Driving protection circuit for initiating explosive device

Abstract

The invention relates to a driving protection circuit for an initiating explosive device, belongs to the technical field of initiating explosive devices, and solves the problem of insufficient safety of an ignition driving circuit in the prior art. The driving protection circuit comprises a power supply power-on protection circuit, a capacitor charging protection circuit and an ignition control protection circuit; the power supply power-on protection circuit is connected with a power supply and is used for providing power-on protection when the power supply is powered on and providing charging energy for the capacitor charging protection circuit; the capacitor charging protection circuit is used for receiving the charging energy of the power supply power-on protection circuit under the control of the charging control signal and charging an internal energy storage capacitor; and the ignition control protection circuit is used for releasing the energy of the energy storage capacitor under the control of the ignition control signal to ignite the initiating explosive device load. And safe ignition of the initiating explosive device is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of initiators, and particularly to a drive protection circuit for initiators. Background Art

[0002] An initiator is a sensitive small ignition and explosion component. The success or failure of ignition often determines the success or failure of a test mission and the personal safety of the test participants. Therefore, it has high requirements for the safety of the ignition circuit.

[0003] Currently, the existing ignition drive circuits all use a single-chip microcomputer as the main chip for ignition control and a relay as the ignition control device, without controlling the capacitor charging circuit. The safety of this design is insufficient. Pulses output during the power-on reset of the single-chip microcomputer or fluctuations in the capacitor charging circuit may both cause accidental initiation.

[0004] Therefore, there is an urgent need for a new ignition drive circuit for initiators. Summary of the Invention

[0005] In view of the above analysis, embodiments of the present invention aim to provide a drive protection circuit for initiators to solve the problem of insufficient safety of the existing ignition drive circuit.

[0006] Embodiments of the present invention provide a drive protection circuit for initiators. The drive protection circuit includes a power-on protection circuit, a capacitor charging protection circuit, and an ignition control protection circuit;

[0007] The power-on protection circuit is connected to the power supply, and is used to provide power-on protection when the power supply is powered on and provide charging energy for the capacitor charging protection circuit;

[0008] The capacitor charging protection circuit is used to receive the charging energy of the power-on protection circuit under the control of a charging control signal and charge the internal energy storage capacitor;

[0009] The ignition control protection circuit is used to release the energy of the energy storage capacitor to detonate the initiator load under the control of an ignition control signal.

[0010] Based on a further improvement of the above drive protection circuit, the power-on protection circuit includes a protection resistor, a buffer capacitor, an on-voltage resistor R1, a first switch-type device, a power-on switch S, and a voltage-dividing protection resistor R2;

[0011] One end of the protection resistor is connected to the positive pole of the power supply; the other end of the protection resistor is simultaneously connected to one end of the buffer capacitor, one end of the on-voltage resistor R1, and the source port of the first switch-type device;

[0012] The drain port of the first switch-type device is connected to the capacitor charging protection circuit,

[0013] The other end of the buffer capacitor, the other end of the turn-on voltage resistor R1, and the gate port of the first switching device are simultaneously connected to one end of the power-on switch S; the other end of the power-on switch S is connected to one end of the voltage-dividing protection resistor R2, and the other end of the voltage-dividing protection resistor R2 is connected to the negative power supply terminal.

[0014] Based on the further improvement of the above driving protection circuit, the power-on protection circuit of the power supply further includes a device current-limiting resistor R3;

[0015] One end of the device current-limiting resistor R3 is connected to the gate port of the first switching device;

[0016] The other end of the device current-limiting resistor R3 is connected to one end of the power-on switch S, the other end of the buffer capacitor, and the other end of the turn-on voltage resistor R1.

[0017] Based on the further improvement of the above driving protection circuit, the protection resistor includes a plurality of branches connected in parallel with each other;

[0018] Among them, a bias resistor and a first fuse resistor are connected in series on one branch, and a second fuse resistor is provided on the remaining branches;

[0019] Among them, the resistance value of the first fuse resistor is the same as that of the second fuse resistor.

[0020] Based on the further improvement of the above driving protection circuit, the power-on switch S can be any one of the following:

[0021] Relay;

[0022] Thyristor;

[0023] MOS transistor.

