CN219406381U - Safety air bag ignition circuit - Google Patents
Safety air bag ignition circuit Download PDFInfo
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- CN219406381U CN219406381U CN202320236186.5U CN202320236186U CN219406381U CN 219406381 U CN219406381 U CN 219406381U CN 202320236186 U CN202320236186 U CN 202320236186U CN 219406381 U CN219406381 U CN 219406381U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The utility model relates to the technical field of electronics, in particular to an ignition circuit of an air bag. The circuit comprises a boosting device, a main controller, a pre-driving chip, a collision detection switch, a circuit switch and an ignition resistor; the input end of the boosting device is connected with a vehicle-mounted power supply, the output end of the boosting device is connected with the main controller through a first voltage reducing device, the output end of the boosting device is also connected with the input end of the pre-driving chip through a second voltage reducing device, and the output end of the boosting device is also connected with the collision detection switch; the main controller is also connected to the enabling end of the pre-driving chip, and the output end of the driving chip is also connected to the circuit switch; the collision detection switch is also connected with a circuit switch, and the circuit switch is also connected with an ignition resistor. The circuit of the embodiment of the utility model uses the booster device and the step-down device to replace an integrated energy module, and simultaneously solves the problems of ignition resistance and energy supply required by each chip; the integrated circuit chip is decomposed into a plurality of devices for connection, and each device is independent, so that the fault can be conveniently checked.
Description
Technical Field
The utility model relates to the technical field of electronics, in particular to an ignition circuit of an air bag.
Background
Currently, vehicles are typically loaded with airbags, and when the vehicle encounters a traffic accident, the internal airbag ignition circuit is able to ignite the reserved mass to generate gas, filling the airbag.
The existing safety airbag ignition circuit is mainly designed and produced by a high-integration chip, is complex in structure and low in universality, when an airbag ignition chip is in shortage, a proper chip is difficult to find for replacement, the redevelopment period is long, the production is seriously affected, and when a problem occurs in an internal module of the chip, specific problem points are difficult to check, and the problem points cannot be repaired.
Disclosure of Invention
The embodiment of the utility model provides an air bag ignition circuit, which uses a boosting device and a depressurization device to replace an integrated energy module, and simultaneously solves the problems of ignition resistance and energy supply required by each chip; the integrated circuit chip is decomposed into a plurality of devices for connection, and each device is independent, so that the fault can be conveniently checked.
In a first aspect, an embodiment of the present utility model provides an airbag ignition circuit, including:
the device comprises a boosting device, a main controller, a pre-driving chip, a collision detection switch, a circuit switch and an ignition resistor;
the input end of the boosting device is connected with a vehicle-mounted power supply, the output end of the boosting device is connected with the main controller through a first voltage reducing device, the output end of the boosting device is also connected with the input end of the pre-driving chip through a second voltage reducing device, and the output end of the boosting device is also connected with the collision detection switch;
the main controller is also connected to the enabling end of the pre-driving chip, and the output end of the driving chip is also connected to the circuit switch;
the collision detection switch is also connected with the circuit switch, and the circuit switch is also connected with the ignition resistor.
In one embodiment, the pre-drive chip comprises a first pre-drive chip and a second pre-drive chip, and the circuit switch comprises a first switch and a second switch;
the output end of the boosting device is connected to the input end of the first driving chip through the second voltage reducing device, the main controller is connected to the enabling end of the first driving chip, and the output end of the first driving chip is connected to the first switch;
the output end of the voltage boosting device is connected to the input end of the second driving chip through the second voltage reducing device, the main controller is connected to the enabling end of the second driving chip, and the output end of the second driving chip is connected to the second switch.
In one embodiment, the first switch comprises: a first high side switch and a first low side switch, the second switch comprising: a second high side switch and a second low side switch;
the output end of the first pre-drive is connected to the first high-side switch and the first low-side switch respectively, and the output end of the second pre-drive is connected to the second high-side switch and the second low-side switch respectively.
