WO2011102063A1 - 振動型慣性力センサ - Google Patents
振動型慣性力センサ Download PDFInfo
- Publication number
- WO2011102063A1 WO2011102063A1 PCT/JP2010/073718 JP2010073718W WO2011102063A1 WO 2011102063 A1 WO2011102063 A1 WO 2011102063A1 JP 2010073718 W JP2010073718 W JP 2010073718W WO 2011102063 A1 WO2011102063 A1 WO 2011102063A1
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- WIPO (PCT)
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- circuit
- signal
- gain
- inertial force
- vibrator
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/56—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/56—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
- G01C19/5776—Signal processing not specific to any of the devices covered by groups G01C19/5607 - G01C19/5719
Definitions
- the present invention relates to an inertial force sensor that detects an inertial force, and more particularly, to a vibration-type inertial force sensor that detects an inertial force using a vibrator.
- the vibration type inertial force sensor is used as, for example, an angular velocity sensor that detects an angular velocity based on the inertial force.
- the vibration type inertial force sensor includes a vibrator for detecting an angular velocity, an oscillation circuit section that supplies a drive signal to the vibrator, and a detection circuit section that detects the angular velocity of the vibrator.
- the vibrator includes an electrostatic drive / capacitance detection type, a piezoelectric drive / piezoelectric detection type, and the like.
- the vibrator includes a vibrating body that vibrates at an angular velocity, a driving unit that drives the vibrating body, a monitoring unit that feeds back a monitor signal corresponding to the amplitude of the vibrating body (vibration state of the vibrator) to the oscillation circuit unit, and the vibrating body
- the detection means which outputs the detection signal based on the vibration displacement by the Coriolis force of this is provided.
- the oscillation circuit unit is configured as a closed-loop self-excited oscillation circuit using a vibrator as a resonance element, generates a drive signal from a monitor signal corresponding to the amplitude of the vibrator, and supplies the drive signal to the vibrator. Control the vibration of the vibrating body.
- the detection circuit unit generates and outputs an angular velocity detection signal based on the detection signal input from the vibrator detection means.
- the angular velocity detection signal is a DC voltage corresponding to the magnitude of the angular velocity of the vibrator.
- the vibration type inertial force sensor cannot detect the angular velocity during the period from when the power is turned on until the amplitude of the vibrating body reaches a predetermined magnitude.
- the vibration-type inertial force sensor is desired to shorten the start-up time from when the power is turned on until the angular velocity can be detected.
- Patent Document 1 discloses a vibration-type inertial force sensor that can shorten the start-up time. Is disclosed.
- the vibration-type inertial force sensor disclosed in Patent Document 1 includes a voltage amplifier inside a variable gain amplifier circuit (VGA circuit) that constitutes an automatic gain control circuit (AGC circuit) or after the VGA circuit. Further, the voltage amplifier has switch means for switching the amplification factor (gain) according to the voltage level of the monitor signal.
- VGA circuit variable gain amplifier circuit
- AGC circuit automatic gain control circuit
- the monitor signal is amplified by the VGA circuit until the amplitude of the vibrating body becomes a predetermined magnitude after the power is turned on, and the angular velocity of the vibrator can be detected. I have to. Therefore, it is possible to shorten the startup time of the vibration type inertial force sensor by increasing the amplification factor of the VGA circuit.
- the conventional vibration type inertial force sensor has a problem that the start-up time can be shortened only within the gain variable range that the VGA circuit originally has the gain of the VGA circuit.
- the present invention has been made in view of the above circumstances, and the startup time from when the power is turned on until the inertial force (angular velocity) can be detected without causing the operation of the automatic gain control circuit to become unstable. It is an object of the present invention to provide a vibration type inertial force sensor capable of shortening.
- a vibration type inertial force sensor includes a vibrator that detects inertial force, an oscillation circuit that supplies a drive signal to the vibrator, and detects inertial force of the vibrator.
