as Figure 1 and Figure 2As shown, the airbag driving circuit 10 proposed in this application includes: a power input terminal 110, a power output terminal 120, a capacitor series circuit 200, a charging control circuit 300, and an airbag control circuit 400. The capacitor series circuit 200 includes multiple capacitor groups connected in series between a first terminal 130 and a ground terminal; the first terminal 130 is connected to a line between the power input terminal 110 and the power output terminal 120. The charging control circuit 300 is connected to the capacitor series circuit 200; the charging control circuit 300 has a signal input terminal for receiving control signals, and is used to control the multiple capacitor groups to store electrical energy input to the power input terminal 110 according to the received control signals, and then output the stored energy in series, so that the voltage of the first terminal 130 is superimposed with the voltages of the multiple capacitor groups and output through the power output terminal 120. The input terminal of the airbag control circuit 400 is connected to the power output terminal 120, and the airbag control circuit 400 is used to connect to the airbag's deployment driving component.

[0047] In this embodiment, the power input terminal 110 is connected to the disposable battery built into the child safety seat, serving as the energy source for the entire circuit. The power input terminal 110 draws power from the disposable battery. Optionally, the disposable battery can be 12V to 24V, a voltage insufficient to directly enable the airbag control circuit 400 to control the deployment drive assembly. The power output terminal 120 is connected to the airbag control circuit 400, outputting the electrical energy after it has been multiplied tenfold by the airbag drive circuit. Furthermore, the power output terminal 120 utilizes a capacitor series circuit 200 and a charging control circuit 300 to achieve a voltage multiplication function, boosting the input voltage to a level sufficient to trigger airbag deployment before outputting it to the airbag control circuit 400. This not only improves the system's adaptability and reliability but also enhances the child safety seat's protective effectiveness in various situations.

[0048] In this embodiment, the capacitor series circuit 200 consists of multiple capacitor groups connected in series. These capacitor groups are located between the first terminal 130 and the ground terminal, and the first terminal 130 is directly connected to the line between the power input terminal 110 and the power output terminal 120. Each capacitor group can be considered as a small energy storage unit, storing energy from the power input terminal 110 during charging. When the charging control circuit 300 receives a start signal, each capacitor group begins charging, and after being fully charged, the charging control circuit 300 controls each capacitor group to release the stored energy from the first terminal 130 at a higher voltage. Thus, even when using a low-voltage disposable battery as the power input, the voltage value of the final output to the airbag deployment device can be significantly increased through the capacitor series connection. It is understood that when the voltage of the disposable battery is too low or the airbag deployment voltage is too high, more capacitor groups can be set to enhance the voltage boosting function; similarly, when the voltage of the disposable battery is not very low or the airbag deployment voltage is not very high, fewer capacitor groups can be set. In this way, it can be adapted to the airbag detonation voltage, simplifying the circuit structure while ensuring functionality.

[0049] It should be noted that the capacitor group in the capacitor series circuit 200 can be a single capacitor or a combination of multiple capacitors, depending on the actual application requirements.

[0050] In this embodiment, the charging control circuit 300 serves as a bridge connecting the capacitor series circuit 200 and an external control system. The charging control circuit 300 includes a signal input terminal for receiving control signals from the outside, such as emergency signals emitted when a sudden deceleration or impact is detected. Upon receiving such a control signal, the charging control circuit 300 immediately responds and initiates a rapid charging process for each capacitor group in the capacitor series circuit 200. More importantly, the charging control circuit 300 can coordinate the charging sequence and time difference between the capacitor groups, ensuring that all capacitor groups complete charging almost synchronously and are ready to quickly and efficiently transfer accumulated energy when needed. For example, in the instant of a collision, the charging control circuit 300 can complete the entire process within milliseconds, thereby ensuring that the airbags deploy in a timely manner and maximizing passenger safety.

[0051] In one feasible embodiment, the charging control circuit 300 can control the opening and closing of the path between each capacitor group, and can also manage whether each capacitor group is charging or not. When the system detects a collision signal, the signal input terminal of the charging control circuit 300 receives a control signal and responds immediately. First, it controls multiple capacitor groups to draw power through the power input terminal 110 and enter the charging state, ensuring that all capacitor groups are fully charged. Then, the charging control circuit 300 quickly switches the connection state between each capacitor group according to preset logic, from closed to open, so that these capacitor groups can form a series structure in an instant. It should be explained that, due to the characteristic that capacitor voltage cannot change abruptly, that is, the voltage across the capacitor will not change drastically in an instant, after the path between each capacitor group is opened, the stored voltage will gradually accumulate, eventually generating an output voltage at the power output terminal 120 that is much higher than the input voltage. This output voltage is sufficient to reliably trigger the airbag ignition device, ensuring that the airbag can deploy in time at the moment of collision, providing necessary protection for passengers.

