Gas drive unit control circuit
By designing the gas drive unit control circuit and adopting two-stage relay drive, inverter signal differentiation drive, multi-stage detection and power circuit monitoring, the safety and reliability issues of the gas drive unit control circuit are solved, the avoidance of misoperation and timely handling of abnormal conditions are achieved, and the normal operation of the gas drive unit is ensured.
Patent Information
- Application Number
- CN202510980833.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-16
- Publication Date
- 2025-09-12
AI Technical Summary
The control circuit of the gas drive unit in the prior art lacks safety and reliability, resulting in the inability to effectively monitor and handle erroneous operations and abnormal conditions.
A gas drive unit control circuit was designed, including a relay drive circuit, a path detection circuit, an MCU control circuit, and a chamber retention detection circuit. Through two-stage relay drive, inverter signal differentiation drive, three-stage path detection and chamber retention detection, combined with power supply circuit and communication circuit, the safety and reliability control of the gas drive unit was achieved.
It effectively avoids misoperation, ensures the normal operation of the gas drive unit in various working states, and provides timely feedback on abnormal situations, thereby improving the safety and reliability of the gas drive unit control.
Smart Images
Figure CN120630836A_ABST
Abstract
Description
Technical Field
[0001] The present invention mainly relates to the field of drive circuits, and in particular to a gas drive unit control circuit. Background Art
[0002] With the development of weapon systems, drones are playing an increasingly prominent role on the battlefield. For example, in some special operations, their use has begun to disrupt traditional combat methods and models. Drones are classified into two types: fixed-wing and rotary-wing. Fixed-wing drones require a certain takeoff speed to complete, requiring a gas drive unit to generate a large amount of gas to provide initial propulsion. To ensure the safe ignition of the drive unit, a safe ignition control technology is urgently needed. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to provide a gas drive unit control circuit to solve the problems existing in the prior art and effectively ensure the safety and reliability of the gas drive unit control.
[0004] In order to solve the above technical problems, the present invention provides a gas drive unit control circuit, including a relay drive circuit, a path detection circuit, an MCU control circuit and a chamber retention detection circuit; The relay drive circuit includes a fuse relay and an ignition relay connected in series. The fuse relay is configured to receive the fuse control signal of the MCU control circuit and output a feedback signal. The ignition relay is configured to receive the ignition control signal of the MCU control circuit through the inverter circuit and output the ignition signal to the gas drive unit after receiving the output signal of the fuse relay; the path detection circuit is configured to detect the working state of the relay drive circuit and feed it back to the MCU control circuit; the chamber retention detection circuit is configured to detect the state of the ignition relay before and after ignition and feed it back to the MCU control circuit; the MCU control circuit is configured to receive the working state of each circuit in the gas drive unit control circuit and control the normal operation of the gas drive unit control circuit.
[0005] Furthermore, the negative electrode of the control terminal of the insurance relay is connected to the collector of the transistor Q1, the emitter of the transistor Q1 is connected to the base of the transistor Q1 through the resistor R3, and the base of the transistor Q1 receives the insurance control signal through the resistor R1; the negative electrode of the control terminal of the ignition relay is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is connected to the base of the transistor Q2 through the resistor R4, and the base of the transistor Q2 receives the ignition control signal through the resistor R2.
[0006] Furthermore, the negative electrode of the control terminal of the safety relay is connected to the positive electrode of the diode D2, and the negative electrode of the diode D2 is connected to the positive electrode of the control terminal of the safety relay; the negative electrode of the control terminal of the ignition relay is connected to the positive electrode of the diode D1, and the negative electrode of the diode D1 is connected to the positive electrode of the control terminal of the ignition relay.
[0007] Furthermore, the path detection circuit includes a first detection circuit for detecting a feedback signal, a second detection circuit for detecting an input signal of an ignition relay, and a third detection circuit for detecting an ignition signal output by the ignition relay.
[0008] Furthermore, the first detection circuit, the second detection circuit and the third detection circuit are all follower circuits, which include an operational amplifier, whose negative input terminal inputs the signal to be measured and whose output terminal outputs the detection signal to the MCU control circuit.
[0009] Furthermore, the chamber retention detection circuit includes a MOS transistor Q10, the gate of the MOS transistor Q10 receives the MCU control circuit signal through the resistor R21, the drain of the MOS transistor Q10 is connected to the internal voltage through the resistor R20, the source of the MOS transistor Q10 is connected to the gate of the MOS transistor Q10 through the resistor R24, and the source of the MOS transistor Q10 is simultaneously connected to the ignition relay output end and the MCU control circuit.