- a detection circuit unit that functions as a closed-loop self-excited oscillation circuit using the vibrator as a resonance element, and a monitor signal based on a capacitance according to a vibration state of the vibrator,
- a signal conversion circuit that converts a monitor signal based on a voltage corresponding to an amount of change in capacitance, a gain is controlled based on the monitor signal converted by the signal conversion circuit, and the drive signal is generated.
- an automatic gain control circuit for supplying the vibrator, and the signal conversion circuit has amplification means for amplifying the monitor signal at a predetermined amplification rate for a predetermined period after the power is turned on.
- a vibration-type inertial force sensor including a vibrator, an oscillation circuit section, and a detection circuit section
- the oscillation circuit section functions as a closed-loop self-excited oscillation circuit using the vibrator as a resonance element.
- the signal conversion circuit that converts the monitor signal based on the capacitance according to the vibration state of the signal into the monitor signal based on the voltage corresponding to the change amount of the capacitance, and the gain is controlled based on the monitor signal converted by the signal conversion circuit
- an automatic gain control circuit for generating a drive signal and supplying the drive signal to the vibrator.
- the signal conversion circuit has amplification means for amplifying the monitor signal at a predetermined amplification factor for a predetermined period after the power is turned on, the greatly amplified monitor signal is supplied to the vibrator as a drive signal to vibrate the vibrator.
- the start-up time from when the state is greatly changed until the inertial force can be detected after the power is turned on can be shortened.
- the automatic gain control circuit has a variable gain range of the variable gain amplification circuit (a gain variable range inherent in the VGA circuit). An automatic gain control circuit that can be used and has stable operation and high accuracy can be realized.
- the vibration type inertial force sensor according to a second aspect of the present invention is the vibration type inertial force sensor according to the first aspect, wherein the signal conversion circuit is composed of an operational amplifier circuit having a feedback capacitor, and the amplifying means is turned on for a predetermined period after the power is turned on.
- the monitor signal is amplified by switching the magnitude of the feedback capacitor.
- the signal conversion circuit is composed of an operational amplifier circuit having a feedback capacity
- the amplification means amplifies the monitor signal by switching the magnitude of the feedback capacity for a predetermined period after the power is turned on.
- a greatly amplified monitor signal is supplied as a drive signal to the vibrator to greatly change the vibration state of the vibrator, and the startup time from when the power is turned on until the inertial force can be detected can be shortened.
- the gain of the amplifier circuit included in the automatic gain control circuit controls the gain of the automatic gain control circuit during the predetermined period.
- the gain based on the control signal is an amplification factor of the amplifier circuit within a range in which the gain changes with respect to the change of the control signal after power is turned on. This is a period that is less than or equal to the maximum gain.
- the control signal when the gain of the amplifier circuit included in the automatic gain control circuit has a negative characteristic with respect to the control signal for controlling the gain of the automatic gain control circuit, the control signal changes after the power is turned on.
- the period during which the gain based on the control signal is less than or equal to the maximum gain of the amplification circuit within a range in which the gain changes as a predetermined period, it is possible to prevent the automatic gain control circuit from decreasing in gain.
- the gain of the amplifier circuit included in the automatic gain control circuit controls the gain of the automatic gain control circuit during the predetermined period.
- the gain based on the control signal is an amplification factor of the amplifier circuit in a range in which the gain changes with respect to the change of the control signal after power is turned on. This is a period that exceeds the maximum gain.
- the control signal when the gain of the amplifier circuit included in the automatic gain control circuit has a positive characteristic with respect to the control signal for controlling the gain of the automatic gain control circuit, the control signal changes after the power is turned on.
- the period during which the gain based on the control signal is equal to or greater than the maximum gain of the amplification circuit within a range in which the gain changes as a predetermined period, it is possible to prevent the automatic gain control circuit from reducing the gain.
