KR20210092075A - Electronic ignition system and controlling method thereof - Google Patents

Abstract

An embodiment relates to an electronic ignition system and a control method thereof, and the electronic ignition system according to an embodiment may prevent accidental ignition of a squib element and check the state of the squib before ignition. According to the present invention, the electronic ignition system comprises: an ignition power deceleration circuit for delaying the rise time of the ignition power supplied to an ignition device; a loading check circuit for checking whether the ignition power decelerated by the ignition power deceleration circuit is loaded; an ignition current output circuit for supplying the loaded power decelerated by the ignition power deceleration circuit to the squib; a squib check current control circuit for providing a check current to the squib for checking the squib; and a squib state detection circuit for detecting whether the check current flows through the squib.

Description

Electronic ignition system and controlling method thereof

Embodiments relate to an electronic ignition system and a control method thereof, and more particularly, to an electronic ignition system capable of checking ignition power loading and squib state, and a control method thereof.

A conventional ignition device using a field effect transistor (FET) is momentarily turned on due to parasitic capacitance that inevitably exists due to a structural problem of the field effect transistor when the power supply ramp rate of the input voltage is too high. (turn-on) phenomenon occurs. In this case, an unexpected current may be supplied to the squib, which may accidentally ignite the squib.

In addition, in order to check whether the squib is normal before the test in the conventional ignition device, the inspector must directly measure the resistance of the squib mounted on the test body using a squib meter. If the test object, equipped with a propellant and warhead, is an explosive, it is very dangerous to approach the test object and perform this operation. In addition, this method cannot confirm the squib state when the test object is moving or whether the squib is actually ignited after the squib ignition signal is applied.

[Prior art literature number]

Prior art 1: Korean Patent No. 10-0780808

Prior art 2: Korean Patent Publication No. 2003-0050018

Embodiments provide an electronic ignition system capable of preventing accidental ignition of a squib element and checking a state of a squib before ignition, and a control method thereof.

In an electronic ignition system according to an embodiment for achieving the above technical problem, an ignition power deceleration circuit for delaying a rise time of the ignition power supplied to the ignition device; a loading check circuit for checking whether the ignition power decelerated by the ignition power deceleration circuit is loaded; an ignition current output circuit for supplying the charging power decelerated by the ignition power deceleration circuit to the squib; a squib check current control circuit providing a check current to the squib for checking the squib; and a squib state detection circuit for detecting whether the check current flows through the squib.

The ignition power deceleration circuit includes a first transistor, a first capacitor and a first resistor connected between an input source electrode of the first transistor and a ground, and a first resistor connected between an output drain electrode of the first transistor and the ground. It is characterized in that it includes two capacitors.

The first transistor is a P-channel FET.

The charge confirmation circuit is configured to check whether the decelerated ignition power is applied to the charge confirmation circuit through the input source electrode of the second transistor when a charge signal is applied to the gate electrode of the second transistor, and the second transistor It is characterized in that the decelerated charging power is applied to the ignition current output circuit through the output drain electrode of the.

The loading confirmation circuit may include: second and third resistors connected in parallel for dividing the ignition power; fourth and fifth resistors connected in parallel to divide the charging power; a third transistor turned on according to the divided charging voltage of the charging power; a first photocoupler connected to the fourth resistor and the input electrode of the third transistor and including a first photodiode and a fourth transistor; and a first output unit for outputting the loading confirmation signal according to a first output signal from the first photocoupler.

In the charging check circuit, when the divided charging voltage of the charging power is applied to the gate electrode of the third transistor, the divided ignition voltage of the ignition power is applied to the first photocoupler to generate the loading confirmation signal. It is characterized by outputting.

The squib check current control circuit includes: a fifth transistor turned on when a squib status check signal is applied; a second photocoupler turned on when the fifth transistor is turned on and a predetermined voltage is applied; and a squib check resistor configured to apply a squib status check power when the second photocoupler is turned on to allow a current less than or equal to a predetermined threshold value to flow through the squib.

The ignition current output circuit may include: a high-side switch turned on according to a high-side ignition signal and connected to one electrode of the squib; and a low-side switch turned on according to a low-side ignition signal and connected to the other electrode of the squib, and when both the high-side switch and the low-side switch are turned on, the decelerated charging power is applied to the squib characterized in that

The squib state detection circuit may include: a squib state check resistor connected to another electrode of the squib; a third photocoupler connected to the squib state checking resistor; and a third output unit for outputting a squib state signal according to a third output signal from the third photocoupler.

