CN214958733U - Capacitor charging circuit, safety air bag controller and safety air bag system - Google Patents
Capacitor charging circuit, safety air bag controller and safety air bag system Download PDFInfo
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- CN214958733U CN214958733U CN202023335291.XU CN202023335291U CN214958733U CN 214958733 U CN214958733 U CN 214958733U CN 202023335291 U CN202023335291 U CN 202023335291U CN 214958733 U CN214958733 U CN 214958733U
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- 239000003990 capacitor Substances 0.000 title claims abstract description 74
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 description 18
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
A capacitive charging circuit for an airbag controller, comprising: a charging power supply for supplying a charging current to the capacitor; a switch module connected between the charging power supply and the charging terminal of the capacitor, wherein when the switch module is turned on, the charging power supply and the charging terminal of the capacitor are electrically conducted, and when the switch module is turned off, the charging power supply and the charging terminal of the capacitor are electrically disconnected; and a pulse width modulation signal circuit connected to the switching module and outputting a pulse width modulation signal for controlling the switching module to be intermittently turned on and off to the switching module. The capacitor charging circuit can shorten the time for charging the capacitor, can adjust the charging current charged into the capacitor, and improves the precision of the capacitor charging current. The application also provides an air bag controller and an air bag system comprising the capacitor charging circuit.
Description
Technical Field
The application relates to a capacitor charging technology, in particular to a capacitor charging circuit, an airbag controller and an airbag control system.
Background
Currently, in the design of an Air Bag controller (Air Bag Electronic Control Unit) chipset, the minimum charging current step size of a single chip is, for example, 20 milliamperes (mA), and due to current limitation, an ER (Energy storage Capacitor) charging current needs to be set to a lower current level, which reduces the charging efficiency of the ER. In order to ensure the charging requirement of ER, for example, a plurality of sets of current source circuits may be Integrated in an Application Specific Integrated Circuit (ASIC), but the adjustment range of the charging current is still limited by the current step size, and although a plurality of sets of current sources are provided, the charging time of ER cannot be effectively reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome above-mentioned weak point, solve the low problem of electric capacity charging efficiency among the prior art, the utility model discloses a following scheme realizes:
capacitor charging circuit for an airbag controller, characterized in that it comprises:
a charging power supply for supplying a charging current to the capacitor;
a switch module connected between the charging power supply and the charging terminal of the capacitor, wherein when the switch module is turned on, the charging power supply and the charging terminal of the capacitor are electrically conducted, and when the switch module is turned off, the charging power supply and the charging terminal of the capacitor are electrically disconnected; and
and the pulse width modulation signal circuit is connected with the switch module and outputs a pulse width modulation signal for controlling the switch module to be switched on and off intermittently to the switch module.
Furthermore, the switch module is a triode, the base of the triode is connected with the pulse width modulation signal circuit, the collector of the triode is connected with the charging power supply, the emitter of the triode is connected with the charging end of the capacitor, and the other end of the capacitor is grounded.
Further, at the upper edge of the pwm signal, the switch module is turned on and the charging power supply charges the capacitor; and at the lower edge of the pulse width modulation signal, the switch module is disconnected and the charging power supply is electrically disconnected from the capacitor.
Further, the charging current Icharge output by the emitter of the triode is determined by the following formula: icharge × Duty, and Duty is Ton/Tcycle, where Isource represents a charging current provided by the charging power supply; duty represents a Duty ratio of the pulse width modulation signal, Ton represents a rising edge of the pulse width modulation signal, and Tcycle represents a period of the pulse width modulation signal.
Further, the maximum current output by the charging power supply is 120 mA.
Further, the switch module is a triode.
Further, the charging power supply is a current source.
The utility model also provides an air bag controller, it has the energy storage electric capacity, a serial communication port, including as aforesaid in the air bag controller electric capacity charging circuit, electric capacity charging circuit is used for storage electric capacity charges.
The application also provides an airbag system, which comprises an airbag, a gas generator, a sensor and the airbag controller, wherein the airbag controller is electrically connected with the sensor and the gas generator respectively, and the gas generator is connected with the airbag; the sensor sends an airbag inflation instruction to the airbag controller when detecting a collision event, the airbag controller responds to the airbag inflation instruction, sends an inflation starting instruction to the gas generator and provides working voltage for the gas generator, and the gas generator responds to the inflation starting instruction and inflates the airbag.