[0052] It is important to note that during the voltage multiplication process, since the first end of the capacitor series circuit 200 is connected to the first terminal 130 and the last end of the capacitor series circuit 200 is grounded, the ground terminal serves as a reference terminal. For successful voltage multiplication, after multiple capacitor banks are fully charged, all capacitor banks between the first terminal 130 and the ground terminal need to be turned on to perform the voltage multiplication. The multiplied output voltage is then obtained from the first terminal 130. Optionally, each capacitor bank can be connected to a ground terminal via a switching transistor, thus eliminating the need to turn on all capacitor banks for voltage multiplication.

[0053] Understandably, each capacitor bank could also be connected to a ground terminal, and the charging control circuit 300 could control whether the connection between each capacitor bank and the ground terminal is active. When active, a circuit is formed, and the corresponding capacitor bank charges; when inactive, the capacitor bank stops charging. This allows for independent control and flexible management of the charging process for each capacitor bank, without needing to activate all capacitor banks simultaneously.

[0054] In this embodiment, the airbag control circuit 400 is the part of the entire system closest to the actuator (deployment drive component). Its input terminal is directly connected to the power output terminal 120, receiving the voltage amplified by the capacitor series circuit 200 from the charging control circuit 300. The airbag control circuit 400 sends commands to the airbag deployment drive component, causing it to activate accurately according to preset logic. Optionally, the deployment drive component can be an air pump to rapidly inflate the airbag. Furthermore, the airbag control circuit 400 can optionally possess self-diagnostic capabilities, periodically checking its own health and the communication links with other components during daily use. If any abnormality is detected, it can promptly issue warning messages to remind the user to perform maintenance. For example, if a critical node experiences poor contact or increased resistance, the airbag control circuit 400 will record the relevant data and notify the vehicle owner through the vehicle information system. Such preventative measures help to eliminate potential faults in advance, ensuring that the airbag can reliably operate at critical moments, providing optimal safety protection for vehicle occupants.

[0055] In summary, this application provides an airbag driving circuit, including a power input terminal 110, a power output terminal 120, a capacitor series circuit 200, a charging control circuit 300, and an airbag control circuit 400. The power input terminal 110 is used to connect to a power source, and the power output terminal 120 is used to output boosted power. The boosting process is achieved through the capacitor series circuit 200 and the charging control circuit 300. The capacitor series circuit 200 includes multiple capacitor groups connected in series between a first terminal 130 and a ground terminal. The first terminal 130 is connected to a line between the power input terminal 110 and the power output terminal 120. The charging control circuit 300 is connected to the capacitor series circuit 200. The charging control circuit 300 has a signal input terminal for receiving control signals. The charging control circuit 300 controls the multiple capacitor groups to store the electrical energy input to the power input terminal 110 according to the received control signals, and then outputs the stored energy in series, so that the voltage of the first terminal 130 is superimposed with the voltages of the multiple capacitor groups and output through the power output terminal 120. The input terminal of the airbag control circuit 400 is connected to the power output terminal 120. The airbag control circuit 400 is used to connect to the airbag's deployment drive assembly. Thus, after receiving a corresponding control signal, the charging control circuit 300 controls multiple capacitor groups in the capacitor series circuit 200 to charge. Subsequently, the charging control circuit 300 also controls the capacitance between each capacitor group to be superimposed according to the received control signal. This increases the voltage of the power input terminal 110, thereby providing sufficient electrical energy to drive the airbag and improve its stability.

