Servo and IF integrated circuit of accelerometer

Abstract

The invention discloses an accelerometer servo and IF integrated circuit, and relates to the field of electronics, the accelerometer servo and IF integrated circuit comprises an accelerometer servo circuit unit, an I / F conversion circuit unit and a power supply conversion unit, and the accelerometer servo circuit unit is composed of a two-way voltage stabilizing circuit, a pre-amplification conversion integrated circuit, a transconductance compensation amplification integrated circuit and a feedback correction network. According to the accelerometer servo and IF integrated circuit, a single-channel I / F conversion function is added in an existing phi 25.5 mm accelerometer servo circuit, pulse digital output of the accelerometer servo circuit is achieved, the accuracy of an accelerometer conversion channel is guaranteed, meanwhile, an I / F conversion circuit existing as an independent functional circuit in a traditional inertial navigation system can be omitted, and the cost is reduced. The accelerometer servo and IF integrated circuit provides important support for miniaturization of an inertial navigation system, so that the accelerometer servo and IF integrated circuit solves the problem that the power consumption of an I / F converter of a used model is 1.3 W and accounts for about 75% of the total power consumption of a product, and consequently heating is obvious.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, specifically an integrated circuit for accelerometer servo and IF. Background Art

[0002] In an inertial navigation system (hereinafter referred to as "INS"), a quartz flexible accelerometer (hereinafter referred to as "accelerometer") is a sensor for measuring the linear acceleration of a vehicle. It can convert the linear acceleration of the vehicle into a proportional current signal, and the I / F conversion circuit linearly converts this current signal into a pulse frequency signal for providing to a navigation computer. After navigation calculation, the displacement information of the vehicle can be obtained. The accuracy of the accelerometer and the I / F conversion circuit directly affects the navigation accuracy of the INS. Since the INS needs to measure the linear accelerations of three spatial axes, generally 3 accelerometers and a 3-channel I / F conversion circuit are required for an INS.

[0003] Currently, the output of the accelerometer servo circuit and the I / F conversion circuit produced is an analog signal output. In order to match with a digital measurement system, it is necessary to convert the analog signal output into a digital signal processed by a computer through an I / F conversion chip. The total power consumption of the integrated circuit for accelerometer servo and I / F is about 1.73 W, and the power consumption of the used type of I / F converter is 1.3 W, accounting for about 75% of the total power consumption of the product. Therefore, the used type of I / F converter generates obvious heat. Summary of the Invention

[0004] The purpose of the present invention is to provide an integrated circuit for accelerometer servo and IF, so as to solve the problem in the above background art that the power consumption of the used type of I / F converter is 1.3 W, accounting for about 75% of the total power consumption of the product, resulting in obvious heat generation.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An integrated circuit for accelerometer servo and IF, including an accelerometer servo circuit unit, an I / F conversion circuit unit, and a power conversion unit. The accelerometer servo circuit unit is composed of a dual-channel voltage stabilizing circuit, a preamplifier transformation integrated circuit, a transconductance compensation amplifier integrated circuit, and a feedback correction network. The I / F conversion circuit unit is composed of an I / F conversion circuit integrated circuit, a clock input, and a current input. The power conversion unit is composed of a BUCK-type step-down converter and a BUCK-type negative voltage step-down converter.

[0006] Preferably, the dual - voltage - stabilizing circuit is electrically connected to the input ends of R10 of 681 and R11 of 681 through - 15V and + 15V respectively. The output ends of R10 of 681 and R11 of 681 are electrically connected to the 15th pin and the 5th pin of the pre - amplification conversion integrated circuit. The 9th pin of the pre - amplification conversion integrated circuit is electrically connected to the 8th pin of the transconductance compensation amplification integrated circuit through C7 of 560. The 3rd pin, 4th pin and 7th pin of the transconductance compensation amplification integrated circuit are grounded. The 1st pin of the transconductance compensation amplification integrated circuit is electrically connected to the 6th pin of the pre - amplification conversion integrated circuit through the feedback correction network. The 2nd pin of the transconductance compensation amplification integrated circuit is electrically connected to the 7th pin of the amplification conversion integrated circuit. The 6th pin of the transconductance compensation amplification integrated circuit is electrically connected to T3 through C11 of 103. T4 is respectively electrically connected to C10 of 473 and IF_IN, and C10 of 473 and IF_IN are in parallel.

