Voltage-controllable initiating explosive device ignition circuit

Abstract

The invention provides an initiating explosive device ignition circuit with controllable voltage. The initiating explosive device ignition circuit comprises a main control module, a voltage control module, a DAC control circuit, a resistor voltage and current detection module, an ADC detection circuit, a relay MOS control module, an IO control circuit, a power module and a battery. The voltage control module comprises a DC-DC chip and an isolation operational amplifier, and DC-DC output voltage regulation is carried out by controlling feedback voltage through DAC output of the main control module; the two P-MOS protection circuits are connected in series, conduction of the MOS is controlled through double IO signals, it is ensured that an ignition channel is not short-circuited when a single MOS is damaged, meanwhile, the double-MOS protection circuit is located at the front stage of the relay, the influence of reverse electromotive force generated when the relay is closed on a front-stage control circuit can be effectively isolated, and signal false triggering caused by the reverse electromotive force can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of explosive devices, and in particular relates to an ignition circuit for explosive devices with controllable voltage. Background Art

[0002] With the rapid development of aerospace, national defense science and technology, and civil blasting technology, higher requirements are placed on the precise control, safety performance, and environmental adaptability of pyrotechnic ignition devices.

[0003] Traditional pyrotechnic ignition circuits use simple and reliable circuit designs to ensure basic ignition functions. However, this technology does not consider the impact of environmental factors on the resistance of pyrotechnics, and the ignition success rate decreases under complex conditions. Traditional pyrotechnic ignition systems generally have the following problems:

[0004] Limited control accuracy: Early ignition systems often rely on fixed voltage or current drive, and it is difficult to dynamically adjust ignition parameters according to the specific state of the pyrotechnic product (such as changes in resistance), which affects the success rate and stability of ignition.

[0005] Insufficient safety considerations: Lack of effective real-time monitoring and protection mechanisms, susceptible to external interference or internal failures leading to misoperation, posing a threat to the safety of personnel and equipment.

[0006] Inconvenient maintenance and upgrade: Most traditional devices have complex structures and high coupling between modules, which makes them inconvenient to repair and difficult to upgrade technology, increasing long-term operating costs.

[0007] In view of the above technical limitations, it is an urgent need to design a new type of ignition device for explosives that integrates resistance detection, voltage control, and current detection. Summary of the invention

[0008] In order to overcome the deficiencies in the prior art, the present invention provides an ignition circuit for explosive devices that integrates resistance detection, voltage control, and current detection.

[0009] The technical solution adopted by the present invention to solve the technical problem is: a voltage-controllable ignition circuit for explosives, comprising a main control module, a voltage control module, a DAC control circuit, a resistor voltage and current detection module, an ADC detection circuit, a relay MOS control module, an IO control circuit, a power module, and a battery;

[0010] The voltage control module includes a DC-DC chip and an isolation amplifier, and controls the feedback voltage through the output of the main control module DAC to adjust the DC-DC output voltage;

[0011] The resistance voltage current detection module includes an isolation operational amplifier and a Hall sensor. The ignition current is detected by a differential operational amplifier circuit and a Hall sensor, and the resistance value of the pyrotechnic device is detected by a constant current source operational amplifier current.

[0012] The relay MOS control module includes a relay and a P-MOS. The P-MOS is connected in series to form a protection circuit to prevent the signal from being sent by mistake. The relay closes the ignition channel to realize current release.

[0013] It is further configured as follows: the main control module is based on a single chip microcomputer and is used for ADC detection circuit input, DAC control circuit output, and IO control circuit control.

[0014] It is further configured as follows: the main control module adopts an STM32F103VCT6 single-chip microcomputer, and the main control module transmits and controls signals to each secondary circuit through an ADC detection circuit and a DAC control circuit.

[0015] Further settings are: the power supply selects the URB4812YMD-30WR3 power module, which has wide voltage range input and high power output characteristics and is used to supply power to the main control module.

[0016] It is further configured as follows: the DAC control circuit includes three isolated operational amplifiers LM2904DR, and the DAC output is controlled through a voltage follower circuit and a proportional amplifier circuit, and the output voltage and output current limit value of the DC-DC power supply circuit are controlled.

