Anti-latch-up power management circuit, system and method for space-borne fiber optic gyroscope

Abstract

The embodiment of the application relates to the technical field of power management, in particular to a satellite-borne optical fiber gyro power management circuit, system and method resisting latching. The circuit comprises: a current limiting circuit module, a voltage conversion circuit 2 for providing three different voltage power supply links for optical fiber gyro signal detection circuit, and current limiting resistors respectively arranged on the three power supply links; the input end of the current limiting circuit module is connected to an external power supply, and the output end is connected to the voltage conversion circuit 2; the current limiting circuit module is used for current monitoring and autonomous shutdown and start of the optical fiber gyro whole machine; the voltage conversion circuit 2 adopts a multi-channel DC / DC chip, and the three power supply links are respectively provided with current limiting resistors; the current limiting resistors are used for resisting latching current limiting of the integrated circuits connected correspondingly by the power supply links. The scheme realizes multiple protection against single particle latching through the mode of autonomous shutdown and restart of the current limiting circuit module and the protection of the multi-voltage power supply link current limiting resistors.

Description

Technical Field

[0001] This invention relates to the field of power management technology, and in particular to a latch-up-resistant power management circuit, system, and method for a spaceborne fiber optic gyroscope. Background Technology

[0002] Miniaturized spaceborne fiber optic gyroscopes not only place high demands on system reliability, service life, and maintenance-free operation, but also face strict limitations on size, weight, and power consumption. Therefore, circuit design should be as reliable, stable, and simple as possible while ensuring the system functions meet overall requirements.

[0003] The detection circuit of fiber optic gyroscope products needs to amplify and acquire photodetector signals, demodulate them, and control the Y-waveguide to complete closed-loop control. Operational amplifiers, AD chips, DA chips, and FPGA chips are generally used to perform these functions. Due to the requirements of miniaturization and low power consumption, the new generation of 7-series FPGAs are widely used. The power supply voltage of the above chips is +5V, -5V, +3.3V, +1.8V, and +1V, with many types available, and there is a need for multi-voltage power supply management.

[0004] Because fiber optic gyroscopes are exposed to space particle bombardment during on-orbit operation, single-event latch-up protection is an essential reliability safeguard for spaceborne products. When a single-event latch-up occurs, the chip current increases. If the product lacks single-event latch-up protection, this high current can cause the chip to burn out, resulting in an irreversible failure.

[0005] Therefore, there is an urgent need for a latch-up resistant power management circuit, system, and method for spaceborne fiber optic gyroscopes. Summary of the Invention

[0006] To address the problem that single-event latch-up can cause chip burnout due to high current during on-orbit operation of fiber optic gyroscopes, this invention provides an anti-latch-up power management circuit, system, and method for spaceborne fiber optic gyroscopes.

[0007] In a first aspect, embodiments of the present invention provide a latch-up resistant power management circuit for a spaceborne fiber optic gyroscope, comprising: a current limiting circuit module, a voltage conversion circuit 2 for providing three different voltage power supply links for the fiber optic gyroscope signal detection circuit, and current limiting resistors respectively disposed on the three power supply links; The input terminal of the current limiting circuit module is connected to an external power supply, and the output terminal is connected to the voltage conversion circuit 2. The current limiting circuit module is used to monitor the current of the fiber optic gyroscope and enable autonomous shutdown and startup. The voltage conversion circuit 2 uses a multi-channel DC / DC chip to output three voltages to power the fiber optic gyroscope signal detection circuit. Each of the three power supply links is equipped with a current-limiting resistor, which is used to perform latch-up current limiting on the integrated circuit connected to the corresponding power supply link.

[0008] Secondly, embodiments of the present invention also provide a spaceborne fiber optic gyroscope power management system, including: an external power supply, a power management circuit as described in any embodiment of this specification, a fiber optic gyroscope signal detection circuit, a level isolation circuit, a preamplifier circuit, a postamplifier circuit, a light source driving circuit, and a light source temperature control circuit. An external power supply is connected to the input terminal of the power management circuit. The output terminal of the power management circuit is connected to the fiber optic gyroscope signal detection circuit, the level isolation circuit, the light source driving circuit, and the light source temperature control circuit, respectively. The preamplifier circuit and the postamplifier circuit are respectively connected to the level isolation circuit. The power management circuit is used to supply power to the fiber optic gyroscope signal detection circuit, the level isolation circuit, the preamplifier circuit, the postamplifier circuit, the light source driving circuit, and the light source temperature control circuit, and provides anti-latch-up function.