In a method for controlling an electronic ignition system according to another embodiment for achieving the above technical problem, the method comprising: delaying a rise time of an ignition power supplied to an ignition device; checking whether the decelerated ignition power source is loaded; supplying the decelerated charging power to a squib; providing a check current to the squib for checking the squib; and detecting whether the check current flows through the squib.

In a control method of an electronic ignition system according to another embodiment for achieving the above technical problem, the method comprising: applying a squib state confirmation signal; applying a loading signal when the squib status signal is normal; driving the ignition power deceleration circuit; providing charging power; when the loading confirmation signal is normally output, applying an ignition signal; applying the squib status check signal; and checking the squib state signal.

and a recording medium recording a program for executing the control method of the electronic ignition system in a computer for achieving the above technical problem.

In the electronic ignition system according to the embodiment, the ignition power deceleration circuit may prevent a phenomenon in which the squib may be accidentally ignited due to parasitic capacitance that is inevitably present due to a structural problem of the field effect transistor.

In addition, the loading confirmation circuit allows the user to check the circuit status of the ignition power loading part and the loading status of the ignition power before or during operation of the device. Instead of using a complicated measurement circuit such as an A/D converter, a photocoupler is used. This makes it possible to miniaturize and reduce the cost of the system.

In addition, the squib state measurement unit can check the squib state and the connection state of the connector and wiring that connect the squib, and the circuit is simplified by using a photo coupler, and by separating the ground of the ignition power and the digital power, During the inspection, the ignition power and digital power source interfere with each other to prevent malfunction and prevent accidental ignition of the squib by designing so that a large current cannot flow through the squib status measurement unit even when the ignition current output circuit malfunctions.

1 is a schematic diagram of an electronic ignition system 100 according to an embodiment.
2 is a flowchart for explaining a control method of an electronic ignition system according to another embodiment.
3 is a detailed circuit diagram of the ignition power loading unit 110 shown in FIG.
4 is a detailed circuit diagram of the ignition current output circuit 120 and the squib state measuring unit 140 shown in FIG. 1 .

Terms used in the present embodiments are selected as currently widely used general terms as possible while considering the functions in the present embodiments, but these may vary depending on the intention or precedent of a person skilled in the art, the emergence of new technology, etc. . In addition, there are also arbitrarily selected terms in a specific case, and in this case, the meaning will be described in detail in the description of the embodiment. Therefore, the terms used in the present embodiments should be defined based on the meaning of the term and the overall contents of the present embodiments, rather than the simple name of the term.

In the description of the embodiments, when it is said that a part is connected to another part, this includes not only a case in which it is directly connected, but also a case in which it is electrically connected with another component in the middle. In addition, when a part includes a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise stated. In addition, the term “…unit” described in the embodiments refers to a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software.

Terms such as “consisting” or “comprising” used in the present embodiments should not be construed as necessarily including all of the various components or various steps described in the specification, and some components or some of them It should be construed that steps may not be included, or may further include additional components or steps.

The description of the following embodiments should not be construed as limiting the scope of rights, and what can be easily inferred by those skilled in the art should be construed as belonging to the scope of the embodiments. Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings.

The electronic ignition system according to the embodiment may delay the rise time of the voltage supplied to the ignition device to prevent the unexpected turn-on of the field effect transistor due to the parasitic capacitance. In addition, in the operation procedure before operation, it is possible to automatically check whether the ignition power loading circuit is normal and whether the squib is normal, and the state during operation and after ignition of the squib can also be checked.

1 is a schematic diagram of an electronic ignition system 100 according to an embodiment.

Referring to FIG. 1 , the electronic ignition system 100 includes an ignition power loading unit 110 , an ignition current output circuit 120 , a squib 130 , and a squib state measurement unit 140 . Here, the number of squibs 130 may be plural, and for igniting the plurality of squibs and measuring the state, a plurality of ignition current output circuits connected to each squib and a plurality of squib state measuring units may be included. .

The ignition power loading unit 110 may receive ignition power and output a loading confirmation signal according to the loading signal. Then, the charging power is applied to the ignition current output circuit 120 . In an embodiment, the ignition power loading unit 110 includes a circuit for preventing a phenomenon in which the field effect transistor is momentarily short-circuited by parasitic capacitance and a circuit for controlling the ignition power to be loaded in the ignition device only when necessary.