In one embodiment, the firing resistor includes: a first ignition resistor and a second ignition resistor;
one end of the first ignition resistor is connected with the first high-side switch, and the other end of the first ignition resistor is connected with the first low-side switch;
one end of the second ignition resistor is connected with the second high-side switch, and the other end of the second ignition resistor is connected with the second low-side switch.
In one embodiment, the first high-side switch is a first PMOS transistor, the first low-side switch is a first NMOS transistor, the second high-side switch is a second PMOS transistor, and the second low-side switch is a second NMOS transistor.
In one embodiment, the output end of the first pre-driving chip is connected to the gate of the first PMOS transistor, and the output end of the first pre-driving chip is also connected to the gate of the first NMOS transistor;
the output end of the second pre-driving chip is connected to the grid electrode of the second PMOS tube, and the output end of the second pre-driving chip is also connected to the grid electrode of the second NMOS tube.
In one embodiment, the circuit further comprises a storage capacitor;
the output end of the voltage boosting device is connected to the input end of the energy storage capacitor, the output end of the energy storage capacitor is connected with the main controller through the first voltage reducing device, the output end of the energy storage capacitor is also connected with the input end of the pre-driving chip through the second voltage reducing device, and the output end of the energy storage capacitor is also connected to the circuit switch through the collision detection switch.
In one embodiment, the circuit further comprises: a communication chip;
the output end of the boosting device is also connected with the communication chip through a third voltage reducing device.
In one embodiment, the circuit further comprises: a standby controller;
the main controller is connected with the standby controller.
In one embodiment, the collision detection switch is a proximity switch, and the circuit switch includes at least one MOS transistor.
In the embodiment of the utility model, an air bag ignition circuit comprises a boosting device, a main controller, a pre-driving chip, a collision detection switch, a circuit switch and an ignition resistor; the input end of the boosting device is connected with a vehicle-mounted power supply, the output end of the boosting device is connected with the main controller through a first voltage reducing device, the output end of the boosting device is also connected with the input end of the pre-driving chip through a second voltage reducing device, and the output end of the boosting device is also connected with the collision detection switch; the main controller is also connected to the enabling end of the pre-driving chip, and the output end of the driving chip is also connected to the circuit switch; the collision detection switch is also connected with a circuit switch, and the circuit switch is also connected with an ignition resistor. The circuit of the embodiment of the utility model uses the booster device and the step-down device to replace an integrated energy module, and simultaneously solves the problems of ignition resistance and energy supply required by each chip; the integrated circuit chip is decomposed into a plurality of devices for connection, and each device is independent, so that the fault can be conveniently checked.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an ignition circuit for an airbag according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of another ignition circuit for an airbag according to an embodiment of the present utility model.
Detailed Description
For a better understanding of the technical solutions of the present specification, the following detailed description of the embodiments of the present utility model refers to the accompanying drawings.
It should be understood that the described embodiments are only some, but not all, of the embodiments of the present description. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present disclosure.
The terminology used in the embodiments of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the description. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Aiming at the problems that the current air bag ignition chip is responsible for structure, has poor universality, is difficult to check when the inside is out of question, and the like, the embodiment of the utility model provides an air bag ignition circuit, which is combined by using a boosting device and a depressurization device to replace an integrated energy module, and simultaneously solves the problems of ignition resistance and energy supply required by each chip; the integrated circuit chip is decomposed into a plurality of devices for connection, and each device is independent, so that the fault can be conveniently checked.