[0009] Thirdly, embodiments of the present invention also provide a power management method based on the power management circuit described in any embodiment of this specification, the method comprising: The voltage conversion circuit 2 outputs three different voltages to power the fiber optic gyroscope signal detection circuit. Each of the three power supply links is equipped with a current-limiting resistor, and the current-limiting resistor is used to perform latch-up current limiting on the integrated circuits connected to each power supply link. The current limiting circuit module is used to monitor the current of the fiber optic gyroscope and enable autonomous shutdown and startup.

[0010] This invention provides a latch-up-resistant power management circuit, system, and method for spaceborne fiber optic gyroscopes. By autonomously shutting down and restarting a current-limiting circuit module in conjunction with current-limiting resistor protection for multi-voltage power supply links, it prevents the functional circuits in a single power supply voltage link from burning out due to single-event latch-up. The current-limiting circuit module monitors the overall current changes of the fiber optic gyroscope product, and autonomously shuts down and restarts after a single-event latch-up occurs, thereby resolving the single-event latch-up fault in the fiber optic gyroscope. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1This is a circuit diagram of a latch-up resistant spaceborne fiber optic gyroscope power management system provided in one embodiment of the present invention; Figure 2 This is a flowchart of a latch-up-resistant spaceborne fiber optic gyroscope power management method according to an embodiment of the present invention. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0014] The specific implementation of the above concept is described below.

[0015] Please refer to Figure 1 This invention provides a latch-up resistant power management circuit for a spaceborne fiber optic gyroscope. The circuit includes: a current limiting circuit module, a voltage conversion circuit 2 for providing three different voltage power supply links for the fiber optic gyroscope signal detection circuit, and current limiting resistors respectively disposed on the three power supply links. The input terminal of the current limiting circuit module is connected to an external power supply, and the output terminal is connected to voltage conversion circuit 2. The current limiting circuit module is used to monitor the current of the fiber optic gyroscope and enable autonomous shutdown and startup. The voltage conversion circuit 2 uses a multi-channel DC / DC chip to output three voltages to power the fiber optic gyroscope signal detection circuit. Each of the three power supply links is equipped with a current-limiting resistor, which is used to perform latch-up current limiting on the integrated circuit connected to the corresponding power supply link.

[0016] In this embodiment of the invention, the functional circuits in a single power supply voltage link are prevented from burning out due to single-event latch-up by the autonomous shutdown and restart of the current limiting circuit module combined with the current limiting resistor protection of the multi-voltage power supply link. The current limiting circuit module monitors the overall current change of the fiber optic gyroscope product, and autonomously performs a power-off restart after a single-event latch-up occurs, thereby relieving the single-event latch-up fault of the fiber optic gyroscope.

[0017] The following is based on Figure 1 The circuit diagram shown is used for illustration.

[0018] Voltage conversion circuit 2 employs a multi-channel DC / DC chip, capable of outputting multiple voltages to power the downstream integrated circuit. Traditionally, three different output voltages power the fiber optic gyroscope signal detection circuit, typically achieved using multiple voltage conversion circuits. However, to achieve product miniaturization, effectively reduce circuit size and power consumption, this embodiment uses a four-channel point power supply RSHF4644ARH to convert the 3.3V, 1.8V, and 1V voltages required by the detection circuit. Accurate output of the three voltages is achieved by configuring voltage divider resistors in each channel. Current-limiting resistors are added to the output terminals of the RSHF4644ARH supplying 1V, 1.8V, and 3.3V to the radiation-sensitive integrated circuit as an anti-latch-up protection measure.

[0019] In some embodiments, the current-limiting resistor value is set for each power supply link in the following manner: Obtain the operating current, operating voltage, and minimum operating voltage of the integrated circuit corresponding to the current power supply link; Based on the operating current, determine the single-event latch-up current threshold of the current power supply link; The current-limiting resistor value of the current power supply link is determined based on the single-event latch-up current threshold, the operating current, operating voltage, and minimum operating voltage of the corresponding integrated circuit of the current power supply link.

[0020] It is understandable that since the required three output voltages are different, the current-limiting resistor values ​​for the three channels need to be calculated separately based on the above method.

