State monitoring and warning device and method for driving power supply of aerospace laser system
By designing a status monitoring and alarm device in the aerospace laser system driving power supply, and using analog devices and D flip-flops to achieve fault monitoring and latch reset, the problems of long response time and expensive in the prior art are solved, and efficient laser protection and low-cost design of the system are realized.
Patent Information
- Application Number
- CN202411816155.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-03-14
AI Technical Summary
The existing laser system driver circuits have a long response time and are expensive in aerospace applications, making it difficult to meet the time requirements for laser failure removal.
A state monitoring and alarm device for driving power supply of aerospace laser system is designed, and the overcurrent and overtemperature faults are monitored using analog devices, and the latch and reset functions are realized using D flip-flops to control the output of the drive power supply.
It realizes timely identification and response to laser faults, avoids laser damage, simplifies system design, reduces costs, and is suitable for the aerospace field.
Smart Images
Figure CN119619901A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of aerospace laser system driving power supply, and in particular to a state monitoring and alarming device and method for aerospace laser system driving power supply. Background Art
[0002] Traditional electromagnetic radars have poor anti-interference, low resolution, and short detection distance. In comparison, the new generation of laser radars has significant advantages and can be widely used in angle measurement, ranging, imaging, navigation, environmental perception and other fields. The core component of laser radar is the laser. One of the necessary conditions for laser generation is external excitation. The laser power supply injects current into the laser to generate laser. Fiber lasers are current-driven devices. The stability and ripple of the input current have a great influence on the output laser power and spectral purity. In severe cases, they may even burn the laser. The laser has a poor ability to withstand current shocks. The driving power supply must be able to effectively suppress current surges, otherwise it is easy to cause the laser performance to degrade or be directly damaged. The laser only utilizes 20% to 40% of the input electrical power, and most of the input power is dissipated in the form of heat. Excessive temperature will burn the laser.
[0003] At present, the status monitoring and alarm circuits of the driving circuits in laser systems are generally implemented based on digital signal processors such as single-chip microcomputers and MCUs, but there are the following problems: First, the detection, calculation, and execution of digital processors require time, generally in the millisecond level, and the response time of this process cannot meet the time requirements for laser fault removal; Second, in aerospace applications, the total irradiation dose and single particle requirements must be met, and digital processors are difficult to select or are expensive, which restricts the application of laser systems in aerospace.
[0004] Therefore, in order to solve the above problems, it is necessary to implement a state monitoring and alarm device for a space laser system driving power supply. Summary of the invention
[0005] The purpose of the present invention is to provide a state monitoring and alarm device and method for a driving power supply of an aerospace laser system. The state monitoring and alarm device and method can solve the deficiencies in the prior art, can implement latching and resetting functions for overcurrent and overtemperature alarm signals of the laser in the laser system, and can control the output of the driving power supply, effectively solving the problems of long response time and high price of such circuits in aerospace applications.
[0006] To achieve the above object, the present invention adopts the following technical solutions: In a first aspect of the present invention, a state monitoring and alarm device for a space laser system driving power supply is disclosed. The device includes a current alarm circuit, a temperature alarm circuit and an alarm signal latch reset control circuit.
[0007] Specifically, the current alarm circuit is used to monitor the output current of the constant current drive of each laser in real time, and to generate an overcurrent alarm signal in time when the current exceeds the specified current limit.
[0008] The temperature alarm circuit is used to monitor the temperature of each laser in real time and generate an over-temperature alarm signal in time when the temperature exceeds the specified operating temperature range.
[0009] The alarm signal latch reset control circuit is used to receive various alarm signals and utilize the rising edge triggering characteristics of the D flip-flop to realize fault latching, resetting, power-on alarm / non-alarm, and switch control.
[0010] Preferably, according to the present invention, the current alarm circuit uses a power resistor to sample an output current signal, uses an operational amplifier to amplify the sampled signal in phase, and then compares the signal with a reference level through a comparator to output a current alarm level.
[0011] The current alarm circuit includes two functional circuits: a common-phase amplifier circuit composed of an operational amplifier U2, a resistor R3, a resistor R4, and a resistor R5, and a level comparison circuit composed of a comparator U3 and a current reference Vrefi; the common-phase input terminal of the operational amplifier U2 is connected to the main power output loop and is also grounded through the resistor R3; the inverting input terminal of the operational amplifier U2 is grounded through the resistor R4, and the inverting input terminal of the operational amplifier U2 is also connected to the output terminal of the operational amplifier U2 through the resistor R5; the output terminal of the operational amplifier U2 is connected to the common-phase input terminal of the comparator U3, the inverting input terminal of the comparator U3 is connected to the current reference Vrefi, and the output terminal of the comparator U3 outputs a current alarm signal.
