CN108089022B - Self-adaptive frequency-voltage conversion conditioning circuit - Google Patents
Self-adaptive frequency-voltage conversion conditioning circuit Download PDFInfo
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- CN108089022B CN108089022B CN201711095691.8A CN201711095691A CN108089022B CN 108089022 B CN108089022 B CN 108089022B CN 201711095691 A CN201711095691 A CN 201711095691A CN 108089022 B CN108089022 B CN 108089022B
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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
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
Abstract
The invention discloses a self-adaptive frequency-voltage conversion conditioning circuit, and belongs to the technical field of aviation electrical design. Because the output waveform of the magnetic pulse type rotation speed sensor is influenced by factors of mechanical installation size and permanent magnet materials, the output waveform is easy to distort, a spike is generated in an effective measurement period, the amplitude of the spike changes along with the change of the magnetic sensor and the current rotation speed, and the rotation speed measurement error easily causes misoperation of a control circuit, so that a starting system is released in advance or in a delayed manner, the system is difficult to start, and the system is failed to start in a serious case. The invention can effectively eliminate the false pulse signals in the output signals of the magnetic pulse type sensor and effectively improve the measurement precision of the rotating speed measurement, thereby improving the reliability and robustness of the aviation low-voltage direct current starting/generating system.
Description
Technical Field
The invention discloses a self-adaptive frequency-voltage conversion conditioning circuit, and belongs to the technical field of aviation electrical design.
Background
Because the output waveform of the magnetic pulse type rotation speed sensor is influenced by factors of mechanical installation size and permanent magnet materials, the output waveform is easy to distort, a spike is generated in an effective measurement period, the amplitude of the spike changes along with the difference of the magnetic sensor and the change of the current rotation speed, and the error in rotation speed measurement easily causes malfunction of a control circuit, so that a starting system is released in advance or in a delayed manner, the system is difficult to start, and the system is failed to start in serious cases.
Conventional conditioning circuits take the following form:
1) adding a filter; the spike frequency is the same as the output signal frequency of the magnetic pulse sensor, so that the noise signal is difficult to filter by adding a filter.
2) Increasing hysteresis; the amplitude of the spine changes along with the change of the rotating speed of the generator, the amplitude of the hysteresis voltage is set to be too high, and the output of the rotating speed measuring circuit is zero when the rotating speed is low; the amplitude of the hysteresis voltage is set to be too low, and after the rotating speed is increased, the amplitude of the spikes is increased, so that the noise signals cannot be effectively filtered.
Disclosure of Invention
The purpose of the invention is as follows: by analyzing the reason of error of the output rotating speed signal in the rotating speed measuring circuit adopting the magnetic pulse type rotating speed sensor, the reasonable signal conditioning circuit is adopted, the false pulse signal in the output distorted waveform of the sensor is effectively eliminated, the rotating speed measuring precision and the anti-interference capability of the starting/generating system of the aircraft engine are improved, and therefore the reliability and the robustness of the starting/generating system are improved.
The technical scheme of the invention is as follows:
a self-adaptive frequency-voltage conversion conditioning circuit comprises a pre-conditioning circuit 1, a variable return difference hysteresis comparison circuit 2, a frequency-voltage conversion circuit 3, a control circuit 4 and a proportional amplification circuit 5;
the pre-conditioning circuit 1 pre-filters the output signal of the sensor, filters high-frequency interference, and adjusts and limits the amplitude of the signal;
the variable return difference hysteresis comparison circuit 2 realizes the shaping of an output signal, converts the input signal into a square wave signal with stable amplitude, and simultaneously adjusts the hysteresis threshold of the comparison circuit according to an output feedback circuit, thereby effectively filtering an interference signal of the input signal;
the frequency-voltage conversion circuit 3 changes the input square wave signal and outputs a frequency proportional to the input signal; the control circuit 4 controls the state of the system according to the output of the frequency/voltage conversion circuit and other state variables of the system;
the proportional amplifying circuit 5 amplifies the output of the frequency/voltage conversion circuit, outputs a voltage signal proportional to the output of the frequency/voltage conversion circuit, and feeds the voltage signal to the variable return difference hysteresis comparison circuit 2 to realize the feedback of the output signal.
The circuit comprises an adaptive adjusting circuit, wherein the adaptive adjusting circuit comprises a resistor I R6, a resistor II R7, an integrated operational amplifier I U2D, an integrated analog multiplier I U5, one end of a slave frequency-voltage conversion circuit R13 is connected to U2D, one end of a slave frequency-voltage conversion circuit R3623 is connected to U5, one end of the slave frequency-voltage conversion circuit U1D is connected to U5, and the other end of the slave frequency-voltage conversion circuit U5 is connected to R4.
The invention has the advantages that: the invention can effectively eliminate the false pulse signals in the output signals of the magnetic pulse type sensor, effectively improve the measurement precision of the rotating speed measurement, expand the range of the rotating speed measurement and improve the reliability and robustness of the aviation low-voltage direct current starting/generating system.
