CN209857911U - Light source driving circuit for optical fiber gyroscope - Google Patents
Light source driving circuit for optical fiber gyroscope Download PDFInfo
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- CN209857911U CN209857911U CN201920419473.3U CN201920419473U CN209857911U CN 209857911 U CN209857911 U CN 209857911U CN 201920419473 U CN201920419473 U CN 201920419473U CN 209857911 U CN209857911 U CN 209857911U
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Abstract
The utility model relates to a light source drive circuit for fiber-optic gyroscope, including constant current source circuit, temperature control circuit and light source, constant current source circuit and temperature control circuit all are connected with the light source, and temperature control circuit includes bridge circuit, control by temperature change chip and PID compensation network, and the control by temperature change chip internal integration has first reference voltage and CMOS transistor, control by temperature change chip respectively with bridge circuit, light source and PID compensation network connection. Compared with the prior art, the utility model discloses an internal integration has the control by temperature change chip of first reference voltage and CMOS transistor, and the integrated level is high, can avoid a great deal of problem that three device timing leads to, has also improved the reliability of product simultaneously.
Description
Technical Field
The utility model relates to a light source drive circuit especially relates to a light source drive circuit for fiber optic gyroscope.
Background
The optical fiber gyroscope is an angular rate sensor and is a main sensor for determining the spatial motion attitude of a moving body. Can be applied to various fields such as sea, land, air and space. The light source driving circuit is used as an important active optical device in the optical fiber gyroscope, a high-precision constant current source circuit and a temperature control circuit are required to be driven simultaneously when the optical fiber gyroscope works normally, the reference voltage, the temperature control chip and the CMOS transistor of the temperature control circuit of the existing light source driving circuit are three independent components, the three components need to be adjusted, and the like, and faults are easy to occur in practical application.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a light source driving circuit for a fiber optic gyroscope, which overcomes the above-mentioned drawbacks of the prior art.
The purpose of the utility model can be realized through the following technical scheme:
the utility model provides a light source drive circuit, includes constant current source circuit, temperature control circuit and light source, constant current source circuit and temperature control circuit all are connected with the light source, temperature control circuit includes bridge circuit, control by temperature change chip and PID compensation network, the integrated first reference voltage and CMOS transistor that have in the control by temperature change chip, the control by temperature change chip respectively with bridge circuit, light source and PID compensation network connection.
The temperature control chip is MAX 1978.
The constant current source circuit comprises a second reference voltage, an operational amplifier, a power chip and a focusing transistor, wherein the second reference voltage, the operational amplifier and the focusing transistor are sequentially connected, the focusing transistor is connected with a light source, and the power chip is connected with the light source.
The focusing transistor is a triode.
The model of the second reference voltage is F431.
The power supply chip is GED1963ST223-3P 3.
Compared with the prior art, the utility model discloses following beneficial effect has:
1) the temperature control chip internally integrated with the first reference voltage and the CMOS transistor is adopted, the integration level is high, a plurality of problems caused by adjustment and correction of three devices can be avoided, and meanwhile, the reliability of the product is improved.
2) The temperature control chip is MAX1978, the model of the second reference voltage is F431, and the zero-offset stability of the assembled fiber-optic gyroscope can reach 0.1 degree/h.
