Ignition chip for an ignition device and ignition control method thereof

Abstract

The application provides a kind of ignition chip for igniter and its ignition control method, can prevent ignition device from being triggered by stray current and other external interference, greatly improve the safety, including signal input terminal, digital processing unit, digital processing unit is connected with signal input terminal;Security switch unit is arranged between the signal input terminal and firing resistance, the digital processing unit is connected with the security switch unit;Ignition switch unit includes upper bridge switch tube and lower bridge switch tube, upper bridge switch tube and the lower bridge switch tube are connected with the digital processing unit respectively, the signal input terminal is inputed to the signal input terminal by the digital processing unit, and the upper bridge switch tube and the lower bridge switch tube are controlled;The digital processing unit receives the instruction signal inputed by the signal input terminal, while opening the security switch unit and the ignition switch unit, the signal input terminal and the loop of firing resistance are conducted to ignite.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of igniters, in particular to an ignition chip for an igniter and an ignition control method thereof. BACKGROUND

[0002] The ignition process of the igniter on the market is usually single-energy initiation: a certain current is connected, the electric energy is converted into heat energy to ignite the ignition head, and the burning flame ignites the ignition powder to initiate immediately. The current scheme is simple to control, but the safety precautions are poor, and the igniter may be triggered by stray current and other external disturbances. The current design and production of the igniter have higher safety requirements;

[0003] The Chinese utility model patent with publication number CN203595461U discloses a high-voltage ignition relay, which adopts high-voltage steep pulse for ignition, microcontroller technology and serial communication technology for ignition control, and address verification and password verification for safety unlocking, but the control verification is too complex and the implementation cost is high. SUMMARY

[0004] In view of the above problems, the present application provides an ignition chip for an igniter and an ignition control method thereof, which can prevent the igniter from being triggered by stray current and other external disturbances, greatly improving the safety.

[0005] The technical scheme is as follows: an ignition chip for an igniter, comprising a signal input end, the signal input end is connected with a firing module, the firing module comprises a firing resistor, and further comprising:

[0006] a digital processing unit connected with the signal input end;

[0007] a security switch unit arranged between the signal input end and the firing resistor, the digital processing unit being connected with the security switch unit;

[0008] a firing switch unit comprising an upper bridge switch tube and a lower bridge switch tube, the upper bridge switch tube and the lower bridge switch tube being arranged between the positive input end and the firing resistor and between the negative input end and the firing resistor respectively, the upper bridge switch tube and the lower bridge switch tube being connected with the digital processing unit, and the digital processing unit receiving signals input by the signal input end to control the upper bridge switch tube and the lower bridge switch tube;

[0009] the digital processing unit receiving instruction signals input by the signal input end, and when the security switch unit and the firing switch unit are turned on, the signal input end and the firing resistor are connected in a loop to ignite.

[0010] Further, an ignition switch detection unit connected to the digital processing unit and the ignition switch unit for detecting the ignition switch unit.

[0011] Further, the security switch unit comprises a security switch tube connected to the digital processing unit; the signal input end comprises a positive input end and a negative input end, the ignition switch unit comprises an upper bridge switch tube and a lower bridge switch tube, the upper bridge switch tube and the lower bridge switch tube are arranged between the positive input end and the ignition resistor and between the negative input end and the ignition resistor respectively, the upper bridge switch tube and the lower bridge switch tube are connected to the digital processing unit, and the digital processing unit controls the upper bridge switch tube and the lower bridge switch tube according to the signal input by the signal input end.

[0012] Further, the ignition switch detection unit comprises an upper bridge detection module and a lower bridge detection module, the upper bridge detection module is connected to the upper bridge switch tube, the lower bridge detection module is connected to the lower bridge switch tube, and the digital processing unit judges the state of the upper bridge switch tube and the lower bridge switch tube according to the voltage on the upper bridge switch tube and the lower bridge switch tube detected by the upper bridge detection module and the lower bridge detection module.

[0013] Further, the upper bridge detection module and the lower bridge detection module each comprise a sampling resistor, the sampling resistor is also connected to a power supply, the sampling resistor is connected to the upper bridge switch tube and the lower bridge switch tube respectively, and the sampling resistor is connected to the digital processing unit for feeding back the collected voltage to the digital processing unit.