[0010] Furthermore, the gas drive unit control circuit also includes a power supply circuit, which includes a power switch circuit, a power conversion circuit and a low-voltage shutdown circuit. The power conversion circuit is configured to provide internal voltage and external voltage to power the gas drive unit control circuit. The power switch circuit is configured to control the switching state of the power conversion circuit. The low-voltage shutdown circuit is configured to detect the working state of the power conversion circuit and stop the power conversion work when the power conversion circuit operates abnormally.
[0011] Furthermore, the power switch circuit includes a MOS transistor Q3. The source of the MOS transistor Q3 is connected to the power conversion circuit and grounded through a resistor R7. The gate of the MOS transistor Q3 is connected to the switch through a resistor R10. The drain of the MOS transistor Q3 is grounded through a reverse diode DR1. A resistor R12 is provided between the drain and gate of the MOS transistor Q3. A forward diode D3 is also provided between the drain and gate of the MOS transistor Q3.
[0012] Furthermore, the low voltage shutdown circuit includes a low voltage dropout regulator U1 and an operational amplifier U2A; the input end of the low voltage dropout regulator U1 is connected to the external power supply, the output end of the low voltage dropout regulator U1 outputs a voltage shutdown control signal to the power conversion circuit, and the output end of the low voltage dropout regulator U1 is connected to the negative input end of the operational amplifier U2A; the positive input end of the operational amplifier U2A is connected to the external power supply, and the output end of the operational amplifier U2A receives the voltage shutdown control signal.
[0013] Furthermore, the gas drive unit control circuit also includes a communication circuit, which is used for the MCU control circuit to exchange information with external devices.
[0014] Compared with the prior art, the present invention has the following beneficial effects: The two-stage relay drive avoids the influence of misoperation. At the same time, the two relays are driven by control signals of different levels through the inverter, further improving the reliability of the drive circuit.
[0015] The three-level path detection circuit is used to monitor the working states of the gas drive unit control circuit before excitation control, when releasing the safety, and during ignition to ensure its normal operation and provide feedback processing for abnormal situations.
[0016] The chamber detection circuit is used to detect whether the gas drive unit is in a short-circuit or open-circuit state before or after ignition, so that the drive work can be completed normally. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The accompanying drawings are included to provide a further understanding of the present invention, are incorporated into and constitute a part of this invention, illustrate embodiments of the present invention, and together with this specification serve to explain the principles of the present invention. In the drawings: Figure 1 1 is a schematic diagram of the principle of the air drive unit control circuit according to one embodiment of the present invention; Figure 2 1 is a schematic diagram of a relay driving circuit according to an embodiment of the present invention; Figure 3 1 is a schematic diagram of a first-stage detection circuit in one embodiment of the present invention; Figure 4 This is a schematic diagram of a chamber retention detection circuit in one embodiment of the present invention; Figure 5 is a schematic diagram of a power switch circuit in one embodiment of the present invention; Figure 6 is a schematic diagram of a low voltage shutdown circuit in one embodiment of the present invention; Figure 7 1 is a schematic diagram of the control flow of the gas drive unit control circuit in one embodiment of the present invention. DETAILED DESCRIPTION
[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments. Obviously, the drawings described below are merely examples or embodiments of the present invention. Those skilled in the art can apply the present invention to other similar scenarios based on these drawings without inventive effort. Unless otherwise apparent from the context or otherwise noted, the same reference numerals in the figures represent the same structure or operation.
[0019] It should be understood that when a component is referred to as being “on another component,” “connected to another component,” “coupled to another component,” or “contacting another component,” it can be directly on, connected to, coupled to, or contacting the other component, or intervening components may be present. In contrast, when a component is referred to as being “directly on another component,” “directly connected to,” “directly coupled to,” or “directly contacting” another component, there are no intervening components. Similarly, when a first component is referred to as being “electrically in contact with” or “electrically coupled to” a second component, an electrical path exists between the first and second components that allows current to flow. This electrical path may include capacitors, coupled inductors, and / or other components that allow current to flow, even without direct contact between the conductive components.