[0021] Specifically, the current-limiting resistor value of the current power supply link is calculated using the following formula: in, In the formula, The resistance value of the current limiting resistor in the current power supply link. Operating voltage This is the minimum operating voltage. The single-event latch-up current threshold. This is the operating current.

[0022] In this embodiment, the voltage output of the voltage conversion circuit 2 and the value of the current limiting resistor are set to adapt to the power supply voltage requirements of different integrated circuits. The current limiting resistor value is calculated based on the operating voltage, minimum operating voltage, single event latch-up current threshold, and operating current of the current link integrated circuit. When the integrated circuit latches up and the current increases beyond the single event latch-up current threshold, the voltage across the current limiting resistor of the current power supply link increases, so that the actual voltage supplied to the integrated circuit is lower than the minimum operating voltage, thereby achieving the purpose of current limiting and realizing the anti-latch-up function.

[0023] In this embodiment, the output voltage value of each channel of the voltage conversion circuit 2 is calculated using the following formula: In the formula, The output voltage value of the Xth channel of voltage conversion circuit 2. Let X be the resistance value of the current-limiting resistor in the Xth power supply link. Operating voltage This is the operating current.

[0024] In some implementations, the current limiting circuit module includes: a target resistor, a target capacitor, and a current limiting chip; The target resistor is used to set the current limiting threshold for the entire fiber optic gyroscope for the current limiting chip; The target capacitor is used to set the overcurrent detection time and turn-off time for the current limiting chip; The current limiting chip is used to monitor the overall current of the fiber optic gyroscope. When the overall current of the fiber optic gyroscope exceeds the current limiting threshold for a period of time that reaches the overcurrent state current detection time, it is turned off. After the shutdown time reaches the shutdown period, the current limiting chip is activated again to restore power to the back-end circuit.

[0025] In this embodiment, different current limiting thresholds and power supply voltages can be set according to different fiber optic gyroscopes. By setting the target resistance of the current limiting chip, different product latch-up current limiting thresholds can be adapted. While limiting the current of each voltage power supply link in the voltage conversion circuit 2, the fiber optic gyroscope product-level current monitoring can autonomously power off and restart the product in the event of a single event latch-up, thereby relieving the product's single event latch-up fault.

[0026] In some implementations, the current limiting threshold is 1.5 times the rated operating current of the fiber optic gyroscope. The resistance value of the target resistor is calculated using the following formula: In the formula, This refers to the current sampling ratio of the current limiting chip. This is the current mirror ratio of the current limiting chip. This is the rate limiting threshold.

[0027] In this embodiment, a current-limiting threshold for the fiber optic gyroscope is first set based on 1.5 times its rated operating current. Then, based on the aforementioned formula and the current-limiting threshold, the resistance value of the target resistor is determined. Finally, the target resistor is configured based on this calculated resistance value to set the current-limiting threshold of the current-limiting chip. .

[0028] In some implementations, the current limiting chip is turned off when the duration for which the overall current of the fiber optic gyroscope exceeds the current limiting threshold reaches the overcurrent state current detection time. When the turn-off duration reaches the turn-off time, the current limiting chip is activated to: When the current of the fiber optic gyroscope exceeds the current limiting threshold, the target capacitor is charged. The current limiting chip uses a comparator to determine whether the output voltage of the target capacitor reaches the upper limit of the preset threshold voltage in the current limiting chip. When the upper limit of the threshold voltage is reached, it indicates that the time for the current of the fiber optic gyroscope to exceed the current limiting threshold has reached the overcurrent state current detection time, and the power supply is turned off. After the power supply is turned off, the target capacitor charges and discharges. The current limiting chip uses a comparator to determine whether the output voltage of the target capacitor has reached the lower limit of the preset threshold voltage in the current limiting chip. When the lower limit of the threshold voltage is reached, it indicates that the turn-off time has been reached, and the current limiting chip starts.

[0029] In this embodiment, the overcurrent detection time T of the current limiting chip is set by configuring the capacitance value of the target capacitor. ON and shutdown time T OFF After the shutdown time, the current limiting chip starts up and resumes power supply to the back-end circuit. Therefore, this solution uses a current limiting chip in combination with a DC / DC converter to achieve multi-channel power supply and dual anti-latch-up protection, which can reduce circuit complexity, reduce circuit layout area, reduce power consumption, and is convenient, novel and unique.