[0024] Based on the further improvement of the above driving protection circuit, the capacitor charging protection circuit includes a second switching device, a diode D, and a storage capacitor;

[0025] The source port of the second switching device is connected to the drain port of the first switching device, the gate port of the second switching device is used to receive a charging control signal, and the drain port of the second switching device is connected to the positive pole of the diode D;

[0026] The negative pole of the diode D is simultaneously connected to the other end of the storage capacitor and one end of the initiator load;

[0027] The other end of the storage capacitor is connected to the negative power supply terminal.

[0028] Based on the further improvement of the above driving protection circuit, the capacitor charging protection circuit further includes a charging current-limiting resistor R4;

[0029] One end of the charging current-limiting resistor R4 is connected to the negative electrode of the diode D;

[0030] The other end of the charging current-limiting resistor R4 is simultaneously connected to the other end of the energy storage capacitor and one end of the initiator load.

[0031] Based on the further improvement of the above driving protection circuit, the ignition control protection circuit includes a third switching device and a discharging protection resistor R5;

[0032] The drain port of the third switching device and one end of the discharging protection resistor R5 are both connected to the other end of the initiator load;

[0033] The gate port of the third switching device is used to receive the ignition control signal;

[0034] The source port of the third switching device and the other end of the discharging protection resistor R5 are both connected to the negative power supply.

[0035] Based on the further improvement of the above driving protection circuit, the first switching device and the second switching device have the same structure, both including a plurality of P-type MOS transistors connected in sequence; the third switching device includes a plurality of N-type MOS transistors connected in sequence;

[0036] The source of the first MOS transistor is used as the source port, the drain of the last MOS transistor is used as the drain port, the source of the latter MOS transistor is connected to the drain of the previous MOS transistor, and the gates of all MOS transistors are connected and used as the gate port.

[0037] Based on the further improvement of the above driving protection circuit, the buffer capacitor and the energy storage capacitor have the same structure, both including a plurality of capacitors connected in parallel.

[0038] Compared with the prior art, the present invention can at least achieve one of the following beneficial effects:

[0039] 1. Through the triple protection of the power-on protection circuit, the capacitor charging protection circuit and the ignition control protection circuit, the safety of the initiator during detonation is greatly improved, and the threat to personnel is reduced;

[0040] 2. The buffer capacitor in the power-on protection circuit reduces the voltage peak at the moment of power-on, enabling the driving protection circuit to start slowly. At the same time, the over-current protection function is realized through the protection resistor, ensuring that the capacitor charging protection circuit and the ignition control protection circuit connected to the rear stage cannot draw power from the power supply when not working and reducing the damage to the rear-stage circuit caused by the spike voltage at the moment of power-on, thus ensuring power-on safety;

[0041] 3. The diode in the capacitor charging protection circuit prevents the reverse charging into the power-on protection circuit when the energy storage capacitor discharges. The charging current-limiting resistor adjusts the power during the charging of the energy storage capacitor, preventing the energy storage capacitor from entering the charging state in the standby state and ensuring charging safety.

[0042] 4. The discharge protection resistor in the ignition control protection circuit prevents the energy storage capacitor from detonating the initiator during misdischarge, improving the safety of the detonation process.

[0043] In the present invention, the above technical solutions can also be combined with each other to achieve more preferred combination schemes. Other features and advantages of the present invention will be described in the subsequent description. Moreover, some advantages can be made obvious from the description or understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained from the content specifically pointed out in the description and the drawings. Description of the Drawings

[0044] The drawings are only for the purpose of showing specific embodiments and are not considered as a limitation to the present invention. Throughout the drawings, the same reference signs represent the same components.

[0045] Figure 1 It is a schematic structural diagram of a driving protection circuit for an initiator provided by an embodiment of the present invention;

[0046] Figure 2 It is a schematic structural diagram of the protection resistor provided by an embodiment of the present invention.