[0020] refer to Figure 1 As shown, the gas drive unit control circuit of this embodiment includes a relay drive circuit, a path detection circuit, an MCU control circuit, and a chamber retention detection circuit. The relay drive circuit includes a safety relay and an ignition relay connected in series. The safety relay is configured to receive a safety control signal from the MCU control circuit and output a feedback signal. The ignition relay is configured to receive an ignition control signal from the MCU control circuit through an inverter circuit and output an ignition signal to the gas drive unit after receiving the output signal of the safety relay. The path detection circuit is configured to detect the working state of the relay drive circuit and feed it back to the MCU control circuit. The chamber retention detection circuit is configured to detect the state of the ignition relay before and after ignition and feed it back to the MCU control circuit. The MCU control circuit is configured to receive the working state of each circuit in the gas drive unit control circuit and control the normal operation of the gas drive unit control circuit.
[0021] refer to Figure 2As shown, the negative control terminal of the fuse relay is connected to the collector of transistor Q1, and the emitter of transistor Q1 is connected to the base of transistor Q1 via resistor R3. The base of transistor Q1 receives the fuse control signal through resistor R1. The negative control terminal of the ignition relay is connected to the collector of transistor Q2, and the emitter of transistor Q2 is connected to the base of transistor Q2 via resistor R4. The base of transistor Q2 receives the ignition control signal through resistor R2. The negative control terminals of fuse relay KF2 and ignition relay KF1 are also grounded via capacitors C4 and C3, respectively, to ensure operating voltage stability. When not in operation, pin 9 of the ignition relay KF1 output terminal is short-circuited to ground, short-circuiting the two ends of the gas drive unit ignition line, achieving an anti-static effect and ensuring safety. Transistor Q1 of fuse relay KF2 conducts upon receiving the fuse control signal, creating a voltage difference across the terminals of fuse relay KF2. This conducts, disconnecting pins 3 and 6 from pins 2 and 7 and connecting them to pins 4 and 5. This allows the ignition voltage to pass through and be output to ignition relay KF1 via pin 9. Simultaneously, pin 8 outputs a feedback signal to pin 5. Ignition relay KF1 is driven by the ignition control signal, but an inverter circuit is connected to its driver terminal, creating a voltage difference between the fuse control signal and the ignition control signal, enhancing its ability to prevent misoperation. Furthermore, the cathode of the fuse relay's control terminal is connected to the anode of diode D2, the cathode of which is connected to the anode of the fuse relay's control terminal. The cathode of the ignition relay's control terminal is connected to the anode of diode D1, the cathode of which is connected to the anode of the ignition relay's control terminal, to suppress the reverse voltage generated when the relay switches.
[0022] In one embodiment, the path detection circuit includes a first detection circuit for detecting a feedback signal, a second detection circuit for detecting an ignition relay input signal, and a third detection circuit for detecting an ignition signal output by the ignition relay. The first detection circuit, the second detection circuit, and the third detection circuit are all follower circuits, each of which includes an operational amplifier. The negative input terminal of the operational amplifier inputs the signal to be tested, and the output terminal outputs a detection signal to the MCU control circuit. Figure 3 As shown, the first-stage detection circuit specifically includes an operational amplifier U6D, whose output terminal outputs a detection signal to the MCU control circuit. Its negative input terminal is connected to its output terminal, and its positive input terminal is grounded via resistor R28 and capacitor C11, respectively. Its positive input terminal collects the detection feedback signal via resistor R24. The second-stage detection circuit and the third-stage detection circuit can adopt the same design and will not be repeated here.
[0023] refer to Figure 4As shown, the chamber retention detection circuit may include a MOS transistor Q10. The gate of MOS transistor Q10 receives a signal from the MCU control circuit via resistor R21. The drain of MOS transistor Q10 is connected to an internal 3.3V voltage via resistor R20. The source of MOS transistor Q10 is connected to the gate of MOS transistor Q10 via resistor R24. The source of MOS transistor Q10 is also connected to the ignition relay output and the MCU control circuit. When the gate of MOS transistor Q10 receives a signal, it turns on, and the internal 3.3V voltage passes through resistor R20 and MOS transistor Q10 to the gas drive unit. When the internal resistance of the gas drive unit is 1Ω, the source voltage of MOS transistor Q10 is less than 0.1V, indicating that the gas drive unit is in standby mode or that the gas drive unit is not firing properly. When the gas drive unit is abnormal, that is, the internal resistance is open, the source voltage of MOS transistor Q10 is less than 3.2V, indicating that the gas drive unit is not present or that the firing has been completed. At the same time, through the current limiting of R20, R21, and R24, the current reaching the gas drive unit does not exceed 1mA, and the MOS switch tube responds quickly, so the current passing through the gas drive unit does not exceed 100us, ensuring the safety of the circuit.