[0056] In one embodiment, multiple capacitor banks are respectively connected to the power input terminal 110. It is understood that in this embodiment, each capacitor bank has an independent path to obtain electrical energy from the power input terminal 110. That is, the charging control circuit 300 can manage each capacitor bank individually, precisely controlling when each capacitor bank starts charging and when it stops charging. When sufficient activation energy is needed for the airbag, the charging control circuit 300 charges each capacitor bank sequentially or simultaneously according to preset logic. After charging is complete, through a control signal, the charging control circuit 300 can coordinate the connection state between the capacitor banks, opening the pathways between them, thereby superimposing the voltages stored in each capacitor bank, ultimately generating a multiplied high-voltage output at the power output terminal 120. This ensures that the entire system can stably provide the required high voltage at critical moments, thereby ensuring that the airbag can deploy promptly and accurately, protecting passenger safety.

[0057] It should be explained that, in one feasible embodiment, the power input terminal 110 of the airbag drive circuit 10 is connected to a disposable battery with a voltage of 5V. Therefore, after each capacitor bank is charged and fully charged, the potential difference between its two ends is 5V. In one example, such as... Figure 3 As shown, the capacitor series circuit 200 includes a first capacitor group C1 and a second capacitor group C2 connected to each other. Both are connected to the power input terminal 110. In the initial state, the path between the first capacitor group C1 and the second capacitor group C2 is open. When a danger signal is sensed, such as a collision, the charging control circuit 300 outputs a charging signal to control the first capacitor group C1 and the second capacitor group C2 to charge. After charging is completed, the path between the first capacitor group C1 and the second capacitor group C2 is closed, and the voltages of the two are superimposed to finally form a 10V voltage and output it.

[0058] In one embodiment, the charging control circuit 300 includes at least one energy storage control unit 310 and at least one superposition control unit 320. The energy storage control unit 310 is disposed between every two capacitor groups. The energy storage control unit 310 has a first signal input terminal G1 for receiving a first control signal. The energy storage control unit 310 is used to control one of the two corresponding capacitor groups closest to the first terminal 130 to store the electrical energy input to the power input terminal 110 according to the received first control signal. The superposition control unit 320 is disposed between every two capacitor groups. The energy storage control unit 310 has a first signal input terminal G2 for receiving a second control signal. The energy storage control unit 320 is used to control the connection between the two corresponding capacitor groups according to the received second control signal, so that the voltages of the two capacitor groups are superimposed.

[0059] In this embodiment, an energy storage control unit 310 is located between every two capacitor banks and manages the charging process of the capacitor banks. Each energy storage control unit 310 includes a first signal input terminal G1 for receiving a first control signal from an external control system. When the first control signal is received, the energy storage control unit 310 controls the capacitor bank closest to the power output terminal 120 to begin charging, causing it to absorb and store electrical energy from the power input terminal 110. Optionally, the energy storage control unit 310 includes switching elements (such as MOSFETs or transistors) that can quickly switch on / off states according to the state of the first control signal. For example, during the charging phase, if the first control signal indicates that a specific capacitor bank needs to be charged, the corresponding energy storage control unit 310 will close its internal switch, forming a complete current loop, allowing the capacitor bank to charge smoothly. This ensures that each capacitor bank can complete charging at the appropriate time and will not interfere with each other.

[0060] In this embodiment, the superposition control unit 320 is located between every two capacitor banks. It switches the connection between the capacitor banks to series connection after each capacitor bank has finished charging, thereby achieving voltage superposition. Each superposition control unit 320 has a first signal input terminal G2, which receives a second control signal. This second control signal determines whether the line between the two capacitor banks should be connected. The first control signal may be triggered after multiple capacitor banks have finished charging. Once the superposition control unit 320 receives this trigger signal, it activates its internal control logic, typically through some form of switching mechanism to connect the line. When all necessary superposition control units 320 respond to the second control signal and successfully establish a series path, the previously independently operating capacitor banks form a continuous high-voltage output channel. During this process, the superposition control unit 320 must not only ensure reliable connection between each capacitor bank but also ensure that the entire conversion process is rapid and smooth, so as to provide the required high-voltage pulse to the airbag in a timely manner. Furthermore, to prevent overvoltage or other abnormal situations, the superposition control unit 320 can also integrate protection circuits, such as current limiters or voltage regulators, to further improve the stability and safety of the system.