The ignition current output circuit 120 ignites the squib by applying an ignition current to the squib according to the ignition signal.

The squib state measurement unit 140 flows the squib inspection current to the squib to sense the squib state and outputs a squib state confirmation signal. The squib state measuring unit 140 includes a squib check current intermittent circuit for passing a minute current to the squib 130 and a squib state detection circuit for measuring whether the wiring and the squib are normal. include

2 is a flowchart for explaining a control method of an electronic ignition system according to another embodiment.

Referring to FIG. 2 , in step 200, the squib status check signal is applied to first check the status of the squib. In steps 202 to 206, if the squib is normal, the loading signal is applied and the loading power is supplied. At this time, the charging power goes through the ignition power deceleration circuit, and the rising speed of the power is reduced. In steps 208 and 210, the loading power is supplied, and the loading state is checked through the loading confirmation circuit. In step 212, if the loading state is normal, an ignition signal is applied to ignite the squib. In steps 214 and 216, it is confirmed that the squib is ignited normally by applying the squib status confirmation signal, and then the process is terminated.

3 is a detailed circuit diagram of the ignition power loading unit 110 shown in FIG.

Referring to FIG. 3 , the ignition power loading unit 110 includes an ignition power deceleration circuit 111 and a loading check circuit 112 .

)는 순간적으로 도통이되고 Q2의 게이트-소스 전극 사이의 전압(

)은 다음 수학식 1과 같다.In the absence of ignition power deceleration circuit, when ignition power with fast rising speed is input to Q2 (P-channel FET), the parasitic capacitance inherent in Q2 (

) instantaneously conducts and the voltage between the gate-source electrode of Q2 (

) is the same as Equation 1 below.

[Equation 1]

가 임계전압(Vth)보다 작게되면, 즉

가 되면, Q2는 예기치 않게 턴온이 된다. 착화전원 입력단에 저항과 캐패시터로 구성되는 저역필터를 장착하면 이러한 현상을 방지한다. 하지만 필터의 저항이 고 용량의 착화전류를 견디기 위해서는 부피가 커지는 문제가 있어 공간 제약이 있는 소형 시스템에는 부적합한 방법이다. 또한 Q2에 공급되는 전압이 필터의 저항에 흐르는 전류량에 따라 변화하는 단점이 있다. 실시 예에서, 이러한 문제를 해결하기 위해 저항보다 부피가 작아 소형화에 유리하고, 고 전류가 흐를 때도 전압강하가 작은 장점이 있는 전계효과 트랜지스터를 저항대신에 사용한다. At this time,

When is less than the threshold voltage (Vth), i.e.

, Q2 turns on unexpectedly. If a low-pass filter composed of a resistor and a capacitor is installed at the ignition power input terminal, this phenomenon is prevented. However, the resistance of the filter has a problem in that the volume increases in order to withstand a high-capacity ignition current, so this method is not suitable for a small system with space limitations. Also, there is a disadvantage that the voltage supplied to Q2 varies according to the amount of current flowing through the resistor of the filter. In an embodiment, in order to solve this problem, a field effect transistor having an advantage of smaller volume than a resistor, which is advantageous for miniaturization, and a small voltage drop even when a high current flows, is used instead of a resistor.

가 Vth 비해 충분히 작으면 완전히 턴온되어 출력저항이 수십 mΩ 정도로 작아진다. 정상적인 착화상황에서는

가 Vth에 비해 충분히 작게 제어되므로 착화전류가 많이 흐를 경우에도 전압 강하가 거의 없어 Q2에 손실없이 착화전원을 공급할 수 있다. For P-channel field effect transistor

If is sufficiently smaller than Vth, it is completely turned on and the output resistance is reduced to about several tens of mΩ. Under normal ignition conditions

is controlled to be small enough compared to Vth, so even when the ignition current flows a lot, there is almost no voltage drop, so the ignition power can be supplied to Q2 without loss.

