A low-power, miniaturized wide-spectrum light source driving circuit for a resonator fiber-optic gyroscope

Abstract

The application provides a low-power and small-size wide-spectrum light source driving circuit of a resonant fiber-optic gyroscope, which comprises a wide-spectrum light source module, a power supply module, a constant current source module, a temperature measurement module, a feedback control module, a switching circuit and a refrigeration or heating module; the overall scheme of the driving circuit is to keep the current flowing through the wide-spectrum light source constant and keep the wide-spectrum light source chip temperature constant, so as to stabilize the outgoing light power and spectrum of the wide-spectrum light source; the power supply module provides power for the constant current source module, the constant current source module generates a constant current to inject into the wide-spectrum light source, and the wide-spectrum light source is excited to emit wide-spectrum light; the temperature measurement module detects the wide-spectrum light source chip temperature in real time, and transmits the detection information to the feedback control module; the feedback control module outputs a control signal through a closed-loop feedback control circuit, and the control signal drives the refrigeration or heating module to refrigerate or heat the wide-spectrum light source chip after passing through the switching circuit.

Description

Technical Field

[0001] This application belongs to the field of resonant fiber optic gyroscope technology, specifically relating to a low-power, miniaturized broadband light source driving circuit for a resonant fiber optic gyroscope. Background Technology

[0002] Resonant fiber optic gyroscopes utilize optical resonance phenomena, achieving high accuracy levels with fiber optic cables of hundreds or even tens of meters. This facilitates smaller size and lower costs, making it an important direction for the future development of gyroscopes. The quality of the light source is one of the key factors affecting the performance of broadband light source resonant fiber optic gyroscopes: the resonant cavity and phase modulation within the gyroscope are particularly sensitive to temperature, and existing research has shown that the gyroscope's output is related to the rate of temperature change. However, current light source driving circuits have high power consumption, generate significant heat, and are bulky. Upon power-up, the internal temperature of the gyroscope rises rapidly, causing output drift and severely impacting the improvement of gyroscope measurement accuracy. Therefore, developing a low-power, miniaturized SLD broadband light source control module is crucial.

[0003] To address this issue, this invention effectively reduces the power consumption of the light source driving circuit through circuit design, thereby improving the measurement accuracy of broadband light source resonant fiber optic gyroscopes. Summary of the Invention

[0004] The purpose of this invention is to address the problems in the background art by proposing a low-power, miniaturized broadband light source driving circuit for resonant fiber optic gyroscopes.

[0005] This application provides a low-power, miniaturized broadband light source driving circuit for a resonant fiber optic gyroscope. The driving circuit includes a broadband light source module, a power supply module, a constant current source module, a temperature measurement module, a feedback control module, a switching circuit, and a cooling or heating module.

[0006] The overall scheme of the driving circuit is to keep the current flowing through the broadband light source constant and keep the temperature of the broadband light source die constant, so as to stabilize the output light power and spectrum of the broadband light source.

[0007] The power module provides power to the constant current source module, which generates a constant current that is injected into the broadband light source to excite the light source to emit broadband light.

[0008] The temperature measurement module detects the temperature of the broadband light source chip in real time and transmits the detection information to the feedback control module. The feedback control module outputs a control signal through a closed-loop feedback control circuit. This control signal then passes through a switching circuit to drive the cooling or heating module to cool or heat the broadband light source chip.

[0009] Preferably, the power supply module is a switching buck regulator circuit: the output voltage of the switching buck regulator circuit turns on the light source diode and meets the normal operation of the constant current source module, thus avoiding heat loss.

[0010] Preferably, the voltage noise output by the switching buck regulator circuit is relatively large. Typically, the switching buck regulator and the filter circuit module or the linear buck regulator are connected in series: the output voltage of the switching buck regulator is input to the filter circuit or the linear buck regulator, and then the output of the filter circuit or the linear buck regulator is used as the power supply for the constant current source module.

[0011] Preferably, the temperature measurement module detects the error between the broadband light source chip temperature and the set temperature in real time, has a sufficiently large temperature measurement range, and within the measurement range, the temperature and the output signal have an approximately linear relationship.