[0024] In one embodiment, the gas drive unit control circuit also includes a power supply circuit, which includes a power switch circuit, a power conversion circuit and a low-voltage shutdown circuit. The power conversion circuit is configured to provide an internal voltage of 3.3V and an external voltage of 5V to power the gas drive unit control circuit. The power switch circuit is configured to control the switching state of the power conversion circuit. The low-voltage shutdown circuit is configured to detect the working state of the power conversion circuit and stop the power conversion operation when the power conversion circuit operates abnormally.
[0025] refer to Figure 5 As shown, the power switch circuit includes a MOS transistor Q3. The source of the MOS transistor Q3 is connected to the power conversion circuit and grounded through a resistor R7. The gate of the MOS transistor Q3 is connected to the switch through a resistor R10. The drain of the MOS transistor Q3 is grounded through a reverse diode DR1. A resistor R12 is provided between the drain and gate of the MOS transistor Q3. A forward diode D3 is also provided between the drain and gate of the MOS transistor Q3.
[0026] refer to Figure 6 As shown, the low-voltage shutdown circuit includes a low-dropout voltage regulator U1 and an operational amplifier U2A. The input of the low-dropout voltage regulator U1 is connected to an external voltage, and the output of the low-dropout voltage regulator U1 outputs a voltage shutdown control signal to the power conversion circuit. The output of the low-dropout voltage regulator U1 is connected to the negative input of the operational amplifier U2A. The positive input of the operational amplifier U2A is connected to the external voltage, and the output of the operational amplifier U2A receives the voltage shutdown control signal. If an abnormality in the external voltage VCC is detected, the output voltage shutdown control signal stops the power conversion circuit, ensuring overall circuit safety.
[0027] In one embodiment, the gas drive unit control circuit further includes a communication circuit, which is used for information exchange between the MCU control circuit and external devices, and the communication circuit adopts an RM232 module.
[0028] The overall gas drive unit control circuit is controlled by the MCU control circuit, including status query, release control, and ignition control. It communicates with the main control machine through the communication circuit and communicates with the control software through serial communication or CAN communication to achieve safe ignition.
[0029] Communication content includes query commands, release commands, ignition commands, etc. To achieve reliable and safe control, additional features include data verification (confirming data correctness), abnormal state pause (ignition voltage abnormality will stop ignition and report the status), cycle ignition command confirmation (the ignition command can only be executed after 5-10 cycles), and timeout fuse recovery (if the fuse is released for more than 10 seconds, the fuse state will be automatically restored until the next release command is issued).
[0030] In this embodiment, the query instruction needs to execute the circuit self-test and return the self-test result, the release instruction needs to execute the fuse relay release operation and return the release result, and the ignition instruction needs to determine whether the circuit is in a state where emission is allowed before executing the ignition emission operation. Otherwise, the ignition emission instruction will not be executed. Figure 7 shown.
[0031] The gas drive unit control circuit of this embodiment can effectively ensure the safety and reliability of the gas drive unit control. Specifically, through the two-stage relay drive, the influence of misoperation is avoided. At the same time, the two relays are driven by control signals of different levels through the inverter, further improving the reliability of the drive circuit. The three-stage path detection circuit monitors the working states of the gas drive unit control circuit before excitation control, when releasing the safety, and during ignition to ensure its normal operation and provide feedback processing for abnormal situations. The chamber detection circuit is used to detect whether the gas drive unit is in a short-circuit or open-circuit state before or after ignition, so that the driving work is completed normally.
[0032] For those skilled in the art, the above disclosure is provided for illustrative purposes only and does not constitute a limitation of the present invention. Although not expressly provided herein, those skilled in the art may make various modifications, improvements, and revisions to the present invention. Such modifications, improvements, and revisions are suggested in the present invention and remain within the spirit and scope of the exemplary embodiments of the present invention.
[0033] Although the present invention has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present invention, and various equivalent changes or substitutions can be made without departing from the spirit of the present invention. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the essential spirit of the present invention, they will fall within the scope of the claims of the present invention.