[0014] Further, a first power supply and a second power supply are further included, the first power supply is connected to a storage device, the first power supply and the second power supply are used for receiving the converted voltage of an external power supply for power supply, the first power supply is connected to the digital processing unit for power supply of the digital processing unit, and the second power supply is connected to the digital processing unit and is controlled by the digital processing unit.

[0015] Further, the upper bridge switch tube and the lower bridge switch tube are further respectively connected with an upper bridge switch tube pre-driving module and a lower bridge switch tube pre-driving module, the upper bridge switch tube pre-driving module and the lower bridge switch tube pre-driving module are respectively connected with the digital processing unit, the lower bridge switch tube pre-driving module is connected with the second power supply, the upper bridge switch tube pre-driving module is connected with the signal input end, the upper bridge switch tube pre-driving module and the lower bridge switch tube pre-driving module comprise a pre-driving switch tube, when the upper bridge switch tube and the lower bridge switch tube are turned on, the digital processing unit first sends a command to turn on the pre-driving switch tube in the upper bridge switch tube pre-driving module and the lower bridge switch tube pre-driving module, and then completely turns on the upper bridge switch tube and the lower bridge switch tube after the pre-driving switch tube is turned on.

[0016] The pre-driving switch tube of the upper bridge switch tube pre-driving module adopts a PMOS tube Q4, the G pole of the PMOS tube Q4 is connected with the I / O port of the digital processing unit, the D pole of the PMOS tube Q4 is grounded, the S pole of the PMOS tube Q4 is connected with the G pole of the upper bridge switch tube through the resistance R6, the resistance R5 is connected between the G pole and the D pole of the upper bridge switch tube, and the D pole of the upper bridge switch tube is further connected with the S pole of the security switch tube.

[0017] The pre-driving switch tube of the lower bridge switch tube pre-driving module adopts an NMOS tube Q12, the D pole of the NMOS tube Q12 is connected with the G pole of the lower bridge switch tube through the resistance R11, the S pole of the NMOS tube Q12 is connected with the output end of the second power supply, the resistance R15 is connected between the S pole and the G pole of the NMOS tube Q12, the G pole of the NMOS tube Q12 is connected with the C pole of the switch tube Q9 through the resistance R16, the B pole of the switch tube Q9 is connected with the +5V power supply, the E pole of the switch tube Q9 is connected with the I / O port of the digital processing unit through the resistance R13, the I / O port of the digital processing unit connected with the E pole of the switch tube Q9 is further connected with the B pole of the switch tube Q10 through the resistance R14, the E pole of the switch tube Q10 is grounded, and the C pole of the switch tube Q10 is connected with the G pole of the lower bridge switch tube through the resistance R12.

[0018] Further, the EMC suppression unit connected with the firing resistance is further included, the EMC suppression unit comprises a TVS tube and a discharge resistance, and is used for suppressing the interference of the loop where the firing resistance is located.

[0019] Further, the signal receiving unit is further included, the signal receiving unit is arranged between the signal input end and the digital processing unit, the signal receiving unit comprises a voltage dividing resistance and a filter capacitor, the signal receiving unit captures the command signal input by the signal input end through the voltage dividing resistance, and inputs the captured signal to the digital processing unit.

[0020] Further, the anti-reverse connection unit is arranged between the signal input end and the security switch unit, and the anti-reverse connection unit comprises an anti-reverse connection MOS tube connected with the digital processing unit.

[0021] A kind of ignition control method for the ignition chip of the above-mentioned ignition device, comprising the following steps:

[0022] Internal detection: the ignition switch detection unit detects whether the upper bridge switch tube and the lower bridge switch tube of the ignition switch unit are normal;

[0023] External detection: after detecting that the ignition switch unit is normal, input instruction signal from the signal input end, the digital processing unit receives instruction signal, controls the upper bridge switch tube pre-drive module and the lower bridge switch tube pre-drive module, and the instruction signal is given to the firing resistance detection by the external ignition control system;

[0024] Ignition: after detecting normal by the external ignition control system, the digital processing unit receives instruction signal, and successively turns on the security switch unit and the ignition switch unit, so that the loop of the firing resistance is conducted to ignite.

