阅读说明：本技术 一种电流上升斜率可调的单脉冲火工品点火电路 (Single-pulse initiating explosive device ignition circuit with adjustable current rising slope ) 是由 周朋 刘雪峰 刘靖雷 刘海烨 张欢 白先民 于 2019-10-28 设计创作，主要内容包括：本发明一种电流上升斜率可调的单脉冲火工品点火电路,包括：电流斜率控制电路和电流幅值控制电路。电流斜率控制电路的一端连接外部供电电源,另一端连接电流幅值控制电路的一端；电流幅值控制电路的另一端连接外部火工品；电流斜率控制电路接收外部供电电压,通过内部阻容参数调整,控制火工点火母线上电流的上升斜率,并将母线电流传送至电流幅值控制电路；电流幅值控制电路：根据外部输入的基准电压,控制母线电流,使得母线电流的幅值与基准电压的比值为常数K。本发明采用的负反馈控制方式,最终控制电流上升斜率和点火电流幅值大小,使得点火电路能够快速、稳定可靠地提供点火电流,有效满足半导体桥式火工品点火电流需求。(The invention relates to a single-pulse initiating explosive device ignition circuit with adjustable current rising slope, which comprises: a current slope control circuit and a current amplitude control circuit. One end of the current slope control circuit is connected with an external power supply, and the other end of the current slope control circuit is connected with one end of the current amplitude control circuit; the other end of the current amplitude control circuit is connected with an external initiating explosive device; the current slope control circuit receives external power supply voltage, controls the rising slope of current on a firer ignition bus through internal resistance-capacitance parameter adjustment, and transmits the bus current to the current amplitude control circuit; the current amplitude control circuit: and controlling the bus current according to the reference voltage input from the outside, so that the ratio of the amplitude of the bus current to the reference voltage is a constant K. The negative feedback control mode adopted by the invention finally controls the current rising slope and the magnitude of the ignition current amplitude, so that the ignition circuit can quickly, stably and reliably provide the ignition current, and the ignition current requirement of the semiconductor bridge type initiating explosive device is effectively met.)

1. A single pulse initiating explosive device ignition circuit with adjustable current rising slope is characterized by comprising: a current slope control circuit and a current amplitude control circuit;

one end of the current slope control circuit is connected with an external power supply, the other end of the current slope control circuit is connected with one end of the current amplitude control circuit, and the other end of the current amplitude control circuit is connected with an external initiating explosive device;

the current slope control circuit: receiving external power supply voltage, controlling the rising slope of current on a firer ignition bus through internal resistance-capacitance parameter adjustment, and transmitting the bus current to a current amplitude control circuit;

the current amplitude control circuit: and controlling the bus current according to the reference voltage input from the outside, so that the ratio of the amplitude of the bus current to the reference voltage is a constant K.

2. The ignition circuit of single-pulse initiating explosive device with adjustable current rising slope according to claim 1, wherein the current slope control circuit comprises: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a capacitor C1, a PMOS tube Q1 and a control switch S1;

one end of the control switch S1 is connected with an external power supply, the other end of the control switch S1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R2, and the other end of the resistor R2 is grounded; the source electrode of the PMOS tube Q1 is connected with one end of the resistor R1, the grid electrode of the PMOS tube Q1 is connected with one end of the resistor R2, and the drain electrode of the PMOS tube Q1 is connected with one end of the capacitor C1; the drain electrode of the PMOS pipe Q1 is used as an output end and is connected with the current amplitude control circuit; the other end of the capacitor C1 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to one end of the resistor R2.

3. The ignition circuit of single-pulse initiating explosive device with adjustable current rising slope according to claim 2, wherein the current amplitude control circuit comprises: the device comprises a current-limiting resistor R0, a test resistor RT, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor RT, an NMOS tube Q2, a capacitor C2, an operational amplifier D1 and an operational amplifier D2;

the drain electrode of the NMOS tube Q2 is connected with the drain electrode of a PMOS tube Q1 in the current slope control circuit, the source electrode of the NMOS tube Q2 is connected with one end of a current-limiting resistor R0, and the gate electrode of the NMOS tube Q2 is connected with one end of a resistor R4, one end of a resistor R5 and one end of a capacitor C2; the other end of the resistor R4 is grounded, the other end of the current-limiting resistor R0 is connected with one end of an external priming system resistor Rx, the other end of the resistor R5 and the other end of the capacitor C2 are connected with the output end of an operational amplifier D2, the positive input end of the operational amplifier D2 is connected with one end of a resistor R7 and one end of a resistor R6, the other end of the resistor R7 is connected with an external power supply, the other end of the resistor R6 is grounded, and the negative input end of the operational amplifier D2 is connected with the output end of the operational amplifier D1 and the negative input end of the operational amplifier D1; the positive input end of the operational amplifier D1 is connected with the other end of the external priming resistor Rx and one end of the test resistor RT, and the other end of the test resistor RT is grounded.