Fig. 1 is a schematic structural diagram of an ignition circuit of an airbag according to an embodiment of the present utility model. The ignition circuit according to the embodiment of the present utility model may be deployed in a vehicle provided with an airbag, as shown in fig. 1, and may include: the vehicle-mounted power supply 101, the step-up device 102, the first step-down device 103, the main controller 104, the second step-down device 105, the pre-drive chip 106, the collision detection switch 107, the circuit switch 108, and the ignition resistor 109. The vehicle-mounted power supply 101 is connected with the input end of the boosting device 102, the output end of the boosting device 102 is connected to the main controller (Microcontroller Unit; MCU) 104 through the first voltage reducing device 103, the output end of the boosting device 102 is also connected with the input end of the pre-driving chip 106 through the second voltage reducing device 105, and the output end of the boosting device 102 is also connected with the collision switch 107; the main control 104 is also connected to the enable terminal of the pre-driver chip 106, the output terminal of the pre-driver chip 106 is also connected to the circuit switch 108, and the circuit switch 108 is also connected to the firing resistor 109.
After the vehicle starts, the vehicle-mounted power supply outputs the first voltage to the boosting device 102, and the boosting device 102 boosts the first voltage to obtain the second voltage. The step-up device 102 outputs a second voltage to the collision detection switch 107, and for the main controller and the pre-driving chip, the second voltage is too large, and a step-down device may be provided before the main controller and the pre-driving chip, respectively, to reduce the second voltage to a voltage suitable for itself. Specifically, the first voltage reducing device 103 converts the second voltage into a third voltage, and outputs the third voltage to the main controller 104, and the second voltage reducing device 105 converts the second voltage into a fourth voltage, and outputs the fourth voltage to the input terminal of the pre-driving chip 106.
When the vehicle collides, the main controller 104 may send an enable signal to the pre-driving chip 106 based on the acceleration sensor detecting that the vehicle meets the condition of collision, and the pre-driving chip 106 outputs the voltage to the circuit switch 108 after being enabled, so that the circuit switch 108 is closed. The collision detection switch 107 is closed when the vehicle collides, the second voltage output by the booster 102 flows through the collision detection switch 107 and the circuit switch 108 to the ignition resistor 109, and the ignition resistor 109 generates heat to ignite substances, thereby generating gas and ejecting the airbag.
In the embodiment of the present utility model, by providing the voltage boosting device 102, the first voltage reducing device 103 and the second voltage reducing device 105, the energy supply problems of the ignition resistor 109, the main controller 104, the pre-driving chip 106 and other various devices can be solved at the same time by only needing one voltage source of the vehicle-mounted power supply 101. Due to the design of a plurality of relatively independent loops, the functional modules can be prevented from being affected mutually, and the fault detection is convenient.
In one embodiment, an energy storage capacitor may be further disposed in the circuit, where an output end of the voltage boosting device 102 is connected to an input end of the energy storage capacitor, and an output end of the energy storage capacitor is connected to the first voltage reducing device 103, the second voltage reducing device 105, and the collision detection switch 107, respectively. The step-up device 102 outputs the second voltage to the energy storage capacitor, and the energy storage capacitor does not operate when the vehicle-mounted power supply 101 can normally operate, and the energy storage capacitor serves as a standby power supply to output the second voltage to the first step-down device 103, the second step-down device 105 and the collision detection switch 107 when the vehicle-mounted power supply cannot normally operate. By arranging the energy storage power supply, the stability of the ignition circuit of the safety airbag can be further improved.
In one embodiment, a communication chip and a third voltage reducing device may be further disposed in the circuit, where an output terminal of the voltage boosting device 102 is connected to the third voltage reducing device, and the third voltage reducing device is further connected to the communication chip. The step-up device 102 outputs the second voltage to a third step-down device, and the third step-down device outputs the second voltage to the communication chip as a voltage suitable for the communication chip. By providing a communication chip, the airbag ignition circuit can communicate with other devices, such as receiving signals from an acceleration sensor.
In one embodiment, a standby controller may be further disposed in the circuit, where the standby controller is connected to the main controller 104, and if the main controller 104 fails, the standby controller may send an enable signal instead of the main controller 104.