Claims
1. A gas drive unit control circuit, characterized in that: include: Relay drive circuit, path detection circuit, MCU control circuit and chamber retention detection circuit; The relay drive circuit includes a safety relay and an ignition relay connected in series, wherein the safety relay is configured to receive a safety control signal from the MCU control circuit and output a feedback signal, and the ignition relay is configured to receive an ignition control signal from the MCU control circuit through an inverter circuit and output an ignition signal after receiving the output signal from the safety relay; The path detection circuit is configured to detect the working state of the relay drive circuit and feed back the detected state to the MCU control circuit; The chamber retention detection circuit is configured to detect the state of the ignition relay before and after ignition and feed back to the MCU control circuit; The MCU control circuit is configured to receive the operating status of each circuit in the gas drive unit control circuit and control the gas drive unit control circuit to operate normally.
2. A gas drive unit control circuit according to claim 1, characterized in that: The negative electrode of the control end of the safety relay is connected to the collector of the transistor Q1, the emitter of the transistor Q1 is connected to the base of the transistor Q1 through the resistor R3, and the base of the transistor Q1 receives the safety control signal through the resistor R1; the negative electrode of the control end of the ignition relay is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is connected to the base of the transistor Q2 through the resistor R4, and the base of the transistor Q2 receives the ignition control signal through the resistor R2.
3. The gas drive unit control circuit according to claim 1, characterized in that: The negative pole of the control end of the safety relay is connected to the positive pole of the diode D2, and the negative pole of the diode D2 is connected to the positive pole of the control end of the safety relay; the negative pole of the control end of the ignition relay is connected to the positive pole of the diode D1, and the negative pole of the diode D1 is connected to the positive pole of the control end of the ignition relay.
4. The gas drive unit control circuit according to claim 1, characterized in that: The path detection circuit includes a first detection circuit for detecting the feedback signal, a second detection circuit for detecting the ignition relay input signal, and a third detection circuit for detecting the ignition signal output by the ignition relay.
5. The gas drive unit control circuit according to claim 4, characterized in that: The first detection circuit, the second detection circuit and the third detection circuit are all follower circuits, and the follower circuit includes an operational amplifier, the negative input terminal of the operational amplifier inputs the signal to be measured, and the output terminal outputs the detection signal to the MCU control circuit.
6. The gas drive unit control circuit according to claim 1, characterized in that: The chamber retention detection circuit includes a MOS transistor Q10. The gate of the MOS transistor Q10 receives an MCU control circuit signal through a resistor R21. The drain of the MOS transistor Q10 is connected to an internal voltage through a resistor R20. The source of the MOS transistor Q10 is connected to the gate of the MOS transistor Q10 through a resistor R24. The source of the MOS transistor Q10 is also connected to the ignition relay output terminal and the MCU control circuit.
7. The gas drive unit control circuit according to claim 1, characterized in that: It also includes a power supply circuit, which includes a power switching circuit, a power conversion circuit and a low-voltage shutdown circuit. The power conversion circuit is configured to provide internal voltage and external voltage to power the gas drive unit control circuit. The power switching circuit is configured to control the switching state of the power conversion circuit. The low-voltage shutdown circuit is configured to detect the working state of the power conversion circuit and stop the power conversion work when the power conversion circuit operates abnormally.
8. The gas drive unit control circuit according to claim 7, characterized in that: The power switch circuit includes a MOS transistor Q3. The source of the MOS transistor Q3 is connected to the power conversion circuit and grounded through a resistor R7. The gate of the MOS transistor Q3 is connected to the switch through a resistor R10. The drain of the MOS transistor Q3 is grounded through a reverse diode DR1. A resistor R12 is provided between the drain and gate of the MOS transistor Q3. A forward diode D3 is also provided between the drain and gate of the MOS transistor Q3.
9. The gas drive unit control circuit according to claim 7, characterized in that: The low-voltage shutdown circuit includes a low-voltage dropout regulator U1 and an operational amplifier U2A; the input end of the low-voltage dropout regulator U1 is connected to an external power supply, the output end of the low-voltage dropout regulator U1 outputs a voltage shutdown control signal to the power conversion circuit, and the output end of the low-voltage dropout regulator U1 is connected to the negative input end of the operational amplifier U2A; the positive input end of the operational amplifier U2A is connected to the external power supply, and the output end of the operational amplifier U2A receives the voltage shutdown control signal.
10. The gas drive unit control circuit according to any one of claims 1 to 9, characterized in that: It also includes a communication circuit, which is used for the MCU control circuit to exchange information with external devices.