[0061] Understandably, before or before a collision signal is detected, each energy storage control unit 310 sequentially or simultaneously controls designated capacitor groups to charge according to the first control signal until the voltage between each capacitor group reaches a predetermined charge level. Next, when the system confirms an emergency and prepares to trigger the airbag, the superposition control unit 320 quickly acts according to the second control signal, connecting the previously fully charged capacitor groups in series one by one. Due to the non-sudden change in capacitor voltage, once all relevant lines are correctly connected, the voltage stored in each capacitor group is instantly superimposed, ultimately generating a voltage at the power output terminal 120 that is higher than the input voltage at the power input terminal 110. In summary, through the precise charging management of the energy storage control unit 310 and the efficient line switching capability of the superposition control unit 320, the two work closely together to ensure that even when using a low-voltage disposable battery as the power input, sufficient activation energy can be provided for the airbag, ensuring passenger safety. This achieves an effective conversion from low voltage to high voltage, solving the voltage deficiency problem in traditional disposable battery power supply solutions and providing technical support for the safety performance of child safety seats.

[0062] It should be noted that since this airbag drive circuit 10 utilizes the principle that capacitor voltage cannot change abruptly, the superimposed energy storage unit cannot continuously control the conduction between each capacitor group. Instead, it must be turned on only after each capacitor group is fully charged. Only in this way can the voltage multiplication principle be utilized.

[0063] In one embodiment, each capacitor bank includes a corresponding start end and a finish end. The finish end of the previous capacitor bank in the plurality of capacitor banks is connected to the start end of the next capacitor bank in sequence through the energy storage control unit 310 and the superposition control unit 320. The start end of the first capacitor bank in the plurality of capacitor banks is connected to the first end 130, and the finish end of the last capacitor bank in the plurality of capacitor banks is connected to the ground end.

[0064] In this embodiment, the superposition control unit 320 includes a first switch Q1, which is connected in series between the tail end of the previous capacitor group and the head end of the next capacitor group. The controlled terminal of the first switch Q1 is used for the first signal input terminal G2.

[0065] Understandably, the superposition control unit 320 includes a first switch Q1, which is connected in series between the tail end of the previous capacitor bank and the head end of the next capacitor bank. The controlled terminal of the first switch Q1 serves as the first signal input terminal G2, receiving a second control signal from an external control system. When a corresponding trigger signal is received, the first switch Q1 turns on, connecting the lines between two adjacent capacitor banks to form a series structure. After being connected in series, the previously stored charge is shared among all capacitor banks, ultimately generating a multiplied high-voltage output at the power output terminal 120.

[0066] In this embodiment, the energy storage control unit 310 includes a second switch Q2. The first conducting terminal of the second switch Q2 is connected to the line between the tail end of the previous capacitor bank and the head end of the next capacitor bank. The second conducting terminal of the second switch Q2 is grounded. The controlled terminal of the first switch Q1 is used for the first signal input terminal G1.

[0067] Understandably, the energy storage control unit 310 includes a second switch Q2, whose first conducting terminal is connected to the line between the tail end of the previous capacitor bank and the head end of the next capacitor bank, while its second conducting terminal is grounded. The controlled terminal of the second switch Q2 serves as the first signal input terminal G1, used to receive a first control signal. When the system detects that a capacitor bank needs to be charged, the corresponding second switch Q2 of the energy storage control unit 310 will close its internal switch according to the first control signal, forming a complete current loop, allowing the designated capacitor bank to begin charging.

[0068] Optionally, the first switch Q1 and the second switch Q2 can be one of a metal-oxide-semiconductor field-effect transistor, a bipolar transistor, an insulated-gate bipolar transistor, etc.

[0069] It is understandable that when there are multiple first switch transistors Q1 and second switch transistors Q2, each first switch transistor Q1 is connected to the same second signal input terminal G2, and each second switch transistor Q2 is connected to the same first signal input terminal G1 (e.g., Figure 2 and Figure 3 (As shown). In another example, when there are multiple first switches Q1 and second switches Q2, each first switch Q1 is connected to a different second signal input terminal G2, and each second switch Q2 is connected to a different first signal input terminal G1 (not shown in the figure), so as to control each first switch Q1 and each second switch Q2 individually.