In one embodiment, the pre-driver chip 106 may include a first pre-driver chip and a second pre-driver chip, and the circuit switch 108 includes a first switch and a second switch. The output end of the boosting device 102 is connected to the input end of the first driving chip through the second voltage reducing device 105, the main controller 104 is connected to the enabling end of the first driving chip, and the output end of the first driving chip is connected to the first switch; the output end of the voltage boosting device 102 is connected to the input end of the second driving chip through the second voltage reducing device 105, the main controller 104 is connected to the enabling end of the second driving chip, and the output end of the second driving chip is connected to the second switch. The firing resistor 109 may include a first firing resistor and a second firing resistor, the first switch being coupled to the first firing resistor and the second switch being coupled to the second firing resistor.
In the embodiment of the utility model, when the ignition resistance is required to be increased, the driving chip and the circuit switch are correspondingly increased, so that the flexibility and the applicability of the circuit are improved.
In one embodiment, a first switch includes: a first high side switch and a first low side switch, the second switch comprising: a second high side switch and a second low side switch. The output end of the first pre-drive is connected to the first high-side switch and the first low-side switch respectively, and the output end of the second pre-drive is connected to the second high-side switch and the second low-side switch respectively. One end of the first ignition resistor is connected with the first high-side switch, and the other end of the first ignition resistor is connected with the first low-side switch; one end of the second ignition resistor is connected with the second high-side switch, and the other end of the second ignition resistor is connected with the second low-side switch. In a specific embodiment, the first high-side switch may be a first PMOS transistor, the first low-side switch may be a first NMOS transistor, the second high-side switch may be a second PMOS transistor, and the second low-side switch may be a second NMOS transistor. The output end of the first pre-driving chip is connected to the grid electrode of the first PMOS tube, and the output end of the first pre-driving chip is also connected to the grid electrode of the first NMOS tube; the output end of the second pre-driving chip is connected to the grid electrode of the second PMOS tube, and the output end of the second pre-driving chip is also connected to the grid electrode of the second NMOS tube.
Fig. 2 is a schematic structural diagram of another ignition circuit for an airbag according to an embodiment of the present utility model. As shown in fig. 2, the airbag ignition circuit may include: the vehicle-mounted power supply 201, the voltage boosting device 202, the energy storage capacitor 203, the first voltage reducing device 204, the main controller 205, the standby controller 206, the second voltage reducing device 207, the first pre-driving chip 208, the second pre-driving chip 209, the collision detection switch 210, the first PMOS tube 211, the first NMOS tube 212, the second PMOS tube 213, the second NMOS tube 214, the first ignition resistor 215 and the second ignition resistor 216. Wherein the first firing resistor 215 and the second firing resistor 216 are disposed in the airbag.
In the embodiment of the present utility model, when the vehicle is impacted, the collision detection switch 210 closes the booster device 202 to transmit the second voltage to the first PMOS transistor 211, the first NMOS transistor 212, the second PMOS transistor 213 and the second NMOS transistor 214. The main controller 205 determines that the vehicle is impacted based on the acceleration sensor, sends an enabling signal to the first pre-driving chip 208 and the second pre-driving chip 209, the first pre-driving chip 208 outputs voltage to the gates of the first PMOS tube 211 and the first NMOS tube 212, the second pre-driving chip 209 outputs voltage to the gates of the second PMOS tube 213 and the second NMOS tube 214, the MOS tube reaches a conducting condition, the first ignition resistor 215 and the second ignition resistor 216 heat up after current flows, and the inherent substances are ignited, so that gas is generated, and the airbag pops up.
In the embodiment of the utility model, the air bag ignition circuit is formed by connecting a plurality of independent devices, and if one device fails, a detection device can be flexibly arranged to detect the failure reason of the circuit; the ignition resistance can be increased or reduced according to actual requirements, and the circuit flexibility is high; by arranging the energy storage capacitor and the standby controller, the stability and the reliability of the circuit can be effectively improved; the boosting device and the step-down device are adopted, and the problem of energy supply required by the ignition resistor and other chips can be solved simultaneously only by one vehicle-mounted power supply.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present utility model in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present utility model.
In the several embodiments provided by the present utility model, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the elements is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
In addition, each functional unit in the embodiments of the present utility model may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the utility model.