[0025] Compared with the prior art, the ignition chip for the ignition device has the following advantages:

[0026] From the current single energy type initiation to the instruction type initiation, the digital processing unit receives instruction signal to turn on the security switch unit, and after the security switch unit is turned on, the ignition switch unit is powered on, the digital processing unit receives instruction signal to turn on the ignition switch unit, and only after the security switch unit and the ignition switch unit are turned on successively, the loop from the signal processing end to the firing resistance is completely conducted, so that ignition can be performed, which greatly improves safety and prevents the ignition device from being triggered due to stray current and other external interference, and reduces the design requirements and production difficulty of the ignition device.

[0027] Furthermore, the ignition chip for the ignition device can also perform fault self-detection and diagnosis, before inputting instruction signal, the ignition switch detection unit can detect whether the ignition switch unit is normal, if there is a fault, the subsequent operation is not performed, and if there is no fault, the corresponding initiation control work is performed according to the instruction signal, which further improves safety. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a component unit block diagram of the ignition chip for the ignition device in one embodiment;

[0029] Figure 2 It is a component unit module block diagram of the ignition chip for the ignition device in another embodiment;

[0030] Figure 3 A composition unit module block diagram of a firing chip for a lighter in the third embodiment;

[0031] Figure 4 A circuit diagram of a connection of an upper bridge switch tube pre-driving module and a lower bridge switch tube pre-driving module of a firing chip for a lighter in the third embodiment to the upper and lower bridge switch tubes;

[0032] Figure 5 A step schematic diagram of a firing control method of a firing chip for a lighter in the embodiment. DETAILED DESCRIPTION

[0033] The technical solutions of the present application will be described clearly and completely in combination with the drawings and specific embodiments, but those skilled in the art will understand that the following described embodiments are part of the embodiments of the present application, not all the embodiments, and are only used to illustrate the present application, and should not be regarded as limiting the scope of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0034] See Figure 1 The firing chip for a lighter of the present application comprises a signal input end, the signal input end is connected to a firing module, the firing module is a device outside the firing chip and is a device required for firing of the lighter, the firing module usually comprises a firing resistor 2, when a signal processing end is conducted with a loop in which the firing resistor is located, the signal processing end inputs a voltage, the firing resistor is electrified and sharply heated, and the highest heating temperature of the firing resistor is usually higher than the ignition point of the agent, so that the agent can be ignited,

[0035] In the embodiment, the firing chip further comprises:

[0036] A digital processing unit 200, the digital processing unit 200 is connected to the signal input end, and the digital processing unit 200 can adopt a low-power control chip;

[0037] A security switch unit 300, the security switch unit 300 is arranged between the signal input end and the firing resistor 2, and the digital processing unit 300 is connected to the security switch unit 200;

[0038] A firing switch unit, the firing switch unit is arranged between the signal input end and the firing resistor 2, and the digital processing unit 200 is further connected to the firing switch unit;

[0039] A firing switch detection unit, the firing switch detection unit is respectively connected to the digital processing unit 200 and the firing switch unit, and is used for detecting the firing switch unit;

[0040] The digital processing unit 200 receives the instruction signal from the signal input end, so that the security switch unit 300 and the ignition switch unit are turned on, and when the security switch unit 300 and the ignition switch unit are turned on at the same time, the circuit in which the signal input end and the ignition resistor 2 are located is turned on to perform ignition.

[0041] In an embodiment of the present application, the security switch unit 300 includes a security switch tube, and the security switch tube is connected to the input and output port of the digital processing unit 200, so that the digital processing unit 200 can control the conduction of the security switch tube.

[0042] In the embodiment, the signal input end includes a positive input end 101 and a negative input end 102, and the ignition switch unit includes an upper bridge switch tube 401 and a lower bridge switch tube 402, the upper bridge switch tube 401 is arranged between the positive input end 101 and the ignition resistor 2, and the lower bridge switch tube 402 is arranged between the negative input end 102 and the ignition resistor 2, the upper bridge switch tube 401 and the lower bridge switch tube 402 are respectively connected to the digital processing unit 200, and the digital processing unit 200 can receive the signal input by the signal input end to control the upper bridge switch tube 401 and the lower bridge switch tube 402, when the control system of the external driving ignition device needs to perform self-checking on the ignition device, the ignition chip can control the opening of the security switch unit 300 and the ignition switch unit 400 according to the received instruction signal, and the upper bridge switch tube 401 and the lower bridge switch tube 402 are detected by the external control system according to the instruction signal.