[0070] It is worth noting that, since each capacitor bank is connected to the power input terminal 110, optionally, the first end of each capacitor bank is connected to the power input terminal 110 to draw power from it. However, based on this, the tail end of the previous capacitor bank in the plurality of capacitor banks needs to be connected to the first end of the next capacitor bank sequentially through the energy storage control unit 310 (second switch Q2) and the superposition control unit 320 (first switch Q1). When the second switch Q2 is turned on, the capacitor bank whose tail end is connected to the second diode is charged. Further, based on this circuit, the entire control logic is as follows: when a collision occurs, the controlled terminal of the second switch Q2 receives a first control signal, and the second switch Q2 is turned on. Thus, the electrical energy in the power input terminal 110 is transferred to the capacitor bank whose first end is connected to the power input terminal 110. This capacitor bank is grounded through the second switch Q2 connected to its tail end, forming the entire charging circuit, and the corresponding capacitor bank begins charging. After charging is complete, the second switch Q2 is turned off, disconnecting the charging circuit and preventing the capacitor bank from continuing to discharge. Subsequently, when all capacitor banks have completed charging and are ready for voltage superposition, the controlled terminal of the first switch Q1 receives the second control signal, and the first switch Q1 turns on. This opens the circuit between each capacitor bank, forming a series connection between adjacent capacitor banks, allowing the voltages stored in each capacitor bank to be superimposed. Finally, a high-voltage pulse significantly higher than the input voltage is generated at the power output terminal 120 to trigger the airbag deployment. This not only ensures sufficient activation energy for the airbag even when using a low-voltage disposable battery as the power input, but also improves the system's reliability and efficiency. It should be noted that the last capacitor in each capacitor bank is directly grounded, thus a loop exists, eliminating the need for charging control circuit 300 for charging control; only superposition control is required.

[0071] It should be explained that, for ease of understanding, a feasible implementation method is provided for illustration. For example... Figure 3As shown, the capacitor series circuit 200 includes a first capacitor group C1 and a second capacitor group C2. The first capacitor group C1 is connected to the power input terminal 110 and the power output terminal 120 (i.e., the first terminal 130). The last terminal of the first capacitor group C1 passes through the energy storage control unit 310, the superposition control unit 320, the power input terminal 110, and the first terminal of the second capacitor group C2 in sequence. The last terminal of the second capacitor group C2 is grounded. Thus, when the system is in a charging state, the energy storage control unit 310 controls the second switch Q2 to turn on according to the first control signal. Since the other conducting terminal of the second switch Q2 is grounded, it is equivalent to one end of the first capacitor group C1 being connected to the power input terminal 110 and the other end being grounded, forming a complete circuit for charging. At the same time, the first terminal of the second capacitor group C2 is connected to the power input terminal 110, and the last terminal of the second capacitor group C2 is grounded, indicating a constant charging state. After a certain period of time, when the first capacitor group C1 and the second capacitor group C2 are fully charged, the second switch Q2 is turned off, the first switch Q1 is turned on, the first capacitor group C1 and the second capacitor group C2 are connected, the voltages are superimposed, and output from the first terminal 130.

[0072] It is worth noting that in the above embodiments, the tail end of the previous capacitor group in the plurality of capacitor groups is sequentially connected to the head end of the next capacitor group through the energy storage control unit 310 and the superposition control unit 320. This connection order is a mandatory condition. Failure to follow this order may lead to problems such as charging failure, incorrect voltage superposition, or circuit failure, thereby affecting the performance and safety of the system. It is understood that this connection order is based on the position of the first end 130 or the end of each capacitor group connected to the power input end 110. The superposition control unit 320 cannot be located between the power input end 110 and the energy storage control unit 310. The power input end 110, the capacitor group, and the energy storage control unit 310 can be regarded as an energy storage unit. Each energy storage unit is connected through a superposition control unit 320, and the last one in the plurality of capacitor groups is directly grounded. Therefore, the energy storage unit formed by this capacitor group does not need to include the energy storage control unit 310. This ensures the rationality of the circuit logic control.

[0073] Optionally, the superposition control unit 320 further includes a pull-up unit connected between the first signal input terminal G2 and the power input terminal 110. The energy storage control unit 310 also includes a pull-up unit connected between the first signal input terminal G1 and the power input terminal 110. It is understood that both the superposition control unit 320 and the energy storage control unit 310 further include a pull-up unit, connected between the first signal input terminal G2 and the power input terminal 110 (for the superposition control unit 320) and between the first signal input terminal G1 and the power input terminal 110 (for the energy storage control unit 310), respectively. The main function of the pull-up unit is to ensure that when the control signal is not activated, the controlled terminal of the corresponding switching transistor (such as a MOSFET or a transistor) can maintain a high level, thus keeping the switch in the off state by default. This helps prevent accidental conduction without a clear control signal, improving the stability and reliability of the system. Subsequently, once the corresponding control signal is received, the function of the pull-up unit will be overridden, allowing the switching transistor to be turned on or off as needed, thereby realizing charging management and voltage superposition control.