- the vibration type inertial force sensor according to a fifth aspect of the present invention is the vibration type inertial force sensor according to any one of the second to fourth aspects of the present invention, wherein the amplifying means controls the feedback based on a control signal for controlling the gain of the automatic gain control circuit. Switch the size of the capacity.
- the amplifying means switches the magnitude of the feedback capacitance based on the control signal for controlling the gain of the automatic gain control circuit. Therefore, the switching timing is arbitrarily set by the magnitude of the control signal, and the power supply is turned on. It is possible to shorten the start-up time from when the power is supplied until the inertial force can be detected.
- the switching timing is set in a period in which the gain based on the control signal is less than or equal to the maximum gain of the gain of the amplifier circuit. Thus, the gain of the automatic gain control circuit can be prevented from becoming small.
- the gain based on the control signal is equal to the amplification factor of the amplification circuit. It is possible to prevent the gain of the automatic gain control circuit from being reduced by setting the switching timing during the period when the gain is equal to or greater than the maximum gain.
- the vibration type inertial force sensor is the vibration type inertial force sensor according to the fifth aspect of the present invention, wherein the feedback capacitor includes a first feedback capacitor and a second feedback capacitor, and the first feedback capacitor is always connected to the operational amplifier circuit.
- the second feedback capacitor is at least one capacitor connected to the operational amplifier circuit based on the control signal.
- the first feedback capacitor is a capacitor that is always connected to the operational amplifier circuit
- the second feedback capacitor is at least one capacitor that is connected to the operational amplifier circuit based on the control signal.
- a vibration type inertial force sensor is a vibration type inertial force sensor including a vibrator, an oscillation circuit unit, and a detection circuit unit.
- the oscillation circuit unit is a self-oscillation of closed loop using the vibrator as a resonance element.
- a signal conversion circuit that functions as a circuit and converts a monitor signal based on the capacitance according to the vibration state of the vibrator into a monitor signal based on a voltage corresponding to the amount of change in the capacitance, and the signal conversion circuit.
- An automatic gain control circuit that generates a drive signal by controlling an amplification factor (gain) based on the monitor signal and supplies the drive signal to the vibrator; Since the signal conversion circuit has amplification means for amplifying the monitor signal at a predetermined amplification factor for a predetermined period after the power is turned on, the greatly amplified monitor signal is supplied to the vibrator as a drive signal to vibrate the vibrator.
- the start-up time from when the state is greatly changed until the inertial force can be detected after the power is turned on can be shortened.
- the automatic gain control circuit has a variable gain range of the variable gain amplification circuit (a gain variable range inherent in the VGA circuit). An automatic gain control circuit that can be used and has stable operation and high accuracy can be realized.
- FIG. 1 is a block diagram showing a configuration of a vibration type inertial force sensor according to an embodiment of the present invention.
- the vibration type inertial force sensor according to the embodiment of the present invention will be described below as being used as an angular velocity sensor that detects an angular velocity based on the inertial force.
- the vibration type inertial force sensor shown in FIG. 1 includes a vibrator 1 that detects an angular velocity (inertial force), an oscillation circuit unit 2 that supplies a drive signal to the vibrator 1, and a detection circuit unit 3 that detects the angular velocity of the vibrator 1. I have.
- the vibrator 1 is an electrostatic drive / capacitance detection type, and includes a vibrating body 11, a driving unit 12 for driving the vibrating body 11, and a monitor corresponding to the amplitude of the vibrating body 11 (vibration state of the vibrator 1).
- the monitor unit 13 feeds back a signal to the oscillation circuit unit 2, and the detection unit 14 outputs a detection signal based on the magnitude of the angular velocity of the vibrator 1 by detecting the vibration displacement due to the Coriolis force of the vibrating body 11.
- the vibrating body 11 is composed of a vibrating substrate made of a silicon material, a glass material, or the like.
- the oscillation circuit unit 2 functions as a closed-loop self-excited oscillation circuit using the resonator 1 as a resonance element, and includes a CV conversion circuit (signal conversion circuit) 21, a signal amplification circuit 22, a filter circuit 23, and an AGC circuit (automatic gain control circuit). ) 24.