[0043] In the embodiment, a first power supply 500 and a second power supply 600 are further included, the first power supply 500 is connected to an energy storage device, in the embodiment, the energy storage device is a capacitor 1, the energy storage device is connected to the security switch unit 300 and then connected to the second power supply 600, the first power supply 500 and the second power supply 600 receive the converted voltage of the external power supply to supply power, the first power supply 500 is connected to the digital processing unit 200, the voltage input from outside is converted by the first power supply 500 to supply power to the digital processing unit 200, the second power supply 600 is connected to the digital processing unit 200, and the second power supply 200 is connected to the upper bridge switch tube 401 and the lower bridge switch tube 402 to supply power to the upper bridge switch tube 401 and the lower bridge switch tube 402.

[0044] In the embodiment, a signal receiving unit 700 is further included, the signal receiving unit 700 is arranged between the signal input end and the digital processing unit 200, the signal receiving unit 700 includes a voltage dividing resistor and a filter capacitor, the signal receiving unit 700 captures the instruction signal input by the signal input end through the voltage dividing resistor, and inputs the captured signal to the digital processing unit 200.

[0045] The application of the ignition chip for the igniter in the embodiment makes the igniter upgrade from the current single energy initiation to the command initiation, and the digital processing unit is powered by the first power supply when the initiation is controlled, the digital processing unit opens the safety switch tube of the safety switch unit after receiving the command signal converted by the signal receiving unit, the second power supply is powered on after the safety switch tube is opened, the ignition switch unit is powered on after the safety switch unit is opened, and the upper bridge switch tube and the lower bridge switch tube of the ignition switch unit are opened only after the digital processing unit receives the command signal, only when the safety switch tube of the safety switch unit, the upper bridge switch tube and the lower bridge switch tube of the ignition switch unit are all opened in sequence, the loop of the signal input end and the firing resistor is completely conducted, so that the ignition can be performed, and the safety is greatly improved, and the igniter can be prevented from being triggered by stray current and other external interference.

[0046] The safety and reliability of the igniter are improved by adding the ignition chip for the igniter in the embodiment to the existing igniter, the ignition chip communicates with the chip in the mode of the command signal, and the related circuit in the chip is controlled to work, so that the igniter cannot be triggered by mistake.

[0047] See Figure 2 In one embodiment of the present application, on the basis of the above-mentioned embodiment, an ignition switch detection unit is further arranged, the ignition switch detection unit comprises an upper bridge detection module 801 and a lower bridge detection module 802, the upper bridge detection module 801 is connected with the upper bridge switch tube 401, the lower bridge detection module 802 is connected with the lower bridge switch tube 402, and the digital processing unit 200 judges the state of the upper bridge switch tube 401 and the lower bridge switch tube 402 by receiving the voltage 402 on the upper bridge switch tube 401 and the lower bridge switch tube 402 detected by the upper bridge detection module 801 and the lower bridge detection module 802, so as to ensure that the upper bridge switch tube 401 and the lower bridge switch tube 402 are available and undamaged.

[0048] In the embodiment, the upper bridge detection module 801 and the lower bridge detection module 802 are respectively provided with a sampling resistor, the sampling resistor is further connected with a power supply, the sampling resistor is connected with the upper bridge switch tube 401 and the lower bridge switch tube 402 respectively, and the sampling resistor is connected with the digital processing unit and used for feeding back the collected voltage to the digital processing unit, the upper bridge detection module 801 introduces a specific voltage and diagnoses the voltage at the node of the upper bridge switch tube 401 to identify whether the upper bridge switch tube 401 circuit is normal, and the lower bridge detection module 802 actively introduces a specific voltage and diagnoses the voltage at the node of the lower bridge switch tube 402 to identify whether the lower bridge switch tube 402 circuit is normal, if the upper bridge switch tube 401 and the lower bridge switch tube 402 are damaged, the voltage values sampled by the upper bridge detection module 801 and the lower bridge detection module 802 are different.

[0049] The ignition switch detection unit can detect whether the ignition switch unit is normal before inputting the instruction signal, if there is a fault, the subsequent operation is not performed, if there is no fault, the corresponding detonation control work is performed according to the instruction signal, and the safety is further improved.

[0050] In an embodiment of the present application, the EMC suppression unit 900 connected with the ignition resistor is further included, the EMC suppression unit 900 includes a TVS tube and a discharge resistor, and is used for suppressing the interference of the loop in which the ignition resistor is located.