[0074] Among them, such as Figure 2 or Figure 3 As shown, the pull-up unit can be the first resistor R1, that is, both the superimposed control unit 320 and the energy storage control unit 310 are connected to the power input terminal 110 through a first resistor R1.

[0075] In one embodiment, the charging control circuit 300 further includes multiple current limiting units. The input terminal of one current limiting unit is connected to the power input terminal 110, and the output terminal of the current limiting unit is connected to the first signal input terminal G1; and / or, the input terminal of one current limiting unit is connected to the power input terminal 110, and the output terminal of the current limiting unit is connected to the first signal input terminal G2. It is understood that for the current limiting unit connected to the first signal input terminal G1, during the process of the energy storage control unit 310 receiving the first control signal, the current flowing from the power input terminal 110 to the controlled terminal of the second switching transistor Q2 in the energy storage control unit 310 is limited, preventing overheating or damage to the switching transistor or other related components due to excessive current. Similarly, the current limiting unit connected to the first signal input terminal G2 provides protection when the superimposed control unit 320 receives the second control signal, ensuring the safe operation of the first switching transistor Q1. Thus, the current limiting unit not only improves the reliability and durability of the entire system but also enhances the resistance to transient current spikes, especially in high current situations that may occur during startup or switching states. Optionally, the current limiting unit can be a second resistor R2.

[0076] In one embodiment, the airbag driving circuit 10 further includes a plurality of current limiting input units, which are disposed in the line between each of the capacitor banks and the power input terminal 110.

[0077] In this embodiment, the current-limiting input unit includes a unidirectional conduction circuit and a current-limiting circuit connected in series. The unidirectional conduction circuit is used to transmit the electrical energy output from the power input terminal 110 to the capacitor bank, and the current-limiting circuit is used to limit the current of the electrical energy.

[0078] Understandably, each current-limiting input unit consists of a unidirectional conduction circuit and a current-limiting circuit connected in series, designed to ensure the safety and stability of power transmission. Specifically, the unidirectional conduction circuit is responsible for unidirectionally transmitting the power output from the power input terminal 110 to the corresponding capacitor bank, preventing reverse current flow and thus protecting the circuit from potential damage. Simultaneously, the current-limiting circuit limits the transmitted power, ensuring that the current flowing into each capacitor bank does not exceed a set safety threshold, preventing component damage or performance degradation due to overcurrent. The unidirectional conduction circuit (e.g., diode D1) ensures that current can only flow from the power input terminal 110 to the capacitor bank, without reverse current flow, effectively preventing the battery or other power components from being affected by reverse voltage. The current-limiting circuit (e.g., the third resistor R3) further ensures that even under transient high current conditions, the current flowing into the capacitor bank remains within a safe range. This enhances the system's stability and durability under various operating conditions, ensuring that the airbag can deploy rapidly in critical moments, providing necessary protection for passengers.

[0079] In one embodiment, the airbag driving circuit 10 further includes a filtering circuit located between the power input terminal 110 and the capacitor series circuit 200. This filtering circuit filters the electrical energy input from the power input terminal 110 to the capacitor series circuit 200. The main function of the filtering circuit is to eliminate noise, ripple, and other unstable factors in the input electrical energy, ensuring that the voltage and current supplied to the capacitor bank are as pure and smooth as possible. This not only helps improve the efficiency of the charging process but also prevents damage to the capacitor bank and other sensitive electronic components due to voltage fluctuations or high-frequency interference. Optionally, the filtering circuit can be composed of one or more components such as inductors, capacitors, and resistors, which work together to attenuate or remove unwanted frequency components. In this embodiment, the filtering circuit is capacitor C3, which can be used to smooth ripple in the DC voltage.