4. The ignition circuit of single-pulse initiating explosive device with adjustable current rising slope as claimed in claim 3, wherein said operational amplifier D1 and D2 are selected from LM 124.

5. The ignition circuit of single-pulse initiating explosive device according to any one of claims 3 to 4, wherein the resistance value of the test resistor RT is smaller than that of the current limiting resistor R0.

6. The single-pulse initiating explosive device ignition circuit with the adjustable current rising slope according to claim 5, wherein the value of the resistor R4 is 20K ohms.

Technical Field

The invention belongs to the field of spacecraft recovery control, and relates to a single-pulse initiating explosive device ignition circuit with an adjustable current rising slope.

Background

The semiconductor bridge igniter used for the reusable return satellite can only be electrically detonated and cannot be thermally detonated, and a large amount of heat needs to be accumulated in a short time. The traditional ignition circuit is only connected with a current-limiting resistor in series on an ignition path to control the magnitude of ignition current, so that the traditional ignition circuit can be influenced by the voltage of a battery and the number of paths for initiating an initiating explosive device simultaneously, the rising slope of the ignition current and the sudden change of the ignition current in the ignition process cannot be guaranteed, and the reliability of the ignition circuit of the return type satellite semiconductor bridge initiating explosive device cannot be guaranteed.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the single-pulse initiating explosive device ignition circuit with the adjustable current rising slope is provided, and the problems that the existing initiating explosive device ignition circuit cannot meet the condition that an HGD2-01 type igniter has the rising slope of the ignition current larger than a certain value, and the current amplitude is controlled to be in a certain range in an overshoot mode are solved.

The technical scheme of the invention is as follows:

a single-pulse initiating explosive device ignition circuit with adjustable current rising slope comprises: a current slope control circuit and a current amplitude control circuit;

one end of the current slope control circuit is connected with an external power supply, the other end of the current slope control circuit is connected with one end of the current amplitude control circuit, and the other end of the current amplitude control circuit is connected with an external initiating explosive device;

the current slope control circuit: receiving external power supply voltage, controlling the rising slope of current on a firer ignition bus through internal resistance-capacitance parameter adjustment, and transmitting the bus current to a current amplitude control circuit;

the current amplitude control circuit: and controlling the bus current according to the reference voltage input from the outside, so that the ratio of the amplitude of the bus current to the reference voltage is a constant K.

Compared with the prior art, the invention has the following advantages:

1) the invention feeds back the collected voltage on the ignition current path to a PMOS tube Q1, the switch state of the switch is controlled by the feedback voltage and the voltage obtained by voltage division of a divider resistor, the ignition current rising slope is ensured, and different rising slopes are obtained by selecting the resistor-capacitor parameters on a feedback loop;

2) the invention compares the voltage of the URT collected on the ignition current path with the reference voltage input by the operational amplifier D2, the voltage is fed back to the NMOS tube Q2 after being filtered, and the voltage obtained by voltage division of the divider resistor controls the switch state of the switch together, thereby ensuring the ignition current amplitude. The current of the ignition circuit can be changed by changing the value of the reference voltage at the input end of the operational amplifier D2, so that different circuit parameters can be set according to different initiating explosive devices.

Drawings

FIG. 1 is a circuit diagram of a single-pulse initiating explosive device ignition circuit with adjustable current rising slope according to the present invention;

FIG. 2 is a schematic block diagram of an initiating explosive device ignition circuit according to the present invention;

FIG. 3 is a circuit diagram of the current slope control of the present invention;

FIG. 4 is a circuit diagram of the current amplitude control circuit of the present invention.

Detailed Description

The invention is based on a certain type of repeatable return type satellite as background, and the HGD2-01 type igniter adopted by the type is a semiconductor bridge igniter, is a product independently developed by the inventor and is used for replacing an FSJ2-13E igniter produced by 692 factories. The igniter has higher performance, but the requirement on the ignition circuit is also increased, so that not only can enough current be maintained, but also a certain requirement on the rising slope of the current is also met.