[0012] Preferably, according to the present invention, the temperature alarm circuit uses a thermistor to sample the laser temperature, converts the temperature information into a voltage signal using a resistor divider, and then compares it with a reference level through a comparator to output a temperature alarm level.
[0013] The temperature alarm circuit includes a voltage-dividing resistor R6, a thermistor R7, a comparator U4 and a comparator U5; the non-inverting input terminal of the comparator U4 is connected to a low-temperature reference signal Vref_tdw, the inverting input terminal of the comparator U4 is connected to a power supply VCC via a voltage-dividing resistor R6, and the inverting input terminal of the comparator U4 is also grounded via a resistor R7; the output terminal of the comparator U4 is connected to an anode of a diode D7; the non-inverting input terminal of the comparator U5 is connected to an inverting input terminal of the comparator U4, and the inverting input terminal of the comparator U5 is connected to a high-temperature reference signal Vref_tgw; the output terminal of the comparator U5 is connected to an anode of a diode D8; the cathode of the diode D7 is connected to a cathode of the diode D8, and then a temperature alarm signal is output.
[0014] Preferably according to the present invention, the alarm signal latch reset control circuit includes a D flip-flop, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and an inverter U1.
[0015] Specifically, the anode of the diode D1 is connected to the output end of the current alarm circuit, and the cathode of the diode D1 is respectively connected to the pin D of the D flip-flop and the anode of the diode D4; the anode of the diode D2 is connected to the output end of the temperature alarm circuit, and the cathode of the diode D2 is respectively connected to the pin D of the D flip-flop and the anode of the diode D4; the anode of the diode D3 is connected to the reset signal, and the cathode is connected to the pin CLK of the D flip-flop; the reset pin of the D flip-flop They are respectively connected to the first end of the resistor R1 and the first end of the capacitor C1; the second end of the resistor R1 is connected to the VCC power supply; the second end of the capacitor C1 is grounded; the pin Q of the D trigger is connected to the positive electrode of the diode D5, the input end of the inverter U1 is connected to the drive output enable signal, the output end is connected to the positive electrode of the diode D6, and the cathode of the diode D6 is connected to the cathode of the diode D5 to serve as the drive output switch control signal.
[0016] Preferably, according to the present invention, each diode D1 to D6 in the alarm signal latch reset control circuit is used for signal isolation.
[0017] Preferably according to the present invention, the inverter U1 is used for enabling signal logic conversion.
[0018] In a second aspect of the present invention, a working method of the above-mentioned state monitoring and alarm device for driving power supply of aerospace laser system is disclosed, and the method comprises the following steps: S1. The current alarm circuit monitors the output current of each laser constant current driver in real time and generates an overcurrent alarm signal in time when the current exceeds the specified limit.
[0019] S2. The temperature alarm circuit monitors the temperature of each laser in real time and generates an over-temperature alarm signal in time when the specified operating temperature range is exceeded.
[0020] S3. The alarm signal latch reset control circuit receives various alarm signals and uses the rising edge triggering characteristics of the D flip-flop to implement fault latching, reset, power-on alarm / non-alarm and switch control.
[0021] Preferably, in step S1, the current alarm circuit monitors the output current of each laser constant current drive in real time, and generates an overcurrent alarm signal in time when the current exceeds the specified current limit, including: The power resistor in the current alarm circuit samples the output current signal, which is amplified by the operational amplifier in phase and then sent to the comparator. The comparator compares the sampled signal with the reference level. When the output current exceeds the specified limit, the comparator outputs a high level and generates an overcurrent alarm signal.
[0022] Preferably, in step S2, the temperature alarm circuit monitors the temperature of each laser in real time and generates an over-temperature alarm signal in time when the temperature exceeds a specified operating temperature range, including: The thermistor in the temperature alarm circuit samples the laser temperature and converts the temperature information into a voltage signal using resistance voltage division. The comparator compares the voltage signal with the reference level. When the temperature exceeds the specified range, the comparator outputs a high level and generates an over-temperature alarm signal.