Drawings
FIG. 1 is a schematic block diagram of the present invention
Detailed Description
A self-adaptive frequency-voltage conversion conditioning circuit comprises a pre-conditioning circuit 1, a variable return difference hysteresis comparison circuit 2, a frequency-voltage conversion circuit 3, a control circuit 4 and a proportional amplification circuit 5;
the pre-conditioning circuit 1 pre-filters the output signal of the sensor, filters high-frequency interference, and adjusts and limits the amplitude of the signal;
the variable return difference hysteresis comparison circuit 2 realizes the shaping of an output signal, converts the input signal into a square wave signal with stable amplitude, and simultaneously adjusts the hysteresis threshold of the comparison circuit according to an output feedback circuit, thereby effectively filtering an interference signal of the input signal;
the frequency-voltage conversion circuit 3 changes the input square wave signal and outputs a frequency proportional to the input signal; the control circuit 4 controls the state of the system according to the output of the frequency/voltage conversion circuit and other state variables of the system;
the proportional amplifying circuit 5 amplifies the output of the frequency/voltage conversion circuit, outputs a voltage signal proportional to the output of the frequency/voltage conversion circuit, and feeds the voltage signal to the variable return difference hysteresis comparison circuit 2 to realize the feedback of the output signal.
The circuit comprises an adaptive adjusting circuit, wherein the adaptive adjusting circuit comprises a resistor I R6, a resistor II R7, an integrated operational amplifier I U2D, an integrated analog multiplier I U5, one end of a slave frequency-voltage conversion circuit R13 is connected to U2D, one end of a slave frequency-voltage conversion circuit R3623 is connected to U5, one end of the slave frequency-voltage conversion circuit U1D is connected to U5, and the other end of the slave frequency-voltage conversion circuit U5 is connected to R4.
The present invention will be described in further detail with reference to the accompanying drawings.
The adaptive frequency-voltage conversion conditioning circuit comprises a preconditioning circuit 1, a change return difference hysteresis comparison circuit 2, a frequency-voltage conversion circuit 3, a control circuit 4 and a proportional amplification circuit 5;
the preconditioning circuit 1 mainly comprises a capacitor C1, a capacitor C2, a resistor R1 and a resistor R2, wherein a sensor output signal passes through a C1 DC blocking capacitor to filter a DC signal, and then passes through a low-pass filter circuit consisting of C2, R1 and R2 to perform pre-filtering, filter high-frequency interference and adjust and limit the amplitude of the signal.
The variable-return-difference hysteresis comparison circuit 2 mainly comprises a resistor R9, a resistor R10, an integrated operational amplifier U1D, an integrated analog multiplier U5 and a resistor R4, wherein the U5 analog multiplication circuit multiplies an output signal of an output feedback circuit by an output current of the variable-return-difference hysteresis comparison circuit, and then the output signal is fed back to the positive end of the comparison circuit through positive feedback to realize the adjustment of a hysteresis threshold, shapes the output signal, converts the output signal into a square wave signal with stable amplitude, and effectively filters an interference signal of an input signal.
The frequency-voltage conversion circuit 3 mainly comprises a resistor R11, a capacitor C3, a capacitor C4, a capacitor C14, an integrated operational amplifier U3A, a resistor R12 and a resistor R13, wherein a monostable circuit is formed by R11, C3 and U3A, an input square wave signal is converted into a pulse signal with a fixed width, a second-order filter circuit is formed by R12, R13, C4 and C14, and the pulse signal with the fixed width output by the monostable circuit is filtered to output a direct-current voltage value. The control circuit 4 mainly comprises a comparison circuit consisting of a resistor R14, a resistor R15 and an integrated operational amplifier U4D, when the rotating speed reaches a certain speed, the U4D outputs low level, and the system enters a power generation state.
The proportional amplifying circuit 5 mainly comprises a resistor R6, a resistor R7 and an integrated operational amplifier U4D, amplifies the output of the frequency/voltage conversion circuit, outputs a voltage signal proportional to the output of the frequency/voltage conversion circuit, and feeds back the voltage signal to the variable return difference hysteresis comparison circuit 2 to realize the feedback of the output signal.
