CN107843279B - Sensor circuit with self-detection fault and self-regulation functions - Google Patents

Sensor circuit with self-detection fault and self-regulation functions Download PDF

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Publication number
CN107843279B
CN107843279B CN201711063334.3A CN201711063334A CN107843279B CN 107843279 B CN107843279 B CN 107843279B CN 201711063334 A CN201711063334 A CN 201711063334A CN 107843279 B CN107843279 B CN 107843279B
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circuit
sensor
fault
self
signal
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CN107843279A (en
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陈浩
倪大成
郑华雄
任浩
郭庆丰
王文武
胡冬青
王辰玥
王臻
李敏
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Ningbo CRRC Times Transducer Technology Co Ltd
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Ningbo CRRC Times Transducer Technology Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D18/00Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00

Abstract

The invention relates to a sensor circuit with self-detecting fault and self-adjusting functions, which comprises a signal processing circuit for processing a detection signal of a sensor, a fault prompting circuit for detecting the fault of the detection signal of the sensor and prompting the fault, and a fault adjusting circuit for detecting the fault of the signal of the sensor and adjusting the detection signal of the sensor to a normal state, wherein the fault prompting circuit is connected with the output end of the signal processing circuit, and the fault adjusting circuit is connected with the output end of the signal processing circuit. The sensor circuit with the self-detection fault and self-regulation function can not only detect the abnormal information of the sensor, but also feed back partial abnormal information, so that the sensor is restored to a normal working state, and the sensor circuit has a certain effect of enhancing the anti-interference capability of the sensor. The sensor can actively feed back the abnormal information, is very helpful for tracing the source and root of the abnormal condition of the system product, and is convenient and quick to find the fault reason.