[0023] Preferably, in step S3, the alarm signal latch reset control circuit receives various alarm signals and uses the rising edge triggering characteristics of the D flip-flop to implement fault latching, resetting, power-on alarm / non-alarm and switch control, including: S31, the reset pin of the D flip-flop realizes power-on reset through resistor R1 and capacitor C1, so that the system is in a non-alarm state when powered on; S32, diodes D1 and D2 send the current alarm signal and temperature alarm signal to the pin D of the D flip-flop respectively, and diode D3 sends the reset signal to the pin CLK of the D flip-flop; when any alarm signal becomes high level, the pin D of the D flip-flop becomes high level, and a fault alarm is issued; S33, after the over-current or over-temperature fault disappears, that is, when any alarm signal becomes low level, the pin D of the D flip-flop returns to low level, but since there is no rising edge trigger signal on the pin CLK of the D flip-flop, at this time, the Q pin of the D flip-flop still outputs high level to latch the fault; S34. When there is no over-current or over-temperature fault, when the reset signal connected to the diode D3 generates a pulse, the rising edge of the pin CLK of the D flip-flop is triggered, and the Q pin of the D flip-flop follows the pin CLK of the D flip-flop and the pin D outputs a low level to reset the fault and start the laser. At the rising edge of the reset signal, the pin Q of the D flip-flop outputs a high level, and a drive output switch control signal is generated through the diodes D5 and D6 to stop the laser.
[0024] Compared with the prior art, the advantages of the present invention are: The state monitoring and alarm device and method for driving power supply of aerospace laser system of the present invention adopts analog devices to monitor overcurrent and overtemperature faults, and uses logic device D flip-flop to realize latching, resetting and other operations, without using digital processor, and has high response sensitivity to faults, and can timely identify, respond and execute operations, thereby avoiding damage to the laser. The state monitoring and alarm device for driving power supply of aerospace laser system of the present invention is simple and reliable, without using digital processor, can be applied to the aerospace field, does not involve software, and has the advantages of short design cycle and low cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a circuit principle diagram of the state monitoring and alarm device for the driving power supply of the aerospace laser system in the present invention; Figure 2 It is a functional truth table diagram of a D flip-flop in the alarm signal latch reset control circuit of the present invention; Figure 3 It is the circuit schematic diagram of the current alarm circuit; Figure 4 It is the circuit schematic diagram of the temperature alarm circuit; Figure 5 It is a simulation waveform diagram of the state monitoring and alarm device for the driving power supply of the aerospace laser system in the present invention. DETAILED DESCRIPTION
[0026] The present invention will be further described below in conjunction with the accompanying drawings: like Figure 1 A state monitoring alarm device for a space laser system driving power supply is shown, and the device includes a current alarm circuit, a temperature alarm circuit and an alarm signal latch reset control circuit. The input end of the current alarm circuit is connected to the output current of the laser constant current drive, and the output end of the current alarm circuit is connected to the input end of the alarm signal latch reset control circuit; the input end of the temperature alarm circuit is connected to the temperature output of the laser, and the output end of the temperature alarm circuit is connected to the input end of the alarm signal latch reset control circuit. The present invention uses low-cost low-cost components (such as D triggers, diodes, resistors, capacitors, etc.), which not only reduces the overall cost of the system, but also ensures the high reliability of the system through a simple and reliable circuit design. The present invention integrates the current alarm, temperature alarm and alarm signal latch reset control functions into one, realizes comprehensive protection of the laser through a unified circuit design, and improves the system's integration and functional diversity.
[0027] The current alarm circuit is used to monitor the output current of each laser constant current drive in real time, and generate an overcurrent alarm signal in time when the specified current limit is exceeded, and the high level is effective. The current alarm circuit is implemented as follows: a power resistor is used to sample the output current signal, an operational amplifier amplifies the sampled signal in phase, and then a comparator is used to compare the output current alarm level with the reference level.
[0028] like Figure 3 As shown, the current alarm circuit includes two functional circuits: a common-phase amplifier circuit composed of an operational amplifier U2, a resistor R3, a resistor R4, and a resistor R5, and a level comparison circuit composed of a comparator U3 and a current reference Vrefi. The common-phase input terminal of the operational amplifier U2 is connected to the main power output loop and is also grounded through the resistor R3; the inverting input terminal of the operational amplifier U2 is grounded through the resistor R4, and the inverting input terminal of the operational amplifier U2 is also connected to the output terminal of the operational amplifier U2 through the resistor R5. The output terminal of the operational amplifier U2 is connected to the common-phase input terminal of the comparator U3, the inverting input terminal of the comparator U3 is connected to the current reference Vrefi, and the output terminal of the comparator U3 outputs a current alarm signal.
