WO2015128922A1 - 容量式物理量検出装置 - Google Patents
容量式物理量検出装置 Download PDFInfo
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- WO2015128922A1 WO2015128922A1 PCT/JP2014/006450 JP2014006450W WO2015128922A1 WO 2015128922 A1 WO2015128922 A1 WO 2015128922A1 JP 2014006450 W JP2014006450 W JP 2014006450W WO 2015128922 A1 WO2015128922 A1 WO 2015128922A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/125—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by capacitive pick-up
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
Definitions
- This disclosure relates to a capacitive physical quantity detection device that detects physical quantities such as acceleration, angular velocity, and pressure.
- FIG. 4 is a schematic diagram of a conventional capacitive physical quantity detection device 100.
- the conventional capacitive physical quantity detection device 100 includes a movable electrode 102 that is displaced according to acceleration, and a fixed electrode 103 that is disposed to face the movable electrode 102.
- the capacitive physical quantity detection device 100 detects acceleration by detecting displacement of the movable electrode 102 caused by acceleration as a change in capacitance between the movable electrode 102 and the fixed electrode 103. That is, the movable electrode 102 is displaced by the electrostatic force generation means 104.
- the capacitance detection unit 105 detects a change in capacitance between the movable electrode 102 and the fixed electrode 103 caused by this displacement.
- the capacitance detection unit 105 determines whether or not the change in capacitance exceeds a predetermined threshold value, thereby determining whether or not the movable electrode is operating normally and disconnecting the signal path to the capacitance detection unit. Failure diagnosis is performed to determine whether or not As prior art document information related to this application, for example, Patent Document 1 is known.
- the capacitive physical quantity detection device includes a sensor unit, a control circuit, and a CV conversion circuit.
- the sensor unit has a movable electrode, a first fixed electrode, and a second fixed electrode.
- the movable electrode is displaced according to a change in physical quantity.
- the 1st fixed electrode is arrange
- the second fixed electrode is disposed to face the second portion of the movable electrode.
- the control circuit inputs signals between the movable electrode and the first fixed electrode and between the movable electrode and the second fixed electrode.
- the CV conversion circuit receives a reference voltage and outputs a voltage corresponding to a change in capacitance between the movable electrode and the first fixed electrode and between the movable electrode and the second fixed electrode.
- the control circuit inputs a first signal to the first fixed electrode, inputs a second signal having an opposite phase to the first signal to the second fixed electrode, In this period, the reference voltage is input to the first fixed electrode, and the second signal is input to the second fixed electrode.
- FIG. 1 is a perspective view of a sensor portion of the acceleration sensor according to the present embodiment.
- FIG. 2 is a circuit diagram of the acceleration sensor according to the present embodiment.
- FIG. 3 is a diagram illustrating the relationship between the signal waveform of the carrier wave of the acceleration sensor and the opening / closing timing of the switch according to the present embodiment.
- FIG. 4 is a schematic diagram of a conventional capacitive physical quantity detection device.
- the conventional capacitive physical quantity detection device 100 displaces the movable electrode 102 during failure diagnosis, it may take time for failure diagnosis. For example, when the signal path to the capacitance detection unit 105 is disconnected, if a failure diagnosis is performed without displacing the movable electrode 102, the signal detected by the capacitance detection unit is zero. However, this is indistinguishable from the case where the input physical quantity is zero when the signal path is normal, so that a failure cannot be detected.
- FIG. 1 is a perspective view of the sensor unit 1 of the acceleration sensor 30 according to the present embodiment.
- FIG. 2 is a circuit diagram of the acceleration sensor 30 in the present embodiment.
- the capacitive physical quantity detection device includes a sensor unit 1, a control circuit 24, and a CV conversion circuit 21.
- the sensor unit 1 includes a movable electrode 2c, a first fixed electrode 3a, and a second fixed electrode 3b.
- the movable electrode 2c is displaced according to a change in physical quantity.
- the 1st fixed electrode 3a is arrange
- the second fixed electrode 3b is disposed to face the second portion of the movable electrode 2c.
- the control circuit 24 inputs signals between the movable electrode 2c and the first fixed electrode 3a and between the movable electrode 2c and the second fixed electrode 3b.
- the CV conversion circuit 21 receives a reference voltage and outputs a voltage corresponding to a change in capacitance between the movable electrode 2c and the first fixed electrode 3a and between the movable electrode 2c and the second fixed electrode 3b. .