- the oscillation circuit unit 2 is connected to the drive unit 12 and the monitor unit 13 of the vibrator 1, and the monitor signal is fed back from the monitor unit 13 to the CV conversion circuit 21.
- the monitor signal fed back from the monitor means 13 is a monitor signal based on the electrostatic capacity corresponding to the amplitude of the vibrating body 11. Therefore, the CV conversion circuit 21 converts the monitor signal based on the capacitance corresponding to the magnitude of the amplitude of the vibrating body 11 into a monitor signal based on the voltage corresponding to the change amount of the capacitance.
- the signal amplification circuit 22 amplifies the monitor signal converted by the CV conversion circuit 21 with a predetermined amplification factor (gain), and the filter circuit 23 removes the predetermined signal from the monitor signal amplified by the signal amplification circuit 22.
- the AGC circuit 24 controls the amplification factor (gain) based on the monitor signal input from the filter circuit 23 so that the amplitude of the monitor signal is constant, and drives the vibrator 1 with the monitor signal amplified with the controlled amplification factor.
- the signal is supplied to the driving means 12 as a signal.
- the detection circuit unit 3 includes a detection circuit 31, a signal processing circuit 32, and a signal adjustment circuit 33.
- the detection circuit 31 converts the detection signal input from the detection means 14 of the vibrator 1 into a detection signal based on a voltage corresponding to the vibration displacement caused by the Coriolis force of the vibrating body 11 and outputs the detection signal.
- the signal processing circuit 32 performs signal processing such as extracting an angular velocity signal corresponding to the magnitude of the angular velocity from the detection signal input from the detection circuit 31.
- the signal adjustment circuit 33 adjusts the phase of the detection signal signal-processed by the signal processing circuit 32 and outputs it as an angular velocity detection signal.
- FIG. 2 is a block diagram showing a configuration of the AGC circuit 24 of the vibration type inertial force sensor according to the embodiment of the present invention.
- the AGC circuit 24 includes a rectifier circuit 241, a comparison / smoothing circuit 242, and a VGA circuit (variable gain amplifier circuit) 243.
- the rectifier circuit 241 rectifies the monitor signal input from the filter circuit 23, converts it into a RECT voltage (voltage of the monitor signal) that is a DC voltage, and outputs it.
- the comparison / smoothing circuit 242 compares the RECT voltage output from the rectifier circuit 241 with the reference voltage (VCTRL voltage) corresponding to the reference amplitude of the vibrator 1, and determines the amplification factor of the VGA circuit 243 based on the comparison result.
- a control signal (AGCO signal) to be controlled is output.
- the comparison / smoothing circuit 242 smoothes and outputs the AGCO signal as necessary.
- the RECT voltage corresponds to the amplitude of the vibrator 1 when the monitoring means 13 of the vibrator 1 outputs the monitor signal. Therefore, the control error ⁇ V in the amplitude of the vibrator 1 can be expressed by (Expression 1).
- RECT indicates the voltage of the monitor signal (RECT voltage)
- VCTRL indicates the reference voltage (VCTRL voltage).
- ⁇ V is a negative value.
- the control error ⁇ V has the relationship shown in (Equation 2) with the AGCO signal.
- AGCO represents a control signal (AGCO signal)
- Gctrl (> 0) represents an amplification factor of the control signal
- VDD represents a drive voltage of the AGC circuit 24.
- the monitor signal is amplified by the VGA circuit 243.
- the monitor signal amplified by the VGA circuit 243 is supplied to the drive means 12 as a drive signal.
- the drive unit 12 drives the vibrator 1 based on the drive signal, whereby the amplitude of the vibrating body 11 becomes constant.