[0051] In an embodiment of the present application, the positive and negative input ends are arranged at the signal input end, and the anti-reverse connection unit 1000 is further arranged, the anti-reverse connection unit 1000 is arranged between the signal input end and the safety switch unit 300, and the anti-reverse connection unit includes an anti-reverse connection MOS tube, and the anti-reverse connection MOS tube is connected with the digital processing unit 200.

[0052] See Figure 3 In an embodiment of the present application, on the basis of the foregoing Figure 2 In an embodiment of the present application, on the basis of the foregoing

[0053] See Figure 4 The pre-drive switch tube of the upper bridge switch tube pre-drive module adopts a PMOS tube Q4, the G pole of the PMOS tube Q4 is connected with the I / O port DRV2 of the digital processing unit, the D pole of the PMOS tube Q4 is grounded, the S pole of the PMOS tube Q4 is connected with the resistance R6 and then connected to the G pole of the upper bridge switch tube, the resistance R5 is connected between the G pole and the D pole of the upper bridge switch tube, the D pole of the upper bridge switch tube Q5 is further connected with the S pole of the safety switch tube and then connected to the signal input end.

[0054] The pre-driving switch tube of the lower bridge switch tube pre-driving module adopts an NMOS tube Q12, the D pole of the NMOS tube Q12 is connected to the G pole of the lower bridge switch tube after being connected to the resistor R11, the S pole of the NMOS tube Q12 is connected to the output end of the second power supply U2, the S pole and the G pole of the NMOS tube Q12 are connected with the resistor R15, the G pole of the NMOS tube Q12 is connected to the C pole of the switch tube Q9 after being connected to the resistor R16, the B pole of the switch tube Q9 is connected to the +5V power supply, the E pole of the switch tube Q9 is connected to the I / O port DRV3 of the digital processing unit after being connected to the resistor R13, the I / O port DRV3 of the digital processing unit connected to the E pole of the switch tube Q9 is further connected to the B pole of the switch tube Q10 after being connected to the resistor R14, the E pole of the switch tube Q10 is grounded, the C pole of the switch tube Q10 is connected to the G pole of the lower bridge switch tube after being connected to the resistor R12, when the I / O port DRV3 of the digital processing unit outputs a low level, Q9 is turned on, a voltage difference is generated by the resistor, Q9 is turned on further to make the pre-driving switch tube NMOS tube Q12 turned on, when the I / O port DRV3 of the digital processing unit outputs a high level, Q9 is turned off, Q10 is turned on, and Q10 plays a role of rapid discharge.

[0055] The ignition chip is added between the driving input and the ignition device on the basis of the original ignition device, the positive and negative poles are inputted after being distinguished by the two foot of the original ignition device, and the peripheral circuit of the ignition chip is simple.

[0056] In the case that the security switch tube is closed, the upper bridge detection module actively introduces a specific voltage and diagnoses the voltage at the circuit node to identify whether the upper bridge switch tube circuit is normal, and the lower bridge detection module actively introduces a specific voltage and diagnoses the voltage at the circuit node to identify whether the lower bridge switch tube circuit is normal. The chip immediately performs corresponding diagnosis by using the upper bridge detection module and the lower bridge detection module after being powered on.

[0057] The signal receiving unit captures the input instruction signal, including the control of the security switch tube, the upper bridge switch tube and the lower bridge switch tube, to cooperate with the external circuit to diagnose the firing resistor. Only after the upper bridge detection module and the lower bridge detection module diagnose and confirm that the upper bridge switch tube and the lower bridge switch tube circuit are normal, the security switch tube, the upper bridge switch tube and the lower bridge switch tube can be operated correspondingly. The second power supply supplies power to the pre-driving module inside the upper bridge switch tube and the lower bridge switch tube. Only when the security switch tube, the upper bridge switch tube and the lower bridge switch tube are all turned on, the firing resistor can be driven.