Claims (1)
1. A self-adaptive frequency-voltage conversion conditioning circuit is characterized by comprising a pre-conditioning circuit (1), a variable return difference hysteresis comparison circuit (2), a frequency-voltage conversion circuit (3), a control circuit (4) and a proportional amplification circuit (5); the pre-conditioning circuit (1) pre-filters the output signal of the sensor, filters high-frequency interference, and regulates and limits the output amplitude of the signal;
the variable return difference hysteresis comparison circuit (2) shapes an output signal, converts the input signal into a square wave signal with stable amplitude, and adjusts a hysteresis threshold of the comparison circuit according to an output feedback circuit to effectively filter an interference signal of the input signal;
the frequency-voltage conversion circuit (3) changes the input square wave signal and outputs a voltage signal proportional to the frequency of the input signal;
the control circuit (4) controls the state of the system according to the output of the frequency-voltage conversion circuit and other state variables of the system;
the proportional amplification circuit (5) amplifies the output of the frequency-voltage conversion circuit, outputs a voltage signal proportional to the output of the frequency-voltage conversion circuit, and gives the voltage signal to the variable return difference hysteresis comparison circuit (2) to realize the feedback of an output signal;
the variable return difference hysteresis comparison circuit (2) consists of a resistor R9, a resistor R10, an integrated operational amplifier U1D, an integrated analog multiplier U5 and a resistor R4, wherein the integrated analog multiplier U5 multiplies an output signal of an output feedback circuit by an output voltage of the variable return difference hysteresis comparison circuit, and then feeds the multiplied output signal back to the positive end of the comparison circuit through positive feedback to realize the adjustment of a hysteresis threshold;
the frequency-voltage conversion circuit (3) consists of a resistor R11, a capacitor C3, a capacitor C4, a capacitor C14, an integrated operational amplifier U3A, a resistor R12 and a resistor R13, wherein a monostable circuit consists of R11, C2 and U3A, an input square wave signal is converted into a pulse signal with a fixed width, a second-order filter circuit consists of R12, R13, C4 and C14, the pulse signal with the fixed width output by the monostable circuit is filtered, and a direct-current voltage value is output;
the control circuit (4) is a comparison circuit consisting of a resistor R14, a resistor R15 and an integrated operational amplifier U4D, when the rotating speed reaches a certain speed, the U4D outputs low level, and the system enters a power generation state;
the adaptive frequency-voltage conversion conditioning circuit further comprises an adaptive adjusting circuit, wherein the adaptive adjusting circuit comprises a resistor I R6, a resistor II R7 and an integrated operational amplifier I U2D, the integrated analog multiplier I U5 is connected to U2D from one end of the frequency-voltage conversion circuit R13, is connected to U5 through U2D, is connected to U5 through U1D, and is connected to the other end of R4 through U5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711095691.8A CN108089022B (en) | 2017-11-08 | 2017-11-08 | Self-adaptive frequency-voltage conversion conditioning circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711095691.8A CN108089022B (en) | 2017-11-08 | 2017-11-08 | Self-adaptive frequency-voltage conversion conditioning circuit |
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| CN108089022A CN108089022A (en) | 2018-05-29 |
| CN108089022B true CN108089022B (en) | 2021-07-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109188077A (en) * | 2018-09-10 | 2019-01-11 | 杭州和利时自动化有限公司 | A kind of signal frequency measuring method, system, device and readable storage medium storing program for executing |
| CN110470857B (en) * | 2019-09-08 | 2021-04-13 | 陕西航空电气有限责任公司 | Rotating speed detection method suitable for aviation power system generator |
| CN110988382A (en) * | 2019-12-24 | 2020-04-10 | 北京金迈捷科技有限公司 | Rotating speed frequency signal processing device and method and rotating speed measuring system |
| CN112803842A (en) * | 2020-12-25 | 2021-05-14 | 珠海格力电器股份有限公司 | Pulse frequency processing method, circuit, device, storage medium and processor |
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|---|---|---|---|---|
| CN101324633A (en) * | 2008-07-25 | 2008-12-17 | 清华大学 | Rotary speed sensor with bus interface for automobile |
| CN203299222U (en) * | 2013-06-14 | 2013-11-20 | 深圳市东仪电子有限公司 | An automobile magnetoelectric wheel speed sensor signal processing circuit |
| CN104330583A (en) * | 2014-10-28 | 2015-02-04 | 陕西千山航空电子有限责任公司 | Aircraft engine rotating speed signal acquisition circuit |
| CN105675904A (en) * | 2016-03-31 | 2016-06-15 | 中国重汽集团济南动力有限公司 | Vehicle speed sensor signal processing circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005091073A (en) * | 2003-09-16 | 2005-04-07 | Nsk Ltd | Rotation speed detector and load measuring instrument for roller bearing unit |
| US8922144B2 (en) * | 2012-06-25 | 2014-12-30 | Chrysler Group Llc | Method of processing sensor signals for determining motion of a motor shaft |
| CN103618522A (en) * | 2013-11-26 | 2014-03-05 | 苏州贝克微电子有限公司 | Self-adaptation threshold value circuit of comparator |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101324633A (en) * | 2008-07-25 | 2008-12-17 | 清华大学 | Rotary speed sensor with bus interface for automobile |
| CN203299222U (en) * | 2013-06-14 | 2013-11-20 | 深圳市东仪电子有限公司 | An automobile magnetoelectric wheel speed sensor signal processing circuit |
| CN104330583A (en) * | 2014-10-28 | 2015-02-04 | 陕西千山航空电子有限责任公司 | Aircraft engine rotating speed signal acquisition circuit |
| CN105675904A (en) * | 2016-03-31 | 2016-06-15 | 中国重汽集团济南动力有限公司 | Vehicle speed sensor signal processing circuit |
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