- the vibration type inertial force sensor can detect the angular velocity of the vibrator 1 by amplifying the monitor signal by the VGA circuit 243 until the amplitude of the vibrating body 11 becomes a predetermined magnitude after the power is turned on. It is in a state. Therefore, the startup time of the vibration type inertial force sensor can be shortened by increasing the amplification factor of the VGA circuit 243.
- the amplification factor of the VGA circuit 243 is finite. Therefore, in the vibration type inertial force sensor according to the embodiment of the present invention, the CV conversion circuit 21 in the previous stage of the AGC circuit 24 including the VGA circuit 243 is provided with amplification means for amplifying the monitor signal, and the amplification factor of the VGA circuit 243 is obtained. By supplementing, start-up time is shortened.
- FIG. 3 is a circuit diagram showing a configuration of the CV conversion circuit 21 of the vibration type inertial force sensor according to the embodiment of the present invention.
- the CV conversion circuit 21 includes an operational amplifier 211 to which a feedback capacitor C1 and a feedback resistor R1 connected in parallel to the feedback capacitor C1 are connected.
- the operational amplifier 211 receives the monitor signal (input signal) output from the monitoring unit 13 at the negative input terminal, the reference voltage VREF at the positive input terminal, and outputs the converted monitor signal (output signal) from the output terminal. .
- the CV conversion circuit 21 includes a feedback capacitor C2 having a capacitance value smaller than the feedback capacitor C1, and a changeover switch 212 for switching between the feedback capacitor C1 and the feedback capacitor C2, as amplification means 21a for amplifying the monitor signal. .
- the CV conversion circuit 21 in which the feedback capacitor C1 has a capacitance value of about 2.0 pF and the feedback resistor R1 has a resistance value of about 280 M ⁇ has a cutoff frequency of about 280 Hz, and the drive frequency ( About 15 kHz) is sufficiently high.
- the drive frequency of the CV conversion circuit 21 is sufficiently higher than the cutoff frequency, the amplification factor of the CV conversion circuit 21 is inversely proportional to the capacitance value of the feedback capacitance. Therefore, the gain of the CV conversion circuit 21 is increased by switching to the feedback capacitor C2 whose capacitance value is smaller than the feedback capacitor C1 using the changeover switch 212.
- the capacitance value of the feedback capacitor C2 is set to about 0.5 pF, which is a quarter of the capacitance value of the feedback capacitor C1
- the amplification factor of the CV conversion circuit 21 increases about four times.
- the monitor signal converted by the CV conversion circuit 21 is amplified by switching to the feedback capacitor C2 using the changeover switch 212 at the time of turning on the power source of the vibration type inertial force sensor according to the embodiment of the present invention. (For example, about 4 times), the signal is output to the AGC circuit 24 through the signal amplification circuit 22 and the filter circuit 23.
- the RECT voltage (monitor signal voltage) output from the rectifier circuit 241 also increases. Since the AGCO signal output from the comparison / smoothing circuit 242 can be obtained from (Expression 1) and (Expression 2), the voltage level increases according to the RECT voltage output from the rectifier circuit 241.
- the monitor signal is amplified by the CV conversion circuit 21, the voltage level of the AGCO signal is in a level range where the gain based on the AGCO signal in the AGC circuit 24 is less than or equal to the maximum gain of the amplification factor of the VGA circuit 243.
- the amplification factor of the VGA circuit 243 has a negative characteristic with respect to the control signal
- the case where the amplification factor of the VGA circuit 243 has a positive characteristic with respect to the control signal may be considered depending on the circuit design.
- the voltage level of the AGCO signal is in a level range where the gain based on the AGCO signal in the AGC circuit 24 is equal to or greater than the maximum gain of the amplification factor of the VGA circuit 243.
- the VGA circuit 243 converts the monitor signal input to the VGA circuit 243 to the VGA circuit 243.
- the VGA circuit of the circuit 243 amplifies the signal with substantially the maximum gain in the variable gain range inherent in the VGA circuit, and supplies the amplified signal to the driving means 12 as a driving signal. For this reason, the VGA circuit 243 amplifies the monitor signal amplified by the CV conversion circuit 21 at a substantially maximum gain within the variable gain range inherent in the VGA circuit of the VGA circuit 243.