[0058] See Figure 5 In the embodiment of the application, an ignition control method for the ignition chip of the ignition device is also provided, and the method is realized based on the ignition chip of the ignition device in the above embodiment, and includes the following steps:

[0059] Step 1: internal detection: the ignition switch detection unit detects whether the upper bridge switch tube and the lower bridge switch tube of the ignition switch unit are normal;

[0060] Step 2: external detection: after detecting that the ignition switch unit is normal, the instruction signal is input from the signal input end, the digital processing unit receives the instruction signal, and the upper bridge switch tube pre-drive module and the lower bridge switch tube pre-drive module are controlled by the external ignition control system to give the instruction signal for the firing resistor detection;

[0061] Step 3: ignition: after the external ignition control system detects that it is normal, the digital processing unit receives the instruction signal, and the safety switch unit and the ignition switch unit are turned on in turn, so that the circuit of the firing resistor is turned on for ignition.

[0062] In the embodiment, the digital processing unit controls the working process of the whole chip:

[0063] 1. The digital processing unit turns on the anti-reverse diode in the anti-reverse module;

[0064] 2. According to the signal fed back by the upper and lower bridge detection modules, it is judged whether the upper bridge switch tube and the lower bridge switch tube circuit are normal, if there is a fault, the subsequent operation is not performed, if there is no fault, the corresponding work is performed according to the instruction signal of the signal input end;

[0065] 3. If the control system of the external driving ignition device needs to self-check the ignition device, the chip opens the safety switch tube according to the instruction signal received by the signal receiving unit, enables the second power supply, and then controls the upper bridge switch tube and the lower bridge switch tube according to the instruction, and the external control system judges according to the detected signal;

[0066] 4. When the external control system needs to work the firing resistor, the chip opens the safety switch tube, the upper bridge switch tube and the lower bridge switch tube according to the instruction signal received by the signal receiving unit, and triggers the ignition.

[0067] The application of the ignition chip of the application makes the ignition device upgrade from the current single energy type initiation to the instruction type initiation, isolates the ignition element from the external ignition signal, actively performs self-checking after the chip is powered on, and performs corresponding detection according to the external instruction requirement and the external circuit, the initiation power supply is controlled, the safety of the ignition device is greatly improved, and the design requirement and production difficulty of the ignition device explosive part are reduced.

[0068] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other present or future devices possess. That is, although specific embodiments have been disclosed herein, one of ordinary skill in the art will appreciate that other embodiments can be practiced under the scope of the disclosure. For example, some well-known structures have not been described in detail or at all in order to avoid obscuring the concepts of the present application. Like reference numerals can be used to denote like elements throughout the description and figures.

[0069] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and practice described. Accordingly, all such variations are intended to be included within the scope of the present application as defined in the following claims.

Claims

1. A fire lighter for a fire lighter, comprising a signal input, which is connected to a firing module, which comprises a firing resistor, characterized in that, Also include: A digital processing unit connected with the signal input end; A security switch unit provided between the signal input end and the firing resistor, the digital processing unit being connected with the security switch unit; The ignition switch unit includes an upper bridge switch tube and a lower bridge switch tube, which are respectively provided between the positive input end and the firing resistor, and between the negative input end and the firing resistor, and are respectively connected with the digital processing unit, the digital processing unit receiving signals input by the signal input end to control the upper bridge switch tube and the lower bridge switch tube; The digital processing unit receives the instruction signal input by the signal input end, and when the security switch unit and the ignition switch unit are turned on at the same time, the circuit between the signal input end and the firing resistor is turned on for ignition; The security switch unit includes a security switch tube connected with the digital processing unit; the signal input end includes a positive input end and a negative input end; It also includes a first power supply and a second power supply, the first power supply being connected with an energy storage device, the first power supply and the second power supply being used to receive converted voltage from an external power supply for power supply, the first power supply being connected with the digital processing unit for power supply, and the second power supply being connected with the digital processing unit and being controlled by the digital processing unit; The upper bridge switch tube and the lower bridge switch tube are respectively connected with an upper bridge switch tube pre-driving module and a lower bridge switch tube pre-driving module, the upper bridge switch tube pre-driving module and the lower bridge switch tube pre-driving module being respectively connected with the digital processing unit, the lower bridge switch tube pre-driving module being connected with the second power supply, the upper bridge switch tube pre-driving module being connected with the signal input end, the upper bridge switch tube pre-driving module and the lower bridge switch tube pre-driving module including a pre-driving switch tube, the digital processing unit sending instructions to open the pre-driving switch tube in the upper bridge switch tube pre-driving module and the lower bridge switch tube pre-driving module respectively when the upper bridge switch tube and the lower bridge switch tube are turned on, and the upper bridge switch tube and the lower bridge switch tube being completely opened after the pre-driving switch tube is opened.