[0017] It is further configured as follows: the ADC detection circuit includes an isolation amplifier LM2904DR and a Hall sensor CC6920SO-20A.

[0018] It is further configured as follows: the IO control circuit includes a P-MOS, a relay, and a diode. For the relay control, the drain of the P-MOS is connected to the relay coil pin 1, the source of the P-MOS is connected to the 12V power supply, and the relay coil pin 2 is grounded.

[0019] It is further configured as follows: the voltage control module uses the ISL81601FRZ power chip as the control core, and includes a power MOS tube, a reference chip, and an operational amplifier.

[0020] Further settings are: voltage input range 0-60V, output range 0-60V, output current range 0-20A.

[0021] The beneficial effects of the present invention are as follows: the DAC control circuit includes three isolated operational amplifiers LM2904DR, and the DAC output is controlled by a voltage follower circuit and a proportional amplifier circuit, and the output voltage and output current limit value of the DC-DC power supply circuit are controlled to achieve the adjustment of the ignition voltage;

[0022] Two P-MOS are connected in series, and the MOS conduction is controlled by dual IO signals to ensure that the ignition channel is not short-circuited when a single MOS is damaged. At the same time, the dual MOS protection circuit is located in the front stage of the relay, which can effectively isolate the influence of the reverse electromotive force generated when the relay is closed on the front stage control circuit, and can reduce the signal false triggering caused by the reverse electromotive force;

[0023] The voltage control circuit uses the ISL81601FRZ power chip as the control core, including power MOS tubes, reference chips, operational amplifiers, etc. to realize the control of ignition voltage. The voltage input range is 0-60V, the output range is 0-60V, and the output current range is 0-20A, which can meet the ignition current requirements of different sizes and greatly improve the applicability to ignition scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a block diagram of an ignition circuit in the present invention;

[0025] Figure 2 It is a voltage detection circuit diagram of the present invention;

[0026] Figure 3 is a current detection circuit diagram of the present invention;

[0027] Figure 4 It is the circuit diagram of constant current source amplifier in the present invention;

[0028] Figure 5 This is a dual MOS protection circuit diagram of the present invention; DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-5 The present invention provides a technical solution: a voltage-controllable ignition circuit for explosives, comprising:

[0031] Main control module, voltage control module, DAC control circuit, resistor voltage and current detection module, ADC detection circuit, relay MOS control module, IO control circuit, power module, battery;

[0032] The main control circuit uses the STM32F103VCT6 single-chip computer, and transmits and controls the signals of each secondary circuit through the DAC control circuit, ADC detection circuit, and GPIO interface, involving 3 groups of ADC, 3 groups of DAC, and 10 groups of GPIO. For the three groups of ADC interfaces, the first group of ADC interfaces is connected to the constant current op amp circuit for the acquisition of the resistance signal of the pyrotechnics, the second group of ADC interfaces is connected to the differential op amp circuit for the acquisition of the ignition voltage signal, and the third group is connected to the Hall sensor for the acquisition of the ignition current signal; for the three groups of DAC interfaces, the first group is connected to the voltage follower for controlling the ignition voltage, and the second group is connected to the proportional amplifier circuit for the setting of the ignition current limit value; the 10 groups of GPIO interfaces are used to connect each MOS tube for relay closure control and ignition channel protection.

[0033] The power supply circuit selects the URB4812YMD-30WR3 power module, which has wide voltage range input and high power output characteristics and is used to supply power to the main control module.

[0034] The DAC control circuit includes three isolated operational amplifiers LM2904DR, which control the DAC output through a voltage follower circuit and a proportional amplifier circuit, control the output voltage and output current limit value of the DC-DC power supply circuit, and realize the adjustment of the ignition voltage.

[0035] The ADC detection circuit includes the isolation amplifier LM2904DR and the Hall sensor CC6920SO-20A, which can realize the signal collection and detection of the resistance value, ignition voltage and ignition current of the pyrotechnics. The differential amplifier circuit is used to reduce the multiple of the ADC collection voltage, such as Figure 2 As shown, the ignition voltage is directly input to the differential amplifier circuit to collect the ignition voltage value; Figure 3 As shown, the current detection circuit can detect the ignition current value in the range of 0-20A with an accuracy of 100mV / A through the Hall sensor and then connected to the differential amplifier circuit.