[0047] Reference Signs:

[0048] R1 - turn-on voltage resistor; R2 - voltage-dividing protection resistor; R3 - device current-limiting resistor;

[0049] R4 - charging current-limiting resistor; R5 - discharge protection resistor; S - power-on switch;

[0050] U - power supply; D - diode. Detailed Embodiments

[0051] The following will specifically describe the preferred embodiments of the present invention in conjunction with the drawings. The drawings form a part of this application and are used together with the embodiments of the present invention to explain the principles of the present invention, rather than to limit the scope of the present invention.

[0052] A specific embodiment of the present invention discloses a driving protection circuit for an initiator, as Figure 1 shown. The driving protection circuit includes a power-on protection circuit for the power supply, a capacitor charging protection circuit, and an ignition control protection circuit;

[0053] The power-on protection circuit is connected to the power supply, and is used to provide power-on protection when the power supply is powered on and provide charging energy for the capacitor charging protection circuit;

[0054] The capacitor charging protection circuit is used to receive the charging energy of the power-on protection circuit under the control of the charging control signal and charge the internal energy storage capacitor;

[0055] The ignition control protection circuit is used to release the energy of the energy storage capacitor under the control of the ignition control signal to detonate the pyrotechnic load.

[0056] Specifically, as Figure 1 shown, when the power supply is powered on, the entire drive protection circuit is protected by the power-on protection circuit. At the same time, the power-on protection circuit transmits the received power energy to the lower-level capacitor charging protection circuit to charge the internal energy storage capacitor, and stores the energy for detonating the pyrotechnic device; the capacitor charging protection circuit also receives the charging control signal, and determines whether to charge the energy storage capacitor under the control of the charging control signal, while ensuring the safety of the capacitor charging protection circuit when charging the energy storage capacitor; the ignition control protection circuit receives the ignition control signal, and releases the energy of the energy storage capacitor under the control of the ignition control signal to facilitate the safe detonation of the pyrotechnic device, ensuring the safety of the pyrotechnic device detonation process.

[0057] It should be noted that a drive protection circuit for pyrotechnic devices provided by an embodiment of the present invention greatly improves the safety of pyrotechnic devices during detonation and reduces the threat to personnel through triple protection of the power-on protection circuit, the capacitor charging protection circuit, and the ignition control protection circuit.

[0058] Specifically, when the drive protection circuit is in the sleep state, the entire drive protection circuit is powered off through the power-on protection circuit to ensure that the drive protection circuit is in the sleep state; when the drive protection circuit enters the ignition state, the drive protection circuit is slowly started and powered on through the power-on protection circuit to reduce the voltage spike generated when the power supply is powered on, and at the same time monitor the large current in the drive protection circuit to prevent overcurrent short-circuit conditions; subsequently, the capacitor charging protection circuit and the ignition control protection circuit are used to control the detonation state of the pyrotechnic device. When all three protections are turned on, the pyrotechnic device can be detonated normally, and the safety is greatly improved.

[0059] Preferably, the power-on protection circuit includes a protection resistor, a buffer capacitor, an on-voltage resistor R1, a first switching device, a power-on switch S, and a voltage-dividing protection resistor R2;

[0060] One end of the protection resistor is connected to the positive pole of the power supply; the other end of the protection resistor is simultaneously connected to one end of the buffer capacitor, one end of the on-voltage resistor R1, and the source port of the first switching device;

[0061] The drain port of the first switching device is connected to a capacitor charging protection circuit.

[0062] The other end of the buffer capacitor, the other end of the turn-on voltage resistor R1, and the gate port of the first switching device are simultaneously connected to one end of the power-on switch S; the other end of the power-on switch S is connected to one end of the voltage-dividing protection resistor R2, and the other end of the voltage-dividing protection resistor R2 is connected to the negative power supply.

[0063] Specifically, as Figure 2 shown, the power-on switch S controls the sleep state and ignition state of the entire drive protection circuit; when the power-on switch S is disconnected, the voltage-dividing protection circuit R2 and the power supply do not form a loop. At this time, the first switching device is in the off state, so that the entire drive protection circuit cannot receive power energy, and the drive protection circuit cannot form a loop, further causing the subsequent circuit to not receive input energy and being in the sleep state, realizing the protection of the drive protection circuit; when the power-on switch S is turned on, the power-on protection circuit of the power supply forms a loop with the power supply, and the entire drive protection circuit enters the ignition state.