가 Vth근처의 값을 갖게 되면 전계효과 트랜지스터의 출력저항은 수 Ω 정도로 커진다. 기생 커패시턴스로 인해 순간적으로 턴온되는 시점에서도

가 Vth 근처의 값을 가지므로 전계효과 트랜지스터의 출력저항은 수 Ω 정도로 커진다. 이렇게 저항이 커지는 특성을 이용하여 전계효과 트랜지스터의 출력(드레인)과 접지사이에 커패시터(C2)를 추가하게 되면 순간적으로 흐르는 전류의 차단이 가능한 RC 저역 필터를 만들 수 있다. 도 3에 도시된 것처럼, 착화전원 감속회로(111)는 전술한 전계효과 트랜지스터를 이용한 RC 저역필터로 구성되어 있다. Q1이 p-channel 전계효과 트랜지스터이고 커패시터(C2)가 전계효과 트랜지스터의 출력과 접지사이에 연결된 커패시터이다. 커패시터(C1)는 기생 커패시턴스에 의해 턴온되는 순간

의 하강시점을 지연시켜 Q1에 흐르는 전류를 감소시키는데 도움을 준다.On the other hand

When α has a value near Vth, the output resistance of the field effect transistor increases by several Ω. Even at the moment of momentary turn-on due to parasitic capacitance

has a value near Vth, so the output resistance of the field effect transistor increases to about several Ω. If a capacitor C2 is added between the output (drain) of the field effect transistor and the ground using this characteristic of increasing resistance, an RC low-pass filter capable of blocking the instantaneous current can be made. As shown in Fig. 3, the ignition power deceleration circuit 111 is composed of an RC low-pass filter using the above-described field effect transistor. Q1 is a p-channel field effect transistor and capacitor C2 is a capacitor connected between the output of the field effect transistor and ground. The moment capacitor C1 is turned on by parasitic capacitance

It helps to reduce the current flowing in Q1 by delaying the falling time of Q1.

The charge check circuit 112 serves to check whether the ignition power is output to the drain of Q2 when a charge signal is applied to the gate of Q2. The charging power supplied while Q2 is turned on is divided by R6 and R7 to turn on Q3. When Q3 is turned on, a part of the ignition power drives the photodiode of the photocoupler U1 through R4, which turns on the transistor of U1 to load. Make the confirmation signal output from low to high. Photocoupler U1 also plays a role in blocking the mutual influence of the two power sources by separating the ground of the ignition power from the ground of the digital circuit. In addition, since there is no complicated circuit such as an A/D conversion circuit, the circuit is simplified, which is advantageous for small size and low cost, and has the advantage of being able to check the loading result in real time.

In the embodiment, the photocoupler U1 is used, but the present invention is not limited thereto, and the solid state relay SSR may be driven to output a loading confirmation signal.

4 is a detailed circuit diagram of the ignition current output circuit 120 and the squib state measurement unit 140 shown in FIG. 1 .

Referring to FIG. 4 , the ignition current output circuit 120 , the squib 130 , and the squib state measurement unit 140 are illustrated. The squib state measurement unit 140 includes a squib check current control circuit 141 and a squib state detection circuit 142 .

The ignition current output circuit 120 is turned on according to the high-side ignition signal, the high-side switch (circuit) connected to one electrode of the squib, is turned on according to the low-side ignition signal, and is connected to the other electrode of the squib. Includes a low-side switch (circuit). The ignition current output circuit 120 applies the decelerated charging power to the squib 130 through the ignition power loading unit shown in FIG. 3 when both the high-side switch and the low-side switch are turned on.

The squib check current control circuit 141 includes a transistor Q1, a photocoupler U1, and resistance elements R1 to R4, and the squib state detection circuit 142 includes a photocoupler U2 and a resistance element. R5 and R6 and an inverter.

When the squib status check signal is applied, Q1 is turned on, and current flows to the photodiode of U1 through R1 to turn on the transistor. At this time, the squib status check power goes through R3, squib, and R6 to drive the photodiode of U2, which turns on the transistor of U2 to output that the squib status is normal. If there is a problem with the squib or the connector and wiring connecting the squib, the squib status check power cannot flow to the photodiode of U2, so the squib status signal outputs that there is an error in the squib system.

The check current must be small enough not to ignite the squib, and R3 plays this role. R3 can be divided into two or more resistors in case of failure. R6 not only protects the photodiode by limiting the amount of current flowing to U2 when an ignition signal is applied to the ignition current output circuit and a normal ignition current flows in the squib, but also protects the squib due to malfunction of the high-side circuit. When ignition power is supplied, it prevents a large current from flowing through the photodiode of U2 to prevent erroneous ignition.

The squib check current control circuit according to the embodiment may be composed of a photocoupler or a solid state relay, a circuit controlling the current required to emit light of the photodiode, and the phototransistor by detecting the light emission of the photodiode. It is controlled so that a sufficiently small current that cannot ignite it can flow.