[0030] Overcurrent detection time T ON and shutdown time T OFF Determined by the following formula: In the formula, This represents the detection time coefficient of the current-limiting chip. The capacitance value of the target capacitor.

[0031] refer to Figure 1 The latch-up-resistant spaceborne fiber optic gyroscope power management circuit also includes: voltage conversion circuit 1 and LDO voltage regulator circuit; The input terminal of voltage conversion circuit 1 is connected to the output terminal of LDO voltage regulator circuit, and the output terminal is connected to level isolation circuit. Voltage conversion circuit 1 is used to convert the +5V voltage provided by external power supply to -5V voltage input to level isolation circuit. The LDO voltage regulator circuit is connected between the current limiting circuit module and the voltage conversion circuit 1. It is used to regulate the voltage and provide overvoltage protection for the back-end functional circuits to prevent the supplied voltage from exceeding the maximum input voltage of the operational amplifier connected after the chip and level isolation circuit in the voltage conversion circuit 1.

[0032] In this embodiment, because the spaceborne fiber optic gyroscope product uses a single +5V secondary power supply to simplify the power interface, a +5V to -5V voltage conversion is required to ensure proper power supply to components such as the operational amplifier. Since the rated input voltage range of the +5V to -5V voltage conversion chip is 4.5V to 5.5V, and the maximum rated input voltage of the operational amplifier is 5.5V, a +5V LDO voltage regulator circuit is added at the input terminal to provide a stable +5V voltage to subsequent devices. This improves the safe power supply voltage range at the secondary power supply input and prevents circuit damage caused by voltage exceeding the rated power supply voltage of critical components.

[0033] It should be noted that the input terminal of voltage conversion circuit 2 is connected to the output terminal of the current limiting circuit module, and does not need to be connected to the LDO voltage regulator circuit, which can reduce the power consumption of the LDO voltage regulator circuit.

[0034] This invention provides a power management circuit for a spaceborne fiber optic gyroscope with anti-latch-up functionality. Due to the low-power design requirements of miniaturized fiber optic gyroscopes, and to reduce the variety of power supply types, a +5V external power interface is adopted. A current-limiting protection chip is installed at the input end. The voltage conversion circuit 2 internally uses a DC / DC power conversion chip to generate the required voltage level, supplying power to key components on the circuit board and reducing power consumption. The selection of each component in the current-limiting chip, LDO regulator chip, DC / DC chip, and voltage conversion circuit 1 is shown in the table below: 1 RSSW0702IRH Radiation-resistant 2A Load Switch The system automatically shuts down and restarts after reaching the current limiting protection threshold; its single-event latch-up resistance index is >75MeV.cm2 / mg. 2 RSW1201AURH-5V0 Radiation-resistant Linear Voltage Regulator +5V voltage regulation provides a safe input for subsequent +5V to -5V chips and +5V power supply devices; single-event latch-up resistance >75MeV.cm² / mg 3 RSHF4644ARH Radiation-resistant Four-channel Point-of-Load Power Supply +5V is converted to 3.3V, 1.8V, and 1V to provide the required voltage input for subsequent detection circuits; single-event latch-up resistance is >75MeV.cm² / mg. 4 LDC01-05-05SRH type DC / DC converter +5V to -5V; Single-event latch-up resistance: 75 MeV.cm² / mg Firstly, the RSSW0702IRH radiation-hardened load switch is selected as the core component of the latch-up current limiting circuit at the input end. This component can withstand a total ionizing dose of 100 klad(Si) and a single-event latch-up of 75 MeV·cm² / mg. By setting a configuration resistor, this chip can realize the circuit's current limiting protection and autonomous power-off restart. In one embodiment, the rated operating current of the fiber optic gyroscope is less than 0.9A (including temperature control) under full temperature conditions. The current limiting protection threshold is set to 1.35A (generally, single-event latch-up occurs when the current exceeds 1.5 times the rated operating current). When the current limiting protection threshold is exceeded for 1.11ms, the device is turned off and restarted after 11.1ms, achieving effective protection against product-level single-event latch-up.

[0035] In this embodiment, the latch-up prevention effect of the current-limiting resistor in the voltage conversion circuit 2 was verified, as shown in the table below.