[0012] Preferably, the feedback control module includes a feedback control loop, which takes the temperature signal from the temperature measurement module as input and outputs a voltage signal to drive the cooling or heating module: when the temperature of the light source die is higher than the set value, the cooling or heating module is driven to cool the die, and when the temperature of the light source die is lower than the set value, the cooling or heating module is driven to heat the die.

[0013] Preferably, the output signal of the feedback control module needs to pass through a switching circuit before driving the cooling or heating module.

[0014] Preferably, all circuit components used are selected in the smallest possible package while meeting functional and performance requirements.

[0015] This application has the following technical advantages:

[0016] This invention designs a low-power, miniaturized broadband light source driving circuit for resonant fiber optic gyroscopes, providing a solution for reducing the power consumption and size of light source driving circuits, and offering significant assistance in improving the measurement accuracy of resonant fiber optic gyroscopes. Attached Figure Description

[0017] Figure 1 Block diagram of a low-power, miniaturized broadband light source driving circuit system;

[0018] Figure 2 This is a block diagram of the light source temperature control system;

[0019] Figure 3 The output of the temperature measurement network changes with temperature;

[0020] Figure 4 The optical power output of the SLD light source over 10 hours;

[0021] Explanation of the reference numerals in the attached diagram: 1 is the broadband light source module, 2 is the power supply module, 3 is the constant current source module, 4 is the temperature measurement module, 5 is the feedback control module, 6 is the switching circuit, and 7 is the cooling or heating module. Detailed Implementation

[0022] Please see Figures 1-4 A low-power, miniaturized broadband light source driving circuit for resonant fiber optic gyroscopes is provided, characterized in that the device includes: a broadband light source 1, a power supply module 2, a constant current source module 3, a temperature measurement module 4, a feedback control module 5, a switching circuit 6, and a cooling (heating) module 7.

[0023] The overall scheme of the driving circuit is to keep the current flowing through the broadband light source constant and keep the temperature of the broadband light source die constant so as to stabilize the output light power and spectrum of the broadband light source.

[0024] Power module 2 provides power to constant current source module 3, which generates a constant current that is injected into the broadband light source to excite the light source to emit broadband light.

[0025] Temperature measurement module 4 detects the temperature of the broadband light source chip in real time and transmits the detection information to feedback control module 5. Feedback control module 5 controls the signal through closed-loop feedback control circuit. The control signal then passes through switching circuit 6 and drives cooling (heating) module 7 to cool or heat the broadband light source chip.

[0026] Furthermore, in order to reduce power consumption, the core of the power supply module 2 is a switching buck regulator circuit: the output voltage of the switching buck regulator circuit turns on the light source diode and meets the normal operation of the constant current source module 3, thus avoiding heat loss.

[0027] Furthermore, the output voltage noise of the switching buck regulator circuit is relatively large. Usually, the switching buck regulator and the filter circuit module or the linear buck regulator are connected in series: the output voltage of the switching buck regulator is input to a filter circuit module or the linear buck regulator, and then the output voltage of the linear buck regulator is used as the power supply for the constant current source module.

[0028] Furthermore, the temperature measurement module 4 has a sufficiently large temperature measurement range to detect the error between the broadband light source chip temperature and the set temperature in real time, and within the measurement range, the error has an approximately linear relationship with the output signal of the temperature measurement module.

[0029] Furthermore, the feedback control module 5 includes a feedback control loop, which takes the error signal from the temperature measurement module 4 as input and outputs a voltage signal to drive the cooling (heating) module: when the temperature of the light source die is higher than the set value, the cooling (heating) module is driven to cool the die, and when the temperature of the light source die is lower than the set value, the cooling (heating) module is driven to heat the die.

[0030] Furthermore, in order to reduce power consumption, the output signal of the feedback control module 5 needs to pass through a switching circuit 6 before driving the cooling (heating) module 7.

[0031] All circuit components used are selected in the smallest possible package while meeting functional and performance requirements.

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments and accompanying drawings, but it is obvious that the present invention is not limited to the embodiments described.

[0033] Example 1

[0034] The device includes: SLD light source 1, power supply module 2, constant current source module 3, temperature measurement module 4, feedback control module 5, switching circuit 6, and cooling (heating) module 7.