[0064] Preferably, the power-on switch S can be any one of the following:

[0065] Relay;

[0066] Thyristor;

[0067] MOS transistor.

[0068] Specifically, the user controls the power-on switch S manually or by means of a signal, so that the drive protection circuit enters the ignition state or the sleep state.

[0069] Specifically, as Figure 1 shown, at the moment when the power-on switch S is turned on, due to the existence of the buffer capacitor in the power-on protection circuit of the power supply, the turn-on voltage resistor R1 and the first switching device are short-circuited, which can reduce the peak voltage at the moment of power-on and realize the function of slow power-on start. The capacitance value of the buffer capacitor is positively correlated with the buffer protection time and can be reasonably set according to the actual situation.

[0070] When the buffer capacitor is fully charged, the buffer capacitor is in an open circuit state. At this time, the turn-on voltage resistor R1 and the first switching device are in parallel. Since the resistance values of the turn-on voltage resistor R1 and the first switching device are different, the voltage across the turn-on voltage resistor R1 will cause the first switching device to be in the on state, making the power-on protection circuit of the power supply form a path with the subsequent circuit, so that the drive protection circuit realizes slow start-up and avoids the peak voltage generated at the moment of power-on from breaking down the drive protection and accidentally detonating the initiator.

[0071] Specifically, when the current output by the power supply exceeds the allowable value of the protection resistor, the protection resistor fuses, preventing the drive protection circuit from forming a loop and achieving overcurrent protection for the drive protection circuit.

[0072] Preferably, the protection resistor includes a plurality of branches connected in parallel;

[0073] Among them, a bias resistor and a first fuse resistor are connected in series on one branch, and a second fuse resistor is provided on the remaining branches;

[0074] Among them, the resistance values of the first fuse resistor and the second fuse resistor are the same.

[0075] Specifically, as Figure 2 shown, through the protection resistor, when the current output by the power supply is greater than the allowable value of the protection resistor, the branch with the series-connected bias resistor and the first fuse resistor has a smaller resistance difference from the other branches, and any branch in the other branches will be preferentially fused, so that the branch with the series-connected bias resistor and the first fuse resistor is protected. When the drive protection circuit checks for faults, the overcurrent protection function can still be used.

[0076] Preferably, the power-on protection circuit of the power supply further includes a device current-limiting resistor R3;

[0077] One end of the device current-limiting resistor R3 is connected to the gate port of the first switching device;

[0078] The other end of the device current-limiting resistor R3 is connected to one end of the power-on switch S, the other end of the buffer capacitor, and the other end of the turn-on voltage resistor R1.

[0079] Specifically, as Figure 1 shown, the first switching device includes a source port, a gate port, and a drain port, and the device current-limiting resistor R3 is installed between the gate port of the first switching device and the power-on switch S.

[0080] It should be noted that when the buffer capacitor is fully charged, considering that the voltage divided by the turn-on voltage resistor R1 is much greater than the turn-on voltage of the first switching device, if only the turn-on voltage resistor R1 and the gate port and source port of the first switching device are connected in parallel at this time, the current flowing through the first switching device may be too large and burn out the first switching device. Connecting a device current-limiting resistor R3 in series in the first switching device can reduce the current flowing through the first switching device and avoid damaging the first switching device.

[0081] Preferably, as Figure 1 shown, the capacitor charging protection circuit includes a second switching device, a diode D, and an energy storage capacitor;

[0082] The source port of the second switching device is connected to the drain port of the first switching device. The gate port of the second switching device is used to receive a charging control signal, and the drain port of the second switching device is connected to the positive electrode of diode D;

[0083] The negative electrode of diode D is simultaneously connected to the other end of the energy storage capacitor and one end of the initiator load;

[0084] The other end of the energy storage capacitor is connected to the negative power supply.

[0085] Specifically, there is an ignition element in the initiator, and its function is to ignite. When the ignition element is energized by external energy, it will emit flame energy or other forms of energy and transmit it to detonate the initiator.