The utility model discloses a capacitance charging circuit of scheme only sets up a single current source and charges for electric capacity, and the operating current that this single current source provided is than great, for example can provide 120 mA's operating current, so can shorten the time that charges to electric capacity greatly. In addition, by arranging the switch module and the pulse width modulation signal circuit, the size of the charging current charged into the capacitor can be adjusted, and the precision and the charging speed of the capacitor charging current are improved.
Drawings
The features, characteristics, advantages and benefits of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic diagram of a structure of a capacitor charging circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a pwm signal according to an embodiment of the present invention.
Detailed Description
The technical solution of the embodiment of the present invention is described in detail below with reference to fig. 1 and 2.
Fig. 1 is a schematic diagram of a structure of a capacitor charging circuit according to an embodiment of the present invention. The capacitive charging Circuit is used in an airbag controller and can be connected to, for example, an ASIC (Application Specific Integrated Circuit) in the airbag control. The energy storage Capacitor ER of the present embodiment may be a Multi-layer Ceramic Capacitor (MLCC). As shown in the drawings, the capacitor charging circuit provided in the embodiment of the present application includes: charging power supply, switch module, pulse width modulation signal circuit and electric capacity, wherein: and the charging power supply is used for providing charging current for the capacitor. In this embodiment, the charging power source selects a current source for providing a corresponding charging current for the capacitor, and the number of the charging power sources is only one. The switch module is arranged between the charging power supply and the capacitor and used for adjusting the size of the charging current input to the energy storage capacitor and charging the capacitor by the adjusted charging current, specifically, when the switch module is switched on, the charging ends of the charging power supply and the capacitor are electrically connected, and when the switch module is switched off, the charging ends of the charging power supply and the capacitor are electrically connected in a disconnection manner. As shown in the figure, the switch module includes a triode, wherein a base of the triode is connected with a Pulse Width Modulation (PWM) control signal, a collector of the triode is connected with a charging power supply, an emitter of the triode is connected with a charging end of a capacitor, and the other end of the capacitor is grounded. In this embodiment, the capacitor is an energy storage capacitor ER, the energy storage capacitor ER is charged by using the charging current provided by the charging power supply, and the energy storage capacitor ER is used to provide power for normal operation of other electrical components in the airbag controller when power is off.
Fig. 2 is a schematic diagram of a pwm signal according to an embodiment of the present invention. As shown, the pwm signal is a periodic signal that is used to control the charging current of the energy storage capacitor ER. At the upper edge (Ton) of the pulse width modulation signal, the triode is conducted, and the charging power supply charges the energy storage capacitor ER. At the lower edge (Toff) of the pulse width modulation signal, the triode is cut off, and the charging power supply is disconnected with the energy storage capacitor ER. In this embodiment, the current for charging the energy storage capacitor ER can be adjusted by adjusting the ratio between the upper edge of the pwm signal and the period of the pwm signal. That is, the charging current Icharge output from the emitter of the triode is determined by the following formula:
Icharge＝Isource×Duty，Duty＝Ton/Tcycle
wherein Isource represents a charging current provided by the charging power supply; duty represents a Duty ratio, Ton represents a rising edge of the pulse width modulation signal, and Tcycle represents a period of the pulse width modulation signal.
In this embodiment, the charging power source is a current source, the operating current provided by the charging power source is one of 150mA, 120mA, 100mA, 80mA, or 60mA, for example, the operating current provided by the charging power source is 120 mA.
The present embodiment provides a sufficient current to charge the energy storage capacitor through the integrated charging current source of the single energy storage capacitor ER, so that the charging efficiency of the energy storage capacitor ER is higher. Moreover, by using a single charging current source, which is equivalent to a plurality of current sources with a current step of 20mA in the prior art, after the capacitor charging circuit of the present embodiment is adopted, only one current source is needed, and only one switch module is needed, so that the capacitor charging circuit of the embodiment of the present application has a lower cost and a smaller overall volume.
In this embodiment, the charging current of the energy storage capacitor ER can be adjusted by the duty ratio of the pulse width modulation signal, and can be set and controlled by the ASIC of the airbag controller as needed, based on which the adjustment step length of the charging current of the energy storage capacitor can be increased to 1mA or even higher, thereby improving the accuracy of adjusting the charging current of the energy storage capacitor.
In this embodiment, the ASIC may be replaced by a Field Programmable Gate Array (FPGA), a Programmable Logic Device (PLD), a Complex Programmable Logic Device (CPLD), or the like.
In the embodiment, only one single current source is arranged for charging the energy storage capacitor ER, and the working current provided by the single current source is relatively large, so that the time for charging the capacitor is greatly shortened, and the current charged into the capacitor can be adjusted by arranging the charging current adjusting unit, so that the precision of the capacitor charging current is improved.