[0007] Preferably, the 13th pin and 14th pin of the pre - amplification conversion integrated circuit are respectively electrically connected to T1 and T2. The 8th pin and 12th pin of the pre - amplification conversion integrated circuit are electrically connected. The 11th pin of the pre - amplification conversion integrated circuit is electrically connected to the input end of C2 of 102. The output end of C2 is grounded. The 3rd pin and 4th pin of the pre - amplification conversion integrated circuit are electrically connected through R3 of 393. The 1st pin of the pre - amplification conversion integrated circuit is electrically connected to the input end of R4 of 392. The 16th pin of the pre - amplification conversion integrated circuit is connected in parallel with the 10th pin through C1 of 750 and then in series with the output end of R4 of 392. The output end of R4 is grounded.

[0008] Preferably, the input end of the I / F conversion circuit integrated circuit is electrically connected to the U1 board. The clock input is electrically connected to the U1 board through the third pin. One end of the U1 board close to the 3rd pin and the end far from the 3rd pin are both grounded. IF_IN is connected to the input ends of R1 and S1. The output ends of R1 and S1 are electrically connected to the pin of the U1 board through a 0.22uF capacitor. The 4th pin of the clock input is electrically connected to VDD with an input of 5V, and the 4th pin of the clock input is grounded through C1 of 0.1uF.

[0009] Preferably, the VIN pin of the BUCK step-down converter is connected in parallel with an R1 of 100K and then in series with the VIN pin and SHND pin of the BUCK step-down negative voltage converter. The VIN pin and SHND pin of the BUCK step-down negative voltage converter are in a parallel state. The input of the VIN pin of the BUCK step-down converter is +15V. The B8I pin of the BUCK step-down converter is connected in parallel with the SW pin through a C2 of 100uF and then in series with an L1 of 4.7uH. The output of L1 is +5V. The FBa pin of the BUCK step-down converter is connected in series with a C3 of 10uF and the GND pin through an R3 of 16K and an R2 of 3K respectively and then in parallel. The 4.7uH L1 is connected in parallel with the 16K R3 and then in series with the 10uF C3. The output terminal of the 10uF C3 is grounded.

[0010] Preferably, the VIN pin and SHND pin of the BUCK step-down negative voltage converter are connected in parallel and then in series with the input end of an L2 of 10uH. The output end of L2 is connected in series with the 8W pin and the input end of a C4 of 1uF respectively. The output end of the 1uF C4 is connected in series with the D1 of the MBR0520 and the input end of an L3 of 10uH respectively. The NFB pin of the BUCK step-down negative voltage converter is connected in series with the input ends of R4, an R5 of 10K and a C5 of 2202pF respectively. The output ends of R4 and the 2202pF C5 are connected in parallel and then in series with the input end of a C6 of 10uF and in parallel with the output end of the 10uH L3. The output ends of the 10uF C6, the D1 of the MBR0520, the 10K R5, the GND pin and the 10uF C1 are grounded.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: In the accelerometer servo and IF integrated circuit, a single-channel I / F conversion function is added to the existing accelerometer servo circuit with a diameter of Ф25.5mm to realize the pulse digital output of the accelerometer servo circuit. While ensuring the accuracy of the accelerometer conversion channel, the I / F conversion circuit existing as an independent functional circuit in the traditional inertial navigation system can be omitted, providing important support for the miniaturization of the inertial navigation system, and solving the problem that the power consumption of the used model I / F converter is 1.3W, accounting for about 75% of the total power consumption of the product, resulting in obvious heating. Description of the Drawings

[0012] Figure 1 It is the integrated circuit flow chart of the present invention; Figure 2 It is the power conversion circuit diagram of the present invention; Figure 3 It is the accelerometer servo circuit diagram of the present invention; Figure 4 It is the I / F conversion circuit diagram of the present invention.