The traditional ignition circuit is only to connect a current-limiting resistor in series on an ignition path to control the magnitude of ignition current, but does not control the rising slope of the ignition current, so the ignition requirement of an HGD2-01 type igniter cannot be met. The ignition circuit of the invention adds a negative feedback link on the common ignition circuit, which not only can keep the current rising slope of the ignition circuit at a fixed value, but also can control the magnitude of the ignition current, thereby meeting the performance requirements of semiconductor bridge initiating explosive devices.

The invention relates to a single-pulse initiating explosive device ignition circuit with adjustable current rising slope, which is shown in figures 1 and 2 and comprises: a current slope control circuit and a current amplitude control circuit.

One end of the current slope control circuit is connected with an external power supply, the other end of the current slope control circuit is connected with one end of the current amplitude control circuit, and the other end of the current amplitude control circuit is connected with an external initiating explosive device;

the current slope control circuit: receiving external power supply voltage, controlling the rising slope of current on a firer ignition bus through internal resistance-capacitance parameter adjustment, and transmitting the bus current to a current amplitude control circuit;

the current amplitude control circuit: according to the reference voltage input from the outside, the bus current is controlled, so that the ratio of the amplitude of the bus current to the reference voltage is a constant K, and the aim of outputting the ignition current of the fixed initiating explosive device is fulfilled. After the control switch S1 is closed, the external power supply is connected to the initiating explosive device ignition circuit, and the initiating explosive device ignition circuit is used for initiating the initiating explosive device after controlling the rising slope and the magnitude of the current.

As shown in fig. 3, the current slope control circuit includes: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a capacitor C1, a PMOS tube Q1 and a control switch S1;

one end of the control switch S1 is connected with an external power supply, the other end of the control switch S1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R2, and the other end of the resistor R2 is grounded; the source electrode of the PMOS tube Q1 is connected with one end of the resistor R1, the grid electrode of the PMOS tube Q1 is connected with one end of the resistor R2, and the drain electrode of the PMOS tube Q1 is connected with one end of the capacitor C1; the drain electrode of the PMOS pipe Q1 is used as an output end and is connected with the current amplitude control circuit; the other end of the capacitor C1 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to one end of the resistor R2. The PMOS transistor Q1 is selected such that the continuous drain current of the device is greater than the initiating device firing current. R1 is selected to be larger value, tens or hundreds of K magnitude, thereby reducing energy consumption, and simultaneously satisfying V of PMOS tube Q1 after R1 and R2 partial pressure_GSGreater than its openingAnd starting voltage.

The resistor R1 and the resistor R2 in the current slope control circuit are voltage dividing resistors, the power supply voltage is divided and then connected with the grid electrode of the PMOS tube Q1, the voltage Uc is the output voltage of the drain electrode of the PMOS tube Q1, the Uc is fed back to the grid electrode of the PMOS tube Q1 after passing through the capacitor C1 and the resistor R5, the voltage obtained by voltage division of the resistor R1 and the resistor R2 controls the grid electrode voltage of the PMOS tube Q1, the switching state of the PMOS tube Q1 is controlled, and therefore the rising slope of the ignition current is controlled. The specific process is as follows: at the moment when the switch S1 is closed, the PMOS tube Q1 is in a variable resistance area, the PMOS tube Q1 is turned on, the starting voltage Uc of the PMOS tube Q1 rises, the voltage synchronously rises through a differential circuit formed by the capacitor C1, the grid voltage of the PMOS tube Q1 is further restrained from being rapidly turned on, and the rising speed of the ignition current of the firer is finally controlled by the controlled starting speed of the PMOS tube Q1. The resistor R3 in the circuit enables the current feedback branch circuit to be stable and reliable, prevents self-excitation, has small value and can neglect the influence on the control current rising slope. The current rising slope can be obviously changed by changing the value of the capacitor C1, the current rising slope is reduced when the capacitor C1 increases, and the current rising slope is increased when the capacitor C1 decreases, so that the current rising slope can be effectively controlled. The resistance between the drain electrode and the source electrode of the PMOS tube Q1 is RDS, and the ignition current rise time tau is approximately equal to the capacitance C1 multiplied by the resistance R2 multiplied by the resistance R3 multiplied by the RDS. Let the resistance R₃The resistance RDS between the drain electrode and the source electrode of the PMOS tube Q1 is far smaller than the resistance R2, and tau is approximately equal to the capacitance C1 multiplied by the resistance R2. The rise time of the ignition current can be changed by the values of the capacitor C1 and the resistor R2. R3 in the circuit makes the current feedback branch stable and reliable, prevents the self excitation, and the value is less, can ignore to the influence of control current rising slope.