- the drive signal is set to be larger than that in the case of not amplifying, and the time from when the power is turned on until the amplitude of the vibrating body 11 becomes a predetermined magnitude is shortened, and the start-up time can be shortened.
- the CV conversion circuit 21 amplifies the monitor signal by switching the feedback capacitors C1 and C2, the circuit configuration can be saved as compared with the case where the monitor signal is amplified by switching the resistance.
- FIG. 4 is an exemplary diagram showing a timing chart of switching of the feedback capacitors C1 and C2 of the CV conversion circuit 21 of the vibration type inertial force sensor 21 according to the embodiment of the present invention, the amplification factor of the amplification means 21a, and the AGCO signal.
- the CV conversion circuit 21 when the power is turned on, the CV conversion circuit 21 is connected to the feedback capacitor C2 using the changeover switch 212, and the amplification factor of the amplifying means 21a is about four times that when connected to the feedback capacitor C1. .
- the voltage level of the AGCO signal is less than the maximum gain of the amplification factor of the VGA circuit 243 when the power is turned on. It exists in the level range that becomes.
- the monitor signal amplified by the CV conversion circuit 21 and the VGA circuit 243 is supplied as a drive signal to the drive means 12 of the vibrator 1, and the drive means 12 is driven by the vibrator based on the supplied drive signal. 1, and a monitor signal corresponding to the vibration state of the vibrator 1 is fed back from the monitor unit 13 to the CV conversion circuit 21 and the VGA circuit 243.
- the driving of the vibrator 1 approaches a steady state, and the voltage level of the AGCO signal is outside the level range where the gain based on the AGCO signal is less than the maximum gain of the amplification factor of the VGA circuit 243. It will be.
- the CV conversion circuit 21 uses the changeover switch 212 to switch from the feedback capacitor C2.
- the connection is switched to the feedback capacitor C1. This can prevent the gain of the AGC circuit 24 from becoming small. That is, the AGCO signal at the time of startup can be set large within a range where the amplification factor of the VGA circuit 243 does not decrease, and the gain of the oscillation circuit unit 2 as a whole can be increased.
- the amplification factor of the amplifying unit 21a is about 1/4 times that when the feedback capacitor C2 is connected.
- the feedback of the monitor signal is repeated, whereby the drive of the vibrator 1 approaches a steady state, and the voltage level of the AGCO signal becomes a gain based on the AGCO signal. From the level range in which the gain is less than the maximum gain, the steady drive range is reached. When the voltage level of the AGCO signal reaches the steady drive range, the vibration type inertial force sensor can detect the angular velocity of the vibrator 1 and the activation is completed. Note that the activation time in FIG. 4 refers to the period from when the power is turned on until the activation is completed.
- the vibration-type inertial force sensor includes the vibrator 1, the oscillation circuit unit 2, and the detection circuit unit 3, and the oscillation circuit unit 2 resonates the vibrator 1. It functions as a closed-loop self-oscillation circuit as an element.
- the oscillation circuit unit 2 includes a CV conversion circuit 21 that converts a monitor signal based on capacitance according to the vibration state of the vibrator 1 into a monitor signal based on a voltage corresponding to the amount of change in capacitance, and a CV conversion circuit.
- an AGC circuit 24 that generates a drive signal by controlling an amplification factor (gain) so that the amplitude of the monitor signal converted in 21 becomes constant, and supplies the drive signal to the vibrator 1.
- the CV conversion circuit 21 Since the CV conversion circuit 21 has amplification means 21a that amplifies the monitor signal at a predetermined amplification rate for a predetermined period after the power is turned on, the greatly amplified monitor signal is used as a drive signal to the drive means 12 of the vibrator 1. It is possible to greatly change the vibration state of the vibrator 1 by supplying the power and to shorten the startup time from when the power is turned on until the angular velocity of the vibrator 1 can be detected. Further, since the starting time of the vibration type inertial force sensor is shortened by using the amplifying means 21a of the CV conversion circuit 21, the AGC circuit 24 can be used in the variable gain range of the VGA circuit 243, and the operation is stable. A highly accurate AGC circuit can be realized.