[0013] In the figure: 1. Accelerometer servo circuit unit; 2. I / F conversion circuit unit; 3. Power conversion unit; 11. Dual-channel voltage stabilization circuit; 12. Preamplifier transformation integrated circuit; 13. Transconductance compensation amplifier integrated circuit; 14. Feedback correction network; 21. I / F conversion circuit integrated circuit; 22. Clock input; 23. Current input; 31. BUCK-type step-down converter; 32. BUCK-type negative voltage step-down converter. Detailed implementation mode

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0015] Please refer to Figures 1-4 , the present invention provides a technical solution: an accelerometer servo and IF integrated circuit, including an accelerometer servo circuit unit 1, an I / F conversion circuit unit 2, and a power conversion unit 3. The accelerometer servo circuit unit 1 is composed of a dual-channel voltage stabilization circuit 11, a preamplifier transformation integrated circuit 12, a transconductance compensation amplifier integrated circuit 13, and a feedback correction network 14. The I / F conversion circuit unit 2 is composed of an I / F conversion circuit integrated circuit 21, a clock input 22, and a current input 23. The power conversion unit 3 is composed of a BUCK-type step-down converter 31 and a BUCK-type negative voltage step-down converter 32.

[0016] The dual-channel voltage stabilization circuit 11 is electrically connected to the input ends of R10 of 681 and R11 of 681 through -15v and +15v respectively. The output ends of R10 of 681 and R11 of 681 are electrically connected to the 15th pin and the 5th pin of the preamplifier transformation integrated circuit 12. The 9th pin of the preamplifier transformation integrated circuit 12 is electrically connected to the 8th pin of the transconductance compensation amplifier integrated circuit 13 through C7 of 560. The 3rd pin, the 4th pin, and the 7th pin of the transconductance compensation amplifier integrated circuit 13 are grounded. The 1st pin of the transconductance compensation amplifier integrated circuit 13 is electrically connected to the 6th pin of the preamplifier transformation integrated circuit 12 through the feedback correction network 14. The 2nd pin of the transconductance compensation amplifier integrated circuit 13 is electrically connected to the 7th pin of the amplifier transformation integrated circuit 12. The 6th pin of the transconductance compensation amplifier integrated circuit 13 is electrically connected to T3 through C11 of 103. T4 is respectively electrically connected to C10 of 473 and IF_IN, and C10 of 473 and IF_IN are in parallel.

[0017] The 13th pin and the 14th pin of the preamplifier conversion integrated circuit 12 are electrically connected to T1 and T2 respectively. The 8th pin and the 12th pin of the preamplifier conversion integrated circuit 12 are electrically connected. The 11th pin of the preamplifier conversion integrated circuit 12 is electrically connected to the input end of C2 of 102. The output end of C2 is grounded. The 3rd pin and the 4th pin of the preamplifier conversion integrated circuit 12 are electrically connected through R3 of 393. The 1st pin of the preamplifier conversion integrated circuit 12 is electrically connected to the input end of R4 of 392. The 16th pin of the preamplifier conversion integrated circuit 12 is connected in parallel with the 10th pin through C1 of 750 and then connected in series with the output end of R4 of 392. The output end of R4 is grounded.

[0018] The input end of the I / F conversion circuit integrated circuit 21 is electrically connected to the U1 board. The clock input 22 is electrically connected to the U1 board through the third pin. One end of the U1 board close to the 3rd pin and the end far from the 3rd pin are both grounded. IF_IN is connected to the input ends of R1 and S1. The output ends of R1 and S1 are electrically connected to the pin of the U1 board through a 0.22uF capacitor. The 4th pin of the clock input 22 is electrically connected to VDD with an input of 5v, and the 4th pin of the clock input 22 is grounded through C1 of 0.1uF.

[0019] The VIN pin of the BUCK buck converter 31 is connected in parallel with R1 of 100K and then connected in series with the VIN pin and the SHND pin of the BUCK negative voltage converter 32. And the VIN pin and the SHND pin of the BUCK negative voltage converter 32 are in a parallel state. The input of the VIN pin of the BUCK buck converter 31 is +15V. The B8I pin of the BUCK buck converter 31 is connected in parallel with the SW pin through C2 of 100uF and then connected in series with L1 of 4.7uH. And the output of L1 is +5v. The FBa pin of the BUCK buck converter 31 is respectively connected in series with C3 of 10uF and the GND pin through R3 of 16K and R2 of 3K and then in parallel. And L1 of 4.7uH is connected in parallel with R3 of 16K and then connected in series with C3 of 10uF. The output end of C3 of 10uF is grounded.