As shown in fig. 4, the current amplitude control circuit includes: the device comprises a current-limiting resistor R0, a test resistor RT, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor RT, an NMOS tube Q2, a capacitor C2, an operational amplifier D1 and an operational amplifier D2; r0 is a current-limiting resistor whose value is based on the resistance of initiating explosive device and the voltage of power supply of initiating explosive device. The NMOS transistor Q2 is selected such that the continuous drain current of the device is greater than the initiating device firing current.

The drain electrode of the NMOS tube Q2 is connected with the drain electrode of a PMOS tube Q1 in the current slope control circuit, the source electrode of the NMOS tube Q2 is connected with one end of a current-limiting resistor R0, and the gate electrode of the NMOS tube Q2 is connected with one end of a resistor R4, one end of a resistor R5 and one end of a capacitor C2; the other end of the resistor R4 is grounded, the other end of the current-limiting resistor R0 is connected with one end of an external priming system resistor Rx, the other end of the resistor R5 and the other end of the capacitor C2 are connected with the output end of an operational amplifier D2, the positive input end of the operational amplifier D2 is connected with one end of a resistor R7 and one end of a resistor R6, the other end of the resistor R7 is connected with an external power supply, the other end of the resistor R6 is grounded, and the negative input end of the operational amplifier D2 is connected with the output end of the operational amplifier D1 and the negative input end of the operational amplifier D1; the positive input end of the operational amplifier D1 is connected with the other end of the external priming resistor Rx and one end of the test resistor RT, and the other end of the test resistor RT is grounded.

The specific models of the operational amplifier D1 and the operational amplifier D2 are LM 124. The resistance value of the test resistor RT is smaller than that of the current limiting resistor R0. The divided voltage of the resistor R4 is used as the turn-on voltage of the NMOS tube Q2, and the value of the resistor R4 is 20K ohms.

The product of the test resistor RT and the expected ignition current of the initiating explosive device is approximately equal to the voltage of the resistor R6 after voltage division of R6 and R7, and the values of R6 and R7 are required to be as large as possible so as to reduce energy consumption. R5 and C2₂And a differential circuit is formed, the value is small, R5 is in ohm magnitude, and C2 is in muF magnitude.

A resistor R4 in the current amplitude control circuit connects the controlled voltage to the grid of the NMOS tube Q2, the resistor R0 is a current-limiting resistor, and RX is an initiating explosive device. The sampling voltage on the sampling resistor RT connected in the initiating explosive ignition path is connected to the negative end of an operational amplifier D2 after passing through a follower consisting of an operational amplifier D1, the reference voltage obtained by dividing the voltage of the positive end by a resistor R6 and a resistor R7 is compared with the reference voltage by an operational amplifier D2, and then a differential circuit consisting of a resistor R5 and a capacitor C2 is connected, the other end of the differential circuit is connected to the grid of an NMOS tube Q2 and one end of a resistor R4, the other end of the resistor R4 is grounded, the divided voltage on the resistor R4 is used as the grid voltage of an NMOS tube Q2, the switching state of the NMOS tube Q2 is controlled, and therefore the current amplitude on the initiating explosive ignition circuit is adjusted, and the ignition current of the initiating explosive ignition circuit is enabled to be consistent with the.

Before the partial circuit starts to work, the NMOS tube Q2 is disconnected, URT is 0, the voltage difference △ U of the positive end and the negative end of the operational amplifier D2 is the input voltage of the positive end of the operational amplifier D2, at the moment, the operational amplifier D2 is in a saturation region, the output voltage U of the operational amplifier D2 is 2, which is acted on the grid electrode of the NMOS tube Q2 through a differential circuit, the NMOS tube Q2 is opened to a constant current region, the ignition current I is rapidly increased, the URT is increased, △ U is gradually reduced, the operational amplifier D2 is gradually transferred from the saturation region to a linear amplification region, the U operational amplifier D2 is reduced, the NMOS tube Q2 is transferred from a cross current region to a variable resistance region, the ignition current I is reduced, the U △ U is gradually increased, the U operational amplifier D2 is increased, the ignition current I is increased accordingly, finally, the URT is approximately equal to the input positive end voltage of the operational amplifier D2, and the circuit is in a balanced state, I is equal to the resistance I0X RT 6342X (R9 + R8653 and R2, R8653) which can be selected through resistors.

Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.