[0029] In the current alarm circuit, resistor R3 is a current sampling resistor connected to the main power output loop; the value of R5 / R4 determines the amplification factor of the sampling current signal. The amplified current sampling signal output by the operational amplifier U2 is compared with the current reference level Vrefi by the comparator U3, and the high and low levels, i.e., the current alarm signal, are output. The alarm current threshold can be changed by adjusting the current reference level Vrefi.
[0030] The temperature alarm circuit is used to monitor the temperature of each laser in real time, and generate an over-temperature alarm signal in time when the specified operating temperature range is exceeded, and the high level is effective. The temperature alarm circuit is implemented as follows: a thermistor is used to sample the laser temperature, and the temperature information is converted into a voltage signal by a resistor divider, and then a comparator is used to compare it with the reference level to output the temperature alarm level.
[0031] like Figure 4As shown, the temperature alarm circuit includes a voltage-dividing resistor R6, a thermistor R7, a comparator U4 and a comparator U5. The non-inverting input terminal of the comparator U4 is connected to the low-temperature reference signal Vref_tdw, the inverting input terminal of the comparator U4 is connected to the power supply VCC via the voltage-dividing resistor R6, and the inverting input terminal of the comparator U4 is also grounded via the resistor R7. The output terminal of the comparator U4 is connected to the anode of the diode D7. The non-inverting input terminal of the comparator U5 is connected to the inverting input terminal of the comparator U4, and the inverting input terminal of the comparator U5 is connected to the high-temperature reference signal Vref_tgw. The output terminal of the comparator U5 is connected to the anode of the diode D8. The cathode of the diode D7 is connected to the cathode of the diode D8 and then outputs a temperature alarm signal.
[0032] like Figure 4 As shown, the resistance of the thermistor R7 in the temperature alarm circuit changes with the temperature, and then converts the temperature information into a voltage signal with the voltage divider resistor R6 to realize temperature signal acquisition; the collected voltage signal is compared with the low temperature reference signal Vref_tdw and the high temperature reference signal Vref_tgw through comparators U4 and U5 respectively, and high and low temperature alarm signals are output, which are synthesized into a temperature alarm signal through diodes D7 and D8. By adjusting the level of the low temperature reference signal Vref_tdw or the high temperature reference signal Vref_tgw, the threshold of the alarm temperature can be adjusted.
[0033] The alarm signal latch reset control circuit is used to receive various alarm signals and use the rising edge triggering characteristics of the D flip-flop to implement fault latching, resetting, power-on alarm / non-alarm, switch control and other functions. Figure 1 As shown, the alarm signal latch reset control circuit includes a D flip-flop, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and an inverter U1. The anode of the diode D1 is connected to the output end of the current alarm circuit, and the cathode of the diode D1 is respectively connected to the pin D of the D flip-flop and the anode of the diode D4. The anode of the diode D2 is connected to the output end of the temperature alarm circuit, and the cathode of the diode D2 is respectively connected to the pin D of the D flip-flop and the anode of the diode D4. The anode of the diode D3 is connected to the reset signal, and the cathode is connected to the pin CLK of the D flip-flop. The reset pin of the D flip-flop They are respectively connected to the first end of the resistor R1 and the first end of the capacitor C1. The second end of the resistor R1 is connected to the VCC power supply. The second end of the capacitor C1 is grounded. The pin Q of the D flip-flop is connected to the positive electrode of the diode D5, the input end of the inverter U1 is connected to the drive output enable signal, the output end is connected to the positive electrode of the diode D6, and the cathode of the diode D6 is connected to the cathode of the diode D5 and then used as the drive output switch control signal. The diodes D1 to D6 in the alarm signal latch reset control circuit are all used for signal isolation, and the inverter U1 is used for enable signal logic conversion.
[0034] When the state monitoring and alarm device for the driving power supply of the aerospace laser system of the present invention is powered on, it can be set to alarm when powered on or not according to the use requirements. During the operation of the laser, overcurrent and overtemperature faults are monitored in real time by analog comparison. Once a fault occurs, the alarm signal is set to a high level, and the state is latched, and the laser drive output is turned off at the same time. The alarm signal is cleared by a reset signal, and the drive output can be turned on again by an enable signal.