[0020] The VIN pin and the SHND pin of the BUCK step-down voltage converter 32 are connected in parallel and then connected in series with the input end of the 10 uH inductor L2. The output end of the inductor L2 is respectively connected in series with the 8W pin and the input end of the 1 uF capacitor C4. The output end of the 1 uF capacitor C4 is respectively connected in series with the D1 of the MBR0520 and the input end of the 10 uH inductor L3. The NFB pin of the BUCK step-down voltage converter 32 is respectively connected in series with the resistor R4, the 10K resistor R5 and the input end of the 2202 pF capacitor C5. The output ends of the resistor R4 and the 2202 pF capacitor C5 are connected in parallel and then connected in series with the input end of the 10 uF capacitor C6 and are also connected in parallel with the output end of the 10 uH inductor L3. The output ends of the 10 uF capacitor C6, the D1 of the MBR0520, the 10K resistor R5, the GND pin and the 10 uF capacitor C1 are grounded.

[0021] In specific implementation, to reduce the total power consumption of the product, an I / F conversion circuit unit 2 is added to the existing accelerometer servo circuit with a diameter of Ф25.5 mm. The I / F conversion circuit unit 2 can implement the single-channel I / F conversion function through the I / F conversion circuit integrated circuit 21, realizing the pulse digital output of the accelerometer servo circuit in the accelerometer servo circuit unit 1. While ensuring the accuracy of the accelerometer conversion channel, the I / F conversion circuit existing as an independent functional circuit in the traditional inertial navigation system can be omitted, providing important support for the miniaturization of the inertial navigation system. And a clock input 22 and a separate current input 23 are provided inside the I / F conversion circuit unit 2, which is more stable and convenient to control. This accelerometer servo and IF integrated circuit is provided with an I / F conversion circuit unit 2 and adopts the single-channel I / F conversion function, effectively reducing the total energy consumption of the product and reducing heat dissipation.

[0022] In summary, when using this accelerometer servo and IF integrated circuit, the dual-channel voltage stabilizing circuit 11 provides a stable operating voltage for the preamplifier conversion integrated circuit 12 to make it work. The preamplifier conversion integrated circuit 12 integrates a triangular wave generator, a differential capacitance detector, an integrator, and a preamplifier circuit. When the accelerometer sensor senses acceleration, the quartz pendulum plate deviates from the central position, so the capacitance value of the differential capacitance sensor changes, and the differential capacitance detection terminal outputs a DC current proportional to the input acceleration. This current passes through the integrator and the transconductance compensation amplifier integrated circuit 13, that is, the transconductance compensation amplifier, to provide an accurate rebalancing current for the torque motor to keep the assembly in a force balance state. Among them, the parameters of the feedback correction network 14 directly affect the dynamic characteristics of the system. The function of the I / F conversion circuit unit 2 is to linearly convert the current signal output by the accelerometer servo circuit unit 1 into a pulse frequency signal to achieve digital output. The operating voltage of this circuit unit is ±5V. Therefore, it is necessary for the power conversion unit 3 to convert the ±15V power supply into ±5V through the BUCK-type step-down converter 31 and the BUCK-type negative voltage step-down converter 32 to supply power to it. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0023] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Accelerometer servo and IF integrated circuit, comprising an accelerometer servo circuit unit (1), an I / F conversion circuit unit (2), and a power conversion unit (3), characterized in that: The accelerometer servo circuit unit (1) consists of a dual-channel voltage stabilization circuit (11), a preamplification and transformation integrated circuit (12), a transconductance compensation amplification integrated circuit (13), and a feedback correction network (14). The I / F conversion circuit unit (2) consists of an I / F conversion circuit integrated circuit (21), a clock input (22), and a current input (23). The power conversion unit (3) consists of a BUCK-type step-down converter (31) and a BUCK-type negative step-down converter (32).