[0086] Specifically, as Figure 1 shown, the initiator is detonated by discharging the energy storage capacitor. Discharging the energy storage capacitor can provide enough energy and reduce the detonation time at the same time.

[0087] Specifically, when the power-on switch S is turned on, the first switching device will be turned on. After that, when the capacitor charging protection circuit receives a charging control signal, the energy storage capacitor will be charged; under the action of the charging control signal, the second switching device is turned on. During the period when the second switching device is turned on, the power supply charges the energy storage capacitor. At this time, the ignition control protection circuit is in a short-circuited state, and at the same time, the turn-on voltage resistor R1, the power-on switch S, and the voltage-dividing protection resistor R2 in the power supply power-on protection circuit will also be short-circuited; when the energy storage capacitor is fully charged, the energy storage capacitor is in an open-circuit state. At this time, the ignition control protection circuit is turned on, and the turn-on voltage resistor R1, the power-on switch S, and the voltage-dividing protection resistor R2 in the power supply power-on protection circuit are turned on.

[0088] Specifically, when charging the energy storage capacitor, the energy stored in the energy storage capacitor when it is fully charged is W C :

[0089]

[0090] where C is the capacitance value of the energy storage capacitor, in μF; U OUT is the power supply voltage, in V.

[0091] Specifically, according to the required energy W C stored in the energy storage capacitor and the power supply voltage, the capacitance value required for the energy storage capacitor can be determined.

[0092] Specifically, when the energy storage capacitor discharges, setting diode D in the capacitor charging protection circuit can prevent the generated reverse voltage from flowing back into the power supply power-on protection circuit, improve the safety of detonation, and prevent accidental detonation of the initiator.

[0093] Preferably, the capacitor charging protection circuit further includes a charging current limiting resistor R4;

[0094] One end of the charging current limiting resistor R4 is connected to the negative electrode of the diode D;

[0095] The other end of the charging current limiting resistor R4 is simultaneously connected to the other end of the energy storage capacitor and one end of the initiator load.

[0096] Specifically, when the capacitor charging protection circuit is turned on, the charging voltage of the energy storage capacitor can be adjusted by the set charging current limiting resistor R4, and the charging power of the energy storage capacitor can be controlled by controlling the resistance value of the charging current limiting resistor R4, preventing the protection resistor from melting due to excessive power.

[0097] Preferably, the ignition control protection circuit includes a third switching device and a discharge protection resistor R5;

[0098] The drain port of the third switching device and one end of the discharge protection resistor R5 are both connected to the other end of the initiator load;

[0099] The gate port of the third switching device is used to receive an ignition control signal;

[0100] The source port of the third switching device and the other end of the discharge protection resistor R5 are both connected to the negative power supply terminal.

[0101] Preferably, the resistance value of the discharge protection resistor R5 is much larger than the internal resistance of the initiator load and the on-resistance of the third switching device.

[0102] Specifically, as Figure 1 shown, when the third switching device is in the off state under the control of the ignition control signal, the initiator load and the discharge protection resistor R5 form a loop, the voltage across the energy storage capacitor remains approximately unchanged, the voltage across the initiator load is approximately zero, and the initiator cannot be detonated; when the third switching device is in the on state under the control of the ignition control signal, since the on-resistance of the third switching device is much lower than that of the discharge protection resistor R5, the discharge protection resistor R5 is short-circuited. At this time, the initiator load and the third switching device are equivalent to a wire, and the two ends of the energy storage capacitor are equivalent to a short circuit. The energy storage capacitor starts to discharge. At the same time, due to the presence of the diode D, the current can only pass through the initiator load circuit, and the initiator is detonated by the instantaneous large current.

[0103] It should be noted that the electrostatic accumulation effect will gradually increase the charge amount of the energy storage capacitor, which is equivalent to charging the energy storage capacitor. The discharge protection resistor R5 is equivalent to a load. When the energy storage capacitor is open-circuited and the ignition control signal is not turned on, the energy stored in the energy storage capacitor will be slowly released through the discharge protection resistor R5, which can effectively prevent the long-term accumulation of charges from damaging the energy storage capacitor or accidentally detonating the initiator.