[0035] The present invention ensures timely discovery and handling of faults by real-time monitoring of current and temperature, and immediately generating an alarm signal when exceeding the specified limit; in particular, by using the rising edge triggering characteristics of the D flip-flop, fast fault latching and resetting are achieved, thereby improving the response speed of the system. The present invention implements the latching function of the fault through the D flip-flop, and even after the fault disappears, the alarm signal is still maintained until the reset signal arrives, which is helpful for tracking and recording the fault and improving the maintenance and management efficiency of the system. The present invention generates a drive output switch control signal through the alarm signal latch reset control circuit, which can automatically cut off the power supply of the laser when a fault is detected, thereby ensuring the safety and reliability of the system. The present invention implements signal isolation through diodes D1 to D6 to prevent interference between different signals. At the same time, the logic conversion of the enable signal is implemented through the inverter U1, thereby ensuring the correctness of the drive output switch control signal and improving the stability and reliability of the system.
[0036] like Figure 2 The functional truth table of the D flip-flop in the alarm signal latch reset control circuit is combined with Figure 2 and Figure 5 , the working principle of the state monitoring and alarm device for the driving power supply of the above-mentioned aerospace laser system is explained.
[0037] S1, current alarm The power resistor in the current alarm circuit samples the output current signal, which is amplified by the operational amplifier and then sent to the comparator. The comparator compares the sampled signal with the reference level. When the output current exceeds the specified limit, the comparator outputs a high level and generates an overcurrent alarm signal.
[0038] S2, temperature alarm The thermistor in the temperature alarm circuit samples the laser temperature and converts the temperature information into a voltage signal using a resistor divider. The comparator compares the voltage signal with the reference level. When the temperature exceeds the specified range, the comparator outputs a high level and generates an over-temperature alarm signal.
[0039] S3, alarm signal latch reset control Diodes D1 and D2 send the current alarm signal and temperature alarm signal to pin D of the D flip-flop respectively. Diode D3 sends the reset signal to pin CLK of the D flip-flop. When any alarm signal (overcurrent or overtemperature) becomes high, pin D of the D flip-flop becomes high. At the rising edge of the reset signal, pin Q of the D flip-flop outputs a high level, and generates a drive output switch control signal through diodes D5 and D6 to stop the laser. The clear pin realizes the power-on reset function through resistor R1 and capacitor C1 to ensure that the system is in a non-alarm state when powered on. Inverter U1 is used to enable signal logic conversion to ensure the correctness of the drive output switch control signal.
[0040] (1) Power-on alarm / non-alarm function Set the preset pin of the D flip-flop The charging time of R1C1 is designed to be much longer than the reset pin of the D flip-flop The R2C2 charging time can realize the Q pin output high level when powered on, that is, the default fault is reported when powered on, which is Figure 2 The state 1 in the truth table is shown. On the contrary, when the power is turned on, the Q pin outputs a low level, that is, the default report is normal when the power is turned on, which is Figure 2 The situation of state 2 in the truth table shown.
[0041] (2) Alarm and latch functions When the output is overcurrent or the temperature exceeds the limit, the fault signal changes from low to high level, the pin CLK of the D flip-flop is triggered by the rising edge, and the Q pin of the D flip-flop follows the pin D to output a high level, realizing the fault alarm, which is the case of state 4 in the truth table. Even if the fault disappears, the pin D of the D flip-flop returns to a low level, but because the pin CLK of the D flip-flop has no rising edge trigger signal, the Q pin still maintains an output high level, realizing fault latching.
[0042] (3) Fault reset function When the circuit has no over-current or over-temperature faults, when the reset signal connected to diode D3 generates a pulse, the rising edge of the CLK pin of the D flip-flop is triggered, and the Q pin of the D flip-flop follows the CLK pin of the D flip-flop to output a low level, thereby achieving fault reset, which is the case of state 5 in the truth table.