2. The accelerometer servo and IF integrated circuit according to claim 1, characterized in that: The dual-channel voltage stabilization circuit (11) is electrically connected to the input ends of R10 of 681 and R11 of 681 through -15v and +15v respectively. The output ends of R10 of 681 and R11 of 681 are electrically connected to the 15th pin and the 5th pin of the preamplification and transformation integrated circuit (12). The 9th pin of the preamplification and transformation integrated circuit (12) is electrically connected to the 8th pin of the transconductance compensation amplification integrated circuit (13) through C7 of 560. The 3rd pin, 4th pin, and 7th pin of the transconductance compensation amplification integrated circuit (13) are grounded. The 1st pin of the transconductance compensation amplification integrated circuit (13) is electrically connected to the 6th pin of the preamplification and transformation integrated circuit (12) through the feedback correction network (14). The 2nd pin of the transconductance compensation amplification integrated circuit (13) is electrically connected to the 7th pin of the amplification and transformation integrated circuit (12). The 6th pin of the transconductance compensation amplification integrated circuit (13) is electrically connected to T3 through C11 of 103. T4 is respectively electrically connected to C10 of 473 and IF_IN, and C10 of 473 and IF_IN are in parallel.

3. The accelerometer servo and IF integrated circuit according to claim 2, wherein: The 13th pin and 14th pin of the preamplification and transformation integrated circuit (12) are respectively electrically connected to T1 and T2. The 8th pin and 12th pin of the preamplification and transformation integrated circuit (12) are electrically connected. The 11th pin of the preamplification and transformation integrated circuit (12) is electrically connected to the input end of C2 of 102. The output end of C2 is grounded. The 3rd pin and 4th pin of the preamplification and transformation integrated circuit (12) are electrically connected through R3 of 393. The 1st pin of the preamplification and transformation integrated circuit (12) is electrically connected to the input end of R4 of 392. The 16th pin of the preamplification and transformation integrated circuit (12) is connected in parallel with the 10th pin through C1 of 750 and then connected in series with the output end of R4 of 392. The output end of R4 is grounded.

4. The accelerometer servo and IF integrated circuit according to claim 1, characterized in that: The input terminal of the I / F conversion circuit integrated circuit (21) is electrically connected to the U1 board. The clock input (22) is electrically connected to the U1 board through the third pin. One end of the U1 board close to the third pin and the end far from the third pin are both grounded. IF_IN is connected to the input terminals of R1 and S1. The output terminals of R1 and S1 are electrically connected to the pins of the U1 board through a 0.22 uF capacitor. The fourth pin of the clock input (22) is electrically connected to VDD with an input of 5V, and the fourth pin of the clock input (22) is grounded through a 0.1 uF C1.

5. The accelerometer servo and IF integrated circuit according to claim 1, characterized in that: The VIN pin of the BUCK step-down converter (31) is connected in parallel with R1 of 100K and then in series with the VIN pin and SHND pin of the BUCK step-down negative voltage converter (32). The VIN pin and SHND pin of the BUCK step-down negative voltage converter (32) are in a parallel state. The input of the VIN pin of the BUCK step-down converter (31) is +15V. The B8I pin of the BUCK step-down converter (31) is connected in parallel with the SW pin through a 100 uF C2 and then in series with a 4.7 uH L1. The output of L1 is +5V. The FBa pin of the BUCK step-down converter (31) is respectively connected in series with a 16K R3 and a 3K R2 and then in parallel with a 10 uF C3 and the GND pin. The 4.7 uH L1 is connected in parallel with the 16K R3 and then in series with the 10 uF C3. The output terminal of the 10 uF C3 is grounded.

6. The accelerometer servo and IF integrated circuit according to claim 5, characterized in that: The VIN pin and SHND pin of the BUCK step-down negative voltage converter (32) are connected in parallel and then in series with the input terminal of a 10 uH L2. The output terminal of L2 is respectively connected in series with the 8W pin and the input terminal of a 1 uF C4. The output terminal of the 1 uF C4 is respectively connected in series with D1 of MBR0520 and the input terminal of a 10 uH L3. The NFB pin of the BUCK step-down negative voltage converter (32) is respectively connected in series with R4, a 10K R5 and the input terminal of a 2202 pF C5. The output terminals of R4 and the 2202 pF C5 are connected in parallel and then in series with the input terminal of a 10 uF C6 and are connected in parallel with the output terminal of the 10 uH L3. The output terminals of the 10 uF C6, D1 of MBR0520, the 10K R5, the GND pin and the 10 uF C1 are grounded.

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