[0035] The overall scheme of the driving circuit is to keep the current flowing through the SLD light source constant at 400mA and keep the SLD light source die temperature constant at 25 degrees Celsius, so that the output light power of the SLD light source remains stable.

[0036] Power module 2 provides 3V voltage to constant current source module 3, and constant current source module 3 generates a constant 400mA current that is injected into the SLD light source to excite the SLD to emit broadband light.

[0037] Temperature measurement module 4 uses a thermistor bridge to detect the SLD light source chip temperature in real time and transmits the detection information to feedback control module 5. Feedback control module 5 generates a control signal through a PID closed-loop feedback control loop. This control signal then passes through switching circuit 6 to drive TEC cooling (heating) module 7 to cool or heat the SLD light source chip. The temperature control process is shown in the appendix. Figure 2 .

[0038] Furthermore, in order to reduce power consumption, the power supply module 2 uses a high common-mode rejection ratio and low noise switching buck regulator circuit: the output voltage of the switching buck regulator circuit turns on the light source diode and meets the normal operation of the constant current source module 3, avoiding heat loss.

[0039] Furthermore, the voltage noise output by the switching buck regulator circuit is relatively large. The switching buck regulator and the linear buck regulator are connected in series: the output of the switching buck regulator is transmitted to a linear buck regulator, and then the output voltage of the linear buck regulator is used as the power supply for the constant current source module 3.

[0040] Furthermore, the temperature measurement module 4 has a temperature measurement range of -40 to 80 degrees Celsius, and it detects the SLD light source chip temperature in real time. Within the measurement range, the temperature and the output signal of the measurement module have an approximately linear relationship. (See attached figure.) Figure 3 .

[0041] Furthermore, the feedback control module 5 includes a PID closed-loop feedback control loop. This loop takes the temperature measurement signal from the temperature measurement module 4 as input and outputs a control voltage signal to drive the TEC cooling (heating) module: when the temperature of the light source die is higher than the set value, the cooling (heating) module is driven to cool the die; when the temperature of the light source die is lower than the set value, the cooling (heating) module is driven to heat the die. The PID control parameters need to be finely tuned according to the cooling (heating) module.

[0042] Furthermore, in order to reduce power consumption, the output signal of the feedback control module 5 needs to pass through a switching circuit 6 and be filtered before driving the TEC cooling (heating) module 7.

[0043] All circuit components used are selected in the smallest possible package while meeting functional and performance requirements.

[0044] The final optical power output of the SLD light source over 10 hours is shown in the appendix. Figure 4 (Measure every half hour).

[0045] Example 2

[0046] The device includes: ASE light source module 1, power supply module 2, constant current source module 3, temperature measurement module 4, feedback control module 5, switching circuit 6, and cooling (heating) module 7.

[0047] The overall scheme of the driving circuit is to keep the current flowing through the ASE light source constant at 350mA and keep the ASE light source die temperature constant at 25 degrees Celsius, so as to keep the emitted light power of the ASE light source stable.

[0048] Power module 2 provides 3V voltage to constant current source module 3, and constant current source module 3 generates a constant 350mA current that is injected into the ASE light source to excite the ASE to emit broadband light.

[0049] Temperature measurement module 4 uses a thermistor bridge to detect the temperature of the ASE light source chip in real time and transmits the detection information to feedback control module 5. Feedback control module 5 controls the signal through PID closed-loop feedback control circuit. After passing through switching circuit 6, the control signal drives cooling (heating) module 7 to cool or heat the ASE light source chip.

[0050] Furthermore, in order to reduce power consumption, the power supply module 2 uses a high common-mode rejection ratio and low noise switching buck regulator circuit: the output voltage of the switching buck regulator circuit turns on the light source diode and meets the normal operation of the constant current source module 3, avoiding heat loss.

[0051] Furthermore, the voltage noise output by the switching buck regulator circuit is relatively large. The switching buck regulator and the LC filter circuit are connected in series: the output voltage of the switching buck regulator is input to an LC filter circuit, and then the output voltage of the LC filter circuit is used as the power supply for the constant current source module 3.

[0052] Furthermore, the temperature measurement module 4 has a temperature measurement range of -40 to 80 degrees Celsius, and it detects the error between the ASE light source chip temperature and the set temperature in real time. Within the measurement range, this error has an approximately linear relationship with the output signal of the temperature measurement module.