[0036] 1V output 1.2997V Two 10Ω resistors in parallel 60mA 0.9997V The current rises to 120mA, and the actual output voltage is 0.7V, which is lower than the device's minimum operating voltage of 0.97V, thus achieving the anti-latch-up function. 1.8V output 2.021V Two 2Ω resistors in parallel 220mA 1.801V The current rises to 440mA, and the actual output voltage is 1.58V, which is lower than the device's minimum operating voltage of 1.7V. Since the voltage drop exceeds UMIN, the latch-up protection function is achieved. 3.3V output 3.5898V Two 4.7Ω resistors in parallel 130mA 3.284V The current rises to 260mA, and the actual output voltage is 2.9788V, which is lower than the device's minimum operating voltage of 3V, thus achieving the anti-latch-up function.

[0037] As can be seen, this invention adapts to different product latch-up current thresholds by setting the current limiting threshold resistor of the current limiting chip, adapts to the power supply voltage requirements of different integrated circuits by setting the voltage output and current limiting resistor of the voltage conversion circuit 2, and autonomously restarts the product in the event of a single-event latch-up through product-level current monitoring and current limiting of each voltage power supply link, thereby relieving the product's single-event latch-up fault.

[0038] This embodiment also provides a spaceborne fiber optic gyroscope power management system, including: an external power supply, a power management circuit as described in any embodiment of the specification, a fiber optic gyroscope signal detection circuit, a level isolation circuit, a preamplifier circuit, a postamplifier circuit, a light source driving circuit, and a light source temperature control circuit. An external power supply is connected to the input terminal of the power management circuit. The output terminal of the power management circuit is connected to the fiber optic gyroscope signal detection circuit, the level isolation circuit, the light source driving circuit, and the light source temperature control circuit, respectively. The preamplifier circuit and the postamplifier circuit are connected to the level isolation circuit, respectively. The power management circuit is used to supply power to the fiber optic gyroscope signal detection circuit, the level isolation circuit, the preamplifier circuit, the postamplifier circuit, the light source driving circuit, and the light source temperature control circuit, and provides anti-latch-up function.

[0039] It should be noted that the above power system embodiment and the power management circuit embodiment belong to the same concept, and the specific implementation process can be found in the power management circuit embodiment, which will not be repeated here.

[0040] like Figure 2 As shown, this embodiment also provides a power management method based on the power management circuit of this specification, the method including: 200, using voltage conversion circuit 2 to output three different voltages to power the fiber optic gyroscope signal detection circuit, each of the three power supply links is equipped with a current limiting resistor, and the current limiting resistor is used to perform latch-up current limiting on the integrated circuits connected to each power supply link. 202. The current limiting circuit module is used to monitor the current of the fiber optic gyroscope and enable autonomous shutdown and startup.

[0041] It should be noted that the above method embodiments and power management circuit embodiments belong to the same concept, and the specific implementation process can be found in the power management circuit embodiments, which will not be repeated here.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A latch-up-resistant power management circuit for a spaceborne fiber optic gyroscope, characterized in that, include: The current limiting circuit module, the voltage conversion circuit 2 for providing three different voltage power supply links for the fiber optic gyroscope signal detection circuit, and the current limiting resistors respectively set on the three power supply links; The input terminal of the current limiting circuit module is connected to an external power supply, and the output terminal is connected to the voltage conversion circuit 2. The current limiting circuit module is used to monitor the current of the fiber optic gyroscope and enable autonomous shutdown and startup. The voltage conversion circuit 2 uses a multi-channel DC / DC chip to output three voltages to power the fiber optic gyroscope signal detection circuit. Each of the three power supply links is equipped with a current-limiting resistor, which is used to perform latch-up current limiting on the integrated circuit connected to the corresponding power supply link.

2. The circuit according to claim 1, characterized in that, The current-limiting resistor value is set for each power supply link in the following manner: Obtain the operating current, operating voltage, and minimum operating voltage of the integrated circuit corresponding to the current power supply link; Based on the operating current, determine the single-event latch-up current threshold of the current power supply link; Based on the single-event latch-up current threshold of the current power supply link, the operating current, operating voltage, and minimum operating voltage of the corresponding integrated circuit of the current power supply link, the current limiting resistor value of the current power supply link is determined.

3. The circuit according to claim 2, characterized in that, The resistance value of the current limiting resistor in the current power supply link is calculated using the following formula: in, In the formula, The resistance value of the current limiting resistor in the current power supply link. The operating voltage is... The minimum operating voltage is... The single-particle latch-up current threshold is... The operating current is denoted as .

