CN210514350U - Waveform conversion circuit for detecting rotating speed of aircraft engine - Google Patents
Waveform conversion circuit for detecting rotating speed of aircraft engine Download PDFInfo
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- CN210514350U CN210514350U CN201921329979.1U CN201921329979U CN210514350U CN 210514350 U CN210514350 U CN 210514350U CN 201921329979 U CN201921329979 U CN 201921329979U CN 210514350 U CN210514350 U CN 210514350U
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Abstract
The utility model discloses a waveform conversion circuit for detecting the rotating speed of an aircraft engine, which comprises a low-pass filter, an inverse hysteresis comparator, a negative reference comparator, a half-wave rectification and amplitude adjustment circuit, wherein an input rotating speed signal is firstly inhibited or attenuated by the low-pass filter; then the signal is converted into an inverted square wave signal through an inverted hysteresis comparator; then inverting through a negative reference comparator; and finally, converting the signal into a square wave signal meeting the requirements of a subsequent module through a half-wave rectification and amplitude adjustment circuit. The utility model discloses circuit structure is simple, the cost of construction is low, the debugging is convenient, the interference killing feature is strong, the reliability is high.
Description
Technical Field
The utility model relates to a waveform conversion circuit for aeroengine rotational speed detects belongs to electronic circuit technical field.
Background
The aircraft engine speed is a very important parameter for the aircraft, and is related to the safety of the flight. The engine speed is characterized by measuring the frequency quantity of the signals of the speed sensor, and the output signals from the speed sensor are signals containing interference noise, so that the signals must be filtered and shaped before being input into the digital acquisition module to ensure that the speed detection equipment of the aircraft engine can accurately measure the speed of the aircraft engine in real time.
Disclosure of Invention
The utility model aims at providing a waveform conversion circuit for aeroengine rotational speed detects can be under the condition of rotational speed sensor's output signal has the interference, convert alternating current rotational speed signal into the square wave signal unanimous with aeroengine rotational speed frequency to adjust square wave signal amplitude and satisfy the input requirement of rotational speed check out test set collection module, improve rotational speed check out test set's measurement accuracy.
The purpose of the utility model is realized by the following technical scheme.
A waveform conversion circuit for detecting the rotating speed of an aeroengine comprises a low-pass filter, an inverse hysteresis comparator, a negative reference comparator and a half-wave rectification and amplitude adjustment circuit, wherein an input rotating speed signal is subjected to suppression or attenuation high-frequency interference through the low-pass filter; then the signal is converted into an inverted square wave signal through an inverted hysteresis comparator; then inverting through a negative reference comparator; and finally, converting the signal into a square wave signal meeting the requirements of a subsequent module through a half-wave rectification and amplitude adjustment circuit.
Preferably, the low-pass filter comprises a resistor R1 and a capacitor C1;
the inverting hysteresis comparator comprises a resistor R2, a resistor R3 and a comparator U1A;
the negative reference comparator comprises a resistor R4, a resistor R5, a resistor R6 and a comparator U1B;
the half-wave rectification and amplitude adjustment circuit comprises a resistor R6, a resistor R7 and a rectifying diode V1;
the input end of the waveform conversion circuit is connected with the resistor R1 and the capacitor C1 in series and is grounded, and the inverting end of the comparator U1A and the common end of the resistor R1 and the capacitor C1 are connected; the output end of the comparator U1A is connected with the inverting end of the comparator U1B, the resistor R2 and the resistor R3 are connected in series and grounded, and the non-inverting end of the comparator U1A and the common end of the resistor R2 and the resistor R3 are connected; the 12V power supply series resistor R4 and the resistor R5 are grounded, and the non-inverting terminal of the comparator U1B and the common terminal of the resistor R4 and the resistor R5 are connected; the output end of the comparator U1B is connected with the anode of a rectifier diode V1, connected with a resistor R6 and connected with a +12V power supply, and the cathode of the rectifier diode V1 is connected with a resistor R7 and grounded and connected with the output end of the waveform conversion circuit to output square wave signals.
The beneficial effects of the utility model reside in that: the waveform conversion circuit has the characteristics of simple structure, low construction cost, convenience in debugging, strong anti-interference capability, high reliability and the like, has a good effect in practical application, and is also favorable for improving the testability, reliability and maintainability of airborne equipment.
Drawings
FIG. 1 is a schematic block diagram of a waveform conversion circuit for aircraft engine speed detection according to an exemplary embodiment;
FIG. 2 is a circuit diagram of a waveform conversion circuit for aircraft engine speed detection according to an embodiment;
fig. 3 is a waveform diagram of an input signal (Vin);
fig. 4 is a waveform diagram of the output signal (Vout).
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
A waveform conversion circuit for detecting the rotating speed of an aeroengine comprises a low-pass filter, an inverse hysteresis comparator, a negative reference comparator and a half-wave rectification and amplitude adjustment circuit, and the functional block diagram of the waveform conversion circuit is shown in figure 1.
The components of the waveform conversion circuit (see fig. 2) include a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a rectifier diode V1, a comparator U1A and a comparator U1B, wherein:
the low-pass filter comprises a resistor R1 and a capacitor C1;
the inverting hysteresis comparator comprises a resistor R2, a resistor R3 and a comparator U1A;
the negative reference comparator comprises a resistor R4, a resistor R5, a resistor R6 and a comparator U1B;
the half-wave rectification and amplitude adjustment circuit comprises a resistor R6, a resistor R7 and a rectifying diode V1.