- control circuit 24 inputs the first signal P1 to the first fixed electrode 3a and the second signal P2 having the opposite phase to the first signal to the second fixed electrode 3b.
- the reference voltage is input to the first fixed electrode 3a and the second signal P2 is input to the second fixed electrode 3b.
- the sensor unit 1 includes an acceleration sensor element 2, an upper lid 3, and a lower lid 4.
- the acceleration sensor element 2 is sandwiched between the upper lid 3 and the lower lid 4.
- the acceleration sensor element 2 includes a beam 2a, a beam 2b, a movable electrode 2c, and a frame portion 2d.
- a fixed electrode 3 a (first fixed electrode) and a fixed electrode 3 b (second fixed electrode) are formed on the upper lid 3.
- the fixed electrode 3a is disposed to face the first portion of the movable electrode 2c.
- the fixed electrode 3b is disposed so as to face the second portion of the movable electrode 2c.
- the movable electrode 2c and the fixed electrode 3a, and the movable electrode 2c and the fixed electrode 3b each constitute a capacitance.
- the capacitance thereof changes in accordance with the displacement of the movable electrode 2c.
- the detection circuit 20 to be described later detects acceleration based on a change in differential capacitance between the movable electrode 2c and the fixed electrode 3a and between the movable electrode 2c and the fixed electrode 3b.
- the acceleration sensor 30 has a sensor unit 1 and a detection circuit 20.
- the detection circuit 20 includes a CV conversion circuit 21, a signal processing circuit 22, a control circuit 24, and a determination circuit 25.
- the control circuit 24 is a signal applying unit that periodically applies a signal between the movable electrode 2c and the fixed electrodes 3a and 3b.
- the CV conversion circuit 21 includes an amplifier 21a, a capacitor 21b, and a switch 21c.
- the CV conversion circuit 21 converts a change in differential capacitance between the movable electrode 2c and the fixed electrodes 3a and 3b into a voltage.
- An inverting input terminal (first input terminal) of the amplifier 21a is connected to the movable electrode 2c.
- a capacitor 21b and a switch 21c are connected between the inverting input terminal and the output terminal of the amplifier 21a.
- the capacitor 21b and the switch 21c are connected in parallel with each other.
- the reference voltage V0 is input to the non-inverting input terminal (second input terminal) of the amplifier 21a.
- the reference voltage V0 is set to 0V for simplification.
- the signal processing circuit 22 includes a sample and hold circuit 22a, an amplifier circuit 22b, and a low-pass filter 22c.
- the sample hold circuit 22a samples (measures) the output voltage of the CV conversion circuit 21 and holds it for a certain period.
- the amplifier circuit 22b amplifies the output voltage of the sample hold circuit 22a to a predetermined sensitivity.
- the low-pass filter 22c extracts only a component in a predetermined frequency band from the output voltage of the amplifier circuit 22b, and outputs an acceleration detection signal.
- the control circuit 24 generates and outputs carrier signals P1 and P2 and switch signals S1 and S2 based on the reference clock CLK and the failure diagnosis signal T, respectively.
- the carrier wave signal P1 (first signal) is a signal with an amplitude of ⁇ V input to the fixed electrode 3a.
- the carrier signal P2 (second signal) is a signal with an amplitude of ⁇ V input to the fixed electrode 3b.
- the switch signal S1 is a signal for opening and closing the switch 21c.
- the switch signal S2 is a signal for opening and closing the switch 221b.
- the switches 21c and 221b are constituted by semiconductor switches or the like, and are closed when the switch signal from the control circuit 24 is at a high level.
- FIG. 3 is a diagram showing the relationship between the signal waveform of the carrier wave of the acceleration sensor 30 and the switch opening / closing timing in the present embodiment.
- P1 indicates a carrier wave signal P1 input to the fixed electrode 3a.
- P2 indicates a carrier wave signal P2 input to the fixed electrode 3b.
- Reference numeral 21c indicates the opening / closing timing of the switch 21c.
- Reference numeral 221b indicates the opening / closing timing of the switch 221b.
- the change in capacity according to the input physical quantity is measured (normal operation). Then, in the second period T3, T4, it is determined whether or not the signal path to the capacity detection means is disconnected (failure diagnosis operation). Thereby, failure diagnosis can be performed without displacing the movable electrode, and the time for failure diagnosis is shortened.
- the carrier signal P1 and the carrier signal P2 are output from the control circuit 24.
- the carrier signal P1 is a rectangular wave signal having a constant amplitude in which the high level (+ V) and the low level ( ⁇ V) change in the first periods T1 and T2.