Description

Sensor circuit with self-detection fault and self-regulation functions
Technical Field
The invention relates to the technical field of sensors, in particular to a sensor circuit with self-fault detection and self-regulation functions.
Background
Sensors are widely used in various fields as a signal detection device, and faults occurring during the operation of the sensors are generally passively detected by a system. For example, chinese patent application No. CN101110569A (application No. 200710137102.8) discloses an abnormality detection circuit, which monitors a power supply voltage (Vcc) and outputs an abnormality detection signal (Sabn) of a predetermined level when the power supply voltage (Vcc) drops. A source of a detection transistor (M10) which is a P-channel MOSFET is connected to a power supply line (Lvcc) to which a power supply voltage (Vcc) to be monitored is applied. A detection resistor (R10) as an impedance element is provided between the drain of the detection transistor (M10) and the ground terminal (GND). The capacitor (C10) is provided between the gate of the detection transistor (M10) and the ground terminal (GND). A charging path (12) is provided between the gate of the detection transistor (M10) and the power supply line (Lvcc). An abnormality detection circuit (10) outputs the drain voltage of a detection transistor (M10) as an abnormality detection signal (Sabn). The abnormity detection circuit can only realize the abnormal detection and needs to be adjusted by other means, and if the abnormity detection circuit is used in a sensor, the anti-interference capability of the corresponding sensor is poor.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a sensor circuit with self-detecting failure and self-adjusting functions, which can not only detect an anomaly, but also perform feedback processing on a part of the anomaly to restore the anomaly to a normal use state, thereby effectively improving the anti-interference capability of the sensor.
The technical scheme adopted by the invention for solving the problems is as follows: a sensor circuit with self-detecting fault and self-adjusting functions, characterized in that: comprises that
The signal processing circuit is used for processing the detection signal of the sensor;
the fault prompting circuit is connected with the output end of the signal processing circuit and is used for detecting the fault of the detection signal of the sensor and prompting the fault;
and the fault adjusting circuit is connected with the output end of the signal processing circuit and is used for detecting the fault of the sensor signal and adjusting the sensor detection signal to a normal state.
The fault prompting circuit is characterized in that a first field effect tube is adopted, a grid electrode of the first field effect tube is connected with an output end of the signal processing circuit, a source electrode of the first field effect tube is grounded, and a drain electrode of the first field effect tube is connected with a direct-current power supply.
In order to prompt the fault state conveniently, an indicator lamp is connected between the drain electrode of the first field effect transistor and the direct current power supply.
Preferably, the first field effect transistor is an N-channel MOSFET transistor.
As an improvement, the fault adjusting circuit includes a PI regulator, a hysteresis comparator and a second field effect transistor, a positive phase input terminal of the PI regulator is connected to a detection signal output terminal of the sensor, an output terminal of the PI regulator is connected to a positive phase input terminal of the hysteresis comparator, an inverted phase input terminal of the hysteresis comparator is grounded, an output terminal of the hysteresis comparator is connected to a drain electrode of the second field effect transistor, a gate of the second field effect transistor is connected to an output terminal of the signal processing circuit, and a source of the second field effect transistor is connected to the inverted phase input terminal of the PI regulator.
Preferably, the second field effect transistor adopts a JFET transistor with an N channel.
As an improvement, the signal processing circuit includes a signal demodulator for processing a detection signal of the sensor into a square wave signal, a waveform conversion circuit for converting a signal output by the signal demodulator into a sawtooth wave, and a rectification filter circuit for performing rectification filter processing on an output signal of the waveform conversion circuit, an input end of the waveform conversion circuit is connected with an output end of the signal demodulator, an input end of the rectification filter circuit is connected with an output end of the waveform conversion circuit, and an output end of the rectification filter circuit is respectively connected with input ends of the fault prompt circuit and the fault adjustment circuit.
Compared with the prior art, the invention has the advantages that: the sensor circuit with the self-detection fault and self-regulation function can not only detect the abnormal information of the sensor, but also feed back partial abnormal information, so that the sensor is restored to a normal working state, and the sensor circuit has a certain effect of enhancing the anti-interference capability of the sensor. The sensor can actively feed back abnormal information, is very helpful for tracing the source and root of the abnormal condition of a system product, and can conveniently and quickly find the fault reason.
Drawings
FIG. 1 is a circuit diagram of a sensor circuit with self-detecting fault and self-adjusting functions according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1, the sensor circuit with self-detection and self-regulation functions in this embodiment includes a signal processing circuit 1, a fault indication circuit 2, and a fault regulation circuit 3.
When detecting a relevant signal, the sensor usually processes the acquired primary side signal in its interior, for example, the primary side signal is amplified by a transformer and then output, in order to facilitate the transmission to the controller for processing.