- the AGCO signal does not change the amplification factor (gain of the AGC circuit 24) of the VGA circuit 243 even if the AGCO signal changes after the power is turned on.
- the CV conversion circuit 21 is connected to the feedback capacitor C2 to Has increased.
- the vibration-type inertial force sensor according to the embodiment of the present invention is switched when the voltage level of the AGCO signal is outside the level range where the gain based on the AGCO signal is less than or equal to the maximum gain of the gain of the VGA circuit 243.
- the CV conversion circuit 21 switches the connection from the feedback capacitor C2 to the feedback capacitor C1 using the changeover switch 212. That is, the CV conversion circuit 21 switches the connection from the feedback capacitor C2 to the feedback capacitor C1 based on the AGCO signal.
- the CV conversion circuit 21 is connected from the feedback capacitor C2 to the feedback capacitor C1.
- the AGCO signal at the time of start-up can be set large within a range where the amplification factor of the VGA circuit 243 does not decrease, and the gain of the oscillation circuit unit 2 as a whole also increases.
- the starting time until the angular velocity of the child 1 can be detected can be shortened.
- the voltage level of the AGCO signal when the power is turned on is such that the gain based on the AGCO signal has the maximum amplification factor of the VGA circuit 243.
- the voltage level of the AGCO signal is Is in a level range where the gain based on the above is greater than or equal to the maximum gain of the amplification factor of the VGA circuit 243.
- FIG. 5 is a circuit diagram showing another configuration of the CV conversion circuit 21 of the vibration type inertial force sensor according to the embodiment of the present invention.
- the CV conversion circuit 21 shown in FIG. 5 includes a feedback capacitor C1 that is always connected to the operational amplifier 211, a feedback capacitor C2 that is connected in parallel to the feedback capacitor C1, an amplification unit 21a that amplifies the monitor signal, a feedback capacitor C2, and an operational amplifier. And a changeover switch 212 for switching the size of the feedback capacity by switching between connection and non-connection with 211. Therefore, the CV conversion circuit 21 shown in FIG. 5 has a configuration in which the feedback capacitor C1 and the operational amplifier 211 are always connected even when the changeover switch 212 fails and the feedback capacitor C2 and the operational amplifier 211 cannot be connected.
- the CV conversion circuit 21 having a fail-safe configuration that does not lead to a fatal failure can be realized.
- the feedback capacitor C2 is not limited to a configuration in which one capacitor is connected in parallel to the feedback capacitor C1, but may be a configuration in which a plurality of capacitors are connected in parallel to the feedback capacitor C1.