[0043] The alarm signal latch reset circuit is simulated and verified with the help of Spice simulation tools. Signal 1 simulates the fault signal at 8ms, signal 2 simulates the reset signals at 6ms and 10ms, signal 4 simulates the drive output enable signals at 1ms and 11ms, and signal 3 is the alarm signal. Figure 5 The simulation waveform shown shows that the alarm signal (waveform 3) can reflect and latch the fault alarm signal (waveform 1). The alarm signal is initially high until the reset signal (waveform 2) is cleared by the rising edge. After the alarm is cleared, the enable signal (waveform 4) can re-enable the drive circuit. Figure 5 In the figure, the horizontal axis is time in ms, and the vertical axis is voltage in V. The 0 coordinate is different for different models.
[0044] In summary, the state monitoring and alarm device for the driving power supply of the aerospace laser system described in the present invention can realize the latching, resetting and switch control of the laser overcurrent and overtemperature faults by using low-cost logic control devices, thereby effectively protecting the laser in the laser system. Compared with the prior art, the present invention has made improvements and innovations in many aspects, and has realized comprehensive protection of the laser through low-cost logic control devices. The specific improvements include low cost and high reliability, multi-function integration, real-time monitoring and rapid response, fault latching and resetting, power-on reset function, switch control function, and signal isolation and logic conversion. These improvements not only improve the performance and reliability of the system, but also reduce costs and enhance the user experience.
[0045] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the scope of protection determined by the claims of the present invention.
Claims
1. A state monitoring and alarm device for a space laser system driving power supply, characterized in that: The device includes a current alarm circuit, a temperature alarm circuit and an alarm signal latch reset control circuit; The current alarm circuit is used to monitor the output current of the constant current drive of each laser in real time, and generate an overcurrent alarm signal in time when the current exceeds the specified limit; The temperature alarm circuit is used to monitor the temperature of each laser in real time and generate an over-temperature alarm signal in time when the temperature exceeds the specified operating temperature range; The alarm signal latch reset control circuit is used to receive various alarm signals and utilize the rising edge triggering characteristics of the D flip-flop to realize fault latching, resetting, power-on alarm / non-alarm, and switch control.
2. The state monitoring and alarm device for driving power supply of aerospace laser system according to claim 1, characterized in that: The current alarm circuit uses a power resistor to sample the output current signal, uses an operational amplifier to amplify the sampled signal in phase, and then compares it with a reference level through a comparator to output a current alarm level; The current alarm circuit includes two functional circuits: a common-phase amplifier circuit composed of an operational amplifier U2, a resistor R3, a resistor R4, and a resistor R5, and a level comparison circuit composed of a comparator U3 and a current reference Vrefi; the common-phase input terminal of the operational amplifier U2 is connected to the main power output loop and is also grounded through the resistor R3; the inverting input terminal of the operational amplifier U2 is grounded through the resistor R4, and the inverting input terminal of the operational amplifier U2 is also connected to the output terminal of the operational amplifier U2 through the resistor R5; the output terminal of the operational amplifier U2 is connected to the common-phase input terminal of the comparator U3, the inverting input terminal of the comparator U3 is connected to the current reference Vrefi, and the output terminal of the comparator U3 outputs a current alarm signal.
3. The state monitoring and alarm device for driving power supply of aerospace laser system according to claim 1, characterized in that: The temperature alarm circuit uses a thermistor to sample the laser temperature, converts the temperature information into a voltage signal by using a resistor divider, and then compares it with a reference level through a comparator to output a temperature alarm level; The temperature alarm circuit includes a voltage-dividing resistor R6, a thermistor R7, a comparator U4 and a comparator U5; the non-inverting input terminal of the comparator U4 is connected to a low-temperature reference signal Vref_tdw, the inverting input terminal of the comparator U4 is connected to a power supply VCC via a voltage-dividing resistor R6, and the inverting input terminal of the comparator U4 is also grounded via a resistor R7; the output terminal of the comparator U4 is connected to an anode of a diode D7; the non-inverting input terminal of the comparator U5 is connected to an inverting input terminal of the comparator U4, and the inverting input terminal of the comparator U5 is connected to a high-temperature reference signal Vref_tgw; the output terminal of the comparator U5 is connected to an anode of a diode D8; the cathode of the diode D7 is connected to a cathode of the diode D8, and then a temperature alarm signal is output.