The input end of the waveform conversion circuit is Vin, and the output end of the waveform conversion circuit is Vout.
An input end (Vin) of the waveform conversion circuit is connected with a resistor R1 and a capacitor C1 in series and grounded, and an inverting end (pin 2) of a comparator U1A and a resistor R1 are connected with a common end of the capacitor C1; the output end (pin 1) of the comparator U1A is connected with the inverting end (pin 6) of the comparator U1B, the resistor R2 and the resistor R3 are connected with the ground in series, and the non-inverting end (pin 3) of the comparator U1A and the resistor R2 are connected with the common end of the resistor R3; the 12V power supply series resistor R4 and the resistor R5 are grounded, and the non-inverting terminal (pin 5) of the comparator U1B and the common terminal of the resistor R4 and the resistor R5 are connected; the output end (pin 7) of the comparator U1B is connected with the anode of a rectifier diode V1, connected with a resistor R6 and connected with a +12V power supply, and the cathode of the rectifier diode V1 is connected with a resistor R7 and grounded and connected with the output end (Vout) of the waveform conversion circuit to output a square wave signal.
The specific working process is as follows:
an alternating current signal (shown in figure 3) output by the rotating speed sensor is connected to a waveform conversion circuit through an input end (Vin), and the signal firstly passes through a low-pass filter consisting of a resistor R1 and a capacitor C1 to inhibit or attenuate high-frequency interference in the rotating speed signal; then, an inverting hysteresis comparator composed of a comparator U1A, a resistor R2 and a resistor R3 is used to convert the ac signal input from the input terminal (Vin) into an inverted square wave signal (Vao). Because the threshold voltage Va + generates two levels along with the size jump of the signal (Vao), and the level size can be properly adjusted by changing the resistance values of the resistor R2 and the resistor R3, the anti-interference capability is improved; the negative reference comparator, which is composed of the comparator U1B, the resistor R4, the resistor R5 and the resistor R6, performs phase inversion, so that the signal (Vbo) is in phase with the alternating current signal input from the input end (Vin). The threshold voltage Vb + can be adjusted by changing the resistance values of the resistor R4 and the resistor R5; finally, a half-wave rectification and amplitude voltage regulation circuit consisting of a resistor R6, a rectifying diode V1 and a resistor R7 is adopted, and a square wave signal is output at the output end (Vout) of the waveform conversion circuit, wherein the waveform is shown in figure 4. The rectifier diode V1 is used for half-wave rectification, and the resistor R6 and the resistor R7 are used for adjusting the amplitude (Vo +) of the output square wave signal, so that the output signal meets the requirements of the digital acquisition module.
Claims (2)
1. A waveform conversion circuit for detecting the rotating speed of an aeroengine comprises a low-pass filter, an inverse hysteresis comparator, a negative reference comparator and a half-wave rectification and amplitude adjustment circuit, and is characterized in that an input rotating speed signal is firstly inhibited or attenuated by the low-pass filter; then the signal is converted into an inverted square wave signal through an inverted hysteresis comparator; then inverting through a negative reference comparator; and finally, converting the signal into a square wave signal meeting the requirements of a subsequent module through a half-wave rectification and amplitude adjustment circuit.
2. The waveform conversion circuit for aircraft engine speed detection according to claim 1, wherein:
the low-pass filter comprises a resistor R1 and a capacitor C1;
the inverting hysteresis comparator comprises a resistor R2, a resistor R3 and a comparator U1A;
the negative reference comparator comprises a resistor R4, a resistor R5, a resistor R6 and a comparator U1B;
the half-wave rectification and amplitude adjustment circuit comprises a resistor R6, a resistor R7 and a rectifying diode V1;
the input end of the waveform conversion circuit is connected with the resistor R1 and the capacitor C1 in series and is grounded, and the inverting end of the comparator U1A and the common end of the resistor R1 and the capacitor C1 are connected; the output end of the comparator U1A is connected with the inverting end of the comparator U1B, the resistor R2 and the resistor R3 are connected in series and grounded, and the non-inverting end of the comparator U1A and the common end of the resistor R2 and the resistor R3 are connected; the 12V power supply series resistor R4 and the resistor R5 are grounded, and the non-inverting terminal of the comparator U1B and the common terminal of the resistor R4 and the resistor R5 are connected; the output end of the comparator U1B is connected with the anode of a rectifier diode V1, connected with a resistor R6 and connected with a +12V power supply, and the cathode of the rectifier diode V1 is connected with a resistor R7 and grounded and connected with the output end of the waveform conversion circuit to output square wave signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921329979.1U CN210514350U (en) | 2019-08-15 | 2019-08-15 | Waveform conversion circuit for detecting rotating speed of aircraft engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921329979.1U CN210514350U (en) | 2019-08-15 | 2019-08-15 | Waveform conversion circuit for detecting rotating speed of aircraft engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213513A (en) * | 2020-09-23 | 2021-01-12 | 陕西法士特齿轮有限责任公司 | Transmission rotating speed measuring device with specific filtering function and measuring distance adjusting function |
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2019
- 2019-08-15 CN CN201921329979.1U patent/CN210514350U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213513A (en) * | 2020-09-23 | 2021-01-12 | 陕西法士特齿轮有限责任公司 | Transmission rotating speed measuring device with specific filtering function and measuring distance adjusting function |
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