[0104] Specifically, the third switching device and the discharging protection resistor R5 together form an ignition control protection circuit. When the third switching device is off, there will be no large current impact passing through the initiator load, thus protecting the initiator from accidental detonation. When the third switching device is on, the detonation of the initiator is completed.

[0105] Preferably, the first switching device and the second switching device have the same structure, both including a plurality of P-type MOS transistors connected in sequence; the third switching device includes a plurality of N-type MOS transistors connected in sequence;

[0106] The source electrode of the first MOS transistor serves as the source terminal port, the drain electrode of the last MOS transistor serves as the drain terminal port, the source electrode of the latter MOS transistor is connected to the drain electrode of the former MOS transistor, and the gate electrodes of all MOS transistors are connected and serve as the gate terminal port.

[0107] Specifically, as Figure 1 shown, the first switching device, the second switching device, and the third switching device all include a source terminal port, a drain terminal port, and a gate terminal port. The left side of the first switching device and the second switching device is the source terminal port, the right side is the drain terminal port, and the lower side is the gate terminal port. The upper side of the third switching device is the drain terminal port, the lower side is the source terminal port, and the left side is the gate terminal port.

[0108] Specifically, the first switching device, the second switching device, and the third switching device are all composed of a plurality of MOS transistors connected in series, which can effectively enhance safety and prevent short circuits in the first switching device, the second switching device, and the third switching device.

[0109] Preferably, the buffer capacitor and the energy storage capacitor have the same structure, both including a plurality of capacitors connected in parallel.

[0110] Specifically, the energy storage capacitor can increase the stored energy value by connecting two or more capacitors in parallel.

[0111] Specifically, the buffer capacitor can extend the power-on buffering time by connecting two or more capacitors in parallel.

[0112] It should be noted that the power-on switch S, the charging control signal, and the ignition control signal adopt three independent control methods. Only when the power-on switch is on, the charging control signal is yes, and the ignition control signal is yes, will the initiator load be detonated.

[0113] Specifically, when the power-on switch S is off, the entire drive protection circuit cannot form a loop and is in a sleep state, unable to detonate the pyrotechnic device. When the power-on switch S is on and the charge control signal and the ignition control signal are both off, soft start is performed through the buffer capacitor to prevent the voltage peak at the moment of power-on from causing accidental detonation of the pyrotechnic load. When the power-on switch S is on and the buffer capacitor is fully charged, if the charge control signal is on at this time, both the first switching device and the second switching device are in the on state, and charging of the energy storage capacitor begins. When the energy storage capacitor is fully charged, it remains in the off state. At this time, it can be determined whether to detonate the pyrotechnic load according to the ignition control signal.

[0114] Compared with the prior art, the drive protection circuit for pyrotechnic devices provided by the embodiment of the present invention has triple protection through the power-on protection circuit, the capacitor charging protection circuit, and the ignition control protection circuit, greatly improving the safety of pyrotechnic devices during detonation and reducing the threat to personnel. At the same time, the buffer capacitor in the power-on protection circuit reduces the voltage peak at the moment of power-on, enabling the drive protection circuit to start up slowly. At the same time, the overcurrent protection function is realized through the protection resistor, ensuring that the capacitor charging protection circuit and the ignition control protection circuit connected at the rear stage cannot draw power from the power supply when not working and reducing damage to the rear-stage circuit caused by the peak voltage at the moment of power-on, ensuring power-on safety. In addition, the diode in the capacitor charging protection circuit prevents the energy storage capacitor from discharging back into the power-on protection circuit when discharging, and the charging current-limiting resistor adjusts the power during the charging of the energy storage capacitor, preventing the energy storage capacitor from entering the charging state in the standby state, ensuring charging safety. The discharge protection resistor in the ignition control protection circuit also prevents the energy storage capacitor from detonating the pyrotechnic device during accidental discharge, improving the safety of the detonation process.

[0115] Those skilled in the art can understand that all or part of the processes for implementing the methods of the above embodiments can be completed by instructing relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. Among them, the computer-readable storage medium is a magnetic disk, an optical disk, a read-only memory, or a random access memory, etc.