Drawings
FIG. 1 is a schematic diagram of a constant current source circuit;
FIG. 2 is a schematic diagram of a conventional temperature control circuit;
FIG. 3 is a schematic diagram of a temperature control circuit of the present application;
FIG. 4 is a schematic diagram of a bridge;
fig. 5 is a schematic diagram of a PID compensation network.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
A light source driving circuit comprises a constant current source circuit, a temperature control circuit and a light source, wherein the constant current source circuit and the temperature control circuit are connected with the light source,
as shown in fig. 2, the reference voltage of the conventional temperature control circuit uses an ADR421 chip, the temperature control chip uses ADN8830, the temperature control chip and the light source are controlled by 2 integrated CMOS chips (e.g., IRF7319), and a bridge circuit and a PID compensation network are arranged around the temperature control chip. All chips used in the circuit are imported devices, and the reference voltage, the temperature control chip and the CMOS transistor are three independent parts, so that the three parts need to be adjusted and calibrated, and the like, and faults are easy to occur in practical application
In this application, as shown in fig. 3, the temperature control circuit includes a bridge circuit, a temperature control chip, a PID compensation network, and a peripheral resistor, a capacitor, and an inductor set, a first reference voltage and a CMOS transistor are integrated in the temperature control chip, and the temperature control chip is connected to the bridge circuit, the light source, and the PID compensation network, respectively. The temperature control chip is MAX1978, the bridge circuit is shown in figure 4 and is composed of 3 high-precision resistors and thermistors with negative temperature coefficients, the PID compensation network is a proportional-integral-derivative control circuit, the existing circuit shown in figure 5 is adopted, and the temperature control chip is composed of a peripheral resistance-capacitance network and an internal chopper amplifier integrated to MAX 1978. Wherein, R3, C2 and C3 control the integral parameter of the system to eliminate the deviation of the system, R1, R2 and C1 control the differential parameter of the system, the differential control can reduce the overshoot, overcome the oscillation, improve the stability of the system, accelerate the dynamic response speed of the system and reduce the adjusting time, thereby improving the dynamic performance of the system. The selection of the peripheral circuit may be kept consistent with the existing ones, and is a routine choice for those skilled in the art, and thus will not be described in detail.
In addition, as shown in fig. 1, the constant current source circuit includes a second reference voltage, an operational amplifier, a power supply chip, a focusing transistor, a peripheral resistor, a capacitor, and an inductor, the second reference voltage, the operational amplifier, and the focusing transistor are connected in sequence, the focusing transistor is connected to the light source, and the power supply chip is connected to the light source.
The focusing transistor is a triode, the specific model is GBC817-16, the model of the second reference voltage is F431, the power supply chip is GED1963ST223-3P3, and the chip used by the operational amplifier is F2277U. The zero-offset stability of the optical fiber gyroscope assembled by the circuit can reach 0.1 degree/h.
Claims (6)
1. The utility model provides a light source drive circuit, includes constant current source circuit, temperature control circuit and light source, constant current source circuit and temperature control circuit all are connected with the light source, its characterized in that, temperature control circuit includes bridge circuit, control by temperature change chip and PID compensation network, integrated first reference voltage and CMOS transistor in the control by temperature change chip, the control by temperature change chip respectively with bridge circuit, light source and PID compensation network connection.
2. The light source driving circuit according to claim 1, wherein the temperature control chip is MAX 1978.
3. The light source driving circuit according to claim 1, wherein the constant current source circuit comprises a second reference voltage, an operational amplifier, a power chip and a focusing transistor, the second reference voltage, the operational amplifier and the focusing transistor are sequentially connected, the focusing transistor is connected to the light source, and the power chip is connected to the light source.
4. The light source driving circuit according to claim 3, wherein the focusing transistor is a triode.
5. The light source driving circuit according to claim 3, wherein the second reference voltage is F431.
6. The light source driving circuit according to claim 3, wherein the power chip is GED1963ST223-3P 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920419473.3U CN209857911U (en) | 2019-03-29 | 2019-03-29 | Light source driving circuit for optical fiber gyroscope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920419473.3U CN209857911U (en) | 2019-03-29 | 2019-03-29 | Light source driving circuit for optical fiber gyroscope |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209857911U true CN209857911U (en) | 2019-12-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920419473.3U Active CN209857911U (en) | 2019-03-29 | 2019-03-29 | Light source driving circuit for optical fiber gyroscope |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209857911U (en) |
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2019
- 2019-03-29 CN CN201920419473.3U patent/CN209857911U/en active Active
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Address after: 201801 1a, 1b, 1C2, 2A3, 3A4, 4A5, 5A6, 6a, building 1, No. 618, Chengliu Middle Road, Jiading District, Shanghai Patentee after: Shanghai Aoshi Control Technology Co., Ltd Address before: 201801 1a, 1b, 1C2, 2A3, 3A4, 4A5, 5A6, 6a, building 1, No. 618, Chengliu Middle Road, Jiading District, Shanghai Patentee before: SHANGHAI HENGTONG PHOTOELECTRIC TECHNOLOGY Co.,Ltd. |