- the carrier signal P2 is a signal whose voltage level is inverted with respect to the carrier signal P1 in the first periods T1 and T2.
- P1 represents a voltage signal applied to the fixed electrode 3a
- P2 represents a voltage signal applied to the fixed electrode 3b.
- the carrier signal P1 is + V and the carrier signal P2 is -V.
- the switch signals S1 and S2 from the control circuit 24 cause the switch 21c to be closed (HIGH) and the switch 221b to be open (LOW).
- the voltage V0 is applied to the non-inverting input terminal of the amplifier 21a, the voltage V0 is applied to the movable electrode 2c, and the charge in the capacitor 21b is discharged.
- the switches 23a and 23b are not connected to the reference voltage V0, but are connected so as to input the carrier waves P1 and P2 to the movable electrode 2c.
- This voltage is sampled and held by the sample and hold circuit 22a and output as an acceleration detection signal through the amplifier circuit 22b and the low-pass filter 22c. That is, the sample hold circuit 22a samples (measures) the output voltage of the amplifier 21a in the period T2, and holds the sampled voltage in other periods. Then, an acceleration detection signal is output through the amplifier circuit 22b and the low-pass filter 22c by the output voltage from the sample hold circuit 22a.
- the output voltage of the CV conversion circuit 21 is ⁇ C2 ⁇ 2V / Cf.
- the output of the CV conversion circuit 21 is zero. Therefore, by determining whether or not the output voltage of the CV conversion circuit 21 exceeds a predetermined threshold by the determination circuit 25, it can be determined whether or not the signal path is disconnected. Further, according to this configuration, even when the acceleration applied to the sensor unit 1 is zero, C2 does not become zero, so that the output voltage ( ⁇ C2 ⁇ 2V / Cf) of the CV conversion circuit 21 at normal time is disconnected. The output voltage (zero) of the CV conversion circuit 21 at the time can be determined.
- the sample hold circuit 22a holds the voltage sampled (measured) at T2 in the first period. Therefore, fluctuations in the output voltage of the CV conversion circuit 21 during the failure diagnosis operation do not affect the measured acceleration value output from the acceleration sensor 30.
- Fault diagnosis is performed by setting the sampling period of the sample hold circuit 22a or the data update period of the output of the acceleration sensor 30 to be longer than the combined period of the first period T1, T2 and the second period T3, T4. An acceleration detection signal can be obtained without interrupting the acceleration detection operation during the operation. That is, no extra time is required for failure diagnosis.
- the capacity type physical quantity detection device of the present disclosure performs a normal operation of measuring a change in capacity according to the input physical quantity in the first period T1 and T2.
- a failure diagnosis operation is performed to determine whether or not the signal path to the capacity detection unit is disconnected. Thereby, failure diagnosis can be performed without displacing the movable electrode, and the time for failure diagnosis can be shortened.
- the capacitive physical quantity detection device of the present disclosure is useful as an acceleration sensor for vehicle control.
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- General Physics & Mathematics (AREA)
- Pressure Sensors (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
以下、本開示の容量式物理量検出装置の一例である加速度センサについて図面を参照しながら説明する。
2 加速度センサ素子
2a,2b 梁
2c 可動電極
2d 枠部
3 上蓋
3a,3b 固定電極
4 下蓋
20 検出回路
21 CV変換回路
21a 増幅器
21b コンデンサ
21c,221b,23a,23b スイッチ
22 信号処理回路
22a サンプルホールド回路
22b 増幅回路
22c ローパスフィルタ
24 制御回路
25 判定回路
30 加速度センサ
100 容量式物理量検出装置
102 可動電極
103 固定電極
104 静電気力発生手段
105 容量検出手段
Claims (7)
- 物理量の変化に応じて変位する可動電極と、
前記可動電極の第1の箇所に対向して配置された第1の固定電極と、