4. The circuit according to claim 2, characterized in that, The output voltage value of each channel of the voltage conversion circuit 2 is calculated using the following formula: In the formula, The output voltage value of the Xth channel of the voltage conversion circuit 2 is... Let X be the resistance value of the current-limiting resistor in the Xth power supply link. The operating voltage is... The operating current is denoted as .

5. The circuit according to claim 1, characterized in that, The current limiting circuit module includes: a target resistor, a target capacitor, and a current limiting chip; The target resistor is used to set the current limiting threshold for the entire fiber optic gyroscope for the current limiting chip; The target capacitor is used to set the overcurrent detection time and turn-off time for the current limiting chip. The current limiting chip is used to monitor the overall current of the fiber optic gyroscope. When the overall current of the fiber optic gyroscope exceeds the current limiting threshold for a period of time that reaches the overcurrent state current detection time, it is turned off. When the shutdown time reaches the shutdown time, the current limiting chip is activated again to re-supply the back-end circuit.

6. The circuit according to claim 5, characterized in that, The current limiting chip is turned off when the duration for which the overall current of the fiber optic gyroscope exceeds the current limiting threshold reaches the overcurrent state current detection time. When the turn-off duration reaches the turn-off time, the current limiting chip is activated to: When the current of the fiber optic gyroscope exceeds the current limiting threshold, the target capacitor is charged. The current limiting chip uses a comparator to determine whether the output voltage of the target capacitor reaches the upper limit of the preset threshold voltage in the current limiting chip. When the upper limit of the threshold voltage is reached, it indicates that the duration of the current of the fiber optic gyroscope exceeding the current limiting threshold has reached the overcurrent state current detection time, and the power supply is turned off. After the power supply is turned off, the target capacitor is charged and discharged. The current limiting chip uses a comparator to determine whether the output voltage of the target capacitor reaches the preset lower threshold voltage limit in the current limiting chip. When the lower threshold voltage limit is reached, it indicates that the shutdown time has been reached, and the current limiting chip is activated.

7. The circuit according to claim 5, characterized in that, The current limiting threshold is 1.5 times the rated operating current of the fiber optic gyroscope; The resistance value of the target resistor is calculated using the following formula: In the formula, This refers to the current sampling ratio of the current limiting chip. This is the current mirror ratio of the current limiting chip. The current limiting threshold is denoted as .

8. The circuit according to claim 1, characterized in that, Also includes: Voltage conversion circuit 1 and LDO voltage regulator circuit; The input terminal of the voltage conversion circuit 1 is connected to the output terminal of the LDO voltage regulator circuit, and the output terminal is connected to the level isolation circuit. The voltage conversion circuit 1 is used to convert the +5V voltage provided by the external power supply into a -5V voltage input to the level isolation circuit. The LDO voltage regulator circuit is connected between the current limiting circuit module and the voltage conversion circuit 1 to perform voltage regulation and provide overvoltage protection for the back-end functional circuits, so as to avoid the provided voltage exceeding the maximum input voltage of the operational amplifier connected after the chip and level isolation circuit in the voltage conversion circuit 1.

9. A spaceborne fiber optic gyroscope power management system, characterized in that, include: External power supply, power management circuit as described in any one of claims 1-8, fiber optic gyroscope signal detection circuit, level isolation circuit, preamplifier circuit, postamplifier circuit, light source driving circuit, and light source temperature control circuit; An external power supply is connected to the input terminal of the power management circuit. The output terminal of the power management circuit is connected to the fiber optic gyroscope signal detection circuit, the level isolation circuit, the light source driving circuit, and the light source temperature control circuit, respectively. The preamplifier circuit and the postamplifier circuit are respectively connected to the level isolation circuit. The power management circuit is used to supply power to the fiber optic gyroscope signal detection circuit, the level isolation circuit, the preamplifier circuit, the postamplifier circuit, the light source driving circuit, and the light source temperature control circuit, and provides anti-latch-up function.

10. A power management method based on the power management circuit according to any one of claims 1-8, characterized in that, The methods include: The voltage conversion circuit 2 outputs three different voltages to power the fiber optic gyroscope signal detection circuit. Each of the three power supply links is equipped with a current-limiting resistor, and the current-limiting resistor is used to perform anti-latch-up current limiting on the integrated circuits connected to each power supply link. The current limiting circuit module is used to monitor the current of the fiber optic gyroscope and enable autonomous shutdown and startup.

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