[0053] Furthermore, the feedback control module 5 includes a PID closed-loop feedback control loop, which takes the error signal from the temperature measurement module 4 as input and outputs a voltage signal to drive the TEC cooling (heating) module: when the temperature of the light source die is higher than the set value, the cooling (heating) module is driven to cool the die, and when the temperature of the light source die is lower than the set value, the cooling (heating) module is driven to heat the die; the PID control parameters need to be finely tuned according to the cooling (heating) module.

[0054] Furthermore, in order to reduce power consumption, the output signal of the feedback control module 5 needs to pass through a switching circuit 6 and be filtered before driving the TEC cooling (heating) module 7.

[0055] All circuit components used are selected in the smallest possible package while meeting functional and performance requirements.

[0056] This invention proposes a low-power, miniaturized broadband light source driving circuit for resonant fiber optic gyroscopes. Resonant fiber optic gyroscopes based on broadband light sources require light output power of tens to hundreds of milliwatts and spectral stability, thus placing higher demands on the driving circuits. Currently, broadband light source driving circuits suffer from high power consumption, high heat generation, and large size, hindering the improvement of gyroscope accuracy and failing to meet requirements. Therefore, researching low-power, miniaturized broadband light source driving circuits is crucial. This invention addresses these problems by proposing a low-power, miniaturized broadband light source driving circuit suitable for resonant fiber optic gyroscopes, which helps improve gyroscope accuracy.

[0057] The above embodiments are merely two implementations of the present invention. Any other embodiments, modifications, and improvements made under the premise of the present invention are within the protection scope of the present invention. The protection of this invention is subject to the claims.

Claims

1. A low-power, miniaturized broadband light source driving circuit for a resonant fiber optic gyroscope, characterized in that, The driving circuit includes a broadband light source module, a power supply module, a constant current source module, a temperature measurement module, a feedback control module, a switching circuit, and a cooling or heating module. The overall scheme of the driving circuit is to keep the current flowing through the broadband light source constant and keep the temperature of the broadband light source die constant, so as to stabilize the output light power and spectrum of the broadband light source. The temperature measurement module detects the temperature of the broadband light source chip in real time and transmits the detection information to the feedback control module. The feedback control module outputs a control signal through a closed-loop feedback control circuit. This control signal then passes through a switching circuit to drive the cooling or heating module to cool or heat the broadband light source chip.

2. The driving circuit according to claim 1, characterized in that, The power supply module is a switching buck regulator circuit: the output voltage of the switching buck regulator circuit turns on the light source diode and meets the normal operation of the constant current source module, thus avoiding heat loss.

3. The driving circuit according to claim 2, characterized in that, The output voltage of the switching buck regulator circuit has relatively large noise. Usually, the switching buck regulator and the filter circuit module or the linear buck regulator are connected in series: the output voltage of the switching buck regulator is input to the filter circuit or the linear buck regulator, and then the output of the filter circuit or the linear buck regulator is used as the power supply for the constant current source module.

4. The driving circuit according to claim 1, characterized in that, The temperature measurement module detects the error between the broadband light source chip temperature and the set temperature in real time, has a sufficiently large temperature measurement range, and within the measurement range, the temperature and the output signal have a nearly linear relationship.

5. The driving circuit according to claim 1, characterized in that, The feedback control module includes a feedback control loop that takes the temperature signal from the temperature measurement module as input and outputs a voltage signal to drive the cooling or heating module: when the temperature of the light source chip is higher than the set value, the cooling or heating module is driven to cool the chip, and when the temperature of the light source chip is lower than the set value, the cooling or heating module is driven to heat the chip.

6. The driving circuit according to claim 1, characterized in that, The output signal of the feedback control module needs to pass through a switching circuit before driving the cooling or heating module.

7. The driving circuit according to claim 1, characterized in that, All circuit components used are selected in the smallest possible package while meeting functional and performance requirements.

8. The driving circuit according to claim 1, characterized in that, The power module provides power to the constant current source module, which generates a constant current that is injected into the broadband light source, thus exciting the light source to emit broadband light.

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