前記可動電極の第2の箇所に対向して配置された第2の固定電極と、
を有するセンサ部と、
前記可動電極と前記第1の固定電極との間および、前記可動電極と前記第2の固定電極との間に信号を入力する制御回路と、
基準電圧が入力され、前記可動電極と前記第1の固定電極との間および、前記可動電極と前記第2の固定電極との間の容量の変化に応じた電圧を出力するCV変換回路と、
を備え、
前記制御回路は、
第1の期間において、前記第1の固定電極に第1の信号を入力するとともに、前記第2の固定電極に前記第1の信号とは逆位相の第2の信号を入力し、
第2の期間において、前記第1の固定電極に、前記基準電圧を入力するとともに、前記第2の固定電極に前記第2の信号を入力する
容量式物理量検出装置。 - 前記CV変換回路は増幅器を有し、
前記増幅器の第1の入力端子は、前記可動電極に接続されている
請求項1に記載の容量式物理量検出装置。 - 前記増幅器の第2の入力端子に、前記基準電圧が入力される
請求項2に記載の容量式物理量検出装置。 - 前記CV変換回路に接続されたサンプルホールド回路を更に備え、
前記サンプルホールド回路のサンプリング周期は、前記第1の期間と前記第2の期間とを合わせた期間よりも長い
請求項1に記載の容量式物理量検出装置。 - 前記容量式物理量検出装置は、前記第1の期間と前記第2の期間とを合わせた期間よりも長いデータ更新周期を有する
請求項1に記載の容量式物理量検出装置。 - 前記増幅器の前記第1の入力端子と出力端子との間に接続され、互いに並列に接続されたスイッチとコンデンサとをさらに有する
請求項1に記載の容量式物理量検出装置。 - 前記物理量は加速度である
請求項1に記載の容量式物理量検出装置。
Priority Applications (3)
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US15/114,777 US10088495B2 (en) | 2014-02-27 | 2014-12-25 | Capacitive physical quality detection device |
JP2016504872A JP6371984B2 (ja) | 2014-02-27 | 2014-12-25 | 容量式物理量検出装置 |
DE112014006428.9T DE112014006428T5 (de) | 2014-02-27 | 2014-12-25 | Kapazitive Vorrichtung zur Erfassung einer physikalischen Eigenschaft |
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JP2014036319 | 2014-02-27 | ||
JP2014-036319 | 2014-02-27 |
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WO2015128922A1 true WO2015128922A1 (ja) | 2015-09-03 |
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US (1) | US10088495B2 (ja) |
JP (1) | JP6371984B2 (ja) |
DE (1) | DE112014006428T5 (ja) |
WO (1) | WO2015128922A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3144640A1 (en) * | 2015-09-21 | 2017-03-22 | ams AG | Sensor arrangement and method for operation of a sensor |
US10534015B2 (en) | 2016-05-19 | 2020-01-14 | Panasonic intellectual property Management co., Ltd | Sensor and method for diagnosing sensor |
US10948311B2 (en) | 2017-10-25 | 2021-03-16 | Panasonic Intellectual Property Management Co., Ltd. | Electronic reliability enhancement of a physical quantity sensor |
US11802885B2 (en) | 2019-04-30 | 2023-10-31 | Panasonic Intellectual Property Management Co., Ltd. | Sensor processing system, sensor system, and sensor processing method |
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2014
- 2014-12-25 WO PCT/JP2014/006450 patent/WO2015128922A1/ja active Application Filing
- 2014-12-25 US US15/114,777 patent/US10088495B2/en active Active
- 2014-12-25 DE DE112014006428.9T patent/DE112014006428T5/de active Pending
- 2014-12-25 JP JP2016504872A patent/JP6371984B2/ja active Active
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JPH08211093A (ja) * | 1994-11-03 | 1996-08-20 | Robert Bosch Gmbh | 加速度センサの容量性信号を評価する回路装置 |
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Publication number | Priority date | Publication date | Assignee | Title |
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EP3144640A1 (en) * | 2015-09-21 | 2017-03-22 | ams AG | Sensor arrangement and method for operation of a sensor |
US10534015B2 (en) | 2016-05-19 | 2020-01-14 | Panasonic intellectual property Management co., Ltd | Sensor and method for diagnosing sensor |
US10921347B2 (en) | 2016-05-19 | 2021-02-16 | Panasonic Intellectual Property Management Co., Ltd. | Sensor and method for diagnosing sensor |
US10948311B2 (en) | 2017-10-25 | 2021-03-16 | Panasonic Intellectual Property Management Co., Ltd. | Electronic reliability enhancement of a physical quantity sensor |
US11802885B2 (en) | 2019-04-30 | 2023-10-31 | Panasonic Intellectual Property Management Co., Ltd. | Sensor processing system, sensor system, and sensor processing method |
Also Published As
Publication number | Publication date |
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DE112014006428T5 (de) | 2016-12-08 |
JPWO2015128922A1 (ja) | 2017-03-30 |
US10088495B2 (en) | 2018-10-02 |
US20160341760A1 (en) | 2016-11-24 |
JP6371984B2 (ja) | 2018-08-15 |
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