2. A firelighter chip for use in a firelighter according to claim 1, characterised in that Also include: An ignition switch detection unit connected with the digital processing unit and the ignition switch unit for detecting the ignition switch unit.

3. A firelighter chip for use in a firelighter according to claim 2, wherein: The ignition switch detection unit includes an upper bridge detection module and a lower bridge detection module, the upper bridge detection module being connected with the upper bridge switch tube, and the lower bridge detection module being connected with the lower bridge switch tube, the digital processing unit judging the state of the upper bridge switch tube and the lower bridge switch tube by receiving the voltage on the upper bridge switch tube and the lower bridge switch tube detected by the upper bridge detection module and the lower bridge detection module.

4. A firelighter chip for use in a firelighter according to claim 3, wherein: The upper bridge detection module and the lower bridge detection module respectively comprise a sampling resistor, the sampling resistor is also connected with a power supply, the sampling resistor is connected with the upper bridge switch tube and the lower bridge switch tube respectively, and the sampling resistor is connected with the digital processing unit, so as to feed back the collected voltage to the digital processing unit.

5. A firelighter chip for use in a firelighter according to claim 1, characterised in that: The pre-driving switch tube of the upper bridge switch tube pre-driving module adopts a PMOS tube Q4, the G pole of the PMOS tube Q4 is connected with the I / O port of the digital processing unit, the D pole of the PMOS tube Q4 is grounded, the S pole of the PMOS tube Q4 is connected with the resistor R6 and then connected to the G pole of the upper bridge switch tube, the resistor R5 is connected between the G pole and the D pole of the upper bridge switch tube, and the D pole of the upper bridge switch tube is also connected with the S pole of the security switch tube; The pre-driving switch tube of the lower bridge switch tube pre-driving module adopts an NMOS tube Q12, the D pole of the NMOS tube Q12 is connected with the resistor R11 and then connected to the G pole of the lower bridge switch tube, the S pole of the NMOS tube Q12 is connected to the output end of the second power supply, the resistor R15 is connected between the S pole and the G pole of the NMOS tube Q12, the G pole of the NMOS tube Q12 is connected with the resistor R16 and then connected to the C pole of the switch tube Q9, the B pole of the switch tube Q9 is connected with the +5V power supply, the E pole of the switch tube Q9 is connected with the resistor R13 and then connected to the I / O port of the digital processing unit, the I / O port of the digital processing unit connected with the E pole of the switch tube Q9 is also connected with the resistor R14 and then connected to the B pole of the switch tube Q10, the E pole of the switch tube Q10 is grounded, and the C pole of the switch tube Q10 is connected with the resistor R12 and then connected to the G pole of the lower bridge switch tube.

6. A firelighter chip for use in a firelighter according to claim 1, characterised in that: The EMC suppression unit connected with the firing resistor is further included, the EMC suppression unit comprises a TVS tube and a discharge resistor, and is used for suppressing the interference of the loop where the firing resistor is located; the anti-reverse connection unit is further included, the anti-reverse connection unit is arranged between the signal input end and the security switch unit, the anti-reverse connection unit comprises an anti-reverse MOS tube, the anti-reverse MOS tube is connected with the digital processing unit; the signal receiving unit is further included, the signal receiving unit is arranged between the signal input end and the digital processing unit, the signal receiving unit comprises a voltage dividing resistor and a filter capacitor, the signal receiving unit captures the instruction signal input by the signal input end through the voltage dividing resistor, and inputs the captured signal to the digital processing unit.

7. A method of ignition control of the ignition pellet for the igniter of claim 2, characterized by, The method comprises the following steps: Internal detection: the ignition switch detection unit detects whether the upper bridge switch tube and the lower bridge switch tube of the ignition switch unit are normal; External detection: after the ignition switch unit is detected to be normal, an instruction signal is input from the signal input end, the digital processing unit receives the instruction signal, controls the upper bridge switch tube pre-driving module and the lower bridge switch tube pre-driving module, and the external ignition control system gives an instruction signal to detect the firing resistor; Ignition: after the external ignition control system is detected to be normal, the digital processing unit receives the instruction signal, sequentially turns on the security switch unit and the ignition switch unit, so that the loop where the firing resistor is located is conducted to ignite.

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