[0036] like Figure 4 As shown, the constant current source amplifier circuit can detect the resistance value in the range of 0-100Ω with an accuracy of 0.1OΩ through the ADC signal acquisition of the main control module microcontroller;

[0037] The IO control circuit includes P-MOS, relays, and diodes. For the relay control, the drain of the P-MOS is connected to the relay coil pin 1, the source of the P-MOS is connected to the 12V power supply, and the relay coil pin 2 is grounded. The P-MOS is turned on by controlling the gate-source voltage of the P-MOS, and then the relay is controlled to close, realizing the physical conduction of the ignition voltage. For the ignition channel protection, two P-MOS are connected in series (such as Figure 5As shown in the figure, the MOS is turned on by controlling the dual IO signals to ensure that the ignition channel is not short-circuited when a single MOS is damaged. At the same time, the dual MOS protection circuit is located in the front stage of the relay, which can effectively isolate the influence of the reverse electromotive force generated when the relay is closed on the front stage control circuit, and reduce the signal false triggering caused by the reverse electromotive force.

[0038] The voltage control circuit uses the ISL81601FRZ power chip as the control core, including power MOS tubes, reference chips, operational amplifiers, etc. to realize the control of ignition voltage. The voltage input range is 0-60V, the output range is 0-60V, and the output current range is 0-20A, which can meet the ignition current requirements of different sizes and greatly improve the applicability to ignition scenarios.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A voltage-controllable ignition circuit for explosives, comprising a main control module, a voltage control module, a DAC control circuit, a resistor voltage and current detection module, an ADC detection circuit, a relay MOS control module, an IO control circuit, a power module, and a battery; The voltage control module includes a DC-DC chip and an isolation amplifier, and controls the feedback voltage through the output of the main control module DAC to adjust the DC-DC output voltage; The resistance voltage current detection module includes an isolation operational amplifier and a Hall sensor. The ignition current is detected by a differential operational amplifier circuit and a Hall sensor, and the resistance value of the pyrotechnic device is detected by a constant current source operational amplifier current. The relay MOS control module includes a relay and a P-MOS. The P-MOS is connected in series to form a protection circuit to prevent the signal from being sent by mistake. The relay closes the ignition channel to realize current release.

2. A voltage-controllable ignition circuit for explosives according to claim 1, characterized in that: The main control module is based on a single chip microcomputer and is used for ADC detection circuit input, DAC control circuit output, and IO control circuit control.

3. A voltage-controllable ignition circuit for explosives according to claim 2, characterized in that: The main control module adopts the STM32F103VCT6 single chip microcomputer, and the main control module transmits and controls signals to each secondary circuit through the ADC detection circuit and the DAC control circuit.

4. A voltage-controllable ignition circuit for explosives according to claim 1, characterized in that: The power supply is the URB4812YMD-30WR3 power module, which has wide voltage range input and high power output characteristics and is used to supply power to the main control module.

5. The voltage-controllable ignition circuit for explosives according to claim 1, characterized in that: The DAC control circuit includes three isolated operational amplifiers LM2904DR, and performs DAC output control through a voltage follower circuit and a proportional amplifier circuit, and controls the output voltage and output current limit value of the DC-DC power supply circuit.

6. A voltage-controllable ignition circuit for explosives according to claim 1, characterized in that: The ADC detection circuit includes an isolation amplifier LM2904DR and a Hall sensor CC6920SO-20A.

7. A voltage-controllable ignition circuit for explosives according to claim 1, characterized in that: The IO control circuit includes a P-MOS, a relay, and a diode. For the relay control, the drain of the P-MOS is connected to the relay coil pin 1, the source of the P-MOS is connected to the 12V power supply, and the relay coil pin 2 is grounded.

8. The voltage-controllable ignition circuit for explosives according to claim 1, characterized in that: The voltage control module uses the ISL81601FRZ power chip as the control core, and includes a power MOS tube, a reference chip, and an operational amplifier.

9. A voltage-controllable ignition circuit for explosives according to claim 8, characterized in that: Voltage input range 0-60V, output range 0-60V, output current range 0-20A.

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