[0080] In one embodiment, such as Figure 3As shown, the capacitor bank includes a first capacitor bank C1 and a second capacitor bank C2, with the first capacitor bank C1 and the second capacitor bank C2 having oppositely arranged start and end points; the number of the energy storage control unit 310 and the superposition control unit 320 is one each; the energy storage control unit 310 includes a second switch Q2, and the superposition control unit 320 includes a first switch Q1; the start point of the first capacitor bank C1 is connected to the first terminal 130, the end point of the first capacitor bank C1 is sequentially connected to the first conducting terminal of the second switch Q2 and the first conducting terminal of the first switch Q1, the second conducting terminal of the second switch Q2 is grounded, and the controlled terminal of the second switch Q2 is used for the first signal input terminal G1; the second conducting terminal of the first switch Q1 is connected to the power input terminal 110 and the start point of the second capacitor bank C2, the end point of the second capacitor bank C2 is grounded, and the controlled terminal of the first switch Q1 is used for the first signal input terminal G2.

[0081] Understandably, the first end of the first capacitor bank C1 is connected to the power input terminal 110 and the power output terminal 120 (i.e., the first terminal 130). The last end of the first capacitor bank C1 passes sequentially through the energy storage control unit 310, the superposition control unit 320, the power input terminal 110, and the first end of the second capacitor bank C2. The last end of the second capacitor bank C2 is grounded. Thus, when the system is in a charging state, the energy storage control unit 310 controls the second switch Q2 to conduct according to the first control signal. Since the other conducting terminal of the second switch Q2 is grounded, it is equivalent to one end of the first capacitor bank C1 being connected to the power input terminal 110 and the other end being grounded, forming a complete circuit for charging. At the same time, the first end of the second capacitor bank C2 is connected to the power input terminal 110, and the last end of the second capacitor bank C2 is grounded, indicating a constant charging state. After a certain period of time, when the first capacitor group C1 and the second capacitor group C2 are fully charged, the second switch Q2 is turned off, the first switch Q1 is turned on, the first capacitor group C1 and the second capacitor group C2 are connected, the voltages are superimposed, and output from the first terminal 130.

[0082] In this embodiment, the first capacitor group C1 and the second capacitor group C2 each contain only one capacitor. That is, each capacitor group is not composed of multiple capacitors connected in parallel or series, but rather a single capacitor achieves the required energy storage function. This design simplifies the circuit structure, reduces the number of components, thereby reducing costs and potential points of failure.

[0083] This application also provides an airbag system, which includes an airbag and a driving device, wherein the driving device includes an airbag driving circuit 10 as described in any of the above embodiments. It should be noted that the specific circuit structure of the airbag driving circuit 10 refers to the above embodiments. Since this airbag system adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above embodiments.

[0084] In this embodiment, the driving device is connected to the airbag drive, and the driving device is used to deploy the airbag.

[0085] Understandably, by integrating the aforementioned airbag drive circuit 10, the airbag system can significantly improve its stability and response speed. Because the airbag drive circuit 10 employs a capacitor series circuit 200, an energy storage control unit 310, and a superimposed control unit 320, it ensures sufficient activation energy for the airbag even when using a low-voltage disposable battery as the power input. This not only solves the voltage deficiency problem inherent in traditional disposable battery power supply solutions, improving the stability of the airbag's operation, but also allows it to be adapted to various vehicle models without relying on the vehicle's own high-voltage power supply system, enhancing the system's adaptability and flexibility.

[0086] This application also provides a safety seat, which includes the airbag system described above. It should be noted that the specific structure of this airbag system refers to the above embodiments. Since this safety seat adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above embodiments.

[0087] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. An airbag driving circuit, characterized in that, The airbag driving circuit includes: Power input terminal and power output terminal; A capacitor series circuit includes multiple capacitor groups connected in series between a first terminal and a ground terminal; the first terminal is connected to a line between the power input terminal and the power output terminal. A charging control circuit is connected to the capacitor series circuit. The charging control circuit has a signal input terminal for receiving control signals. The charging control circuit is used to control multiple capacitor groups to store electrical energy input to the power input terminal according to the received control signals, and output the stored energy in series so that the voltage of the first terminal is superimposed with the voltage of multiple capacitor groups and then output through the power output terminal. An airbag control circuit, wherein the input terminal of the airbag control circuit is connected to the power output terminal, and the airbag control circuit is used to connect to the airbag deployment drive component.

2. The airbag driving circuit as described in claim 1, characterized in that, The multiple capacitor banks are respectively connected to the power input terminal.