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Abstract
Description
2 発振回路部
3 検出回路部
11 振動体
12 駆動手段
13 モニタ手段
14 検出手段
21 CV変換回路(信号変換回路)
21a 増幅手段
22 信号増幅回路
23 フィルタ回路
24 AGC回路(自動利得制御回路)
31 検出回路
32 信号処理回路
33 信号調整回路
211 オペアンプ
212 切り替えスイッチ
241 整流回路
242 比較・平滑化回路
243 VGA回路(可変利得増幅回路)
Claims (6)
- 慣性力を検出する振動子と、
該振動子に駆動信号を供給する発振回路部と、
前記振動子の慣性力を検出する検出回路部と
を備え、
前記発振回路部は、前記振動子を共振素子とした閉ループの自励発振回路として機能し、
前記振動子の振動状態に応じた静電容量に基づくモニタ信号を、静電容量の変化量に対応した電圧に基づくモニタ信号に変換する信号変換回路と、
該信号変換回路で変換したモニタ信号に基づき利得を制御して前記駆動信号を生成し、該駆動信号を前記振動子に供給する自動利得制御回路とを有し、
前記信号変換回路は、電源を投入してから所定の期間、所定の増幅率でモニタ信号を増幅する増幅手段を有することを特徴とする振動型慣性力センサ。 - 前記信号変換回路は、フィードバック容量を有するオペアンプ回路で構成され、前記増幅手段は、電源を投入してから前記所定の期間、前記フィードバック容量の大きさを切り替えることでモニタ信号を増幅することを特徴とする請求項1に記載の振動型慣性力センサ。
- 前記所定の期間は、前記自動利得制御回路が有する増幅回路の増幅率が前記自動利得制御回路の利得を制御するコントロール信号に対して負の特性を有する場合、電源を投入してから、前記コントロール信号の変化に対して前記利得が変化する範囲において、前記コントロール信号に基づく前記利得が前記増幅回路の増幅率の最大利得以下になる期間であることを特徴とする請求項1又は2に記載の振動型慣性力センサ。
- 前記所定の期間は、前記自動利得制御回路が有する増幅回路の増幅率が前記自動利得制御回路の利得を制御するコントロール信号に対して正の特性を有する場合、電源を投入してから、前記コントロール信号の変化に対して前記利得が変化する範囲において、前記コントロール信号に基づく前記利得が前記増幅回路の増幅率の最大利得以上になる期間であることを特徴とする請求項1又は2に記載の振動型慣性力センサ。
- 前記増幅手段は、前記自動利得制御回路の利得を制御するコントロール信号に基づいて、前記フィードバック容量の大きさを切り替えることを特徴とする請求項2乃至4のいずれか一項に記載の振動型慣性力センサ。
- 前記フィードバック容量は、第1フィードバック容量と、第2フィードバック容量とを備え、
前記第1フィードバック容量は、前記オペアンプ回路に常時接続されている容量で、
前記第2フィードバック容量は、前記コントロール信号に基づいて、前記オペアンプ回路に接続される少なくとも一つの容量であることを特徴とする請求項5に記載の振動型慣性力センサ。
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CN201080063609.3A CN102753937B (zh) | 2010-02-17 | 2010-12-28 | 振动型惯性力传感器 |
DE112010005045T DE112010005045T5 (de) | 2010-02-17 | 2010-12-28 | Oszillationstyp-Trägheitskraftsensor |
JP2012500476A JP5362097B2 (ja) | 2010-02-17 | 2010-12-28 | 振動型慣性力センサ |
US13/569,207 US9021879B2 (en) | 2010-02-17 | 2012-08-08 | Oscillation type inertia force sensor |
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US13/569,207 Continuation US9021879B2 (en) | 2010-02-17 | 2012-08-08 | Oscillation type inertia force sensor |
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JP (1) | JP5362097B2 (ja) |
CN (1) | CN102753937B (ja) |
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KR101319712B1 (ko) * | 2011-12-26 | 2013-10-17 | 삼성전기주식회사 | 자이로센서 구동회로, 자이로센서 시스템 및 자이로센서 구동 방법 |
JP6429199B2 (ja) * | 2015-05-29 | 2018-11-28 | 日立オートモティブシステムズ株式会社 | 慣性センサ |
JP6274460B2 (ja) * | 2016-07-27 | 2018-02-07 | セイコーエプソン株式会社 | 駆動回路、集積回路装置及びセンサー装置 |
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- 2010-12-28 DE DE112010005045T patent/DE112010005045T5/de not_active Withdrawn
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CN102753937B (zh) | 2016-03-02 |
DE112010005045T5 (de) | 2012-10-25 |
US20130192366A1 (en) | 2013-08-01 |
JP5362097B2 (ja) | 2013-12-11 |
US9021879B2 (en) | 2015-05-05 |
CN102753937A (zh) | 2012-10-24 |
JPWO2011102063A1 (ja) | 2013-06-17 |
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