Claims (10)
1. An airbag ignition circuit, comprising:
the device comprises a boosting device, a main controller, a pre-driving chip, a collision detection switch, a circuit switch and an ignition resistor;
the input end of the boosting device is connected with a vehicle-mounted power supply, the output end of the boosting device is connected with the main controller through a first voltage reducing device, the output end of the boosting device is also connected with the input end of the pre-driving chip through a second voltage reducing device, and the output end of the boosting device is also connected with the collision detection switch;
the main controller is also connected to the enabling end of the pre-driving chip, and the output end of the driving chip is also connected to the circuit switch;
the collision detection switch is also connected with the circuit switch, and the circuit switch is also connected with the ignition resistor.
2. The circuit of claim 1, wherein the circuit comprises a plurality of capacitors,
the pre-driving chip comprises a first pre-driving chip and a second pre-driving chip, and the circuit switch comprises a first switch and a second switch;
the output end of the boosting device is connected to the input end of the first pre-driving chip through the second voltage reducing device, the main controller is connected to the enabling end of the first pre-driving chip, and the output end of the first pre-driving chip is connected to the first switch;
the output end of the boosting device is connected to the input end of the second pre-driving chip through the second voltage reducing device, the main controller is connected to the enabling end of the second pre-driving chip, and the output end of the second pre-driving chip is connected to the second switch.
3. The circuit of claim 2, wherein the first switch comprises: a first high side switch and a first low side switch, the second switch comprising: a second high side switch and a second low side switch;
the output end of the first pre-drive is connected to the first high-side switch and the first low-side switch respectively, and the output end of the second pre-drive is connected to the second high-side switch and the second low-side switch respectively.
4. A circuit according to claim 3, wherein the firing resistor comprises: a first ignition resistor and a second ignition resistor;
one end of the first ignition resistor is connected with the first high-side switch, and the other end of the first ignition resistor is connected with the first low-side switch;
one end of the second ignition resistor is connected with the second high-side switch, and the other end of the second ignition resistor is connected with the second low-side switch.
5. The circuit of claim 3, wherein the first high side switch is a first PMOS transistor, the first low side switch is a first NMOS transistor, the second high side switch is a second PMOS transistor, and the second low side switch is a second NMOS transistor.
6. The circuit of claim 5, wherein the output of the first pre-drive chip is connected to the gate of the first PMOS transistor, and the output of the first pre-drive chip is further connected to the gate of the first NMOS transistor;
the output end of the second pre-driving chip is connected to the grid electrode of the second PMOS tube, and the output end of the second pre-driving chip is also connected to the grid electrode of the second NMOS tube.
7. The circuit of claim 1, wherein the circuit further comprises a storage capacitor;
the output end of the voltage boosting device is connected to the input end of the energy storage capacitor, the output end of the energy storage capacitor is connected with the main controller through the first voltage reducing device, the output end of the energy storage capacitor is also connected with the input end of the pre-driving chip through the second voltage reducing device, and the output end of the energy storage capacitor is also connected to the circuit switch through the collision detection switch.
8. The circuit of claim 1, wherein the circuit further comprises: a communication chip;
the output end of the boosting device is also connected with the communication chip through a third voltage reducing device.
9. The circuit of claim 1, wherein the circuit further comprises: a standby controller;
the main controller is connected with the standby controller.
10. The circuit of claim 1, wherein the collision detection switch is a proximity switch, the circuit switch comprising at least one MOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320236186.5U CN219406381U (en) | 2023-02-16 | 2023-02-16 | Safety air bag ignition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320236186.5U CN219406381U (en) | 2023-02-16 | 2023-02-16 | Safety air bag ignition circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219406381U true CN219406381U (en) | 2023-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320236186.5U Active CN219406381U (en) | 2023-02-16 | 2023-02-16 | Safety air bag ignition circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219406381U (en) |
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2023
- 2023-02-16 CN CN202320236186.5U patent/CN219406381U/en active Active
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