The utility model also discloses an air bag controller is provided with the electric capacity charging circuit of above-mentioned embodiment in the air bag controller.
The utility model also discloses an air bag control system, control system include air bag, gas generator, sensor and the air bag controller of aforementioned embodiment, are provided with the self-adaptation electric capacity charging circuit of aforementioned embodiment in the air bag controller, the sensor with the air bag controller electricity is connected, gas generator with the air bag is connected. The sensor detects an event and sends an airbag inflation instruction to the airbag controller, the airbag controller responds to the inflation instruction, sends an inflation starting instruction to the gas generator and provides working voltage for the gas generator, and the gas generator responds to the inflation starting instruction and inflates the airbag. The events detected by the sensors include crash events, such as one or more of an eccentric hammer type sensor, a roller type crash sensor, a roller type expansion sensor, a mercury switch type crash sensor, a piezo resistive effect type crash sensor, a piezo electric effect type crash sensor, and the like. For example, when the collision sensor detects that the value reflecting the physical quantity exceeds a certain threshold value, it is determined that a collision event has occurred.
In the embodiment of the present invention, all the functional units may be integrated into one processing unit, or each unit may be separately used as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Modifications and substitutions to the details may be made by those skilled in the art without departing from the spirit and scope of the invention. The scope of protection of the present invention is limited only by the claims.
Claims (9)
1. Capacitor charging circuit for an airbag controller, characterized in that it comprises:
a charging power supply for supplying a charging current to the capacitor;
a switch module connected between the charging power supply and the charging terminal of the capacitor, wherein when the switch module is turned on, the charging power supply and the charging terminal of the capacitor are electrically conducted, and when the switch module is turned off, the charging power supply and the charging terminal of the capacitor are electrically disconnected; and
and the pulse width modulation signal circuit is connected with the switch module and outputs a pulse width modulation signal for controlling the switch module to be switched on and off intermittently to the switch module.
2. The capacitor charging circuit according to claim 1, wherein the switch module is a transistor, a base of the transistor is connected to a pwm signal circuit, a collector of the transistor is connected to the charging power source, an emitter of the transistor is connected to the charging terminal of the capacitor, and the other terminal of the capacitor is grounded.
3. The capacitor charging circuit of claim 2, wherein at an upper edge of the pwm signal, the switch module is turned on and the charging power source charges the capacitor; and at the lower edge of the pulse width modulation signal, the switch module is disconnected and the charging power supply is electrically disconnected from the capacitor.
4. A capacitor charging circuit according to claim 3, wherein the charging current Icharge output by the emitter of the transistor is determined by the following equation:
Icharge＝Isource×Duty，Duty＝Ton/Tcycle
wherein Isource represents a charging current provided by the charging power supply; duty represents a Duty ratio of the pulse width modulation signal, Ton represents a rising edge of the pulse width modulation signal, and Tcycle represents a period of the pulse width modulation signal.
5. The capacitor charging circuit according to any one of claims 1 to 4, wherein the maximum current output by the charging power supply is 120 mA.
6. The capacitance charging circuit according to claim 5, wherein the switching module is a transistor.
7. The capacitance charging circuit of claim 6, wherein the charging power source is a current source.
8. An airbag controller having a stored energy capacitor, wherein the airbag controller includes a capacitor charging circuit according to claim 7 for charging the stored energy capacitor.
9. An airbag system characterized in that it comprises an airbag, a gas generator, a sensor and an airbag controller according to claim 8, the airbag controller being electrically connected to the sensor and the gas generator, respectively, the gas generator being connected to the airbag;
the sensor sends an airbag inflation instruction to the airbag controller when detecting a collision event, the airbag controller responds to the airbag inflation instruction, sends an inflation starting instruction to the gas generator and provides working voltage for the gas generator, and the gas generator responds to the inflation starting instruction and inflates the airbag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023335291.XU CN214958733U (en) | 2020-12-31 | 2020-12-31 | Capacitor charging circuit, safety air bag controller and safety air bag system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023335291.XU CN214958733U (en) | 2020-12-31 | 2020-12-31 | Capacitor charging circuit, safety air bag controller and safety air bag system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214958733U true CN214958733U (en) | 2021-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023335291.XU Active CN214958733U (en) | 2020-12-31 | 2020-12-31 | Capacitor charging circuit, safety air bag controller and safety air bag system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214958733U (en) |
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2020
- 2020-12-31 CN CN202023335291.XU patent/CN214958733U/en active Active
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