The squib state detection circuit according to the embodiment limits the amount of current flowing to the photodiode of the photocoupler or solid state relay when the ignition current flows in the squib to protect the photodiode, and the High Side of the ignition current output circuit When ignition power is supplied to the squib due to a malfunction of the circuit, a large current flows through the photocoupler or the photodiode of the solid state relay to prevent accidental ignition of the squib.

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited to the above embodiments, and various modifications and variations from these descriptions can be made by those skilled in the art to which the present invention pertains. possible. Therefore, the scope of the present invention should not be limited to the embodiments, but should be defined by the claims described below as well as the claims and equivalents.

An embodiment of the present invention may also be implemented in the form of a recording medium including instructions executable by a computer, such as a program module executed by a computer. Computer-readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. Also, computer-readable media may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism, and includes any information delivery media.

The foregoing description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains will understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. . Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and likewise components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

Claims (12)

In the electronic ignition system,
an ignition power deceleration circuit for delaying the rise time of the ignition power supplied to the ignition device;
a loading check circuit for checking whether the ignition power decelerated by the ignition power deceleration circuit is loaded;
an ignition current output circuit for supplying the charging power decelerated by the ignition power deceleration circuit to the squib;
a squib check current control circuit providing a check current to the squib for checking the squib; and
and a squib state detection circuit for detecting whether the check current flows through the squib. The method of claim 1,
The ignition power reduction circuit,
a first transistor, a first capacitor and a first resistor connected between the input source electrode of the first transistor and ground, and a second capacitor connected between the output drain electrode of the first transistor and the ground Electronic ignition system with 3. The method of claim 2,
The first transistor is an electronic ignition system, characterized in that the P-channel FET. 3. The method of claim 2,
The loading confirmation circuit is
When a loading signal is applied to the gate electrode of the second transistor, it is checked whether the decelerated ignition power is applied to the loading check circuit through the input source electrode of the second transistor,
The electronic ignition system, characterized in that the decelerated charging power is applied to the ignition current output circuit through the output drain electrode of the second transistor. 5. The method of claim 4,
The loading confirmation circuit is
second and third resistors connected in parallel to divide the ignition power;
fourth and fifth resistors connected in parallel to divide the charging power;
a third transistor turned on according to the divided charging voltage of the charging power;
a first photocoupler connected to the fourth resistor and the input electrode of the third transistor and including a first photodiode and a fourth transistor; and
Electronic ignition system including a first output unit for outputting the loading confirmation signal according to the first output signal from the first photocoupler. 6. The method of claim 5,
The loading confirmation circuit is
When the divided charging voltage of the charging power is applied to the gate electrode of the third transistor, the divided ignition voltage of the ignition power is applied to the first photocoupler to output the charging confirmation signal Electronic ignition system. The method of claim 1,
The squib check current intermittent circuit,
a fifth transistor turned on when a squib status check signal is applied;
a second photocoupler turned on when the fifth transistor is turned on and a predetermined voltage is applied; and
When the second photocoupler is turned on, the squib status check power is applied to the electronic ignition system, characterized in that it includes a squib check resistor for allowing a current less than a predetermined threshold value to flow through the squib. 8. The method of claim 7,
The ignition current output circuit,
a high-side switch turned on according to a high-side ignition signal and connected to one electrode of the squib;
a low-side switch turned on according to the low-side ignition signal and connected to the other electrode of the squib;
When both the high-side switch and the low-side switch are turned on, the electronic ignition system according to claim 1, wherein the decelerated charging power is applied to the squib. 9. The method of claim 8,
The squib state detection circuit,
a squib state checking resistor connected to the other electrode of the squib;
a third photocoupler connected to the squib state checking resistor;
and a third output unit for outputting a squib state signal according to a third output signal from the third photocoupler. In the control method of the electronic ignition system,
delaying the rise time of the ignition power supplied to the ignition device;
checking whether the decelerated ignition power source is loaded;
supplying the decelerated charging power to a squib;
providing a check current to the squib for checking the squib; and
and detecting whether the check current flows through the squib. In the control method of the electronic ignition system according to claim 1,
applying a squib status check signal;
applying a loading signal when the squib status signal is normal;
driving the ignition power deceleration circuit;
providing charging power;
when the loading confirmation signal is normally output, applying an ignition signal;
applying the squib status check signal; and
Control method of the electronic ignition system comprising the step of checking the squib state signal. A recording medium recording a program for executing the control method of the electronic ignition system according to claim 10 or 11 in a computer.

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