3. The airbag driving circuit as described in claim 2, characterized in that, The charging control circuit includes: At least one energy storage control unit is provided between every two capacitor banks. The energy storage control unit has a first signal input terminal for receiving a first control signal. The energy storage control unit is used to control one of the two corresponding capacitor banks closest to the first terminal to store the electrical energy input to the power input terminal according to the received first control signal. At least one superposition control unit is disposed between every two capacitor groups. The energy storage control unit has a second signal input terminal for receiving a second control signal. The energy storage control unit is used to control the connection of the line between the corresponding two capacitor groups according to the received second control signal, so that the voltages of the two capacitor groups are superimposed.

4. The airbag driving circuit as described in claim 3, characterized in that, Each capacitor bank includes a corresponding start end and a finish end. The finish end of the previous capacitor bank in a plurality of capacitor banks is connected to the start end of the next capacitor bank in sequence through the energy storage control unit and the superposition control unit. The first end of the first of the plurality of capacitor groups is connected to the first terminal, and the last end of the plurality of capacitor groups is connected to the ground terminal.

5. The airbag driving circuit as described in claim 4, characterized in that, The superposition control unit includes a first switching transistor, which is connected in series between the tail end of the previous capacitor group and the head end of the next capacitor group. The controlled terminal of the first switching transistor is used as the second signal input terminal.

6. The airbag driving circuit as described in claim 5, characterized in that, The superposition control unit further includes a pull-up unit, which is connected between the second signal input terminal and the power input terminal.

7. The airbag driving circuit as described in claim 4, characterized in that, The energy storage control unit includes a second switch transistor. The first conducting terminal of the second switch transistor is connected to the line between the tail end of the previous capacitor bank and the head end of the next capacitor bank. The second conducting terminal of the second switch transistor is grounded. The controlled terminal of the second switch transistor is used for the first signal input terminal.

8. The airbag driving circuit as described in claim 7, characterized in that, The energy storage control unit further includes a pull-up unit, which is connected between the first signal input terminal and the power input terminal.

9. The airbag driving circuit as described in claim 3, characterized in that, The charging control circuit also includes multiple current limiting units, with the input terminal of one current limiting unit connected to the power input terminal and the output terminal of the current limiting unit connected to the first signal input terminal. And / or, the input terminal of one of the current limiting units is connected to the power input terminal, and the output terminal of the current limiting unit is connected to the second signal input terminal.

10. The airbag driving circuit as described in claim 2, characterized in that, The airbag driving circuit also includes multiple current limiting input units, which are located in the line between each capacitor bank and the power input terminal.

11. The airbag driving circuit as described in claim 10, characterized in that, The current-limiting input unit includes a unidirectional conduction circuit and a current-limiting circuit connected in series. The unidirectional conduction circuit is used to transmit the electrical energy output from the power input terminal to the capacitor bank, and the current-limiting circuit is used to limit the current of the electrical energy.

12. The airbag driving circuit as described in claim 1, characterized in that, The airbag driving circuit also includes a filtering circuit, which is located between the power input terminal and the capacitor series circuit, and is used to filter the electrical energy input from the power input terminal to the capacitor series circuit.

13. The airbag driving circuit as described in claim 3, characterized in that, The capacitor bank includes a first capacitor bank and a second capacitor bank, wherein the first capacitor bank and the second capacitor bank have a head end and a tail end that are disposed opposite to each other. The number of the energy storage control unit and the superimposed control unit is one; the energy storage control unit includes a second switching transistor, and the superimposed control unit includes a first switching transistor. The first end of the first capacitor bank is connected to the first terminal, and the last end of the first capacitor bank is sequentially connected to the first conducting terminal of the second switch and the first conducting terminal of the first switch. The second conducting terminal of the second switch is grounded, and the controlled terminal of the second switch is used for the first signal input terminal. The second conducting terminal of the first switch is connected to the power input terminal and the first end of the second capacitor bank. The last end of the second capacitor bank is grounded, and the controlled terminal of the first switch is used for the second signal input terminal.

14. The airbag driving circuit as described in claim 13, characterized in that, The number of capacitors in the first capacitor group and the second capacitor group is one.

15. An airbag system, characterized in that, The airbag system includes: airbags; A driving device, the driving device including an airbag driving circuit as described in any one of claims 1 to 14, the driving device being connected to the airbag driving circuit, the driving device being used to deploy the airbag.

16. A child safety seat, characterized in that, The safety seat includes the airbag system as described in claim 15.

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