The sensor circuit with the self-detection fault and self-regulation function in the embodiment can process the amplified signals to realize the detection of the signal faults of the sensor, and can also independently regulate partial small faults, so that the signal of the sensor is recovered to a normal state to improve the anti-interference capability of the sensor.
Wherein the signal processing circuit 1 is used for processing the detection signal of the sensor. The signal processing circuit 1 includes a signal demodulator 11 for processing an amplified detection signal of the sensor into a square wave signal, a waveform conversion circuit 12 for converting a signal output from the signal demodulator 11 into a sawtooth wave, and a rectification filter circuit 13 for performing rectification filter processing on an output signal of the waveform conversion circuit 12, wherein an input end of the waveform conversion circuit 12 is connected to an output end of the signal demodulator 11, and an input end of the rectification filter circuit 13 is connected to an output end of the waveform conversion circuit 12. The output of the rectifying and filtering circuit 13 is divided into two paths, that is, the output end of the rectifying and filtering circuit 13 is respectively connected with the input ends of the fault prompting circuit 2 and the fault adjusting circuit 3.
The failure prompt circuit 2 is used for detecting a failure of the sensor detection signal and prompting the failure. The fault indication circuit 2 adopts a first field effect transistor 21, and the first field effect transistor 21 adopts an N-channel MOSFET transistor. The grid of the first field effect transistor 21 is connected with the output end of the rectifying and filtering circuit 13, the source of the first field effect transistor 21 is grounded, the drain of the first field effect transistor 21 is connected with an indicator lamp 22, and the other end of the indicator lamp 22 is connected with a direct current power supply. In this embodiment, the indicator light 22 is an LED light, and whether there is an abnormal fault in the sensor signal can be determined by turning on and off the LED light.
The failure adjusting circuit 3 is for detecting a failure of the sensor signal and is capable of adjusting the sensor detection signal to a normal state. The fault regulating circuit 3 includes a PI regulator 31, a hysteresis comparator 32, and a second field effect transistor 33. Wherein the second field effect transistor 33 is an N-channel JFET transistor. The positive input terminal of the PI regulator 31 is connected to the detection signal output terminal of the sensor, and in this embodiment, a signal having the same proportion as the detection signal amplified by the sensor is transmitted to the positive input terminal of the PI regulator 31. The output end of the PI regulator 31 is connected to the positive input end of the hysteresis comparator 32, the negative input end of the hysteresis comparator 32 is grounded, the output end of the hysteresis comparator 32 is connected to the drain of the second field-effect transistor 33, the gate of the second field-effect transistor 33 is connected to the output end of the rectification filter circuit 13, and the source of the second field-effect transistor 33 is connected to the negative input end of the PI regulator 31.
When the detection signal of the sensor is normal, the first fet 21 is in the on state, and the indicator lamp 22 is in the on state. Meanwhile, the second fet 33 is in an off state, and the detection signal of the sensor is directly output through the PI regulator 31. In this embodiment, the first field effectVoltage U between gate and source of tube 21gsGreater than the turn-on voltage U of the first field effect transistor 21gs(th)When the current is applied, the first FET 21 is turned on, U in the present embodimentgs(th)1-3V. Voltage V between the gate and the source of the second field effect transistor 33gsLess than the pinch-off voltage V of the second FET 33gs(off)When so, the second fet 33 is turned off. In this example Vgs(off)-0.5 to-3.0V. If the detection signal of the sensor is abnormal, the square wave signal output by the signal demodulator 11 disappears or the frequency is increased. When the square wave signal disappears or the frequency is increased, the first field effect transistor 21 is turned off, the corresponding indicator lamp 22 is turned off, and if the abnormal condition of the sensor signal can be found by observing the state of the indicator lamp 22, the detection indication of the fault is realized.
If the square wave disappears, the gate voltage of the second field effect transistor 33 is 0V, and the source voltage of the second field effect transistor 33 is always 0.4V or-0.4V due to the divided voltage. In any case, V of the second FET 33gsAnd is always higher than-0.5V, the second fet 33 will be turned on. If the square wave frequency is increased, the frequency is increased due to the effect of the wave box conversion circuit, the amplitude of the sawtooth wave is reduced, and when the frequency reaches a certain degree, the V of the second field effect transistor 33 is reducedgsabove-0.5V, the second FET 33 is turned on. Assuming that the influence of the abnormality on the product is represented as positive deviation of the product (at this time, the voltages of the drain terminal and the source terminal of the second field effect transistor 33 are equal, since the output of the hysteresis comparator 32 is positive, the voltage of the inverting input terminal of the PI regulator 31 is greater than that of the non-inverting input terminal, the output of the PI regulator 31 is negative, the output OUT of the product is negative, and the influence generated by the abnormality is cancelled, the product gradually returns to normal, the second field effect transistor 33 is turned off, and meanwhile, since the voltage of the forward input terminal of the hysteresis comparator 32 is smaller than that of the inverting input terminal, the output of the hysteresis comparator 32 is turned over, and the hysteresis comparator 32 reaches another output state, namely, the output is negative. Similarly, if the effect of the anomaly on the product is reflected as a negative deviation, the adjustment process is similar to the previous process. Through the process, the method can realizeAnd autonomously adjusting part of the abnormity in the sensor signal so as to recover to a normal state.