[0116] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A driving protection circuit for explosive devices, characterized in that: The driving protection circuit includes a power supply power-on protection circuit, a capacitor charging protection circuit and an ignition control protection circuit; The power supply power-on protection circuit is connected to the power supply, and is used to provide power-on protection when the power supply is powered on and to provide charging energy for the capacitor charging protection circuit; The capacitor charging protection circuit is used to receive the charging energy of the power supply power-on protection circuit under the control of the charging control signal and charge the internal energy storage capacitor; The ignition control protection circuit is used to release the energy of the energy storage capacitor to ignite the pyrotechnic load under the control of the ignition control signal.

2. The driving protection circuit according to claim 1, characterized in that: The power supply power-on protection circuit includes a protection resistor, a buffer capacitor, a start voltage resistor R1, a first switch type device, a power-on switch S and a voltage divider protection resistor R2; One end of the protection resistor is connected to the positive electrode of the power supply; the other end of the protection resistor is simultaneously connected to one end of the buffer capacitor, one end of the turn-on voltage resistor R1 and the source port of the first switch type device; The drain port of the first switch type device is connected to a capacitor charging protection circuit, The other end of the buffer capacitor, the other end of the turn-on voltage resistor R1 and the gate port of the first switch type device are connected to one end of the power-on switch S at the same time; the other end of the power-on switch S is connected to one end of the voltage divider protection resistor R2, and the other end of the voltage divider protection resistor R2 is connected to the negative electrode of the power supply.

3. The driving protection circuit according to claim 2, characterized in that: The power supply power-on protection circuit also includes a device current limiting resistor R3; One end of the device current limiting resistor R3 is connected to the gate port of the first switch type device; The other end of the device current limiting resistor R3 is connected to one end of the power-on switch S, the other end of the buffer capacitor and the other end of the turn-on voltage resistor R1.

4. The driving protection circuit according to claim 2, characterized in that: The protective resistor includes a plurality of branches connected in parallel with each other; Among them, one branch is provided with a bias resistor and a first fuse resistor connected in series, and the other branches are provided with a second fuse resistor; The resistance value of the first fuse resistor is the same as the resistance value of the second fuse resistor.

5. The driving protection circuit according to claim 2, characterized in that: The power-on switch S can be any of the following: Relay; Thyristor; MOS tube.

6. The driving protection circuit according to claim 2, characterized in that: The capacitor charging protection circuit includes a second switch type device, a diode D and an energy storage capacitor; The source port of the second switch type device is connected to the drain port of the first switch type device, the gate port of the second switch type device is used to receive the charging control signal, and the drain port of the second switch type device is connected to the positive electrode of the diode D; The cathode of diode D is connected to the other end of the energy storage capacitor and one end of the pyrotechnic load at the same time; The other end of the energy storage capacitor is connected to the negative electrode of the power supply.

7. The driving protection circuit according to claim 6, characterized in that: The capacitor charging protection circuit also includes a charging current limiting resistor R4; One end of the charging current limiting resistor R4 is connected to the cathode of the diode D; The other end of the charging current limiting resistor R4 is connected to the other end of the energy storage capacitor and one end of the pyrotechnic load.

8. The driving protection circuit according to claim 6, characterized in that: The ignition control protection circuit includes a third switch type device and a discharge protection resistor R5; The drain port of the third switch type device and one end of the discharge protection resistor R5 are both connected to the other end of the pyrotechnic load; The gate port of the third switch type device is used to receive an ignition control signal; The source terminal of the third switch type device and the other end of the discharge protection resistor R5 are both connected to the negative electrode of the power supply.

9. The driving protection circuit according to claim 8, characterized in that: The first switch type device and the second switch type device have the same structure, both comprising a plurality of P-type MOS transistors connected in sequence; the third switch type device comprises a plurality of N-type MOS transistors connected in sequence; The source of the first MOS tube serves as the source port, the drain of the last MOS tube serves as the drain port, the source of the next MOS tube is connected to the drain of the previous MOS tube, and the gates of all MOS tubes are connected and serve as gate ports.

10. The driving protection circuit according to claim 6, characterized in that: The buffer capacitor and the energy storage capacitor have the same structure, both comprising a plurality of capacitors connected in parallel.

Images