4. The state monitoring and alarm device for driving power supply of aerospace laser system according to claim 1, characterized in that: The alarm signal latch reset control circuit includes a D flip-flop, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and an inverter U1; The anode of the diode D1 is connected to the output end of the current alarm circuit, and the cathode of the diode D1 is respectively connected to the pin D of the D flip-flop and the anode of the diode D4; the anode of the diode D2 is connected to the output end of the temperature alarm circuit, and the cathode of the diode D2 is respectively connected to the pin D of the D flip-flop and the anode of the diode D4; the anode of the diode D3 is connected to the reset signal, and the cathode is connected to the pin CLK of the D flip-flop; the reset pin of the D flip-flop They are respectively connected to the first end of the resistor R1 and the first end of the capacitor C1; the second end of the resistor R1 is connected to the VCC power supply; the second end of the capacitor C1 is grounded; the pin Q of the D trigger is connected to the positive electrode of the diode D5, the input end of the inverter U1 is connected to the drive output enable signal, the output end is connected to the positive electrode of the diode D6, and the cathode of the diode D6 is connected to the cathode of the diode D5 to serve as the drive output switch control signal.
5. The state monitoring and alarm device for driving power supply of aerospace laser system according to claim 1, characterized in that: The diodes D1 to D6 in the alarm signal latch reset control circuit are all used for signal isolation.
6. The state monitoring and alarm device for driving power supply of aerospace laser system according to claim 1, characterized in that: The inverter U1 is used for enabling signal logic conversion.
7. The working method of the state monitoring and alarm device for a space laser system driving power supply according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1, the current alarm circuit monitors the output current of each laser constant current drive in real time, and generates an overcurrent alarm signal in time when the specified current limit is exceeded; S2, the temperature alarm circuit monitors the temperature of each laser in real time, and generates an over-temperature alarm signal in time when the specified operating temperature range is exceeded; S3. The alarm signal latch reset control circuit receives various alarm signals and uses the rising edge triggering characteristics of the D flip-flop to implement fault latching, reset, power-on alarm / non-alarm and switch control.
8. The working method of the state monitoring and alarm device for driving power supply of aerospace laser system according to claim 7 is characterized in that: In step S1, the current alarm circuit monitors the output current of each laser constant current drive in real time, and generates an overcurrent alarm signal in time when the current exceeds the specified current limit, including: The power resistor in the current alarm circuit samples the output current signal, which is amplified by the operational amplifier in phase and then sent to the comparator. The comparator compares the sampled signal with the reference level. When the output current exceeds the specified limit, the comparator outputs a high level and generates an overcurrent alarm signal.
9. The working method of the state monitoring and alarm device for driving power supply of aerospace laser system according to claim 7, characterized in that: In step S2, the temperature alarm circuit monitors the temperature of each laser in real time and generates an over-temperature alarm signal in time when the temperature exceeds the specified operating temperature range, including: The thermistor in the temperature alarm circuit samples the laser temperature and converts the temperature information into a voltage signal using resistance voltage division. The comparator compares the voltage signal with the reference level. When the temperature exceeds the specified range, the comparator outputs a high level and generates an over-temperature alarm signal.
10. The working method of the state monitoring and alarm device for driving power supply of aerospace laser system according to claim 7, characterized in that: In step S3, the alarm signal latch reset control circuit receives various alarm signals and uses the rising edge triggering characteristics of the D flip-flop to implement fault latching, reset, power-on alarm / non-alarm and switch control, including: S31, the reset pin of the D flip-flop realizes power-on reset through resistor R1 and capacitor C1, so that the system is in a non-alarm state when powered on; S32, diodes D1 and D2 send the current alarm signal and temperature alarm signal to the pin D of the D flip-flop respectively, and diode D3 sends the reset signal to the pin CLK of the D flip-flop; when any alarm signal becomes high level, the pin D of the D flip-flop becomes high level, and a fault alarm is issued; S33, after the over-current or over-temperature fault disappears, that is, when any alarm signal becomes low level, the pin D of the D flip-flop returns to low level, but since there is no rising edge trigger signal on the pin CLK of the D flip-flop, at this time, the Q pin of the D flip-flop still outputs high level to latch the fault; S34. When there is no over-current or over-temperature fault, when the reset signal connected to the diode D3 generates a pulse, the rising edge of the pin CLK of the D flip-flop is triggered, and the Q pin of the D flip-flop follows the pin CLK of the D flip-flop and the pin D outputs a low level to reset the fault and start the laser. At the rising edge of the reset signal, the pin Q of the D flip-flop outputs a high level, and a drive output switch control signal is generated through the diodes D5 and D6 to stop the laser.