Claims (6)

1. A sensor circuit with self-detecting fault and self-adjusting functions, characterized in that: comprises that
The signal processing circuit is used for processing the detection signal of the sensor;
the fault prompting circuit is connected with the output end of the signal processing circuit and is used for detecting the fault of the detection signal of the sensor and prompting the fault;
the fault adjusting circuit is connected with the output end of the signal processing circuit and is used for detecting the fault of the sensor signal and adjusting the sensor detection signal to a normal state;
the fault regulating circuit comprises a PI regulator, a hysteresis comparator and a second field effect transistor, wherein a positive phase input end of the PI regulator is connected with a detection signal output end of the sensor, an output end of the PI regulator is connected with a positive phase input end of the hysteresis comparator, an inverted phase input end of the hysteresis comparator is grounded, an output end of the hysteresis comparator is connected with a drain electrode of the second field effect transistor, a grid electrode of the second field effect transistor is connected with an output end of the signal processing circuit, and a source electrode of the second field effect transistor is connected with the inverted phase input end of the PI regulator.
2. The sensor circuit with self-detecting malfunction and self-regulating function according to claim 1, wherein: the fault prompting circuit adopts a first field effect transistor, the grid electrode of the first field effect transistor is connected with the output end of the signal processing circuit, the source electrode of the first field effect transistor is grounded, and the drain electrode of the first field effect transistor is connected with a direct-current power supply.
3. The sensor circuit with self-detecting malfunction and self-regulating function according to claim 2, wherein: and an indicator lamp is also connected between the drain electrode of the first field effect transistor and the direct-current power supply.
4. The sensor circuit with self-detecting malfunction and self-regulating function according to claim 2, wherein: the first field effect transistor is an N-channel MOSFET.
5. The sensor circuit with self-detecting malfunction and self-regulating function according to claim 1, wherein: the second field effect transistor adopts a JFET (junction field effect transistor) with an N-channel.
6. The sensor circuit with self-detecting malfunction and self-regulating function according to any one of claims 1 to 5, wherein: the signal processing circuit comprises a signal demodulator for processing a detection signal of the sensor into a square wave signal, a waveform conversion circuit for converting a signal output by the signal demodulator into a sawtooth wave, and a rectification filter circuit for performing rectification filter processing on an output signal of the waveform conversion circuit, wherein the input end of the waveform conversion circuit is connected with the output end of the signal demodulator, the input end of the rectification filter circuit is connected with the output end of the waveform conversion circuit, and the output end of the rectification filter circuit is respectively connected with the input ends of the fault prompt circuit and the fault regulation circuit.
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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1033880A (en) * 1987-12-07 1989-07-12 南加利福尼亚爱迪生公司 Fault detect
CN1470964A (en) * 2002-06-12 2004-01-28 欧姆龙株式会社 Anomaly detection method and apparatus, and temperature regulator
CN101339203A (en) * 2007-11-20 2009-01-07 北京金万安汽车电子技术研发有限公司 Automobile wheel speed sensor fault monitoring method
CN102003400A (en) * 2010-12-28 2011-04-06 易事特电力系统技术有限公司 Direct current fan speed regulation and fault sensing circuit
CN102829991A (en) * 2012-09-21 2012-12-19 三一重机有限公司 Fault detection system, fault detection method and module
CN204180367U (en) * 2014-09-30 2015-02-25 深圳市索佳能源科技有限公司 A kind of single lamp power saver with failure protection function
CN205123689U (en) * 2015-11-24 2016-03-30 中国航空工业集团公司北京航空精密机械研究所 Current mode linear power amplifier
CN105577053A (en) * 2016-02-01 2016-05-11 杨明 Trigger and generator voltage regulator
CN205721471U (en) * 2016-04-07 2016-11-23 浙江中控技术股份有限公司 A kind of electric current output system of band self-diagnostic function
CN205720529U (en) * 2016-06-30 2016-11-23 浙江百固电气科技股份有限公司 Intelligent lightning protecting fault detector

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1033880A (en) * 1987-12-07 1989-07-12 南加利福尼亚爱迪生公司 Fault detect
CN1470964A (en) * 2002-06-12 2004-01-28 欧姆龙株式会社 Anomaly detection method and apparatus, and temperature regulator
CN101339203A (en) * 2007-11-20 2009-01-07 北京金万安汽车电子技术研发有限公司 Automobile wheel speed sensor fault monitoring method
CN102003400A (en) * 2010-12-28 2011-04-06 易事特电力系统技术有限公司 Direct current fan speed regulation and fault sensing circuit
CN102829991A (en) * 2012-09-21 2012-12-19 三一重机有限公司 Fault detection system, fault detection method and module
CN204180367U (en) * 2014-09-30 2015-02-25 深圳市索佳能源科技有限公司 A kind of single lamp power saver with failure protection function
CN205123689U (en) * 2015-11-24 2016-03-30 中国航空工业集团公司北京航空精密机械研究所 Current mode linear power amplifier
CN105577053A (en) * 2016-02-01 2016-05-11 杨明 Trigger and generator voltage regulator
CN205721471U (en) * 2016-04-07 2016-11-23 浙江中控技术股份有限公司 A kind of electric current output system of band self-diagnostic function
CN205720529U (en) * 2016-06-30 2016-11-23 浙江百固电气科技股份有限公司 Intelligent lightning protecting fault detector

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